RU223263U1 - SELF-SEALING DEVICE FOR HYDRAULIC TESTING OF CYLINDERS - Google Patents

Abstract

The utility model relates to testing equipment and is intended for testing closed volumes with at least one cylindrical threaded hole. The proposed self-sealing device for hydraulic testing of cylinders contains a piston fitting with radial channels to ensure the supply of test fluid to the above-piston cavity, located directly on the piston fitting with axial inlet and radial outlet fittings, a sleeve with a sealing element, while the piston fitting is made with threads, corresponding thread of the neck of the cylinder under test, and a supply tube coaxially located inside the piston fitting, the stopper on the sleeve is made in the form of a collapsible ring with a collar that limits the stroke of the piston fitting and prevents the piston fitting from leaving the sleeve, and the sealing element is designed to be located at the end neck of the test cylinder. The technical result of the claimed utility model is to increase the duration of use of the device for hydraulic testing of cylinders, which makes it possible to reduce deformation and premature wear of the cylinder neck threads during the testing process. 1 salary f-ly, 2 ill.

Description

The utility model relates to testing equipment and is intended for testing closed volumes with at least one cylindrical threaded hole (vessels, apparatus, cylinders, etc.).

A known installation for testing pipes contains a frame made of longitudinal beams fastened together, end stops of the frame, load-bearing supports of the frame, movable and fixed plugs with sealing elements, a moving unit for moving the movable plug with a drive mechanism, front and rear thrust parts of the moving unit for moving the movable plugs, a system for creating test pressure, while the frame is mounted motionlessly on load-bearing supports, the end stops of the frame are made in the form of thrust fingers installed in holes made in the longitudinal beams of the frame, the moving unit for the movable plug is made in the form of a carriage having guide cutouts and installed these cutouts on the thrust pin of the frame with the possibility of longitudinal movement relative to the frame, while the rear thrust part of the carriage is located on the outside of the frame, the front thrust part of the carriage is equipped with a thrust pin, the ends of which are installed in guide grooves made in the longitudinal beams of the frame, the drive mechanism of the movement unit The movable plug is made in the form of a hydraulic cylinder located in the carriage coaxially with the plugs and placed on the inside of the frame between the frame thrust pin and the front thrust part of the carriage and having the ability to be placed in the carriage on the outside of the frame between its thrust pin and the rear thrust part of the carriage, and the plugs have shanks with through holes, the shank of the movable plug with its through hole is installed on the thrust finger of the carriage, the shank of the stationary plug with its through hole is installed on the thrust finger of the frame, each plug is made in the form of a mating end part of the tested pipe and forms a connecting device with the end part of the tested pipe , equipped with a locking element that prevents axial movement of the plugs and the pipe under test when they are stretched [RU 2327129, IPC G01M 3/08, published 06/20/2008]. The main disadvantage of the known technical solution is the need for additional connection of the end part with the test product, which increases the complexity of installation/disassembly and the total test time, as well as the lack of a direct relationship between the pressure of the test fluid in the test product and the force pressed on the sealing surface, which can cause deformation of the latter and its premature wear.

A device for testing products for leaks is known, containing a plug with a sealing element and a mechanism for its fixation, made in the form of a rigid stop and guide spring-loaded rollers, the plug is made in the form of two elements, the first of which is connected to spring-loaded rollers with the possibility of limited movement relative to the second element and covers the latter, which is made with two grooves, the device is equipped with two additional sealing elements, each in the form of a V-shaped cuff, one of the shelves of which ends with an elastic edge and is designed to contact the product under test and the inner surface of the first element of the plug, respectively, so that the elastic edge each cuff in a free state is bent towards the contact, and the other shelf of each cuff is placed, respectively, in the groove of the second element of the plug [(patent for invention RU 2017104, IPC G01M 3/02, published 07/30/1994]. The disadvantage of this design is the constant rigid force pressed sealing element, which can lead to premature wear and deformation of the seal, since regardless of the test pressure, the product will be sealed with the maximum possible force.

The technical task of the claimed utility model is to develop a device for hydraulic testing of cylinders, which makes it possible to reduce the negative impact on the sealing element from the force applied during sealing.

The technical result, which consists in increasing the duration of use of such a device, is achieved by creating a self-sealing connection with the neck of the cylinder under pressure, while the pressing force applied to the sealing surface changes in proportion to the change in pressure inside the cylinder automatically.

The technical problem is solved, and the technical result is ensured due to the fact that the self-sealing device for hydraulic testing of cylinders contains a piston fitting with radial channels to ensure the supply of test fluid to the above-piston cavity, located directly on the piston fitting with axial inlet and radial outlet fittings, a sleeve with sealing element, while the piston fitting is made with a thread corresponding to the thread of the neck of the cylinder under test, and a supply tube coaxially located inside the piston fitting, the stopper on the sleeve is made in the form of a collapsible ring with a collar that limits the stroke of the piston fitting and prevents the fitting from coming out the piston is made from a liner, and the sealing element is made in the form of a rubber ring of circular cross-section and is located in the groove of the end of the liner to seal along the end of the neck of the cylinder under test.

