Refrigerant recovery device

Abstract

The present invention provides a refrigerant recovery device, which belongs to the technical field of air conditioning maintenance, including an air storage tank arranged between a refrigerant recovery machine and a recovery tank; the air storage tank has a first flow channel and a second flow channel, the second flow channel connects the pipeline and the recovery tank; a piston plate is slidably arranged in the air storage tank, the piston plate has a first side surface and a second side surface arranged oppositely, the first side surface and the inner side surface of the air storage tank enclose an air storage cavity, and the first flow channel connects the pipeline and the air storage cavity; a reversing member is slidably arranged on the extension path of the first flow channel and the second flow channel; the reversing member has a first position for opening the first flow channel and closing the second flow channel, and also has a second position for closing the first flow channel and opening the second flow channel; a linkage mechanism is slidably arranged in the air storage tank; the linkage mechanism has a control part and a trigger part, the control part abuts against the reversing member, and the trigger part is located in the air storage tank and faces the second side surface. The refrigerant recovery device provided by the present invention can prevent the air in the pipeline from entering the recovery tank.

Description

Technical Field

[0001] The invention belongs to the technical field of air-conditioning maintenance, and more specifically, relates to a refrigerant recovery device. Background Art

[0002] As an important public transportation tool in modern cities, the air conditioning system of subways has a vital impact on the comfort of passengers. Refrigerants play a key role in the operation of subway air conditioning systems. During the repair, maintenance or refrigerant replacement of subway air conditioning, the refrigerant in the air conditioner needs to be recycled to achieve the recycling of refrigerants and reduce pollution to the environment.

[0003] During the refrigerant recovery process, if air is mixed into the recovery tank, on the one hand, it will affect the purity of the refrigerant and reduce its refrigeration effect; on the other hand, when the refrigerant is subsequently circulated, the air may form air blockage in the system and affect the normal operation of the air-conditioning system. Therefore, it is necessary to discharge the air in the pipe connecting the air-conditioning unit and the recovery tank before discharging the refrigerant into the recovery tank.

[0004] However, the current traditional refrigerant recovery machine lacks a design specifically for exhausting air in the pipeline, so when using the refrigerant recovery machine, the staff needs to first open the solenoid valve at the air conditioning unit to allow the refrigerant to flow into the pipeline and enter the refrigerant recovery machine along the pipeline, and then continue to flow along the pipeline to the recovery tank under the action of the refrigerant recovery machine. In the process, the staff needs to loosen the nozzle at the connection between the pipeline and the recovery tank until they see the refrigerant in a gas-liquid mixed state sprayed out from the nozzle, proving that the air in the pipeline has been pushed out by the refrigerant, and then connect the nozzle and the recovery tank to allow the refrigerant to enter the recovery tank. The whole operation process has certain inconveniences. Summary of the invention

[0005] The object of the present invention is to provide a refrigerant recovery device, aiming to prevent air in a pipeline from entering a recovery tank.

[0006] To achieve the above object, the technical solution adopted by the present invention is: to provide a refrigerant recovery device, including an air conditioning unit, a refrigerant recovery machine and a recovery tank connected in sequence through a pipeline, and also including:

[0007] An air storage tank is arranged between the refrigerant recovery machine and the recovery tank and is located at the end of the pipeline; the air storage tank has a first flow channel and a second flow channel, and the second flow channel connects the pipeline and the recovery tank;

[0008] A piston plate is slidably disposed in the gas storage tank, the piston plate having a first side surface and a second side surface that are disposed opposite to each other, the first side surface and the inner side surface of the gas storage tank enclose an air storage cavity, and the first flow channel connects the pipeline with the air storage cavity;

[0009] a switching member, slidably disposed on an extension path of the first flow channel and the second flow channel; the switching member has a first position for opening the first flow channel and closing the second flow channel, and also has a second position for closing the first flow channel and opening the second flow channel; and

[0010] A linkage mechanism is slidably disposed in the gas storage tank; the linkage mechanism comprises a control part and a trigger part, the control part abuts against the reversing member, and the trigger part is located in the gas storage tank and faces the second side surface;

[0011] Wherein, when the reversing member is in the first position, the air in the pipeline enters the air storage chamber through the first flow channel and pushes the piston plate to move; when the piston plate moves to the second side and abuts against the trigger part, the piston plate pushes the linkage mechanism to move, so that the control part controls the reversing member to move from the first position to the second position.

