Electric valve

Abstract

The utility model provides an electrically operated valve which comprises a valve seat structure, a valve core structure, a valve core structure, a valve core structure, a valve core structure and a valve core structure, the valve seat structure is provided with a valve cavity, and the side wall of the valve cavity is provided with a circulation port; the guide sleeve is arranged in the valve cavity, the periphery of the end, facing the valve port, of the guide sleeve is provided with a flow guide face, the flow guide face is an annular arc face, the size of the flow guide face in the axial direction is h, the radius of the periphery, away from the valve port, of the flow guide face is r1, the radius of the periphery, close to the valve port, of the flow guide face is r2, and h > r1-r2 > 0; and the valve element structure is arranged in the guide sleeve in a sliding mode, the valve element structure is used for opening and closing the valve port and adjusting the opening degree of the valve port, and the valve port is communicated with the circulation port under the condition that the valve port is opened. By means of the arrangement, stable and efficient flowing of fluid in the valve cavity is achieved, and noise generated when the fluid flows is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, specifically, an electric valve. BACKGROUND

[0002] At present, for the electric valve in the prior art, a guide sleeve is arranged in the cavity of the valve seat structure, a valve core structure is slidably arranged in the guide sleeve, and the valve core structure is used for opening and closing the valve port and adjusting the opening degree.

[0003] In the prior art, when fluid flows into the valve cavity from the valve port or flows into the valve port from the valve cavity, the fluid flow is concentrated and the flow rate is high when the fluid passes around the valve port, the fluid washes the edges at the valve port or the guide sleeve, and thus a large noise is generated. SUMMARY

[0004] The utility model provides an electric valve to solve the problem of noise generated when fluid flows in the electric valve in the prior art.

[0005] In order to solve the above problems, the utility model provides an electric valve, which comprises: a valve seat structure, the valve seat structure has a valve cavity, the side wall of the valve cavity has a flow-through port, and the bottom wall of the valve cavity has a valve port; a guide sleeve arranged in the valve cavity, the outer periphery of one end of the guide sleeve towards the valve port has a flow guide surface, the flow guide surface is an annular curved surface, the axial dimension of the flow guide surface is h, the radius of the periphery of the flow guide surface away from the valve port is r1, and the radius of the periphery of the flow guide surface close to the valve port is r2, wherein h>r1-r2>0; a valve core structure slidably arranged in the guide sleeve, the valve core structure is used for opening and closing the valve port and adjusting the opening degree of the valve port, and the valve port is in communication with the flow-through port when the valve port is open.

[0006] Further, the flow guide surface is an arc surface protruding from inside to outside in the radial direction, or the flow guide surface is an arc surface concave from outside to inside in the radial direction.

[0007] Further, 1.17mm≤h≤1.29mm; and / or, 0.1mm≤r1-r2≤0.5mm.

[0008] Further, the flow guide surface is a rotary curved surface, the rotary axis of the flow guide surface is collinear with the axis of the valve port, the generatrix of the flow guide surface is a circular arc, the radius of the circular arc is r, and 2.5mm≤r≤4mm.

[0009] Further, the guide sleeve comprises a first sleeve segment and a second sleeve segment connected with each other, the inner diameters of the first sleeve segment and the second sleeve segment are equal, the outer diameter of the first sleeve segment is greater than that of the second sleeve segment, the outer wall of the first sleeve segment is fixedly connected with the inner wall of the valve cavity, the flow guide surface is located at one end of the second sleeve segment towards the valve port, and the flow-through port faces at least part of the outer surface of the second sleeve segment.

[0010] Further, the wall thickness of the second sleeve section is 0.6mm to 1mm.

[0011] Further, the inner wall of the valve port has an annular matching surface for matching with the valve core structure, and the end of the valve port towards the valve cavity has an annular chamfer surface between the valve cavity and the matching surface.

[0012] Further, the axial dimension of the chamfer surface is 0.2mm to 1mm; and / or, the chamfer surface is a tapered surface, and the taper angle of the chamfer surface is 30° to 90°.

[0013] Further, the matching surface is a tapered surface or an arc surface, and the end with larger diameter of the matching surface is connected with the end with smaller diameter of the chamfer surface.

[0014] Further, the valve core structure comprises a valve stem and a valve needle, the valve needle is slidably arranged in the guide sleeve, the valve stem drives the valve needle to move back and forth, the end of the valve needle is used for opening and closing the valve port and adjusting the opening degree of the valve port, and the outer wall of the valve needle and the inner wall of the guide sleeve are sealingly matched.

