ASSEMBLY, IN PARTICULAR REFRIGERATION MACHINE OR HEAT PUMP

Abstract

An assembly may comprise a first heat reservoir acting as a heat source, a second heat reservoir acting as a heat sink, a thermochemical reactor including an adsorption refrigerator or an adsorption heat pump that can be connected or is connected thermally and fluidically to the heat reservoirs, a heat transfer fluid circuit in which a heat transfer fluid is provided for transporting heat between the two heat reservoirs and the thermochemical reactor, and a temporary heat store that is provided in the heat transfer fluid circuit for temporarily storing the heat transfer fluid. The temporary heat store may be designed to receive the heat transfer fluid at two different temperature levels. The temporary heat store may include a first sub-store with a variable store volume and that is thermally and fluidically separate from a second sub-store with a variable store volume. A valve system may be present in the heat transfer fluid circuit.

Claims

1. An assembly of a refrigeration machine or heat pump, comprising: a first heat reservoir configured as heat source and with a second heat reservoir configured as heat sync, a thermochemical reactor configured to be thermally and fluidically connected to the heat reservoir including an adsorption refrigeration machine or adsorption heat pump, a heat transfer fluid circuit, in which a heat transfer fluid for the transport of heat between the two heat reservoirs and the thermochemical reactor is arranged, a temporary heat store arranged in the heat transfer fluid circuit for temporarily storing the heat transfer fluid, wherein the temporary heat store is configured for receiving and outputting temperature-layered heat transfer fluid masses and comprises a first sub-store with variable storage volume and that is thermally and fluidically separated from a second sub-store with variable storage volume, a delivery device that is present in the heat transfer fluid circuit for driving the heat transfer fluid in the heat transfer fluid circuit, with a valve system that is present in the heat transfer fluid circuit, wherein the valve system comprises: an adjustable first valve device, by which a fluid inlet of the thermochemical reactor can be optionally connected to the fluid outlet of the first or second heat reservoir, an adjustable second valve device, by which a fluid outlet of the thermochemical store can be optionally connected to the fluid inlet of the first or second heat reservoir, an adjustable third valve device, by which the first sub-store can be optionally connected via the first heat reservoir or directly to the first valve device, an adjustable fourth valve device, by which the second sub-store can be optionally connected via the second heat reservoir or directly to the first valve device, and a control/regulating device, which is equipped for controlling at least two of the valve devices of the valve system.

2. The assembly according to claim 1, wherein the temporary heat store is fluidically connected in parallel with the second valve device, so that the fluid inlet of the first heat reservoir fluidically communicates with the first sub-store and the fluid inlet of the second heat reservoir fluidically communicates with the second sub-store.

3. The assembly according to claim 1, wherein at least one of the first valve device, the second valve device, the third valve device, and the fourth valve device comprises a 3/2-way changeover valve.

4. The assembly according to claim 3, wherein the 3/2-way changeover valve is designed as self-switching valve.

5. The assembly according to claim 1, wherein the temporary heat store is designed for the simultaneous receiving and outputting of a first and of a second fluid mass of the heat transfer fluid, and wherein the two fluid masses have different temperature layers between the temperature levels.

6. The assembly according to claim 1, wherein the volume-variable first sub-store is designed complementarily to the volume-variable second sub-store, so that the total volume formed by the two sub-stores is constant.

7. The assembly according to claim 1, wherein the temporary heat store is designed as a vessel, wherein the vessel comprises: a housing, in the interior of which a separating element is moveably arranged, which subdivides the interior into a volume-variable first sub-store and a likewise volume-variable second sub-store that is thermally insulated from the first sub-store, a first passage that is present in the housing for introducing and discharging a heat transfer fluid with a first temperature layering in the or from the first sub-store respectively, a second passage that is present in the housing for introducing and discharging the heat transfer fluid with a second temperature layering into or from the second sub-store respectively, wherein the volume-variable first sub-store is designed complementarily to the volume-variable second sub-store, so that the total volume formed by the two sub-stores is constant.

8. The assembly according to claim 7, wherein the housing is designed elongated, and wherein the first passage is arranged at a first longitudinal end and the second passage at a second longitudinal end that is located opposite the first longitudinal end.

9. The assembly according to claim 7, wherein the housing is designed as tubular body, which extends along an axial direction (A) substantially in a straight line, and wherein the separating element for forming the two volume-variable sub-stores moveably lies against the inside of a circumferential wall of the tubular body along an axial direction.

