CN217081554U

CN217081554U - Axial flow type check valve component

Info

Publication number: CN217081554U
Application number: CN202220903135.9U
Authority: CN
Inventors: 刘夏城; 王雷刚; 程铁
Original assignee: Sanmen Nuclear Power Co Ltd
Current assignee: Sanmen Nuclear Power Co Ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-07-29
Anticipated expiration: 2032-04-19

Abstract

The utility model relates to an axial-flow check valve technical field especially relates to an axial-flow check valve subassembly, contains axial-flow check valve, detection pole and endoscope, axial-flow check valve contains valve body and valve internals, the valve internals contains supporting component and valve clack, the valve wall of valve body is seted up passageway one, passageway two and passageway three; the axial flow check valve also includes a seal assembly for sealing the first, second, and third passages. The valve internals can be checked through the endoscope entering channel III; the opening and closing functions of the axial flow type check valve can be tested by the fact that the detection rod enters the first channel or the second channel to push the valve clack. Therefore, the utility model is convenient for the inspector to inspect the state of the valve inner part without detaching the axial flow type check valve; the utility model discloses still be favorable to the inspection personnel convenient and fast ground to carry out the verification of opening the closing function of axial flow check valve, be applicable to nuclear power plant's special use scene.

Description

Axial flow type check valve component

Technical Field

The utility model relates to an axial-flow type check valve technical field especially relates to an axial-flow type check valve subassembly.

Background

The axial flow type check valve is a check valve with a valve clack displaced along the central axis of a valve body, and is widely applied to nuclear power plants.

Axial flow check valves are typically mounted by both flange connection and welding. In the loop systems such as the loop system of the nuclear power plant, axial flow check valves of the welding type are generally adopted to prevent leakage.

The utility model discloses a chinese utility model patent that application number is CN201820082912.1 discloses a disc type axial-flow check valve, the valve body forms with the casting of disk seat integration, be provided with the medium circulation passageway in the valve body, the valve body is connected through spot welding with the guide holder, the guiding axle, the key, spring and disk seat coaxial arrangement, the spring is fixed in the spill uide bushing structure that the guide holder formed, be equipped with the fixed key of symmetry on the guiding axle, be equipped with the slip keyway on the guide holder, the fixed key of symmetry is identical with the slip keyway on the guide holder on the guiding axle, a disc type axial-flow check valve has been constituteed. This patent is favorable to reducing the wearing and tearing of sealed face, has improved disc type axial-flow check valve's sealing performance, is favorable to increase of service life. However, in the scheme, after welding, the valve must be cut off from the pipeline every time the state of the valve internal part is required to be confirmed, and then the valve is welded back after the confirmation, so that the process is complicated and the environment is polluted; the scheme is also not convenient for regularly checking the opening and closing functions of the check valve, the upstream system of the valve is required to be used for pressurizing and the flow is monitored at the downstream of the valve for each check so as to carry out analysis and judgment, and the test execution mode is complex and consumes long time.

SUMMERY OF THE UTILITY MODEL

The utility model discloses not enough to prior art exists, provided an axial-flow check valve subassembly, need not to pull down the axial-flow check valve alright confirm the state of valve internals, moreover, whether the check personnel of being convenient for verify opening, the closing function of check valve normal to be applicable to nuclear power plant and need prevent outer the leakage, still need the loop system of frequent inspection.

The utility model discloses a can realize through following technical scheme:

an axial flow check valve assembly comprising an axial flow check valve comprising a valve body and a valve trim, the valve trim comprising a support assembly mounted to the valve body and a valve flap movably connected to the support assembly, a detection stem and an endoscope; the valve wall of the valve body is provided with a first channel for the detection rod to enter so as to abut against the upstream side of the valve clack, a second channel for the detection rod to enter so as to abut against the downstream side of the valve clack, and a third channel for the endoscope to enter so as to inspect the valve internal part; the axial flow check valve also includes a seal assembly for sealing the first, second, and third passages.

