阅读说明：本技术 一种流量控制阀 (Flow control valve ) 是由 不公告发明人 于 2019-09-20 设计创作，主要内容包括：本发明公开了一种流量控制阀,包括阀体部件及阀芯部件,阀体部件包括密封座部件、密封环、第一流体端口和第二流体端口,密封座部件包括密封座和与密封座限位连接的密封部件,密封部件的内缘与阀芯部件抵接,当密封部与密封环抵接时,密封部包括密封内缘环线和密封外缘环线,本体部的外缘在密封环的垂直方向的投影环线位于密封内缘环线与密封外缘环线之间；定义密封内缘环线与投影环线之间形成内环形面,内环形面的面积为S-(内’),定义密封外缘环线与投影环线之间形成外环形面,外环形面的面积为S-(外’),则S-(外’)＝S-(内’),流体正向进入或反向进入,均能改善闭阀状态下流量控制阀的内泄漏。(The invention discloses a flow control valve, which comprises a valve body component and a valve core component, wherein the valve body component comprises a seal seat component, a seal ring, a first fluid port and a second fluid port; defining an inner annular surface formed between the annular line of the inner edge of the seal and the projected annular line, the area of the inner annular surface being S Inner liner' Defining an outer annular surface formed between the outer edge loop and the projected loopHas an area of S Outside' Then S is Outside' ＝S Inner liner' And the fluid enters in the forward direction or the reverse direction, so that the internal leakage of the flow control valve in a closed valve state can be improved.)

1. A flow control valve comprises a valve body component and a valve core component, wherein the valve body component comprises a seal seat component, a seal ring, a first fluid port and a second fluid port, the seal seat component comprises a seal seat and a seal component in limit connection with the seal seat, the inner edge of the seal component is abutted against the valve core component, the valve core component comprises a valve core, the valve core comprises a body part and an expanding part arranged below the body part, the body part and the expanding part are approximately annular, the outer diameter of the expanding part is larger than that of the body part, the lower end of the expanding part comprises a seal part, and the valve core component can slide relative to the seal seat component to enable the seal part to be abutted against or separated from the seal ring;

the valve core component comprises a balance flow path, when the sealing part is abutted against the sealing ring, the flow control valve comprises a first cavity positioned on one side of the sealing component and a second cavity arranged on the valve core, the second cavity is communicated with the first fluid port, and the first cavity is communicated with the second cavity through the balance flow path; when the sealing part is abutted against the sealing ring, the sealing part comprises a sealing inner edge annular line and a sealing outer edge annular line, and a projection annular line of the outer edge of the body part in the vertical direction of the sealing ring is positioned between the sealing inner edge annular line and the sealing outer edge annular line; defining an inner annular surface formed between the sealing inner edge loop line and the projection loop line, wherein the area of the inner annular surface is S_{Inner liner'}Defining an outer annular surface formed between the outer edge loop and the projection loop, the outer annular surface having an area S_Outside'Then S is_Outside'＝S_{Inner liner'}。

2. The flow control valve according to claim 1, wherein the valve body further includes a transition portion, one end of the transition portion is connected to the body portion, the other end of the transition portion is connected to the diameter-enlarged portion, an outer wall of the transition portion is substantially in a slope shape, and an outer diameter of an upper end of the transition portion is smaller than an outer diameter of a lower end of the transition portion.

3. The flow control valve according to claim 1 or 2, wherein the diameter-enlarged portion includes a first section and a second section provided below the first section, an inner wall of the first section is provided with a substantially constant diameter, an outer wall of the first section is provided with a substantially constant diameter, an inner wall of the second section is provided with an inclined surface, and an inner diameter of an upper end of the inner wall of the second section is smaller than an inner diameter of a lower end of the inner wall of the second section.

4. The flow control valve according to claim 3, wherein the valve body member includes a valve body, a lower end of the seal holder extends into an inner cavity of the valve body, the seal holder is substantially cylindrical, the seal holder includes a limiting step portion with a downward step surface, the seal member is located at the limiting step portion, an outer edge of the seal member abuts against the seal holder, and an inner edge of the seal member abuts against an outer wall of the valve element.

