An air conditioning charging valve

Abstract

The present invention discloses an air-conditioning filling valve, which belongs to the technical field of refrigerant filling equipment, and comprises a core body having a first end and a second end, wherein a filling channel connects the first end with the second end; a wall of the filling channel has a first sealing surface and a limiting surface; a filling port connected with the filling channel is provided on the core body; a sealing column is provided in the filling channel and comprises a sealing portion and a guide portion in sequence; the sealing column can move between a first position and a second position; in the first position, the sealing column is located between the first end and the filling port, and the sealing portion abuts against the first sealing surface; in the second position, the sealing column abuts against the limiting surface, and at least part of the filling port is located between the first end and the sealing column; the sealing column of the present invention directly cooperates with the core body, and the sealing column can move when subjected to force; when filling the refrigerant, the sealing column is located at the second position; after the refrigerant filling is completed, the sealing column automatically moves to the first position, and the filling channel switches to a closed state, which can ensure the sealing effect under high-pressure environment.

Description

Technical Field

[0001] The invention relates to the technical field of refrigerant filling equipment, and in particular to an air-conditioning filling valve. Background Art

[0002] In recent years, benefiting from the rapid development of the economy and automobile industry, the automotive air-conditioning industry and its refrigeration system components have also achieved rapid development. The advancement of automotive air-conditioning structure and energy conservation and emission reduction have become the main development trends in the future. The refrigerant used in existing automotive air-conditioning generally has a system pressure of around 6MPa, and conventional air-conditioning valve cores can meet the sealing requirements of the refrigeration system under this condition.

[0003] With the iteration and update of refrigerants, the system operating pressure can reach 20MPa. Conventional air-conditioning valve cores have a large number of components and a complex overall structure, and cannot achieve reliable sealing performance under such a high-pressure environment. In addition, the rubber sealing elements used in conventional air-conditioning valve cores are prone to deformation, extrusion and other problems under high-pressure environments, which will cause air leakage and cannot meet the use requirements. This puts higher requirements on the sealing performance of the refrigeration system.

[0004] Therefore, developing and designing an air conditioning filling valve that can ensure sealing effect and service life under high-pressure environment, with a small number of parts, simple structure and good process performance is an issue that needs to be urgently solved at this stage. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides an air-conditioning filling valve, in which a sealing column directly cooperates with a core body, and the sealing column can move smoothly in the filling channel of the core body when the force is unbalanced; when filling the refrigerant, the sealing column is located at a second position, and the filling channel is in an open state, and the refrigerant is filled in turn through the filling channel and the filling port; after the refrigerant is filled, the sealing column is moved to the first position under pressure, the sealing part is tightly fitted with the first sealing surface, and the filling channel is switched to a closed state, which can ensure the sealing effect under high-pressure environment, has a small number of components, a simple structure, good process performance, and a longer service life.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides an air conditioning charging valve, comprising:

[0008] A core body, the core body having a first end and a second end, the core body having a filling channel connecting the first end and the second end; the filling channel wall having a first sealing surface near the first end, the filling channel wall having a limiting surface near the second end; a filling port communicating with the filling channel is provided on the outer peripheral surface of the core body near the second end;

[0009] A sealing column, the sealing column is arranged in the filling channel; along the direction from the first end to the second end, the sealing column comprises a sealing portion and a guide portion in sequence; when the sealing column is subjected to unbalanced force, the sealing column can move along the filling channel;

[0010] The sealing column is capable of moving between a first position and a second position; in the first position, the sealing column is located between the first end and the filling port, the sealing portion abuts against the first sealing surface, and the filling channel is in a closed state; in the second position, the sealing column abuts against the limiting surface, at least part of the filling port is located between the first end and the sealing column, and the filling channel is in an open state.

[0011] As a preferred technical solution, it also includes a nozzle body, the core body is fixed in the nozzle body and sealed with the nozzle body, the first end faces the outside of the nozzle body, and the second end faces the inside of the nozzle body.

[0012] As a preferred technical solution, the outer wall of the core body has a second sealing surface, and the inner wall of the nozzle body has a third sealing surface matching the second sealing surface; when the core body is fixed in the nozzle body, the second sealing surface fits tightly with the third sealing surface.

[0013] As a preferred technical solution, the second sealing surface and the third sealing surface are both configured as conical surfaces, and the inner diameters of the second sealing surface and the third sealing surface are gradually reduced in the direction from the first end to the second end;

[0014] And / or, the core body has an external thread, the nozzle body has an internal thread matching the external thread, and the core body is threadedly connected to the nozzle body.

