Motor short circuit fault detection equipment

Abstract

The invention belongs to the technical field of motor short circuit detection, and particularly discloses a motor short circuit fault detection device which comprises a short circuit detector body and a connecting mechanism, a connecting plate is installed on one side of the short circuit detector body in an embedded mode, and two through holes which are symmetrically distributed are formed in the surface of the connecting plate. The output end and the input end of the short circuit detector body are respectively positioned in the two through holes; by arranging a connecting mechanism, the stability of the electric clamp in the using process can be guaranteed, the situation that falling is caused by vibration is avoided, a sliding plate can be pushed to slide along the inner wall of an adjusting cavity by injecting liquid into the adjusting cavity, and in the process, a limiting rod can be driven to be inserted into a limiting groove; limiting between the connecting shaft and the connecting shell is achieved, then limiting between the two clamping plates is achieved, the possibility that the clamping plates fall off due to vibration is prevented, and the detection precision is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor short - circuit detection, and specifically discloses a motor short - circuit fault detection device. Background Art

[0002] In large - scale motor groups, the conductors of motor windings are wound by multiple electromagnetic wires (i.e., strands), and the surfaces of the electromagnetic wires are covered with insulating layers. The conductors of motor windings must ensure that any two strands are insulated from each other within a certain length range to ensure that the motor windings meet the operating requirements. During the operation of the motor, the motor windings are easily affected by factors such as starting impact current, harmonic current, external impact, rain corrosion, insulation damage, and pollutant intrusion. As a result, faults such as short - circuit, open - circuit, or grounding may occur in the motor windings.

[0003] Existing short - circuit fault detection devices mainly use the current after the short - circuit of the motor winding to determine whether there is a short - circuit in the motor winding and to determine the location of the short - circuit. During use, the motor winding is clamped and energized through electric clamps. However, in the operating environment of large - scale motors, multiple sets of motors are usually used in combination, and a rotation maintenance method is often adopted, that is, the motors other than the one being maintained still operate normally. This will cause vibrations during the maintenance process, easily resulting in the detachment of the electric clamps and affecting the detection effect. Therefore, those skilled in the art have proposed a motor short - circuit fault detection device to solve the above - mentioned problems. Summary of the Invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a motor short - circuit fault detection device to solve the problem that vibrations during the maintenance process in the prior art easily cause the detachment of the electric clamps and affect the detection effect.

[0005] To achieve the above - mentioned purpose, the present invention provides a motor short - circuit fault detection device, including a short - circuit detector body and a connection mechanism. A connection plate is embedded on one side of the short - circuit detector body. The surface of the connection plate is provided with two symmetrically distributed through - holes, and the output end and the input end of the short - circuit detector body are respectively located inside the two through - holes. One end of the connection mechanism can be connected to the output end and the input end of the short - circuit detector body, and the other end of the connection mechanism can be connected to the motor to be tested; Among them, the connection mechanism includes a clamping component and a protection component. The clamping component is used to quickly connect to the detection end of the motor to be tested, and the protection component is used to improve the stability of the clamping component; The clamping component includes a connection wire. One end of the connection wire is provided with a connection head that matches the output end and the input end of the short - circuit detector body. The other end of the connection wire is fixedly connected with an electric clamp. The surface of the connection wire is fixedly connected with a connection pipe, and a diversion channel is opened inside the connection pipe; The electric clamp consists of two clamping plates. A rotating shaft is fixedly connected to the surface of one of the clamping plates, and a connecting shell is fixedly connected to the surface of the other clamping plate; The top of the rotating shaft is fixedly connected to a connecting shaft that is rotatably connected to the inner wall of the connecting shell. Annularly distributed limiting grooves are formed on the surface of the connecting shaft. An adjusting cavity is formed inside the connecting shell. A sliding plate is slidably connected to the inner wall of the adjusting cavity. A limiting rod that matches the limiting groove is fixedly connected to one side of the sliding plate close to the connecting shaft. A third spring is fixedly connected between the other side of the sliding plate and the inner wall of the adjusting cavity; A conduit communicating with the adjusting cavity is provided on the surface of the connecting shell, and the other end of the conduit communicates with the diversion channel.

