CN209196181U - A kind of check valve - Google Patents

Abstract

A kind of check valve, the check valve includes valve body and core assembly, the valve body includes the first wall, the core assembly includes spool and sealing ring, the spool includes recess portion, the at least part of the sealing ring is located in the recess portion, and the sealing ring at least separately has part and the first wall gluing, sealing.Such check valve has the advantages that good seal performance.

Description

A kind of check valve

Technical field

The utility model relates to fluid control technology fields.

Background technique

Check valve is a kind of valve body machinery for making fluid along valve body inlet inflow, valve outlet outflow, for preventing fluid Adverse current.

In refrigeration system such as air-conditioning system, check valve is one of common building block, and if the interior leakage of check valve, can It can have a certain impact to the runnability of air-conditioning system.

Check valve as shown in Figure 1, including valve body 1, core assembly 2, spring 3 and retaining ring 4.Core assembly 2 includes living Plug assembly 5, Guide column component 6 and seal member 7, check valve include entrance 8, and piston component 5 can be axially moved along valve body, can Realize the function of opening valve port and close port.The seal form of core assembly 2 and valve body 1 is the gold of seal member 7 and processing Belong to the sealing means that sealing surface 9 presses, interior leakage performance is poor.

Utility model content

In order to solve the above technical problems, the technical solution of the utility model provides a kind of check valve.

A kind of check valve, including valve body, core assembly and entrance, the valve body include the first wall, and the valve body is provided with Corresponding first chamber of first wall, first wall include first position and second position, and the first position is opposite to be leaned on The nearly entrance, the second position are relatively distant from the entrance, and the first position is to the second position in a manner of expanding Setting；The core assembly includes spool and sealing ring, and at least part of the spool is located at first chamber, the spool Including valve core head, the valve core head includes recess portion, and at least part of the sealing ring is located at the recess portion, when the check valve When in sealing state, the sealing ring at least separately has part be bonded with first wall, and the position of fitting is positioned at described the Between one position and the second position.

The technical solution of the utility model is sealed in such a way that sealing ring is close to close with the first wall pressure, this structure Setting has preferable sealing performance, promotes the reliability of check valve.

Detailed description of the invention

Fig. 1 is existing check valve diagrammatic cross-section.

Fig. 2 is the check valve diagrammatic cross-section of one embodiment of the utility model.

Fig. 3 is the valve body diagrammatic cross-section of check valve shown in Fig. 2.

Fig. 4 is the partial enlarged view of check valve diagrammatic cross-section shown in Fig. 2.

Fig. 5 is the spool diagrammatic cross-section of check valve shown in Fig. 2.

Fig. 6 is and the consistent inner elements of check valve diagrammatic cross-section of Fig. 5.

Fig. 7 is the spool stereoscopic schematic diagram with the consistent check valve of Fig. 5.

Fig. 8 is the retaining ring structural schematic diagram of check valve shown in Fig. 2.

Fig. 9 is the check valve diagrammatic cross-section of another embodiment of the utility model.

Figure 10 is the valve body diagrammatic cross-section of check valve shown in Fig. 9.

Figure 11 is the partial enlarged view of check valve diagrammatic cross-section shown in Fig. 9.

Specific embodiment

Specific embodiment is described in detail referring now to the drawings.In order to fully understand the present invention, it mentions in the following detailed description Numerous details are arrived.It will be appreciated by those skilled in the art that in the accompanying drawings diagram and it is specific group described herein Part, device and feature are only exemplary and are not construed as limiting.

The axial direction or axis direction of this specification valve body refer to the axial direction for the valve chamber that the valve body includes, or Person is the direction same or parallel with valve chamber axis direction, as shown in Fig. 2 chain lines.

In this specification, inwardly refer to towards valve core axis direction, refers to outward towards spool peripheral direction.

Specific embodiment 1.

Fig. 2 illustrates a kind of check valve 10, the check valve 10 include valve body 1100, core assembly, spring 1400 and Retaining ring 1500, core assembly are mounted on valve inner, and core assembly includes spool 1200, sealing ring 1300.

