Full-sealed gate valve

Abstract

The fully enclosed gate valve has a gate assembly with a support plate, a left slide plate, a right slide plate and a spring. The left slide plate and the right slide plate are matched in the mounting hole of the support plate. The spring is arranged between the left slide plate and the right slide plate. The left valve seat has a left baffle plate, the right valve seat has a right baffle plate, and the left baffle plate and the right baffle plate are between the left baffle plate and the right baffle plate. The left plane of the left slide plate is against the right plane of the left baffle plate, and the right plane of the right slide plate is against the left plane of the right baffle plate. The right plane of the left baffle plate and the left plane of the right baffle plate have a blocking part for blocking the two ports of the gate flow channel. The gate assembly with a new structure cooperates with the left valve seat and the right valve seat to block the solid particle impurities in the medium and prevent the solid particle impurities in the medium from entering the valve cavity, thereby overcoming the defect that the solid particle impurities enter the valve cavity and gather to affect the normal opening and closing of the gate. The spring opens the left and right slide plates to avoid the contact and cooperation between them being affected by temperature changes, thereby overcoming the defect that the sealing effect is deteriorated due to poor contact.

Description

Technical Field

[0001] The present invention relates to the field of valves, and particularly to gate valves. Background Art

[0002] During the use of gate valves, especially when the medium contains particulate matter, it is extremely easy for the particulate matter in the flow channel to enter the valve cavity. In the process of the particulate matter entering the valve cavity, it not only affects the service life of the gate plate of the gate valve but also affects its surface finish. For example, the high-temperature slurry of the vapor-liquid-solid three-phase mixed medium contains catalyst solid particles. The solid particle impurities enter the valve cavity, and then after the opening and closing extrusion of the gate plate, more and more solid particle impurities (such as coke powder) accumulate in the valve cavity, affecting the normal opening and closing of the gate plate, and even coking, resulting in the inability of the gate plate to open and close in place. Summary of the Invention

[0003] In view of the technical problems existing in the background art, the technical problem to be solved by the present invention is to provide a fully sealed gate valve that can prevent solid particle impurities from entering the valve cavity.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: a fully enclosed gate valve, including a valve body, a valve cover, a valve stem, a left valve seat, a right valve seat, and a gate plate assembly. The valve body is connected to the valve cover. The valve body has a main flow channel. The left valve seat and the right valve seat are arranged in the valve body. The valve cavity of the valve body is located on the upper and lower sides of the main flow channel. The left valve seat has a left valve hole corresponding to the main flow channel, and the right valve seat has a right valve hole corresponding to the main flow channel. It is characterized in that: the gate plate assembly includes a support plate, a left slide plate, a right slide plate, and a spring. The support plate is connected to the valve stem. The support plate has a mounting hole. The left slide plate and the right slide plate are matched in the mounting hole. The spring is arranged between the left slide plate and the right slide plate. The left slide plate has a left flow channel hole and a left blocking portion. The left blocking portion is located below the left flow channel hole. The right slide plate has a right flow channel hole and a right blocking portion. The right blocking portion is located below the right flow channel hole. The left flow channel hole and the right flow channel hole are opposite to each other left and right to form a gate plate flow channel. The left blocking portion and the right blocking portion are opposite to each other left and right. A retaining ring is also provided in the gate plate flow channel, and the retaining ring is located between the left flow channel hole and the right flow channel hole; the left valve seat has a left baffle plate extending from the left valve hole to the valve cavity, and the right valve seat has a right baffle plate extending from the right valve hole to the valve cavity. The space between the left baffle plate and the right baffle plate is the moving channel for the gate plate assembly. The left side plane of the left slide plate abuts against the right side plane of the left baffle plate, and the right side plane of the right slide plate abuts against the left side plane of the right baffle plate. The right side plane of the left baffle plate and the left side plane of the right baffle plate have blocking portions that cooperate to block both ends of the gate plate flow channel.

[0005] The mounting hole on the support plate is a stepped hole. The edges of the left slide plate and the right slide plate respectively have steps that match the stepped hole.

[0006] The left slide plate or / and the right slide plate has a spring groove, and the spring is arranged in the spring groove.

[0007] A first concave step ring is provided at the right port of the left flow channel hole of the left slide plate, and a second concave step ring is provided at the left port of the right flow channel hole of the right slide plate. The first concave step ring and the second concave step ring form an installation groove, and the retaining ring is arranged in the installation groove.

