Portable low-voltage electric appliance detector

Abstract

The invention belongs to the technical field of charging pile testing, and particularly relates to a portable low-voltage electric appliance detector, which comprises a machine body and a group of testing chucks electrically connected with the machine body through detachable cables, and further comprises a lifting handle seat arranged above the machine body, a strip-shaped holding hole is formed in the side wall of the lifting handle seat, and the lifting handle seat is arranged in the strip-shaped holding hole. And a liquid storage cavity is formed in the lifting handle seat, absolute ethyl alcohol is filled in the liquid storage cavity, and a mounting groove is formed in the side wall of the lifting handle seat. The insulation resistance tester can be conveniently carried by a worker, impurities on a low-voltage apparatus contact and an equipment metal shell can be rapidly cleaned, the insulation resistance detection accuracy is guaranteed, meanwhile, dust and residual absolute ethyl alcohol can be assisted to be cleaned, the test result is prevented from being influenced, in addition, the insulation resistance tester can be flexibly adapted to operation in a narrow space, and the working efficiency is improved. And the waste of time for cleaning the impurities is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of charging pile testing, and in particular relates to a portable low-voltage electrical appliance tester. Background Art

[0002] During long-term operation, the insulation layer of low-voltage electrical appliances (such as relays, contactors, etc.) in new energy vehicle charging piles is prone to aging and damage due to temperature rise, moisture, dust, etc., leading to leakage, short circuit or electric shock risks. Therefore, after the charging pile is manufactured, it is necessary to conduct insulation resistance testing on the low-voltage electrical appliances of the charging pile to detect insulation defects in a timely manner. This is a necessary means to ensure the safe and stable operation of the equipment.

[0003] Currently, when performing insulation resistance tests on low-voltage electrical appliances in charging piles, an insulation resistance tester is generally used. The tester applies a DC voltage to the object being tested through an internal high-voltage power supply, measures the weak current flowing through the insulating medium, and then calculates the insulation resistance value according to Ohm's law to determine whether the insulation resistance of the low-voltage electrical appliance being tested meets the requirements. For example, an intelligent insulation resistance tester is disclosed in patent publication number CN116593780B.

[0004] During the manufacturing process of charging piles, low-voltage electrical test contacts are easily affected by various factors and produce impurities, such as residual flux from welding, fingerprints and oil stains left by operators, and dust and moisture deposition in the environment. If these impurities are not cleaned, they will interfere with the normal contact between the insulation resistance tester and the contacts, resulting in inaccurate measurement results. Carrying special cleaning tools will reduce the convenience of carrying the tester and make the operation process more cumbersome. Summary of the Invention

[0005] The purpose of the present invention is to provide a portable low-voltage electrical appliance detector in view of the above problems.

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solution: a portable low-voltage electrical appliance tester, comprising a body and a set of test chucks, wherein the test chucks are electrically connected to the body via a detachable cable, and further comprising:

[0007] A handle base is provided above the body, a strip-shaped gripping hole is provided on a side wall of the handle base, a liquid storage cavity is provided inside the handle base, and the liquid storage cavity is filled with anhydrous ethanol, and a mounting groove is provided on a side wall of the handle base;

[0008] A mounting block is detachably mounted inside the mounting groove, a liquid groove is formed at the end of the mounting block, a liquid injection hole is formed on the wall of the liquid groove, a nozzle is fixedly mounted at the end of the liquid injection hole, a discharge one-way valve is mounted inside the liquid injection hole, and an inlet assembly is mounted at the bottom of the liquid groove;

[0009] A pressing component is installed inside the bar-shaped holding hole, and the pressing component is connected to the liquid tank;

[0010] The heating component is installed on the bottom of the installation block, and the heating end of the heating component is arranged inside the liquid injection hole.

