Temporary plugging under-pressure valve replacement structure

Abstract

The utility model discloses a temporary plugging under-pressure valve replacing structure which comprises a connecting base, a fixing pipe is arranged on the connecting base, an installing plate is arranged on the fixing pipe in a sleeved mode, a limiting rod penetrates through the installing plate in a sliding mode, an installing frame is fixedly arranged at one end of the limiting rod, and a first connecting rod and a second connecting rod are arranged on the installing frame in a rotating mode. A connecting frame is rotationally arranged at the free ends of the first connecting rod and the second connecting rod, a sealing assembly is fixedly arranged on the connecting frame, a transmission assembly is further arranged between the mounting frame and the connecting frame, the output end of the transmission assembly is connected with the sealing assembly, and a sliding rod is arranged in the fixing pipe. The connecting rod is used for achieving stretching and retracting of the sealing plug, the size can be reduced during retracting, carrying is convenient, meanwhile, through combination of the gear set, the screw and the threaded pipe, the push plate and the pressing plate can move relatively, and therefore the sealing rubber barrel can be extruded, the sealing rubber barrel expands towards the outer side, and sealing of a pipeline can be completed without cooperation of an inflation device; the use mode is simple and convenient, and the sealing effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline pressure plugging, in particular to a temporary plugging pressure valve replacement structure. Background Art

[0002] With the rapid development of modern oil production, oil refining, and petrochemical industries, enterprises are gradually transitioning to continuous and large-scale operations, and production processes are also developing towards high temperature, high pressure, and multiple material reaction conditions. Continuous production requires equipment systems to operate safely, stably, and normally for a long time. In order to ensure the normal operation of the pipeline system, a large number of valves will be installed in the pipelines of the pipeline system. After long-term use, valves will malfunction. Therefore, in order to ensure the safe operation of the pipeline system, it is necessary to replace the damaged valves.

[0003] There are two existing maintenance and replacement methods. One is to cut off the flow of pipeline medium from the source and then perform maintenance and replacement, but this maintenance method is time-consuming and has a large impact range; the second is to block the position where the valve needs to be replaced. This maintenance method has a small impact range, but the existing blocking methods mostly use airbag blocking, that is, putting the airbag into the pipeline, and then using an inflation device to inflate the airbag, so that the airbag will fit tightly with the inner wall of the pipeline after expansion to block the medium in the pipeline; although this has a good sealing effect, it requires the use of an inflation device for inflation, which is more troublesome and inconvenient to carry.

[0004] Therefore, we need to design a temporary plugging and pressure-changing valve structure to solve these problems. Utility Model Content

[0005] The problem to be solved by the utility model is to provide a temporary blocking pressure-changing valve structure.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A temporary plugging and pressure-changing valve structure comprises a connecting seat, a fixed tube is arranged on the connecting seat, a mounting plate is sleeved on the fixed tube, a limit rod is slidably penetrated on the mounting plate, a mounting frame is fixedly arranged at one end of the limit rod, a first connecting rod and a second connecting rod are rotatably arranged on the mounting frame, a connecting frame is rotatably arranged at the free ends of the first connecting rod and the second connecting rod, a sealing assembly is fixedly arranged on the connecting frame, a transmission assembly is also arranged between the mounting frame and the connecting frame, the output end of the transmission assembly is connected to the sealing assembly, a sliding rod is arranged in the fixed tube, one end of the sliding rod extends from the fixed tube and is inserted into the mounting frame, and a driving gear is fixedly arranged, and the driving gear is connected to the input end of the transmission assembly.

[0008] Preferably, the sealing assembly includes a push plate, a pressure plate and a sealing rubber tube, the sealing rubber tube is located between the push plate and the pressure plate, and the push plate is fixedly connected to the connecting frame, when the pressure plate and the push plate are relatively close to each other, the sealing rubber tube will be squeezed out radially.

[0009] With such arrangement, sealing can be achieved by extruding the sealing rubber tube and fitting it against the inner wall of the pipe.

