Motorized valve

Abstract

The utility model provides a kind of electric valve, including valve body, valve seat, valve block, with the valve rod of valve block transmission connection and the electric drive component for driving the rotation of valve rod, dynamic sealing assembly is equipped between the shaft through-hole of valve rod and valve body, dynamic sealing assembly includes sealing cover, sealing cover can form oil storage cavity between the port of valve body side with valve body, the lubricating oil in oil storage cavity can be guided to the radial outer peripheral wall of valve rod, oil injection hole is formed in valve body and is communicated with oil storage cavity, oil injection hole can be selectively communicated or blocked.The utility model can inject lubricating oil into oil storage cavity via oil injection hole after the internal components of valve cavity, such as valve body, valve seat and valve block, are assembled, and when the amount of lubricating oil in oil storage cavity reduces, additional lubricating oil is added into oil storage cavity via the oil injection hole, which can ensure sufficient lubrication of the radial outer periphery of valve rod, reduce the frictional resistance of valve rod, and further ensure the reliability of the electric drive component driving the rotation of valve block.

Description

Technical Field

[0001] This utility model relates to the field of pipeline valve design technology, specifically to an electric valve. Background Technology

[0002] Patent document CN223120709U discloses an electric valve. This electric valve has a dynamic sealing assembly on the radial outer periphery of its valve stem. A chamber for accommodating lubricating oil is formed between the piston (also called a sealing cap) of the dynamic sealing assembly and the valve body. An oil inlet hole is formed on the piston, connecting the aforementioned chamber to the radial outer peripheral wall of the valve stem. Simultaneously, under the sealing action of multiple sealing rings spaced axially along the valve stem in the dynamic sealing assembly, the lubricating oil in the aforementioned chamber can be reliably confined to the radial outer peripheral region of the valve stem, maintaining lubrication of the dynamic sealing assembly, reducing the low friction between it and the valve stem, and ensuring the reliability of the drive component in rotating the valve block. However, in practical applications, the inventors found that, due to the fixed capacity of the aforementioned chamber, lubricating oil leakage from the dynamic sealing assembly is unavoidable. Thus, after prolonged use of the electric valve, insufficient lubricating oil appears at the dynamic sealing assembly, significantly reducing its lubrication effect. Utility Model Content

[0003] The electric valve designed in this invention can at least partially solve the above problems.

[0004] The purpose of this utility model is to provide an electric valve, including a valve body, a valve seat, a valve block, a valve stem pulsator connected to the valve block, and an electric drive component for driving the valve stem to rotate. A dynamic sealing assembly is provided between the valve stem and the through hole of the valve body. The dynamic sealing assembly includes a sealing cover. The sealing cover can form an oil storage cavity with the port of the valve body on the side closer to the valve seat. The lubricating oil in the oil storage cavity can be guided to the radial outer peripheral wall of the valve stem. An oil injection hole communicating with the oil storage cavity is formed on the valve body. The oil injection hole can be selectively connected or blocked.

[0005] In some embodiments, an oil reservoir groove is formed on the end face of the sealing cap near the valve body.

[0006] In some embodiments, the depth of the oil injection hole extends parallel to the length of the valve stem and penetrates both the inner and outer sides of the valve body.

[0007] In some embodiments, the oil injection hole is an internally threaded hole, and a first screw is internally threaded into the internally threaded hole. The electric valve also includes a bracket, which is assembled between the housing of the electric drive component and the valve body, and provides axial restraint for the first screw.

[0008] In some embodiments, the electric valve further includes a bracket assembled between the housing of the electric drive component and the valve body. The bracket has multiple connecting through holes, and the valve body has multiple threaded connecting holes. Each connecting through hole and each threaded connecting hole are coaxially arranged in a one-to-one correspondence. A second screw passes through each connecting through hole, and each second screw is threadedly connected to each threaded connecting hole to achieve a detachable connection between the bracket and the valve body. The depth extension direction of the oil injection hole is parallel to the length extension direction of the valve stem, and one end of the oil injection hole is connected to one of the multiple threaded connecting holes, and the other end is connected to the oil storage chamber.

[0009] In some embodiments, a sealing plug is embedded in the bottom section of the threaded connection hole.

[0010] In some embodiments, a labyrinthine sealing structure is formed on the top surface of the bracket that mates with the housing of the electrically driven component.

[0011] In some embodiments, the labyrinthine sealing structure is embedded with dustproof cotton.

[0012] In some embodiments, the dynamic sealing assembly further includes a sealing ring seat, a first sealing ring, and a second sealing ring, wherein the first sealing ring, the sealing ring seat, and the second sealing ring are fitted onto the radial outer side wall of the valve stem and arranged sequentially along the axial direction of the valve stem, wherein the first sealing ring is used to seal the annular gap between the valve body port near the electrically driven component and the valve stem, the second sealing ring is used to seal the annular gap between the valve stem and the sealing cover; and / or, a third sealing ring is further provided between the sealing cover and the valve body.

