A refrigerant automatic charging device for a refrigeration apparatus

Abstract

This invention relates to an automatic refrigerant charging device for refrigeration equipment. Through the combined use of a tension spring and a distance sensor, the device automatically adds refrigerant to the refrigeration equipment. When the refrigerant is almost fully charged, it converts the liquid refrigerant into a gaseous state for charging, effectively venting any residual liquid refrigerant from the pipes. This significantly reduces the amount of refrigerant remaining in the pipes, improves the accuracy of refrigerant charging, and avoids waste. Furthermore, the evaporator tube and other components allow for automatic calibration of the tension spring, further enhancing the charging accuracy. The charging pipe and collection pipe also allow refrigerant from the return pipe, temperature control pipe, and main drain pipe to be drawn into the collection pipe, preventing refrigerant leakage into the air and providing a self-checking function for the sealing of the charging device.

Description

Technical Field

[0001] This invention relates to an automatic refrigerant charging device, and more particularly to an automatic refrigerant charging device for refrigeration equipment used in the field of refrigeration equipment. Background Technology

[0002] Refrigerant charging equipment is used to accurately inject refrigerant into refrigeration systems to ensure their normal operation. It mainly includes weighing devices and connecting pipelines, and is widely used in the production and maintenance of air conditioning, cold storage and refrigeration equipment.

[0003] Chinese patent CN119554810A discloses a refrigerant charging device and charging method. It uses a control component that is communicatively connected to an external control unit, which monitors and controls the detection data to automatically and accurately control the charging process.

[0004] Chinese patent CN102213510A discloses a fully automatic refrigerant weighing and metering filling machine. The invention has a reasonable structural design. The refrigerant in the large raw material bottle is first pumped into a small metering bottle using a liquid transfer pump. Because the capacity of the metering bottle is relatively small, it is placed on an electronic scale with a small range. The electronic scale can be a balance scale, which will have high accuracy and very small filling error.

[0005] In the aforementioned patents, different weighing devices are used to calculate the refrigerant charge. Due to different ambient temperatures, the weighing devices have certain errors when operating in different environments, resulting in errors in the charge amount. Therefore, further improvements are needed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that when using different weighing devices to calculate the refrigerant charge, the weighing equipment has a certain error when working in different environments due to different ambient temperatures, resulting in errors in the charge amount.

[0007] To address the aforementioned problems, this invention provides an automatic refrigerant charging device for refrigeration equipment, comprising a support frame, an upper retaining frame fixedly connected to the top of the support frame, a lower retaining frame slidably connected to the inner wall of the upper retaining frame, a can holder fixedly connected to the bottom of the lower retaining frame, a refrigerant can being placed inside the can holder, a tension spring fixedly connected between the bottom of the lower retaining frame and the top of the upper retaining frame, a distance sensor fixedly connected to the side wall of the bottom of the support frame, a reference plate fixedly connected to the side wall of the can holder, the reference plate being directly above the distance sensor, a main pipe fixedly connected to one end of the refrigerant can, a gas can fixedly connected to the side wall of the support frame, a sealing plug slidably connected to the inner wall of the gas can, a temperature regulating pipe and a return pipe fixedly connected to the bottom of the gas can, an intermediate pipe fixedly connected between one end of the temperature regulating pipe and one end of the main pipe, a charging pipe fixedly connected to one end of the intermediate pipe, a connector fixedly connected to one end of the charging pipe, a first valve, a second valve, a third valve, and a fourth valve respectively installed at one end of the main pipe, the temperature regulating pipe, the charging pipe, and the return pipe, and an evaporator pipe connected to the temperature regulating pipe.

[0008] As a further improvement of this application, a cold collection box is fitted on the outside of the evaporator tube, a blower is fixedly connected to the side wall of the cold collection box, a first cold air duct is connected between the top of the cold collection box and the upper frame, and a mixing pipe is fixedly connected to the outer wall of the first cold air duct.

