A fully automatic volume resistivity tester

Abstract

The utility model relates to a full-automatic volume resistivity measuring instrument, comprising: an insulating oil constant temperature device, a fire-resistant oil constant temperature device, an insulating oil inlet and sample discharge device, and a fire-resistant oil inlet and sample discharge device; the insulating oil constant temperature device is connected with an insulating oil bottle through the insulating oil inlet and sample discharge device; the fire-resistant oil constant temperature device is connected with the fire-resistant oil bottle through the fire-resistant oil inlet and sample discharge device; the insulating oil inlet and sample discharge device and the fire-resistant oil inlet and sample discharge device all have a quantitative function, including a gear pump, a three-way one-way valve, an air replenishment solenoid valve, a drain valve and a four-way valve; the drain valve and the four-way valve are connected through a pipeline, and the insulating oil and the fire-resistant oil are relatively independent and symmetrically distributed; the problem of absorption difficulty and cross contamination caused by the viscosity difference between the insulating oil and the fire-resistant oil is solved, so as to meet the automatic measurement of the volume resistivity of the insulating oil and the fire-resistant oil of two different types and viscosities, without manual participation in the whole process, with a high degree of automation, which greatly improves the work efficiency and the accuracy of the measurement result.

Description

Technical Field

[0001] The utility model belongs to the technical field of fully automatic measuring instruments for volume resistivity indexes of insulating oil and fire-resistant fuel in petrochemical industry, and in particular relates to a fully automatic volume resistivity measuring instrument for volume resistivity indexes of insulating oil and fire-resistant fuel in petrochemical industry. Background Art

[0002] Volume resistivity reacts sensitively to the ion conduction loss of oil. Whether it is acidic or neutral oxides, it can cause obvious changes in it. Therefore, by measuring the volume resistivity of oil, the oil quality operation can be reliably and effectively monitored. It is an important indicator for judging the aging and contamination degree of oil.

[0003] At present, for this measurement, most instruments require manual sampling, injection, disassembly and assembly, which are cumbersome steps, low efficiency, and the possibility of secondary pollution. Although a few automatic instruments use peristaltic pumps and vacuum pumps to add oil filling, oil discharge and oil sample switching functions, such as CN107121459B, which reduces manual operation and can well meet the measurement of insulating oil, there is a risk of cross-contamination of oil samples or mixed contamination of oil samples and cleaning agents when further measuring fire-resistant oil. Third, the viscosity of fire-resistant oil is much greater than that of insulating oil. Therefore, compared with insulating oil, it is more difficult to automatically inject oil into fire-resistant oil, and there are problems such as inaccurate measurement of oil sample status by time. Fourth, the test temperature of fire-resistant oil is required to be 20°C, and the electrodes in the oil cup are limited by space and cannot have heating or cooling functions at the same time. Therefore, the current automatic volume resistivity tester is mainly used to measure insulating oil, and fire-resistant oil still requires manual participation in injection and disassembly. Utility Model Content

[0004] The purpose of the utility model is to provide a fully automatic volume resistivity measuring instrument, which adopts a brand-new sample feeding and discharging device, solves the problems of absorption difficulty and cross contamination caused by viscosity difference between insulating oil and fire-resistant oil, thereby meeting the automatic measurement of volume resistivity of oil samples of two different types and viscosities, insulating oil and fire-resistant oil, without manual participation in the whole process, with a high degree of automation, greatly improving work efficiency and the accuracy of measurement results.

[0005] The utility model provides a fully automatic volume resistivity tester, comprising:

[0006] An insulating oil constant temperature device (4), a fire-resistant oil constant temperature device (12), an insulating oil inlet and sample discharge device, and a fire-resistant oil inlet and sample discharge device; wherein the insulating oil constant temperature device (4) is connected to the insulating oil bottle (10) via the insulating oil inlet and sample discharge device; and the fire-resistant oil constant temperature device (12) is connected to the fire-resistant oil bottle (11) via the fire-resistant oil inlet and sample discharge device;

[0007] The insulating oil inlet and outlet device and the fire-resistant oil inlet and outlet device both have quantitative functions, and include a gear pump (6), a three-way valve (7), a one-way valve (9), an air supply solenoid valve (8), a drain valve (14) and a four-way valve (15); wherein the drain valve (14) and the four-way valve (15) are connected by a pipeline, and the insulating oil and the fire-resistant oil are relatively independent and symmetrically distributed.

