High-low temperature air inlet mechanism of water source heat pump compressor

Abstract

The utility model relates to the technical field of heating equipment, in particular to a high-low temperature air inlet mechanism of a water source heat pump compressor, which comprises a first circulating pipeline formed by sequentially connecting a compressor, a condenser, a first expansion valve and an evaporator, and is characterized in that two ends of the condenser are respectively connected with a water inlet pipe and a water outlet pipe of a hot water supply pipe; a compensation heat exchanger is further installed on a water inlet pipe of the heat supply water pipe, a second circulation pipeline is wound around the water inlet pipe in the compensation heat exchanger, the air inlet end of the second circulation pipeline is connected to the portion, between the condenser and the first expansion valve, of the first circulation pipeline, the air outlet end of the second circulation pipeline is connected to the portion, between the evaporator and the compressor, of the first circulation pipeline, and a control valve is installed at the air inlet end. A second expansion valve is installed at the air outlet end and located between the control valve and the compensation heat exchanger. Two ends of the evaporator are respectively connected with a water inlet and a water outlet of the heating medium pipeline. The compressor can be protected, meanwhile, heat waste is avoided, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heating equipment, and in particular to a high and low temperature air intake mechanism of a water source heat pump compressor. Background Art

[0002] Shallow water sources on the earth's surface, such as groundwater, surface rivers, lakes and oceans, absorb considerable radiation energy from the sun entering the earth, and the temperature of the water source is generally very stable. The working principle of water source heat pump technology is to transfer low-temperature heat energy to high-temperature heat energy by inputting a small amount of high-quality energy. The water body is used as a heat source for winter heat pump heating by "extracting" heat energy from the water source through the water source heat pump unit and sending it to the building for heating.

[0003] The existing water source heat pump uses R22 refrigerant heat pump system. Due to the characteristics of the refrigerant, the outlet water temperature is difficult to exceed 60℃. When the outlet water temperature of the R22 refrigerant water source heat pump system reaches 45℃, the refrigerant in the condenser cannot be completely liquefied. If the water temperature continues to rise, the refrigerant will not be completely liquefied. At this time, the evaporator cannot be supplied with liquid, causing the overheating temperature to rise rapidly, resulting in excessively high compressor exhaust temperature, generally reaching above 100℃. At this time, the viscosity of the lubricating oil drops rapidly, and the lubrication effect is lost, causing damage to the compressor, or even burning the compressor. If the exhaust temperature continues to rise, the control system will shut down for high temperature protection.

[0004] Chinese patent CN205807905U is a water source heat pump for increasing the outlet water temperature. The utility model discloses a water source heat pump for increasing the outlet water temperature, comprising a circulation loop composed of a compressor, a condenser, a first expansion valve, and an evaporator connected in sequence, the inlet of the condenser is connected to the return pipe of the heating system, the outlet of the condenser is connected to the outlet pipe of the heating system, the water inlet of the evaporator is connected to the return pipe of the heat medium, a compensating heat exchanger is arranged in parallel with the evaporator between the outlet of the condenser and the inlet of the compressor, a water path layer, a condensation layer and an evaporation layer are arranged inside the compensating heat exchanger, a second expansion valve is arranged on the pipelines of the condensation layer and the evaporation layer, and a control valve is arranged on the pipeline between the condenser and the compensating heat exchanger. The beneficial effects of the utility model are simple structure, high efficiency and energy saving, no energy consumption, easy maintenance, wide application range, the outlet water temperature of the heating end is greater than 60°C, and the compressor exhaust temperature does not exceed 85°C.

[0005] In the prior art, in order to completely liquefy the incompletely liquefied gas in the condenser, a compensating heat exchanger is installed at the outlet of the heat medium water to exchange heat with the gas and then directly pass it into the air inlet of the compressor, giving the compressor a lower suction temperature, and realizing high and low temperature intake with the high-temperature gas passing through the evaporator, thereby reducing the outlet water temperature of the compressor and protecting the compressor. However, the existing heat is wasted by exporting it through the heat medium outlet, so there is an urgent need for a water source heat pump that can fully utilize the heat generated by the incompletely liquefied gas. Utility Model Content

[0006] In order to overcome the problems existing in the prior art, the present application provides a high and low temperature air intake mechanism for a water source heat pump compressor.

