A flow control valve

Abstract

The present invention discloses a flow control valve, comprising a valve body component and a valve core component, wherein the valve body component comprises a sealing seat component, a sealing ring, a first fluid port and a second fluid port, the sealing seat component comprises a sealing seat and a sealing component limitedly connected to the sealing seat, the inner edge of the sealing component abuts against the valve core component, when the sealing portion abuts against the sealing ring, the sealing portion comprises a sealing inner edge ring line and a sealing outer edge ring line, the projection ring line of the outer edge of the body portion in the vertical direction of the sealing ring is located between the sealing inner edge ring line and the sealing outer edge ring line; an inner annular surface is defined between the sealing inner edge ring line and the projection ring line, and the area of ​​the inner annular surface is S 内’ , define the outer annular surface formed between the sealing outer edge ring line and the projection ring line, and the area of ​​the outer annular surface is S 外’ , then S 外’ =S 内’ , whether the fluid enters in the forward or reverse direction, it can improve the internal leakage of the flow control valve in the closed valve state.

Description

Technical Field

[0001] The invention relates to the technical field of fluid control, and in particular to a flow control valve. Background Art

[0002] In the field of fluid control technology, flow control valves are widely used. Flow control valves generally include a fluid inlet, a fluid outlet, a valve port, and a valve core. Driven by a transmission component, the valve core can move to abut against or separate from the valve port to control the fluid connection (open valve), disconnection (close valve) between the fluid inlet and the fluid outlet, or adjust the flow rate between the fluid inlet and the fluid outlet. As far as the flow control valve is concerned, improving the internal leakage of the flow control valve in the closed valve state is one of the technical problems that technicians in this field have been trying to solve. Summary of the invention

[0003] The object of the present invention is to provide a flow control valve which can improve the internal leakage of the flow control valve in a closed valve state.

[0004] The flow control valve provided by the present invention comprises a valve body component and a valve core component, wherein the valve body component comprises a sealing seat component, a sealing ring, a first fluid port and a second fluid port, the sealing seat component comprises a sealing seat and a sealing component limitedly connected to the sealing seat, the inner edge of the sealing component abuts against the valve core component, the valve core component comprises a valve core, the valve core comprises a body part and an expanded diameter part arranged below the body part, the body part and the expanded diameter part are substantially annular, the outer diameter of the expanded diameter part is larger than the outer diameter of the body part, the lower end of the expanded diameter part comprises a sealing part, and the valve core component can slide relative to the sealing seat component to make the sealing part abut against or separate from the sealing ring;

[0005] The valve core component includes a balancing flow path. When the sealing portion abuts against the sealing ring, the flow control valve includes a first cavity located 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 and the second cavity are communicated with each other through the balancing flow path. When the sealing portion abuts against the sealing ring, the sealing portion includes a sealing inner edge ring line and a sealing outer edge ring line. The projection ring line of the outer edge of the main body in the vertical direction of the sealing ring is located between the sealing inner edge ring line and the sealing outer edge ring line. An inner annular surface is defined between the sealing inner edge ring line and the projection ring line, and the area of ​​the inner annular surface is S. 内’ , define an outer annular surface formed between the sealing outer edge annular line and the projection annular line, and the area of ​​the outer annular surface is S 外’ , then S 外’ =S 内’ The flow control valve of the present invention can improve the internal leakage of the flow control valve in the closed valve state. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 The figure shows a schematic structural diagram of the first flow control valve provided by the present invention in a closed valve state;

[0007] Figure 2 The figure shows the fluid pressure analysis diagram of the valve core component when the fluid enters forward and the flow control valve is in the closed state;

[0008] Figure 3 The figure shows the fluid pressure analysis diagram of the valve core component when the fluid enters in the reverse direction and the flow control valve is in the closed state;

[0009] Figure 4 Shown Figure 1 Schematic diagram of the relationship between the projection line of the outer edge of the main body of the valve core on the sealing ring and the sealing inner edge line and the sealing outer edge line of the valve core when the middle sealing part abuts against the sealing ring;

[0010] Figure 5 Shown Figure 1 Schematic diagram of the structure of the middle regulator;

[0011] Figure 6 Shown Figure 1 A partial enlarged view of point I in the middle;

[0012] Figure 7 Shown is a partial schematic diagram of the first modified example of the sealing ring cooperating with the valve core;