The retaining ring 1500 and the valve body 1100 limit setting or fixed setting, the retaining ring 1500 include through-hole 1550, the spool 1200 is extending at least partially into the through-hole 1550, and the spring 1400 is sheathed on the spool 1200 Part-structure, and 1400 one end of the spring is abutted against with retaining ring 1500, in this way, the spool 1200 is transported along valve body axial direction It is dynamic.

It please refers to shown in Fig. 3, the valve body 1100 includes valve body wall 1120, and the valve body 1100 includes valve chamber 1110, institute It states valve chamber 1110 to be correspondingly arranged with the valve body wall 1120, the core assembly is located at the valve chamber 1110.

Direction flows into the flow direction of the check valve 10 as forward direction to fluid as shown by the arrows in figure 2, defines the check valve 10 and flows It is entrance 1600 that fluid, which flows into the openning of check valve valve body, when body flow direction is positive.

The valve body wall 1120 includes at least the first wall 1123, the second wall 1122, third wall 1121, the 4th wall 1124, the Five walls 1125.Second wall 1122 is between the third wall 1121 and the 5th wall 1125, first wall 1123 Positioned at second wall 1122 and the 5th wall 1125 between, the 4th wall 1124 be located at first wall 1123 with Between 5th wall 1125, relatively described first wall 1123 of second wall 1122 is closer to the entrance 1600.

The valve chamber 1110 includes at least the first chamber 1113, the second chamber 1112, third chamber 1111, the 4th chamber the 1114, the 5th Chamber 1115.

First chamber 1113 is corresponding with first wall 1123, second chamber 1112 and 1122 phase of the second wall Corresponding, the third chamber 1111 is corresponding with the third wall 1121, and the 4th chamber 1114 is opposite with the 4th wall 1124 It answers, the 5th chamber 1114 is corresponding with the 5th wall 1124.

Connection of the third chamber 1111 for the check valve 10 and external structure, the 5th chamber 1115 are used for institute State the connection of check valve 10 Yu external structure.

Second chamber 1112 is 1-5mm along the length of valve chamber axis direction, makes the second chamber described in the check valve 10 1112 corresponding second walls 1122 meet intensity requirement, prevent under operting differential pressure since intensity not enough leads to the second wall 1122 and first wall 1123 deform.

As shown in figure 3, the diameter D1 of the third wall 1121 and the difference range of the diameter D2 of second wall 1122 are 5mm-10mm.Such size design is conducive to the connection of the check valve 10 and inlet duct.

The groove 1126 being recessed there are one to wall surface between 4th wall 1124 and the 5th wall 1125.Retaining ring 1500 are located at the groove 1126.

The minimum diameter of first wall 1123 is greater than or equal to the diameter of second wall 1122.

First wall 1123 enters described in having the first position 11231 of the relatively close entrance 1600 and being relatively distant from The second position 11232 of mouth 1600, the first position 11231, second position 11232 are along the axial direction side of the valve body 1100 To arrangement, first wall is arranged in a manner of expanding from the first position 11231 to the second position 11232.

First wall 1123 can be a surface of revolution, and the definition of surface of revolution is a line around plane where it A upper fixed straight line rotates a circle curved surface generated.The surface roughness of first wall 1123 is less than 1.6.Described first The warp of wall 1123 is straight line, and the angle theta 1 of the longitudinal center line of the warp and the valve chamber 1110 is 15-45 °.Certainly, Warp may be curve and broken line.It is pointed out here that first position 11231 and second position 11232 be not limited to it is attached Pointed location in figure can be a portion in the first wall 1123, can make corresponding adjustment according to the actual situation, In addition, in the present embodiment the first wall 1123 be precisely first position 11231, second position 11232 and its between part, in order to Convenient for explanation, with the first wall 1123 indicates first position 11231, second position 11232 and its between part, and practical correspondence Be first position 11231, second position 11232 and its between part.

As shown in figure 5, the spool 1200 includes valve core head 1210, fin 1220 and stem 1230.The fin 1220 with the relatively described valve core head 1210 of the stem 1230 far from the entrance 1600, such setting can make described convex Rib 1220 and the stem 1230 do not influence the entrance of the check valve 10, and the influence for flow resistance is smaller.It is described rod-shaped Portion 1230 is located at the valve core head 1210 backwards to the side of the Way in, and the fin 1220 is from the valve core head 1210 Radial protrusion, the relatively described stem 1230 of the fin 1220 is closer to first wall 1123.

