Carbon brush device for adjusting tail end pressure through temperature negative correlation

Abstract

The embodiment of the invention provides a carbon brush device for adjusting tail end pressure through temperature negative correlation, and relates to the technical field of generator equipment, and the carbon brush device comprises a carbon brush body and a rear end pressure assembly. The rear end pressure assembly is connected to the rear end of the carbon brush body and is used for providing pressure pointing to the direction of a commutator / a collector ring for the carbon brush body; wherein the rear end pressure assembly comprises a spring assembly and a thermoplastic elastomer which are connected in series; the thermoplastic elastomer is connected with the rear end of the carbon brush body. The device can solve the problem that in the prior art, the pressure of the carbon brush is fixed and cannot adapt to temperature change, and equipment operation faults occur frequently.

Description

Technical Field

[0001] This application relates to the field of generator equipment technology, and more specifically, to a carbon brush device for adjusting the terminal pressure in a temperature-negative correlation manner. Background Technology

[0002] As a key component in rotating electrical equipment such as motors and generators, carbon brushes are crucial for the transmission of current between stationary and rotating parts. The contact pressure between the carbon brush and the slip ring is essential for the normal operation of the equipment. In existing technologies, carbon brushes typically use a constant force spring to directly provide a fixed end pressure to ensure reliable contact between the carbon brush and the slip ring.

[0003] When electrical equipment is running, the carbon brush with a fixed pressure generates heat due to friction between the brush and the slip ring. As the equipment operates, the temperature gradually increases. This leads to several problems: 1. Increased temperature causes changes in the material properties of the carbon brush and slip ring, potentially damaging them. 2. The fixed contact pressure cannot accommodate thermal deformation of the materials and may create a cycle of "increased temperature - increased friction - further temperature increase." 3. Because generator carbon brushes use a multi-parallel structure, the contact resistance is inversely proportional to the current distribution. Brushes that overheat generally have a large current shunting, and the constant force structure cannot improve the overheating situation. Overheating of the carbon brush can lead to sparking, slip ring erosion, and other malfunctions, severely affecting the reliability and lifespan of the equipment.

[0004] Currently, there are few solutions in the industry for adjusting carbon brush pressure. Some solutions attempt to adjust the pressure by manually adjusting the spring pressure or by using complex electronic control devices. However, manual adjustment cannot respond to temperature changes in real time and is cumbersome to operate. Electronic control devices, on the other hand, have problems such as complex structure, high cost, and susceptibility to electrical interference, making them difficult to widely apply in various electrical equipment. Summary of the Invention

[0005] The embodiments of this application provide a carbon brush device that adjusts the end pressure in a temperature-negative correlation manner to solve the problem in the prior art where the fixed carbon brush pressure cannot adapt to temperature changes, leading to frequent equipment malfunctions.

[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0007] According to a first aspect of the embodiments of this application, a carbon brush device for adjusting the end pressure based on temperature negative correlation is provided, comprising: Carbon brush body and back-end pressure assembly; The rear pressure assembly is connected to the rear end of the carbon brush body and is used to provide pressure to the carbon brush body in the direction of the commutator / slip ring. The rear pressure assembly includes a spring assembly and a thermoplastic elastomer connected in series. The thermoplastic elastomer is connected to the rear end of the carbon brush body.

[0008] In some embodiments of this application, based on the foregoing scheme, the backend pressure component further includes: Conductor connectors and support bases; One end of the support base is mounted on the conductor connector, and the other end is connected to the spring assembly.

[0009] In some embodiments of this application, based on the foregoing scheme, the carbon brush body includes: Carbon brushes and carbon brush holders; One end of the carbon brush is fixedly mounted on the carbon brush base; The other end of the carbon brush base has a mounting hole for installing the thermoplastic elastomer.

[0010] In some embodiments of this application, based on the foregoing scheme, the thermoplastic elastomer adopts a cylindrical structure, with one end fixed in the fixing and mounting hole.

[0011] In some embodiments of this application, based on the foregoing scheme, the spring assembly includes: Main spring and auxiliary spring; One end of the main spring is connected to the thermoplastic elastomer, and the other end is connected to the support base; One end of the auxiliary spring is connected to the carbon brush base, and the other end is connected to the support base.

