Motor-operated valve

Abstract

The present invention provides an electrically operated valve including a valve seat (10) and a spindle (20) mounted within the valve seat (10), a valve core (30) mounted on one end of the valve seat (10) to form a valve port, and a drive assembly for driving the spindle (20) to move it in the axial direction to open and close the valve port, wherein the valve core (30) is made of a non-metallic material, the inner wall or end face of the valve core (30) forms a sealing surface, and the sealing surface and the outer wall surface of the spindle (20) form a soft seal structure. The soft seal structure consisting of the valve core (30) and the spindle (20) can solve the technical problem of low sealing performance of the electrically operated valve.

Description

[Technical field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on March 17, 2021, bearing application number 202110287924.4 and titled "Motor-operated valve", and claims priority to a patent application filed with the State Intellectual Property Office of China on March 17, 2021, bearing application number 202120553724.4 and titled "Motor-operated valve".

[0002] TECHNICAL FIELD This application relates to the technical field of motorized valves, and more particularly, to motorized valves. [Background technology]

[0003] At present, a motor-operated valve in the prior art includes a valve seat, a valve core and a spindle, the spindle is disposed in the valve seat, and at least a portion of the valve core is inserted into the valve seat, and both the spindle and the valve core are made of metal materials.

[0004] However, in practical use, leakage is likely to occur between the valve core and the spindle, leading to the technical problem of poor sealing performance of the motor-operated valve. Summary of the Invention

[0005] The main objective of the present application is to provide a motorized valve for solving the technical problem of poor sealing performance of the motorized valve in the prior art.

[0006] To achieve the above objective, the motor-operated valve provided in the present application includes a valve seat and a spindle attached to one end of the valve seat, with the valve core forming a valve port, a drive assembly for driving the spindle to move in the axial direction to open and close the valve port, and a valve core attached in the valve seat and fitted to the spindle, wherein the valve core is made of a non-metallic material, an inner wall or end face of the valve core forms a sealing surface, and the sealing surface and an outer wall surface of the spindle form a soft sealing structure.

[0007] Additionally, the valve core is manufactured from a polytetrafluoroethylene material.

[0008] Furthermore, the valve seat has a first mounting port and a second mounting port arranged opposite each other along the axial direction, and a communicating passage passing radially through the valve seat, the first mounting port is located above the second mounting port, the communicating passage is provided on a side wall of the valve seat and located between the first and second mounting ports, the cross-sectional area of ​​the second mounting port is larger than the cross-sectional area of ​​the first mounting port, and the outer shape of the second mounting port and the outer shape of the valve core are aligned with each other so that the valve core can be attached to the second mounting port.

[0009] Additionally, the valve seat is an annular structure.

[0010] Furthermore, the sealing surface is a tapered surface, the valve core has a first end and a second end opposite each other, the first end is located above the second end, and the flow path area of ​​the sealing surface gradually decreases along the extension direction from the first end to the second end.

[0011] Additionally, an equalization passage is provided in the spindle to equalize pressure across the spindle, and a first seal member is provided between the spindle and the valve seat.

[0012] Furthermore, the motor-operated valve further includes a spring sleeve having one end fitted to the end of the spindle, a spring mounted within the spring sleeve, a screw provided at the other end of the spring sleeve, and a bearing fitted to the screw and positioned between the screw and the spring sleeve.

[0013] Additionally, the motorized valve further includes a core sleeve at least partially mounted within the second mounting port and located at an end of the core remote from the spindle.

[0014] Furthermore, the valve core sleeve includes a main body portion at least partially inserted into the second mounting port and having an end abutted against an end of the valve core, and a positioning portion protruding from the outer wall of the main body portion and abutting against an end of the valve seat for positioning.

[0015] Furthermore, the positioning portion and the end of the valve seat are connected by welding.

[0016] Furthermore, the motor-operated valve further includes a mounting base having a mounting passage, and the valve seat, the valve core and the valve core sleeve are all mounted within the mounting passage, wherein a second sealing member is provided between the mounting base and the valve seat, and / or a third sealing member is provided between the mounting base and the valve core sleeve.

