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,阀芯包括本体部、设置于本体部下方的扩径部,本体部和扩径部大致呈圆环状,扩径部的外径大于本体部的外径,扩径部的下端包括密封部,阀芯与导向部之间包括位于密封部件下侧的第一预定间隙；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,定义第一预定间隙的通流面积为S-1,则S-外＞S-内,S-外＞S-1,能改善闭阀状态下流量控制阀的内泄漏。(The invention discloses a flow control valve, wherein a 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 sealing part, and a first preset gap positioned on the lower side of a sealing part is arranged between the valve core and a guide part; when the sealing part is abutted against the sealing ring, the sealing part comprises a sealing inner edge ring line and a sealing outer edge ring line, and a projection ring line of the outer edge of the body part in the vertical direction of the sealing ring is positioned between the sealing inner edge ring line and the sealing outer edge ring line; 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 part Defining an outer annular surface between the outer edge of the seal and the projected annular lineThe area of the outer annular surface is S Outer cover Defining a first predetermined gap having a flow area S 1 Then S is Outer cover ＞S Inner part ，S Outer cover ＞S 1 The internal leakage of the flow control valve in the 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 guide part, a sealing ring, a first fluid port and a second fluid port, the valve core component comprises a valve core and a sealing component, the valve core and the sealing component can slide axially relative to the guide part, 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 sealing part, and the valve core component can slide relative to the inner wall of the guide part to enable the sealing part to be abutted against or separated from the sealing ring;

the outer edge of the sealing component is abutted against the inner wall of the guide part; 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 body positioned on the upper side of the sealing component and a second cavity body positioned on the lower side of the sealing component, the second cavity body is communicated with the first fluid port, and the first cavity body is communicated with the second cavity body through the balance flow path; when the sealing part is abutted against the sealing ring, the first cavity is not communicated with the second fluid port;

a first predetermined gap is formed between the valve element and the guide portion and below the sealing member; 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; an inner annular surface is formed between the sealing inner edge annular line and the projection annular line, and the area of the inner annular surface is defined as S_{Inner part}An outer annular surface is formed between the sealing outer edge loop line and the projection loop line, and the area of the outer annular surface is defined as S_{Outer cover}Defining a flow area of said first predetermined gap as S₁Then S is_{Outer cover}＞S_{Inner part}，S_{Outer cover}＞S₁。

2. The flow control valve according to claim 1, characterized in that a second predetermined gap is included between the spool and the guide portion on an upper side of the seal member, and a flow area defining the second predetermined gap is S₂Then S is_{Inner part}+S₁+S₂≈S_{Outer cover}。

3. The flow control valve according to claim 2, wherein the second predetermined gap is formed between an outer edge of the body portion and an inner edge of the guide portion, a projected area of the second predetermined gap in a vertical direction of the seal ring is a flow area of the second predetermined gap, and S₂≈S₁。

4. 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, 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, and S is_{Outer cover}＝1.5S_{Inner part}-2.5S_{Inner part}。

5. The flow control valve according to any one of claims 1 to 4, 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.

6. The flow control valve according to any one of claims 1 to 4, wherein the valve body component comprises a valve body and a guide member fixedly connected with the valve body, the lower end of the guide member extends into the inner cavity of the valve body, the guide member comprises the guide portion and a guide hole arranged above the guide portion, the flow control valve comprises a transmission component, the transmission component comprises a screw rod and a nut, the nut can drive the valve core component to move axially, and the outer wall of the nut can be in clearance sliding fit with the inner wall of the guide hole.

7. The flow control valve according to claim 6, wherein the valve body component comprises a valve body and a sealing ring seat with an inner hole, the sealing ring seat is arranged in the inner cavity of the valve body, the valve body is welded or screwed with the sealing ring seat, the sealing ring is arranged on the sealing ring seat, and the sealing ring is fixedly connected with the sealing ring seat.

