CN216344245U

CN216344245U - Nested pull rod mechanism

Info

Publication number: CN216344245U
Application number: CN202122613840.3U
Authority: CN
Inventors: 王鑫龙; 丁礼俊; 闵玉龙; 梅飞飞; 邓力丰
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-04-19
Anticipated expiration: 2031-10-28

Abstract

The utility model discloses a nested pull rod mechanism, which comprises a supporting sleeve; the connecting assembly is axially movably arranged in the supporting sleeve and is fixedly connected with the pneumatic rod, and the connecting assembly comprises a nut connected with the pneumatic rod and a screw connected with the nut; the pneumatic rod driving device further comprises a driving component which is connected with the screw rod and used for driving the connecting component to move axially so as to drive the pneumatic rod to reciprocate axially. The nested pull rod mechanism is simple in structure and good in convenience, a single operator can operate to load and unload the spring force of the valve, the position of the spring can be guaranteed not to change relatively in the operation process, the nested pull rod mechanism can obviously improve the working efficiency, and the irradiation dose of the operator is reduced.

Description

Nested pull rod mechanism

Technical Field

The utility model relates to the technical field of nuclear power valve maintenance, in particular to a nested pull rod mechanism.

Background

As shown in fig. 1, the spring is an important part of the pneumatic control valve, and cooperates with the compressed gas to balance the valve at any opening, and in order to maintain good sealing performance of the valve, the spring is required to have a certain amount of compression in a de-energized state, so that the loading and releasing of the spring force is a pre-step necessary for maintenance of the pneumatic control valve, and can be normally accomplished by rotating the spring adjusting screw. However, some regulating valves have a special design, which makes it difficult to easily perform the process. Such as a pressurizer spray valve in a CPR1000 set, which adopts a dual spring structure, the pre-compression amount of the spring is about 100mm, but the spring force cannot be completely removed by the spring adjusting screw because the spring adjusting screw is short. In the past, 3 to 4 persons are needed to install the screw rod from the diaphragm box (the position of the icon 101) during maintenance, the screw rod is adjusted to balance the spring force, the time consumption is long, and the total exposure dose is relatively greatly increased. Because the spring chamber of this valve is comparatively compact, in the in-process of using many lead screws balanced spring force, because can't keep complete step unanimous, cause the spring very easily to be pressed and deflect and then produce the contact with the spring chamber. This contact creates friction during valve opening and closing that can degrade valve turndown performance, and this quality defect is often unacceptable and requires re-maintenance to be eliminated.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a nested pull rod mechanism.

The technical scheme adopted by the utility model for solving the technical problems is as follows: constructing a nested pull rod mechanism, which comprises a supporting sleeve; the connecting assembly is axially movably arranged in the supporting sleeve and is fixedly connected with the pneumatic rod, and the connecting assembly comprises a nut connected with the pneumatic rod and a screw connected with the nut; the pneumatic rod driving device further comprises a driving component which is connected with the screw rod and used for driving the connecting component to move axially so as to drive the pneumatic rod to reciprocate axially.

Preferably, the nut is in threaded connection with the pneumatic rod, and a movable gap is reserved between the outer periphery of the nut and the inner periphery of the support sleeve.

Preferably, the nut comprises a cylindrical part and a main body part, wherein the inner cavity of the cylindrical part is communicated with the main body part;

the cylindrical part is in threaded connection with the pneumatic rod; the main body part is in threaded connection with the screw.

Preferably, the screw comprises a first cylindrical section and a second cylindrical section which are connected, and the first cylindrical section and the second cylindrical section are coaxially arranged; the first cylindrical section is connected with the main body portion.

Preferably, the driving assembly comprises a sleeve body sleeved on the periphery of the second cylindrical section, and a predetermined gap is reserved between the upper surface of the sleeve body and the lower surface of the main body part;

the outer periphery of the sleeve body is in threaded connection with the inner periphery of the supporting sleeve.

Preferably, the periphery of the lower end of the second cylindrical section is provided with a supporting part;

the supporting part is provided with a gasket at the upper periphery, the second cylindrical section is located the upper side of the gasket reaches a section of peripheral sleeve between the lower sides of the inner top surfaces of the sleeve bodies is provided with a rolling bearing in a sleeved mode.

Preferably, the driving assembly further comprises a connector arranged at the opening of the sleeve body;

the connector includes the connector main part of upside, with connector main part downside is connected and is used for the connecting portion be connected with the power spare.

