Refrigerant charging and discharging device for refrigeration equipment

Abstract

The refrigerant charging and discharging device for the refrigeration equipment comprises a discharging mechanism, a charging mechanism and a quasi-discharging detection mechanism, the quasi-discharging detection mechanism comprises a transfer box, the end, away from a vacuum pump, of a discharging pipeline communicates with the transfer box, and a detection air storage cylinder is arranged above the transfer box; a detection outlet pipe is communicated between the detection air storage cylinder and the transfer box, a detection piston plate in sliding sealing connection with the detection air storage cylinder is arranged in the detection air storage cylinder, an elastic lifting rope is fixedly connected between the detection piston plate and the inner wall of the top end of the detection air storage cylinder, and one end, away from the discharge pipeline, of the transfer box is communicated with a continuous discharge pipe; according to the refrigerant charging and discharging device, before the refrigerant is discharged officially, discharging simulation detection can be carried out firstly, so that the normal sealing performance of the discharging mechanism is ensured, the refrigerant leakage phenomenon in the refrigerant discharging process can be effectively avoided, and the safety and reliability of the device are greatly improved.

Description

Technical Field

[0001] The present invention relates to a refrigerant filling and discharging device, in particular to a refrigerant filling and discharging device for refrigeration equipment applied in the technical field of refrigeration equipment. Background Art

[0002] Refrigeration equipment is a device that maintains a low temperature environment through heat transfer technology and is widely used in household, commercial, industrial and medical fields. Refrigerant is the key working medium for refrigeration equipment to achieve the refrigeration function. In the maintenance and repair process of refrigeration equipment, the filling and discharge of refrigerant is a common and critical operation.

[0003] The invention patent with publication number CN118912760B discloses a refrigerant filling and discharging device for refrigeration equipment. 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 functions of filling refrigerant and recovering refrigerant. The recovered refrigerant is sent to the inside of the recovery filter barrel, and the usable refrigerant is re-delivered to the feed barrel after filtering and purification, so as to recycle the refrigerant and save resources.

[0004] The invention patent with publication number CN115200272B discloses a mobile refrigerant recovery and filling device, which solves the technical problem that there is no way to adjust the refrigerant recovery and filling speed.

[0005] When discharging refrigerant, existing refrigerant charging and discharging devices often ignore the importance of the sealing of the discharge mechanism itself to operational safety and environmental impact. If there is a sealing problem with the discharge mechanism, it is very easy to cause refrigerant leakage during the refrigerant discharge process. Refrigerant leakage will not only cause waste of resources and increase maintenance costs, but also cause serious pollution to the environment. Some refrigerants may also pose a threat to human health. In addition, once a leakage occurs, it may also cause safety accidents. For example, leakage of flammable refrigerants may cause an explosion when exposed to open flames. Therefore, it is of great practical significance to develop a charging and discharging device that can effectively detect the sealing of the discharge mechanism before discharging the refrigerant. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is: how to detect the sealing performance of the discharge mechanism before discharging the refrigerant, so as to effectively avoid the refrigerant leakage during the process of discharging the refrigerant.

[0007] In order to solve the above problems, the present invention provides a refrigerant filling and discharging device for refrigeration equipment, including a discharging mechanism, a charging mechanism and a proposed discharge detection mechanism, the discharging mechanism includes a recovery tank and a vacuum pump, a tank connecting pipe is connected between the exhaust end of the vacuum pump and the recovery tank, a discharge solenoid valve is arranged on the tank connecting pipe, an air inlet end of the vacuum pump is connected with a discharge pipeline, the proposed discharge detection mechanism includes a transfer box, an end of the discharge pipeline away from the vacuum pump is connected to the transfer box, a detection air storage cylinder is arranged above the transfer box, and the detection air storage cylinder and the transfer box are connected. A detection outlet pipe is provided, and a detection piston plate which is slidingly and sealingly connected to the detection air storage cylinder is arranged in the detection air storage cylinder, an elastic hanging rope is fixedly connected between the detection piston plate and the top inner wall of the detection air storage cylinder, an end of the transfer box away from the discharge pipe is connected with a row of pipes, an electric push rod for adjusting and sealing is fixedly installed in the transfer box, and a sealing plate is fixedly connected to the output end of the electric push rod for adjusting and sealing, the sealing plate and the row of pipes are slidingly and sealingly connected, an air pressure sensor is fixedly installed in the recovery tank, a reflux pipe is connected between the detection outlet pipe and the recovery tank, and a reflux solenoid valve is arranged on the reflux pipe.

