Bidirectional pressure balancing structure of plug valve for high-pressure working condition

Abstract

The utility model discloses a two-way pressure balancing structure of a plug valve for a high-pressure working condition, which comprises a valve body, a plug cock rotatably connected between the upper inner wall and the lower inner wall of a rotating groove in the middle of the valve body, and a two-way pressure balancing mechanism, the bidirectional pressure balancing mechanism comprises a bidirectional pressure groove, a sliding groove, a top plate and an arc-shaped plate, the bidirectional pressure groove and the sliding groove are formed in the inner arc face of the valve body, the arc-shaped plate is slidably connected into the bidirectional pressure groove, and the top plate is slidably connected into the sliding groove. According to the two-way pressure balancing structure of the plug valve for the high-pressure working condition, through cooperation of the arc-shaped plate, the gear and the top plate, two acting forces opposite in direction are applied to the plug cock at the same time through the pressure of high-pressure fluid, so that the internal pressure of the plug valve is balanced; the probability that stress on the plug cock in the single direction is large can be reduced, and the plug valve is more suitable for being used under the high-pressure working condition.

Description

Technical Field

[0001] This utility model relates to the field of plug valve technology, specifically a bidirectional balanced pressure structure for a plug valve used in high-pressure conditions. Background Technology

[0002] A plug valve is a type of valve that controls the flow of fluid by rotating 90 degrees. During the use of a plug valve, in order to maintain a stable operating torque and prevent damage caused by pressure difference, a pressure balancing structure needs to be set inside the plug valve. This effectively reduces the pressure difference on both sides of the valve core, thereby reducing the operating torque and making the valve operation easier.

[0003] In the prior art, patent publication number CN 218494252 U discloses a bidirectional pressure-balanced plug valve opening mechanism, including a valve body with an internal horizontal channel, an interlocking piston I, a sealing plug, an interlocking piston II, a pressure balancing channel, a rubber sealing gasket, a clamping screw, an adjusting locking nut, a safety sealing seat I, a sealing ball, a safety sealing seat II, an embedded sealing gasket, a compression spring, an opening knob, and an annular sealing ring. These structures respectively constitute a pressure balancing mechanism, a safety sealing mechanism, and a low-torque opening mechanism. This structure relies on automatic hydraulic interlocking to ensure pressure balance between the ball's internal pressure and the pressure within the valve body at the pressure-carrying end, allowing the ball to be in a free state for easy opening. However, when the plug valve is used under high-pressure conditions, the end of the plug near the pressure-free side of the valve is not under stress, which can easily lead to greater stress on the end of the plug near the pressure side of the valve, making it inconvenient to use. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a bidirectional balanced pressure structure for a plug valve in high-pressure conditions. By using the pressure of the high-pressure fluid to apply opposing forces in two directions to the plug valve at the same time, the internal pressure of the plug valve is balanced. This can reduce the probability of the plug valve being subjected to excessive force in one direction, making the plug valve more suitable for use in high-pressure conditions and effectively solving the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bidirectional pressure balancing structure for a plug valve under high pressure conditions, comprising a valve body, wherein a plug is rotatably connected between the upper and lower inner walls of the rotating groove in the middle of the valve body, and further comprising a bidirectional pressure balancing mechanism;

[0006] The bidirectional balancing pressure mechanism includes a bidirectional pressure groove, a sliding groove, a top plate, and an arc-shaped plate. The bidirectional pressure groove and the sliding groove are respectively disposed on the inner arc surface of the valve body. The interior of the bidirectional pressure groove is slidably connected to an arc-shaped plate, and the interior of the sliding groove is slidably connected to a top plate. The arc-shaped plates are respectively drivenly connected to the arc-shaped plates corresponding to the longitudinal positions.