The endoscope adopts an industrial endoscope in the prior art, and the assembling structure of the valve inner part and the valve body of the axial flow type check valve and the structure of the valve inner part are in the prior art. Specifically, the valve clack is located on the upstream side of the support assembly, and the valve clack is connected to the support assembly through a spring. When the axial flow check valve is used, when the sum of the hydraulic pressure on the downstream side of the valve clack and the spring pressure is larger than the hydraulic pressure on the upstream side, the valve clack moves to be attached to the inner wall of the valve body in the upstream direction, and the axial flow check valve is closed; when the sum of the hydraulic pressure on the downstream side of the valve clack and the spring pressure is smaller than the hydraulic pressure on the upstream side, the valve clack moves in the downstream direction to be separated from the inner wall of the valve body, and the axial flow type check valve is opened.

The detection rod is used for detecting the opening and closing functions of the axial flow type check valve, namely, whether the valve clack can be attached to the inner wall of the valve body under the action of liquid to close the axial flow type check valve or not or attached to the supporting assembly to enable the axial flow type check valve to be opened to the maximum degree when the axial flow type check valve works is simulated and verified. Before detection, the upstream system of the axial flow check valve is closed. During detection, the sealing assembly of the first channel is detached, the depth of the detection rod which can enter from the first channel during detection is compared with the insertion depth of the detection rod which enters from the first channel before the axial flow type check valve is welded and installed so as to push the valve clack to be attached to the support assembly, and whether the opening function of the axial flow type check valve is normal can be known; the closing function of the axial flow check valve is verified in the same way by the second channel.

Therefore, the utility model is convenient for the inspector to inspect the state of the valve inner part without detaching the axial flow type check valve; the utility model discloses still be favorable to the inspection personnel convenient and fast ground to carry out the verification of opening the closing function of axial flow check valve, be applicable to nuclear power plant's special use scene.

Preferably, the passageway is located between the support member and the valve flap in the direction of movement of the valve flap when the axial flow check valve is closed.

The endoscope detection valve internal part is mainly used for detecting the connection part of the valve clack and the support component. In the prior art, when the valve clack is far away from the supporting component and is attached to the inner wall of the valve body, the axial flow type check valve is closed. The preferred position of the third channel is set, so that the connecting part of the detection valve clack and the support assembly of the endoscope entering the third channel is convenient.

Preferably, the first channel, the second channel and the third channel are provided with inner ring columns at ends facing the outer side of the valve body, the valve body further comprises an outer ring column arranged at the outer side of the inner ring column, and the sealing assembly comprises an inner cover type nut for sealing the inner ring column and an outer cover type nut for sealing the outer ring column.

The inner cap nut is screwed to the inner ring column, and the outer cap nut is screwed to the outer ring column, whereby the first passage, the second passage and the third passage can be double-sealed by the inner cap nut and the outer cap nut to prevent leakage. And after the sealing is finished, a closed cavity is formed between the inner ring column and the outer ring column, when the sealing performance of the inner cover type nut is reduced to cause water in the axial flow type check valve to enter the cavity, air in the cavity is continuously compressed, and when the air in the cavity is compressed to a pressure greater than that of water flowing into the cavity, the water can be prevented from continuously entering the cavity, so that the external leakage can be further prevented.

Preferably, the valve wall of the valve body is further provided with a water injection hole positioned on the downstream side of the valve clack.

The valve clack can strike the valve body in the use, and then leads to valve clack or valve body to collide with impairedly, and detection personnel can detect impaired circumstances through the endoscope, but can appear that detection personnel are difficult to judge whether the circumstances of slight damage influence the non return effect, and then whether difficult to confirm that the axial-flow check valve that will weld cuts down in order to maintain. This preferably the valve wall of valve body has seted up the water injection hole, when the above-mentioned condition of being difficult to judge appears, the testing personnel can carry out the experiment through this water injection hole in order to judge, during the experiment, close axial flow check valve's upstream system earlier, and close other valves in the axial flow check valve low reaches in order to shutoff axial flow check valve's low reaches, then, water injection is in order to exert pressure to the valve clack through the water injection hole in to axial flow check valve for axial flow check valve is in the closed condition, then, looks over the water condition through the upper reaches at axial flow check valve, in order to judge slight damage whether influence the non return effect.

