CN210461809U - Check valve connecting device and air conditioning system - Google Patents

Abstract

The utility model provides a check valve connecting device and air conditioning system. The one-way valve connecting device comprises a shell, a valve core and an elastic piece, wherein the valve core is arranged in the shell and can move between an opening position and a closing position, and the elastic piece is sleeved on the valve core to promote the valve core to move from the opening position to the closing position; the one-way valve connecting device comprises at least one sealing ring sleeved on the valve core, and when the sealing ring is contacted with the inner wall of the shell, a passage of the one-way valve connecting device is closed; and the safety ring is arranged in the shell, the end part of the safety ring is provided with at least one sealing ring, and the sealing ring is fixed at the end part of the safety ring and at least used for being connected with the refrigeration pipeline in a sealing way. The utility model discloses a check valve connecting device is through setting up the sealing washer on the case and providing the safety ring that is fixed with the sealing ring, and the sealing ring can not drop, can realize to air conditioning system's refrigeration pipeline and with shells inner wall between multiple sealed.

Description

Check valve connecting device and air conditioning system

Technical Field

The utility model discloses it is general to relate to valve technical field. And more particularly, to a check valve connecting device, and an air conditioning system having the same.

Background

In the manufacturing process of the air conditioning system, the air tightness of the whole air conditioning system pipeline needs to be detected, and the refrigerant can be filled after the detection is qualified. In addition, refrigerant leakage is the most common fault during the use of the air conditioning system, and once leakage occurs, environmental pollution is easily caused, and the maintenance cost and time are increased. Therefore, at present, a charge pressure retaining valve or a check valve is generally provided at a refrigerant pipe of a component such as an evaporator or a condenser of an air conditioning system, for connecting the refrigerant pipe of the air conditioning system and a charging device, performing leak detection by charging nitrogen gas, for example, into the refrigerant pipe of the air conditioning system, and maintaining sealing of the refrigerant pipe by the check valve after completion of charging.

Patent CN200982414Y discloses a valve for air conditioner evaporator, and patent CN201202855Y discloses a charging pressure retaining valve for air conditioner indoor unit. In the solutions disclosed in the above documents, the inflation pressure retaining valve generally includes a valve body or a housing that can be connected to the refrigeration pipeline and the inflation device, respectively, a valve core that can reciprocate along the valve body is provided in the valve body, and a spring that fits with the valve core, a rubber ring is provided near the internal thread port of the valve body, and a rubber plug is provided at the end of the valve core, a pressing sleeve is connected with the rubber ring and the rubber plug, respectively, and presses the rubber ring through the connection portion of the refrigeration pipeline, the rubber ring presses the pressing sleeve, and the pressing sleeve presses the rubber plug to achieve sealing. That is to say, only obtain sealed effect through the tight fit of rubber circle with the valve body and the tight fit of rubber buffer and case and valve body among the existing scheme, rubber circle and rubber buffer easily drop and sealed effect is limited, and the inefficacy risk is great. Moreover, the joint of the inflation pressure retaining valve and the refrigeration pipeline is usually only locked and sealed by threads, and even if the raw material belt is wound for auxiliary sealing, the risk of leakage of a large refrigerant still exists.

In addition, the valve disclosed in the above patent is matched with the rubber stopper through the arc-shaped protrusion at the end of the valve core, and the valve is closed when the arc-shaped protrusion is in contact with the rubber stopper, and is opened otherwise. With this arrangement, the valve is opened as soon as the valve element is displaced, so that the possibility of leakage is high, and the entire valve cannot operate normally as soon as the single rubber stopper fails.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the problem among the above-mentioned prior art, provide a check valve connecting device to obtain more perfect effectual sealed effect.

