Double Cooled Draft Beer Machine

Abstract

A draft beer machine comprising a cabinet, and a refrigeration circuit inside the cabinet, including a compressor, a condenser, and an evaporator. Inside the cabinet, a cold storage chamber is used to hold the cask, and the evaporator can refrigerate the cold storage chamber. A beer pipe is also inside the cabinet, and a beer tap is fixed to the outside of the cabinet. The outer end of the beer pipe is connected to the beer tap, and its inner end is used to connect to the cask. The cold storage chamber has a single chamber structure. Inside the cold storage chamber, there is a refrigeration tube. The refrigeration tube is connected to the refrigeration circuit and is in parallel with the evaporator. The refrigeration tube and the beer pipe are wound into a quick cooler of a round or an elliptic cylindrical shape, in an abreast and helical manner.

Claims

1. A double cooled draft beer machine, comprising: a cabinet (1); a refrigeration circuit inside the cabinet (1), the refrigeration circuit including a compressor (2), a condenser (3), and an evaporator (4); a cold storage chamber (6) inside the cabinet (1), the cold storage chamber (6) capable of holding a cask (5), and the evaporator (4) capable of refrigerating the cold storage chamber (6); a beer pipe (7) arranged inside the cabinet (1); a beer tap (8) fixed to an outside of the cabinet (1); an outer end of the beer pipe (7) is connected to the beer tap (8); an inner end of the beer pipe (7) capable of connecting to the cask (5); and a refrigeration tube (9) inside the cold storage chamber (6); wherein the cold storage chamber (6) has a single chamber structure; wherein the refrigeration tube (9) is connected to the refrigeration circuit and is in parallel with the evaporator (4); wherein the refrigeration tube (9) and the beer pipe (7) are wound into a quick cooler (10) of a round or an elliptic cylindrical shape; and wherein the refrigeration tube (9) and the beer pipe (7) are wound in an abreast and helical manner.

2. The double cooled draft beer machine as claimed in claim 1, further comprising: a door (11) capable of opening or closing the cold storage chamber (6), the door (11) arranged at a front of the cabinet (1); wherein the quick cooler (10) is located at a rear of the cold storage chamber (6).

3. The double cooled draft beer machine as claimed in claim 2 wherein the cabinet (1) comprises a housing (1a) and an inner container (1b), the inner container (1b) arranged inside the housing (1a); wherein the cold storage chamber (6) is in an inner cavity of the inner container (1b); and wherein there is a space between an outer wall of the inner container (1b) and an inner wall of the housing (1a).

4. The double cooled draft beer machine as claimed in claim 3 wherein a mounting cover (13) is fixed to a top of an inner wall of the inner container (1b); wherein the evaporator (4) is arranged between the mounting cover (13) and the inner container (1b); and wherein on the mounting cover (13), there is a blower (14) capable of blowing cold air diffused from the evaporator (4) into the cold storage chamber (6).

5. The double cooled draft beer machine as claimed in claim 1 wherein the quick cooler (10) comprises at least one mixing layer (10a), each mixing layer (10a) is formed by winding the laterally abutting the refrigeration tube (9) and the beer pipe (7) simultaneously into a round or elliptic cylinder, and formed in an abreast and helical manner; and wherein in the same mixing layer (10a), the adjacent beer pipe (7), and the refrigeration tube (9) adhere to each other.

6. The double cooled draft beer machine as claimed in claim 5 wherein a refrigeration layer (10b) is arranged inside an innermost mixing layer (10a); wherein the refrigeration layer (10b) is formed by winding the refrigeration tubes (9) into a round or elliptic cylinder, in a helical manner; and wherein the refrigeration layer (10b) and the innermost mixing layer (10a) adhere to each other, either directly or with a thermal conductive medium filled in between the refrigeration layer (10b) and the innermost mixing layer (10a).

