Closed-loop control valve module

Abstract

A closed-loop control valve module for closed-loop controlling a fluid flow is described, which comprises an electrical valve actuator motor, wherein a valve spindle comprising a frustoconical sealing section is displaceable by means of the valve actuator motor along a valve spindle axis and the frustoconical sealing section, depending on the position of the valve spindle, releases or separates off a flow channel connecting a fluid inlet and a fluid outlet. A pressure compensation channel is provided which, at least in the closed state of the closed-loop control valve module, connects an end of the valve spindle opposite the valve actuator motor to a pressure compensation area or the fluid inlet in terms of flow.

Claims

1. A closed-loop control valve module for closed-loop controlling a fluid flow, with an electrical valve actuator motor, wherein a valve spindle comprising a frustoconical sealing section is displaceable by means of the valve actuator motor along a valve spindle axis and the frustoconical sealing section, depending on the position of the valve spindle, releases or separates off a flow channel connecting a fluid inlet and a fluid outlet, wherein a pressure compensation channel is provided which, at least in the closed state of the closed-loop control valve module, connects an end of the valve spindle opposite the valve actuator motor to the fluid inlet in terms of flow, wherein at least a section of the pressure compensation channel is separate from the flow channel.

2. The closed-loop control valve module according to claim 1, characterized in that a fluid flow direction oriented from the fluid inlet to the fluid outlet at least in an area of a valve seat is oriented in the same direction as a widening direction of the frustoconical sealing section.

3. The closed-loop control valve module according to claim 2, characterized in that the frustoconical sealing section and the valve seat interact in a radially sealing manner.

4. The closed-loop control valve module according to claim 1, characterized in that the frustoconical sealing section and a valve seat interact in a radially sealing manner.

5. The closed-loop control valve module according to claim 1, characterized in that the end of the valve spindle opposite the valve actuator motor, delimits a cavity provided in a closed-loop control valve housing and the pressure compensation channel connects the cavity to the pressure compensation area or the fluid inlet in terms of flow.

6. The closed-loop control valve module according to claim 5, characterized in that the pressure compensation channel runs in the closed-loop control valve housing.

7. The closed-loop control valve module according to claim 5, characterized in that the pressure compensation channel runs in the valve spindle.

8. The closed-loop control valve module according to claim 6, characterized in that the pressure compensation channel runs in the valve spindle.

9. The closed-loop control valve module according to claim 8, characterized in that the pressure compensation channel comprises a pressure compensation channel section running substantially along the valve spindle axis and a pressure compensation channel section running substantially transverse to the valve spindle axis.

10. The closed-loop control valve module according to claim 9, wherein the pressure compensation channel section running transverse to the valve spindle axis fully traverses the valve spindle.

11. The closed-loop control valve module according to claim 9, characterized in that, in a closed state of the closed-loop control valve module, a mouth of the pressure compensation channel on the fluid inlet side is arranged on a fluid inlet side of the valve seat.

12. The closed-loop control valve module according to claim 11, wherein the mouth of the pressure compensation channel on the fluid inlet side is arranged adjacent to the sealing section.

13. The closed-loop control valve module according to claim 9, characterized in that in a closed state of the closed-loop control valve module a mouth of the pressure compensation channel on the pressure compensation area side is arranged inside a valve actuator housing.

14. The closed-loop control valve module according to claim 1, characterized in that the valve actuator motor can be operated in two directions.

15. The closed-loop control valve module according to claim 14, wherein the valve spindle is not spring-loaded.

16. The closed-loop control valve module according to claim 1, characterized in that the valve actuator motor is self-locking.

17. The closed-loop control valve module according to claim 1, characterized in that in a closed state of the closed-loop control valve module all surface areas of the valve spindle oriented in the axial direction which are in fluid connection with the pressure compensation area and point in the direction of the valve actuator motor correspond cumulatively to 75% to 125% of the cumulative surface areas of the valve spindle oriented in the axial direction which are in fluid connection with the pressure compensation area and point in a direction contrary to the valve actuator motor.

18. The closed-loop control valve module according to claim 1, characterized in that in a closed state of the closed-loop control valve module all surface areas of the valve spindle oriented in the axial direction which are in fluid connection with the fluid inlet and point in the direction of the valve actuator motor correspond cumulatively to 75% to 125% of the cumulative surface areas of the valve spindle oriented in the axial direction which are in fluid connection with the fluid inlet and point in a direction contrary to the valve actuator motor.

19. The closed-loop control valve module according to claim 1, characterized in that in a closed state of the closed-loop control valve module all surface areas of the valve spindle oriented in the axial direction which are in fluid connection with the fluid outlet and point in the direction of the valve actuator motor correspond cumulatively to 75% to 125% of the cumulative surface areas of the valve spindle oriented in the axial direction which are in fluid connection with the fluid outlet and point in a direction contrary to the valve actuator motor.

