CN216555522U

CN216555522U - One-way valve

Info

Publication number: CN216555522U
Application number: CN202023162837.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2022-05-17
Anticipated expiration: 2030-12-24
Also published as: CN217328622U

Abstract

The utility model provides a check valve, including elastic element and retaining ring, axial along the perforating hole, the retaining ring is located one side of guide, the case head is located the opposite side of guide, retaining ring and valve rod limit connection or fixed connection, the periphery of valve rod is located to the elastic element cover, elastic element includes first end and second end, first end and guide contact, the retaining ring is including the portion of holding, the portion of holding has the chamber of holding, the opening orientation guide of holding the chamber, the second end is located the chamber of holding, the second end contacts with the diapire of the portion of holding, the second end contacts or clearance fit with the lateral wall of the portion of holding, be favorable to improving the stability of elastic element installation.

Description

One-way valve

Technical Field

The utility model relates to the technical field of fluid control, in particular to a one-way valve.

Background

In the field of fluid control, a check valve is used as a control component for controlling the conduction of a flow path, the check valve comprises an elastic element, the elastic element can be unstably fixed after being assembled, and how to improve the installation stability of the elastic element is a technical problem to be solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a one-way valve which is beneficial to improving the installation stability of an elastic element.

A one-way valve comprises a valve body, a valve core assembly and a guide piece, wherein the valve body is provided with a through hole, the valve core assembly and the guide piece are positioned in the through hole, and the guide piece is in limit connection or fixed connection with the valve body; the valve core assembly comprises a valve core head and a valve rod, the valve core head is in limit connection or fixed connection with the valve rod, and the valve rod is in sliding fit with the guide piece; the check valve further comprises an elastic element and a check ring, the check ring is located on one side of the guide part, the valve core head is located on the other side of the guide part, the check ring is in limited connection or fixed connection with the valve rod, the elastic element is sleeved on the periphery of the valve rod, the elastic element comprises a first end portion and a second end portion, the first end portion is in contact with the guide part, the check ring comprises a containing portion, the containing portion is provided with a containing cavity, an opening of the containing cavity faces towards the guide part, the second end portion is located in the containing cavity, the second end portion is in contact with the bottom wall of the containing portion, and the second end portion is in contact with or in clearance fit with the side wall of the containing portion.

The one-way valve disclosed by the utility model comprises the elastic element and the retainer ring, at least part of the elastic element is positioned in the accommodating cavity of the retainer ring, and the elastic element is in contact with or in clearance fit with the inner wall of the accommodating cavity, so that the elastic element also forms a limit in the radial direction, and the mounting stability of the elastic element is favorably improved.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 2 is a perspective view of the valve core assembly;

FIG. 3 is a cross-sectional structural schematic view of the valve spool assembly of FIG. 2;

FIG. 4 is a perspective view of the guide member;

FIG. 5 is a cross-sectional view of the guide of FIG. 4;

FIG. 6 is a cross-sectional structural schematic view of the valve body of FIG. 1;

FIG. 7 is a perspective view of a retainer ring;

FIG. 8 is a schematic cross-sectional view of the retainer ring of FIG. 7;

FIG. 9 is an enlarged partial view of portion A of FIG. 1;

FIG. 10 is an enlarged, fragmentary view of a second embodiment of section A of FIG. 1;

fig. 11 is a schematic diagram of an exploded structure of the check valve of fig. 1.

Detailed Description

The utility model is further described with reference to the following figures and detailed description:

referring to fig. 1, the check valve 100 includes a valve body 1, a valve core assembly 2 and a guide 3, the valve body 1 has a through hole 10, the valve core assembly 2 and the guide 3 are located in the through hole 10, the valve core assembly 2 can move axially in the through hole 10 to open and close a valve port 13 of the check valve 100, and in this embodiment, the through hole 10 is symmetric with respect to the axis of the through hole. The check valve 100 further comprises an elastic element 4 and a retainer ring 5, wherein one end of the elastic element 4 contacts the guide 3, the other end of the elastic element 4 contacts the retainer ring 5, and the elastic element 4 is indirectly connected with the valve core assembly 2 in a limiting manner through the retainer ring 5, the elastic element 4 can provide energy for the resetting of the valve core assembly 2, the elastic element 4 can be a spring, and the elastic element 4 can also be an elastic structure in other forms, which will not be described in detail.