[0007] Furthermore, the bidirectional pressure groove includes an arc-shaped groove one and an arc-shaped groove two. The arc-shaped groove one is respectively disposed at the rear end of the inner arc surface of the valve body, and the rear end of the arc-shaped groove one is an open structure. The arc-shaped groove two is respectively disposed at the front end of the inner arc surface of the valve body, and the front end of the arc-shaped groove two is an open structure. The arc-shaped groove one and the arc-shaped groove two are staggered vertically. Arc-shaped plates are slidably connected inside the arc-shaped groove one and the arc-shaped groove two, which can balance the pressure in two directions.

[0008] Furthermore, the bidirectional balancing pressure mechanism also includes a transverse groove, a longitudinal groove, and a rotating groove. The transverse groove is respectively located at the end of the slide groove away from the longitudinal center of the valve body. The end of the transverse groove away from the transverse center of the valve body is provided with a longitudinal groove. The middle of the longitudinal groove is provided with a rotating groove. Arc-shaped groove one and arc-shaped groove two are respectively connected to the horizontally adjacent rotating groove, providing space for the installation of the transmission components.

[0009] Furthermore, the bidirectional balancing pressure mechanism also includes gears and connecting plates. The gears are rotatably connected between the upper and lower inner walls of the rotating groove, and the teeth on the outer arc surface of the arc plate mesh with the adjacent gears. The connecting plates are longitudinally slidably connected in the L-shaped groove formed by the transverse groove and the longitudinal groove. The transverse end of the connecting plate is fixedly connected to the adjacent top plate, and the teeth on the vertical surface of the connecting plate mesh with the adjacent gears to transmit the pressure of the high-pressure fluid.

[0010] Furthermore, both the inner arc surfaces of the first and second arc grooves are provided with limiting grooves, and the inner and outer arc surfaces of the arc plate are provided with sealing blocks. The sealing blocks are slidably connected inside the limiting grooves to seal the arc plate and the arc grooves.

[0011] Furthermore, elastic rubber pads are provided between the inner wall of the transverse groove and the transverse plate of the connecting plate to seal the transverse groove and the connecting plate.

[0012] Furthermore, the sides of the top plate near the valve are all arc-shaped and fit against the outer arc surface of the valve, allowing the top plate to apply force more accurately to the arc surface of the valve.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] By using the combination of the arc plate, gears, and top plate, the pressure of the high-pressure fluid is used to apply opposing forces in two directions to the plug valve simultaneously, thereby balancing the internal pressure of the plug valve. Compared to balancing the pressure inside the groove and the pressure end of the plug valve, this reduces the probability of the plug valve being subjected to excessive force in one direction, making the plug valve more suitable for use under high-pressure conditions. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2This is a top view sectional diagram of the overall device of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the arc-shaped plate of this utility model;

[0018] Figure 4 This is a schematic diagram of the bidirectional pressure groove of this utility model.

[0019] In the diagram: 1 Valve body, 2 Plug, 3 Bidirectional balancing pressure mechanism, 31 Bidirectional pressure groove, 311 Arc groove one, 312 Arc groove two, 32 Sliding groove, 33 Horizontal groove, 34 Longitudinal groove, 35 Rotary groove, 36 Top plate, 37 Connecting plate, 38 Gear, 39 Arc plate, 4 Limiting groove, 5 Sealing block, 6 Elastic rubber pad. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-4 This embodiment provides a technical solution: a two-way balanced pressure structure for a plug valve under high pressure conditions, including a valve body 1, which provides support for the two-way balanced pressure structure. A plug 2 is rotatably connected between the upper and lower inner walls of the rotating groove in the middle of the valve body 1. The plug valve is opened and closed by rotating the plug 2. The sides of the top plate 36 near the plug 2 are all arc-shaped and fit against the outer arc surface of the plug 2, so that the top plate 36 can more accurately apply force to the plug 2.

