A refrigerant filling device with vacuum leak detection function

Abstract

The present invention belongs to the technical field of refrigerant filling, and specifically relates to a refrigerant filling device with a vacuum leak detection function, which includes a displacement plate, a box, a controller, a liquid storage tank, a vacuum pump, a manifold assembly, a booster pump and a connecting pipe assembly, and the connecting pipe assembly is connected to a balancing assembly; the connecting pipe assembly includes a manifold head, and the manifold head is connected to the balancing assembly through a bellows. When the refrigeration system is evacuated, the present invention extracts the air and moisture inside the refrigeration system through a vacuum pump, and the sealing plate, the connecting ring and the bellows move synchronously toward the manifold head under the action of negative pressure, and the connecting ring drives the bellows to fold. When the reset spring is stretched to the limit, the bellows is completely folded, and the moisture inside the annular groove of the bellows is squeezed out of the annular groove and extracted through the vacuum pump. Since the bellows is in a completely folded state, the space of the annular groove is controlled to a very small range, and it is not easy for moisture to enter the annular groove when passing through the bellows, thereby avoiding the accumulation of moisture inside the annular groove.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigerant filling, and in particular relates to a refrigerant filling device with a vacuum leak detection function. Background Art

[0002] The refrigerant charging device is a device used to add or replace refrigerant in a refrigeration unit. The refrigerant charging device has the advantages of high automation, multi-functional integration, and automatic refrigerant replenishment.

[0003] Before adding refrigerant, you need to first determine the type of refrigerant to be added, and select the appropriate refrigerant based on the refrigeration system model and requirements; check the refrigeration system to ensure that the system is operating normally and there are no leaks; then evacuate the refrigeration unit, and then add the refrigerant through the pressure difference formed by the booster pump, the internal pressure of the refrigerant tank, and the internal pressure of the refrigeration unit.

[0004] Before using the refrigerant filling device, you need to insert the filling head of the filling device into the filling port of the refrigeration unit. In order to facilitate the connection between the filling head and the filling port of the refrigeration unit, the filling head needs to be connected to the plastic bellows. Then start the vacuum pump to extract the air and moisture inside the refrigeration system. In this process, the water extracted by the vacuum pump is easy to enter the annular groove of the bellows. It is difficult for the vacuum pump to completely extract the water inside the annular groove, which can easily cause moisture to accumulate inside the annular groove, resulting in the refrigerant being mixed with moisture. When filling the refrigerant, the refrigerant is also easy to enter the annular groove of the bellows, resulting in waste of refrigerant. Summary of the invention

[0005] The purpose of the present invention is to provide a refrigerant filling device with a vacuum leak detection function to solve the technical problems in the prior art in view of the shortcomings of the prior art.

[0006] The object of the present invention can be achieved by the following technical scheme: a refrigerant filling device with a vacuum leak detection function, comprising a displacement plate, a box body and a controller mounted thereon, a liquid storage tank and a vacuum pump are installed inside the box body, the liquid storage tank is connected to a booster pump through a manifold assembly, the booster pump and the vacuum pump are connected to a connecting pipe assembly, and the connecting pipe assembly is connected to a balancing assembly;

[0007] The connecting pipe assembly includes a manifold, which is connected to the balancing assembly through a bellows;

[0008] The balancing component includes a connecting tube and a connecting head three. One end of the bellows is fixedly connected to the manifold, and the other end of the bellows is slidably installed inside the connecting tube. A connecting ring is installed at one end of the bellows, and a horizontally movable sealing plate is installed inside the connecting ring. The connecting head three is connected to the refrigeration system through a valve.

[0009] As a further optimization or improvement of the present solution, a clamping ring is installed at one end of the bellows, one end of the clamping ring is attached to the inner wall of the connecting tube through a sealing ring, and the other end of the clamping ring is engaged with the connecting ring.

[0010] As a further optimization or improvement of the present solution, both ends of the connecting ring are connected to the connecting plates via connecting springs, and the connecting plates are further connected to the sealing plates via connecting rods.

[0011] As a further optimization or improvement of this solution, the balancing assembly also includes an air storage cylinder and an air bag located inside the connecting cylinder. The air storage cylinder is connected to the air bag, and an active rack is installed on the connecting ring. The active rack is connected to the piston through a steering gear and a steering rack, and the piston slides inside the air storage cylinder.

[0012] As a further optimization or improvement of this solution, a return spring is installed between the connecting ring and the air storage cylinder.

