A valve stem structure with double thread drive

Abstract

This utility model relates to the field of valve technology, specifically disclosing a valve stem structure with double thread drive, comprising: a valve body, a mounting frame fixedly mounted on the top of the valve body via a connecting flange, a handwheel above the mounting frame, a rotating sleeve inside the mounting frame, an output component between the rotating sleeve and the handwheel, a gate connected to the bottom of the rotating sleeve via a transmission component, and an observation mechanism on the rotating sleeve; this utility model, through the observation mechanism located on the outside of the rotating sleeve, utilizes the characteristic that the rotating sleeve drives the moving block to move linearly, so that the pointer moves synchronously with the moving block and accurately indicates on the scale plate, effectively solving the problem that traditional non-thread valves cannot intuitively determine the gate position. This structure, while maintaining the compact advantage of non-thread valves, achieves real-time visualization of the opening and closing status, greatly improving operational accuracy and safety, avoiding errors caused by estimation based on experience, and facilitating use.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a valve stem structure with double thread transmission. Background Technology

[0002] The valve stem concealed structure is a specific design form of gate valve. Its core feature is that the valve stem itself only rotates and does not perform axial lifting or lowering movement. This structure directly fixes the valve stem nut to the top of the gate, so that when the handwheel drives the valve stem to rotate, the threaded pair drives the gate to move linearly up and down along the valve body guide rail, thereby realizing the opening and closing of the valve. Since the valve stem is always hidden in the valve body and not exposed, the biggest advantage of this design is that it greatly saves installation space and keeps the overall height of the valve constant. It is particularly suitable for pipeline applications with height restrictions, such as underground valve wells and ship cabins.

[0003] When using a valve with a non-rising stem, it is not possible to visually determine the opening and closing status of the gate, and it is difficult to clearly know the height of the gate's rise and fall. Unlike valves with rising stems, operators cannot quickly determine whether the valve is fully open, fully closed, or in an intermediate state by observing the extension length of the valve stem. Usually, it is necessary to count the number of handwheel turns to make a judgment, which affects the use. Utility Model Content

[0004] The purpose of this invention is to provide a valve stem structure with double thread drive to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A valve stem structure with double thread drive includes: a valve body, a mounting frame fixedly mounted on the top of the valve body via a connecting flange, a handwheel above the mounting frame, a rotating sleeve inside the mounting frame, an output component between the rotating sleeve and the handwheel, a gate connected to the bottom of the rotating sleeve via a transmission component, and an observation mechanism on the rotating sleeve;

[0007] The observation mechanism includes an external thread on the outer wall of the rotating sleeve, a movable block is threadedly connected to the outer wall of the rotating sleeve, the inner wall of the movable block has a threaded groove adapted to the external thread, an observation component is provided on the movable block, and a guide component is provided between the movable block and the mounting frame.

[0008] Preferably, the observation component includes a pointer fixedly mounted on the outer wall of the moving block, the end of the pointer passing through the mounting frame and extending outward, and a scale plate adapted to the pointer being fixedly mounted on the outer wall of the mounting frame.

[0009] Preferably, the guide assembly includes a connecting plate fixedly mounted on the outer wall of the movable block, and a plurality of guide rods are slidably mounted through the connecting plate, with the tops of the plurality of guide rods fixedly connected to the top of the mounting frame.

[0010] Preferably, the output component includes a rotating block that extends through and rotatably disposed on the top of the mounting frame, the top of the rotating block being fixedly connected to the bottom of the handwheel.

[0011] Preferably, a connecting rod is fixedly provided at the bottom of the rotating block, the connecting rod is inserted inside the rotating sleeve, a plurality of limiting strips are fixedly provided on the outer side wall of the connecting rod, and a limiting groove adapted to the limiting strips is opened on the inner side wall of the rotating sleeve, the limiting strips are inserted into the limiting grooves.

[0012] Preferably, the transmission assembly includes a transmission rod that passes through and is rotatably disposed on the top of the valve body, a pressure cap is fixedly disposed on the top of the valve body, and the top of the transmission rod passes through the pressure cap and is fixedly connected to the bottom of the rotating sleeve.

[0013] Preferably, a nut is fixedly provided on the top of the gate plate, and a screw rod is threaded through and connected to the nut. The top of the screw rod is fixedly connected to the bottom of the transmission rod, and a slot adapted to the screw rod is provided on the top of the gate plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] By using an observation mechanism located on the outside of the rotating sleeve, the linear movement of the moving block driven by the rotation of the sleeve allows the pointer to move synchronously with the moving block and accurately indicate the position on the scale plate. This effectively solves the problem that traditional non-steam valves cannot intuitively determine the gate position. While maintaining the compact advantage of non-steam valves, this structure achieves real-time visualization of the opening and closing status, greatly improving operational accuracy and safety, and avoiding errors caused by estimation based on experience. It has high practical value and promotional significance. Attached Figure Description

