Flow control valve

Abstract

The present invention provides a flow control valve, comprising a valve body and a valve head. The valve body has a valve port, and the inner wall of the valve port has a sealing surface and a first flow control surface. The angle between the sealing surface and the axis of the valve port is c, and the angle between the first flow control surface and the axis of the valve port is b, where c>b, 5°≤c≤85°, and 0≤b≤20°. The valve head is movably disposed within the valve body to close or open the valve port, wherein when the valve port is closed, the valve head and the sealing surface abut. With this solution, small flow rates can be adjusted by adjusting the relative positions of the valve head and the first flow control surface, and when closing the valve port, the valve port is closed by the cooperation of the sealing surface and the valve head, rather than by the flow control surface. That is, in this application, the flow control surface and the sealing surface are separately provided. Compared with the prior art, this avoids the valve head from becoming stuck when adjusting small flow values, thereby ensuring the effectiveness of the flow control valve.

Description

Technical Field

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

[0002] In a flow control valve, the valve head changes its relative position to the flow control surface on the inner wall of the valve orifice to adjust the flow area, thereby regulating flow. The flow characteristic curve shows the relationship between the flow rate of the flow control valve and the valve orifice opening (i.e., the distance the valve head moves). In actual use, different systems and operating conditions have different flow control requirements.

[0003] In the existing technology, in order to meet the requirements of small flow regulation, the angle of the flow regulating surface relative to the valve port axis is set to be relatively small, and the flow regulating surface serves as both a regulating surface and a mating surface for closing the valve port. When it is necessary to adjust to an extremely small flow value, the valve head and the flow regulating surface are prone to getting stuck, affecting normal use. Summary of the Invention

[0004] The present invention provides a flow regulating valve, which can achieve small flow regulation while avoiding the valve head from getting stuck, thereby ensuring the use effect.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a flow regulating valve, including: a valve body, the valve body having a valve port, the inner wall of the valve port having a sealing surface and a first flow regulating surface, the angle between the sealing surface and the axis of the valve port is c, the angle between the first flow regulating surface and the axis of the valve port is b, wherein c>b, 5°≤c≤85°, 0≤b≤20°; a valve head, movably arranged in the valve body to close or open the valve port, wherein, when the valve port is closed, the valve head and the sealing surface abut each other.

[0006] Furthermore, a minimum gap between the first flow regulating surface and the valve head is L, and L is ≥ 0.01 mm.

[0007] Furthermore, the inner wall of the valve port also has a second flow regulating surface, which is located on the side of the first flow regulating surface away from the sealing surface. The angle between the second flow regulating surface and the axis of the valve port is a, 0≤a<90°.

[0008] Furthermore, b=0,0 <a<90°。

[0009] Or, 0 <b≤20°,a=0。

[0010] Or, 0 <b≤20°,b<a<90°。

[0011] Or, 0 <b≤20°,0<a<b。

[0012] Furthermore, the sealing surface, the first flow regulating surface and the second flow regulating surface are all conical surfaces.

[0013] Furthermore, the sealing surface is a conical surface, the first flow regulating surface is a rotational curved surface, and the angle between the generatrix of the rotational curved surface and the axis of the valve port is b.

[0014] Furthermore, the valve body includes a seat body and a core body, the core body is detachably arranged in the seat body, and the core body has the valve port.

[0015] Furthermore, 30°≤c≤60°.

[0016] The technical solution of the present invention provides a flow control valve, comprising a valve body and a valve head. The valve body has a valve port, and the inner wall of the valve port has a sealing surface and a first flow control surface. The angle between the sealing surface and the axis of the valve port is c, and the angle between the first flow control surface and the axis of the valve port is b, where c>b, 5°≤c≤85°, and 0≤b≤20°. The valve head is movably disposed within the valve body to close or open the valve port. When the valve port is closed, the valve head and the sealing surface abut against each other. This solution allows for small flow rate regulation by adjusting the relative positions of the valve head and the first flow control surface, and when closing the valve port, the valve port is closed by the cooperation of the sealing surface and the valve head, rather than by the flow control surface. That is, in this application, the flow control surface and the sealing surface are separately provided. Compared with the prior art, this avoids the valve head from becoming stuck when adjusting small flow values, thereby ensuring the effectiveness of the flow control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A cross-sectional view of a flow control valve provided in the first embodiment of the present invention is shown;

