Withstand voltage tester for power electronic equipment

Abstract

The utility model provides a withstand voltage tester for power electronic equipment, and belongs to the technical field of electrical performance testing devices. The power electronic equipment withstand voltage tester comprises a portable box and a withstand voltage tester body, the portable box comprises a box body and a box cover, the top surface of the withstand voltage tester body is provided with an interface, the side surface of the box body is provided with a positioning block, the positioning block is provided with a through hole for a cable to pass through, the center line of the through hole is parallel to the side surface of the box body, and the positioning block is provided with an adjusting screw in a threaded manner. One end of the adjusting screw rod is located outside the through hole, and the other end is located inside the through hole and is rotatably connected with a pressing plate which is provided with a pressing surface close to and pressing the cable when the adjusting screw rod rotates forwards. According to the utility model, the cable can be fixed, one end of the cable connected with the tester body is not loosened when the cable is subjected to external force in the testing process, and normal use of equipment is ensured. The portable box can be carried by hands or obliquely carried, so that the portable box is more convenient to carry. The box body is good in anti-skid effect, and the stability of equipment can be guaranteed when the equipment works on a slope.

Description

Technical Field

[0001] The utility model relates to a withstand voltage tester for power electronic equipment, belonging to the technical field of electrical performance testing devices. Background Art

[0002] With the rapid development of power electronics technology, various types of power electronic equipment (such as frequency converters, inverters, power supplies, etc.) are widely used in industry, telecommunications, automobiles and other fields. As a result, higher requirements are placed on their safety and reliability. In order to ensure the safety of power electronic equipment under various working conditions, electrical safety tests are required, among which low voltage withstand voltage test is an important test item.

[0003] Chinese utility model patent publication number CN218524766U discloses a spot inspection device for a withstand voltage tester. The device comprises a housing, a lid, and a tester body. The tester body is housed within the housing, and the lid is pivotally connected to the housing. The housing is equipped with a handle, forming a portable case. A fan is located at the bottom of the housing to cool the tester body during use. The device also includes a vibration-damping rotating member and a bracket. The bracket supports the tester body and pivotally connects it to the vibration-damping rotating member, enhancing heat dissipation during use.

[0004] The above-mentioned inspection device is handheld and has certain portability characteristics, but it needs to occupy the operator's hands, which brings inconvenience to the operator when carrying a lot of equipment. Secondly, when the inspection device is operating on a slope, the anti-slip ability of the box is poor, and the equipment cannot remain in a stable state. In addition, during testing, one end of the test line needs to be plugged into the interface of the tester body, and the other end is connected to the device to be tested. During the testing process, once the cable is subjected to external force, it will cause the interface to loosen, affecting the normal use of the equipment. Not only that, the power cord is the same. When subjected to external force, the end connected to the tester body will also become loose, affecting the normal use of the equipment. Utility Model Content

[0005] The purpose of the utility model is to provide a power electronic equipment withstand voltage tester to solve the problem that when the existing equipment is tested, the cable connected to the tester body will become loose due to external force, thereby affecting the normal use of the equipment.

[0006] To achieve the above-mentioned purpose, the power electronic equipment withstand voltage tester in the present invention adopts the following technical solutions:

[0007] A power electronic device voltage tester includes a portable case and a voltage tester body arranged in the portable case, the portable case includes a case body and a case cover installed on the top of the case body, an interface for connecting cables is provided on the top surface of the voltage tester body, a positioning block for positioning the cable is provided on the side of the case body, a through-hole for the cable to pass through is provided on the positioning block, the center line of the through-hole is parallel to the side of the case body where the positioning block is located, an adjusting screw is threadedly assembled on the positioning block, one end of the adjusting screw is located outside the through-hole, and the other end is located inside the through-hole and is rotatably connected to a pressure plate, the pressure plate having a pressing surface for approaching and pressing the cable when the adjusting screw rotates forward and moving away from the cable when the adjusting screw rotates reversely.