[0015] As a preferred technical solution, the first sealing surface is set to be a conical surface, and the inner diameter of the first sealing surface gradually increases along the direction from the first end to the second end.

[0016] As a preferred technical solution, the shape of the sealing portion matches the first sealing surface, and the outer diameter of the sealing portion gradually increases along the direction from the first end to the second end;

[0017] And / or, the included angle of the first sealing surface is set to 60-120°.

[0018] As a preferred technical solution, the projected area of ​​the sealing portion along the direction from the first end to the second end is smaller than the projected area of ​​the guide portion along the direction from the second end to the first end; when the pressure of the internal refrigerant reaches the charging pressure, the difference between the projected area of ​​the guide portion and the projected area of ​​the sealing portion is not less than the ratio of the gravity of the sealing column to the charging pressure;

[0019] And / or, the outer diameter of the guide portion gradually decreases along a direction from the second end to the first end.

[0020] As a preferred technical solution, the filling channel forms a constriction at the second end.

[0021] As a preferred technical solution, the filling port extends to the necking and communicates with the necking;

[0022] And / or, the number of the filling ports is two or four;

[0023] And / or, the sealing column further includes a limiting portion, and the guiding portion is located between the limiting portion and the sealing portion; when the sealing column is located at the second position, the limiting portion abuts against the limiting surface.

[0024] As a preferred technical solution, the guide portion and the filling channel are clearance-matched or reciprocatingly dynamically sealed;

[0025] And / or, the first end is provided with a milling flattening;

[0026] And / or, the sealing column is made of polyetheretherketone or polytetrafluoroethylene.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. The sealing column of the present invention is directly matched with the core body, and the sealing column can move smoothly in the filling channel of the core body when the force is unbalanced; specifically, when filling the refrigerant, the sealing column is located at the second position, and the filling channel is in an open state, and the refrigerant can be filled in turn through the filling channel and the filling port; after the refrigerant is filled, the sealing column is automatically moved to the first position under pressure, and the sealing part is tightly fitted with the first sealing surface, so that the filling channel is switched to a closed state, which can ensure the sealing effect under high-pressure environment, with a small number of components, a simple structure, good process performance and a longer service life.

[0029] 2. The projection area of ​​the sealing part along the direction from the first end to the second end of the present invention is smaller than the projection area of ​​the guide part along the direction from the second end to the first end. When the refrigerant basically reaches the filling pressure, the sealing column can automatically and smoothly move to the first position under the action of the pressure difference, which ensures the accuracy of the filling pressure while reducing the amount of air leakage and ensuring the accurate fit between the sealing column and the sealing surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of a first embodiment of an air conditioning charging valve of the present invention;

[0031] Figure 2 for Figure 1 A schematic diagram of the structure of the core and the sealing column;

[0032] Figure 3 for Figure 2 Side view of

[0033] Figure 4 for Figure 2 A schematic diagram of the structure when the sealing column moves to the first position;

[0034] Figure 5 for Figure 2 The structural diagram of the middle A direction;

[0035] Figure 6 It is a structural schematic diagram of a core body and a sealing column in a second embodiment of an air conditioning charging valve of the present invention;

[0036] Figure 7 for Figure 6 A schematic diagram of the structure when the sealing column moves to the first position;

[0037] Figure 8 It is a structural schematic diagram of a core body and a sealing column in a third embodiment of an air conditioning charging valve of the present invention;

[0038] Fig. 9 This is a schematic structural diagram of the second end of a fourth embodiment of an air conditioning charging valve of the present invention.

[0039] In the figure: 1-core, 11-first end, 12-second end, 13-filling channel, 14-first sealing surface, 15-limiting surface, 16-filling port, 17-second sealing surface, 18-external thread, 19-milling flat, 2-sealing column, 21-sealing part, 22-guide part, 23-limiting part, 3-mouth body, 31-third sealing surface, 32-internal thread. DETAILED DESCRIPTION

