CN114458774B

CN114458774B - Isolation air valve

Info

Publication number: CN114458774B
Application number: CN202210138122.1A
Authority: CN
Inventors: 梁立明; 张庆涛; 杨静远; 李雨明; 孟宇; 贾艳歧; 王仁付
Original assignee: Shijiazhuang Xianchu Nuclear Equipment Co Ltd
Current assignee: Shijiazhuang Xianchu Nuclear Equipment Co Ltd
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2023-12-12
Anticipated expiration: 2042-02-15
Also published as: CN114458774A

Abstract

The invention provides an isolation air valve, which comprises a driving device, a connecting rod mechanism, a valve body assembly, a tension spring adjusting device, a valve plate sealing device, a valve plate and a shaft, wherein the valve plate is arranged on the valve plate; the driving device is arranged on the outer side of the valve body assembly through an electric mounting bracket; the connecting rod mechanism is arranged in the left side of the valve body assembly; an output shaft of the driving device is fixedly connected with an input shaft of the connecting rod mechanism; the shaft is connected with the valve plate through a tension spring adjusting device; the shaft is rotationally connected with the valve body assembly; the seal ring of the valve plate sealing device is arranged on the valve seat in the valve body assembly. The isolation air valve is simple in integral installation/disassembly, convenient to maintain, integrally coordinated, compact in structure, good in sealing performance, strong in anti-seismic performance and stable in operation.

Description

Isolation air valve

Technical Field

The invention belongs to the technical field of valves, and relates to an isolation air valve.

Background

The isolation air valve is the most critical valve of the nuclear island ventilation isolation system, is the last physical barrier for preventing radioactive substances from leaking, has the key effect that when severe nuclear safety leakage accidents occur, the isolation air valve is required to be rapidly isolated, the air flows at the two sides of the valve are cut off and separated, nuclear pollution sources are controlled inside, and nuclear leakage events are avoided. Otherwise, once a leakage accident occurs, the hazard cannot be measured. At the same time, the shock resistance safety of the isolation valve equipment is very important, and according to national safety regulations, the isolation valve must be subjected to shock resistance performance verification to ensure the structural integrity and functional stability of the equipment during or after the operation reference earthquake (LLE) and the safety shutdown earthquake (SSE 1).

The isolation air valve has only two working states in operation: opening and closing, the regulating valve has a certain leakage level, so the isolating air valve has higher requirement than the regulating valve. The isolating valves installed in different valve positions (installation positions) have certain requirements on the opening and closing speeds of the isolating valves.

At present, a rectangular isolation valve is an important device of a ventilation system in a nuclear island factory, and is opened and closed through an electric or manual device, so that the ventilation system is isolated. The defects and problems existing in the existing isolating valve structure and motion mode are as follows:

1) Link mechanism

Most of the connecting rod mechanisms driven by the valve plates are of no-counter-force rocker arm structures, and most of the connecting rod mechanisms are of single-row connecting rod structure types, and problems that in the torque transmission process, the valve plates are not in contact with the sealing rings, the rotation of the valve plates and the torque transmission are unstable or too small occur.

2) Valve body structure

The left side frame (or right side frame) of the valve body is of an integral bending structure, and the connecting rod mechanism, the rocker arm, each shaft, the bearing and the bearing seat are all contained in the valve body. In terms of assembly: when the connecting rod mechanism, each shaft, the rocker arm and the bearing are installed, the whole left side frame is required to be assembled, the space is narrow, and the assembly efficiency is low; meanwhile, in the assembly process, visible parts are single, the problems of missing installation, wrong installation and the like often occur, and the requirements on the skills of an assembly master are high; secondly, when the isolation valve after assembly is opened in place and closed incompletely, the designer, the inspector and the assembler cannot conduct rechecking of the parts, and all the parts have to be disassembled to find out the problem. After the connecting rod mechanism is installed, the left end of the left side frame is required to be provided with the device support and the positioning plates of all shafts through bolts, and as the left side frame is an integral bending piece, the bending length is long, the left side frame is always internally or externally bent, the phenomenon that the device support and the positioning plates are not matched with bolt holes on the left side frame is unavoidable, and hole enlarging measures such as reworking and repairing are often adopted, so that the assembly process is slow, and the problem is continuous.

In terms of nuclear island installation: the whole valve body is connected with the auxiliary flange through bolts, and the left side frame is of an integral bending structure, and the bolt holes are arranged on the inner side (close to the central line of the valve body) of the left side frame, so that the bolts in the left side frame are extremely difficult to install and adjust when the isolating valve is connected with the flange or the pipeline, and the installation master is a great skill test.

In terms of nuclear island maintenance: the bearing seat in the left frame in the multi-shaft (multi-valve plate/multi-blade) structure is characterized in that the grease nipple is reserved in the structure, so that the lubrication and maintenance of the bearing are facilitated, but the bearing seat is arranged in the left frame of the valve body and is a part which can not be reached by a maintenance staff. In short, grease was not injected although there was a grease nipple.