[0013] As a further optimization or improvement of the present solution, a connector 2 and a connector 1 are respectively provided on the manifold, the connector 2 is connected to the vacuum pump through a valve, and the connector 1 is connected to the booster pump through a valve.

[0014] As a further optimization or improvement of this solution, the manifold assembly includes an inlet filter, a pressure sensor, a safety valve, a one-way valve and a flow meter.

[0015] Beneficial effects of the present invention:

[0016] (1) When the refrigeration system is evacuated, the present invention uses a vacuum pump to extract the air and moisture inside the refrigeration system. Prior to this, the operation of the vacuum pump provides negative pressure to the manifold through the second connector. The sealing plate, the connecting ring and the bellows move synchronously toward the manifold under the action of the negative pressure. The connecting ring drives the bellows to fold. When the reset spring is stretched to its limit, the bellows is completely folded, and the moisture inside the annular groove of the bellows is squeezed out of the annular groove and extracted by the vacuum pump. Then, the negative pressure drives the sealing plate to move, so that the air and moisture inside the refrigeration system enter the manifold through the connecting ring and are extracted by the vacuum pump. In this process, since the bellows is in a completely folded state, the space of the annular groove is controlled to be extremely small, and it is not easy for moisture to enter the annular groove when passing through the bellows, thereby avoiding the accumulation of moisture inside the annular groove.

[0017] When the vacuum is completed, the refrigerant is transported to the inside of the manifold through the booster pump. The refrigerant pushes the sealing plate and the connecting ring to move in three directions toward the connecting head. At the same time, the connecting ring drives the bellows to extend and the reset spring is stretched. When the bellows is fully extended, the inner wall of the bellows is gently rippled and almost flat, avoiding the accumulation of refrigerant inside the bellows, reducing refrigerant waste and improving the utilization rate of the refrigerant.

[0018] (2) When the refrigerant in the present invention is transported to the inside of the manifold through the booster pump, the connecting ring and the active rack thereon are pushed by the pressure, and the active rack drives the piston to move in the opposite direction through the steering gear and the steering rack. At this time, the piston draws the air pressure inside the airbag to the inside of the air storage cylinder. At this time, the airbag gradually sinks, and the space in the airbag area increases relatively. When the refrigerant enters the airbag area through the connecting ring, the pressurized refrigerant will fill the sunken airbag, thereby buffering the refrigerant pressure and reducing the impact of the refrigerant on the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the connection structure of the connecting pipe assembly and the balancing assembly.

[0022] Figure 3 It is a schematic diagram of the internal structure of the connecting pipe assembly and the balancing assembly.

[0023] Figure 4 Schematic diagram of the bellows connection structure.

[0024] Figure 5 It is a cross-sectional view of the overall structure of the connecting pipe assembly and the balancing assembly.

[0025] Figure 6 It is an exploded view of the overall structure of the connecting pipe assembly and the balancing assembly.

[0026] Figure 7 for Figure 5 Schematic diagram of the A part structure.

[0027] Figure 8 for Figure 5 Schematic diagram of the structure of part B.

[0028] The following are marked in the figure: 1. displacement plate; 2. housing; 3. controller; 4. liquid storage tank; 5. manifold assembly; 6. booster pump; 7. vacuum pump; 8. connecting pipe assembly; 801. connector one; 802. connector two; 803. manifold; 804. bellows; 806. retaining ring; 9. balancing assembly; 901. connecting tube; 902. connector three; 903. air bag; 904. air storage cylinder; 905. connecting ring; 906. sealing plate; 907. active rack; 908. piston; 909. return spring; 910. connecting plate; 911. connecting spring; 912. connecting rod; 913. steering gear; 914. steering rack. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 8 A refrigerant filling device with a vacuum leak detection function comprises a displacement plate 1 and a box body 2 and a controller 3 mounted thereon, a liquid storage tank 4 and a vacuum pump 7 are installed inside the box body 2, the liquid storage tank 4 is connected to a booster pump 6 through a manifold assembly 5, the booster pump 6 and the vacuum pump 7 are connected to a connecting pipe assembly 8, and the connecting pipe assembly 8 is connected to a balancing assembly 9;

[0031] The connecting pipe assembly 8 includes a manifold 803, and the manifold 803 is connected to the balancing assembly 9 through a bellows 804;

[0032] The balancing assembly 9 includes a connecting tube 901 and a connector three 902. One end of the bellows 804 is fixedly connected to the manifold 803, and the other end of the bellows 804 is slidably installed inside the connecting tube 901. A connecting ring 905 is installed at one end of the bellows 804, and a horizontally movable sealing plate 906 is installed inside the connecting ring 905. The connector three 902 is connected to the refrigeration system through a valve.