The fin 1220 is two or more, and two and fin 1220 described above interval are uniformly distributed setting, Fin described in embodiment attached drawing is three, and the fin 1220 has arc-shaped end face.The arc-shaped end face and described the Four walls, 1124 clearance fit is slidably matched, and the fin 1220 has guiding role.The arc-shaped end face and the described 4th Gap between wall 1124 is 0.1 mm-0.6mm, be both avoided that when the valve core head 1210 movement the fin 1220 with it is described The excessive cracking pressure for leading to the check valve 10 of friction pressure between 4th wall 1124 is excessive, and can make the fin 1220 Guiding have larger stability.

The valve core head 1210 has ring part 1250, and the fin 1220 is protruded from the ring part 1250 to be arranged, institute Stating has pit 1260 in the middle part of ring part 1250, the pit 1260, and the spool are protruded into one end of the stem 1230 1200 are wholely set.

The spring 1400 is sheathed in the stem 1230, and 1400 one end of the spring and the pit 1260 Bottom wall contact, this structure setting can make the spool 1200 when being located at maximum stroke the spring 1400 be still within bullet In property limit, the spool 1200 be located at maximum stroke refer to the spool 1200 during exercise with 1600 distance of entrance The location of when farthest.The other end of the spring 1400 offsets with the retaining ring 1500.

The guiding role and the stem 1230 of the fin 1220 and the cooperation of the 4th wall 1124 cooperate with the retaining ring Guiding role make the movement of the check valve 10 valve core head 1210 at work more steady, make indirectly described unidirectional The sealing performance of valve 10 is more preferable.

The stem 1230 can unanimously be realized for cross-sectional uniformity, can also be divided into several sections of inconsistent realities of cross section It is existing.By taking the stem 1230 is divided to for two sections as an example, the stem 1230 includes first part 1231 and second part 1232, The equivalent outer diameter of the second part 1232 is less than the equivalent outer diameter of the first part 1231, and the first part 1231 protrudes out In the ring part, a part of the second part 1232 protrudes into the through-hole 1550.The second part 1232 is along described The cross sectional shape of 1100 radial direction of valve body can be to be round or non-circular, the shape of the through-hole 1550 and the cross sectional shape It is adapted.When the cross sectional shape is non-circular, valve core rotation can be effectively prevented, in addition the second part 1232 is worked as Measure the internal diameter that outer diameter is less than the spring 1400.The stem 1230 is matched with the retaining ring 1500 is combined into the valve core head 1210 Motion guide.Particularly, the cross-sectional shape of the stem 1230 is multilateral shape or multi-petal shape shape.

The valve core head 1210 includes flaring portion 1211, recess portion 1212, and the recess portion 1212 is located at the ring part 1250 Between the flaring portion 1211.The ring part 1250 compares the flaring portion 1211 closer to fin 1220.The recess portion 1212 include peripheral wall 12111 close to the flaring portion 1211, the flaring portion 1211, and the bottom wall of the recess portion 1212 is with respect to institute The retraction of peripheral wall 12111 is stated, the sealing ring 1300 is at least partially disposed in the recess portion 1212.The flaring portion 1211 is in direction The outer diameter in the direction of the recess portion, the flaring portion 1211 is gradually increased.

The sealing ring 1300 can be O-ring, or can be include main body be O-shaped sealing ring.

The internal diameter of the sealing ring 1300 in the pre-assembly is less than the diameter D3 of the recess portion 1212, so that described after assembly Sealing ring 1300 has pretightning force, can more preferably depend in recess portion 1212, not easily to fall off or landing.

At least part of the peripheral wall 12111 and first wall 1123 is correspondingly arranged, and the peripheral wall 12111 is one A surface of revolution.The peripheral wall 12111 can be at least part face contact of first wall 1123.Pass through the peripheral wall 12111 can play a supporting role with being equipped with for first wall 1123, prevent 1300 excess compression of sealing ring and damage, It improves service life.