5. The flow control valve of claim 3, wherein the valve body member includes a sealing ring seat having an inner bore, the sealing ring seat being disposed in the inner cavity of the valve body, the sealing ring being disposed in the sealing ring seat, the sealing ring being fixedly coupled to the sealing ring seat.

6. The flow control valve according to claim 5, wherein the flow control valve is an electronic expansion valve, the electronic expansion valve includes a transmission component, the transmission component includes a screw and a nut, the nut can drive the valve core component to move axially, an outer wall of the nut can be in clearance sliding fit with an inner wall of the guide hole of the seal seat, the valve body component further includes an adjuster, the adjuster is fixedly connected with the seal ring seat, and the valve core can move axially relative to an adjustment flow passage of the adjuster to adjust a flow area between the first fluid port and the second fluid port.

7. The flow control valve according to claim 6, characterized in that an inner diameter of the diameter-enlarged portion is larger than an inner diameter of the body portion, and the inner diameter of the diameter-enlarged portion is smaller than an outer diameter of the body portion; the valve body component further comprises a regulator fixedly connected with the sealing ring seat, and the valve core can move relative to a regulating flow passage of the regulator to regulate the flow area between the first fluid port and the second fluid port; the valve body member includes a lining portion having a substantially annular shape, and a minimum gap between an inner wall of the regulator and an outer wall of the diameter-enlarged portion is X₁' and the minimum clearance between the outer wall of the lining part and the inner wall of the expanding part is X₂', then X₁’﹤1mm，X₂’﹤1mm。

8. The flow control valve of claim 7, wherein the sealing ring seat includes an annular groove portion, the sealing ring is disposed in the annular groove portion, an inner wall of the annular groove portion extends axially upward to form the inner liner portion, an outer wall of the annular groove portion extends axially upward to form a fixed portion, and the lower end of the regulator includes a radial flange portion fixedly coupled to the fixed portion.

9. The flow control valve of claim 7, wherein X is₁’﹤0.3mm，X₂’﹤0.3mm。

10. The flow control valve according to any one of claims 1 to 3, wherein the spool member further includes a nut cover fitted with the nut, and a connecting member fixedly connected with the nut cover and the spool, the connecting member including a cylindrical portion and a plate-like portion, the plate-like portion including a flow blocking portion in the middle and a communication passage provided outside the flow blocking portion, the nut cover including an accommodating chamber, and the equilibrium flow passage including the accommodating chamber.

11. The flow control valve according to any one of claims 1 to 3, wherein the flow control valve is an electromagnetic valve, the electromagnetic valve comprises a control component, the control component comprises a static iron core and a movable iron core, and the movable iron core can drive the valve core component to move axially.

Technical Field

The invention relates to the technical field of fluid control, in particular to a flow control valve.

Background

In the field of fluid control technology, flow control valves are widely used, and generally comprise a fluid inlet, a fluid outlet, a valve port and a valve core. The valve core can move under the driving of the transmission component to be abutted against or separated from the valve port, so that the communication (opening) and disconnection (closing) of fluid between the fluid inlet and the fluid outlet are controlled or the flow rate between the fluid inlet and the fluid outlet is adjusted. In the flow control valve, improvement of internal leakage of the flow control valve in a closed state is one of the technical problems that the skilled person has tried to solve.

Disclosure of Invention

The invention provides a flow control valve, which can improve the internal leakage of the flow control valve in a closed state.

