Refrigerant filling device and working method

Abstract

The invention belongs to the technical field of automobile production, and discloses a refrigerant filling device and a working method. The device comprises a first cabinet body, a second cabinet body and a vacuum pump, a storage tank is installed in the first cabinet body, a flammable refrigerant is stored in the storage tank, a conveying component is installed in the second cabinet body, the storage tank communicates with the conveying component, the conveying component communicates with a filling pipe, the outer side of the filling pipe is wrapped with a vacuum pipe, and a gap cavity is defined between the filling pipe and the vacuum pipe; the tail end of the filling pipe is provided with a filling gun, the inner cavity of the first cabinet body, the inner cavity of the second cabinet body and the gap cavity are externally connected with an exhaust pipeline, the fan can exhaust gas in the exhaust pipeline to the outside, and the vacuum pump is communicated with the filling gun through the exhaust pipeline; the problem that in the prior art, leakage and explosion risks are likely to occur when flammable refrigerants are injected is solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile production, and in particular to a refrigerant filling device and a working method. Background Art

[0002] The traditional automotive refrigerant is R-1234YF, which is a relatively stable material. The alternative flammable refrigerant, whose Chinese name is tetrafluoropropylene, is favored by more and more vehicle manufacturers because of its low damage to the environment. However, according to the standards for chemical classification, warning labels and warning instructions, this product belongs to the category of flammable gas. If it leaks during the filling process, it may explode when it reaches a certain concentration in the air. During the filling process, the flammable refrigerant is directly added to the air-conditioning pipe in the car. In the process of connecting the filling gun with the air-conditioning pipe, there may be leakage due to poor connection, and the filling pipeline may be damaged, causing the flammable refrigerant to overflow, thereby increasing the risk of explosion. Summary of the invention

[0003] The purpose of the present invention is to provide a refrigerant filling device and a working method to solve the problem of leakage and explosion risks in the prior art when filling flammable refrigerants.

[0004] To achieve this object, the present invention adopts the following technical scheme: The present invention provides a refrigerant filling device, comprising a first cabinet, a second cabinet and a vacuum pump, a storage tank is installed in the first cabinet, and a flammable refrigerant is stored in the storage tank, a conveying component is installed in the second cabinet, the storage tank is connected to the conveying component, the conveying component is connected to a filling pipe, a vacuum tube is wrapped around the outside of the filling pipe, a gap cavity is formed between the filling pipe and the vacuum tube, a filling gun is installed at the end of the filling pipe, the first cabinet inner cavity, the second cabinet inner cavity and the gap cavity are connected to the outside of the exhaust pipe, the fan can discharge the gas in the exhaust pipe to the outside, and the vacuum pump is connected to the filling gun through an exhaust pipe.

[0005] Preferably, a liquid feed pump, a boost pump and an accumulator are installed in sequence in the conveying component, a section valve is installed between the liquid feed pump, the boost pump and the accumulator, the section valve is installed between the storage tank and the conveying component, and the section valve is installed between the conveying component and the filling pipe.

[0006] Preferably, a first sensor is installed in the first cabinet, and the first sensor can detect flammable refrigerant.

[0007] Preferably, a second sensor is installed in the second cabinet, and the second sensor can detect flammable refrigerant.

[0008] Preferably, the filling gun is inserted into the pipe mouth of the vehicle's air-conditioning duct, a ejector pin is installed in the air-conditioning duct, the ejector pin abuts against the pipe mouth of the air-conditioning duct, an abutment piece is formed in the filling gun, the abutment piece abuts against the ejector pin, a distance detection sensor is installed in the air-conditioning duct, and the distance detection sensor can detect the movement stroke of the ejector pin.

[0009] Preferably, a pressure sensor is installed between every two sectional valves.

[0010] Preferably, the accumulator is also installed with a first auxiliary pipeline, a second auxiliary pipeline and a third auxiliary pipeline, the first auxiliary pipeline is connected between the first cabinet and the liquid feeding pump, the second auxiliary pipeline is connected between the liquid feeding pump and the boosting pump, and the third auxiliary pipeline is connected to the filling pipe.

[0011] A working method of a refrigerant filling device, comprising the refrigerant filling device described above, further comprising the following steps:

[0012] S1, the filling gun is inserted into the air conditioning pipe on the vehicle, and the ejector pin inside the air conditioning pipe is in abutment with the filling gun abutment piece;

[0013] S2, after the distance detection sensor detects that the ejector pin has moved to the specified position, the vacuum pump evacuates the air conditioning pipe;

[0014] S3, vacuuming is completed, the storage tank releases the flammable refrigerant, and the filling gun fills the flammable refrigerant into the air conditioning pipe;

[0015] S4, the filling of the flammable refrigerant is completed, and the excess flammable refrigerant at the filling gun nozzle is discharged from the exhaust pipe;

[0016] S5, the filling gun is pulled out, the ejector pin rebounds, and the distance detection sensor detects that the ejector pin returns to the initial position, and the filling process ends.