8. The flow control valve of claim 7, wherein the flow control valve is an electronic expansion valve, the valve body member further comprising a regulator fixedly attached to the sealing ring seat, the valve spool movable relative to a regulating flow passage of the regulator to regulate a flow area between the first fluid port and the second fluid port.

9. The flow control valve of claim 8, wherein an outer edge of the seal ring seat extends upwardly to form an extension wall, a bottom outer edge of the regulator has an outwardly extending flange portion, the regulator further including an axially extending regulation segment including the regulation flow passage, the extension wall abutting the flange portion, the flange portion abutting the seal ring, the regulator being located outside of the spool member when the spool abuts the seal ring.

10. The flow control valve of claim 7, wherein the valve body member further comprises a pressing sleeve, the pressing sleeve is substantially annular, the pressing sleeve is at least partially disposed in the inner bore of the sealing ring seat, the pressing sleeve is fixedly connected with the sealing ring seat, the pressing sleeve comprises a first lower step portion with a downward step surface, and the step surface of the first lower step portion abuts against the sealing ring.

11. The flow control valve of claim 9, wherein the bore wall of the inner bore of the seal ring seat includes a first step and a second step, the bottom of the press sleeve abuts the first step, the seal ring seats against the second step, and the extension wall extends upward from an outer edge of the second step.

12. The flow control valve according to any one of claims 1 to 4, wherein 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 pressing sleeve and a regulator, the pressing sleeve is approximately annular, the pressing sleeve is at least partially arranged in the inner hole of the sealing ring seat, the pressing sleeve is fixedly connected with the sealing ring seat, the regulator is 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 minimum clearance between the inner wall of the adjuster and the outer wall of the diameter expanding part is X₁The minimum clearance between the outer wall of the pressing sleeve and the inner wall of the expanding part isX₂Then X₁﹤1mm，X₂﹤1mm。

13. The flow control valve of claim 12, wherein X₁﹤0.3mm，X₂﹤0.3mm。

14. The flow control valve according to any one of claims 1 to 4, 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.

15. The flow control valve according to any one of claims 1 to 4, wherein the flow control valve is an electromagnetic valve, the valve body component comprises a valve body and a guide member fixedly connected with the valve body, the lower end of the guide member extends into the inner cavity of the valve body, the guide member comprises the guide portion and a guide hole arranged above the guide portion, the electromagnetic valve further 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 to control the flow of fluid, 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, it is a technical problem that those skilled in the art have tried to solve to improve the internal leakage of the flow control valve in a closed state.

Disclosure of Invention

The invention aims to provide a flow control valve, which can improve the internal leakage of the flow control valve in a closed valve 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 guide part, a sealing ring, a first fluid port and a second fluid port, the valve core component comprises a valve core and a sealing component, the valve core and the sealing component can axially slide relative to the guide part, 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 sealing part, and the valve core component can slide relative to the inner wall of the guide part to enable the sealing part to be abutted to or separated from the sealing ring;

the outer edge of the sealing component is abutted against the inner wall of the guide part; 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 the upper side of the sealing component and a second cavity arranged on the lower side of the sealing component, 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 first cavity is not communicated with the second fluid port;

a first predetermined gap is formed between the valve element and the guide portion and below the sealing member; 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; an inner annular surface is formed between the sealing inner edge loop line and the projection loop line, and the inner annular surfaceHas an area of S_{Inner part}An outer annular surface is formed between the sealing outer edge loop line and the projection loop line, and the area of the outer annular surface is S_{Outer cover}Defining a flow area of said first predetermined gap as S₁Then S is_{Outer cover}＞S_{Inner part}，S_{Outer cover}＞S₁。

The invention provides a flow control valve, wherein a valve core comprises a body part and an expanding part, the outer diameter of the expanding part is larger than that of the body part, the lower end of the expanding part comprises a sealing part, the sealing part comprises a sealing inner edge ring line and a sealing outer edge ring line, and a projection ring line of the outer edge of the body part in the vertical direction of a sealing ring is positioned between the sealing inner edge ring line and the sealing outer edge ring line; 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 part}Defining an outer annular surface formed between the outer edge of the seal and the projection loop, the outer annular surface having an area S_{Outer cover}Defining a first predetermined gap having a flow area S₁Then S is_{Outer cover}＞S_{Inner part}，S_{Outer cover}＞S₁The invention can improve the internal leakage of the flow control valve under the state of closing the valve.

