Electric valve

Abstract

The present invention provides an electric valve, which comprises a valve seat, a valve needle, a first valve core and a second valve core; the valve seat has a valve cavity; the valve needle is movably arranged in the valve cavity; the first valve core is arranged in the valve cavity and has a first through hole, and its material is a non-metallic material. The first valve core is located between the valve needle and the opening of the valve cavity; the second valve core is arranged in the valve cavity and has a second through hole, and its material is a metallic material. The second valve core is adjacent to the side of the first valve core facing the valve needle, and the second through hole and the first through hole together form a valve port; wherein, when the electric valve is in the fully closed state, the valve needle passes through the second through hole and contacts the hole wall of the first through hole to form a seal.

Description

Technical Field

[0001] The present invention relates to the technical field of electric valves, and particularly to an electric valve. Background Art

[0002] In order to avoid the leakage problem of the valve port, existing electric valves usually adopt soft sealing to achieve the sealing of the valve port. However, due to the above design, the valve core of the existing electric valve has the following disadvantages: it is difficult to achieve flow regulation with a soft-sealed valve port, and the processing difficulty is high. Summary of the Invention

[0003] A main object of the present invention is to overcome at least one defect of the above existing technology, and provide an electric valve that can meet the flow regulation requirements on the premise of ensuring the sealing effect of the valve port.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] According to one aspect of the present invention, there is provided an electric valve, wherein the electric valve includes a valve seat, a valve needle, a first valve core, and a second valve core; the valve seat has a valve cavity; the valve needle is movably disposed in the valve cavity; the first valve core is disposed in the valve cavity and has a first through hole, and its material is a non-metallic material, and the first valve core is located between the valve needle and the opening of the valve cavity; the second valve core is disposed in the valve cavity and has a second through hole, and its material is a metallic material, and the second valve core is adjacent to the side of the first valve core facing the valve needle, and the second through hole and the first through hole together form a valve port; wherein, in the fully closed state of the electric valve, the valve needle passes through the second through hole and contacts the inner wall of the first through hole to form a seal.

[0006] According to one embodiment of the present invention, the inner diameter of the port of the valve port facing the valve needle is greater than the inner diameter of the port facing away from the valve needle, and the inner wall of the valve port smoothly transitions between the two ports.

[0007] According to one embodiment of the present invention, the inner diameter of the orifice of the first through hole facing the valve needle is less than or equal to the inner diameter of the orifice of the second through hole facing away from the valve needle.

[0008] According to one embodiment of the present invention, the inner diameter of the orifice of the first through hole facing the valve needle is greater than the inner diameter of the orifice facing away from the valve needle, and the inner wall of the first through hole smoothly transitions between the two orifices; and / or, the inner diameter of the orifice of the second through hole facing the valve needle is greater than the inner diameter of the orifice facing away from the valve needle, and the inner wall of the second through hole smoothly transitions between the two orifices.

[0009] According to one embodiment of the present invention, the inner wall of the valve port is bevel-shaped or arc-shaped.

[0010] According to one embodiment of the present invention, along the axial direction of the valve seat, the thickness of the first valve core is greater than the thickness of the second valve core.

[0011] According to one embodiment of the present invention, a first annular groove is formed at the periphery of the orifice on the side of the first through hole of the first valve core facing away from the valve needle.

[0012] According to one embodiment of the present invention, a second annular groove is formed at the periphery of the orifice on the side of the second through hole of the second valve core facing the valve needle.

[0013] According to one embodiment of the present invention, the material of the first valve core is PTFE, PPS, PEAK or nylon; and / or, the material of the second valve core is stainless steel.

[0014] According to one embodiment of the present invention, the electric valve further includes a valve core sleeve; the valve core sleeve is partially disposed in the valve cavity and is adjacent to the side of the first valve core facing away from the valve needle, and the valve core sleeve is provided with a through channel, and the channel communicates with the valve port.

