Partial discharge tester

Abstract

The invention relates to the technical field of test equipment, in particular to a partial discharge tester, which comprises a tester body, a sensor, a protection assembly and a pushing assembly, and is characterized in that the top surface of the tester body is provided with a detection boss; the sensor is arranged on the top surface of the detection boss; the protection assembly comprises a maintaining spring, a movable shell and a plurality of protection rods, the movable shell is slidably connected to the instrument body, a receding through hole is formed in the top face of the movable shell and located above the sensor, a movable whole cavity and a movable whole groove are formed in the movable shell, the movable whole groove is located in one side of the movable whole cavity and communicated with the movable whole cavity, and the protection rods are arranged in the movable whole cavity. The movable whole groove and the movable whole cavity are communicated with the receding through hole, the multiple protection rods are sequentially arranged in the movable whole cavity, one end of each protection rod is slidably connected to the movable whole groove, and the two ends of the maintaining spring are connected to the instrument body and the movable shell respectively. The pushing assembly is connected to any one of the protection rods, and the pushing assembly is provided with a downward pressing speed; in conclusion, the damage risk of the sensor on the partial discharge tester is low.

Description

Technical Field

[0001] The invention relates to the technical field of testing equipment, in particular to a partial discharge tester. Background Art

[0002] At present, the partial discharge tester is a device used to detect partial discharge phenomena in the insulation system of electrical equipment. Partial discharge refers to the current discharge phenomenon that occurs in a small area inside or on the surface of the insulating material, which is usually an early sign of insulation aging, defects or other problems.

[0003] Some portable handheld partial discharge testers are equipped with transient earth voltage sensors (TEV sensors) to increase the accuracy and reliability of detection. The TEV sensor determines the discharge situation inside the equipment by detecting high-frequency partial discharge signals on the surface of the metal cabinet. Therefore, in order to detect more accurately, the TEV sensor is often required to be placed close to the surface of the metal cabinet, which results in the TEV sensor being generally exposed. If the partial discharge tester falls, the TEV sensor may be subjected to severe impact, thereby damaging the TEV sensor. Summary of the invention

[0004] The object of the present invention is to provide a partial discharge tester to solve the technical problem that when the partial discharge tester provided with a TEV sensor falls, the TEV sensor is easily damaged.

[0005] In order to achieve the above object, the present invention provides a partial discharge tester, comprising:

[0006] An instrument body, wherein a detection boss is provided on the top surface of the instrument body;

[0007] A sensor, wherein the sensor is disposed on the top surface of the detection boss;

[0008] A protection component, the protection component includes a maintenance spring, a movable shell and a plurality of protection rods, the movable shell is slidably connected to the instrument body in the up-down direction, the top surface of the movable shell is provided with a clearance through hole corresponding to the detection boss, the clearance through hole is located above the sensor, a movable whole cavity and a movable whole groove are provided in the movable shell, the movable whole groove is located on one side of the movable whole cavity and is connected to the movable whole cavity, the movable whole groove and the movable whole cavity are connected to the clearance through hole, a plurality of the protection rods are sequentially arranged in the movable whole cavity, one end of the protection rod is slidably connected to the movable whole groove, the two ends of the maintenance spring are respectively connected to the instrument body and the movable shell, the maintenance spring is used to apply a continuous upward force to the movable shell so that the clearance through hole is continuously located above the sensor;

[0009] A pushing component, the pushing component is connected to any of the protection rods, and the pushing component is configured with a downward pressing speed;

[0010] When the movable housing moves downward at a speed not greater than the downward pressing speed until the movable housing abuts against the instrument body, the top surface of the movable housing is not higher than the top surface of the sensor;

[0011] When the movable housing moves downward at a speed greater than the downward pressing speed, the pushing component pushes any of the protection rods to move any of the protection rods to above the sensor.

[0012] Optionally, a rod slider is provided at one end of the protective rod, and the rod slider is slidably connected to the movable entire groove, two adjacent rod sliders are connected, and adjacent protective rods are connected in sequence through the rod slider and are arranged at intervals.

[0013] Optionally, the movable shell includes a first protective plate and a second protective plate, the first protective plate is located above the instrument body, the top of the second protective plate is fixedly connected to the bottom surface of one end of the first protective plate, the second protective plate is slidably connected to the instrument body along the up and down directions, the make way through hole is provided in the first protective plate, and the make way through hole passes through the first protective plate along the up and down directions, the movable whole cavity includes a first movable cavity and a second movable cavity, the movable whole groove includes a first movable groove and a second movable groove, the first movable cavity and the first movable groove are provided in the first protective plate, the first movable cavity and the first movable groove are extended along the length direction of the first protective plate, the second movable cavity and the second movable groove are provided in the second protective plate, the second movable cavity and the second movable groove are extended along the length direction of the first protective plate, one end of the first movable cavity is connected to one end of the second movable cavity, the first movable cavity and the first movable groove are connected, the second movable cavity and the second movable groove are connected, and a plurality of protective rods are sequentially provided in the second movable cavity, and one end of the protective rod is slidably connected to the second movable groove.

[0014] Optionally, a transition cavity is provided between the first movable cavity and the second movable cavity. The second movable cavity, the transition cavity, and the first movable cavity are communicated in sequence. An angle between the extending direction of the first movable cavity and the extending direction of the transition cavity is between 10° and 80°. An angle between the extending direction of the second movable cavity and the extending direction of the transition cavity is between 10° and 80°. A transition groove is provided between the first movable groove and the second movable groove. The second movable groove, the transition groove, and the first movable groove are communicated in sequence. An angle between the extending direction of the first movable groove and the extending direction of the transition groove is between 10° and 80°. An angle between the extending direction of the second movable groove and the extending direction of the transition groove is between 10° and 80°. Adjacent two of the rod sliders are rotatably connected to each other.

[0015] Optionally, the protection assembly further includes a fixed outer shell, which is provided on one side of the instrument body and fixedly connected to the instrument body. A sliding cavity is formed between the fixed outer shell and the instrument body. The top of the sliding cavity is provided with a sliding cavity opening that penetrates upward to the outside. The movable outer shell passes through the sliding cavity opening and extends into the sliding cavity. The movable outer shell is slidably connected to the sliding cavity in the up-and-down direction.

[0016] Optionally, a maintaining groove is provided on the side surface of the fixed outer shell relative to the instrument body. The maintaining groove communicates with the sliding cavity. The second protection plate is provided with a maintaining convex block, which is located in the maintaining groove. The maintaining spring is provided in the maintaining groove. Two ends of the maintaining spring are respectively connected to the maintaining convex block and the groove wall of the maintaining groove to apply a continuously upward force to the movable outer shell.

[0017] Optionally, the pushing assembly includes a compression bottle, a telescopic bladder, a push rod, and a support tube. The telescopic bladder, the push rod, and the support tube are provided in the movable integral cavity. The support tube is vertically provided on the ground of the movable integral cavity and sleeved outside the telescopic bladder. The top end of the telescopic bladder is connected to the push rod. The push rod is located below each protection rod. The compression bottle is connected to the telescopic bladder. The compression bottle is used to input gas into the telescopic bladder.