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 structural view of a spool member of the flow control valve of FIG. 1;

FIG. 3 is a schematic diagram showing the fluid pressure distribution in the flow control valve when the flow control valve is closed;

FIG. 4 is a schematic diagram illustrating an analysis of fluid pressure experienced by the spool member when the flow control valve is closed with fluid entering in the forward direction;

FIG. 5 is a schematic diagram showing the fluid pressure distribution in the flow control valve when the flow control valve is closed;

FIG. 6 is a schematic view of the analysis of the fluid pressure experienced by the spool member when the flow control valve is closed;

FIG. 7 is a schematic diagram of the regulator of FIG. 1;

FIG. 8 is an enlarged view of a portion of FIG. 1 at I;

FIG. 9 is a schematic view showing a relationship between a projected loop line of the outer edge of the main body of the valve element on the sealing ring and a loop line of the inner sealing edge and a loop line of the outer sealing edge of the valve element when the sealing portion abuts against the sealing ring in FIG. 1;

fig. 10 is a partial schematic structural view of a second flow control valve provided in the present invention in a closed state;

fig. 11 is a schematic view showing a modification of the seal portion of the valve body;

FIG. 12 is a partial schematic view showing a first modification of the seal ring engaged with the valve body;

FIG. 13 is a partial schematic view showing a second modification of the seal ring engaged with the valve body;

fig. 14 is a partial schematic view showing a third modification of the seal ring engaged with the valve body;

fig. 15 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 guiding portion, i.e. the direction of O-O 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 diagram of a first flow control valve provided by the present invention in a closed state; FIG. 2 is a schematic structural view of a spool member of the flow control valve of FIG. 1; FIG. 3 is a schematic diagram showing the fluid pressure distribution in the flow control valve when the flow control valve is closed; FIG. 4 is a schematic diagram illustrating an analysis of fluid pressure experienced by the spool member when the flow control valve is closed with fluid entering in the forward direction; FIG. 5 is a schematic diagram showing the fluid pressure distribution in the flow control valve when the flow control valve is closed; FIG. 6 is a schematic view of the analysis of the fluid pressure experienced by the spool member when the flow control valve is closed; FIG. 7 is a schematic diagram of the regulator of FIG. 1; FIG. 8 is an enlarged view of a portion of FIG. 1 at I; fig. 9 is a schematic view showing a relationship between a projected loop line of the outer edge of the main body of the valve body of fig. 1 on the seal ring and a loop line of the inner seal edge and a loop line of the outer seal edge of the valve body when the seal portion abuts against the seal ring.

As shown in fig. 1 and fig. 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 with the transmission part 40, and the transmission part 40 is connected with the valve core part 30. The transmission component 40 can drive the valve core component 30 to move relative to the guide part of 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 component 10 comprises a valve body 11, a sealing ring seat 12 with an inner hole, a sealing ring 13 and a guide member 20, wherein the sealing ring seat 12 is formed by forging or finish turning after forging or formed by bar stock turning. The sealing ring seat 12 is disposed in the inner cavity of the valve body 11, an annular protrusion 121 is formed on the sealing ring seat 12, the annular protrusion 121 serves as a valve port, and a central through hole of the annular protrusion 121 serves as a valve port. The valve body 11 is welded or in threaded connection with the sealing ring seat 12, the sealing ring 13 is installed 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 is abutted against or separated from the sealing ring 13, so that the sealing ring seat 12 becomes a transition connection piece between the sealing ring 13 and the valve body 11, the valve port part can be formed on the sealing ring seat 12, and the requirement on the machining precision of the valve body component is reduced. The sealing ring seat 12 and the valve body 11 are arranged separately, and it should be understood that the sealing ring seat 12 is a component which is small in size and simple in structure relative to the valve body 11, can be processed separately, 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 required to be machined on the valve body like the existing flow control valves.

