Double parallel plate gate valve core

Abstract

This utility model discloses a valve core for a double parallel plate gate valve, relating to the technical field of double parallel plate gate valve cores. It includes a double parallel plate gate valve housing and a valve seat disposed inside the housing. Two parallel valve plates are vertically and movably arranged inside the housing, and these plates cooperate with the valve seat. Two cooperating wedges are vertically and movably arranged between the two valve plates. The width of one end of each wedge is greater than the width of the other end. The inner middle of each wedge is inclined, and both inner ends are flat. The wider end of one wedge faces upward, and a valve stem extends vertically upward from the top of this wider end. A countersunk groove is provided at an eccentric position on the outer side of each valve plate, and a threaded hole penetrating the valve plate is provided at the bottom of the countersunk groove. This utility model can fix the valve plates, preventing them from rotating and the tension spring from loosening, thus preventing the valve from failing to close.

Description

Technical Field

[0001] This utility model relates to the technical field of double parallel plate gate valve cores, specifically a double parallel plate gate valve core. Background Technology

[0002] Double parallel plate gate valves are widely used in industries such as petroleum, chemical, pharmaceutical, and power. They are used for opening and closing in pipelines carrying media such as steam, water, and oil. They feature a compact structure, reasonable design, good valve rigidity, smooth flow path, and low flow resistance coefficient.

[0003] The existing double parallel plate gate valve has a spring loaded between the valve plates. The spring force is always contracting, causing the valve plates to tighten towards the middle wedge. When the valve stem drives the wedge and valve plate to move downward, after reaching a certain position, the wedge opens the valve plate and presses it against the valve seat to ensure the valve's sealing. During the opening and closing process, due to the valve body's eccentricity to the passage, a vortex is generated when the valve is opened to discharge materials. The resulting material vortex will clean the valve cavity itself. All these characteristics make this valve have an extremely long service life.

[0004] However, the existing technology still has shortcomings in use: because the two valve plates of the existing double parallel plate gate valve are connected to the two ends of the spring by threads, and the eddy current generated during the opening and closing process will drive the two valve plates to rotate, and because the two valve plates are not locked and fixed to the spring, the two valve plates do not rotate synchronously. The spring loosens, the valve plates move to both sides, and the gap between the two valve plates increases. This causes the valve plates to collide with other structures inside the valve body, and ultimately the valve cannot be closed, which greatly affects the production progress. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide a double parallel plate gate valve core that can fix the valve plate so that the valve plate cannot rotate and the tension spring will not loosen, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a double parallel plate gate valve core, comprising a double parallel plate gate valve housing and a valve seat disposed inside the double parallel plate gate valve housing, characterized in that: two parallel valve plates are vertically and movably arranged inside the double parallel plate gate valve housing, and the valve plates cooperate with the valve seat; two mutually cooperating wedges are vertically and movably arranged between the two valve plates; the width of one end of the wedge is greater than the width of the other end; the inner middle part of the wedge is inclined, and the two inner ends of the wedge are flat; the wide end of one wedge faces upwards, and the wedge... A valve stem extends vertically upward from the top of the wide end. A countersunk groove is provided at the eccentric position on the outer side of the valve plate, and a threaded hole penetrating the valve plate is provided at the bottom of the countersunk groove. A positioning screw is threaded into the threaded hole. The inner end of the positioning screw extends into a positioning groove vertically opened on the outer side of the wedge. The width of the positioning groove is equal to the diameter of the positioning screw, and the length of the positioning groove is greater than the diameter of the positioning screw. The inner sides of the two valve plates are connected by a spring tensioning assembly, and the spring tensioning assembly passes through a vertically opened movable through slot on the two wedges. The length of the movable through slot is greater than the diameter of the spring tensioning assembly. The upper end of the valve stem is connected to an external pneumatic mechanism. When the valve needs to be closed during use, the pneumatic mechanism drives the valve stem downward, which in turn moves one of the wedges downward. Because the tension spring constantly pulls the two valve plates inward, the two valve plates press against the two wedges. Therefore, the wedges, via positioning screws, drive the valve plates downward. During this downward movement, eddies are generated inside the double parallel plate gate valve body. Since one wedge is fixed to the valve stem, and the two wedges are constantly pressed together by the two valve plates, they do not rotate during the downward movement. The positioning screws threaded onto the two valve plates extend into the positioning grooves on the two wedges, preventing the valve plates from rotating. This will cause the mounting sleeves at both ends of the tension spring to loosen from the mounting groove. The distance between the two valve plates will not change, so there will be no failure of the valve to close and it will not affect the production progress. When the two valve plates move down to the position of contacting the bottom of the double parallel plate gate valve body, the valve stem continues to move down. The valve stem drives one of the wedges to continue to move down. Since there is an inclined surface between the two wedges, the inclined surface of one wedge will move down along the inclined surface of the other wedge. At the same time, the two wedges convert the axial force of the valve stem moving down into a horizontal force. The two wedges overcome the elastic force of the tension spring and squeeze the two valve plates outward until the two valve plates contact the two valve seats, thus completing the valve closure.