[0019] Figure 2 Shown Figure 1 An enlarged view of the flow control valve at the valve port position;

[0020] Figure 3 An enlarged view of the flow control valve at the valve port provided by the second embodiment of the present invention is shown;

[0021] Figure 4 An enlarged view of the flow control valve provided in the third embodiment of the present invention at the valve port position is shown;

[0022] Figure 5 An enlarged view of the flow control valve at the valve port provided by the fourth embodiment of the present invention is shown;

[0023] Figure 6 An enlarged view of the flow control valve at the valve port provided by the fifth embodiment of the present invention is shown;

[0024] Figure 7 An enlarged view of the flow control valve at the valve port provided by the sixth embodiment of the present invention is shown;

[0025] Figure 8 A cross-sectional view of a flow control valve provided by a seventh embodiment of the present invention is shown;

[0026] Figure 9 A schematic diagram of a flow characteristic curve of a flow control valve provided in embodiment 4 of the present invention is shown.

[0027] The above drawings include the following reference numerals:

[0028] 10. Valve body; 11. Valve port; 12. Sealing surface; 13. First flow regulating surface; 14. Second flow regulating surface; 15. Seat body; 16. Core body; 20. Valve head. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative work are within the scope of protection of the present invention.

[0030] like Figures 1 to 2 As shown, an embodiment of the present invention provides a flow regulating valve, including: a valve body 10, the valve body 10 has a valve port 11, the inner wall of the valve port 11 has a sealing surface 12 and a first flow regulating surface 13, the angle between the sealing surface 12 and the axis of the valve port 11 is c, the angle between the first flow regulating surface 13 and the axis of the valve port 11 is b, wherein c>b, 5°≤c ≤85°, 0≤b≤20°; a valve head 20, movably arranged in the valve body 10 to close or open the valve port 11, wherein, when the valve port 11 is closed, the valve head 20 abuts against the sealing surface 12.

[0031] This solution, by setting a sealing surface 12 and a first flow regulating surface 13 and limiting the angle range and angle relationship, allows small flow regulation by adjusting the relative position of the valve head 20 and the first flow regulating surface 13. When closing the valve port 11, the valve port 11 is closed by the cooperation of the sealing surface 12 and the valve head 20, rather than by the flow regulating surface. In the present application, since c>b, the area of ​​the smallest opening of the sealing surface 12 is smaller than the area of ​​the smallest opening of the first flow regulating surface 13. As a result, the valve head 20 can easily contact and seal with the sealing surface 12 during movement, rather than completely contacting and becoming stuck with the first flow regulating surface 13. That is, in the present application, the flow regulating surface and the sealing surface are set separately, with the sealing surface 12 used for sealing and the first flow regulating surface 13 used for regulating flow. Compared with the prior art, this avoids the situation where the valve head 20 is easily stuck when adjusting small flow values, thereby ensuring the effectiveness of the flow regulating valve.

[0032] The flow regulating valve can be specifically used as an electronic expansion valve or other valves. In some usage scenarios, it is hoped that the flow rate in the front section of the flow regulating valve is extremely small, and the flow rate in the rear section is extremely large. By adopting the solution in the present application, the front section of the flow regulating valve can be used as an electronic expansion valve, and the rear section can be fully opened to be used as a solenoid valve. In this way, the electronic expansion valve and solenoid valve used in parallel in the prior art can be combined together, that is, one valve in the present application can replace two valves in the prior art, reducing costs. Alternatively, the flow regulating valve in the present application can also be used on low ambient temperature units. The typical flow characteristic requirement of low ambient temperature units is a broken line type, that is, the front section is used for low-temperature heating, requiring precise flow regulation, which can better stabilize the working conditions, and the rear section is used for cooling, with a larger flow value, requiring a larger flow characteristic. Therefore, the flow regulating valve provided by this solution can achieve specific flow regulation to meet usage requirements.