[0012] In a possible implementation, the reversing member includes a first valve core and a second valve core, and the first valve core and the second valve core are both slidably disposed on the gas storage tank and are both in contact with the control unit;

[0013] Wherein, when in the first position, the first valve core avoids the first flow channel, and the second valve core closes the second flow channel; when in the second position, the first valve core closes the first flow channel, and the second valve core avoids the second flow channel.

[0014] In a possible implementation, a first avoidance hole is provided on the first valve core, and when the first avoidance hole is connected to the first flow channel, the first flow channel is opened, and when the first avoidance hole is misaligned with the first flow channel, the first flow channel is closed;

[0015] The second valve core is provided with a second avoidance hole. When the second avoidance hole is connected with the second flow channel, the second flow channel is opened. When the second avoidance hole is misaligned with the second flow channel, the second flow channel is closed.

[0016] In a possible implementation, the control unit includes:

[0017] A positioning slider is slidably arranged on the gas storage tank along the moving direction of the piston plate, and a displacement groove suitable for the reversing member to extend into is opened on the outer circumference; when the reversing member abuts against the outer circumference of the positioning slider, the reversing member is in the first position; when the reversing member extends into the displacement groove, the reversing member is in the second position;

[0018] The action component is connected to the gas storage tank and corresponds to the position of the switching member, and is used to push the switching member to move toward the direction close to the positioning slider.

[0019] In a possible implementation, the trigger unit includes:

[0020] An adjusting rod is slidably disposed on the gas storage tank along the moving direction of the piston plate, with one end extending toward the second side surface and the other end extending out of the gas storage tank, and the adjusting rod is connected to the positioning slider through a connecting portion;

[0021] A trigger plate, fixedly disposed on one end of the adjusting rod facing the second side surface;

[0022] Wherein, when the position of the trigger plate changes, the maximum volume of the air storage cavity changes.

[0023] In a possible implementation, the connecting portion includes:

[0024] A connecting rod, one end of which is fixedly arranged on the positioning slider, and the other end of which extends toward the trigger plate and passes through the gas storage tank, the piston plate and the trigger plate in sequence;

[0025] A clamping plate, rotatably disposed on an end of the connecting rod away from the positioning slider;

[0026] Wherein, the adjusting rod is provided with a plurality of slots evenly distributed along the axial direction, and the clamping plate is suitable for clamping with any of the slots.

[0027] In a possible implementation, the outer peripheral surface of the positioning slide block is provided with a control inclined surface, and the control inclined surface is located in the displacement groove;

[0028] When the switching member extends into the displacement groove, the positioning slider is rotated, and the control slope can abut against the switching member and push the switching member to move, so that the first flow channel is always in a closed state and the opening of the second flow channel changes.

[0029] In a possible implementation, a through hole for airflow to pass through is provided on the positioning slider along the moving direction of the positioning slider;

[0030] When the positioning slider moves, the airflow in front of the moving path of the positioning slider passes through the via hole and moves to the rear of the positioning slider.

[0031] In a possible implementation, the action component includes:

[0032] An operating ring is rotatably disposed on the gas storage tank and is disposed around the reversing member;

[0033] A fixed magnet, fixedly arranged on the operating ring;

[0034] A moving magnet, fixedly arranged on the commutating member;

[0035] Among them, the opposite ends of the fixed magnet and the moving magnet are repelling ends. When the operating ring rotates to the position where the fixed magnet corresponds to the moving magnet, the fixed magnet pushes the moving magnet to move toward the positioning slider, so that the commutator can move from the first position to the second position.

[0036] In a possible implementation, an iron block is fixedly disposed on the operating ring;

[0037] When the operating ring rotates until the positions of the iron block and the moving magnet correspond, the iron block absorbs the moving magnet and moves in a direction away from the positioning slider, so that the switching member can move from the second position to the first position.