[0011] Preferably, the entry assembly includes a three-way pipe fixedly inserted at the bottom of the mounting block, and the liquid outlet end of the three-way pipe is connected to the interior of the liquid tank, a liquid outlet hole is provided on the lower side of the cavity wall of the liquid storage cavity, and the liquid outlet hole is connected to the liquid inlet end of the three-way pipe, a liquid inlet one-way valve is fixedly installed inside the liquid inlet end of the three-way pipe, an air inlet one-way valve is fixedly installed inside the air inlet end of the three-way pipe, and a manual three-way valve is installed inside the three-way pipe at a position between the liquid outlet end, the liquid inlet end and the air inlet end.

[0012] Preferably, the pressing assembly includes a support cover, the lower hole wall of the strip-shaped holding hole is provided with a through hole matching the liquid tank, and the support cover is threadedly connected to the hole wall of the through hole, a piston is slidably connected to the inside of the through hole, a pressing rod is fixedly installed on the top of the piston, and the pressing rod is slidably connected to the support cover, and a support spring is fixedly arranged between the piston and the support cover.

[0013] Preferably, the heating assembly includes an insulating block fixedly plugged into the bottom of the mounting block, and an electric heating element is installed inside the insulating block, the heating end of the electric heating element extends to the inside of the injection hole, a battery assembly is installed at the bottom of the insulating block, a microcontroller is provided inside the mounting slot, and the battery assembly supplies power to the electric heating element through the microcontroller.

[0014] Preferably, the interior of the strip-shaped holding hole is slidably connected to a U-shaped block, the top of the pressing rod is arranged on the inner side of the U-shaped block, an inner wall on one side of the U-shaped block is provided with an inclined extrusion surface, and the side wall of the inclined extrusion surface is in sliding contact with one side of the top of the pressing rod, a cylinder is fixedly inserted into the hole wall of the strip-shaped holding hole, and a reset spring is fixedly arranged between the inner wall of the cylinder and the side wall of the U-shaped block, and a T-shaped hand pull rod is fixedly installed on the side wall of the U-shaped block away from the reset spring.

[0015] Preferably, a threaded column is fixedly installed on the bottom of the handle seat, a threaded hole matching the threaded column is opened on the top of the body, and the handle seat is detachably connected to the body through the threaded column and the threaded hole.

[0016] Preferably, the lower cavity wall of the liquid storage cavity is integrally formed with a cylinder, and the cylinder and the threaded column are jointly provided with a receiving groove, the interior of the receiving groove is fixedly connected to an internal threaded ring, and the internal threaded ring is threadedly assembled with a screw, a round block is installed at the bottom of the screw, and a scraper blade is fixedly installed at the bottom of the round block.

[0017] Preferably, a box body is fixedly installed on the lower groove wall of the installation groove, and the box body is connected to the air inlet end of the tee pipe, the microcontroller is fixedly installed on the side wall of the box body, and an air inlet hole is provided on the side wall of the box body away from the tee pipe. An ethanol detection probe is installed on the top of the box body, and the detection end of the ethanol detection probe is arranged inside the box body, the ethanol detection probe is electrically connected to the microcontroller, and a dust filter is installed inside the air inlet hole.

[0018] Compared with existing technologies, the advantages of a portable low-voltage electrical appliance tester are:

[0019] 1. The cooperation among the provided body, test chuck, handle seat and bar-shaped holding hole makes it convenient for personnel to carry the body, and the cooperation among the provided liquid storage chamber, anhydrous ethanol, mounting groove, mounting block, liquid tank, nozzle, discharge one-way valve, entry assembly and pressing assembly makes it convenient to clean up impurities such as oil, rust, etc. by spraying anhydrous ethanol when there are dirt and impurities on the contacts of low-voltage electrical appliances and the metal casing of the equipment, thereby preventing these impurities from affecting the accuracy of subsequent insulation resistance detection of low-voltage electrical appliances.

[0020] 2. The heating component is set up in conjunction with the design of the three-way pipe, which can cooperate with the airflow to assist in cleaning dust and other impurities, and can also assist in cleaning residual anhydrous ethanol to prevent anhydrous ethanol from affecting the insulation resistance test.

