Refrigeration apparatus having refrigerant charge recovery function

Abstract

The application relates to a refrigeration equipment with a refrigerant charging and recycling function in the field of refrigeration equipment, which comprises a refrigeration equipment main body and a compressor, a gas conveying pipe is connected between the refrigeration equipment main body and the compressor, a recovery tank is arranged outside the compressor, a front treatment unit is arranged between the compressor and the recovery tank, and a recovery pipe is connected between the recovery tank and the refrigeration equipment main body; the front treatment unit comprises a protection box, a mixed treatment section and a multi-purpose detection section are connected in the protection box, the mixed treatment section and the multi-purpose detection section are communicated with the gas conveying pipe and a guide pipe respectively, and a filtering structure is connected in the mixed treatment section; a gas-liquid separation device connected with the mixed treatment section is connected to the input end of the recovery tank; a rear treatment unit is arranged between the recovery tank and the compressor; the accurate and efficient charging and recycling of the refrigerant are realized, the gas and liquid refrigerants are respectively treated and then output through the front treatment, gas-liquid separation and rear treatment processes, and the quality of the recycled refrigerant is ensured.

Description

Technical Field

[0001] The present invention relates to a refrigeration device with a refrigerant charging and recovery function, and in particular to a refrigeration device with a refrigerant charging and recovery function applied in the field of refrigeration devices. Background Art

[0002] The background technology of the refrigerant charging and recovery function of existing refrigeration equipment stems from the demand for environmental protection and improvement of refrigeration system efficiency. Refrigerant is an indispensable medium in the refrigeration system, responsible for circulating in the system, absorbing heat and releasing it to the external environment. However, many traditional refrigerants such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) have a destructive effect on the ozone layer, while other alternative refrigerants such as hydrofluorocarbons (HFCs) are harmless to the ozone layer but have a high global warming potential. Therefore, the charging and recovery of refrigerants have become crucial. The refrigerant charging and recovery function allows refrigeration equipment to charge and recover refrigerants efficiently and safely during installation, maintenance or repair, reducing refrigerant leakage and emissions and reducing the impact on the environment. In addition, this function also helps to improve the energy efficiency ratio of the refrigeration system, extend the service life of the equipment, and ensure that the refrigeration equipment operates in the best condition.

[0003] The specification of Chinese invention patent CN113465241B discloses a method for automatically charging refrigerant, an automatic charging device and a refrigeration device, which realizes that the automatic charging device automatically recovers and charges refrigerant to the refrigeration device, so that the refrigeration device can recover the refrigerant to the refrigerant storage device or take the refrigerant out of the refrigerant storage device according to different working conditions, thereby enabling the refrigeration device to adjust its internal total amount of refrigerant according to different working conditions, improving the operating energy efficiency of the refrigeration device and ensuring the reliability of the refrigeration equipment.

[0004] The specification of Chinese invention patent CN113465241B discloses a refrigerant filling and discharging device for refrigeration equipment, which relates to the field of refrigerant filling technology. The invention can realize the function of refrigerant recovery and filling of the refrigerator by setting a feed barrel and a recovery filter barrel, and has the effect of filling refrigerant and recovering refrigerant. The recovered refrigerant is sent to the inside of the recovery filter barrel, and after filtering and purification, the usable refrigerant is re-delivered to the feed barrel to recycle the refrigerant, saving resources.

[0005] In the prior art, refrigerant impurities are not thoroughly treated during refrigerant charging and recovery, and it is difficult to effectively remove oil stains and large particle impurities, resulting in insufficient refrigerant purity, especially insufficient treatment of gaseous refrigerants. The mixed treatment of gaseous and liquid refrigerants in the prior art may cause cross-contamination, affecting the refrigerant purity. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that in the prior art, the refrigerant impurities are not thoroughly treated during the charging and recovery of the refrigerant, and it is not easy to effectively remove oil stains and large particle impurities, resulting in insufficient refrigerant purity, especially insufficient treatment of gaseous refrigerants. The mixed treatment of gaseous and liquid refrigerants in the prior art may cause cross-contamination, affecting the refrigerant purity.

