Forced sealing ball valve seat replacing device

Abstract

The utility model discloses a valve seat replacing device of a forced sealing ball valve. The valve seat replacing device comprises a positioning assembly and a hydraulic assembly. The positioning assembly comprises a positioning disc and a plurality of positioning blocks, the positioning disc is of a disc structure, and the positioning blocks are arranged along the circumferential face of the positioning disc at intervals and can stretch out and draw back in the radial direction relative to the circumferential face of the positioning disc. The hydraulic assembly comprises a hydraulic pump, an oil cylinder body and a piston, a piston cavity communicated with the hydraulic pump is formed in the oil cylinder body, the piston is movably arranged in the piston cavity of the oil cylinder body and detachably connected with the positioning disc, and the moving direction of the piston is the axial direction of the positioning disc. The valve seat can be conveniently disassembled, and the valve seat and the valve body cannot be damaged; the valve seat dismounting device is simple in structure, convenient to operate and capable of providing stable pushing force for movement of the valve seat in the valve seat dismounting process, and the valve seat dismounting efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve maintenance technical field especially a forced sealing ball valve seat replacement device. BACKGROUND

[0002] When the forced sealing ball valve is maintained or replaced, the conventional method is to disassemble the whole valve from the pipeline for treatment. Since the forced sealing ball valve seat support ring and the valve body are in interference fit, workers often use a copper rod to knock the process groove of the valve seat support ring when disassembling, so that the valve seat support ring is loosened and then taken out. The valve seat support ring is damaged or deformed due to the knocking, which results in the need to replace a new valve seat support ring. The valve seat support ring can also be processed by a lathe. Both of the above methods have the risk of causing damage or deformation of the valve body, which will result in more waste.

[0003] The Chinese utility model patent document with the authorized announcement number CN220680688U discloses a valve seat dismounting tool and valve. In the technical scheme, the valve seat dismounting tool includes a hydraulic device with a telescopic rod that can move up and down, a positioning and guiding device including an assembly block or a clamping mechanism, an end of the assembly block is fixedly sleeved with a valve seat, the outer peripheral surface of the assembly block is matched with the inner wall shape of the through hole of the valve body, so that the assembly block and the through hole remain concentric, the clamping mechanism is composed of multiple connecting rods and clamping jaws, the clamping jaws are located at the ends of the connecting rods connected with the telescopic rod, and multiple pressing rods are connected between at least two connecting rods. The pressing rods press and clamp the at least two clamping jaws on the valve seat. In the technical scheme of the utility model, the valve seat dismounting tool realizes balanced dismounting of the valve seat by means of the positioning and guiding function of the positioning and guiding device. However, the structure of the positioning and guiding device is relatively complex, multiple clamping mechanisms are needed to clamp the valve seat, the fixation between the valve seat dismounting tool and the valve is relatively troublesome, and the transmission of hydraulic pressure through the connecting rod mechanism has room for improvement in stability. UTILITY MODEL CONTENTS

[0004] The utility model discloses a forced sealing ball valve seat replacement device that has the advantages of simple structure, convenient operation and high stability.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a forced sealing ball valve seat replacement device includes a positioning assembly and a hydraulic assembly. The positioning assembly includes a positioning disc and multiple positioning blocks. The positioning disc is a disc structure. The positioning blocks are arranged along the circumferential surface of the positioning disc and can expand or contract radially relative to the circumferential surface of the positioning disc. The hydraulic assembly includes a hydraulic pump, an oil cylinder body, and a piston. The oil cylinder body has a piston cavity that is in communication with the hydraulic pump. The piston is movably arranged in the piston cavity of the oil cylinder body and is detachably connected with the positioning disc. The moving direction of the piston is the axial direction of the positioning disc.

[0006] As the improvement of the above scheme: the positioning disc is detachably connected with positioning block pressing plates corresponding to the positioning blocks, and the positioning block pressing plates are arranged at intervals from the positioning disc to form gaps for the positioning blocks to be inserted; the positioning disc is further provided with wedge-shaped blocks corresponding to the positioning blocks, the wedge-shaped blocks are connected with one end of the positioning blocks inserted into the gaps, the connecting surfaces of the wedge-shaped blocks and the positioning blocks are all inclined surfaces, and the wedge-shaped blocks push the other end of the positioning blocks to extend radially out of the positioning disc through axial movement in the positioning disc.

