Heat pump unit with evaporator set and evaporator capable of defrosting

Abstract

The utility model relates to a heat pump unit with an evaporator set and an evaporator capable of defrosting. The heat pump unit comprises a compressor, first to fourth electromagnetic valves, a condenser, a temperature sensor set and the evaporator set. An inlet of the compressor is communicated with one port of the second electromagnetic valve and one port of the third electromagnetic valve, an outlet of the compressor is communicated with one port of the third electromagnetic valve and one port of the fourth electromagnetic valve, the other port of the first electromagnetic valve is communicated with the other port of the second electromagnetic valve, and the other port of the fourth electromagnetic valve is communicated with the other port of the third electromagnetic valve. A refrigerant inlet of the condenser is communicated with the other port of the first electromagnetic valve and the other port of the second electromagnetic valve, a refrigerant outlet of the condenser is communicated with a refrigerant inlet of the evaporator set, a refrigerant outlet of the evaporator set is communicated with the other port of the third electromagnetic valve and the other port of the fourth electromagnetic valve, and the temperature sensor set is located on the evaporator set. The system has the advantages that when the single compressor is matched with the evaporator set, the heat of a refrigerant is utilized most efficiently in a defrosting mode; and each evaporator can be independently defrosted.

Description

Technical Field

[0001] This utility model relates to a heat pump unit with an evaporator assembly and the evaporator capable of defrosting. Background Technology

[0002] Currently, when heat pump units operate at low ambient temperatures, the evaporator surface frosts extensively, requiring periodic defrosting. The existing defrosting method involves the unit using a four-way reversing valve to reverse the refrigerant flow. This means the high-temperature, high-pressure refrigerant from the compressor first flows into the evaporator, releases heat there, then passes through the condenser and circulates back to the compressor. During this process, the evaporator absorbs heat from the refrigerant components to complete the defrosting. This defrosting method has the following problems:

[0003] 1. The pilot valve inside the four-way valve is made of plastic, which is at risk of being burned during the welding process. It also has the unpredictable factor of jamming, which may prevent the unit from entering the defrosting mode.

[0004] 2. For large commercial air conditioning units, the weight of the four-way valve itself and the vibration caused by sudden changes in refrigerant resistance within the valve body can both lead to the risk of the four-way valve breaking and refrigerant leakage.

[0005] 3. For units with a single compressor, the unit cannot maintain heating while defrosting, which affects the user experience;

[0006] 4. For a unit with one compressor and multiple evaporators, due to the influence of manufacturing consistency and installation environment, the degree of frost and surface temperature of each evaporator are usually inconsistent. The unit cannot accurately control the distribution of refrigerant among each evaporator according to the actual needs of each evaporator, thus failing to achieve the best defrosting effect. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a heat pump unit with an evaporator assembly that can defrost. When a single compressor is matched with the evaporator assembly, in defrost mode, the refrigerant is precisely distributed as needed, making the most efficient use of the refrigerant's heat. Each evaporator can defrost independently, avoiding the impact of defrosting on the user's heating.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: it is a heat pump unit with an evaporator assembly and the evaporator capable of defrosting, characterized by comprising:

[0009] A compressor, a first solenoid valve, a second solenoid valve, a third solenoid valve, and a fourth solenoid valve; the compressor inlet is connected to one port of the second and third solenoid valves respectively, the compressor outlet is connected to one port of the third and fourth solenoid valves respectively, the other port of the first solenoid valve is connected to the other port of the second solenoid valve, and the other port of the fourth solenoid valve is connected to the other port of the third solenoid valve; and

[0010] The system includes a condenser, a temperature sensor group, and an evaporator group. The refrigerant inlet of the condenser is connected to the other ports of the first and second solenoid valves, respectively. The refrigerant outlet of the condenser is connected to the refrigerant inlet of the evaporator group. The refrigerant outlet of the evaporator group is connected to the other ports of the third and fourth solenoid valves, respectively. The temperature sensor group is located on the evaporator group to monitor the temperature of the evaporator group.