7. The double cooled draft beer machine as claimed in claim 6 wherein a beer pipe layer (10c) is sleeved over an outside of the outermost mixing layer (10a); wherein the beer pipe layer (10c) is formed by winding beer pipes (7) into a round or elliptic cylinder, in a helical manner; and wherein the beer pipe layer (10c) and the outermost mixing layer (10a) adhere to each other, either directly or with a thermal conductive medium filled in between the beer pipe layer (10c) and the outermost mixing layer (10a).

8. The double cooled draft beer machine as claimed in claim 7 wherein the quick cooler (10) is formed by winding one refrigeration tube (9) and at least two beer pipes (7); and wherein each beer pipe (7) is wound into each mixing layer (10a).

9. The double cooled draft beer machine as claimed in claim 8 wherein a shell (15) used to hold the quick cooler (10) is arranged outside of the quick cooler (10); wherein the quick cooler (10) is located inside the shell (15); and wherein an insulation layer (16) is set up between the quick cooler (10) and an inner wall of the shell (15).

10. The double cooled draft beer machine as claimed in claim 5 wherein there are at least two adjacent mixing layers (10a); and wherein the two adjacent mixing layers (10a) adhere to each other, either directly or with a thermal conductive medium filled in between the two adjacent mixing layers (10a).

11. The double cooled draft beer machine as claimed in claim 10 wherein a refrigeration layer (10b) is arranged inside an innermost mixing layer (10a); wherein the refrigeration layer (10b) is formed by winding the refrigeration tubes (9) into a round or elliptic cylinder, in a helical manner; and wherein the refrigeration layer (10b) and the innermost mixing layer (10a) adhere to each other, either directly or with a thermal conductive medium filled in between the refrigeration layer (10b) and the innermost mixing layer (10a).

12. The double cooled draft beer machine as claimed in claim 11 wherein a beer pipe layer (10c) is sleeved over an outside of the outermost mixing layer (10a); wherein the beer pipe layer (10c) is formed by winding beer pipes (7) into a round or elliptic cylinder, in a helical manner; and wherein the beer pipe layer (10c) and the outermost mixing layer (10a) adhere to each other, either directly or with a thermal conductive medium filled in between the beer pipe layer (10c) and the outermost mixing layer (10a).

13. The double cooled draft beer machine as claimed in claim 12 wherein the quick cooler (10) is formed by winding one refrigeration tube (9) and at least two beer pipes (7); and wherein each beer pipe (7) is wound into each mixing layer (10a) continuously.

14. The double cooled draft beer machine as claimed in claim 13 wherein a shell (15) used to hold the quick cooler (10) is arranged outside of the quick cooler (10); wherein the quick cooler (10) is located inside the shell (15); and wherein an insulation layer (16) is set up between the quick cooler (10) and an inner wall of the shell (15).

15. The double cooled draft beer machine as claimed in claim 10 wherein at least one solenoid valve, including a first solenoid valve, is part of the refrigeration circuit; wherein the first solenoid valve is capable of opening or closing the refrigeration circuit for refrigerant to flow toward the refrigeration tube (9) or the evaporator (4); wherein the double cooled draft beer machine further comprises a relay (20) capable of controlling an action of the first solenoid valve, and a first thermostat (18) capable of detecting temperature; wherein a detection point of the first thermostat (18) is located between the refrigeration tube (9) and the beer pipe (7); wherein the first thermostat (18) is in parallel with the relay (20); and wherein a contact of the relay (20) is connected to the compressor (2) and to a solenoid of the first solenoid valve; wherein when the temperature detected by the first thermostat (18) is higher than a first upper limit temperature threshold set by the first thermostat (18), the relay (20) controls the first solenoid valve to allow the refrigerant in the refrigeration circuit to stop flowing toward the evaporator (4), and to flow only toward the refrigeration tube (9); and wherein when the temperature detected by the first thermostat (18) is equal to or lower than a first lower limit temperature threshold set by the first thermostat (18), the relay (20) controls the first solenoid valve to allow the refrigerant in the refrigeration circuit to stop flowing toward the refrigeration tube (9).