[0033] Specifically, both ends of the connecting ring 905 are connected to the connecting plate 910 via connecting springs 911 , and the connecting plate 910 is connected to the sealing plate 906 via a connecting rod 912 .

[0034] Specifically, the manifold 803 is provided with a second connector 802 and a first connector 801 , respectively. The second connector 802 is connected to the vacuum pump 7 through a valve, and the first connector 801 is connected to the booster pump 6 through a valve.

[0035] It should be noted that when the present invention is in use, it is necessary to first evacuate the refrigeration system, connect the refrigeration system through the connector three 902, then close the valve on the connector one 801, open the valve on the connector two 802, turn on the vacuum pump 7, and extract the air and moisture inside the refrigeration system through the vacuum pump 7. Before this, the operation of the vacuum pump 7 will provide negative pressure to the manifold 803 through the connector two 802. When the negative pressure is generated, the sealing plate 906, the connecting ring 905 and the bellows 804 move synchronously toward the manifold 803 under the action of the negative pressure, the reset spring 909 is stretched, and the connecting ring 905 drives the bellows 804 to fold. When the reset spring 909 is stretched to the limit, the bellows 804 is completely folded, and the moisture inside the annular groove of the bellows 804 is squeezed out of the annular groove and extracted through the vacuum pump 7. See Figure 7Then, the negative pressure drives the sealing plate 906 to move, so that the sealing plate 906 is separated from the connecting ring 905. At this time, the air and moisture inside the refrigeration system enter the manifold 803 through the connecting ring 905 and are extracted by the vacuum pump 7. In this process, since the bellows 804 is in a completely folded state, the space of the annular groove is controlled to a very small range, and it is not easy for moisture to enter the annular groove when passing through the bellows 804, thereby avoiding the accumulation of moisture inside the annular groove;

[0036] When the vacuuming is completed, the valve on the second connector 802 is closed, the vacuum pump 7 is turned off, the valve on the first connector 801 is opened, the booster pump 6 is turned on, and the refrigerant is transported to the inside of the manifold 803 through the booster pump 6. The refrigerant pushes the sealing plate 906 and the connecting ring 905 to move toward the third connector 902. At the same time, the connecting ring 905 drives the bellows 804 to extend, and the reset spring 909 is stretched. When the bellows 804 is fully extended, the inner wall of the bellows 804 is gently undulated and almost flat, which avoids the refrigerant from accumulating inside the bellows 804, reduces the waste of refrigerant, and improves the utilization rate of the refrigerant. Then the refrigerant pushes the sealing plate 906 to move, so that the sealing plate 906 is separated from the connecting ring 905, and the refrigerant is injected into the refrigeration system through the connecting ring 905.

[0037] It should be noted that the vacuum degree, vacuum recovery pressure value, vacuum detection time, vacuum replenishment time, etc. can be directly set on the controller 3, and the vacuum degree setting, vacuum detection time setting, etc. can also be adjusted according to on-site requirements.

[0038] The present invention first evacuates the refrigeration system. Within the set time, if the vacuum degree is qualified, the vacuum pressure maintenance leakage detection is performed. If the vacuum degree is unqualified (the vacuum will rise again), the refrigeration system is re-evacuated. If the vacuum re-evacuation still fails to reach the set value, an alarm is issued and the process is stopped. If the vacuum degree is within the qualified range after the vacuum detection, the next step is performed.

[0039] See also Figure 7 A snap ring 806 is installed at one end of the bellows 804 , one end of the snap ring 806 is attached to the inner wall of the connecting tube 901 through a sealing ring, and the other end of the snap ring 806 is engaged with the connecting ring 905 .

[0040] It should be noted that the clamping ring 806 realizes the sealing between the bellows 804 and the connecting tube 901 through the sealing ring, so as to avoid leakage between the bellows 804 and the connecting tube 901 when the bellows 804 is loosened or tightened.

[0041] See also Figure 5-Figure 7The balancing assembly 9 also includes an air cylinder 904 and an air bag 903 located inside the connecting tube 901. The air cylinder 904 is connected to the air bag 903. An active rack 907 is installed on the connecting ring 905. The active rack 907 is connected to the piston 908 through a steering gear 913 and a steering rack 914, and the piston 908 is located inside the air cylinder 904 and slides.

