Explosion-proof electric valve for mine

Abstract

This utility model discloses a mine-use explosion-proof electric valve, including an explosion-proof valve body, an inlet pipe, an outlet pipe, and a motor. The explosion-proof valve body has an internal valve cavity. The inlet pipe is vertically positioned above the explosion-proof valve body and communicates with the valve cavity. The front end of the explosion-proof valve body is connected to the outlet pipe. A valve seat is located inside the valve cavity near the outlet pipe, and the valve seat has a valve hole that communicates with the outlet pipe. The motor is located at the rear end of the explosion-proof valve body, and its output end has an output shaft that extends from the rear end of the explosion-proof valve body into the valve cavity and connects to a valve plug. The end of the valve hole facing the valve plug is the larger diameter end, and the end of the valve hole away from the valve plug is the smaller diameter end. The diameter of the valve plug is smaller than the larger diameter end but larger than the smaller diameter end. This design enables the valve to maintain good throttling control performance during both the initial opening and final closing phases.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a mining explosion-proof electric valve. Background Technology

[0002] In high-risk working environments such as mines and tunnels, centralized control of liquid pipeline systems is commonly used to achieve functions such as liquid transportation, cooling, drainage, and spraying. In these systems, valves, as key components of fluid control, directly affect the overall system's operational efficiency and safety due to their opening and closing speed, sealing performance, and adjustment accuracy. Currently widely used ordinary manual or pneumatic valves suffer from low control accuracy, slow adjustment response, and inconvenient operation, especially in situations requiring dynamic flow regulation, making them unsuitable for practical needs.

[0003] In response to the complex operating environment and frequent start-stop conditions in wells, electric valves are increasingly being used due to their advantages such as high automation, fast response speed, and strong adaptability. However, most existing electric valves have simple structures, only possessing basic on / off functions and lacking precise flow regulation capabilities. Furthermore, traditional electric valves are prone to water hammer effects when high-pressure differential fluids pass through, affecting the stable operation of the equipment. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a mine-use explosion-proof electric valve, comprising an explosion-proof valve body, an inlet pipe, an outlet pipe, and a motor. The explosion-proof valve body has an internal valve cavity. The inlet pipe is vertically positioned above the explosion-proof valve body and communicates with the valve cavity. The front end of the explosion-proof valve body is connected to the outlet pipe. A valve seat is located inside the valve cavity near the outlet pipe, and the valve seat has a valve hole that communicates with the outlet pipe. The motor is located at the rear end of the explosion-proof valve body, and its output end has an output shaft that extends from the rear end of the explosion-proof valve body into the valve cavity and connects to a valve plug. The end of the valve hole facing the valve plug is a large-diameter end, and the end of the valve hole away from the valve plug is a small-diameter end. The diameter of the valve plug is smaller than the large-diameter end but larger than the small-diameter end.

[0005] Preferably, the valve plug has a tapered rod on the side facing the valve hole, and the diameter of the inside of the outlet pipe gradually increases from the end facing the valve hole to the end away from the valve hole.

[0006] Preferably, the valve seat is provided with an annular sealing ring on one side of the valve hole at the large-diameter end.

[0007] Preferably, the output end of the motor is provided with a connecting sleeve, the connecting sleeve is connected to the rear end of the explosion-proof valve body, and the connecting sleeve is sleeved on the outside of the output shaft.

[0008] Preferably, the explosion-proof valve body has a front valve cover and a rear valve cover at its front and rear ends, respectively, and a number of reinforcing rods are connected around the front valve cover and the rear valve cover.

[0009] The advantages of this utility model are: 1. This solution achieves stable guidance and precise flow regulation of liquid flow through the design of a conical valve orifice and a progressive seal on the valve plug. Especially when partially open, it can precisely control the flow rate and pressure, adapting to working conditions requiring precise control, such as mine drainage and cooling, while reducing equipment damage and pipeline vibration caused by sudden pressure changes.

[0010] 2. In this design, the tapered rod on the valve plug side and the gradual change in diameter inside the outlet pipe work synergistically. During opening and closing, the tapered rod guides the liquid smoothly into the tapered valve orifice, reducing turbulence. Meanwhile, the gradual change in diameter of the outlet pipe further smooths the flow velocity transition, preventing pressure fluctuations caused by sudden expansion or contraction of the fluid at the valve's rear end. This combination optimizes the precision of flow regulation and reduces the risk of water hammer through the gradual change in flow path, thus improving the smoothness of liquid flow.

[0011] 3. In this design, the valve seat is equipped with a high-temperature and corrosion-resistant annular sealing ring to ensure a tight seal between the valve hole and the valve plug when closed, preventing liquid leakage. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the present utility model.

[0013] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0014] Figure 3 This is a structural diagram of the valve hole of this utility model.

