Valve device

Abstract

The valve device is provided with a fluid inlet and a fluid outlet and is characterized in that the valve device comprises a mandrel, an abutting seat and a valve element component, the valve element component is provided with a groove, at least part of the abutting seat is located in the groove, the abutting seat is provided with a first through opening, the mandrel penetrates through the first through opening, and the mandrel penetrates through the second through opening. The valve device is provided with a first gap, at least part of the first gap is located between the mandrel and the opening inner wall corresponding to the first through opening, or at least part of the first gap is located between the abutting seat and the groove inner wall corresponding to the groove; the valve element component is provided with a first channel, the first gap is communicated with the fluid inlet, the first channel is communicated with the fluid outlet, and the first gap can be communicated with the first channel. According to the valve device, the small-flow opening degree can be achieved, and the requirement for the small-flow opening degree of the valve under the specific working condition is met.

Description

Technical Field

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

[0002] Valves are widely used in production and daily life. It is a device that uses a moving part to open, close, or partially block one or more openings or channels, so that liquid flow, air flow, or other gas flows or a large amount of loose materials can flow out, be blocked, or be regulated.

[0003] A valve in the related art controls the opening and closing of the valve outlet by the rotation of a motor. However, due to factors such as the error in the number of rotation steps of the motor or the assembly error, it is difficult to meet the demand for the small flow opening of the valve under specific working conditions. Summary of the Invention

[0004] The purpose of the present invention is to at least solve the problems in the background art and propose a valve device.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] A valve device, the valve device has a fluid inlet and a fluid outlet, the valve device includes a mandrel, a contact seat, and a valve core component. The valve core component has a groove, at least part of the contact seat is located in the groove, the contact seat has a through first through-hole, the mandrel passes through the first through-hole, the valve device has a first gap, at least part of the first gap is located between the mandrel and the inner wall of the port corresponding to the first through-hole, or at least part of the first gap is located between the contact seat and the inner wall of the groove corresponding to the groove;

[0007] The valve core component has a first channel, the first gap communicates with the fluid inlet, the first channel communicates with the fluid outlet, and the first gap can communicate with the first channel.

[0008] In the valve device of the above technical scheme, the first gap communicates with the fluid inlet, the first channel communicates with the fluid outlet, and the first gap can communicate with the first channel, so that the fluid can enter the first channel through the first gap from the fluid inlet, and then flow out through the fluid outlet from the first channel. The small flow opening of the valve device is realized through the first gap, and the demand for the small flow opening of the valve under specific working conditions is met.

[0009] The features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. Brief Description of the Drawings

[0010] The following further describes the present invention with reference to the drawings and specific embodiments:

[0011] Figure 1 Schematic diagram of the cross-sectional structure of a valve device according to an embodiment;

[0012] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0013] Figure 3 A schematic structural diagram showing another embodiment in which the first gap is located on the inner wall of the groove corresponding to the abutment seat and the groove;

[0014] Figure 4 is a schematic cross-sectional structural diagram of a valve device according to another embodiment;

[0015] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at B in the middle;

[0016] Figure 6 A schematic cross-sectional view showing the structure of the mandrel in the second position in another embodiment;

[0017] Figure 7 is a schematic cross-sectional view of a valve device according to yet another embodiment;

[0018] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at C in the middle;

[0019] Figure 9 is a partial cross-sectional schematic diagram of a valve device according to another embodiment;

[0020] Figure 10 This is a schematic structural diagram of an abutment seat according to an embodiment;

[0021] Figure 11 A schematic structural diagram of an abutment seat according to another embodiment;

[0022] Figure 12 Schematic diagram of the structure of a valve device according to an embodiment.

[0023] Reference numerals:

[0024] 1. Base, 101. Fluid inlet, 102. Fluid outlet, 103. Second balancing hole; 11. Extension portion, 12. Seat body; 2. Shell, 3. Core shaft, 301. Extension portion, 4. Valve core component, 401. First channel, 5. Spring seat, 501. Second channel, 6. Abutment seat, 61. Fixing cap; 62. Abutment body, 601. First opening, 7. First balancing hole, 8. Nut, 801. Stud body, 802. Fixing seat, 9. Limiting seat, 10. Spring, 11. Valve inner cavity, 12. Groove, 13. First gap, 14. Second gap. DETAILED DESCRIPTION