[0013] Figure 8 Shown is a partial schematic diagram of the second modified example of the sealing ring cooperating with the valve core;

[0014] Fig. 9 FIG. 1 is a partial schematic diagram of the third modified example of the sealing ring cooperating with the valve core;

[0015] Fig.10 FIG. 1 is a partial schematic diagram showing the fourth modified example of the sealing ring cooperating with the valve core;

[0016] Fig.11 Shown is a structural schematic diagram of another flow control valve provided by the present invention. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] It should be noted that the directional words used herein are only for the purpose of expressing the technical solution clearly and conveniently. It should be understood that the directional words used herein should not limit the scope of protection requested by the present application.

[0019] The "axial direction" mentioned in this article refers to the direction along the axis of the seal seat, that is, Figure 1 In the OO direction shown in the figure, the "fixed connection" mentioned in this document can be that the two parts are directly fixedly connected, or the two parts can be fixedly connected through other parts, that is, the two parts are indirectly fixedly connected.

[0020] Figure 1 FIG. 1 is a schematic diagram showing the structure of the first flow control valve provided by the present invention in a closed valve state. Figure 2 The figure shows the fluid pressure analysis diagram of the valve core components when the fluid enters forward and the flow control valve is in the closed state. Figure 3 The figure shows the fluid pressure analysis diagram of the valve core components when the fluid enters in the reverse direction and the flow control valve is in the closed state. Figure 4 Shown Figure 1 Schematic diagram of the relationship between the projection line of the outer edge of the main body of the valve core on the sealing ring and the sealing inner edge line and the sealing outer edge line of the valve core when the middle sealing part abuts against the sealing ring. Figure 5 Shown Figure 1 The schematic diagram of the regulator. Figure 6 Shown Figure 1 A partial enlarged view of point I in the middle.

[0021] like Figure 1 , Figure 2 As shown, the flow control valve of the present solution is specifically an electronic expansion valve, including a valve body component 10', a valve core component 30', a transmission component 40' and a motor component 50'. The motor component 50' is connected to the transmission component 40', and the transmission component 40' is connected to the valve core component 30'. The transmission component 40' can drive the valve core component 30' to move axially relative to the valve body component 10' under the drive 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.

[0022] The valve body component 10' includes a valve body 11', a sealing ring seat 12' with an inner hole, a sealing ring 13', and a sealing seat component 20'. The sealing ring seat 12' is formed by forging or fine turning after forging, or by bar turning. The sealing ring seat 12' is arranged in the inner cavity of the valve body 11', and the sealing ring 13' is installed on the sealing ring seat 12'. The sealing ring 13' is fixedly connected to the sealing ring seat 12'. The valve core component 30' can abut or separate from the sealing ring 13'. In this way, the sealing ring seat 12' becomes a transitional connector between the sealing ring 13' and the valve body 11', and the valve mouth can be formed on the sealing ring seat 12', which reduces the requirements for the processing accuracy of the valve body components. When the sealing ring seat 12' is separately arranged from the valve body 11', it should be known that the sealing ring seat 12' is a component with a smaller volume and a simpler structure relative to the valve body 11', and can be processed separately, is easy to process, has high precision, and is convenient for mass production. Under the premise of simple process, it is more conducive to precision control. Unlike some existing flow control valves, the valve port with high precision requirement is no longer processed on the valve body. Of course, it can be understood that in this embodiment, the valve port can also be formed on the valve body 11.

[0023] The technical solution of this article can be applied to a one-way flow control valve or a two-way flow control valve, and its advantages or effects are more obvious in a two-way flow control valve. "Two-way" means that the fluid can enter in the forward direction or in the reverse direction. The forward direction means that when the valve is used, the fluid can flow in from the second fluid port B' and flow out from the first fluid port A' in the open state. The reverse direction means that when the valve is used, the fluid can flow in from the first fluid port A' and flow out from the second fluid port B' in the open state.