[0018] When the compression bottle inputs gas into the telescopic bladder, the telescopic bladder elongates in the up-and-down direction, so that the push rod moves upward, and further the push rod pushes the protection rod to move along the length direction of the movable integral cavity.

[0019] Optionally, the pushing component further includes a compression shell, a compression plate, a first one-way valve, and a second one-way valve. The top surface of the compression shell is provided with a compression hole matching the compression plate. The compression plate is arranged in the compression hole. The outer surface of the compression shell is provided with a compression inlet and a compression outlet communicating with the compression hole. The compression inlet is provided with the first one-way valve, and the setting direction of the one-way valve is from the compression inlet to the compression hole. The compression outlet is provided with the second one-way valve, and the setting direction of the second one-way valve is from the compression hole to the compression outlet. The compression plate is connected to the compression bottle through the compression outlet. The compression shell and the compression plate are located below the movable shell, and the top surface of the compression plate is connected to the bottom surface of the movable shell;

[0020] When the movable shell moves downward, the compression plate is moved downward, so as to convey the gas in the compression hole into the compression bottle;

[0021] When the movable shell moves upward, the compression plate is moved upward, so as to convey the external gas into the compression hole.

[0022] Optionally, an accommodation cavity is provided in the compression bottle. The outer surface of the compression bottle is provided with an air delivery opening penetrating through to the accommodation cavity, and the air delivery opening is connected to the telescopic bladder;

[0023] The second one-way valve includes a first valve body, a first sealing ball, a first valve spring, a first support disk, a first retaining ring, and a first ejector rod. The first valve body is provided with a first valve through hole. The two ends of the first valve through hole are respectively set as a first end and a second end. The opening of the first end communicates with the compression hole, and the opening of the second end communicates with the accommodation cavity. The first retaining ring, the first sealing ball, the first valve spring, and the first support disk are sequentially arranged in the first valve through hole from the direction of the first end to the second end. The outer side walls of the first retaining ring and the first support disk are fixedly connected to the first valve through hole. The first retaining ring abuts against the first sealing ball to prevent the first sealing ball from separating from the opening of the first end out of the first valve through hole. The first sealing ball seals the opening of the first end. The two ends of the first valve spring are respectively connected to the first sealing ball and the first support disk. The center of the first support disk is provided with a first disk through hole, and a plurality of first ventilation through holes are arranged around its axis. The first valve spring is sleeved outside the first ejector rod. One end of the first ejector rod is connected to the first sealing ball, and the first ejector rod passes through the first disk through hole and is slidably connected to the first disk through hole;

[0024] The pushing assembly further comprises a fixed block, a gas delivery box, a sealing cover, a sealing slider and a cover opening spring arranged in the accommodating cavity, the fixed block and the gas delivery box are fixedly connected to the compression bottle, the gas delivery box is connected to the gas delivery opening, a gas delivery cavity is arranged in the gas delivery box, and a box opening penetrating to the gas delivery cavity is arranged on the outer surface of the gas delivery box, the sealing cover is arranged on the box opening and is sealed to the box opening, one end of the sealing cover is rotatably connected to the gas delivery box, the sealing slider is slidably arranged on the fixed block, the sealing slider abuts against the side of the sealing cover away from the gas delivery box, the cover opening spring is arranged between the gas delivery box and the sealing cover, the two ends of the cover opening spring are respectively connected to the gas delivery box and the sealing cover, and the other end of the first push rod faces the sealing slider;

[0025] When the movable housing moves downward at a speed greater than the downward pressing speed, the gas delivered into the accommodating chamber by the compression hole causes the first sealing ball to push the first push rod until the first push rod pushes the sealing slider, so that the sealing slider is separated from the sealing cover. At this time, the cover opening spring opens the sealing cover, so that the gas in the accommodating chamber passes through the box opening, the gas delivery chamber and the gas delivery opening in sequence and is then delivered into the telescopic bag.

[0026] Optionally, the compression bottle is provided with an air inlet that passes through the accommodating chamber, and the pushing assembly also includes a third one-way valve, the third one-way valve is arranged at the air inlet, the third one-way valve includes a second valve body, a second sealing ball, a second valve spring, a second supporting plate, a second baffle ring and a second push rod, the second valve body is provided with a second valve through hole, the two ends of the second valve through hole are respectively set as a third end and a fourth end, the opening of the third end is connected to the outside of the compression bottle, and the opening of the fourth end is connected to the accommodating chamber, the second baffle ring, the second sealing ball, the second valve spring and the second supporting plate are sequentially arranged in the second valve through hole from the third end to the fourth end, the outer side wall of the second baffle ring and the outer side wall of the second supporting plate are fixedly connected to the second valve through hole, and the The second retaining ring abuts against the second sealing ball to prevent the second sealing ball from detaching from the opening of the third end from the second valve through hole, the second sealing ball seals the opening of the third end, the two ends of the second valve spring are respectively connected to the second sealing ball and the second supporting disk, the center of the second supporting disk is provided with a second disk through hole, and a plurality of second ventilation through holes are provided around its axis, the second sealing ball is provided with a ball through hole corresponding to the second disk through hole, the second push rod passes through the ball through hole, the inner hole of the second valve spring and the second disk through hole in sequence, the second push rod is slidably connected to the second disk through hole, the second push rod is fixedly connected to the ball through hole, one end of the second push rod protrudes from the second sealing ball, and the other end faces the sealing cover away from the side of the gas delivery box;

[0027] The pushing assembly further includes a return spring, the two ends of which are respectively connected to the sealing slider and the fixed block, the return spring is used to apply a thrust to the sealing slider toward the sealing cover, and a guide portion is provided on a side of the sealing slider away from the sealing cover;

[0028] When the cover-opening spring opens the sealing cover, the third end is pressed to make the fourth end push the sealing cover. At this time, the sealing cover abuts against the guide portion to push open the sealing slider. Then, the sealing cover covers the box opening, and the return spring pushes the sealing slider to move toward the sealing cover, so that the sealing slider abuts against the side of the sealing cover away from the gas delivery box.

[0029] Compared with the prior art, the partial discharge tester according to the embodiment of the present invention has the following beneficial effects:

[0030] In the partial discharge tester of the present invention, the sensor is arranged on the detection boss of the instrument body, the movable shell is slidably arranged on the instrument body, the movable shell is provided with a clearance through hole corresponding to the detection boss, the clearance through hole is located above the sensor, and the two ends of the maintaining spring are respectively connected to the instrument body and the movable shell to apply an upward force to the movable shell so that the clearance through hole is maintained at a position above the sensor. When in normal use, the operator holds the instrument body, and extends the side of the instrument body provided with the detection boss toward the cabinet, so that the movable shell contacts the cabinet surface first, and the movable shell is pressed at a slower speed (the speed is not greater than the downward pressing speed) until its top surface is not higher than the sensor. The state of the top surface of the sensor is determined so that the sensor is attached to the surface of the cabinet for detection; in addition, multiple protection rods are arranged in the movable whole cavity of the movable shell and are slidably connected to the movable whole groove. The pushing component is connected to any protection rod. When the local tester falls, the movable shell hits other objects, causing them to be pressed toward the instrument body at a faster speed (the speed is greater than the downward pressure speed), and the pushing component pushes the protection rod to move to the top of the sensor to protect the sensor. In summary, when the partial discharge tester of the invention falls and may damage the sensor, the protection rod can be pushed out in time to protect the sensor to reduce the risk of sensor damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the partial discharge tester of the present invention.