[0017] Furthermore, the mounting base is a valve body or a mounting base.

[0018] When the technical aspect of the present application is applied, a soft seal structure is formed between the seal surface and the outer wall surface of the spindle, and this soft seal structure can avoid the occurrence of leakage between the valve core and the valve seat, and improve the sealing performance of the motor-operated valve. Specifically, the valve core in this embodiment is mainly made of plastic material, and after the valve core made of non-metallic material and the spindle made of metallic material are installed, the non-metallic material is a soft material compared to the metallic material, so that the sealing performance can be easily improved after the hard material and the soft material are installed together. In addition, since the valve core is made of non-metallic material, a soft seal structure can also be formed between the valve core and the valve seat, which makes it easier to better improve the sealing performance of the motor-operated valve. Therefore, the technical aspect of the present application can solve the technical problem of the poor sealing performance of the motor-operated valve in the prior art. [Brief description of the drawings]

[0019] The drawings in the specification which form a part of this application are intended to provide a further understanding of the application, and the schematic examples and their explanations are intended to interpret the application and are not intended to unduly limit the application.

[0020] [Figure 1] 1 shows a structural schematic diagram of a partial structure of an electrically operated valve provided by an embodiment of the present application. [Diagram 2] 2 shows an exploded view of the partial structure in FIG. 1. [Diagram 3]FIG. 2 shows a structural schematic diagram of the mounting of the screw, bearing and spring sleeve provided by an embodiment of the present application. [Figure 4] FIG. 2 shows a structural schematic diagram of a bearing provided according to an embodiment of the present application fitted onto a screw. [Diagram 5] FIG. 2 is a schematic diagram showing the structure in FIG. 1 mounted on a mounting base.

[0021] Here, the above drawings include the following reference numbers: 10 valve seat, 20 spindle, 30 valve core, 31 seal surface, 41 first seal member, 42 second seal member, 43 third seal member, 50 spring sleeve, 60 spring, 70 screw, 80 bearing, 90 valve core sleeve, 91 main body portion, 92 positioning portion, 100 mounting base. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] It should be noted that, unless there is a contradiction, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0023] As shown in Figures 1 to 5, the motor-operated valve provided in the embodiments of the present application includes a valve seat 10, a spindle 20 mounted in the valve seat 10, a valve core 30, and a driving assembly. The valve core 30 is mounted in the valve seat 10 and attached to one end of the valve seat 10. The valve core 30 is fitted into the spindle 20 to form a valve port, specifically, the valve port is formed by the hollow structure of the valve core 30. The driving assembly drives the spindle 20 to move in the axial direction to open and close the valve port. Here, the valve core 30 is made of a non-metallic material, and a sealing surface 31 is formed by the inner wall or end surface of the valve core 30 (the end surface may be the upper end surface, the lower end surface, or the upper end surface and the lower end surface), and a soft sealing structure is formed by the sealing surface 31 and the outer wall surface of the spindle 20.

[0024] By adopting such a configuration, a soft seal structure is formed between the seal surface 31 and the outer wall surface of the spindle 20, which prevents leakage between the valve core 30 and the valve seat 10, and improves the sealing performance of the motor-operated valve. Specifically, the valve core 30 in this embodiment is mainly made of plastic material, and after the valve core 30 made of non-metallic material and the spindle 20 made of metallic material are installed, the sealing performance can be easily improved after the hard material and the soft material are installed together, because the non-metallic material is a soft material compared to the metallic material. In addition, since the valve core 30 is made of non-metallic material, a soft seal structure is also formed between the valve core 30 and the valve seat 10, which makes it easy to further improve the sealing performance of the motor-operated valve. Therefore, the technical aspect of this embodiment can solve the technical problem of the low sealing performance of the motor-operated valve in the prior art.

[0025] Specifically, the valve core 30 in this embodiment is made of polytetrafluoroethylene, which facilitates better improving the sealing performance of the motor-operated valve.