Preferably, the second channel and the water injection hole are offset in the longitudinal direction thereof.

According to the stress analysis, the smaller the acute angle included angle between the length direction of the second passage and the axis of the axial flow type check valve is, the greater the pressure of the detection rod entering the second passage on the valve flap can be used for enabling the valve flap to move along the axis direction of the axial flow type check valve, so that a worker can push the valve flap more easily, and therefore, the side, facing the outside of the axial flow type check valve, of the second passage is close to the downstream end of the axial flow type check valve. The water injection hole also needs to be arranged close to the downstream end of the axial flow type check valve, so that the state of liquid flowing back from the downstream can be better simulated in the check effect test of the valve clack, and the test result is more real and reliable. The second channel and the water injection hole are preferably staggered in the respective length direction, so that the interference between the second channel and the water injection hole is avoided.

Preferably, the support assembly comprises an avoidance hole for the detection rod to pass through.

Therefore, the detection rod entering the second passage is prevented from being blocked by the supporting assembly, and the valve clack cannot be pushed by the detection rod.

Preferably, the detection rod comprises a graduated rod part for entering the first channel or the second channel and a connecting column part connected to one end of the upper range limit of the graduated rod part, and the outer diameter of the connecting column part is larger than the inner diameter of the first channel or the second channel.

The rod part of the scale is provided with scales, so that a detection person can more quickly obtain the depth of the detection rod entering the first channel or the second channel. The connecting column part is connected to one end of the upper range limit of the scale rod part, and the outer diameter of the connecting column part is larger than the inner diameter of the first channel or the second channel, so that the phenomenon that the reading is not consistent with the reality due to the fact that a detection person inserts the upper range limit end of the scale rod part into the first channel or the second channel is avoided, and misjudgment is avoided.

Preferably, the valve body is transversely arranged, and the first channel, the second channel, the third channel and the water injection hole are arranged on the upper part of the valve body.

Therefore, the valve is beneficial to avoiding blockage caused by the fact that impurities in flowing liquid sink and accumulate when the first channel, the second channel, the third channel or the water injection hole are arranged at the lower part of the valve body.

The utility model discloses following beneficial effect has:

1. the utility model discloses be convenient for the inspection personnel under the condition of not pulling down axial-flow type check valve, use the state of endoscope inlet channel three with inspection valve internals to and use check rod inlet channel one and the passageway two to inspect the opening and closing function of axial-flow type check valve, be applicable to the special use scene of nuclear power plant.

2. Passageway one, passageway two and passageway three can carry out double sealing by inner cup type nut and enclosing cover type nut, are favorable to preventing that the internal liquid of valve leaks outward. Furthermore, after sealing is completed, a sealed cavity is formed between the inner ring column and the outer ring column, when the sealing performance of the inner cover type nut is reduced to cause water in the axial flow type check valve to enter the cavity, air in the cavity is continuously compressed, when the air in the cavity is compressed to a pressure greater than that of water flowing into the cavity, the water can be prevented from entering the cavity continuously, and external leakage can be further prevented.

3. The valve wall of the valve body is also provided with a water injection hole positioned on one side of the downstream of the valve clack. The testing personnel can carry out the water injection experiment through this water injection hole to the non return effect of inspection axial-flow check valve. Furthermore, the second channel and the water injection hole are staggered in the respective length direction, so that the mutual interference between the water injection hole and the second channel is avoided.

4. The measuring rod contain scale rod portion and connect in the web site portion of the range upper limit one end of scale rod portion, the external diameter of web site portion is greater than the internal diameter of passageway one or passageway two. Therefore, the graduated rod part with the graduation facilitates the detection personnel to more quickly obtain the depth of the detection rod entering the first channel or the second channel; the connecting column part is connected to one end of the upper range limit of the scale rod part, and the outer diameter of the connecting column part is larger than the inner diameter of the first channel or the second channel, so that the phenomenon that the reading is not consistent with the reality due to the fact that a detection person inserts the upper range limit end of the scale rod part into the first channel or the second channel is avoided, and misjudgment is avoided.

