Leak-proof chemical pipeline gate valve

Abstract

The utility model discloses a leakproof chemical pipeline gate valve which comprises a valve body, a valve cover is connected to the valve body, a first channel and a second channel which are communicated with each other are arranged on the valve body, a valve rod is connected to the valve cover in a threaded mode, a rotating disc is connected to the upper end of the valve rod, the lower end of the valve rod extends into the valve body, and the extending end of the valve rod is connected with a sealing plug. The top of the first channel is provided with a boss matched with the sealing plug, the upper portion of the end, close to the first channel, of the second channel is provided with a notch, the top wall of the notch is in an arc shape, a groove communicated with the notch is formed in the valve body, a sealing plate is hinged into the notch, a spring is connected into the groove, and the lower end of the spring is connected with one side of the sealing plate. A stop block is arranged at the bottom of the second channel, the sealing plate is pulled to the position below the sealing plug through pulling force of the spring, the sealing plug descends to push the sealing plate to rotate downwards, the lower end of the sealing plate makes contact with the bottom wall of the first channel and abuts against the stop block, meanwhile, the sealing plug blocks the boss, and therefore the dual-sealing effect is achieved, and medium circulation is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a leakage-proof chemical pipeline gate valve. Background Art

[0002] The gate valve is a gate that can be used in chemical pipelines to control the flow of media. However, the current gate valve has the following problems: by rotating the valve stem, the valve stem drives the sealing plug to descend, and the two channels are closed through the sealing plug, that is, there is only one layer of sealing structure. If the sealing plug is damaged, the sealing effect will be unsatisfactory. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a leak-proof chemical pipeline gate valve to solve the problems mentioned in the above background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] A leak-proof chemical pipeline gate valve comprises a valve body, a valve cover is connected to the valve body, a first channel and a second channel are connected to each other on the valve body, the inner end of the first channel is located below the inner end of the second channel, a valve stem is threadedly connected to the valve cover, the upper end of the valve stem is connected to a turntable, the lower end of the valve stem extends into the valve body, and the extended end is connected to a sealing plug, a boss is provided at the top of the first channel and cooperates with the sealing plug, a notch is provided at the upper part of the second channel near one end of the first channel, the top wall of the notch is arc-shaped, a groove connected to the notch is provided in the valve body, a sealing plate is hinged in the notch, a spring is connected in the groove, the lower end of the spring is connected to one side of the sealing plate, a stopper is provided at the bottom of the second channel, the sealing plate is pulled to the bottom of the sealing plug by the pulling force of the spring, the sealing plug descends and pushes the sealing plate to rotate downward, so that the lower end of the sealing plate contacts the bottom wall of the first channel and rests on the stopper.

[0006] Preferably, one end of the sealing plate is connected to a rubber block matching the top wall of the notch, and the end face of the rubber block is arc-shaped and contacts the notch wall, and the periphery of the sealing plate is connected to a first sealing gasket, and when the sealing plate contacts the stopper, the first sealing gasket contacts the side wall of the second channel.

[0007] In the above technical solution, the rubber block is elastic and arc-shaped, the notch is also arc-shaped, and the rubber block contacts the notch wall. Therefore, when the sealing plate is rotated, the rubber block always contacts the notch wall. Through the action of the rubber block, the sealing plate and the notch are in a sealed state.

[0008] Preferably, hinge shafts are connected to both sides of the notch, pin holes are provided on both sides of the rubber block, sealing sleeves are provided in the pin holes, and the hinge shafts are inserted in the sealing sleeves.

[0009] According to the above technical solution, when the sealing plate rotates, the sealing sleeve can seal the hinge shaft and the pin hole, thereby playing a sealing role.

[0010] Preferably, the bottom surface of the sealing plug is provided with a circle of second sealing gasket cooperating with the boss.

[0011] According to the above technical solution, when the sealing plug contacts the boss, the second sealing gasket can seal the sealing plug and the boss.

