Electric valve with high air tightness

Abstract

The utility model discloses an electrically operated valve with high air tightness, which comprises a valve seat, a motor, a valve rod, an output shaft and a connecting plate, the top end of the valve seat is fixedly provided with the motor through a support, the output end of the motor is fixedly connected with the output shaft, and the length of the original connecting plate is shortened, so that the length of the connecting plate is the same as the diameter of the valve rod. A positioning hole and a positioning rod are arranged, the positioning hole and the positioning rod can effectively conduct positioning, it is guaranteed that the device can be rapidly and correctly installed, meanwhile, the length of the connecting plate can be reduced, meanwhile, the firmness between the positioning rod and the connecting plate can be further guaranteed through the positioning rod, and meanwhile sealing stability of the connecting position of the valve rod and the valve seat is guaranteed through a multi-layer sealing structure; the service life is effectively prolonged, and the production efficiency is indirectly improved.

Description

Technical field:

[0001] The utility model relates to the field of coal production and processing, in particular to an electric valve with high air tightness. Background technology:

[0002] Simply put, an electric valve uses an electric actuator to control the valve, thereby realizing the opening and closing of the valve. It can be divided into two parts, the upper part is the electric actuator, and the lower part is the valve. There are two types of electric valves, one is an angular stroke electric valve: the angular stroke electric actuator is used in conjunction with the angular stroke valve to realize the valve rotation within 90 degrees to control the flow of pipeline fluid; the other is a linear stroke electric valve: the linear stroke electric actuator is used in conjunction with the linear stroke valve to realize the up and down movement of the valve plate to control the flow of pipeline fluid. It is usually used in conjunction with equipment with a high degree of automation.

[0003] In the process of coal chemical production, since the electric valve needs to be frequently switched between opening and closing, if it is not replaced in time after a long time, it is likely to cause leakage between the valve stem and the valve seat, thus affecting the overall production efficiency.

[0004] Most of the existing electric valves have a sealing structure added at the connection between the valve seat and the valve stem to ensure sealing, and most of the sealing structures are made of materials such as rubber rings, which leads to the inability to meet normal sealing requirements during long-term wear and tear.

[0005] Therefore, an electric valve is needed that can stably maintain sufficient air tightness for a long time. Utility model content:

[0006] The utility model aims to provide an electric valve with high air tightness.

[0007] The utility model is implemented by the following technical solutions:

[0008] A highly airtight electric valve comprises a valve seat, a motor, a valve stem, an output shaft and a connecting plate, wherein the motor is fixedly mounted on the top of the valve seat via a bracket, the output end of the motor is fixedly connected to the output shaft, the bottom end of the output shaft is fixedly connected to the connecting plate, the bottom end of the connecting plate is fixedly connected to two positioning rods, the top end of the valve stem is provided with two positioning holes, the bottom end of each positioning rod extends into the corresponding positioning hole and is slidably connected thereto, the bottom end of the valve stem extends into the valve seat and is threadedly connected thereto, the output shaft is a telescopic rod, and the connecting plate is fixedly connected to the top end of the valve stem by bolts.

[0009] Preferably, a sealing cover is fixedly connected to the top of the valve seat, the sealing cover is sleeved on the valve stem, a sealing ring is fixedly sleeved on the outer wall of the valve stem, the sealing ring is arranged in the sealing cover, and the outer diameter of the sealing ring is tightly fitted with the inner wall of the sealing cover.

[0010] Preferably, a fixing ring is fixedly sleeved on the top of the sealing cover, a water bag is inserted into the fixing ring, the water bag is in a ring shape, a pressure ring is fixedly connected to the top of the valve stem, the outer ring wall of the pressure ring is fitted with the inner wall of the fixing ring, and the water bag is arranged between the fixing ring and the pressure ring, and two connecting tubes are fixedly connected to the bottom end of the water bag, and the bottom end of each connecting tube is communicated with the sealing cover.

[0011] The advantages of the utility model are as follows: the length of the original connecting plate is shortened so that the length of the connecting plate is the same as the diameter of the valve stem, and a positioning hole and a positioning rod are provided, which can effectively perform positioning, ensuring that the device can be installed quickly and correctly, and at the same time, while reducing the length of the connecting plate, the positioning rod can be used to further ensure the reliability between the two, and a multi-layer sealing structure is used to ensure that the seal at the connection between the valve stem and the valve seat is stable, which effectively increases the service life and indirectly improves the production efficiency. Description of the drawings:

[0012] Figure 1 It is a schematic diagram of the structure of the utility model.