[0009] As a further improvement of this application, an electric valve is fixedly connected to one end of the mixing tube, and a temperature sensor is fixedly connected to the inner wall of the upper frame. The temperature sensor and the electric valve are electrically connected.

[0010] As a further improvement of this application, a heat exchange tube is also connected to the temperature regulating tube, and a displacement box is fitted on the outer wall of the heat exchange tube. A second cold air duct is connected between the bottom end of the displacement box and the upper frame, and a discharge pipe is fixedly connected to the bottom end of the displacement box.

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

[0012] As a further improvement to this application, an electric rod is fixedly connected to the top end of the collecting tube, and an air-suction piston is fixedly connected to the output end of the electric rod. The air-suction piston is in a sealed sliding connection with the inner wall of the collecting tube, and a pressure sensor is electrically connected to the electric rod.

[0013] As a further improvement to this application, a counterweight is fixedly connected to the top of the sealing plug. With the above arrangement, the counterweight can assist the sealing plug in discharging the gaseous refrigerant inside the gas tank.

[0014] As another improvement of this application, both the main drain pipe and the return pipe are made of flexible materials. Through the above-mentioned arrangement, the main drain pipe and the return pipe are prevented from affecting the lifting and lowering of the refrigerant tank.

[0015] In summary, this invention, through the combined use of a tension spring and a distance sensor, can automatically add refrigerant to the refrigeration equipment. Furthermore, when the refrigerant is about to be fully charged, it converts the liquid refrigerant into a gaseous refrigerant for charging, thereby emptying any residual liquid refrigerant in the pipes. This greatly reduces the amount of refrigerant remaining in the pipes, improves the accuracy of refrigerant charging, and avoids waste.

[0016] Furthermore, through the evaporator tube and other settings, the temperature inside the upper frame can be adjusted to achieve temperature control and keep the temperature of the upper frame constant. At this time, the tension spring can more accurately drive the refrigerant tank to move. The above settings can automatically calibrate the tension spring, further improving the accuracy of refrigerant charging.

[0017] Furthermore, by using charging pipes and collecting pipes, a decrease in pressure inside the return pipe, temperature regulating pipe, and charging pipe indicates a possible leak. In this case, the pressure sensor will receive a lower pressure, at which point the electric lever will be activated to move the suction piston upward, drawing the refrigerant inside the return pipe, temperature regulating pipe, and main drain pipe into the collecting pipe. This not only prevents refrigerant from leaking into the air but also serves as a self-check for the sealing of the charging device. Attached Figure Description

[0018] Figure 1 This is a front view of the entire embodiment of the first and second embodiments of this application;

[0019] Figure 2 This is a diagram showing the state of the liquid refrigerant inside the refrigerant tank during the charging process through the charging pipe in the first embodiment of this application.

[0020] Figure 3 This is a state diagram of the liquid refrigerant inside the refrigerant tank in the first and second embodiments of this application, when it changes into a gaseous state through the evaporator tube and enters the gas tank.

[0021] Figure 4 This is a state diagram of the gaseous refrigerant in the gas tank entering the charging pipe through the main pipe and the temperature control pipe in the first and second embodiments of this application.

[0022] Figure 5 This is a diagram showing the state of the cold energy released by the evaporator tube in the first and second embodiments of this application as it is discharged through the upper frame and the displacement box.

[0023] Figure 6 This is a frontal cross-sectional view of the collection tube in the first and second embodiments of this application.

[0024] Explanation of the labels in the diagram:

[0025] 1. Bracket; 2. Upper buckle frame; 3. Lower buckle frame; 4. Tank rack; 5. Refrigerant tank; 6. Tension spring; 7. Pressure sensor; 8. Distance sensor; 9. Base plate; 10. Vacuum piston; 11. Electric rod; 12. Main drain pipe; 1201. First valve; 13. Gas tank; 1301. Counterweight; 1302. Sealing plug; 14. Temperature control pipe; 1401. Second valve; 15. Evaporator pipe; 1501. Cold recovery box; 502. 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 exchanger tube; 2601. Displacement box; 2602. Discharge pipe; 2603. Second cold air duct; 27. First cold air duct. Detailed Implementation