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention. In addition, it should be understood that the following terms indicating orientation or positional relationships, such as "upper", "lower", "left", "right", "longitudinal", "lateral", "inner", "outer", "vertical", "horizontal", "top", "bottom", etc., are only based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0026] As Figures 1 - 12 shown, a valve device in an embodiment has a fluid inlet 101 and a fluid outlet 102. The valve device includes a mandrel 3, a contact seat 6 and a valve core component 4. The valve core component 4 has a groove 12. At least a part of the contact seat 6 is located in the groove 12. The contact seat 6 has a through first port 601. The mandrel 3 passes through the first port 601. The valve device has a first gap 13. At least a part of the first gap 13 is located between the mandrel 3 and the inner wall of the port corresponding to the first port 601, or at least a part of the first gap 13 is located between the contact seat 6 and the inner wall of the groove corresponding to the groove 12.

[0027] The valve core component 4 has a first channel 401. The first gap 13 is communicated with the fluid inlet 101. The first channel 401 is communicated with the fluid outlet 102. The first gap 13 can be communicated with the first channel 401.

[0028] The mandrel 3 of the valve device drives the valve core component 4 to displace in the axial direction. When the side wall of the lower end of the valve core component 4 abuts and seals against the inner wall of the port corresponding to the fluid outlet 102, the first gap 13 can still be communicated with the first channel 401. At this time, the fluid flows through the fluid inlet 101, the first gap 13, and the first channel 401 and flows out of the fluid outlet 102. The first gap 13 restricts the flow rate of the valve device, thereby realizing the small-flow conduction of the valve device and meeting the demand for the small-flow opening of the valve device under specific working conditions. For example, in some air conditioner uses, the environmental load is low, and the purpose of the air conditioner is to maintain the regional temperature stable. At this time, a very small opening of the valve is required. When the valve core component 4 is far from the fluid outlet 102, the fluid outlet 102 of the valve device is fully open, and at this time, the demand for the large-flow opening of the valve device is met.

[0029] In one embodiment, the mandrel 3 is rotated by a motor, and an axial displacement occurs during the rotation of the mandrel 3. Of course, a stator and a rotor can also be provided in the valve device. The valve core component 4 is fixed to the rotor, and the mandrel 3 is rotated by electronically controlling the rotation of the rotor. The driving and axial displacement structure of the mandrel 3 can adopt conventional structures in the art and will not be elaborated here. This application mainly makes a creative improvement on the small-flow opening structure of the valve device, and the small-flow opening structure of the valve device will be mainly elaborated below.

[0030] As Figures 1 - 8 shown, the abutting seat 6 and the corresponding groove wall of the groove 12 can be fixed by welding or the like. A first channel 401 is formed in the valve core component 4 by means of punching or the like. The groove 12 is located at one end of the valve core component 4 away from the fluid outlet 102. A part of the mandrel 3 passes through the first through hole 601 of the abutting seat 6 and is located in the groove 12. When the mandrel 3 axially displaces upward, the valve core component 4 is driven to axially displace upward through the contact between the mandrel 3 and the abutting seat 6. The valve core component 4 moves away from the fluid outlet 102, thereby realizing the full opening of the fluid outlet 102. When the mandrel 3 axially displaces downward, the mandrel 3 directly or indirectly pushes the valve core component 4 to axially displace downward, so that the side wall of the lower end of the valve core component 4 abuts against the inner wall of the corresponding port of the fluid outlet 102 for sealing. At this time, the fluid can only flow out of the fluid outlet 102 through the fluid inlet 101, the first gap 13, and the first channel 401, realizing the conduction of a small flow rate of the valve device.

[0031] As Figure 1 、 Figure 2 、 Figure 10 shown, in one embodiment, the first gap 13 is located between the mandrel 3 and the inner wall of the corresponding port of the first through hole 601. The first through hole 601 of the abutting seat 6 and the mandrel 3 can be formed by precision machining or the like, so that the gap between the first through hole 601 and the mandrel 3 is relatively precise. A part of the mandrel 3 is located in the first through hole 601 and is in clearance fit with the inner wall of the corresponding port of the first through hole 601 to form the first gap 13. The total cross-sectional area of the first gap 13 is S, and S satisfies 0.05mm 2 ≤S≤0.5mm 2 , to meet the requirements of a small flow rate. It can be understood that a part of the mandrel 3 is located in the first through hole 601, so that the first gap 13 is integrally annular, and the total cross-sectional area of the first gap 13 is the cross-sectional area of this annular gap.