The valve body 11 includes a first fluid port a and a second fluid port B. 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 the effects are more obvious. The term "bidirectional" means that the fluid can enter in the forward direction or 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 guide member 20 is screwed and fixed to the valve body 11 with a sealing member interposed therebetween for sealing. The guide member 20 may be formed integrally with the valve body 11, provided that the object of the present invention is achieved. One end of the guide 20 extends into the inner cavity of the valve body 11, the guide 20 includes a guide portion 21, the valve core component 30 is disposed in the inner cavity of the valve body 11, the valve core component 30 includes a valve core 31 and a sealing component 32, the valve core 31 and the sealing component 32 can slide axially relative to the guide portion 21, in fig. 2, the sealing component 32 is mounted on the valve core 31, and the sealing component 32 can be matched with the inner wall of the guide portion 21. Specifically, the spool 31 includes an annular groove that opens toward the inner side wall of the guide portion 21, and the seal member 32 is disposed in the annular groove. The sealing member 32 includes a sealing ring 321 and an elastic gasket 322. The valve body 31 includes a body 311 and an enlarged diameter portion 312 provided below the body 311, the body 311 and the enlarged diameter portion 312 are substantially annular, and the outer edges of the body 311 and the enlarged diameter portion 312 are substantially equal in diameter except for the portion where the annular groove is provided, and the outer diameter of the enlarged diameter portion 312 is larger than the outer diameter of the body 311. The lower end of the enlarged diameter portion 312 includes a sealing portion 3121. The spool member 30 is slidable relative to the inner wall of the guide portion 21 to bring the seal portion 3121 into abutment with or separation from the seal ring 13. The inner wall of the guide portion 21 forms a seal with the sealing member 32 at the contact portion. When the sealing portion 3121 abuts against the sealing ring 13, the flow rate control valve includes a first cavity 1 provided on the upper side of the sealing member 32 and a second cavity 2 provided on the lower side of the sealing member 32 and communicating with the first fluid port a, the spool member 30 includes a balanced flow path, and when the sealing portion 3121 abuts against the sealing ring 13: the first cavity 1 is communicated with the second cavity 2 through a balance flow path, and the first cavity 1 is not communicated with the second fluid port B;

as shown in fig. 9, when the sealing portion 3121 abuts against the sealing ring 13, the sealing portion 3121 includes a sealing inner edge loop N and a sealing outer edge loop P which are matched with the sealing ring 13, a projection loop 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 N and the sealing outer edge loop P, an inner annular surface 3121A is formed between the sealing inner edge loop N and the projection loop M, and the area is S_{Inner part}An outer annular surface 3121B is formed between the outer edge sealing ring line P and the projection ring line M, and has an area S_{Outer cover}。

