Sealing gate valve

Abstract

The utility model provides a sealing gate valve which comprises a valve body and a gate arranged in the valve body in a sliding mode, the gate is driven by a driving piece, a medium flowing direction is arranged in the valve body, the gate is in a wedge shape, and the gate and the valve body are guided by a V-shaped guide rail to open and close the valve body. A sealing groove is formed in the inner wall of the valve body, a sealing strip is embedded in the sealing groove, the sealing strip is in interference fit with the wedge-shaped face of the inserting plate, the sealing strip is arranged between the opposite side faces of the inserting plate and the sealing groove in the medium flowing direction, and an elastic piece is further arranged between the sealing groove and the sealing strip. According to the sealing gate valve, when the valve body is sealed by the gate, negative pressure or positive pressure of a system acts on the gate, and the gate and the sealing strip between the opposite side faces of the sealing groove in the medium flowing direction can be further pressed.

Description

Technical Field

[0001] This utility model relates to the field of sealing slide valve technology, and in particular to a sealing slide valve. Background Technology

[0002] High negative pressure exhaust systems are widely used in chemical, metallurgical, nuclear, and environmental protection industries. Their core function is to efficiently remove toxic and harmful gases, dust, or radioactive materials, ensuring production safety and environmental protection. In such systems, the sealed gate valve, as a key flow control and isolation component, must achieve zero-leakage sealing under extreme negative pressure conditions, while withstanding multiple challenges such as media corrosion, high temperatures, and particle erosion.

[0003] However, traditional sealed slide gate valves have the following shortcomings in application:

[0004] In traditional sealed slide gate valves, the slide gate and valve body are sealed by a planar seal. Under high negative pressure, the slide gate is prone to leakage due to deformation or wear, which affects the sealing performance between the slide gate and the valve body, and thus leads to a decrease in system efficiency.

[0005] Therefore, in order to solve the above problems, this utility model proposes a sealing slide valve that can improve the sealing reliability and wear tolerance under high negative pressure. Utility Model Content

[0006] To address the technical problems existing in the current sealed gate valve, this utility model provides a sealed gate valve.

[0007] According to one objective of this utility model, this utility model provides a sealing slide gate valve, including a valve body and a slide gate slidably disposed in the valve body. The slide gate is driven by a driving member. A medium flow direction is provided in the valve body. The slide gate is wedge-shaped. The slide gate and the valve body are guided by a V-shaped guide rail to open and close the valve body.

[0008] The valve body has a sealing groove on its inner wall, and a sealing strip is embedded in the sealing groove. The sealing strip and the wedge-shaped surface of the insert plate are interference-fitted. The sealing strip is disposed between the insert plate and the sealing groove on opposite sides in the direction of medium flow. An elastic element is also disposed between the sealing groove and the sealing strip. The elastic element is configured to provide a preload force toward the insert plate for the sealing strip.

[0009] Preferably, there are two V-shaped guide rails, with one V-shaped guide rail on each side of the insert plate perpendicular to the direction of medium flow.

[0010] Preferably, the sealing groove is a stepped sealing groove;

[0011] The inner wall of the valve body is provided with a groove, the V-shaped guide rail is installed at the bottom of the groove, the opening of the groove extends inward to form the sealing groove, the depth of the sealing groove gradually increases with the opening of the groove to form several steps, and the shape of the sealing groove matches the shape of the sealing strip.

[0012] Preferably, the sealing strip is a composite of silicone rubber and graphite.

[0013] Preferably, the surface of the insert plate is coated with a polytetrafluoroethylene (PTFE) wear-resistant layer.

[0014] Preferably, the driving component is a stepper motor, which is connected to the insert plate via a worm gear reducer.

[0015] Preferably, the valve body is provided with an absolute encoder, which is configured to provide real-time feedback on the position of the insert plate, and the absolute encoder and the drive component are electrically connected.

[0016] Preferably, the valve body is provided with an intelligent control system, which includes an electrically connected controller and a touch-sensitive display screen. The controller is configured to receive external commands and, in conjunction with feedback from the absolute encoder, dynamically adjust the speed and direction of the stepper motor through a PID algorithm.

