阅读说明：本技术 一种单向阀 (One-way valve ) 是由 不公告发明人 于 2018-06-29 设计创作，主要内容包括：一种单向阀,包括阀体、阀芯组件、挡圈,所述阀体包括凹槽,所述挡圈装配于所述凹槽,为所述阀芯限位,所述挡圈包括外部件、内部件,所述外部件与所述内部件通过三条臂相连,所述外部件包括第一端部和第二端部,第一端部和第二端部分开设置。这样的单向阀可以使阀体一体设置,无需焊接,有效提高单向阀的使用完全性和寿命。(A check valve comprises a valve body, a valve core assembly and a retainer ring, wherein the valve body comprises a groove, the retainer ring is assembled in the groove and used for limiting the valve core, the retainer ring comprises an outer part and an inner part, the outer part and the inner part are connected through three arms, the outer part comprises a first end part and a second end part, and the first end part and the second end part are separately arranged. Such check valve can make the integrative setting of valve body, need not the welding, effectively improves check valve's use completeness and life-span.)

1. A check valve comprising a valve body, a valve core assembly, the valve body comprising a valve body wall, wherein the valve body wall comprises a groove, the check valve further comprising a retainer ring, the retainer ring being integrally disposed, the retainer ring comprising an outer member and an inner member, the outer member being disposed outside the inner member, at least a portion of the outer member being disposed in the groove and the outer member being disposed in spaced relation to the valve body wall, the inner member comprising a through-hole, the valve core assembly comprising a stem portion, one end of the stem portion extending into the through-hole;

the outer member includes a first end portion, a second end portion, a body portion connecting the first end portion and the second end portion, the retainer ring further includes a first arm connecting the first end portion and the inner member, a second arm connecting the second end portion and the inner member, and a third arm connecting the body portion and the inner member, a distance is maintained between the second end portion and the first end portion, a distance is maintained between the second arm and the first arm, the first arm includes a first section, the second arm includes a second section, the first section is connected to the inner member, the second section is connected to the inner member, the first section has a width smaller than the third arm, the first section has a width smaller than the outer member, and the second section has a width smaller than the third arm, the second segment has a width less than a width of the outer member.

2. The one-way valve of claim 1, wherein the width of the connection of the body portion to the third arm is greater than the width of the body portion near the first end, and the width of the connection of the body portion to the third arm is greater than the width of the body portion near the second end.

3. The check valve according to claim 1 or 2, wherein the width of the first section is 0.3mm to 1mm, the width of the second section is 0.3mm to 1mm, the width of the portion where the main body portion and the third arm are connected is twice or more the width of the first section, and the width of the portion where the main body portion and the third arm are connected is twice or more the width of the second section.

4. The check valve of claim 1, 2 or 3, wherein the width of the first arm is greater than the width of the first segment at the remaining portion except the first segment, and the width of the second arm is greater than the width of the second segment at the remaining portion except the second segment.

5. The check valve according to any one of claims 1 to 4, wherein an outer circumference of a portion of the inner member between the first arm and the third arm is arc-shaped, an outer circumference of a portion of the inner member between the second arm and the third arm is arc-shaped, the first section and the second section are arc-shaped sections, the first section is connected to the inner member arc, the second section is connected to the inner member arc, a bent portion is provided between a portion of the first arm other than the first section and the first section, a bent portion is provided between a portion of the second arm other than the second section and the second section, a center line between the first arm and the second arm is a symmetry line, starting from a connection portion of the first section, the second section and the inner member, the first section and the second section are close to the symmetry line, and the rest parts of the first arm except the first section and the rest parts of the second arm except the second section radiate in the direction far away from the symmetry line.

6. The check valve of any of claims 1-5, wherein the retainer ring includes a first aperture at a junction of the first end and the first arm and a second aperture at a junction of the second end and the second arm, the outer member including an inner portion having an arc shape with a center angle of 240 ° -300 °.