The surface roughness of the peripheral wall 12111 is less than 1.6, the peripheral wall 12111 described in this way and first wall 1123 Sealing can be played the role of by being equipped with.By dual-seal, interior leakage quantity can reduce

It is to define the recess portion 12121 on rear side of recess portion that the recess portion 1212, which is defined, close to the side wall of the ring part 1250 1212 side wall close to the flaring portion 1211 is 12122 on front side of recess portion.On front side of the recess portion on rear side of the 12122 relatively described recess portions 12121 close to the entrance.Before the 12121 relatively described recess portions on rear side of the radial direction of the valve core head 1210, the recess portion It protrudes side 12122.So that the sealing ring that the recess portion 1212 is placed is not easily to fall off under the different working condition of check valve, help In the service life for improving valve and provide stable sealing performance.

The radial direction for defining the spool 1200 is depth direction, the recess portion front side 12122 and the recess portion rear side 12122 distance is groove width w1, and the depth h1 of the recess portion rear side 12121 is 1.4-1.8mm, the 1212 groove width w1 of recess portion For 1.8-2mm.

The valve core head 1210 includes spool top surface 12112, and the rest part of the spool is respectively positioned on the same of spool top surface Side.The diameter for defining the spool top surface 12112 is the diameter of a circle of spool top surface outermost.

12112 diameter of spool top surface is greater than the minimum in first the wall 1123 in axial direction diameter of each position Diameter, in this way setting can guarantee there is large contact area when the peripheral wall 12111 is abutted against with first wall 1123, And the spool top surface 12112 is not contacted with first wall 1123.First wall 1123 in axial direction each position Diameter refers to the corresponding plane perpendicular to axis in position diameter of a circle corresponding with the intersection of first wall 1123.

When the spring 1400 is under initial elasticity deformation, the check valve 10 each component under initial tension of spring effect Position as shown in Fig. 2, the partial enlarged view of Fig. 2 is as shown in Figure 4.At this point, the peripheral wall 12111 and first wall 1123 Part, which offsets, provides support force, and the part of the sealing ring 1300 and first wall 1123, which fits, realizes sealing, described recessed 12121 do not contact with first wall 1123 on rear side of portion.Here initial elasticity deformation refer to product unused state (or go out Factory's state) under when, spring is in the deformation generated under compressive state

In a further embodiment, described unidirectional when the check valve 10 has the buffer brake for being greater than some threshold value The position of each component of valve 10 is as shown in Figure 2.The offer branch at this point, the part of the peripheral wall 12111 and first wall 1123 offsets Support force, can limit the actuating length of spool, the part of the sealing ring 1300 and first wall 1123 fit realize it is close Envelope, the recess portion rear side 12121 is not contacted with first wall 1123, at this point, the deflection of the sealing ring 1300 is preparatory In the normal range (NR) of estimation, the maximum deformation quantity of the sealing ring 1300 is controlled.

The bonding position when sealing ring 1300 is bonded with first wall 1123 be located at the first position 11231 with Between the second position 11232.The position that the peripheral wall 12111 in the flaring portion and first wall 1123 offset is located at described Between first position 11231 and the second position 11232.

This structure setting sealing ring 1300 when can make the valve core head 1210 with first wall 1123 sealing Deflection in the normal deformation range of sealing ring, avoid the sealing ring 1300 because deform it is excessive caused by the sealing ring The too short phenomenon of 1300 service lifes, and can make check valve that there is preferable sealing performance, prevent the interior leakage of check valve.

The peripheral wall 12111 is 1-1.2mm through line length L1, both can guarantee the peripheral wall 12111 and first wall 1123 intensity required for the spool 1200 when abutting against, but fluid flows through when the check valve 10 can be made in the open state The pressure difference of 10 front and back of check valve is smaller, is also unlikely to that the cracking pressure of the check valve 10 is made to lead to very much the check valve greatly 10 fail to open.The peripheral wall 12111 through line length be less than first wall 1123 through line length.