In this arrangement, as shown in fig. 1 to 4 and 9, when the fluid flows in the forward direction (i.e., 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 control valve is in the closed state, since the first chamber 1 is a zero-pressure region, and the second chamber 2 communicates with the first chamber 1 through the equilibrium flow path, the second chamber 2 also has a corresponding zero-pressure region therein. While the part of the enlarged diameter part 312 located outside the sealing loop M is subjected to the pressure P of the high-pressure fluid_{High outer}Is the area S of the outer annular surface 3121B_{Outer cover}Generating a force F acting on the sealing ring 13 in a direction toward the sealing ring 13_{High external ↓}. Further, since the valve body member 30 slides axially relative to the guide portion 21, a first predetermined gap X located on the lower side of the seal member 32 and a second predetermined gap Y located on the upper side of the seal member 32 are provided between the valve body member 30 and the guide portion 21, except for a sealing portion formed between the seal member 32 and the inner wall of the guide 20. The second predetermined gap Y is located at zero pressure region and is not acted by fluid pressure, and the existence of the first predetermined gap X, the valve core component 30 is also acted by acting force DeltaF of high-pressure fluid flowing into the second fluid port B and acting on the sealing component 32 in the direction departing from the valve port direction (upward direction)_↑The first predetermined gap X on the lower side of the sealing member 32 is defined as a flow area S₁Then Δ F_↑＝P_{High outer}·S₁The resultant of the fluid pressures received by the spool member 30Is F_{Outer cover}＝F_{High external ↓}+△F_↑Due to F_{High external ↓}And Δ F_↑Both directions are opposite, therefore, F_{Outer cover}＝P_{High outer}·(S_{Outer cover}－S₁) To facilitate improvement in the sealing reliability between the spool 31 and the seal ring 13 to facilitate improvement in the internal leakage of the flow control valve, F_{Outer cover}Is directed towards the sealing ring 13 and acts on the sealing ring 13, the area S of the outer annular surface_{Outer cover}A flow area S greater than the first predetermined clearance X₁I.e. S_{Outer cover}＞S₁。

Fig. 5 is a schematic diagram showing the pressure distribution in fig. 1 when the fluid is reversed (the fluid enters from the first fluid port a), and fig. 6 is a schematic diagram showing the force analysis of the spool member when the fluid is reversed. In this arrangement, as shown in fig. 1, 5, 6 and 9, when the fluid flows in the reverse direction (i.e., from the first fluid port a), the sealing portion 3121 of the diameter-enlarged portion 312 abuts against the sealing ring 13, and the flow control valve is in the closed state, since the second chamber 2 is a high pressure region, and the first chamber 1 and the second chamber 2 are communicated through the equilibrium flow path, the first chamber 1 is also correspondingly a high pressure region. While 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 part}Generating a force F acting on the sealing ring 13 in a direction toward the sealing ring 13_{High inner ↓}. Due to the second predetermined gap Y, the valve body 30 is also subjected to a force Δ F in a direction in which the high-pressure fluid flowing into the second fluid port B acts on the sealing member 32 toward the valve port_↓The flow area of the gap on the upper side of the seal member 32 is defined as S₂Then Δ F_↓＝P_{High inner}·S₂The resultant force of the fluid pressures received by the spool member 30 is F_{Inner part}＝F_{High inner ↓}+△F_↓＝P_{High inner}·S_{Inner part}+P_{High inner}·S₂Due to F_{High inner ↓}And Δ F_↓Both in the same direction, both towards the sealing ring 32, and therefore F_{Inner part}＝P_{High inner}·(S_{Inner part}+S₂)，F_{Outer cover}Towards the sealThe ring 32 acts on the sealing ring 32, which is beneficial to improving the sealing reliability between the valve core 31 and the sealing ring 32 so as to improve the internal leakage of the flow control valve.

It can be seen that, in the flow control valve of the present scheme, when the fluid enters in the forward direction or in 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 in the reverse direction, and the internal leakage when the fluid enters in the forward direction or in the reverse direction can be improved.

Further, as shown in fig. 6, the second predetermined gap Y is formed between the outer edge of the main body portion 311 and the inner edge of the guide portion 21, and a projected area of the second predetermined gap Y in the vertical direction of the seal ring 13 is a flow area S of the second predetermined gap Y₂And S is₂And S₁Are approximately equal.