[0008] The range of the gate plate assembly moving channel is smaller than the contour ranges of the left baffle and the right baffle.

[0009] During the closing process of the gate plate flow channel, it moves within the range of the shielding part, and the shielding part extends from the edge of the left valve hole and the edge of the right valve hole towards the valve cavity respectively.

[0010] The left side plane of the left slide plate is in sliding seal cooperation with the right side plane of the left baffle, and the right side plane of the right slide plate is in sliding seal cooperation against the left side plane of the right baffle.

[0011] The beneficial effects of the present invention are as follows: This fully sealed gate valve is designed with a gate plate assembly of a new structure cooperating with left and right valve seats of new structures, which can block solid particle impurities in the medium and prevent the solid particle impurities in the medium from entering the valve cavity, overcoming the defect that the accumulation of solid particle impurities entering the valve cavity affects the normal opening and closing of the gate plate. The medium retained in the gate plate flow channel is always blocked from both sides by the corresponding shielding part during the process from fully open to fully closed of the valve. Until the fully closed state, the medium in the gate plate flow channel will not enter the valve cavity, preventing the solid particle impurities in the retained medium from entering the valve cavity. In addition, the left and right slide plates are sandwiched in the moving channel of the gate plate assembly between the left and right baffles. The left and right slide plates are driven by the valve stem to slide, and the left and right slide plates are pushed apart by a spring to ensure that the left slide plate remains in contact and cooperation with the left baffle, and the right slide plate remains in contact and cooperation with the left baffle. The contact and cooperation are more closely fitted, avoiding the influence of temperature change on their contact and cooperation, overcoming the deficiency of poor sealing effect caused by poor contact. At the same time, the spring can also offset the expansion of the left and right slide plates to prevent jamming in the moving channel of the gate plate assembly; the mutual sliding friction between the left slide plate and the left baffle, and the mutual sliding friction between the right slide plate and the right baffle make their contact surfaces evenly ground during use, smoother, cleaner, and with better sealing performance.

[0012] During the process from fully open to fully closed of this fully sealed gate valve, the medium retained in the gate plate flow channel will be sealed between the left and right baffles after the left and right slide plates move. The medium retained in the gate plate flow channel will not leak and will not enter the valve cavity. The range of the gate plate assembly moving channel is smaller than the contour ranges of the left and right baffles, that is, the left and right slide plates slide within the contour ranges of the left and right baffles and are clamped and slid by the left and right baffles. The structural layout is more reasonable and stable, and the operation of the gate plate assembly is more stable. Description of the Drawings

[0013] The embodiments, related details and working principles of the present invention will be described below in conjunction with the accompanying drawings.

[0014] Figure 1 This is a schematic structural diagram of the fully open gate valve in the present invention. The actuator is omitted in other figures.

[0015] Figure 2 It is Figure 1 a side view of

[0016] Figure 3 This is a schematic structural diagram of the fully closed gate valve in the present invention.

[0017] Figure 4 It is Figure 3 a side view of

[0018] Figure 5 This is a schematic structural diagram of the half-open gate valve in the present invention. Specific Embodiments

[0019] Referring to the accompanying drawings, in this embodiment, the fully enclosed gate valve includes a valve body 1, a valve cover 2, a valve stem 3, a left valve seat 4, a right valve seat 5, and a gate plate assembly 6. The valve body is connected to the valve cover. There is a main flow channel 7 inside the valve body 1. The left valve seat and the right valve seat are arranged inside the valve body. The valve cavity of the valve body is located on the upper and lower sides of the main flow channel.

[0020] The left valve seat 4 has a left valve hole, and the left valve hole corresponds to the main flow channel. The right valve seat 5 has a right valve hole, and the right valve hole corresponds to the main flow channel. The main flow channel corresponds to the left valve hole and the right valve hole, and their center lines are aligned.

[0021] The gate plate assembly 6 includes a support plate 8, a left slide plate 9, a right slide plate 10, and a spring 11. The support plate 8 is connected to the valve stem 3. The support plate 8 has a mounting hole. The left slide plate 9 and the right slide plate 10 are matched and arranged in the mounting hole. The spring 11 is arranged between the left slide plate and the right slide plate, so that the left slide plate and the right slide plate can move up and down with the support plate 8, and the support plate can be driven by the valve stem 3 to move up and down. The operation of the valve stem can be driven by an actuator.