[0015] In the diagram: 1. Explosion-proof valve body, 2. Inlet pipe, 3. Outlet pipe, 4. Motor, 5. Valve chamber, 6. Valve seat, 7. Valve hole, 8. Output shaft, 9. Valve plug, 10. Large diameter end, 11. Small diameter end, 12. Tapered rod, 13. Annular sealing ring, 14. Connecting sleeve, 15. Front valve cover, 16. Rear valve cover, 17. Reinforcing rod. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Simultaneously, when an component is referred to as "fixed to" or "equipped on" another component, it can be directly on the other component or may have an intervening component present. When an component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present. When an component is referred to as "fixedly connected to" another component, it can be a common fixed connection method such as welding, bolting, or gluing. In short, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] Example 1, such as Figure 1 As shown, a mine-use explosion-proof electric valve includes an explosion-proof valve body 1, an inlet pipe 2, an outlet pipe 3, and a motor 4. The explosion-proof valve body 1 adopts an explosion-proof metal shell design, and the overall structure is made of high-strength alloy steel, possessing excellent impact resistance. Its shell structure can effectively resist explosive shock waves caused by electric sparks or abnormal high temperatures generated during the operation of the internal motor 4, thereby preventing the spread of flames and high-temperature gases to the external mine environment, ensuring the inherent safety and reliability of the equipment in environments containing explosive mixtures of methane, coal dust, etc., such as underground coal mines.

[0020] Combination Figure 2 The explosion-proof valve body 1 has a hollow valve cavity 5 inside. The inlet pipe 2 is vertically arranged above the explosion-proof valve body 1 and is connected to the valve cavity 5 through a flange sealing connection to achieve smooth guidance of liquid from top to bottom. The front end of the explosion-proof valve body 1 has an outlet pipe 3, which is connected to the outlet end of the valve cavity 5 to form a liquid outflow passage. At the lower part of the valve cavity 5, near the outlet end of the outlet pipe 3, there is a valve seat 6. The valve seat 6 has a valve hole 7 with a conical transition structure. One end of the valve hole 7 facing the valve plug 9 has a large diameter structure, and the direction away from the valve plug 9 has a small diameter structure, forming an inward conical structure, which is conducive to the acceleration and guidance of liquid flow.

[0021] The electric motor 4 is installed at the rear end of the explosion-proof valve body 1. The electric motor 4 has an explosion-proof structure, and its output end is equipped with an output shaft 8. The output shaft 8 passes through the rear wall of the explosion-proof valve body 1 and extends into the valve cavity 5. The output end of the electric motor 4 is also equipped with a connecting sleeve 14, which is connected to the rear end of the explosion-proof valve body 1. The connecting sleeve 14 is fitted onto the outside of the output shaft 8 of the electric motor 4. This connecting sleeve 14 is used to reliably connect the electric motor 4 to the explosion-proof valve body 1, and has good mechanical strength and sealing performance. One end of the connecting sleeve 14 is fitted onto the outside of the output shaft 8 of the electric motor 4, and is coaxially arranged with the output shaft 8, which can stably transmit the rotational or linear thrust of the electric motor 4. The other end is firmly connected to the rear end of the explosion-proof valve body 1 through threaded connection, flange connection, or welding, forming an integrated structure to ensure overall rigidity and sealing. The output shaft 8 is connected to the valve plug 9 located in the valve chamber 5. The outer diameter of the valve plug 9 is smaller than the large-diameter end 10 of the valve orifice 7 but larger than the small-diameter end 11. The output shaft 8 is driven by the motor 4 to move precisely in a linear direction, thereby achieving rapid control of the on / off state of the valve orifice 7. Because the size and shape of the valve plug 9 match the conical structure of the valve orifice 7, a progressive sealing fit can be formed in the closed state. This not only improves the sealing effect but also effectively mitigates the water hammer impact caused by rapid valve closure, ensuring the smooth operation of the liquid system.

[0022] In addition, the structure has good flow regulation performance. When the valve plug 9 is in a partially open state, the liquid forms a progressive flow channel through the conical valve hole 7, which helps to achieve fine flow regulation. It is especially suitable for occasions such as mine drainage systems and cooling systems that require precise control of flow rate and pressure.

[0023] Combination Figure 2 and Figure 3 In this design, a tapered rod 12 is provided on the side of the valve plug 9 facing the valve orifice 7. This design, through the transition of shape and the change in the interior of the outlet pipe 3, further optimizes the flow control and sealing performance of the valve. The function of the tapered rod 12 is to guide the liquid flow, allowing the liquid to enter the valve orifice 7 more smoothly during the valve opening and closing process, reducing eddies and turbulence during liquid flow. By setting the tapered structure, the valve plug 9 can further provide a progressive sealing effect during opening and closing, especially in the flow regulation stage, ensuring more stable fluid flow through the valve and improving the valve's precise control capability.

