A liquid-filled air source heat pump system

Abstract

The present invention relates to the technical field of heat pump systems, and discloses a full-liquid air source heat pump system, including a first compressor, a second oil return solenoid valve, a high and low pressure gauge, a gas-liquid separator and a second compressor, wherein the first compressor is connected to the second compressor through an oil balance pipe; the first compressor is connected to an oil separator through a pipeline, and the oil separator is connected to a pipeline connected between the first compressor and the second compressor through a pipeline; the first compressor and the oil separator are connected through a pipeline, and an intake temperature sensor, a low pressure sensor and a first oil return solenoid valve are fixedly installed on the pipeline between the first compressor and the oil separator. The present invention eliminates dead water areas and has low flow resistance; the use of high-efficiency heat exchange pipes can increase the large heat transfer area, reduce the heat transfer temperature difference, and the heat exchange efficiency is higher than that of traditional air source heat pump equipment; the water side has good fluidity, is not easy to scale, and is easy to clean and descale; and is convenient for maintenance.

Description

Technical Field

[0001] This invention relates to the field of heat pump systems, and more particularly to a flooded air source heat pump system. Background Technology

[0002] Air source heat pumps typically employ plate heat exchangers, shell-and-tube dry heat exchangers, and coaxial heat exchangers. In recent years, high-efficiency tank heat exchangers have also been used. However, these structures are prone to scaling and are difficult to clean for projects requiring long-term heating or hot water supply. Currently, the main challenge for air source heat pumps is no longer defrosting in winter, but rather the severe scaling problem. Scale buildup in heat pump units significantly impacts their operating efficiency.

[0003] Plate heat exchangers have small flow channels, making them prone to clogging and requiring high water quality. Shell-and-tube dry heat exchangers and coaxial heat exchangers have a structure where refrigerant flows inside the tubes and water flows outside; these heat exchangers are prone to scaling and are difficult to clean. High-efficiency tank heat exchangers have coiled heat exchange tubes, which have poor flowability and are also prone to scaling.

[0004] To address the aforementioned issues, this application proposes a flooded air source heat pump system. Summary of the Invention

[0005] (I) Purpose of the Invention

[0006] To address the technical problems existing in the background art, this invention proposes a flooded air source heat pump system. This invention eliminates dead water zones and has low flow resistance; the use of high-efficiency heat exchange tubes can increase the heat transfer area, reduce the heat transfer temperature difference, and the heat exchange efficiency is higher than that of traditional air source heat pump equipment; the water side has good flowability, is not prone to scaling, and is easy to clean and remove scale; maintenance is convenient.

[0007] (II) Technical Solution

[0008] To address the aforementioned problems, this invention provides a flooded air source heat pump system, comprising a first compressor, a second oil return solenoid valve, high and low pressure gauges, a gas-liquid separator, and a second compressor, wherein the first compressor is connected to the second compressor via an oil balance pipe.

[0009] The first compressor is connected to an oil separator via a pipeline, and the oil separator is connected to the pipeline between the first compressor and the second compressor via a pipeline.

[0010] The first compressor and the oil separator are connected by a pipeline, and a suction temperature sensor, a low pressure sensor and a first oil return solenoid valve are fixedly installed on the pipeline between the first compressor and the oil separator.

[0011] The oil separator is connected to a four-way reversing valve via a pipeline, and the second oil return solenoid valve is connected to a venturi device via a pipeline. The venturi device is connected to the pipeline between the first compressor, the second oil return solenoid valve, and the suction main of the second compressor via pipelines. The high and low pressure gauges are installed on the pipeline between the oil separator and the second oil return solenoid valve via pipelines, and are connected to the pipeline installed between the gas-liquid separator and the suction main of the first compressor and the second compressor.

[0012] The Venturi device is connected to a flooded heat exchanger via a pipeline. The flooded heat exchanger is connected to a four-way reversing valve via a pipeline and is also connected to a first check valve. The four-way reversing valve is connected to a gas-liquid separator via a pipeline. The gas-liquid separator is connected to an oil separator and a second return oil solenoid valve via a pipeline.

