Automatic refrigerant filling device for refrigeration equipment

Abstract

According to the automatic refrigerant filling device for the refrigeration equipment, the automatic refrigerant filling device is applied to the field of the refrigeration equipment, through cooperative arrangement of a tension spring and a distance sensor, refrigerants can be automatically added into the refrigeration equipment, and under the condition that the refrigerants are about to be completely filled, liquid refrigerants are converted into gaseous refrigerants to be filled; according to the refrigerant filling device, residual liquid refrigerant in a pipeline can be emptied, the residual refrigerant in the pipeline is greatly reduced, the refrigerant filling accuracy is improved, waste is further avoided, through the arrangement of an evaporation pipe and the like, a tension spring can be automatically calibrated, the refrigerant filling accuracy is further improved, and through the arrangement of a filling pipe, a collecting pipe and the like, the refrigerant filling accuracy is further improved. Refrigerant in the backflow pipe, the temperature adjusting pipe and the main discharging pipe can be sucked into the collecting pipe, the refrigerant is prevented from leaking into the air, and the sealing performance of the filling device can be self-detected.

Description

Technical Field

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

[0002] Refrigerant filling equipment is used to accurately inject refrigerant into the refrigeration system to ensure its normal operation. It mainly includes a weighing device and a connecting pipeline, and is widely used in the production and maintenance of air conditioners, cold storages, and refrigeration equipment.

[0003] Chinese Patent with Publication No. CN119554810A discloses a refrigerant filling device and a filling method. A weighing member, a pressure measuring module, and a regulating valve group are all communicatively connected to an external control component, and the control component monitors and controls the detection data to facilitate automatic and accurate control of the filling process.

[0004] Chinese Patent with Publication No. CN102213510A discloses a fully automatic refrigerant weight metering filling machine. The invention has a reasonable structural design. First, the refrigerant in the large raw material bottle is pumped into a small metering bottle by a liquid delivery pump. Because the capacity of the metering bottle is relatively small, it is placed on an electronic scale with a small range, and an electronic scale of the balance level can be used for the electronic scale, so the accuracy will be very high and the filling error will be very small.

[0005] In the above patents, different weighing devices are used to calculate the filling amount of the refrigerant. Due to different ambient temperatures, there is a certain error when the weighing equipment works in different environments, resulting in an error in the filling amount. Therefore, further improvement is needed. Summary of the Invention

[0006] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is that different weighing devices are used to calculate the filling amount of the refrigerant. Due to different ambient temperatures, there is a certain error when the weighing equipment works in different environments, resulting in an error in the filling amount.

[0007] To solve the above problems, the present invention provides an automatic refrigerant charging device for a refrigeration equipment, which includes a bracket. A top buckle frame is fixedly connected to the top of the bracket. A bottom buckle frame is slidably connected to the inner wall of the top buckle frame. A can placing rack is fixedly connected to the bottom end of the bottom buckle frame. A refrigerant can is placed inside the can placing rack. A tension spring is fixedly connected between the bottom end of the bottom buckle frame and the top end of the top buckle frame. A distance sensor is fixedly connected to the side wall of the bottom end of the bracket. A reference plate is fixedly connected to the side wall of the can placing rack and is directly above the distance sensor. A main discharge pipe is fixedly connected to one end of the refrigerant can. An air tank is fixedly connected to the side wall of the bracket. A sealing plug is slidably connected to the inner wall of the air tank. A temperature regulating pipe and a return pipe are fixedly connected to the bottom end of the air tank. An intermediate pipe is fixedly connected between one end of the temperature regulating pipe and one end of the main discharge pipe. A charging pipe is fixedly connected to one end of the intermediate pipe. A connector is fixedly connected to one end of the charging pipe. First valves, second valves, third valves and fourth valves are respectively installed at one ends of the main discharge pipe, the temperature regulating pipe, the charging pipe and the return pipe. An evaporation pipe is communicated with the temperature regulating pipe.

[0008] As a further improvement of the present application, a cold collection box is sleeved outside the evaporation pipe. A blower is fixedly connected to the side wall of the cold collection box. A first cold air duct is communicated between the top end of the cold collection box and the top buckle frame. A mixing pipe is fixedly connected to the outer wall of the first cold air duct.

