CN217033012U

CN217033012U - Axial-flow check valve opens and close frock under area under low temperature operating mode

Info

Publication number: CN217033012U
Application number: CN202123178327.2U
Authority: CN
Inventors: 邵学军; 张琳; 陈文鑫; 郝宏达; 王忠强; 李鹏飞; 王军刚; 张娜; 哈华峰
Original assignee: LANZHOU HIGH PRESSURE VALVE CO Ltd
Current assignee: LANZHOU HIGH PRESSURE VALVE CO Ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-07-22
Anticipated expiration: 2031-12-14

Abstract

The utility model provides a frock is opened and close in area under axial flow check valve low temperature operating mode, blind plate shutoff axial flow check valve both ends make axial flow check valve form confined space, and the blind plate center of one end link up sealed installation ejector pin, and this ejector pin one end is connected with the guide bar of check valve, and the other end and distance rod contact are connected, and the contact surface on the distance rod is the inclined plane, the distance rod is installed on the support frame subassembly, its and the output shaft of installing the cylinder on the support frame subassembly. The utility model has the advantages of fast, convenient and labor-saving clamping, and provides basis for reliability design, reliability prediction, improvement of new product quality, determination of test conditions and the like; the efficiency of the valve test is improved, and the production cost of the valve is reduced. The whole test process realizes the working condition simulation, automatic opening and closing and simple operation.

Description

Axial-flow check valve opens and close frock under area under low temperature operating mode

Technical Field

The utility model relates to the technical field of research and development of new products of valves, in particular to a tool for starting and stopping an axial flow check valve under pressure under a low-temperature working condition.

Background

In recent years, with the rapid development of the petrochemical industry in China, the demand of LNG low-temperature valves is rapidly increased. For a long time, these valves with high technical content and high added value have been dependent on importation, high price and long manufacturing cycle. The market demand for valves in the country will grow rapidly.

After the LNG ultralow-temperature axial flow type check valve localization project is successfully implemented, the situation that the valve depends on import by 100% is thoroughly changed, the localization of the valve above 95% can be realized, the valve is independently designed, manufactured, installed and operated, and the problem that the supply of valve maintenance spare parts and technical support are difficult is solved. Therefore, the traditional processing technology needs to be continuously improved and perfected, and the reasonable utilization of the tool clamp can not only improve the production efficiency, but also save the cost.

In the valve development process, 2000 times of complete machine low-temperature fatigue life tests of the valve are carried out at a test temperature of-196 ℃. During the test, the valve is fully opened by using a special tool, and then the spring is reset to close the valve as one mechanical cycle. And performing a low-temperature-room-temperature circulating sealing test after each 100 times of low-temperature fatigue life tests of the whole valve. The life test is a method for researching the life characteristics of a product, is one of the most important items in the reliability test, and is to put the product under specific test conditions to investigate the rule of the failure of the product changing along with time

SUMMERY OF THE UTILITY MODEL

The utility model provides a pressurized opening and closing tool for an axial flow type check valve under a low-temperature working condition, which can provide real and reliable test data in the research and development process of a new product of the axial flow type check valve, verify the internal quality of the valve and reduce the research and development cost of the valve.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a frock is opened and close in area under axial flow type check valve low temperature operating mode, 1 both ends of blind plate shutoff axial flow type check valve make axial flow type check valve form confined space, and the blind plate center of one end link up sealed installation ejector pin, and this ejector pin one end and check valve's guide bar are connected, and the other end and distance rod contact are connected, and the contact surface on the distance rod is the inclined plane, the distance rod is installed on the support frame subassembly, its and the output shaft of installing the cylinder on the support frame subassembly.

The inclined plane on the thrust rod is a 14-degree inclined plane.

The end surface of the contact end of the ejector rod and the thrust rod is of a spherical structure.

The thrust rod is provided with an anti-rotation device, and the structure of the thrust rod is as follows: an anti-rotation groove is formed in the back face of the thrust rod, a guide pin is mounted on the support frame assembly, and the guide pin is matched with the anti-rotation groove in position.

Compared with the prior art, the utility model has the beneficial effects that: 1) the inherent quality problem of valve products cannot be completely measured through a common valve delivery pressure test and part machining size precision and finish inspection; 2) the valve life test is carried out by the utility model, and the valve product is put under a specific simulated working condition for cycle test, so that the service life characteristics, failure rule, failure rate, average service life and various failure modes which can appear in the service life test process of the valve can be known. 3) By combining with failure analysis, main failure mechanisms causing failure, such as design structure rationality, sealing performance, processing quality, material selection, assembly quality and the like, can be further clarified; 4) the design of the utility model provides basis for the reliability design and reliability prediction of the axial flow check valve, the improvement of the quality of new products, the determination of test conditions and the like.

Drawings

FIG. 1 is a schematic assembly of the present invention;

FIG. 2 is a schematic diagram of the structure of the blind plate of the present invention;

FIG. 3 is a schematic view of the support frame assembly of the present invention;

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a schematic view of the ejector pin structure of the present invention;

FIG. 6 is a schematic view of a thrust rod of the present invention;

fig. 7 is a right side view of fig. 6.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to specific embodiments.