[0017] The display screen is configured to allow setting a target opening degree via touch and displaying a real-time flow curve.

[0018] Preferably, the valve body is provided with an integrated interface, which is electrically connected to the controller, and the integrated interface is configured to support industrial Internet of Things (IIoT) protocols.

[0019] Preferably, the driving component is a cylinder, or a temperature-controlled shape memory alloy.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This sealed slide gate valve uses a V-shaped guide rail to ensure the linear motion accuracy and anti-offset capability of the slide gate. When the slide gate closes the valve body, the system applies negative or positive pressure to the slide gate, and the sealing strip between the slide gate and the sealing groove on opposite sides in the direction of medium flow can be further pressed together.

[0022] The elastic element is configured to provide a preload force toward the insert plate to the sealing strip during use, thereby compensating for wear of the sealing strip and ensuring long-term sealing performance. The sealing strip and the elastic element form a dynamic sealing system, which achieves sealing through a combination of air pressure self-tightening and elastic compensation, balancing high negative pressure sealing reliability and wear tolerance.

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram from one perspective of the sealing slide valve described in this utility model;

[0025] Figure 2 This is a schematic diagram from another perspective of the sealing slide valve described in this utility model;

[0026] Figure 3 This utility model Figure 2 Enlarged diagram of point B in the middle. Detailed Implementation

[0027] The following description is intended to provide a detailed account of the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0028] Please see Figure 1-3 This utility model provides a technical solution: a sealing slide valve, comprising:

[0029] The valve body 100 and the slide plate 200 are slidably disposed within the valve body 100. The slide plate 200 is driven by the drive component 300. A medium flow direction A is provided inside the valve body 100. The slide plate 200 is a wedge-shaped slide plate 200. The slide plate 200 and the valve body 100 are guided by a V-shaped guide rail 400 to open and close the valve body 100, ensuring the linear motion accuracy and anti-offset capability of the slide plate 200.

[0030] See Figure 2 and 3The valve body 100 has a sealing groove 500 on its inner wall, and a sealing strip 600 is embedded in the sealing groove 500. The sealing strip 600 and the wedge-shaped surface of the insert plate 200 are press-fitted. The sealing strip 600 is located between the insert plate 200 and the sealing groove 500 on opposite sides in the medium flow direction A. When the insert plate 200 closes the valve body 100, the system applies negative or positive pressure to the insert plate 200, further tightening the sealing strip 600 between the insert plate 200 and the sealing groove 500 on opposite sides in the medium flow direction A. That is, the higher the pressure, the tighter the seal. An elastic element 700 is also provided between the groove 500 and the sealing strip 600. The elastic element 700 is configured to provide a preload force to the sealing strip 600 toward the insert plate 200 to compensate for wear of the sealing strip 600 during use and ensure long-term sealing performance. The sealing strip 600 and the elastic element 700 form a dynamic sealing system. The dynamic sealing system achieves sealing through air pressure self-tightening and elastic compensation, taking into account both high negative pressure sealing reliability and wear tolerance. Preferably, the elastic element 700 is a spring, and the elastic elements 700 are arranged sequentially at intervals along the length of the sealing strip 600.

[0031] See Figure 2 In this embodiment, there are two V-shaped guide rails 400, and one V-shaped guide rail 400 is respectively provided on each side of the insert plate 200 perpendicular to the medium flow direction A;

[0032] The surface of the insert plate 200 is coated with a polytetrafluoroethylene (PTFE) wear-resistant layer 201 to reduce frictional resistance when the insert plate 200 and the V-shaped guide rail 400 are used together.

[0033] The sealing groove 500 is a stepped sealing groove. Specifically, the inner wall of the valve body 100 has a groove, and the V-shaped guide rail 400 is installed at the bottom of the groove. The opening of the groove extends inward to form the sealing groove 500. The depth of the sealing groove 500 gradually increases towards the opening of the groove, forming several steps. Each step is covered with the sealing strip 600. In this embodiment, the shape of the sealing groove 500 matches the shape of the sealing strip 600, and the outer wall of the sealing strip 600 is flush with the inner wall of the groove. By combining the stepped sealing groove 500 with the sealing strip 600 which has a pressure-resistant self-tightening effect, the leakage rate is predicted to be <0.03% under a negative pressure of 15 kPa in the scenario where the valve body 100 is closed by the insert plate 200.

