CN116265789A - Valve assembly, stop valve and refrigerating system thereof - Google Patents

Abstract

The invention relates to the technical field of refrigeration, in particular to a valve assembly, a stop valve and a refrigeration system thereof. The valve assembly comprises a core body and a core rod, wherein the core rod is arranged in the core body, a first valve port is formed in the inner wall of the core body, and the core rod can move along the axial direction of the core body to open/close the first valve port; the core body comprises an inflation connector, a positioning part and a core seat, wherein the inflation connector, the positioning part and the core seat are integrally arranged, the inflation connector is arranged on one side of the positioning part away from the first valve port, the core seat is arranged on one side of the positioning part close to the first valve port, and the core seat is used for being fixedly connected with an external element. The inflatable connector, the positioning part and the core seat are integrally arranged, three elements are not required to be respectively processed, assembly is not required, and processing cost is reduced; and because integrated into one piece, simple structure is stable, does not need to set up extra sealing member between location portion and the core print seat any more, has strengthened the sealing performance of valve subassembly.

Description

Valve assembly, stop valve and refrigerating system thereof

Technical Field

The invention relates to the technical field of refrigeration, in particular to a valve assembly, a stop valve and a refrigeration system thereof.

Background

In a refrigeration system, a stop valve plays an important role in stopping a medium in a pipeline where the stop valve is located, and a structure for supplementing refrigerant to the refrigeration system in the stop valve is a valve assembly.

The existing valve assembly has the problems of difficult machining, high machining cost, easy leakage and the like.

Disclosure of Invention

Based on the problems, the invention provides a valve assembly, which aims at the technical problems of difficult processing, high processing cost and easy leakage, and the technical scheme is as follows:

a valve assembly comprising a core and a core rod, wherein the core rod is arranged in the core, a first valve port is formed on the inner wall of the core, and the core rod can move along the axial direction of the core to open/close the first valve port; the core body comprises an inflation connector, a positioning part and a core seat, wherein the inflation connector, the positioning part and the core seat are integrally arranged, the inflation connector is arranged on one side of the positioning part away from the first valve port, the core seat is arranged on one side of the positioning part close to the first valve port, and the core seat is used for being fixedly connected with an external element.

The inflatable connector, the positioning part and the core seat are integrally arranged, so that three elements are not required to be respectively processed and assembled, and the processing cost is reduced; the valve assembly is integrally formed, so that the valve assembly is simple and stable in structure, and an additional sealing piece is not required to be arranged between the positioning part and the core seat, so that the sealing performance of the valve assembly is enhanced; meanwhile, one end of the positioning part does not need to extend into the core seat to be connected, and the wall thickness is not required to be as thick as that of split connection, so that the flow of medium in the core body is increased, and the filling quantity is increased.

In one embodiment, the air charging connector, the positioning portion and the core seat are all hollow, and the first valve port is formed on the inner wall of the core body between the positioning portion and the core seat; the core rod comprises a first section and a second section which are connected with each other, the first section at least partially penetrates through the positioning part, and the second section at least partially is positioned in the core seat.

In one embodiment, a first conical surface is formed on one side of the second section, facing the positioning portion, and a second conical surface is formed on the inner wall of the first valve port, the first conical surface can be abutted to the second conical surface, and an included angle α between the first conical surface and the axis of the core rod is smaller than an included angle β between the second conical surface and the axis of the core rod.

When the core rod is in the valve closing position, the first conical surface and the second conical surface form a linear seal, so that the combination between the first conical surface and the second conical surface is enhanced, and the medium leakage is prevented.

In one embodiment, a stem groove is formed in the outer peripheral side of the second section, and a first sealing element is embedded in the stem groove and can be abutted with the first valve port so as to seal the first valve port.

The first sealing piece is embedded in the core rod groove, and the core rod groove forms limit on the first sealing piece in three directions, so that the first sealing piece is prevented from falling out of the core rod groove. The combination of the first sealing piece and the positioning part is soft sealing, so that the sealing performance is good, and the air tightness of the valve assembly is ensured.

In one embodiment, a fixed block is arranged in the positioning part and fixedly connected with the inner wall of the positioning part, a through hole is formed in the fixed block, and the core rod is arranged in the through hole in a penetrating manner and can move along the axial direction of the fixed block.

The arrangement ensures the track of the axial movement of the core rod and prevents the core rod from shifting in the process of opening and closing the valve assembly.