[0008] In the above-mentioned refrigerant charging and discharging device for refrigeration equipment, before the refrigerant is officially discharged, a simulated discharge test will be carried out first to ensure that the sealing of the discharge mechanism is normal, thereby effectively avoiding refrigerant leakage during the refrigerant discharge process.

[0009] As a further improvement of the present application, the proposed inspection mechanism also includes a proposed inspection intelligent control system, which includes a proposed inspection setting module, a proposed inspection control module, a proposed inspection analysis module, and a ring feedback module. The proposed inspection setting module is signal-connected to the proposed inspection analysis module, the proposed inspection control module is signal-connected to the vacuum pump, the discharge solenoid valve, the air pressure sensor, and the reflux solenoid valve, the air pressure sensor is signal-connected to the proposed inspection analysis module, and the proposed inspection analysis module is signal-connected to the ring feedback module.

[0010] As a further improvement of the present application, a distance sensor is fixedly mounted on the inner wall of the top end of the detection gas storage cylinder, and the distance sensor is connected to the signal of the control module to be detected.

[0011] As a further improvement of the present application, a pressure-regulating electric push rod is fixedly installed on the inner wall of the top end of the recovery tank, and the output end of the pressure-regulating electric push rod is fixedly connected to a pressure-regulating piston plate that is slidingly sealed with the recovery tank, and the tank connecting pipe, the outlet pipe, and the reflux pipe are all located below the pressure-regulating piston plate. The intelligent control system to be inspected also includes a discharge control module, and the discharge control module is signal-connected to the vacuum pump, the discharge solenoid valve, the sealing electric push rod, and the pressure-regulating electric push rod, and the air pressure sensor is also signal-connected to the discharge control module.

[0012] As a further improvement of the present application, the sealing plate is arranged in an L shape, and the sealing plate consists of a horizontal section and a vertical section. The vertical section is slidingly and sealingly connected to the row of pipes, the horizontal section matches the detection pipe, and the horizontal section and the sealing electric push rod are both located directly below the detection pipe.

[0013] As a further improvement of the present application, a plurality of pressure relief pipes are connected to the side wall of the recovery tank, the pressure relief pipes are located above the pressure regulating piston plate, and one end of the pressure relief pipe away from the recovery tank is sealed and fixedly connected with an elastic sealing membrane matching therewith.

[0014] As a further improvement of the present application, the filling mechanism includes a refrigerant cylinder and a filling pipe connected to the refrigerant cylinder, the filling pipe is provided with a flow meter and a filling solenoid valve, the side wall of the recovery tank is connected to a derivation pipe, the derivation pipe is provided with a derivation valve, and the discharge pipe is provided with a discharge check valve.

[0015] As another improvement of the present application, a matching linkage sealing plate is movably provided below the vertical section, an electromagnet is fixedly installed on the vertical section, a linkage iron block is fixedly installed on the linkage sealing plate, and a resist rod is also fixedly installed on the top inner wall of the detection air storage cylinder.

[0016] As another improvement supplement to the present application, the intelligent control system to be inspected also includes a self-inspection control module, which is signal-connected to the pressure-adjusting electric push rod, the sealing electric push rod, the reflux solenoid valve, and the electromagnet.

[0017] As another improvement supplement to the present application, the bottom end of the support rod is lower than the bottom end of the distance sensor, and guide plates fixedly mounted on the inner wall of the bottom end of the transfer box are provided on both sides of the linkage sealing plate, and the linkage sealing plate is slidably connected to the guide plate.

[0018] To sum up, through the setting of the simulated discharge detection mechanism, the refrigerant filling and discharge device in the present application will first perform a simulated discharge test before officially discharging the refrigerant to ensure that the sealing of the discharge mechanism is normal, thereby effectively avoiding refrigerant leakage in the process of discharging the refrigerant, greatly improving the safety and reliability of the device; through the joint setting of the linkage sealing plate, electromagnet, linkage iron block, etc., before the discharge mechanism is tested, the simulated discharge detection mechanism will first perform a self-inspection to ensure the accuracy and reliability of the detection of the discharge mechanism, further improving the safety and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the discharge mechanism and the intended discharge detection mechanism in the first embodiment of the present application;

[0020] Figure 2 This is a schematic cross-sectional view of the transfer box in the first embodiment of the present application;