The series of problems exist in the processes of assembly, maintenance, installation and the like, and are a great difficulty to be solved urgently by various national institutes and factories.

3) Movement mode of valve plate (composite movement)

At present, the valve plate movement modes of the isolation valve in the nuclear power industry are two types: a pure tension spring structure and a pressure spring adjustable structure. The pure tension spring structure and the pressure spring adjustable structure can effectively generate moment in the blade switching process, so that the blade switching process is constrained and fixed. The tension spring in the pure tension spring structure has high accurate calculation difficulty, and meanwhile, the assembly errors of the valve plates (blades) are accumulated, so that the assembly effect is poor and satisfactory, and manual adjustment is often needed on site. The pressure spring adjustable structure has more parts, and the blade has to be divided into three sections due to structural arrangement, so that the manufacturing process is complicated, and the structure is relatively complex.

4) Sealing strip pattern and mounting pattern

The sealing rubber strip on the current rectangular isolation valve is rectangular and provided with a small semicircular boss, and is clamped in the valve seat groove, and the fastening screw is obliquely screwed into the rubber strip through the valve seat to be fixed. In the running process of the valve, the valve is often opened and closed, and the valve plate is frequently in friction contact with and separated from the sealing ring, so that the small semicircular solid boss on the sealing ring is worn, and the sealing failure and leakage of different degrees of the valve are caused.

5) Valve plate and rocker arm structure

The driving rocker arms of the existing valve plate are two, a plurality of driving rocker arms are arranged at two ends of the valve plate, the whole valve plate is in contact with the sealing ring to compact two pin shafts on the rocker arms which are all close to the two ends, when the overall dimension of the isolating valve structure is oversized, the sealing between the middle part of the valve plate and the sealing ring is weaker, and meanwhile, the structural strength of the valve plate is thinner.

Disclosure of Invention

In order to solve the technical problems, the invention provides the isolation air valve which is simple in integral installation/disassembly, convenient to maintain, integrally coordinated, compact in structure, good in sealing performance, strong in anti-seismic performance and stable in operation.

In order to achieve at least one of the above purposes, the invention adopts the technical scheme that the isolation air valve comprises a driving device, a connecting rod mechanism, a valve body assembly, a tension spring adjusting device, a valve plate sealing device, a valve plate and a shaft; the driving device is arranged on the outer side of the valve body assembly through an electric mounting bracket; the connecting rod mechanism is arranged in the left side of the valve body assembly; an output shaft of the driving device is fixedly connected with an input shaft of the connecting rod mechanism; the shaft is connected with the valve plate through a tension spring adjusting device; the shaft is rotationally connected with the valve body assembly; the seal ring of the valve plate sealing device is arranged on the valve seat in the valve body assembly.

Further, the connecting rod mechanism comprises an input shaft, one end of the input shaft is rotationally connected with the middle frame of the valve body assembly, and the other end of the input shaft is fixedly connected with the output shaft of the driving device through a shaft hole of the left frame of the valve body assembly; one end of the main rotating arm is fixedly connected with the input shaft, and the other end of the main rotating arm is rotationally connected with one end of the first connecting rod; the other end of the first connecting rod is rotationally connected with one end of a first counter-force rocker arm, a middle hole of the first counter-force rocker arm is connected with one end of the driving connecting rod, and the other end of the first counter-force rocker arm is fixedly connected with the first supporting shaft; the other end of the driving connecting rod, one end of the third connecting rod and one end of the second counter-force rocker arm are rotationally connected; the other end of the second counter-force rocker arm is fixedly connected with the second supporting shaft; the other end of the third connecting rod is rotationally connected with one end of the first rocker arm, and the other end of the first rocker arm is fixedly connected with the shaft; each shaft is fixedly connected with a passive radial arm, and each passive radial arm is rotationally connected with the same passive connecting rod; the first support shaft and the second support shaft are both rotationally connected to the intermediate frame, and the second support shaft is arranged right above the first support shaft.

Further, in the link mechanism, the rotation connection parts between the main swing arm and the first link, between the first link and the first counter-force rocker arm, between the first counter-force rocker arm and the driving link, between the driving link and the third link and the second counter-force rocker arm, between the third link and the first rocker arm, and between the passive swing arm and the passive link are connected through a pin roll, a flat washer and a cotter pin.

Further, the tension spring adjusting device comprises a bracket; one end of the bracket is fixedly connected to the shaft, and the other end of the bracket is fixedly connected with the adjusting block; the sliding sleeve is slidably arranged in the adjusting block, and can slide up and down in the adjusting block; the adjusting screw is vertically arranged in the sliding sleeve and is in threaded connection with the sliding sleeve, the adjusting screw is rotated, and the sliding sleeve can slide up and down in the adjusting block; the supporting ring is positioned between the adjusting screw and the adjusting block to prevent the adjusting screw from shaking left and right; one end of a tension spring (407) is fixedly connected with the valve plate, and the other end of the tension spring is fixedly connected with the sliding sleeve; the limiting component is fixedly arranged on the inner side of the right frame and plays a role in preventing the valve plate from being continuously opened when the valve plate is opened; the positioning shaft penetrates through the adjusting block and the annular groove at the lower part of the adjusting screw rod, and the tail end of the positioning shaft is fixed through a nut.