16. The double cooled draft beer machine as claimed in claim 15 wherein a second thermostat (19) that can detect an inner temperature of the cold storage chamber (6) is arranged inside the cold storage chamber (6); wherein the second thermostat (19) is in series with a series branch consisting of the first thermostat (18) and the relay (20); wherein when the temperature detected by the first thermostat (18) is equal to or lower than the first lower limit temperature threshold, and the inner temperature of the cold storage chamber (6) is higher than a second upper limit temperature threshold set by the second thermostat (19), the relay (20) controls the first solenoid valve to allow the refrigerant in the refrigeration circuit to flow toward the evaporator (4); and wherein when the temperature detected by the first thermostat (18) is equal to or lower than the first lower limit temperature threshold, and the inner temperature of the cold storage chamber (6) is equal to or lower than a second lower limit temperature threshold set by the second thermostat (19), the second thermostat (19) switches off and causes the compressor (2) to stop working.

17. The double cooled draft beer machine as claimed in claim 16 wherein The first solenoid valve is a three-way solenoid valve (17); Wherein an inlet of the three-way solenoid valve (17) is connected to a refrigerant outlet of the condenser (3); wherein a first outlet of the three-way solenoid valve (17) is connected to the refrigeration tube (9); and wherein a second outlet of the three-way solenoid valve (17) is connected to the evaporator (4).

18. The double cooled draft beer machine as claimed in claim 16 wherein a second solenoid valve (23) is part of the refrigeration circuit and the first solenoid valve is a two-way solenoid valve (22); wherein an inlet of the first solenoid valve (22) is connected to a refrigerant outlet of the condenser (3); wherein an outlet of the first solenoid valve (22) is connected to the refrigeration tube (9); wherein an inlet of the second solenoid valve (23) is connected to the refrigerant outlet of the condenser (3); wherein an outlet of the second solenoid valve (23) is connected to the evaporator (4); wherein the relay (20) has both a normally open contact and a normally closed contact; wherein the normally open contact is connected to the first solenoid valve (22); and wherein the normally closed contact is connected to the second solenoid valve (23).

19. The double cooled draft beer machine as claimed in claim 2 wherein in the refrigeration circuit, at least one solenoid valve is set up; wherein the solenoid valve is capable of opening or closing the refrigeration circuit for refrigerant to flow toward the refrigeration tube (9) or the evaporator (4); wherein the double cooled draft beer machine further comprises a relay (20) capable of controlling an action of the solenoid valve, and a first thermostat (18) capable of detecting temperature; wherein a detection point of the first thermostat (18) is located between the refrigeration tube (9) and the beer pipe (7); wherein the first thermostat (18) is in parallel with the relay (20); and wherein a contact of the relay (20) is connected to the compressor (2) and to a solenoid of the solenoid valve; wherein when the temperature detected by the first thermostat (18) is higher than a first upper limit temperature threshold set by the first thermostat (18), the relay (20) controls the solenoid valve to allow the refrigerant in the refrigeration circuit to stop flowing toward the evaporator (4), and to flow only toward the refrigeration tube (9); and wherein when the temperature detected by the first thermostat (18) is equal to or lower than a first lower limit temperature threshold set by the first thermostat (18), the relay (20) controls the solenoid valve to allow the refrigerant in the refrigeration circuit to stop flowing toward the refrigeration tube (9).

20. The double cooled draft beer machine as claimed in claim 3 wherein in the refrigeration circuit, at least one solenoid valve is set up; wherein the solenoid valve is capable of opening or closing the refrigeration circuit for refrigerant to flow toward the refrigeration tube (9) or the evaporator (4); wherein the double cooled draft beer machine further comprises a relay (20) capable of controlling an action of the solenoid valve, and a first thermostat (18) capable of detecting temperature; wherein a detection point of the first thermostat (18) is located between the refrigeration tube (9) and the beer pipe (7); wherein the first thermostat (18) is in parallel with the relay (20); and wherein a contact of the relay (20) is connected to the compressor (2) and to a solenoid of the solenoid valve; wherein when the temperature detected by the first thermostat (18) is higher than a first upper limit temperature threshold set by the first thermostat (18), the relay (20) controls the solenoid valve to allow the refrigerant in the refrigeration circuit to stop flowing toward the evaporator (4), and to flow only toward the refrigeration tube (9); and wherein when the temperature detected by the first thermostat (18) is equal to or lower than a first lower limit temperature threshold set by the first thermostat (18), the relay (20) controls the solenoid valve to allow the refrigerant in the refrigeration circuit to stop flowing toward the refrigeration tube (9).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG. 1 is a perspective view of one embodiment of the double cooled draft beer machine.