[0032] As Figure 3 、 Figure 11As shown, in another embodiment, the first gap 13 is located between the abutting seat 6 and the corresponding inner wall of the groove 12. The abutting seat 6 and the groove 12 can be formed by means of precision machining or the like, so that the clearance fit between the abutting seat 6 and the groove 12 is relatively precise. A part of the outer wall of the abutting seat 6 and a part of the corresponding inner wall of the groove 12 can be fixed by means of welding or the like. The gap between another part of the outer wall of the abutting seat 6 and another part of the corresponding inner wall of the groove 12 forms the first gap 13. Similarly, the total cross-sectional area S of the first gap 13 satisfies 0.05mm 2 ≤S≤0.5mm 2 . At this time, a dynamic seal can be achieved between the mandrel 3 and the corresponding inner wall of the first through-port 601. Specifically, the outer surface of the mandrel 3 can be designed as a thin film or a coating process can be adopted to balance sealing and reduce friction.

[0033] In another embodiment, part of the first gap 13 is located between the mandrel 3 and the corresponding inner wall of the first through-port 601, and part of the first gap 13 is located between the abutting seat 6 and the corresponding inner wall of the groove 12.

[0034] The valve device is generally driven by an electric motor pulse to drive the valve core component 4 to axially displace to open or close the fluid outlet 102. The conventional electric motor pulse drive is very likely to exceed the flow rate corresponding to the small range of opening; in this application, throttling is carried out by setting the first gap 13, which can solve the axial displacement deviation of the mandrel 3 caused by too much or too little rotation of the mandrel 3 controlled by the pulse steps of the motor in the related art, and even the axial displacement deviation of the mandrel 3 caused by the unit pulse steps of the motor; during the axial displacement of the mandrel 3 driven by the rotation of the motor, the first gap 13 always exists and its total cross-sectional area S always satisfies 0.05mm 2 ≤S≤0.5mm 2 . Preferably, the total cross-sectional area S of the first gap 13 satisfies 0.1mm 2 ≤S≤0.2mm 2 . That is, when the valve device has a small flow rate requirement, when the valve core component 4 abuts against the fluid outlet 102, the flow through the first gap 13 can meet the required small flow rate requirement.

[0035] In one embodiment, the valve device includes a base 1 and a housing 2. The fluid inlet 101 and the fluid outlet 102 are located on the base 1. The base 1 can be an integral part or a relatively fixed split part. The housing 2 is relatively fixed to the base, and the housing 2 and the base 1 form a valve inner cavity.

[0036] Such as Figures 1 - 8As shown, in one embodiment, the valve device includes a limit seat 9, at least a part of the limit seat 9 is located in the groove 12, the limit seat 9 is fixed or limited to the mandrel 3, the mandrel 3 has at least a first state and a second state. In the first state, the main body of the mandrel 3 directly or indirectly abuts against the valve core component 4, there is a second gap 14 between the limit seat 9 and the abutting seat 6, the second gap 14 communicates with the first gap 13, and the second gap 14 communicates with the first channel 401; in the second state, the limit seat 9 directly or indirectly abuts against the abutting seat 6.

[0037] The limit seat 9 is fixed to one end of the mandrel 3 located in the groove 12, the limit seat 9 is located in the groove 12. In the first state, the mandrel 3 directly abuts against the bottom of the groove 12 or indirectly abuts through an elastic member such as a spring 10, so that the side wall of the lower end of the valve core component 4 abuts against the inner wall of the orifice of the fluid outlet 102. At this time, the side wall of the lower end of the valve core component 4 is sealed with the inner wall of the orifice corresponding to the fluid outlet 102, and there is a second gap 14 between the limit seat 9 and the abutting seat 6. The second gap 14 communicates with the first gap 13, and the second gap 14 communicates with the first channel 401. Thus, the first gap 13 communicates with the first channel 401 to realize the small-flow conduction of the valve device; during the process of switching from the first state to the second state, after the mandrel 3 axially displaces upward by a certain distance, the limit seat 9 directly or indirectly abuts against the abutting seat 6, thereby driving the valve core component 4 to displace upward, and the valve core component 4 moves away from the fluid outlet 102, thus realizing the fully open state of the fluid outlet 102 of the valve device.