[0008] Preferably, the insulating oil inlet and outlet device and the fire-resistant oil inlet and outlet device further include a waste liquid barrel (16), and the waste liquid barrel (16) is arranged directly below the four-way (15).

[0009] Preferably, the insulating oil constant temperature device (4) comprises an oil cup (20), a bath jacket (22), a sewage discharge inner core (25), a heating element, a temperature measuring element and a fan (27); the heating element and the temperature measuring element are installed on the inside of the oil cup (20) and the bottom surface of the bath jacket (22); a groove for placing the oil cup (20) is opened inside the bath jacket (22), and a plurality of blind holes for installing the heating element and the temperature measuring element are opened on the bottom surface of the bath jacket (22).

[0010] Preferably, the insulating oil thermostat (4) further comprises a casing (24), and the main body of the insulating oil thermostat (4) is fixed on the surface of the casing (24) via a supporting base.

[0011] Preferably, the interior of the bath jacket (22) is filled with thermal insulation material.

[0012] Preferably, the heating element comprises an outer electrode heating element (21) and an inner electrode heating element (29); the outer electrode heating element (21) and the inner electrode heating element (29) are radially inserted at the center of the oil cup (20) from bottom to top.

[0013] Preferably, the temperature measuring element comprises an external electrode temperature measuring element (23) and an internal electrode temperature measuring element (28); the external electrode heating element (21) and the internal electrode heating element (29) are respectively arranged corresponding to the external electrode temperature measuring element (23) and the internal electrode temperature measuring element (28).

[0014] Preferably, a quick connector with a non-return function is installed on the top of the oil cup (20).

[0015] Preferably, an O-ring (26) is provided on the sewage discharge inner core (25), and the O-ring (26) is connected to the oil cup (20) to form a radial seal.

[0016] Preferably, the insulating oil inlet and outlet device and the fire-resistant oil inlet and outlet device further include a liquid level switch (1) and an exhaust solenoid valve (2) which are independent and connected to each other, and the four-way valve (15) is connected to the insulating oil constant temperature device (4) and the fire-resistant oil constant temperature device (12) respectively through the independent liquid level switch (1) and the exhaust solenoid valve (2).

[0017] Beneficial effects of the utility model:

[0018] The utility model provides a new sample feeding and discharging device, which uses a gear pump and a solenoid valve to replace a peristaltic pump and a vacuum pump, thereby avoiding the difficulty of absorbing the fire-resistant oil due to the viscosity difference, and using a liquid level switch to replace the time measurement of the peristaltic pump, so that the quantitative measurement is more accurate. At the same time, the constant temperature device of the fire-resistant oil solves the problem that the internal electrode cannot be heated and cooled at the same time due to space limitations, so that the measurement of the volume resistivity of the fire-resistant oil is more in line with the standard requirements, the accuracy and reproducibility are improved, and the automatic measurement of the index is improved and optimized. At the same time, this device adopts a simple structure to realize the sample feeding and discharging functions, and reduces the manufacturing cost and maintenance cost of the automatic instrument.

[0019] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a fully automatic volume resistivity tester shown in the present utility model.

[0021] Figure 2 This is a schematic structural diagram of the insulating oil constant temperature device shown in the utility model. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] like Figure 1 As shown, this embodiment provides a fully automatic volume resistivity measuring instrument, comprising:

[0024] Insulating oil thermostat 4, fire-resistant oil thermostat 12, insulating oil inlet and outlet device, and fire-resistant oil inlet and outlet device; wherein, the insulating oil thermostat 4 is connected to the insulating oil bottle 10 through the insulating oil inlet and outlet device; the fire-resistant oil thermostat 12 is connected to the fire-resistant oil bottle 11 through the fire-resistant oil inlet and outlet device;

[0025] The insulating oil inlet and outlet sampling devices and the fire-resistant oil inlet and outlet sampling devices all have quantitative functions, including a gear pump 6, a three-way valve 7, a one-way valve 9, an air supply solenoid valve 8, a drain valve 14 and a four-way valve 15; wherein the drain valve 14 and the four-way valve 15 are connected by a pipeline, and the insulating oil and the fire-resistant oil are relatively independent and symmetrically distributed.