[0032] FIG. 2 is a perspective view of one embodiment of the double cooled draft beer machine where a shell and an insulation layer are omitted.

[0033] FIG. 3 is a perspective view of one embodiment of the double cooled draft beer machine in use.

[0034] FIG. 4 is a first schematic view of one embodiment of an inside of the double cooled draft beer machine.

[0035] FIG. 5 is a second schematic view of one embodiment of an inside of the double cooled draft beer machine.

[0036] FIG. 6 is a perspective view of one embodiment of a quick cooler in the double cooled draft beer machine.

[0037] FIG. 7 is a sectional view of one embodiment of the double cooled draft beer machine.

[0038] FIG. 8 is a detailed view of Section A in FIG. 7.

[0039] FIG. 9 is a sectional view of one embodiment of a quick cooler, a shell, and an insulation layer in the double cooled draft beer machine.

[0040] FIG. 10 is a schematic illustration of a first electrical circuit connection diagram of a first embodiment.

[0041] FIG. 11 is a schematic illustration of a second electrical circuit connection diagram of a first embodiment.

[0042] FIG. 12 is a schematic illustration of a first electrical circuit connection diagram of a second embodiment.

[0043] FIG. 13 is a schematic illustration of a second electrical circuit connection diagram of a second embodiment.

DETAILED DESCRIPTION OF THE INVENTION

[0044] The embodiments of this invention will be described below and the technical solutions of the invention will be further illustrated in connection with the accompanying figures. However, the present invention shall not be limited to these embodiments.

First Embodiment

[0045] As shown in FIG. 1 through FIG. 5, one embodiment of the present double cooled draft beer machine comprises a cabinet (1). Inside the cabinet (1), there is a cold storage chamber (6) used to hold the cask (5). A door which can open or close the cold storage chamber (6) is arranged in the front of the cabinet (1). A beer pipe (7), a compressor (2), a condenser (3) and an evaporator (4) are also arranged inside the cabinet (1), and a beer tap (8) is fixed to the outside of the cabinet (1). The inner end of the beer pipe (7) is connected to the cask (5), and the outer end of the beer pipe (7) is connected to the beer tap (8).

[0046] As shown in FIG. 4, the cabinet (1) comprises a housing (1a) and an inner container (1b) arranged inside the housing (1a). The inner cavity of the inner container (1b) is the cold storage chamber (6), and there is a space between the outer wall of the inner container (1b) and the inner wall of the housing (1a).

[0047] The present draft beer machine achieves a double cooling function through one compressor (2). The compressor (2), the condenser (3) and the evaporator (4) form a refrigeration circuit. A condenser blower (24) is also arranged on one side of the condenser (3). The evaporator (4) can refrigerate the cask (5) inside the cold storage chamber (6), making the present draft beer machine to have a refrigeration function. In addition, a refrigeration tube (9) is connected to the refrigeration circuit, and the refrigeration tube (9) is in parallel with the evaporator (4). The refrigeration tube (9) can refrigerate the beer pipe (7), making the present draft beer machine to have a quick cooling function to achieve quick refrigeration.