[0038] It can be understood that in the first state, there is a certain distance or gap between the limit seat 9 and the abutting seat 6, that is, the above-mentioned second gap 14. The fluid can pass through this distance or gap from the gap between the mandrel 3 and the inner wall of the orifice corresponding to the first through-port 601, and then flow into the groove 12 and finally flow out of the fluid outlet 102 through the first channel 401.

[0039] The valve device generally drives the valve core component 4 to axially displace to open or close the fluid outlet 102 through motor pulses. As the valve core component 4 moves, different opening degrees can be adjusted. Since the valve core component 4 has a spring, the motor pulses often have a certain overage. By compressing the spring, the stable closed state of the valve core component 4 can be realized. Therefore, when opening the valve, it is difficult to adjust a small flow rate through the motor pulses. In this application, throttling is carried out by setting the first gap 13, which can effectively solve the deficiency of adjusting a small flow rate through motor pulses in the related art.

[0040] In one embodiment, the valve device includes a nut 8, the nut 8 is located on the outer periphery of at least a part of the mandrel 3, the mandrel 3 is in threaded cooperation with the nut 8, the mandrel 3 can rotate relative to the nut 8, the nut 8 has a first balance hole 7, the first balance hole 7 communicates with the first gap 13, and the first balance hole 7 communicates with the fluid inlet 101.

[0041] It is understandable that the mandrel 3 rotates relative to the nut 8 and can undergo axial displacement, thereby driving the axial displacement of the valve core component 4. The first balance hole 7 communicates the first gap 13 with the fluid inlet 101, so that the fluid can enter the valve inner cavity 11 from the fluid inlet 101, then flow through the first balance hole 7 through the first gap 13, and finally flow out from the fluid outlet 102 through the first channel 401.

[0042] Furthermore, the nut 8 includes a stud main body portion 801 and a fixing seat 802. The fixing seat 802 is fixed relative to the base 1. The stud main body portion 801 is located on the outer periphery of at least part of the mandrel 3. The mandrel 3 can rotate relative to the stud main body portion 801. The first balance hole 7 is located on the side wall portion of the fixing seat 802.

[0043] The stud main body portion 801 and the fixing seat 802 are integrally formed or fixed. The stud main body portion 801 is hollow and has an internal nut 8. The mandrel 3 has a corresponding external thread. There is a space between the inner wall of the fixing seat 802 and the mandrel 3, and this space communicates the first balance hole 7 with the first gap 13. The fixing seat 802 can be fixed to the base 1 by welding or other means.

[0044] In one embodiment, the valve device has a valve inner cavity 11. The base 1 has a second balance hole 103. The second balance hole 103 communicates with the valve inner cavity 11, and the valve inner cavity 11 communicates with the first balance hole 7.

[0045] Specifically, as Figure 12 shown, the base 1 has an extension portion 11 and a seat body main portion 12. The fluid inlet 101 and the fluid outlet 102 are located on the extension portion 11. The extension portion 11 and the seat body main portion 12 form a step. The second balance hole 103 is located on the step surface portion of the seat body main portion 12 facing the extension portion 11. The fluid enters the valve inner cavity 11 through the second balance hole 103. In other embodiments, the second balance hole 103 can also be located on the side wall portion of the seat body main portion 12. It is understandable that when the valve device is in use, it cooperates with an external valve seat. The fluid enters the inner cavity of the valve seat and then flows into the fluid inlet 101 and the second balance hole 103. The second balance hole 103 can communicate with the fluid inlet 101 through the inner cavity of the valve seat.

[0046] As Figures 1 - 8 shown, in one embodiment, the valve device includes a spring 10. One end of the spring 10 abuts against the limit seat 9, and the other end of the spring 10 abuts against the valve core component 4. The mandrel 3 can block the first channel 401. The mandrel 3 has a first position, a second position, and a third position. When the mandrel 3 is in the first position, as Figure 4 、 Figure 5 shown, the valve core component 4 abuts against the inner wall of the mouth of the fluid outlet 102. The mandrel 3 blocks the first channel 401, and the spring 10 is in a compressed state; when the mandrel 3 is in the second position, asFigure 6 As shown, the valve core component 4 abuts against the inner wall of the orifice of the fluid outlet 102, there is a spacing between the core shaft 3 and the valve core component 4, and the spring 10 is in a compressed state; when the core shaft 3 is in the third position, there is a distance between the valve core component 4 and the inner wall of the orifice corresponding to the fluid outlet 102, and there is a spacing between the core shaft 3 and the valve core component 4.

