A new zero leakage poppet valve

Abstract

The utility model relates to valve technical field, and disclose a novel zero leakage poppet valve, including valve body, actuating mechanism, valve rod, valve plate and valve seat, the valve seat is annular and is welded to install below the inner wall of valve body, the top of valve seat is equipped with first ring groove, first sealing washer clamping slot and second sealing washer clamping slot, the inner wall fixed embedding of first sealing washer clamping slot has first sealing washer, the inner wall fixed embedding of second sealing washer clamping slot has second sealing washer, the top of first sealing washer and first sealing washer is located above valve seat, first ring groove is located between first sealing washer clamping slot and second sealing washer clamping slot, one side of valve seat is equipped with gas guide hole. The utility model discloses valve body simple structure, low processing cost, and easy to maintain, and the air seal structure provided occupies small space, is not easy to block, and the reliability is high, can effectively avoid the leakage caused by sealing washer failure, can realize zero leakage seal.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically to a novel zero-leakage lifting valve. Background Technology

[0002] As directional valves, lift valves are widely used in VOCs exhaust gas treatment devices, such as RTO and RCO units, to control the inflow and outflow of airflow and switching. The sealing performance of the lift valve is one of the key factors affecting whether the exhaust gas emissions after VOCs exhaust gas treatment meet standards. Currently, an increasing number of VOCs exhaust gas treatment projects require lift valves to meet zero leakage requirements. During the operation of VOCs exhaust gas treatment devices, the lift valve needs to perform frequent opening and closing actions, and the gas passing through the valve body often contains high temperatures and dust. The currently used static sealing method, which relies solely on the force of the cylinder to press the valve plate and sealing strip together, is unreliable. During operation, localized failure of the sealing surface can easily occur, leading to leakage. Patent CN203516788U proposes a gas-tight lift valve structure that achieves zero leakage by filling the sealed space between two valve plates with pure gas. However, this structure occupies a large internal space of the valve body, and its overly complex structure increases maintenance and manufacturing costs. Patent CN213744926U proposes a gas-tight structure that sets an air passage on the sealing ring and fills it with pure gas. In this structure, the air passage on the sealing ring is too narrow, making it easy to be squeezed and damaged or blocked by dust, thus reducing the sealing effect. Therefore, to address the problems existing in the lift valves of current VOCs exhaust gas treatment devices, there is an urgent need to develop a zero-leakage lift valve structure that is simple in structure, reliable in sealing, not easily damaged, easy to maintain, and low in cost. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a novel zero-leakage lifting valve to solve the problems existing in the background art.

[0004] This utility model provides the following technical solution: A novel zero-leakage lifting valve includes a valve body, an actuator, a valve stem, a valve plate, and a valve seat. The valve seat is annular and welded to the lower part of the inner wall of the valve body. The top of the valve seat has a first annular groove, a first sealing ring groove, and a second sealing ring groove. The inner wall of the first sealing ring groove is fixedly fitted with a first sealing ring, and the inner wall of the second sealing ring groove is fixedly fitted with a second sealing ring. The tops of the first sealing ring and the first sealing ring are located above the valve seat. The first annular groove is located between the first sealing ring groove and the second sealing ring groove. A vent hole is provided on one side of the valve seat. One end of the vent hole communicates with the interior of the first annular groove. A vent pipe is fixedly connected to the lower part of one side of the valve body. One end of the vent pipe is fixedly connected to one side of the valve seat and communicates with the interior of the vent hole. The other end of the vent pipe extends to the outside of the valve body and is connected to an external compressed gas source.

[0005] Furthermore, the bottom end of the valve stem is fixedly installed in the middle of the inner wall of the valve plate, and the top end of the valve stem extends to the top of the valve body and is fixedly installed at the actuating end of the actuator.

[0006] Furthermore, the valve plate is located above the valve seat, and a second annular groove is formed at the bottom of the valve plate. The second annular groove is located above the first sealing ring and the second sealing ring. The actuator drives the valve plate to press against the first sealing ring and the second sealing ring to form an annular cavity through the valve stem.

[0007] Furthermore, the first and second sealing rings are made of rubber, and the sealing surfaces have protruding lips on both sides, which fit against the valve plate surface when the valve is closed.

