Protection device for preventing high-voltage motor from overheating

Abstract

The utility model relates to a protection device for preventing overheating of a high-voltage motor. The device comprises a driving assembly and a protection assembly, the driving assembly comprises a barrel and a push rod, the push rod is slidably connected into the barrel, and the barrel is filled with a thermal expansion medium used for driving the push rod to stretch out and draw back; the protection assembly comprises a first sliding plate, a second sliding plate, an ejector pin and a trigger assembly, the first sliding plate is slidably connected in the guide rail, the first sliding plate can be driven through the push rod, a fixing block is arranged on the first sliding plate, the first sliding plate is further slidably connected with the second sliding plate, and one end of the second sliding plate is fixedly connected with the ejector pin corresponding to the circuit breaker. The other end of the guide rail is connected with the fixing block through a spring, and a trigger assembly used for exciting the ejector pin is further installed on the guide rail. According to the scheme provided by the invention, when a high-temperature environment is formed in the high-voltage motor, a protection mechanism can be automatically triggered, power supply is cut off, and the safety in the use process is ensured.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric motors, in particular to a protection device for preventing overheating of a high-voltage motor. BACKGROUND

[0002] The high-voltage motor first appeared in the late 19th century. With the development of the electric power industry, the high-voltage motor has been widely used. In the early 20th century, the high-voltage motor has been widely used in power plants, transportation, manufacturing and other fields. Through years of research and development, the rated voltage of the high-voltage motor has been continuously improved, and the efficiency and reliability of the motor have also been improved. Now, the high-voltage motor has been applied to many fields, such as automobile manufacturing, mechanical manufacturing, chemical industry and petroleum industry, and has become an indispensable part of modern industry.

[0003] In order to ensure safety, the insulation layer of the high-voltage motor is usually thick (up to 5-10 mm), and the thermal conductivity of the insulation layer is generally low, which easily forms a thermal barrier structure that hinders heat dissipation. In the running process, the basic heat generated by the winding copper loss and the core loss, and the high-temperature energy converted by the local discharge, will continuously accumulate in the high-voltage motor, forming a high-temperature environment. If the high-voltage motor continues to work in a high-temperature state, multiple problems such as insulation breakdown, bearing jamming and electromagnetic imbalance will occur, which will greatly reduce its service life. CONTENT OF THE UTILITY MODEL

[0004] In order to solve or partially solve the problems in the related art, the application provides a protection device for preventing overheating of a high-voltage motor. When a high-temperature environment is formed in the high-voltage motor, the device can automatically trigger a protection mechanism to cut off the power supply and ensure safety during use.

[0005] The application provides a protection device for preventing overheating of a high-voltage motor, comprising:

[0006] A driving assembly, the driving assembly comprises a cylinder and a push rod, the push rod is slidingly connected in the cylinder, and the cylinder is filled with a thermal expansion medium for driving the push rod to expand and contract;

[0007] A protection assembly, the protection assembly comprises a first sliding plate, a second sliding plate, a thimble and a trigger assembly, the first sliding plate is slidingly connected in a guide rail and can be driven by the push rod, a fixed block is arranged on the first sliding plate, the second sliding plate is also slidingly connected to the first sliding plate, a thimble corresponding to a power breaker is fixedly connected to one end of the second sliding plate, and the other end of the second sliding plate is connected to the fixed block through a spring, and the trigger assembly for triggering the thimble is also installed on the guide rail.

[0008] Optionally, in some embodiments, the triggering assembly comprises a pressure rod, a contact block, a support, the support is fixedly connected to the guide rail, and the pressure rod is hingedly connected to the support, and the contact block corresponding to the second sliding plate is arranged on the pressure rod, wherein a torsion spring is also installed at the hinge connection between the support and the pressure rod, so that the contact block is always pressed against the second sliding plate.

[0009] Optionally, in some embodiments, the second sliding plate is provided with a clamping block corresponding to the contact block.

[0010] Optionally, in some embodiments, the fixed block is inclined on the side facing the pressure rod, so that the pressure rod is squeezed and lifted when it contacts the fixed block.

[0011] Optionally, in some embodiments, the fixed block is provided with a measuring needle on the side away from the second sliding plate, and the measuring needle penetrates and extends out of the protective shell.

[0012] Optionally, in some embodiments, the push rod and the first sliding plate are connected through a gear transmission.

[0013] Optionally, in some embodiments, a gear is rotatably installed in the protective shell, a rack engaged with the gear is fixedly connected to the end of the push rod, and a driving tooth engaged with the gear is arranged on the bottom of the first sliding plate.

[0014] The technical scheme provided by the present application can include the following beneficial effects:

[0015] The present application utilizes the thermal expansion and contraction characteristics of the thermal expansion medium as a triggering power source. When the temperature in the high-voltage motor reaches a threshold value, the thermal expansion medium starts the triggering assembly, the protection assembly is started, the ejection ejector pin hits the mechanical tab of the circuit breaker, thereby timely cutting off the power supply, and ensuring the safety of the use process.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to the like elements throughout the drawings, and in which:

[0018] Figure 1 is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 is a schematic diagram of the overall structure of the present application from another perspective;

[0020] Figure 3 is a schematic diagram of the local structure of the present application;

[0021] Figure 4 is a schematic view of the installation position of the present application.