[0047] In one embodiment, the core shaft 3 axially displaces downward to compress the spring 10. Under the force of the spring 10, the valve core component 4 axially displaces downward accordingly. When the side wall of the lower end of the valve core component 4 just abuts and seals against the inner wall of the orifice corresponding to the fluid outlet 102, there is still a certain distance between the core shaft 3 and the valve core component 4, that is, the first channel 401 is in communication with the first gap 13. At this time, the valve device is in a small-flow conduction state, as Figure 6 shown; when the core shaft 3 continues to axially displace downward, the spring 10 between the core shaft 3 and the valve core component 4 continues to be compressed until the core shaft 3 blocks the first channel 401. At this time, the valve device is fully closed, as Figure 4 、 Figure 5 shown; when the core shaft 3 axially displaces upward, it drives the valve core component 4 to axially displace upward to fully open the valve device. In this embodiment, the valve device has at least three states, which can respectively achieve three flow states of small-flow conduction, valve closing, and full opening of the valve. In this implementation manner, when there is a throttling requirement, by moving the valve core component 4 in the axial direction, the size of the throttling channel between the valve core component 4 and the base 1 can be adjusted to regulate the flow rate of the fluid flowing through the valve device. When there is a valve closing requirement, by abutting the valve core component 4 against the base 1, the throttling channel is closed, and at the same time the core shaft 3 blocks the first channel 401, so that the first gap cannot be used to conduct the fluid inlet 101 and the fluid outlet 102, realizing the closed state of the valve device. When there is a small-flow requirement, the valve core component 4 abuts against the base 1 to close the throttling channel. By axially moving the core shaft 3, a channel is formed between the core shaft 3 and the valve core component 4, so that the first gap 13 can be used to conduct the fluid inlet 101 and the fluid outlet 102, realizing the small-flow requirement of the valve device.

[0048] As Figure 4 、 Figure 5 、 Figure 7 、 Figure 8As shown, in one embodiment, the core shaft 3 has an extension portion 301, which protrudes toward the first channel 401, and the extension portion 301 can block the first channel 401. When the core shaft 3 is in the first position, the valve core component 4 is against the inner wall of the fluid outlet 102, the extension portion 301 blocks the first channel 401, and the spring 10 is in a compressed state; when the core shaft 3 is in the second position, the valve core component 4 is against the inner wall of the fluid outlet 102, the extension portion 301 and the valve core component 4 have a distance, and the spring 10 is in a compressed state; when the core shaft 3 is in the third position, the valve core component 4 has a distance from the inner wall of the port corresponding to the fluid outlet 102, and the extension portion 301 and the valve core component 4 have a distance.

[0049] Preferably, the extension portion 301 needs to cooperate with the first channel 401, so that the core shaft 3 is longer as a whole. Therefore, the groove 12 is set shallower to avoid the core shaft 3 being too long as a whole and affecting its coaxiality with the valve core component 4. Figure 4 shown.

[0050] The extension 301 is integral with or fixed to the core shaft 3. Of course, in other embodiments, such as Figure 1 As shown, the extension portion 301 may be eliminated. When the side wall of the lower end portion of the valve core component 4 is sealed against the inner wall of the port corresponding to the fluid outlet 102, the small flow of the valve device is always conducted.

[0051] like Figure 7 、 Figure 8 As shown, in one embodiment, the valve device includes a spring 10 and a spring seat 5, the spring seat 5 is located in the groove 12, one end of the spring 10 is against the spring seat 5, and the other end of the spring 10 is against the core shaft 3, the spring seat 5 has a second channel 501, the second channel 501 is connected to the first channel 401, and the core shaft 3 has an extension portion 301, the extension portion 301 can block the second channel 501, or the extension portion 301 is gap-fitted with the inner wall of the channel corresponding to the second channel 501.