[0012] In some embodiments of this application, based on the foregoing scheme, first cylindrical spring support columns are provided at the four corner edges of the support base; The carbon brush base is provided with second cylindrical spring support columns at the four corner edges; One end of the auxiliary spring is connected to the first cylindrical spring support column, and the other end is connected to the second cylindrical spring support column.

[0013] In some embodiments of this application, based on the foregoing scheme, an annular groove is provided at the other end of the thermoplastic elastomer; A spring fixing mounting hole is provided in the middle of the other end of the support base; One end of the main spring is connected to the annular groove, and the other end is connected to the spring fixing hole.

[0014] In some embodiments of this application, based on the foregoing scheme, the following further methods are also included: Flexible wires used to form conductive paths; One end of the flexible wire is connected to the conductor connector, and the other end is connected to the carbon brush.

[0015] In some embodiments of this application, based on the foregoing scheme, the conductor connector is made of a conductive metal material.

[0016] In some embodiments of this application, based on the foregoing scheme, the conductor connector is provided with a mounting slot and a wire mounting hole.

[0017] The technical solution of this application has the following beneficial effects: 1. Achieve negative automatic pressure adjustment based on carbon brush temperature: Through the series connection structure of spring and TPE component, the negative adjustment of carbon brush end pressure as temperature rises can be achieved without additional electronic control device or manual operation, automatically adapting to temperature changes.

[0018] 2. Improve equipment operational reliability: By dynamically adjusting the contact pressure, the risk of overheating damage to carbon brushes and slip rings caused by temperature rise is effectively reduced, extending the service life of components. At the same time, it ensures stable contact resistance, thereby improving the operational reliability and stability of generators and other equipment.

[0019] 3. Simple structure and low cost: The present invention has a simple structure, does not require a complex mechanical transmission or electronic control system, has low material and manufacturing costs, and is easy to mass-produce and promote application.

[0020] 4. High adaptability: The pressure can be adjusted according to the working temperature range and pressure requirements of different equipment by selecting TPE materials with different elastic coefficients and springs with different elastic coefficients. It is suitable for various electrical equipment with different power and working environment.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 A schematic diagram of a carbon brush device for adjusting end pressure based on a temperature negative correlation according to an embodiment of this application is shown. Figure 2 An exploded view of the structure of a carbon brush device for adjusting end pressure with temperature negative correlation according to an embodiment of this application is shown. Figure 3 A schematic diagram of a support base according to an embodiment of this application is shown.

[0023] Explanation of reference numerals in the attached figures 1-Carbon brush; 2-Carbon brush base; 3-Thermoplastic elastomer; 4-Auxiliary spring; 5-Main spring; 6-Flexible wire; 7-Support base; 8-Conductor connector. Detailed Implementation

[0024] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0025] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0026] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0029] The following detailed description of some embodiments of this application will be provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] To address the technical problems existing in the prior art, this application provides a carbon brush device for adjusting the end pressure based on temperature negative correlation, comprising: Carbon brush body and back-end pressure assembly; The rear pressure assembly is connected to the rear end of the carbon brush body and is used to provide pressure to the carbon brush body in the direction of the commutator / slip ring. The rear pressure assembly includes a spring assembly and a thermoplastic elastomer connected in series. The thermoplastic elastomer is connected to the rear end of the carbon brush body.

[0031] It should be noted that the thermoplastic elastomer has the characteristic that its elasticity decreases as the temperature increases, and it is made of thermoplastic elastomer materials, such as styrene-based S-TPE or polyolefins.

[0032] It should be noted that in this device, the spring assembly and the thermoplastic elastomer are connected in series along the axial direction of the carbon brush body, forming a transmission path of "spring-thermoplastic elastomer-carbon brush body". Under the initial normal temperature condition, the elastic force corresponding to the compression of the spring is transmitted to the carbon brush body through the thermoplastic elastomer, forming the initial contact pressure at the end of the carbon brush. When the temperature rises, the elasticity of the thermoplastic elastomer decreases with the temperature increase, which in turn leads to a decrease in the contact pressure transmitted to the end of the carbon brush body, realizing negative pressure adjustment.