[0022] Reference signs:

[0023] 1 - high voltage motor; 2 - electric box; 3 - protective shell; 4 - cylinder; 5 - push rod; 6 - rack; 7 - gear; 8 - first sliding plate; 9 - fixed block; 10 - second sliding plate; 11 - measuring needle; 12 - thimble; 13 - spring; 14 - clamping block; 15 - guide rail; 16 - pressing rod; 17 - abutting block; 18 - support; 19 - dust cover. DETAILED DESCRIPTION

[0024] Embodiments of the present application will be described in more detail by referring to the attached drawings. Although embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0025] It should be understood that although the terms "first", "second", "third", etc. can be used in this application to describe various information, these information should not be limited by these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present application. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0026] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0027] Unless otherwise defined, the terms "mounting", "connected", "connecting", "fixed", and the like are to be construed in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0028] Referring to Figure 4 , the high-voltage motor 1 is provided with an electric box 2 on the side for controlling the start and stop of the motor and the running state. If the space in the electric box 2 is sufficient, the device can be directly installed in the electric box 2, or the space of the electric box 2 can be expanded by the protective shell 3, so as to facilitate the installation of the device; a dust cover 19 for ventilation is also usually provided on the top of the high-voltage motor 1 to facilitate heat dissipation.

[0029] Referring to Figures 1-3 , a protection device for preventing high-voltage motor from overheating, comprising:

[0030] The driving assembly, referring to Figure 3 , the driving assembly comprises a cylinder 4 and a push rod 5. The cylinder 4 is in a hollow structure and is fixedly installed in the protective shell 3 in a transverse direction. The push rod 5 is slidably connected in the cylinder 4, and the cylinder 4 is filled with a thermal expansion medium for driving the push rod 5 to extend and retract. The thermal expansion medium can be selected from mercury, silicone oil and other high-expansion-rate substances that can be used to drive the push rod 5. In the motor field, methylphenyl silicone oil is mainly used. It should be noted that since the thermal expansion medium is usually in a liquid state, in order to avoid leakage, the sealing between the push rod 5 and the cylinder 4 needs to be ensured. The cylinder 4 is made of a material with high thermal conductivity.

[0031] The protection assembly comprises a first sliding plate 8, a second sliding plate 10, a thimble 12 and a trigger assembly. A guide rail 15 is fixedly installed in the protective shell 3. The first sliding plate 8 is slidably connected in the guide rail 15 and can be driven by the push rod 5 to slide on the guide rail 15. In order to ensure the reliability of power transmission, gear transmission is adopted in this embodiment. Specifically, a gear 7 is rotatably installed in the protective shell 3. A rack 6 engaged with the gear 7 is fixedly connected to the end of the push rod 5. The bottom of the first sliding plate 8 is provided with a driving tooth engaged with the gear 7. When the push rod 5 is elongated or shortened, the gear 7 can be driven to rotate, thereby driving the first sliding plate 8 to slide at the guide rail 15. Referring to Figure 1A groove is provided on the top surface of the first slide plate 8, and a fixing block 9 is provided at the end of the groove. A second slide plate 10 is slidably connected in the groove. One end of the second slide plate 10 is fixedly connected to the ejector pin 12 of the corresponding circuit breaker (not shown in the figure), and the other end is connected to the fixing block 9 through a spring 13. A triggering component for activating the ejector pin 12 is also installed on the guide rail 15.

[0032] See Figure 2 The triggering assembly includes a pressure rod 16, an abutment block 17, and a support 18. The support 18 is fixedly connected to the guide rail 15, and the pressure rod 16 is hinged to the support 18. The abutment block 17 corresponding to the second slide plate 10 is fixedly installed on the pressure rod 16. A torsion spring is also installed at the hinge point between the support 18 and the pressure rod 16. Under the action of the torsion spring, the abutment block 17 is always pressed against the top surface of the second slide plate 10. Furthermore, a locking block 14 corresponding to the abutment block 17 is fixedly installed on the second slide plate 10. Further, the side of the fixing block 9 facing the pressure rod 16 has an inclined structure, so that when the pressure rod 16 contacts the fixing block 9, it is squeezed and lifted, thereby releasing the restriction on the locking block 14, thus activating the ejector pin 12, causing the ejector pin 12 to collide with the circuit breaker lever and cut off the power supply. Furthermore, to facilitate staff in judging the temperature inside the high-voltage motor 1, a measuring needle 11 is fixedly installed on the side of the fixing block 9 away from the second slide plate 10. The measuring needle 11 penetrates and extends out of the protective shell 3. The longer the measuring needle 11 extends out of the protective shell 3, the lower the temperature inside the high-voltage motor 1.