[0015] From the above technical solutions, the advantages and positive effects of the electric valve proposed by the present invention are as follows:

[0016] The electric valve proposed by the present invention forms a valve port by combining a first valve core and a second valve core. By selecting a non-metallic material for the first valve core, when the first valve core contacts the valve needle, soft contact between the valve needle and the first valve core can be achieved, thereby ensuring a good sealing effect between the valve needle and the valve port. On this basis, by selecting a metal material for the second valve core and taking advantage of the characteristic that the metal material is less affected by environmental factors such as temperature, the required slope or arc can be machined on the inner wall of the second valve core, so that the second valve core can meet the flow regulation requirements of a specific flow curve, further improving the regulation accuracy of the electric valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings, various objects, features and advantages of the present invention will become more apparent. The drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always represent the same or similar components. Among them:

[0018] Figure 1 is a perspective exploded view of an electric valve shown according to an exemplary embodiment;

[0019] Figure 2 isFigure 1 Cross-sectional schematic diagram of the shown electric valve;

[0020] Figure 3 is Figure 2 Enlarged cross-sectional schematic diagram of a part of the structure of the shown electric valve;

[0021] Figure 4 is Figure 3 Exploded schematic diagram of the shown part of the structure;

[0022] Figure 5 is Figure 3 Enlarged schematic diagram of part A in

[0023] Explanation of reference numerals is as follows:

[0024] 100. Valve seat;

[0025] 110. Valve cavity;

[0026] 120. Flow-through hole;

[0027] 200. Valve needle;

[0028] 210. Balance channel;

[0029] 310. First valve core;

[0030] 311. First through hole;

[0031] 312. First annular groove;

[0032] 320. Second valve core;

[0033] 321. Second through hole;

[0034] 322. Second annular groove;

[0035] 400. Valve core sleeve;

[0036] 510. Mounting base;

[0037] 520. Sleeve;

[0038] 610. Rotor assembly;

[0039] 620. Nut assembly;

[0040] 630. Screw;

[0041] 640. Spring sleeve;

[0042] 641. Balance hole;

[0043] 650. Spring;

[0044] 660. Rotating part;

[0045] X. Axial direction. Detailed implementation manners

[0046] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments, all of which do not depart from the scope of the present invention, and the descriptions and drawings therein are for illustrative purposes in essence and not for limiting the present invention.

[0047] In the following description of different exemplary embodiments of the present invention, reference is made to the accompanying drawings, which form a part of the present invention and in which are shown, by way of example, different exemplary structures, systems, and steps that can implement various aspects of the present invention. It should be understood that other specific solutions of components, structures, exemplary devices, systems, and steps can be used and structural and functional modifications can be made without departing from the scope of the present invention. Moreover, although terms such as "above", "between", "inside", etc. may be used in this specification to describe different exemplary features and elements of the present invention, these terms are used herein only for convenience, for example, according to the directions of the examples described in the drawings. Nothing in this specification should be construed as requiring a specific three-dimensional direction of the structure to fall within the scope of the present invention.

[0048] Refer to Figure 1 , which representatively shows an exploded perspective view of an electric valve proposed by the present invention. In this exemplary embodiment, the electric valve proposed by the present invention is described by taking an electronic expansion valve as an example. It is easily understood by those skilled in the art that, in order to apply the relevant designs of the present invention to other types of electric valves or other valve devices, various modifications, additions, substitutions, deletions, or other changes are made to the following specific implementation manners, and these changes are still within the scope of the principle of the electric valve proposed by the present invention.

[0049] As Figure 1 shown, in this embodiment, the electric valve proposed by the present invention includes a valve seat 100, a valve needle 200, a first valve core 310, and a second valve core 320. Referring in conjunction with Figures 2 to 5 , Figure 2 representatively shows a cross-sectional view of the electric valve that can embody the principle of the present invention; Figure 3 representatively shows an enlarged cross-sectional view of a part of the structure of the electric valve that can embody the principle of the present invention; Figure 4 representatively shows Figure 3 an exploded view of the part of the structure shown in Figure 5 representatively shows Figure 3 an enlarged view of part A in The structures, connection manners, and functional relationships of the main components of the electric valve proposed by the present invention will be described in detail below with reference to the above-mentioned drawings.