The invention provides a flow control valve, which comprises a valve body component and a valve core component, wherein the valve body component comprises a seal seat component, a seal ring, a first fluid port and a second fluid port, the seal seat component comprises a seal seat and a seal component in limit connection with the seal seat, the inner edge of the seal component is abutted against the valve core component, the valve core component comprises a valve core, the valve core comprises a body part and an expanding part arranged below the body part, the body part and the expanding part are approximately annular, the outer diameter of the expanding part is larger than that of the body part, the lower end of the expanding part comprises a seal part, and the valve core component can slide relative to the seal seat component to enable the seal part to be abutted against or separated from the seal ring;

the valve core component comprises a balance flow path, when the sealing part is abutted against the sealing ring, the flow control valve comprises a first cavity positioned on one side of the sealing component and a second cavity arranged on the valve core, the second cavity is communicated with the first fluid port, and the first cavity is communicated with the second cavity through the balance flow path; when the sealing part is abutted to the sealing ring, the sealing part comprises a sealing inner edge annular line and a sealing outer edge annular line, and a projection annular line of the outer edge of the body part in the vertical direction of the sealing ring is positioned between the sealing inner edge annular line and the sealing outer edge annular line; defining an inner annular surface formed between the sealing inner edge annular line and the projection annular line, wherein the area of the inner annular surface is S_{Inner liner'}Defining an outer annular surface formed between the outer edge loop and the projection loop, the outer annular surface having an area S_Outside'Then S is_Outside'＝S_{Inner liner'}. The invention provides a flow control valve capable of improving internal leakage of the flow control valve in a closed state.

Drawings

Fig. 1 is a schematic structural diagram of a first flow control valve provided by the present invention in a closed state;

FIG. 2 is a schematic diagram illustrating an analysis of fluid pressure experienced by the spool assembly when the flow control valve is closed with fluid entering in the forward direction;

FIG. 3 is a schematic diagram illustrating analysis of fluid pressure experienced by the spool member when the flow control valve is closed;

FIG. 4 is a schematic view showing a relationship between a projected loop line of the outer edge of the main body of the valve element and a loop line of the inner and outer sealing edges of the valve element when the sealing portion abuts against the sealing ring in FIG. 1;

FIG. 5 is a schematic diagram of the regulator of FIG. 1;

FIG. 6 is an enlarged view of a portion of FIG. 1 at I;

FIG. 7 is a partial schematic view showing a first modification of the seal ring engaged with the valve body;

FIG. 8 is a partial schematic view showing a second modification of the seal ring engaged with the valve body;

FIG. 9 is a partial schematic view showing a third modification of the seal ring engaged with the valve body;

FIG. 10 is a partial schematic view showing a fourth modification of the seal ring engaged with the valve body;

fig. 11 is a schematic structural diagram of another flow control valve provided by the present invention.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

It should be noted here that the above description is only for the sake of clarity and convenience of the technical solution. It is to be understood that the directional terms used herein are not intended to limit the scope of the claims.

The "axial direction" mentioned herein refers to the axial direction of the seal seat, i.e. the O-O direction shown in fig. 1, and the "fixed connection" mentioned in this embodiment may be a direct fixed connection of two components, or may be a fixed connection of two components through other components, i.e. an indirect fixed connection of two components.

Fig. 1 is a schematic structural view of a first flow control valve provided by the present invention in a closed valve state, fig. 2 is a schematic structural view of a fluid entering in a forward direction, a schematic structural view of a fluid pressure applied to a valve core member when the flow control valve is closed, fig. 3 is a schematic structural view of a fluid entering in a reverse direction, a schematic structural view of a fluid pressure applied to the valve core member when the flow control valve is closed, fig. 4 is a schematic structural view of a relationship between a projection loop line of an outer edge of a body portion of the valve core at a sealing ring and a sealing inner edge loop line and a sealing outer edge loop line of the valve core when the sealing portion abuts against the sealing ring in fig. 1, fig. 5 is a schematic structural view of a regulator in fig. 1, and fig. 6 is a partially enlarged view.

As shown in fig. 1 and 2, the flow control valve of the present embodiment is specifically an electronic expansion valve, and includes a valve body component 10 ', a valve core component 30', a transmission component 40 'and a motor component 50'. The motor part 50 'is connected to the transmission part 40', which transmission part 40 'is in turn connected to the valve core part 30'. The transmission component 40 'can drive the valve core component 30' to move axially relative to the valve body component 10 'under the driving of the motor component 50'. Specifically, the transmission component 40 ' includes a screw 41 ' and a nut 42 ', and the nut 42 ' can drive the valve core component 30 ' to move axially.