[0021] Figure 3 This is a schematic cross-sectional view of the gas storage cylinder detection part in the first embodiment of the present application;

[0022] Figure 4 This is a schematic cross-sectional view of the recovery tank in the first embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of the filling mechanism in the first embodiment of the present application;

[0024] Figure 6 This is a system structure block diagram of the intelligent control system to be inspected in the first embodiment of the present application;

[0025] Figure 7 This is a schematic cross-sectional structural diagram of the transfer box in the second embodiment of the present application;

[0026] Figure 8 For this application Figure 7 A schematic diagram of the enlarged structure at A in the middle;

[0027] Fig. 9 This is a schematic cross-sectional view of the detection of the gas storage cylinder in the second embodiment of the present application;

[0028] Fig.10 This is a system structure block diagram of the intelligent control system to be tested in the second embodiment of the present application.

[0029] Description of the numbers in the figure:

[0030] 101. Recovery tank; 102. Vacuum pump; 103. Tank connecting pipe; 104. Discharge pipe; 105. Discharge solenoid valve; 106. Air pressure sensor; 107. Delivering pipe; 108. Delivering valve; 109. Pressure regulating electric push rod; 110. Pressure regulating piston plate; 111. Pressure relief pipe; 112. Elastic sealing membrane; 113. Discharge check valve; 201. Transfer box; 202. Detection gas cylinder; 203. Detection outlet pipe; 204 , detection piston plate; 205, elastic hanging rope; 206, continuous pipe; 207, sealing electric push rod; 208, sealing pipe plate; 209, reflux pipe; 210, reflux solenoid valve; 211, distance sensor; 212, linkage sealing plate; 213, electromagnet; 214, linkage iron block; 215, push rod; 216, guide plate; 301, refrigerant cylinder; 302, filling pipeline; 303, flow meter; 304, filling solenoid valve. DETAILED DESCRIPTION

[0031] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0032] The first implementation method:

[0033] Figure 1-Figure 6 A refrigerant filling and discharging device for refrigeration equipment is shown, including a discharging mechanism, a charging mechanism and a proposed discharge detection mechanism, the discharging mechanism includes a recovery tank 101, a vacuum pump 102, a tank connecting pipe 103 is connected between the exhaust end of the vacuum pump 102 and the recovery tank 101, a discharge solenoid valve 105 is arranged on the tank connecting pipe 103, an air inlet end of the vacuum pump 102 is connected with a discharge pipe 104, the proposed discharge detection mechanism includes a transfer box 201, an end of the discharge pipe 104 away from the vacuum pump 102 is connected to the transfer box 201, a detection gas cylinder 202 is arranged above the transfer box 201, a detection outlet pipe 203 is connected between the detection gas cylinder 202 and the transfer box 201, and the detection storage A detection piston plate 204 is provided in the gas cylinder 202 and is slidably and tightly connected thereto. An elastic suspension rope 205 is fixedly connected between the detection piston plate 204 and the inner wall of the top end of the detection gas storage cylinder 202. The end of the transfer box 201 away from the discharge pipe 104 is connected to a row of pipes 206. An electric push rod 207 for adjusting the seal is fixedly installed in the transfer box 201. A sealing plate 208 is fixedly connected to the output end of the electric push rod 207. The sealing plate 208 is slidably and tightly connected to the row of pipes 206. An air pressure sensor 106 is fixedly installed in the recovery tank 101. A reflux pipe 209 is connected between the detection pipe 203 and the recovery tank 101. A reflux solenoid valve 210 is provided on the reflux pipe 209.

[0034] The proposed discharge detection mechanism also includes a proposed inspection intelligent control system, which includes a proposed inspection setting module, a proposed inspection control module, a proposed inspection analysis module, and a ring feedback module. The proposed inspection setting module is signal-connected to the proposed inspection analysis module, the proposed inspection control module is signal-connected to the vacuum pump 102, the discharge solenoid valve 105, the air pressure sensor 106, and the reflux solenoid valve 210, the air pressure sensor 106 is signal-connected to the proposed inspection analysis module, and the proposed inspection analysis module is signal-connected to the ring feedback module.