[0013] The gas-liquid separator is connected to a four-way directional valve via a pipeline. The gas-liquid separator is also connected to a first return oil solenoid valve via a pipeline. The four-way directional valve is connected to a finned heat exchanger via a pipeline. The finned heat exchanger is connected to a return oil pipeline. A fourth check valve and a third check valve are connected to the finned heat exchanger via pipelines. The fourth check valve is connected to a first check valve via a pipeline. The fourth check valve is connected to a liquid reservoir via a pipeline. The liquid reservoir is connected to a filter via a pipeline. The filter is connected to a throttling device via a pipeline. The third check valve is connected to a second check valve via a pipeline. The throttling device is connected to the pipeline between the third and second check valves via a pipeline. The second check valve is connected to the pipeline between the first check valve and the flooded heat exchanger via a pipeline.

[0014] Preferably, the flooded heat exchanger is provided with a first oil return port and a second oil return port, and the first oil return port and the second oil return port are connected to the Venturi device through pipelines.

[0015] Preferably, the finned heat exchanger is equipped with a fan, and multiple fans are provided.

[0016] Preferably, a ball valve is installed on the pipeline between the liquid reservoir and the filter.

[0017] Preferably, a pressure balancing pipeline is connected to the pipeline between the fourth check valve and the first check valve, and the other end of the pressure balancing pipeline is connected to the pipeline between the oil separator and the second return oil solenoid valve.

[0018] Preferably, a fin temperature sensor is installed on the fins of the finned heat exchanger.

[0019] Preferably, an ambient temperature sensor is installed on the finned heat exchanger.

[0020] Preferably, a high-pressure sensor and an exhaust temperature sensor are installed on the pipeline between the oil separator and the first compressor and the second compressor.

[0021] Preferably, the flooded heat exchanger is provided with a flooded heat exchanger inlet, and the flooded heat exchanger inlet is connected to the first one-way valve through a pipeline.

[0022] The above-described technical solution of the present invention has the following beneficial technical effects:

[0023] 1. The compressor can be used as a single unit or multiple compressors connected in parallel. The compressor can be a scroll compressor or a screw compressor.

[0024] 2. The application of flooded heat exchangers in air source heat pumps improves the operating efficiency of the unit and simplifies cleaning and descaling.

[0025] 3. Add an oil separator device and a flooded heat exchanger oil return pipeline to ensure stable oil return to the compressor and extend its service life.

[0026] 4. Flooded heat exchangers are used as condensers in heating mode and as evaporators in cooling mode.

[0027] 5. The pressure drop on both the water side and the refrigerant side of the flooded air source heat pump is relatively low, eliminating dead water zones and reducing flow resistance; the flooded heat exchanger reduces the heat transfer temperature difference, and the flooded heat exchanger structure has good water flow, is not prone to scaling, and is easy to clean, descale, and maintain. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a flooded air source heat pump system proposed in this invention.

[0029] Figure reference numerals: 101, First compressor; 102, Oil balance pipe; 103, Second compressor; 104, Suction temperature sensor; 105, Low-pressure sensor; 106, First return oil solenoid valve; 107, High and low pressure gauges; 108, Flooded heat exchanger; 109, First return oil port; 201, Second return oil port; 202, Flooded heat exchanger inlet; 203, Venturi device; 204, Second return oil solenoid valve; 205, First check valve; 206, Liquid receiver; 20 7. Second check valve; 208. Third check valve; 209. Ambient temperature sensor; 301. Finned temperature sensor; 302. Throttling device; 303. Filter; 304. Ball valve; 305. Oil return line; 306. Fan; 307. Finned heat exchanger; 308. Gas-liquid separator; 309. Fourth check valve; 401. Pressure balancing line; 402. Four-way directional valve; 403. Oil separator; 404. High pressure sensor; 405. Exhaust temperature sensor. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0031] like Figure 1 As shown, the present invention proposes a flooded air source heat pump system, including a first compressor 101, a second oil return solenoid valve 204, a high and low pressure gauge 107, a gas-liquid separator 308 and a second compressor 103. The first compressor 101 is connected to the second compressor 103 through an oil balance pipe 102.

