Safety gate valve

Abstract

The utility model relates to the technical field of valves, and discloses a safety gate valve which comprises a valve body and a valve cover fixedly installed at the top end of the valve body through a bolt structure, a supporting frame playing a supporting role is fixedly arranged on the top end face of the valve cover, and the telescopic end of an electric telescopic mechanism is fixedly connected with a valve rod. The end, away from the electric telescopic mechanism, of the valve rod is fixedly connected with a valve plate assembly arranged in the valve body, and the valve plate assembly comprises a valve head fixedly connected to one end of the valve rod. A mounting block is fixedly arranged in the valve body, the valve plate assembly further comprises a first gate plate and a second gate plate which are arranged on the outer side of the valve head, and a limiting groove is formed in the bottom end face of the inner side of the valve body. According to the safety gate valve, the first gate plate and the second gate plate are rotationally connected to the two sides of the valve head, when the valve plate assembly stretches into the inner side of the limiting groove body, the first gate plate and the second gate plate can make close contact with the limiting groove body through the elastic force of the spring, and the contact sealing performance of the sealing face of the gate valve is improved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically a safety gate valve. Background Technology

[0002] Valves are control components in fluid transport systems, with functions such as shut-off, regulation, flow guidance, backflow prevention, pressure stabilization, flow diversion, or overflow pressure relief. Gate valves are a commonly used type of valve. Gate valves can generally only be fully open or fully closed, and cannot be used for regulation or throttling.

[0003] In the prior art, gate valves generally include a gate as the opening and closing element. The gate moves in a direction perpendicular to the fluid direction. The gate has two sealing surfaces. When the gate valve is closed, the sealing surfaces can be sealed by the medium pressure alone. That is, the sealing surfaces are sealed by the medium pressure alone, which presses the sealing surfaces of the gate against the valve seat on the other side. This is called self-sealing.

[0004] However, when existing gate valves seal using fluid pressure, changes in flow rate can lead to varying fluid pressures, which can reduce the sealing effect and make it difficult to guarantee the sealing surface. This results in certain defects in their use. Therefore, we propose a safety gate valve to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide a safety gate valve to solve the problem mentioned in the background art that when existing gate valves seal by fluid pressure, changes in flow rate and fluid pressure can easily lead to a reduction in sealing effect and make it difficult to guarantee the sealing performance of the sealing surface.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a safety gate valve, comprising a valve body and a valve cover fixedly mounted on the top of the valve body by bolts, wherein a support frame is fixedly provided on the top surface of the valve cover to provide support, and an electric telescopic mechanism is fixedly mounted on the top of the support frame, wherein a valve stem is fixedly connected to the telescopic end of the electric telescopic mechanism, and a valve plate assembly disposed inside the valve body is fixedly connected to the end of the valve stem away from the electric telescopic mechanism, and the valve plate assembly includes a valve head fixedly connected to one end of the valve stem;

[0007] An installation block is fixedly installed inside the valve body, and a sealing gasket is fixedly installed on the end face of the installation block near the valve stem. The valve plate assembly also includes a first gate plate and a second gate plate disposed on the outside of the valve head. A limit groove is formed on the bottom inner end face of the valve body.

[0008] As a preferred technical solution of this utility model, the first gate and the second gate are symmetrically distributed on both sides of the valve head. A first connecting member is fixedly provided on the outer end face of the first gate near the valve head, and the first connecting member is rotatably connected to the outer end of the valve head.

[0009] As a preferred technical solution of this utility model, a second connecting member is fixedly provided on the outer end face of the second gate near the valve head, and the second connecting member is rotatably connected to the outer end of the valve head.

[0010] As a preferred embodiment of this utility model, a spring is provided on one side of the valve head, and the two ends of the spring are fixedly connected to the first gate and the second gate, respectively.

[0011] As a preferred technical solution of this utility model, the vertical cross section of the limiting groove in the Y direction is set in a "V" shape, and the bottom ends of the first gate and the second gate are slidably connected to the valve body through the limiting groove.