Moreover, in order to ensure that the valve opening force required by the valve core component 30 is not different when the fluid enters in the forward direction or the reverse direction under the same fluid pressure, that is, the difference between the fluid pressure differences suffered by the valve core component 30 is not large, the forward and reverse movements of the valve core component 30 are relatively stable, that is, F_{Outer cover}＝F_{Inner part}The flow control valve of the scheme is designed by S_{Outer cover}Greater than S_{Inner part}Area of (2), as mentioned above, F_{Outer cover}＝P_{High outer}·(S_{Outer cover}－S₁)，F_{Inner part}＝F_{High inner ↓}+△F_↑＝P_{High inner}·S_{Inner part}+P_{High inner}·S₂Due to P_{High outer}＝P_{High inner}If P is then F_{Outer cover}＝P·(S_{Outer cover}－S₁),F_{Inner part}＝P·(S_{Inner part}+S₂). Then, P (S)_{Outer cover}－S₁)＝P·(S_{Inner part}+S₂) Then S is_{Outer cover}＝S_{Inner part}+S₂+S₁. I.e. S_{Outer cover}Is greater than S_{Inner part}。

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 element 31, without changing the structural dimensions of other components of the valve, and thus, the flow control valve is advantageous for standardization and serialization of parts during production.

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 diameter-enlarged portion 312, the outer wall of the transition portion 313 is substantially in a slope shape, 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 order to keep the valve opening forces required for the forward and reverse applications of the valve relatively small, the area S of the outer annular surface_{Outer cover}Is an inner annular surface S_{Inner part}Is 1.5-2.5 times to effectively offset the pressure difference generated by the first predetermined gap X between the inner wall of the guide portion 21 and the spool member 30. For example, as a specific solution, the area S of the outer annular surface_{Outer cover}Is an inner annular surface S_{Inner part}2 times the area of (a). Namely S_{Outer cover}Equal to or approximately equal to 2S_{Inner part}. The advantage of such an arrangement is that the resistance of the fluid pressure received by the valve body member when the valve is opened can be taken into consideration when improving the internal leakage in the valve-closed state in both the forward direction and the reverse direction.

In a further embodiment, the enlarged diameter portion 312 includes a first section 3122 and a second section 3123 disposed below the first section 3122, an inner wall of the first section 3122 is disposed in a substantially equal diameter manner, an outer wall of the first section 3122 is disposed in a substantially equal diameter manner, an inner wall of the second section 3123 is disposed in a slope manner, and an inner diameter of an upper end of the inner wall of the second section 3123 is smaller than an inner diameter of a lower end of the inner wall of the second section 3123. With this arrangement, when the valve needs to be opened, the fluid acts on the second segment 3123, which is advantageous for opening the valve body 31.

As shown in fig. 1, the outer wall of the guide 20 is provided with an external thread, the inner wall of the valve body 11 is provided with an internal thread, the guide 20 is fixed to the valve body 11 by a thread connection, and a sealing ring is arranged between the two for sealing. For better guiding of the nut 42, the guide element 20 comprises a guide hole 22 arranged above the guide portion 21, in this embodiment the guide hole 22 is formed in particular by the inner bore of a radial projection projecting radially inwards from the inner wall of the guide element 20. The outer wall of the nut 42 is a clearance sliding fit with the inner wall of the guide bore 22. With this arrangement, the guide 21 can guide the valve body 11 and the motor housing as well as the valve body member 30 and the nut 42.

As shown in fig. 2, the valve core member 30 includes a nut cover 36 engaged with the nut 42, and a connection member 33 fixedly connected to 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 flow blocking portion 3321 in the middle and a communication passage 3322 provided outside the flow blocking portion 3321, the nut cover 36 includes an accommodation chamber 361, and when the valve core 31 abuts against the seal ring 13, the balance flow passage of the flow control valve includes the second chamber 2, the communication passage 3322, and the accommodation chamber 361. By providing the flow blocking portion 3321, when the valve element 31 is separated from the sealing ring 13, the fluid entering from the second fluid port B is gathered 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 the position of the flow blocking portion 3321, the pressure is 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 upwards to open the valve can be reduced, and the valve opening reliability of the flow control valve can be improved.