[0026] As a preferred embodiment, the insulating oil inlet and outlet device and the fire-resistant oil inlet and outlet device further include a waste liquid barrel 16 , and the waste liquid barrel 16 is arranged directly below the four-way port 15 .

[0027] As a preferred embodiment, the insulating oil constant temperature device 4 includes an oil cup 20, a bath jacket 22, a sewage discharge inner core 25, a heating element, a temperature measuring element and a fan 27. The heating element and the temperature measuring element are installed on the inside of the oil cup 20 and the bottom of the bath jacket 22 at the same time; a groove for placing the oil cup 20 is opened inside the bath jacket 22, and a plurality of blind holes for installing the heating element and the temperature measuring element are opened on the bottom of the bath jacket 22.

[0028] As a preferred embodiment, the insulating oil thermostat 4 further includes a housing 24 , and the main body of the insulating oil thermostat 4 is fixed on the surface of the housing 24 via a supporting base.

[0029] As a preferred embodiment, the interior of the bath jacket 22 is filled with insulation material.

[0030] As a preferred embodiment, the heating element includes an outer electrode heating element 21 and an inner electrode heating element 29 ; the outer electrode heating element 21 and the inner electrode heating element 29 are radially inserted at the center of the oil cup 20 from bottom to top.

[0031] As a preferred embodiment, the temperature measuring element includes an outer electrode temperature measuring element 23 and an inner electrode temperature measuring element 28; the outer electrode heating element 21 and the inner electrode heating element 29 are respectively arranged corresponding to the outer electrode temperature measuring element 23 and the inner electrode temperature measuring element 28.

[0032] As a preferred embodiment, a quick connector with a non-return function is installed on the top of the oil cup 20.

[0033] As a preferred embodiment, an O-ring 26 is provided on the sewage discharge inner core 25, and the O-ring 26 is connected to the oil cup 20 to form a radial seal.

[0034] As a preferred embodiment, the insulating oil inlet and outlet sampling device and the fire-resistant oil inlet and outlet sampling device also respectively include independent and connected liquid level switches 1 and exhaust solenoid valves 2, and the four-way valve 15 is connected to the insulating oil constant temperature device 4 and the fire-resistant oil constant temperature device 12 through the independent liquid level switches 1 and the exhaust solenoid valves 2.

[0035] Working principle of oil inlet and outlet:

[0036] When filling oil, open the gear pump 6 and the exhaust valve 2, and the oil sample enters the insulating oil constant temperature device 4 (or the fire-resistant oil constant temperature device 12) from the three-way 7, the gear pump 6 and the oil inlet 5. After the oil cup is filled, it passes through the overflow port 3, the exhaust valve 2 and the four-way 15 into the waste liquid barrel 16. At this time, the liquid level switch 1 detects the oil sample, the quantitative oil filling is completed, the gear pump 6 is closed, and the constant temperature measurement is started. The gas generated by heating is discharged through the exhaust valve 2. After the experiment is completed, the exhaust valve 2 is closed.

[0037] When draining oil, open the gear pump 6, the drain valve 14 and the air supply valve 8. At this time, due to the one-way valve 9, the oil sample stops at one end of the tee 7 and cannot move forward. After the air enters the oil inlet 5 from the air supply valve 8, the tee 7 and the gear pump 6, the air pressure causes the oil sample of the insulating oil constant temperature device 4 (or the fire-resistant oil constant temperature device 12) to enter the waste liquid barrel 16 from the drain valve 14 and the four-way 15 through the drain port 13. After keeping for a short time, close the drain valve 14, open the exhaust valve 2, and a small amount of residual oil sample passes through the overflow port 3 and enters the waste liquid barrel 16 through the exhaust valve 2. At this time, the liquid level switch 1 detects that there is no oil sample, and the oil drainage is completed, and the gear pump 6, the exhaust valve 2 and the air supply valve 8 are closed.

[0038] Repeat the oil filling and oil draining functions, and replace the oil sample with a cleaning agent to complete the system cleaning function, and then use a constant temperature device to heat and complete the drying.