7. The check valve of any of claims 1-6, wherein the inner member includes a protruding portion, the protruding portion being located between the first arm and the second arm, the protruding portion being located at an outer periphery of the through hole, the protruding portion protruding toward an opening position between the first arm and the second arm, the protruding portion leaving a gap with the first arm, the protruding portion leaving a gap with the second arm;

the valve core assembly comprises a spring, the spring is sleeved on the rod-shaped portion, one end of the spring abuts against the inner part, and at least part of the spring abuts against the protruding portion.

8. The check valve according to any one of claims 1 to 7, wherein a cross-sectional shape of the rod-shaped portion in a radial direction of the valve body is non-circular, and the through-hole has a shape that fits the cross-sectional shape, and is a sliding fit or a clearance fit with the rod-shaped portion;

the outer member includes an inner portion and an outer portion, the inner portion being located between the outer portion and the inner member, the outer portion being located in the groove, the inner portion not being located in the groove, at least a portion of an outer periphery of the outer portion abutting the groove bottom wall.

9. The check valve of any of claims 1-8, wherein the stem is shaped as a multi-lobe, and the through-hole is shaped as a combination of a sector and a square, the sector and the square overlapping, the sector and the square having the same axis of symmetry, the sector being angled at 120 °.

10. The one-way valve of claim 1, wherein the width of the connection of the body portion to the third arm is greater than the width of the body portion proximate the first end, and the width of the connection of the body portion to the third arm is greater than the width of the body portion proximate the second end;

the width of the first section is 0.3mm-1mm, the width of the second section is 0.3mm-1mm, the width of the connecting part of the main body part and the third arm is more than twice of the width of the first section, and the width of the connecting part of the main body part and the third arm is more than twice of the width of the second section;

the width of the rest parts of the first arm except the first section is larger than that of the first section, and the width of the rest parts of the second arm except the second section is larger than that of the second section;

the outer circumference of the part of the inner part between the first arm and the third arm is arc, the outer circumference of the part of the inner part between the second arm and the third arm is arc, the first section and the second section are in the form of arc sections, the first section is connected with the inner part in an arc manner, the second section is connected with the inner part in an arc manner, bent parts are arranged between the rest parts of the first arm except the first section and the first section, bent parts are arranged between the rest parts of the second arm except the second section and the second section, the center line between the first arm and the second arm is a symmetry line, the connection part of the first section, the second section and the inner part is a starting point, the first section and the second section are close to the symmetry line, and the rest parts of the first arm except the first section and the rest parts of the second arm except the second section are far away from the symmetry line Radiating in a linear direction;

the retainer ring comprises a first hole and a second hole, the first hole is positioned at the joint of the first end and the first arm, the second hole is positioned at the joint of the second end and the second arm, the outer part comprises an inner side part, the inner side part is in a circular arc shape, and the central angle corresponding to the circular arc shape of the inner side part is 240-300 degrees;

the inner member includes a protruding portion located between the first arm and the second arm, the protruding portion being located on an outer periphery of the through hole, the protruding portion protruding toward an opening position between the first arm and the second arm, a gap being left between the protruding portion and the first arm, and a gap being left between the protruding portion and the second arm;

the valve core assembly comprises a spring, the spring is sleeved on the rod-shaped part, one end of the spring is abutted against the inner part, and at least part of the spring is abutted against the protruding part;

the cross section of the rod-shaped part along the radial direction of the valve body is non-circular, the shape of the through hole is matched with that of the cross section, and the through hole is in sliding fit or clearance fit with the rod-shaped part;

the outer member includes an inner portion and an outer portion, the inner portion being located between the outer portion and the inner member, the outer portion being located in the groove, the inner portion not being located in the groove, at least a portion of an outer periphery of the outer portion abutting the groove bottom wall;

the shape of the rod-shaped part is a multi-petal shape, the shape of the through hole is formed by combining a fan shape and a square shape, the fan shape and the square shape are partially overlapped, the fan shape and the square shape have the same symmetry axis, and the fan-shaped angle is 120 degrees.

Technical Field

The invention relates to the technical field of fluid control.

Background

The check valve is a valve body machine which makes fluid flow in along an inlet of a valve body and flow out of an outlet of the valve body and is used for preventing the reverse flow of the fluid.

