Two-stage compressed air source heat pump structure

Abstract

The utility model relates to the technical field of air source heat pumps, in particular to a two-stage compressed air source heat pump structure which comprises a first compressor, the output end of the first compressor is fixedly connected with a first connecting pipe, the end, away from the first compressor, of the first connecting pipe is fixedly connected with a heating mechanism, and the heating mechanism is arranged in a heating water tank; when the temperature detector detects that the temperature of gas about to enter the square heat conduction pipe on the right side is low, the first electromagnetic valve is controlled to be closed, so that the low-temperature gas cannot enter the square heat conduction pipe on the right side any more; low-temperature gas or liquid in the square heat conduction pipe on the left side is pumped out through opening of the compression mechanism and compressed and heated again, the heated gaseous refrigerant enters the processing mechanism to be processed and then enters the first compressor again, two-stage compression is achieved through the arrangement of the two compressors, and the working efficiency is improved. And a water source in the water tank can be rapidly heated when the environment temperature is low.

Description

Technical Field

[0001] The utility model relates to the technical field of air source heat pumps, in particular to a two-stage compressed air source heat pump structure. Background Art

[0002] For example, the Chinese patent with the announcement number CN2530221Y discloses a two-stage compression low-temperature heat pump device suitable for use in cold areas. It is a conventional heat pump device including a compressor, a four-way valve, a refrigerant / air heat exchanger, a thermal expansion valve, a one-way valve, a high-pressure liquid storage tank, a drying filter, a refrigerant / water heat exchanger and / or a refrigerant / air heat exchanger, a gas-liquid separator, a water pump and / or a fan, and a refrigerant and water connection pipe. A high-pressure compressor, a high-pressure four-way valve, an intermediate throttling thermal expansion valve, and a solenoid valve are added to the refrigerant circuit of the device.

[0003] However, the above scheme has the following shortcomings: in the above patent, the single-stage compression refrigeration cycle is converted into a multi-stage compression refrigeration cycle through the setting of two groups of compressors, which effectively increases the heating capacity of the heat pump device. However, during use, when the external ambient temperature is low, the temperature of the water source in the water tank located in the water tank will also be low. At this time, when the high-temperature and high-pressure gaseous refrigerant enters the water source in the water tank for heating, it may experience rapid cooling due to the low temperature of the water source. The cooled gas can only be compressed and heated again after coming out of the water tank to heat the water source in the water tank. This makes the heating speed of the water source in the water tank too slow when the ambient temperature is low, and it is impossible to achieve rapid heating of the water source in cold weather. For this reason, we have introduced a two-stage compressed air source heat pump structure. Utility Model Content

[0004] The purpose of the utility model is to provide a two-stage compressed air source heat pump structure to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A two-stage compressed air source heat pump structure includes a first compressor, an output end of the first compressor is fixedly connected to a first connecting pipe, the first connecting pipe is fixedly connected to a heating mechanism at one end away from the first compressor, the heating mechanism is arranged in a heating water tank, the refrigerant is compressed by the first compressor, the compressed refrigerant enters the heating mechanism through the first connecting pipe to heat the water source in the heating water tank, a compression mechanism is provided on one side of the heating water tank, the compression mechanism is connected to the heating mechanism, the refrigerant entering the heating mechanism is compressed and heated again by the compression mechanism, and then sent back to the heating mechanism, the input end of the first compressor is fixedly connected to a processing mechanism, the processing mechanism is fixedly connected to the heating mechanism at one end away from the first compressor, the gaseous refrigerant discharged from the heating mechanism is processed by the processing mechanism, and the processed gaseous refrigerant is re-input into the first compressor.

[0007] Preferably, the heating mechanism comprises two groups of square heat-conducting tubes, and the two groups of square heat-conducting tubes are fixedly installed in the heating water tank. The upper end of one group of square heat-conducting tubes extends out of the heating water tank and is fixedly connected to the first connecting tube, and the upper end of the other group of square heat-conducting tubes extends out of the heating water tank and is fixedly connected to the processing mechanism. Several groups of heat-conducting plates are fixedly connected in the two groups of square heat-conducting tubes, one end of the heat-conducting plate extends into the square heat-conducting tube, and the other end extends into the heating water tank. The lower ends of the two groups of square heat-conducting tubes extend into the external environment and are fixedly connected to the first solenoid valve.

[0008] Preferably, a temperature detector is fixedly installed in the square heat-conducting tube on the left, and the lower ends of the two groups of square heat-conducting tubes are fixedly connected to second solenoid valves, and the output end of the second solenoid valve on the left is fixedly connected to the input end of the first water pump.