[0007] Furthermore, the spring tensioning assembly is a tension spring horizontally disposed between the two valve plates, and both ends of the tension spring are mounted at the center position inside the two valve plates via a mounting assembly. The tension spring serves to tighten the two valve plates inward, and the mounting assembly serves to mount the tension spring onto the two valve plates.

[0008] Furthermore, the mounting assembly consists of mounting sleeves at both ends of the tension spring, with each sleeve threadedly connected to a mounting groove located at the center of the inner side of one of the two valve plates. The mounting sleeves and mounting grooves have mating threads, allowing the tension spring to be easily threaded onto the mounting grooves.

[0009] Furthermore, a sealing ring is provided inside the countersunk groove to cooperate with the nut of the positioning screw. The sealing ring enhances the sealing performance between the nut of the positioning screw and the inside of the countersunk groove.

[0010] Furthermore, two guide plates are vertically arranged at the upper end of the inner cavity of the double parallel plate gate valve housing, which cooperate with the two valve plates. The guide plates serve to guide the two valve plates.

[0011] Based on the above technical solution, the beneficial effects achieved by the valve core of the double parallel plate gate valve of this utility model through practical application are as follows: This invention utilizes the cooperation between the positioning screw and the positioning groove to fix the valve plate in the positioning groove opened on the wedge by the positioning screw. Since the wedge does not rotate, the valve plate will not rotate due to the generated eddy current during the downward movement. This will prevent the mounting sleeve on the tension spring from loosening from the mounting groove, and the distance between the two valve plates will not increase. Therefore, the valve will not fail to close, and the production progress will not be affected. Attached Figure Description

[0012] Figure 1 This is a front-view three-dimensional structural diagram of the present invention.

[0013] Figure 2 This is a left-view stereoscopic structural diagram of the present invention.

[0014] Figure 3 This is a schematic diagram of the internal planar structure of the present invention after being cut open from the middle.

[0015] Figure 4 This utility model Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0016] Figure 5 This is a three-dimensional structural diagram of the valve core assembly in this utility model.

[0017] Figure 6 This utility model Figure 5 A schematic diagram of the three-dimensional structure after the positioning screws have been removed.

[0018] Figure 7 This is a side-view perspective view of the valve core assembly in this utility model.

[0019] Figure 8 This utility model Figure 7 A schematic diagram of the three-dimensional structure after removing the wedges.

[0020] Figure 9 This is a three-dimensional structural diagram of the spring tensioning assembly in this utility model.

[0021] Figure 10 This is a three-dimensional structural diagram of the wedge block in this utility model.

[0022] Figure 11 This is a three-dimensional structural diagram of the valve plate in this utility model.

[0023] Figure 12 This is a schematic diagram of the planar structure of the present invention in use.