In refrigeration systems, such as air conditioning systems, one-way valves are one of the commonly used components.

The check valve shown in fig. 1 comprises a valve body 1, a valve core assembly 2 and a retainer ring 4. The valve body 1 comprises a valve cavity 5, the valve core assembly 2 is located in the valve cavity 5, the valve core assembly 2 is composed of a piston assembly, a guide pillar assembly and a spring 3, the check valve comprises an inlet 6, a check ring 4 is used for limiting the positions of the valve core assembly and the spring, the check ring is fixed through the two-section type valve body, the two sections of the check valve body are in butt joint and then are welded and fixed, the check ring is fixed through the two-section type valve body, on one hand, the processing is complex, and on the other hand, the risk of leakage is caused by corrosion at the welding position of.

Disclosure of Invention

The invention aims to provide a one-way valve with a novel structure.

The technical scheme of the invention provides a one-way valve, which comprises a valve body and a valve core assembly, wherein the valve body comprises a valve body wall and is characterized in that the valve body wall comprises a groove, the one-way valve further comprises a retainer ring, the retainer ring is integrally arranged, the retainer ring comprises an outer part and an inner part, the outer part is positioned outside the inner part, at least part of the outer part is positioned in the groove, the outer part and the valve body wall are limited and arranged, the inner part comprises a through hole, the valve core assembly comprises a rod-shaped part, and one end of the rod-shaped part extends into the through hole; the outer member includes a first end portion, a second end portion, a body portion connecting the first end portion and the second end portion, the retainer ring further includes a first arm connecting the first end portion and the inner member, a second arm connecting the second end portion and the inner member, and a third arm connecting the body portion and the inner member, a distance is maintained between the second end portion and the first end portion, a distance is maintained between the second arm and the first arm, the first arm includes a first section, the second arm includes a second section, the first section is connected to the inner member, the second section is connected to the inner member, the first section has a width smaller than the third arm, the first section has a width smaller than the outer member, and the second section has a width smaller than the third arm, the second segment has a width less than a width of the outer member.

According to the technical scheme, the check ring with the newly designed structure comprises an outer part and an inner part, the valve core assembly comprises a rod-shaped part, one end of the rod-shaped part extends into a through hole of the inner part, the check ring can limit the position of the valve core assembly, meanwhile, the width of the first section of the check ring is smaller than that of the third arm, and the width of the second section of the check ring is smaller than that of the third arm, so that the first arm and the second arm can be displaced under the action of external force, and the first arm and the second arm can rebound outwards under the condition of no stress.

Drawings

Fig. 1 is a schematic cross-sectional view of a prior art check valve.

Fig. 2 is a schematic cross-sectional view of a one-way valve according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of the valve body of the check valve shown in fig. 2.

Fig. 4 is a schematic view of a retainer ring of the check valve of fig. 2.

Fig. 5 is a schematic cross-sectional view of the valve cartridge of the check valve of fig. 2.

Fig. 6 is a schematic perspective view of a valve cartridge of the check valve of fig. 2.

Fig. 7 is a schematic view of a check valve retainer ring configuration consistent with fig. 4.

Fig. 8 is a perspective view of a check valve retainer ring consistent with fig. 4.

Detailed Description

Specific embodiments will now be described in detail with reference to the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. Those skilled in the art will appreciate that the specific components, devices, and features illustrated in the accompanying drawings and described herein are merely exemplary and should not be considered as limiting.

The axial direction or axial direction of the valve body in the specification refers to the axial direction of the valve cavity included in the valve body, or the direction which is the same as or parallel to the axial direction of the valve cavity, as shown by a chain line in fig. 2.

In the present specification, the inward direction means a direction toward the axis of the valve body, and the outward direction means a direction toward the periphery of the valve body.