[0012] Preferably, the bottom surface of the valve cover is provided with a circle of third sealing gasket which cooperates with the valve body.

[0013] The above technical solution can seal the valve cover and the valve body through the third sealing gasket.

[0014] Preferably, a circle of fourth sealing gasket is provided at the contact point between the valve cover and the valve stem.

[0015] The above technical solution can seal the valve stem and the valve cover through the fourth sealing gasket.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] Turn the turntable to drive the valve stem to move into the valve body. During the descent of the sealing plug, the sealing plate will be pushed so that the sealing plate closes the second channel. At the same time, the sealing plug is sealed on the boss, thereby achieving a double sealing effect to prevent leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram after the sealing plug contacts the boss;

[0020] Figure 3 is a schematic diagram of a sealing plate;

[0021] Figure 4 for Figure 2 A partial enlarged view of

[0022] Figure 5 It is a schematic diagram of the sealing plate closing the second channel;

[0023] In the figure: 1-valve body, 2-valve cover, 3-first channel, 4-second channel, 5-valve stem, 6-turntable, 7-sealing plug, 8-boss, 9-notch, 10-groove, 11-sealing plate, 12-spring, 13-stopper, 14-rubber block, 15-first sealing gasket, 16-hinge shaft, 17-pin hole, 18-sealing sleeve, 19-second sealing gasket, 20-third sealing gasket, 21-fourth sealing gasket. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1 and Figure 2 , a leak-proof chemical pipeline gate valve, comprising a valve body 1, a valve cover 2 connected to the valve body 1, a first channel 3 and a second channel 4 connected to each other are provided on the valve body 1, the inner end of the first channel 3 is located below the inner end of the second channel 4, a valve stem 5 is threadedly connected to the valve cover 2, a rotary disc 6 is connected to the upper end of the valve stem 5, the lower end of the valve stem 5 extends into the valve body 1, and a sealing plug 7 is connected to the extended end, and a boss 8 matching with the sealing plug 7 is provided on the top of the first channel 3. A circle of second sealing gaskets 19 matching with the boss is provided on the bottom surface of the sealing plug 7, a circle of third sealing gaskets 20 matching with the valve body is provided on the bottom surface of the valve cover 2, and a circle of fourth sealing gaskets 21 is provided at the contact point between the valve cover 2 and the valve stem. After the sealing plug 7 contacts with the boss 8, the sealing plug and the boss 8 can be sealed by the second sealing gasket 19; the valve cover 2 and the valve body 1 can be sealed by the third sealing gasket 20; and the valve stem 5 and the valve cover 2 can be sealed by the fourth sealing gasket 21.

[0026] A notch 9 is provided at the upper portion of the second channel 4 near one end of the first channel, and the top wall of the notch 9 is arc-shaped. A groove 10 connected to the notch is provided in the valve body 1, and a sealing plate 11 is hinged in the notch 9. A spring 12 is connected in the groove 10, and the lower end of the spring 12 is connected to one side of the sealing plate 11. A stopper 13 is provided at the bottom of the second channel 4, and the sealing plate 11 is pulled to the bottom of the sealing plug 7 by the pulling force of the spring 12. The sealing plug 7 descends to push the sealing plate 11 to rotate downward, so that the lower end of the sealing plate 11 contacts the bottom wall of the first channel 3 and rests on the stopper 13.

