Forced sealing double-gate-plate gate valve

Abstract

The utility model provides a forced sealing double-gate-plate gate valve which comprises a valve body, a valve seat and a valve rod, the valve rod is fixedly connected with a left gate plate and a right gate plate, the bottom of the valve rod is connected with a wedge pressing block, the wedge pressing block abuts against the left gate plate, the middle of the left gate plate penetrates through the wedge pressing block, and the left gate plate moves up and down along with the wedge pressing block in a reciprocating mode. One side of the wedge pressing block is slidably connected with an expansion block, and the middle of the right gate plate penetrates through the expansion block so that the right gate plate can move up and down along with the expansion block. The wedge pressing block at least comprises a pressure inclined surface, and the expansion block at least comprises a component force inclined surface; the wedge pressing block is arranged to be matched with the expansion block, two-way forced sealing of the gate valve is achieved, meanwhile, in the contact sealing process, the wedge pressing block and the expansion block are driven to synchronously move inwards through the pressure of a medium in a pipeline, sealing of the valve plate and the valve seat is rapidly relieved, the opening and closing smoothness of the valve plate is improved, abrasion of the valve plate is reduced, and the service life of the valve is prolonged.

Description

Technical Field

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

[0002] A gate valve is a type of valve that controls opening and closing by the translational movement of a gate. The direction of the gate's movement is perpendicular to the direction of the fluid flow. Therefore, the gate is subject to the impact of the fluid medium, which can cause a certain degree of displacement, thus testing the sealing performance of the gate valve.

[0003] Chinese patent application CN202122199030.8 discloses a double-gate valve, which includes a valve body, a valve stem, a valve cover, and a gate. Each end face of the gate is provided with a guide rail plate. The valve body contains two valve seat rings parallel to the end faces of the gate and symmetrical along the valve stem axis. Each valve seat ring has a guide rail groove matching the guide rail plate on its gate-facing side. A filter screen is provided on the valve seat ring. In this double-gate valve, the valve stem drives the gate to open and close. The guide rail plates on the gate cooperate with the guide rail grooves on the valve seat rings to ensure that the gate does not shift under fluid impact. This ensures that the sealing surfaces at both ends of the gate and the valve seat always move up and down along a vertical plane, minimizing wear on the sealing surfaces and thus ensuring a good seal.

[0004] While this technology improves the sealing effect, the contact between the valve plate and the valve seat suffers severe wear during the opening and closing process, affecting the service life of the valve. Therefore, a new solution is needed to address this problem. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a forced-seal double-gate valve. By setting a wedge block in conjunction with an expansion block, the valve achieves bidirectional forced sealing. Simultaneously, during the sealing process, the pressure of the medium in the pipeline is used to drive the wedge block and the expansion block to move inward synchronously, quickly releasing the seal between the valve plate and the valve seat, improving the smoothness of valve plate opening and closing, reducing valve plate wear, and extending valve service life.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A forced-sealing double-gate valve includes a valve body, a valve seat, and a valve stem. A left gate and a right gate are fixedly connected to the valve stem. A wedge block is connected to the bottom of the valve stem, and the wedge block abuts against the left gate. The middle portion of the left gate passes through the wedge block, and the left gate moves up and down with the wedge block. A swelling block is slidably connected to one side of the wedge block, and the middle portion of the right gate passes through the swelling block, causing the right gate to move up and down with the swelling block. The wedge block includes at least one pressure ramp, and the swelling block includes at least one force-component ramp. The pressure ramp and the force-component ramp separate and abut as the valve stem moves up and down, simultaneously causing the left and right gates to move away from or towards each other.

[0008] According to one embodiment of the present invention, a positioning element is provided in the valve body, and the expansion block contacts and is positioned with the positioning element on the side away from the force-component inclined plane.

[0009] According to one embodiment of the present invention, the inclination angles of the pressure ramp and the force component ramp are both greater than 45 degrees.

[0010] According to one embodiment of the present invention, the pressure ramp and the force component ramp are kept parallel.

[0011] According to one embodiment of the present invention, the left gate plate and the valve seat form a sealing surface one, and the right gate plate and the valve seat form a sealing surface two. The sealing surface one and the sealing surface two begin to work as the pressure inclined surface comes into contact with the force inclination surface.

[0012] According to one embodiment of the present invention, the first sealing surface and the second sealing surface are kept parallel.

