Air source heat pump unit

Abstract

The utility model discloses an air source heat pump unit with compressor air supply, which comprises a compressor, an indoor heat exchanger, a main path electronic expansion valve and an outdoor heat exchanger, an air supply heat exchanger is arranged between the indoor heat exchanger and the main path electronic expansion valve, an auxiliary path is led out between the air supply heat exchanger and the main path electronic expansion valve, the auxiliary path is provided with an auxiliary path electronic expansion valve, and part of refrigerant led out of the auxiliary path sequentially passes through the defrosting heater, the auxiliary path electronic expansion valve and the air supply heat exchanger and then communicates with an air supply opening of the compressor. The defrosting heater, the auxiliary electronic expansion valve and the air supply heat exchanger are used for flexibly adjusting the air supply temperature, it is ensured that the air supply temperature is controlled within a reasonable range, and meanwhile ice accumulation at the bottom of the outdoor heat exchanger is well restrained.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning technical field especially relates to a kind of air source heat pump unit with compressor air supplement. BACKGROUND

[0002] Compressor is the core component of heat pump system, to improve the performance of heat pump system, often design air supplement function for compressor, the role of air supplement mainly reflects in the following several aspects: increase exhaust volume, reduce exhaust temperature and improve heating capacity. In addition, in low-temperature areas such as north, with the decrease of outdoor temperature, the compression ratio of compressor increases, the evaporation temperature decreases, there is the problem of heating capacity decline under low-temperature environment. And air supplement for compressor is one of the measures to effectively overcome this problem under low-temperature environment of heat pump.

[0003] On the other hand, too high compressor air supplement temperature may cause a series of hazards, which mainly reflect in the following several aspects:

[0004] 1. Reduce compressor efficiency. Too high air supplement temperature will cause compressor to consume more energy during operation to complete compression work, thereby reducing the efficiency of compressor. This not only increases energy consumption, but also may affect the service life of compressor.

[0005] 2. Increase compressor load. Too high air supplement temperature will increase the load of compressor, so that the compressor runs under more severe working conditions. Long-term high-load operation will accelerate the wear and aging of compressor, and may even cause compressor failure.

[0006] 3. Overheating damage. Too high air supplement temperature may cause the temperature inside the compressor to rise sharply, causing overheating. Overheating not only affects the performance of compressor, but also may cause damage to internal parts of compressor, such as bearings, seals, etc.

[0007] Therefore, how to control the temperature of compressor air supplement is a technical problem that needs to be seriously considered in the industry. INVENTION CONTENTS

[0008] The utility model provides a kind of air source heat pump unit with compressor air supplement to solve the technical problem of too high compressor air supplement temperature.

[0009] The technical scheme adopted by the utility model is to design an air source heat pump unit, which includes a compressor, an indoor heat exchanger, a main path electronic expansion valve and an outdoor heat exchanger. A gas supplement heat exchanger is provided between the indoor heat exchanger and the main path electronic expansion valve. A secondary path is led out between the gas supplement heat exchanger and the main path electronic expansion valve. A secondary path electronic expansion valve is provided on the secondary path. The refrigerant led out by the secondary path communicates with the air supplement port of the compressor after passing through the secondary path electronic expansion valve and the gas supplement heat exchanger.

[0010] In an embodiment, a defrosting heater is arranged at the bottom of the outdoor heat exchanger, and the refrigerant led out by the auxiliary path is sequentially communicated with the defrosting heater, the auxiliary path electronic expansion valve and the gas supplement heat exchanger, and then communicated with the gas supplement port of the compressor.

[0011] Further, the air source heat pump unit further comprises a four-way reversing valve, a first interface of which is communicated with the exhaust pipe of the compressor, a second interface of which is communicated with the outdoor heat exchanger, a third interface of which is communicated with the indoor heat exchanger, and a fourth interface of which is communicated with the suction pipe of the compressor.

[0012] Preferably, the gas supplement heat exchanger is a plate heat exchanger.

[0013] Preferably, the outdoor heat exchanger is a finned tube heat exchanger.

[0014] Preferably, the defrosting heater is a finned heat exchanger.

[0015] Preferably, a filter is further arranged between the indoor heat exchanger and the gas supplement heat exchanger.

[0016] Preferably, a gas-liquid separator is arranged on the suction pipe of the compressor.

[0017] Preferably, the outdoor heat exchanger is provided with a fan.