[0038] Compared with the prior art, the refrigerant recovery device provided by the present invention has the following beneficial effects: when the refrigerant recovery work starts, the refrigerant recovery machine starts, the refrigerant in the air conditioning unit flows into the pipeline, the air in the pipeline is pushed out by the refrigerant, and flows into the air storage chamber through the first flow channel. As the air continues to flow in, the volume of the air storage chamber gradually increases, and the air pushes the piston plate to move in the air storage tank. In this process, the reversing member is always in the first position, so that the air can only enter the air storage chamber and not the recovery tank, thereby realizing the discharge and collection of the air in the pipeline.

[0039] When the piston plate moves to abut against the trigger part, it indicates that the air in the pipeline has been basically exhausted, and the refrigerant begins to enter the air storage chamber through the first flow channel. As the refrigerant flows in, the piston plate continues to move and pushes the linkage mechanism to move, so that the control unit pushes the reversing member from the first position to the second position. At this time, the refrigerant no longer enters the air storage chamber, but flows into the recovery tank through the second flow channel, thereby realizing the recovery of the refrigerant, ensuring that only the refrigerant enters the recovery tank, and avoiding air from mixing into the recovery tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic diagram of a refrigerant recovery machine provided by an embodiment of the present invention being connected to an air conditioning component and a recovery tank through a pipeline;

[0042] Figure 2 A cross-sectional view of the gas storage tank when the piston plate provided by the embodiment of the present invention abuts against the triggering part;

[0043] Figure 3 A cross-sectional view of the gas storage tank when the volume of the gas storage cavity is zero provided in an embodiment of the present invention;

[0044] Figure 4 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0045] Figure 5 for Figure 3 A schematic diagram of the enlarged structure of part B;

[0046] Figure 6 A front view of a gas storage tank provided by an embodiment of the present invention;

[0047] Figure 7 for Figure 6 Section view of the middle AA plane.

[0048] In the figure: 11, pipeline; 12, air conditioning unit; 13, recovery tank; 2, refrigerant recovery machine; 3, air storage tank; 31, first flow channel; 32, second flow channel; 33, air storage chamber; 4, piston plate; 51, first valve core; 511, first avoidance hole; 52, second valve core; 521, second avoidance hole; 61, positioning slider; 611, shifting groove; 612, control slope; 613, through hole; 614, rotating handle; 62, adjusting rod; 621, card slot; 63, trigger plate; 64, connecting rod; 65, card plate; 66, operating ring; 67, fixed magnet; 68, moving magnet; 69, iron block. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] See also Figure 1 Now, a refrigerant recovery device provided by the present invention is described. A refrigerant recovery device includes an air conditioning unit 12, a refrigerant recovery machine 2 and a recovery tank 13 which are sequentially connected through a pipeline 11.

[0051] See also Figure 2 , Figure 3 , Figure 4 and Figure 5The refrigerant recovery device further includes an air storage tank 3, a piston plate 4, a reversing member and a linkage mechanism. The air storage tank 3 is arranged between the refrigerant recovery machine 2 and the recovery tank 13, and is located at the end of the pipeline 11. The air storage tank 3 has a first flow channel 31 and a second flow channel 32. The second flow channel 32 connects the pipeline 11 and the recovery tank 13.

[0052] See also Figure 2 and Figure 3 The piston plate 4 is slidably disposed in the gas storage tank 3 along the axial direction of the gas storage tank 3. The piston plate 4 has a first side surface and a second side surface that are oppositely disposed. The first side surface and the inner side surface of the gas storage tank 3 form a closed gas storage cavity 33 with a variable volume. The first flow channel 31 connects the pipeline 11 with the gas storage cavity 33.

[0053] The reversing member is provided on the gas storage tank 3 for radial sliding of the gas storage tank 3, and is provided on the extension path of the first flow channel 31 and the second flow channel 32. It should be understood that a sealing ring is fixedly provided on the outer edge of the piston plate 4, so as to ensure that the sealing of the gas storage chamber 33 is not damaged during the movement of the piston plate 4. The reversing member has a first position and a second position. In the first position, the reversing member opens the first flow channel 31 and closes the second flow channel 32. In the second position, the reversing member closes the first flow channel 31 and opens the second flow channel 32. The linkage mechanism is provided on the gas storage tank 3 for axial sliding of the gas storage tank 3. The linkage mechanism has a control part and a trigger part. The control part abuts against the reversing member, and the trigger part is located in the gas storage tank 3 and faces the second side.