The essence of the utility model is to create a hermetic connection with a reduced negative impact on the threaded connection, since the internal (pushing) force on the thread is compensated by the back pressure acting on the sealing surface, and the seal is not made along the thread, but along the flat surface of the end of the cylinder due to the force pressure applied to the sealing surface of the cylinder neck from the test liquid. It is advisable to place the sealing element at the end of the cylinder under test, because This surface, after shaping the cylinder, is subjected to mechanical processing and bears the smallest values of shape deviations, i.e. is the only flat surface, and is located perpendicular to the hole in the neck of the cylinder, which allows for the application of a pressing force perpendicular to the sealing surface. The specified arrangement of the device and equal contact areas of the application of forces make it possible to ensure linear proportionality of the change in pressure inside the product and the prestressing force of the sealing element, which allows reducing wear of the sealing elements, since they are subjected only to the loads necessary to ensure the tightness of the connection during testing, and not the rest of the time perceive loads.

The use of test liquid as an energy carrier for the operation of the fitting-piston makes it possible to simplify the design of the device and eliminate the use of additional devices and energy sources to ensure the pressing force and, accordingly, the tightness of the connection.

In fig. Figure 1 shows a general cross-sectional view of a device for hydraulic testing of self-sealing cylinders; Figure 2 shows a view of the device screwed onto the test cylinder using the following notations:

1 - piston fitting;

2 - inlet fitting;

3 - outlet fitting;

4 - supply tube;

5 - sleeve;

6 - stopper;

7 - sealing element;

8 - thread;

9 - rubber ring;

10 - internal cavity;

11 - supra-piston cavity;

12 - radial channels;

13 - cylinder under test;

14 - neck of the tested cylinder.

A self-sealing device for hydraulic testing of cylinders contains a piston fitting 1 with an axial inlet 2 and radial outlet 3 fittings mounted on it by means of a welded joint, through which the test liquid is supplied and discharged, which is also an energy carrier for the device. At the lower end of the fitting-piston 1 there is a thread 8 for screwing onto the neck of the cylinder and corresponding to the thread of the neck of the cylinder 14. On the fitting-piston 1 coaxially, with the ability to move, a sleeve 5 is placed on it with a stopper 6, which is necessary to limit the stroke of the fitting-piston 1 and preventing it from leaving the sleeve 5. At the end of the sleeve 5 there is a groove in which a sealing element 7 is placed, which is in contact with the neck of the cylinder 14. Inside the piston fitting 1, a supply tube 4 is mounted, connected at one end to the inlet fitting 2, the second end of the tube 4 is placed in the cylinder 13. To ensure the operation of the device between the piston fitting 1 and the sleeve 5, at least two rubber rings 9 of circular cross-section are installed in the grooves, which ensures mobility and tightness during operation.

The device works as follows. The tested cylinder 13 is tilted with the neck up. The assembled device is screwed with thread 8 onto the neck 14 of the test cylinder with the valve previously removed. Inlet and outlet high-pressure hoses (not shown) are installed on inlet 2 and outlet 3 fittings, for example, using quick-release connections. Through the supply hose, a test liquid is supplied to the inlet fitting 2, which enters the test cylinder 13 through the supply tube 4, while through the outlet fitting 3 the gas-air mixture is displaced from the internal cavity of the tested cylinder. As the test cylinder 13 is filled, the test liquid fills the internal cavity 10 of the piston fitting 1, and through the radial channels 12 - the supra-piston cavity 11. After filling the entire device with the test liquid and completely displacing the gas-air mixture from the internal cavity of the test cylinder, the outlet sleeve to fitting 3 is closed. , and step-by-step increase in pressure in the cylinder. As the pressure inside the test cylinder 13 increases, the pressure in the supra-piston cavity 11 also increases, which leads to proportional compression of the sealing element 7 to the end surface of the neck 14 of the test cylinder, ensuring a tight connection between the device and the cylinder.

Relieving pressure, draining the test liquid, and purging the test cylinder with compressed air in order to accelerate the displacement of the test liquid occurs in the reverse order.

Claims (2)

1. A self-sealing device for hydraulic testing of cylinders, containing a piston fitting with radial channels to ensure the supply of test fluid to the above-piston cavity, located directly on the piston fitting with axial inlet and radial outlet fittings, a sleeve with a sealing element, characterized in that the piston fitting made with a thread corresponding to the thread of the neck of the cylinder under test, and a supply tube coaxially located inside the fitting-piston, the stopper on the sleeve is made in the form of a collapsible ring with a collar that limits the stroke of the fitting-piston and prevents the fitting-piston from leaving the sleeve, and the sealing element is made for location at the end of the neck of the cylinder under test. 2. The device according to claim 1, characterized in that the test liquid is used as an energy carrier for the operation of the nozzle-piston.