Disc spring operating mechanism control valve testing device

Abstract

The invention relates to the field of control valve testing, in particular to a disc spring operating mechanism control valve testing device. The disc spring operating mechanism control valve testing device comprises a support, an oil tank and an energy accumulator, the oil tank and the energy accumulator are installed on the support, and the support is provided with an installation block used for installing a control valve to be tested. A high-pressure oil hole, a low-pressure oil hole and an output oil hole which are correspondingly communicated with a high-pressure cavity, a low-pressure cavity and an output cavity of the control valve to be tested respectively are formed in the mounting block, the low-pressure oil hole is communicated with the oil tank, an energy accumulator high-pressure cavity and an energy accumulator low-pressure cavity are formed in the energy accumulator, the high-pressure oil hole is communicated with the energy accumulator high-pressure cavity, and the output oil hole is communicated with the energy accumulator low-pressure cavity. And a low-pressure cavity of the energy accumulator is communicated with the oil tank. The testing device for the control valve of the disc spring operating mechanism can provide higher system pressure, simulate the real working condition of the control valve, can directly install the control valve on the testing device for testing when the control valve is tested, and is low in testing cost.

Description

Technical Field

[0001] The invention relates to the field of control valve testing, and in particular to a disc spring operating mechanism control valve testing device. Background Art

[0002] Hydraulic operating mechanisms are widely used in high-voltage power grids. The action characteristics of the control valve in the hydraulic operating mechanism will directly affect the opening and closing characteristics of the high-voltage circuit breaker. At present, the disc spring hydraulic operating mechanism has gradually replaced the old nitrogen energy storage hydraulic operating mechanism. The system pressure of the hydraulic operating mechanism has also increased, and higher requirements have been placed on the sealing performance and mechanical reliability of the components in the hydraulic operating mechanism. Therefore, it is necessary to test the components in the hydraulic operating mechanism.

[0003] The Chinese invention patent with the authorization announcement number CN110285114B and the authorization announcement date March 9, 2021 discloses a test device for the oil pump assembly of the operating mechanism to test the oil pump assembly in the hydraulic operating mechanism. The test device includes a cylinder body, an oil tank and an accumulator. A high-pressure oil chamber connected to the accumulator and a low-pressure oil chamber connected to the oil tank are arranged in the cylinder body. A piston rod for storing energy in the accumulator is also arranged in the cylinder body. An oil pump assembly oil outlet connected to the high-pressure oil chamber and an oil pump assembly oil inlet connected to the low-pressure oil chamber are arranged on the cylinder body. A solenoid valve is also arranged on the cylinder body, which can make the high-pressure oil chamber and the low-pressure oil chamber connected to realize the automatic loss of pressure of the high-pressure oil chamber, simulating the opening and closing action of the operating mechanism. When in use, the test device can test the oil pump assembly without being set in the circuit breaker, reducing the test cost. The accumulator of the test device adopts a disc spring structure, which can provide a higher system pressure in the test and simulate the real working pressure in the disc spring operating mechanism.

[0004] As the core component of the hydraulic operating mechanism, the control valve has higher requirements on its sealing performance and mechanical reliability. Therefore, the control valve needs to be tested to verify whether it can meet the use requirements. However, the current testing method requires the control valve to be installed on the operating mechanism and tested with the circuit breaker. There is still a problem of high testing cost. Summary of the invention

[0005] The object of the present invention is to provide a disc spring operating mechanism control valve testing device to solve the problem of high testing cost when testing control valves in existing testing methods.

[0006] To achieve the above purpose, the disc spring operating mechanism control valve testing device of the present invention adopts the following technical solutions: A disc spring operating mechanism control valve testing device comprises a bracket, an oil tank and an accumulator, wherein the oil tank and the accumulator are mounted on the bracket, and a mounting block for mounting a control valve to be tested is provided on the bracket, and a high-pressure oil hole, a low-pressure oil hole and an output oil hole are provided in the mounting block, which are respectively connected to the high-pressure chamber, the low-pressure chamber and the output chamber of the control valve to be tested, and the low-pressure oil hole is connected to the oil tank, and an accumulator high-pressure chamber and an accumulator low-pressure chamber are provided in the accumulator, and the high-pressure oil hole is connected to the accumulator high-pressure chamber, and the accumulator low-pressure chamber is connected to the oil tank.