[0054] When the reversing member is in the first position, the air in the pipeline 11 enters the air storage chamber 33 through the first flow channel 31 and pushes the piston plate 4 to move. When the piston plate 4 moves to the second side and abuts against the trigger part, the piston plate 4 pushes the linkage mechanism to move, so that the control part controls the reversing member to move from the first position to the second position.

[0055] The initial position and preset position of the piston plate 4 are now defined. The initial position refers to the position of the piston plate 4 when the piston plate 4 abuts against the inner bottom wall of the gas storage tank 3 and the volume of the gas storage chamber 33 is zero. The preset position refers to the position when the second side of the piston plate 4 abuts against the trigger portion. At the preset position, the volume of the gas storage chamber 33 is similar to the volume of the entire pipeline 11 lumen. Since the pipelines 11 used in refrigerant recovery are all standard-sized pipelines 11, the staff can calculate the volume of the entire pipeline 11 lumen based on the length of the pipeline 11 used, thereby obtaining the amount of air present in the pipeline 11.

[0056] At the beginning of the refrigerant recovery work, the refrigerant recovery machine 2 is started, and the refrigerant in the air conditioning unit 12 flows into the pipeline 11. The air in the pipeline 11 is pushed out by the refrigerant and flows into the air storage chamber 33 through the first flow channel 31. As the air continues to flow in, the volume of the air storage chamber 33 gradually increases, and the air pushes the piston plate 4 to move to the preset position. In this process, the reversing member is always in the first position, so that the first flow channel 31 is opened and the second flow channel 32 is closed. The air can only enter the air storage chamber 33 through the first flow channel 31 and will not enter the recovery tank 13, so that the air in the pipeline 11 is collected in the air storage chamber 33 alone, realizing the automatic separation of air and refrigerant, avoiding the interference of air on the refrigerant purity and the recovery process, ensuring that the recovered refrigerant has a higher purity, and improving the quality of refrigerant recovery.

[0057] When the piston plate 4 moves to the preset position, it indicates that the air in the pipeline 11 has been basically exhausted, and the refrigerant in the air conditioning unit 12 begins to enter the air storage chamber 33. As the refrigerant flows in, the piston plate 4 continues to move and makes the second side contact with the trigger part of the linkage mechanism, so that the control part of the linkage mechanism pushes the reversing member to move from the first position to the second position, that is, closes the first flow channel 31 and opens the second flow channel 32, so that the refrigerant flows into the recovery tank 13 through the second flow channel 32. During the entire operation process, the refrigerant will not leak into the external environment, reducing the waste of refrigerant and reducing damage to the environment. At the same time, the staff only needs to start the refrigerant recovery machine 2, and the device will automatically complete the separation and recovery switching process of air and refrigerant, without the need for complex manual intervention operations, which improves work efficiency, reduces the requirements for staff skill proficiency, and reduces safety hazards caused by human operational errors.

[0058] In some embodiments, see Figure 4 and Figure 5 The reversing member includes a first valve core 51 and a second valve core 52, both of which are slidably disposed on the gas storage tank 3 and abut against the control unit. In the first position, the first valve core 51 avoids the first flow channel 31 and the second valve core 52 closes the second flow channel 32. In the second position, the first valve core 51 closes the first flow channel 31 and the second valve core 52 avoids the second flow channel 32.

[0059] Specifically, the first valve core 51 is provided with a first avoidance hole 511. When the first avoidance hole 511 is connected to the first flow channel 31, the first flow channel 31 is opened. When the first avoidance hole 511 is misaligned with the first flow channel 31, the first flow channel 31 is closed. The second valve core 52 is provided with a second avoidance hole 521. When the second avoidance hole 521 is connected to the second flow channel 32, the second flow channel 32 is opened. When the second avoidance hole 521 is misaligned with the second flow channel 32, the second flow channel 32 is closed.

[0060] The first valve core 51 and the second valve core 52 independently control the first flow channel 31 and the second flow channel 32 respectively. The first avoidance hole 511 of the first valve core 51 is connected with the first flow channel 31, so that the air can flow smoothly into the air storage chamber 33, while the second avoidance hole 521 of the second valve core 52 is misaligned with the second flow channel 32 to prevent the air from entering the recovery tank 13. When the piston plate 4 reaches the preset position and the refrigerant enters the air storage chamber 33, the first valve core 51 and the second valve core 52 act simultaneously under the control of the linkage mechanism, so that the first valve core 51 closes the first flow channel 31 and the second valve core 52 opens the second flow channel 32, so as to realize the circulation of the refrigerant to the recovery tank 13.