[0013] In some embodiments, the first and second sealing rings are both star-shaped sealing rings; and / or, the third sealing ring is an O-ring; and / or, the sealing ring seat has an oil guide hole extending radially through its inner and outer annular walls.

[0014] The electric valve of this invention has an oil injection hole on the valve body that communicates with the oil storage chamber. This allows lubricating oil to be injected into the oil storage chamber through the oil injection hole after the valve body, valve seat, valve block, and other internal components of the valve chamber are assembled. When the amount of lubricating oil in the oil storage chamber decreases, supplementary lubricating oil can be added to the oil storage chamber through the oil injection hole. This ensures sufficient lubrication of the radial outer circumference of the valve stem, reduces the frictional resistance of the valve stem, and thus ensures the reliability of the electric drive component in rotating the valve block. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of an electric valve according to an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 A schematic diagram of the internal structure of the electric valve in the diagram;

[0017] Figure 3 This is a three-dimensional structural schematic diagram (partial exploded view) of an electric valve according to another embodiment of the present invention;

[0018] Figure 4 yes Figure 3 A schematic diagram of the internal structure of the electric valve in the diagram.

[0019] In the picture:

[0020] 1. Valve body; 11. Oil injection hole; 111. First screw; 12. Threaded connection hole; 121. Second screw; 122. Sealing plug; 2. Valve seat; 3. Valve block; 4. Valve stem; 5. Electric drive component; 6. Dynamic sealing assembly; 60. Oil reservoir; 61. Sealing cover; 611. Oil reservoir ring groove; 62. Sealing ring seat; 621. Oil guide hole; 63. First sealing ring; 64. Second sealing ring; 7. Bracket; 71. Connecting through hole; 72. Labyrinth seal structure; 73. Dustproof cotton; 8. Third sealing ring; 91. Rotating support shaft; 92. Axial elastic support component. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, for clarity, the thickness of regions and layers is exaggerated. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0022] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0023] The following example describes an electric valve of this utility model. This example is only a part of the embodiments of this utility model, but the protection scope of this utility model is not limited thereto. All other embodiments obtained by those skilled in the art without inventive effort should be covered within the protection scope of this utility model.

[0024] Please refer to the reference. Figures 1 to 4 As shown, according to an embodiment of this utility model, an electric valve is provided, including a valve body 1, a valve seat 2, a valve block 3, a valve stem 4 pultrusively connected to the valve block 3, and an electric drive component 5 for driving the valve stem 4 to rotate. It is understood that the valve body 1 and the valve seat 2 are engaged to form the valve cavity (not labeled in the figure) of the electric valve, and the valve block 3 is located within the valve cavity. The valve seat 2 has multiple refrigerant inlets and outlets (not labeled in the figure), and the valve block 3 has corresponding connecting channels. Thus, the valve block 3 can rotate by a preset angle around the central axis of the valve stem 4 under the driving action of the electric drive component 5, thereby realizing the rotation of the valve seat 2. The selective connection of the two refrigerant inlets and outlets at the target location enables control over the refrigerant flow and direction switching. A dynamic sealing assembly 6 is provided between the valve stem 4 and the rotating shaft through hole (not indicated in the figure) of the valve body 1. The dynamic sealing assembly 6 includes a sealing cover 61, which forms an oil storage chamber 60 with the port of the valve body 1 on the side facing the valve seat 2. The lubricating oil in the oil storage chamber 60 can be guided to the radial outer peripheral wall of the valve stem 4 to lubricate the valve stem 4 during rotation. An oil injection hole 11 is formed on the valve body 1 that communicates with the oil storage chamber 60. The oil injection hole 11 can be selectively connected or blocked.

[0025] In this technical solution, an oil injection hole 11 communicating with the oil storage chamber 60 is constructed on the valve body 1. This allows lubricating oil to be injected into the oil storage chamber 60 through the oil injection hole 11 after the valve body 1, valve seat 2, and valve block 3 and other internal valve components are assembled. When the amount of lubricating oil in the oil storage chamber 60 decreases, supplementary lubricating oil is added to the oil storage chamber 60 through the oil injection hole 11. This ensures sufficient lubrication of the radial outer circumference of the valve stem 4, reduces the frictional resistance of the valve stem 4, and thus ensures the reliability of the electric drive component 5 driving the valve block 3 to rotate.