[0016] Figure 1 This is one of the perspective views of this utility model;

[0017] Figure 2 This is a second perspective view of the present utility model;

[0018] Figure 3 This is a cross-sectional view of the mounting frame in this utility model;

[0019] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle;

[0020] Figure 5 This is a schematic diagram of the connection structure between the rotating sleeve and the moving block in this utility model;

[0021] Figure 6 This is a schematic diagram of the transmission component in this utility model;

[0022] In the diagram: 1. Valve body; 2. Connecting flange; 3. Mounting frame; 4. Handwheel; 5. Rotating sleeve; 6. Gland; 7. Gate; 8. Moving block; 9. Pointer; 10. Scale plate; 11. Connecting plate; 12. Guide rod; 13. Rotating block; 14. Connecting rod; 15. Transmission rod; 16. Nut; 17. Screw. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1:

[0025] Please see Figure 1 - Figure 6 As shown, a valve stem structure with double thread drive includes: a valve body 1, a mounting frame 3 fixedly mounted on the top of the valve body 1 via a connecting flange 2, a handwheel 4 above the mounting frame 3, a rotating sleeve 5 inside the mounting frame 3, an output component between the rotating sleeve 5 and the handwheel 4, a gate plate 7 connected to the bottom of the rotating sleeve 5 via a transmission component, and an observation mechanism on the rotating sleeve 5.

[0026] The observation mechanism includes an external thread on the outer wall of the rotating sleeve 5. A movable block 8 is threadedly connected to the outer wall of the rotating sleeve 5. A threaded groove adapted to the external thread is opened on the inner wall of the movable block 8. An observation component is provided on the movable block 8. A guide component is provided between the movable block 8 and the mounting frame 3.

[0027] As can be seen from the above, by meshing the external thread on the outer side of the rotating sleeve 5 with the thread groove on the inner side of the moving block 8, when the rotating sleeve 5 rotates with the output component, it will drive the moving block 8 to generate a precise linear displacement along the axial direction. The moving block 8 slides with multiple guide rods 12 through the connecting plate 11 to ensure that its movement is smooth and without deflection. The pointer 9 fixed on the outer side of the moving block 8 moves synchronously with it and clearly indicates the real-time position of the gate 7 on the scale plate 10 on the outer side of the mounting frame 3. The internal thread rotation movement is converted into an externally visible linear indication, which solves the problem that the opening height of the traditional non-sunken valve cannot be intuitively judged.

[0028] It should be noted that this device sets the lead of the internal screw 17 to twice the lead of the outer thread of the rotating sleeve 5 (or other multiples, which can be flexibly configured according to design requirements). When the handwheel 4 is rotated, the axial displacement generated by the screw 17 for each rotation of the handwheel 4 is twice (or other multiples) the displacement of the moving block 8 driven by the rotating sleeve 5. This reduces the height of the rotating sleeve 5 and the mounting frame 3, making the valve more compact. While ensuring that the required full stroke of the gate 7 remains unchanged, it reduces the height requirement of the rotating sleeve 5 and its installation space, thereby effectively compressing the overall external structural dimensions of the valve. While maintaining all the mechanical functions and sealing performance of the non-stick valve, it makes its structure more compact and suitable for installation scenarios with limited height.

[0029] Specifically, regarding the aforementioned observation component and guide component, the observation component includes a pointer 9 fixedly mounted on the outer wall of the movable block 8, the end of the pointer 9 passing through the mounting frame 3 and extending outward, and a scale plate 10 adapted to the pointer 9 is fixedly mounted on the outer wall of the mounting frame 3.

[0030] The guide assembly includes a connecting plate 11 fixedly mounted on the outer wall of the movable block 8. Multiple guide rods 12 are slidably mounted through the connecting plate 11, and the tops of the multiple guide rods 12 are fixedly connected to the top of the mounting frame 3.

[0031] As can be seen from the above, the cooperation between pointer 9 and scale plate 10 constitutes a direct visual feedback system for valve opening. The operator can accurately grasp the opening and closing status of gate 7 without having to memorize the number of handwheel turns, which improves the intuitiveness and accuracy of operation. The guide assembly composed of guide rod 12 and connecting plate 11 effectively restricts the circumferential rotation of moving block 8, ensuring that it can only slide along the axial direction of guide rod 12. This ensures that the linear correspondence between the position indicated by pointer 9 and the actual position of gate 7 is accurate and reliable, avoiding indication errors caused by mechanism shaking or jamming.

[0032] Example 2:

[0033] Specifically, regarding the aforementioned output component and transmission component, the output component includes a rotating block 13 that passes through and rotatably mounts on the top of the mounting frame 3, with the top of the rotating block 13 and the bottom of the handwheel 4 fixedly connected;

[0034] A connecting rod 14 is fixedly installed at the bottom of the rotating block 13. The connecting rod 14 is inserted into the rotating sleeve 5. Multiple limiting strips are fixedly installed on the outer side wall of the connecting rod 14. A limiting groove adapted to the limiting strip is opened on the inner side wall of the rotating sleeve 5. The limiting strip is inserted into the limiting groove.

