Butterfly valve with mechanical limiting function

Abstract

The butterfly valve with the mechanical limiting function comprises a valve body and a valve rod, a bottom cover is arranged on the valve body, a groove is formed in the bottom cover, and a protruding block is arranged on the valve rod. The automatic feeding device has the beneficial effects of improving the working efficiency, reducing the labor cost, reducing the environmental pollution, ensuring the equipment safety, reducing the energy consumption cost, improving the production stability and the like, and can help enterprises to improve the production efficiency and the product quality and reduce the production cost.

Description

Technical Field

[0001] The utility model relates to a butterfly valve, in particular to a butterfly valve with mechanical limit. Background Art

[0002] Butterfly valve is a commonly used valve type. Its main structural feature is that the valve body is automatically controlled by two semicircular butterfly plates. Butterfly valve has the advantages of simple structure, convenient operation and good sealing performance. Therefore, it is widely used in industrial automation, environmental protection and other fields.

[0003] The butterfly valve with mechanical limit is based on the ordinary butterfly valve, and the opening and closing of the valve is realized by adding a mechanical limit structure. The mechanical limit structure is generally realized by mechanical components such as cams, springs, flanges, etc., and the opening and closing of the valve are controlled by the changes of mechanical components.

[0004] Butterfly valves with mechanical limit are mainly used in industrial automation control, petrochemical, pharmaceutical, food and other fields. Since the valve needs to be mechanically limited during the automatic control process, the mechanical structure of the valve is relatively complex and needs to be manufactured with high-strength materials and precision processed and assembled to ensure the normal operation and stability of the valve.

[0005] Since the limit block for the valve plate is added in the flow channel of the valve, the flow area of ​​the valve is reduced and the flow of the medium is disturbed, thus reducing the flow of the medium. Especially for small and medium-caliber valves, the block has a great influence on the reduction of the flow area. Utility Model Content

[0006] In order not to affect the flow channel size of the valve, the utility model provides a butterfly valve with mechanical limit, the limit is set on the end of the valve stem and the bottom cover of the valve, the switch position is limited by the angular displacement between the valve stem and the bottom cover, and the mechanical limit of the fully open and fully closed positions of the valve is provided.

[0007] The technical solution of the utility model is as follows:

[0008] A butterfly valve with mechanical limit comprises a valve and a valve stem. The valve is provided with a bottom cover, a groove is provided in the bottom cover, and a convex block is provided on the valve stem; the groove of the valve is adapted to the convex block of the valve stem.

[0009] Preferably, a first limit surface and a second limit surface are provided on the protrusion of the valve stem, and the angle between the first limit surface and the second limit surface is 120° to 135°.

[0010] Preferably, a straight line where a spatial plane where the first limit surface is located intersects with a spatial plane where the second limit surface is located coincides with the axis of the valve stem.

[0011] Preferably, the length of the first limiting surface is the same as the radius of the valve stem, and the length of the second limiting surface is the same as the radius of the valve stem.

[0012] Preferably, the depth of the groove is greater than the thickness of the protrusion.

[0013] Preferably, a third limiting surface and a fourth limiting surface are provided on the groove, the third limiting surface is in close contact with the first limiting surface or the second limiting surface, and the angle between the third limiting surface and the fourth limiting surface is 225° to 240°.

[0014] Preferably, the cross section of the bottom cover is circular.

[0015] The advantages of the utility model are as follows:

[0016] High reliability: The butterfly valve with mechanical limit has good mechanical properties and stability, and can maintain high-precision control performance during long-term operation.

[0017] Good sealing: The butterfly valve with mechanical limit adopts high-quality sealing materials and precise sealing structure, which can achieve high-precision sealing performance and prevent material leakage.

[0018] High safety: The butterfly valve with mechanical limit adopts a mechanical limit structure, which can ensure that the maximum opening and closing range of the valve will not be exceeded during operation, thereby ensuring the safety of equipment and personnel.

[0019] Simple structure: The butterfly valve with mechanical limit has a simple structure, is easy to install and maintain, and reduces maintenance costs and downtime.

[0020] Easy operation: The butterfly plate and valve seat of the valve are connected by the valve stem, and the valve can be opened and closed by adjusting the valve stem, which is convenient for operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments or background technologies of the present invention, the drawings required for use in the embodiments or background technology descriptions are briefly introduced below. Obviously, the drawings described below are merely embodiments of the present invention, and ordinary technicians in this field can obtain other drawings based on the provided drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the butterfly valve of the utility model;

[0023] Figure 2 It is a cross-sectional view of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the valve stem of the utility model;

[0025] Figure 4 This is a structural cross-sectional view of the valve of the utility model in the fully open position;

[0026] Figure 5 It is a structural cross-sectional view of the valve of the utility model at the middle opening position;

[0027] Figure 6 It is a structural cross-sectional view of the valve of the utility model in the fully closed position.