[0021] 3. The handle seat can be removed through the provided threaded column and threaded hole, which facilitates operation in a narrow space and reduces the operating burden. Through the mutual cooperation of the provided cylinder, storage groove, internal thread ring, screw and scraper blade, some firmly attached impurities can be easily cleaned off.

[0022] 4. Through the cooperation of the box body, air inlet and ethanol detection probe, it is convenient to detect whether the anhydrous ethanol around the low-voltage electrical appliance has been cleaned up, thereby ensuring that the anhydrous ethanol has been cleaned up and reducing time waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of a portable low-voltage electrical appliance detector provided by the present invention;

[0024] Figure 2 This is a structural schematic diagram of a portable low-voltage electrical appliance tester provided by the present invention after the handle base and the body are separated;

[0025] Figure 3 This is a schematic diagram of the internal structure of a handle base of a portable low-voltage electrical appliance tester provided by the present invention;

[0026] Figure 4The present invention provides a portable low-voltage electrical appliance detector Figure 3 A magnified view of the structure of part A;

[0027] Figure 5 The present invention provides a portable low-voltage electrical appliance detector Figure 1 A magnified view of the structure of part B.

[0028] In the figure: 1 body, 2 test chuck, 3 handle seat, 4 bar grip hole, 5 liquid storage chamber, 6 mounting slot, 7 mounting block, 8 liquid tank, 9 liquid injection hole, 10 nozzle, 11 discharge check valve, 12 inlet assembly, 121 three-way pipe, 122 liquid outlet hole, 123 liquid inlet check valve, 124 air inlet check valve, 125 manual three-way valve, 13 pressing assembly, 131 support cover, 132 through hole, 133 piston, 134 pressing rod, 135 support Support spring, 14 heating component, 141 insulation block, 142 electric heating element, 143 battery assembly, 144 microcontroller, 15 U-shaped block, 16 inclined extrusion surface, 17 cylinder, 18 return spring, 19 T-shaped hand rod, 20 threaded column, 21 threaded hole, 22 cylinder, 23 storage groove, 24 internal thread ring, 25 screw, 26 round block, 27 scraper blade, 28 box body, 29 air inlet, 30 ethanol detection probe, 31 dust filter. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] like Figure 1-Figure 5As shown, a portable low-voltage electrical appliance tester includes a body 1 and a set of test chucks 2, the test chucks 2 are electrically connected to the body 1 through a detachable cable, and also includes: a handle seat 3, the handle seat 3 is arranged above the body 1, the side wall of the handle seat 3 is provided with a strip-shaped holding hole 4, the interior of the handle seat 3 is provided with a liquid storage cavity 5, and the interior of the liquid storage cavity 5 is filled with anhydrous ethanol, the side wall of the handle seat 3 is provided with a mounting groove 6, the mounting block 7 is detachably mounted inside the mounting groove 6, the end of the mounting block 7 is provided with a liquid tank 8, and the tank wall of the liquid tank 8 is provided with a liquid injection hole 9, and a nozzle 10 is fixedly installed at the hole end of the liquid injection hole 9, and a discharge one-way valve 11 is installed inside the liquid injection hole 9, and the bottom of the liquid tank 8 An entry component 12 is installed, and the entry component 12 includes a three-way pipe 121 fixedly inserted at the bottom of the mounting block 7, and the liquid outlet end of the three-way pipe 121 is connected to the interior of the liquid tank 8, and a liquid outlet hole 122 is provided on the lower side of the cavity wall of the liquid storage cavity 5, and the liquid outlet hole 122 is connected to the liquid inlet end of the three-way pipe 121, and a liquid inlet one-way valve 123 is fixedly installed inside the liquid inlet end of the three-way pipe 121, and an air inlet one-way valve 124 is fixedly installed inside the air inlet end of the three-way pipe 121, and a manual three-way valve 125 is installed inside the three-way pipe 121 at a position between the liquid outlet end, the liquid inlet end and the air inlet end. The manual three-way valve 125 can switch the air inlet end or the liquid inlet end of the three-way pipe 121 to be connected to the liquid tank 8.

