A gas-liquid dual circulation cooling device for a collector ring system

Abstract

The application discloses a gas-liquid double-circulation cooling device for a collector ring system, and mainly relates to the technical field of collector rings. The gas-liquid double-circulation cooling device is improved in view of the problems of existing cooling blind areas, flow field disorder, insufficient heat exchange efficiency, carbon powder accumulation and ring surface failure caused by the carbon powder accumulation in the operation process of the traditional collector ring cooling system. The cooling mode of the gas-liquid double-circulation coupling is adopted, the cooling efficiency can be greatly improved compared with a single cooling mode, the blowing and suction paths of the cooling air flow can be dynamically adjusted along with the rotating state of the collector ring, the operation states of the gas cooling and the water cooling are controlled based on the real-time operation parameters and temperature data of the collector ring in a hierarchical linkage mode, the core heating area of the collector ring is accurately cooled without dead angles in the operation process, the heat exchange efficiency decay problem caused by the rotating ring flow and air flow interference is eliminated, the instant cleaning of the carbon powder generated by friction is simultaneously realized, and the cooling efficiency, working condition adaptability and operation stability in the operation process of the collector ring system are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of slip ring technology, and more specifically to a gas-liquid dual-circulation cooling device for slip ring systems. Background Technology

[0002] The slip ring is a key device in electromechanical equipment that transmits power and signals between the stationary and rotating parts. Technically, it consists of a moving ring (conductor / slip ring) and a stationary ring (brush). The two maintain circuit continuity while sustaining high-speed rotation, as described in the technical content of publication number CN106602376A.

[0003] In the rotation of the stationary and moving rings, high frictional heat generation and frictional damage are inevitable. Therefore, a cooling system rather than a lubrication system is required. This involves using the stationary ring as a base, with air passages in the contact area with the moving ring (to directly remove frictional heat with airflow), or water passages in the non-contact areas (to indirectly remove frictional heat with coolant). Air passages are the primary method, but they also bring the following problems:

[0004] 1. The high-speed rotation of the collector ring will drive the surrounding gas to form a strong rotating circulation, which will counteract the impact force of the counter-purge jet. This will cause the airflow to fail to accurately cover the brush-ring contact working surface, forming a cooling blind zone. In the multi-brush frame layout, the airflow at each purge port will interfere with each other and form turbulence, which will cause local carbon powder to be unable to be effectively removed. At the same time, the convective heat transfer efficiency will be greatly reduced. When the fan speed is adjusted with the load, the fluctuation of the airflow will further aggravate the flow field turbulence.

[0005] 2. Secondly, the flow of ultrafine carbon powder with the airflow has an impact on the stability of the blowing airflow. On the other hand, it can cause a chain of adverse reactions. For example, the stable operation of the collector ring depends on the formation of a uniform and dense metal oxide film on the ring surface. However, carbon powder may damage the oxide film, leading to a sharp increase in local contact resistance, severe local heating, and even the risk of sparks and ring fire.

[0006] Based on the above, this invention proposes a solution. Summary of the Invention

[0007] The purpose of this invention is to provide a gas-liquid dual-circulation cooling device for a current collector ring system, in order to solve the above-mentioned technical problems.

[0008] The objective of this invention can be achieved through the following technical solution: a gas-liquid dual-circulation cooling device for a slip ring system, comprising a brush assembly, a slip ring assembly, a gas pump and a liquid pump, wherein the brush assembly includes a brush head, a semi-air sleeve and a spring assembly, the semi-air sleeve is arranged along both sides of the brush head, and the semi-air sleeve, the brush and the conductive area surface of the slip ring assembly are in contact.

[0009] The semi-air jacket is equipped with multiple sets of limiting ball sleeves and inclined water channels. Correspondingly, a perforated ball is provided in the limiting ball sleeve. An air port is provided on the outside of the limiting ball sleeve, and the limiting ball sleeve serves as the air-cooled end. The two ends of the inclined water channel extend to the outside of the semi-air jacket, and the inclined water channel serves as the water-cooled end.

[0010] The setting is further configured such that the limiting ball sleeves are arranged in a circular array along the center point of the collector ring assembly, and the limiting ball sleeves are arranged in an alternating vertical arrangement along the thickness direction of the semi-air sleeve.

[0011] The configuration is further defined as follows: the porous ball is tangent to the surface of the conductive area of ​​the collector ring assembly, and the porous ball is embedded in the limiting ball sleeve. The porous ball has multiple air channels with corresponding air ports, and each air channel is staggered and connected to the others.

[0012] Further configured as follows: a cooling zone is formed between the semi-gas sleeve and the conductive area surface of the collector ring assembly, the oblique water channel is located in the cooling zone, and the oblique water channel is obliquely staggered relative to the distribution position of the limiting ball sleeve.