[0024] In the diagram: 1-Double parallel plate gate valve body, 2-Valve stem, 3-Valve seat, 4-Guide plate, 5-Valve plate, 6-Wedge block, 7-Positioning screw, 8-Tension spring, 9-Mounting sleeve, 10-Moving through groove, 11-Counterhead groove, 12-Sealing ring, 13-Positioning groove, 14-Threaded hole, 15-Mounting groove. 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] Please see Figure 1-12This embodiment provides a technical solution: a double parallel plate gate valve core, including a double parallel plate gate valve housing 1 and a valve seat 3 disposed inside the double parallel plate gate valve housing 1. The feature is that two parallel valve plates 5 are vertically and movably disposed inside the double parallel plate gate valve housing 1, and the valve plates 5 cooperate with the valve seat 3. Two mutually cooperating wedges 6 are vertically and movably disposed between the two valve plates 5. The width of one end of the wedge 6 is greater than the width of the other end. The middle of the inner side of the wedge 6 is inclined, and both ends of the inner side of the wedge 6 are flat. The wide end of one wedge 6 faces upward, and the top of the wide end of the wedge 6 extends vertically upward. A valve stem 2 is provided, and a countersunk groove 11 is provided at the eccentric position on the outer side of the valve plate 5. A threaded hole 14 is provided at the bottom of the countersunk groove 11, which penetrates the valve plate 5. A positioning screw 7 is threaded inside the threaded hole 14. The inner end of the positioning screw 7 extends into the positioning groove 13 vertically opened on the outer side of the wedge block 6. The width of the positioning groove 13 is equal to the diameter of the positioning screw 7, and the length of the positioning groove 13 is greater than the diameter of the positioning screw 7. The inner sides of the two valve plates 5 are connected by a spring tensioning assembly, and the spring tensioning assembly passes through the vertically opened movable through groove 10 on the two wedge blocks 6. The length of the movable through groove 10 is greater than the diameter of the spring tensioning assembly. The upper end of valve stem 2 is connected to an external pneumatic mechanism. When the valve needs to be closed during use, the pneumatic mechanism drives valve stem 2 to move downwards. Valve stem 2 drives one of the wedge blocks 6 to move downwards. Because the tension spring 8 constantly tightens the two valve plates 5 inwards, the two valve plates 5 press against the two wedge blocks 6. Therefore, the wedge blocks 6 drive the valve plates 5 downwards through the positioning screws 7. During the downward movement of the valve plates 5, eddies are generated inside the double parallel plate gate valve body 1. Since one of the wedge blocks 6 is fixed to valve stem 2, and the two wedge blocks 6 are constantly pressed together by the two valve plates 5, the two wedge blocks 6 will not rotate during the downward movement. The positioning screws 7 threaded on the two valve plates 5 extend into the positioning grooves 13 opened on the two wedge blocks 6, so that the two valve plates 5 will not rotate. This prevents the mounting sleeves 9 at both ends of the tension spring 8 from loosening from the mounting groove 15, and the distance between the two valve plates 5 will not change, thus preventing the valve from failing to close and not affecting the production schedule. When the two valve plates 5 move downwards to the position where they contact the bottom of the double parallel plate gate valve body 1, the valve stem 2 continues to move downwards. The valve stem 2 drives one of the wedges 6 to continue moving downwards. Since there is an inclined surface between the two wedges 6, the inclined surface of one wedge 6 will move downwards along the inclined surface of the other wedge 6. At the same time, the two wedges 6 convert the axial force of the valve stem 2 moving downwards into a horizontal force. The two wedges 6 overcome the elastic force of the tension spring 8 and squeeze the two valve plates 5 outwards until the two valve plates 5 contact the two valve seats 3, thus completing the valve closure.

[0027] Furthermore, the spring tensioning assembly is a tension spring 8 horizontally positioned between the two valve plates 5, and both ends of the tension spring 8 are mounted at the center of the inner sides of the two valve plates 5 via a mounting assembly. The tension spring 8 serves to tighten the two valve plates 5 inward, and the mounting assembly serves to mount the tension spring 8 onto the two valve plates 5.

[0028] Furthermore, the mounting assembly consists of mounting sleeves 9 located at both ends of the tension spring 8. The two mounting sleeves 9 are threadedly connected to mounting grooves 15 opened at the center of the inner side of the two valve plates 5, respectively. The mounting sleeves 9 and the mounting grooves 15 have mating threads, and the mounting sleeves 9 facilitate the threaded installation of the tension spring 8 onto the mounting grooves 15.

[0029] Furthermore, a sealing ring 12 is provided inside the countersunk groove 11 to cooperate with the nut of the positioning screw 7. The sealing ring 12 enhances the sealing performance between the nut of the positioning screw 7 and the inside of the countersunk groove 11.