[0007] The high and low temperature air intake mechanism of a water source heat pump compressor provided in this application adopts the following technical solution:

[0008] A high and low temperature air intake mechanism of a water source heat pump compressor comprises a first circulation pipeline which is sequentially connected by a compressor, a condenser, a first expansion valve and an evaporator, the two ends of the condenser are respectively connected to the water inlet pipe and the water outlet pipe of a hot water supply pipe, a compensating heat exchanger is also installed on the water inlet pipe of the hot water supply pipe, a second circulation pipeline is wound around the water inlet pipe in the compensating heat exchanger, the air inlet end of the second circulation pipeline is connected to the first circulation pipeline between the condenser and the first expansion valve, the air outlet end is connected between the evaporator and the compressor, a control valve is installed on the air inlet end, a second expansion valve is installed on the air outlet end, and the second expansion valve is located between the control valve and the compensating heat exchanger, and the second circulation pipeline between the second expansion valve and the compressor also passes through the end of the evaporator and is wound around a heat medium pipeline; the two ends of the evaporator are respectively connected to the water inlet and the water outlet of the heat medium pipeline.

[0009] By adopting the above technical solution, the water inlet and outlet of the heat medium pipeline connected at both ends of the evaporator absorb the heat in the heat medium pipeline and evaporate into gaseous state, and then the low-temperature and low-pressure steam in the evaporator is compressed into high-temperature and high-pressure steam by the compressor, and the high-temperature and high-pressure steam enters the condenser and releases heat to the hot water supply pipe. The high-temperature and high-pressure steam in the condenser condenses into liquid and enters the low-pressure area through the expansion valve, and enters the evaporator again for circulation. When the condenser does not completely liquefy the high-temperature and high-pressure gas, the control valve at the air inlet end of the second circulation pipeline connected between the condenser and the first expansion valve is opened, and the high-temperature and high-pressure steam enters the low-pressure area through the second expansion valve and is introduced into the compensating heat exchanger located on the water inlet pipe of the hot water supply pipe, which can transfer heat to the water inlet pipe, preheat the water entering the hot water supply pipe, and make full use of the excess heat, and then enter the low-pressure area through the second expansion valve and vaporize into low-pressure steam through the end of the evaporator, and the low-pressure steam enters the first circulation pipeline and is introduced into the compressor together.

[0010] Preferably, a first circulating water pump is installed at the water inlet of the hot water supply pipe, and a second circulating water pump is installed at the water inlet of the heat medium pipeline.

[0011] By adopting the above technical solution, the first circulating pump provides power for the water in the hot water supply pipe, and the second circulating water pump provides power for the water pipe in the heat medium pipeline.

[0012] Preferably, the heat medium in the heat medium pipeline is groundwater, well water, sewage, industrial waste water or industrial cooling water.

[0013] Preferably, the second circulation pipeline in the compensating heat exchanger is spirally wound around the hot water supply pipe inside it.

[0014] By adopting the above technical solution, the second circulation pipeline in the compensating heat exchanger is spirally wound around the hot water supply pipe inside it, which can fully exchange heat with the water in the hot water supply pipe and liquefy the steam in the second circulation pipeline.

[0015] Preferably, the compensating heat exchanger includes a shell and a front tube sheet and a rear tube sheet located at both ends of the shell, wherein the second circulation pipeline is wound inside the shell, and the two ends of the first circulation pipeline respectively pass through the front tube sheet and the rear tube sheet, and the front tube sheet and the rear tube sheet are connected to the shell by bolts.

[0016] Preferably, the shell, the front tube plate and the interior of the front tube plate are provided with a heat insulation layer.

