CN218760339U - Check valve, air compressor machine and gas-using equipment - Google Patents

Abstract

The application discloses a one-way valve, an air compressor and air using equipment, wherein the one-way valve comprises a valve shell, a valve core and a sealing gasket, the valve shell comprises a first valve shell and a second valve shell which are detachable, the first valve shell is provided with an air inlet, the second valve shell is provided with an air outlet, a channel is formed at the joint of the first valve shell and the second valve shell and is communicated with the air inlet and the air outlet, and the first valve shell is provided with a butt joint surface comprising an inner annular surface and an outer annular surface; the valve core is movably positioned in the channel; the sealing gasket comprises a first gasket and a second gasket which are integrally formed, the second gasket is arranged on the first gasket in a surrounding mode, the second gasket is embedded between the second valve shell and the outer annular surface, the first gasket is located on the inner annular surface, the valve core is abutted to the first gasket to block the channel, or the valve core and the first gasket are spaced to form a circulation gap. Under the effect of the sealing gasket, the sealing connection between the first valve shell and the second valve shell can be realized, the valve core and the inner annular surface are sealed, and the sealing performance is improved.

Description

Check valve, air compressor machine and gas-using equipment

Technical Field

The embodiment of the utility model provides a relate to the switch valve field, especially relate to a check valve, air compressor machine and gas appliances.

Background

Check valves, also known as check valves, are used in hydraulic systems to prevent reverse flow of oil or in pneumatic systems to prevent reverse flow of compressed air. In a hydraulic system or a pneumatic system, the one-way valve is used for avoiding the condition of reverse flow, and the sealing performance of the one-way valve influences the normal operation of a hydraulic circuit and a pneumatic circuit. One-way valves typically include a valve housing and a valve spool mounted within the valve housing.

At present, the sealing assembly of the one-way valve is complex, and the sealing effect is poor.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, an embodiment of the utility model provides a.

The embodiment of the utility model provides a solve its technical problem and adopt following technical scheme:

a one-way valve comprises a valve shell, a valve core and a sealing gasket, wherein the valve shell comprises a first valve shell and a second valve shell which are detachable, the first valve shell is provided with an air inlet, the second valve shell is provided with an air outlet, a channel is formed at the joint of the first valve shell and the second valve shell and is communicated with the air inlet and the air outlet, the first valve shell is provided with an abutting surface surrounding the air inlet, and the abutting surface is provided with an inner annular surface and an outer annular surface; the valve core is movably arranged in the channel; the sealing gasket comprises a first gasket and a second gasket which are integrally formed, the second gasket is arranged on the first gasket in a surrounding mode, the second gasket is embedded between the second valve shell and the outer annular surface, the first gasket is located on the inner annular surface, the valve core is abutted to the first gasket to block the channel, or the valve core and the first gasket are spaced to form a circulation gap.

The embodiment of the utility model provides a solve its technical problem and still adopt following technical scheme:

a gas-using equipment comprises the air compressor.

The embodiment of the utility model provides a beneficial effect is: therefore, the sealing convex part and the first gasket on the inner annular surface of the second valve shell can be in better close fit, so that better sealing effect is realized. Simultaneously, set up the second packing ring between second valve casing and outer annular, not only can utilize the centre gripping of two valve casings to fix the stable fixing of sealed pad like this, can improve the leakproofness of first valve casing and second valve casing junction moreover, avoid gas or liquid to leak to external through the clearance of first valve casing and second valve casing junction. Meanwhile, the sealing gasket can also play a role in shock absorption, and the sealing convex part is prevented from directly impacting the inner ring surface. First packing ring sets up with second packing ring is integrative, is favorable to reducing the accessory quantity and the assemble duration of assembly check valve, has improved check valve's assembly efficiency.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

FIG. 1 is a schematic view of a one-way valve according to one embodiment of the present application;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is an exploded view of the structure of FIG. 1;

FIG. 4 is a schematic view of the second valve housing of FIG. 3;

FIG. 5 is a cross-sectional view of FIG. 1, with arrows showing the flow of gas;

fig. 6 is a schematic structural view of an air compressor according to another embodiment of the present application;

FIG. 7 is a cross-sectional view of FIG. 6;

FIG. 8 is an exploded view of a portion of the structure of FIG. 6;

fig. 9 is a schematic view of another perspective of the retaining ring of fig. 8.