[0040] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings. Embodiment 1

[0041] Please refer to Figure 1-Figure 5, is an embodiment of an air conditioning filling valve provided by the present invention, comprising a core body 1 and a sealing column 2, the core body 1 is made of metal and is vertically arranged, the upper end of the core body 1 is a first end 11, the lower end of the core body 1 is a second end 12, and the core body 1 has a filling channel 13 connecting the first end 11 and the second end 12; the wall of the filling channel 13 has a first sealing surface 14 near the first end 11, and the wall of the filling channel 13 has a limiting surface 15 near the second end 12; the outer peripheral surface of the core body 1 near the second end 12 is provided with a filling port 16 connected with the filling channel 13; the sealing column 2 is arranged in the filling channel 13; along the first end In the direction from the first end 11 to the second end 12, the sealing column 2 includes a sealing portion 21 and a guiding portion 22 in sequence; when the sealing column 2 is subjected to unbalanced force, it can move along the filling channel 13 between a first position and a second position; in the first position, the sealing column 2 is located between the first end 11 and the filling port 16, the sealing portion 21 abuts against the first sealing surface 14, and the filling channel 13 is in a closed state, thereby ensuring the sealing effect under high pressure environment; in the second position, the sealing column 2 abuts against the limiting surface 15, at least part of the filling port 16 is located between the first end 11 and the sealing column 2, and the filling channel 13 is in an open state, and refrigerant can be filled.

[0042] It should be noted that a clearance fit is preferably provided between the guide portion 22 and the filling channel 13. When the sealing column 2 is subjected to unbalanced force, that is, when there is a difference between the upward pressure (mainly the internal refrigerant pressure) and the downward pressure (mainly the external air pressure and gravity) exerted on the sealing column 2, the filling channel 13 will not hinder the sealing column 2 from moving along the filling channel 13. In other embodiments, a reciprocating dynamic seal may be provided between the guide portion 22 and the filling channel 13, so that the sealing column 2 can move smoothly along the filling channel 13 when the force is unbalanced.

[0043] For details, please refer to Figure 1 The present invention also includes a nozzle body 3, which is arranged on the automobile air conditioner and connected to the chamber containing the refrigerant; the core body 1 is fixed in the nozzle body 3 and sealedly connected to the nozzle body 3, the first end 11 faces the outside of the nozzle body 3, and the second end 12 faces the inside of the nozzle body 3. When the filling channel 13 is in an open state, the first end 11 is connected to the refrigerant source, and a preset filling pressure is applied to continuously fill the refrigerant.

[0044] For further information, please refer to Figure 1The core body 1 has a second sealing surface 17 on its outer wall, and the nozzle body 3 has a third sealing surface 31 matching the second sealing surface 17; when the core body 1 is fixed in the nozzle body 3, the second sealing surface 17 and the third sealing surface 31 fit tightly together to achieve sealing between the core body 1 and the nozzle body 3; specifically, the second sealing surface 17 and the third sealing surface 31 are configured as conical surfaces with the same angle, and the inner diameters of the second sealing surface 17 and the third sealing surface 31 gradually decrease in the direction from the first end 11 to the second end 12, thereby ensuring that the second sealing surface 17 and the third sealing surface 31 can fit tightly together, and by replacing the traditional rubber seal with a metal seal, the sealing performance is more reliable, thereby avoiding leakage caused by damage to the sealing ring by different refrigerants.

[0045] For clarification, please refer to Figure 1 The core body 1 has an external thread 18, and the nozzle body 3 has an internal thread 32 matching the external thread 18. The core body 1 and the nozzle body 3 are assembled and fixedly connected by threaded connection, which can ensure that the second sealing surface 17 and the third sealing surface 31 are tightly fitted.

[0046] For further information, please refer to Figure 3 A milling flat 19 should be provided at the first end 11, through which the core 1 can be conveniently twisted into the nozzle body 3 and threadedly connected with the nozzle body 3; preferably, the filling channel 13 at the first end 11 is milled, which can increase the charging and discharging rate of the refrigerant.

[0047] In this embodiment, please refer to Figure 1-Figure 4 The first sealing surface 14 is set to a conical surface, and the inner diameter of the first sealing surface 14 gradually increases in the direction from the first end 11 to the second end 12. Correspondingly, the shape of the sealing portion 21 matches the first sealing surface 14, and the surface of the sealing portion 21 is set to an arc surface. The outer diameter of the sealing portion 21 gradually increases in the direction from the first end 11 to the second end 12. When the surface of the sealing portion 21 is tightly abutted against the first sealing surface 14, it has a good sealing effect under a high-pressure environment; in other embodiments, the first sealing surface 14 can also be set to an arc surface, so that the sealing effect can be guaranteed when the sealing portion 21 abuts against the first sealing surface 14.