[0017] By adopting the above technical solution, the compensating heat exchanger ensures internal heat transfer and reduces energy loss through the design of the shell and the front tube sheet and the rear tube sheet at both ends, and cooperates with the insulation layer inside.

[0018] Preferably, the control valve comprises a gas sensor and an actuator, and an indicator light is provided on the outside of the control valve.

[0019] By adopting the above technical solution, the control valve monitors the refrigerant vapor through the gas sensor, and then opens the control valve through the actuator to introduce the refrigerant vapor into the second circulation pipeline, and the control valve opening status indicator light is on.

[0020] Preferably, a temperature monitor is provided at the air outlet of the compressor, and a signal on the temperature monitor is connected to an alarm.

[0021] By adopting the above technical solution, the temperature monitor at the compressor outlet feeds back the exhaust temperature in real time. When the exhaust temperature is too high, the alarm sounds to prompt the operator to stop the machine for inspection.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. In this application, a compensating heat exchanger is installed at the outlet of the heat medium water and then directly introduced into the air inlet of the compressor, giving the compressor a lower suction temperature, and realizing high and low temperature intake with the high temperature gas passing through the evaporator, thereby reducing the outlet water temperature of the compressor and realizing the protection of the compressor;

[0024] 2. The present application sets a compensating heat exchanger on the water inlet pipe of the hot water supply pipe to preheat the hot water supply pipe, thereby avoiding heat waste and improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic diagram of the connection structure of the high and low temperature air intake mechanism of a water source heat pump compressor.

[0026] Explanation of the reference numerals in the accompanying drawings: 1. compressor; 11. temperature monitor; 12. alarm; 2. condenser; 3. first expansion valve; 4. evaporator; 5. first circulation pipeline; 6. hot water supply pipe; 61. water inlet pipe; 62. water outlet pipe; 63. first circulation water pump; 7. compensating heat exchanger; 71. shell; 72. front tube sheet; 73. rear tube sheet; 8. second circulation pipeline; 81. control valve; 811. indicator light; 82. second expansion valve; 9. heat medium pipeline; 91. second circulation water pump. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1 This application is described in further detail.

[0028] The embodiment of the present application discloses a high and low temperature air intake mechanism of a water source heat pump compressor.

[0029] Reference Figure 1A high and low temperature air intake mechanism of a water source heat pump compressor 1 comprises a first circulation pipeline 5 which is sequentially connected by a compressor 1, a condenser 2, a first expansion valve 3 and an evaporator 4, the two ends of the condenser 2 are respectively connected to a water inlet pipe 61 and a water outlet pipe 62 of a hot water supply pipe 6, a compensating heat exchanger 7 is also installed on the water inlet pipe 61 of the hot water supply pipe 6, a second circulation pipeline 8 is wound around the water inlet pipe 61 in the compensating heat exchanger 7, an air inlet end of the second circulation pipeline 8 is connected to the first circulation pipeline 5 between the condenser 2 and the first expansion valve 3, an air outlet end is connected between the evaporator 4 and the compressor 1, a control valve 81 is installed on the air inlet end, a second expansion valve 82 is installed on the air outlet end, and the second expansion valve 82 is located between the control valve 81 and the compensating heat exchanger 7, and the second circulation pipeline 8 between the second expansion valve 82 and the compressor 1 also passes through the end of the evaporator 4 and is wound around a heat medium pipeline 9; the two ends of the evaporator 4 are respectively connected to the water inlet and the water outlet of the heat medium pipeline 9. The water inlet and outlet of the heat medium pipe 9 connected at both ends of the evaporator 4 will absorb the heat in the heat medium pipe 9 and evaporate into gas after the refrigerant passing through the evaporator 4. Then, the low-temperature and low-pressure steam in the evaporator 4 will be compressed into high-temperature and high-pressure steam through the compressor 1. After the high-temperature and high-pressure steam enters the condenser 2, it releases heat to the hot water supply pipe 6. The high-temperature and high-pressure steam in the condenser 2 is condensed into liquid and enters the low-pressure area through the expansion valve, and then enters the evaporator 4 again for circulation. When the condenser 2 has not completely liquefied the high-temperature and high-pressure gas, the control valve 81 at the air inlet end of the second circulation pipeline 8 connected between the condenser 2 and the first expansion valve 3 is opened, and the high-temperature and high-pressure steam enters the low-pressure area through the second expansion valve 82 and is introduced into the compensating heat exchanger 7 located on the water inlet pipe 61 of the hot water supply pipe 6, which can transfer heat to the water inlet pipe 61 to preheat the water entering the hot water supply pipe 6 and make full use of the excess heat. After that, the water enters the low-pressure area through the second expansion valve 82 and is vaporized into low-pressure steam through the end of the evaporator 4. The low-pressure steam enters the first circulation pipeline and is introduced into the compressor 1 together.