[0035] The transmission assembly includes a transmission rod 15 that passes through and rotatably disposed on the top of the valve body 1. A pressure cover 6 is fixedly disposed on the top of the valve body 1, and the top of the transmission rod 15 passes through the pressure cover 6 and is fixedly connected to the bottom of the rotating sleeve 5.

[0036] A nut 16 is fixedly installed on the top of the gate plate 7. A screw 17 is threaded through and connected to the nut 16. The top of the screw 17 is fixedly connected to the bottom of the transmission rod 15. A slot adapted to the screw 17 is opened on the top of the gate plate 7.

[0037] As can be seen from the above, in the output component, the rotation of the handwheel 4 is transmitted to the connecting rod 14 through the rotating block 13 fixed to it. The connecting rod 14 transmits the torque to the rotating sleeve 5 efficiently through the insertion and engagement of the limiting strip on its outer side with the limiting groove on the inner side of the rotating sleeve 5, so that it rotates synchronously. In the transmission component, the rotation of the rotating sleeve 5 is transmitted to the screw 17 through the transmission rod 15 fixed to its bottom. The screw 17 and the nut 16 fixedly installed on the top of the gate plate 7 form another key threaded transmission pair, which converts the rotational motion of the screw 17 into the linear lifting motion of the gate plate 7, and finally realizes the opening and closing of the valve. The slot set on the top of the gate plate 7 provides the necessary movement space and auxiliary support for the screw 17.

[0038] Through the coordinated operation of the "double threaded transmission" structure (rotating sleeve 5-moving block 8 threaded pair and screw 17-nut 16 threaded pair), transmission and sealing are achieved in a compact space. At the same time, the position of the internal gate 7 is visualized and monitored through an external observation mechanism. It should be noted that the valve body 1 is equipped with a valve seat and port (not shown in the figure) that are adapted to the gate 7 in the internal cavity. The port facilitates the linear up and down movement of the gate 7.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double threaded actuated valve stem structure, characterized by, include: A valve body (1) is provided with a mounting frame (3) fixed on the top of the valve body (1) by a connecting flange (2). A handwheel (4) is provided above the mounting frame (3). A rotating sleeve (5) is provided inside the mounting frame (3). An output component is provided between the rotating sleeve (5) and the handwheel (4). A gate (7) is connected to the bottom of the rotating sleeve (5) by a transmission component. An observation mechanism is provided on the rotating sleeve (5). The observation mechanism includes an external thread on the outer wall of the rotating sleeve (5), a movable block (8) is threadedly connected to the outer wall of the rotating sleeve (5), a threaded groove adapted to the external thread is opened on the inner wall of the movable block (8), an observation component is provided on the movable block (8), and a guide component is provided between the movable block (8) and the mounting frame (3).

2. A double threaded driving valve rod structure according to claim 1, wherein: The observation component includes a pointer (9) fixedly mounted on the outer wall of the movable block (8), the end of the pointer (9) passing through the mounting frame (3) and extending outward, and a scale plate (10) adapted to the pointer (9) is fixedly mounted on the outer wall of the mounting frame (3).

3. A double threaded driving valve rod structure as claimed in claim 1, wherein: The guide assembly includes a connecting plate (11) fixedly mounted on the outer wall of the movable block (8), and multiple guide rods (12) are slidably mounted through the connecting plate (11), with the tops of the multiple guide rods (12) fixedly connected to the top of the mounting frame (3).

4. A double threaded drive valve rodless structure as claimed in claim 1, wherein: The output component includes a rotating block (13) that passes through and rotatably disposed on the top of the mounting frame (3), the top of the rotating block (13) and the bottom of the handwheel (4) being fixedly connected.

5. The valve stem structure with double thread drive according to claim 4, characterized in that: A connecting rod (14) is fixedly provided at the bottom of the rotating block (13). The connecting rod (14) is inserted inside the rotating sleeve (5). Multiple limiting strips are fixedly provided on the outer side wall of the connecting rod (14). A limiting groove adapted to the limiting strip is opened on the inner side wall of the rotating sleeve (5). The limiting strip is inserted into the limiting groove.

6. The valve stem structure with double thread drive according to claim 1, characterized in that: The transmission assembly includes a transmission rod (15) that passes through and rotates on the top of the valve body (1). A pressure cap (6) is fixedly installed on the top of the valve body (1). The top of the transmission rod (15) passes through the pressure cap (6) and is fixedly connected to the bottom of the rotating sleeve (5).

7. The valve stem structure with double thread drive according to claim 6, characterized in that: A nut (16) is fixedly installed on the top of the gate (7), and a screw (17) is threaded through and connected to the nut (16). The top of the screw (17) is fixedly connected to the bottom of the transmission rod (15), and a slot adapted to the screw (17) is opened on the top of the gate (7).

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