[0015] The technical scheme of the utility model is applied, the valve seat structure has a valve cavity, the side wall of the valve cavity has a flow-through port, and the bottom wall has a valve port, so that the valve seat structure can accommodate the valve core structure and provide a stable fluid passage. The guide sleeve can ensure smooth movement of the valve core structure, reduce deviation of the valve core structure, avoid the situation that adjustment of the valve port is not in place due to friction, and ensure that opening and closing of the valve port is more stable and accurate. The outer periphery of the end of the guide sleeve towards the valve port has a flow guide surface, and the flow guide surface is an annular arc surface, which helps fluid to flow more smoothly and uniformly when passing through the valve port, reducing noise when the fluid flows. The radius of the periphery of the flow guide surface away from the valve port is r1, and the radius of the periphery of the flow guide surface close to the valve port is r2, wherein h>r1-r2>0, by setting the relationship between the axial dimension and the radial dimension of the flow guide surface, the mode and flow of fluid passing through the valve port can be accurately controlled. When h>r1-r2>0, it is ensured that the fluid can flow through an appropriate angle and path, thereby reducing flow resistance and noise generated during flow. Through the above setting, the fluid flows smoothly and efficiently in the valve cavity, reducing the noise generated when the fluid flows. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application, serve to explain the present application. In the drawings:

[0017] Figure 1 A structure schematic view of an electric valve provided by the embodiment one of the present application is shown;

[0018] Figure 2 A partial enlarged view in Figure 1 is shown.

[0019] Figure 3 A structure diagram of the electric valve provided by the second embodiment of the utility model is shown.

[0020] Figure 4 A partial enlarged view in Figure 3 is shown.

[0021] Figure 5 A noise distribution nephogram of the existing electric valve is shown.

[0022] Figure 6 A noise distribution nephogram of the electric valve of the first embodiment of the utility model is shown.

[0023] Among them, the above-mentioned drawings include the following signs:

[0024] 10, valve seat structure; 11, valve cavity;

[0025] 20, flow-through port;

[0026] 30, valve port; 31, mating surface, 32, chamfered surface;

[0027] 40, guide sleeve; 41, flow guide surface; 42, first sleeve section; 43, second sleeve section;

[0028] 50, valve core structure; 51 valve stem; 52, valve needle. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0030] As Figures 1 to 2As shown, the utility model discloses an electric valve, comprising: valve seat structure 10, valve seat structure 10 has valve cavity 11, the lateral wall of valve cavity 11 has flow pass 20, and the bottom wall of valve cavity 11 has valve port 30;Guide sleeve 40 is arranged in valve cavity 11, and the outer periphery of the one end of guide sleeve 40 towards valve port 30 has flow guide surface 41, and flow guide surface 41 is annular camber, and the axial dimension of flow guide surface 41 is h, and the radius of the circumference of flow guide surface 41 away from valve port 30 is r1, and the radius of the circumference of flow guide surface 41 close to valve port 30 is r2, wherein, h>r1-r2>0;Valve core structure 50 is slidably arranged in guide sleeve 40, and valve core structure 50 can be close to or away from valve port 30 along the axial direction of electric valve to adjust the opening of valve port 30, and valve port 30 is communicated with flow pass 20 under the condition of being opened.

[0031] In the embodiment, valve seat structure 10 has valve cavity 11, the lateral wall of valve cavity 11 has flow pass 20, and the bottom wall has valve port 30, which can make valve seat structure 10 can accommodate valve core structure 50 and provide a stable fluid passage. Guide sleeve 40 can ensure the smooth movement of valve core structure 50, reduce the deviation of valve core structure 50, avoid the adjustment of valve port 30 due to friction, and ensure that the opening and closing of valve port 30 is more stable and accurate. The outer periphery of the one end of guide sleeve 40 towards valve port 30 has flow guide surface 41, and flow guide surface 41 is annular camber, which helps the fluid to flow more smoothly and uniformly when flowing through valve port 30, and reduces the noise of fluid flow. The radius of the circumference of flow guide surface 41 away from valve port 30 is r1, and the radius of the circumference of flow guide surface 41 close to valve port 30 is r2, wherein, h>r1-r2>0, by setting the relationship between the axial dimension and the radial dimension of the flow guide surface, the flow mode and flow rate of the fluid flowing through valve port 30 can be accurately controlled. When h>r1-r2>0, it ensures that the fluid can flow through the appropriate angle and path, thereby reducing the flow resistance and noise generated in the flow. Through the above setting, the smooth and efficient flow of fluid in valve cavity 11 is realized, and the noise generated when the fluid flows is reduced.