[0031] The pressing assembly 13 is installed inside the strip-shaped holding hole 4, and the pressing assembly 13 is connected to the liquid tank 8. The pressing assembly 13 includes a support cover 131. The lower hole wall of the strip-shaped holding hole 4 is provided with a through hole 132 matching the liquid tank 8, and the support cover 131 is threadedly connected to the hole wall of the through hole 132. A piston 133 is slidably connected to the inside of the through hole 132. A pressing rod 134 is fixedly installed on the top of the piston 133, and the pressing rod 134 is slidably connected to the support cover 131. A support spring 135 is fixedly arranged between the piston 133 and the support cover 131. The through hole 132 has the same diameter as the liquid tank 8.

[0032] The heating component 14 is installed at the bottom of the mounting block 7, and the heating end of the heating component 14 is arranged inside the injection hole 9. The heating component 14 includes an insulating block 141 fixedly plugged into the bottom of the mounting block 7, and an electric heating element 142 is installed inside the insulating block 141. The heating end of the electric heating element 142 extends to the inside of the injection hole 9. A battery assembly 143 is installed at the bottom of the insulating block 141. A microcontroller 144 is provided inside the mounting slot 6, and the battery assembly 143 supplies power to the electric heating element 142 through the microcontroller 144. The battery assembly 143 needs to be charged regularly. A small display screen is provided at the microcontroller 144 for displaying the remaining power of the battery assembly 143.

[0033] The inside of the strip-shaped holding hole 4 is slidingly connected to a U-shaped block 15, and the top of the pressing rod 134 is arranged on the inner side of the U-shaped block 15. An inner wall on one side of the U-shaped block 15 is provided with an inclined extrusion surface 16, and the side wall of the inclined extrusion surface 16 is in sliding contact with one side of the top of the pressing rod 134. A cylinder 17 is fixedly inserted into the hole wall of the strip-shaped holding hole 4, and a return spring 18 is fixedly provided between the inner wall of the cylinder 17 and the side wall of the U-shaped block 15. A T-shaped hand pull rod 19 is fixedly installed on the side wall of the U-shaped block 15 away from the return spring 18, which drives the pressing rod 134 to move in the vertical direction by pulling horizontally, so that the pressing rod 134 can be moved vertically, thereby improving the convenience of operation.

[0034] A threaded column 20 is fixedly installed at the bottom of the handle base 3, and a threaded hole 21 matching the threaded column 20 is opened on the top of the body 1. The handle base 3 is detachably connected to the body 1 through the threaded column 20 and the threaded hole 21, so that the handle base 3 can be easily separated from the body 1. When cleaning impurities separately, you only need to hold the handle base 3, which reduces the operating burden.

[0035] The lower cavity wall of the liquid storage cavity 5 is integrally formed with a cylinder 22, and the cylinder 22 and the threaded column 20 jointly form a receiving groove 23. The interior of the receiving groove 23 is fixedly connected to an internal threaded ring 24, and the internal threaded ring 24 is threadedly assembled with a screw 25. A round block 26 is installed at the bottom of the screw 25, and a scraper blade 27 is fixedly installed at the bottom of the round block 26. The scraper blade 27 can be used to clean some firmly attached impurities.

[0036] A box body 28 is fixedly installed on the lower groove wall of the mounting groove 6, and the box body 28 is connected to the air inlet end of the three-way pipe 121. The microcontroller 144 is fixedly installed on the side wall of the box body 28. An air inlet hole 29 is provided on the side wall of the box body 28 away from the three-way pipe 121. An ethanol detection probe 30 is installed on the top of the box body 28, and the detection end of the ethanol detection probe 30 is arranged inside the box body 28. The ethanol detection probe 30 is electrically connected to the microcontroller 144. A dust filter 31 is installed inside the air inlet hole 29. The dust filter 31 can intercept dust and other impurities in the air entering the box body 28 to ensure the cleanliness of the air entering the box body 28. The dust filter 31 is detachable from the air inlet hole 29, and the dust on the surface of the dust filter 31 can be cleaned by shaking the handle seat 3.