Reference numerals:

100. a one-way valve; 110. a valve housing; 120. a valve core; 130. a gasket; 140. a reset member; 1101. an air inlet; 1102. an air outlet; 1103. a channel; 111. a first valve housing; 112. a second valve housing; 1111. an abutting surface; 1111a, an outer ring surface; 1111b, an inner ring surface; 121. a valve body; 122. a sealing protrusion; 131. a first gasket; 132. a second gasket; 1122. an annular wall; 1121. a groove; 11221. a flow-through groove; 1123. a containing groove; 1112. a first raised edge portion; 1114. a first connection portion; 112a, a second ledge; 112b, an intermediate portion; 112c, a second connecting part; 600. an air compressor; 200. a main body; 201. an air outlet; 202. an air inlet; 210. a drive device; 220. a piston assembly; 230. a housing; 231. a first cavity; 232. a second cavity; 221. a connecting rod; 222. a piston head; 223. an elastic baffle plate; 300. a fixing ring; 301. a recessed portion; 400. an elastic washer; 203. an accommodating groove; 500. a connecting member.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "upper", "lower", "inner", "outer", "vertical", "horizontal", and the like as used herein are used in the description to indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1-2, one embodiment of the present application provides a check valve 100 including a valve housing 110, a valve core 120, and a gasket 130. Wherein, valve housing 110 is provided with inlet hole 1101, outlet hole 1102 and channel 1103, and channel 1103 communicates between inlet hole 1101 and outlet hole 1102. The valve element 120 is movably disposed in the passage 1103 and the gasket 130 is disposed in the valve housing 110.

As shown in fig. 2, the valve spool 120 may reciprocate in a center direction X of the valve housing 110.

When the valve element 120 abuts against the gasket 130, the valve element 120 blocks the passage 1103, and the check valve 100 is in a closed state. When the valve core 120 is spaced apart from the gasket 130 to form a flow gap, and the check valve 100 is in an open state, gas can enter the valve housing 110 through the gas inlet hole 1101, and can be output from the gas outlet hole 1102 through the passage 1103.

Referring to fig. 3, in the present embodiment, the valve housing 110 includes a first valve housing 111 and a second valve housing 112, the first valve housing 111 is detachably connected to the second valve housing 112, the first valve housing 111 has an air inlet hole 1101, the second valve housing 112 has an air outlet hole 1102, and a channel 1103 is formed at a connection portion of the first valve housing 111 and the second valve housing 112. Wherein the first valve housing 111 has an abutment surface 1111, the abutment surface 1111 is disposed around the intake hole 1101, and the abutment surface 1111 includes an outer annular surface 1111a and an inner annular surface 1111b.

The outer annular surface 1111a is spaced apart from the second housing 112, and the inner annular surface 1111b is located in the passage 1103.

The valve body 121 and the sealing protrusion 122 are disposed on the valve body 121, and the sealing protrusion 122 is disposed around the valve body 121, in other words, the sealing protrusion 122 protrudes from the outer circumferential surface of the valve body 121. One end of the valve main body 121 is embedded in the air inlet hole 1101 and is spaced from the hole wall of the air inlet hole 1101, and the other end of the valve main body 121 is embedded in the air outlet hole 1102 and is spaced from the hole wall of the air outlet hole 1102. Thus, when the valve core 120 moves relative to the valve housing 110, the part of the valve main body 121 located in the air inlet hole 1101 and the air outlet hole 1102 can play a role in guiding, the valve core 120 is prevented from shifting left and right in the moving process, the stable movement of the valve core 120 is guaranteed, meanwhile, one end of the valve main body 121 is arranged at an interval with the hole wall of the air inlet hole 1101, the other end of the valve main body is arranged at an interval with the hole wall of the air outlet hole 1102, and therefore when the valve main body 121 is in an open state, air flow can be guaranteed to normally circulate.

It should be understood that the shape of the sealing protrusion 122 can be set as desired, as long as communication between the blocking passage 1103 and the intake hole 1101 is achieved. In some embodiments, the sealing protrusion 122 is conical in shape, and the outer diameter dimension of the sealing protrusion 122 on the side closer to the gas inlet hole 1101 is greater than the outer diameter dimension of the sealing protrusion 122 on the side away from the gas inlet hole 1101.