[0032] Further, flow guide surface 41 is an arc surface that protrudes radially from inside to outside, or flow guide surface 41 is an arc surface that is concave radially from outside to inside.

[0033] In the embodiment, flow guide surface 41 is an arc surface that protrudes radially from inside to outside, so that the fluid gradually expands from inside to outside when contacting flow guide surface 41, increasing the space for fluid flow. Since flow guide surface 41 gradually increases, it helps the fluid to flow more smoothly and uniformly when flowing through valve port 30, and can effectively reduce the noise caused by excessive flow rate. Alternatively, flow guide surface 41 is an arc surface that is concave radially from outside to inside, and the concave flow guide surface 41 helps the fluid to flow more smoothly and uniformly when flowing through valve port 30. The fluid changes along flow guide surface 41 when flowing through this area, so that the fluid can transition smoothly, reducing the noise generated during the flow process.

[0034] In the guide sleeve 40 with a relatively thin wall thickness, the flow guide surface 41 is arranged as an arc surface protruding radially from inside to outside, which is beneficial to ensure the structural strength.

[0035] Specifically, 1.17mm≤h≤1.29mm; and / or, 0.1mm≤r1-r2≤0.5mm. In the embodiment, h is the dimension of the flow guide surface 41 in the axial direction, representing the distance between the end of the flow guide surface 41 close to the valve port 30 and the edge away from the valve port 30. The axial dimension h of the flow guide surface 41 can directly affect the flow mode of the fluid when flowing through the valve port 30, and by reasonably designing the size of h, the flow resistance of the fluid can be reduced. The size range of h in 1.17mm≤h≤1.29mm can provide sufficient flow area while ensuring smooth guidance of the fluid when the valve port 30 is opened, avoiding excessive fluctuation. If h is too small, it may cause poor fluid flow, resulting in a large current, which in turn affects the performance of the valve port 30; while h is too large, it may cause excessive flow and reduce control accuracy.

[0036] r1 and r2 are the radii of the flow guide surface 41 close to and away from the valve port 30, respectively. The difference between r1-r2 can measure the degree of change of the flow guide surface 41 at different positions, which can affect the flow path of the fluid. By adjusting the value of r1-r2, the flow rate distribution of the fluid can be adjusted. If r1-r2 is large, the fluid will have a large flow rate difference when flowing through the flow guide surface 41, which may cause uneven fluid flow. While a smaller r1-r2 can provide a smoother flow path, making the fluid flow rate distribution more uniform and reducing flow resistance.

[0037] The present scheme can optimize the fluid flow path by setting reasonable h and r1-r2 values, reduce the current and uneven flow, so that the fluid flows more smoothly and efficiently when flowing through the guide sleeve 40 in the forward and reverse directions, reducing the noise generated by the fluid flow.

[0038] In the embodiment, the flow guide surface 41 is a rotational surface, the rotation axis of the flow guide surface 41 is collinear with the axis of the valve port 30, and the generatrix of the flow guide surface 41 is a circular arc with a radius r, and 2.5mm≤r≤4mm.

[0039] In the embodiment, the flow guide surface 41 is a rotary curved surface, which can reduce the sudden change of flow rate and irregular flow of fluid when passing through the valve port 30. When fluid flows through the rotary curved surface, more uniform guidance can be obtained, thereby reducing the eddy current in the flow, and reducing the noise generated in the fluid flow. The generatrix of the flow guide surface 41 is a circular arc, and the radius of the circular arc is r, 2.5mm≤r≤4mm, which can ensure that the fluid does not encounter a large flow resistance change during the flow process, so that the flow rate can be uniformly distributed, and the stability of the fluid flow can be maintained, and the noise generated in the fluid flow process can be reduced.

[0040] As shown in Figure 1 The guide sleeve 40 includes a first sleeve segment 42 and a second sleeve segment 43 connected to each other, the inner diameters of the first sleeve segment 42 and the second sleeve segment 43 are equal, the outer diameter of the first sleeve segment 42 is larger than the outer diameter of the second sleeve segment 43, the outer wall of the first sleeve segment 42 is fixedly connected with the inner wall of the valve cavity 11, the flow guide surface 41 is located at one end of the second sleeve segment 43 facing the valve port 30, and the flow passage 20 faces the outer surface of the second sleeve segment 43.