[0013] According to one embodiment of the present invention, the first sealing surface includes a first sealing part and a second sealing part respectively disposed on the left gate plate and the valve seat; the second sealing surface includes a third sealing part and a fourth sealing part respectively disposed on the right gate plate and the corresponding valve seat.

[0014] According to one embodiment of the present invention, the first sealing part protrudes from the left gate plate; the second sealing part protrudes from the valve seat; the third sealing part protrudes from the right gate plate; and the fourth sealing part protrudes from the valve seat.

[0015] According to one embodiment of the present invention, a guide plate is further provided on the valve body, and the guide plate guides the valve stem to move linearly up and down.

[0016] The beneficial effects of this utility model are as follows:

[0017] (1) This utility model achieves bidirectional forced sealing of the gate valve by setting a wedge block in conjunction with the expansion block. At the same time, during the contact sealing process, the pressure of the medium in the pipeline is used to drive the wedge block and the expansion block to move inward synchronously, quickly release the seal between the valve plate and the valve seat, improve the smoothness of valve plate opening and closing, reduce valve plate wear, and improve valve service life.

[0018] (2) By setting the angle range of the pressure slope and the force component slope, this utility model further improves the utilization efficiency of the force transmitted from the outside, thereby strengthening the resistance to the impact of the medium and improving the sealing effect.

[0019] In summary, this utility model has advantages such as strong sealing performance and long service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of the wedge pressure block in this utility model.

[0023] Figure 4 This is a schematic diagram of the wedge block structure in this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the expansion block of this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] Example 1

[0028] like Figure 1 As shown, this embodiment provides a forced sealing double gate valve, including a valve body 1, a valve seat 2, and a valve stem 3. The valve stem 3 is characterized in that a left gate 4 and a right gate 5 are fixedly connected to it, a wedge block 6 is connected to the bottom of the valve stem, the wedge block 6 abuts against the left gate 4, the middle part of the left gate 4 passes through the wedge block 6, and the left gate 4 moves up and down with the wedge block 6.

[0029] The wedge block 6 is slidably connected to a swelling block 7 on one side, and the middle part of the right gate 5 passes through the swelling block 7, so that the right gate 5 moves up and down with the swelling block 7.

[0030] The wedge block 6 includes at least one pressure ramp 61, and the expansion block 7 includes at least one force-component ramp 71. The pressure ramp 61 and the force-component ramp 71 separate and abut as the valve stem 3 moves up and down.

[0031] like Figure 1 , Figure 3 and Figure 4 As shown, it should be noted that the wedge block 6 includes a main structure and a triangular prism structure. The triangular prism structure of the wedge block 6 is located on the bottom side of the wedge block 6. The surface formed by one triangular side and the height of the triangular prism structure of the wedge block 6 is connected to the main structure of the wedge block 6. The other triangular side and the height of the triangular prism structure of the wedge block 6 form a pressure inclined surface 61. The expansion block 7 includes a main structure and a triangular prism structure. The triangular prism structure of the expansion block 7 is located on the top side of the expansion block 7. The surface formed by one triangular side and the height of the triangular prism structure of the expansion block 7 is connected to the main structure of the expansion block 7. The other triangular side and the height of the triangular prism structure of the expansion block 7 form a force-component inclined surface 71.

[0032] A positioning element 11 is provided inside the valve body 1, and the expansion block 7 contacts the positioning element 11 and is positioned on the side away from the force-integrating inclined plane 71.

[0033] The pressure inclined plane 61 and the component force inclined plane 71 are kept parallel, and the inclination angles of the pressure inclined plane 61 and the component force inclined plane 71 are both greater than 45 degrees.

[0034] It should be noted that in this embodiment, the inclination angle of the pressure ramp 61 and the force component ramp 71 is 70 degrees. A larger inclination angle can decompose the vertical force transmitted from the outside into more forces parallel to the overall flow trend of the medium.

[0035] The valve body 1 is also provided with a guide plate 12, which guides the valve stem 3 to move up and down in a straight line. It should be noted that in this embodiment, the guide plate 12 is positioned so that it does not directly contact the fluid medium. In this embodiment, the guide plate 12 is positioned outside the channel through which the fluid medium passes.

