A low-torque butterfly valve stem and valve plate connection structure

Abstract

This utility model discloses a low-torque butterfly valve stem and valve plate connection structure, relating to the technical field of butterfly valve stem connection tools. It includes a valve body and a valve plate installed inside the valve body. A first sealing sleeve is threaded to the top of the valve body, and a first sealing mechanism is installed inside the first sealing sleeve. A second sealing sleeve is installed at the bottom of the valve body, and a second sealing mechanism is installed inside the second sealing sleeve. A valve stem is installed inside the valve plate. This utility model, through the second sealing sleeve and its rotatable connection, facilitates the reduction of friction between the valve plate and the valve body during valve plate rotation, extending the service life of the valve plate. Simultaneously, the cooperation of the ratchet and ratchet groove facilitates the reduction of the required torque during ratchet rotation, thereby avoiding wear and damage to the bottom of the valve stem and reducing maintenance costs. Ultimately, it solves the problems of excessive torque required for rotation and severe valve stem wear increasing maintenance costs in existing devices.

Description

Technical Field

[0001] This utility model relates to the technical field of butterfly valve stem connection tools, and in particular to a connection structure between the valve stem and valve plate of a low-torque butterfly valve. Background Technology

[0002] Butterfly valves, as a commonly used type of valve, are widely used in many fields such as industrial production and municipal engineering. Their working principle is to drive the valve plate to rotate around the axis through the valve stem, thereby realizing the functions of cutting off and regulating the fluid in the pipeline. During the operation of the butterfly valve, the connection structure between the valve stem and the valve plate plays a crucial role.

[0003] Traditional connection structures often require a large operating torque to drive the valve plate to rotate. This increases the load on the drive device, requiring more powerful and costly drive equipment. On the other hand, the large torque also accelerates the wear of the valve stem, valve plate, and connecting parts, shortens the valve's service life, and increases maintenance costs. Therefore, these problems need to be addressed. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a low-torque butterfly valve stem and valve plate connection structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a low-torque butterfly valve stem and valve plate connection structure, comprising a valve body and a valve plate installed inside the valve body, wherein a first sealing sleeve is threadedly connected to the top of the valve body, a first sealing mechanism is installed inside the first sealing sleeve, a second sealing sleeve is installed at the bottom of the valve body, a second sealing mechanism is installed inside the second sealing sleeve, and a valve stem is installed inside the valve plate.

[0006] Preferably, the top end of the valve stem is inserted into the first sealing sleeve, and the bottom end of the valve stem is inserted into the second sealing sleeve.

[0007] Preferably, a ratchet is installed on the valve stem, a ratchet groove is provided on the inner side of the valve plate to cooperate with the ratchet, and the bottom end of the valve plate is rotatably installed inside the second sealing sleeve.

[0008] Preferably, the first sealing mechanism includes a limiting plate installed inside the first sealing sleeve, the bottom end of the limiting plate is equipped with three layers of stuffing boxes, and both the limiting plate and the stuffing boxes are sleeved on the upper end of the valve stem.

[0009] Preferably, the second sealing mechanism includes a sealing gasket fitted onto the bottom end of the valve stem and a nut threadedly connected to the bottom end of the valve stem, wherein the sealing gasket is located between the nut and the bottom end of the valve plate.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model, through the second sealing sleeve and the rotatable connection with the second sealing sleeve, facilitates the reduction of friction between the valve plate and the valve body when the valve plate rotates, thus extending the service life of the valve plate. At the same time, through the cooperation of the ratchet and the ratchet groove, it facilitates the reduction of the required torque when the ratchet rotates, thereby avoiding wear and damage to the bottom end of the valve stem and reducing maintenance costs. Ultimately, it solves the problems of excessive torque required for rotation and severe wear of the valve stem in existing devices, which increases maintenance costs. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0012] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the device proposed in this utility model;

[0013] Figure 2 This is a schematic cross-sectional view of the device proposed in this utility model;

[0014] Figure 3 This is a schematic diagram of the overall exploded structure of the device proposed in this utility model;

[0015] Figure 4 This is a schematic diagram of the valve stem structure proposed in this utility model;

[0016] Figure 5 The present utility model proposes Figure 2 Enlarged schematic diagram of the structure at part A in the middle.