[0011] This technical solution also includes a three-way valve. The evaporator group includes a first evaporator and a second evaporator. One port of the first evaporator and the second evaporator are respectively connected to the refrigerant outlet of the condenser. The three-way valve has port a, port b and port c. The other port of the first evaporator is connected to port a of the three-way valve, the other port of the second evaporator is connected to port c of the three-way valve, and port b of the three-way valve is connected to the other ports of the third solenoid valve and the fourth solenoid valve.

[0012] In this technical solution, the temperature sensor group includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is located at the first evaporator and the second temperature sensor is located at the second evaporator.

[0013] This technical solution also includes a fifth, sixth, seventh, ninth, tenth, eleventh, and twelfth solenoid valve; the refrigerant outlet of the condenser is connected to one port of the tenth and eleventh solenoid valves respectively; the other port of the tenth solenoid valve is connected to one port of the first evaporator and one port of the ninth solenoid valve respectively; the other port of the eleventh solenoid valve is connected to one port of the second evaporator and one port of the twelfth solenoid valve respectively; the other port of the ninth solenoid valve is connected to the compressor inlet; the other port of the twelfth solenoid valve is connected to one port of the seventh solenoid valve and the compressor inlet respectively; the other port of the seventh solenoid valve is connected to one port of the sixth solenoid valve; the compressor outlet is connected to one port of the fifth solenoid valve; the other port of the fifth solenoid valve and the other port of the second evaporator are connected to the pipelines connected to the seventh and sixth solenoid valves respectively; and the other port of the sixth solenoid valve is connected to port C of the three-way valve.

[0014] The advantages of this invention compared to the prior art are: when a single compressor is matched with an evaporator group, in defrosting mode, the refrigerant is precisely allocated as needed, making the most efficient use of the refrigerant's heat; each evaporator can defrost independently, avoiding the impact of defrosting on the user's heating. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the first embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram of the second embodiment of this utility model. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0018] like Figure 1 and Figure 2 The above describes a heat pump unit with an evaporator assembly capable of defrosting, comprising:

[0019] The compressor 1 comprises a first solenoid valve 3, a second solenoid valve 4, a third solenoid valve 5, and a fourth solenoid valve 6. The inlet of the compressor 1 is connected to one port of the second solenoid valve 4 and the third solenoid valve 5, respectively; the outlet of the compressor 1 is connected to one port of the third solenoid valve 5 and the fourth solenoid valve 6, respectively; the other port of the first solenoid valve 3 is connected to the other port of the second solenoid valve 4; and the other port of the fourth solenoid valve 6 is connected to the other port of the third solenoid valve 5.

[0020] The condenser 2, temperature sensor group, and evaporator group are configured as follows: the refrigerant inlet of the condenser 2 is connected to the other port of the first solenoid valve 3 and the second solenoid valve 4, the refrigerant outlet of the condenser 2 is connected to the refrigerant inlet of the evaporator group, the refrigerant outlet of the evaporator group is connected to the other port of the third solenoid valve 5 and the fourth solenoid valve 6, and the temperature sensor group is located on the evaporator group to monitor the temperature of the evaporator group.

[0021] In operation, when the unit is running in heating mode, the first solenoid valve 3 and the third solenoid valve 5 are open, while the second solenoid valve 4 and the fourth solenoid valve 6 are closed. The refrigerant flows from the outlet of compressor 1, through the first solenoid valve 3, the condenser 2, the evaporator assembly, and the third solenoid valve 5 back to compressor 1. The refrigerant then enters the condenser 03 and releases heat there, before entering the evaporator 01 and absorbing heat there, and finally being drawn into compressor 02, completing one heating cycle. When the unit needs to enter defrost mode, the first solenoid valve 3 and the third solenoid valve 5 are closed, while the second solenoid valve 4 and the fourth solenoid valve 6 are open. The refrigerant flows from the outlet of compressor 1, through the fourth solenoid valve 6, the evaporator assembly, the condenser 2, and the second solenoid valve 4 back to compressor 1. The refrigerant enters the evaporator assembly and releases heat there, before entering the condenser 2 and absorbing heat there, and finally being drawn into compressor 1. The evaporator assembly absorbs heat and defrosts, thus completing one defrost cycle.