[0006] In the above technical solution, preferably, the other end of the rotating shaft penetrates through the other clamping plate and is rotatably connected to the inner wall of the connecting shell. A hairspring is fixedly connected between the surface of the rotating shaft and the inner wall of the connecting shell.

[0007] In the above technical solution, preferably, the protection component includes a mounting sleeve fixedly connected to the surface of the connecting line. A connecting sleeve is fixedly connected to the surface of the mounting sleeve. A chute is formed on one side of the connecting sleeve away from the electric clamp. A sliding cavity is formed inside the connecting sleeve. A slot communicating with the sliding cavity is formed on one side of the connecting sleeve away from the electric clamp. The slot communicates with the chute, and the inner diameter of the opening of the slot is larger than the inner diameter of the opening of the chute.

[0008] In the above technical solution, preferably, the protection component further includes two connecting rods fixedly connected to the surface of the connecting plate and located above the two through holes respectively. The other ends of the connecting rods are fixedly connected to a lock block formed integrally. The cross-sectional shape of the lock block is a right trapezoid, and the height of the lock block is equal to the inner diameter of the opening of the slot. The height of the connecting rod is equal to the inner diameter of the opening of the chute.

[0009] In the above technical solution, preferably, a mounting block is slidably connected to the inner wall of the sliding cavity. A mounting groove matching the lock block is formed at the bottom of the mounting block. A baffle is slidably connected to the inner wall of the mounting groove. A sliding plate is slidably connected to the inner wall of the mounting block. A second spring is fixedly connected between the top of the sliding plate and the inner wall of the mounting block. The upper end of the baffle penetrates through the mounting block and is fixedly connected to the bottom of the sliding plate. A mounting rod is fixedly connected to the top of the sliding plate. The upper end of the mounting rod penetrates through the connecting sleeve and is fixedly connected to a pulling plate.

[0010] In the above technical solution, preferably, a liquid storage cavity is provided inside the connection sleeve. A pressing block is slidably connected to the inner wall of the liquid storage cavity. One side of the pressing block is fixedly connected to an adjusting rod. The other end of the adjusting rod penetrates through the liquid storage cavity and is fixedly connected to the surface of the mounting block. A first spring is fixedly connected between the other side of the pressing block and the inner wall of the liquid storage cavity. The inside of the liquid storage cavity is filled with hydraulic oil.

[0011] In the above technical solution, preferably, a connection channel communicating with the diversion channel is provided inside the mounting sleeve. A drainage channel communicating with the liquid storage cavity is provided inside the mounting sleeve. The connection channel is communicated with the liquid storage cavity through the drainage channel.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up the connection mechanism, the stability during the use of the electric clamp can be ensured, and the situation of falling off due to vibration can be avoided. By injecting liquid into the adjustment cavity, the sliding plate can be pushed to slide along the inner wall of the adjustment cavity. During this process, the limiting rod can be driven to insert into the limiting groove, realizing the limitation between the connection shaft and the connection shell, and further realizing the limitation between the two clamping plates, so as to prevent the clamping plates from falling off caused by vibration and improve the detection accuracy.

[0013] 2. During the connection of the connecting wire, the locking block can be inserted into the sliding cavity through the slot. Rotating the connecting sleeve can drive the connecting rod to slide along the inner wall of the chute. At this time, the locking block is misaligned with the slot, so that the separation of the connection sleeve and the locking block can be restricted, ensuring the stability of the connection of the connector during the test. At the same time, the position of the mounting block can be rotated and adjusted to further limit the position of the locking block, further ensuring the stability of the connection of the connector, avoiding the possibility of reverse loosening caused by vibration, and reducing the situation that the loosening or falling off of the connector due to vibration affects the detection effect.