When the sealing protrusion 122 abuts against the gasket 130, the gas cannot directly enter the passage 1103 due to the obstruction of the sealing protrusion 122; when the seal protrusion 122 is separated from the gasket 130 and a flow gap is formed, gas enters the passage 1103 through the flow gap and finally exits from the gas outlet hole 1102.

In this embodiment, the gasket 130 includes a first gasket 131 and a second gasket 132 integrally formed, the second gasket 132 is disposed around the first gasket 131, the second gasket 132 is embedded between the second valve casing 112 and the outer annular surface 1111a, and the first gasket 131 is disposed on the inner annular surface 1111b.

In this way, the sealing protrusion 122 is in better fit engagement with the first gasket 131 on the inner annular surface 1111b of the second housing 112 to achieve a better sealing effect. Meanwhile, the second gasket 132 is disposed between the second valve housing 112 and the outer annular surface 1111a, so that the gasket 130 is stably fixed, and the sealing property at the joint of the first valve housing 111 and the second valve housing 112 is improved, thereby preventing gas or liquid from leaking to the outside through the gap at the joint of the first valve housing 111 and the second valve housing 112. Meanwhile, the gasket 130 can also play a role in shock absorption, so as to prevent the sealing protrusion 122 from directly impacting the inner annular surface 1111b. In this embodiment, the first gasket 131 and the second gasket 132 are integrally disposed, which is beneficial to reducing the number of accessories and the assembly time for assembling the check valve 100, and improves the assembly efficiency of the check valve 100.

In some embodiments, the inner edge of the first gasket 131 and the inner annular surface 1111b are spaced apart from each other around a portion of the intake hole 1101, such that when the valve element 120 abuts against the first gasket 131, the valve element 120 does not abut directly against the inner annular surface 1111b around the edge of the intake hole 1101, and therefore, the inner annular surface 1111b forms a pre-intake channel (not shown) around the edge of the intake hole 1101 and the valve element 120, such that an air flow can be pre-introduced into the pre-intake channel from the intake hole 1101, and when the valve element 120 is initially opened, the air flow can rapidly enter the channel 1103 through the pre-intake channel.

As shown in fig. 3 to 4, in some embodiments, an end surface of the second valve housing 112 facing the outer annular surface 1111a is provided with a groove 1121, a side wall of the groove 1121 is provided with threads, the gasket 130 is embedded in the groove 1121, the abutting surface 1111 is embedded in the groove 1121, a portion of the first valve housing 111 located in the groove 1121 is provided with threads, and the first valve housing 111 is threadedly coupled to the side wall of the groove 1121, so that the first valve housing 111 and the second valve housing 112 can be detachably coupled.

It should be understood that the connection between the first valve housing 111 and the second valve housing 112 may be realized by other means besides the above-mentioned screw connection, as long as the connection between the first valve housing 111 and the second valve housing 112 can be realized. In some embodiments, the first valve housing 111 and the second valve housing 112 are connected by a snap connection, and at this time, one of the first valve housing 111 and the second valve housing 112 is provided with a claw (not shown), and the claw is directly engaged with the other. In some embodiments, the first valve housing 111 and the second valve housing 112 are bonded together by a sealant.

In some embodiments, the second valve housing 112 has an annular wall 1122 within the channel 1103, and at least a portion of the annular wall 1122 has a gradually increasing caliber size from the outlet aperture 1102 toward the inlet aperture 1101, such that the annular wall 1122 generally forms a funnel-like configuration. Thus, when a flow gap is formed between the valve element 120 and the valve housing 110, gas flows into the passage 1103 through the flow gap and fills the space of the passage 1103, and the diameter of the annular wall 1122 at the portion close to the first valve housing 111 is larger than the diameter of the portion of the annular wall 1122 close to the gas outlet 1102, so that the gas is gradually gathered toward the gas outlet 1102.

In some embodiments, the volume in the passage 1103 is greater than the volume of the portion of the second housing 112 having the outlet hole 1102, so as to ensure that the gas is discharged as stably as possible when the gas is discharged through the outlet hole 1102.

As shown in fig. 4, in some embodiments, the annular wall 1122 is provided with flow-through grooves 11221, one end of the flow-through grooves 11221 extends to the position of the air outlet hole 1102, the other end of the flow-through grooves 11221 communicates with the air inlet hole 1101 through a flow-through gap, the number of the flow-through grooves 11221 may be plural, and a plurality of the flow-through grooves 11221 may be provided at intervals around the circumference of the annular wall 1122. By providing the flow-through groove 11221, it is advantageous to increase the cross-sectional area through which the gas flows, ensuring the flow rate of the gas flow.