[0007] To solve the above problems, the present invention provides a refrigeration device with a refrigerant charging and recovery function, comprising a refrigeration device body and a compressor, an air delivery pipe being connected between the refrigeration device body and the compressor, a recovery tank being provided on the outside of the compressor, a pre-processing unit being provided between the compressor and the recovery tank, and a recovery pipe being connected between the recovery tank and the refrigeration device body;

[0008] The pre-processing unit includes a protection box, in which a mixing processing section and a multi-purpose detection section are connected. The mixing processing section and the multi-purpose detection section are communicated with the gas pipeline and the conduit respectively. The mixing processing section is connected with a filtering structure.

[0009] The multi-purpose detection section is connected with a main output tube and an auxiliary output tube;

[0010] The main output pipe and the auxiliary output pipe are connected to a liquid sensor and a gas sensor respectively. The output end of the auxiliary output pipe is connected to the output end of the main output pipe. An electromagnetic three-way valve is connected between the main output pipe and the input end of the mixing processing section.

[0011] The input end of the recovery tank is connected to a gas-liquid separation device connected to the mixing treatment section; a post-processing unit is provided between the recovery tank and the compressor, the post-processing unit is connected to a gas storage tank, and a liquid drying tube and a gas adsorption tube are provided in the post-processing unit; the output ends of the liquid drying tube and the gas adsorption tube are both connected to the input end of the compressor.

[0012] In the above-mentioned refrigeration equipment with refrigerant charging and recovery function, impurities in the recovered refrigerant are reduced through multi-stage processing and separation, thereby ensuring the quality of the recovered and recharged refrigerant.

[0013] As a further improvement of the present application, the filtering structure includes a metal wire mesh filter and a polyester fiber adsorption layer.

[0014] As a further improvement of the present application, a molecular sieve is connected to the liquid drying tube; an adsorption tube is connected to the gas adsorption tube, and the adsorption tube is filled with an alkaline adsorbent.

[0015] As a further improvement of the present application, a liquid condensation chamber and a gas condensation chamber are provided in the compressor, the output ends of the liquid condensation chamber and the gas condensation chamber are connected to the main output pipe and the auxiliary output pipe respectively, and the input ends of the liquid condensation chamber and the gas condensation chamber are connected to the liquid drying pipe and the gas adsorption pipe respectively.

[0016] As another improvement of the present application, the gas-liquid separation device includes a cyclone separator, the cyclone separator includes a main shell, an air outlet pipe connected to the air storage tank is fixedly connected to the middle of the main shell, an oil-liquid separation net connected to the main shell is provided on the outside of the air outlet pipe, an automatic drain valve is connected between the bottom end of the main shell and the recovery tank, an oil collecting tank located inside the oil-liquid separation net is provided on the inner wall of the main shell, an oil drain hole is provided on the oil collecting tank, an annular liquid guide groove located outside the oil-liquid separation net is provided on the inner wall of the main shell, and the annular liquid guide groove is communicated with the input end of the automatic drain valve.

[0017] As another improved supplement of the present application, the gas storage tank includes a liquid separator, which is connected to a gas release valve and a pressure sensor.

[0018] As another improved supplement of the present application, an auxiliary filling system is also included, the auxiliary filling system includes a terminal processor, and the terminal processor is connected to a control module, a monitoring module, a detection module and a data processing module;

[0019] The monitoring module is used to collect monitoring data at the multi-purpose detection section, and monitor the refrigerant status data at the pre-processing unit, recovery tank and post-processing unit in real time to ensure data accuracy during the charging process.

[0020] The detection module is used to collect detection data of the liquid sensor, including the refrigerant composition in the main output pipe and the auxiliary output pipe. A person skilled in the art may select a liquid sensor that can detect the refrigerant composition in the prior art, such as a non-dispersive infrared sensor and an electrochemical sensor.

