A locking structure for preventing self-locking of a valve

Abstract

A locking structure for preventing the self-locking of a valve, comprising a screw rod and a valve plug assembly controlled by the screw rod to open or close; a positioning plate is arranged at the connection between the screw rod and the valve plug assembly to limit the valve plug assembly; a guide hole is formed in the middle of the positioning plate to facilitate the connection between the screw rod and the valve plug assembly; at least one first stop block is formed in the guide hole; a second stop block is formed at the end of the valve plug assembly to abut against the first stop block to limit the movement of the valve plug assembly; a driving gear is sleeved on the screw rod to drive the rotation of the screw rod; compared with the prior art, the positioning plate is arranged at the connection between the screw rod and the valve plug assembly to limit the valve plug assembly, and the first stop block is arranged on the positioning plate to limit the movement of the valve plug assembly, so that when the valve plug assembly is in place during the opening operation, the valve plug assembly collides with the positioning plate, thereby reducing the influence on the screw rod sleeved on the positioning plate.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and specifically to a locking structure for preventing valves from self-locking. Background Technology

[0002] The motor valve for gas meters is one of the core control components of smart gas meters. It is responsible for automatically opening or cutting off the gas supply under remote commands or preset conditions. It is used to realize the safe switching of gas meters, cost management, home safety inspection and user management. It realizes the remote on and off of gas by driving the valve core through a low-power motor. It has key characteristics such as high reliability, high sealing performance, low power consumption and safe shutdown in case of power failure.

[0003] Existing gas meter motor valves typically include a motor, a screw, and a valve plug. During use, the motor drives the screw to rotate, which in turn drives the valve plug fitted on the screw to move axially. The axial movement of the valve plug controls the opening or closing of the valve port.

[0004] Chinese patent CN206754566U discloses a screw-type motor valve, including a valve body, a bracket mounted on the valve body, and a drive mechanism for driving the bracket to move back and forth relative to the valve body. A bellows is fitted onto the bracket for selectively sealing the valve body. The drive mechanism includes a motor, a planetary gearbox, an internal gear disc, a drive screw, and a drive nut. The input end of the planetary gearbox is connected to the motor shaft, and the output end meshes with the internal teeth on the internal gear disc. The drive screw is positioned on the center line of the internal gear disc and is rotatably connected to it. A blocking post is provided on the end face of the internal gear disc facing the drive screw. A guide member is detachably fixed to the drive screw, and the rotational drive of the drive screw by the internal gear disc is achieved through the abutment of the blocking post and the guide member.

[0005] The aforementioned motor valve has a boss on the screw and a corresponding protrusion on the drive nut. When the motor valve is in the opening position, the external thread of the screw and the internal thread of the nut are tightened by the torque of the planetary gearbox, which generates a large frictional torque between the nut and the screw, causing self-locking. When the motor provides low-power valve closing drive, the frictional torque generated during valve opening may cause jamming between the screw and the nut, resulting in the failure of the motor valve's closing function and creating a safety hazard. Utility Model Content

[0006] The present invention aims to overcome the defects in the prior art and provide a stable, safe and reliable locking structure for preventing valve self-locking.

[0007] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a locking structure for preventing valve self-locking, comprising a screw and a valve plug assembly controlled by the screw to open or close; a positioning plate for limiting the valve plug assembly is provided at the connection between the screw and the valve plug assembly, and a guide hole is formed in the middle of the positioning plate to facilitate the screw passing through the positioning plate and connecting with the valve plug assembly; at least one first stop block is formed in the guide hole, and a second stop block is formed at the end of the valve plug assembly to abut against the first stop block to restrict the movement of the valve plug assembly; a drive gear for driving the screw to rotate is sleeved on the screw; the drive gear and the first stop block are respectively located at opposite ends of the screw.

[0008] As a preferred embodiment of the present invention, the valve plug assembly includes a valve plug body and a valve sleeve that move synchronously, with the valve sleeve sleeved onto the screw.

[0009] As a preferred embodiment of this utility model, the screw has an external thread structure, and the valve sleeve has an internal thread structure that matches the external thread structure.

[0010] In a preferred embodiment of the present invention, the second stop block is formed at the end of the valve sleeve, and the second stop block extends outward along the axial direction of the valve sleeve.

[0011] As a preferred embodiment of this utility model, the screw has a snap-fit ​​protrusion arranged in the radial direction of the screw, and the inner ring of the drive gear has a snap-fit ​​groove that snaps into the snap-fit ​​protrusion.

[0012] In a preferred embodiment of this utility model, the snap-fit ​​protrusion and the first stop block are located at opposite ends of the screw.