As described in Figure 8, retaining ring 1500 includes exterior part 1510, inner part 1520, the exterior part 1510 and the inside Part 1520 is connect by first arm 1540 with two the second arms 1530, and every first arm includes thin segment 1570, described The width of thin segment 1570 is 0.3-1mm.The inner part 1520 includes through-hole 1550.First arm 1540 and the exterior part There are hole 1560 in 1510 junctions.

The retaining ring 1500 limits the stem 1230, and the through-hole 1550 is matched with the stem 1230 to be combined into The motion guide of the spool 1200.The concrete shape of the through-hole 1550 is related with the concrete shape of the stem 1230, And the shape of the through-hole 1550 must satisfy to cooperate with the stem 1230 and be reached for the spool 1200 stabilization and lead To effect.

Specific embodiment 2.

Fig. 9 illustrates a kind of check valve 20, the check valve 20 include valve body 2100, core assembly, spring 1400 and Retaining ring 1500, core assembly are mounted on valve inner, and core assembly includes spool 1200, sealing ring 1300.The retaining ring 1500 Setting or fixed setting are limited with the valve body 2100.In this embodiment, unaccounted details can be with reference to specific implementation Example 1.

It please referring to shown in Figure 10, the valve body 2100 includes valve body wall 2120, and the valve body 2100 includes valve chamber 2110, The valve chamber 2110 is correspondingly arranged with the valve body wall 2120, and core assembly is located at the valve chamber 2110.

Direction flows into the flow direction of the check valve 20 as forward direction to fluid as shown by the arrows in figure 8, defines the check valve 20 and flows It is entrance 2600 that fluid, which flows into the openning of check valve valve body, when body flow direction is positive.

The valve body wall 2120 includes at least the first wall 2123, the second wall 2122, third wall 2121, the 4th wall 2124, the Five walls 2125.Second wall 2122 is between the third wall 2121 and the 5th wall 2125, first wall 2123 Positioned at second wall 2122 and the 5th wall 2125 between, the 4th wall 2124 be located at first wall 2123 with Between 5th wall 2125, relatively described first wall 2123 of second wall 2122 is closer to the entrance 2600.

The valve chamber 2110 includes at least the first chamber 2113, the second chamber 2112.

First chamber 2113 is corresponding with first wall 2123, second chamber 2112 and 2122 phase of the second wall It is corresponding.

First chamber 2113 is being greater than second chamber 2112 with the diameter at 2112 connecting part of the second chamber Diameter, therefore step 2127 is formed with 2122 joint of the second wall in first wall 2123, here it should be noted that step 2127 be a part of the first wall 2123, it can thinks that step 2127 is bottom wall corresponding to 2113 bottom of the first chamber.

First wall 2123 enters described in having the first position 21231 of the relatively close entrance 2600 and being relatively distant from The second position 21232 of mouth 2600, the first position 21231, second position 21232 are along the axial direction side of the valve body 2100 To arrangement, first wall 2123 is extended from the first position 21231 to the second position 21232 in expanding mode.

It is partially a surface of revolution, the definition of surface of revolution between the first part 21231 and second part 21232 For a line, around its institute, a fixed straight line rotates a circle curved surface generated in the plane.First part 21231 and second The surface roughness of part is less than 1.6 between part 21232.Part between the first position 21231 and second position 21232 Warp be straight line, the angle theta 2 of the longitudinal center line of the warp and the valve chamber 2100 is 15-45 °.Certainly, warp with can Think curve and broken line.

Please refer to Fig. 5, Fig. 6 and Fig. 7, if what the spool 1200 did not illustrated in this particular embodiment, indicate with Spool in specific embodiment 1 is consistent, in the following description, will be carried out using the mark of correlation in specific embodiment 1, there is spy The bright explanation by this embodiment is not mentionleted alone.

The spool top surface 12112 is correspondingly arranged with the step 2127.The spool top surface 12112 can be one Plane, spool top surface is a plane in the present embodiment.

12112 diameter of spool top surface is less than or equal to part between first part 21231 and second part 21232 The in axial direction minimum diameter in the diameter of each position, in this way setting can guarantee the first position 21231 and second Part is not directly contacted with the peripheral wall 12111 between position 21232, while the spool top surface 12112 and the step 2127 It abuts against.Partially in axial direction the diameter of each position refers to this between the first position 21231 and second position 21232 The intersection pair of part between the corresponding plane and the first position 21231 and second position 21232 perpendicular to axis in position The diameter of a circle answered.