[0010] Preferably, the transmission assembly includes a driven gear, a transmission shaft, a transmission rod, a universal joint, a screw and a threaded tube, the universal joint is fixedly arranged at both ends of the transmission rod, the threaded tube is fixedly arranged on the pressure plate, one end of the screw is connected to the universal joint at one end of the transmission rod, and the other end passes through the push plate and is inserted into the threaded tube, the transmission shaft is rotatably arranged on the mounting frame, and one end is fixedly connected to the driven gear, and the other end is connected to the universal joint at the other end of the transmission rod.

[0011] With such arrangement, the rotation direction can be changed through the gear set, and the sealing assembly can be driven by the transmission rod to achieve extrusion sealing.

[0012] Preferably, the other end of the sliding rod extends out from the other end of the fixing tube and is fixedly provided with a hand wheel.

[0013] Such an arrangement makes it easy to control the rotation of the driving gear through the hand wheel.

[0014] Preferably, there are two sliding rods, which are symmetrically arranged along the fixed tube.

[0015] Such an arrangement can improve the strength and prevent the limit rod from being twisted.

[0016] Preferably, a tension spring is further provided between the connecting frame and the mounting frame.

[0017] Such an arrangement can ensure that the sealing plug can be retracted from the extended state.

[0018] The advantages and positive effects of the utility model are:

[0019] The utility model discloses utilizes connecting rod to realize the extension and retraction of sealing plug, can reduce the volume when retracting, is easy to carry, and simultaneously can make push plate and pressure plate move relatively through the combination of gear group and screw rod and threaded tube, thereby can squeeze sealing rubber tube, make sealing rubber tube expand outward, can complete the sealing of pipeline without the cooperation of inflating device, is simple and convenient to use, and has good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 This is a schematic diagram of the sealing plug of the utility model in a contracted state;

[0022] Figure 2 It is a schematic diagram of the sealing plug of the utility model in an expanded state;

[0023] Figure 3 It is a longitudinal cross-sectional schematic diagram of the utility model;

[0024] Figure 4 yes Figure 3 A magnified view of the structure in Figure 2.

[0025] The following are the descriptions of the reference numerals:

[0026] 1. Connecting seat; 2. Fixed tube; 3. Sliding rod; 4. Mounting plate; 5. Limiting rod; 6. Mounting frame; 7. First connecting rod; 8. Second connecting rod; 9. Transmission rod; 10. Universal joint; 11. Connecting frame; 12. Screw rod; 13. Threaded tube; 14. Push plate; 15. Pressure plate; 16. Sealing rubber tube; 17. Transmission shaft; 18. Driving gear; 19. Driven gear; 20. Tension spring; 21. Handwheel. DETAILED DESCRIPTION

[0027] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0029] The utility model is further described below in conjunction with the accompanying drawings:

[0030] Example 1: Figure 1-Figure 4 As shown, a temporary plugging and pressure-changing valve structure comprises a connecting seat 1, a fixed tube 2 is arranged on the connecting seat 1, a mounting plate 4 is sleeved on the fixed tube 2, a limit rod 5 is slidably penetrated on the mounting plate 4, a mounting frame 6 is fixedly arranged at one end of the limit rod 5, a first connecting rod 7 and a second connecting rod 8 are rotatably arranged on the mounting frame 6, a connecting frame 11 is rotatably arranged at the free ends of the first connecting rod 7 and the second connecting rod 8, a sealing assembly is fixedly arranged on the connecting frame 11, a transmission assembly is also arranged between the mounting frame 6 and the connecting frame 11, the output end of the transmission assembly is connected to the sealing assembly, a sliding rod 3 is arranged in the fixed tube 2, one end of the sliding rod 3 extends from the fixed tube 2 and is inserted into the mounting frame 6, and a driving gear 18 is fixedly arranged, and the driving gear 18 is connected to the input end of the transmission assembly.