Further, the limiting component consists of an L-shaped bending piece and a bolt, wherein the L-shaped bending piece is fixed on the limiting and opening-assisting seat plate of the valve body component, the bolt is connected with the L-shaped bending piece through threads, and the bolt head is downward and plays a role in blocking the valve plate.

Further, the sealing ring is a single D-shaped sealing ring with a D-shaped bulge; the D-shaped bulge is a semicircular bulge with a hollow.

Further, the valve plate sealing device further comprises a valve plate reinforcing structure; the valve plate reinforcing structure comprises a middle plate, a side rocker arm and a supporting block; the middle plate, the herringbone plate and the hemming plate form a valve plate, wherein the herringbone plate and the middle plate are fixed on the hemming plate, and the middle plate is positioned between the herringbone plates; the support block is fixed on the hemming plate and is positioned between the herringbone plate and the hemming plate; one end of the side rocker arm is fixedly connected with the shaft, and the other end of the side rocker arm is rotationally connected with the supporting block.

The device further comprises an opening assisting assembly, wherein the opening assisting assembly consists of a positioning tooth sleeve, a stud, an adjusting block and a fastening piece; the positioning tooth sleeve is in a circular ring shape, and gear teeth are arranged in the inner circle; the positioning tooth sleeve and the stud are fixedly arranged on the inner side of the right frame, wherein the stud is positioned in the positioning tooth sleeve and is coaxial with the positioning tooth sleeve; the adjusting block is formed by welding a cam with a through hole and a gear, and the gear is meshed with gear teeth of the positioning gear sleeve; the adjusting block and the fastening piece are sleeved on the stud, the gear of the adjusting block is positioned in the positioning tooth sleeve, and the fastening piece is used for fixing the adjusting block.

Further, the valve body assembly comprises a lower frame, a left frame, a middle frame, an upper frame and a right frame; the lower frame, the left frame, the middle frame, the upper frame and the right frame are fixedly connected according to the positions of the lower frame, the left frame, the middle frame, the upper frame and the right frame, and the valve seat is fixedly arranged between the middle frame and the right frame; the left frame, the middle frame and the right frame are respectively provided with a shaft hole, and the shaft holes on the right frame are through holes; the bearing seat is fixedly arranged at the outer side of the shaft hole of the right frame; the limiting and opening-assisting seat plate is fixedly arranged on one side, close to the right frame, of the middle frame and on the inner side of the right frame.

Further, the isolation air valve further comprises a positioning plate, wherein the positioning plate is fixed on the valve body assembly and located on the same side of the valve body assembly with the driving device.

The beneficial effects of the invention are as follows:

1. the invention can ensure that the valve plate rotates stably, the valve plate and the sealing ring are compressed tightly, the structure is more stable, and the problems of insufficient torque and poor sealing in the transmission process are avoided;

2. the invention solves a series of problems of serious deformation of a side frame bending sheet metal part of the isolation valve, difficult maintenance of a bearing, difficult disassembly and assembly of a connecting rod mechanism, difficult installation of a field flange bolt and the like, reduces the difficulty of processing and sheet metal bending control, reduces the production and maintenance cost, greatly improves the assembly and field installation efficiency, fully ensures the structural strength and the anti-seismic performance of the isolation valve, and prolongs the service lives of parts and the whole machine;

3. the invention effectively solves the problem that the upper rotation moment acted on the valve plate can be effectively regulated through the tension spring regulating device, and fully ensures the free translation and no interference between the valve plate and the sealing ring;

4. the invention adopts the opening assisting component of the involute gear sleeve structure, has simple/compact structure, good anti-seismic effect, durability and difficult looseness;

5. the D-shaped sealing ring with the steps is hollow, the elasticity of the part, which is in contact with the valve plate, of the sealing ring is large, the compression allowance is large, and the problem of sealing inaccuracy caused by errors of the sealing surface of the valve seat in the processing and assembling processes is avoided; meanwhile, the problem that the sealing is not tight due to long-term abrasion of the rubber strip is solved, and leakage and sealing are affected. The tightness and the safety are improved;

6. according to the invention, when the size of the isolating valve structure is large, the reinforcing rocker structure is added in the middle of the valve plate, so that the strength of the valve plate is improved, and the integral tightness is ensured.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an isometric view of an isolation damper according to an embodiment of the present invention.

Fig. 2 is a front view of an isolation damper according to an embodiment of the present invention.

Fig. 3 is a front view of a linkage mechanism according to an embodiment of the present invention.

Fig. 4 is a left side view of a linkage of an embodiment of the present invention.

Fig. 5 is a B-B cross-sectional view of fig. 3.

Fig. 6 is an isometric view of a linkage of an embodiment of the present invention.

FIG. 7 is a schematic view of a valve body assembly according to an embodiment of the present invention.