[0017] Beneficial effect: By setting the first cabinet and the second cabinet, during the filling process of the filling gun, the flammable refrigerant gas in the storage tank and the flammable refrigerant gas in the conveying component can be prevented from diffusing to the outside. The air in the first cabinet and the second cabinet can be extracted to the outside through the exhaust pipe to avoid accumulation around the storage tank and the conveying component. At the same time, a vacuum tube is arranged on the outside of the filling pipe. When the filling pipe is damaged, the flammable refrigerant will enter the gap cavity and be discharged to the outside by the exhaust pipe, so as to avoid the flammable refrigerant concentration around the refrigerant filling device being too high and reduce the risk of explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a main body diagram of the refrigerant filling device of the present invention;

[0019] Figure 2It is a schematic diagram of the connection of the filling gun of the present invention.

[0020] In the figure: 1. first cabinet; 2. second cabinet; 3. vacuum pump; 4. storage tank; 5. filling gun; 6. exhaust pipe; 7. fan; 8. filling pipe; 9. vacuum tube; 10. liquid feeding pump; 11. booster pump; 12. accumulator; 13. section valve; 14. first sensor; 15. second sensor; 17. exhaust pipe; 18. ejector pin; 19. abutment; 20. air conditioning pipe; 21. first auxiliary pipeline; 22. second auxiliary pipeline; 23. third auxiliary pipeline. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0022] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0025] Under the existing technology, after the air-conditioning pipe is evacuated, flammable refrigerant is directly added to the air-conditioning pipe through the filling pipeline. If the filling pipeline or other pipelines for transporting flammable refrigerant are damaged or leak, the refrigerant filling device will have a high concentration of flammable refrigerant, which may easily cause an explosion and threaten the safety of the operator.

[0026] In order to solve the above problems, Figure 1 to Figure 2 As shown, the present invention provides a refrigerant filling device, including a first cabinet 1, a second cabinet 2 and a vacuum pump 3. A storage tank 4 is installed in the first cabinet 1, and a flammable refrigerant is stored in the storage tank 4. A conveying component is installed in the second cabinet 2, and the storage tank 4 is connected to the conveying component, and the conveying component is connected to a filling pipe 8. A vacuum tube 9 is wrapped around the outer side of the filling pipe 8, and a gap cavity is formed between the filling pipe 8 and the vacuum tube 9. A filling gun 5 is installed at the end of the filling pipe 8. The inner cavity of the first cabinet 1, the inner cavity of the second cabinet 2 and the gap cavity are connected to the outside of the exhaust pipe 6. A fan 7 is installed in the exhaust pipe 6, which can convey the air in the exhaust pipe 6 to the outside. The vacuum pump 3 is connected to the filling gun 5 through an exhaust pipe 17. A corrugated double tube can also be used instead of the filling pipe 8 and the vacuum tube 9. The vacuum pump 3 can be connected to the corrugated double tube to keep the interlayer in the corrugated double tube in a vacuum state at all times. The corrugated double tube is also called a double anti-leakage filling tube, which is composed of two layers of inner and outer pipelines. The inner layer of the pipeline is used for the flow of refrigerant medium and must have pressure resistance and corrosion resistance. The outer layer of the pipeline is a protective pipe and must have resistance to bending and stretching, corrosion, leakage, flame retardancy, and water resistance. A gap area is formed between the pipelines on both sides, and the two layers of pipelines are connected with a well-sealed threaded protective joint to ensure that the refrigerant gas leaked from the inner layer of the pipeline is retained in the gap area and can eventually be extracted by the fan 7.

[0027] Choosing lightweight materials can effectively reduce the weight of the hose. You can choose to use lightweight high-strength plastics or composite materials as the inner and outer materials of the hose to replace traditional metal or heavy rubber materials. By reducing the number of fabric reinforcement layers or adjusting the fabric weaving method, the weight of the hose can be reduced while maintaining sufficient strength and pressure resistance.