[0039] Working principle of insulating oil constant temperature device:

[0040] like Figure 2 As shown, the insulating oil constant temperature device comprises an oil cup 20, an outer electrode heating element 21, a bath jacket 22, an outer electrode temperature measuring element 23, a housing 24, a sewage discharge inner core 25, a fan 27, an inner electrode temperature measuring element 28 and an inner electrode heating element 29. The sewage discharge inner core 25 is provided with an O-ring 26 which is connected to the oil cup 20 and forms a radial seal. When filling the oil, the oil sample flows out from the injection port 5 through the overflow port 3. When draining the oil, the oil sample is discharged from the sewage discharge port 13 and the overflow port 3 in turn. When controlling the temperature, the temperature is transferred to the oil cup 20 through the outer electrode heating element 21 on the outside and the heating element 29 on the inside, respectively, to realize bidirectional temperature control of the inner and outer electrodes.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A fully automatic volume resistivity tester, characterized in that: include: An insulating oil constant temperature device (4), a fire-resistant oil constant temperature device (12), an insulating oil inlet and sample discharge device, and a fire-resistant oil inlet and sample discharge device; wherein the insulating oil constant temperature device (4) is connected to the insulating oil bottle (10) via the insulating oil inlet and sample discharge device; and the fire-resistant oil constant temperature device (12) is connected to the fire-resistant oil bottle (11) via the fire-resistant oil inlet and sample discharge device; The insulating oil inlet and outlet device and the fire-resistant oil inlet and outlet device both have quantitative functions, and comprise a gear pump (6), a three-way valve (7), a one-way valve (9), an air supply solenoid valve (8), a drain valve (14) and a four-way valve (15); wherein the drain valve (14) and the four-way valve (15) are connected via a pipeline, and the insulating oil and the fire-resistant oil are relatively independent and symmetrically distributed.

2. A fully automatic volume resistivity tester according to claim 1, characterized in that: The insulating oil inlet and outlet device and the fire-resistant oil inlet and outlet device also include a waste liquid barrel (16), and the waste liquid barrel (16) is arranged directly below the four-way (15).

3. A fully automatic volume resistivity tester according to claim 2, characterized in that: The insulating oil constant temperature device (4) comprises an oil cup (20), a bath jacket (22), a sewage discharge inner core (25), a heating element, a temperature measuring element and a fan (27); the heating element and the temperature measuring element are installed on the inside of the oil cup (20) and the bottom surface of the bath jacket (22); a groove for placing the oil cup (20) is provided inside the bath jacket (22), and a plurality of blind holes for installing the heating element and the temperature measuring element are provided on the bottom surface of the bath jacket (22).

4. A fully automatic volume resistivity tester according to claim 3, characterized in that: The insulating oil thermostat (4) further comprises a casing (24); a main body of the insulating oil thermostat (4) is fixed on the surface of the casing (24) via a supporting base.

5. A fully automatic volume resistivity tester according to claim 4, characterized in that: The interior of the bath jacket (22) is filled with heat-insulating material.

6. A fully automatic volume resistivity tester according to claim 5, characterized in that: The heating element comprises an outer electrode heating element (21) and an inner electrode heating element (29); the outer electrode heating element (21) and the inner electrode heating element (29) are radially inserted at the center of the oil cup (20) from bottom to top.

7. A fully automatic volume resistivity tester according to claim 6, characterized in that: The temperature measuring element comprises an outer electrode temperature measuring element (23) and an inner electrode temperature measuring element (28); the outer electrode heating element (21) and the inner electrode heating element (29) are respectively arranged corresponding to the outer electrode temperature measuring element (23) and the inner electrode temperature measuring element (28).

8. A fully automatic volume resistivity tester according to claim 7, characterized in that: A quick connector with a non-return function is installed on the top of the oil cup (20).

9. A fully automatic volume resistivity tester according to claim 8, characterized in that: An O-ring (26) is arranged on the sewage discharge inner core (25), and the O-ring (26) is connected to the oil cup (20) to form a radial seal.

10. A fully automatic volume resistivity tester according to claim 9, characterized in that: The insulating oil inlet and outlet device and the fire-resistant oil inlet and outlet device also respectively include a liquid level switch (1) and an exhaust solenoid valve (2) which are independent and connected to each other. The four-way valve (15) is connected to the insulating oil constant temperature device (4) and the fire-resistant oil constant temperature device (12) respectively through the independent liquid level switch (1) and the exhaust solenoid valve (2).

Images