Fig. 8 is a schematic structural view of a tension spring adjusting device according to an embodiment of the present invention.

Fig. 9 is an enlarged view of I in fig. 1.

Fig. 10 is a schematic view of the tension spring adjusting device in the valve plate closed state according to the embodiment of the present invention.

Fig. 11 is a schematic view of the tension spring adjusting device of the embodiment of the present invention when the valve plate is just started to open.

Fig. 12 is a schematic view of the tension spring adjusting device of the embodiment of the present invention when the valve plate is opened half way.

Fig. 13 is a schematic view of the tension spring adjusting device of the embodiment of the present invention when the valve plate is completely opened.

Fig. 14 is an exploded view of an opening assist assembly in accordance with an embodiment of the present invention.

Fig. 15 is a schematic view showing the connection of the reinforcing structure of the valve plate according to the embodiment of the present invention.

Fig. 16 is an exploded view of a valve plate reinforcing structure according to an embodiment of the present invention.

FIG. 17 is a schematic view of a single D-ring seal according to an embodiment of the present invention.

FIG. 18 is a schematic diagram of the butt joint of two ends of a single D-shaped seal ring according to an embodiment of the invention.

Fig. 19 is an enlarged view of ii in fig. 8.

Fig. 20 is an enlarged view of iii in fig. 8.

In the figure, a driving device, a connecting rod mechanism, a valve body assembly, a tension spring adjusting device, a valve plate sealing device, an opening assisting assembly, a positioning plate and an electric installation bracket are respectively arranged in the figure, wherein the driving device, the connecting rod mechanism, the valve body assembly, the tension spring adjusting device, the valve plate sealing device, the opening assisting assembly and the positioning plate are respectively arranged in the figure, and the positioning plate is arranged in the figure; 201. the hydraulic actuator includes a first support shaft, 203, a main swing arm, 204, a first connecting rod, 205, a first opposing rocker arm, 206, a drive connecting rod, 207, a second opposing rocker arm, 208, a third connecting rod, 210, a driven connecting rod, 211, a driven swing arm, 213, a second support shaft, 214, a pin, 215, a flat washer, 216, a cotter pin, 301, a lower frame, 302, a left frame, 303, a middle frame, 305, a right frame, 306, a valve seat, 307, a bearing seat, 308, a limit and assist seat plate, 406, a valve plate, 407, a tension spring, 408, a locating shaft, 409, an adjusting screw, 410, a sliding sleeve, 411, a limit assembly, 412, a bracket, 414, 417, an adjusting block, 418, a support ring, 501, a side rocker arm, 505, a middle plate, 506, a gusset, 507, a support block, 515, a single D-type seal ring, 601, a locating tooth sleeve, 602, 603, and 604.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1-2, the present invention provides an isolation air valve, comprising a driving device 1, a link mechanism 2, a valve body assembly 3, a tension spring adjusting device 4, a valve plate sealing device 5, a positioning plate 7, a valve plate 406 and a shaft 414; wherein, the driving device 1 is installed on the outer side of the valve body assembly 3 through the electric mounting bracket 8, the positioning plate 7 is fixed on the valve body assembly 3 and is positioned on the same side of the valve body assembly 3 with the driving device 1, the positioning plate 7 is used for limiting each supporting shaft and shaft 414 of the link mechanism 2, and preventing each supporting shaft and shaft 414 of the link mechanism 2 from shaking and jumping out; the connecting rod mechanism 2 is arranged inside the left side of the valve body assembly 3; an output shaft of the driving device 1 is fixedly connected with an input shaft 201 of the connecting rod mechanism 2; one end of the tension spring adjusting device 4 is fixedly arranged on the shaft 414, and the other end is fixedly connected with the valve plate 406; shaft 414 is rotatably coupled to valve body assembly 3; the sealing ring of the valve plate sealing device 5 is mounted on a valve seat 306 in the valve body assembly 3.

Further, as shown in fig. 3-6, the valve body assembly 3 includes a lower frame 301, a left frame 302, a middle frame 303, an upper frame 304, a right frame 305, a valve seat 306, a bearing seat 307, a limit and opening-aid seat plate 308; the lower frame 301, the left frame 302, the middle frame 303, the upper frame 304 and the right frame 305 are connected by welding according to the positions of the lower, left, middle, upper and right, and the valve seat 306 is fixedly arranged between the middle frame 303 and the right frame 305; the left frame 302, the middle frame 303 and the right frame 305 are respectively provided with a shaft hole, wherein the shaft holes on the right frame 305 are through holes, and each shaft hole is used for installing various shafts of the connecting rod mechanism 2; the bearing seat 307 is fixedly installed outside the shaft hole of the right frame 305; the limiting and opening assisting seat plate 308 is fixedly arranged on one side, close to the right frame 305, of the middle frame 303 and on the inner side of the right frame 305, and is used for installing a limiting component 411 of the tension spring adjusting device 4.