[0021] The data processing module is used to process and analyze monitoring data and test data to ensure that the refrigerant is fully processed by the pre-processing unit, recovery tank or post-processing unit;

[0022] The control module is used to adjust the working parameters of the auxiliary filling system according to the preset plan based on the analysis results of the data processing module.

[0023] As another improvement of the present application, the working process of the multi-purpose detection section includes: the main output pipe detects the liquid refrigerant when it is output; the auxiliary output pipe detects the refrigerant converted from gas to liquid when it is output. When the detection data at any position is unqualified, the control module controls the three-way solenoid valve to operate, so that the main output pipe or the auxiliary output pipe transfers the refrigerant inside it to the mixing processing section.

[0024] In summary, this solution achieves accurate and efficient charging and recovery of refrigerants. Through pre-processing, gas-liquid separation and post-processing processes, the recovered gas and liquid refrigerants are processed separately and then output, ensuring the quality of the recovered refrigerant and achieving effective utilization of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front perspective view of the first embodiment of the present application;

[0026] Figure 2 A path diagram for refrigerant recovery and recharging according to the first embodiment of the present application;

[0027] Figure 3 This is a top cross-sectional view of the multi-purpose detection section of the first embodiment of the present application;

[0028] Figure 4 This is a cross-sectional view of the multi-purpose detection section of the first embodiment of the present application;

[0029] Figure 5 This is a side perspective view of the first embodiment of the present application;

[0030] Figure 6 This is a cross-sectional view of the recovery tank according to the first embodiment of the present application;

[0031] Figure 7 This is a system block diagram of the second implementation method of this application.

[0032] Description of the numbers in the figure:

[0033] 1 Refrigeration equipment main body, 2 compressor, 3 pre-processing unit, 31 protection box, 32 mixing processing section, 33 multi-purpose detection section, 331 main output pipe, 332 auxiliary output pipe, 4 recovery tank, 41 main shell, 42 air outlet pipe, 43 oil-liquid separation network, 5 post-processing unit, 51 gas storage tank, 52 liquid drying pipe, 53 gas adsorption tube. DETAILED DESCRIPTION

[0034] The following describes two implementation methods of the present application in detail with reference to the accompanying drawings.

[0035] The first implementation method:

[0036] Figures 1-6 Figure 1 shows a refrigeration device with a refrigerant charging and recovery function, comprising a refrigeration device body 1 and a compressor 2. An air supply pipe is connected between the refrigeration device body 1 and the compressor 2. A recovery tank 4 is connected to the outside of the compressor 2 via a conduit. A pre-processing unit 3 is provided between the compressor 2 and the recovery tank 4. A recovery pipe is connected between the recovery tank 4 and the refrigeration device body 1. Both the air supply pipe and the recovery pipe are made of 316 stainless steel and have an inner diameter of 20 mm.

[0037] The pre-processing unit 3 includes a protective box 31, which is connected to a mixing processing section 32 and a multi-purpose detection section 33. The mixing processing section 32 and the multi-purpose detection section 33 are respectively connected to the gas pipe and the catheter. The mixing processing section 32 is connected to a filtering structure; the filtering structure includes a metal mesh filter and a polyester fiber adsorption layer.

[0038] The multi-purpose detection section 33 is connected to a main output tube 331 and a secondary output tube 332; liquid sensors are installed in both the main output tube 331 and the secondary output tube 332. The output end of the secondary output tube 332 is connected to the output end of the main output tube 331. An electromagnetic three-way valve is connected between the main output tube 331 and the input end of the mixing processing section 32.