[0048] Specifically, as shown in FIG. 4, a mounting cover (13) is fixed to the top of the inner wall of the inner container (1b), and the evaporator (4) is arranged between the mounting cover (13) and the inner container (1b). On the mounting cover (13), there is also a blower (14). The blower (14) can blow the cold air diffused from the evaporator (4) into the cold storage chamber, making the cold storage chamber to maintain a range of relatively low temperature. This improves the shelf life of beer and prevents beer from spoiling. The evaporator (4) is also located in the top of the cold storage chamber. The wind sent out by the blower (14) will not be blocked by the cask (5), which facilitates the circulation of cold air, so as to utilize the cooling capacity efficiently and improves the refrigeration effect of the cold storage chamber (6).

[0049] The cold storage chamber (6) has a single chamber structure, and both of the refrigeration tube (9) and the cask (5) are located inside the cold storage chamber (6). When the refrigeration tube (9) is refrigerating the beer pipe (7), the diffused cooling capacity can also be used to lower the temperature of the cold storage chamber (6) and hence to refrigerate the cask (5). Such a design makes the utilization of the cooling capacity more efficiently, and hence improves the refrigeration effect. As shown in FIG. 2 and FIG. 6, a round quick cooler (10) is formed by winding the refrigeration tubes (9) and beer pipes (7) in an abreast and helical manner. The quick cooler (10) is located in the rear of the cold storage chamber (6). The quick cooler (10) is arranged in the rear of the cold storage chamber (6), making the quick cooler (10) away from the door (11), so that the outward diffusion of the cooling capacity of the quick cooler (10) is minimized, the energy loss is reduced, and the refrigeration effect is improved. The helical manner allows a long contact distance between the refrigeration tube (9) and the beer pipe (7), and allows a long refrigeration path for beer in the beer pipe (7), so as to utilize the cooling capacity inside the refrigeration tube (9) highly efficiently, to improve the refrigeration effect of the refrigeration tube (9) to the beer pipe (7), and to ensure a relatively low serving temperature of the beer.

[0050] Specifically, as shown in FIG. 6, FIG. 7, and FIG. 8, the quick cooler (10) is formed by winding one refrigeration tube (9) and two beer pipes (7). The quick cooler (10) comprises at least one mixing layer (10a), which is formed by winding the refrigeration tube (9) and the beer pipe (7) into a round or elliptic cylinder, in an abreast and helical manner. In the same mixing layer (10a), the adjacent beer pipe (7) and refrigeration tube (9) adhere to each other. The adjacent two mixing layers (10a) directly adhere or a thermal conductive medium is filled in between the two layers. The thermal conductive medium is temperature conductive mud or aluminum powder. Each beer pipe (7) is wound into each mixing layer (10a). A refrigeration layer (10b) is arranged inside the innermost mixing layer (10a). The refrigeration layer (10b) is formed by winding the refrigeration tubes (9) into a round or elliptic cylinder, in a helical manner. The refrigeration layer (10b) and the innermost mixing layer (10a) directly adhere or a thermal conductive medium is filled in between the two layers. A beer pipe layer (10c) is sleeved over the outside of the outermost mixing layer (10a). The beer pipe layer (10c) is formed by winding the beer pipes (7) into a round or elliptic cylinder, in a helical manner. The beer pipe layer (10c) and the outermost mixing layer (10a) directly adhere or a thermal conductive medium is filled in between the two layers. As shown in FIG. 9, a shell (15) used to hold the quick cooler (10) is arranged outside of the quick cooler (10). The quick cooler (10) is located inside the shell (15), and an insulation layer (16) is set up between the quick cooler (10) and the inner wall of the shell (15). The mixing layer (10a) has a multiple layer structure. On one hand, the contact length between the refrigeration tube (9) and the beer pipe (7) is increased, the refrigeration path is increased and hence the refrigeration effect is improved; on the other hand, the refrigeration tube (9) in each mixing layer (10a) can refrigerate the beer pipe (7) in the adjacent mixing layer (10a), and the cooling capacity of the refrigeration tube (9) is utilized more efficiently, so as to improve the refrigeration effect.