The valve body part 10 'comprises a valve body 11', a sealing ring seat 12 'with an inner hole, a sealing ring 13', a sealing seat part 20 ', and the sealing ring seat 12' is formed by forging or finish turning after forging or is formed by bar stock turning. The sealing ring seat 12 'is arranged in the inner cavity of the valve body 11', the sealing ring 13 'is arranged on the sealing ring seat 12', and the sealing ring 13 'is fixedly connected with the sealing ring seat 12'. The valve core component 30 'can be abutted against or separated from the sealing ring 13', so that the sealing ring seat 12 'is a transition connection between the sealing ring 13' and the valve body 11 ', and the valve port part can be formed on the sealing ring seat 12', thereby reducing the requirement on the machining precision of the valve body component. When the sealing ring seat 12 'and the valve body 11' are separately arranged, it should be noted that the sealing ring seat 12 'is a component with a small volume and a simple structure relative to the valve body 11', and can be separately processed, is easy to process, has high precision, and is convenient for batch production. On the premise of simple process, the precision control is more facilitated. The valve port with high precision requirement is not machined on the valve body like the prior flow control valves. It is understood that, in the present embodiment, the valve port may be formed in the valve body 11.

The technical scheme can be applied to a one-way flow control valve and a two-way flow control valve, and particularly in the two-way flow control valve, the advantages or effects are more obvious. The term "bidirectional" means that the fluid can enter in the forward direction or in the reverse direction, wherein the forward direction means that the fluid can flow in from the second fluid port B 'and flow out from the first fluid port a' in the valve-open state when the valve is applied, and the reverse direction means that the fluid can flow in from the first fluid port a 'and flow out from the second fluid port B' in the valve-open state when the valve is applied.

The valve body 11 ' includes a first fluid port a ' and a second fluid port B '. The sealing seat member 20 ' includes a sealing seat 21 ' and a sealing member 32 ' connected to the sealing seat 21 ' in a limited manner, as shown in fig. 1, the lower portion of the sealing seat 21 ' is substantially cylindrical and extends into the valve body 11 ', the outer wall of the sealing seat 21 ' may be provided with external threads, the inner wall of the valve body 11 ' is provided with internal threads, the sealing seat 21 ' is fixed to the valve body by means of threaded connection, and a sealing ring is provided between the two for sealing. Or the sealing seat 21 ' can be welded and fixed with the valve body 11 ', or the lower end of the sealing seat 21 ' extends into the valve body 11 ', and then the sealing seat 21 ' is fixed through other parts.

The seal seat component 20 'further comprises a fixing block 25', the fixing block 25 'and the lower portion of the seal seat 21' are welded or riveted to form an annular accommodating groove with an opening facing the valve core component 30 'with the limiting step portion 211', and the seal component 32 'is axially limited in the annular accommodating groove and is in limiting connection with the seal seat 21'. The seal seat 21' may be formed integrally with the valve body 11, provided that the object of the present invention is achieved. The sealing member 32 ' includes a packing 321 ' and an elastic pad 322 '.

The valve body member 30 ' is disposed in the inner cavity of the valve body 11 ', the valve body member 30 ' includes a valve body 31 ', the valve body 31 ' includes a body portion 311 ' and an enlarged diameter portion 312 ' disposed below the body portion 311 ', the outer edges of the body portion 311 ' are substantially equal in diameter, the body portion 311 ' and the enlarged diameter portion 312 ' are substantially annular, and the outer diameter of the enlarged diameter portion 312 ' is larger than the outer diameter of the body portion 311 '. The lower end of the enlarged diameter portion 312 'includes a sealing portion 3121'. The spool member 30 'is axially slidable relative to the seal member 32' to bring the seal portion 3121 'into and out of abutment with the seal ring 13'.