[0050] As shown Figures 1 to 5 in the present embodiment, the valve seat 100 has a valve cavity 110. The valve needle 200 is movably disposed in the valve cavity 110 and can be driven by a driving mechanism so that the valve needle 200 can move along the axial direction X of the valve seat 100. The first valve core 310 is disposed in the valve cavity 110 and has a first through hole 311. The material of the first valve core 310 is a non-metallic material, and the first valve core 310 is located between the valve needle 200 and the opening of the valve cavity 110. The second valve core 320 is disposed in the valve cavity 110 and has a second through hole 321. The material of the second valve core 320 is a metallic material, and the second valve core 320 is adjacent to one side of the first valve core 310 facing the valve needle 200. Among them, the second through hole 321 and the first through hole 311 together form the valve port of the electric valve. Accordingly, in the fully closed state of the electric valve, the valve needle 200 passes through the second through hole 321 and contacts the hole wall of the first through hole 311 to form a seal. The present invention adopts the design of combining the first valve core 310 and the second valve core 320 to form the valve port. By selecting a non-metallic material for the first valve core 310, when the valve needle 200 contacts the first valve core 310, soft contact between the valve needle 200 and the first valve core 310 can be achieved, thereby ensuring a good sealing effect between the valve needle 200 and the valve port. By selecting a metallic material for the second valve core 320 and taking advantage of the characteristic that metallic materials are less affected by environmental factors such as temperature, the second valve core 320 can be easily processed into the required shape to meet the demand for flow regulation, further improving the regulation accuracy of the electric valve.

[0051] Specifically, as Figure 2 , Figure 3 and Figure 5 shown in the present embodiment, the inner diameter of the port of the valve port facing the valve needle 200 can be larger than the inner diameter of the port of the valve port facing away from the valve needle 200. On this basis, the inner wall of the valve port can be smoothly transitioned between the above two ports, and the smooth transition can prevent the flow rate from changing suddenly when opening and closing the valve.

[0052] Furthermore, as Figure 5 shown, based on the above design of the valve port, in the present embodiment, the inner wall of the second through hole 321 can be substantially inclined, that is, the cross-sectional shape of the flow regulation section of the valve port is substantially inclined linear. In some embodiments, the inner wall of the valve port can also have other smoothly transitioned structures, such as substantially arc-shaped, that is, the cross-sectional shape of the valve port is substantially curved, and it is not limited thereto.

[0053] In some embodiments, the inner wall of the second through hole 321 includes multiple inclined surfaces with different slopes or multiple arc surfaces with different curvatures to meet the requirements of different flow curves.

[0054] Furthermore, as Figure 5As shown, based on the above design of the valve port, in this embodiment, the inner diameter of the first through hole 311 facing the orifice of the valve needle 200 may be equal to the inner diameter of the second through hole 321 facing away from the orifice of the valve needle 200. In some embodiments, the inner diameter of the first through hole 311 facing the orifice of the valve needle 200 may also be slightly smaller than the inner diameter of the second through hole 321 facing away from the orifice of the valve needle 200, and this is not limited thereto.

[0055] Further, as Figure 5 shown, based on the above design of the valve port, in this embodiment, the inner diameter of the first through hole 311 facing the orifice of the valve needle 200 may be greater than the inner diameter of the orifice facing away from the valve needle 200. On this basis, the hole wall of the first through hole 311 may have a smooth transition between the above two orifices.

[0056] Further, as Figure 5 shown, based on the above design of the first through hole 311, in this embodiment, the inner wall of the first through hole 311 may be substantially inclined, that is, the cross-sectional shape of the first through hole 311 is substantially inclined linear. In some embodiments, the inner wall of the first through hole 311 may also have other smoothly transitioning structures, such as being substantially arc-shaped, that is, the cross-sectional shape of the first through hole 311 is substantially curved, and this is not limited thereto.

[0057] Further, as Figure 5 shown, based on the above design of the valve port, in this embodiment, the inner diameter of the second through hole 321 facing the orifice of the valve needle 200 may be greater than the inner diameter of the orifice facing away from the valve needle 200. On this basis, the hole wall of the second through hole 321 may have a smooth transition between the above two orifices.

[0058] Further, as Figure 5 shown, based on the above design of the second through hole 321, in this embodiment, the inner wall of the second through hole 321 may be substantially inclined, that is, the cross-sectional shape of the second through hole 321 is substantially inclined linear. In some embodiments, the inner wall of the second through hole 321 may also have other smoothly transitioning structures, such as being substantially arc-shaped, that is, the cross-sectional shape of the second through hole 321 is substantially curved, and this is not limited thereto.

[0059] Optionally, as Figure 1 、 Figure 4 and Figure 5 shown, in this embodiment, along the axial direction X of the valve seat 100, the thickness of the first valve core 310 may be greater than the thickness of the second valve core 320. In some embodiments, the thickness of the first valve core 310 may also be equal to or slightly smaller than the thickness of the second valve core 320, and it can be flexibly adjusted according to the sealing requirements and flow rate adjustment requirements, and this is not limited thereto.