20. A closed-loop control valve module for closed-loop controlling a fluid flow, with an electrical valve actuator motor, wherein a valve spindle comprising a frustoconical sealing section is displaceable by means of the valve actuator motor along a valve spindle axis and the frustoconical sealing section, depending on the position of the valve spindle, releases or separates off a flow channel connecting a fluid inlet and a fluid outlet, wherein a pressure compensation channel is provided which, at least in the closed state of the closed-loop control valve module, connects an end of the valve spindle opposite the valve actuator motor to a pressure compensation area in terms of flow, wherein the pressure compensation area is an interior space of a valve drive housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained below with reference to various embodiment examples which are shown in the attached drawings. There are shown in:

(2) FIG. 1 a closed-loop control valve module according to the invention according to a first embodiment in a sectional representation,

(3) FIG. 2 a detail view of FIG. 1,

(4) FIG. 3 a view corresponding to FIG. 2 of a closed-loop control valve module according to the invention according to a second embodiment, wherein the closed-loop control valve module is represented in the open state,

(5) FIG. 4 the closed-loop control valve module according to the invention from FIG. 3 in a closed state and

(6) FIG. 5 a closed-loop control valve module according to the invention according to a third embodiment in a sectional representation.

(7) FIG. 6 corresponds to FIG. 2 but shows the valve spindle in a closed position.

(8) FIG. 7 corresponds to FIG. 5 but shows the valve spindle in an open position.

DETAILED DESCRIPTION

(9) FIG. 1 shows a closed-loop control valve module 10 for closed-loop controlling a fluid flow not represented in more detail.

(10) For this, the closed-loop control valve module 10 comprises an electrical valve actuator motor 12 which is arranged in a valve actuator housing 14.

(11) A valve spindle 16 can be displaced along a valve spindle axis 18 by means of the valve actuator motor 12.

(12) For this purpose, a transmission element 17 is interposed between the valve actuator motor 12 and the valve spindle 16.

(13) The valve actuator motor 12 can be operated in two directions. Thus it can move the valve spindle 16 in two opposite directions oriented along the valve spindle axis 18.

(14) Strictly speaking, a spring 19 loading the valve spindle 16 is not required in this connection. In the present case, it serves merely to support the valve actuator motor 12 when the latter moves the valve spindle 16 in a direction pointing towards the valve actuator motor 12. The spring 19 could also be omitted.

(15) In addition, the valve actuator motor 12 is self-locking. This means that the valve actuator motor 12 even in the deenergized state cannot be moved by forces acting from outside on the valve spindle 16.

(16) Provided on the valve spindle 16 is a frustoconical sealing section 20 which interacts in a radially sealing manner with a valve seat 22, depending on the position of the valve spindle 16. In this connection, the sealing section 20 can also be denoted closed-loop control cone.

(17) In an open state of the closed-loop control valve module 10, the frustoconical sealing section 20 releases a flow channel 24 which connects a fluid inlet 26 of the closed-loop control valve module 10 to a fluid outlet 28 of the closed-loop control valve module 10.

(18) In a closed state of the closed-loop control valve module 10, the frustoconical sealing section 20 separates off the flow channel 24. Thus the fluid inlet 26 and the fluid outlet 28 are also separated from each other.

(19) The closed-loop control valve module 10 is designed such that the frustoconical sealing section 20 is moved away from the valve actuator motor 12 in the direction of the open state.

(20) In addition, the frustoconical sealing section 20 is arranged such that a fluid flow direction running from the fluid inlet 26 via the flow channel 24 to the fluid outlet 28 in the area of the valve seat 22 is oriented in the same direction as a widening direction 30, which is symbolized by an arrow, of the frustoconical sealing section 20. This is also referred to as an under seat inflow.

(21) The valve seat 22, the flow channel 24 as well as most of the valve spindle 16 are placed in a closed-loop control valve housing 32.

(22) In addition, a pressure compensation channel 34 is provided which connects an end 36 of the valve spindle 16 opposite the valve actuator motor 12 to the fluid inlet 26 in terms of flow.

(23) The pressure compensation channel 34 runs in the closed-loop control valve housing 32.

(24) The end 36 of the valve spindle 16 opposite the valve actuator motor 12, to be precise an axial end surface 38 of the valve spindle 16 comprised by this end 36 (see FIG. 2) delimits a cavity 40 provided in the closed-loop control valve housing 32.

(25) The pressure compensation channel 34 thus connects the fluid inlet 26 to the cavity 40 in terms of flow.

(26) In the second embodiment of the closed-loop control valve module 10 represented in FIGS. 3 and 4, the pressure compensation channel 34 runs in the valve spindle 16.

(27) The pressure compensation channel 34 has a pressure compensation channel section 34a running substantially along the valve spindle axis 18 and a pressure compensation channel section 34b running substantially transverse to the valve spindle axis 18.

(28) The pressure compensation channel section 34b running transverse to the valve spindle axis 18 fully traverses the valve spindle 16.