[0033] In some feasible embodiments, based on the foregoing scheme, the carbon brush body includes: Carbon brushes and carbon brush holders; One end of the carbon brush is fixedly mounted on the carbon brush base; The other end of the carbon brush base has a mounting hole for installing the thermoplastic elastomer.

[0034] For example, see Figure 1 The diagram shows a schematic of a carbon brush device for adjusting end pressure based on a temperature negative correlation according to an embodiment of this application.

[0035] See Figure 2 The diagram shows an exploded view of a carbon brush device for adjusting end pressure in a temperature-negative correlation according to an embodiment of this application.

[0036] like Figure 1 and Figure 2As shown, carbon brush 1 is a sliding contact connector with the slip ring and is made of graphite-based carbon brush material. One end of carbon brush 1 is fixed on carbon brush base 2. Carbon brush base 2 is made of metal material with high thermal conductivity. The other end of carbon brush base 2 is provided with a fixing hole in the middle, and cylindrical springs made of insulating material are provided at the four corner edges.

[0037] In some feasible embodiments, based on the aforementioned scheme, the thermoplastic elastomer adopts a cylindrical structure, with one end fixed in the fixing and mounting hole.

[0038] For example, such as Figure 2 As shown, the thermoplastic elastomer 3 has a cylindrical structure, with one end fixed in the mounting hole of the carbon brush base 2, and the other end having an annular groove that is fixedly connected to one end of the main spring 5.

[0039] In some feasible embodiments, based on the foregoing scheme, the backend pressure component further includes: Conductor connectors and support bases; One end of the support base is mounted on the conductor connector, and the other end is connected to the spring assembly.

[0040] For example, such as Figure 1 , Figure 2 As shown, one end of the support base 7 is connected to the main spring 5 and the auxiliary spring 4, and the other end is connected to the conductor connector 8.

[0041] In some feasible embodiments, based on the foregoing scheme, the spring assembly includes: Main spring and auxiliary spring; One end of the main spring is connected to the thermoplastic elastomer, and the other end is connected to the support base; One end of the auxiliary spring is connected to the carbon brush base, and the other end is connected to the support base.

[0042] It should be noted that the auxiliary spring is used to maintain pressure balance on the carbon brush end face.

[0043] For example, such as Figure 1 and Figure 2 As shown, four auxiliary springs 4 are provided on the outside of the main spring 5, and the four auxiliary springs 4 are evenly arranged around the main spring 5.

[0044] In some feasible embodiments, based on the aforementioned scheme, first cylindrical spring support columns are provided at the four corner edges of the support base; The carbon brush base is provided with second cylindrical spring support columns at the four corner edges; One end of the auxiliary spring is connected to the first cylindrical spring support column, and the other end is connected to the second cylindrical spring support column.

[0045] For example, such as Figure 2 As shown, cylindrical spring support columns are provided at the four corners of the carbon brush base 2 and the support base 7. Four auxiliary springs 4 are installed on the cylindrical spring support columns on the carbon brush base 2 and the support base 7 to maintain the pressure balance of the carbon brush end face.

[0046] In some feasible embodiments, based on the foregoing scheme, an annular groove is provided at the other end of the thermoplastic elastomer; A spring fixing mounting hole is provided in the middle of the other end of the support base; One end of the main spring is connected to the annular groove, and the other end is connected to the spring fixing hole.

[0047] For example, see Figure 3 The diagram shows a schematic of a support base according to an embodiment of this application.

[0048] like Figure 2 As shown, the thermoplastic elastomer 3 has an annular groove, such as... Figure 3 As shown, a spring mounting hole is provided in the middle of the support base 7. One end of the main spring 5 is connected to the annular groove, and the other end is connected to the spring mounting hole.

[0049] In some feasible embodiments, based on the foregoing scheme, the following further applies: Flexible wires used to form conductive paths; One end of the flexible wire is connected to the conductor connector, and the other end is connected to the carbon brush.

[0050] For example, such as Figure 1 , Figure 2 As shown, the flexible conductor 6 is a flexible conductor composed of multiple layers of thin copper sheets, which connects the conductor connector 8 and the carbon brush 1 to form a conductive path.

[0051] In some feasible embodiments, based on the foregoing scheme, the conductor connector is made of a conductive metal material.