[0012] As a preferred embodiment of this utility model, the bottom of the limiting groove is provided with a groove structure, and the two end faces of the groove structure are inclined. The inner surface of the sealing gasket is inclined, and the inclination of the groove structure is consistent with the inclination of the inner surface of the sealing gasket.

[0013] As a preferred embodiment of this utility model, the top surface of the valve cover is provided with a receiving cavity, and the inside of the receiving cavity is filled with flexible graphite packing.

[0014] As a preferred technical solution of this utility model, a packing sleeve is provided on the top surface of the valve cover, and a packing pressure plate is connected to the top surface of the packing sleeve. The packing pressure plate is fixedly connected to the valve cover by a bolt structure and plays a limiting role in the packing sleeve.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the safety gate valve is rotatably connected to both sides of the valve head by the first gate plate and the second gate plate. When the valve plate assembly extends into the inner side of the limiting groove, the elastic force of the spring can make the first gate plate and the second gate plate make tight contact with the limiting groove, thereby improving the contact sealing performance of the sealing surface.

[0016] 1. The valve stem is driven to move downward inside the valve body by an electric telescopic mechanism, thereby causing the valve plate assembly to extend into the inner side of the limiting groove to seal and isolate the fluid passage inside the valve body. Since the cross-section of the limiting groove is set in a "V" shape, and the bottom ends of the first gate and the second gate are slidably connected to the valve body through the limiting groove, when the first gate and the second gate come into contact with the limiting groove during the downward movement, the first gate and the second gate are restricted by the limiting groove, rotate relative to the valve head, tilt, and compress the spring at the same time.

[0017] Furthermore, a groove structure is provided at the bottom of the limiting groove, and the slope of the groove structure is consistent with the inclination of the inner surface of the mounting block. When the bottom ends of the first gate and the second gate contact the groove structure at the bottom of the limiting groove, the first gate and the second gate are limited by the groove structure and open at a certain angle. At this time, the outer surfaces of the first gate and the second gate are in close contact with the sealing gasket. At the same time, the elastic force of the spring can make the first gate and the second gate fit tightly with the groove structure at the bottom of the limiting groove, thereby sealing and isolating the fluid passage inside the valve body.

[0018] 2. A receiving cavity is provided on the top surface of the valve cover, and the cavity is filled with flexible graphite packing. The flexible graphite packing can seal the contact area between the valve stem and the valve cover. At the same time, a packing sleeve is provided on the top surface of the valve cover, and a packing pressure plate is connected to the top surface of the packing sleeve. The packing pressure plate is fixed to the valve cover by bolts. The packing pressure plate can fix the packing sleeve to the top of the valve cover, thereby limiting and pressing the flexible graphite packing inside the receiving cavity. By removing the packing pressure plate, the packing sleeve can be removed and the flexible graphite packing inside the receiving cavity can be disassembled and replaced. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the valve body and valve cover in cross-section of this utility model;

[0021] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0022] Figure 4 This is a partial cross-sectional view of the valve plate assembly and the limiting groove in the separated state of this utility model;

[0023] Figure 5 This utility model Figure 4 Enlarged structural diagram at point B.

[0024] In the diagram: 1. Valve body; 2. Valve cover; 3. Support frame; 4. Electric telescopic mechanism; 5. Valve stem; 6. Mounting block; 7. Sealing gasket block; 800. Valve plate assembly; 801. Valve head; 802. First connecting piece; 803. Second connecting piece; 804. First gate; 805. Second gate; 806. Spring; 9. Limiting groove; 10. Receiving cavity; 11. Packing sleeve; 12. Packing pressure plate. Detailed Implementation

[0025] 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.

[0026] Please see Figure 1-5 This utility model provides a technical solution: a safety gate valve, comprising a valve body 1 and a valve cover 2 fixedly mounted on the top of the valve body 1 by bolts. A support frame 3 is fixedly mounted on the top surface of the valve cover 2, and an electric telescopic mechanism 4 is fixedly mounted on the top of the support frame 3. The support frame 3 provides fixed support for the valve cover 2 and the electric telescopic mechanism 4. Figure 1 and Figure 2 As shown, the telescopic end of the electric telescopic mechanism 4 is fixedly connected to the valve stem 5, and the end of the valve stem 5 away from the electric telescopic mechanism 4 is fixedly connected to the valve plate assembly 800 disposed inside the valve body 1. The electric telescopic mechanism 4 can drive the valve stem 5 to rise and fall inside the valve body 1 and the valve cover 2, thereby driving the valve plate assembly 800 to move up and down inside the valve body 1 and open and close the fluid passage in the valve body 1.