In one embodiment, one end of the first section, which is far away from the core seat, is provided with a limiting protrusion, an elastic piece is sleeved on the outer periphery side of the first section, one end of the elastic piece is abutted to the fixed block, and the other end of the elastic piece is abutted to the limiting protrusion.

The elastic piece is arranged in such a way that the core bar is always subjected to the elastic force of the elastic piece towards the limiting protrusion under the condition that the core bar is not subjected to external pressure, and the core bar can be always kept tightly attached to the positioning part by means of the elastic force. When the core rod is subjected to external pressure and moves in a direction away from the valve cover, after the channel is opened, the elastic piece can also apply elastic force to the limiting protrusion, so that the core rod returns to the valve closing position.

In one embodiment, a flow channel is formed between the outer wall of the fixed block and the inner wall of the positioning part, a gap is formed between the air charging connector, the positioning part and the core rod, and in the open state of the first valve port, the gap, the flow channel and the first valve port form a channel, and the channel can be used for medium flow.

The arrangement of the valve seat increases the filling efficiency when the medium is supplemented to the refrigerating system through the valve assembly because the flow area of the channel formed by the inner wall of the core seat, the first valve port and the gap is larger.

In one embodiment, the outer wall of the core print seat is provided with a limiting step in limiting connection with an external element.

By the arrangement, the connection between the core seat and the external element is tighter, so that the connection stability of the valve assembly and the external element is enhanced.

In one embodiment, a valve cover is sleeved on the outer peripheral side of the air charging connector and used for sealing the valve assembly, the air charging connector is provided with external threads, the inner wall of the valve cover is provided with internal threads, and the valve cover is connected with the air charging connector through threads; and/or a second sealing piece is arranged between the valve cover and the inflation connector, and the second sealing piece is tightly limited by the inflation connector and the valve cover and realizes soft sealing with the two.

The valve assembly is provided with the valve cover seal except for the seal between the core rod and the core body, the tightness of the valve assembly is guaranteed, and the second sealing piece can further enhance the sealing performance of the valve cover.

The valve assembly comprises a valve body, a valve core and the valve assembly as claimed in any one of claims 1-9, wherein the valve assembly is connected with the valve body, and the valve core is arranged in the valve body and can move along the axial direction of the valve body so as to open and close a stop valve.

Compared with the prior art, the valve assembly provided by the invention has the advantages that the air inflation connector, the positioning part and the core seat are integrally arranged, three elements are not required to be respectively processed, assembly is not required, parts are simplified, and processing cost is reduced; the valve assembly is integrally formed, so that the valve assembly is simple and stable in structure, and an additional sealing piece is not required to be arranged between the positioning part and the core seat, so that the sealing performance of the valve assembly is enhanced; meanwhile, one end of the positioning part does not need to extend into the core seat for connection, so that the flow of medium in the core body is increased, and the filling quantity can be increased.

Drawings

FIG. 1 is a cross-sectional view of a valve assembly provided by the present invention;

FIG. 2 is an exploded view of a valve assembly provided by the present invention;

FIG. 3 is a cross-sectional view of a shut-off valve with a valve assembly installed in accordance with the present invention;

fig. 4 is a cross-sectional exploded view of a shut-off valve with a valve assembly installed in accordance with the present invention.

The symbols in the drawings are as follows:

100. a valve assembly; 10. a core; 11. a positioning part; 111. a second conical surface; 112. a first valve port; 12. a core seat; 121. a limit step; 13. a channel; 14. a fixed block; 15. an inflation joint; 20. a core bar; 21. a first section; 211. a limit protrusion; 212. an elastic member; 22. a second section; 221. a first conical surface; 222. a stem groove; 223. a first seal; 30. a valve cover; 31. a second seal; 200. a stop valve; 40. a valve body; 41. a first opening; 411. a first communication pipe; 42. a second opening; 421. a second communicating pipe; 43. an end cap; 44. a valve seat; 441. a valve seat opening; 442. a step; 50. a valve core; 51. an operation unit; 52. a boss; 521. a groove; 53. and a third seal.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "mounted" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-2, the valve assembly 100 provided by the present invention is applied in a stop valve 200, and functions as a medium supplementing agent, such as a refrigerant supplementing agent, for the stop valve 200.

The valve assembly 100 includes a core 10 and a core rod 20, and the core rod 20 is provided inside the core 10 and is movable in an axial direction of the core 10 to open or close the valve assembly 100.