[0024] The valve body 11' comprises a first fluid port A' and a second fluid port B'. The sealing seat component 20' comprises a sealing seat 21' and a sealing component 32' which is positionally connected to the sealing seat 21'. Figure 1 As shown, the lower part of the sealing seat 21' is roughly cylindrical and extends deep into the valve body 11'. The outer wall of the sealing seat 21' can be provided with an external thread, and the inner wall of the valve body 11' is provided with an internal thread. The sealing seat 21' is threadedly connected and fixed to the valve body, and a sealing ring is provided between the two for sealing. Alternatively, the sealing seat 21' can be welded and fixed to the valve body 11', or, after the lower end of the sealing seat 21' extends into the valve body 11', the sealing seat 21' is fixed by other parts.

[0025] The sealing seat component 20' further includes a fixing block 25', which is welded or riveted to the lower part of the sealing seat 21' and fixed to the limiting step 211' to form an annular receiving groove with an opening toward the valve core component 30'. The sealing component 32' is axially limited in the annular receiving groove and is limitedly connected to the sealing seat 21'. Under the premise of achieving the purpose of the present invention, the sealing seat 21' can also be formed integrally with the valve body 11. The sealing component 32' includes a sealing ring 321' and an elastic gasket 322'.

[0026] The valve core component 30' is arranged in the inner cavity of the valve body 11', and the valve core component 30' includes a valve core 31', and the valve core 31' includes a main body 311' and an expanded diameter portion 312' arranged below the main body 311'. The diameters of the outer edge of the main body 311' are roughly equal, and the main body 311' and the expanded diameter portion 312' are roughly annular, and the outer diameter of the expanded diameter portion 312' is greater than the outer diameter of the main body 311'. The lower end of the expanded diameter portion 312' includes a sealing portion 3121'. The valve core component 30' can slide axially relative to the sealing component 32' so that the sealing portion 3121' abuts against or separates from the sealing ring 13'.

[0027] The outer edge of the sealing ring 321' abuts against the inner wall of the sealing seat 21', and the inner wall of the elastic gasket 322' abuts against the outer wall of the main body 311' of the valve core 31'. When the sealing part 3121' abuts against the sealing ring 13', the inner edge of the elastic gasket 322' and the outer edge of the valve core component 30' fit together at the contact position to form a seal.

[0028] The valve core component 30' and the sealing seat 21' include a first predetermined gap X' located at the lower side of the sealing component 32' and a second predetermined gap Y' located at the upper side of the sealing component 32'. The flow control valve includes a first cavity 1' disposed at the upper side of the sealing component 32' and a second cavity 2' disposed on the valve core 31' and communicating with the first fluid port A'. The valve core component 30' includes a balancing flow path, the first cavity 1' is communicated with the second cavity 2' through the balancing flow path, and the first cavity 1' is not communicated with the second fluid port B'.

[0029] When the sealing portion 3121' abuts against the sealing ring 13', the sealing portion 3121' includes a sealing inner edge ring line N' and a sealing outer edge ring line Q' that cooperate with the sealing ring 13'. The projection ring line M' of the outer edge of the main body 311' in the vertical direction of the sealing ring 13' is located between the sealing inner edge ring line N' and the sealing outer edge ring line Q'. An inner annular surface 3121A' is formed between the sealing inner edge ring line N' and the projection ring line M', and the area is S 内’ The outer annular surface 3121B' is formed between the sealing outer edge ring line Q' and the projection ring line M', and the area is S 外’ . If the setting is Figure 2As shown, when the fluid flows in in the forward direction (i.e., flows in from the second fluid port B'), the sealing portion 3121' of the enlarged diameter portion 312' abuts against the sealing ring 13', and the flow control valve is in a closed valve state, since the first cavity 1' is a zero pressure zone, and the second cavity 2' is connected to the first cavity 1' through a balanced flow path, the first cavity 1' is also a corresponding zero pressure zone. However, the fluid pressure acting on the sealing component 32' at the first predetermined gap X' on the lower side of the sealing component 32' and the second predetermined gap Y' on the upper side of the sealing component 32' will not be transmitted to the valve core component 30' through the sealing component 32'. Only the portion of the enlarged diameter portion 312' of the valve core component 30' located outside the sealing ring line M' will be subjected to the pressure P of the high-pressure fluid. 高外 The force area is the area S of the outer annular surface 3121B'. 外’ , generating a force F acting on the sealing ring 13' in the direction of the sealing ring 13' 高外↓ The fluid pressure on the valve core component 30' is F 外 =F 高外↓ =P 高外 · S 外’ , which is beneficial to improving the sealing reliability between the valve core 31 ' and the sealing ring 13 ', so as to improve the internal leakage of the flow control valve.