[0041] In the embodiment, the inner diameter of the second sleeve segment 43 is equal to the inner diameter of the first sleeve segment 42, which is helpful for guiding the valve core structure 50 to move smoothly. The outer diameter of the first sleeve segment 42 is larger than the outer diameter of the second sleeve segment 43, which can tightly fix the outer wall of the first sleeve segment 42 with the inner wall of the valve cavity 11, thereby providing more stable and firm support, which can ensure that the guide sleeve 40 does not relatively displace or loosen in the valve cavity 11. The inner wall of the guide sleeve 40 and the valve cavity 11 can be fixedly connected by welding or interference fit. Moreover, the outer diameter of the first sleeve segment 42 is larger, which is helpful for bearing and dispersing the pressure and impact generated in the fluid flow process, thereby enhancing the reliability of the entire electric valve.

[0042] The flow guide surface 41 is located at one end of the second sleeve segment 43 facing the valve port 30, which can accurately guide the fluid to output through the valve port 30, or guide the fluid to flow into the valve port 30. The flow passage 20 faces at least part of the outer surface of the second sleeve segment 43, so that the fluid can be guided along the outer wall of the guide sleeve 40 after entering the valve cavity 11, which can ensure that the fluid contacts the guide sleeve 40 more smoothly when passing through the flow passage 20, thereby helping to guide the fluid to pass through the valve cavity 11 smoothly without changing the flow direction sharply. Moreover, through the above arrangement, the structure of the electric valve and the fluid flow path are optimized, and the noise generated by the fluid in the electric valve during the flow process is reduced. Furthermore, the flow passage 20 faces at least part of the outer surface of the second sleeve segment 43, which can block or reduce the fluid from directly impacting the valve core structure 50, thereby avoiding the valve core structure 50 from shaking and improving the structural stability.

[0043] Further, the wall thickness of the second sleeve section 43 is 0.6mm to 1mm. In the embodiment, the wall thickness of the second sleeve section 43 is designed in the range of 0.6mm to 1mm, which can ensure compact structure and provide sufficient strength, and is not easily damaged by external impact or internal fluid pressure, and can reduce the vibration and instability caused by the fluid passing through, thereby reducing the noise generated during fluid flow. Moreover, the wall thickness of the second sleeve section 43 is 0.6mm to 1mm, which can also prevent product damage caused by interference with the inserted pipe of the flow passage 20. If the wall thickness of the second sleeve section 43 is too thick, it will cause flow resistance to the fluid, which can be avoided by the above setting.

[0044] As shown in Figure 1 , the valve core structure 50 includes a valve stem 51 and a valve needle 52, the valve needle 52 is slidably arranged in the guide sleeve 40, the valve stem 51 drives the valve needle 52 to move back and forth, the end of the valve needle 52 is used to open and close the valve port 30 and adjust the opening degree of the valve port 30, and the outer wall of the valve needle 52 and the inner wall of the guide sleeve 40 are in sealing fit.

[0045] In the embodiment, the valve needle 52 is slidably arranged in the guide sleeve 40, and the sliding fit between the valve needle 52 and the guide sleeve 40 can effectively reduce the friction. The valve stem 51 drives the valve needle 52 to move back and forth, and the end of the valve needle 52 is used to open and close the valve port 30 and adjust the opening degree of the valve port 30, and by controlling the movement of the valve stem 51 and the valve needle 52, the opening degree of the valve port 30 can be quickly and accurately adjusted. The outer wall of the valve needle 52 and the inner wall of the guide sleeve 40 are in sealing fit, which effectively prevents fluid leakage through the gap between the valve core structure 50 and the guide sleeve 40. Moreover, the sliding fit between the valve needle 52 and the guide sleeve 40 not only can reduce the friction, but also can reduce the noise generated during opening and closing. When opening and closing the valve port 30, due to the smooth movement of the valve needle 52, the impact force between the valve core structure 50 and the valve seat structure 10 is reduced, thereby reducing the noise generated during operation.

[0046] As shown in Figure 5 and Figure 6 , it can be seen from the simulation cloud data that the noise peak value of the electric valve in the prior art is as high as 96.5dB, and the noise above 90dB belongs to severe noise, which will have a very serious impact on the user, and long-term exposure to such an environment will even cause irreversible damage to the body. The electric valve optimized by the first embodiment of the present scheme can reduce the noise peak value from 96.5dB to 85.4dB, reduce the impact on the user, and will not cause serious damage, and has obvious improvement on the working environment and noise reduction effect.