[0034] The sealing strip 600 is a composite of silicone rubber and graphite. By setting the mating structure of the stepped sealing groove 500 and the silicone rubber-graphite composite sealing strip 600, the stepped sealing groove 500 and the sealing strip 600 can match the wedge-shaped surface of the insert plate 200 during the sealing process, thereby improving the sealing effect between the insert plate 200 and the sealing groove 500.

[0035] The driving component 300 is a stepper motor, which drives the slide plate 200 via a worm gear reducer 301, causing the slide plate 200 to move linearly along the V-shaped guide rail 400. Specifically, the output end of the worm gear reducer 301 is connected to a drive gear 302, and a toothed plate 202 arranged along the length of the V-shaped guide rail 400 is connected to the outer side of the slide plate 200. The drive gear and the toothed plate mesh. The stepper motor has a resolution of 0.1 mm, and the opening control accuracy of the slide plate 200 driven by the stepper motor on the valve body 100 is ±1%. In addition, the PTFE wear-resistant layer 201 combined with the worm gear transmission in the worm gear reducer 301, compared to traditional slide plate valves that rely on manual adjustment of the handle and cannot achieve remote or automated control, are time-consuming and labor-intensive, and manual operation makes it difficult to accurately control the opening. For example, a 10% or 50% reduction in airflow can easily lead to fluctuations in airflow or system imbalance. The slide gate valve provided in this application reduces wear by 80% and has a lifespan of over 50,000 opening and closing cycles. An absolute encoder is installed on the valve body 100, which is configured to provide real-time feedback on the position of the slide gate 200. The absolute encoder and the drive unit 300 are electrically connected to form a closed-loop control. The absolute encoder and the stepper motor form an electric actuator. The combination of the stepper motor and the encoder can achieve a 98% linearity in airflow regulation within the valve body 100, solving the problem that traditional slide gate valves lack an opening sensor, cannot monitor the actual state, rely on experience for judgment, and are prone to misoperation. Furthermore, under the drive of the drive unit 300, the full stroke time of the slide gate 200 is less than 3 seconds to adapt to dynamic operating conditions.

[0036] In another embodiment, the driving component 300 is a cylinder, that is, the slide gate valve is a pneumatic slide gate valve. Compared with the above-mentioned stepper motor drive, the cylinder requires a compressed air source, which limits its environmental adaptability.

[0037] In another embodiment, the driving component 300 is a temperature-controlled shape memory alloy. The driving component 300 can push the insert plate 200 by utilizing the thermal deformation of the alloy. Compared with stepper motors, shape memory alloys have a slower response speed and higher cost.

[0038] The valve body 100 is equipped with an intelligent control system, which includes an electrically connected controller 800 and a touch-sensitive display screen 900. Optionally, the controller 800 is a PLC or a microcontroller 800. The controller 800 is configured to receive external commands, such as 4-20mA signals, and dynamically adjust the speed and direction of the stepper motor through a PID algorithm in conjunction with encoder feedback. The display screen 900 is configured to set the target opening degree by touch and display the real-time flow curve.

[0039] The valve body 100 is provided with an integrated interface 1000, which is electrically connected to the controller 800. The integrated interface 1000 is configured to support industrial Internet of Things (IoT) protocols. Specifically, the integrated interface 1000 supports Modbus / Profinet communication and can be connected to an industrial IoT system to achieve centralized control.

[0040] In summary, this slide gate valve is suitable for high negative pressure (5-15 kPa) dust collection systems such as dust removal in steel plants, chip removal in woodworking workshops, and exhaust ventilation in pharmaceutical workshops. It is especially suitable for scenarios that require frequent airflow adjustment or unmanned operation.

[0041] The slide plate 200 is controlled to move on the valve body 100 by the drive component 300, and the opening of the slide plate 200 is precisely controlled, that is, the opening of the valve body 100 is continuously adjustable from 0 to 100%.