[0035] Before starting to discharge the refrigerant, the sealing of the discharge mechanism is first tested by the proposed discharge detection mechanism. Before the test, a pressure range threshold is reasonably set according to the volume under the detection piston plate 204 in the detection air storage cylinder 202 and other parameters. During the test, the proposed test control module will open the discharge solenoid valve 105 and then start the vacuum pump 102. After the vacuum pump 102 is started, the air in the detection air storage cylinder 202 will be extracted through the discharge pipe 104 and the detection outlet pipe 203, and the extracted air will be transported to the recovery tank 10 through the tank connecting pipe 103. 1, the extraction of air by the vacuum pump 102 will cause the detection piston plate 204 to move downward. When the detection piston plate 204 moves to the bottom end of the detection air storage cylinder 202, the simulated inspection control module will turn off the vacuum pump 102 and start the air pressure sensor 106 to detect the air pressure in the recovery storage tank 101. The air pressure data detected by the air pressure sensor 106 will be transmitted to the simulated inspection analysis module, which will compare the air pressure data detected by the air pressure sensor 106 with the air pressure range threshold to determine whether there is a problem with the sealing of the discharge mechanism;

[0036] If there is no problem with the sealing of the discharge mechanism, the air pressure data detected by the air pressure sensor 106 should be within the air pressure range threshold. On the contrary, if the air pressure data detected by the air pressure sensor 106 is not within the air pressure range threshold, it means that there is a problem with the sealing of the discharge mechanism. Therefore, the proposed inspection and analysis module can determine whether there is a problem with the sealing of the discharge mechanism by comparing the air pressure data with the air pressure range threshold. After determining the result, the proposed inspection and analysis module will control the ringing feedback module to emit a corresponding ringing sound according to the determination result to feed back the detection result to the relevant technical personnel. If the detection result is that there is no problem with the sealing of the discharge mechanism, the discharge of the refrigerant can be started directly. If the detection result is that there is a problem with the sealing of the discharge mechanism, it is necessary to perform corresponding maintenance on the discharge mechanism first. The refrigerant can be discharged only after the sealing defect of the discharge mechanism is resolved. After the detection is completed, the proposed inspection control module will close the discharge solenoid valve 105 and open the reflux solenoid valve 210, so that the air drawn out during the detection can flow back to the detection air storage cylinder 202 through the reflux pipe 209, and the detection piston plate 204 moves upward to reset;

[0037] Therefore, through the setting of the simulated discharge detection mechanism, the refrigerant filling and discharge device in the present application will first perform a simulated discharge test before officially discharging the refrigerant to ensure that the sealing of the discharge mechanism is normal, thereby effectively avoiding refrigerant leakage during the refrigerant discharge process, thereby greatly improving the safety and reliability of the device.

[0038] A distance sensor 211 is fixedly installed on the inner wall of the top end of the detection air storage cylinder 202, and the distance sensor 211 is connected to the signal of the simulated inspection control module. During inspection, the distance sensor 211 is used to monitor the distance between it and the detection piston plate 204, and the distance data monitored by the distance sensor 211 will be transmitted to the simulated inspection control module in real time, so that the simulated inspection control module can accurately obtain the real-time position of the detection piston plate 204 according to the distance data monitored by the distance sensor 211, so that the simulated inspection control module can turn off the vacuum pump 102 in time when the detection piston plate 204 moves to the bottom end of the detection air storage cylinder 202, so as to avoid damage to the vacuum pump 102.

[0039] A pressure-regulating electric push rod 109 is fixedly installed on the inner wall of the top end of the recovery tank 101, and the output end of the pressure-regulating electric push rod 109 is fixedly connected to a pressure-regulating piston plate 110 which is slidingly and sealingly connected to the recovery tank 101. The tank connecting pipe 103, the outlet pipe 107, and the reflux pipe 209 are all located below the pressure-regulating piston plate 110. The intelligent control system to be inspected also includes a discharge control module, and the discharge control module is signal-connected to the vacuum pump 102, the discharge solenoid valve 105, the sealing electric push rod 207, and the pressure-regulating electric push rod 109, and the air pressure sensor 106 is also signal-connected to the discharge control module.