[0051] As shown in FIG. 10 and FIG. 11, the refrigeration circuit of the present draft beer machine also comprises a solenoid valve used to open or close the refrigeration circuit for the refrigerant to flow toward the refrigeration tube (9) or the evaporator (4), a relay (20) used to control the action of the solenoid valve, and the first thermostat (18) used to detect the temperature of the inflowing beer of the beer pipe (7). The first thermostat (18) is in parallel with the relay (20), and the contact of the relay (20) is connected to the solenoid of the solenoid valve, as well as the compressor (2). When the temperature detected by the first thermostat (18) is higher than the first upper limit temperature threshold set by the first thermostat (18), the relay (20) controls the solenoid valve to allow the refrigerant in the refrigeration circuit to stop flowing toward the evaporator (4), and to flow toward the refrigeration tube (9) only. When the temperature detected by the first thermostat (18) is equal to or lower than the first lower limit temperature threshold set by the first thermostat (18), the relay (20) controls the solenoid valve to allow the refrigerant in the refrigeration circuit to stop flowing toward the refrigeration tube (9). The current input terminal of the electromagnetic coil of the relay (20) and the contact of the relay (20) are connected to one end of the first thermostat (18), and the other end of the first thermostat (18) is connected to a power supply (21). The current output terminal of the electromagnetic coil of the relay (20) is connected to the power supply to form a circuit. The other contact of the relay (20) is connected to the current input terminal of the solenoid valve and the current input terminal of the compressor (2) respectively. The current output terminal of the solenoid valve and the current output terminal of the compressor (2) are connected to the power supply (21). One end of the second thermostat (19) is connected to the power supply (21), and the other end is connected to the current input terminal of the compressor (2). A thermal protector (25), which can prevent the compressor (2) from overheating, is also connected between the current input terminal of the compressor (2) and the second thermostat (19). The first thermostat (18) is arranged between the beer pipe layer (10c) and the outermost mixing layer (10a), and the detection point of the first thermostat (18) is close to the outlet end of the beer pipe (7) of the quick cooler (10).

[0052] The solenoid valve (17) is a 3-way solenoid valve. The inlet of the 3-way solenoid valve (17) is connected to the refrigerant outlet of the condenser (3), one outlet of the 3-way solenoid valve (17) is connected to the refrigeration tube (9), and the other outlet is connected to the evaporator (4). The second thermostat (19) which can detect the inner temperature of the cold storage chamber (6) is arranged inside the cold storage chamber (6). The second thermostat (19) is in series with a series branch consisting of the first thermostat (18) and the relay (20). When the temperature detected by the first thermostat (18) is equal to or lower than the first lower limit temperature threshold, and the inner temperature of the cold storage chamber (6) is higher than the second upper limit temperature threshold set by the second thermostat (19), the relay (20) controls the 3-way solenoid valve (17) to allow the refrigerant in the refrigeration circuit to flow toward the evaporator (4). When the temperature detected by the first thermostat (18) is equal to or lower than the first lower limit temperature threshold, and the inner temperature of the cold storage chamber (6) is equal to or lower than the second lower limit temperature threshold set by the second thermostat (19), the second thermostat (19) switches off and makes the compressor (2) stop working.

[0053] The present draft beer machine achieves the refrigeration to the evaporator (4) and the refrigeration tube (9) respectively through one compressor (2). Since when the temperature detected by the first thermostat (18) is higher than the first upper limit temperature threshold set by the first thermostat (18), the relay (20) controls the 3-way solenoid valve (17) to allow the refrigerant in the refrigeration circuit to flow toward the refrigeration tube (9) only. Therefore, regarding the distribution of the cooling capacity, the present draft beer machine refrigerates the beer pipe first. This is reflected in that:

[0054] On one hand, when the draft beer machine is switched on and in operation, the temperature of the cold storage chamber (6) and the temperature inside the beer pipe (7) are both relatively high. At this point, the 3-way solenoid valve (17) makes the refrigerant flow toward the refrigeration tube (9) only, and the beer pipe (7) is refrigerated first. When the temperature of the beer pipe (7) is equal to or lower than the first lower limit temperature threshold, it is then switched to refrigerate the cold storage chamber (6). This manner can ensure that the draft beer machine can fulfill the refrigeration of discharged beer quickly, features of pre-cooling no longer needed and switch on and ready to use are achieved. On the other hand, during the refrigeration process of the cold storage chamber (6), no matter whether the cold storage chamber (6) reaches the appropriate temperature range or not, if the beer tap (8) is opened frequently to discharge beer, the temperature detected by the first thermostat (18) is higher than the first upper limit temperature threshold set by the first thermostat (18). At this point, the relay (20) will control the 3-way solenoid valve (17) to act and forcibly switch, to allow the refrigerant in the refrigeration circuit to stop flowing toward the evaporator (4), and to flow toward the refrigeration tube (9) only. The beer pipe (7) is then refrigerated so as to ensure cool beer can be served whenever the beer tap is opened.

Second Embodiment

[0055] The structure and principle of this embodiment are basically the same as that of the first embodiment. The differences are:

[0056] An elliptic cylindrical quick cooler (10) is formed by winding the refrigeration tubes (9) and beer pipes (7) in a helical manner.

Third Embodiment

[0057] The structure and principle of this embodiment is basically the same as that of the first embodiment or the second embodiment. The differences are:

[0058] The quick cooler (10) is formed by winding one refrigeration tube (9) and one beer pipe (7), or by winding one beer pipe (7) and at least three refrigeration tubes (9).

Fourth Embodiment

[0059] The structure and principle of this embodiment are basically the same as that of the first embodiment or the second embodiment or the third embodiment. The differences are:

[0060] As shown in FIG. 12 and FIG. 13, there are two solenoid valves: the first solenoid valve (22) and the second solenoid valve (23). The inlet of the first solenoid valve (22) is connected to the refrigerant outlet of the condenser (3), and the outlet is connected to the refrigeration tube (9). The inlet of the second solenoid valve (23) is connected to the refrigerant outlet of the condenser (3), and the outlet is connected to the evaporator (4). The relay (20) has both a normally open contact and a normally closed contact. The normally open contact is connected to the first solenoid valve (22) and the normally closed contact is connected to the second solenoid valve (23).

[0061] The description of the preferred embodiments thereof serves only as an illustration of the spirit of the invention. It will be understood by those skilled in the art that various changes or supplements in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

[0062] Although the terms of Cabinet (1), housing (1a), inner container (1b), Compressor (2), Condenser (3), evaporator (4), cask (5), cold storage chamber (6), beer pipe (7), beer tap (8), refrigeration tube (9), quick cooler (10), mixing layer (10a), refrigeration layer (10b), beer pipe layer (10c), door (11), mounting cover (13), blower (14), shell (15), insulation layer (16), etc. are often used herein, it does not exclude the possibility to use any other terms. Using such terms is only to describe or explain the nature of the present invention more conveniently. Any additional restrictions are contrary to the spirit of the present invention.

LIST OF REFERENCE NUMERALS

[0063] 1 Cabinet [0064] 1a Housing [0065] 1b Inner Container [0066] 2 Compressor [0067] 3 Condenser [0068] 4 Evaporator [0069] 5 Cask [0070] 6 Cold Storage Chamber [0071] 7 Beer Pipe [0072] 8 Beer Tap [0073] 9 Refrigeration Tube [0074] 10 Quick Cooler [0075] 10a Mixing Layer [0076] 10b Refrigeration Layer [0077] 10c Beer Pipe Layer [0078] 11 Door [0079] 13 Mounting Cover [0080] 14 Blower [0081] 15 Shell [0082] 16 Insulation Layer [0083] 17 3-Way Solenoid Valve [0084] 18 First Thermostat [0085] 19 Second Thermostat [0086] 20 Relay [0087] 21 Power Supply [0088] 22 First Solenoid Valve [0089] 23 Second Solenoid Valve [0090] 24 Condenser Blower [0091] 25 Thermal Protector