[0061] In some embodiments, see Figure 4 and Figure 5 The control part includes a positioning slider and an action component. The positioning slider 61 is slidably arranged on the gas storage tank 3 along the moving direction of the piston plate 4, and a displacement groove 611 suitable for the reversing member to extend into is opened on the outer peripheral surface. When the reversing member is against the outer peripheral surface of the positioning slider 61, the reversing member is in the first position. When the reversing member extends into the displacement groove 611, the reversing member is in the second position. The action component is connected to the gas storage tank 3 and corresponds to the position of the reversing member, and is used to push the reversing member to move in the direction close to the positioning slider 61.

[0062] It should be noted that the positioning slider 61 is a cylindrical structure, and the positioning slider 61 and the gas storage tank 3 are coaxially arranged. A cylindrical slide groove for the positioning slider 61 to move is provided on the gas storage tank 3. The displacement groove 611 is provided at the lower end of the positioning slider 61, and is provided in an annular shape around the circumference of the positioning slider 61. The first valve core 51 and the second valve core 52 are respectively provided on both sides of the positioning slider 61.

[0063] When the piston plate 4 is in the initial position, the first valve core 51 and the second valve core 52 respectively abut against the two sides of the circumferential surface of the positioning slider 61, so that the first valve core 51 and the second valve core 52 are in the first position. When it is necessary to switch to the refrigerant recovery state, the positioning slider 61 moves, and the action component pushes the first valve core 51 and the second valve core 52, so that the first valve core 51 and the second valve core 52 are both extended into the displacement groove 611, thereby reaching the second position, and realizing the refrigerant flowing into the recovery tank 13.

[0064] In some embodiments, see Figure 2 and Figure 3 The triggering part includes an adjusting rod 62 and a triggering plate 63. The adjusting rod 62 is slidably arranged on the gas storage tank 3 along the moving direction of the piston plate 4, and one end of the adjusting rod 62 extends toward the second side surface and the other end extends out of the gas storage tank 3. The adjusting rod 62 is connected to the positioning slider 61 through a connecting part. The triggering plate 63 is fixedly arranged at one end of the adjusting rod 62 facing the second side surface. When the position of the triggering plate 63 changes, the maximum volume of the gas storage chamber 33 changes.

[0065] It should be noted that the adjusting rod 62 is provided with a scale along the axial direction, which facilitates the staff to adjust the position of the trigger plate 63. A sleeve suitable for the sliding of the adjusting rod 62 is fixedly provided on the gas storage tank 3 to ensure the stability of the adjusting rod 62 when moving. At the same time, the number of the adjusting rods 62 is two, and they are symmetrically arranged on both sides of the connecting part.

[0066] The position of the trigger plate 63 can be adjusted by the adjusting rod 62, and the position of the trigger plate 63 determines the preset position of the piston plate 4. When the piston plate 4 moves to abut against the trigger plate 63, the trigger plate 63 can be driven to move together, and the trigger plate 63 drives the adjusting rod 62, the adjusting rod 62 drives the connecting part, and the connecting part drives the positioning slider 61. The movement of the positioning slider 61 can realize the control of the opening and closing of the first flow channel 31 and the second flow channel 32.

[0067] By changing the position of the trigger plate 63, the movement range of the piston plate 4 can be limited, thereby limiting the maximum volume of the air storage chamber 33 and changing the amount of air that can be collected by the air storage chamber 33. When facing pipelines 11 of different lengths, the amount of air in the pipeline 11 will be different. By adjusting the adjustment rod 62, the maximum volume of the air storage chamber 33 can be set to ensure that the air can be fully discharged without affecting the recovery of the refrigerant, thereby improving the adaptability of the recovery device to different pipelines 11.