[0013] In a preferred embodiment of this utility model, the guide hole and the screw are in clearance fit, and the second stop block and the screw do not interfere with each other.

[0014] As a preferred embodiment of this utility model, a plurality of the first stop blocks are arranged at equal intervals along the inner wall of the guide hole.

[0015] In a preferred embodiment of this utility model, the guide hole is provided along the axial direction of the screw, and the size of the guide hole corresponds to the size of the valve sleeve.

[0016] As a preferred embodiment of this utility model, a guide sleeve covering part of the valve sleeve is formed in the middle of the positioning plate, and the guide hole is located inside the guide sleeve.

[0017] Compared with the prior art, by setting a positioning plate at the connection between the screw and the valve plug assembly to limit the movement of the valve plug assembly, and setting a first stop block on the positioning plate to limit the movement of the valve plug assembly, the valve plug assembly collides and abuts against the positioning plate when the valve is in the opening position, reducing the impact on the screw that passes through the positioning plate. At the same time, under the action of the drive gear sleeved on the screw, the stability of the screw during rotation is enhanced, preventing the nut and the screw from self-locking due to the large frictional torque generated. Attached Figure Description

[0018] Figure 1 This is an exploded view of this utility model; Figure 2 This is a schematic diagram showing the connection between the valve plug assembly and the positioning plate; Figure 3 This is a cross-sectional view of the valve plug assembly and the positioning plate; Figure 4 This is a schematic diagram of the connection between the screw and the drive gear; Reference numerals: screw 1, snap-fit ​​protrusion 11, external thread structure 12, valve plug assembly 2, valve plug body 21, valve sleeve 22, internal thread structure 23, second stop block 24, positioning plate 3, guide hole 31, first stop block 32, guide sleeve 33, drive gear 4, snap-fit ​​groove 41. Detailed Implementation

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] like Figures 1-4 As shown, a locking structure for preventing valve self-locking includes a screw 1 and a valve plug assembly 2 controlled by the screw 1 to open or close; a positioning plate 3 for limiting the valve plug assembly 2 is provided at the connection between the screw 1 and the valve plug assembly 2, and a guide hole 31 is formed in the middle of the positioning plate 3 to facilitate the screw 1 to pass through the positioning plate 3 and connect with the valve plug assembly 2; at least one first stop block 32 is formed in the guide hole 31, and a second stop block 24 is formed at the end of the valve plug assembly 2 to abut against the first stop block 32 to limit the movement of the valve plug assembly 2; a drive gear 4 for driving the screw 1 to rotate is sleeved on the screw 1; the drive gear 4 and the first stop block 32 are respectively located at opposite ends of the screw 1.

[0021] The screw 1 drives the valve plug assembly 2 to move along the axial direction of the screw 1, thereby controlling the opening or closing of the valve port by the valve plug assembly 2. The positioning plate 3 is installed in the valve body. During use, the positioning plate 3 is always in a relatively stationary state, so that the first stop block 32 is always located in a relative position in the valve body. During the movement of the valve plug assembly 2, the second stop block 24 is driven to move synchronously. When the second stop block 24 abuts against the first stop block 32, the limiting abutment between the valve plug assembly 2 and the positioning plate 3 is realized.

[0022] The valve plug assembly 2 includes a valve plug body 21 and a valve sleeve 22 that move synchronously. The valve sleeve 22 is sleeved on the screw 1. An external thread structure 12 is formed on the screw 1. An internal thread structure 23 that is adapted to the external thread structure 12 is formed inside the valve sleeve 22.

[0023] During rotation, the screw 1 is always in a relative position, and the screw 1 and the valve sleeve 22 are connected by a threaded connection through the internal thread structure 23 and the external thread structure 12. Thus, under the action of the screw 1 always being in a relative position, the valve sleeve 22 is driven to move along the axial direction of the screw 1, thereby driving the valve plug body 21 to move synchronously, so as to realize the control of opening or closing the valve port.

[0024] The second stop block 24 is formed at the end of the valve sleeve 22 and extends outward along the axial direction of the valve sleeve 22. During the threaded connection between the screw 1 and the valve sleeve 22, the second stop block 24 does not affect the connection between the screw 1 and the valve sleeve 22.

[0025] A locking protrusion 11 is formed on the screw 1 along the radial direction of the screw 1, and a locking groove 41 is formed on the inner ring of the drive gear 4 to engage with the locking protrusion 11. Under the action of the locking protrusion 11 and the locking groove 41, the rotation of the drive gear 4 synchronously drives the rotation of the screw 1.

[0026] The snap-fit ​​protrusion 11 and the first stop block 32 are located at opposite ends of the screw 1. The guide hole 31 is clearance-fitted with the screw 1, the second stop block 24 does not interfere with the screw 1, the screw 1 is set through the guide hole 31, and the screw 1 does not interfere with the second stop block 24 during rotation, ensuring the stable rotation of the screw 1.