[0031] Specifically, the sealing assembly includes a push plate 14, a pressure plate 15 and a sealing rubber tube 16. The sealing rubber tube 16 is located between the push plate 14 and the pressure plate 15, and the push plate 14 is fixedly connected to the connecting frame 11. When the pressure plate 15 and the push plate 14 are relatively close to each other, the sealing rubber tube 16 will be squeezed out radially. Such an arrangement can achieve sealing by squeezing the sealing rubber tube 16 to fit against the inner wall of the pipe.

[0032] Specifically, the transmission assembly includes a driven gear 19, a transmission shaft 17, a transmission rod 9, a universal joint 10, a screw 12 and a threaded tube 13. The universal joint 10 is fixedly arranged at both ends of the transmission rod 9, and the threaded tube 13 is fixedly arranged on the pressure plate 15. One end of the screw 12 is connected to the universal joint 10 at one end of the transmission rod 9, and the other end passes through the push plate 14 and is inserted into the threaded tube 13. The transmission shaft 17 is rotatably arranged on the mounting frame 6, and one end is fixedly connected to the driven gear 19, and the other end is connected to the universal joint 10 at the other end of the transmission rod 9. Such an arrangement can realize the change of the rotation direction through the gear group, and at the same time, the transmission rod 9 can drive the sealing assembly to realize extrusion sealing.

[0033] Specifically, the other end of the slide rod 3 extends out from the other end of the fixed tube 2 and is fixedly provided with a hand wheel 21 . This arrangement facilitates controlling the rotation of the driving gear 18 through the hand wheel 21 .

[0034] Specifically, there are two slide rods 3 , which are symmetrically arranged along the fixed tube 2 . Such an arrangement can improve the strength and prevent the limiting rod 5 from being twisted.

[0035] Specifically, a tension spring 20 is further provided between the connecting frame 11 and the mounting frame 6 , and such a configuration can ensure that the sealing plug can be retracted from the extended state.

[0036] The working process of this embodiment is as follows: when in use, the sealing plug is inserted into the pipeline from the flange joint that has been welded to the pipeline, and then the connecting seat 1 is fixed to the welded flange joint by bolts, and then the hand wheel 21 is pushed downward. When the sealing plug contacts the inner wall of the pipeline, the two sealing plugs will slide toward each other. During the sliding, the first connecting rod 7 and the second connecting rod 8 will rotate, and the tension spring 20 will also be stretched.

[0037] At the same time, the limit rod 5 will slide relative to the mounting plate 4, and when the two sealing plugs move toward each other on both sides and unfold, the hand wheel 21 will be turned. After the hand wheel 21 is turned, it will drive the slide rod 3 to rotate, and after the slide rod 3 is rotated, it will drive the driving gear 18 to rotate, and after the driving gear 18 is rotated, it will drive the driven gear 19 to rotate. After the driven gear 19 rotates, the transmission shaft 17 will rotate at the same time, and the rotation will be transmitted to the threaded rod through the universal joint 10 and the transmission rod 9. After the threaded rod rotates, it will drive the pressure plate 15 to move toward the push plate 14 with the cooperation of the threaded tube 13, and the pressure plate 15 will squeeze the sealing rubber tube 16 when moving toward the push plate 14, so that the sealing rubber tube 16 begins to expand outward, and the expanded sealing rubber tube 16 will contact the inner wall of the pipeline to achieve sealing of the pipeline.

[0038] After the valve replacement is completed, the hand wheel 21 is rotated in the opposite direction. When the hand wheel 21 rotates in the opposite direction, the driving gear 18 is driven to rotate in the opposite direction through the slide rod 3. When the driving gear 18 rotates in the opposite direction, it drives the meshing driven gear 19 to rotate in the opposite direction. When the driven gear 19 rotates in the opposite direction, it pushes the pressure plate 15 to move away from the push plate 14 through the transmission rod 9. When the pressure plate 15 is away from the push plate 14, the sealing rubber tube 16 will shrink inward. The shrunk sealing rubber tube 16 will be separated from the inner wall of the sealing tube. Then, the slide rod 3 is pulled upward by the hand wheel 21. When the slide rod 3 moves upward, it will drive the mounting frame 6 to move upward, so that the two sealing plugs are relatively close. Finally, the bolts are removed and the connecting seat 1 is removed from the connecting flange.