[0007] As the improvement of the above scheme: further comprising clamping screws and screw fixing plates corresponding to the wedge-shaped blocks, the screw fixing plates are detachably connected to the positioning disc, the screw fixing plates are provided with internal screw holes threadedly matched with the clamping screws, and one end of the clamping screws is in abutment with the wedge-shaped blocks after penetrating through the internal screw holes of the screw fixing plates.

[0008] As the improvement of the above scheme: the end surface of the positioning block, which is not in abutment with the wedge-shaped block, is a conical surface.

[0009] As the improvement of the above scheme: further comprising limiting beads arranged in the positioning block pressing plates, one surface of the positioning block pressing plate close to the positioning block is axially provided with mounting grooves accommodating the limiting beads, the limiting beads are in abutment with compression springs fixed in the mounting grooves, and the surface of the positioning block close to the positioning block pressing plate is provided with limiting grooves matched with the limiting beads.

[0010] As the improvement of the above scheme: the piston is detachably connected with the positioning disc through studs, the center of the piston and the positioning disc are both provided with threaded through holes threadedly matched with the studs; the studs are axially penetrated through the piston and threadedly connected with the positioning disc, one end of the stud close to the piston is threadedly connected with a limiting nut, and the limiting nut is in abutment with the end of the piston away from the positioning disc.

[0011] As the improvement of the above scheme: the oil cylinder body is provided with an oil inlet and an oil outlet communicating with the piston cavity, the oil inlet is communicated with a hydraulic pump through an oil cylinder joint, and the oil outlet is provided with a detachable oil outlet plug.

[0012] As the improvement of the above scheme: the top of the oil cylinder body is detachably connected with a support plate extending in a direction parallel to the axial direction of the piston; and the bottom of the oil cylinder body is fixed with a limiting protrusion.

[0013] As the improvement of the above scheme: the piston is in sealing cooperation with the piston cavity of the oil cylinder body through a plurality of sealing rings.

[0014] The utility model discloses beneficial effect is: the utility model discloses the positioning assembly realizes the positioning of valve seat in the forced sealing ball valve, and the retractable positioning block on the positioning disc in the positioning assembly is pressed against between valve seat and valve body to form the positioning of axial and radial, and through hydraulic assembly as the power source of dismantling valve seat, through the stud, the piston in hydraulic assembly and the positioning disc in positioning assembly are connected and fixed, and the piston axial movement of hydraulic assembly drives the positioning disc connected with it synchronous axial movement, and the positioning disc synchronous promotes valve seat axial movement, and the extrusion force of the interference fit between valve seat and valve body is overcome to make valve seat gradually separate from valve body, realize the convenient dismantling of valve seat, and valve seat and valve body will not be damaged, the utility model discloses simple structure, convenient operation can provide stable propelling force for the movement of valve seat in the process of dismantling valve seat, effectively improve the dismantling efficiency of valve seat. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the sectional view of the utility model;

[0016] Figure 2 It is the schematic view when adopting the utility model to dismantle the valve seat of forced sealing ball valve;

[0017] Figure 3 It is the sectional view of positioning assembly;

[0018] Figure 4 It is the front isometric drawing of positioning assembly;

[0019] Figure 5 It is the back isometric drawing of positioning assembly;

[0020] Figure 6 It is the structure explosion drawing of oil cylinder body.

[0021] Marked as in the drawing: 100-positioning assembly, 110-positioning disc, 120-positioning block, 121-limiting recess, 130-positioning block pressing plate, 131-limiting bead, 132-compression spring, 140-wedge block, 150-tight screw, 160-screw fixing plate, 200-hydraulic assembly, 210-hydraulic pump, 220-oil cylinder body, 221-oil inlet, 222-oil outlet, 223-supporting plate, 224-limiting lug, 230-piston, 240-oil cylinder joint, 250-sealing ring, 300-stud, 310-limiting nut, 400-forced sealing ball valve, 410-valve seat, 420-ball body support seat. DETAILED DESCRIPTION

[0022] In order to facilitate understanding the utility model, the utility model is further explained below in conjunction with the drawings.