[0042] Specifically, a return spring 909 is installed between the connecting ring 905 and the air storage cylinder 904 .

[0043] It should be noted that

[0044] It should be noted that, since the refrigerant needs to be pressurized by the booster pump 6 and transported into the refrigeration system, the refrigerant has a greater impact on the refrigeration pipeline. In order to stabilize the refrigerant pressure and reduce the impact of the refrigerant on the pipeline.

[0045] Before charging refrigerant into the refrigeration system of the present invention, it is necessary to close the valve on the second connector 802, turn off the vacuum pump 7, open the valve on the first connector 801, turn on the booster pump 6, and the refrigerant is transported to the inside of the manifold 803 through the booster pump 6. The refrigerant pushes the sealing plate 906 and the connecting ring 905 to move toward the direction of the third connector 902. At the same time, the active rack 907 on the connecting ring 905 moves, and the active rack 907 drives the piston 908 to move in the opposite direction through the steering gear 913 and the steering rack 914. At this time, the piston 908 draws the internal air pressure of the airbag 903 to the inside of the air storage cylinder 904. At this time, the airbag 903 gradually sinks, and the space at the part of the airbag 903 increases relatively. When the refrigerant enters through the connecting ring 905 When entering the airbag 903 area, the pressurized refrigerant fills the recessed airbag 903, thereby buffering the refrigerant pressure and reducing the impact of the refrigerant on the pipeline; when the refrigerant pressure entering the manifold 803 is reduced, the pressure generated by the refrigerant on the connecting ring 905 is reduced, so the return spring 909 rebounds to a certain extent, and the return spring 909 rebounds to drive the connecting ring 905 and the active rack 907 thereon to move, and the active rack 907 drives the piston 908 to move through the steering gear 913 and the steering rack 914, so that the piston 908 pushes the gas inside the air storage cylinder 904 into the airbag 903, so that the airbag 903 gradually expands, and the space at the airbag 903 is relatively small, so that the airbag 903 compresses the refrigerant to balance the pressure of the refrigerant.

[0046] See also Figure 1 The manifold assembly 5 includes an inlet filter, a pressure sensor, a safety valve, a check valve and a flow meter.

[0047] It should be noted that the inlet filter, pressure sensor, safety valve, one-way valve and flow meter inside the manifold assembly 5 are to ensure the safety and stability of the refrigerant operation in the liquid storage tank 4. The above components are all prior art and will not be described in detail in the present invention.

[0048] The implementation principle of the present invention is as follows: when the present invention is used, it is necessary to first evacuate the refrigeration system, connect the refrigeration system through the connector three 902, then close the valve on the connector one 801, open the valve on the connector two 802, turn on the vacuum pump 7, and extract the air and moisture inside the refrigeration system through the vacuum pump 7. Before this, the operation of the vacuum pump 7 will provide negative pressure to the manifold 803 through the connector two 802. When the negative pressure is generated, the sealing plate 906, the connecting ring 905 and the bellows 804 move synchronously toward the manifold 803 under the action of the negative pressure, the reset spring 909 is stretched, and the connecting ring 905 drives the bellows 804 to fold. When the reset spring 909 is stretched to the limit, the bellows 804 is completely folded, and the moisture inside the annular groove of the bellows 804 is squeezed out of the annular groove and extracted through the vacuum pump 7. See Figure 7 Then, the negative pressure drives the sealing plate 906 to move, so that the sealing plate 906 is separated from the connecting ring 905. At this time, the air and moisture inside the refrigeration system enter the manifold 803 through the connecting ring 905 and are extracted by the vacuum pump 7. In this process, since the bellows 804 is in a completely folded state, the space of the annular groove is controlled to a very small range, and it is not easy for moisture to enter the annular groove when passing through the bellows 804, thereby avoiding the accumulation of moisture inside the annular groove;

[0049] When the vacuuming is finished, the valve on the second connector 802 is closed, the vacuum pump 7 is turned off, the valve on the first connector 801 is opened, the booster pump 6 is turned on, and the refrigerant is transported to the inside of the manifold 803 through the booster pump 6. The refrigerant pushes the sealing plate 906 and the connecting ring 905 to move toward the direction of the third connector 902. At the same time, the connecting ring 905 drives the bellows 804 to stretch, and the return spring 909 is stretched. When the bellows 804 is fully stretched, the inner wall of the bellows 804 is gently undulated and almost flat, so as to avoid the refrigerant from accumulating inside the bellows 804, reduce the waste of refrigerant, and improve the utilization rate of the refrigerant. Then the refrigerant pushes the sealing plate 906 to move, so that the sealing plate 906 is separated from the connecting ring 905, and the refrigerant is injected into the refrigeration system through the connecting ring 905.