10. The assembly according to claim 7, wherein at least one of: on the first passage a first sensor element is provided, by which it can be determined if the separating element is located in a first end position, in which the separating element is located at a minimum distance from the first passage (108a), and on the second passage a second sensor element is provided, by which it can be determined if the separating element is located in a second end position, in which the separating element is located at a minimum distance from the second passage.

11. The assembly according to claim 1, wherein, in the adjustable valve devices of the valve system, an operating state is adjustable by the control/regulating device, in which the heat transfer fluid circuit forms a first part circuit, and in which the heat transfer fluid circulates between the thermochemical reactor and the second heat reservoir, so that heat is transferred from the thermochemical reactor into the second heat reservoir.

12. The assembly according to claim 9, wherein, in this operating state, the first valve device and the second valve device each fluidically connect the second heat reservoir to the thermochemical reactor.

13. The assembly according to claim 1, wherein, in the at least one adjustable valve device of the valve system, an operating state is adjustable by the control/regulating device in which the heat transfer fluid circuit forms a second part circuit, in which the heat transfer fluid (F) circulates between the thermochemical reactor and the first heat reservoir, so that heat is transferred from the first heat reservoir into the thermochemical reactor.

14. The assembly according to claim 1, wherein, in this operating state, the first valve device and the second valve device each fluidically connect the first heat reservoir to the thermochemical reactor.

15. The assembly according to claim 1, wherein, in the adjustable valve devices of the valve system, an operating state is adjustable by the control/regulating device, wherein: heat transfer fluid is transported from the first sub-store into the thermochemical reactor, and heat transfer fluid is transported from the thermochemical reactor into the second sub-store.

16. The assembly according to claim 1, wherein, in this operating state: the first valve device and the third valve device fluidically connect the thermochemical reactor thereby bypassing the first heat reservoir directly to the first sub-store, the second and the fourth valve device fluidically connect the thermochemical reactor to the second sub-store.

17. The assembly according to claim 1, wherein, in the at least one adjustable device of the valve system, an operating state is adjustable by the control/regulating device wherein: heat transfer fluid bypassing the second heat reservoir is transported into the thermochemical reactor, heat transfer fluid is transported from the thermochemical reactor into the first sub-store.

18. The assembly according to claim 1, wherein, in this operating state: the first valve device and the third valve device fluidically connect the thermochemical store bypassing the second heat reservoir directly to the second sub-store, the second valve device and the fourth valve device fluidically connect the thermochemical store directly to the first sub-store, the first valve device and the fourth valve device fluidically connect the thermochemical reactor bypassing the second heat reservoir directly to the second sub-store, the second and the third valve device fluidically connect the thermochemical reactor to the first sub-store.

19. An assembly comprising: a first heat reservoir configured as heat source and with a second heat reservoir configured as heat sync; a thermochemical reactor configured to be thermally and fluidically connected to the heat reservoir including an adsorption refrigeration machine or adsorption heat pump; a heat transfer fluid circuit including a heat transfer fluid and configured to transport heat between the two heat reservoirs and the thermochemical reactor; a temporary heat store arranged in the heat transfer fluid circuit for temporarily storing the heat transfer fluid, wherein the temporary heat store is configured for receiving and outputting temperature-layered heat transfer fluid masses, and comprises a first sub-store with variable storage volume and that is thermally and fluidically separated from a second sub-store with variable storage volume.

19. The assembly according to claim 1, further comprising: a delivery device as part of the heat transfer fluid circuit and configured for driving the heat transfer fluid in the heat transfer fluid circuit; and a valve system as part of the heat transfer fluid circuit, the valve system including: an adjustable first valve device, by which a fluid inlet of the thermochemical reactor can be optionally connected to the fluid outlet of the first or second heat reservoir, an adjustable second valve device, by which a fluid outlet of the thermochemical store can be optionally connected to the fluid inlet of the first or second heat reservoir, an adjustable third valve device, by which the first sub-store can be optionally connected via the first heat reservoir or directly to the first valve device, an adjustable fourth valve device, by which the second sub-store can be optionally connected via the second heat reservoir or directly to the first valve device, and a control/regulating device, which is equipped for controlling at least two of the valve devices of the valve system.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0043] It shows, in each case schematically

[0044] FIGS. 1 to 4 an assembly according to the invention in different operating states,

[0045] FIG. 5 the construction of the temporary heat store that is substantial for the invention of the assembly of the FIGS. 1 to 4 in a detail representation,

[0046] FIG. 6 a first version of the temporary heat store of FIG. 5,

[0047] FIG. 7 a second version of the temporary heat store of FIG. 5.