Referring to fig. 1-7, in the axial-flow check valve on-off tool under low temperature, a blind plate 2 blocks two ends of a check valve 1, so that the check valve 1 forms a closed space, pressure needs to be injected into a valve body in the test process, and the use condition of the valve on the device is simulated; the center of the blind plate 2 at one end is penetrated and hermetically provided with an ejector rod 7, one end of the ejector rod 7 is connected with a guide rod of the check valve 1, the other end of the ejector rod 7 is in contact connection with a thrust rod 5, a contact surface on the thrust rod 5 is an inclined surface, and the thrust rod 5 is arranged on a support frame assembly 3 and connected with an output shaft of a cylinder 4 arranged on the support frame assembly 3. The cylinder 4 is used for driving the thrust rod 5 to push the ejector rod 7 to do reciprocating motion, and a 14-degree inclined plane of the thrust rod and the ejector rod generate two motion directions of transverse direction and longitudinal direction to realize the opening and closing of the valve; when the valve is opened, the valve guide rod is pushed by the ejector rod 7 to separate the valve clack from the valve seat so as to achieve the opening purpose, when the valve is closed, the valve clack is attached to the valve seat by the spring in the valve so as to achieve the closing, and the steps are repeated to realize the cyclic opening and closing test of the valve;

when the ejector rod 7 is installed in the opening of the blind plate 2, the pressing plate 6 and the PCTFE are used for sealing, and the valve is tested under the condition of low temperature and under pressure.

The inclined plane on the thrust rod 5 is a 14-degree inclined plane. The design of the inclined plane can meet the requirement of opening the valve and also meet the requirement of minimum friction force in the contact process of the ejector rod 7 and the inclined plane, and the cylinder drives the thrust rod to push the ejector rod to reciprocate so as to open and close the valve.

The end surface of the contact end of the top rod 7 and the thrust rod 5 is of a spherical structure. The contact surface with 14 inclined planes is reduced, so that the friction force of the tool in the use process is reduced, the tool is smoother in the use process, and the clamping phenomenon is avoided.

The thrust rod 5 is provided with an anti-rotation device, and the structure of the thrust rod is as follows: an anti-rotation groove is formed in the back of the thrust rod 5, a guide pin is mounted on the support frame assembly 3, and the guide pin is matched with the anti-rotation groove in position. The anti-rotation groove moves along the guide groove, so that the thrust rod does not rotate in the movement process, the operation is stable, and no blocking exists.

The support piece assembly comprises a vertically placed support plate, a plane is arranged at the upper end of the support plate and used for installing the air cylinder 4, a guide pin installation frame 8 is arranged at the lower end of the support plate, a guide pin is installed on the inner side of the guide pin installation frame 8, and when the thrust rod 5 reciprocates, the guide pin is guaranteed to be in an anti-rotation groove in the back face of the thrust rod.

The utility model drives the thrust rod through the air cylinder, promotes the movement of the ejector rod to jack the valve clack, realizes the closing of the valve through the spring force in the valve, simulates the cycle switch test of the valve under the low-temperature working condition, verifies the service life of each relevant part of the valve under the low-temperature severe working condition, is fast, convenient and labor-saving in clamping, and provides basis for reliability design, reliability prediction, improvement of the quality of a new product, determination of test conditions and the like; the efficiency of the valve test is improved, and the production cost of the valve is reduced. The whole test process realizes the working condition simulation, automatic opening and closing and simple operation.

Claims

1. The utility model provides a frock is opened and close in area under axial-flow check valve low temperature operating mode, its characterized in that, blind plate (2) shutoff axial-flow check valve (1) both ends make axial-flow check valve (1) form confined space, and blind plate (2) center of one end link up sealed installation ejector pin (7), and the guide bar of this ejector pin (7) one end and check valve (1) is connected, and the other end and distance rod (5) contact are connected, and the contact surface on distance rod (5) is the inclined plane, install on support frame subassembly (3) distance rod (5), its and the output shaft who installs cylinder (4) on support frame subassembly (3).

2. The tool for opening and closing the axial flow check valve under the low-temperature working condition with the pressure as claimed in claim 1, wherein the inclined plane on the thrust rod (5) is a 14-degree inclined plane.

3. The axial flow check valve opening and closing tool under pressure under the low-temperature working condition according to claim 1, wherein the end face of the contact end of the ejector rod (7) and the thrust rod (5) is of a spherical structure.

4. The axial-flow check valve low-temperature working condition under-pressure opening and closing tool according to claim 1, wherein the thrust rod (5) is provided with an anti-rotation device, and the structure of the tool is as follows: an anti-rotation groove is formed in the back of the thrust rod (5), a guide pin is mounted on the support frame assembly (3), and the guide pin is matched with the anti-rotation groove in position.