[0039] The main output pipe 331 is used for detecting the output of liquid refrigerant;

[0040] The auxiliary output pipe 332 is used for detecting the output of the refrigerant converted from gas to liquid;

[0041] A post-processing unit 5 is provided between the recovery tank 4 and the compressor 2. The post-processing unit 5 is connected to a gas storage tank 51, which is provided with a liquid drying pipe 52 and a gas adsorption pipe 53. The gas storage tank 51 is used to store gaseous refrigerant. The gas storage tank 51 includes a liquid separator, which is connected to a bleed valve and a pressure sensor. The pressure sensor monitors the pressure difference in the tank and automatically opens the bleed valve to exhaust gas when non-condensable gas accumulation is detected.

[0042] The liquid drying pipe 52 is used to dry the liquid refrigerant output from the recovery tank 4. A molecular sieve having a cubic lattice structure of aluminosilicate is connected to the liquid drying pipe 52.

[0043] The gas adsorption tube 53 is used for adsorption treatment of the gaseous refrigerant output from the liquid drying tube 52. The gas adsorption tube 53 is connected to an adsorption tube filled with an alkaline adsorbent.

[0044] A liquid condensation chamber and a gas condensation chamber are provided in the compressor 2. The output ends of the liquid condensation chamber and the gas condensation chamber are connected to the main output pipe 331 and the auxiliary output pipe 332 respectively, and the input ends of the liquid condensation chamber and the gas condensation chamber are connected to the liquid drying pipe 52 and the gas adsorption pipe 53 respectively.

[0045] The gas-liquid separation device includes a cyclone separator, which includes a main housing 41. An outlet pipe 42 that communicates with the gas storage tank 51 is fixedly connected to the middle of the main housing 41. An oil-liquid separation network 43 connected to the main housing 41 is provided on the outside of the outlet pipe 42. A conduit between the main housing 41 and the mixing processing section 32 inputs the mixed refrigerant into the inside of the oil-liquid separation network 43.

[0046] An automatic drain valve is connected between the bottom end of the main housing 41 and the recovery tank 4. An oil collecting groove is provided on the inner wall of the main housing 41 and is located inside the oil-liquid separation net 43. The oil collecting groove is provided with an oil drain hole. An annular liquid guide groove is provided on the inner wall of the main housing 41 and is located outside the oil-liquid separation net 43. The annular liquid guide groove is communicated with the input end of the automatic drain valve.

[0047] When the cyclone separator is working, the oil droplets are thrown to the oil-liquid separation net 43 due to centrifugal action and are intercepted, then flow into the oil collecting tank and finally discharged through the oil drain hole, while the liquid refrigerant passes through the oil-liquid separation net 43 and falls into the annular liquid guide groove, and finally discharged into the recovery tank 4 through the automatic drain valve; thus achieving the separation of oil, liquid and gas.

[0048] In this solution, when the refrigerant is recovered, the mixed refrigerant is initially filtered through the mixing treatment section 32 to remove large particles of impurities and oil in the mixture, and then the gaseous refrigerant and liquid refrigerant are separated by the gas-liquid separation device. The separated liquid refrigerant is stored in the recovery tank 4. When it is output, it is dried through the liquid drying pipe 52 and finally charged into the refrigeration equipment through the compressor.

[0049] The gaseous refrigerant is stored in the gas storage tank 51. When it is output, it is first adsorbed by the gas adsorption tube 53, and then compressed, condensed and liquefied by the compressor to be charged into the refrigeration equipment.

[0050] In summary, this solution achieves efficient charging and recovery of refrigerant, effectively improves the energy efficiency ratio of refrigeration equipment, and significantly reduces the negative impact on the environment; the refrigerant is pre-treated by the pre-processing unit to ensure the quality of the recovered refrigerant. At the same time, the setting of the gas-liquid separation device and the post-processing unit further improves the fineness and safety of refrigerant treatment.