The valve body assembly 3 is formed by welding all frames creatively, and compared with the traditional bending sheet metal, the valve body assembly is higher in forming strength and not easy to deform. Moreover, the invention adopts the structure of the middle frame 303, can be matched with the connecting rod mechanism 2 of the invention for use, provides sufficient installation, operation and maintenance space for the double-row connecting rod mechanism 2, ensures that the connecting rod mechanism 2 runs safely and stably, and skillfully avoids the problems of small assembly space, inconvenient maintenance and the like caused by the fact that the traditional isolating air valve adopts a left frame to install the connecting rod structure.

Further, as shown in fig. 7, the link mechanism 2 includes an input shaft 201, one end of the input shaft 201 is rotatably connected with the middle frame 303 of the valve body assembly 3, and the other end of the input shaft 201 is fixedly connected with the output shaft of the driving device 1 through the shaft hole of the left frame 302 of the valve body assembly 3; one end of the main radial arm 203 is fixedly connected with the input shaft 201, and the other end of the main radial arm 203 is rotatably connected with one end of the first connecting rod 204; the other end of the first connecting rod 204 is rotationally connected with one end of a first counter-force rocker arm 205, the middle hole position of the first counter-force rocker arm 205 is connected with one end of a driving connecting rod 206, and the other end of the first counter-force rocker arm 205 is fixedly connected with a first support shaft 202; the other end of the driving connecting rod 206, one end of the third connecting rod 209 and one end of the second counter-force rocker arm 207 are rotationally connected; the other end of the second reaction rocker arm 207 is fixedly connected with a second support shaft 213; the other end of the third connecting rod 209 is rotationally connected with one end of the first rocker arm 208, and the other end of the first rocker arm 208 is fixedly connected with the shaft 414; each shaft 414 is fixedly connected with one end of each passive radial arm 211, the other end of each passive radial arm 211 is rotationally connected with one passive connecting rod 210, and the passive radial arms 211 are parallel to each other; the first support shaft 202 and the second support shaft 213 are both rotatably connected to the intermediate frame 303, and the second support shaft 213 is mounted directly above the first support shaft 202.

Further, the first counter-force rocker 205 is of a bent structure, the bent angle is an obtuse angle (i.e. greater than 90 degrees), and the bent portion is provided with a middle hole for rotationally connecting with the driving link 206.

The connecting rods and the rocker arms of the connecting rod mechanism 2 are arranged in two rows, the left row is a torque input row, the right row provides torque for opening and closing the valve, and the double rows can increase transmission torque and ensure stable opening and closing of the valve.

In the link mechanism 2, the pivotal connection portions between the main arm 203 and the first link 204, between the first link 204 and the first reaction force rocker 205, between the first reaction force rocker 205 and the driving link 206, between the driving link 206 and the third link 209 and the second reaction force rocker 207, between the third link 209 and the first rocker 208, and between the passive arms and the passive link 210 are preferably connected by a pin 214, a flat washer 215, and a cotter pin 216.

Preferably, the first link 204, the driving link 206 and the third link 209 are all of a double-layer structure, so as to increase the firmness of the mechanism.

Further, as shown in fig. 8-13, the tension spring adjusting device 4 includes a tension spring 407, a limiting component 411 and a bracket 412; wherein, one end of the bracket 412 is fixedly connected to the shaft 414, and the other end of the bracket 412 is fixedly connected to the adjusting block 417; the sliding sleeve 410 is slidably mounted inside the adjusting block 417, and the sliding sleeve 410 can slide up and down in the adjusting block 417; the adjusting screw 409 is vertically installed in the sliding sleeve 410 and is in threaded connection with the sliding sleeve 410, the adjusting screw 409 is rotated, and the sliding sleeve 410 can slide up and down in the adjusting block 417; the supporting ring 418 is positioned between the adjusting screw 409 and the adjusting block 417 to prevent the adjusting screw 409 from shaking left and right; one end of a tension spring 407 is fixedly connected with the valve plate 406, the other end of the tension spring is fixedly connected with the sliding sleeve 410, and the stretching degree of the spring 407 can be adjusted through the up-and-down sliding of the sliding sleeve 410; the limiting component 411 is fixedly arranged on the inner side of the right frame 305, and plays a role in blocking the valve plate 406 from being opened continuously when the valve plate 406 is opened; the positioning shaft 408 passes through the adjusting block 417 and the annular groove at the lower part of the adjusting screw 409, the end of the positioning shaft 408 is fixed by a nut, and the positioning shaft 408 plays a role in preventing the adjusting screw 409 from moving up and down.

When the valve plate 406 is opened/closed, the rotation moment acting on the valve plate 406 can be effectively adjusted through the tension spring adjusting device 4, so that the free translation of the valve plate 406 relative to the sealing ring is fully ensured, and no interference exists; meanwhile, after a certain period of use, the elasticity of the tension spring 407 is weakened or the sealing ring is worn, so that the sealing is not tight, the tension spring adjusting device 4 can prolong the service life of the valve and ensure the tightness without replacing the tension spring 407.