[0026] In this embodiment, the valve seat 10 has a first mounting hole and a second mounting hole provided opposite to each other along the axial direction, and the valve seat 10 is further provided with a communication passage penetrating the valve seat 10 in the radial direction, the first mounting hole is located above the second mounting hole, the communication passage is provided on the side wall of the valve seat 10 and located between the first mounting hole and the mounting hole, the cross-sectional area of ​​the second mounting hole is larger than that of the first mounting hole, and the outer shape of the second mounting hole and the outer shape of the valve core 30 are matched with each other so that the valve core 30 can be mounted in the second mounting hole. By adopting such a configuration, the valve core 30 can be directly mounted from the second mounting hole during mounting, making the mounting operation easier. Since the valve core 30 can be mounted from the second mounting hole, the valve core can be made large in diameter, and a large flow rate can be achieved.

[0027] Specifically, the valve seat 10 has an annular structure, and in this embodiment, the valve seat 10 has a circular ring structure.

[0028] Specifically, the sealing surface 31 in this embodiment is a tapered surface, the valve core 30 has a first end and a second end opposite to each other, the first end is located above the second end, and the flow area of ​​the sealing surface 31 gradually decreases along the extending direction from the first end to the second end. By adopting such a configuration, the sealing performance between the valve core 30 and the spindle 20 can be easily improved and the leakage between the valve core 30 and the spindle 20 can be reduced.

[0029] In this embodiment, an equalizing passage is provided in the spindle 20 to equalize the pressure at both ends of the spindle 20, and a first seal member 41 is provided between the spindle 20 and the valve seat 10 to facilitate better improving the sealing performance, and to realize the equalization of the pressure at the upper and lower ends of the spindle in the closed valve state.

[0030] Specifically, the motor-operated valve in this embodiment further includes a spring sleeve 50, a spring 60, a screw 70 and a bearing 80. One end of the spring sleeve 50 is fitted to the end of the spindle 20, and the spring 60 is mounted in the spring sleeve 50. The screw 70 is provided at the other end of the spring sleeve 50, and the bearing 80 is fitted to the screw 70, and the bearing 80 is located between the screw 70 and the spring sleeve 50. By adopting this configuration, the bearing 80 is provided between the screw 70 and the spring sleeve 50, so that the friction force between the valve core 30 and the valve seat 10 becomes a soft seal, and the friction force between the valve core 30 and the screw 70 is smaller than the friction force between the valve core 30 and the valve seat 10, and the wear problem of the soft seal valve port is avoided.

[0031] In this embodiment, the drive assembly of the motor-operated valve includes a rotor assembly and a nut assembly, the rotor assembly is fitted onto the outside of the nut assembly, one end of the screw 70 remote from the spindle 20 is fixedly connected to the rotor assembly, and the rotor assembly moves the spindle 20 in the axial direction in conjunction with the screw to adjust the opening of the valve port. The nut assembly has a female thread that is screwed onto the spindle 20, and the nut assembly is fixedly connected to the valve seat 10 by a connecting member.

[0032] In this embodiment, the motor-operated valve further includes a valve core sleeve 90, at least a portion of which is mounted in the second mounting port and located at one end of the valve core 30 away from the spindle 20. This configuration changes the traditional integral structure of the valve seat 10 to a separate structure, which facilitates the installation operation. At the same time, the structure of the valve core sleeve 90 facilitates the positioning of the valve core 30, improves the positioning stability of the valve core 30, and improves the performance of the entire structure. The valve core sleeve 90 may be fitted to the outside of the second mounting port, and only the valve core sleeve 90 and the spindle 20 are required.

[0033] Specifically, the valve core sleeve 90 in this embodiment includes a main body 91 and a positioning portion 92, and at least a portion of the main body 91 is inserted into the second mounting hole, and an end of the main body 91 abuts against an end of the valve core 30. The positioning portion 92 protrudes from the outer wall of the main body 91 and is used for positioning by abutting against an end of the valve seat 10. By adopting such a configuration, the positioning operation of the valve core 30 can be made easier, and the placement stability of the valve core 30 can be improved.

[0034] Preferably, for ease of production and manufacturing, the body portion 91 and the positioning portion 92 in this embodiment are of an integrally molded structure.

[0035] In this embodiment, the positioning portion 92 and the end of the valve seat 10 are connected by welding, which further improves the positioning stability of the valve core 30 and also improves the placement stability of the valve core sleeve 90 .