[0051] Second implementation method:

[0052] Figure 7 As shown, it also includes an auxiliary filling system, which includes a terminal processor, and the terminal processor is connected to a control module, a monitoring module, a detection module and a data processing module;

[0053] The monitoring module is used to collect monitoring data at the multi-purpose detection section 33, and monitor the refrigerant status data at the pre-processing unit 3, the recovery tank 4 and the post-processing unit 5 in real time, including data such as temperature, pressure and flow rate; to ensure the accuracy of data during the charging process.

[0054] The detection module is used to collect detection data of the liquid sensor, including the refrigerant composition in the main output pipe 331 and the auxiliary output pipe 332. A person skilled in the art may select a liquid sensor that can detect the refrigerant composition in the prior art, such as a non-dispersive infrared sensor and an electrochemical sensor.

[0055] The data processing module is used to process and analyze monitoring data and test data to ensure that the refrigerant is fully processed by the pre-processing unit 3, the recovery tank 4 or the post-processing unit 5;

[0056] The control module is used to adjust the working parameters of the auxiliary filling system, such as filling speed and filling volume, according to the analysis results of the data processing module and the preset plan to achieve intelligent filling control.

[0057] In summary, this embodiment achieves comprehensive monitoring and control of the refrigerant charging process by adding an auxiliary charging system, further improving the charging efficiency and safety of the refrigeration equipment.

[0058] The working process of the multi-purpose detection section 33 includes: the main output pipe 331 detects the refrigerant during its output in liquid form; the auxiliary output pipe 332 detects the refrigerant converted from gas to liquid during its output. When the detection data at any position fails (a suitable qualified threshold is set by a person skilled in the art, for example: oil content ≤ 5%, particle size ≤ 10 μm, water content > 50 ppm), the control module controls the three-way solenoid valve to operate, so that the main output pipe 331 or the auxiliary output pipe 332 transfers the refrigerant therein to the mixing treatment section 32, and finally returns it to the recovery tank 4.

[0059] Optionally, during an idle period (appropriate conditions are set as idle periods by those skilled in the art, for example, the system enters idle mode when it detects that the ambient temperature is lower than 10°C and the pressure is lower than 0.5 MPa), the gaseous refrigerant in the gas storage tank 51 is output, converted into liquid refrigerant by the compressor 2, and then output to the mixing processing section 32 through the multi-purpose detection section 33, and finally stored in the recovery tank 4 waiting for centralized output.

[0060] This embodiment achieves comprehensive monitoring and control of the refrigerant charging process through the addition of an auxiliary charging system, further improving the charging efficiency and safety of the refrigeration equipment; the setting of the monitoring module, detection module, data processing module and control module ensures the accuracy of data during the charging process, and adjusts the working parameters according to the analysis results to achieve intelligent charging control.

[0061] In summary, this solution achieves accurate and efficient charging and recovery of refrigerants. Through pre-processing, gas-liquid separation and post-processing processes, the recovered gas and liquid refrigerants are processed separately and then output, ensuring the quality of the recovered refrigerant and achieving effective utilization of resources.

[0062] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A refrigeration device with a refrigerant charging and recovery function, comprising a refrigeration device body (1) and a compressor (2), wherein an air delivery pipe is connected between the refrigeration device body (1) and the compressor (2), and characterized in that: A recovery tank (4) is provided on the outside of the compressor (2), a pre-processing unit (3) is provided between the compressor (2) and the recovery tank (4), and a recovery pipe is connected between the recovery tank (4) and the refrigeration equipment body (1); The pre-processing unit (3) comprises a protection box (31), a mixing processing section (32) and a multi-purpose detection section (33) are connected to the protection box (31), the mixing processing section (32) and the multi-purpose detection section (33) are respectively connected to the gas transmission pipe and the catheter, and a filtering structure is connected to the mixing processing section (32); The multi-purpose detection section (33) is connected to a main output tube (331) and a secondary output tube (332); liquid sensors are installed in both the main output tube (331) and the secondary output tube (332); the output end of the secondary output tube (332) is connected to the output end of the main output tube (331); and an electromagnetic three-way valve is connected between the main output tube (331) and the input end of the mixing processing section (32); The input end of the recovery tank (4) is connected to a gas-liquid separation device connected to a mixing treatment section (32); a post-processing unit (5) is provided between the recovery tank (4) and the compressor (2); the post-processing unit (5) is connected to a gas storage tank (51); a liquid drying pipe (52) and a gas adsorption pipe (53) are provided in the post-processing unit (5); the output ends of the liquid drying pipe (52) and the gas adsorption pipe (53) are both connected to the input end of the compressor (2).