The check valve 100 has a first port 11 and a second port 12, the first port 11 and the second port 12 are both formed on the outer wall of the valve body 100, the first port 11 is a port formed by the outer wall of the through hole 10 at one end of the valve body 1, the second port 12 is a port formed by the outer wall of the through hole 10 at the other end of the valve body 1, and the first port 11 and the second port 12 are arranged oppositely. The through hole 10 includes a first connection chamber 101 and a second connection chamber 102, wherein the first connection chamber 101 and the second connection chamber 102 are used for accommodating an external connection pipe or other fittings, a part of the connection pipe is located in the connection chamber and is fixed in a sealing manner with the valve body 1, and the valve core assembly 2 and the guide 3 are located between the first connection chamber 101 and the second connection chamber 102.

With reference to fig. 1, 2 and 3, the valve core assembly 2 includes a valve core head 21 and a valve rod 22, the valve core head 21 and the valve rod 22 are connected in a limiting manner or fixed manner, in this embodiment, the valve core head 21 is made of plastic or rubber, the valve rod 22 is made of stainless steel, the valve core head 21 and the valve rod 22 are separately disposed, the valve rod 22 is embedded into a cavity of the valve core head 21 and fixed to the cavity, the valve core head 21 and the valve rod 22 are made of different materials and are connected and fixed in a separated manner, which is beneficial to controlling the material cost of the valve core assembly 2, of course, the material of the valve core head 21 is not limited to plastic or rubber, and the material of the valve rod 22 is not limited to stainless steel; in other embodiments, the valve core head 21 and the valve stem 22 may be made of the same material, and the valve core head 21 and the valve stem 22 are integrally formed for easy processing. The valve core head 21 further includes a sealing member 23, in this embodiment, the sealing member 23 is formed as an O-ring, the sealing member 23 is sleeved on the outer periphery of the main body of the valve core head 21, specifically, the valve core assembly 2 includes a first concave portion 210, the first concave portion 210 is formed on the valve core head 21, the first concave portion 210 has an opening on the outer side wall of the valve core head 21, the first concave portion 210 is recessed inwards relative to the outer wall of the valve core head 21, the first concave portion 210 is arranged along the circumferential direction of the valve core head 21, at least part of the sealing member 23 is located in the first concave portion 210, and the sealing member 23 is clamped with the first concave portion 210 to form a limit position. Of course, in other embodiments, the sealing element 23 may be embedded in the first recess 210 by vulcanization and fixed to the latter, which will not be described in detail. When the check valve 100 is in a closed state, the inner wall of the first concave portion 210 and the inner cavity wall of the valve body 1 extrude the sealing element 23, and the sealing element 23 contacts with the inner wall of the valve body 1 and the wall of the first concave portion 210, so that the valve core assembly 2 and the inner cavity of the valve body 1 form sealing, internal leakage is avoided when the check valve 100 is closed, and the sealing performance of the check valve 100 is improved.