[0008] The beneficial effect of the above technical solution is that: the utility model belongs to an improved invention, and the improvement is that a positioning block for positioning the cable is added to the side of the box, and a perforation for the cable to pass through is provided on the positioning block, and the center line of the perforation is parallel to the side of the box where the positioning block is located, so that the cable can pass through the perforation first and then be connected to the interface on the top surface of the withstand voltage tester body, or the cable can be connected to the interface on the top surface of the withstand voltage tester body first and then pass through the perforation. The positioning block is threaded with an adjusting screw, one end of the adjusting screw is located outside the perforation, and the other end is located inside the perforation and is rotatably connected to a pressure plate, the pressure plate has a pressing surface for approaching and pressing the cable when the adjusting screw rotates forward and away from the cable when the adjusting screw is reversed, so that after the cable passes through the perforation, the pressing surface of the pressure plate can contact and press the cable by rotating the adjusting screw forward, thereby fixing the cable, and the pressure plate is rotatably connected to the adjusting screw, so that the adjusting screw will not affect the pressure plate when it rotates. Once the cable is secured by the pressure plate, even if external forces are applied to the cable during subsequent testing, the end connected to the tester will not loosen, ensuring normal operation of the device. After the test is completed, the pressure plate can be moved away from the cable by reversing the adjustment screw, making it easier to remove the cable.

[0009] Furthermore, the interface on the voltage withstand tester body includes a test interface for connecting the test line and a power interface for connecting the power line. The positioning block is in the shape of a long strip, and at least two perforations are arranged at intervals along the length direction of the positioning block. Each perforation is equipped with a corresponding adjusting screw and pressure plate.

[0010] Furthermore, the axes of the adjusting screws are parallel, and the ends of the adjusting screws located outside the corresponding through-holes are all on the same side of the positioning block.

[0011] Furthermore, the center line of each through hole extends vertically.

[0012] Furthermore, fixing plates that fit the side surfaces of the box body are respectively provided on the two opposite surfaces of the positioning block, and the positioning block is fixed to the box body by fixing bolts that penetrate the fixing plates and are connected to the side surfaces of the box body.

[0013] Furthermore, a crossbody strap is connected to the box body.

[0014] Furthermore, the cross-body shoulder strap includes a first shoulder strap and a second shoulder strap respectively connected to two opposite side surfaces of the box body, the end of one of the first shoulder strap and the second shoulder strap is provided with a connecting buckle, and the end of the other is provided with a plurality of limiting holes arranged at intervals along the extension direction of the shoulder strap, the connecting buckle includes a connecting frame and a limiting pin hinged on the connecting frame and used to pass through the corresponding limiting holes, the connecting frame is in the shape of a "sun", the connecting frame includes an outer frame body and a fixing rod fixed in the outer frame body, the limiting pin is hinged on one side edge of the outer frame body and can cross the fixing rod and overlap on the other opposite side edge of the outer frame body.

[0015] Furthermore, a handle is provided on the box body.

[0016] Furthermore, a plurality of legs are provided at the bottom of the box body, and an anti-slip protrusion is provided on the bottom surface of each leg.

[0017] Furthermore, the anti-slip protrusion is hemispherical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of an embodiment of a power electronic equipment withstand voltage tester of the utility model;

[0019] Figure 2 This is an exploded view of the positioning block, the adjusting screw and the pressing plate in the embodiment of the power electronic equipment withstand voltage tester of the present utility model;

[0020] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0021] Figure 4 This is a structural diagram of an embodiment of the power electronic equipment withstand voltage tester of the present utility model (the case cover and the crossbody shoulder strap are not shown).

[0022] In the figure: 1. Box body; 11. Pillar; 12. Anti-slip block; 13. Anti-slip protrusion; 14. Handle; 15. Connector; 2. Box cover; 21. Observation window; 3. Voltage tester body; 31. External control interface; 32. High voltage interface; 33. Grounding interface; 34. Power interface; 4. Positioning block; 41. Block; 411. Perforation; 42. Fixing plate; 5. First shoulder strap; 51. Connecting buckle; 511. Outer frame; 512. Fixing rod; 513. Limiting pin; 6. Second shoulder strap; 61. Limiting hole; 7. Fixing bolt; 8. Adjusting screw; 9. Rotating shaft; 10. Pressure plate. DETAILED DESCRIPTION

[0023] In response to the technical problems existing in the prior art, the basic idea of ​​the present invention is to set a positioning block on the side of the box, set a perforation on the positioning block and install an adjustable pressure plate. After the cable passes through the perforation, the pressure plate is used to tighten the cable to fix the cable, thereby preventing the cable from being subjected to external force during the test and causing the end connected to the voltage tester body to loosen, thereby ensuring that the test is not affected.