[0007] Furthermore, radially penetrating auxiliary oil holes for installing a monitoring device are provided on the inner walls of the high-pressure oil hole and the output oil hole of the mounting block to monitor the movement state of the valve stem of the control valve.

[0008] Furthermore, a signal cylinder is installed on the mounting block, and a signal cylinder rodless chamber and a signal cylinder rod chamber are provided in the signal cylinder, and the signal cylinder rodless chamber and the signal cylinder rod chamber are connected to the auxiliary oil holes on the output oil hole and the high-pressure oil hole respectively.

[0009] Furthermore, the signal cylinder comprises a signal cylinder piston rod and an auxiliary switch, and the signal cylinder piston rod cooperates with the auxiliary switch to transmit the opening and closing signals of the control valve.

[0010] Furthermore, the accumulator includes an energy storage cylinder and a combined disc spring. A piston is provided in the energy storage cylinder. The piston includes a piston rod. The piston divides the energy storage cylinder into a rodless chamber and a rod chamber. A pressure plate cooperating with the piston rod is provided at one end of the combined disc spring close to the energy storage cylinder, and a fixing plate for stopping the combined disc spring is provided at one end of the combined disc spring away from the energy storage cylinder. The pressure plate, combined disc spring and fixing plate are connected to the energy storage cylinder through studs.

[0011] Furthermore, a connecting piece for connecting the high-pressure chamber of the accumulator with the high-pressure oil hole is provided on the energy storage cylinder.

[0012] Furthermore, a pressure relief valve is installed on the bracket, and the pressure relief valve is communicated with the high-pressure chamber of the accumulator.

[0013] Furthermore, an oil drain valve is installed on the oil tank.

[0014] Furthermore, the oil output hole is a blind hole.

[0015] Furthermore, the high-pressure chamber of the accumulator is connected to an electric motor oil pump for pumping high-pressure oil into the high-pressure chamber of the accumulator.

[0016] Beneficial effects: The disc spring operating mechanism control valve test device of the present invention is a pioneering invention. The disc spring operating mechanism control valve test device of the present invention comprises a bracket, an oil tank and an accumulator. The mounting block provided on the bracket can be used to install the control valve to be tested. The mounting block has oil holes corresponding to the oil chambers of the control valve. The use of the accumulator to provide high-pressure oil for the control valve can ensure a higher system pressure and simulate the real working conditions of the control valve. When testing the control valve, the control valve can be directly installed on the test device for testing, without the need to cooperate with the circuit breaker for whole machine testing, and the testing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a disc spring operating mechanism control valve testing device of the present invention; Figure 2 It is a structural schematic diagram of a mounting block of a disc spring operating mechanism control valve testing device of the present invention; Figure 3 It is a structural schematic diagram of a signal cylinder of a disc spring operating mechanism control valve testing device of the present invention; Figure 4 It is a structural schematic diagram of the accumulator of the disc spring operating mechanism control valve testing device of the present invention.

[0018] In the figure: 1. bracket; 2. oil tank; 3. accumulator; 31. accumulator cylinder body; 32. combined disc spring; 33. accumulator piston rod; 34. accumulator high-pressure chamber; 35. accumulator low-pressure chamber; 36. pressure plate; 37. fixing plate; 38. stud; 39. connecting pipe; 301. first sliding sealing ring; 302. second sliding sealing ring; 4. mounting block; 41. low-pressure oil hole; 42. high-pressure oil hole; 43. output oil hole; 44. first auxiliary oil hole; 45. second auxiliary oil hole; 5. motor oil pump; 6. signal cylinder; 61. signal cylinder cylinder body; 62. signal cylinder piston rod; 63. micro switch; 64. signal cylinder rodless chamber; 65. signal cylinder rod chamber; 7. pressure relief valve; 8. oil drain valve; 9. first oil pipe; 10. second oil pipe. DETAILED DESCRIPTION

[0019] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0020] The disc spring operating mechanism control valve testing device of the present invention can provide high-pressure oil to the control valve to be tested through an accumulator, so as to increase the test pressure to be consistent with the working pressure of the disc spring operating mechanism, thereby simulating the actual working condition of the control valve. At the same time, when testing the control valve, the control valve can be directly installed on the testing device for testing, thereby reducing the testing cost.