[0028] In the figure: 1, valve, 2, valve stem, 3, bottom cover, 4, groove, 5, protrusion, 6, first limiting surface, 7, second limiting surface, 8, third limiting surface, 9, fourth limiting surface. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] Embodiment 1:

[0031] See also Figure 1-4 The utility model provides a butterfly valve with mechanical limit, which is used to adjust and control the flow of the medium in the pipeline system, and can limit the opening and closing positions of the butterfly valve, thereby preventing damage caused by excessive opening or closing.

[0032] Common mechanical limit devices include stoppers, springs, and rollers. For example, the stopper can be fixed to the valve body by means of threads or welding. When the butterfly valve opens to a preset angle, the valve disc will hit the stopper, thereby limiting its further opening. The spring can limit the opening or closing of the valve disc through elastic force. When the valve disc moves to a preset position, the spring will be compressed or stretched, preventing the valve disc from moving further.

[0033] The utility model is usually applied in the occasions where it is necessary to accurately control the flow and prevent excessive flow, and can provide stable control performance and a long service life, while also reducing maintenance and replacement costs.

[0034] Since the limit stopper is added to the flow channel of the valve, the flow area of ​​the valve is reduced and the flow of the medium is disturbed, thus reducing the flow rate of the medium. Especially for small and medium-sized valves, the stopper has a great influence on the reduction of the flow area.

[0035] In order not to affect the flow channel size of the valve, we set the limit at the end of the valve stem 2 and the bottom cover 3 of the valve 1, and limit the switch position through the angular displacement between the valve stem 2 and the bottom cover 3, providing mechanical limits for the fully open and fully closed positions of the valve 1.

[0036] See also Figure 3 The utility model processes a protrusion 5 at the end of the valve stem and processes a groove 4 of similar shape on the bottom cover 3 of the valve, and the protrusion 5 of the valve stem 2 can be rotated 90 degrees in the groove 4 of the bottom cover 2, and different rotation angles can be achieved according to the design.

[0037] In this way, the rotation angle of the valve 1 in the valve body is limited within a certain range, and the cooperation between the protrusion 5 and the groove 4 plays a role of mechanical limiting on the rotation of the valve 1.

[0038] See also Figure 1 and Figure 4 and Figure 5 and Figure 6 In the utility model, the groove 4 is provided with a third limiting surface 8 and a fourth limiting surface 9, the third limiting surface 8 is in close contact with the first limiting surface 6 or the second limiting surface 7, and the angle between the third limiting surface 8 and the fourth limiting surface 9 is 225° to 240°. The three working states of the utility model are the valve in the fully open position, the valve in the middle opening position and the valve in the fully closed position. When the valve is in the fully open position, the first limiting surface 6 and the third limiting surface are in close contact, and the second limiting surface 7 is away from the fourth limiting surface 9. When the valve is in the middle opening position, the first limiting surface 6 is away from the third limiting surface 8, and the second limiting surface 7 is away from the fourth limiting surface 9. When the valve is in the fully closed position, the first limiting surface 6 is away from the third limiting surface, and the second limiting surface is in close contact with the fourth limiting surface 9.

[0039] In this embodiment, the cross section of the bottom cover 3 of the present invention is designed to be circular.

[0040] Embodiment 2:

[0041] The utility model is an automatic control valve with simple mechanical structure and stable performance, which is suitable for various pipelines with temperatures not higher than 400°C and medium pressure not higher than 2.5MPa.

[0042] The nominal diameter of the utility model is DN50-200, the nominal pressure of the utility model is 1.0MPa, the materials adopted by the utility model are mainly carbon steel, stainless steel and copper, and the limiting mode of the utility model is mechanical limiting.

[0043] See also Figure 1The utility model is composed of a bottom cover and a valve seat. The outer circle of the valve seat is cylindrical. The bottom cover and the valve seat of the valve are connected by a valve stem. The opening and closing of the valve is achieved by adjusting the valve stem. The valve adopts a mechanical limit structure. By setting a mechanical limit switch, the opening and closing of the valve is controlled to achieve automatic control. The bottom cover and valve seat of the valve are made of high temperature and high pressure resistant materials and can withstand the working pressure and temperature under high temperature and high pressure environments.

[0044] The method of using the utility model is as follows:

[0045] Select the specifications and models of the valve according to actual needs. Before installation, the valve should be disassembled, cleaned, inspected and tested. The installation position of the valve should be selected according to factors such as the medium flow direction, pressure direction, medium temperature, etc. The installation position of the valve should ensure vertical or horizontal installation. The connecting pipes of the valve should be threaded or welded. The joints of the valve should be sealed with gaskets, sealing pads and other sealing materials, and ensure that there is no leakage at the joints. The opening and closing of the valve should be adjusted as needed, which can be controlled by the valve control box or manually. The limit switch of the valve should be set in accordance with regulations and checked and adjusted regularly.