The outer edge of the seal ring 321 ' abuts against the inner wall of the seal seat 21 ', and the inner wall of the elastic washer 322 ' abuts against the outer wall of the body 311 ' of the valve body 31 '. When the sealing portion 3121 'abuts against the sealing ring 13', the inner edge of the elastic washer 322 'abuts against the outer edge of the valve body member 30' to form a seal at the contact portion.

Between the valve core member 30 'and the seal seat 21' there are a first predetermined gap X 'on the lower side of the seal member 32' and a second predetermined gap Y 'on the upper side of the seal member 32'. The flow control valve includes a first chamber 1 'disposed at an upper side of the sealing member 32' and a second chamber 2 'disposed at the spool 31' to communicate with the first fluid port a ', the spool member 30' includes a balance flow path, the first chamber 1 'and the second chamber 2' communicate through the balance flow path, and the first chamber 1 'and the second fluid port B' do not communicate.

When the sealing portion 3121 'abuts against the sealing ring 13', the sealing portion 3121 'includes a sealing inner edge loop line N' and a sealing outer edge loop line Q 'which are matched with the sealing ring 13', a projected loop line M 'of the outer edge of the body portion 311' in the vertical direction of the sealing ring 13 'is located between the sealing inner edge loop line N' and the sealing outer edge loop line Q ', an inner annular surface 3121A' is formed between the sealing inner edge loop line N 'and the projected loop line M', and the area is S_{Inner liner'}An outer annular surface 3121B ' is formed between the sealing outer edge loop Q ' and the projection loop M ', and has an area S_Outside'. With this arrangement, as shown in fig. 2, when the fluid flows in the forward direction (i.e., flows in from the second fluid port B '), the sealing portion 3121' of the diameter-enlarged portion 312 'abuts against the sealing ring 13', and the flow rate control valve is in the closed state, the first chamber is closedThe body 1 'is a zero-pressure area, the second cavity 2' is communicated with the first cavity 1 'through a balance flow path, and the first cavity 1' is correspondingly provided with the zero-pressure area. However, the fluid pressure of the fluid acting on the seal member 32 ' at the first predetermined gap X ' on the lower side of the seal member 32 ' and the second predetermined gap Y ' on the upper side of the seal member 32 ' is not transmitted to the spool member 30 ' through the seal member 32 '. Only the portion of the enlarged diameter portion 312 ' of the spool member 30 ' located outside the seal ring line M ' receives the pressure P of the high-pressure fluid_{High outer}Is the area S of the outer annular surface 3121B_Outside'Generating a force F acting on the sealing ring 13' in a direction towards the sealing ring 13_{High external ↓}. The spool member 30' is subjected to a fluid pressure F_{Outer cover}＝F_{High external ↓}＝P_{High outer}·S_Outside'It is advantageous to improve the sealing reliability between the spool 31 'and the sealing ring 13' to improve the internal leakage of the flow control valve.

Similarly, fig. 3 is a schematic diagram illustrating a force analysis of the spool component when the fluid reversely enters. In this arrangement, as shown in fig. 1 and 3, when the fluid flows in the reverse direction (i.e., from the second fluid port a '), the sealing portion 3121' of the enlarged diameter portion 312 'abuts against the sealing ring 13' and the flow control valve is in the closed valve state, since the second chamber 2 'is a high pressure region, the first chamber 1' and the second chamber 2 'are communicated with each other through the equilibrium flow path, and the second chamber 1' is also correspondingly a high pressure region. The part of the enlarged diameter part 312 'located inside the seal ring line M' is subjected to the pressure P of the high-pressure fluid_{High inner}The force-bearing area is the area S of the inner annular surface 3121A_{Inner liner'}Generating a force F acting on the sealing ring 13' in a direction towards the sealing ring 13_{High inner ↓}. The spool part 3' 0 is subjected to a fluid pressure F_{Inner part}＝F_{High inner ↓}＝P_{High inner}·S_{Inner liner'}The sealing reliability between the valve core 31 'and the sealing ring 32' is improved, and the internal leakage of the flow control valve is improved.