[0028] Placing the storage tank 4 in the first cabinet 1 can prevent the flammable refrigerant from leaking directly to the outside. At the same time, a first sensor 14 is placed in the first cabinet 1. The first sensor 14 can detect whether the flammable refrigerant is leaking in time, monitor the flammable refrigerant in the storage tank 4 in real time, and directly discharge the leaked flammable refrigerant to the outside through the exhaust duct 6 to avoid accumulation in the refrigerant filling device and reduce the risk of explosion. Similarly, a second sensor 15 is also installed in the second cabinet 2. The second sensor 15 can monitor whether the conveying component leaks. If a leak occurs, it can be discharged to the outside through the exhaust duct 6 in time; the first sensor 14 and the second sensor 15 can be connected to an alarm device to remind the staff. Similarly, if the filling pipe 8 leaks, the leaked flammable refrigerant can directly enter the gap cavity, and the gap cavity discharges air to the outside through the exhaust duct 6 to reduce the risk of explosion. At the same time, the exhaust duct 6 can be in a slightly negative pressure state in the first cabinet 1, the second cabinet 2 and the gap cavity, and the flammable refrigerant can be discharged once a leak occurs.

[0029] A liquid feed pump 10, a booster pump 11 and an accumulator 12 are sequentially installed in the conveying component. The flammable refrigerant is pressurized and liquefied by the booster pump 11 under the action of the liquid feed pump 10, and is finally sent to the accumulator 12, and then sent to the air conditioning pipe 20 through the accumulator 12. A segmentation valve 13 is installed between the liquid feed pump 10, the booster pump 11 and the accumulator 12, a segmentation valve 13 is installed between the storage tank 4 and the conveying component, and a segmentation valve 13 is installed between the conveying component and the filling pipe 8. The pipeline of the refrigerant filling device can be divided by the segmentation valve 13. If a leak occurs in one of the pipelines, the segmentation valves on both sides of the leak can be closed. Valve 13 is closed to prevent further leakage of flammable refrigerant. At the same time, by adding a pressure sensor between the segmented valves 13, the pipeline pressure at different positions can be monitored to monitor whether the flammable refrigerant is leaking. If leakage occurs, the pipeline pressure will be reduced, and then the segmented valves 13 on both sides will be closed through the pressure sensor to achieve automatic cut-off. At the same time, the fan 7 will increase its own speed and start the forced exhaust mode to quickly discharge the flammable refrigerant to the outside. At this time, the exhaust speed of the fan can reach more than 0.5m / s. When a pressure drop occurs in the segmented valve 13, the controller electrically connected to the segmented valve 13 will alarm.

[0030] The filling gun 5 is plugged into the pipe mouth of the air-conditioning pipe 20 of the vehicle. A ejector pin 18 is installed in the air-conditioning pipe 20, and the ejector pin 18 abuts against the pipe mouth of the air-conditioning pipe 20. An abutment member 19 is formed in the filling gun 5, and the abutment member 19 abuts against the ejector pin 18. A distance detection sensor is installed in the air-conditioning pipe 20, and the distance detection sensor can detect the movement stroke of the ejector pin 18. Only when the ejector pin 18 moves to the specified position can the sectional valve 13 be fully opened to fill the combustible refrigerant. When the abutment member 19 contacts the ejector pin 18, a detection signal is generated and sent to the distance detection sensor. The distance detection sensor starts to detect the distance moved by the ejector pin 18. After the filling is completed, the ejector pin 18 will automatically rebound and send an end signal to the distance detection sensor. If the distance detection sensor does not receive the signal, the ejector pin 18 is not closed normally, and the alarm connected to the distance detection sensor will sound an alarm.

[0031] The filling gun 5 is also provided with a clamping member. When the clamping member is normally connected to the interface in the air conditioning pipe 20, the abutment member 19 pushes the ejector pin 18 to move.

[0032] The accumulator 12 is also equipped with a first auxiliary pipeline 21, a second auxiliary pipeline 22 and a third auxiliary pipeline 23. The first auxiliary pipeline 21 is connected between the first cabinet 1 and the liquid feeding pump 10, the second auxiliary pipeline 22 is connected between the liquid feeding pump 10 and the booster pump 11, and the third auxiliary pipeline 23 is connected to the filling pipe 8. After the filling process is completed, the flammable refrigerant in the internal pipeline of the conveying member will enter the accumulator 12 along the first auxiliary pipeline 21, the second auxiliary pipeline 22 and the third auxiliary pipeline 23 to avoid staying in the pipeline for a long time.