[0027] Specific examples Figure 2 As shown, the valve plate assembly 800 includes a valve head 801 fixedly connected to one end of the valve stem 5, and the valve plate assembly 800 also includes a first gate 804 and a second gate 805 disposed on the outside of the valve head 801, and the first gate 804 and the second gate 805 are symmetrically distributed on both sides of the valve head 801. Figure 4 and Figure 5 As shown, a first connector 802 is fixedly provided on the outer end face of the first gate 804 near the valve head 801, and the first connector 802 is rotatably connected to the outer end of the valve head 801. A second connector 803 is fixedly provided on the outer end face of the second gate 805 near the valve head 801, and the second connector 803 is rotatably connected to the outer end of the valve head 801. By providing the first connector 802 and the second connector 803, the first gate 804 and the second gate 805 can rotate relative to the valve head 801.

[0028] Furthermore, a spring 806 is provided on one side of the valve head 801, and the two ends of the spring 806 are fixedly connected to the first gate 804 and the second gate 805 respectively, in combination with... Figure 2 and Figure 4As shown, the vertical cross section of the limiting groove 9 in the Y direction is set in a "V" shape, and the bottom ends of the first gate 804 and the second gate 805 are slidably connected to the valve body 1 through the limiting groove 9. When the first gate 804 and the second gate 805 come into contact with the limiting groove 9 during the downward movement, the first gate 804 and the second gate 805 are restricted by the limiting groove 9, and rotate relative to the valve head 801 to tilt and compress the spring 806 at the same time.

[0029] Furthermore, a mounting block 6 is fixedly installed inside the valve body 1, and a sealing gasket 7 is fixedly installed on the end face of the mounting block 6 near the valve stem 5. Simultaneously, a limiting groove 9 is formed on the inner bottom end face of the valve body 1, specifically as follows... Figure 2 and Figure 4 As shown, due to the inclined inner surface of the sealing gasket 7, and the bottom of the limiting groove 9 is provided with a groove structure, and the two end faces of the groove structure are inclined, the inclination of the groove structure is consistent with the inclination of the inner surface of the sealing gasket 7. When the bottom ends of the first gate 804 and the second gate 805 contact the groove structure at the bottom of the limiting groove 9, the first gate 804 and the second gate 805 are limited by the groove structure and open at a certain angle. At the same time, the outer surfaces of the first gate 804 and the second gate 805 are pressed against the sealing gasket 7, thereby isolating the fluid passage inside the valve body 1.

[0030] Specific examples Figure 2 and Figure 3 As shown, the top surface of the valve cover 2 has a receiving cavity 10, and the inside of the receiving cavity 10 is filled with flexible graphite packing. The flexible graphite packing seals the contact area between the valve stem 5 and the valve cover 2. At the same time, the top surface of the valve cover 2 is provided with a packing sleeve 11, and the top surface of the packing sleeve 11 is connected to a packing pressure plate 12. The packing pressure plate 12 is fixedly connected to the valve cover 2 by bolts. The packing pressure plate 12 can fix the packing sleeve 11 to the top of the valve cover 2, and the packing sleeve 11 can limit and compress the flexible graphite packing inside the receiving cavity 10.

[0031] The working principle of this utility model is as follows: When using this safety gate valve, the fluid passage inside the valve body 1 can first be isolated through the valve plate assembly 800, specifically as follows: Figure 1 and Figure 4 As shown, when the fluid passage inside the valve body 1 is in the open and flowable state, the valve plate assembly 800 is located above the limiting groove 9. At this time, the first gate 804 and the second gate 805 are parallel to the valve stem 5 under the action of the elastic force of the spring 806.