[0050] Specifically, when the refrigerant is transported to the inside of the manifold 803 through the booster pump 6, the connecting ring 905 and the active rack 907 thereon are pushed by the pressure, and the active rack 907 drives the piston 908 to move in the opposite direction through the steering gear 913 and the steering rack 914. At this time, the piston 908 draws the internal air pressure of the airbag 903 to the inside of the air storage cylinder 904. At this time, the airbag 903 gradually sinks, and the space at the airbag 903 part increases relatively. When the refrigerant enters the airbag 903 area through the connecting ring 905, the pressurized refrigerant fills the sunken airbag 903, thereby buffering the refrigerant pressure and reducing the refrigerant's impact on the pipeline. Impact; when the pressure of the refrigerant entering the manifold 803 decreases, the pressure generated by the refrigerant on the connecting ring 905 decreases, so the return spring 909 rebounds a certain distance, and the return spring 909 rebounds to drive the connecting ring 905 and the active rack 907 thereon to move, and the active rack 907 drives the piston 908 to move through the steering gear 913 and the steering rack 914, so that the piston 908 pushes the gas inside the gas storage cylinder 904 into the airbag 903, so that the airbag 903 gradually expands, and the space at the airbag 903 is relatively reduced, so that the airbag 903 compresses the refrigerant to balance the pressure of the refrigerant.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A refrigerant filling device with a vacuum leak detection function, characterized in that: It comprises a displacement plate (1) and a box (2) and a controller (3) mounted thereon, a liquid storage tank (4) and a vacuum pump (7) being installed inside the box (2), the liquid storage tank (4) being connected to a booster pump (6) via a manifold assembly (5), the booster pump (6) and the vacuum pump (7) being connected to a connecting pipe assembly (8), and the connecting pipe assembly (8) being connected to a balancing assembly (9); The connecting pipe assembly (8) comprises a manifold (803), and the manifold (803) is connected to the balancing assembly (9) via a bellows (804); The balancing assembly (9) comprises a connecting tube (901) and a third connector (902); one end of the bellows (804) is fixedly connected to the manifold (803); the other end of the bellows (804) is slidably mounted inside the connecting tube (901); a connecting ring (905) is mounted on one end of the bellows (804); a sealing plate (906) that can move horizontally is mounted inside the connecting ring (905); and the third connector (902) is connected to the refrigeration system via a valve; The balancing assembly (9) further comprises an air storage cylinder (904) and an air bag (903) located inside the connecting tube (901); the air storage cylinder (904) is connected to the air bag (903); an active rack (907) is installed on the connecting ring (905); the active rack (907) is connected to the piston (908) via a steering gear (913) and a steering rack (914); and the piston (908) is located inside the air storage cylinder (904) and slides.

2. A refrigerant charging device with a vacuum leak detection function according to claim 1, characterized in that: A clamping ring (806) is installed at one end of the bellows (804), one end of the clamping ring (806) is attached to the inner wall of the connecting tube (901) via a sealing ring, and the other end of the clamping ring (806) is clamped with the connecting ring (905).

3. A refrigerant charging device with a vacuum leak detection function according to claim 1, characterized in that: Both ends of the connecting ring (905) are connected to the connecting plate (910) via connecting springs (911), and the connecting plate (910) is further connected to the sealing plate (906) via a connecting rod (912).

4. A refrigerant charging device with a vacuum leak detection function according to claim 1, characterized in that: A return spring (909) is installed between the connecting ring (905) and the gas storage cylinder (904).

5. The refrigerant charging device with vacuum leak detection function according to claim 1, characterized in that: The manifold (803) is provided with a second connector (802) and a first connector (801), respectively; the second connector (802) is connected to a vacuum pump (7) via a valve, and the first connector (801) is connected to a booster pump (6) via a valve.

6. A refrigerant charging device with a vacuum leak detection function according to claim 1, characterized in that: The manifold assembly (5) comprises an inlet filter, a pressure sensor, a safety valve, a one-way valve and a flow meter.

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