[0032] The first compressor 101 is connected to an oil separator 403 via a pipeline, and the oil separator 403 is connected to the pipeline connecting the first compressor 101 and the second compressor 103 via a pipeline.

[0033] The first compressor 101 is connected to the oil separator 403 by a pipeline, and the first compressor 101 and the oil separator 403 are respectively fixedly installed on the pipeline.

[0034] The oil separator 403 is connected to a four-way reversing valve 402 via a pipeline. The second oil return solenoid valve 204 is connected to a venturi device 203 via a pipeline. The venturi device 203 is connected to the first compressor 101, the second oil return solenoid valve 204, and the suction main of the second compressor 103 via pipelines. The high and low pressure gauges 107 are installed on the pipeline between the oil separator 403 and the second oil return solenoid valve 204 via a pipeline, and are connected to the pipeline installed between the gas-liquid separator 308 and the suction main of the first compressor 101 and the second compressor 103.

[0035] The Venturi device 203 is connected to a flooded heat exchanger 108 via a pipeline. The flooded heat exchanger 108 is connected to a four-way directional valve 402 via a pipeline and is also connected to a first check valve 205. The four-way directional valve 402 is connected to a gas-liquid separator 308 via a pipeline. The gas-liquid separator 308 is connected to the oil separator 403 and the second return oil solenoid valve 204 via a pipeline.

[0036] Gas-liquid separator 308 is connected to four-way directional valve 402 via pipeline. Gas-liquid separator 308 is also connected to first return oil solenoid valve 106 via pipeline. Four-way directional valve 402 is connected to finned heat exchanger 307 via pipeline. Return oil pipeline 305 is connected to finned heat exchanger 307. Fourth check valve 309 and third check valve 208 are connected to finned heat exchanger 307 via pipeline. Fourth check valve 309 is connected to first check valve 205 via pipeline. Valve 309 is connected to reservoir 206 via a pipeline. Reservoir 206 is connected to filter 303 via a pipeline. Filter 303 is connected to throttling device 302 via a pipeline. Third check valve 208 is connected to second check valve 207 via a pipeline. Throttling device 302 is connected to the pipeline between third check valve 208 and second check valve 207 via a pipeline. Second check valve 207 is connected to the pipeline between first check valve 205 and flooded heat exchanger 108 via a pipeline.

[0037] In an optional embodiment, the flooded heat exchanger 108 is provided with a first oil return port 109 and a second oil return port 201, which are connected to the Venturi device 203 via pipelines.

[0038] In an optional embodiment, a fan 306 is mounted on the finned heat exchanger 307, and multiple fans 306 are provided.

[0039] In an optional embodiment, a ball valve 304 is installed on the pipeline between the reservoir 206 and the filter 303.

[0040] In an optional embodiment, a pressure balancing pipeline 401 is connected to the pipeline between the fourth check valve 309 and the first check valve 205, and the other end of the pressure balancing pipeline 401 is connected to the pipeline between the oil separator 403 and the second return solenoid valve 204.

[0041] In an optional embodiment, a fin temperature sensor 301 is mounted on the fins of the finned heat exchanger 307.

[0042] In an optional embodiment, an ambient temperature sensor 209 is mounted on the finned heat exchanger 307.

[0043] In an optional embodiment, a high-pressure sensor 404 and an exhaust temperature sensor 405 are installed on the pipeline between the oil separator 403 and the first compressor 101 and the second compressor 103.

[0044] In an optional embodiment, the flooded heat exchanger 108 is provided with a flooded heat exchanger inlet 202, and the flooded heat exchanger inlet 202 is connected to the first one-way valve 205 through a pipeline.

[0045] It should be noted that the pipes on the four-way directional valve 402 are divided into pipe C, pipe D, pipe E and pipe S; the return oil line 305 is divided into the first return oil line and the second return oil line; the interfaces on the venturi device 203 are marked as interface A, interface B and interface C respectively.