Drawings

Fig. 1 is a front sectional view of the present invention;

fig. 2 is a cross-sectional view of the present invention, taken along the axis passing through the third passage;

fig. 3 is a partially enlarged view of the area a in fig. 1.

In the figure: the endoscope comprises a 1 axial flow type check valve, a 11 valve body, a 111 channel I, a 112 channel II, a 113 channel III, a 114 water injection hole, a 12 valve inner part, a 121 supporting component, a 1211 avoiding hole, a 122 valve clack, a 13 sealing component, a 131 inner cover type nut, a 132 outer cover type nut, a 14 inner ring column, a 15 outer ring column, a 2 detection rod, a 21 graduated rod part, a 22 connecting column part and a 3 endoscope.

Detailed Description

The following is a detailed embodiment of the present invention and is described with reference to the accompanying drawings, which are not intended to limit the present invention, and after reading the present specification, those skilled in the art can make modifications to the present embodiment as needed without inventive contribution, but only protected by the patent laws within the scope of the claims of the present invention.

An axial flow check valve assembly, as shown in fig. 1 and 2, includes an axial flow check valve 1, a detection rod 2, and an endoscope 3. The axial flow check valve 1 includes a valve body 11 and a valve trim 12, and the valve trim 12 includes a support member 121 mounted to the valve body 11, and a valve flap 122 movably connected to an upstream side of the support member 121 by a spring. When the sum of the hydraulic pressure on the downstream side of the valve flap 122 and the spring pressure is larger than the hydraulic pressure on the upstream side, the valve flap 122 moves in the upstream direction to abut against the inner wall of the valve body 11, and the axial flow type check valve 1 closes; when the sum of the hydraulic pressure on the downstream side of the valve flap 122 and the spring pressure is smaller than the hydraulic pressure on the upstream side, the valve flap 122 moves in the downstream direction to be detached from the inner wall of the valve body 11, and the axial flow type check valve 1 opens.

The check rod 2 is used to check the opening and closing function of the axial flow check valve 1. The valve wall of the valve body 11 is provided with a first passage 111, the first passage is used for allowing the detection rod 2 to enter to abut against the upstream side of the valve clack 122, the detection rod 2 entering the first passage 111 pushes the valve clack 122 in the downstream direction, and the process that the valve clack 122 moves in the downstream direction under the action of upstream hydraulic pressure is simulated. The valve wall of the valve body 11 is further provided with a second passage 112, the second passage is used for allowing the detection rod 2 to enter to abut against the downstream side of the valve clack 122, the detection rod 2 entering the second passage 112 pushes the valve clack 122 in the upstream direction, and the process that the valve clack 122 moves in the upstream direction under the action of downstream hydraulic pressure is simulated. Preferably, the support assembly 121 includes an avoidance hole 1211 for allowing the detection rod 2 to pass through, so as to prevent the detection rod 2 entering the second channel 112 from being blocked by the support assembly 121 and further being unable to abut against the valve flap 122.

Before detecting the opening and closing functions of the axial flow type check valve 1, an upstream system of the axial flow type check valve 1 is closed. Then, the sealing component 13 of the first passage 111 is detached, the depth of the detection rod 2 which can enter from the first passage 111 is compared with the insertion depth of the detection rod 2 which enters from the first passage 111 before the axial flow type check valve 1 is welded and installed so as to push the valve clack 122 to be attached to the support component 121, and whether the opening function of the axial flow type check valve 1 is normal can be known; the closing function of the axial check valve 1 is verified in the same way by the second passage 112.

Further, the detection rod 2 comprises a scale rod part 21 for entering the first channel 111 or the second channel 112, and the scale rod part 21 is provided with scales, so that a detection person can more quickly obtain the depth of the detection rod 2 entering the first channel 111 or the second channel 112. The detection rod 2 further comprises a connecting column part 22 connected to one end of the upper range limit of the scale rod part 21, and the outer diameter of the connecting column part 22 is larger than the inner diameter of the first channel 111 or the second channel 112, so that the situation that a detection person inserts the upper range limit end of the scale rod part 21 into the first channel 111 or the second channel 112 to cause that reading is inconsistent with reality is avoided, and misjudgment is avoided.