[0068] In addition, after the refrigerant recovery is completed, when the air in the air storage chamber 33 needs to be discharged, the connection between the connecting part and the adjusting rod 62 can be released, and then the piston plate 4 can be driven to move by pushing the adjusting rod 62 toward the air storage tank 3, so that the piston plate 4 can completely discharge the air and refrigerant in the air storage chamber 33.

[0069] In some embodiments, see Figure 2 , Figure 3 and Figure 6 The connecting part includes a connecting rod 64 and a clamping plate 65. One end of the connecting rod 64 is fixed on the positioning slider 61, and the other end extends toward the trigger plate 63 and passes through the gas storage tank 3, the piston plate 4 and the trigger plate 63 in sequence. The clamping plate 65 is rotatably arranged at one end of the connecting rod 64 away from the positioning slider 61. A plurality of clamping grooves 621 are evenly distributed along the axial direction on the adjusting rod 62, and the clamping plate 65 is suitable for clamping with any clamping groove 621.

[0070] It should be noted that a sealing ring is fixed to the side of the piston plate 4 that is in contact with the connecting rod 64 , so that the sealing of the air storage cavity 33 will not be damaged when the piston plate 4 moves.

[0071] When the maximum volume of the air storage chamber 33 needs to be changed, the staff only needs to rotate the card plate 65 to disengage it from the current card slot 621, then slide the adjustment rod 62 to a suitable position, and then insert the card plate 65 into the new card slot 621. The operation is convenient and quick.

[0072] In some embodiments, see Figure 7 The outer peripheral surface of the positioning slider 61 has a control slope 612, and the control slope 612 is located in the displacement groove 611. When the switching member extends into the displacement groove 611, the positioning slider 61 is rotated around the axis of the gas storage tank 3, and the control slope 612 can abut against the switching member and push the switching member to move, so that the first flow channel 31 is always in a closed state and the opening of the second flow channel 32 changes.

[0073] When the positioning slider 61 is rotated around the axis of the gas storage tank 3, the control slope 612 can abut against the second valve core 52 and push the second valve core 52 to move, thereby changing the opening of the second flow channel 32. At this time, the control slope 612 does not contact the first valve core 51, ensuring the stability of the position of the first valve core 51, so that the first flow channel 31 is always in a closed state.

[0074] During the refrigerant recovery process, it is sometimes necessary to adjust the speed at which the refrigerant flows into the recovery tank 13 according to factors such as the capacity of the recovery tank 13 and the flow rate of the refrigerant. At this time, the opening of the second flow channel 32 can be changed within a certain range by rotating the positioning slider 61 to control the speed at which the refrigerant flows into the recovery tank 13. When the recovery tank 13 is close to full capacity, the opening of the second flow channel 32 can be appropriately reduced to reduce the refrigerant inflow speed and prevent refrigerant overflow. In the early stage of recovery, the opening can be appropriately increased to improve the recovery efficiency, thereby improving the flexibility and controllability of the recovery device.

[0075] In some embodiments, see Figure 4 , Figure 5 and Figure 7 The positioning slider 61 is provided with a through hole 613 for airflow to pass through along the moving direction of the positioning slider 61. When the positioning slider 61 moves, the airflow in front of the moving path of the positioning slider 61 passes through the through hole 613 and moves to the rear of the positioning slider 61. When the positioning slider 61 moves, the airflow in front of its moving path can pass through the through hole 613 and move to the rear, making the positioning slider 61 move more smoothly.

[0076] In some embodiments, see Figure 4 , Figure 5 and Figure 7The action assembly includes an operating ring 66, a fixed magnet 67 and a moving magnet 68. The operating ring 66 is rotatably set on the air storage tank 3 and is set around the commutator. The fixed magnet 67 is fixedly set on the operating ring 66. The moving magnet 68 is fixedly set on the commutator. The opposite ends of the fixed magnet 67 and the moving magnet 68 are repelling ends. When the operating ring 66 rotates to the position where the fixed magnet 67 corresponds to the moving magnet 68, the fixed magnet 67 pushes the moving magnet 68 to move in the direction close to the positioning slider 61, so that the commutator can move from the first position to the second position.

[0077] Specifically, there are two moving magnets 68 , which are respectively fixedly disposed at one end of the first valve core 51 and the second valve core 52 away from the positioning slider 61 . There are two fixed magnets 67 , which are respectively disposed at both sides of the operating ring 66 .