DETAILED DESCRIPTION

[0048] FIG. 1 shows an example of an assembly 1 according to the invention, in particular of a refrigeration machine or of a heat pump. The assembly 1 comprises a first heat reservoir 2a with a first temperature T.sub.1 and a second heat reservoir 2b with a second temperature T.sub.2. The assembly 1, furthermore, comprises a thermochemical reactor 5, which can be or is thermally and fluidically connected to the two heat reservoirs 2a, 2b. For this purpose, the assembly 1 comprises a heat transfer fluid circuit 3, in which a heat transfer fluid F for transporting heat between the two heat reservoirs 2a, 2b and the thermochemical reactor 5 is arranged.

[0049] The term thermochemical reactor here is to mean a device in which conversion processes are made to take place by supplying and discharging heatknown to the person skilled in the art as reaction heat, sorption heats or phase change heatat different temperatures T.sub.1, T.sub.2. The thermochemical reactor 5 can comprise a vessel 15 only shown schematically in the figures, in which thermochemical reactions take place, with a heat transfer structure for supplying and discharging the reaction heats. The first temperature T.sub.1 has a greater value than the second temperature T.sub.2, i.e. the first heat reservoir 2a functions as heat source, from which by means of the heat transfer fluid F heat can be transferred to the thermochemical reactor 5. The second heat reservoir 2b by contrast functions as heat sync, to which by means of the heat transfer fluid F heat from the thermochemical reactor 5 can be transferred.

[0050] Furthermore, a temporary heat store 100 for temporarily storing the heat transfer fluid F is present in the heat transfer fluid circuit 3. The temporary heat store 100 makes possible a temperature change of the thermochemical reactor 5 from the temperature T.sub.1 to the temperature T.sub.2 and vice versa with very minor energy losses.

[0051] The construction of the temporary heat store 100 is shown in FIG. 5 in a schematic detail representation. According to FIG. 5, the temporary heat store 100 comprises a first sub-store 101a with a variable storage volume 102a and, thermally and fluidically separated from the same, a second sub-store 101b with variable storage volume 102b. The volume-variable first sub-store 101a of the temporary heat store 100 is designed complementarily to the volume-variable second sub-store 101b, so that the total volume formed by the two sub-stores 101a, 101b is always constant.

[0052] The temporary heat store 100 can also be referred to as sensible short-term heat store, regenerator or temperature changer and represents a component of the assembly 1 that is substantial for the invention, which makes possible a temperature change in the thermochemical reactor 5 with low energy losses in the first place.

[0053] The temporary heat store 100 is designed for the simultaneous receiving and outputting of a first and a second fluid mass of the heat transfer fluid F with differently layered temperature profile. Furthermore, the temporary heat store 100 is designed for the simultaneous receiving and outputting of the first and second fluid mass of the heat transfer fluid F, wherein the two fluid masses have different temperature layers, which in terms of quality are marked with different shades of grey. The darker the shade of grey, the higher is the temperature level that is present locally.

[0054] The function principle of the temporary heat store 100 is based on a thermally insulated fluid vessel with end-side openings and large length/cross-section ratio within which an insulated shiftable separating body 106 is arranged, as is schematically shown in FIG. 5.

[0055] In the exemplary scenario of FIG. 5, the temporary heat store 100 is realised as vessel 103. This vessel 103 comprises a housing 104. The housing 104 delimits an interior 107, in which a separating element 106 is moveably arranged, which thermally and fluidically insulates the two sub-stores 101a, 101b from one another. The separating element 106 subdivides the interior 107 into a volume-variable first sub-store 101a and a likewise volume-variable second sub-store 101b that is thermally and fluidically insulated from the first sub-store 101a. Advantageously, the housing wall 104 of the temporary heat store 100 is designed so that said housing wall 104 only has a small thermal mass and is embodied insulated towards the surroundings.

[0056] As is evident from the figures, the thermochemical reactor 5 and the temporary heat store 100 each have separate vessels 15 and 103 respectively.

[0057] As is evident from FIG. 5, a first passage 108a for introducing and discharging the heat transfer fluid F with the temperature T.sub.1 into the first sub-store 101a and from the first sub-store 101a is present in the housing 104. Furthermore, a second passage 108b for introducing and discharging the heat transfer fluid F with the temperature T.sub.2 into the second sub-store 101b or from the second sub-store 101b is present in the housing 104.