[0047] As shown in Figure 3 and Figure 4As shown in the second embodiment provided in the present solution, on the basis of the above-mentioned embodiment, the inner wall of the valve port 30 has an annular matching surface 31 for matching with the valve core structure 50, and the end of the valve port 30 towards the valve cavity 11 has an annular chamfer surface 32 between the valve cavity 11 and the matching surface 31.

[0048] The annular matching surface 31 can be in contact with the valve core structure 50, and the pressure is uniformly distributed through the contact surface to ensure good sealing effect. Moreover, the chamfer surface 32 has a guiding effect on the fluid, so that the fluid can be more smoothly transitioned when entering or flowing out of the valve port 30, reducing the flow resistance caused by the contact of the fluid with the sharp corner. When the fluid enters or flows out of the valve cavity 11, it can more smoothly pass through the matching surface 31 of the valve port 30 and the valve core structure 50, reducing the flow resistance and the noise generated in the fluid flow process.

[0049] Specifically, when the fluid flows from the valve port 30 to the flow-through port 20, the design of the chamfer surface 32 increases the flow rate. The fluid slowly transitions through the matching surface 31 and the chamfer surface 32, and the fluid can spread to a larger space, so that the flow rate is reduced. After passing through the chamfer surface 32, the fluid is dispersed and will not concentrate on the flow guide surface 41 of the guide sleeve 40, nor will it flush the edge of the valve port 30, reducing noise. When the fluid flows from the flow-through port 20 to the valve port 30, the flow guide surface 41 on the guide sleeve 40 and the chamfer surface 32 at the valve port 30 can both guide and direct the flow, improving the flow state of the fluid, reducing resistance and noise.

[0050] Specifically, the axial dimension of the chamfer surface 32 is 0.2mm to 1mm; and / or, the chamfer surface 32 is a conical surface, and the taper angle of the chamfer surface 32 is 30° to 90°. The chamfer surface 32 is designed to have a certain axial dimension, so that the contact between the valve core structure 50 and the valve port 30 becomes smoother. When the valve core structure 50 is closed, the chamfer surface 32 can effectively guide the valve core structure 50 to accurately match with the valve port 30, reducing the deviation when contacting.

[0051] Moreover, the angle between the chamfer surface 32 and the bottom wall surface of the valve cavity 11 affects the angle and manner of sealing contact, and this angle range provides a smooth transition, so that the valve core structure 50 will not produce excessive impact when contacting the matching surface 31, reducing the noise generated in the fluid flow process.

[0052] As Figure 4As shown, the matching surface 31 is a tapered surface or an arc surface, and the large-diameter end of the matching surface 31 is connected with the small-diameter end of the chamfer surface 32. The tapered or arc matching surface can provide a larger contact area, so that the contact between the valve core structure 50 and the matching surface 31 is more uniform, avoiding the situation that the local pressure is too large or too small. Especially when the valve core structure 50 is in full contact with the valve port 30, the tapered or arc matching surface can form a more reliable sealing effect to prevent fluid leakage. The large-diameter end of the matching surface 31 is connected with the small-diameter end of the chamfer surface 32, which ensures that the valve core structure 50 will not produce a sharp impact when contacting the matching surface 31, and can provide stable sealing pressure, so that the fluid can be effectively isolated when the valve port 30 is closed, thereby enhancing the overall sealing effect.

[0053] Compared with the flat matching surface 31, the tapered or arc matching surface 31 can provide a more stable contact when the valve port 30 is opened and closed, and can reduce the noise caused by impact. In addition, it can effectively avoid the violent disturbance of the fluid when opening and closing, thereby reducing the noise and vibration caused by the fluid. Moreover, by using the tapered or arc matching surface 31, the opening degree of the valve port 30 can be more accurately adjusted when cooperating with the valve core structure 50, thereby accurately adjusting the flow size of the electric valve.

[0054] Compared with the existing electric valve without the chamfer surface 32 of the valve port 30, through multiple tests and comparisons, it can be found that the existing electric valve in the prior art produces normal continuous airflow sound when the opening degree is 0-65%, but when the opening degree is greater than 65%, a howling sound occurs, and the howling sound increases with the increase of the opening degree, which can cause damage to the user's hearing, and even cause serious impact on the body. The electric valve optimized by the second embodiment of the present application produces normal continuous airflow sound when the opening degree is 0-100%, which does not affect the user's hearing and body, and significantly improves the working environment and noise reduction effect.