[0037] The operating principle of the present invention is now explained as follows: when testing the low-voltage electrical appliances inside the charging pile, such as relays, contactors, etc., first observe whether there are impurities on the contacts of the low-voltage electrical appliances and the metal casing of the charging pile. If there are impurities, these impurities need to be cleaned to avoid affecting the subsequent insulation resistance test. When cleaning the impurities, twist the handle seat 3 to separate the threaded column 20 from the threaded hole 21, so that the handle seat 3 can be removed from the body 1, and then hold the handle seat 3 and pull the T-shaped hand pull rod 19 with your fingers to move. The T-shaped hand pull rod 19 will drive the U-shaped block 15 to move, and the inclined extrusion surface 16 of the U-shaped block 15 will squeeze the pressing rod 134, so that the pressing rod 134 drives the piston 133 to move downward. When the piston 133 moves downward, it will squeeze the space inside the liquid tank 8. At this time, the liquid tank 8 is filled with liquid. The air in the nozzle 10 will be ejected from the nozzle 10 through the liquid injection hole 9 and the discharge one-way valve 11. The ejected air flow can be used to pre-clean some impurities such as dust attached to the detection point. After pulling the T-shaped hand pull rod 19 once, release the T-shaped hand pull rod 19. Under the action of the reset spring 18 and the support spring 135, the U-shaped block 15 and the pressing rod 134 move back and reset. At this time, since the piston 133 moves up and resets, the internal space of the liquid tank 8 increases. Under the action of the internal and external pressure difference, the discharge one-way valve 11 and the air inlet one-way valve 124, the external air is replenished into the liquid tank 8 through the three-way pipe 121 (initially, the air inlet end of the three-way pipe 121 is connected to the liquid tank 8). Then, the U-shaped block 15 is repeatedly pulled to move, so that the nozzle 10 continues to eject air flow, thereby cleaning dust and other impurities.

[0038] After the dust and other impurities are cleaned, the staff turns the manual three-way valve 125 to connect the liquid inlet end of the three-way pipe 121 with the liquid tank 8. At this time, when the staff repeatedly pulls the U-shaped block 15 to move through the T-shaped hand pull rod 19, under the action of negative pressure, the anhydrous ethanol inside the liquid storage chamber 5 will enter the liquid tank 8 through the three-way pipe 121, so that the anhydrous ethanol will eventually be sprayed out from the nozzle 10. The sprayed anhydrous ethanol can be used to dissolve and clean impurities such as oil stains (anhydrous ethanol is a polar organic solvent that can dissolve organic impurities such as oil stains and flux residues, and can also be miscible with water to take away moisture on the surface of dust). In addition, the anhydrous ethanol can evaporate quickly without leaving any residue, avoiding the introduction of new impurities that affect the test.

[0039] After the anhydrous ethanol spraying is completed, the staff member turns the manual three-way valve 125 again, and the nozzle 10 is re-sprung with airflow. At the same time, the staff member starts the microcontroller 144, which controls the electric heating element 142 to start working. The heating temperature of the electric heating element 142 is 60° C. The electric heating element 142 can heat the airflow flowing through the liquid injection hole 9. The heated hot airflow can accelerate the volatilization of the anhydrous ethanol, thereby improving the cleaning efficiency. At the same time, the heated airflow can increase the temperature around the low-voltage electrical appliance. The increased temperature, based on the principle of thermal expansion and contraction, can promote the early exposure of insulation defects in the low-voltage electrical appliance (for example, the air at the insulation crack expands due to heat, causing the crack to become larger, thereby promoting the exposure of the defect);

