CN112146814A - Gas relay sealing performance test device - Google Patents

Abstract

The invention relates to a gas relay sealing performance test device which comprises a rack, wherein an oil storage tank and a clamping mechanism are arranged on the rack, the clamping mechanism comprises a clamping fixed end and a clamping movable end, the clamping movable end can move to match with the clamping fixed end to clamp and communicate two sides of a gas relay, the clamping fixed end is connected with an oil outlet of the oil storage tank through a first connecting pipe, and an oil pump, a first electromagnetic valve and a pressure gauge are arranged on the first connecting pipe; the clamping moving end is connected with a vacuum pump through a second connecting pipe, and a second electromagnetic valve, a vacuum sensor and a third electromagnetic valve are sequentially arranged on the second connecting pipe in the direction from the clamping moving end to the vacuum pump; and a positioning mechanism is arranged on the rack and used for positioning the mounting position of the gas relay. This gas relay sealing performance test device is applicable to the sealing performance check-up of floater formula gas relay, and through the positioning mechanism who sets up, not only the installation of being convenient for moreover can also improve the degree of accuracy of test result.

Description

A gas relay sealing performance test device

technical field

The invention relates to the technical field of gas relay testing, in particular to a gas relay sealing performance testing device.

Background technique

Oil-immersed transformers are currently the most widely used transformers in domestic power systems, and are also one of the most important equipment in the power supply system. The power supply system provides multiple protections to ensure the safe operation of the transformer. Among them, the gas relay is an oil-immersed transformer. The main protection component of the internal fault of the transformer. When a fault occurs inside the transformer, the oil will decompose to generate gas or cause the oil flow to surge, and then the contact of the gas relay will act to connect the designated control circuit, and send a signal in time or automatically cut off the transformer. Gas relays are also called gas relays.

The test methods and test equipment for the heavy gas flow rate value and light gas volume value of the gas relay are relatively mature. The sealing performance test usually uses a gas pump and a liquid pump to pressurize the gas relay to test the sealing performance. The above method is to realize the sealing performance of the baffle-type gas relay. The method of performance test cannot meet the test requirements of double floating ball gas relay. Because the floating ball in the gas relay has defects such as tiny cracks or hidden cracks, the test time is limited and it is difficult to detect through the above-mentioned booster test method.

When the gas relay is calibrated and installed, due to the different manufacturers, specifications and models of the gas relay under test, it brings a lot of trouble to the card installation of the gas relay under test. In actual operation, items such as the flow rate value of heavy gas and the volume value of light gas are generally tested at the same time, not only the sealing performance test, so the test results will also be affected by the oil flow center and pipeline of the gas relay to be tested when the gas relay is installed. Whether the center is centered or not. The gas relay to be tested needs to be tested for sealing performance, and the pipeline must bear a certain pressure, and the sealing performance of the card connection is also very important. The existing card loading mechanism is difficult to meet the requirements of sealing, neutrality, and convenience of clamping at the same time.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a gas relay sealing performance test device, so as to solve the problem that the existing test device is inconvenient for clamping and difficult to center due to the clamping mechanism, and it is difficult to ensure the sealing performance.

To achieve the above object, the present invention adopts the following technical solutions:

A gas relay sealing performance test device, comprising a frame, an oil storage tank and a clamping mechanism are arranged on the frame, the clamping mechanism includes a clamping fixed end and a clamping movable end, and the clamping movable end can move to cooperate with the clamping fixed end. The two ends of the gas relay are clamped and communicated on both sides of the gas relay, and the fixed end of the clamping and the movable end of the clamping are provided with sealing gaskets; The pipe is provided with an oil pump, a first solenoid valve and a pressure gauge;

The clamping movable end is connected with a vacuum pump through a second connecting pipe, and the second connecting pipe is sequentially provided with a second solenoid valve, a vacuum sensor and a third solenoid valve in the direction of the clamping movable end facing the vacuum pump;

There is a positioning mechanism on the frame. The positioning mechanism is used to locate the installation position of the gas relay. The positioning mechanism includes a lifting screw and a positioning fork screwed on the lifting screw. The positioning fork only moves up and down in the up and down direction. The fork includes two positioning inclined arms that are symmetrical in the front and rear. The inclination direction of the two positioning inclined arms makes the opening of the positioning fork gradually increase from bottom to top. The clamping axes between the movable ends are in the same vertical plane.