Preferably, the connector main body faces one side of the second cylindrical section and is provided with a mounting groove matched with the supporting part.

Preferably, the power member comprises a ratchet sleeve.

Preferably, the support sleeve is a metal piece.

The implementation of the utility model has the following beneficial effects: the nested pull rod mechanism is simple in structure and good in convenience, a single operator can operate to load and unload the spring force of the valve, the position of the spring can be guaranteed not to change relatively in the operation process, the nested pull rod mechanism can obviously improve the working efficiency, and the irradiation dose of the operator is reduced.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of a portion of a pneumatic regulator valve;

fig. 2 is a schematic structural view of the nested draw bar mechanism of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.

It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 2, the nested pull rod mechanism of the present invention includes a support sleeve 1; but axial displacement installs in support sleeve 1 and is used for with pneumatic rod 103 fixed connection's coupling assembling 2, coupling assembling 2 includes the nut 21 of being connected with pneumatic rod 103, the screw rod 22 of being connected with nut 21, still includes and is connected with screw rod 22 and is used for driving coupling assembling 2 axial displacement in order to drive pneumatic rod 103 axial reciprocating motion's drive assembly 3.

In this embodiment, the support sleeve 1 is substantially cylindrical, such as a cylindrical structure, and the diameter of the upper portion thereof may be slightly larger than that of the middle-lower portion thereof, so that the upper portion thereof can accommodate a spring adjusting screw or the like. Preferably, the support sleeve 1 is a unitary structure, which may be a metal member, such as stainless steel or carbon steel. During operation, the upper part of the support sleeve 1 is in contact with the yoke 102.

Preferably, the nut 21 is screwed to the pneumatic rod 103, and the outer circumference of the nut 21 is spaced from the inner circumference of the support sleeve 1 to facilitate axial movement.

Preferably, the nut 21 includes a cylindrical portion 211 and a main body portion 212, the inner cavity of which communicates with each other, the cylindrical portion 211 and the main body portion 212 are coaxially disposed, the cylindrical portion 211 is screwed with the pneumatic rod 103, for example, the inner cavity peripheral wall of the cylindrical portion 211 is provided with an internal thread to connect with an external thread at the lower part of the pneumatic rod 103; the main body 212 is screwed to the screw 22, and if the peripheral wall of the through cavity of the main body 212 is provided with an internal thread, the upper end of the screw 22 is provided with an external thread, and the two are screwed and fixed.

In this embodiment, the screw 22 may include a first cylindrical section 221 and a second cylindrical section 222 connected to each other, the first cylindrical section 221 and the second cylindrical section 222 are coaxially disposed, the first cylindrical section 221 is located at the upper portion of the second cylindrical section 222, and preferably, the diameter of the first cylindrical section 221 is smaller than that of the second cylindrical section 222; the first cylindrical section 221 is connected to the main body 212 and is screwed.

In this embodiment, the driving assembly 3 includes a sleeve 31 disposed around the second cylindrical section 222, and the sleeve 31 is substantially cylindrical, and may be made of metal, such as stainless steel or carbon steel, and the material of the metal can be selected according to actual requirements.

A predetermined gap is left between the upper surface of the sheath body 31 and the lower surface of the main body 212, and the outer periphery of the sheath body 31 is in threaded connection with the inner periphery of the support sleeve 1. The inner circumference of the support sleeve 1 may be provided with internal threads in its entire section or may be provided with internal threads in a certain region.

Preferably, the periphery of the lower end of the second cylindrical section 222 is provided with a support portion 223, the upper periphery of the support portion 223 is provided with a gasket 32, and a section of the periphery of the second cylindrical section 222, which is located between the upper side of the gasket 32 and the lower side of the inner top surface of the sleeve body 31, is sleeved with a rolling bearing 33, so that the radial shear force between the connecting assembly 2 and the driving assembly 3 can be reduced.

Preferably, the driving assembly 3 further includes a connector 34 disposed at the opening of the sleeve 31, and the connector 34 includes a connector main body 341 on the upper side and a connecting portion 342 connected to the lower side of the connector main body 341 and used for connecting with a power component.