[0022] The system also includes a bidirectional balancing pressure mechanism 3, which includes a bidirectional pressure groove 31, a slide groove 32, a top plate 36, and an arc plate 39. The bidirectional pressure groove 31 and the slide groove 32 are respectively disposed on the inner arc surface of the valve body 1. The interior of the bidirectional pressure groove 31 is slidably connected to the arc plate 39, and the interior of the slide groove 32 is slidably connected to the top plate 36. The arc plate 39 is respectively connected to the arc plate 39 corresponding to the longitudinal position.

[0023] The bidirectional pressure groove 31 includes an arc-shaped groove 311 and an arc-shaped groove 312. The arc-shaped groove 311 is located at the rear end of the inner arc surface of the valve body 1, and its rear end is open. The arc-shaped groove 312 is located at the front end of the inner arc surface of the valve body 1, and its front end is open. The arc-shaped grooves 311 and 312 are staggered vertically, and arc-shaped plates 3 are slidably connected inside both the arc-shaped grooves 311 and 312. 9. This allows the high-pressure fluid to contact the arc plate 39 when entering the valve body 1 from both directions. The inner arc surfaces of arc groove 1 311 and arc groove 2 312 are provided with limiting grooves 4. The inner and outer arc surfaces of the arc plate 39 are provided with sealing blocks 5. The sealing blocks 5 are slidably connected to the inside of the limiting grooves 4. The sealing blocks 5 are ceramic sealing blocks. By sliding the sealing blocks 5 in the limiting grooves 4, the movement range of the arc plate 39 is limited, while sealing the arc plate 39 and the arc groove.

[0024] The bidirectional balancing pressure mechanism 3 also includes a transverse groove 33, a longitudinal groove 34, and a rotating groove 35. The transverse groove 33 is respectively located at the end of the slide groove 32 away from the longitudinal center of the valve body 1. The end of the transverse groove 33 away from the transverse center of the valve body 1 is provided with a longitudinal groove 34. The middle part of the longitudinal groove 34 is provided with a rotating groove 35. The first arc groove 311 and the second arc groove 312 are respectively connected to the horizontally adjacent rotating groove 35.

[0025] The bidirectional balancing pressure mechanism 3 also includes gears 38 and connecting plates 37. Gears 38 are rotatably connected between the upper and lower inner walls of the rotating groove 35. The teeth on the outer arc surface of the arc plate 39 mesh with the adjacent gears 38. The connecting plates 37 are longitudinally slidably connected in the L-shaped grooves formed by the transverse groove 33 and the longitudinal groove 34. The ends of the transverse plates of the connecting plates 37 are fixedly connected to the adjacent top plates 36. The teeth on the vertical surface of the connecting plates 37 mesh with the adjacent gears 38. Elastic rubber pads 6 are provided between the inner wall of the transverse groove 33 and the transverse plate of the connecting plates 37. The deformation of the elastic rubber pads 6 seals the transverse groove 33 and the transverse plate of the connecting plates 37 during the movement of the connecting plates 37.

[0026] The working principle of this utility model is as follows:

[0027] When the plug valve is used in a high-pressure environment, when the plug valve is in the closed state, according to the direction of the high-pressure fluid entering the valve body 1, the high-pressure fluid will exert a force on the arc plate 39 it contacts, pushing the arc plate 39 to slide closer to the plug 2 in the arc groove. Through the meshing of the teeth of the arc plate 39 with the gear 38, the gear 38 is driven to rotate. Through the meshing of the teeth on the vertical surface of the connecting plate 37 with the gear 38, the connecting plate 37 drives the top plate 36 to slide closer to the plug 2 as well. The top plate 36 applies a force to the outer arc surface of the plug 2 that is opposite to the direction of the high-pressure fluid flow. The high-pressure fluid applies two opposing forces to the plug 2 at the same time, so that the internal pressure of the plug valve is balanced.

[0028] When high-pressure fluid enters the plug valve from another direction, the same principle applies, applying opposing forces in two directions to the plug valve 2, thereby balancing the internal pressure of the plug valve.