[0017] The numbers in the diagram are: 1. Valve body; 2. Valve plate; 3. First sealing sleeve; 4. Valve stem; 5. Second sealing sleeve; 6. Limiting plate; 7. Stuffing box; 8. Ratchet; 9. Nut; 10. Sealing gasket. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Example: See Figure 1-5This utility model discloses a low-torque butterfly valve stem and valve plate connection structure, including a valve body 1 and a valve plate 2 installed inside the valve body 1. The valve body 1 facilitates the installation of the valve plate 2; the valve plate 2 facilitates the opening and closing of the valve; a first sealing sleeve 3 is threaded to the top of the valve body 1, which facilitates the installation of a limiting plate 6; a first sealing mechanism is installed inside the first sealing sleeve 3; a second sealing sleeve 5 is installed at the bottom of the valve body 1, which facilitates the installation of a second sealing mechanism; a second sealing mechanism is installed inside the second sealing sleeve 5; a valve stem 4 is installed inside the valve plate 2, which facilitates the rotation of the valve plate 2; the top of the valve stem 4 is inserted into the first sealing sleeve 3.

[0020] In this utility model, the bottom end of the valve stem 4 is inserted into the second sealing sleeve 5. A ratchet 8 is installed on the valve stem 4, which facilitates the rotation of the valve plate 2 by engaging with the ratchet groove. The inner side of the valve plate 2 is provided with a ratchet groove that engages with the ratchet 8, and the bottom end of the valve plate 2 is rotatably installed inside the second sealing sleeve 5. The first sealing mechanism includes a limiting plate 6 installed inside the first sealing sleeve 3, which prevents the valve stem 4 from popping out. A three-layer stuffing box 7 is installed at the bottom end of the limiting plate 6, which prevents water leakage from the device. Both the limiting plate 6 and the stuffing box 7 are sleeved on the upper end of the valve stem 4. The second sealing mechanism includes a sealing gasket 10 sleeved on the bottom end of the valve stem 4 and a nut 9 threadedly connected to the bottom end of the valve stem 4. The sealing gasket 10 prevents water leakage from the bottom end of the device, and the nut 9 facilitates the lifting of the sealing gasket 10 to fit tightly against the bottom end of the valve body 1. The sealing gasket 10 is located between the nut 9 and the bottom end of the valve plate 2.

[0021] Working principle: When this utility model is used, the valve stem 4 is driven to rotate through the transmission component. The valve stem 4 drives the valve plate 2 to rotate through the ratchet 8 and ratchet groove. Since the bottom end of the valve plate 2 is rotatably connected to the valve body 1, the friction between the bottom end of the valve plate 2 and the valve body 1 is small when the valve plate 2 rotates, which avoids damage to the bottom end of the valve plate 2. In addition, the ratchet 8 and ratchet groove can greatly reduce the required torque. The cooperation of the three-layer stuffing box 7 and the sealing gasket 10 can prevent water leakage of the device. And the limit plate 6 can prevent the valve stem 4 from popping out of the first sealing sleeve 3 after being installed by thread.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A low torque butterfly valve stem and disc connection structure, comprising a valve body (1) and a valve disc (2) installed inside the valve body (1), characterized in that: The valve body (1) is threaded to the top end with a first sealing sleeve (3), and a first sealing mechanism is installed inside the first sealing sleeve (3). The valve body (1) is fitted with a second sealing sleeve (5), and a second sealing mechanism is installed inside the second sealing sleeve (5). The valve plate (2) is fitted with a valve stem (4).

2. The low torque butterfly valve stem-to-disc connection of claim 1, wherein: The top end of the valve stem (4) is inserted into the first sealing sleeve (3), and the bottom end of the valve stem (4) is inserted into the second sealing sleeve (5).

3. The low torque butterfly valve stem-to-disc connection of claim 2, wherein: A ratchet (8) is installed on the valve stem (4), and a ratchet groove that matches the ratchet (8) is opened on the inner side of the valve plate (2). The bottom end of the valve plate (2) is rotatably installed inside the second sealing sleeve (5).

4. The low torque butterfly valve stem-to-disc connection of claim 3, wherein: The first sealing mechanism includes a limiting plate (6) installed inside the first sealing sleeve (3).

5. The low torque butterfly valve stem-to-disc connection of claim 4, wherein: The bottom end of the limiting plate (6) is equipped with a three-layer stuffing box (7), and both the limiting plate (6) and the stuffing box (7) are sleeved on the upper end of the valve stem (4).

6. The low torque butterfly valve stem-to-disc connection of claim 5, wherein: The second sealing mechanism includes a sealing gasket (10) sleeved on the bottom end of the valve stem (4) and a nut (9) threadedly connected to the bottom end of the valve stem (4). The sealing gasket (10) is located between the nut (9) and the bottom end of the valve plate (2).

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