The core 10 is provided with a first valve port 112, and the core rod 20 is inserted into the core 10 and can move along the axial direction of the core 10, so as to open or close the first valve port 112.

The core 10 comprises an inflation connector 15, a positioning part 11 and a core seat 12, wherein the inflation connector 15, the positioning part 11 and the core seat 12 are integrally arranged, the inflation connector 15 is arranged on one side of the positioning part 11 away from the first valve port 112, the core seat 12 is arranged on one side of the positioning part 11 close to the first valve port 112, and the core seat 12 is used for being fixedly connected with an external element. The three elements are not required to be processed respectively and assembled, so that the processing cost is reduced; in addition, as the valve assembly is integrally formed, the valve assembly is simple and stable in structure, no additional sealing piece is required to be arranged between the positioning part 11 and the core seat 12, and the sealing performance of the valve assembly 100 is enhanced; in addition, one end of the positioning portion 11 does not need to extend into the core holder 12 to be connected, so that the flow rate of the medium in the core 10 is increased, and the filling amount can be increased.

The air-charging connector 15, the positioning part 11 and the core holder 12 are all hollow, a gap is formed between the inner wall of the positioning part 11 and the core rod 20, a channel 13 is formed by the inner wall of the core holder 12, the first valve port 112 and the gap, and the channel 13 is used for medium flow. The larger flow area thus created increases the charging efficiency when replenishing the refrigerant system with medium through the valve assembly 100.

The air inflation connector 15 is located on a side of the positioning portion 11 away from the core print 12, and is capable of being connected with an external element in a mating manner when the air valve assembly 100 is in an air inflation operation.

The positioning part 11 is internally provided with a fixed block 14, and the fixed block 14 is fixedly connected with the inner wall of the positioning part 11 and used for limiting the axial movement of the core rod 20.

Specifically, the fixing block 14 is provided with a through hole, the core rod 20 is inserted into the through hole and can move along the axial direction of the fixing block 14, and the fixing block 14 is fixedly connected with the positioning part 11, so that the axial movement track of the core rod 20 is ensured, and the core rod 20 is prevented from shifting in the movement process of opening and closing the valve assembly 100.

The outer wall of the core print 12 is provided with a limiting step 121 which can be in limiting connection with an external element, and the limiting step 121 can enable the connection between the core print 12 and the external element to be tighter, so that the connection stability of the valve assembly 100 and the external element is enhanced.

The valve assembly 100 further comprises a valve cover 30, the valve cover 30 is sleeved on the outer peripheral side of the core body 10 and is used for sealing the valve assembly 100, in the embodiment, the valve cover 30 is connected with the core body 10 through threads, internal threads are formed on the inner wall of the valve cover 30, external threads are formed on one end, close to the valve cover 30, of the core body 10, and the threaded connection can facilitate the disassembly and assembly between the valve cover 30 and the core body 10; in other embodiments, the valve cover 30 and the core 10 may be configured to be clamped, and the connection between them is only required to be detachably connected, and is not limited to the threaded connection described in the present embodiment.

In order to ensure the sealing performance of the connection between the core 10 and the valve cover 30, a second sealing element 31 is further arranged between the core 10 and the valve cover 30, and the second sealing element 31 is tightly limited by the core 10 and the valve cover 30 and is in soft sealing with the two.

The core rod 20 includes a first section 21 and a second section 22, the first section 21 is disposed near the valve cover 30 for restoring the core rod 20 to the initial position, and the second section 22 is disposed at an end of the first section 21 far from the valve cover 30 for abutting against the core body 10 so as to seal the first valve port 112.

Specifically, one end of the first section 21, which is close to the valve cover 30, is provided with a limiting protrusion 211, an elastic member 212 is sleeved on the outer periphery side of the first section 21, one end of the elastic member 212, which is close to the valve cover 30, is abutted to the limiting protrusion 211, and the other end is abutted to the fixed block 14. In this way, the elastic member 212 can always receive the elastic force of the elastic member 212 toward the limit projection 211 without receiving the external pressure, and by means of the elastic force, the core rod 20 can always be held in guide engagement with the fixing block 14. When the stem 20 is subjected to external pressure and moves in a direction away from the valve cover 30, the elastic member 212 can also exert elastic force on the limit protrusion 211 after opening the passage 13, so that the stem 20 returns to the valve closing position. The elastic member 212 may be an elastic member having elasticity, such as an elastic member, a bellows, or the like.