In some embodiments, the shape of the sealing protrusion 122 is substantially conical, a gap is formed between the sealing protrusion 122 and the annular wall 1122, the gap is uniformly arranged from the air outlet hole 1102 to the direction of the air inlet hole 1101, that is, the distance between the sealing protrusion 122 and the annular wall 1122 is the same from one side close to the air inlet hole 1101 to the direction of the air outlet hole 1102, so that the air is guided to converge toward the air outlet hole 1102 and is uniformly discharged toward the air outlet hole 1102, and in addition, the air flow can be ensured to smoothly circulate when passing through the gap, thereby effectively ensuring that the flow rate of the air flow discharged from the air outlet hole 1102 is uniform.

In some embodiments, referring to fig. 5, the check valve 100 further includes a reset element 140, and the reset element 140 is disposed between the second housing 112 and the valve core 120, such that the valve core 120 abuts against the inner annular surface 1111b. The reset element 140 may be a spring, an elastic silica gel, or other elastic elements as long as it can reset the valve core 120. In the embodiment, the restoring element 140 is a spring, the spring is sleeved on the valve body 121 and located between the sealing protrusion 122 and the second valve casing 112, and the spring applies a force to the sealing protrusion 122, so that the sealing protrusion 122 is tightly abutted to the inner annular surface 1111b. When the pressure of the air pressure entering from the air inlet hole 1101 is higher, the air flow generates a higher thrust to push the sealing protrusion 122 to move towards the air outlet hole 1102, at this time, the sealing protrusion 122 and the inner ring surface 1111b are spaced apart from each other to form a flow gap, and the air enters the channel 1103 through the flow gap; when the intake air stops or the flow of the intake air is small, the spring returns, and therefore, the spring pushes the seal protrusion 122 to move toward the inner ring surface 1111b during the return process, and when the seal protrusion 122 abuts against the inner ring surface 1111b, the valve body 120 closes the passage through which the gas flows.

In some embodiments, the second valve housing 112 is provided with a receiving groove 1123, the receiving groove 1123 is located at one end of the annular wall 1122 close to the air outlet hole 1102, the receiving groove 1123 is communicated with the air outlet hole 1102, the receiving groove 1123 is used for receiving the resetting piece 140, so that the resetting piece 140 can be better positioned, and the resetting piece 140 can utilize a partial space of the second valve housing 112 in the axial direction, so that the assembly length of the whole check valve 100 can be reduced.

Referring to fig. 3 again, in some embodiments, the first valve housing 111 includes a first protruding edge 1112 and a first connection portion 1114 that are integrally formed, and the air inlet hole 1101 penetrates the first protruding edge 1112 and the first connection portion 1114. Wherein, the outer circumference of the first convex edge 1112 is provided with a screw thread. In order to facilitate understanding of the relationship between the outer peripheral dimension of the first protruding edge 1112 and the outer peripheral dimension of the first connecting portion 1114, the first protruding edge 1112 and the first connecting portion 1114 are both in a shape of a circular tube, the outer peripheral dimension of the first protruding edge 1112 is the outer diameter of the first protruding edge 1112, the outer peripheral dimension of the first connecting portion 1114 is the outer diameter of the first connecting portion 1114, and the outer diameter of the first protruding edge 1112 is larger than the outer diameter of the first connecting portion 1114. The first connection portion 1114 may be used to connect with an air outlet of another structure.

Further, the second valve housing 112 includes a second flange portion 112a, an intermediate portion 112b, and a second connecting portion 112c connected in this order, an inner portion of the second valve housing 112 is hollowed out to form the air outlet hole 1102 and the passage 1103, an outer peripheral dimension of the second flange portion 112a is larger than an outer peripheral dimension of the intermediate portion 112b, and an outer peripheral dimension of the intermediate portion 112b is larger than an outer peripheral dimension of the second connecting portion 112 c. The inner wall surface of the second flange 112a is provided with a thread for matching with the thread on the outer peripheral surface of the first flange 1112 to realize a threaded connection. The second connecting portion 112c is used for connecting with an intake hole of another structure.