When the 20 both ends Fluid pressure of check valve is equal, the check valve 20 each component under initial tension of spring effect Position as shown in figure 9, the partial enlarged view of Fig. 9 is as shown in figure 11.At this point, the spool top surface 12112 at least partly with The step 2127, which offsets, provides support force, the sealing ring 1300 and the first position 21231 and second position 21232 it Between partially fit realization sealing, on rear side of the recess portion between 12121 and the first position 21231 and second position 21232 Part does not contact.

In a further embodiment, described unidirectional when the check valve 20 has the buffer brake for being greater than some threshold value The position of each component of valve 20 is as shown in Figure 9.At this point, the spool top surface 12112 at least partly offsets with the step 2127 Support force is provided, partially fit realization between the sealing ring 1300 and the first position 21231 and second position 21232 Sealing, the recess portion rear side 12121 are not contacted with part between the first position 21231 and second position 21232, at this point, The deflection of the sealing ring 1300 controls the maximum distortion of the sealing ring 1300 in the normal range (NR) pre-estimated Amount.

This structure setting can make the valve core head 1210 and the first position 21231 and second position 21232 it Between when partially sealing the sealing ring 1300 deflection in the normal deformation range of sealing ring, avoid the sealing ring 1300 Because deform it is excessive caused by the too short phenomenon of 1300 service life of sealing ring, and can make check valve that there is preferable leakproofness Can, prevent the interior leakage of check valve.Here it should be noted that partially including between first position 21231 and second position 21232 One position 21231 and second position 21232.

It should be understood that about the similar statement such as " first ", " second ", " third " being only to be in above embodiments Name, does not include the restriction of any sequence.Above embodiments are merely to illustrate the present invention and not limit described in the invention Technical solution, although the present invention has been described in detail referring to the above embodiments for this specification, this field It is to be appreciated by one skilled in the art that person of ordinary skill in the field still can modify to the present invention or equivalent Replacement, and all do not depart from the technical solution and its improvement of the spirit and scope of the present invention, should all cover in right of the invention In claimed range.

Claims (10)

1. a kind of check valve, including valve body, core assembly and entrance, which is characterized in that the valve body includes the first wall, the valve Body is provided with corresponding first chamber of first wall, and first wall includes first position and second position, and described first The relatively close entrance in position, the second position are relatively distant from the entrance, the first position to the second position with Expanding mode is arranged；

The core assembly includes spool and sealing ring, and at least part of the spool is located at first chamber, the spool Including valve core head, the valve core head includes recess portion, and at least part of the sealing ring is located at the recess portion, when the check valve When in sealing state, the sealing ring at least separately has part be bonded with first wall, and the position of fitting is positioned at described the Between one position and the second position.

2. check valve according to claim 1, which is characterized in that the check valve includes spring, and the valve core head includes Flaring portion, the outer diameter in the direction towards the recess portion, the flaring portion are gradually increased, the peripheral wall in the flaring portion and described the At least part between the first position and second position of one wall matches, when the valve core head and first wall abut against When, the peripheral wall in the flaring portion is abutted against with first wall, and the position of abutting is located at the first position and described second Between position, the spring is in compressive state.

3. check valve according to claim 1, which is characterized in that the check valve includes spring, and the valve body is also set up Have the second chamber, the valve body wall further includes the second wall corresponding with second chamber, first chamber with second chamber Diameter at connecting part is greater than the diameter of second chamber, therefore forms platform in first wall and second wall joint Rank；The spool includes spool top surface, and the diameter of the spool top surface is greater than the diameter of second chamber, the spool top surface Diameter is less than or equal to the minimum diameter of first chamber, when the valve core head is abutted against with first wall, the spool Top surface is abutted against with the step, and the spring is in compressive state.