[0024] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0025] Embodiment 1 of the power electronic equipment withstand voltage tester in the present utility model:

[0026] like Figure 1 and Figure 4 As shown, the power electronic device withstand voltage tester includes a portable case and a withstand voltage tester body 3 disposed within the portable case. The portable case includes a case body 1 and a lid 2 mounted on the top of the case body 1. Specifically, the lid 2 is hinged to the rear side of the top of the case body 1 and can be opened by flipping backward and closed by flipping forward. After closing, the lid 2 can be locked to the case body 1. The top surface of the withstand voltage tester body 3 is provided with a display screen, various buttons, adjustment knobs, and interfaces for connecting cables. The lid 2 is provided with an acrylic observation window 21 for convenient observation of the withstand voltage tester body 3.

[0027] The withstand voltage tester body 3 is equipped with a high voltage rod, a ground wire and a power line. The high voltage rod contains two test lines, one is a high voltage line and the other is an external control line. The ground wire is also a test line. Figure 1 As shown, the interfaces on the withstand voltage tester body 3 include an external control interface 31 for connecting the external control line of the high-voltage rod, a high-voltage interface 32 for connecting the high-voltage line of the high-voltage rod, a grounding interface 33 for connecting the grounding line, and a power interface 34 for connecting the power line. During testing, one end of the power line is plugged into the external power supply, and the other end is plugged into the power interface 34 to provide power for the withstand voltage tester body 3. The external control line and the high-voltage line of the high-voltage rod are plugged into the external control interface 31 and the high-voltage interface 32 respectively, and one end of the grounding line is plugged into the grounding interface 33. The test ends of the high-voltage rod and the grounding line are respectively connected to the component to be tested. A high voltage is applied to the component to be tested through the high-voltage rod. The applied voltage can be changed by adjusting the knob on the withstand voltage tester body 3. Whether the component to be tested is broken down and whether there is leakage can be observed through the display screen.

[0028] A positioning block 4 for positioning the cables is provided on the side of the box 1. Since the external control interface 31, high voltage interface 32, grounding interface 33 and power interface 34 are all arranged close to the right side of the box 1, the positioning block 4 is provided on the right side of the box 1. Figure 2As shown, the positioning block 4 includes a long strip-shaped block 41 and fixing plates 42 located on two opposite surfaces in the length direction of the block 41. The two fixing plates 42 and the block 41 are all in contact with the right side of the box body 1. The positioning block 4 is fixed to the box body 1 by fixing bolts 7 that pass through each fixing plate 42 and are connected to the right side of the box body 1. That is, each fixing plate 42 is provided with a bolt through-hole, and threaded holes are respectively provided at corresponding positions on the right side of the box body 1.

[0029] The block 41 is provided with a perforation 411 for the cable to pass through. Three perforations 411 are spaced apart along the length of the positioning block. The three perforations 411 are respectively for the ground wire, the power wire, and the two test wires of the high-voltage rod to pass through. The two test wires of the high-voltage rod are thinner and can pass through the same perforation 411. The block 41 is horizontally arranged, and the center line of each perforation 411 extends vertically, and the center line of each perforation 411 is parallel to the right side of the box 1. This makes it convenient for the cable to pass through the perforation 411 first and then connect to the interface on the top surface of the withstand voltage tester body 3, or the cable to connect to the interface on the top surface of the withstand voltage tester body 3 first and then pass through the perforation 411. In addition, the three perforations 411 are arranged horizontally, consistent with the arrangement direction of the interface, which not only facilitates the cable to pass through from top to bottom without causing the cable to be twisted and deformed, but also prevents the three types of wires from interfering with each other. The distances from the three perforations 411 to the top surface of the withstand voltage tester body 3 are equal, and the lengths of the fixed parts are also basically the same.