[0027] Several first stop blocks 32 are arranged at equal intervals along the inner wall of the guide hole 31. The number of first stop blocks 32 is set according to actual needs. When the second stop block 24 abuts against one of the first stop blocks 32, the abutment between the valve plug assembly 2 and the positioning plate 3 is realized.

[0028] The guide hole 31 is set along the axial direction of the screw 1, and the size of the guide hole 31 corresponds to the size of the valve sleeve 22.

[0029] The positioning plate 3 has a guide sleeve 33 formed in the middle of the valve sleeve 22, and the guide hole 31 is located in the guide sleeve 33, which plays a role in guiding and limiting the valve sleeve 22 during the movement.

[0030] In actual use, when the motor valve is opened, the motor drives the output gear meshing with the drive gear 4 to rotate, thereby synchronously driving the drive gear 4 and the screw 1 to rotate. During the rotation of the screw 1, the valve plug assembly 2 is driven to retract along the axial direction of the screw 1 until the second stop block 24 on the valve sleeve 22 abuts against the first stop block 32 on the positioning plate 3, thereby limiting the retraction movement of the valve plug assembly 2. At this time, one end of the screw 1 is supported by the snapping action of the snapping protrusion 11 and the snapping groove 41, and the other end of the screw 1 is supported by the abutment action of the first stop block 32 and the second stop block 24, reducing the axial runout of the screw 1 at the moment of limit abutment of the valve sleeve 22.

[0031] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0032] Although this document frequently uses reference numerals from the figures, such as screw 1, snap-fit ​​protrusion 11, external thread structure 12, valve plug assembly 2, valve plug body 21, valve sleeve 22, internal thread structure 23, second stop block 24, positioning plate 3, guide hole 31, first stop block 32, guide sleeve 33, drive gear 4, and snap-fit ​​groove 41, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A locking structure for preventing valve self-locking, comprising a screw (1) and a valve plug assembly (2) controlled to open or close by the screw (1); characterized in that, A positioning plate (3) for limiting the valve plug assembly (2) is provided at the connection between the screw (1) and the valve plug assembly (2). A guide hole (31) is formed in the middle of the positioning plate (3) to facilitate the screw (1) to pass through the positioning plate (3) and connect with the valve plug assembly (2). At least one first stop block (32) is formed in the guide hole (31). A second stop block (24) is formed at the end of the valve plug assembly (2) to abut against the first stop block (32) to limit the movement of the valve plug assembly (2). A drive gear (4) for driving the screw (1) to rotate is sleeved on the screw (1). The drive gear (4) and the first stop block (32) are located at opposite ends of the screw (1).

2. A locking structure for preventing valve self-locking according to claim 1, characterized in that, The valve plug assembly (2) includes a valve plug body (21) and a valve sleeve (22) that move synchronously, with the valve sleeve (22) fitted onto the screw (1).

3. A locking structure for preventing valve self-locking according to claim 2, characterized in that, The screw (1) has an external thread structure (12), and the valve sleeve (22) has an internal thread structure (23) that is compatible with the external thread structure (12).

4. A locking structure for preventing valve self-locking according to claim 2, characterized in that, The second stop block (24) is formed at the end of the valve sleeve (22) and extends outward along the axial direction of the valve sleeve (22).

5. A locking structure for preventing valve self-locking according to claim 1, characterized in that, The screw (1) has a snap-fit ​​protrusion (11) arranged in the radial direction of the screw (1), and the inner ring of the drive gear (4) has a snap-fit ​​groove (41) that snaps into the snap-fit ​​protrusion (11).

6. A locking structure for preventing valve self-locking according to claim 5, characterized in that, The snap-fit ​​protrusion (11) and the first stop block (32) are located at opposite ends of the screw (1).

7. A locking structure for preventing valve self-locking according to claim 1, characterized in that, The guide hole (31) is clearance-fitted with the screw (1), and the second stop block (24) does not interfere with the screw (1).

8. A locking structure for preventing valve self-locking according to claim 1, characterized in that, Several first stop blocks (32) are arranged at equal intervals along the inner wall of the guide hole (31).

9. A locking structure for preventing valve self-locking according to claim 2, characterized in that, The guide hole (31) is set along the axial direction of the screw (1), and the size of the guide hole (31) corresponds to the size of the valve sleeve (22).

10. A locking structure for preventing valve self-locking according to claim 9, characterized in that, The positioning plate (3) has a guide sleeve (33) formed in the middle of the valve sleeve (22) and the guide hole (31) is located inside the guide sleeve (33).

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