[0046] In this invention, under heating conditions, the main pipeline circulation is as follows: the outlets of the first compressor 101 and the second compressor 104 are connected to the inlet of the oil separator 403. The outlet of the oil separator 403 is connected to the four-way reversing valve 402D pipe. Under heating conditions, pipe D is connected to pipe E. The four-way reversing valve 402E pipe is connected to the inlet of the flooded heat exchanger 108. The outlet of the flooded heat exchanger 108 is sequentially connected to the first check valve 205, the liquid receiver, the ball valve 304, the filter 303, the throttling device 302, and the third check valve 208. The third check valve 208 is connected to the inlet of the finned heat exchanger 307. The outlet of the finned heat exchanger 307 is connected to the four-way reversing valve 402C pipe. Under heating conditions, pipe C is connected to pipe S. Pipe 402S is connected to the inlet of gas-liquid separator 308, and the outlet of gas-liquid separator 308 is connected to the inlet of first compressor 101 and second compressor 104, thus completing the entire cycle. The oil return pipeline cycle is as follows: the first oil return pipeline connects the oil outlet of oil separator 403 to the oil return solenoid valve, and the oil return solenoid valve is connected to the oil inlet of first compressor 101 and second compressor 104, or connected to the horizontal pipeline of the suction port of first compressor 101 and second compressor 104. In refrigeration mode, the main pipeline cycle is as follows: the outlet of scroll compressor 101 and second compressor 104 is connected to the inlet of oil separator 403, and the outlet of oil separator 403 is connected to the four-way reversing valve 402D. In heating mode, pipe D is connected to pipe C. The four-way reversing valve 402C is connected to the air inlet of the finned heat exchanger 307. The liquid outlet of the finned heat exchanger 307 is sequentially connected to the fourth one-way valve 309, the liquid receiver 206, the ball valve 304, the filter 303, the throttling device 302, and the second one-way valve 207. The second one-way valve 207 is connected to the liquid inlet of the flooded heat exchanger 108. The air outlet of the flooded heat exchanger 108 is connected to the four-way reversing valve 402E. In refrigeration mode, E is connected to S. The four-way reversing valve 402S is connected to the inlet of the gas-liquid separator 308. The outlet of the gas-liquid separator 308 is connected to the inlet of the first compressor 101 and the second compressor 104. This completes the entire cycle. The oil return pipeline cycle is as follows: The first oil return pipeline is the oil separator 409. 3. The oil outlet is connected to the first return oil solenoid valve 106. The first return oil solenoid valve 106 is connected to the oil inlet of the first compressor 101 and the second compressor 104, or to the horizontal pipeline of the suction port of the first compressor 101 and the second compressor 104. The second return oil pipeline is the high-pressure gas on the outlet pipeline of the oil separator 403. It is connected in sequence to the second return oil solenoid valve 204 and the Venturi device 203 interface A. The Venturi device 203 interface B is connected to the oil inlet of the first compressor 101 and the second compressor 104, or to the horizontal pipeline of the suction port of the first compressor 101 and the second compressor 104. The first return oil port 109 and the second return oil port 201 of the flooded heat exchanger 108 are connected to the Venturi device 203 interface C.A controller can be used, with its output terminals connected to the control points of each of the above-mentioned devices, and its input terminals connected to various sensors at each monitoring point. After adopting adaptive control logic, the controller can rationally control the liquid supply based on operating conditions, maximizing the capacity of the first compressor 101, the second compressor 104, and the heat exchanger. This ensures better matching between the various components of the unit, reliable and stable oil return, effectively extending the unit's service life and improving its energy efficiency.