[0033] Specific work process:

[0034] When the high-voltage motor 1 is at normal temperature, the thermal expansion medium is in a contracted state, the push rod 5 retracts, the first slide plate 8 is located at the end of the guide rail 15, and at this time, the measuring needle 11 extends out of the protective shell 3 by a large margin.

[0035] by Figure 2 For example, when the internal temperature of the high-voltage motor 1 rises abnormally, heat is transferred to the electrical box 2 through conduction via the metal casing, hot air convection, and cable conduction, causing the temperature inside the electrical box 2 to rise accordingly. The heat is conducted through the cylinder 4 to the thermal expansion medium, causing the thermal expansion medium to gradually expand. This causes the push rod 5 to gradually extend to the left, driving the gear 7 to rotate via the rack 6, causing the first slide plate 8 to gradually slide to the right until the locking block 14 contacts the contact block 17. At this time, the end of the ejector pin 12 is directly opposite the circuit breaker lever. As the measuring needle 11 slides to the right along with the first slide plate 8, its length extending out of the protective casing 3 becomes shorter. It should be noted that since the expansion volume of the thermal expansion medium is not linearly related to the temperature, the extension of the measuring needle 11 is only used as a basis for judging whether the temperature is abnormal, and the temperature value inside the electrical box 2 cannot be directly obtained from the extension of the measuring needle 11.

[0036] With the temperature continues to rise, the first slide 8 continues to slide to the right, but the second slide 10 because of the block 14 stuck, can not move to the right, so that the spring 13 is gradually compressed, accumulation of elastic force; with the first slide 8 continues to move right, fixed block 9 and pressure bar 16 contact, extrusion, in the fixed block 9 under the action of the inclined surface, will pressure bar 16 jacking, thereby making the resistance block 17 lift off the constraint of the block 14, at this time the spring 13 release, through the elastic force will the ejector pin 12 and hit the circuit breaker, cut off the power, to ensure the safety of the use of high voltage motor 1 process.

[0037] Finally, it should be noted that in this document, such as first and second relationships belong to only to distinguish one entity or operation with another entity or operation, and does not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term includes, includes or any other variant is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements, not only includes those elements, but also includes other elements not explicitly listed, or also includes the inherent elements of such process, method, article or equipment.

[0038] The above has described the embodiments of the present application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical application or improvement of the technology in the market, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.

Claims

1. A protective device for preventing overheating of a high-voltage motor, characterized in that: include The driving assembly includes a cylinder (4) and a push rod (5), the push rod (5) being slidably connected inside the cylinder (4), and the cylinder (4) being filled with a thermal expansion medium for driving the push rod (5) to extend and retract. The protection component includes a first slide plate (8), a second slide plate (10), a pin (12), and a trigger component. The first slide plate (8) is slidably connected in the guide rail (15). The first slide plate (8) can be driven by a push rod (5). A fixing block (9) is provided on the first slide plate (8), and the second slide plate (10) is also slidably connected to the first slide plate (8). One end of the second slide plate (10) is fixedly connected to the pin (12) of the corresponding circuit breaker, and the other end is connected to the fixing block (9) by a spring (13). A trigger component for activating the pin (12) is also installed on the guide rail (15).

2. The protection device for preventing overheating of a high-voltage motor according to claim 1, characterized in that: The triggering assembly includes a pressure rod (16), an abutment block (17), and a support (18). The support (18) is fixedly connected to the guide rail (15), and the pressure rod (16) is hinged on the support (18). The pressure rod (16) is provided with an abutment block (17) corresponding to the second slide plate (10). A torsion spring (13) is also installed at the hinge of the support (18) and the pressure rod (16) so that the abutment block (17) always presses the second slide plate (10).

3. The protection device for preventing overheating of a high-voltage motor according to claim 2, characterized in that: The second slide (10) is provided with a corresponding locking block (14) of the abutment block (17).

4. The protection device for preventing overheating of a high-voltage motor according to claim 3, characterized in that: The fixing block (9) has an inclined structure on the side facing the pressure rod (16), so that the pressure rod (16) will be squeezed and lifted when it contacts the fixing block (9).

5. The protection device for preventing overheating of a high-voltage motor according to claim 4, characterized in that: A measuring needle (11) is provided on the side of the fixing block (9) away from the second sliding plate (10), and the measuring needle (11) penetrates and extends out of the protective shell (3).

6. The protection device for preventing overheating of a high-voltage motor according to claim 1, characterized in that: The push rod (5) is connected to the first slide plate (8) via a gear transmission.

7. The protection device for preventing overheating of a high-voltage motor according to claim 6, characterized in that: A gear (7) is rotatably installed inside the protective shell (3), and a rack (6) that meshes with the gear (7) is fixedly connected to the end of the push rod (5), and a drive tooth that meshes with the gear (7) is provided at the bottom of the first slide plate (8).

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