[0030] Similarly, Figure 3 The figure shows the force analysis diagram of the valve core components when the fluid enters in the reverse direction. Figure 1 , Figure 3 As shown, when the fluid flows in reverse (i.e., flows in 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 a closed valve state, since the second cavity 2' is a high pressure area, and the first cavity 1' and the second cavity 2' are connected through the balance flow path, the second cavity 1' is also a high pressure area accordingly. The part of the enlarged diameter portion 312' located inside the sealing ring line M' will be subjected to the pressure P of the high pressure fluid. 高内 The force area is the area S of the inner annular surface 3121A'. 内’ , generating a force F acting on the sealing ring 13' in the direction of the sealing ring 13' 高内↓ The fluid pressure on the valve core component 3'0 is F 内 =F 高内↓ =P 高内 ·S 内’ , 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.

[0031] It can be seen that no matter when the fluid enters in the forward direction or the reverse direction, the valve core component 30' can be subjected to the force exerted by the fluid toward the sealing ring 13', which is conducive to the tightness between the valve core 31' and the sealing ring 13'. This can facilitate the cooperation between the valve core 31' and the sealing ring 13' in the closed valve state, and improve the internal leakage when the fluid enters in the forward direction or the reverse direction.

[0032] In order to ensure that the valve opening force required by the valve core component 30' is not much different when the fluid enters forward or reverse under the same fluid pressure, that is, the fluid pressure difference received by the valve core component 30' is not much different, so that the forward and reverse movements of the valve core component 30' are relatively stable, the flow control valve of this scheme is designed S 外’ Equal to S 内’ When F 外 =P 高外 · S 外’ , F 内 =P 高内 ·S 内’ , then F 外 =F 内 Of course, it is understandable that the equality here may not be absolutely equal in actual products, but only close to equality.

[0033] In addition, due to the design of the expansion portion 312' and the sealing portion 3121', the flow control valve of the present embodiment can also adjust the size of the fluid pressure difference received by the valve core component 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, which is conducive to the standardization and serialization of parts when the flow control valve is produced.

[0034] Furthermore, in order to reduce the resistance during fluid flow and facilitate valve closing, the valve core 31 also includes a transition portion 313', one end of the transition portion 313' is connected to the main body portion 311', and the other end of the transition portion 313' is connected to the expanded diameter portion 312'. The outer wall of the transition portion 313' is roughly inclined, 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'.

[0035] In a further solution, the enlarged diameter portion 312' includes a first section 3122' and a second section 3123' arranged below the first section, the inner wall of the first section 3122' is arranged in a substantially equal diameter, the outer wall of the first section 3122' is arranged in a substantially equal diameter, the inner wall of the second section 3123' is arranged in a bevel 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 such an arrangement, when the valve needs to be opened, the shape of the second section 3123' can facilitate the fluid to act on the valve core 31' to open the valve.

[0036] like Figure 1 and Figure 2 As shown, the valve core component 30' includes a nut cover 37' matched with the nut 42', a connecting piece 33' fixedly connected to the nut cover 37' and the valve core 31', the connecting piece 33' includes a cylindrical portion 331' and a plate portion 332', the plate portion 332' includes a middle baffle portion 3321' and a connecting channel 3322' arranged on the outside of the baffle portion 3321', the nut cover 37' includes an accommodating chamber 371', and when the valve core 31' abuts against the sealing ring 13', the balancing flow channel of the flow control valve includes a second cavity 2', a connecting channel 3322', and an accommodating chamber 371'. By setting the baffle 3321', when the valve core 31 is separated from the sealing ring 1'3, the fluid entering from the second fluid port B' will gather below the baffle 3321' to form a high-pressure area. The baffle 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 component 32', so that the high-pressure fluid is dispersed around the baffle 3321', and the pressure is reduced. The fluid with reduced pressure then enters the first cavity 1' on the upper side of the sealing component 32' through the accommodating cavity 371'. In this way, the downward fluid pressure on the valve core component 30' can be reduced, and the resistance of the valve core component 30' when moving upward to open the valve can be reduced, which is beneficial to improving the opening reliability of the flow control valve.