To this end, according to an aspect of the present invention, there is provided a check valve connecting device, comprising: one end of the shell is connected with a refrigerating pipeline of the air conditioning system, and the other end of the shell is connected with an air charging device; a valve spool disposed in the housing and movable between an open position and a closed position; the elastic piece is sleeved on the valve core to urge the valve core to move from the opening position to the closing position; the one-way valve connecting device comprises at least one sealing ring sleeved on the valve core, and when the sealing ring is contacted with the inner wall of the shell, a passage of the one-way valve connecting device is closed; and a safety ring disposed within the housing; the end part of the safety ring is provided with at least one sealing ring, the sealing ring is fixed on the end part of the safety ring, and the sealing ring is at least used for being connected with the refrigeration pipeline in a sealing mode.

In accordance with the above-described concepts, the present invention may further include any one or more of the following alternatives.

In certain alternatives, the safety ring includes a first end disposed toward the valve cartridge and a second end disposed toward a refrigerant conduit; wherein the seal ring comprises a first seal ring secured to the second end.

In certain alternatives, the first sealing ring is also for sealing the safety ring against the inner wall of the housing, wherein the first sealing ring is over-molded with the second end of the safety ring.

In some optional forms, the first sealing ring is further used for sealing the safety ring and the inner wall of the housing, wherein the first sealing ring is sleeved on the second end of the safety ring and covers the second end, a plurality of bayonets or a plurality of hooks protruding radially outward are arranged on the second end of the safety ring along the outer wall, and a plurality of hooks or a plurality of bayonets protruding radially inward are arranged on the first sealing ring.

In some optional forms, the first sealing ring is nested on the second end of the safety ring and abuts against the inner wall of the second end, wherein a limiting ring or a plurality of limiting claws for fixing the first sealing ring is arranged on the second end of the safety ring along the inner wall.

In certain alternatives, the sealing ring further comprises a second sealing ring disposed at the first end of the safety ring, the second sealing ring sealingly abutting between the first end of the safety ring and a shoulder provided on an inner wall of the housing.

In some alternatives, the housing has a rib projecting axially from the shoulder toward the first end to form a groove for receiving the second seal ring.

In certain alternatives, the one-way valve connection includes first and second spaced apart seals fitted over the valve spool, the first seal being disposed adjacent the end of the housing to which the inflator is connected.

In some alternatives, the diameter of the second sealing ring is larger than that of the first sealing ring, and the passage of the one-way valve connecting device is closed when the second sealing ring or the first sealing ring is tightly attached to the inner wall surface of the shell.

According to another aspect of the present invention, there is provided an air conditioning system, comprising the check valve connecting device as described above.

The utility model discloses a check valve connecting device is through setting up the sealing washer on the case and providing the safety ring that is fixed with the sealing ring, and the sealing ring can not drop, can realize with air conditioning system's refrigeration pipeline and with shells inner wall between multiple sealed, because the various problems that sealed inefficacy leads to when avoiding the refrigerant to leak. The safety ring is arranged without influencing the movement of the valve core in the shell, the structural design can be changed according to actual needs so as to obtain sealing abutting fit with the inner wall of the shell, and the application range is wide.

Drawings

Other features and advantages of the present invention will be better understood from the following detailed description of alternative embodiments, taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts, and in which:

fig. 1 is an overall schematic view of a check valve connecting device according to an embodiment of the present invention;

FIG. 2 is a general schematic view of the check valve connection assembly of FIG. 1 from another perspective with the valve spool in a closed position such that the check valve connection assembly is in a closed state;

FIG. 3 is an exploded view of the check valve connection in a closed position;

FIG. 4 is an exploded view of the check valve coupling device in a closed position from another perspective;

fig. 5a and 5b are exploded schematic views of a safety ring according to an embodiment;

fig. 6a and 6b are exploded schematic views of a safety ring according to another embodiment;

fig. 7a and 7b are exploded schematic views of a safety ring according to yet another embodiment;

FIG. 8 is an end schematic view of the check valve connection;

FIG. 9 is a schematic cross-sectional view taken along line A-A of FIG. 8;

FIG. 10 is an exploded view similar to FIG. 3 showing the check valve connection in an open condition;

FIG. 11 is an exploded view similar to FIG. 4, showing another perspective of the check valve attachment in an open condition;

FIG. 12 is a cross-sectional schematic view similar to FIG. 6 showing the check valve connection in an open state.