Further, the limiting component 411 is composed of an L-shaped bending piece and a bolt, wherein the L-shaped bending piece is fixed on the limiting and opening assisting seat plate 308 of the valve body component 3, the bolt is connected with the L-shaped bending piece through threads, the bolt head is downward, the bolt head plays a role of blocking the valve plate 406, and the bolt head is moved up and down through screwing the bolt, so that the opening angle of the valve plate 406 is adjusted.

Further, as shown in fig. 15 to 16, the valve plate sealing device 5 includes a valve plate reinforcing structure in addition to the seal ring; the valve plate reinforcing structure comprises a middle plate 505, side rocking arms 501 and a supporting block 508; the middle plate 505, the herringbone plate 506 and the curled edge plate 507 form a valve plate 406, wherein the herringbone plate 506 and the middle plate 505 are fixed on the curled edge plate 507, and the middle plate 505 is positioned between the two herringbone plates 506; the supporting block 508 is fixed on the middle plate hemming plate 507, and the supporting block 508 is positioned between the herringbone plate 506 and the hemming plate 507; one end of the side rocker arm 501 is fixedly connected with the shaft 414, and the other end of the side rocker arm 501 is rotatably connected with the supporting block 508; the valve plate reinforcing structure improves the strength of the overall structure of the valve plate 406, and ensures the full contact between the valve plate 406 and the sealing ring.

The tension spring adjusting device 4 and the valve plate reinforcing structure are closely matched with each other, so that the strength of the valve plate 406 can be improved, and the tension spring adjusting device 4 and the side rocker arm 501 of the valve plate reinforcing structure cooperate to play a role in opening/closing the valve plate 406, if only the side rocker arm 501 is used for opening/closing a valve, the stability of the opening process is poor, and the service life of the isolation valve can be greatly shortened; if only the tension spring adjusting device is used, the force generated when the valve is opened can be all exerted on the tension spring 407, the tension spring 407 is easy to damage, and the valve is not stable to open and close.

Further, the seal ring is a single D-seal ring 515 (as shown in fig. 17); the single D-shaped sealing ring strip is butted into a square ring and is placed into the valve seat 306 (as shown in figures 18-20) and is obliquely inserted and fixed in the valve seat 306 through a screw. The D-shaped bulge of the single D-shaped sealing ring 515 is a hollow semicircular bulge, so that the compression performance is good, and the tightness is ensured; meanwhile, the semicircular bulge is higher, so that the defects of unsmooth pressing, pressure reduction and the like of the valve plate 406 caused by machining and assembling errors can be avoided; because the semicircular bulge is hollow, the elasticity of the part contacted with the valve plate 406 is larger, frequent friction between the valve plate 406 and the sealing ring can be avoided, and the service life of the sealing ring is prolonged; the sealing ring is fixed by a screw, so that the shock resistance is good.

Further, the isolation air valve provided by the invention further comprises an opening assisting component 6, as shown in fig. 14, wherein the opening assisting component 6 consists of a positioning tooth sleeve 601, a stud 602, an adjusting block 603 and a fastening piece 604; the positioning tooth sleeve 601 is in a circular ring shape, and gear teeth are arranged in the inner circle; the positioning tooth sleeve 601 and the stud 602 are fixedly arranged on the inner side of the right frame 305, wherein the stud 602 is positioned inside the positioning tooth sleeve 601 and is coaxial with the positioning tooth sleeve 601; the adjusting block 603 is formed by welding a cam with a through hole and a gear, and the gear is meshed with gear teeth of the positioning gear sleeve 601; the adjusting block 603 and the fastening piece 604 are sleeved on the stud 602, the gear of the adjusting block 603 is positioned in the positioning tooth sleeve 601, and the fastening piece 604 is used for fixing the adjusting block 603. When the angle of the adjusting block 603 needs to be adjusted, the fastener 604 is rotated to enable the fastener 604 to move away from the positioning tooth sleeve 601, then the gear of the adjusting block 603 is pulled out of the positioning tooth sleeve 601 along the stud 602, the adjusting block 603 is rotated to a proper angle by taking the stud 602 as an axis, then the gear of the adjusting block 603 is inserted into the positioning tooth sleeve 601, the fastener 604 is screwed, and the angle adjustment of the adjusting block 603 is completed. As shown in fig. 10-13, the adjusting block 603 of the opening assisting assembly 6 abuts against one side of the valve plate 406 when the valve is completely opened, the valve plate 406 is continuously opened, the tension spring 407 is gradually elongated, and the other side of the valve plate 406 is continuously rotated until the other side of the valve plate 406 abuts against the limiting assembly 411, and at the moment, the valve is completely opened.

The opening aid assembly 6 of the present invention has the following advantages: simple/compact structure, good anti-seismic effect, durability and difficult looseness. Existing conventional structure has the defects that: if the debugging times are more, the existing opening assisting assembly can be loosened; the anti-vibration device is not anti-vibration (the nuclear power needs to be anti-vibration) in use, and can be loosened when in vibration, and can not play a role in opening assistance.