[0052] In one embodiment, the spring seat 5 is generally shaped like a boss, which facilitates stable engagement with the spring 10. One end of the spring 10 is inserted into the small-diameter portion of the boss-shaped spring seat 5 and abuts against the large-diameter portion, while the other end of the spring 10 abuts against the core shaft 3. The core shaft 3 is axially displaced downward to compress the spring 10. Under the force of the spring 10, the valve core component 4 is subsequently axially displaced downward. When the side wall of the lower end of the valve core component 4 and the inner wall of the port corresponding to the fluid outlet 102 just abut and seal, there is still a certain distance between the extension 301 and the second channel 501 of the spring seat 5. At this time, the valve device is open at a low flow rate. When the core shaft 3 continues to move axially downward, the spring 10 between the core shaft 3 and the valve core component 4 continues to be compressed until the extension 301 blocks the second channel 501, at which point the valve device is fully closed.

[0053] In one embodiment, one end of the valve core component 4 facing the fluid outlet 102 has a throttling portion, and the throttling portion is integrally conical. In this way, during the axial displacement of the valve core component 4, the valve core component 4 can block the fluid outlet 102 to different degrees for throttling. When a part of the conical throttling portion is located at the fluid outlet 102, at any corresponding position of the valve core component 4, the valve device corresponds to a certain flow rate.

[0054] The valve core component 4 can be integrally provided. Of course, the valve core component 4 can also be separately provided. In one embodiment, the valve core component 4 includes a valve core main body portion 41 and a sleeve portion 42. The sleeve portion 42 is relatively fixed to the valve core main body portion 41, and at least part of the groove 12 is located in the sleeve portion 42. As Figure 9 shown. In other embodiments, the valve core main body portion 41 can also be hung on the sleeve portion 42 and be relatively limited in position with the sleeve portion 42. In this embodiment, the groove 12 can be formed jointly by the sleeve portion 42 and the valve core main body portion 41.

[0055] As Figure 3 、 Figure 11 shown, in one embodiment, a part of the outer wall of the abutting seat 6 is fixed to the inner wall of the groove 12, and the first gap 13 is located between a part of the outer wall of the abutting seat 6 and the inner wall of the groove 12. In one embodiment, the outer wall of the abutting seat 6 is welded and fixed to the corresponding inner wall of the groove 12 at intervals. Of course, in other embodiments, a part of the continuous outer wall of the abutting seat 6 is fixed to the corresponding inner wall of the groove 12 by welding or other means, and there is a first gap 13 between another part of the continuous outer wall of the abutting seat 6 and the corresponding inner wall of the groove 12.

[0056] As Figure 10 、 Figure 11 shown, the abutting seat 6 includes an abutting main body 62 and a fixing cap 61. The abutting main body 62 and the fixing cap 61 are integrated or fixed. In one embodiment, the fixing cap 61 is annular and can be placed at the upper end of the groove 12 for limiting, which is convenient for welding the abutting seat 6 and the valve core component 4; in another embodiment, the fixing cap 61 can also be arc-shaped. On the one hand, it can realize its limitation with the upper end of the groove 12, and on the other hand, it can realize retaining the gap between a part of the outer wall of the abutting seat 6 and the corresponding inner wall of the groove 12, that is, it can realize the communication between the first gap 13 and the fluid inlet 101, and the communication between the first gap 13 and the first channel 401.

[0057] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes to obtain technical solutions, concepts, and designs, which should all be covered by the protection scope of the present invention.

Claims

1. A valve device having a fluid inlet (101) and a fluid outlet (102), characterized in that, The valve device includes a mandrel (3), an abutting seat (6) and a valve core component (4). The valve core component (4) has a groove (12), at least part of the abutting seat (6) is located in the groove (12). The abutting seat (6) has a through first port (601), the mandrel (3) passes through the first port (601). The valve device has a first gap (13), at least part of the first gap (13) is located between the mandrel (3) and the inner wall of the port corresponding to the first port (601), or at least part of the first gap (13) is located between the abutting seat (6) and the inner wall of the groove corresponding to the groove (12). The valve core component (4) has a first channel (401). The first gap (13) communicates with the fluid inlet (101), the first channel (401) communicates with the fluid outlet (102), and the first gap (13) can communicate with the first channel (401).

2. The valve device according to claim 1, characterized in that, The total cross-sectional area of the first gap (13) is S, and S satisfies 0.05 mm 2 ≤ S ≤ 0.5 mm 2 .