Detailed Description

The practice and use of the embodiments are discussed in detail below. It should be understood, however, that the specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention. The description herein of the structural positions of the respective components, such as the directions of upper, lower, top, bottom, etc., is not absolute, but relative. When the respective components are arranged as shown in the drawings, these direction expressions are appropriate, but when the positions of the respective components in the drawings are changed, these direction expressions are changed accordingly.

Herein, "axial" refers to a direction along the length or longitudinal direction of the housing of the check valve connecting device, and "radial" refers to a direction along the width or transverse direction of the housing.

Referring first to fig. 1 and 2, the check valve connection device of the present invention is used for connecting a refrigeration pipeline and an inflator of an air conditioning system, wherein the check valve connection device includes a housing 10, one end portion 11 of the housing 10 is provided with an internal thread 13 for connecting the refrigeration pipeline of the air conditioning system, and the other end portion 12 is used for connecting the inflator. It will be appreciated that the interior of the housing 10 is provided with a valve spool 20 movable between an open position and a closed position, when the valve spool 20 is in the closed position, a seal is formed by at least one seal provided within the housing, such that the one-way valve connection is in a closed state, as shown in fig. 2; after the end portion 12 of the housing 10 is connected to the inflator, an ejector pin disposed in the inflator may push the valve core 20 to urge the valve core 20 to move toward the open position, so as to disengage the sealing element from the sealing, the check valve connection device is in the open state, and gas may enter the refrigeration pipeline through a gap of the valve core to perform an inflation operation; after the inflation is finished, under the internal gas pressure, the valve core is urged to move from the opening position to the closing position by means of the elastic reset action of the elastic piece sleeved on the valve core, and the sealing state of the one-way valve connecting device is realized again.

According to the inventive concept, the one-way valve connection advantageously comprises at least one sealing ring, which is fitted on the valve cartridge, and a safety ring, which is arranged in the housing 10, is arranged adjacent to the end 11 of the housing 10 provided with the internal thread 13, and combines a plurality of alternative structural designs to obtain a multiple sealing effect. In particular, the safety ring has at least one sealing ring fixed to its end for sealing connection with the refrigeration circuit and, in some embodiments, for sealing the safety ring against the inner wall of the housing, so that the sealing effect is achieved by a tight fit of the safety ring into the housing, which is simple, safe and effective.

Fig. 3 to 12 show a check valve connecting device according to an embodiment of the above concept, wherein fig. 3, 4 and 9 show the check valve connecting device in a closed state, and fig. 10 to 12 show the check valve connecting device in an open state.

With reference to fig. 3, 4 and 9, in this embodiment, the valve spool 20 is exemplified by a needle valve, having a longitudinal channel for the passage of gas and an annular groove for housing a seal. Specifically, the valve spool 20 includes a first end 21 toward the end 12 of the housing 10 and a second end 22 toward the end 11 of the housing 10, and an annular rib 23 at a substantially central location. The first and second ends 21, 22 have a generally cruciform cross-sectional shape to form longitudinal channels, and the annular rib 23 serves to snap the resilient member 50 onto the second end 22 and to assist in forming an annular groove on the first end 21. This will be described in detail below.

The safety ring comprises a first end arranged towards the valve core 20 and a second end arranged towards the end 11 of the housing to which the refrigerant conduit is connected, and can have a plurality of alternative structural designs according to different practical requirements. In the illustrated embodiment, the safety ring 70 is provided in a hollow tubular shape, including a tubular portion 73 provided with a through hole 76 for the valve element 20 to pass through without obstructing the movement of the valve element, while the first end of the safety ring 70 is also used to abut against the elastic member 50 to urge the elastic member to elastically return.

