Polyethylene embedded gate valve

Abstract

The invention relates to the technical field of gate valves, and discloses a polyethylene embedded gate valve which comprises a valve body, a valve body cover is arranged on the valve body, a valve rod is arranged in the middle of the valve body cover, and the insertion end of the valve rod is fixedly connected with a rubber gate plate. The valve body is connected with a valve rod lining through a valve rod sealing ring, a valve rod cover insert is arranged between the valve rod lining and the valve body cover, and a valve body insert is arranged in the valve body. And a filtering mechanism is arranged on the pipeline of the valve body. According to the polyethylene embedded gate valve, the connection problem of the valve can be solved, the polyethylene embedded gate valve can be directly welded to a polyethylene pipeline, the construction cost is low, and connection is reliable; and secondly, the anti-corrosion problem of an original metal material is solved, the valve shell is free of maintenance, and the later maintenance cost of customers is reduced.

Description

Technical Field

[0001] The invention relates to the field of gate valves, in particular to a polyethylene inlaid gate valve. Background Art

[0002] A gate valve is a valve that uses a gate or a wedge-shaped disc, in which the movement direction of the gate is perpendicular to the direction of the fluid. This type of valve can only be fully opened and fully closed, and cannot be used for regulation or throttling. The gate valve is sealed by contact between the valve seat and the gate, and the sealing surface is usually welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. The structure and characteristics of the gate valve determine its application limitations, that is, in the fully open state, the valve plate of the gate valve is completely separated from the fluid, there is almost no flow resistance, and the pressure will basically not drop. However, in order to achieve proper sealing, when the valve is fully closed, there needs to be 360° surface contact between the valve plate and the valve seat. Due to the structural limitations of the gate valve, it is not used for regulation or throttling because precise control cannot be achieved. In addition, the high-speed water flow in the half-open valve may cause erosion on the valve plate and valve seat surface, and generate vibration and noise.

[0003] The design technology feasibility study report of the gate valve pointed out that the gate valve has the advantages of small installation space, low working pressure, not easy to accumulate debris, low price, etc. Since the electric knife gate valve entered my country in the 1980s, its application scope has expanded from ordinary fields to a wider range of industries, including coal preparation, gangue and slag discharge in mines and power plants, and urban sewage treatment.

[0004] With the development of technology, the structure of gate valves has been greatly improved, especially in solving the problems of water leakage and rust in early gate valves. By introducing rubber and high-tech manufacturing technology, the structure and quality of gate valves have been significantly improved. In addition, with the continuous advancement of urbanization, the steady growth of demand in the industrial field, the improvement of safety awareness, the increasingly stringent environmental protection requirements and the obvious trend of consumption upgrading, the electric gate valve industry faces broad market space and development opportunities. The rapid development of intelligent technology has also provided strong support for the intelligent upgrading of electric gate valves, making intelligent electric gate valve products with functions such as remote control, real-time monitoring, and fault diagnosis gradually become the mainstream of the market.

[0005] As polyethylene pipes are widely used, how to connect them with metal valves has become a problem that plagues engineering construction. The current connection methods are either too expensive or unreliable, and the market is in urgent need of a polyethylene gate valve.

[0006] In order to solve the above problems, the present application proposes a polyethylene embedded gate valve. Summary of the invention

[0007] (I) Purpose of the invention

[0008] In order to solve the technical problems existing in the background technology, the present invention proposes a polyethylene inlaid gate valve, which can solve the connection problem of the valve and can be directly welded to the polyethylene pipe, with low construction cost and reliable connection; secondly, it solves the corrosion problem of the original metal material, achieves maintenance-free valve housing, and reduces the customer's subsequent maintenance cost.

[0009] (II) Technical solution

[0010] In order to solve the above problems, the present invention provides a polyethylene inlaid gate valve, comprising a valve body, a valve body cover is provided on the valve body, a valve stem is provided in the middle of the valve body cover, and a rubber gate is fixedly connected to the insertion end of the valve stem;

[0011] The valve body is connected to a valve stem liner via a valve stem sealing ring, a valve stem cover inlay is provided between the valve stem liner and the valve body cover, and a valve body inlay is provided inside the valve body;

[0012] A filtering mechanism is arranged on the pipeline of the valve body.

[0013] Preferably, the filtering mechanism comprises an annular shell and a filter screen, the annular shell is fixedly sleeved on the valve body pipeline and communicated with the valve body pipeline, and the filter screen is fixedly installed inside the annular shell.