[0037] Figure 5 Shown Figure 1 Schematic diagram of the structure of the regulator. Figure 1 and Figure 5 As shown, the valve body component 10' further comprises a regulator 35', which is fixedly connected to the sealing ring seat 12', and the valve core 31' can move relative to the regulating flow channel of the regulator 35' to adjust the flow area between the first fluid port A' and the second fluid port B'.

[0038] In order to better guide the nut 42', the sealing seat 21' includes a guide hole 22' arranged above the guide portion 21, and the outer wall of the nut 42' and the inner wall of the guide hole 22' are slidably matched. In this way, the sealing seat 21' can not only connect the valve body 11 and the motor housing, but also guide the valve core component 30' and the nut 42'. The guide hole 22' is specifically formed by the inner hole of the radial protrusion extending radially inwardly from the inner wall of the sealing seat 21'.

[0039] In a further embodiment, the outer edge of the sealing ring seat 12' extends upward to form an outer extension wall 122' ( Figure 1The figure shows the state before the outer extension wall 122' is riveted), the bottom outer edge of the regulator 35' has a flange portion 352' extending outward, and the flange portion 352' is welded to the outer extension wall 122' of the sealing ring seat 12'. The regulator 35' also includes an axially extending adjustment section 351', and the adjustment section 351' includes an adjustment channel 353', and the adjustment channel 353' can be specifically a V-shaped notch. When the valve core 31' abuts the sealing ring 13', the regulator 35' is located outside the valve core 31'. The outer edge of the sealing ring 13' is pressed by the radial flange portion 352', and the inner edge of the sealing ring 13' is pressed by the step surface of the inner extension wall 34'. The sealing ring 13' can fit the sealing ring seat 12' more reliably, thereby improving the internal leakage performance of the valve.

[0040] Figure 6 Shown Figure 1 The enlarged view of the part at I in the middle. The inner diameter of the expanded diameter portion 312' is larger than the inner diameter of the main body portion 311', and the inner diameter of the expanded diameter portion 312' is smaller than the outer diameter of the main body portion 311'. When the sealing portion 3121' of the valve core 31' abuts against the sealing ring 13, the valve body component 30' includes an inner lining portion 34', and the inner lining portion 34' is roughly annular. The minimum gap between the inner wall of the regulator 35' and the outer wall of the expanded diameter portion 312' is X1', and the minimum gap between the outer wall of the inner extension wall 34' and the inner wall of the expanded diameter portion 312' is X2', then X1'﹤1mm, X2'﹤1mm. With such a design, when the fluid enters in the forward direction, the fluid flows from the gap between the inner wall of the self-regulator 35' and the outer wall of the expanded diameter portion 312' through the gap between the outer wall of the lining portion 34' and the inner wall of the expanded diameter portion 312', which helps to balance the fluid pressure on the valve core component 30', reduce the pressure difference on the valve core component 30', and improve the operation reliability of the flow control valve. In addition, the fluid pressure on the valve core component 30' can be further adjusted by adjusting the size of X1' and X2'. As a specific solution, X1'﹤0.3mm and X2'﹤0.3mm can be designed.

[0041] In more specific schemes, Figure 2 As shown, the sealing ring seat 12' includes an annular groove portion 121', the sealing ring 13' is placed in the annular groove portion 121', the inner wall of the annular groove portion 121' extends axially upward to form the aforementioned inner lining portion 34', the outer wall of the annular groove portion 121' extends axially upward to form a fixing portion 36', and the lower end of the regulator 35' includes a radial flange portion 351' extending radially outward, the radial flange portion 351' at least partially covers the sealing ring 13', and can play a role in limiting the sealing ring 13'. The radial flange portion 351' is fixed to the fixing portion 36' by riveting. Figure 6The state shown in the figure is when the fixing part 36' is not riveted. A step part 341' with a step surface facing downward can be provided on the outer wall of the lining part 34' so as to abut against the inner edge of the sealing ring 13' and improve the stress deformation of the sealing ring 13'.

[0042] It should be noted that the lining portion 34' may not be directly formed by the sealing ring seat, but may be formed by an additional part, for example, by a circular bushing fixed to the sealing ring seat by welding or riveting, etc. This is also within the protection scope of the present invention.

