A portable pressure calibration device

Abstract

The utility model provides a kind of portable pressure calibration device, including manual pressure pump, trim valve, pressure gauge, hose, test line and multimeter, the top end of manual pressure pump is provided with pressure gauge, one side of manual pressure pump is installed trim valve, the lateral wall of manual pressure pump is connected with hose by air outlet, the hose is connected with density relay, the density relay is connected with multimeter by test line, it is convenient to carry, and measurement is accurate.

Description

Technical Field

[0001] This utility model relates to the field of pressure calibration technology, specifically to a portable pressure calibration device. Background Technology

[0002] Sulfur hexafluoride (SF6) gas density relays are used to detect changes in the pressure or density of SF6 within SF6 electrical equipment. Their performance directly affects the safe and reliable operation of this equipment. SF6 gas density relays installed in the field, due to infrequent operation, may become sluggish or experience poor contact after a period of time. If a gas leak occurs and the pressure drops to the trigger value, there will be no alarm signal output, i.e., "failure to operate." Sometimes, temperature compensation performance may deteriorate, leading to malfunctions in the SF6 gas density relay contacts when the ambient temperature changes, i.e., "false operation." Therefore, relevant standards of the State Grid Corporation of China clearly stipulate that all users of SF6 electrical switches should periodically calibrate SF6 gas density relays. From practical operation experience, regular calibration of SF6 gas density relays in the field is a necessary means to prevent problems before they occur and ensure the safe and reliable operation of power equipment.

[0003] The inventors discovered the following technical problem:

[0004] Currently, most gas pressure testing equipment on the market adopts an integrated design, with all components integrated into a single enclosure. This requires carrying a heavy enclosure and gas cylinder, and external power is needed for testing. Pressure adjustment and control are inflexible during the testing process. For situations without power supply or for testing tasks requiring precise pressure control, integrated equipment is no longer suitable. Furthermore, the latest product standards have added the requirement to simultaneously measure contact resistance during testing. Existing gas pressure testing equipment is not portable and cannot measure resistance. Utility Model Content

[0005] The purpose of this invention is to provide a portable pressure calibration device that can solve the technical problem of poor portability of existing gas pressure calibration equipment.

[0006] To achieve the above objectives, this utility model proposes a portable pressure calibration device, comprising a manual pressure pump, a fine-tuning valve, a pressure gauge, a hose, test leads, and a multimeter. The pressure gauge is installed at the top of the manual pressure pump, the fine-tuning valve is installed on one side of the manual pressure pump, the hose is connected to the side wall of the manual pressure pump through an air outlet, the hose is connected to a density relay, and the density relay is connected to the multimeter through test leads.

[0007] Further configured, the manual pressure pump includes an air cylinder, a handle, a connecting rod, a hinge plate, a push rod, and a spring. Two handles are hinged to the bottom end of the air cylinder. The handles are movably connected to the connecting rod. The connecting hinge plate has a push rod installed at the top end and a push plate installed at the end of the push rod. The push plate is movably disposed inside the air cylinder.

[0008] A further configuration includes a baffle located near the hinge plate and on the push rod, with a spring positioned between the baffle and the push rod, the spring located on the outside of the push rod.

[0009] A further configuration is provided, wherein an adapter is installed at the top of the air cylinder.

[0010] A further configuration is that the adapter can be detachably connected to a pressure gauge.

[0011] A further configuration is provided, wherein an air outlet is installed on the side wall of the air cylinder, and the air outlet is connected to a flexible hose.

[0012] A further configuration is provided, wherein the density relay is provided with a gas path interface, and the gas path interface is connected to a flexible hose.

[0013] A further configuration includes a circuit interface for the density relay, the circuit interface being connected to test leads.

[0014] A further configuration is that the pressure gauge is equipped with a display.

[0015] A further configuration is provided, wherein a pressure relief valve is installed at the end of the fine-tuning valve.

[0016] The beneficial effects of one or more of the above technical solutions:

[0017] The manual pressure pump, pressure gauge, hose, test leads, and density relay are designed as separate units, making assembly and disassembly convenient. The pressure is provided by the manual pressure pump, and the pressure generated can be flexibly controlled. There is no need to carry a gas cylinder, reducing the size of the housing and making the overall device lightweight and easy to carry. It is also equipped with a fine-tuning valve for precise pressure adjustment and setting, and the matching multimeter can measure the contact resistance of the contacts. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] In the diagram, 1 is a manual pressure pump; 11 is a handle; 12 is a connecting rod; 13 is a hinge plate; 14 is a push rod; 15 is a spring; 16 is a baffle; 17 is an air pump; 18 is a fine-tuning valve; 181 is a pressure relief valve; 19 is a conversion connector; 110 is a pressure gauge; and 111 is an air outlet.

[0021] 2. Hose; 3. Test leads; 4. Density relay; 41. Air interface; 42. Circuit interface; 5. Multimeter. Detailed Implementation

[0022] The specific implementation of this embodiment will now be described with reference to the accompanying drawings.