[0060] Optionally, as Figure 5As shown, in the present embodiment, the first valve core 310 may be formed with a first annular groove 312, and the first annular groove 312 is formed on the periphery of the orifice on the side of the first through hole 311 facing away from the valve needle 200.

[0061] Optionally, as Figure 5 shown, in the present embodiment, the second valve core 320 may be formed with a second annular groove 322, and the second annular groove 322 is formed on the periphery of the orifice on the side of the second through hole 321 facing the valve needle 200.

[0062] Optionally, in the present embodiment, the material of the first valve core 310 may be PTFE. In some embodiments, the material of the first valve core 310 may also be other non-metallic materials, such as PPS, PEAK, or nylon, etc., and is not limited thereto.

[0063] Optionally, in the present embodiment, the material of the second valve core 320 may be stainless steel or aluminum.

[0064] Optionally, as Figures 1 to 4 shown, in the present embodiment, the electric valve proposed by the present invention may further include a valve core sleeve 400. Specifically, the valve core sleeve 400 is partially disposed in the valve cavity 110, and the valve core sleeve 400 is adjacent to the side of the first valve core 310 facing away from the valve needle 200. Among them, the valve core sleeve 400 is provided with a channel penetrating through both ends thereof along the axial direction X, and the channel communicates with the valve port formed by the above-mentioned first through hole 311 and the second through hole 321, and specifically communicates with the orifice on the side of the first through hole 311 facing away from the valve needle 200.

[0065] As Figure 2 shown, in the present embodiment, the valve seat 100 is provided with a flow hole 120.

[0066] As Figure 2 shown, in the present embodiment, the electric valve further includes a mounting base 510 and a sleeve 520. The mounting base 510 is provided with a mounting cavity, and the valve seat 100, the first valve core 310, the second valve core 320, and the valve core sleeve 400 are mounted in the mounting cavity and are detachably connected to the mounting cavity.

[0067] As Figure 2 shown, in the present embodiment, the driving mechanism includes a rotor assembly 610 and a nut assembly 620 disposed in the sleeve 520. The rotor assembly 610 is sleeved outside the nut assembly 620. One end of the screw 630 away from the valve needle 200 is fixedly connected to the rotor assembly 610. The rotor assembly 610 drives the valve needle 200 to move axially along the axial direction X to adjust the opening degree of the valve port. The nut assembly 620 is provided with an internal thread and is threadedly connected to the valve needle 200, and the nut assembly 620 is fixedly connected to the valve seat 100.

[0068] AsFigure 2 As shown, in this embodiment, the electric valve further includes a screw 630, a spring sleeve 640, a spring 650, and a rotating member 660 (such as a bearing). One end of the spring sleeve 640 is sleeved on the end of the valve needle 200. The spring 650 is installed inside the spring sleeve 640. The spring sleeve 640 has a balance hole 641. The screw 630 is arranged at the other end of the spring sleeve 640. The bearing is sleeved on the screw 630, and the bearing is located between the screw 630 and the spring sleeve 640. Since there is a bearing between the screw 630 and the spring sleeve 640, the first valve core 310 and the valve seat 100 are in soft seal. In this way, the friction force between the first valve core 310 and the screw 630 is less than the friction force between the valve core and the valve seat 100, avoiding the wear problem of the soft-sealed valve port.

[0069] As Figure 2 shown, in this embodiment, a balance channel 210 is provided inside the valve needle 200 to balance the pressures at both ends of the valve needle 200. The balance channel 210 includes a first section close to the spring sleeve 640 and a second section close to the valve port. The inner diameter of the second section is larger than that of the first section for closing the valve with large-flow circulation.

[0070] It should be noted here that the electric valves shown in the drawings and described in this specification are only a few examples of the many electric valves that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the electric valves shown in the drawings or described in this specification.

[0071] In summary, the electric valve proposed by the present invention forms a valve port by combining the first valve core and the second valve core. By selecting a non-metallic material for the first valve core, when the first valve core contacts the valve needle, soft contact between the valve needle and the first valve core can be achieved, thereby ensuring a good sealing effect between the valve needle and the valve port. On this basis, by selecting a metal material for the second valve core and taking advantage of the characteristics that the metal material is less affected by environmental factors such as temperature, the second valve core can meet the requirements of flow regulation and further improve the regulation accuracy of the electric valve.