[0022] In this embodiment, a three-way valve 7 is also included. The evaporator assembly includes a first evaporator 8 and a second evaporator 9. One port of the first evaporator 8 and the second evaporator 9 are respectively connected to the refrigerant outlet of the condenser 2. The three-way valve 7 has ports a, b, and c. The other port of the first evaporator 8 is connected to port a of the three-way valve 7, and the other port of the second evaporator 9 is connected to port c of the three-way valve 7. Port b of the three-way valve 7 is connected to the other ports of the third solenoid valve 5 and the fourth solenoid valve 6, respectively. In use, there are two evaporator assemblies, with the first evaporator 8 and the second evaporator 9 connected to the third solenoid valve 5 and the fourth solenoid valve 6, respectively, via the three-way valve 7.

[0023] In this embodiment, the temperature sensor group includes a first temperature sensor 10 and a second temperature sensor 11. The first temperature sensor 10 is located at the first evaporator 8, and the second temperature sensor 11 is located at the second evaporator 9.

[0024] In this embodiment, it also includes a fifth solenoid valve 12, a sixth solenoid valve 13, a seventh solenoid valve 14, a ninth solenoid valve 15, a tenth solenoid valve 16, an eleventh solenoid valve 17, and a twelfth solenoid valve 18; the refrigerant outlet of the condenser 2 is connected to one port of the tenth solenoid valve 16 and the eleventh solenoid valve 17, respectively; the other port of the tenth solenoid valve 16 is connected to one port of the first evaporator 8 and one port of the ninth solenoid valve 15, respectively; the other port of the eleventh solenoid valve 17 is connected to one port of the second evaporator 9 and one port of the twelfth solenoid valve 18, respectively; and the other end of the ninth solenoid valve 15... The port is connected to one port of the second solenoid valve 4, one port of the third solenoid valve 5, and the inlet of the compressor 1, respectively. The other port of the twelfth solenoid valve 18 is connected to one port of the seventh solenoid valve 14 and the inlet of the compressor 1, respectively. The other port of the seventh solenoid valve 14 is connected to one port of the sixth solenoid valve 13, and the outlet of the compressor 1 is connected to one port of the fifth solenoid valve 12. The other port of the fifth solenoid valve 12 and the other port of the second evaporator 9 are connected to the pipelines connected to the seventh solenoid valve 14 and the sixth solenoid valve 13, respectively. The other port of the sixth solenoid valve 13 is connected to port c of the three-way valve 7.

[0025] During operation, when the unit is running in heating mode, the first solenoid valve 3, the eleventh solenoid valve 17, and the tenth solenoid valve 16 are open, the third solenoid valve 5, the sixth solenoid valve 13, and the seventh solenoid valve 14 are open or partially open, and the second solenoid valve 4, the fourth solenoid valve 6, the ninth solenoid valve 15, the twelfth solenoid valve 18, and the fifth solenoid valve 12 are closed. The refrigerant flows along the outlet of the compressor 1, through the first solenoid valve 3, and through the condenser 2, and then splits into two paths, flowing through the eleventh solenoid valve 17 and the tenth solenoid valve 16, and then enters the first evaporator 8 and the second evaporator 9 respectively. The refrigerant absorbs heat in the first evaporator 8 and the second evaporator 9. After absorbing heat, the refrigerant returns to the compressor 1 through part or all of the third solenoid valve 5, the sixth solenoid valve 13, and the seventh solenoid valve 14, thus completing the heating cycle.

[0026] Based on the above features, a control method for a heat pump unit is proposed. The sixth solenoid valve 13 is closed, while the third solenoid valve 5 and the seventh solenoid valve 14 are open. Two refrigerants are drawn into the compressor 1 via the three-way valve 7, the third solenoid valve 5, and the seventh solenoid valve 14, respectively, completing one heating cycle. Alternatively, the sixth solenoid valve 13 may be open, and at least one of the third solenoid valve 5 and the seventh solenoid valve 14 may be open. The refrigerant is drawn into the compressor 1 via the three-way valve 7 and either the third solenoid valve 5 or the seventh solenoid valve 14, completing the heating cycle.