[0058] The housing 104 is designed as a tubular body 105 which extends in a straight line along an axial direction A. For forming the two volume-variable sub-stores 101a, 101b the separating element 106 moveably lies against the inside 112 of a circumferential wall 111 of the tubular body 105 along the axial direction A. The first passage 108a is arranged on as first longitudinal end 109a. The second passage 108b is arranged on a second longitudinal end 109b located opposite the first longitudinal end 109a.

[0059] On the first passage of the temporary heat store a first sensor element 110a is provided, by means of which it can be determined if the separating element 106 is located in a first end position, in which it is located at a minimum distance from the first passage 108a. Analogously, a second sensor element 110b is provided on the second passage 108b, by means of which it can be determined if the separating element 106 is located in a second end position, in which it is located at a minimum distance from the second passage 108b.

[0060] As illustrated in FIG. 3, the temporary heat store 100, with the separating element 106 arranged on the very left, i.e. on the first passage 108a, can be filled with a temperature-layered liquid column of the heat transfer fluid F, wherein the temperature level that is present at the separating element approximately corresponds to the temperature T.sub.2 and the temperature level that is present at the outlet 108b reaches closely to the temperature T.sub.1. By way of heat transfer fluid F of the temperature T.sub.1 that is initially hot but becoming ever cooler flowing in from the left via the first passage 108a, the separating element 106 can be shifted to the right, towards the second passage 108b, as a result of which the temporary heat store 100 is filled with a temperature-layered liquid column of the heat transfer fluid F, wherein the temperature level that is present at the separating element approximately corresponds to the temperature T.sub.1 and the temperature level that is present at the outlet 108a almost reaches up to the temperature T.sub.2. At the same time, the liquid column that is layered from the temperature T.sub.1 to the temperature T.sub.2 can be expelled through the second passage 108b to the right until the separating element 106 is located at the second passage 108b and the temperature-layered liquid column of the heat transfer fluid F has been completely exchanged.

[0061] Temperature profiles of the liquid columns of the heat transfer fluid F stored in the sub-stores of the temporary heat store bring about that during an expulsion of the temperature-layered liquid column from the second sub-store heat transfer fluid that is initially warm but becomes ever cooler is expelled. Thus, this sub-store can serve for the sliding cooling of a thermochemical reactor 5 as is evident from FIG. 4.

[0062] Complementarily thereto, initially cool heat transfer fluid that however becomes ever warmer is expelled from the first sub-store during an expulsion of the temperature-layered liquid column. Thus, this sub-store can serve for the sliding heating of a thermochemical reactor 5 as is evident from FIG. 2.

[0063] Again looking at FIG. 1 it is evident that in the heat transfer fluid circuit 4 a delivery device 8 for driving the heat transfer fluid F is provided.

[0064] Furthermore, a valve system 9 is present in the heat transfer fluid circuit 3, which comprises four adjustable valve devices, namely a first adjustable valve device 10a, a second adjustable valve device 10b, a third adjustable valve device 10c and a fourth adjustable device 10d. By means of the four valve devices 10a, 10b, 10c, 10d, heat transport between the two heat reservoirs 2a, 2b, the thermochemical reactor 5 and the temporary heat store 100 can be adjusted and consequently controlled. For controlling the valve devices 10a, 10b of the valve system 9, a control/regulating device 4 is provided which interacts with the valve devices 10a, 10b.

[0065] The first and the second heat reservoir 2a, 2b as well as the thermochemical reactor 5 each have a fluid inlet 11a, 11b, 11c and a fluid outlet 12a, 12b, 12c for introducing and for discharging the heat transfer fluid F respectively.

[0066] By means of the first adjustable valve device 10a, the fluid inlet 11b of the thermochemical reactor 5 can be optionally connected to the fluid outlet 12a, 12c of the first or second heat reservoir 2a, 2b. By means of the second adjustable valve device 10b, the fluid outlet 12b of the thermochemical reactor 5 can be optionally connected to the fluid inlet 11a, 11c of the first or second heat reservoir 2a, 2b. By means of the third adjustable valve device 10c, the first sub-store 101a can be optionally connected via the first heat reservoir 2a or directly to the first valve device 10a. By means of the fourth valve device 10d, the second sub-store 101b can be optionally connected via the second heat reservoir 2b or directly to the first valve device 10a.