Fig. 2 illustrates a check valve 10 that includes a valve body 1100, a valve core assembly mounted inside the valve body, the valve core assembly including a valve core 1200, a seal ring 1300, and a spring 1400, and a retainer ring 1500. The retainer ring 1500 is disposed in a limited or fixed manner with respect to the valve body 1100, and referring to fig. 4, the retainer ring 1500 includes a through hole 1512, and it should be noted that the retainer ring mentioned herein does not mean that this component has only a limiting function, and also has a function of guiding movement of the valve element. At least a portion of the valve core 1200 extends into the through hole 1512, the spring 1400 is sleeved on a portion of the valve core 1200, and one end of the spring 1400 abuts against the retainer ring 1500, so that the valve core 1200 moves along the axial direction of the valve body.

Referring to fig. 3, the valve body 1100 includes a valve body wall 1120, a cavity formed by the valve body wall 1120 is a valve cavity 1110, and the valve core assembly is located in the valve cavity 1110.

The direction of fluid flow into the check valve 10 as indicated by the arrows in fig. 2 is the forward direction, and the inlet 1600 is defined as the port through which fluid flows into the check valve body when the fluid flow direction of the check valve 10 is the forward direction.

The valve body wall 1120 includes a first wall 1124, a second wall 1125, and a third wall 1123. The first wall 1124 is located between the third wall 1123 and the second wall 1125. The first wall 1124 is closer to the inlet than the second wall 1125.

The valve chamber 1110 includes a first chamber 1114, a second chamber 1115, and a third chamber 1113. The first cavity 1114 corresponds to the first wall 1124, the second cavity 1115 corresponds to the second wall 1125, and the third cavity 1113 corresponds to the third wall 1123.

The second chamber 1115 is provided primarily to facilitate connection of the one-way valve 10 to external structures.

The third wall 1123 has a first portion 11231 relatively close to the inlet 1600 and a second portion 11232 relatively far from the inlet 1600, the first portion 11231 and the second portion 11232 being arranged in the axial direction of the valve body 1100, the third wall extending in an expanding manner from the first portion 11231 to the second portion 11232.

At least a portion of the third wall 1123 seals in contact with a seal ring 1300 when at least a portion of the third wall 1123 abuts the valve core head 1210. The third wall 1123 is a surface of revolution defined as a surface generated by a rotation of a line around a fixed line on the plane on which it lies. The third wall 1123 has a surface roughness of 0.8-1.6. The meridian of the surface of revolution corresponding to the third wall 1123 may be a straight line, and the angle of the meridian to the axis of the valve body 1100 is 15-45 °. Of course, the meridian may be a curve as well as a broken line. This arrangement can significantly improve the sealing performance of the check valve 10, and the seal ring 1300 has a long service life.

Referring to fig. 5 and 6, the valve core 1200 includes a valve core head 1210, a rib 1220, and a rod portion 1230. The shaft portion 1230 extends from the valve core head 1210 in a direction away from the inlet, the rib 1220 extends radially from the valve core head 1210, and the rib 1220 is closer to the first wall than the shaft portion 1230.

The number of the protruding ribs 1220 is two or more, and the two or more protruding ribs 1220 are arranged at intervals, in the embodiment of the drawings, the number of the protruding ribs is three. The rib 1220 has a circular arc end surface. The circular arc end surface is in clearance fit or sliding fit with the first wall 1124. The rib 1220 cooperates with the first wall 1124 to guide the movement of the valve core head 1210. The clearance between the arc-shaped end surface and the first wall 1124 is 0.1mm-0.6mm, so that the excessive opening pressure of the check valve 10 caused by the excessive friction pressure between the convex rib 1220 and the first wall 1124 when the valve core head 1210 moves can be avoided, and the guiding of the convex rib 1220 has high stability.

The valve core head 1210 is provided with an annular part 1250, the convex rib 1220 protrudes from the annular part 1250, a concave pit 1260 is arranged in the middle of the annular part 1250, one end of the rod part 1230 extends into the concave pit 1260, and the valve core 1200 is integrally arranged.

The spring 1400 is sleeved outside the rod portion 1230, and one end of the spring 1400 is in contact with the bottom wall of the recess 1260, such a structure can make the spring 1400 still be within the elastic limit when the valve core 1200 is located at the maximum stroke, where the valve core 1200 is located at the position where the valve core 1200 is located farthest away from the inlet 1600 in the movement. The other end of the spring 1400 abuts against the retainer ring 1500.