Alternatively, the first and second ends of the safety ring 70 may be provided as first and second flanges 71 and 72 extending radially outward from the outer walls of the two ends of the tubular portion 73, respectively. The first flange 71 of the safety ring 70 is disposed toward the spool 20 and abuts against a shoulder 15 provided on the inner wall of the housing 10, and the second flange 72 is disposed toward the internal thread 13 of the housing 10. A first sealing ring 80 is fixed to the second flange 72 to provide a seal between the second flange 72 of the safety ring 70 and the joint portion of the refrigeration duct, and in some embodiments, the inner wall of the shell 10.

In some embodiments, the first sealing ring may be sleeved on the second flange of the safety ring and cover the second flange, so that the above-mentioned functions of sealing the joint of the refrigeration pipeline and sealing between the safety ring and the inner wall of the shell can be simultaneously achieved. The first sealing ring is provided with a plurality of clamping hooks or a plurality of clamping hooks protruding outwards in the radial direction, and the second sealing ring is provided with a plurality of clamping hooks or a plurality of clamping hooks protruding inwards in the radial direction. In the embodiment shown in fig. 5a and 5b, the second flange 72 of the safety ring 70 may be uniformly distributed with a plurality of hooks 74 protruding outward in the radial direction along the outer wall, for example, four hooks symmetrically arranged, and correspondingly, the first sealing ring 80 may be provided with a plurality of bayonets 81 matching with the plurality of hooks 74, so as to fix the first sealing ring 80 to the second flange 72 in a snap-fit manner. Of course, it is also possible to directly interferingly fit the first sealing ring 80 on the outer wall of the second flange 72. As mentioned above, the first seal ring 80 wraps around the second flange, i.e. the first seal ring 80 may be provided with a radially inwardly projecting annular lip 82, which annular lip 82 may abut the end face of the second flange 72 of the safety ring 70 after clamping to achieve an effective seal.

In some embodiments, the first sealing ring may be inserted on the second flange of the safety ring and abut against an inner wall of the second flange, and a limiting ring or a plurality of limiting claws may be disposed on the second flange of the safety ring along the inner wall for supporting and fixing the first sealing ring. As shown in fig. 6a and 6b, in this embodiment, compared to the above embodiments, the first sealing ring 80a may not have a structure such as a bayonet or a hook, which reduces the process difficulty and saves the development cost. Accordingly, the safety ring 70a may be provided with a plurality of spaced-apart claws 72a along the inner wall of the second flange 71 a. As shown in fig. 6a and 6b, the outer wall of the second flange 71a of the safety ring 70a may have a plurality of openings 73a, and as mentioned above, when the first sealing ring is provided with the hooks engaged with the openings, the safety ring 70a is not only suitable for being nested in the sealing ring of the inner wall, but also suitable for being nested in the sealing ring of the outer wall. Alternatively, in some embodiments, in addition to the annular surface 81a abutting the inner wall of the second flange 71a of the safety ring, the first sealing ring 80a may be provided with an annular step 82a projecting axially to cooperate with the retaining pawl 72a, assisting in promoting the stability of the fixing and providing an effective seal, in particular with the joint of the refrigeration duct.

Fig. 7a and 7b illustrate one embodiment of the over-molding of the first seal ring 80b with the safety ring 70 b. The first sealing ring 80b can be provided with a positioning structure 81b, the second flange 71b of the safety ring 70b is provided with a corresponding matching structure 72b, and the first sealing ring 80b and the safety ring 70b are molded into a whole through an injection molding process, so that the first sealing ring is permanently fixed, and the joint of the first sealing ring to the refrigeration pipeline and the seal between the safety ring and the inner wall of the shell can be simultaneously obtained.