[0009] As a further improvement of the present application, an electric valve is fixedly connected to one end of the mixing pipe. A temperature sensor is fixedly connected to the inner wall of the top buckle frame. The temperature sensor is electrically connected to the electric valve.

[0010] As a further improvement of the present application, a heat exchange pipe is also communicated with the temperature regulating pipe. A replacement box is sleeved outside the outer wall of the heat exchange pipe. A second cold air duct is communicated between the bottom end of the replacement box and the top buckle frame. A discharge pipe is fixedly connected to the bottom end of the replacement box.

[0011] As another improvement of the present application, a collection pipe is fixedly connected to the top end of the intermediate pipe. A connecting pipe is communicated between the collection pipe and the intermediate pipe. A one-way valve is fixedly connected to the outer wall of the connecting pipe. A pressure sensor is fixedly connected to the inner wall of the intermediate pipe.

[0012] As a supplementary improvement of the present application, an electric rod is fixedly connected to the top end of the collection pipe. A suction piston is fixedly connected to the output end of the electric rod. The suction piston is hermetically slidably connected to the inner wall of the collection pipe. The pressure sensor is electrically connected to the electric rod.

[0013] As a supplementary improvement of the present application, a counterweight is fixedly connected to the top end of the sealing plug. Through the above setting, the counterweight can assist the sealing plug to discharge the gaseous refrigerant inside the air tank.

[0014] As another improvement of the present application, both the main discharge pipe and the return pipe are made of flexible materials. Through the above setting, it is avoided that the main discharge pipe and the return pipe affect the lifting of the refrigerant can.

[0015] In summary, through the cooperative setting of the tension spring and the distance sensor, the present invention can automatically add refrigerant into the refrigeration equipment, and when the refrigerant is about to be filled up, convert the liquid refrigerant into gaseous refrigerant for filling, which can empty the residual liquid refrigerant in the pipeline, greatly reduce the residual refrigerant in the pipeline, improve the accuracy of refrigerant filling, and also avoid waste;

[0016] Also, through the setting of the evaporation pipe, etc., the temperature in the upper buckling frame can be adjusted to achieve the function of temperature control, so that the temperature of the upper buckling frame remains constant. At this time, the tension spring can drive the refrigerant tank to move more accurately. The above settings can automatically calibrate the tension spring and further improve the filling accuracy of the refrigerant;

[0017] Also, through the setting of the filling pipe and the collection pipe, etc., when the pressure inside the return pipe, the temperature control pipe and the filling pipe becomes small, it indicates that there may be a leakage. Then the pressure received by the pressure sensor will become small. At this time, the electric rod is started to drive the air extraction piston to move upward, and the refrigerant inside the return pipe, the temperature control pipe and the main discharge pipe can be pumped into the inside of the collection pipe, which not only prevents the refrigerant from leaking into the air, but also can self-check the sealing performance of the filling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view of the whole in the first and second embodiments of the present application;

[0019] Figure 2 It is the state diagram when the liquid refrigerant inside the refrigerant tank in the first embodiment of the present application is filled through the filling pipe;

[0020] Figure 3 It is the state diagram when the liquid refrigerant inside the refrigerant tank in the first and second embodiments of the present application becomes gaseous through the evaporation pipe and enters the gas tank;

[0021] Figure 4 It is the state diagram when the gaseous refrigerant inside the gas tank in the first and second embodiments of the present application enters the inside of the filling pipe through the main discharge pipe and the temperature control pipe;

[0022] Figure 5 It is the state diagram when the cold energy released by the evaporation pipe in the first and second embodiments of the present application is discharged through the upper buckling frame and the replacement box;

[0023] Figure 6 It is the front sectional view of the collection pipe in the first and second embodiments of the present application.

[0024] Explanation of the reference numerals in the drawings:

[0025] 1. Bracket; 2. Upper clamping frame; 3. Lower clamping frame; 4. Tank placement rack; 5. Refrigerant tank; 6. Tension spring; 7. Pressure sensor; 8. Distance sensor; 9. Reference plate; 10. Exhaust piston; 11. Electric rod; 12. Main discharge pipe; 1201. First valve; 13. Gas tank; 1301. Counterweight; 1302. Sealing plug; 14. Temperature control pipe; 1401. Second valve; 15. Evaporation pipe; 1501. Cold collection box; 1502. Blower; 16. Filling pipe; 1601. Connector; 1602. Second valve; 18. Return pipe; 1801. Third valve; 19. Intermediate pipe; 20. Connecting pipe; 21. Check valve; 22. Collection pipe; 23. Mixing pipe; 24. Electric valve; 25. Temperature sensor; 26. Heat exchange pipe; 2601. Replacement box; 2602. Discharge pipe; 2603. Second cold air duct; 27. First cold air duct. Specific embodiments

[0026] The following will describe in detail two embodiments of the present application with reference to the accompanying drawings.