[0036] Specifically, the motor-operated valve in this embodiment further includes a mounting base 100 having an installation passage, and the valve seat 10, the valve core 30 and the valve core sleeve 90 are all installed in the installation passage. Here, a second seal member 42 may be provided between the mounting base 100 and the valve seat 10. Alternatively, a third seal member 43 may be provided between the mounting base 100 and the valve core sleeve 90. Alternatively, the second seal member 42 may be provided between the mounting base 100 and the valve seat 10, and the third seal member 43 may be provided between the mounting base 100 and the valve core sleeve 90.

[0037] Preferably, in this embodiment, a second seal 42 is provided between the mounting base 100 and the valve seat 10, and a third seal 43 is provided between the mounting base 100 and the valve core sleeve 90. By adopting such a configuration, the sealing performance of the motor-operated valve can be better improved.

[0038] In this embodiment, the mounting base 100 is a valve body or a mounting base, and the specific mounting can be determined according to the actual use.

[0039] The valve core 30 in this embodiment is a soft seal material to solve the leakage problem. In order to achieve large flow rate and internal balance (easy to open the valve), the valve assembly is a flip structure, that is, the valve core 30 is assembled from the bottom up, and the valve seat structure is a separate structure (the valve seat structure includes a valve seat and a valve core sleeve, and the valve seat and the valve core sleeve are two parts to form a separate structure), and the valve seat 10, the valve core 30 and the valve core sleeve 90 are provided to solve the leakage problem of the valve port. The valve core 30 in this embodiment is a large diameter structure, and there is basically no relative movement between the valve core 30 and the spindle 20, which reduces the friction between the valve core 30 and the spindle 20 and prevents the wear of the valve core 30, which is a soft seal material.

[0040] As can be seen from the above description, the above embodiments of the present application achieve the technical effects of reducing leakage and improving the sealing effect of the motor-operated valve.

[0041] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprise" and / or "comprise" are used herein, it means that features, steps, operations, devices, assemblies, and / or combinations thereof are present.

[0042] Unless otherwise specifically described, the relative arrangement of the components and steps, the formulas and values ​​described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for convenience of description, the dimensions of each part shown in the drawings are not drawn in actual proportion. Although detailed descriptions of techniques, methods and equipment known to those skilled in the art may be omitted, the techniques, methods and equipment should be considered as part of the approved specification, as necessary. In all examples proposed and described herein, any specific values ​​should be interpreted as being merely illustrative and not limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar symbols and letters represent similar things in the following drawings, so that once something is defined in one drawing, there is no need to further describe it in the subsequent drawings.

[0043] In describing the present application, it should be understood that orientations or positional relationships indicated by directional terms such as "front, back, top, bottom, left, right", "lateral, longitudinal, vertical, horizontal", "top, bottom", etc. are based on the orientations or positional relationships shown in the drawings, and are merely for facilitating and simplifying the description of the present application, and unless otherwise stated, these directional terms do not indicate or imply that the devices or elements shown necessarily have a specific orientation or are configured and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application, and the directional terms "inside, outside" are inside and outside with respect to the contour of each member itself.

[0044] For ease of description, spatially relative terms such as "above," "above," "on top of," "above," and the like may be used herein to describe the spatial location of one device or feature relative to another device or feature as depicted in the drawings. It should be understood that the spatially relative terms are intended to encompass different orientations during use or operation other than the orientation depicted in the drawings of the device. For example, if a device in the drawings is turned upside down, a device described as "above other devices or structures" or "on top of other devices or structures" would then be positioned "below other devices or structures" or "below other devices or structures." Thus, the exemplary term "above" can include two orientations: "above" and "below." The device can also be positioned in other different ways (rotated 90 degrees or in other orientations) and a corresponding interpretation made of the spatially relative descriptions used herein.

[0045] It should be further explained that the use of terms such as "first", "second", etc. to define parts is merely for the purpose of easily distinguishing corresponding parts, and unless otherwise specified, the above terms have no special meaning and should not be understood as limiting the scope of protection of the present application.

