A linear valve actuator and a linear valve having the same

Abstract

This application relates to a linear stroke valve actuator, belonging to the field of valves, comprising a housing and an actuator. The actuator includes a connecting shaft passing through the bottom of the housing and for connection to a valve stem. A protective sleeve is slidably fitted onto the outside of the connecting shaft, and the protective sleeve is fixedly connected to the housing. This application also relates to a linear stroke valve, comprising a valve body and the aforementioned actuator mounted on the valve body. This application reduces the possibility of housing damage and rust, reduces the loss of lubricating oil on the connecting shaft, and avoids jamming during the movement of the connecting shaft.

Description

Technical Field

[0001] This application relates to the field of valves, and more particularly to a linear stroke valve actuator and a linear stroke valve having the actuator. Background Technology

[0002] A linear stroke valve is a valve that uses an actuator to drive the valve stem to move linearly along the axial direction, thereby changing the flow cross section of the valve core or valve seat and thus achieving precise flow regulation.

[0003] The linear stroke valve actuator includes a housing and an actuator mechanism disposed within the housing. The actuator mechanism includes an output shaft extending through the bottom of the housing and a connecting shaft fixed to the bottom end of the output shaft. The bottom end of the connecting shaft is connected to the top end of the valve stem. The actuator mechanism enables the output shaft to drive the connecting shaft to move linearly along the axial direction, thereby causing the valve stem to move synchronously.

[0004] The actuator of a linear stroke valve can be a cylinder piston rod structure, a hydraulic cylinder piston rod structure, or a structure in which the rotational motion is converted into linear displacement by a motor through a transmission device, such as a worm gear structure. The housing of a linear stroke valve actuator is usually made of aluminum alloy. When the connecting shaft moves linearly, it will slide relative to the housing. To prevent jamming during the movement of the connecting shaft, lubricating oil is usually applied to the connecting shaft.

[0005] Regarding the aforementioned technologies, the connecting shaft will continuously rub against the housing during movement. The aluminum alloy housing is easily damaged by friction. In particular, when water seeps between the connecting shaft and the housing, it will not only wash away the lubricating oil on the connecting shaft, but also cause the housing to rust, which will seriously affect the movement of the connecting shaft. Utility Model Content

[0006] To reduce the possibility of damage and rust to the housing, minimize the loss of lubricating oil on the connecting shaft, and prevent jamming during the movement of the connecting shaft, this application provides a linear stroke valve actuator and a linear stroke valve having the actuator.

[0007] In the first aspect, this application provides a linear stroke valve actuator, which adopts the following technical solution:

[0008] A linear stroke valve actuator includes a housing and an actuator. The actuator includes a connecting shaft passing through the bottom of the housing and used for connecting to a valve stem. A protective sleeve is slidably fitted onto the outside of the connecting shaft, and the protective sleeve is fixedly connected to the housing.

[0009] By adopting the above technical solution, a protective sleeve is set between the housing and the connecting shaft. The connecting shaft slides up and down inside the protective sleeve, which can prevent the connecting shaft from directly rubbing against the housing and reduce the possibility of damage and rust to the housing.

[0010] Optionally, the protective cover is made of stainless steel.

[0011] By adopting the above technical solution, since the protective sleeve is made of stainless steel, it is possible to avoid rust on the protective sleeve, which could cause jamming during the movement of the connecting shaft, thus ensuring the smoothness of the connecting shaft movement.

[0012] Optionally, a first sealing ring is provided between the bottom end of the housing and the contact surface of the valve body, encircling the connecting shaft.

[0013] By adopting the above technical solution, the first sealing ring can seal the contact surface between the housing and the valve body, effectively reducing the possibility of water seeping in from the connection between the housing and the valve body, thereby reducing the loss of lubricating oil on the connecting shaft, further preventing jamming during the movement of the connecting shaft, and also reducing the possibility of the housing rusting.

[0014] Optionally, the connecting shaft is provided with a second sealing ring in the circumferential direction, and the second sealing ring abuts tightly against the inner wall of the protective sleeve.

[0015] By adopting the above technical solution, the second sealing ring can seal the connection shaft and the protective sleeve, preventing water from seeping into the housing from between the connection shaft and the protective sleeve and causing damage to the actuator or circuit board and other structures.