[0032] Figure 2 for Figure 1 A partial enlarged view of part A in the middle.

[0033] Figure 3 It is a front view of the partial discharge tester of the present invention.

[0034] Figure 4This is the right view of the partial discharge tester of the present invention.

[0035] Figure 5 It is Figure 4 the sectional view taken along B-B in [the figure].

[0036] Figure 6 It is Figure 5 the enlarged partial view of part C in [the figure].

[0037] Figure 7 It is Figure 5 the enlarged partial view of part D in [the figure].

[0038] Figure 8 This is the schematic structural view of the partial discharge tester of the present invention, ignoring the instrument body.

[0039] Figure 9 This is the schematic structural view of the partial discharge tester of the present invention, ignoring the instrument body, the movable housing and the fixed housing.

[0040] Figure 10 It is Figure 9 the enlarged partial view of part E in [the figure].

[0041] Figure 11 This is the front view of the partial discharge tester of the present invention, ignoring the instrument body.

[0042] Figure 12 It is Figure 11 the sectional view taken along F-F in [the figure].

[0043] Figure 13 It is Figure 12 the sectional view taken along H-H in [the figure].

[0044] Figure 14 It is Figure 13 the enlarged partial view of part I in [the figure].

[0045] Figure 15 It is Figure 13 the enlarged partial view of part J in [the figure].

[0046] Figure 16 It is Figure 11 the sectional view taken along G-G in [the figure].

[0047] Reference numerals: 1, instrument body; 11, detection boss; 2, sensor; 3, protection component; 31, movable housing; 311, relief through-hole; 312, movable integral cavity; 3121, first movable cavity; 3122, second movable cavity; 3123, transition cavity; 313, movable integral groove; 3131, first movable groove; 3132, second movable groove; 3133, transition groove; 314, first protection plate; 315, second protection plate; 316, maintaining bump; 32, protection rod; 33, maintaining spring; 34, rod slider; 35, fixed housing; 351, maintaining groove; 36, sliding cavity; 37, sliding cavity opening; 4, pushing component; 41, compression bottle; 411, accommodating cavity; 412, gas delivery opening; 413, air inlet; 42, telescopic bladder; 43, push rod; 44, support tube; 45, compression housing; 451, compression hole; 452, compression inlet; 453, compression outlet; 46, compression plate; 47, first one-way valve; 48, second one-way valve; 481, first valve body; 4811, first valve through-hole; 48111, first end; 48112, second end; 482, first sealing ball; 483, first valve spring; 484, first support disk; 4841, first ventilation through-hole; 4842, first disk through-hole; 485, first retaining ring; 486, first ejector rod; 49, fixed block; 491, block groove; 4a, gas delivery box; 4a1, gas delivery cavity; 4a2, box opening; 4b, sealing cover; 4c, sealing slider; 4c1, guiding part; 4d, opening spring; 4e, third one-way valve; 4e1, second valve body; 4e11, second valve through-hole; 4e111, third end; 4e112, fourth end; 4e2, second sealing ball; 4e21, ball through-hole; 4e3, second valve spring; 4e4, second support disk; 4e41, second ventilation through-hole; 4e42, second disk through-hole; 4e5, second retaining ring; 4e6, second ejector rod; 4f, reset spring; 4g, rotating block; 4g1, first abutting part; 4g2, second abutting part; 4g3, rotating part; 4h, push post; 4i, limiting block; 5, anti-collision sleeve. Detailed implementation manners

[0048] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0050] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] As Figures 1 to 16 shown, a partial discharge tester of the present invention includes: an instrument body 1, a sensor 2, a protection component 3, and a pushing component 4. A detection boss 11 is provided on the top surface of the instrument body 1; the sensor 2 is arranged on the top surface of the detection boss 11; the protection component 3 includes a maintaining spring 33, a movable outer shell 31, and a plurality of protection rods 32. The movable outer shell 31 is slidably connected to the instrument body 1 in the up and down direction. A relief through hole 311 corresponding to the detection boss 11 is provided on the top surface of the movable outer shell 31. The relief through hole 311 is located above the sensor 2. An active adjustment cavity 312 and an active adjustment groove 313 are provided in the movable outer shell 31. The active adjustment groove 313 is located on one side of the active adjustment cavity 312 and communicates with the active adjustment cavity 312. The active adjustment groove 313 and the active adjustment cavity 312 communicate with the relief through hole 311. A plurality of the protection rods 32 are sequentially arranged in the active adjustment cavity 312. One end of the protection rod 32 is slidably connected to the active adjustment groove 313. Both ends of the maintaining spring 33 are respectively connected to the instrument body 1 and the movable outer shell 31. The maintaining spring 33 is used to apply a continuously upward force to the movable outer shell 31 so that the relief through hole 311 is continuously located above the sensor 2; the pushing component 4 is connected to any one of the protection rods 32, and the pushing component 4 is configured with a downward pressing speed; when the movable outer shell 31 moves downward at a speed not greater than the downward pressing speed until the movable outer shell 31 abuts against the instrument body 1, the top surface of the movable outer shell 31 is not higher than the top surface of the sensor 2; when the movable outer shell 31 moves downward at a speed greater than the downward pressing speed, the pushing component 4 pushes any one of the protection rods 32 so that any one of the protection rods 32 moves above the sensor 2.

[0052] In the above technical solution, during normal use, the operator holds the instrument body 1, aligns the side of the instrument body 1 with the detection boss 11 to extend out of the cabinet body, so that the movable outer shell 31 first contacts the surface of the cabinet body, and the movable outer shell 31 is pressed at a slower speed (this speed is not greater than the pressing-down speed) until its top surface is not higher than the top surface of the sensor 2, so that the sensor 2 is attached to the surface of the cabinet body for detection; in addition, a plurality of protective rods 32 are arranged in the movable cavity 312 of the movable outer shell 31 and are slidably connected to the movable slot 313, and the pushing assembly 4 is connected to any one of the protective rods 32. When the local tester drops, the movable outer shell 31 impacts other objects and is pressed in the direction of the instrument body 1 at a faster speed (this speed is greater than the pressing-down speed), and the pushing assembly 4 pushes the protective rod 32 to move above the sensor 2 to protect the sensor 2; in summary, when the partial discharge tester of the invention drops and may damage the sensor 2, the protective rod 32 can be pushed out in time to protect the sensor 2, so as to reduce the risk of damage to the sensor 2.

[0053] It should be noted that the pushing assembly 4 can include a controller, a speed sensor 2, and a pushing driver (which can be a motor or a piston cylinder). The controller is connected to the speed sensor 2 and the pushing driver. The pressing-down speed is set in the controller. The speed sensor 2 can be used to detect the absolute speed of the entire instrument body 1, or two speed sensors 2 can be respectively arranged on the movable outer shell 31 and the instrument body 1 to detect the relative speed. When the absolute speed is greater than the pressing-down speed, or the relative speed is greater than the pressing-down speed, the pushing driver pushes out the protective rod 32 to protect the sensor 2.