[0048] Based on the above examples, please refer to Figure 2In order to ensure the sealing effect, the angle α of the first sealing surface 14 is preferably set to 60-120°, and the tolerance is preferably set to ±5°; when the angle of the first sealing surface 14 is too small, the contact area between the sealing portion 21 and the first sealing surface 14 is small, and the force is too concentrated, especially in a high-pressure (20MPa) use environment, it is easy to damage the sealing column 2; when the angle of the first sealing surface 14 is too large, the contact area between the sealing portion 21 and the first sealing surface 14 is large, the force per unit area is small, and the sealing effect is not ideal. At the same time, when the sealing column 2 is subjected to force, the deformation of the contact between the sealing portion 21 and the first sealing surface 14 is small, while the guide portion 22 and the limiting portion 23 are greatly deformed due to the influence of high pressure, and the overall deformation of the sealing column 2 is uneven, which will also affect the sealing effect and service life of the sealing column 2.

[0049] In this embodiment, please refer to Figure 2 and Figure 4 The sealing column 2 also includes a limiting portion 23 located at its lower end, and the guide portion 22 is located between the limiting portion 23 and the sealing portion 21, and the outer diameter of the guiding portion 22 of the sealing column 2 is the largest; when the sealing column 2 is located at the second position, the limiting portion 23 abuts against the limiting surface 15 to position the sealing column 2; specifically, the surface of the limiting portion 23 is preferably set to an arc-shaped surface, and the limiting surface 15 and the filling channel 13 form a constriction at the second end 12, and the inner edge of the constriction abuts against the surface of the limiting portion 23 to limit the sealing column 2, and the limiting portion 23 will not block too many constrictions and the filling port 16, thereby ensuring that the internal refrigerant can fully contact the surface of the limiting portion 23, and when the refrigerant basically reaches the filling pressure, a pressure difference can be generated to automatically move the sealing column 2 upward.

[0050] For further information, please refer to Figure 2 , Figure 4 and Figure 5 In order to ensure the smoothness of refrigerant filling, two filling ports 16 are provided, and the filling ports 16 extend to the necking and are connected with the necking. The filling ports 16 and the necking are in an "I" shape at the second end 12 surface, which can increase the cross-section of the filling port 16 as much as possible while facilitating processing; in other embodiments, the filling port 16 can also be provided only on the outer peripheral surface of the core body 1, not connected with the necking, so as to effectively realize the movement of the sealing column 2 between the first position and the second position and the filling of the refrigerant.

[0051] It should be noted that the material of the sealing column 2 is preferably polyetheretherketone or polytetrafluoroethylene, which can ensure that the sealing column 2 is not damaged under high pressure and has good sealing properties.

[0052] Please refer to Figure 1-Figure 5 , the specific use process of the present invention is as follows:

[0053] The core body 1 and the nozzle body 3 are threadedly fastened together by matching external threads 18 and internal threads 32, so that the second sealing surface 17 and the third sealing surface 31 are tightly matched to achieve sealing;

[0054] At this time, the core 1 is arranged vertically, the sealing column 2 is in the second position under the action of gravity, and the filling channel 13 is in an open state, and the refrigerant can be directly filled;

[0055] When the refrigerant is filled, the sealing column 2 automatically moves upward to the first position under the action of the internal refrigerant pressure, so that the sealing portion 21 is in close contact with the first sealing surface 14, closing the filling channel 13 and achieving sealing at the same time. Embodiment 2

[0056] Please refer to Figure 6 and Figure 7 The main difference between this embodiment and the first embodiment is that the projection area of ​​the sealing portion 21 along the direction from the first end 11 to the second end 12 is smaller than the projection area of ​​the guide portion 22 along the direction from the second end 12 to the first end 11.

[0057] When filling the refrigerant, the core 1 is arranged vertically and the first end 11 is located at the upper end; in Example 1, the projected areas of the upper and lower ends of the sealing column 2 are basically the same. When the refrigerant reaches the filling pressure, the pressures on the upper and lower ends of the sealing column 2 are basically the same. Under the action of the sealing column 2's own gravity, the sealing column 2 is still at the bottom, i.e., the second position. Only when the external refrigerant stops filling, the sealing column 2 will automatically move up to the first position under the action of the pressure of the internal refrigerant and abut against the first sealing surface 14 to form a seal. On the one hand, the sealing column 2 will leak part of the refrigerant during the upward movement; on the other hand, the refrigerant needs to fill the space of the filling channel 13 vacated after the sealing column 2 moves up; the above two aspects will cause the pressure of the internal refrigerant to change, and it is impossible to ensure that the pressure of the internal refrigerant is accurately stabilized to a specific value.