[0027] The first embodiment:

[0028] Figures 1-5 An automatic refrigerant filling device for a refrigeration equipment is shown, which includes a bracket 1. The top end of the bracket 1 is fixedly connected with an upper clamping frame 2. The inner wall of the upper clamping frame 2 is slidably connected with a lower clamping frame 3. The bottom end of the lower clamping frame 3 is fixedly connected with a tank placement rack 4. A refrigerant tank 5 is placed inside the tank placement rack 4. A tension spring 6 is fixedly connected between the bottom end of the lower clamping frame 3 and the top end of the upper clamping frame 2. The side wall of the bottom end of the bracket 1 is fixedly connected with a distance sensor 8. The side wall of the tank placement rack 4 is fixedly connected with a reference plate 9. The reference plate 9 is located directly above the distance sensor 8. One end of the refrigerant tank 5 is fixedly connected with a main discharge pipe 12. The side wall of the bracket 1 is fixedly connected with a gas tank 13. A sealing plug 1302 is slidably connected inside the gas tank 13. The bottom end of the gas tank 13 is fixedly connected with a temperature control pipe 14 and a return pipe 18. One end between the temperature control pipe 14 and the main discharge pipe 12 is fixedly connected with an intermediate pipe 19. One end of the intermediate pipe 19 is fixedly connected with a filling pipe 16. One end of the filling pipe 16 is fixedly connected with a connector 1601. First valves 1201, second valves 1401, third valves 1602 and fourth valves 1801 are respectively installed at one ends of the main discharge pipe 12, the temperature control pipe 14, the filling pipe 16 and the return pipe 18. An evaporation pipe 15 is communicated with the temperature control pipe 14.

[0029] Under the action of gravity, the refrigerant tank 5 can stretch the tension spring 6 to move the reference plate 9 downward. When the refrigerant inside the refrigerant tank 5 decreases, the weight of the refrigerant tank 5 decreases, and the tension spring 6 contracts uniformly as the weight of the refrigerant tank 5 decreases. Therefore, the filling amount of the refrigerant in the refrigerant tank 5 can be calculated based on the contraction length of the tension spring 6.

[0030] Before adding refrigerant into the refrigeration device, connect it with the refrigeration device using the connector 1601. The weight of the refrigerant that needs to be filled in the refrigeration device is y. After subtracting y from the weight of the refrigerant tank 5, the height rises by z.

[0031] When adding refrigerant, open the first valve 1201 and the third valve 1602, and close the fourth valve 1801 and the second valve 1401. At this time, the refrigerant in the refrigerant tank 5 enters the interior of the refrigeration device in a liquid state through the main discharge pipe 12 and the filling pipe 16. When the rising height of the refrigerant tank 5 reaches 70% to 90% of z, close the third valve 1602 and the fourth valve 1801 to stop filling the liquid refrigerant into the refrigeration device, and open the first valve 1201 and the second valve 1401.

[0032] At this time, the refrigerant in the refrigerant tank 5 enters the interior of the gas tank 13 through the main discharge pipe 12 and the temperature control pipe 14. When the refrigerant passes through the evaporation pipe 15, it evaporates into a gas and enters the interior of the gas tank 13 in a liquid state, pushing the sealing plug 1302 upward. When the rising height of the refrigerant tank 5 reaches z, close the first valve 1201, and open the fourth valve 1801, the third valve 1602 and the second valve 1401. At this time, the sealing plug 1302 moves downward to fill the gaseous refrigerant inside the gas tank 13 into the refrigeration device.

[0033] With the above settings, through the cooperative setting of the tension spring 6 and the distance sensor 8, the refrigerant can be automatically added into the refrigeration device. And in the case that the refrigerant is about to be filled up, the liquid refrigerant is converted into gaseous refrigerant for filling, which can empty the residual liquid refrigerant in the pipeline, greatly reducing the residual refrigerant in the pipeline, improving the accuracy of refrigerant filling, and also avoiding waste.