[0016] Optionally, a third sealing ring is provided circumferentially on the outer side of the protective sleeve, and the third sealing ring abuts tightly against the shell.

[0017] By adopting the above technical solution, the third sealing ring can seal the space between the protective sleeve and the housing, preventing water from seeping into the housing from between the protective sleeve and the housing.

[0018] Optionally, the bottom of the housing has a through mounting hole, and the protective sleeve is tightly inserted into the mounting hole.

[0019] Optionally, a flange is provided at the bottom of the mounting hole, and the bottom end of the protective sleeve abuts against the flange.

[0020] By adopting the above technical solution, the mounting hole is used to install the protective cover, and the flange can limit the position of the protective cover to ensure the accuracy of the installation position.

[0021] Optionally, a gap is left between the inner wall of the flange and the connecting shaft.

[0022] By adopting the above technical solution, a gap is left between the inner wall of the flange and the connecting shaft, which can avoid direct contact between the connecting shaft and the housing and thus prevent friction, ensuring the smoothness of the connecting shaft movement.

[0023] Optionally, the actuator includes an output shaft fixedly mounted at the top of the connecting shaft, the bottom end of the output shaft being inserted into the protective sleeve, and a gap being left between the output shaft and the inner wall of the protective sleeve.

[0024] By adopting the above technical solution, a gap is left between the output shaft and the inner wall of the protective sleeve, which can avoid friction between the output shaft and the protective sleeve and reduce the friction force during the movement of the connecting shaft.

[0025] Optionally, the housing includes an upper housing and a lower housing that are arranged vertically and interlocked with each other, and a fourth sealing ring is provided between the interlocking surfaces of the upper housing and the lower housing.

[0026] By adopting the above technical solution, the fourth sealing ring can seal the space between the upper and lower housings, preventing water from seeping into the housing from between the upper and lower housings, thus improving the overall waterproof effect of the actuator.

[0027] Secondly, this application provides a linear stroke valve, which adopts the following technical solution:

[0028] A linear stroke valve includes a valve body and the aforementioned actuator mounted on the valve body.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] By installing a protective sleeve between the housing and the connecting shaft, direct friction between the connecting shaft and the housing can be avoided, reducing the possibility of damage and rust to the housing.

[0031] By using a stainless steel protective sleeve, rust can be prevented, thus avoiding jamming during the movement of the connecting shaft.

[0032] By setting the first sealing ring, the contact surface between the housing and the valve body can be sealed, thereby reducing the loss of lubricating oil on the connecting shaft and further preventing jamming during the movement of the connecting shaft.

[0033] By setting a second, third, and fourth sealing ring, the overall waterproof performance of the actuator can be effectively improved. Attached Figure Description

[0034] Figure 1 This is a cross-sectional view of the linear stroke valve according to an embodiment of this application;

[0035] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0036] Figure 3 This is a schematic diagram of the structure of the linear valve actuator according to an embodiment of this application;

[0037] Figure 4 This is a partial cross-sectional view of the linear stroke valve according to an embodiment of this application;

[0038] Figure 5 yes Figure 1 A magnified view of a section at point B.

[0039] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Upper housing; 111. Connecting hole; 112. Waterproof plug; 12. Lower housing; 121. Fourth sealing groove; 122. Fourth sealing ring; 123. Mounting hole; 124. Flange; 13. Boss; 131. First sealing ring; 2. Actuator; 21. Mounting base; 22. Gear set; 23. Output shaft; 24. Motor; 25. Circuit board; 3. Connecting shaft; 31. Second sealing groove; 32. Second sealing ring; 4. Protective sleeve; 41. Third sealing groove; 42. Third sealing ring; 5. Valve body; 51. First sealing groove; 52. Valve stem; 53. Valve core. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0041] This application discloses a linear stroke valve actuator.

[0042] Reference Figure 1 A linear stroke valve actuator includes a housing 1, an actuator 2 disposed inside the housing 1, and a connecting shaft 3 for connecting to the valve stem 52 inside the valve body 5.