Preferably, a mounting groove 3411 for engaging with the supporting portion 223 is formed on a side of the connector main body 341 facing the second cylindrical section 222, wherein when the mounting groove 3411 is not engaged with the supporting portion 223, a predetermined gap is left between an upper surface of the connector main body 341 and a lower surface of the supporting portion 223, and the predetermined gap is smaller than the predetermined gap, so that when the mounting groove 3411 is engaged with the supporting portion 223, the upper surface of the sleeve 31 is not abutted against the lower surface of the nut 21, and thus the driving assembly 3 can drive the nut 21 of the connecting assembly 2 to be screwed into or out of the pneumatic rod 103.

In this embodiment, the supporting portion 223 may be an outer hexagon head, the mounting groove 3411 may be an inner hexagon groove, and the two may be detachably connected and fixed, but of course, the supporting portion 223 may also be a square head, etc. as long as it is not a smooth cylinder. It can be understood that the supporting portion 223 is connected with the mounting groove 3411 in a snap-fit manner.

Preferably, the power member includes a ratchet sleeve, and in this embodiment, the connecting portion 342 may be of an outer hexagonal head structure to be assembled with the ratchet sleeve, and the ratchet sleeve can drive the driving assembly 3 to rotate rapidly, so as to drive the pneumatic rod 103 to move up and down axially.

This nested formula pull rod mechanism adopts nested formula structure: the pulled piece (the pneumatic rod 103) does not bear circumferential rotating force and only bears axial pulling force, so that the spring is prevented from deflecting in the compression process, and the valve is prevented from shaking.

Compared with the prior art, the nested pull rod mechanism has the following beneficial effects: the working efficiency is improved, and the construction period of 1 hour is saved in each work; a single job reduction of collective radiation dose of about 0.3 mSv; the working process is stable, the spring cannot deviate, and the stability of the valve is improved.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A nested drawbar mechanism, comprising a support sleeve (1); the connecting assembly (2) is axially movably arranged in the supporting sleeve (1) and is fixedly connected with a pneumatic rod (103), and the connecting assembly (2) comprises a nut (21) connected with the pneumatic rod (103) and a screw rod (22) connected with the nut (21); the device also comprises a driving component (3) which is connected with the screw rod (22) and used for driving the connecting component (2) to axially move so as to drive the pneumatic rod (103) to axially reciprocate.

2. The nested draw bar mechanism according to claim 1, wherein the nut (21) is threaded with the pneumatic rod (103) and the outer circumference of the nut (21) is at a moving clearance from the inner circumference of the support sleeve (1).

3. The nested draw bar mechanism of claim 2, wherein the nut (21) comprises a cylindrical portion (211) and a body portion (212) having an inner cavity in communication, the cylindrical portion (211) being disposed coaxially with the body portion (212);

the cylindrical part (211) is in threaded connection with the pneumatic rod (103); the main body part (212) is in threaded connection with the screw (22).

4. The nested draw bar mechanism of claim 3, wherein the screw (22) comprises a first cylindrical section (221) and a second cylindrical section (222) connected, the first cylindrical section (221) and the second cylindrical section (222) being coaxially arranged; the first cylindrical section (221) is connected to the main body portion (212).

5. The nested draw bar mechanism of claim 4, wherein the driving assembly (3) comprises a sheath body (31) sleeved on the outer periphery of the second cylindrical section (222), and a predetermined gap is left between the upper surface of the sheath body (31) and the lower surface of the main body part (212);

the outer periphery of the sleeve body (31) is in threaded connection with the inner periphery of the supporting sleeve (1).

6. The nested draw bar mechanism of claim 5, wherein the second cylindrical section (222) is peripherally provided at its lower end with a support (223);

supporting part (223) go up week and be equipped with gasket (32), second cylindric section (222) are located gasket (32) upside arrives one section periphery cover between the top surface downside is equipped with antifriction bearing (33) in the cover body (31).

7. The nested draw bar mechanism of claim 6, wherein the drive assembly (3) further comprises a connector (34) provided at an opening of the housing (31);

the connector (34) comprises a connector main body (341) on the upper side, and a connecting part (342) connected with a power part is connected with the lower side of the connector main body (341).

8. The nested draw bar mechanism of claim 7, wherein the side of the connector body (341) facing the second cylindrical section (222) is provided with a mounting groove (3411) cooperating with the support (223).

9. The nested draw bar mechanism of claim 7, wherein the power member comprises a ratchet sleeve.

10. The nested draw bar mechanism according to any of claims 1-9, wherein the support sleeve (1) is a metal piece.