[0030] like Figure 2 As shown, the positioning block 4 is threadedly assembled with an adjusting screw 8, and each through-hole 411 is equipped with a corresponding adjusting screw 8. One end of each adjusting screw 8 is located outside the corresponding through-hole 411, and the other end is located inside the corresponding through-hole 411 and is rotatably connected to a pressure plate 10. Specifically, a rotatable shaft 9 is provided on the pressure plate 10, and the end of the adjusting screw 8 is connected to the shaft 9. The axis of rotation of the shaft 9 is coaxial with the axis of the adjusting screw 8. The pressure plate 10 has a pressing surface for approaching and pressing the cable when the adjusting screw 8 rotates forward and moving away from the cable when the adjusting screw 8 rotates reversely. In this way, after the cable passes through the through-hole, the pressing surface of the pressure plate 10 can contact and press the cable by rotating the adjusting screw 8 in the forward direction, thereby fixing the cable. Under the action of the shaft 9, the rotation of the adjusting screw 8 will not affect the pressure plate 10, and the pressure plate 10 only moves in a linear manner. After the cable is secured by the pressure plate 10, even if the cable is subjected to external forces during subsequent testing, the end connected to the withstand voltage tester body 3 will not loosen, ensuring normal use of the device. After the test is completed, the pressing surface of the pressure plate 10 can be moved away from the cable by reversing the adjustment screw 8, facilitating cable removal.

[0031] Furthermore, the pressing plate 10 is semi-annular, so the pressing surface is an arc surface, which can increase the contact area with the cable and improve the pressing effect. At the same time, the pressing plate 10 is made of silica gel, which can form a protective effect while pressing the cable and avoid breaking the cable skin.

[0032] Furthermore, the axes of the adjusting screws 8 are parallel, and one end of each adjusting screw 8 located outside the corresponding through hole 411 is on the same side of the positioning block 4, so that each adjusting screw 8 can be screwed on the same side, making the operation more convenient.

[0033] As Figure 1 shown, a diagonal shoulder strap is connected to the box body 1. The diagonal shoulder strap includes a first shoulder strap 5 and a second shoulder strap 6 respectively connected to two opposite side surfaces of the box body 1. Specifically, the first shoulder strap 5 is connected to the left side surface of the box body 1, and the second shoulder strap 6 is connected to the right side surface of the box body 1. For convenient connection, connecting members 15 ( Figure 4 shown) are respectively arranged on the left and right side surfaces of the box body 1. In addition, a handle 14 is further arranged on the front side surface of the box body 1. In this way, the entire portable box can be carried by hand or carried on the back with the diagonal shoulder strap. When there are more devices to be carried, the entire device can be carried on the back with the diagonal shoulder strap without holding it by hand, thus liberating the hands of the operator and making the operation more flexible.

[0034] In addition, a connecting buckle 51 is arranged at the end of the first shoulder strap 5, and a plurality of limiting holes 61 arranged at intervals along the extending direction of the shoulder strap are arranged at the end of the second shoulder strap 6. The cooperation of the connecting buckle 51 and different limiting holes 61 can adjust the length of the diagonal shoulder strap, so as to facilitate the operator to adjust the appropriate length of the diagonal shoulder strap according to his own height and facilitate the carrying of the device.

[0035] Specifically, as Figure 3 shown, the connecting buckle 51 includes a connecting frame and a limiting pin 513 hinged on the connecting frame and used to pass through the corresponding limiting hole 61. The connecting frame is in the shape of a Chinese character 'Ri', and the connecting frame includes an outer peripheral frame body 511 and a fixing rod 5 fixed inside the outer peripheral frame body 511. The limiting pin 513 is hinged on one side of the outer peripheral frame body 511 and can cross the fixing rod 512 and lap on the opposite side of the outer peripheral frame body 511. The fixing rod 512 divides the outer peripheral frame body 511 into two frame grids. When in use, the end of the second shoulder strap 6 first passes through one of the frame grids, then crosses the fixing rod 512 and passes through the other frame grid, and finally rotates the limiting pin 513 to make it insert into the appropriate limiting hole 61, so as to realize the connection and locking between the two shoulder straps. The connecting buckle 51 with such a structure makes the part of the second shoulder strap 6 passing through the connecting buckle 51 located inside the first shoulder strap 5, avoiding easy warping and deformation when on the outside.