No matter the fixed mode between the second end of first sealing ring and safety ring is adopting two shot moulding or block connection, it should be understood that, the second end of safety ring can be as the installation bearing structure of first sealing ring, helps preventing that first sealing ring from droing at the in-process of installation transportation to can assemble the safety ring to just realize sealed, reduce the assemble duration after the casing.

Referring to fig. 9, in the embodiment where the first sealing ring 80 is sleeved on the second flange 72 of the safety ring 70, after the safety ring 70 is installed in place, since the first sealing ring 80 is sleeved on the outer wall of the second flange 72 and covers the end surface of the second flange 72, the first sealing ring 80 not only can satisfy the sealing between the safety ring 70 and the inner wall of the shell 10, but also can realize the sealing between the safety ring 70 and the joint of the refrigeration pipeline. In some embodiments, the inner wall of the housing 10 may be provided with a radially inwardly projecting boss 14 to form a sealing surface for cooperating with the first sealing ring 80 to more effectively achieve a leakage-proof effect. In other words, the first sealing ring 80 provides a first protection against refrigerant leakage.

In certain embodiments, the one-way valve connection device of the present invention further comprises a second sealing ring disposed at the first end of the safety ring 70. As can be seen in fig. 9, the second sealing ring 60 is arranged at a first end of the safety ring 70, i.e. between the first flange 71 and a shoulder 15 provided on the inner wall of the housing 10, thereby additionally providing a seal between the first flange 71 of the safety ring 70 and the inner wall of the housing 10. In some embodiments, the inner wall of the housing 10 is provided with a rib 16 projecting axially from the shoulder 15 towards the first flange 71 to form a groove for receiving the second sealing ring 60. Thereby, the second seal ring 60 realizes the second protection against the refrigerant leakage. Even if adopt the first sealing ring 80a that nests in the safety ring shown in fig. 6a and fig. 6b, because the existence of second sealing ring 60, the utility model discloses a check valve connecting device also can guarantee the reliable sealed between safety ring and the casing and between the joint with the refrigeration pipeline.

It should be understood that the second seal ring 60 may also be secured to the first end of the safety ring 70, i.e., the first flange 71, as may be the first seal ring 80, if desired.

In some embodiments, the secondary seal may also be achieved by wrapping a raw tape while connecting the refrigeration duct of the air conditioning system to the internal threads 13 of the housing 10. Thus, the utility model discloses a check valve connecting device just is provided with at least triple leak protection with the articulate department of refrigeration pipeline, prevents the refrigerant leakage more effectively.

As can also be seen in fig. 3 and 4, the safety ring 70 may comprise a plurality of jaws 75 extending radially and obliquely outwards from the first flange 71 towards the second flange 72, said plurality of jaws 75 being equispaced along the circumference of the safety ring, for example two jaws arranged symmetrically, and being intended to be snapped to the inner wall of the housing 10. In some embodiments, the bosses 14 on the inner wall of the housing 10 also provide an abutment surface that cooperates with the pawl 75 and is disposed opposite the sealing surface described above, as shown in fig. 9. When the safety ring 70 is assembled, the safety ring 70 is inserted from the end 11 of the housing 10, the claws 75 of the safety ring 70 are pressed by the bosses 14 to be elastically deformed, and once the claws 75 pass through the bosses 14 and are elastically restored, the claws can be clamped on the abutting surfaces of the bosses 14. At the same time, the first seal ring 80 disposed on the second flange 72 is synchronized in position. Furthermore, as mentioned above, the safety ring 70 is also used to abut against the elastic member 50, and when the safety ring 70 is mounted in place, the elastic member 50 abuts between the safety ring 70 and the annular rib 23 of the valve spool 20 and urges the valve spool 20 to the closed position, so that the check valve connecting device is in the closed state shown in fig. 9. It will be appreciated that in this embodiment the resilient member takes the form of a compression spring, and in alternative constructions the resilient member may take other forms.