[0040] At the same time, the external air enters the three-way pipe 121 through the air inlet 29 of the box body 28, and after the microcontroller 144 is started, it will synchronously control the ethanol detection probe 30 to work. Since the air around the low-voltage electrical appliance detection point is sucked into the three-way pipe 121 through the air inlet 29 and the box body 28, the air containing volatile anhydrous ethanol around the low-voltage electrical appliance will flow through the ethanol detection probe 30. The ethanol detection probe 30 emits infrared rays and calculates the infrared intensity received by the receiving end, thereby measuring the concentration of anhydrous ethanol in the air. When the concentration of anhydrous ethanol is lower than 5%, the ethanol detection probe 30 will feedback an electrical signal to the microcontroller 144. At this time, the microcontroller The timing module of the device 144 will start timing. After the timing reaches 15 seconds, it means that the anhydrous ethanol around the low-voltage electrical appliance has been fully cleaned. If the timing does not reach 15 seconds, it means that the anhydrous ethanol around the low-voltage electrical appliance has not been fully cleaned. At this time, it is necessary to continue to clean the anhydrous ethanol by hot air flow until the microcontroller 144 receives the electrical signal fed back by the ethanol detection probe 30 and the continuous timing reaches 15 seconds. At this time, the microcontroller 144 will sound an alarm through its own alarm module. After receiving the reminder message, the staff can stop cleaning the anhydrous ethanol, and then turn off the microcontroller 144. The electric heating element 142 and the ethanol detection probe 30 will stop working synchronously;

[0041] If there are still some firmly attached impurities at the low-voltage electrical appliance inspection point, the staff can twist the round block 26 to separate the screw 25 from the internal thread ring 24, and then use the scraper blade 27 to scrape and clean the firmly attached impurities;

[0042] Taking the insulation resistance test of the relay of the charging pile as an example, after the impurities at the relay detection point are cleaned, the staff connects the test chuck 2 to the body 1 through a cable, and then connects one test chuck 2 to the relay coil terminal, and the other test chuck 2 to the relay metal shell or ground terminal. Set the body 1 to a suitable voltage level such as 500V or 1000V, start the test, and after the pointer or value stabilizes, read the insulation resistance value and compare it with the standard value to determine whether the insulation performance of the relay meets the standard. After the test is completed, disconnect the power supply of the body 1 first, and then remove the test chuck 2. The test is now completed. By accurately detecting the insulation resistance of the low-voltage electrical appliances of the charging pile, it can be determined whether its insulation resistance meets the use requirements.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A portable low-voltage electrical appliance tester, comprising a body (1) and a set of test chucks (2), wherein the test chucks (2) are electrically connected to the body (1) via a detachable cable, characterized in that: Also includes: A handle seat (3) is arranged above the body (1), a strip-shaped gripping hole (4) is provided on the side wall of the handle seat (3), a liquid storage cavity (5) is provided inside the handle seat (3), and the liquid storage cavity (5) is filled with anhydrous ethanol, and a mounting groove (6) is provided on the side wall of the handle seat (3); A mounting block (7) is detachably mounted inside the mounting groove (6); a liquid groove (8) is provided at the end of the mounting block (7); a liquid injection hole (9) is provided on the wall of the liquid groove (8); a nozzle (10) is fixedly mounted at the end of the liquid injection hole (9); a discharge check valve (11) is installed inside the liquid injection hole (9); and an inlet assembly (12) is installed at the bottom of the liquid groove (8); A pressing assembly (13) is installed inside the strip-shaped holding hole (4), and the pressing assembly (13) is connected to the liquid tank (8); A heating component (14) is installed at the bottom of the installation block (7), and a heating end of the heating component (14) is arranged inside the liquid injection hole (9).