The side of the second section 22 facing the positioning portion 11 is provided with a first conical surface 221, the inner wall of the first valve port 112 is provided with a second conical surface 111, and when the valve assembly 100 is in a valve closing state, the first conical surface 221 is abutted against the second conical surface 111, and the first conical surface 221 and the second conical surface 111 can realize hard sealing to seal the first valve port 112.

Further, first tapered surface 221 forms an angle α with the axis of core rod 20 that is smaller than angle β formed by second tapered surface 111 with the axis of core rod 20. So configured, when stem 20 is in the closed position, first tapered surface 221 forms a line seal with second tapered surface 111, enhancing the bond therebetween, thereby preventing leakage of the medium.

The outer peripheral side of the second section 22 is provided with a core rod groove 222, the core rod groove 222 is embedded with a first sealing member 223, and when the second section 22 is abutted against the positioning portion 11, the first sealing member 223 can form a soft seal with the second conical surface 111, so that the first valve port 112 is blocked. The soft seal of the first sealing member 223 with the second conical surface 111 and the hard seal of the first conical surface 221 with the second conical surface 111 cooperate to form a double seal, thereby ensuring the sealing performance of the valve assembly 100.

In addition, in the present embodiment, the valve assembly 100 is made of stainless steel, and because the stainless steel is harder, the positioning portion 11 and the core seat 12 are separately arranged, and no additional screw thread is required to be arranged to connect the positioning portion and the core seat, so that the processing difficulty is reduced. In other embodiments, the valve assembly 100 may be made of brass or copper, and the valve assembly 100 is made of a stainless steel material, which is not limited to the embodiment.

During the operation of the valve assembly 100, when the medium is required to be replenished into the refrigerating system, the valve cover 30 is unscrewed, and then the core rod 20 is extruded towards one end far away from the valve cover 30, so that the core rod 20 moves towards the direction far away from the valve cover 30, meanwhile, the first conical surface 221 and the first sealing piece 223 are separated from the positioning part 11, the channel 13 is opened, and the medium is filled into the refrigerating system through the channel 13; when the filling operation is completed, only the force pressing the stem 20 needs to be removed, the elastic member 212 returns the stem 20 to the valve closing position by abutting against the limit projection 211, and the first tapered surface 221 and the first seal member 223 are again attached to the positioning portion 11, thereby closing the valve assembly 100.

Referring to fig. 3 to 4, the present invention further provides a stop valve 200, where the stop valve 200 is installed in a refrigeration system to stop a medium flowing in a pipeline, and the stop valve 200 includes the valve assembly 100 described above, and the valve assembly 100 is used for supplementing the medium in the refrigeration system.

The stop valve 200 further includes a valve body 40 and a valve core 50, the valve core 50 is connected to the valve body 40, the interior of the valve body 40 is hollow for accommodating components such as the valve core 50, and at least a part of the valve core 50 is provided in the interior of the valve body 40 and is movable in the axial direction of the valve body 40.

The valve body 40 is provided with a first opening 41 and a second opening 42, in this embodiment, the first opening 41 is opened at the lower side of the valve body 40, the second opening 42 is opened at the right side of the valve body 40, in other embodiments, the first opening 41 and the second opening 42 may be opened at other positions of the valve body 40, and only the flow of the medium needs to be realized, which is not limited to the positions set in this embodiment.

One side of the first opening 41 away from the valve body 40 is connected with a first communication pipe 411, the first opening 41 is communicated with the outside through the first communication pipe 411, one side of the second opening 42 away from the valve body 40 is connected with a second communication pipe 421, and the second opening 42 is communicated with the outside through the second communication pipe 421.

In the present embodiment, the first communication pipe 411 and the second communication pipe 421 are made of stainless steel, thereby reducing the cost. In other embodiments, the first communication pipe 411 and the second communication pipe 421 may be made of red copper.

The valve body 40 further comprises an end cover 43 and a valve seat 44, wherein the end cover 43 is positioned at the top end of the valve body 40 and cooperates with the valve core 50 to seal the valve body 40, so that foreign matters such as external dust and powder are prevented from entering the valve body 40, the tightness of the switching valve of the stop valve 200 and the purity of media entering the valve body 40 are prevented from being influenced, and other relevant functions of the stop valve 200 are prevented from being realized. The valve seat 44 is disposed in the first opening 41 for abutting engagement with the valve element 50 to achieve communication or shut-off of the interior of the valve body 40.