In some embodiments, the seal on the valve cartridge 20 may include a seal ring received on the first end 21 of the valve cartridge 20, and the passage of the check valve connection is closed when the seal ring contacts the inner wall of the housing. In the embodiment shown in the figures, the valve core 20 comprises a first sealing ring 30 and a second sealing ring 40 arranged at intervals, and the first end 21 is provided with a first annular groove 23 for accommodating the first sealing ring 30, so that at least the sealing between the valve core 20 and the inner wall of the housing 10 is provided by means of the first sealing ring 30. The first end 21 is also correspondingly provided with a second annular groove 24 for receiving a second sealing ring 40. Advantageously, the first sealing ring 30 is arranged adjacent to the end 11 of the housing 10 to which the inflator is connected, and the second sealing ring 40 has a diameter greater than that of the first sealing ring 30. When the valve core 20 is in the closed position, the second sealing ring 40 can be matched with the inner wall of the shell for sealing, and even if the sealing between the first sealing ring 30 and the inner wall of the shell 10 fails, the second sealing ring 40 can ensure the sealing between the first sealing ring and the inner wall of the shell, and the passage of the one-way valve connecting device is kept closed. In this manner, the first and second seal rings 30, 40 provide dual protection of the seal between the valve spool 20 and the housing 10.

As best shown in fig. 9, in some embodiments, the inner wall of the housing 10 may be provided with a tapered surface 17 that slopes radially inward and mates with the second seal ring 40, the tapered surface 17 having a minimum diameter that is less than the diameter of the second seal ring 40 and greater than the diameter of the first seal ring 30, and the maximum diameter of the tapered surface 17 that is greater than or equal to the diameter of the second seal ring 40. Thus, the tapered surface 17 does not affect the stroke of the first seal ring 30, and abrasion of the first seal ring 30 is avoided. At the same time, the conical surface 17 ensures a tight fit with the second sealing ring 40 to obtain the double protection described above.

In some embodiments, to avoid wear of the first seal ring 30, the inner wall surface 18 of the inner wall of the housing 10 that sealingly engages the first seal ring 30 may also be provided with a tapered slope. The diameter of the inner wall surface 18 may gradually decrease toward the end 12 of the housing, i.e., the diameter of the inner wall surface 18 toward the first section of the end 12 is smaller than the diameter of the first seal ring 30, and the diameter toward the end section of the end 11 of the housing is larger than the diameter of the first seal ring 30, so that as the valve element 20 moves from the open position toward the closed position, the first seal ring 30 also gradually engages the inner wall surface 18 to achieve a sealing effect.

Fig. 10 to 12 show the check valve connecting device in an open state. As best seen in fig. 12, in this condition the safety ring 70 and the first 80 and second 60 sealing rings remain sealed against the inner wall of the housing. The end 11 of the housing 10 is screwed to the refrigerant line of the air conditioning system, the end 12 is connected to the air charging device, the valve core 20 is pushed open by a thimble provided in the air charging device to move to the open position, and the elastic member 50 disposed between the safety ring 70 and the annular rib 23 of the valve core is compressed. At this point, it can be seen from fig. 12 that the first and second seal rings 30, 40 are out of sealing engagement with the housing. Gas can enter the refrigeration pipeline along the longitudinal channel of the valve core, and then the inflation can be finished. After the inflation is finished, the elastic element 50 elastically resets and drives the valve core 20 to move to the closed position, and the first sealing ring 30 and the second sealing ring 40 of the valve core 20 are in sealing contact with the inner wall of the housing again, that is, the closed state shown in fig. 9 is restored.

As can be seen from the above description, the check valve connection device of the present invention can obtain multiple protections against refrigerant leakage without greatly modifying the existing device by providing the safety ring with the sealing ring; the safety ring has simple structure and easy assembly, and can be quickly and reliably fixed with the shell; the cooperation mode of sealing ring and safety ring provides the fixed stay to the sealing ring, avoids droing of sealing ring in the transportation installation to can change the sealing ring as required. Compared with the existing design, the valve core of the one-way valve connecting device additionally has double sealing protection. Therefore, the utility model discloses when using including but not limited to various air conditioning systems such as domestic air conditioner, commercial air conditioner, vehicle air conditioner, can effectively obtain diversified comprehensive and reliable sealing protection.