[0055] The above is only an optional embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0056] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0057] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale of the actual proportions used in the fabrication, assembly, and operation of the example embodiments. Techniques, methods, and apparatus known to those of ordinary skill can not be discussed in detail herein, but should be considered as part of the description unless otherwise stated. In all examples shown and discussed herein, any specific values are to be interpreted as being exemplary only and not limiting. Other examples of example embodiments can therefore have different values. It is to be noted that like numbers and letters refer to like elements throughout the several views of the drawings and, as such, no further discussion with regard thereto is deemed necessary.

[0058] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by orientation words such as "front, back, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application. The orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0059] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one device or feature to another device or feature as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, then a device described as "above" or "up" of other devices or structures can be oriented "below" or "down" relative to such other devices or structures. Accordingly, the exemplary terms "above" and "below" can encompass both an orientation of above and below. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0060] In addition, it should be noted that the use of "first", "second", and the like, terminology to describe various components in the above description is used only for the convenience of the reader and is in no way intended to limit the scope of the application.

Claims

1. An electrically operated valve characterised in that, The valve seat structure (10) has a valve cavity (11), the side wall of the valve cavity (11) has a flow passage (20), and the bottom wall of the valve cavity (11) has a valve port (30). The guide sleeve (40) is provided in the valve cavity (11), and the outer periphery of one end of the guide sleeve (40) towards the valve port (30) has a flow guide surface (41), the flow guide surface (41) is an annular arc surface, the axial dimension of the flow guide surface (41) is h, the radius of the flow guide surface (41) away from the circumference of the valve port (30) is r1, and the radius of the flow guide surface (41) close to the circumference of the valve port (30) is r2, wherein h>r1-r2>0. The valve core structure (50) is slidably arranged in the guide sleeve (40), and the valve core structure (50) is used for opening and closing the valve port (30) and adjusting the opening degree of the valve port (30). The flow guide surface (41) is an arc surface protruding from inside to outside in the radial direction, or the flow guide surface (41) is an arc surface concave from outside to inside in the radial direction.

2. The motorized valve of claim 1, wherein, 3. The electric valve of claim 1, wherein, 1.17mm≤h≤1.29mm; and / or, 0.1mm≤r1-r2≤0.5mm. The flow guide surface (41) is a rotary curved surface, the rotation axis of the flow guide surface (41) is collinear with the axis of the valve port (30), the generatrix of the flow guide surface (41) is a circular arc, and the radius of the circular arc is r, 2.5mm≤r≤4mm.

4. The motorized valve of claim 1, wherein, The guide sleeve (40) comprises a first sleeve segment (42) and a second sleeve segment (43) connected to each other, the inner diameters of the first sleeve segment (42) and the second sleeve segment (43) are equal, the outer diameter of the first sleeve segment (42) is greater than the outer diameter of the second sleeve segment (43), the outer wall of the first sleeve segment (42) is fixedly connected with the inner wall of the valve cavity (11), the flow guide surface (41) is located at one end of the second sleeve segment (43) towards the valve port (30), and the flow passage (20) is towards the outer surface of at least part of the second sleeve segment (43).

5. The motorized valve of claim 1, wherein, The wall thickness of the second sleeve segment (43) is 0.6mm to 1mm.

6. The motorized valve of claim 5, wherein, The inner wall of the valve port (30) has an annular matching surface (31) for matching with the valve core structure (50), one end of the valve port (30) towards the valve cavity (11) has an annular chamfer surface (32), and the chamfer surface (32) is located between the valve cavity (11) and the matching surface (31).

7. The motorized valve of claim 1, wherein, 8. The electric valve of claim 7, wherein, The axial dimension of the chamfer surface (32) is 0.2mm to 1mm; and / or, The chamfer surface (32) is a conical surface, and the taper angle of the chamfer surface (32) is 30° to 90°. The matching surface (31) is a conical surface or an arc surface, and one end of the matching surface (31) with a large diameter is connected with one end of the chamfer surface (32) with a small diameter.

9. The motorized valve of claim 7, wherein, ​ 10. The motorized valve of claim 1, wherein, The valve core structure (50) comprises a valve stem (51) and a valve needle (52), the valve needle (52) is slidably arranged in the guide sleeve (40), the valve stem (51) drives the valve needle (52) to move back and forth, the end of the valve needle (52) is used for opening and closing the valve port (30) and adjusting the opening degree of the valve port (30), and the outer wall of the valve needle (52) and the inner wall of the guide sleeve (40) are in sealing cooperation.

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