[0026] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0027] First implementation method:

[0028] Figures 1-5 An automatic refrigerant charging device for refrigeration equipment is shown, comprising a bracket 1, an upper retaining frame 2 fixedly connected to the top of the bracket 1, a lower retaining frame 3 slidably connected to the inner wall of the upper retaining frame 2, a can holder 4 fixedly connected to the bottom of the lower retaining frame 3, a refrigerant can 5 placed inside the can holder 4, a tension spring 6 fixedly connected between the bottom of the lower retaining frame 3 and the top of the upper retaining frame 2, a distance sensor 8 fixedly connected to the side wall of the bottom of the bracket 1, a reference plate 9 fixedly connected to the side wall of the can holder 4, the reference plate 9 being directly above the distance sensor 8, a main manifold 12 fixedly connected to one end of the refrigerant can 5, and a main manifold 12 fixedly connected to the side wall of the bracket 1. There is a gas tank 13, and a sealing plug 1302 is slidably connected to the inner wall of the gas tank 13. A temperature regulating pipe 14 and a return pipe 18 are fixedly connected to the bottom end of the gas tank 13. An intermediate pipe 19 is fixedly connected between the temperature regulating pipe 14 and one end of the main drain pipe 12. A filling pipe 16 is fixedly connected to one end of the intermediate pipe 19. A connector 1601 is fixedly connected to one end of the filling pipe 16. A first valve 1201, a second valve 1401, a third valve 1602, and a fourth valve 1801 are respectively installed at one end of the main drain pipe 12, the temperature regulating pipe 14, the filling pipe 16, and the return pipe 18. An evaporation pipe 15 is connected to the temperature regulating pipe 14.

[0029] Under the influence 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 amount of refrigerant charged 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 equipment, connect it to the refrigeration equipment with connector 1601. The weight of the refrigerant to be charged into the refrigeration equipment is y. The height of the refrigerant tank 5 increases by z after subtracting y from its weight.

[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 equipment in liquid form through the main drain pipe 12 and the charging pipe 16. When the height of the refrigerant tank 5 reaches 70% to 90%, close the third valve 1602 and the fourth valve 1801 to stop charging the refrigeration equipment with liquid refrigerant, 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 drain pipe 12 and the temperature control pipe 14. When the refrigerant passes through the evaporator pipe 15, it evaporates into gas and enters the interior of the gas tank 13 in liquid form, pushing the sealing plug 1302 to move upward. When the refrigerant tank 5 rises to a height of z, the first valve 1201 is closed and the fourth valve 1801, the third valve 1602 and the second valve 1401 are opened. At this time, the sealing plug 1302 moves downward, charging the gaseous refrigerant inside the gas tank 13 into the refrigeration equipment.

[0033] The above setup, through the cooperation of tension spring 6 and distance sensor 8, can automatically add refrigerant into the refrigeration equipment. When the refrigerant is about to be fully charged, it converts the liquid refrigerant into gaseous refrigerant for charging, which can empty the residual liquid refrigerant in the pipeline, greatly reducing the amount of residual refrigerant in the pipeline, improving the accuracy of refrigerant charging, and avoiding waste.

[0034] A cold collection box 1501 is fitted on the outside of the evaporator tube 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 of the cold collection box 1501 and the upper frame 2. A mixing pipe 23 is fixedly connected to the outer wall of the first cold air pipe 27. An electric valve 24 is fixedly connected to one end of the mixing pipe 23. A temperature sensor 25 is fixedly connected to the inner wall of the upper frame 2. The temperature sensor 25 and the electric valve 24 are electrically connected.