[0046] Embodiment 3:

[0047] The utility model realizes the functions of material flow regulation, temperature control, pressure regulation, etc. by controlling the opening and closing of the butterfly valve during the production process, thereby improving production efficiency and product quality.

[0048] See also Figure 1 and Figure 2 The butterfly valve with mechanical limit provided by the utility model comprises a valve 1 and a valve stem 2, wherein a bottom cover 3 is arranged at the front end of the valve, a groove 4 is arranged inside the bottom cover 3, and the groove 4 of the valve 1 and the protrusion 5 of the valve stem 5 are adapted to each other to achieve the limiting effect.

[0049] See also Figure 3 The protrusion 5 of the utility model is respectively provided with a first limiting surface 6 and a second limiting surface 7, the angle between the first limiting surface 6 and the second limiting surface 7 is 120°~135°, the straight line where the spatial plane where the first limiting surface 6 is located and the spatial plane where the second limiting surface 7 is located intersects with the axis of the valve stem 2, the length of the first limiting surface 6 is adapted to the radius of the valve stem 2, and the length of the second limiting surface 7 is adapted to the radius of the valve stem 2.

[0050] In this embodiment, in order to better cooperate between the valve stem 2 and the bottom cover 3 , the depth of the groove 4 of the utility model is greater than the thickness of the protrusion 5 .

[0051] In this embodiment, during the installation and use of the utility model, attention should be paid to the sealing of the valve joints to avoid leakage. The valve operation should be carried out in accordance with regulations to avoid excessive use or excessive opening to ensure the long-term stable operation of the valve. When cleaning or maintaining the valve, the power should be turned off or the valve control box should be closed to avoid unexpected situations. When the valve is out of use for a long time, the valve should be maintained and serviced to ensure the normal operation of the valve.

[0052] The utility model has the following beneficial effects:

[0053] Improve work efficiency: Butterfly valves with mechanical limiters can realize automatic control and automatically adjust parameters such as flow, pressure and temperature to improve production efficiency and product quality.

[0054] Reduce labor costs: Butterfly valves with mechanical limit can be automatically controlled, reducing labor costs and human operation errors and improving work efficiency.

[0055] Reduce environmental pollution: Butterfly valves with mechanical limiters can accurately control parameters such as flow, pressure and temperature, reducing material waste and environmental pollution.

[0056] Ensure equipment safety: The butterfly valve with mechanical limit adopts a mechanical limit structure, which can ensure that the maximum opening and closing range of the valve will not be exceeded during operation, thereby ensuring the safety of equipment and personnel.

[0057] Reduce energy consumption costs: Butterfly valves with mechanical limiters can achieve precise control, reduce material waste and energy consumption costs, and reduce production costs.

[0058] Improve production stability: ensure the stability of the production process, reduce production fluctuations and quality problems.

[0059] In summary, butterfly valves with mechanical limiters have beneficial effects such as improving work efficiency, reducing labor costs, reducing environmental pollution, ensuring equipment safety, reducing energy consumption costs and improving production stability. They can help enterprises improve production efficiency and product quality and reduce production costs.

[0060] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also make appropriate changes and modifications to the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.

Claims

1. A butterfly valve with mechanical limit, comprising a valve and a valve stem, characterized in that: The valve is provided with a bottom cover, a groove is provided in the bottom cover, and a convex block is provided on the valve stem; The groove of the valve is adapted to the limiting step of the valve stem; the bottom cover and the valve seat of the valve are connected through the valve stem, and the protrusion of the valve stem is provided with a first limiting surface and a second limiting surface, and the angle between the first limiting surface and the second limiting surface is 120° to 135°; the length of the first limiting surface is the same as the radius of the valve stem, and the length of the second limiting surface is the same as the radius of the valve stem.

2. A butterfly valve with mechanical limit according to claim 1, characterized in that: The straight line where the spatial plane where the first limit surface is located intersects with the spatial plane where the second limit surface is located coincides with the axis of the valve stem.

3. A butterfly valve with mechanical limit according to claim 1, characterized in that: The depth of the groove is greater than the thickness of the bump.

4. A butterfly valve with mechanical limit according to claim 1, characterized in that: The groove is provided with a third limiting surface and a fourth limiting surface, and the included angle between the third limiting surface and the fourth limiting surface is 225° to 240°.

5. A butterfly valve with mechanical limit according to claim 1, characterized in that: The cross section of the bottom cover is circular.

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