[0021] In a basic embodiment, Figure 1As shown, an oil tank 2 and an accumulator 3 are installed below the bracket 1. The oil tank 2 and the accumulator 3 are located at both ends of the bracket 1 respectively. A mounting block 4 is installed above the bracket 1. The mounting block 4 can be used to install the control valve to be tested. Figure 2 As shown, a high-pressure oil hole 42, a low-pressure oil hole 41 and an output oil hole 43 are provided in the mounting block 4, and the high-pressure oil hole 42, the low-pressure oil hole 41 and the output oil hole 43 are respectively connected with the high-pressure chamber, the low-pressure chamber and the output chamber of the control valve to be tested, and the low-pressure oil hole 41 is connected with the oil tank 2 through the first oil pipe 9. An accumulator high-pressure chamber 34 and an accumulator low-pressure chamber 35 are provided in the accumulator 3, and the accumulator low-pressure chamber 35 is connected with the oil tank 2 through the second oil pipe 10. The accumulator high-pressure chamber 34 of the accumulator 3 is connected with the high-pressure oil hole 42 of the mounting block 4. The accumulator 3 can make the test pressure of the control valve to be tested consistent with the working pressure of the disc spring operating mechanism, so as to simulate the real working state of the control valve.

[0022] In other embodiments, since different control valves have different interface sizes, mounting blocks 4 of different sizes can be replaced to test the control valve, and the entire disc spring operating mechanism control valve testing device can be universal.

[0023] In a preferred embodiment, a first auxiliary oil hole 44 and a second auxiliary oil hole 45 are respectively opened on the output oil hole 43 and the high-pressure oil hole 42 of the mounting block 4, and a signal cylinder 6 is installed on the mounting block 4. Figure 3 As shown, the signal cylinder 6 includes a signal cylinder body 61, a signal cylinder piston rod 62 and a micro switch 63. A signal cylinder rodless chamber 64 and a signal cylinder rod chamber 65 are provided in the signal cylinder 6. The signal cylinder rodless chamber 64 is connected with the output oil hole 43 of the mounting block 4 through the first auxiliary oil hole 44, and the signal cylinder rod chamber 65 is connected with the high-pressure oil hole 42 of the mounting block 4 through the second auxiliary oil hole 45. When the control valve to be tested is in the closed state, the signal cylinder rodless chamber 64 is filled with high-pressure oil. At this time, the signal cylinder piston rod 62 is moved to the right by a rightward force, and the signal cylinder piston rod 62 triggers the micro switch 63 to close the micro switch 63, and transmits a control valve closing signal to the control system of the test device. When the control valve to be tested is in the open state, the signal cylinder rodless chamber 64 is filled with low-pressure oil, and the signal cylinder piston rod 62 is moved to the left by a leftward force. At this time, the micro switch 63 is disconnected, and a control valve opening signal is transmitted to the control system, thereby testing the switching performance and mechanical reliability of the control valve.

[0024] In other embodiments, oil pressure sensors may be installed in the first auxiliary oil hole 44 and the second auxiliary oil hole 45 to monitor changes in system pressure and oil pressure fluctuations in the output chamber of the control valve during the test, and indirectly test the state switching process of the control valve to make the test result more accurate.

[0025] The signal cylinder 6 and the oil pressure sensor can also be used to test the mechanical life of the control valve, and to test the discreteness of the control valve's actions under various states such as continuous action and intermittent action.