The guiding function of the convex rib 1220 and the guiding function of the rod portion 1230 make the movement of the valve core head 1210 of the check valve 10 more stable during operation, and indirectly make the sealing performance of the check valve 10 better.

The rod portion 1230 may be a section with a uniform cross section, or may be divided into several sections with non-uniform cross sections. The rod-shaped portion may have a circular or non-circular cross-sectional shape in the radial direction of the valve body. Taking the rod portion 1230 as an example, the rod portion 1230 includes a first portion 1231 and a second portion 1232, the equivalent outer diameter of the second portion 1232 is smaller than the equivalent outer diameter of the first portion 1231, the first portion 1231 protrudes from the annular portion, a portion of the second portion 1232 protrudes into the through hole 1512, and the spring 1400 is in interference fit with the first portion 1231. The cross-sectional shape of the second portion 1232 along the radial direction of the valve body 1100 may be circular or non-circular, and the shape of the through hole 1512 is adapted to the cross-sectional shape. When the cross-sectional shape is non-circular, the valve element is effectively prevented from rotating, and in addition, the equivalent outer diameter of the second portion 1232 is smaller than the inner diameter of the spring 1400. The rod portion 1230 cooperates with the retainer ring 1500 to guide the movement of the valve core head 1210.

Referring to fig. 5 and 6, the valve core head 1210 includes a gradually expanding portion 1211 and a concave portion 1212, and the concave portion 1212 is located between the annular portion 1250 and the gradually expanding portion 1211. The annular portion 1250 is closer to the rib 1220 than the diverging portion 1211 is. The recess 1212 is close to the divergent portion 1211, the divergent portion 1211 includes a peripheral wall 12111, a bottom wall of the recess 1212 is recessed relative to the peripheral wall 12111, and the sealing ring 1300 is at least partially located in the recess 1212. The seal 1300 may be an O-ring or may be a seal including an O-ring body.

The divergent portion 1211 includes a peripheral wall 12111, a bottom wall of the recess 1212 is recessed from the peripheral wall 12111, the peripheral wall 12111 is disposed corresponding to the third wall 1123, and the peripheral wall 12111 is a curved surface of revolution. The longitude length of the peripheral wall 12111 is 1-1.2mm, which not only can ensure the strength required by the valve core 1210 when the check valve 10 is in the closed state, but also can make the pressure difference between the front and the back of the fluid flowing through the check valve 10 smaller when the check valve 10 is in the open state. The length of the warp threads of the peripheral wall is smaller than the length of the warp threads of the third wall. The peripheral wall 12111 has a surface roughness of less than 1.6.

At least a portion of the seal 1300 abuts the third wall 1123 when the check valve 10 is in a closed state. When the check valve 10 is in an open state, the sealing ring 1300 is separated from the third wall 1123.

When the deformation of the sealing ring 1300 reaches a certain degree, at least part of the valve core head 1210 supports against the third wall 1123, so that the phenomenon that the service life of the sealing ring 1300 is too short due to too large deformation of the sealing ring 1300 can be prevented; after the sealing ring 1300 is deformed, at least part of the sealing ring is attached to the third wall 1123 to form a sealing surface to play a role in sealing the check valve, so that the check valve is prevented from leaking inwards.

The side wall of the recess 1212 adjacent the annular portion 1250 is defined as a recess rear side 12121 and the side wall of the recess 1212 adjacent the divergent portion 1211 is defined as a recess front side 12122. The recess front side 12122 is adjacent to the inlet relative to the recess rear side 12121. In the radial direction of the spool head 1210, the recess rear side 12121 protrudes relative to the recess front side 12122. The sealing ring placed in the concave portion 1212 is not easy to fall off in different working states of the one-way valve, so that the service life of the valve is prolonged, and stable sealing performance is provided. The recess rear side 12121 is not in contact with the third wall 1123 when the check valve 10 is in a closed state.