With reference to fig. 1, 3 and 4, the guide member 3 includes a main body portion 31, a guide portion 32 and a support portion 33, the main body portion 31 is shaped as a hollow cylindrical tube, and the guide portion 32 and the support portion 33 are located in an inner cavity of the main body portion 31, in this embodiment, the guide portion 32 is located approximately at the center of the inner cavity of the main body portion 31, or the guide portion 32 and the main body portion 31 are coaxially arranged, so as to improve the structural stability of the guide member 3. The supporting portion 33 connects the guiding portion 32 and the main body portion 31, one end of the supporting portion 33 is fixed to the inner wall of the main body portion 31, and the other end of the supporting portion 33 is fixed to the outer wall of the guiding portion 32, specifically, the supporting portion 33 extends from the outer wall of the guiding portion 32 to the inner wall of the main body portion 31 in the radial direction of the main body portion 31, and the supporting portion 33 has the function of connecting and fixing the guiding portion 32 and supporting the main body portion 31. The number of the supporting portions 32 is plural, the supporting portions 33 are distributed discretely along the outer wall of the guide portion 32 along the circumferential direction of the guide member 3, and the space between the adjacent supporting portions 33 forms the fluid passage 30, which facilitates the passage of the fluid and reduces the flow resistance of the check valve 100. The guide portion 32 further has a guide hole 320 extending therethrough in the axial direction, at least a part of the stem 22 is located in the guide hole 320, the stem 22 is in clearance fit with the guide hole 320, and the stem 22 is capable of sliding in the axial direction within the guide hole 320. The guide part 32 has a guiding effect on the valve rod 2, and the one-way valve 100 limits the displacement of the valve core assembly 2 in the radial direction by arranging the guide part 3, so that the valve core assembly 2 is guaranteed to move along the axis direction of the through hole 10 all the time, and the situation that the valve core assembly 2 inclines or is eccentric when acting is avoided, and then the unstable situation that the valve port 13 cannot be closed by the valve core head 21 is caused, and the reliability of the work of the one-way valve 100 is improved. Furthermore, the hole wall of the guide hole 320 is shaped in a special way or the hole wall of the guide hole 320 is a non-rotating body, and the shape of the valve rod 22 is matched with the shape of the guide hole 320, so that the rotation of the valve core assembly 2 is prevented, and the noise of the check valve 100 is reduced.

With reference to fig. 1 and 6, the through hole 10 includes a guide cavity 103, a flow cavity 104 and a valve cavity 105, and along the axial direction of the through hole 10, the guide cavity 103, the flow cavity 104 and the valve cavity 105 are all located between the first connection cavity 101 and the second connection cavity 102, wherein the guide cavity 103 is connected with the first connection cavity 101, and the valve cavity 105 is connected with the second connection cavity 102; in the axial direction of the through hole 10, the flow chamber 104 is located between the pilot chamber 103 and the valve chamber 105, and the flow chamber 104 connects the pilot chamber 103 and the valve chamber 105, the flow chamber 104 has an inner diameter smaller than the pilot chamber 103 and the valve chamber 105, and the connection of the flow chamber 104 and the valve chamber 105 is formed as the valve port 13, or the valve port 13 is located between the flow chamber 104 and the valve chamber 105, as shown in fig. 6.

Wherein the guide member 3 is located in the guide cavity 103 and is in limit connection with the valve body 1, specifically, the main body portion 31 of the guide member 3 is in clearance fit with the inner wall of the guide cavity 103, so that the guide member 3 is limited in the radial direction to the guide cavity 103. The inner diameter of the flow chamber 104 is smaller than the inner diameter of the guide chamber 103, and the flow chamber 104 is connected to the guide chamber 103 such that a step 1031 is formed between the flow chamber 104 and the guide chamber 103, the step 1031 is located between the guide chamber 103 and the flow chamber 104 in the axial direction of the through hole 10, and the step 1031 connects the inner wall of the guide chamber 103 and the inner wall of the flow chamber 104; the valve body 1 further comprises a second recess 1032, the second recess 1032 is shaped as an annular groove, in particular, the second recess 1032 is shaped on the inner wall of the guide chamber 103, the second recess 1032 has an opening on the inner wall of the guide chamber 103, and the second recess 1032 is recessed relative to the inner wall of the guide chamber 103, the second recesses 1032 are continuously distributed along the circumference of the guide chamber 103, and in the axial direction of the through hole 10, the second recess 1032 is located at one end of the guide chamber 103 close to the first connecting chamber 101, or in other words, the second recess 1032 and the step 1031 are located at opposite sides of the guide chamber 103. The check valve 100 further includes a snap ring 6, at least a portion of the snap ring 6 is located in the second recess 1032, the snap ring 6 is clamped and fixed with the second recess 1032, specifically, the snap ring 6 has elasticity in a radial direction, so that the snap ring 6 abuts against an inner wall of the second recess 1032, the snap ring 6 can be limited in the second recess 1032, the guide 3 is located in the guide cavity 103, one end of the guide 3 abuts against the step 1031 along an axial direction of the through hole 10, the other end of the guide 3 abuts against the snap ring 6, the guide 3 is limited in the guide cavity 103 in the axial direction, and because an outer wall of the guide 3 is in clearance fit with the inner wall of the guide cavity 103, the guide 3 is also limited in the guide cavity 103 in the radial direction, so that the guide 3 forms a limit connection with the valve body 1, and the guide 3 is prevented from moving in the valve body 1. Furthermore, the snap ring 6 may also have elasticity in the axial direction of the through hole 10, so that the snap ring 6 provides a pre-tightening force to the guide 3 in the axial direction, and the limit connection between the guide 3 and the valve body 1 can be more stable. The check valve 100 enables the guide piece 3 to be arranged in the guide cavity 103 of the valve body 1 through the arrangement of the clamping ring 6, so that the installation steps can be simplified, the operation is simple, and the maintenance and the replacement of the components of the check valve 100 are convenient.