[0018] In the refrigeration mode of the air source heat pump unit, the refrigerant is discharged from the compressor, enters the outdoor heat exchanger after the four-way valve, is throttled by the main path electronic expansion valve, and then is divided into two paths, one of which returns to the compressor after the gas supplement heat exchanger and the indoor heat exchanger, and the other of which enters the gas supplement port of the compressor after the defrosting heater, the auxiliary path electronic expansion valve and the gas supplement heat exchanger.

[0019] In the heating mode of the air source heat pump unit, the refrigerant is discharged from the compressor, enters the indoor heat exchanger after the four-way valve, is divided into two paths after the gas supplement heat exchanger, one of which is communicated with the suction pipe of the compressor after the main path electronic expansion valve, the outdoor heat exchanger and the four-way valve, and the other of which is communicated with the gas supplement port of the compressor after the defrosting heater, the auxiliary path electronic expansion valve and the gas supplement heat exchanger.

[0020] Compared with the prior art, the air source heat pump unit has the following beneficial effects:

[0021] 1. The defrosting heater, the auxiliary path electronic expansion valve and the gas supplement heat exchanger are used to flexibly adjust the temperature of the gas supplement, so that the gas supplement temperature is controlled in a reasonable range, the system exhaust temperature is reduced, and the harm of the high gas supplement temperature of the compressor to the system is avoided.

[0022] 2. The defrosting heater arranged at the bottom of the outdoor heat exchanger is provided with a heat source by the gas supplement refrigerant, and the ice accumulation at the bottom of the outdoor heat exchanger is well inhibited. Attached Figure Description

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments, wherein:

[0024] Figure 1 This is a system diagram of the heat pump unit proposed in this utility model;

[0025] Figure 2 yes Figure 1 A schematic diagram showing the refrigerant flow direction when the heat pump unit is heating.

[0026] Figure 3 yes Figure 1 The diagram shows the refrigerant flow direction during cooling by the heat pump unit.

[0027] in:

[0028] 1. Compressor, 2. Four-way valve, 3. Indoor heat exchanger, 4. Main circuit electronic expansion valve, 5. Outdoor heat exchanger, 6. Defrosting heater, 7. Fan, 8. Auxiliary circuit, 9. Auxiliary circuit electronic expansion valve, 10. Gas-liquid separator, 11. Filter. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain this utility model and do not constitute a limitation on this utility model.

[0030] The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of protection of the invention.

[0031] While techniques, methods, and devices known to those skilled in the art are not discussed in detail herein, such techniques, methods, and devices should be considered part of this specification where appropriate. Any specific values ​​in this specification should be interpreted as merely exemplary and not as limiting the scope of this invention.

[0032] For ease of description, the terms used in the specification to describe position, such as "above", "to the left of", "in front of", etc., are only used to describe the spatial positional relationship between a certain component and other components in the embodiment shown in the figure. When the position of the component is different, the relative position will change. Therefore, the positional relationship of the embodiment in the figure should not constitute a limitation on the present invention.

[0033] In addition, it needs to be explained that the words of "first", "second" and the like used in the specification are only for distinguishing similar components and there is no sequence, therefore cannot be understood as constituting a limitation to the protection scope of the utility model.

[0034] The utility model discloses a concept: through the gas makeup heat exchanger and throttling device on the auxiliary road adjustment into the compressor gas makeup port refrigerant temperature.

[0035] Figure 1 The utility model discloses a system diagram of heat pump unit. The air source heat pump unit of the utility model discloses a compressor 1, four -way valve 2, indoor heat exchanger 3, main road electronic expansion valve 4 and outdoor heat exchanger 5, and the bottom of outdoor heat exchanger is equipped with defrosting heater 6. The indoor heat exchanger and main road electronic expansion valve are equipped with a gas makeup heat exchanger 7, and the gas makeup heat exchanger and main road electronic expansion valve lead out an auxiliary road 8, and the auxiliary road is equipped with auxiliary road electronic expansion valve 9. The part refrigerant led out through auxiliary road 8 is communicated with the gas makeup port of compressor 1 after auxiliary road electronic expansion valve 9 and gas makeup heat exchanger 7.

[0036] The above embodiment, utilize auxiliary road electronic expansion valve and gas makeup heat exchanger to carry out flexible adjustment to the temperature of gas makeup, ensure that gas makeup temperature control is in reasonable range, to reduce system exhaust temperature, avoid that the compressor gas makeup temperature is too high possibly bring harm to system.