The working process of the isolation air valve comprises the following steps:

when the isolation valve needs to be opened, firstly, the driving device 1 (an electric device or a manual device) is started, the input shaft 201 and the main radial arm 203 are driven to rotate clockwise (fig. 4) through the output shaft, the driving connecting rod 206 is driven to move upwards through the first connecting rod 204 and the first counter-force rocker arm 205, the first counter-force rocker arm 205 and the second counter-force rocker arm 207 rotate clockwise, and the first rocker arm 208 is driven to rotate anticlockwise, so that the uppermost shaft 414 is driven to rotate anticlockwise; the shafts 414 are driven to start to rotate anticlockwise simultaneously by the driven radial arms 211 and the driven connecting rods 210; as shown in fig. 10-13, the side rocker arm 501 rotates anticlockwise, gradually loosens the valve plate 406, and the upper half part of the valve plate 406 is slowly opened under the pull of the tension spring 407 (the tension spring 407 is in a stretched state when the valve plate 406 is closed), and the lower end of the valve plate 406 is still closely attached to the valve seat 306 due to the corresponding rotational connection between the side rocker arm 501 and the valve plate 406; when the upper end of the valve plate 406 contacts the shaft 414, the valve plate 406 starts to rotate around the shaft 414 until the upper part of the valve plate 406 contacts the opening assisting assembly 6, the lower part of the valve plate 406 continues to rotate under the action of the side rocker arm 501 and the tension spring 407 until the upper part contacts the limiting assembly 411, the driving device 1 is closed, and the isolation valve is opened.

When the isolation valve needs to be closed, firstly, the driving device 1 is started, the input shaft 201 is driven to rotate anticlockwise through the output shaft, the driving connecting rod 206 is driven to move downwards through the first connecting rod 204 and the first counter-force rocker arm 205, the first counter-force rocker arm 205 and the second counter-force rocker arm 207 rotate anticlockwise, the first rocker arm 208 is driven to rotate clockwise, and therefore the uppermost shaft 414 is driven to rotate clockwise; each shaft 414 is driven by the driven radial arm 211 and the driven connecting rod 210 to start to rotate clockwise; the lower part of the valve plate 406 rotates clockwise, because the valve plate 406 is under the tensile force of the side rocker arm 501 and the tension spring 407 at the same time, the upper part of the valve plate 406 leaves the opening assisting component 6, the upper end of the valve plate 406 gradually contacts the shaft 414, and at the moment, the valve plate 406 rotates clockwise by taking the shaft 414 as the center of a circle until the lower end of the valve plate 406 contacts the sealing ring; next, the upper end of the valve plate 406 gradually approaches the sealing ring under the action of the side rocker arm 501, and the tension spring 407 is gradually elongated until the valve plate 407 compresses the sealing ring, the driving device 1 is closed, and the isolation valve is closed. In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An isolation air valve is characterized by comprising a driving device (1), a connecting rod mechanism (2), a valve body assembly (3), a tension spring adjusting device (4), a valve plate sealing device (5), a valve plate (406) and a shaft (414); the driving device (1) is arranged at the outer side of the valve body assembly (3) through an electric mounting bracket (8); the connecting rod mechanism (2) is arranged in the left side of the valve body assembly (3); an output shaft of the driving device (1) is fixedly connected with an input shaft (201) of the connecting rod mechanism (2); the shaft (414) is connected with the valve plate (406) through a tension spring adjusting device (4); the shaft (414) is rotationally connected with the valve body assembly (3); the sealing ring of the valve plate sealing device (5) is arranged on a valve seat (306) in the valve body assembly (3);

the novel anti-theft lock further comprises an opening assisting component (6), wherein the opening assisting component (6) consists of a positioning tooth sleeve (601), a stud (602), an adjusting block (603) and a fastener (604); the positioning tooth sleeve (601) is in a circular ring shape, and gear teeth are arranged in the inner circle; the positioning tooth sleeve (601) and the stud (602) are fixedly arranged on the inner side of the right frame (305), wherein the stud (602) is positioned in the positioning tooth sleeve (601) and is coaxial with the positioning tooth sleeve (601); the adjusting block (603) is formed by welding a cam with a through hole and a gear, and the gear is meshed with gear teeth of the positioning gear sleeve (601); the adjusting block (603) and the fastening piece (604) are sleeved on the stud (602), the gear of the adjusting block (603) is positioned in the positioning tooth sleeve (601), and the fastening piece (604) is used for fixing the adjusting block (603).

2. The isolation damper of claim 1, wherein the valve body assembly (3) comprises a lower frame (301), a left frame (302), a middle frame (303), an upper frame (304), and a right frame (305); the lower frame (301), the left frame (302), the middle frame (303), the upper frame (304) and the right frame (305) are fixedly connected according to the positions of the lower, left, middle, upper and right, and the valve seat (306) is fixedly arranged between the middle frame (303) and the right frame (305); the left frame (302), the middle frame (303) and the right frame (305) are respectively provided with shaft holes, and the shaft holes on the right frame (305) are through holes; the bearing seat (307) is fixedly arranged on the outer side of the shaft hole of the right frame (305); the limit and opening-assisting seat plate (308) is fixedly arranged on one side, close to the right frame (305), of the middle frame (303) and on the inner side of the right frame (305).