The spool head 21 is located in the valve cavity 105, and the spool head 21 can move in the axial direction of the through hole 10 in the valve cavity 105 so that the spool head 21 opens the valve port 13 or closes the valve port 13, so that the check valve 100 can be opened or closed. The inner wall forming the valve chamber 105 comprises a first wall 110, the first wall 110 is close to the second connection chamber 102 compared with the first connection chamber 101, the first wall 110 is connected with the inner wall of the flow-through chamber 104, a part or all of the surrounded area of the first wall 110 comprises the valve port 13, when the valve assembly 2 closes the check valve 100, the sealing member 23 is in contact with the first wall 110, or the inner wall of the first recess 210 and the first wall 110 press the sealing member 23, so that the fluid passage of the check valve 100 is closed and sealed. The valve port 13 is formed in the valve body 1, and the valve core head 21 seals the valve port 13 while closing the valve port 13, so that the check valve 100 is sealed integrally, and the sealing performance of the check valve 100 is controlled.

When the pressure of the second port 12 is greater than the pressure of the first port 11, under the action of the pressure, the spool head 21 moves toward the valve port 13 along the axial direction, the inner wall of the first recess 210 presses the sealing member 23, the sealing member 23 is attached to the first wall 110, and the first port 11 is not communicated with the second port 12. When the check valve 100 is operated, when the pressure of the first port 11 is greater than the pressure of the second port 12, the spool head 21 is separated from the first wall 110 under the action of the pressure, and the sealing member 23 is separated from the first wall 110, so that the first port 11 is communicated with the second port 12. For convenience of description, a first direction from the first interface 11 to the second interface 12 is defined, and the first direction may also be defined as follows: the first direction is a flow direction of the fluid when the check valve 100 operates, in the present embodiment, the first port 11 is an inlet of the check valve 100, and the second port 12 is an outlet of the check valve 100, and as illustrated in fig. 1, an axial direction of the through hole 10 is parallel to the first direction.

It can be known that, when the check valve 100 operates, fluid flows into the guide chamber 103 from the first connection chamber 101 in the first direction, and then enters the circulation chamber 104 after passing through the valve stem 22, the guide member 3 and other major components, and as the fluid pressure increases, the high-pressure fluid accumulated in the circulation chamber 104 makes the valve core head 21 leave the valve port 13 against the elastic force of the elastic element 4, and the fluid enters the valve chamber 105, so that the check valve 100 is conducted. In this structure, the main components such as the valve stem 22 and the guide 3 and the valve core head 21 are respectively located at two sides of the valve port 13, and after the fluid enters the valve cavity 105, the fluid directly enters the second connection cavity 102 without flowing through other components, which is beneficial to reducing the flow resistance of the check valve 100 during operation.