[0009] Preferably, the compression mechanism includes a second compressor, the input end of the second compressor is fixedly connected to the output end of the first gas-liquid separator, the input end of the first gas-liquid separator is fixedly connected to the output end of the first air heat exchanger, the input end of the first air heat exchanger is fixedly connected to the output end of the first filter-expander, the input end of the first filter-expander is fixedly connected to the output end of the first water pump, the output end of the second compressor is fixedly connected to a second connecting pipe, and the end of the second connecting pipe away from the second compressor is fixedly connected to the second solenoid valve on the right.

[0010] Preferably, the processing mechanism includes a high-pressure liquid reservoir, the input end of the high-pressure liquid reservoir is fixedly connected to the upper end of the square heat conduction tube on the right, the output end of the high-pressure liquid reservoir is fixedly connected to the input end of the second filter-expander, the output end of the second filter-expander is fixedly connected to the input end of the second air heat exchanger, the output end of the second air heat exchanger is fixedly connected to the input end of the second gas-liquid separator, and the output end of the second gas-liquid separator is fixedly connected to the input end of the first compressor.

[0011] Preferably, a second water pump is fixedly installed on one side of the heating water tank, and a liquid guide tube is fixedly connected to the output end of the second water pump. The end of the liquid guide tube away from the second water pump is fixedly connected to the other side of the heating water tank.

[0012] Compared with the prior art, the utility model has the following beneficial effects: when the temperature detector detects that the temperature of the gas about to enter the square heat pipe on the right is low, the first solenoid valve is controlled to close, so that the low-temperature gas can no longer enter the square heat pipe on the right; the low-temperature gas or liquid in the square heat pipe on the left is extracted and compressed and heated again by opening the compression mechanism; the high-temperature and high-pressure gaseous refrigerant after compression and heating will enter the square heat pipe on the right to heat the water source in the water tank again; after heating, the gaseous refrigerant enters the processing mechanism for processing, and then enters the first compressor again; two-stage compression is achieved by setting two sets of compressors, so that the water source in the water tank can be quickly heated when the ambient temperature is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of the heating water tank of the utility model;

[0015] Figure 3 This is a schematic diagram of the main structure of the heating water tank of the utility model.

[0016] In the figure: 1. first compressor; 2. first connecting pipe; 3. square heat pipe; 4. liquid pipe; 5. second water pump; 6. heating water tank; 7. second connecting pipe; 8. second compressor; 9. first gas-liquid separator; 10. first air heat exchanger; 11. first filter-expander; 12. temperature detector; 13. high-pressure liquid storage tank; 14. second filter-expander; 15. second gas-liquid separator; 16. second air heat exchanger; 17. first water pump; 18. first solenoid valve; 19. second solenoid valve; 20. heat transfer plate. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-3 , the utility model provides a technical solution:

[0019] Embodiment 1:

[0020] A two-stage compressed air source heat pump structure comprises a first compressor 1, an output end of the first compressor 1 is fixedly connected with a first connecting pipe 2, an end of the first connecting pipe 2 away from the first compressor 1 is fixedly connected with a heating mechanism, the heating mechanism is arranged in a heating water tank 6, by opening the first compressor 1, a low-temperature and low-pressure gaseous refrigerator is compressed into a high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant enters the heating mechanism through the first connecting pipe 2, the water source in the heating water tank 6 is heated by the heated heating mechanism, a compression mechanism is arranged on one side of the heating water tank 6, the compression mechanism is connected with the heating mechanism, the refrigerant entering the heating mechanism is compressed and heated again by the compression mechanism, and is then re-sent into the heating mechanism, an input end of the first compressor 1 is fixedly connected with a processing mechanism, an end of the processing mechanism away from the first compressor 1 is fixedly connected with the heating mechanism, the gaseous refrigerant discharged from the heating mechanism is processed by the processing mechanism, and the processed gaseous refrigerant is re-input into the first compressor 1.

[0021] Embodiment 2:

[0022] On the basis of Example 1, in order to enable the water source in the heating water tank 6 to be quickly heated, the heating mechanism includes two groups of square heat-conducting tubes 3, and the two groups of square heat-conducting tubes 3 are fixedly installed in the heating water tank 6. The upper end of one group of square heat-conducting tubes 3 extends out of the heating water tank 6 and is fixedly connected to the first connecting tube 2, and the upper end of the other group of square heat-conducting tubes 3 extends out of the heating water tank 6 and is fixedly connected to the processing mechanism. Several groups of heat-conducting plates 20 are fixedly connected in the two groups of square heat-conducting tubes 3, one end of the heat-conducting plate 20 extends into the square heat-conducting tube 3, and the other end extends into the heating water tank 6. The multiple groups of heat-conducting plates 20 are arranged in sequence in a stepped manner, so that an S-shaped flow channel is formed in the square heat-conducting tube 3. The lower ends of the two groups of square heat-conducting tubes 3 extend into the external environment and are fixedly connected to the first solenoid valve 18. After the high-temperature and high-pressure gaseous refrigerant contacts the several groups of heat-conducting plates 20 in the square heat-conducting tube 3, the heat is transferred to the heat-conducting plates 20, and the water source in the heating water tank 6 is heated by the heated heat-conducting plates 20;