The radial direction of the valve core assembly is defined as a depth direction, the distance between the front side 12122 of the concave part and the rear side 12121 of the concave part is defined as a groove width, the depth of the rear side 12121 of the concave part is 1.4-1.8mm, and the groove width of the concave part 1212 is defined as 1.8-2mm, so that the structural arrangement can not only ensure that the internal leakage of the check valve 10 in a closed state is small, but also ensure that the differential pressure of fluid flowing through the check valve 10 before and after the check valve 10 in an open state is small.

The valve body wall 1120 is integrally formed, the valve body wall 1120 comprises a groove 1126, the groove 1126 is located between the first wall 1124 and the second wall 1125, the inner diameter of the bottom wall of the groove 1126 is larger than the inner diameter of the first wall 1124, and the inner diameter of the bottom wall of the groove 1126 is larger than the inner diameter of the second wall 1125.

As shown in fig. 4, 7, and 8, the collar 1500 is integrally provided, the collar 1500 includes an outer member 1510, an inner member 1520, the outer member 1510 being located outside the inner member, the collar 1500 includes first arms 1540, second arms 1570, and third arms 1530, the first arms 1540 connecting the outer member 1510 to the inner member 1520, the second arms 1570 connecting the outer member 1510 to the inner member 1520, and the third arms 1530 connecting the outer member 1510 to the inner member 1520. In particular, the inner member and the outer member are named according to their relative positional relationship, and do not represent any limitation to the inner member and the outer member.

The outer member includes a first end portion 1511, a second end portion 1513, and a body portion 1514, the body portion 1514 connecting the first end portion 1511 and the second end portion 1513, the first arm 1540 connecting the first end portion 1511 with the inner member 1520, the second arm 1570 connecting the second end portion 1513 with the inner member 1520, and the third arm 1530 connecting the inner member 1520 with the body portion 1514 in a position near the middle. A distance is maintained between the first end 1511 and the second end 1513, and a distance is maintained between the second arm 1570 and the first arm 1540. Keeping a distance means not directly touching.

The width of the body portion 1514 is not uniform throughout, the width of the portion of the body portion 1514 attached to the third arm 1530 is greater than the width of the body portion 1514 proximate the first end 1511, the width of the portion of the body portion 1514 attached to the third arm 1530 is greater than the width of the body portion 1514 proximate the second end 1513, primarily because the retainer ring 1500 needs to be deformed during assembly into the valve body 1100, strength support needs to be provided where the body portion 1514 is attached to the third arm 1530, position shifting is required at the first end 1511 and the second end 1513, the structural configuration of the body portion 1514 both facilitates the reduction of the outer diameter of the retainer ring 1500 during forces, and the body portion is able to give strength support to the first end 1511 and the second end 1513 after a specific position so that it springs back out after forces, the outer diameter of the valve body is enlarged and can limit the position of other valve body walls.

The first arm 1540 includes a first section 1541, the second arm 1570 includes a second section 1571, the first section 1541 is located at the connection of the first arm 1540 and the inner member 1520, the second section 1571 is located at the connection of the second arm 1570 and the inner member 1520, the first section 1541 is a small section of the connection of the first arm 1541 and the inner member 1520, and the second section 1571 is a small section of the connection of the second arm 1570 and the inner member 1520. The width h3 of the third arm 1530 is greater than the width h1 of the first section 1541, the width h3 of the third arm 1530 is greater than the width h2 of the second section 1571, the width of the first section 1541 is less than the width of the outer member 1510, the width of the second section 1571 is less than the width of the outer member 1510, so that the first arm 1540 and the second arm 1570 are deformed under the action of external force, and in an unstressed state, the first arm 1540 and the second arm 1570 can rebound outwards, so that the check valve 10 can limit the valve core without welding, and the check valve 10 eliminates the corrosion risk caused by welding the valve body.

The width h1 of the first segment 1541 is less than the width h4 of the portion where the main body portion 1514 connects with the third arm 1530, and the width h2 of the second segment 1571 is less than the width h4 of the portion where the main body portion 1514 connects with the third arm 1530. The widths of the first section 1541 and the second section 1571 are smaller than the widths of the third arm 1571 and the connecting portion between the main body 1514 and the third arm 1530, so that the first arm 1540 and the second arm 1570 can be drawn together and rebound outwards, and the structure of the first arm 1541 and the second arm 1570 is ensured to have certain strength.