[0027] A control method for a heat pump unit based on the above features is proposed, wherein the sixth solenoid valve 13, the third solenoid valve 5, and the seventh solenoid valve 14 are opened, and the refrigerant returns to the compressor 1 through multiple flow paths, thereby reducing the resistance when the refrigerant is drawn into the compressor 1.

[0028] A control method for a heat pump unit based on the above features is described, wherein the three-way valve 7 is a proportional three-way valve, the first temperature sensor 10 and the second temperature sensor 11 respectively detect the frosting signals of the first evaporator 8 and the second evaporator 9 and send them to the controller, and the controller adjusts the refrigerant flow at each port of the proportional three-way valve 7 according to the actual frosting situation of the first evaporator 8 and the second evaporator 9, thereby achieving the best defrosting effect.

[0029] Specifically, when the second evaporator 9 is heavily frosted, the flow rate of the proportional three-way valve 7 in the c-port direction is greater than that in the a-port direction; when the first evaporator 8 is heavily frosted, the flow rate of the proportional three-way valve 7 in the a-port direction is greater than that in the c-port direction; when the first evaporator 8 and the second evaporator 9 are equally frosted, the flow rate of the proportional three-way valve 7 is evenly distributed in the a-port and c-port directions.

[0030] Based on a control method for a heat pump unit, the first evaporator 8 and the second evaporator 9 can defrost independently to ensure that the unit can provide partial heating function while defrosting, reducing the impact on users' heating needs, as detailed below:

[0031] When the second evaporator 9 enters the defrosting phase, the first solenoid valve 3, the fifth solenoid valve 12, the third solenoid valve 5, the tenth solenoid valve 16, and the twelfth solenoid valve 18 open, while the second solenoid valve 4, the fourth solenoid valve 6, the sixth solenoid valve 13, the eleventh solenoid valve 17, the ninth solenoid valve 15, and the seventh solenoid valve 14 close. At this time, the refrigerant splits into two paths. One path runs along the compressor 1, the first solenoid valve 3, the condenser 2, the tenth solenoid valve 16, the first evaporator 8, the three-way valve 7, and the third solenoid valve 5 before returning to the compressor 1. The refrigerant then enters the condenser 2 and releases heat, then enters the first evaporator 8 and absorbs heat therein, finally being drawn into the compressor 1, completing one heating cycle. The other path runs along the compressor 1, the fifth solenoid valve 12, the second evaporator 9, and the twelfth solenoid valve 18 before returning to the compressor 1. The refrigerant then enters the second evaporator 9 and releases heat, finally being drawn into the compressor 1. The second evaporator 9 absorbs heat and defrosts, completing one defrosting cycle.

[0032] When the first evaporator 8 enters the defrosting phase, the first solenoid valve 3, the fourth solenoid valve 6, the eleventh solenoid valve 17, the ninth solenoid valve 15, and the seventh solenoid valve 14 open, while the second solenoid valve 4, the third solenoid valve 5, the sixth solenoid valve 13, the tenth solenoid valve 16, the twelfth solenoid valve 18, and the fifth solenoid valve 12 close. At this time, the refrigerant splits into two paths: one path runs along the compressor 1, the first solenoid valve 3, the condenser 2, the eleventh solenoid valve 17, the second evaporator 9, and the seventh solenoid valve 14 before returning to the compressor 1. The refrigerant then releases heat in the condenser 2, absorbs heat in the second evaporator 9, and finally enters the compressor 1, completing one heating cycle; the other path runs along the compressor 1, the fourth solenoid valve 6, the three-way valve 7, the first evaporator 8, and the ninth solenoid valve 15 before returning to the compressor 1. The refrigerant releases heat in the first evaporator 8, and finally enters the compressor 1, where it absorbs heat, completing one defrosting cycle.