[0043] It should be noted that in the above-mentioned embodiments, the specific shape of the sealing portion is not limited as long as the purpose of the present invention can be achieved. Figure 6 As shown, the lower end surface is an annular plane. At this time, the inner edge of the annular plane serves as the sealing inner edge ring line, and the outer edge of the annular plane serves as the sealing outer edge ring line. Figure 7 FIG. 1 is a partial schematic diagram of the first modified example of the sealing ring and the valve core. Figure 7 As shown, the sealing portion 3121 a' includes a first protrusion 1a' and a second protrusion 1b' arranged at intervals, and the side of the first protrusion 1a' close to the center line of the valve core 31 includes a sealing inner edge ring line 3121A', and the side of the second protrusion 1b' away from the center line of the valve core 31' includes a sealing outer edge ring line 3121B'.

[0044] In addition, in the above embodiments, the shape of the sealing ring 13' is not specifically limited, and it can also be the following structures: Figure 8 The second modified embodiment of the sealing ring is shown as a partial schematic diagram of the cooperation with the valve core. As shown in the figure, the sealing ring 13a' can include a recessed portion 131a' as shown in the cross-sectional view, and the sealing portion 3121' of the valve core 31' extends into the recessed portion 131a'. At this time, the sealing inner edge ring line 3121A' and the sealing outer edge ring line 3121B' of the sealing portion 3121' abut against the recessed portion 131a'. Fig. 9 The third modified embodiment of the sealing ring is shown as a partial schematic diagram of the cooperation with the valve core. As shown in the figure, the sealing ring 13b' can include a recessed portion 131b' as shown in the cross-sectional view, and the sealing portion 3121' of the valve core 31' extends into the recessed portion 131b'. At this time, the sealing inner edge ring line 3121' and the sealing outer edge ring line 3121' of the sealing portion 3121' abut against the recessed portion 131b. The difference between the recessed portion 131a' and the recessed portion 131b' is that Fig. 9 In the embodiment, the inclination angle of the inner wall of the recessed portion 131 b ′ located outside the valve core 31 ′ is greater than the inclination angle of the inner wall of the recessed portion 131 b ′ located inside the valve core 31 ′. Fig.10The fourth modified embodiment of the sealing ring is shown as a partial schematic diagram of the cooperation with the valve core. As shown in the figure, the sealing ring 13c' can include a recessed portion 131c' as shown in the cross-sectional view, and the sealing portion 3121' of the valve core 31' extends into the recessed portion 131c'. At this time, the sealing inner edge ring line 3121A' and the sealing outer edge ring line 3121B' of the sealing portion 3121' abut against the recessed portion 131c'. The difference between the recessed portion 131c' and the recessed portion 131b' is that Fig.10 In the embodiment, the inclination angle of the inner wall of the recessed portion 131c' located inside the valve core 31' is greater than the inclination angle of the inner wall of the recessed portion 131c' located outside the valve core 31'.

[0045] Fig.11 The figure shows a structural schematic diagram of another flow control valve provided by the present invention. The flow control valve of this solution is specifically a solenoid valve, which is mainly different from the flow control valves of the above-mentioned embodiments in that: In the solenoid valve, its control component includes a static iron core 100a' and a moving iron core 100b'. The moving iron core can drive the valve core component to move along the axial direction of the moving iron core.

[0046] The flow control valve provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A flow control valve, comprising a valve body component and a valve core component, the valve body component comprising a sealing seat component, a sealing ring, a first fluid port and a second fluid port, the sealing seat component comprising a sealing seat and a sealing component limitedly connected to the sealing seat, the inner edge of the sealing component abuts against the valve core component, the valve core component comprising a valve core, the valve core comprising a body part and an expanded diameter part arranged below the body part, the body part and the expanded diameter part are substantially annular, the outer diameter of the expanded diameter part is larger than the outer diameter of the body part, the lower end of the expanded diameter part comprises a sealing part, the valve core component can slide relative to the sealing seat component to make the sealing part abut against or separate from the sealing ring; The valve core component includes a balancing flow path. When the sealing portion abuts against the sealing ring, the flow control valve includes a first cavity located 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 and the second cavity are communicated with each other through the balancing flow path. When the sealing portion abuts against the sealing ring, the sealing portion includes a sealing inner edge ring line and a sealing outer edge ring line. The projection ring line of the outer edge of the main body in the vertical direction of the sealing ring is located between the sealing inner edge ring line and the sealing outer edge ring line. An inner annular surface is defined between the sealing inner edge ring line and the projection ring line, and the area of ​​the inner annular surface is S. 内’ , define an outer annular surface formed between the sealing outer edge ring line and the projection ring line, and the area of ​​the outer annular surface is S 外’ , then S 外’ =S 内’ .