2. The refrigeration equipment with refrigerant charging and recovery function according to claim 1, characterized in that: The filtering structure includes a metal wire mesh filter and a polyester fiber adsorption layer.

3. The refrigeration equipment with refrigerant charging and recovery function according to claim 1, characterized in that: The liquid drying tube (52) is connected to a molecular sieve; the gas adsorption tube (53) is connected to an adsorption tube, and the adsorption tube is filled with an alkaline adsorbent.

4. The refrigeration equipment with refrigerant charging and recovery function according to claim 1, characterized in that: A liquid condensation chamber and a gas condensation chamber are provided in the compressor (2); the output ends of the liquid condensation chamber and the gas condensation chamber are respectively connected to the main output pipe (331) and the auxiliary output pipe (332); and the input ends of the liquid condensation chamber and the gas condensation chamber are respectively connected to the liquid drying pipe (52) and the gas adsorption pipe (53).

5. The refrigeration equipment with refrigerant charging and recovery function according to claim 1, characterized in that: The gas-liquid separation device comprises a cyclone separator, which comprises a main shell (41). An air outlet pipe (42) communicating with an air storage tank (51) is fixedly connected to the middle of the main shell (41). An oil-liquid separation net (43) connected to the main shell (41) is provided on the outside of the air outlet pipe (42). An automatic drain valve is connected between the bottom end of the main shell (41) and the recovery tank (4). An oil collecting groove located inside the oil-liquid separation net (43) is provided on the inner wall of the main shell (41). An oil drain hole is provided on the oil collecting groove. An annular liquid guide groove located outside the oil-liquid separation net (43) is provided on the inner wall of the main shell (41). The annular liquid guide groove is communicated with the input end of the automatic drain valve.

6. The refrigeration equipment with refrigerant charging and recovery function according to claim 1, characterized in that: The gas storage tank (51) comprises a liquid separator, and the liquid separator is connected to a gas release valve and a pressure sensor.

7. A refrigeration device with a refrigerant charging and recovery function according to any one of claims 1 to 6, characterized in that: It also includes an auxiliary filling system, which includes a terminal processor, and the terminal processor is connected to a control module, a monitoring module, a detection module and a data processing module; The monitoring module is used to collect monitoring data at the multi-purpose detection section (33) and monitor the refrigerant status data at the pre-processing unit (3), the recovery tank (4) and the post-processing unit (5) in real time; Ensure data accuracy during the filling process; The detection module is used to collect detection data of the liquid sensor, and the detection data includes the refrigerant composition in the main output pipe (331) and the auxiliary output pipe (332); The data processing module is used to process and analyze monitoring data and detection data to ensure that the refrigerant is fully processed by the pre-processing unit (3), the recovery tank (4) or the post-processing unit (5); The control module is used to adjust the working parameters of the auxiliary filling system according to the analysis results of the data processing module according to a preset plan.

8. The refrigeration equipment with refrigerant charging and recovery function according to claim 7, characterized in that: The working process of the multi-purpose detection section (33) includes: the main output pipe (331) detects the liquid refrigerant when it is output; the auxiliary output pipe (332) detects the refrigerant converted from gas to liquid when it is output. When the detection data at any position is unqualified, the control module controls the three-way solenoid valve to operate, so that the main output pipe (331) or the auxiliary output pipe (332) transfers the refrigerant therein to the mixing processing section (32).

Images