[0023] A portable pressure calibration device, referring to Figure 1 The device includes a manual pressure pump 1, a fine-tuning valve 18, a pressure gauge 110, a hose 2, test leads 3, and a multimeter 5. All major components are housed in a portable protective case, designed for shock resistance and easy carrying. The manual pressure pump 1 has a pressure gauge 110 at its top, with an accuracy of 0.2%. This gauge is used to measure pressure during the calibration process, and its displayed value also serves as the standard pressure value for the calibration device, providing a reference pressure for calculating the parameters of the tested equipment. A fine-tuning valve 18 is installed on one side of the manual pressure pump 1. The side wall of the manual pressure pump 1 is connected to the hose 2 via an outlet 111. The hose 2 is connected to a density relay 4, which is connected to the multimeter 5 via test leads 3. The multimeter 5 is an existing model. When set to the buzzer mode, the multimeter 5 is used to monitor changes in the contact status of the tested equipment during calibration. When set to the resistance mode, the multimeter 5 is used to measure the contact resistance of the tested equipment's contacts.

[0024] The manual pressure pump 1 can be an existing PV211-P type pneumatic manual pump. The manual pressure pump 1 includes an air cylinder 17, a handle 11, a connecting rod 12, a hinge plate 13, a push rod 14, and a spring 15. Two handles 11 are hinged to the bottom of the air cylinder 17. The handles 11 are movably connected to the connecting rod 12, which connects to the hinge plate 13. The push rod 14 is installed at the top of the hinge plate 13, and the push plate is installed at the end of the push rod 14. The push plate is movably installed inside the air cylinder 17.

[0025] A baffle 16 is provided near the hinge plate 13 and on the push rod 14. A spring 15 is provided between the baffle 16 and the push rod 14, and the spring 15 is located on the outside of the push rod 14.

[0026] An adapter 19 is installed at the top of the air cylinder 17. The adapter 19 can be detachably connected to the pressure gauge 110. The adapter 19 is used to convert the interfaces of different tested devices into standard interfaces, thereby realizing the connection in the air circuit and completing the testing process.

[0027] An air outlet 111 is installed on the side wall of the air cylinder 17. The air outlet 111 is connected to the hose 2. The density relay 4 is equipped with an air circuit interface 41, which is connected to the hose 2. The density relay 4 is equipped with a circuit interface 42, which is connected to the test line 3. The hose 2 is used for the connection of the air circuit, and the test line 3 is used for the connection of the circuit during contact testing. All the air circuit connections mentioned above are sealed with existing sealing rings and sealing methods. Sealing the air circuit with sealing rings is easy to achieve with existing technology, ensuring that the calibration air circuit does not leak.

[0028] The pressure gauge 110 is equipped with a display. It can be an electronic high-precision digital pressure gauge 110 or a density gauge, and uses an LCD liquid crystal display.

[0029] Pressure gauge 110 is installed at the top air inlet of manual pressure pump 1. The inlet is threaded and sealed with a rubber O-ring.

[0030] The fine-tuning valve 18 is equipped with a pressure relief valve 181 at its end, which can be set with different pressure limits to avoid pressure exceeding the limit during the calibration process and effectively protect the equipment under test.

[0031] The working principle of this utility model is as follows:

[0032] The manual pressure pump 1 is repeatedly pressed. The manual pressure pump 1 is connected to the hose 2 through the air outlet 111. The end of the hose 2 is connected to the density relay 4 through the air passage interface 41. Under the repeated pressing action, the handle 11 of the manual pressure pump 1 is retracted. The handle 11 drives the push rod 14 through the connecting rod 12 to squeeze the gas into the cavity of the air cylinder 17. The compressed gas is filled into the density relay 4 through the hose 2. At one end of the density relay 4, the circuit interface 42 is connected to the multimeter 5 through the test line 3. The multimeter 5 measures the resistance of the density relay 4. The top of the manual pressure pump 1 is connected to the pressure gauge 110 through the conversion connector 5. The pressure gauge 110 detects the air pressure value.

[0033] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A portable pressure calibration device, characterized in that, The device includes a manual pressure pump, a fine-tuning valve, a pressure gauge, a hose, test leads, and a multimeter. The pressure gauge is mounted on the top of the manual pressure pump, and the fine-tuning valve is installed on one side of the manual pressure pump. The hose is connected to the side wall of the manual pressure pump through an air outlet, and the hose is connected to a density relay. The density relay is connected to the multimeter through test leads.

2. The portable pressure calibration device according to claim 1, characterized in that, The manual pressure pump includes an air cylinder, a handle, a connecting rod, a hinge plate, a push rod, and a spring. Two handles are hinged to the bottom of the air cylinder. The handles are movably connected to the connecting rod. The connecting plate is connected to the hinge plate. A push rod is installed at the top of the hinge plate. A push plate is installed at the end of the push rod. The push plate is movably disposed inside the air cylinder.

3. The portable pressure calibration device according to claim 2, characterized in that, A baffle is provided near the hinge plate and on the push rod, and a spring is provided between the baffle and the push rod, with the spring located on the outside of the push rod.

4. A portable pressure calibration device according to claim 2, characterized in that, An adapter is installed at the top of the air cylinder.

5. A portable pressure calibration device according to claim 4, characterized in that, The adapter can be detachably connected to a pressure gauge.

6. A portable pressure calibration device according to claim 2, characterized in that, An air outlet is installed on the side wall of the air cylinder, and the air outlet is connected to a flexible hose.

7. A portable pressure calibration device according to claim 1, characterized in that, The density relay is equipped with a gas path interface, which is connected to a flexible hose.

8. A portable pressure calibration device according to claim 1, characterized in that, The density relay is equipped with a circuit interface, which is connected to the test leads.

9. A portable pressure calibration device according to claim 1, characterized in that, The pressure gauge is equipped with a display.

10. A portable pressure calibration device according to claim 1, characterized in that, A pressure relief valve is installed at the end of the fine-tuning valve.

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