[0054] In addition, the movable slot 313 can be located on one side of the movable cavity 312 in the front-back direction.

[0055] In addition, a soft material can be provided on the outer side wall of the protective rod 32 to enhance the protection effect.

[0056] In addition, a rod slider 34 is provided at one end of the protective rod 32. The rod slider 34 is slidably connected to the movable slot 313. Adjacent two rod sliders 34 are connected, and adjacent protective rods 32 are sequentially connected through the rod sliders 34 and are arranged at intervals. When the protective rod 32 is pushed out, a plurality of protective rods 32 can be laid at intervals above the sensor 2 to provide more comprehensive protection for the sensor 2.

[0057] In addition, a receiving groove can be provided on the top surface of the detection boss 11. The sensor 2 is arranged in the receiving groove, and the top surface of the sensor 2 is flush with the top surface of the detection boss 11.

[0058] Furthermore, two movable whole grooves 313 are provided in the movable shell 31, and the two movable whole grooves 313 are located on both sides of the movable whole cavity 312 along the front-rear direction. The two ends of the protective rod 32 are respectively slidably connected to the two movable whole grooves 313 to increase the smoothness of the movement of the protective rod 32 and reduce the risk of the protective rod 32 being stuck in the movable whole cavity 312, resulting in the protective rod 32 being unable to move to the top of the sensor 2 in time. At this time, rod sliders 34 are provided at both ends of the protective rod 32.

[0059] Further, the movable housing 31 includes a first protective plate 314 and a second protective plate 315, the first protective plate 314 is located above the instrument body 1, the top of the second protective plate 315 is fixedly connected to the bottom surface of one end of the first protective plate 314, the second protective plate 315 is slidably connected to the instrument body 1 along the up-down direction, the make way through hole 311 is provided on the first protective plate 314, the make way through hole 311 passes through the first protective plate 314 along the up-down direction, the movable whole cavity 312 includes a first movable cavity 3121 and a second movable cavity 3122, the movable whole groove 313 includes a first movable groove 3131 and a second movable groove 3132, the first movable cavity 3121 and the first movable groove 3131 are provided in the first protective plate 314, the first movable cavity 3121 and the first movable groove 3131 are along the length direction of the first protective plate 314 The second active cavity 3122 and the second active groove 3132 are arranged in the second protective plate 315, and the second active cavity 3122 and the second active groove 3132 are extended along the length direction of the first protective plate 314. One end of the first active cavity 3121 is connected to one end of the second active cavity 3122, the first active cavity 3121 and the first active groove 3131 are connected, and the second active cavity 3122 and the second active groove 3132 are connected. A plurality of protective rods 32 are arranged in the second active cavity 3122 in sequence, and one end of the protective rod 32 is slidably connected to the second active groove 3132; wherein, the first protective plate 314 is used to protect the sensor 2, and the second protective plate 315 is used to be slidably connected and to accommodate the protective rod 32 under normal circumstances; in addition, the second protective plate 315 can be located on one side of the instrument body 1 along the left-right direction.

[0060] In addition, a transition cavity 3123 is provided between the first active cavity 3121 and the second active cavity 3122, the second active cavity 3122, the transition cavity 3123 and the first active cavity 3121 are connected in sequence, an angle of 10° to 80° is formed between the extension direction of the first active cavity 3121 and the extension direction of the transition cavity 3123, and an angle of 10° to 80° is formed between the extension direction of the second active cavity 3122 and the extension direction of the transition cavity 3123; a transition groove 3133 is provided between the first active groove 3131 and the second active groove 3132, The second movable groove 3132, the transition groove 3133 and the first movable groove 3131 are connected in sequence, and the extension direction of the first movable groove 3131 and the extension direction of the transition groove 3133 have an angle of 10° to 80°, and the extension direction of the second movable groove 3132 and the extension direction of the transition groove 3133 have an angle of 10° to 80°. The two adjacent rod sliders 34 are rotatably connected (similar to the connection structure between the chain plates in a chain) to ensure that the protective rod 32 can move smoothly between the first active cavity 3121 and the second active cavity 3122.

[0061] Furthermore, the movable housing 31 includes two second protective plates 315, which are respectively arranged on both sides of the first protective plate 314 along the left and right directions to ensure the stability of the sliding connection, and can enable the protective rod 32 to be pushed out of the protective rod 32 on both sides at the same time, so that the protective rod 32 can cover the make way through hole 311 more quickly to comprehensively protect the sensor 2.

[0062] Furthermore, the protective component 3 also includes a fixed shell 35, which is arranged on one side of the instrument body 1 along the left-right direction and is fixedly connected to the instrument body 1. A sliding cavity 36 is formed between the fixed shell 35 and the instrument body 1. The top of the sliding cavity 36 is provided with a sliding cavity opening 37 that penetrates upward to the outside. The movable shell 31 passes through the sliding cavity opening 37 and extends into the sliding cavity 36. The movable shell 31 is slidably connected to the sliding cavity 36 along the up and down directions; wherein, the fixed shell 35 can be provided with connecting plates on its two side surfaces relative to the front and back directions, and the two ends of the connecting plates are respectively connected to the sides of the fixed shell 35 and the instrument body 1 relative to the front and back directions, so as to connect the fixed shell 35 and the instrument body 1.

[0063] Further, a maintenance groove 351 is provided on the side of the fixed housing 35 relative to the side of the instrument body 1. The maintenance groove 351 communicates with the sliding cavity 36. A maintenance projection 316 is provided on the second protection plate 315. The maintenance projection 316 is located in the maintenance groove 351. The maintenance spring 33 is arranged in the maintenance groove 351. Two ends of the maintenance spring 33 are respectively connected to the maintenance projection 316 and the groove wall of the maintenance groove 351 to apply a continuously upward force to the movable housing 31. Among them, the maintenance spring 33 is vertically arranged to facilitate applying a continuously upward force to the movable housing 31. In addition, when two ends of the maintenance spring 33 are respectively connected to the maintenance projection 316 and the upper groove wall of the maintenance groove 351, the maintenance spring 33 is a tension spring. When two ends of the maintenance spring 33 are respectively connected to the maintenance projection 316 and the lower groove wall of the maintenance groove 351, the maintenance spring 33 is a compression spring.

[0064] Further, the pushing assembly 4 includes a compression bottle 41, a telescopic bladder 42, a push rod 43, and a support tube 44. The telescopic bladder 42, the push rod 43, and the support tube 44 are arranged in the movable integral cavity 312. The support tube 44 is vertically arranged on the bottom surface of the movable integral cavity 312 and sleeved outside the telescopic bladder 42. The top end of the telescopic bladder 42 is connected to the push rod 43. The push rod 43 is located below each protection rod 32. The compression bottle 41 is connected to the telescopic bladder 42. The compression bottle 41 is used to input gas into the telescopic bladder 42. When the compression bottle 41 inputs gas into the telescopic bladder 42, the telescopic bladder 42 elongates in the up and down direction, so that the push rod 43 moves upward, and further the push rod 43 pushes the protection rod 32 to move along the length direction of the movable integral cavity 312.