[0034] A cold collection box 1501 is sleeved outside the evaporation pipe 15. A blower 1502 is fixedly connected to the side wall of the cold collection box 1501. A first cold air pipe 27 is connected between the top end of the cold collection box 1501 and the upper buckle frame 2. A mixing pipe 23 is fixedly connected to the outer wall of the first cold air pipe 27. One end of the mixing pipe 23 is fixedly connected to an electric valve 24. A temperature sensor 25 is fixedly connected to the inner wall of the upper buckle frame 2. The temperature sensor 25 is electrically connected to the electric valve 24.

[0035] With the above settings, when the liquid refrigerant evaporates into a gas through the evaporation pipe 15, a large amount of cold energy will be released. At this time, starting the blower 1502 can transfer the cold energy to the inside of the upper clamping frame 2 through the first cold air pipe 27. When the cold energy flows inside the first cold air pipe 27, the outside air can be mixed with the cold energy through the mixing pipe 23. By controlling the opening and closing size of the electric valve 24 through the temperature sensor 25, the air intake volume of the mixing pipe 23 can be controlled, the temperature inside the upper clamping frame 2 can be adjusted, and the temperature control function can be achieved, so that the temperature of the upper clamping frame 2 remains constant. At this time, the tension spring 6 can drive the refrigerant tank 5 to move more accurately. The above settings can automatically calibrate the tension spring 6 and further improve the filling accuracy of the refrigerant.

[0036] The second implementation method:

[0037] Figure 1 and Figures 3-6 A refrigerant automatic filling device for a refrigeration equipment is shown. Different from the first implementation method, a heat exchange pipe 26 is also connected to the temperature adjustment pipe 14. A replacement box 2601 is sleeved on the outer wall of the heat exchange pipe 26. A second cold air pipe 2603 is connected between the bottom end of the replacement box 2601 and the upper clamping frame 2. A discharge pipe 2602 is fixedly connected to the bottom end of the replacement box 2601.

[0038] With the above settings, the cold energy inside the upper clamping frame 2 can be discharged into the inside of the replacement box 2601 through the second cold air pipe 2603. At this time, the gaseous refrigerant inside the temperature adjustment pipe 14 can play a role in cooling when passing through the heat exchange pipe 26.

[0039] After the refrigerant filling is completed, close the third valve 1602 and the first valve 1201, open the second valve 1401 and the fourth valve 1801, so that the gaseous refrigerant remaining inside the reflux pipe 18, the total discharge pipe 12 and the temperature adjustment pipe 14 after filling is in a low-temperature state. When the low-temperature gaseous refrigerant gradually returns to normal temperature, the pressure inside the reflux pipe 18, the temperature adjustment pipe 14 and the filling pipe 16 increases.

[0040] A collecting pipe 22 is fixedly connected to the top end of the intermediate pipe 19. A connecting pipe 20 is connected between the collecting pipe 22 and the intermediate pipe 19. A one-way valve 21 is fixedly connected to the outer wall of the connecting pipe 20. A pressure sensor 7 is fixedly connected to the inner wall of the intermediate pipe 19. An electric rod 11 is fixedly connected to the top end of the collecting pipe 22. The output end of the electric rod 11 is fixedly connected to an air extraction piston 10. The air extraction piston 10 is hermetically slidably connected to the inner wall of the collecting pipe 22. The pressure sensor 7 is electrically connected to the electric rod 11.

[0041] With the above settings, when the pressure inside the return pipe 18, the temperature control pipe 14, and the filling pipe 16 decreases, it indicates that a leakage may occur. Then the pressure received by the pressure sensor 7 will decrease. At this time, the electric rod 11 is activated to drive the air extraction piston 10 to move upward, and the refrigerant inside the return pipe 18, the temperature control pipe 14, and the main discharge pipe 12 can be pumped into the inside of the collection pipe 22 to prevent the refrigerant from leaking into the air. The above settings can play a role in self-checking the sealing performance of the filling device and prevent leakage when filling the refrigerant.

[0042] A weight block 1301 is fixedly connected to the top of the sealing plug 1302. With the above settings, the weight block 1301 can assist the sealing plug 1302 to discharge the gaseous refrigerant inside the gas tank 13. Both the main discharge pipe 12 and the return pipe 18 are made of flexible materials. With the above settings, it is avoided that the main discharge pipe 12 and the return pipe 18 affect the lifting of the refrigerant tank 5.