[0058] In this embodiment, the projected area of ​​the lower end of the sealing column 2 is larger than the projected area of ​​the upper end. When the refrigerant approaches the filling pressure, the air pressure at the upper and lower ends of the sealing column 2 is close, and the pressure on the lower end of the sealing column 2 is gradually greater than the pressure on the upper end of the sealing column 2. When the pressure difference is greater than the gravity of the sealing column 2, the gravity can be overcome to drive the sealing column 2 to automatically move up and approach the first sealing surface 14; when the refrigerant reaches the filling pressure, the filling is completed and the external pressure disappears, and the sealing column 2 quickly abuts and seals with the first sealing surface 14 under the action of the pressure of the internal refrigerant, which can effectively reduce the refrigerant leakage and reduce the influence of the refrigerant expansion on the internal refrigerant pressure, ensuring that the internal refrigerant pressure is accurately stabilized at the filling pressure value; at the same time, since the refrigerant pressure is gradual during filling, the sealing column 2 rises relatively slowly, which can avoid the problem of sealing column 2 offset and inaccurate positioning caused by the rapid and long-distance movement of the sealing column 2 from bottom to top when the external pressure disappears.

[0059] Specifically, assuming that the projection area of ​​the sealing portion 21 is S1, the air pressure at the sealing portion 21 is P1; the projection area of ​​the guide portion 22 is S2, the air pressure at the guide portion 22 is P2; the weight of the sealing column 2 is m, and the acceleration of gravity is g, then the pressure at the sealing portion 21 is F1=P1*S1, and the pressure at the guide portion 22 is F2=P2*S2; during the refrigerant filling process, the air pressure P1 at the sealing portion 21 is greater than the air pressure P2 at the guide portion 22, and F1+mg≥F2, which can make the sealing column 2 unbalanced and move to the second position, the filling channel 13 is in an open state, and, as the refrigerant filling proceeds, the air pressure P2 at the guide portion 22 gradually increases; when the refrigerant filling is completed , the pressure of the internal refrigerant reaches the charging pressure, the air pressure at the sealing part 21 and the guide part 22 is the same, that is, P1=P2. In order to ensure that the sealing column 2 can automatically float upward to the first position and abut against the first sealing surface 14 to achieve sealing, F2-F1≥mg, that is, S2-S1≥mg / P, where P is the charging pressure of the refrigerant, that is, the difference between the projected area of ​​the guide part 22 and the projected area of ​​the sealing part 21 is not less than the ratio of the gravity of the sealing column 2 to the charging pressure; when the refrigerant is filled, the external charging pressure is cancelled, and the air pressure P1 at the sealing part 21 is reduced to atmospheric pressure. At this time, F2 is much greater than F1, which can make the sealing part 21 fit closely with the first sealing surface 14 to ensure the sealing effect.

[0060] In this embodiment, please refer to Figure 6 and Figure 7The guide portion 22 is tapered, and the outer diameter of the guide portion 22 gradually decreases in the direction from the second end 12 to the first end 11. When the pressure of the internal refrigerant reaches the filling pressure and the sealing column 2 floats upward, the sealing column 2 moves in the direction from the second position to the first position, and the projection area S1 of the sealing portion 21 gradually decreases, so that the difference between F2 and F1 gradually increases, which can promote the sealing column 2 to move to the first position more quickly; accordingly, the guide portion 22 is clearance-matched with the filling channel 13, and the wall of the filling channel 13 is tapered to match the guide portion 22, ensuring that the sealing column 2 can move smoothly along the filling channel 13. Embodiment 3

[0061] Please refer to Figure 8 The main difference between this embodiment and the first embodiment is that the surface of the sealing portion 21 is set to be a conical surface matching the first sealing surface 14. When in the first position, the surface of the sealing portion 21 is tightly fitted with the first sealing surface 14, which can also ensure the sealing effect. Embodiment 4