[0023] A temperature detector 12 is fixedly installed in the left square heat-conducting tube 3, and the lower ends of the two groups of square heat-conducting tubes 3 are fixedly connected to the second solenoid valve 19, and the output end of the left second solenoid valve 19 is fixedly connected to the input end of the first water pump 17. When the temperature of the external environment is low, the water source temperature in the heating water tank 6 is low. At this time, the high-temperature and high-pressure gaseous refrigerant will be cooled and condensed when it enters a group of square heat-conducting tubes 3. When the temperature detector 12 detects that the temperature of the gas or liquid passing through the square heat-conducting tube 3 is low, the first solenoid valve 18 is closed, so that the liquid or gas in the left square heat-conducting tube 3 cannot enter the right square heat-conducting tube 3, and at the same time, the two groups of second solenoid valves 19 are opened and the first water pump 17 is opened;

[0024] The compression mechanism includes a second compressor 8, the input end of the second compressor 8 is fixedly connected to the output end of the first gas-liquid separator 9, the input end of the first gas-liquid separator 9 is fixedly connected to the output end of the first air heat exchanger 10, the input end of the first air heat exchanger 10 is fixedly connected to the output end of the first filter expander 11, the input end of the first filter expander 11 is fixedly connected to the output end of the first water pump 17, the output end of the second compressor 8 is fixedly connected with a second connecting pipe 7, and the end of the second connecting pipe 7 away from the second compressor 8 is fixedly connected to the second solenoid valve 19 on the right side. When the first water pump 17 is turned on, the low-temperature gas or liquid in the square heat pipe 3 on the left is drawn into the first filter expander 11, and then enters the first air heat exchanger 10 and the first gas-liquid separator 9 in sequence, and finally enters the second compressor 8 for re-compression. The compressed high-temperature and high-pressure gaseous refrigerant re-enters the square heat pipe 3 on the right through the second connecting pipe 7 to heat the water source in the heating water tank 6 again;

[0025] The processing mechanism includes a high-pressure liquid reservoir 13, an input end of the high-pressure liquid reservoir 13 is fixedly connected to the upper end of the square heat pipe 3 on the right, an output end of the high-pressure liquid reservoir 13 is fixedly connected to the input end of the second filter expander 14, the output end of the second filter expander 14 is fixedly connected to the input end of the second air heat exchanger 16, the output end of the second air heat exchanger 16 is fixedly connected to the input end of the second gas-liquid separator 15, the output end of the second gas-liquid separator 15 is fixedly connected to the input end of the first compressor 1, a second water pump 5 is fixedly installed on one side of the heating water tank 6, by turning on the second water pump 5, the heated hot water in the heating water tank 6 can be pumped into the liquid conduit 4, and the hot water pumped into the liquid conduit 4 will return to the heating water tank 6, the output end of the second water pump 5 is fixedly connected to the liquid conduit 4, and the end of the liquid conduit 4 away from the second water pump 5 is fixedly connected to the other side of the heating water tank 6.

[0026] Working principle: when in use, the first compressor 1 is turned on to compress the low-temperature and low-pressure gaseous refrigerator into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant enters the square heat-conducting tube 3 on the left through the first connecting tube 2. After the high-temperature and high-pressure gaseous refrigerant contacts with a plurality of groups of heat-conducting plates 20 in the square heat-conducting tube 3, the heat is transferred to the heat-conducting plates 20. The water source in the heating water tank 6 is heated by the heated heat-conducting plates 20. The gaseous refrigerant comes out of the square heat-conducting tube 3 on the right and enters the high-pressure liquid storage tank 13. Condensed into a supercooled high-pressure liquid, the high-pressure liquid refrigerant flowing out of the high-pressure liquid storage tank 13 flows through the second filter expander 14, which is provided with a drying filter and a thermal expansion valve. The liquid coming out of the second filter expander 14 is throttled and depressurized to become a low-temperature and low-pressure liquid and gaseous mixed refrigerant, and then enters the second air heat exchanger 16, where the liquid refrigerant absorbs the heat of the outdoor air and evaporates into a low-temperature and low-pressure gaseous refrigerant, and then passes through the second gas-liquid separator 15 and enters the first compressor 1 to complete the heating cycle;