[0043] Combined with the current actual requirements, the above implementation manner adopted in this application, the protection scope is not limited to this. Within the scope of knowledge possessed by those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A refrigerant automatic charging device for refrigeration equipment, comprising a bracket (1), characterized in that: The top of the bracket (1) is fixedly connected to an upper buckle frame (2), the inner wall of the upper buckle frame (2) is slidably connected to a lower buckle frame (3), the bottom end of the lower buckle frame (3) is fixedly connected to a can rack (4), a refrigerant tank (5) is placed inside the can rack (4), a tension spring (6) is fixedly connected between the bottom end of the lower buckle frame (3) and the top end of the upper buckle frame (2), a side wall of the bottom end of the bracket (1) is fixedly connected to a distance sensor (8), the side wall of the can rack (4) is fixedly connected to a reference plate (9), the reference plate (9) is located directly above the distance sensor (8), one end of the refrigerant tank (5) is fixedly connected to a main drain pipe (12), the side wall of the bracket (1) is fixedly connected to a gas tank (13), the gas tank The inner wall of the gas tank (13) is slidably connected with a sealing plug (1302); the bottom end of the gas tank (13) is fixedly connected with a temperature regulating tube (14) and a return tube (18); an intermediate tube (19) is fixedly connected between the temperature regulating tube (14) and one end of the main exhaust tube (12); one end of the intermediate tube (19) is fixedly connected with a filling tube (16); one end of the filling tube (16) is fixedly connected with a joint (1601); one end of the main exhaust tube (12), the temperature regulating tube (14), the filling tube (16) and the return tube (18) are respectively installed with a first valve (1201), a second valve (1401), a third valve (1602) and a fourth valve (1801); and the temperature regulating tube (14) is connected with an evaporation tube (15).

2. The automatic refrigerant charging device for refrigeration equipment according to claim 1, characterized in that: A cold air collecting box (1501) is sleeved on the outer side of the evaporating tube (15), a blower (1502) is fixedly connected to the side wall of the cold air collecting box (1501), a first cold air duct (27) is connected between the top of the cold air collecting box (1501) and the upper buckle frame (2), and a mixing tube (23) is fixedly connected to the outer wall of the first cold air duct (27).

3. The automatic refrigerant charging device for refrigeration equipment according to claim 1, characterized in that: One end of the mixing tube (23) is fixedly connected to an electric valve (24), the inner wall of the buckle frame (2) is fixedly connected to a temperature sensor (25), and the temperature sensor (25) and the electric valve (24) are electrically connected.

4. The automatic refrigerant charging device for refrigeration equipment according to claim 1, characterized in that: The temperature regulating tube (14) is also connected to a heat exchange tube (26); a replacement box (2601) is provided on the outer wall of the heat exchange tube (26); a second cold air tube (2603) is connected between the bottom end of the replacement box (2601) and the upper buckle frame (2); and a discharge pipe (2602) is fixedly connected to the bottom end of the replacement box (2601).

5. The automatic refrigerant charging device for refrigeration equipment according to claim 1, characterized in that: The top end of the intermediate tube (19) is fixedly connected to a collecting tube (22), a connecting tube (20) is connected between the collecting tube (22) and the intermediate tube (19), a one-way valve (21) is fixedly connected to the outer wall of the connecting tube (20), and a pressure sensor (7) is fixedly connected to the inner wall of the intermediate tube (19).

6. The automatic refrigerant charging device for refrigeration equipment according to claim 1, characterized in that: The top end of the collecting tube (22) is fixedly connected to an electric rod (11), the output end of the electric rod (11) is fixedly connected to an air extraction piston (10), the air extraction piston (10) is sealingly slidably connected to the inner wall of the collecting tube (22), and the pressure sensor (7) is electrically connected to the electric rod (11).

7. The automatic refrigerant charging device for refrigeration equipment according to claim 1, characterized in that: The top end of the sealing plug (1302) is fixedly connected to a counterweight block (1301).

8. The automatic refrigerant charging device for refrigeration equipment according to claim 1, characterized in that: The main discharge pipe (12) and the return pipe (18) are both made of flexible materials.

Images