As shown in fig. 3 and 8, in a further design, the valve body component 10 further includes a pressing sleeve 34, the pressing sleeve 34 is substantially annular, the pressing sleeve 34 is at least partially disposed in the inner hole of the seal ring seat 12, the pressing sleeve 34 is fixedly connected to the seal ring seat 12, the pressing sleeve 34 includes a first lower step portion 341 with a downward step surface, and the step surface of the first lower step portion 341 abuts against the seal ring 13. Thus, the inner edge of the seal ring 13 is pressed by the pressing sleeve, increasing the fixing reliability of the seal ring 13.

Fig. 7 is a schematic view showing the construction of the regulator of fig. 1. As shown in fig. 1 and 7, the valve body member 10 further includes a regulator 35, the regulator 35 is fixedly connected to the seal ring seat 12, and the valve spool 31 is movable relative to a regulation flow passage 353 of the regulator 35 to regulate a flow area between the first fluid port a and the second fluid port B. The valve has a flow regulating function. And, in a further aspect, the outer edge of the sealing ring seat 12 extends upward to form an extension 121 (shown in fig. 1 as a state before the extension wall 121 is caulked), and the bottom outer edge of the adjuster 35 has an outwardly extending flange portion 352. Specifically, the adjuster 35 further includes an axially extending adjustment segment 351, the adjustment segment 351 including an adjustment flow passage 353, the adjustment flow passage 353 being specifically a V-shaped notch. The extension wall 121 abuts against the flange portion 352, the flange portion 352 abuts against the seal ring 13, and when the valve body 31 abuts against the seal ring 13, the regulator 35 is positioned outside the valve body 31. By such a design, the extension portion 121 and the flange portion 352 can be easily fixed by caulking, the outer edge of the seal ring 13 is pressed by the flange portion 352, the inner edge of the seal ring 13 is pressed by the step surface of the pressing sleeve 34, the seal ring 13 can be reliably attached to the seal ring seat 12, and the inner leakage performance of the valve is improved.

Fig. 8 is a partial enlarged view of fig. 1 at I. The minimum clearance between the inner wall of the adjuster 35 and the outer wall of the enlarged diameter portion 312 is X₁The minimum gap between the outer wall of the pressing sleeve 34 and the inner wall of the enlarged diameter portion 312 is X₂Then X₁﹤1mm，X₂Is less than 1 mm. With such a design, when the fluid enters in the forward direction, when the gap between the inner wall of the fluid self-regulator 35 and the outer wall of the diameter-expanding portion 312 flows through the gap between the outer wall of the pressing sleeve 34 and the inner wall of the diameter-expanding portion 312, 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 X₁And X₂Is adjusted. Specifically, the following design can be made: x₁﹤0.3mm，X₂﹤0.3mm。

In a further scheme, as shown in fig. 3, the hole wall of the inner hole of the seal ring seat 12 includes a first step portion 125 and a second step portion 126, the bottom of the pressing sleeve 34 abuts against the first step portion 125, the seal ring 13 is placed on the second step portion 126, and the extension wall 121 extends upward from the outer edge of the second step portion 126. This reliably supports the pressure sleeve 34 and the sealing ring 13.

Fig. 10 is a partial schematic structural view of a second flow control valve according to the present invention in a closed state.

The flow control valve of the present embodiment has the same advantageous effects and other components as those of the first embodiment, except that the sealing ring seat structure is different from that of the first embodiment. Only the differences will be described below.

As shown in fig. 10, the seal ring seat 12 includes a lining portion 120 ', the lining portion 120' is substantially annular, a third step portion 122 'is included between an outer wall of the lining portion 120' and an outer edge of the seal ring seat 12 ', and the seal ring 13 is disposed on the third step portion 122'. With such an arrangement, compared with the structure of the first embodiment, in the present embodiment, the number of parts is reduced, and the number of steps for welding the pressing sleeve and the sealing ring seat is reduced, in which the part of the "pressing sleeve" is reduced, and the lining portion 120 'is directly machined on the sealing ring seat 12'.