[0027] In this embodiment, one end of the sealing plate 11 is connected to a rubber block 14 that matches the top wall of the notch, and the end face of the rubber block 14 is arc-shaped and contacts the wall of the notch 9. The periphery of the sealing plate 11 is connected to a first sealing pad 15. When the sealing plate 11 contacts the stopper 13, the first sealing pad 15 contacts the side wall of the second channel 4. The two sides of the notch 9 are connected to a hinge shaft 16. The two sides of the rubber block 14 are provided with a pin hole 17. The pin hole 17 is provided with a sealing sleeve 18, and the hinge shaft 16 is inserted in the sealing sleeve 18. The rubber block 14 is elastic and arc-shaped. The notch 9 is also arc-shaped. The rubber block 14 contacts the wall of the notch 9. Therefore, when the sealing plate 11 is rotated, the rubber block 14 is always in contact with the wall of the notch 9. Through the action of the rubber block 14, the sealing plate 11 and the notch 9 are in a sealed state. When the sealing plate 11 rotates, through the action of the sealing sleeve 18, the hinge shaft 16 and the pin hole 17 can be sealed, thereby playing a sealing role.

[0028] The working principle of the utility model is as follows: rotating the turntable 6 drives the valve stem 5 to move into the valve body 1, and in the process of the sealing plug 7 descending, the sealing plate 11 is pushed, and the sealing plate 11 rotates downward until the sealing plate 11 abuts against the stopper 13 and closes the second channel 4. At the same time, the sealing plug 7 is blocked on the boss 8, thereby achieving a double sealing effect to prevent the medium from circulating. When the valve stem 5 is reversed, the sealing plug 7 moves upward, and the sealing plate 11 rebounds under the action of the spring 12 and returns to its original position and is located below the sealing plug 7.

[0029] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A leak-proof chemical pipeline gate valve, characterized by: The valve body (1) comprises a valve cover (2) connected to the valve body (1), a first channel (3) and a second channel (4) connected to each other are provided on the valve body (1), the inner end of the first channel (3) is located below the inner end of the second channel (4), a valve stem (5) is threadedly connected to the valve cover (2), the upper end of the valve stem (5) is connected to a rotating disk (6), the lower end of the valve stem (5) extends into the valve body (1), and the extended end is connected to a sealing plug (7), the top of the first channel (3) is provided with a boss (8) matched with the sealing plug (7), the upper part of the second channel (4) close to one end of the first channel is provided with a notch (9), and the notch The top wall of the valve body (9) is arc-shaped, a groove (10) connected to the notch is provided in the valve body (1), a sealing plate (11) is hinged in the notch (9), a spring (12) is connected in the groove (10), the lower end of the spring (12) is connected to one side of the sealing plate (11), a stopper (13) is provided at the bottom of the second channel (4), the sealing plate (11) is pulled to the bottom of the sealing plug (7) by the pulling force of the spring (12), the sealing plug (7) descends and pushes the sealing plate (11) to rotate downward, so that the lower end of the sealing plate (11) contacts the bottom wall of the first channel (3) and abuts against the stopper (13).

2. The anti-leakage chemical pipeline gate valve according to claim 1 is characterized by: One end of the sealing plate (11) is connected to a rubber block (14) matching the top wall of the notch, and the end face of the rubber block (14) is arc-shaped and contacts the wall of the notch (9). The periphery of the sealing plate (11) is connected to a first sealing pad (15). When the sealing plate (11) contacts the stopper (13), the first sealing pad (15) contacts the side wall of the second channel (4).

3. The anti-leakage chemical pipeline gate valve according to claim 2 is characterized by: The two sides of the notch (9) are connected with hinge shafts (16), the two sides of the rubber block (14) are provided with pin holes (17), the pin holes (17) are provided with sealing sleeves (18), and the hinge shaft (16) is inserted into the sealing sleeves (18).

4. The anti-leakage chemical pipeline gate valve according to claim 3 is characterized by: The bottom surface of the sealing plug (7) is provided with a circle of second sealing gasket (19) which cooperates with the boss.

5. The anti-leakage chemical pipeline gate valve according to claim 4 is characterized by: The bottom surface of the valve cover (2) is provided with a circle of third sealing gasket (20) which matches with the valve body.

6. The anti-leakage chemical pipeline gate valve according to claim 5, characterized in that: A circle of fourth sealing gasket (21) is provided at the contact point between the valve cover (2) and the valve stem.

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