[0022] The left slide plate 9 has a left flow channel hole and a left blocking portion. The left blocking portion is located below the left flow channel hole. The right slide plate 10 has a right flow channel hole and a right blocking portion. The right blocking portion is located below the right flow channel hole. The left flow channel hole and the right flow channel hole are opposite to each other left and right to form a gate plate flow channel 12. The left blocking portion and the right blocking portion are opposite to each other left and right. A retaining ring 13 is also provided in the gate plate flow channel. The retaining ring 13 is located between the left flow channel hole and the right flow channel hole. The gate plate flow channel 12 allows the medium to pass through. The retaining ring 13 can block the solid particle impurities in the medium, preventing the solid particle impurities in the medium from entering the gap between the left slide plate 9 and the right slide plate 10, and avoiding the leakage of solid particle impurities from the gap.

[0023] The left valve seat 4 has a left baffle 41 which extends from the left valve hole into the valve cavity. The right valve seat 5 has a right baffle 51 which extends from the right valve hole into the valve cavity. Between the left baffle and the right baffle is the gate assembly moving channel 14. The gate assembly 6 will be arranged within the gate assembly moving channel 14. The structure of the gate assembly is clamped by the left baffle and the right baffle to keep the structure of the gate assembly from falling apart. The spring 11 is located between the left slide plate 9 and the right slide plate 10, and the spring can push open the left slide plate and the right slide plate. The left side plane of the left slide plate 9 leans against the right side plane of the left baffle 41 to make them in sliding seal fit; the right side plane of the right slide plate leans against the left side plane of the right baffle to make them in sliding seal fit. The left side plane of the left slide plate and the right side plane of the left baffle 41 are in sliding seal fit, and the right side plane of the right slide plate leans against the left side plane of the right baffle in sliding seal fit. The right side plane of the left baffle and the left side plane of the right baffle have shielding parts that cooperate to shield the two ports at both ends of the gate flow channel. The shielding parts on the right side plane of the left baffle and the left side plane of the right baffle cooperate to block the two ports at both ends of the gate flow channel. The medium retained in the gate flow channel is always shielded from both sides by the shielding parts during the process of the valve opening from fully open to fully closed until the fully closed state, and the medium in the gate flow channel will not enter the valve cavity, preventing the solid particle impurities in the retained medium from entering the valve cavity.

[0024] This fully sealed gate valve is designed with a gate assembly of a new structure cooperating with left and right valve seats of new structures, which can block the solid particle impurities in the medium and prevent the solid particle impurities in the medium from entering the valve cavity, overcoming the defect that the solid particle impurities enter the valve cavity and accumulate, affecting the normal opening and closing of the gate. In addition, the left and right slide plates are sandwiched in the gate assembly moving channel between the left and right baffles. The left and right slide plates are driven by the valve stem to slide. The spring pushes open the left and right slide plates to ensure that the left slide plate remains in contact fit with the left baffle and the right slide plate remains in contact fit with the left baffle. The contact fit is closer and more conforming, avoiding the influence of temperature change on their contact fit and overcoming the deficiency of poor sealing effect caused by poor contact. At the same time, the spring can also offset the expansion of the left and right slide plates to prevent them from getting stuck in the gate assembly moving channel; the mutual sliding friction between the left slide plate and the left baffle and the mutual sliding friction between the right slide plate and the right baffle make their contact surfaces evenly ground during use, becoming smoother, cleaner and having better sealing performance. During the process of this fully sealed gate valve opening from fully open to fully closed, the medium retained in the gate flow channel will be sealed between the left and right baffles after the left and right slide plates move, and the medium retained in the gate flow channel will not leak and will not enter the valve cavity.

[0025] For further optimization, the mounting holes on the support plate 8 are stepped holes. The edges of the left slide plate 9 and the right slide plate 10 respectively have steps, and the steps match the stepped holes. This facilitates the assembly of the left slide plate, the right slide plate and the support plate. In addition, the position of the left slide plate relative to the support plate can be guided left and right, and the position of the right slide plate relative to the support plate can be guided left and right.

[0026] For further optimization, the left slide plate or / and the right slide plate have spring grooves, and the spring 11 is arranged in the spring grooves, making the structure more stable.

[0027] For further optimization, a first concave step ring is provided at the right port of the left flow channel hole of the left slide plate, and a second concave step ring is provided at the left port of the right flow channel hole of the right slide plate. The first concave step ring and the second concave step ring form a mounting groove, and the retaining ring 13 is arranged in the mounting groove, which facilitates the installation of the retaining ring and does not affect the blocking of solid particle impurities in the medium by the retaining ring when the distance between the left slide plate and the right slide plate changes.