[0036] In addition, as Figure 1 and Figure 4As shown, the bottom of the box body 1 is provided with a plurality of legs, and the bottom surface of each leg is provided with an anti-slip protrusion 13. In this embodiment, there are four legs in total, which are respectively located at the four corners of the bottom of the box body 1. Each leg includes a support 11 and an anti-slip block 12 fixedly connected to the support 11. The support 11 is fixedly connected to the bottom surface of the box body 1. The anti-slip protrusion 13 is fixed on the bottom surface of the anti-slip block 12, and there are multiple anti-slip protrusions 13 on the bottom surface of each anti-slip block 12. In this way, when the equipment is placed on a slope for operation, the anti-slip ability of the box body is relatively strong, which can keep the equipment in a stable state. Furthermore, the anti-slip protrusion 13 is hemispherical, which can further reduce the contact area between the equipment and the slope, increase the pressure, and make the equipment placement more stable.

[0037] In other embodiments of the power electronic equipment withstand voltage tester, the anti-slip protrusion may also be cylindrical or frustum-conical.

[0038] In other embodiments of the power electronic equipment withstand voltage tester: three legs can be provided, arranged in an isosceles triangle. Of course, only two legs can be provided, located at both ends of the bottom of the box in the length direction and in the middle position in the width direction. Of course, it is also necessary to ensure that the contact area between the anti-slip protrusion and the slope is sufficient for the box to be placed stably.

[0039] In other embodiments of the power electronic equipment withstand voltage tester: the legs may no longer include anti-slip blocks, and the anti-slip protrusions may be directly provided on the bottom surface of the pillars; in other embodiments, the box may not include the legs, and the anti-slip protrusions may be directly provided on the bottom surface of the box; in other embodiments, the legs and anti-slip protrusions may not be provided, and the roughness of the bottom surface of the box may be directly increased to improve the anti-slip effect of the box.

[0040] In other embodiments of the power electronic device withstand voltage tester: the box may no longer be provided with a handle, and the entire device can be carried only by a cross-body shoulder strap; of course, in other embodiments, only a handle may be provided, and no cross-body shoulder strap may be provided.

[0041] In other embodiments of the power electronic device withstand voltage tester: the connecting buckle can be connected to the end of the second shoulder strap, and in this case, the end of the first shoulder strap is provided with a plurality of limiting holes arranged at intervals along the extension direction of the shoulder strap.

[0042] In other embodiments of the power electronic device withstand voltage tester: the connecting buckle can also be an adjustment buckle used for the shoulder strap of an ordinary school bag. This adjustment buckle is a sliding type and does not require punching holes on the shoulder strap.

[0043] In other embodiments of the power electronic device withstand voltage tester, the positioning block may only include a block body without a fixing plate. In this case, the positioning block may be bonded and fixed to the side of the box body, or may be integrally formed with the box body.

[0044] In other embodiments of the voltage tester for power electronic equipment: when the voltage tester body has a built-in power supply and there is no need to connect the power cord during testing, only two perforations can be set on the positioning block, one of which is for the grounding wire to pass through, and the other is for the test wire of the high-voltage rod to pass through; in other embodiments, multiple positioning blocks can be set, and only one perforation is set on a positioning block. The number of positioning blocks is set according to the number of interfaces on the voltage tester body, and the positioning blocks are set close to the corresponding interfaces for nearby arrangement; in other embodiments, when the number of interfaces on the voltage tester body is large, only one positioning block can be set for cables that are easy to loosen, and there is only one perforation on the positioning block.

[0045] In other embodiments of the power electronic device withstand voltage tester: when a positioning block is provided with a plurality of through-holes, the through-holes may be arranged vertically, that is, the positioning block is placed vertically, and the center lines of the through-holes extend horizontally.

[0046] In other embodiments of the power electronic device voltage tester: when a positioning block is provided with multiple through holes, the end of each adjusting screw located outside the corresponding through hole may not be on the same side of the positioning block, but on different sides of the positioning block. For example, when there are three through holes and the positioning block is placed horizontally, the adjusting screws corresponding to the front and rear through holes are respectively connected to the front and rear ends of the positioning block, that is, the axes of the two adjusting screws extend forward and backward, and the axis of the adjusting screw corresponding to the middle through hole extends left and right.