[0027] When the temperature of the external environment is low, the water source temperature in the heating water tank 6 is low. At this time, the high-temperature and high-pressure gaseous refrigerant will be cooled and condensed when it enters a group of square heat-conducting tubes 3. When the temperature detector 12 detects that the temperature of the gas or liquid passing through the square heat-conducting tube 3 is low, the first solenoid valve 18 is closed, so that the liquid or gas in the left square heat-conducting tube 3 cannot enter the right square heat-conducting tube 3. At the same time, the two groups of second solenoid valves 19 are opened and the first water pump 17 is opened. After the first water pump 17 is turned on, the square heat-conducting tube 3 on the left is closed. The low-temperature gas or liquid in the square heat pipe 3 is drawn into the first filter expander 11, and then enters the first air heat exchanger 10 and the first gas-liquid separator 9 in sequence, and finally enters the second compressor 8 for compression again. The compressed high-temperature and high-pressure gaseous refrigerant re-enters the square heat pipe 3 on the right through the second connecting pipe 7 to heat the water source in the heating water tank 6 again. The high-temperature and high-pressure gaseous refrigerant passing through the square heat pipe 3 on the right will re-enter the high-pressure liquid storage tank 13, and finally enter the first compressor 1 for compression again.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A two-stage compressed air source heat pump structure, comprising a first compressor, characterized in that: A first connecting pipe is fixedly connected to the output end of the first compressor, and the end of the first connecting pipe away from the first compressor is fixedly connected to the heating mechanism. The heating mechanism is arranged in the heating water tank, and the refrigerant is compressed by the first compressor, and the compressed refrigerant enters the heating mechanism through the first connecting pipe to heat the water source in the heating water tank. A compression mechanism is provided on one side of the heating water tank, and the compression mechanism is connected to the heating mechanism. The refrigerant entering the heating mechanism is compressed and heated again by the compression mechanism and then sent back to the heating mechanism. A processing mechanism is fixedly connected to the input end of the first compressor, and the processing mechanism is fixedly connected to the heating mechanism at one end away from the first compressor. The gaseous refrigerant discharged from the heating mechanism is processed by the processing mechanism, and the processed gaseous refrigerant is re-input into the first compressor.

2. A two-stage compressed air source heat pump structure according to claim 1, characterized in that: The heating mechanism includes two groups of square heat-conducting tubes, and the two groups of square heat-conducting tubes are fixedly installed in the heating water tank. The upper end of one group of square heat-conducting tubes extends out of the heating water tank and is fixedly connected to the first connecting tube, and the upper end of the other group of square heat-conducting tubes extends out of the heating water tank and is fixedly connected to the processing mechanism. Several groups of heat-conducting plates are fixedly connected in the two groups of square heat-conducting tubes, one end of the heat-conducting plate extends into the square heat-conducting tube, and the other end extends into the heating water tank. The lower ends of the two groups of square heat-conducting tubes extend into the external environment and are fixedly connected to the first solenoid valve.

3. A two-stage compressed air source heat pump structure according to claim 2, characterized in that: A temperature detector is fixedly installed in the square heat-conducting tube on the left side, and the lower ends of the two groups of square heat-conducting tubes are fixedly connected to second solenoid valves, and the output end of the second solenoid valve on the left side is fixedly connected to the input end of the first water pump.

4. A two-stage compressed air source heat pump structure according to claim 3, characterized in that: The compression mechanism includes a second compressor, the input end of the second compressor is fixedly connected to the output end of the first gas-liquid separator, the input end of the first gas-liquid separator is fixedly connected to the output end of the first air heat exchanger, the input end of the first air heat exchanger is fixedly connected to the output end of the first filter-expander, the input end of the first filter-expander is fixedly connected to the output end of the first water pump, the output end of the second compressor is fixedly connected to a second connecting pipe, and the end of the second connecting pipe away from the second compressor is fixedly connected to the second solenoid valve on the right.

5. A two-stage compressed air source heat pump structure according to claim 4, characterized in that: The processing mechanism includes a high-pressure liquid reservoir, an input end of the high-pressure liquid reservoir is fixedly connected to the upper end of the square heat conduction tube on the right side, an output end of the high-pressure liquid reservoir is fixedly connected to the input end of the second filter expander, an output end of the second filter expander is fixedly connected to the input end of the second air heat exchanger, an output end of the second air heat exchanger is fixedly connected to the input end of the second gas-liquid separator, and an output end of the second gas-liquid separator is fixedly connected to the input end of the first compressor.

6. A two-stage compressed air source heat pump structure according to claim 1, characterized in that: A second water pump is fixedly installed on one side of the heating water tank, and a liquid guide tube is fixedly connected to the output end of the second water pump. The end of the liquid guide tube away from the second water pump is fixedly connected to the other side of the heating water tank.

Images