With reference to fig. 1, 2, 3 and 6, in the present embodiment, the valve core head 21 further includes a first sub-portion 211 and a second sub-portion 212, the first sub-portion 211 is closer to the valve port 13 than the second sub-portion 212, the groove wall forming the first recess 210 includes a wall of the first sub-portion 211 and a wall of the second sub-portion 212, an outer diameter of the first sub-portion 211 is smaller than an outer diameter of the second sub-portion 212, a radial dimension 2111 of an outer diameter surface of the first sub-portion 211 increases in the first direction, accordingly, in order to fit the valve core head 21 to an inner wall of the valve chamber 104, the first wall 110 is inclined with respect to an axis of the through hole 10, an inner diameter of the first wall 110 also increases in the first direction, and when the valve core head 21 closes the valve port 13, the first sub-portion 211 abuts against the first wall 110. In the downstream direction of the valve port 13, the inner diameter of the first wall 110 is increased, so that the fluid passage is enlarged, which is beneficial to reduce the flow resistance of the check valve 100. Furthermore, the inner wall forming the valve chamber 105 further comprises a second wall 120, and the second wall 120 is located between the first wall 110 and the second connection chamber 102 along the first direction, or the second wall 120 is closer to the second connection chamber 102 than the first wall 110; the second wall 120 has an inner diameter larger than that of the first wall 110, or the first wall 110 is closer to the axis of the through-hole 10 than the second wall 120 in the radial direction of the through-hole 10. When the valve core assembly 2 opens the valve port 13, the valve core assembly 2 moves towards the second port 12, and the valve core head 21 is located in the area surrounded by the first wall 110 and the second wall 120, so that the flow area of the fluid is increased, and the flow resistance is favorably reduced. More specifically, the second wall 120 includes a first connection wall 121, a second connection wall 122, and a third connection wall 123, wherein, in the first direction, the third connection wall 123 is located between the first connection wall 121 and the second connection wall 122, the second connection wall 122 is closer to the second connection cavity 102 than the first connection wall 121, and the first connection wall 121 is located between the first wall 110 and the third connection wall 123. In the present embodiment, the first connecting wall 121 connects the first wall 110 and the third connecting wall 123, the first connecting wall 121 extends from the valve port 13 toward the second port 12, and the inner diameter of the first connecting wall 121 increases in the first direction. The second connecting wall 122 connects the third connecting wall 123 and the inner wall of the second connecting cavity 102, the second connecting wall 122 extends from the third connecting wall 123 toward the second port 12, the inner diameter of the second connecting wall 122 is larger than the inner wall of the second connecting cavity 102, and the inner diameter of the second connecting wall 122 decreases in the first direction. The first connecting wall 121 and the second connecting wall 122 are disposed obliquely with respect to the axis of the through hole 10, so that the inner diameter of the valve cavity 105 is enlarged, thereby enlarging the fluid passage between the valve core head 21 and the inner wall of the valve body 1, facilitating the fluid flow, and further reducing the flow resistance of the check valve 100.

With reference to fig. 1, 7, 8, 9 and 10, the retainer ring 5 is connected or fixedly connected with the valve core assembly 2 in a limiting manner, and the elastic element 4 is indirectly connected with the valve core assembly 2 in a limiting manner through the retainer ring 5. Specifically, along the axial direction of the through hole 10, the check ring 5 is connected to the end of the valve rod 22 far from the valve core head 21, where the end of the valve rod 22 may include the end of the valve rod 22 and a position apart from the end, and is not limited to be a terminal end, such that, along the axial direction of the through hole 10, the check ring 5 is located on one side of the guide 3, the valve core head 21 is located on the other side of the guide 3, the elastic element 4 is sleeved on the outer periphery of the valve rod 22, the elastic element 4 is located between the check ring 5 and the guide 3, one end of the elastic element 4 is in contact with the guide 3, the other end of the elastic element 4 is in contact with the check ring 5, the elastic element 4 is in a compressed state, such that the elastic element 4 indirectly applies an elastic force to the valve core assembly 2 through the check ring 5, such that the valve core head 21 closes the valve port 13 in a natural state, thereby bringing the check valve 100 into a closed state, and the elastic element 4 provides a pretension for closing of the check valve 100, the inner leakage of the check valve 100 in the natural valve closing state is avoided; when the fluid pressure of the first port 11 is greater than the fluid pressure of the second port 12, the valve core head 21 moves in the first direction under the pushing of the fluid pressure, the valve core head 21 leaves the valve port 13, the check valve 100 is in an open state, the valve core head 21 drives the valve rod 22 when moving in the first direction, the valve rod 22 drives the retainer ring 5 to further compress the elastic element 4, and at this time, the elastic element 4 can buffer the movement of the valve core assembly 2 and can limit the movement stroke of the valve core assembly 2; when the fluid pressure of the first port 11 is smaller than the fluid pressure of the second port 12, the spool head 21 is pushed by the fluid pressure to move toward the first port 11 along the axial direction of the through hole 10 until the spool head 21 closes the valve port 13, and the check valve 100 is in the closed state again. In the process of closing the valve port 13 of the valve core head 21, the elastic element 4 is recovered, the elastic element 4 pushes the retainer ring 5, the retainer ring 5 drives the valve rod 22, and the valve rod 22 further drives the valve core head 21 to move towards the first port 11, which is beneficial to improving the resetting effect of the check valve 100.