[0040] The sealing tube plate 208 is set to be L-shaped, and the sealing tube plate 208 consists of a horizontal section and a vertical section. The vertical section is slidably and sealedly connected to the continuous tube 206, and the horizontal section matches the detection tube 203. The horizontal section and the sealing electric push rod 207 are both located directly below the detection tube 203. When setting the air pressure range threshold, it is also necessary to set it based on the volume below the pressure regulating piston plate 110 in the recovery tank 101. The pressure regulating piston plate 110 can limit the volume in the recovery tank 101 during detection, so that the air pressure change is more obvious, thereby improving the accuracy of the detection. When discharging the refrigerant, the continuous tube 206 is connected to the discharge interface on the refrigeration equipment, and the discharge control module will control the sealing electric push rod 207 to push the sealing tube plate 208 to move upward, so that the sealing tube plate 208 is separated from the continuous tube 206. The discharge pipe 206 is opened to make the connected pipe 206 conductive, until the sealing electric push rod 207 abuts against the bottom end of the detection pipe 203 to block and seal the detection pipe 203 to prevent the detection pipe 203, the transfer box 201, etc. from affecting the discharge of the refrigerant. Then, the discharge control module will open the tank pipe 103 and start the vacuum pump 102 to extract the refrigerant in the refrigeration equipment and transport the refrigerant to the recovery tank 101, thereby realizing the discharge of the refrigerant. In the process of discharging the refrigerant, as the air pressure below the pressure regulating piston plate 110 increases, the discharge control module will gradually control the pressure regulating electric push rod 109 to drive the pressure regulating piston plate 110 to move upward, so as to accommodate more refrigerant and avoid excessive air pressure below the pressure regulating piston plate 110.

[0041] There are multiple pressure relief pipes 111 connected to the side wall of the recovery tank 101. The pressure relief pipes 111 are located above the pressure regulating piston plate 110. The end of the pressure relief pipe 111 away from the recovery tank 101 is sealed and fixedly connected with an elastic sealing membrane 112 that matches it. When the pressure regulating electric push rod 109 pulls the pressure regulating piston plate 110 to move upward, the air pressure above the pressure regulating piston plate 110 will increase. The increase in air pressure will cause the elastic sealing membrane 112 to bulge outward and deform, thereby playing a pressure relief role and avoiding excessive air pressure above the pressure regulating piston plate 110.

[0042] The filling mechanism includes a refrigerant cylinder 301 and a filling pipe 302 connected to the refrigerant cylinder 301. The filling pipe 302 is provided with a flow meter 303 and a filling solenoid valve 304. When filling the refrigerant, the end of the filling pipe 302 away from the refrigerant cylinder 301 is connected to the filling interface on the refrigeration equipment. The filling solenoid valve 304 can be opened to fill the refrigerant. The side wall of the recovery tank 101 is connected with a derivation pipe 107. The derivation pipe 107 is provided with a derivation valve 108. By opening the derivation valve 108, the refrigerant in the recovery tank 101 can be discharged through the derivation pipe 107. The discharge pipe 104 is provided with a discharge check valve 113. The discharge check valve 113 is used to prevent the refrigerant from flowing back.

[0043] The second implementation method:

[0044] Figure 7-10 A refrigerant filling and discharging device for refrigeration equipment is shown. Different from the first embodiment, a matching linkage sealing plate 212 is movably arranged below the vertical section, an electromagnet 213 is fixedly installed on the vertical section, a linkage iron block 214 is fixedly installed on the linkage sealing plate 212, and a push rod 215 is also fixedly installed on the top inner wall of the detection air storage cylinder 202. The simulated intelligent control system also includes a self-test control module, which is signal-connected to the pressure-regulating electric push rod 109, the sealing electric push rod 207, the reflux solenoid valve 210, and the electromagnet 213.

[0045] In order to prevent the sealing property of the intended discharge detection mechanism from affecting the accuracy of the detection, in the present embodiment, before the discharge mechanism is detected, the intended discharge detection mechanism will be self-checked first. During the self-check, the self-check control module will first control the electromagnet 213 to be energized, so as to connect the sealing plate 208 and the linkage sealing plate 212 through the magnetic attraction between the electromagnet 213 and the linkage iron block 214. Then, the self-check control module will control the sealing electric push rod 207 to push the sealing plate 208 upward until the sealing plate 208 and the detection tube 203 are abutted to block and seal the detection tube 203. When the sealing plate 208 moves upward, the linkage sealing plate 212 will move upward together with it. After the sealing plate 208 is separated from the continuous tube 206, the linkage sealing plate 212 will replace the sealing plate 208 to continue to block and seal the continuous tube 206. The continuous discharge pipe 206 remains in a non-conducting state, and then the self-check control module opens the reflux solenoid valve 210 (the discharge solenoid valve 105 is in a closed state), and controls the pressure-regulating electric push rod 109 to push the pressure-regulating piston plate 110 downward by a certain distance (the downward movement of the pressure-regulating piston plate 110 will increase the air pressure in the detection air storage cylinder 202, causing the detection piston plate 204 to move upward until it abuts against the push rod 215. After the detection piston plate 204 abuts against the push rod 215, the pressure-regulating piston plate 110 will also move downward by a short distance), and then the self-check control module starts the air pressure sensor 106, so that the air pressure sensor 106 continuously monitors the air pressure in the pressure-regulating piston plate 110, so that the proposed inspection analysis module determines whether there is a defect in the sealing of the proposed discharge detection mechanism by analyzing the air pressure data monitored by the air pressure sensor 106;