[0037] The first interface D of four -way reversing valve 2 is communicated with the exhaust pipe of compressor 1, and the second interface E is communicated with outdoor heat exchanger 5, and the third interface C is communicated with indoor heat exchanger 3, and the fourth interface S is communicated with the suction pipe of compressor 1.

[0038] Preferably, the gas makeup heat exchanger 7 adopts a plate heat exchanger.

[0039] Preferably, the outdoor heat exchanger 5 and defrosting heater 6 all adopt finned tube heat exchanger, and are equipped with fan 7. The indoor heat exchanger 3 and the gas makeup heat exchanger 7 are also equipped with filter. The compressor suction pipe is equipped with gas-liquid separator.

[0040] As another embodiment, the air source heat pump unit provided by the utility model includes a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a main path electronic expansion valve 4 and an outdoor heat exchanger 5, and a defrosting heater 6 is arranged at the bottom of the outdoor heat exchanger. A gas supplement heat exchanger 7 is arranged between the indoor heat exchanger and the main path electronic expansion valve, a branch path 8 is led out between the gas supplement heat exchanger and the main path electronic expansion valve, and a branch path electronic expansion valve 9 is arranged on the branch path. The part of refrigerant led out through the branch path 8 is communicated with the gas supplement port of the compressor 1 in sequence after passing through the defrosting heater 6, the branch path electronic expansion valve 9 and the gas supplement heat exchanger 7.

[0041] The second embodiment not only controls the gas supplement temperature of the refrigerant well, but also uses the gas supplement refrigerant to provide a heat source for the defrosting heater 6 arranged at the bottom of the outdoor heat exchanger 5, so that the ice accumulation at the bottom of the outdoor heat exchanger is well inhibited.

[0042] In the heating mode, the refrigerant is divided into two paths before throttling in the main path, one path normally passes through the main path throttling and then enters the outdoor heat exchanger 5, and the other path enters the defrosting heater 6 at the bottom of the outdoor heat exchanger, and the refrigerant flowing out after heat exchange enters the gas supplement heat exchanger through throttling, exchanges heat with the refrigerant in the main path and then enters the gas supplement port of the compressor. The flow path design can further reduce the gas supplement temperature and thus reduce the exhaust temperature of the system, and can also inhibit the ice accumulation at the bottom of the evaporator.

[0043] In the heating mode, the refrigerant flowing out of the outdoor heat exchanger 5 is divided into two paths after throttling in the main path, one path passes through the gas supplement heat exchanger 7, the indoor heat exchanger 3 and the four-way valve 2 and then returns to the compressor circulation, and the other path enters the defrosting heater 6 at the bottom of the outdoor heat exchanger and then enters the gas supplement heat exchanger 7 through throttling, exchanges heat with the refrigerant in the main path and then enters the gas supplement port of the compressor. The flow path design can further reduce the gas supplement temperature and thus reduce the exhaust temperature of the system, and can also inhibit the ice accumulation at the bottom of the evaporator.

[0044] The utility model includes two operation modes of heating and refrigeration, wherein the defrosting mode of the outdoor heat exchanger is consistent with the refrigeration mode.

[0045] Figure 2is the schematic view of refrigerant flow direction in heating of the utility model. In heating mode operation, high temperature and high pressure gaseous refrigerant after compression of compressor 1 comes out from compressor exhaust pipe and enters indoor heat exchanger 3 through four-way valve 2 after reversing, changes into high pressure liquid refrigerant after heat exchange with water, then enters air supplement heat exchanger 7, refrigerant of main road side exchanges heat with air supplement refrigerant of auxiliary road side, makes liquid refrigerant temperature reduce further, then divides into main road and auxiliary road before main road electronic expansion valve 4, refrigerant of main road directly enters outdoor heat exchanger 5 after pressure reduction and temperature reduction of main road electronic expansion valve 4, changes into low temperature and low pressure liquid refrigerant after heat exchange, then enters compressor suction side through four-way valve 2 and gas-liquid separator 10; refrigerant in auxiliary road passes through defrosting heater 6 at the bottom of outdoor heat exchanger 5, exchanges heat with air after heat exchange, then throttles through auxiliary road electronic expansion valve 9, enters air supplement heat exchanger 7 of auxiliary road side flow path after pressure reduction and temperature reduction, exchanges heat with refrigerant of main road side, changes into gaseous refrigerant after absorbing heat and finally enters compressor air supplement port.