[0026] See details Figure 2 As shown, the bottom surface of the valve block 3 is reliably rotatably supported on the top surface of the valve seat 2 via the rotating support shaft 91. An axial elastic support member 92, such as a helical spring, is held between the bottom end face of the sealing cover 61 and the top surface of the valve block 3, which can ensure that the sealing cover 61 can reliably seal the side port of the rotating shaft through hole of the valve body 1 near the valve seat 2.

[0027] In some embodiments, an oil storage ring groove 611 is formed on the end face of the sealing cap 61 near the valve body 1. The oil storage ring groove 611 is specifically arranged around the circumference of the valve stem 4. Objectively, the oil storage ring groove 611 is connected to the oil storage chamber 60, which can increase the oil storage capacity and thus extend the oil injection cycle.

[0028] exist Figure 1 and Figure 2 In the embodiment shown, the depth extension direction of the oil injection hole 11 is parallel to the length extension direction of the valve stem 4, and it penetrates the inner and outer sides of the valve body 1. Specifically, the oil injection hole 11 is an internally threaded hole, and a first screw 111 is internally threaded into the internally threaded hole. The electric valve also includes a bracket 7, which is assembled between the housing of the electric drive component 5 and the valve body 1, and forms an axial limit on the first screw 111.

[0029] In this technical solution, the oil injection hole 11 extends through both the inner and outer sides of the valve body 1. Simultaneously, because a bracket 7 is installed on the outer side of the valve body 1, the axial displacement of the first screw 111 can be limited by the bracket 7, thus achieving the aforementioned axial limiting and ensuring a reliable seal of the oil reservoir 60, preventing the first screw 111 from loosening and causing lubricating oil leakage. It is understood that because the first screw 111 is axially limited by the bracket 7, the bracket 7 needs to be removed from the valve body 1 when adding lubricating oil to the aforementioned oil reservoir 60.

[0030] In another specific embodiment, see Figure 3 and Figure 4 As shown, the electric valve also includes a bracket 7, which is assembled between the housing of the electric drive component 5 and the valve body 1. The bracket 7 has a plurality of connecting through holes 71 (which are smooth holes, i.e., without internal threads), and the valve body 1 has a plurality of threaded connecting holes 12. Each connecting through hole 71 and each threaded connecting hole 12 are coaxially arranged in a one-to-one correspondence. Each connecting through hole 71 is fitted with a second screw 121, and each second screw 121 is threadedly connected to each threaded connecting hole 12 to achieve a detachable connection (i.e., threaded connection) between the bracket 7 and the valve body 1. The depth extension direction of the oil injection hole 11 is parallel to the length extension direction of the valve stem 4, and one end of the oil injection hole 11 is connected to one of the plurality of threaded connecting holes 12, and the other end is connected to the oil storage chamber 60.

[0031] In this technical solution, the second screw 121 passes through the connecting through hole 71 on the bracket 7 and is threaded into the threaded connecting hole 12 on the valve body 1, thus realizing a reliable connection between the bracket 7 and the valve body 1. At the same time, one of the multiple threaded connecting holes 12 is connected to the oil storage chamber 60 through the aforementioned oil injection hole 11. This achieves the purpose of injecting oil into the oil storage chamber 60 from outside the bracket 7 without removing the bracket 7, making the addition of lubricating oil more convenient and efficient.

[0032] In some embodiments, a sealing plug 122 is embedded in the bottom section of the threaded connection hole 12. The sealing plug 122 can be a plastic or rubber sealing plug, which can effectively prevent the lubricating oil leakage that may occur after the second screw 121 is loosened due to the lack of axial restraint of the bracket 7.

[0033] In some embodiments, a labyrinthine sealing structure 72 is formed on the top surface of the bracket 7 that mates with the housing of the electric drive component 5. This improves the sealing effect between the bracket 7 and the electric drive component 5, preventing external dust, rain, snow, etc., from entering the valve body 1 through their mating surfaces. In a specific embodiment, the aforementioned labyrinthine sealing structure 72 is an UN sealing groove formed on the top surface of the bracket 7, which surrounds the output shaft of the electric drive component 5.

[0034] In some embodiments, the labyrinth seal structure 72 is embedded with a dustproof cotton 73, which can prevent dust from the outside of the electric valve from entering the valve body, but allows refrigerant leaking from the valve body to escape outward through the labyrinth seal structure 72, preventing high pressure from forming inside the valve body and causing high pressure deformation of plastic components.

[0035] In some embodiments, the dynamic sealing assembly 6 further includes a sealing ring seat 62, a first sealing ring 63, and a second sealing ring 64. The first sealing ring 63, the sealing ring seat 62, and the second sealing ring 64 are fitted onto the radial outer side wall of the valve stem 4 and are arranged sequentially along the axial direction of the valve stem 4. The first sealing ring 63 is used to seal the annular gap between the side port of the valve body 1 near the electric drive component 5 and the valve stem 4, and the second sealing ring 64 is used to seal the annular gap between the valve stem 4 and the sealing cover 61.