[0047] In other embodiments of the power electronic device withstand voltage tester: the shape of the pressure plate may also be V-shaped, and in this case the pressing surfaces are two planes arranged at an angle.

[0048] In other embodiments of the power electronic equipment withstand voltage tester, the pressure plate may also be made of plastic or metal.

[0049] In other embodiments of the power electronic equipment voltage tester: the end of the adjusting screw and the pressure plate can also be directly connected in rotation. For example, the end of the adjusting screw is provided with a mounting head with an outer diameter larger than the diameter of the rod, and the pressure plate is provided with a recessed groove for the mounting head to be installed. After the mounting head is installed, a baffle is fixed on the pressure plate to cover the notch of the recessed groove, thereby preventing the mounting head from falling out. There is a fitting clearance between the baffle and the mounting head, and between the mounting head and the recessed groove to ensure that the mounting head and the recessed groove can rotate freely relative to each other.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. A power electronic device withstand voltage tester, comprising a portable case and a withstand voltage tester body disposed within the portable case, wherein the portable case comprises a case body and a case cover mounted on the top of the case body, and an interface for connecting a cable is disposed on the top surface of the withstand voltage tester body, characterized in that: A positioning block for positioning the cable is provided on the side of the box, and a through-hole is provided on the positioning block for the cable to pass through. The center line of the through-hole is parallel to the side of the box where the positioning block is located. An adjusting screw is threadedly assembled on the positioning block, and one end of the adjusting screw is located outside the through-hole, and the other end is located inside the through-hole and is rotatably connected to a pressure plate, which has a pressing surface for approaching and pressing the cable when the adjusting screw rotates forward and moving away from the cable when the adjusting screw rotates reversely.

2. The power electronic equipment withstand voltage tester according to claim 1, characterized in that: The interfaces on the voltage withstand tester body include a test interface for connecting the test line and a power interface for connecting the power line. The positioning block is in the shape of a long strip, and at least two perforations are arranged at intervals along the length direction of the positioning block. Each perforation is equipped with a corresponding adjusting screw and pressure plate.

3. The power electronic equipment withstand voltage tester according to claim 2, characterized in that: The axes of the adjusting screws are parallel, and the ends of the adjusting screws located outside the corresponding through holes are all located on the same side of the positioning block.

4. The power electronic equipment withstand voltage tester according to claim 2 or 3, characterized in that: The center line of each through hole extends vertically.

5. The power electronic equipment withstand voltage tester according to any one of claims 1 to 3, characterized in that: The two opposite surfaces of the positioning block are respectively provided with fixing plates that fit with the side surfaces of the box body. The positioning block is fixed to the box body by fixing bolts that penetrate the fixing plates and are connected to the side surfaces of the box body.

6. The power electronic equipment withstand voltage tester according to any one of claims 1 to 3, characterized in that: A crossbody strap is attached to the case.

7. The power electronic equipment withstand voltage tester according to claim 6, characterized in that: The cross-body shoulder strap includes a first shoulder strap and a second shoulder strap respectively connected to two opposite side surfaces of the box body, a connecting buckle is provided at the end of one of the first shoulder strap and the second shoulder strap, and a plurality of limiting holes arranged at intervals along the extension direction of the shoulder strap are provided at the end of the other shoulder strap, the connecting buckle includes a connecting frame and a limiting pin hinged on the connecting frame and used to pass through the corresponding limiting holes, the connecting frame is in the shape of a "sun", the connecting frame includes an outer frame body and a fixing rod fixed in the outer frame body, the limiting pin is hinged on one side edge of the outer frame body and can cross the fixing rod and overlap on the other side edge of the outer frame body.

8. The power electronic equipment withstand voltage tester according to claim 6, characterized in that: The box body is also provided with a handle.

9. The power electronic device withstand voltage tester according to any one of claims 1 to 3, characterized in that: The bottom of the box is provided with a plurality of supporting legs, and the bottom surface of each supporting leg is provided with an anti-slip protrusion.

10. The power electronic equipment withstand voltage tester according to claim 9, characterized in that: The anti-slip protrusions are hemispherical.

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