[0026] In a preferred embodiment, Figure 4 As shown, the accumulator 3 refers to the structure of the disc spring mechanism and uses a combined disc spring 32 to store energy, so that the real working pressure of the control valve in the disc spring operating mechanism can be achieved. A combined disc spring 32 is arranged below the accumulator cylinder 31, and an accumulator piston rod 33 is arranged inside the accumulator cylinder 31. The accumulator piston rod 33 and the accumulator cylinder 31 are sealed by a first sliding seal ring 301 and a second sliding seal ring 302. A pressure plate 36 is arranged above the combined disc spring 32, and a fixed plate 37 is arranged below the combined disc spring 32. The combined disc spring 32, the pressure plate 36 and the fixed plate 37 are installed on the accumulator cylinder 31 through studs 38. The accumulator piston rod 33 moves downward under the action of the high-pressure oil in the accumulator high-pressure chamber 34, and the accumulator piston rod 33 pushes the pressure plate 36 to move downward. The pressure plate 36 compresses the combined disc spring 32 to achieve high-pressure energy storage, providing the control valve with a real working pressure in the disc spring operating mechanism.

[0027] In a preferred embodiment, a connecting pipe 39 is provided on the accumulator cylinder 31, and the high-pressure oil hole 42 of the mounting block 4 is connected to the accumulator high-pressure chamber 34 through the connecting pipe 39. The connecting pipe 39 can reduce the leakage of oil at the connection position between the high-pressure oil hole 42 and the accumulator high-pressure chamber 34.

[0028] In other embodiments, the high-pressure oil hole 42 may be directly connected to the high-pressure chamber 34 of the accumulator, and a sealing ring may be provided at the connection position between the high-pressure oil hole 42 and the high-pressure chamber 34 of the accumulator to also reduce oil leakage.

[0029] In a preferred embodiment, a pressure relief valve 7 is installed on the bracket 1, and the pressure relief valve 7 is connected to the accumulator high-pressure chamber 34. When the test is completed or the test oil pressure needs to be lowered, the pressure can be released through the pressure relief valve 7 to ensure safety during the test.

[0030] In other embodiments, the accumulator high-pressure chamber 34 is connected to the oil tank 2 through an oil pipe, and a solenoid valve for controlling on / off is provided on the oil pipe. When the test is completed or the oil pressure needs to be lowered, the solenoid valve can be opened to connect the accumulator high-pressure chamber 34 with the oil tank 2, thereby reducing the oil pressure in the accumulator high-pressure chamber 34.

[0031] In a preferred embodiment, an oil drain valve 8 is provided on the oil tank 2 , and the oil in the oil tank 2 can be drained through the oil drain valve 8 when the testing device is not in use.

[0032] In other embodiments, when the testing device is not in use, the oil tank 2 can be disassembled and the oil in the oil tank 2 can be drained.

[0033] In a preferred embodiment, the output oil hole 43 of the mounting block 4 is a blind hole, which reduces the working displacement of the control valve while ensuring that the control valve can move normally. In other embodiments, the output oil hole 43 can be a through hole, and the output oil hole 43 is connected to the rodless chamber of the hydraulic cylinder, which does not affect the test of the control valve.

[0034] In a preferred embodiment, the accumulator high pressure chamber 34 is connected to a motor oil pump 5 to provide high pressure oil to the accumulator high pressure chamber 34. In other embodiments, the accumulator high pressure chamber 34 may be connected to a hydraulic cylinder or other device that can provide high pressure oil.