4. check valve according to any one of claims 1 to 3, which is characterized in that the recess portion include on rear side of recess portion with it is recessed It is described in the radial direction of the core assembly close to the entrance on rear side of the relatively described recess portion on front side of the recess portion on front side of portion Protrusion on front side of the relatively described recess portion on rear side of recess portion, the recess portion rear side are not contacted with first wall, the depth on rear side of the recess portion Degree is 1.4-1.8mm, and the width of the recess portion is 1.8-2mm.

5. check valve according to claim 1 or 3, which is characterized in that first wall is surface of revolution, first wall Warp and the angle of longitudinal center line of first chamber be 15-45 °, the surface roughness of first wall is less than 1.6.

6. check valve according to claim 2, which is characterized in that first wall is surface of revolution, first wall The angle of the longitudinal center line of warp and first chamber is 15-45 °, and the surface roughness of first wall is less than 1.6.

7. check valve according to claim 4, which is characterized in that first wall is surface of revolution, first wall The angle of the longitudinal center line of warp and first chamber is 15-45 °, and the surface roughness of first wall is less than 1.6.

8. check valve according to claim 6, which is characterized in that the peripheral wall in the flaring portion is surface of revolution, the week Wall through line length be 1-1.2mm, the peripheral wall in the flaring portion through line length be less than first wall through line length.

9. check valve according to claim 1, which is characterized in that the check valve includes spring, and the valve core head includes Flaring portion, the outer diameter in the direction towards the recess portion, the flaring portion are gradually increased, the peripheral wall in the flaring portion and described the At least part between the first position and second position of one wall matches, when the valve core head and first wall abut against When, the peripheral wall in the flaring portion is abutted against with first wall, and the position of abutting is located at the first position and described second Between position, the spring is in compressive state；

The recess portion includes the close entrance on rear side of the relatively described recess portion on front side of the recess portion on front side of recess portion rear side and recess portion, In the radial direction of the core assembly, protrusion on front side of the relatively described recess portion on rear side of the recess portion, on rear side of the recess portion with it is described First wall does not contact, and the depth on rear side of the recess portion is 1.4-1.8mm, and the width of the recess portion is 1.8-2mm；

First wall is surface of revolution, and the warp of first wall and the angle of the longitudinal center line of first chamber are 15- 45 °, the surface roughness of first wall is less than 1.6；

The peripheral wall in the flaring portion is surface of revolution, and the peripheral wall is 1-1.2mm through line length, the peripheral wall in the flaring portion Through line length less than first wall through line length；

The valve body is additionally provided with the second chamber, and the valve body wall further includes the second wall corresponding with second chamber, the valve Body wall includes third wall, and second wall is between first wall and the third wall, the diameter of the third wall and institute The difference range for stating the diameter of the second wall is 5mm-10mm.

10. check valve according to claim 1, which is characterized in that the check valve includes spring, and the valve body is also set up Have the second chamber, the valve body wall further includes the second wall corresponding with second chamber, first chamber with second chamber Diameter at connecting part is greater than the diameter of second chamber, therefore forms platform in first wall and second wall joint Rank；The spool includes spool top surface, and the diameter of the spool top surface is greater than the diameter of second chamber, the spool top surface Diameter is less than or equal to the minimum diameter of first chamber, when the valve core head is abutted against with first wall, the spool Top surface is abutted against with the step, and the spring is in compressive state；

The recess portion includes the close entrance on rear side of the relatively described recess portion on front side of the recess portion on front side of recess portion rear side and recess portion, In the radial direction of the core assembly, protrusion on front side of the relatively described recess portion on rear side of the recess portion, on rear side of the recess portion with it is described First wall does not contact, and the depth on rear side of the recess portion is 1.4-1.8mm, and the width of the recess portion is 1.8-2mm；

First wall is surface of revolution, and the warp of first wall and the angle of the longitudinal center line of first chamber are 15- 45 °, the surface roughness of first wall is less than 1.6；

The valve core head includes flaring portion, and the peripheral wall in the flaring portion is surface of revolution, and the peripheral wall is 1- through line length 1.2mm, the peripheral wall in the flaring portion through line length be less than first wall through line length；

The valve body wall includes third wall, and second wall is between first wall and the third wall, the third wall Diameter and second wall diameter difference range be 5mm-10mm.