[0033] The minimum angle c between the sealing surface 12 and the axis of the valve port 11 is set to 5°, which can achieve better sealing performance. The maximum angle c between the sealing surface 12 and the axis of the valve port 11 is set to 85°, which can effectively shorten the flow section length at the sealing surface 12 and reduce the impact of the sealing surface 12 on the flow at the first flow regulating surface 13.

[0034] Preferably, 30°≤c≤60°, which can achieve a better sealing effect and a better flow regulation effect.

[0035] In this embodiment, there is a gap between the first flow regulating surface 13 and the valve head 20 to prevent the valve head 20 from getting stuck. Among them, the included angle b between the axis of the first flow regulating surface 13 and the valve port 11 can be set to 0 degree, so that there is flow when the flow regulating valve is fully closed, making the flow value at the fully closed position with flow more stable. When b is greater than 20°, the included angle between the first flow regulating surface 13 and the valve head 20 is already relatively large, and it is not easy to have problems such as getting stuck. At this time, the function of the sealing surface 12 is reduced. Therefore, in this solution, it is reasonable to set the included angle between the first flow regulating surface 13 and the axis of the valve port 11 to 0≤b≤20°.

[0036] Furthermore, the minimum gap between the first flow regulating surface 13 and the valve head 20 is L, and L≥0.01mm. With this setting, when the valve head 20 cooperates with the first flow regulating surface 13 for flow regulation, it can ensure that there is enough gap between the valve head 20 and the first flow regulating surface 13, thus avoiding getting stuck. Among them, L can be set to be less than or equal to 1mm. Specifically, L≥0.1mm.

[0037] In this embodiment, the inner wall of the valve port 11 further has a second flow regulating surface 14. The second flow regulating surface 14 is located on the side of the first flow regulating surface 13 away from the sealing surface 12. The included angle between the second flow regulating surface 14 and the axis of the valve port 11 is a, and 0≤a<90°. By setting the second flow regulating surface 14, when the valve head 20 moves from the position where it cooperates with the first flow regulating surface 13 to the position where it cooperates with the second flow regulating surface 14, the slope of the flow characteristic curve changes, that is, the flow regulation function is enriched to meet different usage requirements. For example, when the valve head 20 cooperates with the first flow regulating surface 13, it is for small flow regulation, and when the valve head 20 cooperates with the second flow regulating surface 14, it is for large flow regulation.

[0038] In this application, the angle b of the first flow regulating surface 13 and the angle a of the second flow regulating surface 14 can be set to different angle ranges according to different usage requirements, and the relationship between the two can be defined.

[0039] For example, as Figure 3 shown, in the second embodiment, b = 0, 0 < a < 90°.

[0040] As Figure 4 shown, in the third embodiment, 0 < b ≤ 20°, a = 0.

[0041] As Figure 5 shown, in the fourth embodiment, 0 < b ≤ 20°, b < a < 90°. As Figure 9Figure 2 shows a schematic diagram of the flow characteristic curve of the flow control valve. As can be seen from the figure, the flow characteristic curve is a broken line. When the valve head 20 contacts the sealing surface 12, there is no flow. (There is a certain amount of flow immediately after the valve head 20 leaves the sealing surface 12 and reaches the first flow control surface 13. This flow is extremely small and does not constitute a regulatory function; it is an objectively existing flow.) The stage in which the valve head 20 cooperates with the first flow control surface 13 is the front section, which has a shallow slope and enables precise flow control. The stage in which the valve head 20 cooperates with the second flow control surface 14 is the rear section, which has a steep slope and enables high flow.

[0042] like Figure 6 As shown, in Example 5, 0 <b≤20°,0<a<b。

[0043] In the above embodiment, the sealing surface 12, the first flow regulating surface 13, and the second flow regulating surface 14 are all tapered surfaces. This facilitates machining and allows for precise flow rate adjustment. Furthermore, the edges of the sealing surface 12, the first flow regulating surface 13, and the second flow regulating surface 14 are sequentially connected, ensuring a smooth transition during flow rate adjustment.