[0078] It should be noted that there is a certain rotation damping between the operating ring 66 and the gas storage tank 3, so that when the staff does not actively rotate the operating ring 66, the operating ring 66 itself can maintain a stable position.

[0079] When the operating ring 66 is rotated to make the fixed magnet 67 and the moving magnet 68 correspond in position, since the opposite ends of the fixed magnet 67 and the moving magnet 68 are repulsive ends, the fixed magnet 67 can exert a repulsive force on the moving magnet 68, thereby causing the first valve core 51 and the second valve core 52 to move and abut against the positioning slider 61. When the positioning slider 61 moves, the first valve core 51 and the second valve core 52 can continue to move under the action of the magnetic force and extend into the shifting groove 611.

[0080] In some embodiments, see Figure 7 An iron block 69 is fixedly disposed on the operating ring 66. When the operating ring 66 rotates to a position where the iron block 69 corresponds to the moving magnet 68, the iron block 69 attracts the moving magnet 68 and moves in a direction away from the positioning slider 61, so that the switching member can move from the second position to the first position.

[0081] When the refrigerant recovery is completed and the reversing member needs to be reset, the staff only needs to rotate the operating ring 66 until the position of the iron block 69 and the moving magnet 68 corresponds, and the adsorption force between the iron block 69 and the moving magnet 68 can be used to realize the movement of the reversing member, so that the first valve core 51 and the second valve core 52 move away from the positioning slider 61, and the reversing member moves from the second position to the first position.

[0082] In some embodiments, see Figure 4 and Figure 5 A rotating handle 614 is fixedly arranged on the positioning slide block 61, and the rotating handle 614 is located outside the gas storage tank 3. The setting of the rotating handle 614 facilitates the staff to operate and control the positioning slide block 61.

[0083] In summary, the refrigerant recovery device provided by the present invention realizes the automatic control of air discharge and refrigerant recovery through the coordinated work of the air storage tank 3, the piston plate 4, the reversing member and the linkage mechanism compared with the prior art. The staff only needs to start the refrigerant recovery machine 2, and the device will automatically complete the separation and recovery switching process of air and refrigerant without complicated manual intervention operations.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 present invention.

Claims

1. A refrigerant recovery device, comprising an air conditioning unit (12), a refrigerant recovery machine (2) and a recovery tank (13) which are sequentially connected via a pipeline (11), characterized in that: Also includes: An air storage tank (3) is arranged between the refrigerant recovery machine (2) and the recovery tank (13), and is located at the end of the pipeline (11); the air storage tank (3) has a first flow channel (31) and a second flow channel (32), and the second flow channel (32) connects the pipeline (11) and the recovery tank (13); A piston plate (4) is slidably disposed in the gas storage tank (3), the piston plate (4) having a first side surface and a second side surface disposed opposite to each other, the first side surface and the inner side surface of the gas storage tank (3) enclosing a gas storage cavity (33), and the first flow channel (31) connecting the pipeline (11) and the gas storage cavity (33); a reversing member, slidably disposed on an extension path of the first flow channel (31) and the second flow channel (32); the reversing member has a first position for opening the first flow channel (31) and closing the second flow channel (32), and also has a second position for closing the first flow channel (31) and opening the second flow channel (32); and a linkage mechanism, slidably disposed in the gas storage tank (3); the linkage mechanism comprises a control portion and a trigger portion, the control portion abuts against the reversing member, and the trigger portion is located in the gas storage tank (3) and faces the second side surface; Wherein, when the reversing member is in the first position, the air in the pipeline (11) enters the air storage chamber (33) through the first flow channel (31) and pushes the piston plate (4) to move; when the piston plate (4) moves to the second side surface and abuts against the triggering portion, the piston plate (4) pushes the linkage mechanism to move, so that the control unit controls the reversing member to move from the first position to the second position.

2. A refrigerant recovery device according to claim 1, characterized in that: The reversing member comprises a first valve core (51) and a second valve core (52), wherein the first valve core (51) and the second valve core (52) are both slidably disposed on the gas storage tank (3) and are both in contact with the control unit; Wherein, when in the first position, the first valve core (51) avoids the first flow channel (31), and the second valve core (52) closes the second flow channel (32); when in the second position, the first valve core (51) closes the first flow channel (31), and the second valve core (52) avoids the second flow channel (32).