[0014] 3. During the rotation of the pulling plate, the synchronous rotation of the mounting block can drive the adjusting rod to insert into the liquid storage cavity, thereby driving the pressing block to squeeze the hydraulic oil stored in the liquid storage cavity, so that the hydraulic oil is introduced into the diversion channel through the drainage channel and the connection channel, and then can be injected into the adjustment cavity through the conduit to realize the limitation of the electric clamp. The synchronization is strong and no separate operation is required, effectively improving the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the present invention; Figure 2 is a separation schematic diagram of the connection mechanism of the present invention and the short-circuit detector body; Figure 3 is a distribution schematic diagram of the connecting rod of the present invention; Figure 4 is Figure 3Enlarged view of A; Figure 5 Schematic diagram of the distribution of the slots and chutes of the present invention; Figure 6 Schematic sectional view of the connecting sleeve of the present invention; Figure 7 Schematic connection diagram of the mounting block and the pull plate of the present invention; Figure 8 Schematic diagram of the distribution of the diversion channel, the connection channel and the drainage channel of the present invention; Figure 9 Schematic connection diagram of the connecting pipe, the conduit and the electric clamp of the present invention; Figure 10 is Figure 9 Enlarged view of B.

[0016] In the figure: 1, short - circuit detector body; 101, connecting plate; 102, connecting rod; 103, locking block; 2, connecting mechanism; 201, connecting sleeve; 202, mounting sleeve; 203, connecting wire; 204, chute; 205, pull plate; 206, slot; 207, adjusting rod; 208, mounting block; 209, first spring; 210, extrusion block; 211, second spring; 212, mounting rod; 213, baffle; 214, sliding plate; 215, liquid storage cavity; 216, connecting pipe; 217, diversion channel; 218, connection channel; 219, drainage channel; 220, electric clamp; 221, conduit; 222, connection shell; 223, spring; 224, rotating shaft; 225, sliding plate; 226, third spring; 227, adjusting cavity; 228, limiting rod; 229, connecting shaft; 230, limiting groove; 231, sliding cavity. Detailed implementation manners

[0017] In order to more clearly understand the above - mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0018] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the limitations of the specific embodiments disclosed below.

[0019] As Figures 1 - 10 shown, a motor short - circuit fault detection device includes a short - circuit detector body 1 and a connecting mechanism 2. A connecting plate 101 is embedded on one side of the short - circuit detector body 1. The surface of the connecting plate 101 is provided with two symmetrically distributed through - holes, and the output end and the input end of the short - circuit detector body 1 are respectively located inside the two through - holes. One end of the connecting mechanism 2 can be connected to the output end and the input end of the short - circuit detector body 1, and the other end of the connecting mechanism 2 can be connected to the motor to be tested; Among them, the connecting mechanism 2 includes a clamping component and a protection component. The clamping component is used to quickly connect with the detection end of the motor to be tested, and the protection component is used to improve the stability of the clamping component.

[0020] As Figures 1 - 10 shown, the clamping component includes a connecting wire 203. One end of the connecting wire 203 is provided with a connector that matches the output end and the input end of the short-circuit detector body 1. The other end of the connecting wire 203 is fixedly connected to an electric clamp 220. The surface of the connecting wire 203 is fixedly connected to a connecting pipe 216, and a diversion channel 217 is opened inside the connecting pipe 216.

[0021] The electric clamp 220 is composed of two clamping plates. One of the clamping plates is fixedly connected with a rotating shaft 224 on its surface, and the other clamping plate is fixedly connected with a connecting shell 222 on its surface. The other end of the rotating shaft 224 penetrates through the other clamping plate and is rotatably connected to the inner wall of the connecting shell 222. A spring 223 is fixedly connected between the surface of the rotating shaft 224 and the inner wall of the connecting shell 222.

[0022] The top of the rotating shaft 224 is fixedly connected with a connecting shaft 229 that is rotatably connected to the inner wall of the connecting shell 222. The surface of the connecting shaft 229 is provided with annularly distributed limiting grooves 230. An adjusting cavity 227 is opened inside the connecting shell 222. A sliding plate 225 is slidably connected to the inner wall of the adjusting cavity 227. A limiting rod 228 that matches the limiting groove 230 is fixedly connected to one side of the sliding plate 225 close to the connecting shaft 229. A third spring 226 is fixedly connected between the other side of the sliding plate 225 and the inner wall of the adjusting cavity 227.

[0023] The surface of the connecting shell 222 is provided with a conduit 221 that communicates with the adjusting cavity 227, and the other end of the conduit 221 communicates with the diversion channel 217.