In a further aspect, the upper end of the lining portion 120 'is higher than the upper surface of the sealing ring 13, the outer wall of the lining portion 120' includes a second lower step portion 1211 'with a downward step surface, the step surface of the second lower step portion 1211' abuts against the sealing ring 13, the sealing ring seat 12 'includes a fourth step portion 123' disposed between the outer wall of the lining portion 120 'and the outer edge of the sealing ring 13, the inner diameter of the fourth step portion 123' is larger than the inner diameter of the third step portion 122 ', and the flange portion 352 of the adjuster 35 abuts against the step surface of the fourth step portion 123' and the sealing ring 13. With this arrangement, compared to the first embodiment in which the flange portion 352 is directly pressed only on the upper surface of the seal ring 13 and is not pressed on the seal ring seat 12', deformation of the seal ring 13 can be improved, and the sealing performance at the time of closing the valve can be further improved.

In the first embodiment, the seal ring seat may be modified such that the lower end of the flange portion 352 abuts against the seal ring 13 and the seal ring seat 12, as in the second embodiment. 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 portion 3121 may be that its lower end surface is a ring-shaped plane as shown in fig. 6, in which case, the inner edge of the ring-shaped plane serves as the sealing inner edge ring line and the outer edge of the ring-shaped plane serves as the sealing outer edge ring line. Fig. 11 is a schematic view showing a modification of the sealing portion of the valve body, and as shown in fig. 11, the sealing portion 3121A includes a first protruding portion 1A and a second protruding portion 1B which are provided at intervals, a side of the first protruding portion 1A close to the center line of the valve body 31 includes a sealing inner edge loop line 3121A, and a side of the second protruding portion 1B far from the center line of the valve body 31 includes a sealing outer edge loop 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. 12 is a partial schematic view showing a first modified example of the seal ring engaged with the valve body. As shown in fig. 12, the sealing ring 13a may include a recess 131A as shown in the drawing, and the sealing portion 3121 of the valve body 31 extends into the recess 131A to abut against the sealing ring 13, at which time, the sealing inner edge loop line 3121A and the sealing outer edge loop line 3121B of the sealing portion 3121 are shown. Fig. 13 is a partial schematic view showing a second modification of the seal ring engaged with the valve body. As shown, the sealing ring 13b may include a depressed portion 131b having a cross section as shown in the drawing, and the sealing portion 3121 of the valve body 31 is extended into the depressed portion 131b, at which time the sealing inner rim circuit 3121 and the sealing outer rim circuit 3121 of the sealing portion 3121 are abutted against the depressed portion 131 b. The recessed portion 131a is different from the recessed portion 131b in that, in fig. 13, 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. 14 is a partial schematic view showing a third modification of the seal ring engaged with the valve body. As shown, the sealing ring 13c may include a recess 131c as shown in the drawing, and the sealing portion 3121 of the valve body 31 extends into the recess 131c to abut against the sealing ring 13c, at which time the sealing inner edge loop line 3121A and the sealing outer edge loop line 3121B of the sealing portion 3121 are shown in the drawing. The recessed portion 131c is different from the recessed portion 131b in that, in fig. 13, the inclination angle of the inner wall of the portion of the recessed portion 131c located inside the spool 31 is larger than the inclination angle of the inner wall of the portion of the recessed portion 131c located outside the spool 31.

Fig. 15 is a schematic structural diagram of another flow control valve provided by the present invention. The flow control valve of this embodiment is specifically an electromagnetic valve, and the main difference between the flow control valve of the foregoing embodiments is the difference in the control components. In this solenoid valve, the control unit includes a stationary core 100a and a movable core 100 b. Other structures of the valve body, the valve seat member, and the like can be understood with reference to the foregoing embodiments.

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 presented only to assist in understanding the method and its 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.