[0023] In the description of the utility model, it is necessary to explain, the term "front", "back", "left", "right", "up", "down", "inside" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of description, and it is not indicated or implied that the device or component must have a particular orientation, with a particular orientation structure and operation, therefore it cannot be understood as a limitation on the utility model.

[0024] As Figure 1 and Figure 2 The utility model discloses a forced sealing ball valve seat replacement device comprises positioning assembly 100 and hydraulic assembly 200, positioning assembly 100 is used to realize the positioning between forced sealing ball valve seat replacement device and valve seat 410 in the flow passage of forced sealing ball valve 400, and hydraulic assembly 200 is used to provide power for the dismounting of valve seat 410.When the valve seat 410 of forced sealing ball valve 400 is dismounted, just need to fix positioning assembly 100 in the flow passage of forced sealing ball valve 400, then connect hydraulic assembly 200 with positioning assembly 100, can drive positioning assembly 100 to move axially in the flow passage of forced sealing ball valve 400 through hydraulic assembly 200 to push valve seat 410 to move axially synchronously, to overcome the extrusion force of the interference fit between valve seat 410 and valve body when dismounting to remove valve seat 410 from the valve body.

[0025] As Figures 3 to 5 The positioning assembly 100 in the utility model includes positioning disc 110 and positioning block 120, positioning disc 110 is disc structure, the number of positioning block 120 is multiple, multiple positioning block 120 is spaced apart along the circumference of positioning disc 110, and positioning block 120 can be radially telescopic relative to the circumference of positioning disc 110. Figure 2 As

[0026] Specifically, the mounting structure of positioning block 120 on positioning disc 110 is as shown in Figures 3 to 5As shown, the positioning block pressing plate 130 consistent with the positioning block 120 is fixed on one side end surface of the positioning disc 110, and a gap is left between the positioning block pressing plate 130 and the end surface of the positioning disc 110, which extends to the circumferential surface of the positioning disc 110 as an insertion gap of the positioning block 120, and the positioning block 120 is radially inserted into the gap. Meanwhile, the wedge-shaped block 140 corresponding to the positioning block 120 is arranged in the positioning disc 110, and an axially extending space is arranged in the positioning disc 110 as a moving space of the wedge-shaped block 140, the end surface of the wedge-shaped block 140 contacting the positioning block 120 is a beveled surface, and when the wedge-shaped block 140 moves axially in the positioning disc 110, the axial movement of the wedge-shaped block 140 drives the radial movement of the positioning block 120, so that the radial expansion and contraction of the positioning block 120 on the positioning disc 110 is realized. When the positioning assembly 100 is placed in the flow channel of the forced sealing ball valve 400, the radial expansion of the positioning block 120 can be achieved by moving the wedge-shaped block 140 to push the positioning block 120, so that the positioning assembly 100 is positioned in the groove between the valve seat 410 and the valve body.

[0027] Further, as shown in the utility model, the end surface of the positioning block 120 not contacting the wedge-shaped block 140 is a tapered surface, so that the resistance of the positioning block 120 radially inserted into the groove between the valve seat 410 and the valve body is reduced, and the insertion of the positioning block 120 is facilitated. Figure 3

[0028] Specifically, the utility model discloses that the movement of the wedge-shaped block 140 is realized by arranging the set screw 150. As shown in the utility model, Figure 3 and Figure 5 the set screw 150 is inserted into the moving space of the wedge-shaped block 140 and abuts against the end surface of the wedge-shaped block 140, and the set screw 150 drives the axial movement of the wedge-shaped block 140. The installation of the set screw 150 on the positioning disc 110 is realized by the screw fixing plate 160, the screw fixing plate 160 is fixed on the positioning disc 110 by the fixing screw, the inner screw hole of the screw fixing plate 160 is arranged to be threadedly matched with the set screw 150, the set screw 150 is threadedly connected with the inner screw hole of the screw fixing plate 160 and then extends into the moving space of the wedge-shaped block 140 to abut against the wedge-shaped block 140, and the wedge-shaped block 140 is driven by tightening the set screw 150.