[0033] The defrosting of the first evaporator 8 and the second evaporator 9 are carried out alternately.

[0034] The evaporator 8 that is defrosting and the evaporator 9 that is frosted more severely will preferentially enter the defrosting mode. The controller determines which of the two evaporators, the first evaporator 8 and the second evaporator 9, will enter the defrosting mode first based on the signals fed back by the first temperature sensor 10 and the second temperature sensor 11.

[0035] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations of these embodiments without departing from the principles and spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A heat pump unit with an evaporator group and defrosting of the evaporator, characterized in that Comprise: Compressor (1), first solenoid valve (3), second solenoid valve (4), third solenoid valve (5) and fourth solenoid valve (6); the inlet of the compressor (1) is communicated with one port of the second solenoid valve (4) and the third solenoid valve (5) respectively, the outlet of the compressor (1) is communicated with one port of the third solenoid valve (5) and the fourth solenoid valve (6) respectively, the other port of the first solenoid valve (3) is communicated with the other port of the second solenoid valve (4), the other port of the fourth solenoid valve (6) is communicated with the other port of the third solenoid valve (5); and Condenser (2), temperature sensor group and evaporator group; the refrigerant inlet of the condenser (2) is communicated with the other port of the first solenoid valve (3) and the second solenoid valve (4) respectively, the refrigerant outlet of the condenser (2) is communicated with the refrigerant inlet of the evaporator group, the refrigerant outlet of the evaporator group is communicated with the other port of the third solenoid valve (5) and the fourth solenoid valve (6) respectively, the temperature sensor group is located on the evaporator group to monitor the temperature of the evaporator group. Also comprising a three-way valve (7), the evaporator group comprises a first evaporator (8) and a second evaporator (9), one port of the first evaporator (8) and the second evaporator (9) is communicated with the refrigerant outlet of the condenser (2) respectively, the three-way valve (7) has a port, b port and c port, the other port of the first evaporator (8) is communicated with the a port of the three-way valve (7), the other port of the second evaporator (9) is communicated with the c port of the three-way valve (7), the b port of the three-way valve (7) is communicated with the other port of the third solenoid valve (5) and the fourth solenoid valve (6) respectively. The temperature sensor group comprises a first temperature sensor (10) and a second temperature sensor (11), the first temperature sensor (10) is located at the first evaporator (8), and the second temperature sensor (11) is located at the second evaporator (9).

2. The heat pump unit with the evaporator group and the defrosting evaporator according to claim 1, characterized in that ​ 3. The heat pump unit with the evaporator group and the defrosting evaporator according to claim 2, characterized in that ​ 4. The heat pump unit with the evaporator group and the defrosting evaporator according to claim 2 or 3, characterized in that Also include the fifth solenoid valve (12), the sixth solenoid valve (13), the seventh solenoid valve (14), the ninth solenoid valve (15), the tenth solenoid valve (16), the eleventh solenoid valve (17) and the twelfth solenoid valve (18); The refrigerant outlet of the condenser (2) is communicated with one port of the tenth solenoid valve (16) and the eleventh solenoid valve (17) respectively, the other port of the tenth solenoid valve (16) is communicated with one port of the first evaporator (8) and one port of the ninth solenoid valve (15) respectively, the other port of the eleventh solenoid valve (17) is communicated with one port of the second evaporator (9) and one port of the twelfth solenoid valve (18) respectively, the other port of the ninth solenoid valve (15) is communicated with the inlet of the compressor (1), the other port of the twelfth solenoid valve (18) is communicated with one port of the seventh solenoid valve (14) and the inlet of the compressor (1) respectively, the other port of the seventh solenoid valve (14) is communicated with one port of the sixth solenoid valve (13), the outlet of the compressor (1) is communicated with one port of the fifth solenoid valve (12), the other port of the fifth solenoid valve (12) and the other port of the second evaporator (9) are communicated with the pipeline communicated with the seventh solenoid valve (14) and the sixth solenoid valve (13) respectively, the other port of the sixth solenoid valve (13) is communicated with the c port of the three-way valve (7).

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