[0024] The electric clamp 220 can quickly connect with the connection end of the motor to be tested, and the connector on the connecting wire 203 is connected to the output end and the input end of the short-circuit detector body 1, so as to facilitate the detection of the motor to be tested by the short-circuit detector body 1; Among them, the short-circuit detector body 1 uses the current after the motor winding is short-circuited to judge whether there is a short circuit in the motor winding and determine the position of the short circuit.

[0025] In the process of using the existing electric clamp 220, the two clamping plates are mainly pressed to rotate around the rotating shaft 224, so as to make the two clamping plates move away from each other, so as to adapt to clamping at different positions. During this process, the connecting shell 222 and the rotating shaft 224 make opposite circular motions, so as to tighten the clockwork spring 223, and then the two clamping plates can be driven to reset under the action of the clockwork spring 223 to achieve the purpose of clamping. However, during the detection process, the surrounding vibration is likely to cause the clamping plates to fall off, and the clamping effect is poor only by the clamping force generated by the clockwork spring 223. Therefore, by injecting liquid into the adjustment cavity 227, the sliding plate 225 can be pushed to slide along the inner wall of the adjustment cavity 227. During this process, the limiting rod 228 can be driven to insert into the limiting groove 230, so as to realize the limit between the connecting shaft 229 and the connecting shell 222, and then realize the limit between the two clamping plates, so as to prevent the clamping plates from falling off caused by vibration and improve the detection accuracy. As Figures 9 - 10 shown in the state when liquid is injected into the adjustment cavity 227. At this time, the third spring 226 is in a stretched state. Under normal conditions, the third spring 226 can drive the sliding plate 225 to make the limiting rod 228 contract inside the adjustment cavity 227.

[0026] As Figures 1 - 10 shown, the protection component includes an installation sleeve 202 fixedly connected to the surface of the connecting line 203. A connecting sleeve 201 is fixedly connected to the surface of the installation sleeve 202. A sliding groove 204 is opened on one side of the connecting sleeve 201 away from the electric clamp 220. A sliding cavity 231 is opened inside the connecting sleeve 201. A slot 206 communicating with the sliding cavity 231 is opened on one side of the connecting sleeve 201 away from the electric clamp 220. The slot 206 communicates with the sliding groove 204, and the inner diameter of the slot 206 is larger than the inner diameter of the sliding groove 204.

[0027] The protection component also includes two connecting rods 102 fixedly connected to the surface of the connecting plate 101 and located above the two through holes respectively. The other ends of the connecting rods 102 are fixedly connected with an integrally formed locking block 103. The cross-sectional shape of the locking block 103 is a right trapezoid, and the height of the locking block 103 is equal to the inner diameter of the slot 206, and the height of the connecting rod 102 is equal to the inner diameter of the sliding groove 204.

[0028] An installation block 208 is slidably connected to the inner wall of the sliding cavity 231. An installation groove matching the locking block 103 is opened at the bottom of the installation block 208. A baffle 213 is slidably connected to the inner wall of the installation groove. A sliding plate 214 is slidably connected to the inner wall of the installation block 208. A second spring 211 is fixedly connected between the top of the sliding plate 214 and the inner wall of the installation block 208. The upper end of the baffle 213 penetrates through the installation block 208 and is fixedly connected to the bottom of the sliding plate 214. An installation rod 212 is fixedly connected to the top of the sliding plate 214. The upper end of the installation rod 212 penetrates through the connecting sleeve 201 and is fixedly connected to a pulling plate 205.

[0029] During the process of connecting the connector to the output end and the input end of the short - circuit detector body 1, the locking block 103 can be inserted into the interior of the sliding cavity 231 through the slot 206, and by rotating the connecting sleeve 201, the connecting rod 102 can be driven to slide along the inner wall of the chute 204. At this time, the locking block 103 is misaligned with the slot 206, so that the separation of the connecting sleeve 201 and the locking block 103 can be restricted, ensuring the stability of the connection of the connector during the test and avoiding the possibility of falling off. And by rotating the pull - plate 205 to adjust the position of the mounting block 208, during this process, the locking block 103 can be driven to pass through the mounting groove and use its inclined surface to squeeze the baffle 213 to move upward while compressing the second spring 211. Until the locking block 103 passes through the baffle 213, it can drive the baffle 213 to reset under the action of the second spring 211. At this time, when the connecting sleeve 201 is reversed, since the baffle 213 blocks the right - angled side of the locking block 103 and makes it unable to be reversed, the stability of the connection of the connector is further ensured, avoiding the possibility of reverse loosening caused by vibration, and reducing the situation that the loosening or falling off of the connector due to vibration affects the detection effect.