[0039] In this embodiment, the limit rod 5 cooperates with the mounting plate 4 to ensure that the mounting frame 6 will not rotate when the driving gear 18 drives the driven gear 19 to rotate. At the same time, in order to avoid distortion when the limit rod 5 is extended too long, the mounting plate 4 can be replaced by sliding tubes welded on both sides of the fixed tube 2, so that the limit rod 5 can be inserted into the sliding tube. When the sliding rod 3 slides in the fixed tube 2, the limit rod 5 can also slide in the sliding tube. Since the limit rod 5 always remains coaxial with the limit rod 5 when sliding in the sliding tube, it can largely avoid distortion when the limit rod 5 is extended too long.

[0040] At the same time, in order to ensure that the zero sealing plug can be extended after being inserted into the pipeline, the angle between the axis of the first connecting rod 7 and the second connecting rod 8 and the horizontal plane does not exceed ninety degrees after the sealing plug is contracted, and the two sealing plugs can enhance the sealing effect.

[0041] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A temporary plugging and pressure-changing valve structure, comprising a connecting seat (1), characterized in that: The connecting seat (1) is provided with a fixing tube (2), the fixing tube (2) is fitted with a mounting plate (4), a limiting rod (5) is slidably passed through the mounting plate (4), one end of the limiting rod (5) is fixedly provided with a mounting frame (6), a first connecting rod (7) and a second connecting rod (8) are rotatably provided on the mounting frame (6), a connecting frame (11) is rotatably provided at the free ends of the first connecting rod (7) and the second connecting rod (8), a sealing assembly is fixedly provided on the connecting frame (11), a transmission assembly is also provided between the mounting frame (6) and the connecting frame (11), the output end of the transmission assembly is connected to the sealing assembly, a sliding rod (3) is provided in the fixing tube (2), one end of the sliding rod (3) extends from the fixing tube (2) and is inserted into the mounting frame (6), and a driving gear (18) is fixedly provided, and the driving gear (18) is connected to the input end of the transmission assembly.

2. A temporary plugging and pressure-changing valve structure according to claim 1, characterized in that: The sealing assembly comprises a push plate (14), a pressure plate (15) and a sealing rubber tube (16); the sealing rubber tube (16) is located between the push plate (14) and the pressure plate (15); the push plate (14) is fixedly connected to the connecting frame (11); when the pressure plate (15) and the push plate (14) are relatively close to each other, the sealing rubber tube (16) will be extruded in the radial direction.

3. A temporary plugging and pressure-changing valve structure according to claim 2, characterized in that: The transmission assembly comprises a driven gear (19), a transmission shaft (17), a transmission rod (9), a universal joint (10), a screw rod (12) and a threaded tube (13); the universal joint (10) is fixedly arranged at both ends of the transmission rod (9); the threaded tube (13) is fixedly arranged on the pressure plate (15); one end of the screw rod (12) is connected to the universal joint (10) at one end of the transmission rod (9), and the other end passes through the push plate (14) and is inserted into the threaded tube (13); the transmission shaft (17) is rotatably arranged on the mounting frame (6), and one end is fixedly connected to the driven gear (19), and the other end is connected to the universal joint (10) at the other end of the transmission rod (9).

4. A temporary plugging and pressure-changing valve structure according to claim 1, characterized in that: The other end of the sliding rod (3) extends out from the other end of the fixed tube (2) and is fixedly provided with a hand wheel (21).

5. The temporary plugging and pressure-changing valve structure according to claim 1 is characterized in that: The number of the sliding rods (3) is two, and they are symmetrically arranged along the fixed tube (2).

6. A temporary plugging and pressure-changing valve structure according to claim 1, characterized in that: A tension spring (20) is also provided between the connecting frame (11) and the mounting frame (6).

Images