2. A portable low-voltage electrical appliance detector according to claim 1, characterized in that: The inlet assembly (12) comprises a three-way pipe (121) fixedly plugged into the bottom of the mounting block (7), and the liquid outlet end of the three-way pipe (121) is connected to the interior of the liquid tank (8); a liquid outlet hole (122) is provided on the lower side of the cavity wall of the liquid storage cavity (5), and the liquid outlet hole (122) is connected to the liquid inlet end of the three-way pipe (121); a liquid inlet check valve (123) is fixedly installed inside the liquid inlet end of the three-way pipe (121); an air inlet check valve (124) is fixedly installed inside the air inlet end of the three-way pipe (121); and a manual three-way valve (125) is installed inside the three-way pipe (121) at a position between the liquid outlet end, the liquid inlet end and the air inlet end.

3. A portable low-voltage electrical appliance detector according to claim 1, characterized in that: The pressing assembly (13) includes a support cover (131), a through hole (132) matching the liquid tank (8) is provided on the lower hole wall of the strip-shaped holding hole (4), and the support cover (131) is threadedly connected to the hole wall of the through hole (132), a piston (133) is slidably connected inside the through hole (132), a pressing rod (134) is fixedly installed on the top of the piston (133), and the pressing rod (134) is slidably connected to the support cover (131), and a support spring (135) is fixedly arranged between the piston (133) and the support cover (131).

4. A portable low-voltage electrical appliance detector according to claim 2, characterized in that: The heating assembly (14) comprises a heat-insulating block (141) fixedly plugged into the bottom of the mounting block (7), an electric heating element (142) is installed inside the heat-insulating block (141), a heating end of the electric heating element (142) extends into the interior of the liquid injection hole (9), a battery assembly (143) is installed at the bottom of the heat-insulating block (141), a microcontroller (144) is provided inside the mounting slot (6), and the battery assembly (143) supplies power to the electric heating element (142) via the microcontroller (144).

5. A portable low-voltage electrical appliance detector according to claim 3, characterized in that: The interior of the strip-shaped holding hole (4) is slidably connected to a U-shaped block (15), the top of the pressing rod (134) is arranged on the inner side of the U-shaped block (15), an inner wall of one side of the U-shaped block (15) is provided with an inclined extrusion surface (16), and the side wall of the inclined extrusion surface (16) is in sliding contact with one side of the top of the pressing rod (134), a cylinder (17) is fixedly inserted into the hole wall of the strip-shaped holding hole (4), and a reset spring (18) is fixedly arranged between the inner wall of the cylinder (17) and the side wall of the U-shaped block (15), and a T-shaped hand pull rod (19) is fixedly installed on the side wall of the U-shaped block (15) away from the reset spring (18).

6. A portable low-voltage electrical appliance detector according to claim 1, characterized in that: A threaded column (20) is fixedly mounted on the bottom of the handle seat (3), a threaded hole (21) matching the threaded column (20) is provided on the top of the machine body (1), and the handle seat (3) is detachably connected to the machine body (1) via the threaded column (20) and the threaded hole (21).

7. A portable low-voltage electrical appliance detector according to claim 6, characterized in that: The lower cavity wall of the liquid storage cavity (5) is integrally formed with a cylinder (22), and the cylinder (22) and the threaded column (20) are jointly provided with a receiving groove (23), the interior of the receiving groove (23) is fixedly connected with an internal threaded ring (24), and the internal threaded ring (24) is threadedly assembled with a screw (25), the bottom of the screw (25) is installed with a round block (26), and the bottom of the round block (26) is fixedly installed with a scraper blade (27).

8. A portable low-voltage electrical appliance detector according to claim 4, characterized in that: A box body (28) is fixedly mounted on the lower side wall of the mounting groove (6), and the box body (28) is connected to the air inlet end of the three-way pipe (121). The microcontroller (144) is fixedly mounted on the side wall of the box body (28). An air inlet hole (29) is provided on the side wall of the box body (28) away from the three-way pipe (121). An ethanol detection probe (30) is mounted on the top of the box body (28), and the detection end of the ethanol detection probe (30) is arranged inside the box body (28). The ethanol detection probe (30) is electrically connected to the microcontroller (144), and a dust filter (31) is mounted inside the air inlet hole (29).

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