[0043] Reference Figure 1 The actuator 2 can be a cylinder piston rod structure, a hydraulic cylinder piston rod structure, or a structure in which the motor 24 converts rotational motion into linear displacement through a transmission device, such as a worm gear structure. In this embodiment, the actuator 2 includes a mounting base 21 fixedly installed in the housing 1, a gear set 22 mounted on the mounting base 21, an output shaft 23 meshing with the output gear of the gear set 22 and having a screw structure, a motor 24 mounted on the mounting base 21 and used to drive the input gear of the gear set 22 to rotate, and a circuit board 25 fixedly installed in the housing 1 and electrically connected to the motor 24. The output shaft 23 is vertically arranged at the top of the connecting shaft 3 and fixedly connected to the top of the connecting shaft 3. In this embodiment, the output shaft 23 and the connecting shaft 3 are integrally machined. The bottom end of the connecting shaft 3 is used to connect to the top of the valve stem 52 and drive the valve stem 52 to move in the vertical direction.

[0044] When the valve opening needs to be adjusted, the circuit board 25 sends an electrical signal to control the motor 24 to start and drive the input gear of the gear set 22 to rotate. Under the transmission action of the gear set 22, the output shaft 23 is driven to move in the vertical direction, which in turn drives the connecting shaft 3 and the valve stem 52 to move synchronously.

[0045] Reference Figure 1 and Figure 2 The housing 1 includes an upper housing 11 and a lower housing 12. The upper housing 11 is located above the lower housing 12, and the upper housing 11 and the lower housing 12 are interlocked and fixedly connected by bolts. A fourth sealing groove 121 is formed around the top surface of the lower housing 12, and a matching fourth sealing ring 122 is provided in the fourth sealing groove 121. The fourth sealing ring 122 abuts tightly against both the upper housing 11 and the lower housing 12, and plays a sealing role between the upper housing 11 and the lower housing 12.

[0046] Reference Figure 3 The top surface of the upper housing 11 and the bottom surface of the lower housing 12 are provided with several connection holes 111 for mounting a dial, Bluetooth, manual adjustment knob, and for threading wires through the temperature sensor and pressure sensor. Waterproof plugs 112 are installed on the connection holes 111.

[0047] Reference Figure 1 and Figure 4 The bottom of the lower housing 12 is integrally provided with a boss 13. The bottom surface of the boss 13 is used to abut against the top surface of the valve body 5. A first sealing ring 131 is provided around the bottom surface of the boss 13 and the top surface of the valve body 5. The first sealing ring 131 abuts tightly against the boss 13 and the valve body 5, and plays a sealing role at the connection between the valve body 5 and the housing 1. This reduces the possibility of water seeping into the connection between the housing 1 and the valve body 5, thereby reducing the loss of lubricating oil on the connecting shaft 3, preventing jamming during the movement of the connecting shaft 3, and also reducing the possibility of rust on the housing 1.

[0048] Reference Figure 1 The lower housing 12 has a mounting hole 123 with a through boss 13 at its bottom. A protective sleeve 4 with an annular cross-section is inserted into the mounting hole 123. The protective sleeve 4 is made of stainless steel. The connecting shaft 3 is slidably inserted into the protective sleeve 4 in the vertical direction. The bottom end of the connecting shaft 3 extends out of the protective sleeve 4 and the mounting hole 123 and is used to connect with the top end of the valve stem 52. The outer wall of the protective sleeve 4 fits against the inner wall of the mounting hole 123, and the inner wall of the protective sleeve 4 fits against the outer circumferential surface of the connecting shaft 3. A flange 124 is provided at the bottom of the mounting hole 123. The flange 124 is integrally formed with the lower housing 12. The bottom end of the protective sleeve 4 abuts against the flange 124 to limit the movement of the protective sleeve 4. To prevent the connecting shaft 3 from rubbing against the flange 124 during sliding, a gap is left between the inner wall of the flange 124 and the connecting shaft 3. The bottom end of the output shaft 23 is located inside the protective sleeve 4, and a gap is left between the output shaft 23 and the inner wall of the protective sleeve 4.

[0049] The protective sleeve 4 can isolate the housing 1 and the connecting shaft 3, preventing the connecting shaft 3 from directly rubbing against the housing 1 and reducing the possibility of damage and rust to the housing 1. At the same time, since the protective sleeve 4 is made of stainless steel, it can prevent rust from forming on the protective sleeve 4, which could cause the connecting shaft 3 to jam during movement.