It should be understood that the various components and features described herein may be made from a variety of materials, including but not limited to polymers, rubbers, foams, metals, and other suitable materials or combinations of materials known to those skilled in the art. The embodiments shown in fig. 1-12 illustrate only alternative shapes, sizes and arrangements of various alternative components of the check valve connection device according to the present invention, however, they are merely illustrative and not limiting, and other shapes, sizes and arrangements may be adopted without departing from the spirit and scope of the present invention.

The technical content and technical features of the present invention have been disclosed above, but it should be understood that various changes and modifications can be made to the concept disclosed above by those skilled in the art under the inventive concept of the present invention, and all fall within the scope of the present invention. The above description of embodiments is intended to be illustrative, and not restrictive, and the scope of the invention is defined by the appended claims.

Claims (10)

1. A check valve attachment, comprising: one end of the shell is connected with a refrigerating pipeline of the air conditioning system, and the other end of the shell is connected with an air charging device; a valve spool disposed in the housing and movable between an open position and a closed position; the elastic piece is sleeved on the valve core to urge the valve core to move from the opening position to the closing position;

the one-way valve connecting device is characterized by comprising at least one sealing ring sleeved on the valve core, and when the sealing ring is contacted with the inner wall of the shell, a passage of the one-way valve connecting device is closed; and a safety ring disposed within the housing; the end part of the safety ring is provided with at least one sealing ring, the sealing ring is fixed on the end part of the safety ring, and the sealing ring is at least used for being connected with the refrigeration pipeline in a sealing mode.

2. The check valve attachment of claim 1, wherein the safety ring includes a first end disposed toward the valve cartridge and a second end disposed toward a refrigerant line; wherein the seal ring comprises a first seal ring secured to the second end.

3. The check valve connection device of claim 2, wherein the first sealing ring is further configured to seal with a safety ring against an inner wall of the housing, wherein the first sealing ring is over-molded with the second end of the safety ring.

4. The check valve connection device according to claim 2, wherein the first sealing ring is further used for sealing the safety ring and the inner wall of the housing, wherein the first sealing ring is sleeved on the second end of the safety ring and covers the second end, wherein the second end of the safety ring is provided with a plurality of bayonets or a plurality of hooks protruding radially outward along the outer wall, and the first sealing ring is provided with a plurality of hooks or a plurality of bayonets protruding radially inward and matching with the hooks or the bayonets.

5. The one-way valve connecting device according to claim 2, wherein the first sealing ring is nested on the second end of the safety ring and abuts against the inner wall of the second end, wherein a limiting ring or a plurality of limiting claws for fixing the first sealing ring is arranged on the second end of the safety ring along the inner wall.

6. The check valve connection device of any of claims 2-5, wherein the sealing ring further comprises a second sealing ring disposed at the first end of the safety ring, the second sealing ring sealingly abutting between the first end of the safety ring and a shoulder provided on an inner wall of the housing.

7. The one-way valve attachment of claim 6, wherein the housing includes a rib projecting axially from the shoulder toward the first end to form a groove for receiving the second seal ring.

8. The check valve connection according to claim 6, comprising first and second spaced apart sealing rings sleeved on the spool, the first sealing ring being disposed adjacent an end of the housing to which the inflator is connected.

9. The check valve connecting device according to claim 8, wherein the diameter of the second sealing ring is larger than that of the first sealing ring, and the passage of the check valve connecting device is closed when the second sealing ring or the first sealing ring abuts against the inner wall surface of the housing.

10. An air conditioning system, characterized in that it comprises a non-return valve connection device according to any one of claims 1 to 9.

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