[0035] With the above settings, when the liquid refrigerant evaporates into gas through the evaporator tube 15, it releases a large amount of cold energy. At this time, starting the blower 1502 can transfer the cold energy to the interior of the upper frame 2 through the first cold air duct 27. When the cold energy flows inside the first cold air duct 27, the outside air can mix with the cold energy through the mixing tube 23. By controlling the opening and closing of the electric valve 24 through the temperature sensor 25, the air intake of the mixing tube 23 can be controlled, and the temperature inside the upper frame 2 can be adjusted to achieve the effect of temperature control, so that the temperature of the upper frame 2 remains constant. At this time, the tension spring 6 can more accurately drive the refrigerant tank 5 to move. The above settings can automatically calibrate the tension spring 6, further improving the charging accuracy of the refrigerant.

[0036] Second implementation method:

[0037] Figure 1 and Figures 3-6 An automatic refrigerant charging device for refrigeration equipment is shown. Unlike the first embodiment, a heat exchange tube 26 is also connected to the temperature regulating tube 14. A displacement box 2601 is sleeved on the outer wall of the heat exchange tube 26. A second cold air pipe 2603 is connected between the bottom end of the displacement box 2601 and the upper buckle frame 2. A discharge pipe 2602 is fixedly connected to the bottom end of the displacement box 2601.

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

[0039] After the refrigerant is fully charged, close the third valve 1602 and the first valve 1201, and open the second valve 1401 and the fourth valve 1801. This keeps the gaseous refrigerant remaining in the return pipe 18, the main pipe 12, and the temperature regulating pipe 14 at a low temperature. As the low-temperature gaseous refrigerant gradually returns to normal temperature, the pressure inside the return pipe 18, the temperature regulating pipe 14, and the charging pipe 16 increases.

[0040] A collection pipe 22 is fixedly connected to the top end of the intermediate pipe 19. A connecting pipe 20 connects the collection 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 collection pipe 22. A suction piston 10 is fixedly connected to the output end of the electric rod 11. The suction piston 10 is slidably and sealed to the inner wall of the collection pipe 22. The pressure sensor 7 is electrically connected to the electric rod 11.

[0041] With the above settings, if the pressure inside the return pipe 18, temperature regulating pipe 14, and charging pipe 16 decreases, it indicates a possible leak. The pressure received by the pressure sensor 7 will then decrease. At this time, the electric lever 11 will be activated to drive the suction piston 10 upward, which can draw the refrigerant inside the return pipe 18, temperature regulating pipe 14, and main drain pipe 12 into the collection pipe 22, preventing the refrigerant from leaking into the air. The above settings can perform a self-check on the sealing of the charging device and prevent leaks during refrigerant charging.

[0042] A counterweight 1301 is fixedly connected to the top of the sealing plug 1302. With the above arrangement, the counterweight 1301 can assist the sealing plug 1302 in discharging the gaseous refrigerant inside the gas tank 13. The main drain pipe 12 and the return pipe 18 are both made of flexible materials. With the above arrangement, the main drain pipe 12 and the return pipe 18 are prevented from affecting the lifting and lowering of the refrigerant tank 5.

[0043] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

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

2. The automatic refrigerant charging device for refrigeration equipment according to claim 1, characterized in that: A cold collection box (1501) is fitted on the outside of the evaporator tube (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 of the cold collection box (1501) and the upper frame (2). A mixing pipe (23) is fixedly connected to the outer wall of the first cold air pipe (27).

3. The automatic refrigerant charging device for refrigeration equipment according to claim 2, characterized in that: An electric valve (24) is fixedly connected to one end of the mixing tube (23), and a temperature sensor (25) is fixedly connected to the inner wall of the upper buckle frame (2). 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). The outer wall of the heat exchange tube (26) is fitted with a displacement box (2601). A second cold air pipe (2603) is connected between the bottom end of the displacement box (2601) and the upper buckle frame (2). A discharge pipe (2602) is fixedly connected to the bottom end of the displacement box (2601).

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

6. The automatic refrigerant charging device for refrigeration equipment according to claim 5, characterized in that: An electric rod (11) is fixedly connected to the top end of the collecting tube (22), and an air suction piston (10) is fixedly connected to the output end of the electric rod (11). The air suction piston (10) is 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: A counterweight (1301) is fixedly connected to the top of the sealing plug (1302).

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

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