The retainer ring 5 includes a housing portion 50, and the housing portion 50 has a housing cavity 501, and an opening of the housing cavity 501 faces the guide 3. The elastic element 4 includes a first end portion 41 and a second end portion 42, the first end portion 41 and the second end portion 42 are located at two opposite ends of the elastic element 4 along the axial direction of the through hole 10, the first end portion 41 is in contact with the guide 3, the second end portion 42 is located in the accommodating chamber 501, the second end portion 42 is in contact with the bottom wall of the accommodating chamber 501, and the second end portion 42 is in contact with or clearance-fit with the side wall of the accommodating chamber 501. Specifically, the retainer ring 5 includes a base plate portion 51 and a stopper portion 52, wherein the stopper portion 52 protrudes toward the guide 3 relative to the base plate portion 51, in the present embodiment, the stopper portion 52 is substantially perpendicular to the base plate portion 51, in addition, the joint of the stopper portion 52 and the base plate portion 51 may also have a rounded transition, the stopper portion 52 is continuously distributed along the circumferential direction of the base plate portion 51, such that the area surrounded by the stopper portion 52 and the base plate portion 51 forms the receiving cavity 501, or the base plate portion 51 and the stopper portion 52 together form the receiving portion 50, the bottom wall of the receiving portion 50 is located at the base plate portion 51, the side wall of the receiving portion 50 is located at the stopper portion 52, the second end portion 42 contacts the base plate portion 51 along the axial direction of the through hole 10, and the second end portion 42 contacts or is in clearance fit with the stopper portion 52 along the radial direction of the through hole 10, it should be noted that the clearance fit here is within a range of 0-1 mm, such that the elastic element 4 forms a stopper in both the axial direction and the radial direction of the through hole 10, the installation of the elastic element 4 is more stable, the resonance caused by a larger gap between the elastic element 4 and the valve rod 22 when the elastic element 4 is sleeved on the periphery of the valve rod 22 is avoided, and the stability of the action of the one-way valve 100 is improved.

In the present embodiment, the retainer ring 5 has the mounting hole 500, the mounting hole 500 is formed in the base plate portion 51, the mounting hole 500 axially penetrates the base plate portion 51, and the mounting hole 500 is provided coaxially with the through hole 10, which facilitates assembly of the retainer ring 5 and the valve body assembly 2. The retainer ring 5 further includes a connecting portion 53, the connecting portion 53 protrudes from the surface of the base plate portion 51, the connecting portions 53 are distributed along the circumferential direction of the mounting hole 500, the connecting portion 53 is inclined with respect to the axis of the mounting hole 500, and the inner diameter of the connecting portion 53 increases along the first direction, so in this embodiment, the connecting portions 53 are distributed discretely along the circumferential direction of the mounting hole 500, which is beneficial to eliminating the internal stress generated by the connecting portion 53 during forming, and the structure of the connecting portion 53 is more stable. The stem 22 has a first groove 220, the first groove 220 is formed as an annular groove, the first groove 220 has an opening on an outer side wall of the stem 22, and the first groove 220 is recessed inward with respect to the outer side wall of the stem 22, the first groove 220 being distributed along a circumferential direction of the stem 22. When the check valve 100 is assembled, part of the valve stem 22 extends into the mounting hole 500 of the check ring 5, at least part of the connecting portion 53 is located in the first groove 220, and the wall of the connecting portion 53 abuts against the wall of the first groove 220, so that the check ring 5 and the valve stem 22 form a clamping fixation. The check ring 5 is directly clamped and fixed with the valve rod 22 through the connecting part 53, so that the check ring 5 is not required to be fixed with the valve rod 22 through an external limiting mechanism, necessary parts for fixing the check ring 5 and the valve rod 22 are reduced, and the cost of the check valve 100 is reduced.