It can be seen that, when fluid enters in the forward direction or the reverse direction, the valve core component 30 ' can receive the acting force which is applied by the fluid and faces the sealing ring 13 ' and is beneficial to the tight support between the valve core 31 ' and the sealing ring 32 ', so that the valve core component 30 ' can be beneficial to the matching of the valve core 31 ' and the sealing ring 13 ' in the valve closing state when the fluid enters in the forward direction or the reverse direction, and the internal leakage when the fluid enters in the forward direction or the reverse direction can be improved.

In order to ensure that the valve opening force required by the valve core component 30 ' has a small difference when fluid enters in the forward direction or the reverse direction under the same fluid pressure, namely the valve core component 30 ' has a small difference in fluid pressure, so that the forward and reverse movements of the valve core component 30 ' are relatively stable, the flow control valve of the scheme is designed with the S design_Outside'Is equal to S_{Inner liner'}When F is present_{Outer cover}＝P_{High outer}·S_Outside'，F_{Inner part}＝P_{High inner}·S _{Inner liner'}Then F is_{Outer cover}＝F_{Inner part}. Of course, it is understood that equality here may not be absolutely equal in an actual product, but only near equal.

In addition, due to the design of the enlarged diameter portion 312 'and the sealing portion 3121', the flow control valve of the present embodiment can also adjust the magnitude of the fluid pressure difference received by the valve core member 30 'by adjusting the area difference between the inner annular surface 3121A' and the outer annular surface 3121B 'of the valve core 31', without changing the structural dimensions of other components of the valve, and is beneficial to the standardization and serialization of parts during the production of the flow control valve.

Further, in order to reduce the resistance when the fluid flows and facilitate the valve closing, the valve body 31 further includes a transition portion 313 ', one end of the transition portion 313' is connected to the body portion 311 ', the other end of the transition portion 313' is connected to the enlarged diameter portion 312 ', the outer wall of the transition portion 313' is substantially in the shape of an oblique surface, and the outer diameter of the upper end of the transition portion 313 'is smaller than the outer diameter of the lower end of the transition portion 313'.

In a further embodiment, the enlarged diameter portion 312 'includes a first section 3122' and a second section 3123 'disposed below the first section, the inner wall of the first section 3122' is disposed in a substantially constant diameter, the outer wall of the first section 3122 'is disposed in a substantially constant diameter, the inner wall of the second section 3123' is disposed in an inclined plane shape, and the inner diameter of the upper end of the inner wall of the second section 3123 'is smaller than the inner diameter of the lower end of the inner wall of the second section 3123'. With this arrangement, when the valve needs to be opened, the shape of the second section 3123 'can facilitate the fluid to act on the valve body 31' to open the valve.

As shown in fig. 2, the valve core member 30 'includes a nut cover 36' fitted with the nut 42 ', a connection member 33' fixedly connected with the nut cover 36 'and the valve core 31', the connection member 33 'includes a cylindrical portion 331' and a plate portion 332 ', the plate portion 332' includes a middle flow blocking portion 3321 'and a communication passage 3322' provided outside the flow blocking portion 3321 ', the nut cover 36' includes a receiving chamber 361 ', and when the valve core 31' abuts against the sealing ring 13 ', the balance flow passage of the flow control valve includes a second chamber 2', a communication passage 3322 ', and a receiving chamber 361'. By providing the flow blocking portion 3321 ', when the valve element 31 is separated from the sealing ring 1 ' 3, the fluid entering from the second fluid port B ' will gather below the flow blocking portion 3321 ' to form a high pressure region, the flow blocking portion 3321 ' can at least partially prevent the high pressure fluid from directly rushing into the first cavity 1 ' on the upper side of the sealing member 32 ', so that the high pressure fluid is dispersed around at the position of the flow blocking portion 3321 ', the pressure will be reduced, and the reduced pressure fluid enters the first cavity 1 ' on the upper side of the sealing member 32 ' through the accommodating cavity 361 ', so that the downward fluid pressure applied to the valve element 30 ' can be reduced, the resistance when the valve element 30 ' moves upward to open the valve can be reduced, and the valve opening reliability of the flow control valve can be improved.