[0065] Among them, the support tube 44 is used to fix the telescopic bladder 42 at the bottom of the movable integral cavity 312 and guide the telescopic bladder 42 to prevent the elongation direction of the telescopic bladder 42 from deviating too much from the up and down direction, thereby affecting the pushing effect; in addition, the telescopic bladder 42 is an airbag component provided with folds. When gas is input into the telescopic bladder 42, the telescopic bladder 42 unfolds and then elongates along its axis. When the gas in the telescopic bladder 42 is evacuated, the telescopic bladder 42 folds out the folds and then elongates and shortens along its axis; in addition, the compression bottle 41 is provided with high-pressure gas to ensure that the gas can quickly fill the telescopic bladder 42; in addition, the pushing assembly 4 may further include a push column 4h vertically arranged in the movable integral cavity 312. The push column 4h is arranged between the telescopic bladder 42 and the push rod 43. The telescopic bladder 42 pushes the push rod 43 through the push column 4h to improve the reliability of the push; in addition, the push rod 43 can be horizontally arranged, and a pushing surface is arranged on the top surface of the push rod 43. The pushing surface matches the shape of the protective rod 32 or the shape of the rod slider 34, so that the push rod 43 and the protective rod 32 or the rod slider 34 have a larger contact area, thereby improving the smoothness of the push; in addition, the compression bottle 41 can be arranged on the side surface of the fixed housing 35 relative to the left and right directions.

[0066] Further, the pushing assembly 4 further includes a compression shell 45, a compression plate 46, a first one-way valve 47 and a second one-way valve 48. The top surface of the compression shell 45 is provided with a compression hole 451 matching the compression plate 46. The compression plate 46 is arranged in the compression hole 451. The outer surface of the compression shell 45 is provided with a compression inlet 452 and a compression outlet 453 communicating with the compression hole 451. The compression inlet 452 is provided with the first one-way valve 47. The setting direction of the one-way valve is from the compression inlet 452 to the compression hole 451. The compression outlet 453 is provided with the second one-way valve 48. The setting direction of the second one-way valve 48 is from the compression hole 451 to the compression outlet 453. The compression plate 46 is connected to the compression bottle 41 through the compression outlet 453. The compression shell 45 and the compression plate 46 are located below the movable housing 31. The top surface of the compression plate 46 is connected to the bottom surface of the movable housing 31; when the movable housing 31 moves downward, the compression plate 46 is moved downward, so as to convey the gas in the compression hole 451 into the compression bottle 41; when the movable housing 31 moves upward, the compression plate 46 is moved upward, so as to convey the external gas into the compression hole 451.

[0067] Among them, the above structure enables the movable housing 31 to inflate the compression bottle 41 when moving up and down reciprocally, so as to increase the air pressure in the compression bottle 41, thereby increasing the speed when pushing the protective rod 32.

[0068] In addition, the structure of the first one-way valve 47 can be similar to that of the second one-way valve 48.

[0069] Further, an accommodation chamber 411 is provided inside the compression bottle 41, and an air delivery opening 412 penetrating through to the accommodation chamber 411 is provided on the outer surface of the compression bottle 41. The air delivery opening 412 is connected to the telescopic bladder 42. The second one-way valve 48 includes a first valve body 481, a first sealing ball 482, a first valve spring 483, a first support disc 484, a first retaining ring 485, and a first ejector rod 486. The first valve body 481 is provided with a first valve through-hole 4811. The two ends of the first valve through-hole 4811 are respectively set as a first end 48111 and a second end 48112. The opening of the first end 48111 communicates with the compression hole 451, and the opening of the second end 48112 communicates with the accommodation chamber 411. The first retaining ring 485, the first sealing ball 482, the first valve spring 483, and the first support disc 484 are sequentially arranged in the first valve through-hole 4811 from the direction of the first end 48111 to the second end 48112. The outer side walls of the first retaining ring 485 and the first support disc 484 are fixedly connected to the first valve through-hole 4811. The first retaining ring 485 abuts against the first sealing ball 482 to prevent the first sealing ball 482 from detaching from the opening of the first end 48111 of the first valve through-hole 4811. The first sealing ball 482 seals the opening of the first end 48111. The two ends of the first valve spring 483 are respectively connected to the first sealing ball 482 and the first support disc 484. A first disc through-hole 4842 is provided at the center of the first support disc 484, and a plurality of first ventilation through-holes 4841 are provided around its axis. The first valve spring 483 is sleeved outside the first ejector rod 486. One end of the first ejector rod 486 is connected to the first sealing ball 482. The first ejector rod 486 passes through the first disc through-hole 4842 and is slidably connected to the first disc through-hole 4842. The pushing assembly 4 further includes a fixed block 49, an air delivery box 4a, a sealing cover 4b, a sealing slider 4c, and an opening cover spring 4d provided in the accommodation chamber 411. The fixed block 49 and the air delivery box 4a are fixedly connected to the compression bottle 41. The air delivery box 4a is connected to the air delivery opening 412. An air delivery chamber 4a1 is provided inside the air delivery box 4a. An opening 4a2 penetrating through to the air delivery chamber 4a1 is provided on the outer surface of the air delivery box 4a. The sealing cover 4b covers the opening 4a2 and is sealingly connected to the opening 4a2. One end of the sealing cover 4b is rotatably connected to the air delivery box 4a. The sealing slider 4c is slidably arranged on the fixed block 49. The sealing slider 4c abuts against the side surface of the sealing cover 4b away from the air delivery box 4a. The opening cover spring 4d is provided between the air delivery box 4a and the sealing cover 4b. The two ends of the opening cover spring 4d are respectively connected to the air delivery box 4a and the sealing cover 4b. The other end of the first ejector rod 486 faces the sealing slider 4c;When the movable outer shell 31 moves downward at a speed greater than the downward pressing speed, the gas delivered by the compression hole 451 into the accommodation cavity 411 causes the first sealing ball 482 to push the first ejector rod 486 until the first ejector rod 486 pushes the sealing slider 4c, causing the sealing slider 4c to disengage from the sealing cover 4b. At this time, the opening spring 4d expands the sealing cover 4b, enabling the gas in the accommodation cavity 411 to pass through the box opening 4a2, the air delivery cavity 4a1, and the air delivery opening 412 in sequence and then be delivered into the expansion bag 42.;

[0070] In the above technical solution, when the partial discharge tester is in normal use and the movable outer shell 31 moves downward at a speed not greater than the downward pressing speed, the flow rate of the gas delivered by the compression hole 451 into the accommodation cavity 411 is small and cannot cause the first sealing ball 482 to push the first ejector rod 486 far enough. The first ejector rod 486 cannot push the sealing slider 4c and only delivers gas into the accommodation cavity 411, increasing the air pressure in the accommodation cavity 411. When the partial discharge tester drops and the movable outer shell 31 moves downward at a speed greater than the downward pressing speed, the flow rate of the gas delivered by the compression hole 451 into the accommodation cavity 411 is large, which can cause the first sealing ball 482 to push the first ejector rod 486 far enough. The first ejector rod 486 pushes the sealing slider 4c to open the sealing cover 4b, and then the gas in the accommodation cavity 411 passes through the box opening 4a2, the air delivery cavity 4a1, and the air delivery opening 412 in sequence and is delivered into the expansion bag 42. The expansion bag 42 elongates in the up-and-down direction, causing the push rod 43 to move upward, and then the push rod 43 pushes the protection rod 32 to move along the length direction of the movable cavity 312. The protection rod 32 moves above the sensor 2 to protect the sensor 2.