[0028] For further optimization, the range of the gate plate assembly moving channel 14 is smaller than the contour ranges of the left baffle 41 and the right baffle 51, so that the gate plate assembly can be wrapped by the left baffle and the right baffle for movement, which is more stable. That is, the left slide plate and the right slide plate slide within the contour ranges of the left baffle and the right baffle and are clamped and slid by the left baffle and the right baffle. The structural layout is more reasonable and stable, and the gate plate assembly operates more stably.

[0029] During the closing process of the gate flow channel, it moves within the range of the blocking part. That is, during the process of the gate flow channel of the gate plate assembly changing from fully open to fully closed, the gate flow channel will enter the range of the blocking part until it completely enters the blocking part and is blocked, sealing the retained medium in the gate flow channel to avoid leakage and preventing the solid particle impurities in the retained medium from entering the valve cavity. In addition, the blocking parts extend from the edges of the left valve hole and the right valve hole towards the valve cavity respectively. That is, the blocking part of the left baffle extends from the edge of the left valve hole towards the valve cavity, and the blocking part of the right baffle extends from the edge of the right valve hole towards the valve cavity.

Claims

1. Totally enclosed gate valve, comprising a valve body (1), a valve cover (2), a valve rod (3), a left valve seat (4), a right valve seat (5) and a gate plate assembly (6). The valve body (1) is connected to the valve cover (2). There is a main flow channel (7) inside the valve body (1). The left valve seat and the right valve seat are arranged inside the valve body. The valve cavity of the valve body is located on the upper and lower sides of the main flow channel. The left valve seat (4) has a left valve hole corresponding to the main flow channel. The right valve seat (5) has a right valve hole corresponding to the main flow channel. It is characterized in that: The gate plate assembly (6) includes a support plate (8), a left slide plate (9), a right slide plate (10) and a spring (11). The support plate (8) is connected to the valve rod (3). The support plate (8) has a mounting hole. The left slide plate (9) and the right slide plate (10) are fitted in the mounting hole. The spring (11) is arranged between the left slide plate (9) and the right slide plate (10). The left slide plate has a left flow channel hole and a left blocking portion (91). The left blocking portion is located below the left flow channel hole. The right slide plate has a right flow channel hole and a right blocking portion (101). The right blocking portion is located below the right flow channel hole. The left flow channel hole and the right flow channel hole are opposite left and right to form a gate plate flow channel (12). The left blocking portion and the right blocking portion are opposite left and right. A retaining ring (13) is also arranged in the gate plate flow channel (12). The retaining ring (13) is located between the left flow channel hole and the right flow channel hole; The left valve seat (4) has a left baffle plate (41). The left baffle plate extends from the left valve hole to the valve cavity. The right valve seat (5) has a right baffle plate (51). The right baffle plate extends from the right valve hole to the valve cavity. The space between the left baffle plate and the right baffle plate is a moving channel (14) for the gate plate assembly. The left side plane of the left slide plate abuts against the right side plane of the left baffle plate. The right side plane of the right slide plate abuts against the left side plane of the right baffle plate. The right side plane of the left baffle plate and the left side plane of the right baffle plate have blocking portions for cooperatively blocking the two ports of the gate plate flow channel; The right port of the left flow channel hole of the left slide plate is provided with a first concave step ring. The left port of the right flow channel hole of the right slide plate is provided with a second concave step ring. The first concave step ring and the second concave step ring form a mounting groove. The retaining ring is arranged in the mounting groove; During the closing process of the gate plate flow channel, it moves within the range of the blocking portion. The blocking portions extend from the edges of the left valve hole and the right valve hole towards the valve cavity respectively.

2. The fully enclosed gate valve according to claim 1, characterized in that: The mounting hole on the support plate is a stepped hole. The edges of the left slide plate and the right slide plate respectively have steps that match the stepped hole.

3. The fully enclosed gate valve according to claim 1, characterized in that: The left slide plate or / and the right slide plate has a spring groove. The spring is arranged in the spring groove.

4. The fully enclosed gate valve according to claim 1, characterized in that: The range of the moving channel of the gate plate assembly is smaller than the contour range of the left baffle plate and the right baffle plate.

5. The fully enclosed gate valve according to claim 1, characterized in that: The left side plane of the left slide plate is in sliding sealing fit with the right side plane of the left baffle plate. The right side plane of the right slide plate abuts against the left side plane of the right baffle plate in sliding sealing fit.

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