(29) Furthermore, the pressure compensation channel sections 34a, 34b are arranged in the valve spindle 16 such that, in a closed state of the closed-loop control valve module 10, a mouth 42 of the pressure compensation channel 34 on the fluid inlet side is arranged on a fluid inlet side of the valve seat 22.

(30) In the embodiment represented in FIG. 4, the mouth 42 is formed by the two opposite ends of the pressure compensation channel section 34b running transverse to the valve spindle axis 18.

(31) Furthermore, the mouth 42 on the fluid inlet side is arranged adjacent to the sealing section 20.

(32) Thus in the second embodiment also, the pressure compensation channel 34 connects the end 36 of the valve spindle 16 opposite the valve actuator motor 12 to the fluid inlet 26 in terms of flow.

(33) For the further features and properties of the second embodiment, reference is made to the explanation of the first embodiment.

(34) A third embodiment of the closed-loop control valve module 10 is shown in FIG. 5.

(35) Unlike the above-named embodiments, the valve spindle 16 is now connected to the valve actuator motor 12, not represented in more detail in FIG. 5, such that it moves towards the valve actuator motor 12 in the direction of the open state of the closed-loop control valve module 10.

(36) The pressure compensation channel 34, which runs in the valve spindle 16, now connects the end 36 of the valve spindle 16 opposite the valve actuator motor 12 to a pressure compensation area which is formed in the third embodiment by an interior of the valve actuator housing 14.

(37) In a closed state of the closed-loop control valve module 10, a mouth 44 of the pressure compensation channel 34 opening into the pressure compensation area is arranged inside the valve actuator housing 14.

(38) The mouth 44 is again formed by the two opposite ends of the pressure compensation channel section 34b.

(39) In an additional variant, starting from the embodiment represented in FIG. 5, the pressure compensation channel 34 can be supplemented or replaced by an exhaust channel 46.

(40) The remaining properties and features of the third embodiment follow from the explanations above, to which reference is made.

(41) In all embodiments, the aim of the pressure compensation effected by means of the pressure compensation channel 34 is to keep the valve spindle 16 free from a resulting force oriented along the valve spindle axis 18.

(42) In other words, no resulting force is to act on the valve spindle 16 along the valve spindle axis 18, at least in the closed state of the closed-loop control valve module 10.

(43) In such a state, only a comparatively small drive force has to be exerted by means of the valve actuator motor 12 in order to move the valve spindle 16.

(44) In order to achieve this, all surface areas of the valve spindle 16 oriented in the axial direction along the valve spindle axis 18 which are in fluid connection with the pressure compensation area and point in the direction of the valve actuator motor 12 correspond cumulatively to 75% to 125% of the cumulative surface areas of the valve spindle 16 oriented in the axial direction which are likewise in fluid connection with the pressure compensation area and point in a direction contrary to the valve actuator motor 12.

(45) As already explained, in the embodiment according to FIG. 5 the pressure compensation area is formed by the interior of the valve actuator housing 14.

(46) Once the pressure prevailing in the pressure compensation area is substantially constant, a zero-force state can thus be achieved in that the surface areas oriented in different axial directions are matched to each other.

(47) In the case of surfaces running at an incline, only the surface area projected into an axial plane is to be taken into consideration in this connection.

(48) A valve spindle 16 which is almost fully pressure-compensated results. Thus, if fluid pressure is applied, almost no resulting force is experienced by it along the valve spindle axis 18.

(49) The same applies when the pressure compensation channel connects the end 36 opposite the valve actuator motor 12 to the fluid inlet 26 in terms of flow.

(50) Then, in a closed state of the closed-loop control valve module 10, all surface areas of the valve spindle 16 oriented in the axial direction along the valve spindle axis 18 which are in fluid connection with the fluid inlet 26 and point in the direction of the valve actuator motor 12 correspond cumulatively to 75% to 125% of the cumulative surface areas of the valve spindle 16 oriented in the axial direction along the valve spindle axis 18 which are in connection with the fluid inlet 26 and point in a direction contrary to the valve actuator motor 12.

(51) Here also, in the case of surfaces running at an incline, only the surface areas projected into an axial plane are to be taken into consideration.

(52) Thus also in the case of a pressure compensation channel 34 connected to the fluid inlet 26, a valve spindle 16 which is almost fully pressure-compensated results. Thus it experiences almost no resulting force along the valve spindle axis 18.

(53) In addition, the closed-loop control valve modules 10 according to the embodiments from FIGS. 1 and 5 are also pressure-compensated relative to the fluid outlet 28.

(54) Thus in a closed state of the closed-loop control valve modules 10, all surface areas of the valve spindle 16 oriented in the axial direction which are in fluid connection with the fluid outlet 28 and point in the direction of the valve actuator motor 12 correspond cumulatively to 75% to 125% of the cumulative surface areas of the valve spindle 16 oriented in the axial direction which are in fluid connection with the fluid outlet 28 and point in a direction contrary to the valve actuator motor 12.

(55) Consequently, starting from any back pressure applied at the fluid outlet 28, no or only a comparatively small resulting force acts on the valve spindle 16.