[0032] Specific examples Figure 2As shown, when the fluid passage inside the valve body 1 is isolated, the valve stem 5 is driven to move downward inside the valve body 1 by the electric telescopic mechanism 4, thereby causing the valve plate assembly 800 to extend into the inner side of the limiting groove 9. Since the cross section of the limiting groove 9 is set in a "V" shape, and the bottom ends of the first gate 804 and the second gate 805 are slidably connected to the valve body 1 through the limiting groove 9, when the first gate 804 and the second gate 805 contact the limiting groove 9 during the downward movement, the first gate 804 and the second gate 805 are restricted by the limiting groove 9, rotate relative to the valve head 801 to tilt and compress the spring 806 at the same time.

[0033] Furthermore, a groove structure is provided at the bottom of the limiting groove 9, and the inclination of the groove structure is consistent with the inclination of the inner surface of the sealing gasket 7. When the bottom ends of the first gate 804 and the second gate 805 contact the groove structure at the bottom of the limiting groove 9, the first gate 804 and the second gate 805 are limited by the groove structure and open at a certain angle. At this time, the outer surfaces of the first gate 804 and the second gate 805 are tightly attached to the inner surface of the sealing gasket 7. At the same time, the elastic force of the spring 806 can make the first gate 804 and the second gate 805 fit tightly with the groove structure at the bottom of the limiting groove 9, thereby isolating the fluid passage inside the valve body 1.

[0034] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A safety gate valve, comprising a valve body (1) and a valve cover (2) fixedly mounted on the top of the valve body (1) by bolts, wherein a support frame (3) is fixedly provided on the top surface of the valve cover (2) to provide support, and an electric telescopic mechanism (4) is fixedly mounted on the top of the support frame (3), characterized in that: The telescopic end of the electric telescopic mechanism (4) is fixedly connected to a valve stem (5), and the end of the valve stem (5) away from the electric telescopic mechanism (4) is fixedly connected to a valve plate assembly (800) disposed inside the valve body (1), and the valve plate assembly (800) includes a valve head (801) fixedly connected to one end of the valve stem (5). The valve body (1) is fixedly provided with an installation block (6), and a sealing gasket (7) is fixedly provided on the side end face of the installation block (6) near the valve stem (5). The valve plate assembly (800) also includes a first gate plate (804) and a second gate plate (805) provided on the outside of the valve head (801). A limit groove (9) is opened on the inner bottom end face of the valve body (1).

2. A safety gate valve according to claim 1, characterized in that: The first gate (804) and the second gate (805) are symmetrically distributed on both sides of the valve head (801). The first gate (804) is fixedly provided with a first connector (802) on the outer end face of the side close to the valve head (801), and the first connector (802) is rotatably connected to the outer end of the valve head (801).

3. A safety gate valve according to claim 2, characterized in that: The second gate (805) is fixedly provided with a second connector (803) on the outer end face of the side near the valve head (801), and the second connector (803) is rotatably connected to the outer end of the valve head (801).

4. A safety gate valve according to claim 3, characterized in that: A spring (806) is provided on one side of the valve head (801), and the two ends of the spring (806) are fixedly connected to the first gate (804) and the second gate (805) respectively.

5. A safety gate valve according to claim 4, characterized in that: The vertical cross section of the limiting groove (9) in the Y direction is set in a "V" shape, and the bottom ends of the first gate (804) and the second gate (805) are slidably connected to the valve body (1) through the limiting groove (9).

6. A safety gate valve according to claim 5, characterized in that: The bottom of the limiting groove (9) is provided with a groove structure, and the two end faces of the groove structure are inclined. The inner surface of the sealing pad (7) is inclined, and the inclination of the groove structure is consistent with the inclination of the inner surface of the sealing pad (7).

7. A safety gate valve according to claim 1 or 6, characterized in that: The valve cover (2) has a receiving cavity (10) on its top surface, and the receiving cavity (10) is filled with flexible graphite filler.

8. A safety gate valve according to claim 7, characterized in that: The valve cover (2) is provided with a packing sleeve (11) on its top surface, and a packing pressure plate (12) is connected to the top surface of the packing sleeve (11). The packing pressure plate (12) is fixedly connected to the valve cover (2) by bolt structure and plays a limiting role on the packing sleeve (11).

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