The endoscope 3 is used for viewing the valve trim 12, and the endoscope 3 is an industrial endoscope in the prior art. The valve wall of the valve body 11 is further opened with a third channel 113 for the endoscope 3 to enter for inspecting the valve trim 12. Specifically, the endoscope 3 mainly looks at the joint of the valve flap 122 and the support assembly 121, and thus the position of the channel three 113 on the valve body 11 is set as follows: when the axial flow check valve 1 is closed, the third passage 113 is located between the support member 121 and the valve flap 122 in the moving direction of the valve flap 122.

Before viewing the valve trim 12, the upstream system of the axial flow check valve 1 is closed, then the sensing rod 2 is moved into the second channel 112 and the flap 122 is pushed in the upstream direction to the upstream side of the third channel 113, at which time the third channel 113 is located between the flap 122 and the support member 121 in the moving direction of the flap 122, and then the endoscope 3 is moved into the third channel 113, so that the junction of the flap 122 and the support member 121 can be viewed.

Valve clack 122 can strike valve body 11 in the use, and then leads to valve clack 122 or valve body 11 to collide with impaired, and detection personnel can detect impaired circumstances through endoscope 3, but can appear that detection personnel are difficult to judge whether the circumstances of slight damage influence the non return effect, and then whether difficult to confirm that it gets off in order to maintain with welded axial flow check valve 1 cutting. In order to solve the problem, the valve wall of the valve body 11 is further provided with a water injection hole 114 located at the downstream side of the valve flap 122, and when the above-mentioned detector is difficult to determine whether slight damage affects the check effect, the detector can perform a water injection experiment through the water injection hole 114 to determine.

In the experiment, the upstream system of the axial flow type check valve 1 is closed, other valves downstream of the axial flow type check valve 1 are closed to block the downstream of the axial flow type check valve 1, then water is injected into the axial flow type check valve 1 through the water injection hole 114 to press the valve clack 122, so that the axial flow type check valve 1 is in a closed state, and then the water outlet condition is checked upstream of the axial flow type check valve 1 to judge whether the slight damage affects the check effect.

According to the force analysis, the smaller the acute included angle between the length direction of the second passage 112 and the axis of the axial flow type check valve 1, the greater the pressure of the detection rod 2 entering the second passage 112 on the valve flap 122 can be used to move the valve flap 122 along the axis direction of the axial flow type check valve 1, so that the worker can push the valve flap 122 more easily, and therefore, the side of the second passage 112 facing the outside of the axial flow type check valve 1 can be close to the downstream end of the axial flow type check valve 1. The water injection hole 114 also needs to be arranged close to the downstream end of the axial flow type check valve 1, so that the backflow state of liquid from the downstream can be better simulated in the check effect test of the valve clack 122, and the water injection test result is more real and reliable. In order to avoid interference between the second channel 112 and the water injection hole 114, it is preferable that the second channel 112 and the water injection hole 114 are offset in their respective longitudinal directions.

The water injection holes 114 have a large diameter so that the water flow during water injection can simulate the water flow during the backflow of the downstream liquid. The water injection hole 114 may be sealed by a screw post screwed to an inner wall of the water injection hole 114.

The inner diameters of the first channel 111, the second channel 112 and the third channel 113 are smaller so as to reduce the influence of the arrangement of the first channel 111, the second channel 112 and the third channel 113 on the strength of the valve body 11. When the inner diameters of the first passage 111, the second passage 112, and the third passage 113 are small, if the stud is screwed to the inner wall of the passage with the small inner diameter to perform sealing, the outer diameter of the stud is small, and the stud is easily damaged in the use process.