[0044] like Figure 7 As shown, in Example 6, the sealing surface 12 is a conical surface, the first flow regulating surface 13 is a curved surface of revolution, and the angle b between the generatrix of the curved surface of revolution and the axis of the valve port 11 is . With this arrangement, when the valve head 20 moves axially, the curved surface of revolution of the first flow regulating surface 13 enables nonlinear regulation, or what can be understood as variable rate regulation, to meet user requirements.

[0045] Furthermore, in the seventh embodiment, unlike the previous embodiments, the valve body 10 comprises a seat 15 and a core 16. The core 16 is removably mounted within the seat 15 and has a valve port 11. Specifically, the core 16 with the valve port 11 in this embodiment is removable. This allows for individual replacement of the core 16 with a different valve port 11 to meet varying flow characteristics. This significantly expands the adaptability of the flow control valve. Further design changes eliminate the need to replace all components; only the valve port 11 needs to be redesigned, improving component versatility and reducing design and manufacturing costs.

[0046] Optionally, the seat body 15 has a first limiting step, and the core body 16 has a second limiting step, and the first limiting step and the second limiting step are matched to limit each other, which facilitates positioning and assembly.

[0047] The flow regulating valve also includes: a guide sleeve, which is arranged in the valve body 10, and the valve head 20 is movably arranged in the guide sleeve, and a sealing structure is provided between the valve head 20 and the guide sleeve; a driving part, which is driven and connected to the valve head 20 to drive the valve head 20 to move.

[0048] Specifically, the flow regulating valve is an electronic expansion valve.

[0049] In this application, by providing a sealing surface 12 and a first flow regulating surface 13, and defining an angular range and relationship between them, small flow rates can be adjusted by adjusting the relative position of the valve head 20 and the first flow regulating surface 13. When closing the valve port 11, the valve port 11 is closed by the cooperation of the sealing surface 12 and the valve head 20, rather than by the flow regulating surface. In other words, the flow regulating surface and the sealing surface are provided separately in this application. Compared with the prior art, this avoids the possibility of the valve head 20 becoming stuck when adjusting small flow rates, thus ensuring the effectiveness of the electronic expansion valve.

[0050] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0053] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

Claims

1. A flow control valve, characterized in that: include: A valve body (10), wherein the valve body (10) has a valve port (11), the inner wall of the valve port (11) has a sealing surface (12), a first flow regulating surface (13) and a second flow regulating surface (14), the second flow regulating surface (14) is located on a side of the first flow regulating surface (13) away from the sealing surface (12), the angle between the second flow regulating surface (14) and the axis of the valve port (11) is a, 0≤a<90°, the angle between the sealing surface (12) and the axis of the valve port (11) is c, and the angle between the first flow regulating surface (13) and the axis of the valve port (11) is b, wherein c>b, 30°≤c≤60°, and 0≤b≤20°; a valve head (20) movably disposed in the valve body (10) to close or open the valve port (11), wherein when the valve port (11) is closed, the valve head (20) abuts against the sealing surface (12); The minimum gap between the first flow regulating surface (13) and the valve head (20) is L, and L is ≥ 0.01 mm.

2. The flow control valve according to claim 1, characterized in that: b=0,0 <a<90°。 3. The flow control valve according to claim 1, characterized in that: 0 <b≤20°,a=0。 4. The flow control valve according to claim 1, characterized in that: 0 <b≤20°,b<a<90°。 5. The flow control valve according to claim 1, characterized in that: 0 <b≤20°,0<a<b。 6. The flow control valve according to claim 1, characterized in that: The sealing surface (12), the first flow regulating surface (13) and the second flow regulating surface (14) are all conical surfaces.

7. The flow control valve according to claim 1, characterized in that: The sealing surface (12) is a conical surface, the first flow regulating surface (13) is a rotational curved surface, and the angle between the generatrix of the rotational curved surface and the axis of the valve port (11) is b.

8. The flow control valve according to claim 1, characterized in that: The valve body (10) comprises a seat body (15) and a core body (16); the core body (16) is detachably arranged in the seat body (15); and the core body (16) has the valve port (11).

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