[0071] Among them, factors such as the specification of the first valve spring 483, the frictional force of the sliding connection of the movable outer shell 31, the air pressure in the compression bottle 41, and the air pressure in the compression shell 45 can be configured and adjusted to change the magnitude of the downward pressing speed and the resistance received when pressing down the movable outer shell 31.

[0072] Further, the compression bottle 41 is provided with an air inlet 413 penetrating into the accommodation cavity 411. The pushing assembly 4 further includes a third one-way valve 4e. The third one-way valve 4e is disposed at the air inlet 413. The third one-way valve 4e includes a second valve body 4e1, a second sealing ball 4e2, a second valve spring 4e3, a second support plate 4e4, a second retaining ring 4e5 and a second ejector rod 4e6. The second valve body 4e1 is provided with a second valve through hole 4e11. The two ends of the second valve through hole 4e11 are respectively set as a third end 4e111 and a fourth end 4e112. The opening of the third end 4e111 communicates with the outside of the compression bottle 41, and the opening of the fourth end 4e112 communicates with the accommodation cavity 411. The second retaining ring 4e5, the second sealing ball 4e2, the second valve spring 4e3 and the second support plate 4e4 are sequentially disposed in the second valve through hole 4e11 from the direction of the third end 4e111 to the fourth end 4e112. The outer side walls of the second retaining ring 4e5 and the second support plate 4e4 are fixedly connected to the second valve through hole 4e11. The second retaining ring 4e5 abuts against the second sealing ball 4e2 to prevent the second sealing ball 4e2 from detaching from the opening of the third end 4e111 of the second valve through hole 4e11. The second sealing ball 4e2 seals the opening of the third end 4e111. The two ends of the second valve spring 4e3 are respectively connected to the second sealing ball 4e2 and the second support plate 4e4. The center of the second support plate 4e4 is provided with a second plate through hole 4e42, and a plurality of second ventilation through holes 4e41 are arranged around its axis. The second sealing ball 4e2 is provided with a ball through hole 4e21 corresponding to the second plate through hole 4e42. The second ejector rod 4e6 sequentially passes through the ball through hole 4e21, the inner hole of the second valve spring 4e3 and the second plate through hole 4e42. The second ejector rod 4e6 is slidably connected to the second plate through hole 4e42. The second ejector rod 4e6 is fixedly connected to the ball through hole 4e21. One end of the second ejector rod 4e6 protrudes from the second sealing ball 4e2, and the other end faces the side of the sealing cover 4b away from the air delivery box 4a. The pushing assembly 4 further includes a return spring 4f. The two ends of the return spring 4f are respectively connected to the sealing slider 4c and the fixed block 49. The return spring 4f is used to apply a thrust to the sealing slider 4c towards the sealing cover 4b. A guiding portion 4c1 is provided on the side of the sealing slider 4c away from the sealing cover 4b.When the cover opening spring 4d opens the sealing cover 4b, it presses the third end 4e111, so that the fourth end 4e112 pushes the sealing cover 4b. At this time, the sealing cover 4b abuts against the guide portion 4c1 to push the sealing slider 4c. Then, the sealing cover 4b covers the box opening 4a2, and the return spring 4f pushes the sealing slider 4c to move toward the sealing cover 4b, so that the sealing slider 4c abuts against the side of the sealing cover 4b away from the gas delivery box 4a.

[0073] The above technical solution is used to reset after triggering the protection action. The protection action refers to that after the compression bottle 41 inflates the telescopic bag 42, the protective rod 32 moves to the top of the sensor 2 to protect the sensor 2; after the protection action is triggered, the first valve spring 483 resets the first sealing ball 482 to a position abutting against the first gear ring, and the first push rod 486 is pulled back by the first sealing ball 482 to reset, and the reset spring 4f resets the sealing slider 4c to the position where the sealing slider 4c abuts against the sealing cover 4b. At this time, the specific reset operation process is: the operator presses the third end 4e111 to make the fourth end 4e112 push the sealing Sealing cover 4b, at this time, the sealing cover 4b abuts against the guide part 4c1, and the guide part 4c1 can be rounded or chamfered. The sealing cover 4b pushes the sealing slider 4c to move the sealing slider 4c along its sliding setting direction, and then the fourth end 4e112 continues to push the sealing cover 4b until the sealing cover 4b covers the box opening 4a2, so that the sealing cover 4b seals the box opening 4a2. At this time, the reset spring 4f pushes the sealing slider 4c to move toward the sealing cover 4b, so that the sealing slider 4c abuts against the side of the sealing cover 4b away from the gas box 4a to complete the reset.

[0074] Preferably, the air inlet 413 can be arranged on the side of the compression bottle 41 relative to the left and right directions, the third one-way valve 4e is arranged on the air inlet 413 along the left and right directions, the gas delivery box 4a is located on one side of the third one-way valve 4e along the left and right directions, the box opening 4a2 is relative to the second valve through hole 4e11, the top end of the sealing cover 4b is rotatably connected to the position of the gas delivery box 4a above the box opening 4a2, the fixed block 49 is provided with a block groove 491 on the side relative to the first push rod 486, and the block groove 491 penetrates to the top surface of the fixed block 49, the pushing assembly 4 can also include a rotating block 4g, the rotating block 4g is rotatably arranged in the block groove 491, the rotating block 4g includes a first abutment portion 4g1, a rotating portion 4g3 and a second abutment portion 4g2 connected in sequence, and the first abutment portion 4g1 extends vertically upward The second abutting portion 4g2 is arranged to extend away from the first push rod 486, the rotating portion 4g3 is rotatably connected to the groove wall of the block groove 491, the groove wall of the block groove 491 is provided with a sealing slide groove extending in the up-down direction, the sealing slider 4c is slidably connected to the sealing slide groove in the up-down direction, the return spring 4f is arranged in the block groove 491, the side surface of the first abutting portion 4g1 is relative to one end of the first push rod 486, the bottom surface of the second abutting portion 4g2 abuts against the sealing slider 4c, and one side surface of the sealing slider 4c abuts against the bottom of one side surface of the sealing cover 4b; when the first push rod 486 moves along its axial direction to push the first abutting portion 4g1, the second abutting portion 4g2 rotates around the rotating portion 4g3 to press down the sealing slider 4c, so that the sealing slider 4c moves downward to separate from the sealing cover 4b, at this time, the sealing spring opens the sealing cover 4b.