2. The flow control valve according to claim 1, characterized in that: The valve core also includes a transition portion, one end of which is connected to the main body portion, and the other end of which is connected to the expanded diameter portion. The outer wall of the transition portion is roughly inclined, and the outer diameter of the upper end of the transition portion is smaller than the outer diameter of the lower end of the transition portion.

3. The flow control valve according to claim 1 or 2, characterized in that: The expanded diameter portion includes a first section and a second section arranged below the first section, the inner wall of the first section is roughly set with a constant diameter, the outer wall of the first section is roughly set with a constant diameter, the inner wall of the second section is set in an inclined shape, and the inner diameter of the upper end of the inner wall of the second section is smaller than the inner diameter of the lower end of the inner wall of the second section.

4. The flow control valve according to claim 3, characterized in that: The valve body component includes a valve body, the lower end of the sealing seat extends into the inner cavity of the valve body, the sealing seat is roughly cylindrical, and the sealing seat includes a limiting step portion with the step surface facing downward. The sealing component is located on the limiting step portion, the outer edge of the sealing component abuts against the sealing seat, and the inner edge of the sealing component abuts against the outer wall of the valve core.

5. The flow control valve according to claim 3, characterized in that: The valve body component comprises a sealing ring seat with an inner hole, the sealing ring seat is arranged in the inner cavity of the valve body, the sealing ring is arranged on the sealing ring seat, and the sealing ring is fixedly connected to the sealing ring seat.

6. The flow control valve according to claim 5, characterized in that: The flow control valve is an electronic expansion valve, which includes a transmission component, which includes a screw and a nut. The nut can drive the valve core component to move axially, and the outer wall of the nut can slide with the inner wall clearance of the guide hole of the sealing seat. The valve body component also includes a regulator, which is fixedly connected to the sealing ring seat, and the valve core can move axially relative to the regulating channel of the regulator to adjust the flow area between the first fluid port and the second fluid port.

7. The flow control valve according to claim 6, characterized in that: The inner diameter of the expanded diameter portion is larger than the inner diameter of the main body portion, and the inner diameter of the expanded diameter portion is smaller than the outer diameter of the main body portion; the valve body component also includes a regulator, which is fixedly connected to the sealing ring seat, and the valve core can move relative to the regulating channel of the regulator to adjust the flow area between the first fluid port and the second fluid port; the valve body component includes a lining portion, which is roughly annular, and the minimum gap between the inner wall of the regulator and the outer wall of the expanded diameter portion is X1', and the minimum gap between the outer wall of the lining portion and the inner wall of the expanded diameter portion is X2', then X1'﹤1mm, X2'﹤1mm.

8. The flow control valve according to claim 7, characterized in that: The sealing ring seat includes an annular groove portion, the sealing ring is placed in the annular groove portion, the inner wall of the annular groove portion extends axially upward to form the lining portion, the outer wall of the annular groove portion extends axially upward to form a fixing portion, and the lower end of the regulator includes a radial flange portion, and the radial flange portion is fixedly connected to the fixing portion.

9. The flow control valve according to claim 7, characterized in that: X1'﹤0.3mm, X2'﹤0.3mm.

10. The flow control valve according to claim 1 or 2, characterized in that: The flow control valve is an electronic expansion valve, which includes a transmission component, which includes a screw and a nut. The valve core component also includes a nut cover that cooperates with the nut, and a connecting piece fixedly connected to the nut cover and the valve core. The connecting piece includes a cylindrical portion and a plate-like portion. The plate-like portion includes a middle flow blocking portion and a connecting channel arranged outside the flow blocking portion. The nut cover includes a accommodating chamber, and the balancing flow channel of the flow control valve includes the accommodating chamber.

11. The flow control valve according to claim 1 or 2, characterized in that: The flow control valve is a solenoid valve, which includes a control component. The control component includes a static iron core and a moving iron core. The moving iron core can drive the valve core component to move axially.

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