[0014] Preferably, the filter screen is rotatably connected to an axial flow fan blade via a rotating shaft, and a brush for cleaning a water-facing surface of the filter screen is fixedly connected to the side of the axial flow fan blade facing the filter screen.

[0015] Preferably, the annular shell is fixedly connected to a sleeve, a piston is slidably sleeved inside the sleeve, an indicator rod is fixedly mounted on the piston, a spring is movably sleeved on the outer periphery of the indicator rod, one end of the spring is fixedly connected to the piston, and the other end of the spring is fixedly connected to the inner wall of the sleeve.

[0016] Preferably, scale lines are provided on the outer circumference of the indicator rod.

[0017] Preferably, the outer shell of the valve body is an inlaid injection molding structure, the outer shell is made of polyethylene material, and the inner shell is inlaid with metal inlays.

[0018] Preferably, the sleeve is a transparent sleeve.

[0019] The above technical solution of the present invention has the following beneficial technical effects:

[0020] The flow of the medium is controlled by the lifting and lowering of the gate. When the valve stem is rotated by a handwheel, motor or other transmission mechanism, the gate will rise accordingly. When the rubber gate is fully raised, the medium can pass through the valve body smoothly, and the valve body is in a fully open state. When the valve stem rotates in the opposite direction, the rubber gate will drop. When the rubber gate is lowered and fits tightly against the valve seat of the valve body, the sealing surfaces between the two will fit each other, preventing the medium from passing through the valve, and it is in a fully closed state. Although the gate valve is mainly used for full-open or full-close control, the flow of the medium can also be controlled to a certain extent by adjusting the rotation angle of the valve stem;

[0021] When the rubber gate is opened and closed reciprocatingly, the waste debris produced due to wear is filtered by the filter, reducing the phenomenon of waste debris passing through the valve body. At the same time, when the fluid passes through the axial flow blades, the axial flow blades drive the bristles to rotate so that the bristles clean the water-facing surface of the filter, thereby reducing the clogging of the filter by waste debris. When there are too many waste debris, the pressure on the water-facing surface of the filter will increase, which will act on the piston and drive the indicator rod to continuously move out of the sleeve, thereby playing an indicating role. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention provides a schematic structural diagram of a polyethylene inlaid gate valve.

[0023] Figure 2 This is a partial structural schematic diagram of a polyethylene inlaid gate valve proposed by the present invention.

[0024] Figure numerals: 1. valve body; 2. valve body cover; 3. valve stem; 4. rubber gate; 5. valve stem sealing ring; 6. valve stem lining; 7. valve stem cover inlay; 8. valve body inlay; 9. filter mechanism; 91. ring shell; 92. filter screen; 93. axial flow fan blade; 94. bristles; 95. sleeve; 96. piston; 97. indicator rod; 98. spring. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0026] like Figure 1-2 As shown, a polyethylene inlaid gate valve proposed by the present invention comprises a valve body 1, a valve body cover 2 is arranged on the valve body 1, a valve stem 3 is arranged in the middle of the valve body cover 2, and a rubber gate plate 4 is fixedly connected to the insertion end of the valve stem 3;

[0027] The valve body 1 is connected to the valve stem liner 6 through the valve stem sealing ring 5, a valve stem cover inlay 7 is provided between the valve stem liner 6 and the valve body cover 2, and a valve body inlay 8 is provided inside the valve body 1;

[0028] A filtering mechanism 9 is provided on the pipeline of the valve body 1 .

[0029] In an optional embodiment, the filter mechanism 9 includes an annular shell 91 and a filter screen 92 . The annular shell 91 is fixedly mounted on the pipeline of the valve body 1 and is connected to the pipeline of the valve body 1 . The filter screen 92 is fixedly installed inside the annular shell 91 .

[0030] Furthermore, the filter screen 92 is rotatably connected to an axial flow fan blade 93 via a rotating shaft, and a brush 94 for cleaning the water-facing surface of the filter screen 92 is fixedly connected to the side of the axial flow fan blade 93 facing the filter screen 92 .

[0031] It should be noted that the bristles 94 can clean the water-facing surface of the filter 92 .

[0032] In an optional embodiment, a sleeve 95 is fixedly connected to the annular shell 91, a piston 96 is slidably sleeved inside the sleeve 95, an indicator rod 97 is fixedly installed on the piston 96, a spring 98 is movably sleeved on the periphery of the indicator rod 97, one end of the spring 98 is fixedly connected to the piston 96, and the other end of the spring 98 is fixedly connected to the inner wall of the sleeve 98.