[0030] Reference Figure 1 The water inlet of the hot water supply pipe 6 is equipped with a first circulating water pump 63, and the water inlet of the heat medium pipe 9 is equipped with a second circulating water pump 91. The first circulating pump provides power for the water in the hot water supply pipe 6, and the second circulating water pump provides power for the water pipe in the heat medium pipe 9.

[0031] Reference Figure 1 The heat medium in the heat medium pipe 9 is groundwater, well water, sewage, industrial wastewater or industrial cooling water. The second circulation pipeline 8 in the compensating heat exchanger 7 is spirally wound on the hot water supply pipe 6 inside it. The second circulation pipeline 8 in the compensating heat exchanger 7 is spirally wound on the hot water supply pipe 6 inside it, which can fully exchange heat with the water in the hot water supply pipe 6 to liquefy the steam in the second circulation pipeline 8.

[0032] Reference Figure 1 The compensating heat exchanger 7 includes a shell 71 and a front tube sheet 72 and a rear tube sheet 73 located at both ends of the shell 71, wherein the second circulation pipeline 8 is wound inside the shell 71, and both ends of the first circulation pipeline respectively penetrate the front tube sheet 72 and the rear tube sheet 73, and the front tube sheet 72 and the rear tube sheet 73 are connected to the shell 71 by bolts. The shell 71, the front tube sheet 72 and the interior of the front tube sheet 72 are provided with a heat insulation layer. The compensating heat exchanger 7 ensures heat transfer inside the shell 71 and reduces energy loss through the design of the front tube sheet 72 and the rear tube sheet 73 at both ends of the shell 71 and the heat insulation layer inside the shell 71.

[0033] Reference Figure 1 The control valve 81 includes a gas sensor and an actuator, and an indicator light 811 is provided on the outside of the control valve 81. The control valve 81 detects the refrigerant vapor through the gas sensor, and then opens the control valve 81 through the actuator to introduce the refrigerant vapor into the second circulation pipeline 8, and the indicator light 811 of the open state of the control valve 81 lights up.

[0034] Reference Figure 1 A temperature monitor 11 is provided at the air outlet of the compressor 1, and an alarm 12 is connected to the temperature monitor 11. The temperature monitor 11 at the air outlet of the compressor 1 feeds back the exhaust temperature in real time. When the exhaust temperature is too high, the alarm 12 sounds an alarm to prompt the operator to stop the machine for inspection.