[0046] The utility model discloses the refrigerant flow direction in refrigeration or defrosting mode as shown in the figure. Figure 3 High temperature and high pressure refrigerant of compressor 1 output comes out from compressor 1 exhaust side, enters outdoor heat exchanger after four-way valve 2, exchanges heat with air, then throttles and reduces pressure through main road electronic expansion valve 4, then divides into two flow paths of main road and auxiliary road, refrigerant of main road enters main road side of air supplement heat exchanger 7, exchanges heat with water after coming out and entering indoor heat exchanger, then enters compressor suction side through four-way valve 2 and gas-liquid separator 10; refrigerant of auxiliary road passes through defrosting heater 6 at the bottom of outdoor heat exchanger, auxiliary road electronic expansion valve 9 enters air supplement heat exchanger 7, exchanges heat with refrigerant of main road in air supplement heat exchanger and then enters compressor air supplement port.

[0047] Compared with conventional air supplement system, the utility model has the process of refrigerant temperature reduction through defrosting heater, refrigerant temperature reduction through auxiliary road electronic expansion valve and refrigerant temperature increase through air supplement heat exchanger, so the air supplement temperature control is more flexible than conventional system, ensures that the air supplement temperature is controlled in reasonable range, reduces system exhaust temperature and avoids that the high air supplement temperature of compressor can harm the system.

[0048] In addition, the utility model not only can control the exhaust temperature of compressor, but also uses air supplement refrigerant to provide heat source for defrosting heater arranged at the bottom of outdoor heat exchanger, heats ice and frost on outdoor heat exchanger through defrosting heater, and can effectively inhibit the icing at the bottom of outdoor heat exchanger.

[0049] It should be pointed out that for ordinary skilled person in the art, under the premise of not departing from the utility model concept, a plurality of deformation and change can be made, and these deformation and change should belong to the protection scope of the utility model.

Claims

1. An air source heat pump unit comprising a compressor, an indoor heat exchanger, a main path electronic expansion valve, and an outdoor heat exchanger, characterized by, A gas supplement heat exchanger is arranged between the indoor heat exchanger and the main path electronic expansion valve, and a branch path is led between the gas supplement heat exchanger and the main path electronic expansion valve, and an auxiliary path electronic expansion valve is arranged on the branch path, and the refrigerant led by the branch path is communicated with the gas supplement port of the compressor after passing through the auxiliary path electronic expansion valve and the gas supplement heat exchanger.

2. The air source heat pump unit of claim 1, wherein, The bottom of the outdoor heat exchanger is provided with a defrosting heater, and the refrigerant led by the branch path is communicated with the gas supplement port of the compressor after passing through the defrosting heater, the auxiliary path electronic expansion valve and the gas supplement heat exchanger.

3. The air source heat pump unit of claim 1, wherein, A four-way reversing valve is further arranged, the first interface of which is communicated with the exhaust pipe of the compressor, the second interface is communicated with the outdoor heat exchanger, the third interface is communicated with the indoor heat exchanger, and the fourth interface is communicated with the suction pipe of the compressor.

4. The air source heat pump unit of claim 1, wherein, The gas supplement heat exchanger is a plate heat exchanger.

5. The air source heat pump unit of claim 2, wherein, The outdoor heat exchanger and the defrosting heater are fin heat exchangers.

6. The air source heat pump unit of claim 5, wherein, The outdoor heat exchanger is provided with a fan.

7. The air source heat pump unit of claim 1, wherein, A filter is further arranged between the indoor heat exchanger and the gas supplement heat exchanger.

8. The air source heat pump unit of claim 1, wherein, A gas-liquid separator is arranged on the suction pipe of the compressor.

9. The air source heat pump unit of claim 3, wherein, In the refrigeration mode, the refrigerant is discharged from the compressor, enters the outdoor heat exchanger after passing through the four-way valve, is heat-exchanged, is throttled by the main path electronic expansion valve, is then divided into two paths, one of which returns to the compressor after passing through the gas supplement heat exchanger and the indoor heat exchanger, and the other of which enters the gas supplement port of the compressor after passing through the defrosting heater, the auxiliary path electronic expansion valve and the gas supplement heat exchanger.

10. The air source heat pump unit of claim 3, wherein, In the heating mode, the refrigerant is discharged from the compressor, enters the indoor heat exchanger after passing through the four-way valve, is heat-exchanged, is then divided into two paths after passing through the gas supplement heat exchanger, one of which is communicated with the suction pipe of the compressor after passing through the main path electronic expansion valve, the outdoor heat exchanger and the four-way valve, and the other of which is communicated with the gas supplement port of the compressor after passing through the defrosting heater, the auxiliary path electronic expansion valve and the gas supplement heat exchanger.

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