[0050] Reference Figure 4 The top of the connecting shaft 3 has an annular second sealing groove 31 along the circumferential direction. A second sealing ring 32 is fitted inside the second sealing groove 31. The second sealing ring 32 abuts tightly against the inner wall of the protective sleeve 4, which plays a sealing role between the connecting shaft 3 and the protective sleeve 4, preventing water from seeping into the interior of the housing 1.

[0051] Reference Figure 5 The top of the protective sleeve 4 is provided with an annular third sealing groove 41 along the circumferential direction. A third sealing ring 42 is fitted inside the third sealing groove 41. The third sealing ring 42 is in close contact with the inner wall of the mounting hole 123, which plays a sealing role between the protective sleeve 4 and the lower shell 12, thereby improving the waterproof effect of the shell 1.

[0052] This application also discloses a linear stroke valve, as described in the embodiments below. Figure 1 and Figure 4 The device includes a valve body 5 and the aforementioned actuator mounted on the valve body 5. A first sealing groove 51 is provided on the contact surface between the top end of the valve body 5 and the bottom end of the housing 1 for embedding the first sealing ring 131. The first sealing groove 51 can limit the first sealing ring 131 and ensure the sealing effect between the valve body 5 and the actuator.

[0053] Reference Figure 1 A valve stem 52 is slidably mounted vertically inside the valve body 5. The top end of the valve stem 52 is connected to the bottom end of the connecting shaft 3, and in this embodiment, the top end of the valve stem 52 and the bottom end of the connecting shaft 3 are engaged. A valve core 53 is connected to the bottom end of the valve stem 52 and is disposed within the flow channel of the valve body 5. The actuator controls the connecting shaft 3 to move vertically, causing the valve stem 52 and the valve core 53 to move synchronously, thereby adjusting the opening degree of the linear stroke valve.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] Finally, it should be noted that the above technical solution is only one embodiment of the present invention. For those skilled in the art, based on the application methods and principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the methods described in the above specific embodiments of the present invention. Therefore, the methods described above are only preferred and have no limiting significance.

Claims

1. A linear stroke valve actuator, comprising a housing (1) and an actuator (2), the actuator (2) including a connecting shaft (3) passing through the bottom of the housing (1) and for connection to a valve stem (52), characterized in that, The connecting shaft (3) is fitted with a protective sleeve (4) which is fixedly connected to the housing (1).

2. The linear stroke valve actuator according to claim 1, characterized in that, The protective sleeve (4) is made of stainless steel.

3. The linear stroke valve actuator according to claim 1, characterized in that, A first sealing ring (131) is provided between the bottom end of the housing (1) and the contact surface of the valve body (5) and surrounds the connecting shaft (3).

4. A linear stroke valve actuator according to claim 1, characterized in that, The connecting shaft (3) is provided with a second sealing ring (32) in the circumferential direction, and the second sealing ring (32) is in close contact with the inner wall of the protective sleeve (4).

5. A linear stroke valve actuator according to claim 1, characterized in that, The protective sleeve (4) is provided with a third sealing ring (42) in the outer circumference, and the third sealing ring (42) is in close contact with the shell (1).

6. A linear stroke valve actuator according to claim 1, characterized in that, The bottom of the housing (1) has a through mounting hole (123), and the protective sleeve (4) is tightly inserted into the mounting hole (123).

7. A linear valve actuator according to claim 6, characterized in that, A flange (124) is provided at the bottom of the mounting hole (123), and the bottom end of the protective sleeve (4) abuts against the flange (124).

8. A linear stroke valve actuator according to claim 1, characterized in that, The actuator (2) includes an output shaft (23) fixedly installed at the top of the connecting shaft (3), the bottom end of the output shaft (23) is inserted into the protective sleeve (4), and there is a gap between the output shaft (23) and the inner wall of the protective sleeve (4).

9. A linear stroke valve actuator according to claim 1, characterized in that, The housing (1) includes an upper housing (11) and a lower housing (12) that are arranged vertically and locked together. A fourth sealing ring (122) is provided between the locking surfaces of the upper housing (11) and the lower housing (12).

10. A linear stroke valve, characterized in that, It includes a valve body (5) and an actuator as described in any one of claims 1-9 mounted on the valve body (5).

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