Further, the positioning fork also includes a lifting cylinder located at the lower part of the positioning fork, the lifting cylinder is inserted into the fixing sleeve, the fixing sleeve is arranged on the frame, the inner wall of the fixing sleeve is provided with a chute extending up and down, and the lifting cylinder is The outer wall of the device is provided with a sliding block or a sliding column, and the sliding block or sliding column extends along the radial direction of the lifting cylinder and is slidingly matched with the sliding groove.

Further, the upper end of the lifting screw is provided with a screwing part.

Further, two positioning forks are provided, and the two positioning forks respectively position and support the left and right parts of the gas relay.

Further, the frame is provided with an oil receiving structure on the periphery of the positioning mechanism, and the oil receiving structure includes a diversion swash plate and a bottom plate connected to the bottom of the diversion swash plate, so that the oil receiving structure is a groove with an open upper end, and the bottom plate is formed. A drain pipe is connected, and the drain pipe is used to return the received oil to the storage tank.

Further, a filter screen is also arranged in the oil receiving structure, and the fixing sleeve passes through the middle of the filter screen.

Further, the first connecting pipe is connected with a third connecting pipe between the first solenoid valve and the pressure gauge, the third connecting pipe is provided with a fourth solenoid valve, and the third connecting pipe is far from the first connecting pipe. One end is connected to the oil return port of the oil storage tank.

Further, the sealing gasket is provided with several sealing grooves, and the sealing grooves are arranged concentrically.

Further, the clamping movable end includes a clamping plate, the sealing groove is arranged on the clamping plate, the clamping plate is vertically connected with a movable tube, the movable tube is connected with the second connecting tube through a telescopic tube, and the movable tube is slidably assembled on the horizontal. On the sleeve, the outer wall of one section of the movable tube is provided with an external thread, which is threadedly assembled with the adjusting nut to form a lead screw nut mechanism.

Further, an operating handle is provided on the outer wall of the adjusting nut.

Beneficial effects of the present invention:

The gas relay sealing performance test device of the present invention adopts a method of vacuuming first and then injecting a liquid test medium. If the float ball in the gas relay to be tested has defects such as tiny cracks or hidden cracks, in the process of vacuuming, not only the inside of the gas relay can be evacuated, but also the inside of the float ball can be evacuated. When the liquid test medium is relatively easy to enter into the float, it can be judged whether the float is faulty by observing whether the float of the float is affected. For the fault judgment of the gas relay part except the float ball, observe whether there is seepage point after pressurization. The gas relay sealing performance test device of the present invention is provided with a positioning mechanism, which can support the gas relay and adjust the height to the optimum, which is convenient for the installation of the gas relay. The two symmetrical positioning inclined arms of the positioning mechanism can ensure the accurate position of the gas relay in the front and rear directions, and do not need to be adjusted separately; and when the height is adjusted, the relative position in the front and rear directions will not change accordingly, with better alignment Effect. Tests of other items, such as heavy gas flow rate value and light gas volume value test, can also be carried out. With the positioning mechanism in the present invention, the alignment of the gas relay installation can be well ensured and the accuracy of the results can be improved.

Description of drawings

Fig. 1 is the principle schematic diagram of the gas relay sealing performance test device of the present invention;

Fig. 2 is the partial structure schematic diagram (front view) of the gas relay sealing performance test device of the present invention;

Fig. 3 is the side view structure schematic diagram of the positioning fork in Fig. 2;

FIG. 4 is a schematic diagram of the lifting structure of the positioning fork in FIG. 2 .