[0008] Furthermore, the air guide pipe introduces external compressed gas to fill the annular cavity, and the pressure of the compressed gas is greater than the pressure of the gas on both sides of the valve plate inside the valve body.

[0009] The technical effects and advantages of this utility model are as follows: 1. The valve body structure of this utility model is simple, has low processing cost, and is easy to maintain. The provided air-tight structure occupies little space, is not easy to clog, and has high reliability. It can effectively avoid leakage caused by the failure of the sealing ring and achieve zero leakage sealing. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of a novel zero-leakage lift valve proposed in this utility model; Figure 2 This is a partial schematic diagram of the sealing pair when a novel zero-leakage lift valve is closed, as proposed in this utility model. Figure 3 This is a cross-sectional view of the valve seat of a novel zero-leakage lift valve proposed in this utility model; Figure 4 This is a cross-sectional view of the sealing ring of a novel zero-leakage lift valve proposed in this utility model.

[0011] The attached figures are labeled as follows: 1. Valve body; 2. Actuator; 3. Valve stem; 4. Valve plate; 4-1. Second annular groove; 5. Valve seat; 5-1. First annular groove; 5-2. First sealing ring groove; 5-3. Second sealing ring groove; 5-4. Air guide hole; 6-1. First sealing ring; 6-2. Second sealing ring; 6-3. Lip; 7. Air guide pipe; 8. Annular cavity. Detailed Implementation

[0012] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The novel zero-leakage lifting valve involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0013] Example 1: like Figure 1-4 As shown, a novel zero-leakage lifting valve includes a valve body 1, an actuator 2, a valve stem 3, a valve plate 4, and a valve seat 5. The valve seat 5 is annular and welded to the lower part of the inner wall of the valve body 1. The valve plate 4 is located above the valve seat 5. The bottom end of the valve stem 3 is fixedly installed in the middle of the inner wall of the valve plate 4, and the top end of the valve stem 3 extends to the top of the valve body 1 and is fixedly installed at the actuating end of the actuator 2. The actuator 2 is a cylinder. One end of the valve stem 3 is connected to the cylinder rod head through a floating joint, and the other end is fastened to the valve plate 4. The cylinder drives the valve plate 4 to move up and down through the valve stem 3 to realize the opening and closing of the valve. The valve seat 5 has a first annular groove 5-1, a first sealing ring groove 5-2, and a second sealing ring groove 5-3 on its top. A first sealing ring 6-1 is fixedly embedded in the inner wall of the first sealing ring groove 5-2, and a second sealing ring 6-2 is fixedly embedded in the inner wall of the second sealing ring groove 5-3. The tops of the first sealing ring 6-1 and the second sealing ring groove 6-2 are located above the valve seat 5. The first annular groove 5-1 is located between the first sealing ring groove 5-2 and the second sealing ring groove 5-3. A vent hole 5-4 is provided on one side of the valve seat 5. One end of the air guide hole 5-4 is connected to the interior of the first annular groove 5-1. An air guide pipe 7 is fixedly connected to the lower side of one side of the valve body 1. One end of the air guide pipe 7 is fixedly connected to one side of the valve seat 5 and is connected to the interior of the air guide hole 5-4. The other end of the air guide pipe 7 extends to the outside of the valve body 1 and is connected to an external compressed gas source. The compressed gas is air. The air guide pipe 7 introduces external compressed gas to fill the annular cavity 8. The pressure of the compressed gas is greater than the pressure of the gas on both sides of the valve plate 4 inside the valve body 1, and will not pollute the gas flowing through the valve. The bottom of the valve plate 4 is provided with a second annular groove 4-1. The second annular groove 4-1 is located above the first sealing ring 6-1 and the second sealing ring 6-2. The function of the second annular groove 4-1 is to keep the compressed gas passing through when the first annular groove 5-1 is partially blocked. The actuator 2 drives the valve plate 4 to press against the first sealing ring 6-1 and the second sealing ring 6-2 through the valve stem 3 to form an annular cavity 8. The first sealing ring 6-1 and the second sealing ring 6-2 are made of rubber material, specifically fluororubber. The sealing surfaces are provided with protruding lips 6-3 on both sides. When the valve is closed, the lips 6-3 are in contact with the surface of the valve plate 4 to form an auxiliary seal. The compressed gas in the annular cavity, under the action of the internal and external pressure difference, causes the lips 6-3 to press against the surface of the valve plate, forming a self-sealing effect.