[0047] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A liquid-flooded air source heat pump system, comprising a first compressor (101), a second oil return solenoid valve (204), a high and low pressure gauge (107), a gas-liquid separator (308) and a second compressor (103), characterized in that: The first compressor (101) is connected to the second compressor (103) via an oil balance pipe (102); The first compressor (101) is connected to an oil separator (403) via a pipeline, and the oil separator (403) is connected to a pipeline connecting the first compressor (101) and the second compressor (103) via a pipeline; The first compressor (101) and the oil separator (403) are connected via a pipeline, and an intake temperature sensor (104), a low pressure sensor (105) and a first oil return solenoid valve (106) are respectively fixedly installed on the pipeline between the first compressor (101) and the oil separator (403); The oil separator (403) is connected to a four-way reversing valve (402) via a pipeline, the second oil return solenoid valve (204) is connected to a venturi device (203) via a pipeline, the venturi device (203) is connected to the first compressor (101), the second oil return solenoid valve (204) and the pipeline between the suction main pipe of the second compressor (103) via pipelines, respectively, the high and low pressure gauges (107) are installed on the pipeline between the oil separator (403) and the second oil return solenoid valve (204) via pipelines, and are connected to the pipelines installed between the gas-liquid separator (308) and the suction main pipes of the first compressor (101) and the second compressor (103); The venturi device (203) is connected to a flooded heat exchanger (108) via a pipeline, the flooded heat exchanger (108) is connected to a four-way reversing valve (402) via pipelines, and is connected to a first check valve (205), the four-way reversing valve (402) is connected to a gas-liquid separator (308) via a pipeline, and the gas-liquid separator (308) is connected to a pipeline between an oil separator (403) and a second oil return solenoid valve (204) via a pipeline; The gas-liquid separator (308) is connected to the four-way reversing valve (402) through a pipeline, the gas-liquid separator (308) is connected to the first oil return solenoid valve (106) through a pipeline, the four-way reversing valve (402) is connected to the fin heat exchanger (307) through a pipeline, the fin heat exchanger (307) is connected to the oil return pipeline (305), the fin heat exchanger (307) is respectively connected to the fourth check valve (309) and the third check valve (208) through pipelines, the fourth check valve (309) is connected to the first check valve (205) through a pipeline, the fourth check valve (309) is connected to the liquid reservoir (206) through a pipeline, the liquid reservoir (206) is connected to the filter (303) through a pipeline, and the filter (303) is connected to the throttling device ( The throttling device (302) is connected to a pipeline between the third one-way valve (208) and the second one-way valve (207), and the throttling device (302) is connected to a pipeline between the third one-way valve (208) and the second one-way valve (207) through a pipeline. The second one-way valve (207) is connected to a pipeline between the first one-way valve (205) and the full-liquid heat exchanger (108) through a pipeline. The full-liquid heat exchanger (108) is provided with a first oil return port (109) and a second oil return port (201), and the first oil return port (109) and the second oil return port (201) are connected to a venturi device (203) through a pipeline. The full-liquid heat exchanger (108) is provided with a full-liquid heat exchanger inlet (202), and the full-liquid heat exchanger inlet (202) is connected to the first one-way valve (205) through a pipeline.

2. A liquid-filled air source heat pump system according to claim 1, characterized in that: A fan (306) is installed on the fin heat exchanger (307), and a plurality of fans (306) are provided.

3. A liquid-filled air source heat pump system according to claim 1, characterized in that: A ball valve (304) is installed on the pipeline between the liquid reservoir (206) and the filter (303).

4. A liquid-filled air source heat pump system according to claim 1, characterized in that: A pressure balancing pipeline (401) is connected to the pipeline between the fourth one-way valve (309) and the first one-way valve (205), and the other end of the pressure balancing pipeline (401) is connected to the pipeline between the oil separator (403) and the second oil return solenoid valve (204).

5. The flooded air source heat pump system according to claim 1, characterized in that: A fin temperature sensor (301) is installed on the fin of the fin heat exchanger (307).

6. The flooded air source heat pump system according to claim 1, characterized in that: An ambient temperature sensor (209) is installed on the fin heat exchanger (307).

7. The flooded air source heat pump system according to claim 1, characterized in that: A high-pressure pressure sensor (404) and an exhaust gas temperature sensor (405) are installed on the pipeline between the oil separator 403 (403) and the first compressor (101) and the second compressor (103).

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