[0035] The specific implementation of the disc spring operating mechanism control valve testing device of the present invention is as follows: When testing the control valve, the control valve is mounted on the mounting block 4 accordingly, and the motor oil pump 5 pumps high-pressure oil into the high-pressure chamber 34 of the accumulator. The accumulator piston rod 33 moves downward under the action of the high-pressure oil, driving the pressure plate 36 to compress the combined disc spring 32 to store energy. The high-pressure oil in the high-pressure chamber 34 of the accumulator enters the high-pressure chamber of the control valve through the high-pressure oil hole 42 of the mounting block 4 under the action of the motor oil pump 5 and the combined disc spring 32, providing the control valve with a pressure consistent with the working pressure of the disc spring operating mechanism, simulating the real working pressure of the control valve, and the low-pressure chamber of the control valve is connected to the oil tank through the low-pressure oil hole 41 of the mounting block 4; when the control valve is in the closed state, the output chamber and The output oil hole 43 of the mounting block 4 is in a high-pressure state, and the signal cylinder rodless chamber 64 in the signal cylinder 6 is also in a high-pressure state. At this time, the signal cylinder piston rod 62 will be moved to the right by a rightward force, and the signal cylinder piston rod 62 will trigger the microswitch 63 to close the microswitch 63, and transmit the control valve closing signal to the control system of the test device; when the control valve is in the open state, the signal cylinder rodless chamber 64 is converted to low-pressure oil, and the signal cylinder piston rod 62 is moved to the left by a leftward force. At this time, the microswitch 63 is disconnected, and the control valve opening signal is transmitted to the control system, thereby realizing the test of the control valve. The sealing performance and mechanical reliability of the control valve can be obtained through repeated tests.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A disc spring operating mechanism control valve testing device, characterized in that: It includes a bracket, an oil tank and an accumulator, the oil tank and the accumulator are installed on the bracket, a mounting block for mounting the control valve to be tested is provided on the bracket, a high-pressure oil hole, a low-pressure oil hole and an output oil hole are provided in the mounting block, which are respectively connected to the high-pressure chamber, the low-pressure chamber and the output chamber of the control valve to be tested, the low-pressure oil hole is connected to the oil tank, the accumulator is provided with an accumulator high-pressure chamber and an accumulator low-pressure chamber, the high-pressure oil hole is connected to the accumulator high-pressure chamber, and the accumulator low-pressure chamber is connected to the oil tank.

2. The disc spring operating mechanism control valve testing device according to claim 1, characterized in that: A radially penetrating auxiliary oil hole for installing a monitoring device is provided on the inner wall of the high-pressure oil hole and the output oil hole of the mounting block to monitor the movement state of the valve stem of the control valve.

3. The disc spring operating mechanism control valve testing device according to claim 2, characterized in that: A signal cylinder is installed on the mounting block. A signal cylinder rodless chamber and a signal cylinder rod chamber are arranged in the signal cylinder. The signal cylinder rodless chamber and the signal cylinder rod chamber are connected to the auxiliary oil holes on the output oil hole and the high-pressure oil hole respectively.

4. The disc spring operating mechanism control valve testing device according to claim 3 is characterized in that: The signal cylinder comprises a signal cylinder piston rod and an auxiliary switch, and the signal cylinder piston rod cooperates with the auxiliary switch to transmit the opening and closing signals of the control valve.

5. The disc spring operating mechanism control valve testing device according to claim 1, characterized in that: The accumulator includes an energy storage cylinder and a combined disc spring. A piston is arranged in the energy storage cylinder. The piston includes a piston rod. The piston divides the energy storage cylinder into a rodless chamber and a rod chamber. A pressure plate cooperating with the piston rod is arranged at one end of the combined disc spring close to the energy storage cylinder, and a fixing plate for stopping the combined disc spring is arranged at one end of the combined disc spring away from the energy storage cylinder. The pressure plate, the combined disc spring and the fixing plate are connected to the energy storage cylinder by studs.

6. The disc spring operating mechanism control valve testing device according to claim 5, characterized in that: A connecting piece for connecting the high-pressure chamber of the accumulator with the high-pressure oil hole is arranged on the energy storage cylinder.

7. The disc spring operating mechanism control valve testing device according to any one of claims 1 to 6, characterized in that: A pressure relief valve is installed on the bracket, and the pressure relief valve is communicated with the high-pressure chamber of the accumulator.

8. The disc spring operating mechanism control valve testing device according to any one of claims 1 to 6, characterized in that: An oil drain valve is installed on the oil tank.

9. The disc spring operating mechanism control valve testing device according to any one of claims 1 to 6, characterized in that: The oil output hole is a blind hole.

10. The disc spring operating mechanism control valve testing device according to any one of claims 1 to 6, characterized in that: The accumulator high-pressure chamber is connected to a motor oil pump for pumping high-pressure oil into the accumulator high-pressure chamber.

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