Fig. 5 is a schematic view showing the construction of the regulator of fig. 1. As shown in fig. 1 and 5, the valve body part 10 'further comprises a regulator 35', the regulator 35 'being fixedly connected to the sealing ring seat 12', the valve element 31 'being movable relative to the regulating flow channel of the regulator 35' for regulating the flow area between the first fluid port a 'and the second fluid port B'.

In order to better guide the nut 42 ', the sealing seat 21 ' comprises a guide hole 22 ' arranged above the guide portion 21, the outer wall of the nut 42 ' being in a clearance sliding fit with the inner wall of the guide hole 22 '. With such an arrangement, the seal seat 21 ' can not only play a role of connecting the valve body 11 and the motor housing, but also guide the valve core component 30 ' and the nut 42 '. The guide bore 22 'is formed in particular by the inner bore of a radial projection extending radially inwards from the inner wall of the sealing seat 21'.

And, in a further aspect, the outer edge of the seal ring seat 12 ' extends upwardly to form an outwardly extending wall 122 ' (shown in fig. 1 in a pre-staking state of the outwardly extending wall 122 '), and the bottom outer edge of the regulator 35 ' has an outwardly extending flange portion 352 ', which is welded to the outwardly extending wall 122 ' of the seal ring seat 12 '. The regulator 35 ' further includes an axially extending regulating segment 351 ', the regulating segment 351 ' including a regulating flow passage 353 ', which regulating flow passage 353 ' may be embodied as a V-shaped notch. When the spool 31 'abuts the seal ring 13', the regulator 35 'is located outside the spool 31'. The outer edge of the seal ring 13 'is pressed by the radial flange portion 352', the inner edge of the seal ring 13 'is pressed by the step surface of the inner extension wall 34', and the seal ring 13 'can be reliably attached to the seal ring seat 12', thereby improving the inner leakage performance of the valve.

Fig. 6 is a partial enlarged view of fig. 1 at I. The inner diameter of the enlarged diameter portion 312 ' is larger than the inner diameter of the body portion 311 ', the inner diameter of the enlarged diameter portion 312 ' is smaller than the outer diameter of the body portion 311 ', and when the seal portion 3121 ' of the valve body 31 ' abuts against the seal ring 13, the valve body member 30 ' includes an inner lining portion 34 ', the inner lining portion 34 ' is substantially annular, and the minimum gap between the inner wall of the regulator 35 ' and the outer wall of the enlarged diameter portion 312 ' is X₁', the minimum clearance between the outer wall of the inner extension wall 34 ' and the inner wall of the enlarged diameter portion 312 ' is X₂', then X₁’﹤1mm，X₂' < 1 mm. With such a design, when the fluid enters in the forward direction, the gap between the inner wall of the fluid self-regulator 35 ' and the outer wall of the expanded diameter portion 312 ' flows through the gap between the outer wall of the lining portion 34 ' and the inner wall of the expanded diameter portion 312 ', so that the fluid pressure received by the valve core component 30 ' tends to be balanced, the pressure difference received by the valve core component 30 ' is reduced, the operation reliability of the flow control valve is improved, and the fluid pressure received by the valve core component 30 ' can be further adjusted by adjusting the X₁' and X₂' size of the X can be adjusted, and as a specific scheme, X can be designed₁’﹤0.3mm，X₂’ ﹤0.3mm。

In a more specific aspect, as shown in fig. 2, the sealing ring seat 12 ' includes an annular groove portion 121 ', the sealing ring 13 ' is disposed in the annular groove portion 121 ', an inner wall of the annular groove portion 121 ' extends axially upward to form the aforementioned lining portion 34 ', an outer wall of the annular groove portion 121 ' extends axially upward to form the fixing portion 36 ', and a lower end of the adjuster 35 ' includes a radial flange portion 351 ' extending radially outward, and the radial flange portion 351 ' at least partially covers the sealing ring 13 ', and can function to limit the sealing ring 13 '. The radial flange 351 'is swaged and fixed to the fixing portion 36'. Fig. 6 shows the state in which the fixing portion 36' is not caulked. The outer wall of the inner part 34 'may be provided with a step 341' having a downward facing step, so that it abuts against the inner edge of the sealing ring 13 'to improve the deformation of the sealing ring 13'.