[0029] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, 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 high-pressure working cock valve bidirectional balanced pressure structure, the cock valve comprising a valve body (1), a cock (2) being rotatably connected between the upper and lower inner walls of the rotating groove in the middle of the valve body (1), characterized in that: It also includes a bidirectional balanced pressure mechanism (3); The bidirectional balanced pressure mechanism (3) includes bidirectional pressure grooves (31), sliding grooves (32), top plates (36) and arc plates (39), the bidirectional pressure grooves (31) and the sliding grooves (32) are arranged on the inner arc surfaces of the valve body (1) respectively, the arc plates (39) are slidably connected in the bidirectional pressure grooves (31) respectively, the top plates (36) are slidably connected in the sliding grooves (32) respectively, and the arc plates (39) are in transmission connection with the arc plates (39) corresponding in the longitudinal position respectively.

2. The double balanced pressure structure of a plug valve for high pressure service as claimed in claim 1, wherein: The bidirectional pressure grooves (31) include arc grooves one (311) and arc grooves two (312), the arc grooves one (311) are arranged at the rear ends of the inner arc surfaces of the valve body (1) respectively, the rear ends of the arc grooves one (311) are of open structures, the arc grooves two (312) are arranged at the front ends of the inner arc surfaces of the valve body (1) respectively, the front ends of the arc grooves two (312) are of open structures, the arc grooves one (311) and the arc grooves two (312) are distributed in a staggered manner, and the arc plates (39) are slidably connected in the arc grooves one (311) and the arc grooves two (312) respectively.

3. The double balanced pressure structure of a plug valve for high pressure service as claimed in claim 2 wherein: The bidirectional balanced pressure mechanism (3) further includes horizontal grooves (33), longitudinal grooves (34) and rotating grooves (35), the horizontal grooves (33) are arranged at one ends of the sliding grooves (32) away from the longitudinal centers of the valve body (1) respectively, the longitudinal grooves (34) are arranged at the one ends of the horizontal grooves (33) away from the horizontal centers of the valve body (1) respectively, the rotating grooves (35) are arranged at the middle portions of the longitudinal grooves (34) respectively, and the arc grooves one (311) and the arc grooves two (312) are in communication with the horizontally adjacent rotating grooves (35) respectively.

4. The double balanced pressure structure of a plug valve for high pressure service as claimed in claim 3 wherein: The bidirectional balanced pressure mechanism (3) further includes gears (38) and connecting plates (37), the gears (38) are rotationally connected between the upper and lower inner walls of the rotating grooves (35) respectively, the teeth on the outer arc surfaces of the arc plates (39) are in mesh with the adjacent gears (38) respectively, the connecting plates (37) are longitudinally slidably connected in the L-shaped grooves formed by the horizontal grooves (33) and the longitudinal grooves (34) respectively, the horizontal plate ends of the connecting plates (37) are fixedly connected with the adjacent top plates (36) respectively, and the teeth on the vertical plate surfaces of the connecting plates (37) are in mesh with the adjacent gears (38) respectively.

5. The double balanced pressure structure for plug valve in high pressure service as claimed in claim 2 wherein: The inner arc surfaces of the arc grooves one (311) and the arc grooves two (312) are provided with limiting grooves (4), and the inner and outer arc surfaces of the arc plates (39) are provided with sealing blocks (5) which are slidably connected in the limiting grooves (4) respectively.

6. The double balanced pressure structure for plug valve in high pressure service as claimed in claim 4 wherein: The inner walls of the horizontal grooves (33) and the horizontal plates of the connecting plates (37) are provided with elastic rubber pads (6) respectively.

7. The double balanced pressure structure for plug valve in high pressure service as claimed in claim 1 wherein: The side surfaces of the top plates (36) close to the plugs (2) are arc-shaped and are in close contact with the outer arc surfaces of the plugs (2).

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