[0029] ​In addition, since the positioning block 120 is only installed in the gap between the positioning disc 110 and the positioning block pressing plate 130 in an inserted manner, it is difficult to ensure that the positioning block 120 cannot fall off from the gap only by relying on the friction between the side surface of the positioning block 120 and the end surface of the positioning disc 110 and the positioning block pressing plate 130, therefore, the utility model also sets an additional limiting structure for the positioning block 120 to realize the fixation of the positioning block 120. Figure 3 As shown in the drawings, an axially extending installation groove is arranged on the end of the positioning block pressing plate 130 connected with the positioning block 120, a limiting bead 131 is placed in the installation groove, the limiting bead 131 is made of a steel bead, and a compression spring 132 is fixed at the bottom of the installation groove, the extension direction of the compression spring 132 is parallel to the axial direction of the positioning disc 110, and the limiting bead 131 abuts against the compression spring 132; at the same time, a limiting groove 121 is arranged on the end surface of the positioning block 120 connected with the positioning block pressing plate 130, and the limiting groove 121 is an arc-shaped groove matched with the limiting bead 131. When the positioning block 120 does not radially extend, the limiting bead 131 is embedded in the limiting groove 121 of the positioning block 120 under the extrusion of the compression spring 132, thereby realizing the radial limitation of the positioning block 120 and avoiding the positioning block 120 from separating from the gap; when the wedge-shaped block 140 moves and pushes the positioning block 120 outward, the positioning block 120 overcomes the resistance generated by the extrusion of the limiting bead 131 by the compression spring 132 under the radial thrust of the wedge-shaped block 140, so that the limiting bead 131 retreats axially to extrude the compression spring 132, the limiting bead 131 separates from the limiting groove 121, and the positioning block 120 is no longer subjected to the axial limiting action of the limiting bead 131, thereby being able to radially extend.

[0030] As shown in the drawings, Figure 1 , Figure 2 and Figure 6 The hydraulic assembly 200 in the utility model comprises a hydraulic pump 210, an oil cylinder body 220 and a piston 230; the piston cavity is arranged in the oil cylinder body 220, the piston 230 is arranged in the piston cavity, the piston cavity is communicated with the hydraulic pump 210, and the high-pressure liquid pumped into the piston cavity by the hydraulic pump 210 can push the piston 230 to move. The piston 230 is connected with the positioning disc 110, the moving direction of the piston 230 is consistent with the axial direction of the positioning disc 110, and then the positioning disc 110 can be pushed to move axially by the movement of the piston 230.

[0031] Specifically, as shown in the drawings, Figure 1 and Figure 2As shown, the detachable connection between the piston 230 and the positioning disc 110 is formed by the stud 300; a threaded through hole which is threadedly matched with the stud 300 is arranged axially in the center of the piston 230, and a threaded through hole which is threadedly matched with the stud 300 is also arranged axially in the center of the positioning disc 110. The stud 300 is threadedly connected with the positioning disc 110 after penetrating the piston 230 axially, and the end of the stud 300 close to the piston 230 is threadedly connected with a limiting nut 310, and the limiting nut 310 abuts against the end of the piston 230 away from the positioning disc 110; after the piston 230 is connected with the positioning disc 110 through the stud 300, the stud 300 is locked through the limiting nut 310 to limit loosening of the stud 300.