In another embodiment, the retainer ring 5 may not have the mounting hole 500 and the connecting portion 53, and the stem 22 may have an end portion facing the retainer ring 5 in the axial direction of the through hole 10, and the end portion of the stem 22 facing the retainer ring 5 may be abutted against the base plate portion 51, and both may be welded or adhesively fixed at the abutted portion, as shown in fig. 10, which may further simplify the structure of the retainer ring 5 and contribute to reduction of material cost.

With reference to fig. 1 and 11, a method of assembling a non-return valve 100, the method of assembling comprising at least the steps of:

s1, placing the sealing element 23 in the first concave part 210, thereby assembling to form the valve core head 21, embedding the valve rod 22 into the concave cavity of the valve core head 21, and assembling the valve rod 22 and the valve core head 21 into a whole to form the valve core assembly 2;

s2, sequentially placing the guide piece 3 and the clamping ring 6 into the guide cavity 103 from the first connector 11, clamping and fixing the clamping ring 6 with the second concave part 1032, wherein one end of the guide piece 3 is abutted against the step part 1031 along the axial direction of the through hole 10, the other end of the guide piece 3 is abutted against the clamping ring 6, and the guide piece 3 is in limit connection with the valve body 1;

s3, putting the valve core assembly 2 assembled into a whole into the through hole 10 from the second interface 12, and making the valve rod 22 pass through the guide hole 320, and making the sealing member 23 contact with the first wall 110;

s4, sequentially placing the elastic element 4 and the check ring 5 into the through hole 10 from the first connector 11, sleeving the elastic element 4 on the periphery of the valve rod 22, clamping and fixing the check ring 5 and the valve rod 22, wherein one end of the elastic element 4 is in contact with the guide piece 3 and the other end of the elastic element 4 is in contact with the check ring 5 along the axial direction of the through hole 10.

Through the assembling method, the valve core assembly 2 and the guide piece 3 are respectively assembled into the inner cavity of the valve body 1 from the two ends of the check valve 100, so that each part is conveniently positioned when the check valve 100 is assembled, and the calibers of the first interface 11 and the second interface 12 are reduced, so that the practicability of the check valve 100 is improved.

The features of the above-described embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features of the above-described embodiments are not described, but should be construed as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.

Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims

1. The check valve is characterized by comprising a valve body, a valve core assembly and a guide piece, wherein the valve body is provided with a through hole, the valve core assembly and the guide piece are positioned in the through hole, and the guide piece is in limit connection or fixed connection with the valve body; the valve core assembly comprises a valve core head and a valve rod, the valve core head is in limit connection or fixed connection with the valve rod, and the valve rod is in sliding fit with the guide piece;

the check valve further comprises an elastic element and a check ring, the check ring is located on one side of the guide part, the valve core head is located on the other side of the guide part, the check ring is in limited connection or fixed connection with the valve rod, the elastic element is sleeved on the periphery of the valve rod, the elastic element comprises a first end portion and a second end portion, the first end portion is in contact with the guide part, the check ring comprises a containing portion, the containing portion is provided with a containing cavity, an opening of the containing cavity faces towards the guide part, the second end portion is located in the containing cavity, the second end portion is in contact with the bottom wall of the containing portion, and the second end portion is in contact with or in clearance fit with the side wall of the containing portion.

2. The check valve of claim 1, wherein the retainer ring includes a base plate portion and a stopper portion protruding toward the guide with respect to the base plate portion, the stopper portion being continuously distributed along a circumferential direction of the base plate portion, a bottom wall of the accommodating portion being located on the base plate portion, and a side wall of the accommodating portion being located on the stopper portion;

the second end portion is in contact with the substrate portion in an axial direction of the through hole; and the second end part is in contact with or in clearance fit with the limiting part along the radial direction of the through hole.

3. The check valve of claim 2, wherein the retainer ring has a mounting hole formed in the base plate portion, the mounting hole extending axially through the base plate portion; the retainer ring also comprises connecting parts, the connecting parts are raised relative to the base plate part, and the connecting parts are distributed along the circumferential direction of the mounting hole; the valve rod comprises a first groove, the first groove is provided with an opening on the outer side wall of the valve rod, the first groove is inwards sunken relative to the outer side wall of the valve rod, and the first grooves are distributed along the circumferential direction of the valve rod;

at least part of the valve rod is located in the mounting hole, at least part of the connecting part is located in the first groove, and the connecting part is clamped and fixed with the first groove.