[0033] Furthermore, scale lines are provided on the outer circumference of the indicator rod 97 .

[0034] It should be noted that the scale lines are provided to indicate the length of the indicator rod 97 moved out, so that the length of the move out can be easily viewed, thereby indirectly providing feedback on the blockage situation.

[0035] In an optional embodiment, the outer shell of the valve body 1 is an inlaid injection molding structure, the outer shell is made of polyethylene material, and the inner shell is inlaid with metal inlays.

[0036] It should be noted that it plays a role in strengthening the overall structural strength.

[0037] In an optional embodiment, the sleeve 95 is a transparent sleeve.

[0038] It should be noted that by setting it as a transparent sleeve, it is easier to observe the internal state of the sleeve 95.

[0039] In the present invention, the flow of the medium is controlled by the lifting and lowering of the gate. When the valve stem is rotated by a handwheel, a motor or other transmission mechanism, the gate will rise accordingly. When the rubber gate is fully raised, the medium can pass through the valve body 1 smoothly, and the valve body 1 is in a fully open state. When the valve stem 3 rotates in the opposite direction, the rubber gate will drop, and when the rubber gate 4 is lowered and fits tightly against the valve seat of the valve body 1, the sealing surfaces between the two will fit each other to prevent the medium from passing through the valve, and it is in a fully closed state. Although the gate valve is mainly used for full-open or full-close control, the flow rate of the medium can also be controlled to a certain extent by adjusting the rotation angle of the valve stem 3;

[0040] When the rubber gate 4 is opened and closed reciprocatingly, the waste debris generated by wear is filtered by the filter 92, reducing the phenomenon of waste debris passing through the valve body 1. At the same time, when the fluid passes through the axial flow blades 93, the axial flow blades 93 drive the bristles 94 to rotate, so that the bristles 94 clean the water-facing surface of the filter 92, thereby reducing the blockage of the filter 92 by waste debris. When there are too many waste debris, the pressure on the water-facing surface of the filter 92 will increase, which will act on the piston 96 and drive the indicator rod 97 to continuously move out of the sleeve 95, thereby playing an indicating role.

[0041] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A polyethylene inlaid gate valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a valve body cover (2), the middle part of the valve body cover (2) is provided with a valve stem (3), and the insertion end of the valve stem (3) is fixedly connected with a rubber gate plate (4); The valve body (1) is connected to a valve stem liner (6) via a valve stem sealing ring (5); a valve stem cover inlay (7) is provided between the valve stem liner (6) and the valve body cover (2); and a valve body inlay (8) is provided inside the valve body (1); A filtering mechanism (9) is provided on the pipeline of the valve body (1).

2. A polyethylene inlaid gate valve according to claim 1, characterized in that: The filtering mechanism (9) comprises an annular shell (91) and a filtering screen (92); the annular shell (91) is fixedly sleeved on the pipeline of the valve body (1) and is in communication with the pipeline of the valve body (1); and the filtering screen (92) is fixedly installed inside the annular shell (91).

3. A polyethylene-embedded gate valve according to claim 2, characterized in that: The filter screen (92) is rotatably connected to an axial flow fan blade (93) via a rotating shaft, and a brush (94) for cleaning the water-facing surface of the filter screen (92) is fixedly connected to the side of the axial flow fan blade (93) facing the filter screen (92).

4. A polyethylene-embedded gate valve according to claim 3, characterized in that: The annular shell (91) is fixedly connected to a sleeve (95), the interior of the sleeve (95) is slidably sleeved with a piston (96), an indicator rod (97) is fixedly mounted on the piston (96), the outer periphery of the indicator rod (97) is movably sleeved with a spring (98), one end of the spring (98) is fixedly connected to the piston (96), and the other end of the spring (98) is fixedly connected to the inner wall of the sleeve (98).

5. A polyethylene-embedded gate valve according to claim 4, characterized in that: The outer circumference of the indicating rod (97) is provided with scale lines.

6. A polyethylene-embedded gate valve according to claim 5, characterized in that: The outer shell of the valve body (1) is an inlaid injection-molded structure, the outer shell is made of polyethylene material, and the inner shell is inlaid with inlaid parts made of metal material.

7. A polyethylene-embedded gate valve according to claim 6, characterized in that: The sleeve (95) is a transparent sleeve.

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