It should be noted that the liner portion 34' may be formed not by the seal ring seat directly but by an additional member, for example, a bush fixed to the seal ring seat by welding, riveting, or the like in a circular shape. This is also within the scope of the invention.

In the above embodiments, the specific shape of the seal portion is not limited as long as the object of the present invention can be achieved. The detailed shape of the sealing part can be that the lower end surface of the sealing part is a ring-shaped plane as shown in fig. 6, in this case, the inner edge of the ring-shaped plane is used as a sealing inner edge ring line, and the outer edge of the ring-shaped plane is used as a sealing outer edge ring line. Fig. 7 is a partial schematic view showing a first modification of the sealing ring engaged with the valve element, and as shown in fig. 7, the sealing portion 3121A 'includes a first protruding portion 1A' and a second protruding portion 1B 'which are arranged at intervals, a side of the first protruding portion 1A' close to the center line of the valve element 31 includes a sealing inner edge circular line 3121A ', and a side of the second protruding portion 1B' far from the center line of the valve element 31 'includes a sealing outer edge circular line 3121B'.

In the above embodiments, the shape of the seal ring 13' is not particularly limited, and various configurations may be employed, and fig. 8 is a partial schematic view showing a second modification of the seal ring engaged with the valve body. As shown, the sealing ring 13a ' may include a recess portion 131A ' in the sectional view shown in the drawing, and the sealing portion 3121 ' of the valve body 31 ' protrudes into the recess portion 131A ', at which the sealing inner edge loop line 3121A ' and the sealing outer edge loop line 3121B ' of the sealing portion 3121 ' abut against the recess portion 131A '. Fig. 9 is a partial schematic view showing a third modification of the seal ring engaged with the valve body. As shown, the sealing ring 13b 'may include a recess 131 b' in the sectional view shown in the drawing, and the sealing portion 3121 'of the valve body 31' protrudes into the recess 131b ', at which time the sealing inner edge loop line 3121' and the sealing outer edge loop line 3121 'of the sealing portion 3121' are abutted against the recess 131 b. The recessed portion 131a 'is different from the recessed portion 131 b' in that, in fig. 9, the inclination angle of the inner wall of the portion of the recessed portion 131b 'located outside the spool 31' is larger than the inclination angle of the inner wall of the portion of the recessed portion 131b 'located inside the spool 31'. Fig. 10 is a partial schematic view showing a fourth modification of the seal ring engaged with the valve body. As shown, the sealing ring 13c ' may include a recess portion 131c ' in the sectional view shown in the drawing, and the sealing portion 3121 ' of the valve body 31 ' protrudes into the recess portion 131c ', at which the sealing inner edge annular line 3121A ' and the sealing outer edge annular line 3121B ' of the sealing portion 3121 ' abut against the recess portion 131c '. The recess 131c 'is different from the recess 131 b' in that, in fig. 10, the inclination angle of the inner wall of the portion of the recess 131c 'located inside the spool 31' is larger than the inclination angle of the inner wall of the portion of the recess 131c 'located outside the spool 31'.

Fig. 11 is a schematic structural diagram of another flow control valve provided by the present invention. The flow control valve of the present embodiment is specifically an electromagnetic valve, and the main difference between the flow control valve of the foregoing embodiments is that. In the electromagnetic valve, the control component comprises a static iron core 100a 'and a movable iron core 100 b' which can drive the valve core component to move along the axial direction of the movable iron core.

The flow control valve provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are set forth only to facilitate an understanding of the methods and their core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.