[0072] Exemplary embodiments of the electric valve proposed by the present invention have been described and / or illustrated in detail above. However, the embodiments of the present invention are not limited to the specific embodiments described herein. On the contrary, the components and / or steps of each embodiment can be used independently and separately from the other components and / or steps described herein. Each component and / or each step of one embodiment can also be used in combination with the other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "a", "an" and "the above" etc. are used to indicate the existence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to mean an open inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc. In addition, the terms "first" and "second" etc. in the claims and the specification are only used as labels and are not numerical limitations on their objects.

[0073] Although the electric valve proposed by the present invention has been described according to different specific embodiments, those skilled in the art will recognize that changes can be made to the implementation of the present invention within the spirit and scope of the claims.

Claims

1. An electric valve, characterized in that, The electric valve includes: a valve seat having a valve cavity; a valve needle movably disposed in the valve cavity; a first valve core disposed in the valve cavity and having a first through hole, the material of which is a non-metallic material, so that when the first valve core contacts the valve needle, it is a soft contact, and the first valve core is located between the valve needle and the opening of the valve cavity; and a second valve core disposed in the valve cavity and having a second through hole, the material of which is a metallic material, the second valve core is adjacent to the side of the first valve core facing the valve needle, the second through hole and the first through hole together form a valve port, and the inner wall of the second through hole is in an inclined plane shape or an arc shape; wherein, in the fully closed state of the electric valve, the valve needle passes through the second through hole and contacts the hole wall of the first through hole to form a seal.

2. The electric valve according to claim 1, wherein The inner diameter of the port of the valve port facing the valve needle is larger than the inner diameter of the port facing away from the valve needle, and the inner wall of the valve port smoothly transitions between the two ports.

3. The electric valve according to claim 2, characterized in that, The inner diameter of the orifice of the first through hole facing the valve needle is less than or equal to the inner diameter of the orifice of the second through hole facing away from the valve needle.

4. The electric valve according to claim 2, characterized in that The inner diameter of the orifice of the first through hole facing the valve needle is larger than the inner diameter of the orifice facing away from the valve needle, and the hole wall of the first through hole smoothly transitions between the two orifices; and / or, the inner diameter of the orifice of the second through hole facing the valve needle is larger than the inner diameter of the orifice facing away from the valve needle, and the hole wall of the second through hole smoothly transitions between the two orifices.

5. The electric valve according to claim 2, wherein The inner wall of the second through hole includes multiple inclined planes with different slopes or multiple arc surfaces with different curvatures.

6. The electric valve according to claim 1, wherein The first valve core forms a first annular groove at the periphery of the orifice of the first through hole on the side facing away from the valve needle.

7. The electric valve according to claim 1, characterized in that, The second valve core forms a second annular groove at the periphery of the orifice of the second through hole on the side facing the valve needle.

8. The electric valve according to claim 1, characterized in that, The electric valve further includes: a valve core sleeve, partially disposed in the valve cavity and adjacent to the side of the first valve core facing away from the valve needle, the valve core sleeve is provided with a through channel, and the channel communicates with the valve port.

9. The electric valve according to claim 8, wherein, The electric valve further includes a mounting base body, the mounting base body is provided with a mounting cavity, and the valve seat, the first valve core, the second valve core and the valve core sleeve are mounted in the mounting cavity and are detachably connected to the mounting cavity.

10. The electric valve according to claim 1, characterized in that, The electric valve further includes a screw rod, a spring sleeve, a spring and a rotating member. One end of the spring sleeve is sleeved on the end of the valve needle, the spring is installed in the spring sleeve, and the spring sleeve has a balance hole; the screw rod is disposed at the other end of the spring sleeve; the rotating member is sleeved on the screw rod, and the rotating member is located between the screw rod and the spring sleeve.

11. The electric valve according to claim 10, characterized in that, The valve needle is driven by a driving mechanism; the driving mechanism includes a rotor assembly and a nut assembly disposed in a sleeve, the rotor assembly is sleeved outside the nut assembly, one end of the screw rod away from the valve needle is fixedly connected to the rotor assembly, and the rotor assembly drives the valve needle to axially move through the screw rod so as to adjust the opening degree of the valve port.

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