Alternatively, the end cover 43 may be disposed inside the valve body 40, that is, the outer peripheral side of the end cover 43 abuts against the inner peripheral side of the valve body 40, and the inner peripheral side of the end cover 43 abuts against the outer peripheral side of the valve core 50, so that the end cover 43 and the valve core 50 cooperate to seal the valve body 40. The position of the end cap 43 is not limited to the one described in the present embodiment, and only needs to be able to achieve the above-described function.

The valve seat 44 is provided with a valve seat opening 441, and the valve seat opening 441 communicates with the first opening 41 and the second opening 42 to form the medium inflow or outflow passage 13. Preferably, in the present embodiment, the valve seat 44 is provided separately from the valve body 40 to reduce the difficulty of processing. Alternatively, in other embodiments, the valve seat 44 may be formed directly from the valve body 40.

One section of the first communication pipe 411 extends into the valve seat 44, and the outer wall of the first communication pipe 411 is fixedly connected with the inner wall of the valve seat 44 through a brazing process, so that the firmness of brazing and welding is enhanced.

The internal diameter of the valve seat 44 near one end of the valve core 50 is smaller than the internal diameter of the valve seat 44 far away from one end of the valve core 50, so that a step 442 is formed, one end of the first communication pipe 411 is abutted on the step 442, the first communication pipe 411 is limited through the structure of the valve seat 44, the limiting strength is high, and the first communication pipe 411 does not need to be connected with an additional structure, so that the processing cost is reduced.

In addition, the valve body 40 is made of stainless steel material, thereby reducing costs.

The valve element 50 is provided with an operation portion 51. The operation portion 51 is provided in a hollow structure with an open upper end, and a plurality of flat surfaces are uniformly distributed on the inner surface of the operation portion 51 at intervals, so that the operation portion can be adapted to tools such as an allen wrench. In other embodiments, the planes of the inner surface of the operation portion 51 may be arranged to be uniformly distributed at non-intervals so as to be suitable for irregularly shaped wrenches.

The valve element 50 is driven by the operation portion 51 and rotates in synchronization with the operation portion 51. During operation, the operating portion 51 is operated to rotate by an external machine or tool, so as to perform an axial lifting movement by being engaged with the screw thread between the valve bodies 40, thereby driving the valve element 50 to perform an axial movement of the valve element 50.

The end of the valve core 50 near the valve port is provided with a boss 52 and a groove 521. The boss 52 is cylindrical, has one end connected to the valve body 50 and the other end extending toward the valve seat port 441 for guiding insertion of the valve body 50 into the valve seat port 441. The groove 521 is a circular groove 521, which is disposed around the boss 52, and the notch of the groove 521 is opened toward the valve seat 44.

The groove 521 is provided with a third sealing member 53, and the third sealing member 53 is also annular and embedded in the groove 521 to be in interference fit with the groove 521. In the closed state of the shutoff valve 200, the third seal 53 can abut against the valve seat 44 and can seal the valve seat port 441.

When the shut-off valve 200 is closed, the valve core 50 moves toward the valve seat port 441, and finally the third sealing member 53 abuts against the valve seat 44, so as to isolate the first opening 41 and the first communication pipe 411 from the interior of the valve body 40. Preferably, the third sealing member 53 is made of red copper material to ensure sealing performance between the third sealing member 53 and the valve seat port 441. In other embodiments, the third sealing member 53 may be made of a material such as hard plastic, which can ensure sealing performance.

The invention also provides a refrigeration system, which comprises the stop valve 200, wherein the stop valve 200 is arranged in a medium passage of the refrigeration system to control the interception and circulation of the passage and is used for supplementing the medium to the refrigeration system.

In the working process of the stop valve 200 of the present embodiment, when the stop valve 200 needs to be closed, the operation part 51 at the top of the stop valve 200 is screwed, the operation part 51 rotates synchronously with the valve core 50, and the valve core 50 is driven to move axially by the threaded engagement with the valve body 40, so that the boss 52 at the bottom end of the valve core 50 is inserted into the valve seat port 441, the third sealing member 53 abuts against the valve seat 44, and the first communication pipe 411 is sealed, thereby realizing the cutting-off between the second communication pipe 421 and the first communication pipe 411.