[0067] As is evident from FIG. 1, the third valve device 10c can be directly connected to the first valve device 10a by means of a first fluid line 6a. Likewise, the fourth valve device 10d is fluidically connected directly to the first valve device 10a by means of a second fluid line 6b. The first fluid line 6a is realised as a bypass line of the first heat reservoir 2a. The second fluid line 6b is realised as a bypass line of the second heat reservoir 2b.

[0068] As is evident from FIG. 1, furthermore, the temporary heat store 100 is fluidically connected in parallel with the second valve device 10b, so that the fluid inlet 11a of the first heat reservoir 2a fluidically communicates with the first sub-store 101a and the fluid inlet 11c of the second heat reservoir 2b fluidically connects with the second sub-store.

[0069] The four valve devices 10a-10d are each designed as 3/2-way changeover valves 13a, 13b, 13c, 13d. Preferably, the third and fourth 3/2-way valves are designed as self-switching valves.

[0070] In the following, a complete thermal cycle of the thermochemical reactor 5 is now explained, during which the thermochemical reactor 5 is changed over between a first state with temperature T.sub.1 of the first heat reservoir 2a and a second state with temperature T.sub.2 of the second heat reservoir 2b and back into the starting state.

[0071] By the control/regulating device 4, the valve devices 10a, 10b of the valve system 9 can be adjusted into an operating state which is schematically shown in FIG. 1. This operating state can be referred to as heat discharge mode. In this operating state, the first sub-store 101a has a maximum volume and the second sub-store 101b a minimum volume, i.e. the first sub-store 101a of the temporary heat store 100 is filled with heat transfer fluid F, which has a temperature layering rising from the left to the right closely up to the temperature T.sub.1. Second sub-store 101b by contrast is empty. In this operating state, the heat transfer fluid circuit 3 forms a first part circuit 14a in which the heat transfer fluid F circulates between the thermochemical reactor 5 and the second heat reservoir 2b. In this operating state, the heat transfer fluid F transfers heat from the thermochemical reactor 5 into the second heat reservoir 2b, i.e. reaction heat is discharged from the thermochemical reactor 5 near the temperature level T.sub.2. In this operating state, the first valve device 10a and the second valve device 10b each connect the second heat reservoir 2b fluidically to the thermochemical store 5. The third and the fourth valve device 10c, 10d in this operating mode are not flowed through, which is why their positions are not relevant and can be any.

[0072] During the course of the thermal cycling, the thermochemical reactor 5 is now changed over into a state with temperature T.sub.1 of the first heat reservoir 2a, as a result of which a temperature change is carried out in order to substantially heat up the thermal masses. To this end, the four valve devices 10a to 10d are initially adjusted by the control/regulating device 4 into an operating state that is shown in FIG. 2. In the operating state shown in FIG. 2, the four valve devices 10a to 10d are adjusted in such a manner that the heat transfer fluid F is transported from the first sub-store 101a of the temporary heat store 100 into the thermochemical reactor 5. Furthermore, heat transfer fluid F is transported from the thermochemical reactor 5 into the second sub-store 101b.

[0073] For this purpose, the first valve device 10a and the third valve device 10c fluidically connect the thermochemical store 5, bypassing the first heat reservoir 2a, directly to the first sub-store 101a. The second and the fourth valve device 10b, 10d fluidically connect the thermochemical reactor 5 to the second sub-store 101b.

[0074] In this operating state, the temperature-layered heat transfer fluid F of the first sub-store 101a of the temporary heat store 100 is fed to the thermochemical reactor 5 via the line 6a, as a result of which the same is heated closely up to the limit temperature T.sub.1. Conversely, the second sub-store 101b is filled with heat transfer fluid F with increasing temperature, as a result of which the liquid column stored there is subjected to a temperature layering the temperature of which increases from the left to the right within the temperature limits T.sub.2 and T. The variable storage volume 102a of the first sub-store 101a decreases through movement of the separating element 106, the variable volume 102b of the second sub-store 101b increases at the same time. In this operating state, the temperature of the thermochemical reactor increases from T.sub.2 to T.sub.1.

[0075] As soon as the heat transfer fluid F temporarily stored in the first sub-store 101a of the temporary heat store 100 has been completely extracted from the temporarily store 100, the separating element 106 is located in the abovementioned first end position, which can be detected by the control/regulating device 4 by means of the first sensor element 110a.