[0062] Please refer to Fig. 9 The main difference between this embodiment and the first embodiment is that there are four filling ports 16, and the filling ports 16 and the constriction are in a "cross" shape at the second end 12, which can improve the refrigerant filling efficiency and facilitate the movement of the sealing column 2 between the first position and the second position.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air conditioning filling valve, characterized in that: include: A core body (1), the core body (1) having a first end (11) and a second end (12), the core body (1) having a filling channel (13) in communication with the first end (11) and the second end (12); a wall of the filling channel (13) having a first sealing surface (14) near the first end (11), and a wall of the filling channel (13) having a limiting surface (15) near the second end (12); and a filling port (16) communicating with the filling channel (13) is provided on an outer peripheral surface of the core body (1) near the second end (12); A sealing column (2), the sealing column (2) being arranged in the filling passage (13); along the direction from the first end (11) to the second end (12), the sealing column (2) comprises a sealing portion (21) and a guide portion (22) in sequence; when the sealing column (2) is subjected to an unbalanced force, the sealing column (2) is capable of moving along the filling passage (13); The sealing column (2) is capable of moving between a first position and a second position; in the first position, the sealing column (2) is located between the first end (11) and the filling port (16), the sealing portion (21) abuts against the first sealing surface (14), and the filling channel (13) is in a closed state; in the second position, the sealing column (2) abuts against the limiting surface (15), at least a portion of the filling port (16) is located between the first end (11) and the sealing column (2), and the filling channel (13) is in an open state.

2. An air conditioning charging valve according to claim 1, characterized in that: It also comprises a nozzle body (3), wherein the core body (1) is fixed inside the nozzle body (3) and is sealedly connected to the nozzle body (3), the first end (11) faces the outside of the nozzle body (3), and the second end (12) faces the inside of the nozzle body (3).

3. An air conditioning charging valve according to claim 2, characterized in that: The core body (1) has a second sealing surface (17) on its outer wall, and the nozzle body (3) has a third sealing surface (31) matching the second sealing surface (17); when the core body (1) is fixed in the nozzle body (3), the second sealing surface (17) and the third sealing surface (31) are tightly fitted.

4. An air conditioning charging valve according to claim 3, characterized in that: The second sealing surface (17) and the third sealing surface (31) are both configured as conical surfaces, and the inner diameters of the second sealing surface (17) and the third sealing surface (31) gradually decrease in a direction from the first end (11) to the second end (12); And / or, the core body (1) has an external thread (18), the nozzle body (3) has an internal thread (32) matching the external thread (18), and the core body (1) and the nozzle body (3) are threadedly connected.

5. The air conditioning charging valve according to claim 1, characterized in that: The first sealing surface (14) is configured as a conical surface, and the inner diameter of the first sealing surface (14) gradually increases in a direction from the first end (11) to the second end (12).

6. An air conditioning charging valve according to claim 5, characterized in that: The shape of the sealing portion (21) matches the first sealing surface (14), and the outer diameter of the sealing portion (21) gradually increases in a direction from the first end (11) to the second end (12); And / or, the included angle of the first sealing surface (14) is set to 60-120°.

7. An air conditioning charging valve according to claim 1, characterized in that: The projection area of ​​the sealing portion (21) along the direction from the first end (11) to the second end (12) is smaller than the projection area of ​​the guide portion (22) along the direction from the second end (12) to the first end (11); when the pressure of the internal refrigerant reaches the charging pressure, the difference between the projection area of ​​the guide portion (22) and the projection area of ​​the sealing portion (21) is not less than the ratio of the gravity of the sealing column (2) to the charging pressure; And / or, the outer diameter of the guide portion (22) gradually decreases in a direction from the second end (12) to the first end (11).

8. An air conditioning charging valve according to claim 1, characterized in that: The filling channel (13) forms a constriction at the second end (12).

9. An air conditioning charging valve according to claim 8, characterized in that: The filling port (16) extends to the necking and is in communication with the necking; And / or, the number of the filling ports (16) is two or four; And / or, the sealing column (2) further comprises a limiting portion (23), the guiding portion (22) being located between the limiting portion (23) and the sealing portion (21); when the sealing column (2) is located at the second position, the limiting portion (23) abuts against the limiting surface (15).

10. An air conditioning charging valve according to claim 1, characterized in that: The guide portion (22) and the filling channel (13) are clearance-fitted or reciprocatingly dynamically sealed; And / or, a milling flattening (19) is provided at the first end (11); And / or, the sealing column (2) is made of polyetheretherketone or polytetrafluoroethylene.

Images