Compared with the prior art, the valve assembly 100 provided by the invention has the advantages that the air inflation connector 15, the positioning part 11 and the core print seat 12 are integrally arranged, three elements are not required to be respectively processed, assembly is not required, and the processing cost is reduced; in addition, as the valve assembly is integrally formed, the valve assembly is simple and stable in structure, no additional sealing piece is required to be arranged between the positioning part 11 and the core seat 12, and the sealing performance of the valve assembly 100 is enhanced; meanwhile, one end of the positioning part does not need to extend into the core seat for connection, so that the flow of medium in the core body is increased, and the filling quantity can be increased.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. A valve assembly, characterized by comprising a core body (10) and a core rod (20), wherein the core rod (20) is arranged in the core body (10), a first valve port (112) is formed on the inner wall of the core body (10), and the core rod (20) can move along the axial direction of the core body (10) to open/close the first valve port (112); the core body (10) comprises an inflation connector (15), a positioning part (11) and a core seat (12), wherein the inflation connector (15), the positioning part (11) and the core seat (12) are integrally arranged, the inflation connector (15) is arranged on one side, far away from the first valve port (112), of the positioning part (11), the core seat (12) is arranged on one side, close to the first valve port (112), of the positioning part (11), and the core seat (12) is used for being fixedly connected with an external element.

2. The valve assembly according to claim 1, wherein the inflation connector (15), the positioning portion (11) and the core holder (12) are all hollow, and the core body (10) is formed with the first valve port (112) on an inner wall between the positioning portion (11) and the core holder (12); the core bar (20) comprises a first section (21) and a second section (22) which are connected with each other, the first section (21) is at least partially penetrated in the positioning part (11), and the second section (22) is at least partially positioned in the core seat (12).

3. A valve assembly according to claim 2, wherein the side of the second section (22) facing the positioning portion (11) has a first conical surface (221), the inner wall of the first valve port (112) has a second conical surface (111), the first conical surface (221) can abut against the second conical surface (111), and an angle α between the first conical surface (221) and the axis of the core rod (20) is smaller than an angle β between the second conical surface (111) and the axis of the core rod (20).

4. The valve assembly according to claim 2, wherein a stem groove (222) is provided on the outer peripheral side of the second section (22), a first seal member (223) is provided in the stem groove (222), and the first seal member (223) can abut against the first valve port (112) to block the first valve port (112).

5. The valve assembly according to claim 2, wherein a fixed block (14) is disposed in the positioning portion (11), the fixed block (14) is fixedly connected with an inner wall of the positioning portion (11), the fixed block (14) is provided with a through hole, and the core rod (20) is disposed in the through hole in a penetrating manner and can move along an axial direction of the fixed block (14).

6. A valve assembly according to claim 5, wherein one end of the first section (21) away from the core holder (12) is provided with a limiting protrusion (211), an elastic member (212) is sleeved on the outer periphery side of the first section (21), one end of the elastic member (212) is abutted to the fixed block (14), and the other end is abutted to the limiting protrusion (211).

7. The valve assembly according to claim 5, characterized in that a flow channel is provided between the outer wall of the fixed block (14) and the inner wall of the positioning part (11), a gap is provided between the air charging connector (15), the positioning part (11) and the core rod (20), and in the open state of the first valve port (112), the gap, the flow channel and the first valve port (112) form a channel, which is capable of flowing a medium.

8. A valve assembly according to claim 2, characterized in that the outer wall of the cartridge (12) is provided with a stop step (121) for a stop connection with an external element.

9. A valve assembly according to claim 1, characterized in that a valve cover (30) is sleeved on the outer peripheral side of the air charging connector (15) and used for sealing the valve assembly, the air charging connector (15) is provided with external threads, the inner wall of the valve cover (30) is provided with internal threads, and the valve cover (30) is connected with the air charging connector (15) through threads; and/or a second sealing piece (31) is arranged between the valve cover (30) and the air inflation joint (15), and the second sealing piece (31) is tightly limited by the air inflation joint (15) and the valve cover (30) and realizes soft sealing with the two.

10. A shut-off valve comprising a valve body (40), a valve core (50) and a valve assembly according to any one of claims 1-9, said valve assembly being connected to said valve body (40), said valve core (50) being arranged in said valve body (40) and being movable in an axial direction of said valve body (40) for opening and closing the shut-off valve.

Images