[0046] The above description is merely a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art may make various modifications and changes to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be encompassed within the protection scope of the present application.

Claims

1. a valve seat (10) and a spindle (20) mounted within the valve seat (10); a valve core (30) attached to one end of the valve seat (10) to form a valve port; a drive assembly for driving the spindle (20) to move it axially to open and close the valve port, The valve core (30) is made of a non-metallic material, the inner wall or end face of the valve core (30) forms a sealing surface (31), and the sealing surface (31) and the outer wall surface of the spindle (20) form a soft sealing structure. the valve seat (10) has a first mounting port and a second mounting port provided opposite each other along the axial direction, and a communicating passage passing radially through the valve seat (10), the first mounting port is located above the second mounting port, the communicating passage is provided on a side wall of the valve seat and located between the first mounting port and the second mounting port, a cross-sectional area of ​​the second mounting port is larger than a cross-sectional area of ​​the first mounting port, and an outer shape of the second mounting port and an outer shape of the valve core (30) are aligned with each other so that the valve core (30) can be attached to the second mounting port.

2. A valve seat (10) and a spindle (20) mounted within the valve seat (10); a valve core (30) attached to one end of the valve seat (10) to form a valve port; a drive assembly for driving the spindle (20) to move it axially to open and close the valve port, The valve core (30) is made of a non-metallic material, the inner wall or end surface of the valve core (30) forms a sealing surface (31), and the sealing surface (31) and the outer wall surface of the spindle (20) form a soft sealing structure; The sealing surface (31) is a tapered surface, the valve core (30) has a first end and a second end arranged opposite each other, the first end is located above the second end, and a flow path area of ​​the sealing surface (31) gradually decreases along an extension direction from the first end to the second end.

3. A valve seat (10) and a spindle (20) mounted within the valve seat (10); a valve core (30) attached to one end of the valve seat (10) to form a valve port; a drive assembly for driving the spindle (20) to move it axially to open and close the valve port, The valve core (30) is made of a non-metallic material, the inner wall or end surface of the valve core (30) forms a sealing surface (31), and the sealing surface (31) and the outer wall surface of the spindle (20) form a soft sealing structure; The motor-operated valve further comprises a first seal member (41) disposed between the spindle (20) and the valve seat (10), the first seal member (41) being disposed between the spindle (20) and the valve seat (10) and providing an equalizing passage within the spindle (20) to equalize pressures at both ends of the spindle (20).

4. A valve seat (10) and a spindle (20) mounted within the valve seat (10); a valve core (30) attached to one end of the valve seat (10) to form a valve port; a drive assembly for driving the spindle (20) to move it axially to open and close the valve port, The valve core (30) is made of a non-metallic material, the inner wall or end surface of the valve core (30) forms a sealing surface (31), and the sealing surface (31) and the outer wall surface of the spindle (20) form a soft sealing structure; A spring sleeve (50) having one end fitted to an end of the spindle (20), and a spring (60) mounted within the spring sleeve (50); A screw (70) provided at the other end of the spring sleeve (50); The motor-operated valve further includes a bearing (80) fitted to the screw (70) and positioned between the screw (70) and the spring sleeve (50).

5. 2. The motor-operated valve of claim 1, further comprising a core sleeve (90) at least partially mounted within the second mounting port and located at an end of the core (30) remote from the spindle (20).

6. The valve core sleeve (90) is a main body portion (91) at least a portion of which is inserted into the second mounting port and an end portion of which is abutted against an end portion of the valve core (30); The motor-operated valve according to claim 5, further comprising a positioning portion (92) that protrudes from an outer wall of the main body portion (91) and abuts against an end of the valve seat (10) to perform positioning.

7. The motor-operated valve according to claim 6, wherein the positioning portion (92) and the end of the valve seat (10) are connected by welding.

8. The electrically operated valve further includes a mounting base (100) having a mounting passage, and the valve seat (10), the valve core (30) and the valve core sleeve (90) are all mounted within the mounting passage, a second seal member (42) is provided between the mounting base (100) and the valve seat (10); and / or The motor-operated valve according to claim 5, further comprising a third seal member (43) provided between the mounting base (100) and the valve core sleeve (90).

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