[0035] Working principle: the water inlet and outlet of the heat medium pipe 9 connected at both ends of the evaporator 4 will absorb the heat in the heat medium pipe 9 and evaporate into gaseous state, and then the low-temperature and low-pressure steam in the evaporator 4 will be compressed into high-temperature and high-pressure steam through the compressor 1. After the high-temperature and high-pressure steam enters the condenser 2, it releases heat to the hot water supply pipe 6. The high-temperature and high-pressure steam in the condenser 2 is condensed into liquid and enters the low-pressure area through the expansion valve, and then enters the evaporator 4 again for circulation. When the condenser 2 has not completely liquefied the high-temperature and high-pressure gas, the control valve 81 at the air inlet end of the second circulation pipeline 8 connected between the condenser 2 and the first expansion valve 3 is opened, and the high-temperature and high-pressure steam enters the low-pressure area through the second expansion valve 82 and is introduced into the compensating heat exchanger 7 located on the water inlet pipe 61 of the hot water supply pipe 6, which can transfer heat to the water inlet pipe 61 to preheat the water entering the hot water supply pipe 6 and make full use of the excess heat. After that, the water enters the low-pressure area through the second expansion valve 82 and is vaporized into low-pressure steam through the end of the evaporator 4. The low-pressure steam enters the first circulation pipeline and is introduced into the compressor 1 together.

[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high and low temperature air intake mechanism of a water source heat pump compressor, comprising a first circulation pipeline (5) composed of a compressor (1), a condenser (2), a first expansion valve (3), and an evaporator (4) connected in sequence, characterized in that: The two ends of the condenser (2) are respectively connected to the water inlet pipe (61) and the water outlet pipe (62) of the hot water supply pipe (6); a compensating heat exchanger (7) is also installed on the water inlet pipe (61) of the hot water supply pipe (6); a second circulation pipeline (8) is installed around the water inlet pipe (61) in the compensating heat exchanger (7); the air inlet end of the second circulation pipeline (8) is connected to the first circulation pipeline (5) between the condenser (2) and the first expansion valve (3); and the air outlet end of the second circulation pipeline (8) is connected to the evaporator (4). and the compressor (1), a control valve (81) being installed on the air inlet end, a second expansion valve (82) being installed on the air outlet end, and the second expansion valve (82) being located between the control valve (81) and the compensating heat exchanger (7), and a second circulation pipeline (8) between the second expansion valve (82) and the compressor (1) also passes through the end of the evaporator (4) and is wound around the heat medium pipeline (9); the two ends of the evaporator (4) are respectively connected to the water inlet and the water outlet of the heat medium pipeline (9).

2. The high and low temperature air intake mechanism of a water source heat pump compressor according to claim 1, characterized in that: A first circulating water pump (63) is installed at the water inlet of the hot water supply pipe (6), and a second circulating water pump (91) is installed at the water inlet of the heat medium pipeline (9).

3. The high and low temperature air intake mechanism of a water source heat pump compressor according to claim 2, characterized in that: The heat medium in the heat medium pipeline (9) is groundwater, well water, sewage, industrial waste water or industrial cooling water.

4. The high and low temperature air intake mechanism of a water source heat pump compressor according to claim 1, characterized in that: The second circulation pipeline (8) in the compensating heat exchanger (7) is spirally wound around the hot water supply pipe (6) inside the compensating heat exchanger (7).

5. The high and low temperature air intake mechanism of the water source heat pump compressor according to claim 4, characterized in that: The compensating heat exchanger (7) comprises a shell (71) and a front tube sheet (72) and a rear tube sheet (73) located at two ends of the shell (71), wherein the second circulation pipeline (8) is wound inside the shell (71), and two ends of the first circulation pipeline respectively penetrate the front tube sheet (72) and the rear tube sheet (73), and the front tube sheet (72) and the rear tube sheet (73) are connected to the shell (71) by bolts.

6. The high and low temperature air intake mechanism of the water source heat pump compressor according to claim 5, characterized in that: The shell (71), the front tube plate (72) and the interior of the front tube plate (72) are provided with a heat insulation layer.

7. The high and low temperature air intake mechanism of the water source heat pump compressor according to claim 1, characterized in that: The control valve (81) comprises a gas sensor and an actuator, and an indicator light (811) is provided on the outside of the control valve (81).

8. The high and low temperature air intake mechanism of a water source heat pump compressor according to claim 1, characterized in that: A temperature monitor (11) is provided at the air outlet of the compressor (1), and an alarm (12) is connected to the signal of the temperature monitor (11).

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