3. A refrigerant recovery device according to claim 2, characterized in that: The first valve core (51) is provided with a first avoidance hole (511); when the first avoidance hole (511) is in communication with the first flow channel (31), the first flow channel (31) is opened; when the first avoidance hole (511) is misaligned with the first flow channel (31), the first flow channel (31) is closed; The second valve core (52) is provided with a second avoidance hole (521); when the second avoidance hole (521) is in communication with the second flow channel (32), the second flow channel (32) is opened; when the second avoidance hole (521) is misaligned with the second flow channel (32), the second flow channel (32) is closed.

4. A refrigerant recovery device according to claim 1, characterized in that: The control unit includes: A positioning slider (61) is slidably arranged on the gas storage tank (3) along the moving direction of the piston plate (4), and is provided with a displacement groove (611) on its outer peripheral surface for the reversing member to extend into; when the reversing member abuts against the outer peripheral surface of the positioning slider (61), the reversing member is in the first position; when the reversing member extends into the displacement groove (611), the reversing member is in the second position; An action component is connected to the gas storage tank (3) and corresponds to the position of the reversing member, and is used to push the reversing member to move in a direction close to the positioning slide block (61).

5. A refrigerant recovery device as claimed in claim 4, characterized in that: The trigger unit comprises: an adjusting rod (62) slidably disposed on the gas storage tank (3) along the moving direction of the piston plate (4), with one end extending toward the second side surface and the other end extending toward the outside of the gas storage tank (3); the adjusting rod (62) is connected to the positioning slider (61) via a connecting portion; A trigger plate (63) fixedly arranged on one end of the adjustment rod (62) facing the second side surface; When the position of the trigger plate (63) changes, the maximum volume of the air storage cavity (33) changes.

6. A refrigerant recovery device according to claim 5, characterized in that: The connecting portion comprises: A connecting rod (64), one end of which is fixedly mounted on the positioning slider (61), and the other end of which extends toward the trigger plate (63) and passes through the gas storage tank (3), the piston plate (4) and the trigger plate (63) in sequence; A clamping plate (65) rotatably disposed on an end of the connecting rod (64) away from the positioning slide block (61); Wherein, a plurality of clamping grooves (621) are evenly distributed along the axial direction on the adjusting rod (62), and the clamping plate (65) is suitable for clamping with any of the clamping grooves (621).

7. A refrigerant recovery device according to claim 4, characterized in that: The outer peripheral surface of the positioning slide block (61) is provided with a control inclined surface (612), and the control inclined surface (612) is located in the displacement groove (611); When the reversing member extends into the displacement groove (611), the positioning slider (61) is rotated so that the control inclined surface (612) can abut against the reversing member and push the reversing member to move, so that the first flow channel (31) is always in a closed state and the opening degree of the second flow channel (32) is changed.

8. A refrigerant recovery device as claimed in claim 4, characterized in that: The positioning slider (61) is provided with a through hole (613) along the moving direction of the positioning slider (61) for airflow to pass through; When the positioning slider (61) moves, the airflow located in front of the moving path of the positioning slider (61) passes through the through hole (613) and moves to the rear of the positioning slider (61).

9. A refrigerant recovery device as claimed in claim 4, characterized in that: The action components include: An operating ring (66) is rotatably disposed on the gas storage tank (3) and is disposed around the reversing member; A fixed magnet (67) fixedly disposed on the operating ring (66); A moving magnet (68) is fixedly arranged on the commutating element; The opposite ends of the fixed magnet (67) and the moving magnet (68) are repelling ends. When the operating ring (66) rotates to the position where the fixed magnet (67) and the moving magnet (68) correspond, the fixed magnet (67) pushes the moving magnet (68) to move in a direction close to the positioning slider (61), so that the switching element can move from the first position to the second position.

10. A refrigerant recovery device according to claim 9, characterized in that: An iron block (69) is fixedly disposed on the operating ring (66); When the operating ring (66) rotates to the point where the iron block (69) corresponds to the position of the moving magnet (68), the iron block (69) attracts the moving magnet (68) and moves in a direction away from the positioning slider (61), so that the switching element can move from the second position to the first position.

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