3. An isolation damper according to claim 2, wherein the linkage mechanism (2) comprises an input shaft (201), one end of the input shaft (201) is rotationally connected with a middle frame (303) of the valve body assembly (3), and the other end of the input shaft (201) is fixedly connected with an output shaft of the driving device (1) through a shaft hole of a left frame (302) of the valve body assembly (3); one end of the main rotating arm (203) is fixedly connected with the input shaft (201), and the other end of the main rotating arm (203) is rotationally connected with one end of the first connecting rod (204); the other end of the first connecting rod (204) is rotationally connected with one end of a first counter-force rocker arm (205), a middle hole of the first counter-force rocker arm (205) is connected with one end of a driving connecting rod (206), and the other end of the first counter-force rocker arm (205) is fixedly connected with a first supporting shaft (202); the other end of the driving connecting rod (206), one end of the third connecting rod (209) and one end of the second counter-force rocker arm (207) are rotationally connected; the other end of the second counter-force rocker arm (207) is fixedly connected with a second supporting shaft (213); the other end of the third connecting rod (209) is rotationally connected with one end of the first rocker arm (208), and the other end of the first rocker arm (208) is fixedly connected with the shaft (414); each shaft (414) is fixedly connected with a passive radial arm (211), and each passive radial arm (211) is rotationally connected with the same passive connecting rod (210); the first support shaft (202) and the second support shaft (213) are both rotatably connected to the intermediate frame (303), and the second support shaft (213) is installed right above the first support shaft (202).

4. An isolation damper according to claim 3, wherein in the linkage mechanism (2), the rotational connection parts between the main swing arm (203) and the first link (204), between the first link (204) and the first counter-force rocker arm (205), between the first counter-force rocker arm (205) and the driving link (206), between the driving link (206) and the third link (209) and the second counter-force rocker arm (207), between the third link (209) and the first rocker arm (208), and between the passive swing arm (211) and the passive link (210) are connected by a pin (214), a flat washer (215) and an opening pin (216).

5. An isolation damper according to claim 1, wherein the tension spring adjusting means (4) comprises a bracket (412); one end of the bracket (412) is fixedly connected to the shaft (414), and the other end of the bracket (412) is fixedly connected with the adjusting block (417); the sliding sleeve (410) is slidably arranged in the adjusting block (417), and the sliding sleeve (410) can slide up and down in the adjusting block (417); the adjusting screw (409) is vertically arranged in the sliding sleeve (410) and is in threaded connection with the sliding sleeve (410), the sliding sleeve (410) can slide up and down in the adjusting block (417) by rotating the adjusting screw (409); the supporting ring (418) is positioned between the adjusting screw (409) and the adjusting block (417) to prevent the adjusting screw (409) from shaking left and right; one end of a tension spring (407) is fixedly connected with the valve plate (406), and the other end of the tension spring is fixedly connected with the sliding sleeve (410); the limiting component (411) is fixedly arranged on the inner side of the right frame (305), and plays a role in preventing the valve plate (406) from being opened continuously when the valve plate (406) is opened; the positioning shaft (408) passes through the adjusting block (417) and the annular groove at the lower part of the adjusting screw (409), and the tail end of the positioning shaft (408) is fixed by a nut.

6. An isolation damper according to claim 5, wherein the limiting assembly (411) comprises an L-shaped bending member and a bolt, wherein the L-shaped bending member is fixed on the limiting and opening-assisting seat plate (308) of the valve body assembly (3), the bolt is connected with the L-shaped bending member through threads, and the bolt head is downward, and the bolt head plays a role of blocking the valve plate (406).

7. An isolation damper according to claim 1, wherein the seal ring is a single D-ring (515) with a D-shaped protrusion; the D-shaped bulge is a semicircular bulge with a hollow.

8. An isolation damper according to claim 1 or 7, wherein the valve plate sealing means (5) further comprises a valve plate reinforcing structure; the valve plate reinforcing structure comprises a middle plate (505), side rocking arms (501) and supporting blocks (508); the middle plate (505), the herringbone plates (506) and the hemming plates (507) form a valve plate (406), wherein the herringbone plates (506) and the middle plate (505) are fixed on the hemming plates (507), and the middle plate (505) is positioned between the two herringbone plates (506); the support block (508) is fixed on the hemming plate (507), and the support block (508) is positioned between the herringbone plate (506) and the hemming plate (507); one end of the side rocker arm (501) is fixedly connected with the shaft (414), and the other end of the side rocker arm (501) is rotatably connected with the supporting block (508).

9. An isolation damper according to claim 1, further comprising a positioning plate (7), said positioning plate (7) being fixed to the valve body assembly (3) and being located on the same side of the valve body assembly (3) as the drive means (1).