[0036] In this technical solution, a sealing ring seat 62 is provided between the first sealing ring 63 and the second sealing ring 64, which can reliably limit the position of the two sealing rings in the axial direction of the valve stem 4 and facilitate the assembly of the sealing rings.

[0037] In some embodiments, a third sealing ring 8 is provided between the sealing cover 61 and the valve body 1 to prevent refrigerant leakage through the annular gap between the sealing cover 61 and the valve body 1.

[0038] In one specific embodiment, the first sealing ring 63 and the second sealing ring 64 are both star-shaped sealing rings; the third sealing ring 8 is an O-ring.

[0039] In some embodiments, the sealing ring seat 62 has an oil guide hole 621 extending radially through its inner and outer annular walls, thereby connecting the aforementioned oil storage cavity 60 with the valve stem 4 between the first sealing ring 63 and the second sealing ring 64 via the oil guide hole 621 to enhance lubrication.

[0040] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0041] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electric valve, comprising a valve body (1), a valve seat (2), a valve block (3), a valve stem (4) pulverically connected to the valve block (3), and an electric drive component (5) for driving the valve stem (4) to rotate, wherein a dynamic sealing assembly (6) is provided between the valve stem (4) and the through hole of the valve body (1), characterized in that, The dynamic sealing assembly (6) includes a sealing cap (61), which can form an oil reservoir (60) between the sealing cap (61) and the port of the valve body (1) on the side of the valve seat (2). The lubricating oil in the oil reservoir (60) can be guided to the radial outer peripheral wall of the valve stem (4). An oil injection hole (11) communicating with the oil reservoir (60) is formed on the valve body (1). The oil injection hole (11) can be selectively connected or blocked.

2. The electric valve according to claim 1, characterized in that, An oil storage ring groove (611) is formed on the end face of the sealing cap (61) near the valve body (1).

3. The electric valve according to claim 1, characterized in that, The depth of the oil injection hole (11) extends parallel to the length of the valve stem (4) and extends through both the inner and outer sides of the valve body (1).

4. The electric valve according to claim 3, characterized in that, The oil injection hole (11) is an internally threaded hole, and a first screw (111) is internally threaded into the internally threaded hole. The electric valve also includes a bracket (7), which is assembled between the housing of the electric drive component (5) and the valve body (1), and forms an axial limit on the first screw (111).

5. The electric valve according to claim 1, characterized in that, The electric valve also includes a bracket (7), which is assembled between the housing of the electric drive component (5) and the valve body (1). The bracket (7) has multiple connecting through holes (71), and the valve body (1) has multiple threaded connecting holes (12). Each connecting through hole (71) and each threaded connecting hole (12) are coaxially arranged in a one-to-one correspondence. Each connecting through hole (71) is fitted with a second screw (121), and each second screw (121) is threadedly connected to each threaded connecting hole (12) to achieve a detachable connection between the bracket (7) and the valve body (1). The depth extension direction of the oil injection hole (11) is parallel to the length extension direction of the valve stem (4), and one end of the oil injection hole (11) is connected to one of the multiple threaded connecting holes (12), and the other end is connected to the oil storage chamber (60).

6. The electric valve according to claim 5, characterized in that, A sealing plug (122) is embedded in the bottom section of the threaded connection hole (12).

7. The electric valve according to claim 4 or 5, characterized in that, A labyrinth-type sealing structure (72) is formed on the top surface of the bracket (7) that mates with the housing of the electric drive component (5).

8. The electric valve according to claim 7, characterized in that, The labyrinth-type sealing structure (72) is embedded with dustproof cotton (73).

9. The electric valve according to claim 1, characterized in that, The dynamic sealing assembly (6) further includes a sealing ring seat (62), a first sealing ring (63), and a second sealing ring (64). The first sealing ring (63), the sealing ring seat (62), and the second sealing ring (64) are fitted onto the radial outer side wall of the valve stem (4) and arranged sequentially along the axial direction of the valve stem (4). The first sealing ring (63) is used to seal the annular gap between the valve body (1) near the side port of the electric drive component (5) and the valve stem (4). The second sealing ring (64) is used to seal the annular gap between the valve stem (4) and the sealing cover (61). And / or, a third sealing ring (8) is also provided between the sealing cover (61) and the valve body (1).

10. The electric valve according to claim 9, characterized in that, The first sealing ring (63) and the second sealing ring (64) are both star-shaped sealing rings; and / or, the third sealing ring (8) is an O-ring; and / or, the sealing ring seat (62) has an oil guide hole (621) extending radially through its inner and outer annular walls.

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