In the check valve 100 according to the embodiment of the present application, the sealing protrusion 122 is in better fit with the first gasket 131 on the inner annular surface 1111b of the second housing 112, so as to achieve a better sealing effect. Meanwhile, the second gasket 132 is disposed between the second valve housing 112 and the outer annular surface 1111a, so that the gasket 130 is stably fixed, and the sealing property at the joint of the first valve housing 111 and the second valve housing 112 is improved, thereby preventing gas or liquid from leaking to the outside through the gap at the joint of the first valve housing 111 and the second valve housing 112. Meanwhile, the gasket 130 can also play a role in shock absorption, so as to prevent the sealing protrusion 122 from directly impacting the inner annular surface 1111b. In this embodiment, the first gasket 131 and the second gasket 132 are integrally disposed, which is beneficial to reducing the number of accessories and the assembly time for assembling the check valve 100, and improves the assembly efficiency of the check valve 100. .

As shown in fig. 6, an air compressor 600 provided by another embodiment of the present application includes a main body 200 and the check valve 100 in the above embodiments, the main body 200 is provided with an air outlet 201, the check valve 100 is detachably mounted on the main body 200, and the air outlet 201 is communicated with an air inlet 1101. Thus, the gas generated from the main body 200 is supplied to the external connected device through the outlet hole 1102 of the check valve 100, and the check valve 100 prevents the gas from flowing backwards.

Referring to fig. 7, in some embodiments, the main body 200 includes a driving device 210, a piston assembly 220 and a housing 230, the piston assembly 220 is connected to the driving device 210, the housing 230 defines a first cavity 231 and a second cavity 232 that are communicated with each other, the first cavity 231 is used for accommodating the driving device 210, the second cavity 232 is used for accommodating the piston assembly 220, and the piston assembly 220 divides the second cavity 232 into a first chamber and a second chamber. The driving device 210 drives the piston assembly 220 to reciprocate, so that the air in the second chamber is conveyed to the air outlet 201 and conveyed to the equipment needing air through the one-way valve 100. In this embodiment, the housing 230 has an air inlet 202 in communication with the second cavity 232, the air inlet 202 for supplying air to the first cavity.

In some embodiments, the piston assembly 220 includes a connecting rod 221, a piston head 222, and a flexible flap 223 disposed on the piston head 222, the piston head 222 is provided with a through hole communicating the first chamber and the second chamber, one end of the flexible flap 223 is fixed on the piston head 222, and the other end of the flexible flap 223 is used for shielding the through hole. When the driving device 210 drives the piston head 222 to move in a direction compressing the space of the second chamber, the air in the second chamber pushes the elastic flap 223 to enter the first chamber, thereby replenishing the air in the first chamber. When the driving device 210 drives the piston head 222 to move towards the direction of compressing the first chamber space, the elastic baffle 223 shields the through hole, and the air moves towards the air outlet 201 and is output through the one-way valve 100. In some embodiments, the driving device 210 is a brushless motor.

As shown in fig. 8, in some embodiments, the air compressor 600 further includes a fixing ring 300, the fixing ring 300 is disposed around the outer circumference of the second valve housing 112, and the fixing ring 300 is detachably connected to the main body 200. When the fixing ring 300 is installed on the main body 200, a retaining gap is formed between the fixing ring 300 and the main body 200, so that the second valve casing 112 can be partially embedded in the retaining gap to improve the connection between the check valve 100 and the main body 200. Further, as shown in fig. 9, a side portion of the fixing ring 300 facing the air outlet 201 is recessed and forms a recessed portion 301, and the recessed portion 301 accommodates a portion of the second valve housing 112, which helps to achieve quick positioning and mounting of the fixing ring 300 to the second valve housing 112.

It is understood that the fixing ring 300 can be detachably connected to the main body 200 by screws or bolts, or by hooks, or by other methods.

In some embodiments, the air compressor 600 further includes a resilient gasket 400, the main body 200 is provided with a receiving groove 203, the air outlet 201 is located at the bottom of the receiving groove 203, the resilient gasket 400 is disposed around the air outlet 201, and the second valve housing 112 is at least partially embedded in the receiving groove 203. Thus, under the action of the elastic gasket 400, the sealing performance between the check valve 100 and the main body 200 can be improved, and the gas generated by the main body 200 is prevented from leaking to the outside through the installation gap between the check valve 100 and the gas outlet 201. Further, the first connection portion 1114 of the first valve housing 111 is at least partially inserted into the gas outlet 201, so that the gas generated from the main body 200 can better enter the gas inlet hole 1101.