The names corresponding to the marks in the figure:

1. Oil storage tank, 2. First connecting pipe, 3. Oil pump, 4. First solenoid valve, 5. Pressure gauge, 6. Third connecting pipe, 7. Fourth solenoid valve, 8. Gas relay, 9. Section Second solenoid valve, 10, Second connecting pipe, 11, Vacuum sensor, 12, Third solenoid valve, 13, Vacuum pump, 14, Fixed end of clamping, 15, Bearing, 16, Fixed sleeve, 161, Chute, 17 , clamping moving end, 171, movable tube, 172, horizontal sleeve, 173, adjusting nut, 18, positioning mechanism, 181, positioning fork, 1811, positioning inclined arm, 182, lifting cylinder, 1821, sliding column, 183, Lifting screw, 19, frame, 20, deflector swash plate, 21, oil discharge pipe, 22, filter screen.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Example:

As shown in Figures 1-4, a gas relay sealing performance test device includes a frame 19, an oil storage tank 1 and a clamping mechanism are arranged on the frame, and the oil storage tank 1 is equipped with a test medium, which is transformer oil or kerosene. The clamping mechanism includes a clamping fixed end 14 and a clamping movable end 17 . The clamping movable end is movable to cooperate with the clamping fixed end to clamp and communicate with both sides of the gas relay 8 .

The clamping fixed end 14 is connected to the oil outlet of the oil storage tank 1 through the first connecting pipe 2 , and the first connecting pipe 2 is provided with an oil pump 3 , a first solenoid valve 4 and a pressure gauge 5 .

The clamping movable end is connected with a vacuum pump 13 through a second connecting pipe 10 . The second connecting pipe 10 is provided with a second solenoid valve 9 , a vacuum sensor 11 , and a third solenoid valve 12 in the direction of the clamping movable end toward the vacuum pump 13 .

The first connecting pipe 2 is connected with a third connecting pipe 6 between the first solenoid valve 4 and the pressure gauge 5. The third connecting pipe 6 is provided with a fourth solenoid valve 7, and the third connecting pipe is far from the first connecting pipe. One end is connected to the oil return port of the oil storage tank.

The frame is provided with a positioning mechanism 18, which is used to locate the installation position of the gas relay 8. The positioning mechanism 18 includes a lifting screw 183 and a positioning fork 181 screwed on the lifting screw 183. The positioning fork 181 is only used for Up and down movement. The positioning fork includes two positioning inclined arms 1811 that are symmetrical in the front and rear. and the clamping axis between the clamping movable end is in the same vertical plane. Since the symmetrical center line between the two positioning inclined arms and the clamping axis are in the same vertical plane, the alignment in the front and rear directions can be ensured. Through the lifting and lowering of the lifting screw, the support height can be adjusted, the position can be adjusted, and then the two ends can be fixed. During the height adjustment process of the lifting screw, the front and rear positions of the gas relay do not move.

The positioning fork includes a lifting cylinder 182 located at the lower part of the positioning fork. The lifting cylinder 182 is inserted into the fixing sleeve 16, the fixing sleeve 16 is arranged on the frame, and the inner wall of the fixing sleeve is provided with a chute 161 extending up and down. The lifting cylinder 182 There is a slider or a sliding column 1821 on the outer wall of the outer wall, and the sliding block or sliding column extends along the radial direction of the lifting cylinder and is slidingly matched with the sliding groove 161 up and down. The inner hole wall of the lifting cylinder 182 is provided with threads, which are matched with the lifting screw 183 . The upper end of the lifting screw 183 is provided with a screwing part, which rotates the lifting screw to drive the lifting cylinder to rise and fall. The lower part of the lift screw is rotatably assembled on the frame through the bearing 15 .

There are two positioning forks, and the two positioning forks respectively position and support the left and right parts of the gas relay. The two positioning forks are set symmetrically on the left and right, and the two-point positioning ensures the levelness of the gas relay.

The frame is provided with an oil receiving structure on the periphery of the positioning mechanism. The oil receiving structure includes a swash plate 20 and a bottom plate connected to the bottom of the swash plate 20, so that the oil receiving structure is a groove with an open upper end. The bottom plate is connected with an oil discharge pipe 21 for returning the received oil to the oil storage tank. By setting the oil receiving structure, the oil spilled when the gas relay is disassembled after the test can be collected in a centralized manner to prevent contamination of the countertop and also achieve the purpose of saving.