More specifically, the width h1 of the first section 1541 is 0.3mm to 1mm, the width of the second section 1571 is 0.3mm to 1mm, and the width h4 of the connection portion between the main body 1514 and the third arm 1530 is two times or more, even three times or more, or four times or more of the width h1 and the width h 2. Such an arrangement may provide greater resiliency to the first and second arms 1540, 1570 and may further facilitate the assembly of the retainer ring 1500 into the valve body 1100.

In this embodiment, the width of the first arm 1540 is greater than the first section 1541 except for the first section 1541, and the width of the second arm 1570 is greater than the second section 1571 except for the second section 1571. This further facilitates the spring back of the first and second arms 1540, 1570 after being compressed, and further facilitates the spring back of the first and second arms to an unstressed starting position or a position close to the unstressed starting position. Here, "the width of the portion of the first arm other than the first section 1541" means that the portion of the first arm other than the first section has a width greater than 95% of the width of the first section 1541, and "the portion of the second arm other than the second section has a width greater than 95% of the width of the portion of the second arm other than the second section.

Of course, in other embodiments, the width of the first arm 1540 may be substantially equal to the width of the first segment 1541 except for the first segment 1541, and the width of the second arm 1570 may be substantially equal to the width of the second segment 1571 except for the second segment 1571. While the overall width of the first arm is equal and the overall width of the second arm is equal, the first section 1541 is still a small segment of the junction of the first arm 1541 and the inner member 1520 and the second section 1571 is still a small segment of the junction of the second arm 1570 and the inner member 1520. Here, the entire width is equal, and most of the widths mean that 90% or more of the widths are equal.

The retainer ring 1500 includes a first aperture 1590 and a second aperture 1560, the first aperture 1590 being located where the first end 1511 is connected to the first arm 1540, the second aperture 1560 being located where the second end 1513 is connected to the second arm 1570, the first aperture 1590 and the second aperture 1560 being positionable for application of force by an external tool, the first aperture 1590 and the second aperture 1560 being sized according to the size of the jaw of the tool being used.

The outer member includes an inner portion 1516 and an outer portion 1517, the inner portion 1516 being located between the outer portion 1517 and the inner member 1520, the outer portion 1517 being located in the recess 1126, the inner portion 1516 not being located in the recess 1126, at least a portion of the outer periphery of the outer portion 1517 abutting a bottom wall of the recess 1126. Thus, the outer side portion 1517 is located in the groove 1126, and at least a part of the periphery abuts against the bottom wall of the groove 1126, so that the position of the retainer ring 1500 and the valve body wall 1120 is limited, and the inner side portion 1126 is not located in the groove 1126, so that the retainer ring 1500 is not easily damaged in a stress process, the service life of the retainer ring is prolonged, and the service life of the one-way valve 10 is further prolonged. It should be noted that the inner portion 1516 and the outer portion 1517 are two portions of the outer member 1510, and are not two separate members.

The inner side portion 1516 is circular arc-shaped, and a central angle corresponding to the circular arc-shaped inner side portion 1516 is 240-300 degrees, namely theta 1 is 60-120 degrees. Since the first arm 1540 and the second arm 1570 need to be compressed to be close to each other during the assembly process of the retainer ring 1500, when the angle θ 1 is too small, even if the first arm 1540 and the second arm 1570 are close to each other (contact), the retainer ring 1500 cannot be smoothly assembled into the valve body 1100, and if the angle θ 1 is too large, the force required for deformation during the assembly process of the retainer ring 1500 is increased, and the deformation amount of the retainer ring 1500 is not easily controlled, so that the retainer ring 1500 cannot be smoothly rebounded due to too large deformation amount, thereby affecting the limiting effect.