[0032] As shown, Figure 6 In the utility model, the oil inlet 221 and the oil outlet 222 are arranged on the oil cylinder body 220, and the oil inlet 221 and the oil outlet 222 are communicated with the piston cavity; the oil inlet 221 is used for being connected with the hydraulic pump 210, as shown, Figure 1 The hydraulic pump 210 is connected at the oil inlet 221 through a pipeline and an oil cylinder joint 240; and the oil outlet 222 is provided with a detachable oil outlet plug. Before the valve seat 410 is disassembled by operating the hydraulic assembly 200, the oil outlet plug can be opened first, the hydraulic pump 210 is operated to inject hydraulic oil into the piston cavity, until the hydraulic oil overflows from the oil outlet 222, so that the air in the piston cavity is exhausted, the sealing property of the piston cavity is ensured, and then the oil outlet plug is installed to seal the oil outlet 222. Further, a plurality of sealing rings 250 can be sleeved on the circumferential surface of the piston 230 to improve the sealing effect between the piston 230 and the oil cylinder body 220.

[0033] Further, in order to improve the fixing stability of the whole forced sealing ball valve seat replacement device in the valve body, as shown, Figure 1 , Figure 2 and Figure 6 The support plate 223 is installed on the top of the oil cylinder body 220, the support plate 223 extends in the direction parallel to the axial direction of the piston 230, and the detachable connection between the support plate 223 and the oil cylinder body 220 can be formed by screws; and the limiting protrusion 224 is arranged at the bottom of the oil cylinder body 220, the shape of the limiting protrusion 224 is matched with the spherical body support seat 420 in the valve body, and the limiting protrusion 224 and the oil cylinder body 220 adopt an integral structure to improve the overall strength. After the positioning assembly 100 is positioned in the valve body of the forced sealing ball valve 400 and the hydraulic assembly 200 is connected with the positioning assembly 100 through the screw rod 300, the support plate 223 connected at the top of the oil cylinder body 220 can be supported axially in the valve body, and the limiting protrusion 224 connected at the bottom of the oil cylinder body 220 can be inserted into the spherical body support seat 420 in the valve body to form support.

[0034] When the valve seat 410 of the forced sealing ball valve is disassembled by using the valve seat replacement device of the forced sealing ball valve of the present invention, Figure 2 As shown, first insert the positioning assembly 100 into the valve body flow channel, and through the positioning and guiding of the positioning disk 110, use the Allen wrench to rotate one of the set screws 150 to make the corresponding wedge block 140 move axially. During the movement of the wedge block 140, the corresponding positioning plate 120 is radially pushed out. Under the action of the wedge block 140, the positioning plate 120 overcomes the axial action of the compression spring 132 and the limiting bead 131 and extends outward and is inserted into the groove formed by the valve seat 410 and the valve body. Then, the other positioning blocks 120 are screwed out in turn to form axial and radial positioning between the positioning disk 110 and the valve seat 410; then the assembled oil cylinder body 220 is hoisted as a whole into the valve body, and the oil cylinder body 220 is positioned and Support, rotate the screw 300 to screw the screw 300 into the threaded through hole of the positioning plate 110, so that the positioning plate 110 is connected to the piston 230; connect the hydraulic pump 210 of the hydraulic assembly 200 with the oil inlet 221 of the cylinder body 220 through the cylinder joint 240, operate the hydraulic pump 210 to discharge the air in the cylinder body 220, and install the oil outlet plug at the oil outlet 222; finally, operate the hydraulic pump 210 again to drive the piston 230 to move axially, push the positioning plate 110 and the valve seat 410 to move axially synchronously, overcome the extrusion force of the interference fit between the valve seat 410 and the valve body, and make the valve seat 410 gradually separate from the valve body, then rotate the stud 300 in the opposite direction to separate the stud 300 from the positioning plate 110, and take out the hydraulic assembly 200 and the positioning assembly 100 in turn.

[0035] The forced sealing ball valve seat replacement device described in the present invention can also assist in assembling the valve seat 410. When installing the valve seat 410, first put the valve seat guide part into the valve seat hole position in the valve body 410, and use the positioning plate to limit the inner hole and end face of the valve seat 410. Then, the hydraulic component 200 of the forced sealing ball valve seat replacement device is assembled and hoisted into the valve body in the reverse direction. The direction of the cylinder body 220 is opposite to the direction when the valve seat 410 is removed. A gasket is placed between the piston 230 and the positioning plate. The piston 230 is driven by the hydraulic pump 210 to move axially toward the valve seat 410. The piston 230 pushes the gasket and transmits the axial force to the positioning plate and the valve seat, pressing the valve seat into the valve seat hole of the valve body. After maintaining the pressure for 30 minutes, the hydraulic component 200, the gasket and the positioning plate can be removed in turn to complete the installation of the valve seat 410.