To solve the problem, as shown in fig. 3, the ends of the first channel 111, the second channel 112 and the third channel 113 facing the outside of the valve body 11 are all provided with an inner ring column 14 with a larger outer diameter, and the valve body 11 further comprises an outer ring column 15 arranged on the outside of the inner ring column 14; the axial flow check valve 1 includes a sealing assembly 13, the sealing assembly 13 including an inner cap-type nut 131 for screw-sealing the inner ring post 14 and an outer cap-type nut 132 for screw-sealing the outer ring post 15. Therefore, the first channel 111, the second channel 112 and the third channel 113 are sealed by the inner cover type nut 131 and the outer cover type nut 132 in a double way, and leakage is prevented.

Further, the top of the outer ring column 15 is higher than the inner cap nut 131, after sealing is completed, a sealed cavity exists between the inner ring column 14 and the outer ring column 15, when the sealing performance of the inner cap nut 131 is reduced to cause water in the axial flow type check valve 1 to enter the cavity, air in the cavity is continuously compressed, and when the air in the cavity is compressed to a pressure greater than that of water entering the cavity, water flow can be prevented from entering the cavity, so that external leakage can be further prevented.

This axial flow check valve 1's valve body 11 is horizontal installation, for avoiding passageway one 111, passageway two 112, passageway three 113 or water injection hole 114 to sink because of the impurity in the liquid that flows through and pile up and block up, passageway one 111, passageway two 112, passageway three 113 and water injection hole 114 all set up in the upper portion of valve body 11.

The embodiments of the invention described above and shown in the drawings are intended as examples only and do not limit the invention. Those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the present disclosure, and such modifications or substitutions are intended to be included within the scope of the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The purpose of the utility model is completely and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. An axial flow check valve assembly comprising an axial flow check valve (1), the axial flow check valve (1) comprising a valve body (11) and a valve trim (12), the valve trim (12) comprising a support member (121) mounted to the valve body (11) and a flap (122) movably connected to the support member (121), characterized by further comprising a detection rod (2) and an endoscope (3); the valve wall of the valve body (11) is provided with a first channel (111) facing the upstream side for the detection rod (2) to enter to abut against the valve clack (122), a second channel (112) facing the downstream side for the detection rod (2) to enter to abut against the valve clack (122), and a third channel (113) for the endoscope (3) to enter to inspect the valve inner member (12); the axial flow check valve (1) further comprises a sealing assembly (13) for sealing the first (111), second (112) and third (113) channels.

2. An axial flow check valve assembly according to claim 1, wherein the channel three (113) is located between the support member (121) and the valve flap (122) in the direction of movement of the valve flap (122) when the axial flow check valve (1) is closed.

3. The axial flow check valve assembly of claim 1, wherein the ends of the first (111), second (112) and third (113) channels facing the outside of the valve body (11) are each provided with an inner ring post (14), the valve body (11) further comprises an outer ring post (15) disposed on the outside of the inner ring post (14), and the sealing assembly (13) comprises an inner cap-type nut (131) for sealing the inner ring post (14) and an outer cap-type nut (132) for sealing the outer ring post (15).

4. The axial flow check valve assembly of claim 1, wherein the valve wall of the valve body (11) is further provided with a water injection hole (114) located on a downstream side of the valve flap (122).

5. The axial flow check valve assembly of claim 4, wherein the second channel (112) is offset from the fill hole (114) in the respective lengthwise direction.

6. The axial check valve assembly of claim 1, wherein the support assembly (121) comprises an avoidance hole (1211) for the passage of the detection rod (2).

7. The axial flow check valve assembly of claim 1, wherein the check rod (2) comprises a scale rod portion (21) for entering the first channel (111) or the second channel (112), and a connection column portion (22) connected to one end of the scale rod portion (21) at the upper range limit, wherein the outer diameter of the connection column portion (22) is larger than the inner diameter of the first channel (111) or the second channel (112).

8. The axial flow check valve assembly of claim 4, wherein the valve body (11) is laterally disposed, and the first passage (111), the second passage (112), the third passage (113) and the water injection hole (114) are disposed at an upper portion of the valve body (11).