In this embodiment, an outer circumference of a portion of the inner member 1520 between the first arm 1540 and the third arm 1530 is formed in a circular arc shape, an outer circumference of a portion of the inner member 1520 between the second arm 1570 and the third arm 1630 is formed in a circular arc shape, the first section 1541 and the second section 1571 are formed in a circular arc section, the first section 1541 is connected to the inner member 1520 in a circular arc shape, the second section 1571 is connected to the inner member 1520 in a circular arc shape, a bent portion is provided between a portion of the first arm 1540 excluding the first section 1541 and the first section 1541, a bent portion is provided between a portion of the second arm 1570 excluding the second section 1571 and the second section 1571, a center line between the first arm 1540 and the second arm 1540 is a line of symmetry, starting from a connection portion of the first section 1541571, the second section 1571 and the inner member 1520, the first and second segments 1541, 1571 are closer to the line of symmetry, and the remaining portions of the first arm 1540 other than the first segment 1541 and the remaining portions of the second arm 1570 other than the second segment 1571 radiate away from the line of symmetry, such that the first and second segments 1541, 1571 provide a deforming force when the first and second arms 1540, 1570 are compressed, and the first and second segments 1541, 1571 may be closer to the center of the inner member 1520, such that the first and second ends 1511, 1513 are closer to facilitate the installation of the retainer ring 1500 into the valve body 1100.

Of course, in other embodiments, the first arm 1540 may be in a linear form, and the second arm 1570 may be in a linear form, that is, the first segment 1541 and the rest of the first arm 1540 except for the first segment 1541 are disposed along a straight line, and the second segment 1571 and the rest of the second arm 1570 except for the second segment 1571 are disposed along a straight line.

The inner member 1520 includes a through hole 1512, the inner member 1520 includes a protruding portion 1580, the protruding portion 1580 is located between the first arm 1540 and the second arm 1570, the protruding portion 1580 is located at the periphery of the through hole 1512, the protruding portion 1580 protrudes toward the opening between the first arm 1540 and the second arm 1570, a gap is left between the protruding portion 1580 and the first arm 1540, and a gap is left between the protruding portion 1580 and the second arm 1570, so that when the first arm 1540 and the second arm 1570 are compressed, the first arm 1540 and the second arm 1570 are not interfered by the protruding portion 1580, and the first arm 1540 and the second arm 1570 are ensured to be compressed into place. One end of the rod portion 1230 extends into the through hole 1512, the spring 1400 is sleeved on the rod portion 1230, one end of the spring 1400 abuts against the inner member 1520, and at least a portion of the spring 1400 abuts against the projection 1580, so that when the rod portion 1230 moves in the axial direction of the valve body, the spring 1400 has a plurality of support points in the circumferential direction, which helps the spring 1230 provide stable elastic force to the rod portion 1230.

The shape of the through hole 1512 is matched with the cross-sectional shape of the rod portion 1230, and the through hole is in sliding fit or clearance fit with the rod portion. The rod portion 1230 is shaped like a multi-petal, the through hole 1512 is shaped like a combination of a fan and a square, the fan and the square are partially overlapped, the fan and the square have the same symmetry axis, and the fan angle θ 2 is 120 °. The square shape includes a case where a certain side is curved so as to fit the sectional shape of the rod portion 1230. The shape of the through-hole can effectively increase the cross-sectional flow area of the fluid through the baffle 1500.

When the retainer ring 1500 is assembled into the check valve 10 by using the circlip pliers, two jaws of the circlip pliers are placed into the first hole 1590 and the second hole 1560, the first hole 1590 and the second hole 1560 are forced to approach, meanwhile, the first end portion 1511 and the second end portion 1513 approach each other, but the first arm 1540 and the second arm 1570 are not in contact with the protruding portion, at this time, the outer part 1510 is deformed to reduce the whole retainer ring 1500 to be capable of entering the valve cavity 1110 to the groove 1126, the circlip pliers are released, and the retainer ring 1500 is elastically clamped in the groove 1126 to realize the limiting effect on the valve core.

It should be noted that: the expressions in the above embodiments with respect to "first", "second", "third", etc. are merely for naming purposes and do not include any sequential limitations. Although the present invention has been described in detail with reference to the above-mentioned 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.