[0052] In some feasible embodiments, based on the aforementioned scheme, the conductor connector is provided with a mounting slot and a wire mounting hole.

[0053] The carbon brush of the present invention, which adjusts the end pressure in a temperature-negative correlation manner, achieves its pressure adjustment process based on the synergistic effect of the elastic properties of thermoplastic elastic materials and the elastic force changes of springs. The specific working principle is as follows: 1. When the equipment is in a normal temperature environment or has just been started, the temperature is low and the thermoplastic elastomer has a large elasticity. At this time, the spring is in a preset compression state. The elastic force of the spring connected in series with the thermoplastic elastomer is transmitted to the carbon brush body, so that the end of the carbon brush body is in close contact with the slip ring with the initial pressure, ensuring stable current transmission.

[0054] 2. When the temperature rises, as the equipment runs for longer, the friction between the carbon brush body and the slip ring, as well as the heat generated by the current on the resistor, cause the carbon brush temperature to rise. After the temperature is transferred to the thermoplastic elastomer, the elasticity of the thermoplastic elastomer decreases with the increase of temperature. The reduced elasticity of the thermoplastic elastomer leads to a decrease in the contact pressure transmitted to the end of the carbon brush body.

[0055] 3. Contact resistance adjustment: As the pressure at the end of the carbon brush decreases, the tightness of the contact between the carbon brush and the slip ring changes adaptively, and the contact resistance between the carbon brush and the slip ring increases. After the contact resistance increases, the current flowing through this carbon brush decreases, thereby reducing the generation of heat and allowing the carbon brush temperature to gradually return to normal.

[0056] 4. Temperature recovery after cooling: When the current flowing through the carbon brush decreases, the carbon brush temperature decreases, the elasticity of the thermoplastic elastomer increases, and the spring and thermoplastic elastomer keep the carbon brush body in reliable contact with the slip ring, thereby ensuring the temperature balance on each carbon brush.

[0057] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A carbon brush device for adjusting end pressure based on temperature negative correlation, characterized in that, include: Carbon brush body and back-end pressure assembly; The rear pressure assembly is connected to the rear end of the carbon brush body and is used to provide pressure to the carbon brush body in the direction of the commutator / slip ring. The rear pressure assembly includes a spring assembly and a thermoplastic elastomer connected in series. The thermoplastic elastomer is connected to the rear end of the carbon brush body.

2. The apparatus according to claim 1, characterized in that, The backend pressure component also includes: Conductor connectors and support bases; One end of the support base is mounted on the conductor connector, and the other end is connected to the spring assembly.

3. The apparatus according to claim 2, characterized in that, The carbon brush body includes: Carbon brushes and carbon brush holders; One end of the carbon brush is fixedly mounted on the carbon brush base; The other end of the carbon brush base has a mounting hole for installing the thermoplastic elastomer.

4. The apparatus according to claim 3, characterized in that, The thermoplastic elastomer has a cylindrical structure, with one end fixed inside the mounting hole.

5. The apparatus according to claim 4, characterized in that, The spring assembly includes: Main spring and auxiliary spring; One end of the main spring is connected to the thermoplastic elastomer, and the other end is connected to the support base; One end of the auxiliary spring is connected to the carbon brush base, and the other end is connected to the support base.

6. The apparatus according to claim 5, characterized in that, The support base is provided with first cylindrical spring support columns at the four corner edges; The carbon brush base is provided with second cylindrical spring support columns at the four corner edges; One end of the auxiliary spring is connected to the first cylindrical spring support column, and the other end is connected to the second cylindrical spring support column.

7. The apparatus according to claim 5, characterized in that, The other end of the thermoplastic elastomer is provided with an annular groove; A spring fixing mounting hole is provided in the middle of the other end of the support base; One end of the main spring is connected to the annular groove, and the other end is connected to the spring fixing hole.

8. The apparatus according to any one of claims 3-7, characterized in that, Also includes: Flexible wires used to form conductive paths; One end of the flexible wire is connected to the conductor connector, and the other end is connected to the carbon brush.

9. The apparatus according to claim 8, characterized in that, The conductor connector is made of a conductive metal material.

10. The apparatus according to claim 9, characterized in that, The conductor connector is provided with mounting slots and wire mounting holes.

Images