In some embodiments, air compressor 600 further includes a connector 500, and connectors 500 are connected to valve housing 110 and main body 200 at respective ends. The elastic washer 400 is pressed between the bottom of the receiving groove 203 and the second valve housing 112 by the locking force of the connection member 500.

The air compressor machine 600 of this application embodiment adopts check valve 100 in the above-mentioned embodiment, can reduce the risk of gas refluence, and simultaneously, air compressor machine 600 sets up solid fixed ring 300, helps realizing that the fastening of check valve 100 is installed in main part 200, avoids breaking away from main part 200 at the in-process check valve 100 of transportation air compressor machine, has improved air compressor machine 600's stability.

The gas equipment that this application another embodiment provided, including the air compressor machine 600 in above-mentioned embodiment, the gas equipment can be for breathing machine, aerobic machine or massage equipment etc..

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A check valve, comprising:

the valve shell comprises a first valve shell and a second valve shell which are detachable, the first valve shell is provided with an air inlet, the second valve shell is provided with an air outlet, a channel is formed at the joint of the first valve shell and the second valve shell and is communicated with the air inlet and the air outlet, the first valve shell is provided with an abutting surface surrounding the air inlet, and the abutting surface comprises an inner annular surface and an outer annular surface;

the valve core is movably arranged in the channel; and

the sealing gasket comprises a first gasket and a second gasket which are integrally formed, the second gasket is arranged on the first gasket in a surrounding mode, the second gasket is embedded between the second valve shell and the outer annular surface, the first gasket is located on the inner annular surface, the valve core is abutted against the first gasket to block the channel, or the valve core and the first gasket are spaced to form a circulation gap.

2. The check valve as in claim 1, wherein an end surface of said second valve housing facing said outer annular surface is provided with a groove, said packing is fitted in said groove, said abutting surface is fitted in said groove, and said first valve housing is screw-coupled to a side wall of said groove; and/or the presence of a gas in the gas,

the inner edge of the first gasket and the edge of the inner ring surface surrounding the air inlet hole are arranged at intervals, so that when the valve core abuts against the first gasket, the edge of the inner ring surface surrounding the air inlet hole and the valve core form a pre-air inlet channel at intervals.

3. The check valve as in claim 1, wherein said second housing has an annular wall within said passage, at least a portion of said annular wall having a caliber that increases in size from said outlet aperture toward said inlet aperture.

4. A check valve as claimed in claim 3, wherein said annular wall is provided with a flow through groove, one end of said flow through groove extending to the position of said air outlet aperture and the other end communicating with said air inlet aperture through said flow through gap.

5. The check valve as claimed in claim 3 or 4, wherein the valve core comprises a valve main body and a sealing convex part, the sealing convex part is arranged around the periphery of the valve main body, a gap is formed between the sealing convex part and the annular wall, and the gap is uniformly arranged from the air outlet to the air inlet; and/or the presence of a gas in the gas,

one end of the valve main body is embedded in the air inlet hole and is spaced from the hole wall of the air inlet hole, and the other end of the valve main body is embedded in the air outlet hole and is spaced from the hole wall of the air outlet hole.

6. The one-way valve of any one of claims 1 to 4, comprising a reset member disposed between the second valve housing and the valve spool to urge the valve spool against the inner annular surface.

7. An air compressor machine, its characterized in that includes:

a main body provided with an air outlet;

a check valve as claimed in any one of claims 1 to 6, which is removably mounted to the body, the inlet aperture communicating with the outlet aperture.

8. The air compressor according to claim 7, wherein the air compressor includes a fixing ring disposed around an outer periphery of the second valve casing, a retaining gap is formed between the fixing ring and the main body in the installed state, the second valve casing is partially embedded in the retaining gap, and the fixing ring is detachably connected to the main body.

9. The air compressor as claimed in claim 7, wherein the main body defines a receiving groove, the air outlet is disposed at a bottom of the receiving groove, the air compressor further includes a resilient gasket disposed at the bottom of the receiving groove, the resilient gasket is disposed around the air outlet, the second valve casing is at least partially embedded in the receiving groove, the air compressor further includes a connecting member respectively connecting the valve casing and the main body, so that the resilient gasket is tightly pressed between the bottom of the receiving groove and the second valve casing.

10. A gas-using apparatus, characterized by comprising an air compressor as claimed in any one of claims 7 to 9.

Images