[0030] As Figures 1 - 10 shown, a liquid - storage cavity 215 is formed inside the connecting sleeve 201. A squeezing block 210 is slidably connected to the inner wall of the liquid - storage cavity 215. One side of the squeezing block 210 is fixedly connected to an adjusting rod 207. The other end of the adjusting rod 207 penetrates through the liquid - storage cavity 215 and is fixedly connected to the surface of the mounting block 208. A first spring 209 is fixedly connected between the other side of the squeezing block 210 and the inner wall of the liquid - storage cavity 215. The liquid - storage cavity 215 is filled with hydraulic oil.

[0031] A connection channel 218 communicating with the diversion channel 217 is formed inside the mounting sleeve 202. A drainage channel 219 communicating with the liquid - storage cavity 215 is formed inside the mounting sleeve 202. The connection channel 218 is communicated with the liquid - storage cavity 215 through the drainage channel 219.

[0032] During the process of rotating the pull - plate 205, the synchronous rotation of the mounting block 208 can drive the adjusting rod 207 to insert into the interior of the liquid - storage cavity 215, thereby driving the squeezing block 210 to squeeze the hydraulic oil stored inside the liquid - storage cavity 215, so that the hydraulic oil is introduced into the interior of the diversion channel 217 through the drainage channel 219 and the connection channel 218, and then can be injected into the adjusting cavity 227 through the conduit 221 to realize the limitation of the electric clamp 220.

[0033] Working principle: The electric clamp 220 can quickly connect to the connection end of the motor to be tested, and the connector on the connecting wire 203 is connected to the output end and the input end of the short-circuit detector body 1, so as to facilitate the detection of the motor to be tested by the short-circuit detector body 1. During the connection of the connector to the output end and the input end of the short-circuit detector body 1, the lock block 103 can be inserted into the inside of the sliding cavity 231 through the slot 206, and rotating the connecting sleeve 201 can drive the connecting rod 102 to slide along the inner wall of the sliding groove 204. At this time, the lock block 103 is misaligned with the slot 206, so that the separation of the connecting sleeve 201 and the lock block 103 can be restricted, ensuring the stability of the connection of the connector during the test, avoiding the possibility of falling off, and rotating the adjusting plate 205 to adjust the position of the mounting block 208. During this process, the lock block 103 can be driven to pass through the mounting groove and use its inclined surface to squeeze the baffle 213 to move upward while compressing the second spring 211 until the lock block 103 passes through the baffle 213 and can drive the baffle 213 to reset under the action of the second spring 211. At this time, reversing the connecting sleeve 201 is blocked by the baffle 213 from the right-angled side of the lock block 103 and cannot be reversed, further ensuring the stability of the connection of the connector, avoiding the possibility of reverse loosening caused by vibration, and reducing the situation that the loosening or falling off of the connector caused by vibration affects the detection effect.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A motor short circuit fault detection device, comprising a short circuit detector body (1) and a connecting mechanism (2), characterized in that: A connecting plate (101) is embedded and installed on one side of the short-circuit detector body (1); two through holes are opened on the surface of the connecting plate (101) and are symmetrically distributed; the output end and the input end of the short-circuit detector body (1) are respectively located inside the two through holes; one end of the connecting mechanism (2) can be connected to the output end and the input end of the short-circuit detector body (1); and the other end of the connecting mechanism (2) can be connected to the motor to be tested; The connection mechanism (2) comprises a clamping assembly and a protective assembly, wherein the clamping assembly is used to quickly connect to the detection end of the motor to be tested, and the protective assembly is used to improve the stability of the clamping assembly; The clamping assembly comprises a connecting wire (203), one end of the connecting wire (203) being provided with a connector matching the output end and the input end of the short-circuit detector body (1), the other end of the connecting wire (203) being fixedly connected to an electric clamp (220), the surface of the connecting wire (203) being fixedly connected to a connecting tube (216), the interior of the connecting tube (216) being provided with a flow guide channel (217); The electric clamp (220) is composed of two clamping plates, wherein a rotating shaft (224) is fixedly connected to the surface of one of the clamping plates, and a connecting shell (222) is fixedly connected to the surface of the other clamping plate; A connecting shaft (229) rotatably connected to the inner wall of the connecting shell (222) is fixedly connected to the top of the rotating shaft (224); a surface of the connecting shaft (229) is provided with annularly distributed limiting grooves (230); an adjusting cavity (227) is provided inside the connecting shell (222); a sliding plate (225) is slidably connected to the inner wall of the adjusting cavity (227); a limiting rod (228) matching the limiting groove (230) is fixedly connected to one side of the sliding plate (225) close to the connecting shaft (229); and a third spring (226) is fixedly connected between the other side of the sliding plate (225) and the inner wall of the adjusting cavity (227); A conduit (221) connected to the regulating cavity (227) is provided on the surface of the connecting shell (222), and the other end of the conduit (221) is connected to the flow guide channel (217).