Claims

1. A device for replacing a seat of a forced seal ball valve, characterized in that: The utility model provides a positioning device and hydraulic component, including positioning component (100) and hydraulic component (200), positioning component (100) includes positioning disc (110) and a plurality of positioning block (120), positioning disc (110) is disc structure, and positioning block (120) is set up along the circumference of positioning disc (110) interval and can be relative to the circumference of positioning disc (110) radial telescopic, hydraulic component (200) includes hydraulic pump (210), oil cylinder body (220) and piston (230), and the piston cavity of oil cylinder body (220) is equipped with with hydraulic pump (210) intercommunication, and piston (230) is set up in the piston cavity of oil cylinder body (220) and is detachably connected with positioning disc (110), and the moving direction of piston (230) is the axial direction of positioning disc (110).

2. The forced seal ball valve seat replacement device of claim 1, wherein: The positioning disc (110) is detachably connected with the positioning block (120) corresponding positioning block pressing plate (130), and the positioning block pressing plate (130) is spaced apart from the positioning disc (110) to form a gap for inserting the positioning block (120). The positioning disc (110) is further provided with a wedge block (140) corresponding to the positioning block (120). The wedge block (140) is connected to one end of the positioning block (120) inserted into the gap. The connecting surface of the wedge block (140) and the positioning block (120) is a bevel surface. The wedge block (140) is moved axially in the positioning disc (110) to push the other end of the positioning block (120) to extend radially out of the positioning disc (110).

3. The forced seal ball valve seat replacement device of claim 2, wherein: Further comprising a tight screw (150) and a screw fixing plate (160) corresponding to the wedge block (140). The screw fixing plate (160) is detachably connected to the positioning disc (110). The screw fixing plate (160) is provided with an internal screw hole for screwing the tight screw (150). One end of the tight screw (150) passes through the internal screw hole of the screw fixing plate (160) and abuts against the wedge block (140).

4. The forced seal ball valve seat replacement device of claim 2, wherein: The end surface of the positioning block (120) not connected to the wedge block (140) is a conical surface.

5. The forced seal ball valve seat replacement device of claim 2, wherein: Further comprising a limiting bead (131) arranged in the positioning block pressing plate (130). The positioning block pressing plate (130) is provided with a mounting groove axially arranged near the positioning block (120) for accommodating the limiting bead (131). The limiting bead (131) abuts against a compression spring (132) fixed in the mounting groove. The positioning block (120) is provided with a limiting groove (121) matching the limiting bead (131) near the positioning block pressing plate (130).

6. The forced seal ball valve seat replacement device of claim 1, wherein: The piston (230) and the positioning disc (110) are detachably connected through a stud (300). The center of the piston (230) and the positioning disc (110) is provided with a threaded through hole for screwing the stud (300). The stud (300) is axially threaded through the piston (230) and is screwed with the positioning disc (110). One end of the stud (300) near the piston (230) is screwed with a limiting nut (310). The limiting nut (310) abuts against the end of the piston (230) away from the positioning disc (110).

7. The forced seal ball valve seat replacement device of claim 1, wherein: The oil cylinder body (220) is provided with an oil inlet (221) and an oil outlet (222) which communicate with the piston cavity, the oil inlet (221) communicates with the hydraulic pump (210) through an oil cylinder joint (240), and the oil outlet (222) is provided with a detachable oil outlet plug.

8. The forced seal ball valve seat replacement device of claim 1, wherein: A support plate (223) is detachably connected to the top of the oil cylinder body (220), and the support plate (223) extends in a direction parallel to the axial direction of the piston (230); and a limiting block (224) is fixed to the bottom of the oil cylinder body (220).

9. The forced seal ball valve seat replacement device of claim 1, wherein: The piston (230) is in sealing cooperation with the piston cavity of the oil cylinder body (220) through a plurality of sealing rings (250).

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