[0046] If the sealing performance of the intended discharge detection mechanism itself is good, the air pressure in the pressure regulating piston plate 110 will be in a stable state. On the contrary, if the intended discharge detection mechanism has a sealing defect, the air pressure in the pressure regulating piston plate 110 will continue to drop. Therefore, the intended inspection analysis module can determine whether there is a sealing defect in the intended discharge detection mechanism by analyzing the air pressure data monitored by the air pressure sensor 106. After determining the result, the intended inspection analysis module will control the ringing feedback module to emit a corresponding ringing sound to feed back the result of the self-inspection to the relevant technical personnel. After the self-inspection is completed, the self-inspection control module will close the reflux solenoid valve 210, and control the sealing electric push rod 207 to pull the sealing tube plate 208 to move downward and reset, and control the pressure regulating electric push rod 109 to pull the pressure regulating piston plate 110 to move upward and reset. After the sealing tube plate 208 is reset, the self-inspection control module will control the electromagnet 213 to cut off the power.

[0047] Therefore, through the joint setting of the linkage sealing plate 212, the electromagnet 213, the linkage iron block 214, etc., before the discharge mechanism is detected, the intended discharge detection mechanism will first perform a self-inspection to ensure the accuracy and reliability of the detection of the discharge mechanism, thereby further improving the safety and reliability of the device.

[0048] In addition, since the electromagnet 213 is energized, the linkage sealing plate 212 will move along with the sealing tube plate 208. When the refrigerant in the refrigeration equipment is discharged, the electromagnet 213 will not be energized, so the linkage sealing plate 212 will not block and seal the row of pipes 206. The linkage sealing plate 212 will not affect the discharge of the refrigerant, and the discharge of the refrigerant can proceed smoothly.

[0049] The bottom end of the support rod 215 is lower than the bottom end of the distance sensor 211. The support rod 215 can protect the distance sensor 211 to prevent the detection piston plate 204 from squeezing the distance sensor 211 during self-test. Both sides of the linkage sealing plate 212 are provided with guide plates 216 fixedly installed on the inner wall of the bottom end of the transfer box 201. The linkage sealing plate 212 is slidably connected with the guide plate 216. The guide plate 216 can play a guiding role to prevent the linkage sealing plate 212 from deviating, thereby ensuring the blocking and sealing effect of the linkage sealing plate 212 on the row of pipes 206.

[0050] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. 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 scope of protection of the present invention.

Claims

1. A refrigerant charging and discharging device for refrigeration equipment, comprising a discharging mechanism and a charging mechanism, wherein the discharging mechanism comprises a recovery tank (101) and a vacuum pump (102), a tank connecting pipe (103) is connected between the exhaust end of the vacuum pump (102) and the recovery tank (101), a discharge solenoid valve (105) is provided on the tank connecting pipe (103), and the air inlet end of the vacuum pump (102) is connected to a discharge pipe (104), characterized in that: The invention also comprises a pre-empty detection mechanism, wherein the pre-empty detection mechanism comprises a transfer box (201), one end of the discharge pipe (104) away from the vacuum pump (102) is connected to the transfer box (201), a detection gas storage cylinder (202) is arranged above the transfer box (201), a detection outlet pipe (203) is connected between the detection gas storage cylinder (202) and the transfer box (201), a detection piston plate (204) is arranged in the detection gas storage cylinder (202) and is slidably and sealingly connected thereto, and an elastic suspension rope (205) is fixedly connected between the detection piston plate (204) and the inner wall of the top end of the detection gas storage cylinder (202). The end of the transfer box (201) away from the discharge pipe (104) is connected to a row of pipes (206); a sealing electric push rod (207) is fixedly installed in the transfer box (201); a sealing plate (208) is fixedly connected to the output end of the sealing electric push rod (207); the sealing plate (208) is slidably sealedly connected to the row of pipes (206); an air pressure sensor (106) is fixedly installed in the recovery tank (101); a reflux pipe (209) is connected between the detection pipe (203) and the recovery tank (101); and a reflux solenoid valve (210) is provided on the reflux pipe (209).