2. A motor short circuit fault detection device according to claim 1, characterized in that: The other end of the rotating shaft (224) passes through another clamping plate and is rotatably connected to the inner wall of the connecting shell (222), and a clockwork spring (223) is fixedly connected between the surface of the rotating shaft (224) and the inner wall of the connecting shell (222).

3. A motor short circuit fault detection device according to claim 1, characterized in that: The protective component comprises a mounting sleeve (202) fixedly connected to the surface of the connecting wire (203); a connecting sleeve (201) is fixedly connected to the surface of the mounting sleeve (202); a sliding groove (204) is provided on a side of the connecting sleeve (201) away from the electric clamp (220); a sliding cavity (231) is provided inside the connecting sleeve (201); a slot (206) connected to the sliding cavity (231) is provided on a side of the connecting sleeve (201) away from the electric clamp (220); the slot (206) is connected to the sliding groove (204); and the inner diameter of the slot (206) is larger than the inner diameter of the slot (204).

4. A motor short circuit fault detection device according to claim 3, characterized in that: The protection component further comprises two connecting rods (102) fixedly connected to the surface of the connecting plate (101) and respectively located above the two through holes, the other end of the connecting rod (102) being fixedly connected to an integrally formed locking block (103), the cross-sectional shape of the locking block (103) being a right-angled trapezoid, the height of the locking block (103) being equal to the inner diameter of the slot (206), and the height of the connecting rod (102) being equal to the inner diameter of the slot (204).

5. A motor short circuit fault detection device according to claim 4, characterized in that: The inner wall of the sliding cavity (231) is slidably connected to a mounting block (208); a mounting groove matching the locking block (103) is formed at the bottom of the mounting block (208); a baffle (213) is slidably connected to the inner wall of the mounting groove; a slide plate (214) is slidably connected to the inner wall of the mounting block (208); a second spring (211) is fixedly connected between the top of the slide plate (214) and the inner wall of the mounting block (208); the upper end of the baffle (213) passes through the mounting block (208) and is fixedly connected to the bottom of the slide plate (214); the top of the slide plate (214) is fixedly connected to a mounting rod (212); the upper end of the mounting rod (212) passes through a connecting sleeve (201) and is fixedly connected to a pull plate (205).

6. A motor short circuit fault detection device according to claim 5, characterized in that: A liquid storage cavity (215) is provided inside the connecting sleeve (201), and an extrusion block (210) is slidably connected to the inner wall of the liquid storage cavity (215); an adjustment rod (207) is fixedly connected to one side of the extrusion block (210); the other end of the adjustment rod (207) passes through the liquid storage cavity (215) and is fixedly connected to the surface of the mounting block (208); a first spring (209) is fixedly connected between the other side of the extrusion block (210) and the inner wall of the liquid storage cavity (215); and the interior of the liquid storage cavity (215) is filled with hydraulic oil.

7. A motor short circuit fault detection device according to claim 6, characterized in that: A connecting channel (218) communicating with the flow guide channel (217) is provided inside the installation sleeve (202), a drainage channel (219) communicating with the liquid storage chamber (215) is provided inside the installation sleeve (202), and the connecting channel (218) is connected with the liquid storage chamber (215) via the drainage channel (219).

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