[0042] By setting matching sealing groove 500 and sealing strip 600, leakage between slide plate 200 and valve body 100 is avoided throughout the entire stroke range, adapting to high negative pressure (such as 5~15kPa) working conditions. Furthermore, an elastic element 700 is set between sealing groove 500 and sealing strip 600 to cooperate with elastic compensation for sealing, taking into account both high negative pressure sealing reliability and wear tolerance.

[0043] By combining the insert plate 200 with the V-shaped guide rail 400, mechanical wear is reduced and maintenance frequency is lowered.

[0044] By setting up an integrated interface 1000 that supports Industrial Internet of Things (IIoT) protocols, remote commands and real-time status feedback can be enabled, thereby improving the automation level of the device.

[0045] The embodiments described above are only used to illustrate the technical ideas and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. The scope of patent application of this utility model should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in this utility model still fall within the patent scope of this utility model.

Claims

1. A sealing slide gate valve, comprising a valve body (100) and a slide gate (200) slidably disposed within the valve body (100), the slide gate (200) being driven by a driving member (300), and a medium flow direction (A) being provided within the valve body (100), characterized in that, The insert plate (200) is wedge-shaped, and the insert plate (200) and the valve body (100) are guided by a V-shaped guide rail (400) to open and close the valve body (100); The valve body (100) has a sealing groove (500) on its inner wall. A sealing strip (600) is embedded in the sealing groove (500). The sealing strip (600) and the wedge-shaped surface of the insert plate (200) are interference-fitted. The sealing strip (600) is disposed between the sides of the insert plate (200) and the sealing groove (500) in the medium flow direction (A). An elastic element (700) is also disposed between the sealing groove (500) and the sealing strip (600). The elastic element (700) is configured to provide a preload force to the sealing strip (600) toward the insert plate (200).

2. A sealing slide valve according to claim 1, characterized in that, The number of the V-shaped guide rails (400) is two, and one V-shaped guide rail (400) is respectively provided on both sides of the insert plate (200) perpendicular to the medium flow direction (A).

3. A sealing slide valve according to claim 1, characterized in that, The sealing groove (500) is a stepped sealing groove (500); The inner wall of the valve body (100) is provided with a groove, and the V-shaped guide rail (400) is installed at the bottom of the groove. The opening of the groove extends inward to form the sealing groove (500). The depth of the sealing groove (500) gradually increases in a manner close to the opening of the groove to form several steps. The shape of the sealing groove (500) matches the shape of the sealing strip (600).

4. A sealing slide valve according to claim 1, characterized in that, The sealing strip (600) is a composite of silicone rubber and graphite.

5. A sealing slide valve according to claim 1, characterized in that, The surface of the insert plate (200) is coated with a polytetrafluoroethylene (PTFE) wear-resistant layer (201).

6. A sealing slide valve according to claim 1, characterized in that, The driving component (300) is a stepper motor, which is connected to the insert plate (200) via a worm gear reducer (301).

7. A sealing slide valve according to claim 6, characterized in that, An absolute encoder is provided on the valve body (100), and the absolute encoder is configured to provide real-time feedback on the position of the insert plate (200). The absolute encoder and the drive unit (300) are electrically connected.

8. A sealing slide gate valve according to claim 7, characterized in that, The valve body (100) is equipped with an intelligent control system, which includes an electrically connected controller (800) and a touch-controllable display screen (900). The controller (800) is configured to receive external commands and, in conjunction with feedback from the absolute encoder, dynamically adjust the speed and direction of the stepper motor through a PID algorithm. The display screen (900) is configured to set the target opening degree by touch and display the real-time flow curve.

9. A sealing slide gate valve according to claim 8, characterized in that, The valve body (100) is provided with an integrated interface (1000), which is electrically connected to the controller (800). The integrated interface (1000) is configured to support industrial Internet of Things (IIoT) protocols.

10. A sealing slide gate valve according to claim 1, characterized in that, The drive component (300) is a cylinder, or a temperature-controlled shape memory alloy.

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