2. A refrigerant charging and discharging device for refrigeration equipment according to claim 1, characterized in that: The proposed discharge detection mechanism also includes a proposed inspection intelligent control system, which includes a proposed inspection setting module, a proposed inspection control module, a proposed inspection analysis module, and a ring feedback module. The proposed inspection setting module is signal-connected to the proposed inspection analysis module, the proposed inspection control module is signal-connected to the vacuum pump (102), the discharge solenoid valve (105), the air pressure sensor (106), and the reflux solenoid valve (210), the air pressure sensor (106) is signal-connected to the proposed inspection analysis module, and the proposed inspection analysis module is signal-connected to the ring feedback module.

3. The refrigerant charging and discharging device for refrigeration equipment according to claim 1, characterized in that: The charging mechanism comprises a refrigerant cylinder (301), a charging pipe (302) connected to the refrigerant cylinder (301), a flow meter (303) and a charging solenoid valve (304) are arranged on the charging pipe (302), a side wall of the recovery storage tank (101) is connected to a derivation pipe (107), a derivation valve (108) is arranged on the derivation pipe (107), and a discharge check valve (113) is arranged on the discharge pipe (104).

4. The refrigerant charging and discharging device for refrigeration equipment according to claim 2, characterized in that: A distance sensor (211) is fixedly mounted on the inner wall of the top end of the detection gas storage cylinder (202), and the distance sensor (211) is signal-connected to the control module to be detected.

5. The refrigerant charging and discharging device for refrigeration equipment according to claim 2, characterized in that: The tube sealing plate (208) is configured to be L-shaped. The tube sealing plate (208) is composed of a horizontal section and a vertical section. The vertical section is slidably and sealingly connected to the row of tubes (206). The horizontal section matches the detection tube (203). The horizontal section and the sealing electric push rod (207) are both located directly below the detection tube (203).

6. The refrigerant charging and discharging device for refrigeration equipment according to claim 1, characterized in that: A plurality of pressure relief pipes (111) are connected to the side wall of the recovery tank (101), and the pressure relief pipes (111) are located above the pressure regulating piston plate (110). One end of the pressure relief pipe (111) away from the recovery tank (101) is sealed and fixedly connected to an elastic sealing membrane (112) matching the same.

7. The refrigerant charging and discharging device for refrigeration equipment according to claim 5, characterized in that: A pressure regulating electric push rod (109) is fixedly installed on the inner wall of the top end of the recovery tank (101); the output end of the pressure regulating electric push rod (109) is fixedly connected to a pressure regulating piston plate (110) which is slidingly and sealingly connected to the recovery tank (101); the tank connecting pipe (103), the outlet pipe (107), and the return pipe (209) are all located below the pressure regulating piston plate (110); the simulated inspection intelligent control system also includes a discharge control module; the discharge control module is signal-connected to the vacuum pump (102), the discharge solenoid valve (105), the sealing electric push rod (207), and the pressure regulating electric push rod (109); and the air pressure sensor (106) is also signal-connected to the discharge control module.

8. The refrigerant charging and discharging device for refrigeration equipment according to claim 7, characterized in that: A linkage sealing plate (212) matching with the vertical section is movably arranged below the vertical section, an electromagnet (213) is fixedly mounted on the vertical section, a linkage iron block (214) is fixedly mounted on the linkage sealing plate (212), and a support rod (215) is also fixedly mounted on the inner wall of the top end of the detection gas storage cylinder (202).

9. The refrigerant charging and discharging device for refrigeration equipment according to claim 8, characterized in that: The simulated inspection intelligent control system also includes a self-inspection control module, and the self-inspection control module is signal-connected to the pressure-adjusting electric push rod (109), the sealing-adjusting electric push rod (207), the reflux electromagnetic valve (210), and the electromagnet (213).

10. The refrigerant charging and discharging device for refrigeration equipment according to claim 9, characterized in that: The bottom end of the support rod (215) is lower than the bottom end of the distance sensor (211), and support rods (215) fixedly mounted on the inner wall of the bottom end of the transfer box (201) are arranged on both sides of the linkage sealing plate (212), and the linkage sealing plate (212) is slidably connected to the guide plate (216).

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