There is also a filter screen 22 in the oil receiving structure, and the fixing sleeve 16 passes through the middle of the filter screen to prevent other components from falling into the bottom or impurities from blocking the oil discharge pipe.

The fixed end of the clamping and the movable end of the clamping are provided with sealing gaskets; the sealing gaskets are provided with several sealing grooves, and the sealing grooves are arranged concentrically. Both the clamping movable end and the clamping fixed end include clamping plates, and the sealing grooves are arranged on the end faces of the clamping plates. The main body of the clamping plate is a vertical plate structure or a flange structure, and is matched with the end faces of the inlet and outlet of the gas relay.

A movable tube 171 is vertically connected to the clamping plate of the clamping movable end. The movable tube 171 is connected to the second connecting tube through a telescopic tube. The movable tube 171 is slidably assembled on the horizontal sleeve 172. The external thread is assembled with the adjusting nut 173 to form a lead screw nut mechanism. An operating handle is provided on the outer wall of the adjusting nut, and rotating the adjusting nut can make the movable tube move linearly, that is, move in the left and right directions.

A gas relay sealing performance test device of the present invention, when in use:

(1) Clamping and fixing:

The gas relay is clamped in the clamping mechanism, and the gas relay 8 is supported by adjusting the height of the positioning fork in the positioning mechanism. Then rotate the adjusting nut 173 to make the movable tube 171 move towards the direction of the gas relay until the clamping is firm. Before clamping, you can choose a suitable sealing ring according to the specifications of the gas relay, and install it in a better sealing groove to ensure the tightness of the contact.

(2), close the first solenoid valve 4, the fourth solenoid valve 7, open the second solenoid valve 9, the third solenoid valve 12, start the vacuum pump 13, and connect the gas relay and the second solenoid valve between the gas relay and the vacuum pump. The connecting pipe is evacuated. During this process, the vacuum sensor 11 collects the vacuum degree signal in real time and transmits it to the control system. When the set test vacuum degree and holding time are reached, the vacuuming is stopped and the third solenoid valve 12 is closed.

(3) Open the fourth solenoid valve 7, and the oil in the oil storage tank 1 can enter the gas relay through the third connecting pipe and the second connecting pipe. The second solenoid valve 9 is closed.

(4) Open the first solenoid valve 4, start the oil pump 3, pressurize, output the set test pressure, and the pressure is detected by the pressure gauge.

The control system starts timing, and ends when the test set time is reached. Observe whether the gas relay meets the industry standard judgment requirements after the test.

(5), close the oil pump 3, close the first solenoid valve 4, open the fourth solenoid valve 7, the oil pressure becomes low, the oil storage tank is located at the bottom of the frame, the gas relay is at the top, and the oil can also return under the action of gravity. Remove the gas relay and the test is over. During the dismantling process, if oil seeps out or flows out through the nozzle, it can fall into the oil receiving structure.

In this embodiment, the signals collected by the pressure gauge and the vacuum sensor are all transmitted to the controller in the control system. The controller processes the signals and makes instructions to control the actions of the corresponding electrical components, such as controlling the opening and closing actions of each solenoid valve, and the operation of the vacuum pump. Start and stop.

The characteristics of the gas relay sealing performance test device of the present invention are described as follows.

If the floating ball in the gas relay to be tested has defects such as tiny cracks or hidden cracks, in the process of vacuuming, not only the inside of the gas relay can be evacuated, but also the inside of the floating ball can be evacuated. When the liquid test medium enters the float relatively easily, it can be judged whether the float is faulty by observing whether the float of the float is affected. For the fault judgment of the gas relay part other than the float ball, it is similar to the method of observing after pressurization in the prior art, whether there is a seepage point, etc. In addition, the gas relay sealing performance test device of the present invention can also conduct other tests, such as heavy gas flow rate value, light gas volume value and other tests, with the positioning mechanism in the present invention, it can well ensure the centering of the gas relay installation to improve the accuracy of the results.