[0030] Furthermore, two guide plates 4 are vertically arranged at the upper part of the inner side of the double parallel plate gate valve body 1, which cooperate with the two valve plates 5. The guide plates 4 serve to guide the two valve plates 5.

[0031] The working principle of the double parallel plate gate valve core provided by this utility model is as follows: When the valve needs to be closed during use, the external pneumatic mechanism drives the valve stem 2 to move downwards. The valve stem 2 drives one of the wedge blocks 6 to move downwards. Because the tension spring 8 constantly tightens the two valve plates 5 inwards, the two valve plates 5 press against the two wedge blocks 6. Therefore, the wedge blocks 6 drive the valve plates 5 downwards through the positioning screws 7. During the downward movement of the valve plates 5, eddies are generated inside the double parallel plate gate valve body 1. Since one of the wedge blocks 6 is fixed to the valve stem 2, and the two wedge blocks 6 are constantly pressed together by the two valve plates 5, the two wedge blocks 6 will not rotate during the downward movement. The positioning screws 7 threaded on the two valve plates 5 extend into the positioning grooves 13 opened on the two wedge blocks 6, so that the two valve plates 5 will not rotate, thus preventing tension. The mounting sleeves 9 at both ends of the spring 8 are released from the mounting groove 15. The distance between the two valve plates 5 will not change, so there will be no failure of the valve to close and the production progress will not be affected. When the two valve plates 5 move down to the position of contacting the bottom of the double parallel plate gate valve body 1, the valve stem 2 continues to move down. The valve stem 2 drives one of the wedges 6 to continue to move down. Since there is an inclined surface between the two wedges 6, the inclined surface of one wedge 6 will move down along the inclined surface of the other wedge 6. At the same time, the two wedges 6 convert the axial force of the valve stem 2 moving down into a horizontal force. The two wedges 6 overcome the elastic force of the tension spring 8 and squeeze the two valve plates 5 outward until the two valve plates 5 contact the two valve seats 3, thus completing the valve closure.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A double parallel plate gate valve trim comprising a double parallel plate gate valve housing and a valve seat disposed inside the double parallel plate gate valve housing, characterized in that: The double parallel plate gate valve housing has two parallel valve plates vertically movably arranged inside, and the valve plates cooperate with the valve seat. Between the two valve plates, two mutually cooperating wedges are vertically movably arranged. The width of one end of each wedge is greater than the width of the other end. The middle of the inner side of each wedge is inclined, and both ends of the inner side of each wedge are flat. The wide end of one wedge faces upward, and a valve stem extends vertically upward from the top of the wide end of this wedge. A countersunk groove is formed at an eccentric position on the outer side of the valve plate, and a threaded hole penetrating the valve plate is formed at the bottom of the countersunk groove. A positioning screw is threaded into the threaded hole, and the inner end of the positioning screw extends into a vertically formed positioning groove on the outer side of the wedge. The width of the positioning groove is equal to the diameter of the positioning screw, and the length of the positioning groove is greater than the diameter of the positioning screw. The inner sides of the two valve plates are connected by a spring tensioning assembly, and this spring tensioning assembly passes through a vertically formed movable through groove on each of the two wedges, and the length of the movable through groove is greater than the diameter of the spring tensioning assembly.

2. The double parallel plate gate valve trim of claim 1, wherein: The spring tensioning assembly is a tensioning spring horizontally arranged between the two valve plates, and the two ends of the tensioning spring are installed at the center position inside the two valve plates through the mounting assembly.

3. The double parallel plate gate valve trim of claim 2, wherein: The mounting assembly consists of mounting sleeves at both ends of the tension spring, with the two mounting sleeves threadedly connected to mounting grooves opened at the center of the inner side of the two valve plates.

4. The double parallel plate gate valve trim of claim 1, wherein: The countersunk groove is equipped with a sealing ring that mates with the nut of the positioning screw.

5. The double parallel plate gate valve trim of claim 1, wherein: The upper part of the inner cavity of the double parallel plate gate valve is vertically provided with two guide plates that cooperate with the two valve plates.

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