[0024] The diameter of the outlet pipe 3 is designed to gradually increase from the end facing the valve orifice 7 to the end away from the valve orifice. This gradual diameter design facilitates a gradual transition in liquid flow velocity, avoiding the violent impact and water hammer effect during rapid fluid flow, and ensuring the smoothness and controllability of liquid flow. When the valve is partially open, the liquid gradually accelerates as it passes through the valve orifice 7, and its flow velocity increases smoothly after flowing into the outlet pipe 3, reducing equipment damage and pipeline vibration problems caused by excessively rapid pressure changes.

[0025] During the flow of liquid through the valve, the progressive sealing fit between the valve plug 9 and the valve orifice 7 effectively avoids shocks caused by sudden fluid changes, reduces liquid shock waves or water hammer phenomena caused by excessively rapid valve closure or improper opening and closing, thereby extending system life and improving system stability and safety. Furthermore, the gradually increasing pipe diameter also facilitates more precise flow regulation when the valve is partially open, allowing operators to more precisely control the flow rate and adapt to different flow and pressure requirements under various operating conditions, thus enhancing the system's flexibility and reliability.

[0026] An annular sealing ring 13 is provided on one side of the large-diameter end 10 of the valve hole 7 on the valve seat 6. The annular sealing ring 13 is made of a high-temperature and corrosion-resistant material and can withstand high-pressure environments and temperature changes. The annular sealing ring 13 can effectively contact the valve plug 9 and form a sealing surface, ensuring that the gap between the large-diameter end 10 of the valve hole 7 and the valve plug 9 is fully filled when the valve is closed, preventing liquid leakage. The presence of the sealing ring greatly improves the sealing effect of the valve, ensuring that the liquid is completely isolated within the valve cavity 5, preventing external contaminants from entering the system or internal liquid from leaking into the external environment.

[0027] The explosion-proof valve body 1 has a front valve cover 15 and a rear valve cover 16 at its front and rear ends, respectively. Several reinforcing rods 17 are circumferentially connected between the front and rear valve covers 15 and 16. The arrangement of the reinforcing rods 17, forming a circumferential connection between the front and rear valve covers 15 and 16, significantly enhances the overall strength and rigidity of the valve body structure. This effectively disperses external loads or internal pressures, preventing deformation or twisting of the valve body during operation. Especially in high-pressure, harsh working environments, this design maintains the stability of the valve body, preventing structural damage due to excessive pressure or impact, and providing strong assurance for the long-term stable operation of the valve.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mine explosion-proof electric valve, characterized in that: The device includes an explosion-proof valve body (1), an inlet pipe (2), an outlet pipe (3), and a motor (4). The explosion-proof valve body (1) has a valve cavity (5) inside. The inlet pipe (2) is vertically positioned above the explosion-proof valve body (1) and connected to the valve cavity (5). The front end of the explosion-proof valve body (1) is connected to the outlet pipe (3). The valve cavity (5) has a valve seat (6) near the outlet pipe (3) at one end. The valve seat (6) has a valve hole (7) connected to the outlet pipe (3). The motor (4) is located at the rear end of the explosion-proof valve body (1). The output end of the motor (4) is provided with an output shaft (8). The output shaft (8) extends from the rear end of the explosion-proof valve body (1) into the valve cavity (5) and is connected to a valve plug (9). The end of the valve hole (7) facing the valve plug (9) is the large-diameter end (10), and the end of the valve hole (7) away from the valve plug (9) is the small-diameter end (11). The diameter of the valve plug (9) is smaller than that of the large-diameter end (10) and larger than that of the small-diameter end (11).

2. The explosion-proof electric valve for mine as claimed in claim 1, wherein: The valve plug (9) is provided with a tapered rod (12) on the side facing the valve hole (7), and the diameter of the inside of the liquid outlet pipe (3) gradually increases from the end facing the valve hole (7) to the end away from the valve hole (7).

3. The explosion-proof electric valve for mine as claimed in claim 2, wherein: The valve seat (6) is provided with an annular sealing ring (13) on one side of the large diameter end (10) of the valve hole (7).

4. The explosion-proof electric valve for mine as claimed in claim 3, wherein: The output end of the motor (4) is provided with a connecting sleeve (14), which is connected to the rear end of the explosion-proof valve body (1) and is sleeved on the outside of the output shaft (8).

5. The explosion-proof electric valve for mine as claimed in claim 4, wherein: The explosion-proof valve body (1) has a front valve cover (15) and a rear valve cover (16) at its front and rear ends, respectively, and a number of reinforcing rods (17) are connected around the front valve cover (15) and the rear valve cover (16).

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