[0075] In addition, the sealing cover 4b and the gas delivery box 4a are rotatably connected via an ear seat and an ear plate. An inclined limit block 4i may be provided at the ear seat or the ear plate to limit the rotation angle of the sealing cover 4b to prevent a situation where it is difficult or even impossible to reset. Specifically, the ear seat is provided on the gas delivery box 4a, the ear plate is provided on the sealing cover 4b, the limit block 4i is inclinedly provided on the ear seat, the limit block 4i is provided obliquely downward, and the limit block 4i abuts against the sealing cover 4b to limit the sealing cover 4b from continuing to rotate to a larger angle.

[0076] In addition, the protection component 3 also includes a plurality of anti-collision covers 5, which can be respectively arranged on both sides of the bottom of the instrument body 1 and both sides of the top of the movable shell 31 to reduce damage to the instrument body 1 caused by collision.

[0077] Furthermore, fixed setting and fixed connection refer to that the relative position relationship of two components is fixed, including but not limited to fixing by a connecting piece, fixing by welding, fixing by an adhesive, fixing by one-piece molding, and fixing by a snap connection.

[0078] Further, "sliding connection" and "sliding arrangement" mean that between two connected components, one component can slide on the other along a fixed track, including but not limited to being connected by sliding a slider into a chute, or being connected by inserting a slide bar into a hole that matches the size profile of the slide bar.

[0079] Further, "rotational connection" and "rotational arrangement" mean that two connected components can rotate relative to each other, including but not limited to being connected by a bearing or by a clearance fit.

[0080] Further, the connecting components include but are not limited to fasteners, straps, binding ropes, pneumatic connection elements, hydraulic connection elements, flange plates, Velcro, and buttons.

[0081] In summary, the embodiments of the present invention provide a partial discharge tester, and its technical effects are as follows:

[0082] In the partial discharge tester of the present invention, the sensor 2 is disposed on the detection boss 11 of the instrument body 1. The movable housing 31 is slidably disposed on the instrument body 1. The movable housing 31 is provided with a relief through-hole 311 corresponding to the detection boss 11. The relief through-hole 311 is located above the sensor 2. The two ends of the biasing spring 33 are respectively connected to the instrument body 1 and the movable housing 31 to apply an upward force to the movable housing 31, so that the relief through-hole 311 is maintained at a position above the sensor 2. When in normal use, the operator holds the instrument body 1 and extends the side of the detection boss 11 of the instrument body 1 towards the cabinet body, so that the movable housing 31 first contacts the surface of the cabinet body. The movable housing 31 is pressed at a slower speed (this speed is not greater than the pressing-down speed) until its top surface is not higher than the top surface of the sensor 2, so that the sensor 2 is attached to the surface of the cabinet body for detection. In addition, a plurality of protective rods 32 are disposed in the movable cavity 312 of the movable housing 31 and are slidably connected to the movable slot 313. The pushing assembly 4 is connected to any one of the protective rods 32. When the partial discharge tester drops, the movable housing 31 impacts other objects and is pressed towards the direction of the instrument body 1 at a faster speed (this speed is greater than the pressing-down speed). The pushing assembly 4 pushes the protective rod 32 to move above the sensor 2 to protect the sensor 2. In summary, when the partial discharge tester drops and may damage the sensor 2, the protective rod 32 can be pushed out in time to protect the sensor 2, so as to reduce the risk of damage to the sensor 2.

[0083] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A partial discharge tester, characterized in that, include: An instrument body, wherein a detection boss is provided on the top surface of the instrument body; A sensor, wherein the sensor is disposed on the top surface of the detection boss; A protection component, the protection component includes a maintenance spring, a movable shell and a plurality of protection rods, the movable shell is slidably connected to the instrument body in the up-down direction, the top surface of the movable shell is provided with a clearance through hole corresponding to the detection boss, the clearance through hole is located above the sensor, a movable whole cavity and a movable whole groove are provided in the movable shell, the movable whole groove is located on one side of the movable whole cavity and is connected to the movable whole cavity, the movable whole groove and the movable whole cavity are connected to the clearance through hole, a plurality of the protection rods are sequentially arranged in the movable whole cavity, one end of the protection rod is slidably connected to the movable whole groove, the two ends of the maintenance spring are respectively connected to the instrument body and the movable shell, the maintenance spring is used to apply a continuous upward force to the movable shell so that the clearance through hole is continuously located above the sensor; A pushing component, the pushing component is connected to any of the protection rods, and the pushing component is configured with a downward pressing speed; When the movable housing moves downward at a speed not greater than the downward pressing speed until the movable housing abuts against the instrument body, the top surface of the movable housing is not higher than the top surface of the sensor; When the movable housing moves downward at a speed greater than the downward pressing speed, the pushing component pushes any of the protection rods to move any of the protection rods to above the sensor.

2. The partial discharge tester according to claim 1, wherein A rod slider is provided at one end of the protection rod, and the rod slider is slidably connected to the movable whole groove, two adjacent rod sliders are connected, and adjacent protection rods are connected in sequence through the rod sliders and are arranged at intervals.

3. The partial discharge tester according to claim 2, characterized in that, The movable housing includes a first protective plate and a second protective plate, the first protective plate is located above the instrument body, the top of the second protective plate is fixedly connected to the bottom surface of one end of the first protective plate, the second protective plate is slidably connected to the instrument body along the up-down direction, the make way through hole is provided in the first protective plate, the make way through hole passes through the first protective plate along the up-down direction, the movable whole cavity includes a first movable cavity and a second movable cavity, the movable whole groove includes a first movable groove and a second movable groove, the first movable cavity and the first movable groove are provided in the first protective plate, the first movable cavity and the first movable groove are extended along the length direction of the first protective plate, the second movable cavity and the second movable groove are provided in the second protective plate, the second movable cavity and the second movable groove are extended along the length direction of the first protective plate, one end of the first movable cavity is connected to one end of the second movable cavity, the first movable cavity and the first movable groove are connected, the second movable cavity and the second movable groove are connected, a plurality of the protective rods are sequentially provided in the second movable cavity, and one end of the protective rods is slidably connected to the second movable groove.

4. The partial discharge tester according to claim 3, characterized in that, A transition cavity is provided between the first movable cavity and the second movable cavity. The second movable cavity, the transition cavity, and the first movable cavity are communicated in sequence. An angle between the extending direction of the first movable cavity and the extending direction of the transition cavity is between 10° and 80°. An angle between the extending direction of the second movable cavity and the extending direction of the transition cavity is between 10° and 80°. A transition groove is provided between the first movable groove and the second movable groove. The second movable groove, the transition groove, and the first movable groove are communicated in sequence. An angle between the extending direction of the first movable groove and the extending direction of the transition groove is between 10° and 80°. An angle between the extending direction of the second movable groove and the extending direction of the transition groove is between 10° and 80°. Adjacent two of the rod sliders are rotatably connected to each other.

5. The partial discharge tester according to claim 3, characterized in that, The protection component further includes a fixed outer shell, which is provided on one side of the instrument body and fixedly connected to the instrument body. A sliding cavity is formed between the fixed outer shell and the instrument body. The top of the sliding cavity is provided with a sliding cavity opening that penetrates upward to the outside. The movable outer shell passes through the sliding cavity opening and extends into the sliding cavity. The movable outer shell is slidably connected to the sliding cavity in the up and down direction.