3. The valve device according to claim 1 or 2, characterized in that, The valve device includes a limit seat (9), at least part of the limit seat (9) is located in the groove (12). The limit seat (9) is fixed or limited to the mandrel (3). The mandrel (3) has at least a first state and a second state. In the first state, the mandrel (3) abuts directly or indirectly against the valve core component (4). The limit seat (9) and the abutting seat (6) have a second gap (14), the second gap (14) communicates with the first gap (13), and the second gap (14) communicates with the first channel (401). In the second state, the limit seat (9) abuts directly or indirectly against the abutting seat (6).

4. The valve device according to claim 1, characterized in that, The valve device includes a nut (8), the nut (8) is located on the outer periphery of at least part of the mandrel (3). The mandrel (3) is in threaded cooperation with the nut (8), and the mandrel (3) can rotate relative to the nut (8). The nut (8) has a first balance hole (7), the first balance hole (7) communicates with the first gap (13), and the first balance hole (7) communicates with the fluid inlet (101).

5. The valve device according to claim 4, characterized in that, The nut (8) includes a stud main body portion (801) and a fixing seat (802). The valve device includes a base (1), the fixing seat (802) is fixed relative to the base (1). The stud main body portion (801) is located on the outer periphery of at least part of the mandrel (3), and the mandrel (3) can rotate relative to the stud main body portion (801). The first balance hole (7) is located on the side wall portion of the fixing seat (802).

6. The valve device according to claim 5, characterized in that, The valve device has a valve inner cavity (11), the base (1) has a second balance hole (103), the second balance hole (103) communicates with the valve inner cavity (11), and the valve inner cavity (11) communicates with the first balance hole (7).

7. The valve device according to claim 4 or 5 or 6, characterized in that, The valve device includes a spring (10), one end of the spring (10) abuts against the limit seat (9), the other end of the spring (10) abuts against the valve core component (4), the core shaft (3) can block the first channel (401), the core shaft (3) has a first position, a second position, and a third position. When the core shaft (3) is in the first position, the valve core component (4) abuts against the inner wall of the orifice of the fluid outlet (102), the core shaft (3) blocks the first channel (401), and the spring (10) is in a compressed state; when the core shaft (3) is in the second position, the valve core component (4) abuts against the inner wall of the orifice of the fluid outlet (102), there is a gap between the core shaft (3) and the valve core component (4), and the spring (10) is in a compressed state; when the core shaft (3) is in the third position, there is a distance between the valve core component (4) and the inner wall of the orifice corresponding to the fluid outlet (102), and there is a gap between the core shaft (3) and the valve core component (4).

8. The valve device according to claim 7, characterized in that, The core shaft (3) has an extending portion (301), the extending portion (301) protrudes towards the first channel (401), the extending portion (301) can block the first channel (401). When the core shaft (3) is in the first position, the valve core component (4) abuts against the inner wall of the orifice of the fluid outlet (102), the extending portion (301) blocks the first channel (401), and the spring (10) is in a compressed state; when the core shaft (3) is in the second position, the valve core component (4) abuts against the inner wall of the orifice of the fluid outlet (102), there is a gap between the extending portion (301) and the valve core component (4), and the spring (10) is in a compressed state; when the core shaft (3) is in the third position, there is a distance between the valve core component (4) and the inner wall of the orifice corresponding to the fluid outlet (102), and there is a gap between the extending portion (301) and the valve core component (4).

9. The valve device according to claim 1 or 2 or 4 or 5 or 6 or 8, characterized in that, The valve device includes a spring (10) and a spring seat (5), the spring seat (5) is located in the groove (12), one end of the spring (10) abuts against the spring seat (5), the other end of the spring (10) abuts against the core shaft (3), the spring seat (5) has a second channel (501), the second channel (501) communicates with the first channel (401), the main body of the core shaft (3) has an extending portion (301), and the extending portion (301) can block the second channel (501); and / or, the valve device has a base, the valve core component (4) can move relative to the base, and there is a throttling channel between the valve core and the base; and / or, the valve core component (4) is integrally provided or the valve core component (4) includes a valve core main body portion and a sleeve portion, the sleeve portion is relatively fixed to the valve core main body portion, and at least part of the groove (12) is located in the sleeve portion.

10. The valve device according to claim 1 or 2 or 4 or 5 or 6 or 8, characterized in that, Part of the outer wall of the abutting seat (6) is fixed to the inner wall of the groove (12), and the first gap (13) is located between the part of the outer wall of the abutting seat (6) and the inner wall of the groove (12).

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