[0033] The present invention also discloses a working method of a refrigerant filling device, comprising the following steps:

[0034] S1, the filling gun 5 is inserted into the air conditioning pipe 20 on the vehicle, and the ejector pin 18 inside the air conditioning pipe 20 abuts against the abutment member 19 of the filling gun 5;

[0035] S2, after the distance detection sensor detects that the ejector pin 18 has moved to the designated position, the vacuum pump 3 evacuates the air conditioning pipe 20;

[0036] S3, vacuuming is completed, the storage tank 4 releases the combustible refrigerant, and the filling gun 5 fills the combustible refrigerant into the air conditioning pipe 20;

[0037] S4, the filling of the flammable refrigerant is completed, and the excess flammable refrigerant at the filling gun 5 is discharged from the exhaust pipe 6;

[0038] S5, the filling gun 5 is pulled out, the ejector pin 18 rebounds, and the distance detection sensor detects that the ejector pin 18 returns to the initial position, and the filling process ends.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A refrigerant filling device, It is characterized in that The invention comprises a first cabinet (1), a second cabinet (2) and a vacuum pump (3); a storage tank (4) is installed in the first cabinet (1); a flammable refrigerant is stored in the storage tank (4); a conveying component is installed in the second cabinet (2); the storage tank (4) is connected to the conveying component; the conveying component is connected to a filling pipe (8); a vacuum tube (9) is wrapped around the outside of the filling pipe (8); a gap cavity is formed between the filling pipe (8) and the vacuum tube (9); a filling gun (5) is installed at the end of the filling pipe (8); an exhaust pipe (6) is connected to the inner cavity of the first cabinet (1), the inner cavity of the second cabinet (2) and the gap cavity; a fan (7) can discharge the gas in the exhaust pipe (6) to the outside; and the vacuum pump (3) is connected to the filling gun (5) through an exhaust pipe (17).

2. The refrigerant filling device according to claim 1, It is characterized in that A liquid feed pump (10), a booster pump (11) and an accumulator (12) are sequentially installed in the conveying component; a segmentation valve (13) is installed between each of the liquid feed pump (10), the booster pump (11) and the accumulator (12); the segmentation valve (13) is installed between the storage tank (4) and the conveying component; and the segmentation valve (13) is installed between the conveying component and the filling pipe (8).

3. The refrigerant filling device according to claim 2, It is characterized in that A first sensor (14) is installed in the first cabinet (1), and the first sensor (14) is capable of detecting flammable refrigerant.

4. The refrigerant filling device according to claim 3, It is characterized in that A second sensor (15) is installed in the second cabinet (2), and the second sensor (15) is capable of detecting flammable refrigerant.

5. The refrigerant filling device according to claim 4, It is characterized in that The filling gun (5) is plugged into the pipe mouth of the vehicle's air conditioning pipe (20); a ejector pin (18) is installed in the air conditioning pipe (20); the ejector pin (18) abuts against the pipe mouth of the air conditioning pipe (20); an abutment member (19) is formed in the filling gun (5); the abutment member (19) abuts against the ejector pin (18); a distance detection sensor is installed in the air conditioning pipe (20); the distance detection sensor can detect the movement stroke of the ejector pin (18).

6. The refrigerant filling device according to claim 2, It is characterized in that A pressure sensor is installed between every two of the segment valves (13).

7. The refrigerant filling device according to claim 2, It is characterized in that The accumulator (12) is also provided with a first auxiliary pipeline (21), a second auxiliary pipeline (22) and a third auxiliary pipeline (23); the first auxiliary pipeline (21) is connected between the first cabinet (1) and the liquid supply pump (10); the second auxiliary pipeline (22) is connected between the liquid supply pump (10) and the booster pump (11); and the third auxiliary pipeline (23) is connected to the filling pipe (8).

8. A working method of a refrigerant filling device, It is characterized in that The refrigerant filling device according to claim 5 further comprises the following steps: S1, the filling gun (5) is inserted into the air conditioning pipe (20) on the vehicle, and the ejector pin (18) inside the air conditioning pipe (20) is in abutment with the abutment member (19) of the filling gun (5); S2, after the distance detection sensor detects that the ejector pin (18) moves to the designated position, the vacuum pump (3) evacuates the air conditioning pipe (20); S3, vacuuming is completed, the storage tank (4) releases the flammable refrigerant, and the filling gun (5) fills the flammable refrigerant into the air conditioning pipe (20); S4, the filling of the flammable refrigerant is completed, and the excess flammable refrigerant at the mouth of the filling gun (5) is discharged from the exhaust pipe (6); S5, the filling gun (5) is pulled out, the ejector pin (18) rebounds, and the distance detection sensor detects that the ejector pin (18) returns to the initial position, and the filling process ends.

Images