6. The partial discharge tester according to claim 5, characterized in that, A maintaining groove is provided on the side surface of the fixed outer shell relative to the instrument body. The maintaining groove communicates with the sliding cavity. The second protection plate is provided with a maintaining convex block, and the maintaining convex block is located in the maintaining groove. The maintaining spring is provided in the maintaining groove. Two ends of the maintaining spring are respectively connected to the maintaining convex block and the groove wall of the maintaining groove to apply a continuously upward force to the movable outer shell.

7. The partial discharge tester according to claim 1, characterized in that, The pushing component includes a compression bottle, a telescopic bladder, a push rod, and a support tube. The telescopic bladder, the push rod, and the support tube are provided in the movable cavity. The support tube is vertically provided on the bottom surface of the movable cavity and sleeved outside the telescopic bladder. The top end of the telescopic bladder is connected to the push rod. The push rod is located below each of the protection rods. The compression bottle is connected to the telescopic bladder, and the compression bottle is used to input gas into the telescopic bladder. When the compression bottle inputs gas into the telescopic bladder, the telescopic bladder elongates in the up and down direction, so that the push rod moves upward, and further the push rod pushes the protection rod to move along the length direction of the movable cavity.

8. The partial discharge tester according to claim 7, characterized in that, The pushing component further includes a compression shell, a compression plate, a first one-way valve, and a second one-way valve. The top surface of the compression shell is provided with a compression hole that matches the compression plate. The compression plate is provided in the compression hole. The outer surface of the compression shell is provided with a compression inlet and a compression outlet that communicate with the compression hole. The compression inlet is provided with the first one-way valve, and the setting direction of the one-way valve is from the compression inlet to the compression hole. The compression outlet is provided with the second one-way valve, and the setting direction of the second one-way valve is from the compression hole to the compression outlet. The compression plate is connected to the compression bottle through the compression outlet. The compression shell and the compression plate are located below the movable outer shell. The top surface of the compression plate is connected to the bottom surface of the movable outer shell. When the movable housing moves downward, the compression plate moves downward, thereby delivering the gas in the compression hole to the compression bottle; When the movable housing moves upward, the compression plate moves upward, thereby delivering external gas into the compression hole.

9. The partial discharge tester according to claim 8, characterized in that: The compression bottle is provided with a receiving cavity inside, and the outer surface of the compression bottle is provided with a gas delivery opening penetrating to the receiving cavity, and the gas delivery opening is connected to the telescopic bag; The second one-way valve comprises a first valve body, a first sealing ball, a first valve spring, a first supporting disk, a first retaining ring and a first push rod. The first valve body is provided with a first valve through hole. The two ends of the first valve through hole are respectively set as a first end and a second end. The opening of the first end is communicated with the compression hole, and the opening of the second end is communicated with the accommodating cavity. The first retaining ring, the first sealing ball, the first valve spring and the first supporting disk are sequentially arranged in the first valve through hole from the first end to the second end. The outer wall of the first retaining ring and the outer wall of the first supporting disk are fixedly connected to the first valve through hole. The first retaining ring abuts against the first sealing ball to prevent the first sealing ball from being separated from the first valve through hole from the opening of the first end. The first sealing ball seals the opening of the first end. The two ends of the first valve spring are respectively connected to the first sealing ball and the first supporting disk. The center of the first supporting disk is provided with a first disk through hole, and a plurality of first ventilation through holes are provided around the axis thereof. The first valve spring is sleeved on the outer side of the first push rod. One end of the first push rod is connected to the first sealing ball. The first push rod passes through the first disk through hole and is slidably connected to the first disk through hole. The pushing assembly further comprises a fixed block, a gas delivery box, a sealing cover, a sealing slider and a cover opening spring arranged in the accommodating cavity, the fixed block and the gas delivery box are fixedly connected to the compression bottle, the gas delivery box is connected to the gas delivery opening, a gas delivery cavity is arranged in the gas delivery box, and a box opening penetrating to the gas delivery cavity is arranged on the outer surface of the gas delivery box, the sealing cover is arranged on the box opening and is sealed to the box opening, one end of the sealing cover is rotatably connected to the gas delivery box, the sealing slider is slidably arranged on the fixed block, the sealing slider abuts against the side of the sealing cover away from the gas delivery box, the cover opening spring is arranged between the gas delivery box and the sealing cover, the two ends of the cover opening spring are respectively connected to the gas delivery box and the sealing cover, and the other end of the first push rod faces the sealing slider; When the movable housing moves downward at a speed greater than the downward pressing speed, the gas delivered into the accommodating chamber by the compression hole causes the first sealing ball to push the first push rod until the first push rod pushes the sealing slider, so that the sealing slider is separated from the sealing cover. At this time, the cover opening spring opens the sealing cover, so that the gas in the accommodating chamber passes through the box opening, the gas delivery chamber and the gas delivery opening in sequence and is then delivered into the telescopic bag.

10. The partial discharge tester according to claim 9, characterized in that: The compression bottle is provided with an air inlet that penetrates the accommodating chamber, the pushing assembly also includes a third one-way valve, the third one-way valve is provided at the air inlet, the third one-way valve includes a second valve body, a second sealing ball, a second valve spring, a second supporting disk, a second baffle ring and a second push rod, the second valve body is provided with a second valve through hole, the two ends of the second valve through hole are respectively set as the third end and the fourth end, the opening of the third end is communicated with the outside of the compression bottle, and the opening of the fourth end is communicated with the accommodating chamber, the second baffle ring, the second sealing ball, the second valve spring and the second supporting disk are sequentially arranged in the second valve through hole from the third end to the fourth end, the outer side wall of the second baffle ring and the outer side wall of the second supporting disk are fixedly connected to the second valve through hole, and the first The second retaining ring abuts against the second sealing ball to prevent the second sealing ball from detaching from the opening of the third end from the second valve through hole, the second sealing ball seals the opening of the third end, the two ends of the second valve spring are respectively connected to the second sealing ball and the second supporting disk, the center of the second supporting disk is provided with a second disk through hole, and a plurality of second ventilation through holes are provided around its axis, the second sealing ball is provided with a ball through hole corresponding to the second disk through hole, the second push rod passes through the ball through hole, the inner hole of the second valve spring and the second disk through hole in sequence, the second push rod is slidably connected to the second disk through hole, the second push rod is fixedly connected to the ball through hole, one end of the second push rod protrudes from the second sealing ball, and the other end faces the sealing cover away from the side of the gas delivery box; The pushing assembly further includes a return spring, the two ends of which are respectively connected to the sealing slider and the fixed block, the return spring is used to apply a thrust to the sealing slider toward the sealing cover, and a guide portion is provided on a side of the sealing slider away from the sealing cover; When the cover-opening spring opens the sealing cover, the third end is pressed to make the fourth end push the sealing cover. At this time, the sealing cover abuts against the guide portion to push open the sealing slider. Then, the sealing cover covers the box opening, and the return spring pushes the sealing slider to move toward the sealing cover, so that the sealing slider abuts against the side of the sealing cover away from the gas delivery box.

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