[0036] Example 2

[0037] like Figure 2 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows:

[0038] The left gate 4 and the valve seat 2 form a sealing surface 21, and the right gate 5 and the valve seat 2 form a sealing surface 22. The sealing surfaces 21 and 22 begin to work as the pressure ramp 61 comes into contact with the force ramp 71. During operation, the sealing surfaces 21 and 22 remain parallel.

[0039] The sealing surface 21 includes a first sealing part 41 and a second sealing part 23 respectively disposed on the left gate plate 4 and the valve seat 2;

[0040] The sealing surface 22 includes a third sealing part 51 and a fourth sealing part 24 respectively disposed on the right gate 5 and the corresponding valve seat 2.

[0041] The first sealing part 41 protrudes from the left gate plate 4; the second sealing part 23 protrudes from the valve seat 2; the third sealing part 51 protrudes from the right gate plate 5; and the fourth sealing part 24 protrudes from the valve seat 2. It should be noted that the above four sealing parts are preferably connected to their corresponding main bodies by welding, using a high-strength, high-wear-resistant alloy for welding to improve the valve's service life.

[0042] Work steps

[0043] The specific working steps of this embodiment are divided into two states: closed and open.

[0044] Step 1: In the closed state, the external force drives the valve stem 3. The valve stem 3 drives the left gate 4 and right gate 5 to move vertically downward along the guide plate 12. The expansion block 7 contacts the positioning element 11 and is positioned by the positioning element 11. The wedge block 6 is pushed by the valve stem 3, causing the wedge block 6 and the expansion block 7 to move outward relative to each other. The pressure slope 61 of the wedge block 6 presses the force slope 71 of the expansion block 7, thereby decomposing the force into two directions perpendicular to the medium passage and parallel to the medium passage. This causes the left gate 4 and right gate 5 to abut against the valve seat 2, thus closing the medium flow passage.

[0045] Step 2, in the open state, the external force drives the valve stem 3. The valve stem 3 drives the left gate 4 and the right gate 5 to move vertically upward against the guidance of the guide plate 12. The pressure of the medium pushes the wedge block 6 and the expansion block 7 to move inward relative to each other, so that the sealing surface is released and the gate is opened smoothly.

[0046] 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 and improvements 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 forced-sealing double-gate valve, comprising a valve body, a valve seat, and a valve stem, characterized in that, The valve stem is fixedly connected to a left gate and a right gate. A wedge block is connected to the bottom of the valve stem. The wedge block abuts against the left gate. The middle part of the left gate passes through the wedge block, and the left gate moves up and down with the wedge block. A swelling block is slidably connected to one side of the wedge block. The middle part of the right gate passes through the swelling block, so that the right gate moves up and down with the swelling block. The wedge block includes at least one pressure inclined surface, and the swelling block includes at least one force-component inclined surface. The pressure inclined surface and the force-component inclined surface separate and abut as the valve stem moves up and down, synchronously driving the left and right gates to move away from or towards each other.

2. The forced-sealing double-gate valve according to claim 1, characterized in that, The valve body is provided with a positioning element, and the expansion block contacts and is positioned with the positioning element on the side away from the force-component inclined plane.

3. The forced-sealing double-gate valve according to claim 1, characterized in that, The inclination angles of both the pressure ramp and the force component ramp are greater than 45 degrees.

4. The forced-sealing double-gate valve according to claim 1, characterized in that, The pressure ramp and the force component ramp remain parallel.

5. The forced-sealing double-gate valve according to claim 1, characterized in that, The left gate and the valve seat form a sealing surface one, and the right gate and the valve seat form a sealing surface two. The sealing surface one and the sealing surface two begin to work as the pressure inclined surface comes into contact with the force inclination surface.

6. The forced-sealing double-gate valve according to claim 5, characterized in that, The sealing surface one and the sealing surface two are kept parallel.

7. The forced-sealing double-gate valve according to claim 5, characterized in that, The sealing surface includes a first sealing part and a second sealing part respectively disposed on the left gate plate and the valve seat; The second sealing surface includes a third sealing part and a fourth sealing part respectively disposed on the right gate and the corresponding valve seat.

8. The forced-sealing double-gate valve according to claim 7, characterized in that, The first sealing part protrudes from the left gate plate; the second sealing part protrudes from the valve seat; the third sealing part protrudes from the right gate plate; and the fourth sealing part protrudes from the valve seat.

9. The forced-sealing double-gate valve according to claim 1, characterized in that, The valve body is also provided with a guide plate, which guides the valve stem to move up and down in a linear motion.

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