[0076] The operating state shown in FIG. 2 can also be referred to as heating-up mode. In this operating state, increasingly hotter fluid from the temporary heat store 100 is fed to the thermochemical store 100, as a result of which the same is brought with stored heat from the lower temperature level, near the temperature T.sub.2, to the upper temperature level, near the temperature T.sub.1.

[0077] Following this, the two valve devices 10a, 10b are switched by the control/regulating device 4 into an operating state which is schematically shown in FIG. 3.

[0078] In the operating state schematically shown in FIG. 3, the heat transfer fluid circuit 3 forms a second part circuit 14b, in which the heat transfer fluid F circulates between the thermochemical reactor 5 and the first heat reservoir 2a. In this way, heat is transported from the first heat reservoir 2a to the thermochemical reactor 5.

[0079] For this purpose, the first valve device 10a and the second valve device 10b each fluidically connect the first heat reservoir 2a to the thermochemical reactor 5. The third and the fourth valve device 10c, 10d are not flowed through in this operating mode which is why their positions are not relevant, i.e. can be any.

[0080] In this operating state, reaction heat near the temperature T.sub.1 is transferred from the first heat reservoir 2a to the thermochemical reactor 5. In this operating state, the second sub-store 101b has a maximum volume and the first sub-store 101a a minimum volume, i.e. the second sub-store 101b of the temporary heat store 100 is filled with heat transfer fluid F, which has a temperature layering which rises from the left to the right closely up to the temperature T.sub.1. By contrast, the first sub-store 101a is empty. The operating state shown in FIG. 3 can be referred to as heat supply mode.

[0081] Following this, the valve devices 10a, 10, 10c, 10d are adjusted by the control/regulating device 4 into an operating shown in FIG. 4.

[0082] In the operating state shown in FIG. 4, the so-called cooling-down mode, the valve devices 10a to 10d are adjusted in such a manner that the heat transfer fluid F stored in the second sub-store 101b in a temperature-layered manner, bypassing the second heat reservoir 2b, is transported into the thermochemical reactor 5. Simultaneously with this, heat transfer fluid F is transported from the thermochemical reactor 5 into the first sub-store 101a of the temporary heat store 100. In the operating state according to FIG. 4, the first valve device 10a and the fourth valve device 10d fluidically connect the thermochemical store 5 bypassing the second heat reservoir 2b directly to the second sub-store 101b. The second valve device 10b and the third valve device 10c fluidically connect the thermochemical store 5 directly to the first sub-store 101a.

[0083] As soon as the temperature-layered heat transfer fluid F that is temporarily stored in the second sub-store 101b of the temporary heat store 100 has been completely extracted from the temporary heat store 100, the separating element 106 is located in the abovementioned second end position, which can be detected by the control/regulating device 4 with the help of the second sensor element 110b. In this state, the first sub-store 101a is completely filled with the heat transfer fluid F (see FIG. 1). The valve devices 10a to 10b are again switched into the operating state shown in FIG. 1 by the control/regulating device 4 and a complete changeover cycle of the thermochemical reactor 5 is concluded.

[0084] FIG. 6 shows a further development of the vessel 103 of FIG. 5. In the case of the vessel 103 of FIG. 6, a helical structure 113 is arranged in the interior 107 of the housing 104. This helical structure 113 imparts the interior 107 the geometry of a fluid passage 114 with helical geometry. Here, the fluid passage 114 is delimited by the helical structure 113 and by the housing 104, in particular by the circumferential wall 111 of the same. The helical structure 103 can be designed as insert 115 arranged in the interior. The helical structure 113 can comprise at least 10 windings 116, preferably even at least 20 windings. The separating element 106 is designed adjustable along the helical fluid passage 114. This means the geometrical shaping of the separating element 106 is selected in such a manner that it is adjustable in the interior 107 along the fluid passage 114, which is delimited by the circumferential wall 111 and the helical structure 113.

[0085] FIG. 7 shows a further version of the example of FIG. 5, in the case of which the vessel 103 is realised as a body 117 formed hose-like, which along an extension direction E does not extend in a straight line at least in sections. In this version, the separating element 106 for forming the two volume-variable sub-stores 101a, 101b moveably lies against the inside 112 of the circumferential wall 111 of the hose-like body 117 along the extension direction E. This version allows a spatially particularly compact assembly of the vessel 103. Preferably, a length of the housing 104 or of the hose-like body 117 measured along the extension direction E amounts to at least 20 times, preferentially at least 50 times of a transverse direction Q measured transversely to the extension direction E.