4. The check valve of claim 3, wherein the connecting portion is disposed obliquely to an axis of the mounting hole, an inner diameter of the connecting portion increases in a direction from the retainer ring to the guide, and the connecting portion is discretely distributed in a circumferential direction of the mounting hole.

5. The check valve according to claim 2, wherein the base plate portion abuts an end portion of the valve stem facing the retainer ring in an axial direction of the through hole, and the retainer ring and the valve stem are welded or adhesively fixed at the abutting portion.

6. The one-way valve of any one of claims 1-5, wherein the through-bore comprises a pilot chamber, a flow-through chamber and a valve chamber, the flow-through chamber being located between the pilot chamber and the valve chamber in an axial direction of the through-bore, the flow-through chamber connecting the pilot chamber and the valve chamber; the inner diameter of the circulation cavity is smaller than that of the guide cavity and that of the valve cavity, the guide piece is positioned in the guide cavity, and the valve core head is positioned in the valve cavity; the valve body is also provided with a valve port which is positioned between the flow cavity and the valve cavity, and the valve core head can close and seal the valve port.

7. The check valve as claimed in claim 6, wherein the valve body has a first port and a second port, the first port and the second port are ports formed on the surface of the valve body by the through hole, and the valve core head is close to the second port relative to the valve port along the axial direction of the through hole; the valve body comprises a first wall which is shaped as an inner wall of the valve chamber and is connected with the inner wall of the flow cavity, and the area surrounded by the first wall comprises a valve port; the first wall is obliquely arranged relative to the axis of the through hole, and the inner diameter of the first wall is increased from the first port to the second port; the valve core head comprises a first sub-portion and a second sub-portion, the first sub-portion is close to the valve port relative to the second sub-portion along the axial direction of the through hole, the outer diameter of the first sub-portion is smaller than that of the second sub-portion, and the outer diameter of the first sub-portion is increased from the first port to the second port; the first sub-portion can abut the first wall.

8. The one-way valve of claim 7, wherein the spool assembly includes a first recess formed in the spool head, the first recess having an opening in an outer wall of the spool head, the first recess being recessed relative to the outer wall of the spool head, the wall forming the first recess including a wall of the first sub-section and a wall of the second sub-section; the valve core head includes a seal located in the first recess, the seal being configured to contact the first wall and a wall of the first recess.

9. The check valve of claim 6, wherein the valve body includes a stepped portion between the guide chamber and the flow-through chamber in an axial direction of the through-hole, the stepped portion connecting an inner wall of the guide chamber and an inner wall of the flow-through chamber;

the valve body comprises a second concave part which is formed in the guide cavity, the second concave part is provided with an opening on the inner wall of the guide cavity, the second concave part is concave relative to the inner wall of the guide cavity, the second concave part is continuously distributed along the circumferential direction of the guide cavity, and the second concave part and the step part are positioned at two opposite ends of the guide cavity along the axial direction of the through hole; the check valve comprises a clamping ring, at least part of the clamping ring is positioned in the second concave part, and the clamping ring is abutted against the inner wall of the second concave part; the guide piece is positioned between the clamping ring and the step part along the axial direction of the through hole, one end of the guide piece is abutted against the step part, and the other end of the guide piece is abutted against the clamping ring; the outer wall of the guide piece is in clearance fit with the inner wall of the guide cavity.

10. The check valve of any one of claims 1-5, wherein the guide member includes a main body portion, a guide portion and a support portion, the guide portion and the support portion being located in an inner cavity of the main body portion, one end of the support portion being fixed to an outer wall of the guide portion, the other end of the support portion being fixed to an inner wall of the main body portion, the support portion connecting the guide portion and the main body portion; the guide part is provided with a guide hole, the guide hole penetrates through the guide part along the axial direction of the through hole, at least part of the valve rod is positioned in the guide hole, the valve rod is in clearance fit with the guide hole, and the valve rod can slide in the guide hole along the axial direction.