[0013] In the figure: valve seat 1, motor 2, valve stem 3, output shaft 4, positioning hole 5, connecting plate 6, positioning rod 7, sealing cover 8, sealing ring 9, fixing ring 10, water bag 11, pressure ring 12, connecting pipe 13. Specific implementation method:

[0014] like Figure 1 As shown, a highly airtight electric valve comprises a valve seat 1, a motor 2, a valve stem 3, an output shaft 4 and a connecting plate 6. The motor 2 is fixedly installed on the top of the valve seat 1 through a bracket, the output end of the motor 2 is fixedly connected to the output shaft 4, the bottom end of the output shaft 4 is fixedly connected to the connecting plate 6, the bottom end of the connecting plate 6 is fixedly connected to two positioning rods 7, the top end of the valve stem 3 is provided with two positioning holes 5, the bottom end of each positioning rod 7 extends into the corresponding positioning hole 5 and is slidably connected thereto, the bottom end of the valve stem 3 extends into the valve seat 1 and is threadedly connected thereto, the output shaft 4 is a telescopic rod, the connecting plate 6 is fixedly connected to the top end of the valve stem 3 by bolts, the length of the original connecting plate 6 is shortened so that the length of the connecting plate 6 is the same as the diameter of the valve stem 3, and the positioning hole 5 and the positioning rod 7 are provided, the two can be effectively positioned to ensure that the device can be quickly and correctly installed, and at the same time, the length of the connecting plate 6 can be reduced while the positioning rod 7 is used to further ensure the reliability between the two.

[0015] A sealing cover 8 is fixedly connected to the top of the valve seat 1. The sealing cover 8 is sleeved on the valve stem 3. A sealing ring 9 is fixedly sleeved on the outer wall of the valve stem 3. The sealing ring 9 is arranged in the sealing cover 8, and the outer diameter of the sealing ring 9 is tightly fitted with the inner wall of the sealing cover 8. At the same time, the sealing ring 9 is further used to form a secondary seal with the sealing cover 8 to further reduce the occurrence of leakage problems.

[0016] A fixing ring 10 is fixedly sleeved on the top of the sealing cover 8, and a water bag 11 is inserted into the fixing ring 10. The water bag 11 is in a ring shape. A pressure ring 12 is fixedly connected to the top of the valve stem 3. The outer ring wall of the pressure ring 12 is fitted with the inner wall of the fixing ring 10, and the water bag 11 is arranged between the fixing ring 10 and the pressure ring 12. Two connecting pipes 13 are fixedly connected to the bottom end of the water bag 11. The bottom end of each connecting pipe 13 is connected to the sealing cover 8. At the same time, in order to further ensure the sealing, the water bag 11 is added. When the valve stem 3 descends with the rotation of the output shaft 4, the pressure ring 12 will squeeze the water bag 11, so that water will enter the sealing cover 8 along the connecting pipe 13, thereby forming a water seal for the sealing ring 9, thereby ensuring the sealing to the greatest extent.

[0017] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric valve with high air tightness, characterized in that: It includes a valve seat, a motor, a valve stem, an output shaft and a connecting plate, the top end of the valve seat is fixedly installed with a motor through a bracket, the output end of the motor is fixedly connected to the output shaft, the bottom end of the output shaft is fixedly connected to the connecting plate, the bottom end of the connecting plate is fixedly connected to two positioning rods, the top end of the valve stem is provided with two positioning holes, the bottom end of each positioning rod extends into the corresponding positioning hole and is slidably connected thereto, the bottom end of the valve stem extends into the valve seat and is threadedly connected thereto, the output shaft is a telescopic rod, and the connecting plate is fixedly connected to the top end of the valve stem by bolts; the top end of the valve seat is fixedly connected with a sealing cover, the sealing cover is sleeved on the valve stem, a sealing ring is fixedly sleeved on the outer wall of the valve stem, the sealing ring is arranged in the sealing cover, and the outer diameter of the sealing ring is tightly fitted with the inner wall of the sealing cover.

2. The highly airtight electric valve according to claim 1, characterized in that: The top end of the sealing cover is fixedly sleeved with a fixing ring, a water bag is inserted into the fixing ring, the water bag is in a ring shape, the top end of the valve stem is fixedly connected with a pressure ring, the outer ring wall of the pressure ring is fitted with the inner wall of the fixing ring, and the water bag is arranged between the fixing ring and the pressure ring, the bottom end of the water bag is fixedly connected with two connecting pipes, and the bottom end of each connecting pipe is communicated with the sealing cover.

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