The present invention is not limited to the above-mentioned best embodiment, and anyone can obtain other various forms of products under the inspiration of the present invention, but no matter if any changes are made in its shape or structure, all products with the same or similar characteristics as those of the present application can be obtained. Similar technical solutions all fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a gas relay sealing performance test device which characterized in that: the clamping mechanism comprises a clamping fixed end and a clamping movable end, the clamping movable end can move to match with the clamping fixed end to clamp and communicate two sides of the gas relay, and the clamping fixed end and the clamping movable end are both provided with sealing gaskets; the clamping fixed end is connected with an oil outlet of the oil storage tank through a first connecting pipe, and an oil pump, a first electromagnetic valve and a pressure gauge are arranged on the first connecting pipe;

the clamping moving end is connected with a vacuum pump through a second connecting pipe, and a second electromagnetic valve, a vacuum sensor and a third electromagnetic valve are sequentially arranged on the second connecting pipe in the direction from the clamping moving end to the vacuum pump;

the frame is provided with a positioning mechanism, the positioning mechanism is used for positioning the mounting position of the gas relay, the positioning mechanism comprises a lifting screw rod and a positioning fork spirally mounted on the lifting screw rod, the positioning fork only does lifting movement in the vertical direction, the positioning fork comprises two positioning inclined arms which are symmetrical front and back, the inclined directions of the two positioning inclined arms enable the opening of the positioning fork to be gradually enlarged from bottom to top, and a symmetrical central line between the two positioning inclined arms and a clamping axis between the clamping fixed end and the clamping movable end are located in the same vertical plane.

2. The gas relay sealing performance test apparatus according to claim 1, characterized in that: the positioning fork further comprises a lifting cylinder located at the lower portion of the positioning fork, the lifting cylinder is inserted into a fixing sleeve, the fixing sleeve is arranged on the rack, a sliding groove extending up and down is formed in the inner wall of the fixing sleeve, a sliding block or a sliding column is arranged on the outer wall of the lifting cylinder, and the sliding block or the sliding column extends along the radial direction of the lifting cylinder and is in sliding fit with the sliding groove up and down.

3. The gas relay sealing performance test apparatus according to claim 2, characterized in that: the upper end of the lifting screw rod is provided with a screwing part.

4. The gas relay sealing performance test apparatus according to claim 3, characterized in that: the positioning forks are two, and the two positioning forks are used for positioning and supporting the left part and the right part of the gas relay respectively.

5. The gas relay sealing performance testing apparatus according to claim 4, characterized in that: the frame in positioning mechanism's periphery is equipped with connects oily structure, connects oily structure to include the water conservancy diversion swash plate and connect the bottom plate of water conservancy diversion swash plate bottom for connect oily structure to be upper end open-ended groove, the bottom plate is connected with the oil extraction pipe, the oil extraction pipe is used for returning the oil of receipt to the batch oil tank.

6. The gas relay sealing performance testing apparatus according to claim 5, characterized in that: and a filter screen is also arranged in the oil receiving structure, and the fixing sleeve penetrates through the middle part of the filter screen.

7. The gas relay sealing performance test apparatus according to claim 1, characterized in that: and a third connecting pipe is connected between the first electromagnetic valve and the pressure gauge on the first connecting pipe, a fourth electromagnetic valve is arranged on the third connecting pipe, and one end, far away from the first connecting pipe, of the third connecting pipe is connected to an oil return port of the oil storage tank.

8. The gas relay sealing performance test apparatus according to claim 1, characterized in that: the sealing gasket is provided with a plurality of sealing grooves which are arranged in the same circle center.

9. The gas relay sealing performance testing apparatus according to claim 8, characterized in that: the clamping moving end comprises a clamping plate, a sealing groove is formed in the clamping plate, a moving pipe is vertically connected to the clamping plate, the moving pipe is connected with a second connecting pipe through a telescopic pipe, the moving pipe is assembled on the horizontal sleeve in a sliding mode, an external thread is arranged on the outer wall of one section of the moving pipe and assembled with an adjusting nut in a threaded mode, and a screw nut mechanism is formed.

10. The gas relay sealing performance testing apparatus according to claim 9, characterized in that: and an operating handle is arranged on the outer wall of the adjusting nut.

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