[0014] In summary, as Figure 1-4 As shown, this novel zero-leakage lift valve, when the valve is closed, the actuator 2, i.e., the cylinder, drives the valve plate 4 to press against the first sealing ring 6-1 and the second sealing ring 6-2 through the valve stem 3. At this time, the valve plate 4, valve seat 5, first sealing ring 6-1, second sealing ring 6-2, first annular groove 5-1, and second annular groove 4-1 form an annular cavity 8. Compressed gas enters the annular cavity 8 through the air guide pipe 7 and the air guide hole 5-4. Since the pressure of the compressed gas is greater than the pressure of the gas on both sides of the valve plate 4 in the valve body 1, the gas on both sides cannot penetrate through the first sealing ring 6-1 and the second sealing ring 6-2. If the first sealing ring 6-1 and the second sealing ring 6-2 fail, the compressed gas in the annular cavity 8 flows into the space of the valve body 1 from the gap where the seal fails under the pressure difference, avoiding contaminated gas from passing through the valve plate 4, thereby achieving zero leakage of the valve.

[0015] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The installation methods between equipment are also the same as conventional installation methods in the prior art. For example, the connection position of valve components is provided with anti-leakage rubber strips, the outside of threaded rods or lead rods is provided with dust covers, and the equipment can be driven by either built-in batteries or external power supply. The control method is automatic control by a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, this utility model will not explain the control method and circuit connection in detail. The controller can be an external controller or installed in a position that does not affect the use of this device. The controller can play a control role for the electrical components mentioned in this document, and the controller is a conventional known device.

[0016] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 novel zero-leakage lifting valve, comprising a valve body (1), an actuator (2), a valve stem (3), a valve plate (4), and a valve seat (5), characterized in that, The valve seat (5) is annular and welded to the lower part of the inner wall of the valve body (1). The top of the valve seat (5) has a first annular groove (5-1), a first sealing ring groove (5-2), and a second sealing ring groove (5-3). A first sealing ring (6-1) is fixedly embedded in the inner wall of the first sealing ring groove (5-2), and a second sealing ring (6-2) is fixedly embedded in the inner wall of the second sealing ring groove (5-3). The tops of the first sealing ring (6-1) and the first sealing ring (6-1) are located above the valve seat (5). The first annular groove (5-1)... 5-1) Located between the first sealing ring groove (5-2) and the second sealing ring groove (5-3), the valve seat (5) has an air guide hole (5-4) on one side. One end of the air guide hole (5-4) is connected to the inside of the first ring groove (5-1). An air guide pipe (7) is fixedly connected to the lower side of the inside of the valve body (1). One end of the air guide pipe (7) is fixedly connected to the side of the valve seat (5) and is connected to the inside of the air guide hole (5-4). The other end of the air guide pipe (7) extends to the outside of the valve body (1) and is connected to an external compressed gas source.

2. The novel zero-leakage lifting valve according to claim 1, characterized in that: The bottom end of the valve stem (3) is fixedly installed in the middle of the inner wall of the valve plate (4), and the top end of the valve stem (3) extends to the top of the valve body (1) and is fixedly installed at the execution end of the actuator (2).

3. The novel zero-leakage lifting valve according to claim 1, characterized in that: The valve plate (4) is located above the valve seat (5). A second annular groove (4-1) is provided at the bottom of the valve plate (4). The second annular groove (4-1) is located above the first sealing ring (6-1) and the second sealing ring (6-2). The actuator (2) drives the valve plate (4) to press against the first sealing ring (6-1) and the second sealing ring (6-2) to form an annular cavity (8) through the valve stem (3).

4. The novel zero-leakage lifting valve according to claim 1, characterized in that: The first sealing ring (6-1) and the second sealing ring (6-2) are made of rubber material, and the sealing surfaces are provided with protruding lips (6-3) on both sides. When the valve is closed, the lips (6-3) are in contact with the surface of the valve plate (4).

5. A novel zero-leakage lifting valve according to claim 1, characterized in that: The air guide pipe (7) introduces external compressed gas to fill the annular cavity (8), and the pressure of the compressed gas is greater than the pressure of the gas on both sides of the valve plate (4) inside the valve body (1).

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