[0013] The method is further configured such that the sum of the circumferences of the multiple semi-gas sleeves in a single brush assembly is less than the outer circumference of the slip ring assembly, and an infrared temperature measurement structure is provided at the gap between the multiple semi-gas sleeves.

[0014] Further configuration: During use, cooling water is injected into the inclined water channel by a liquid pump, and cooling gas is injected into the limiting ball sleeve by an air pump through an air port. The injection state of the cooling water is determined by the injection state of the cooling gas, and the injection state of the cooling gas is determined by the rotation state of the slip ring assembly, specifically including the following states:

[0015] The collector ring assembly rotates clockwise: the semi-air sleeves on both sides of the brush head are respectively configured as a positive air suction part and a reverse air blowing part in a clockwise direction;

[0016] The collector ring assembly rotates counterclockwise: the semi-air sleeves on both sides of the brush head are respectively set as the positive air suction part and the reverse air blowing part in the counterclockwise direction.

[0017] Further configuration: In the reverse air blowing section, cooling gas is continuously pumped into the semi-air jacket by an air pump, and the cooling gas flows in a counterclockwise direction in the cooling zone; in the positive air suction section, gas is continuously extracted from the semi-air jacket by an air pump, and the extracted gas is filtered.

[0018] Simultaneously acquire the surface temperature value at the gap of the semi-air jacket and the gas temperature value in the positive air intake section. First, acquire the rotation parameters of the slip ring assembly to adjust the gas flow rate and velocity pumped into the semi-air jacket by the air pump. Then, use the surface temperature value and gas temperature value to adjust the cooling water flow rate and velocity pumped into the inclined water channel by the liquid pump.

[0019] The present invention has the following beneficial effects:

[0020] 1. During operation, the air path design of reverse blowing and forward suction is adapted to the rotation direction of the slip ring. This can accurately counteract the surrounding rotating circulation driven by the high-speed rotation of the slip ring, avoiding the problems of airflow collision and weakening and turbulence caused by multiple airflows interfering with each other in the traditional fixed blowing method. This ensures that the cooling airflow acts stably on the contact working surface between the brush and the slip ring, fundamentally eliminating the cooling blind zone and greatly improving the convective heat transfer efficiency during operation.

[0021] Meanwhile, the continuous purging and suction can promptly blow away the carbon powder generated by the friction of the contact surface during operation and direct it out of the cooling area, avoiding carbon powder accumulation that could damage the metal oxide film on the ring surface. This avoids the operational risks of sudden increase in contact resistance, local overheating, sparks, or even ring fire from the source, significantly improving the safety and reliability of the slip ring system under all operating conditions.

[0022] 2. The key lies in the adoption of a cooling mode that combines air cooling and water cooling. Compared with a single cooling mode, this can significantly improve cooling efficiency. The operation of the cooling water flow is dynamically adjusted according to the operation of the cooling airflow, and the operation of the cooling airflow is dynamically matched with the real-time rotation of the slip ring. It can adapt to the operation requirements of forward and reverse rotation of the slip ring without changing the hardware structure, greatly improving the adaptability and versatility of the device.

[0023] During operation, the flow rate and velocity of the cooling air are first adjusted based on the rotational parameters such as the slip ring speed and load. Then, the flow rate and velocity of the cooling water are adjusted based on the real-time temperature of the slip ring surface and the temperature of the circulating air. This ensures that the cooling capacity is precisely matched with the real-time operating status of the slip ring. This can reduce energy consumption and achieve energy-saving operation under low load conditions, and can also quickly enhance the cooling effect and suppress instantaneous temperature rise under high load or abnormal temperature rise conditions. At the same time, it reduces component wear caused by high-speed friction and overheating, effectively extending the overall service life of the slip ring system. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the slip ring assembly in a gas-liquid dual-circulation cooling device for a slip ring system proposed in this invention;

[0026] Figure 2 In this invention Figure 1 Top view;

[0027] Figure 3 This is a schematic diagram of the brush assembly in this invention;

[0028] Figure 4 For the present invention Figure 3 A cross-sectional view of the middle half of the air jacket;

[0029] Figure 5 This is a schematic diagram of the airflow direction when the collector ring assembly rotates clockwise in this invention;

[0030] Figure 6 This is a schematic diagram of the airflow direction when the collector ring assembly rotates counterclockwise in this invention.

[0031] In the diagram: 1. Brush assembly; 2. Semi-air sleeve; 3. Slip ring assembly; 4. Angled water channel; 5. Perforated ball; 6. Limiting ball sleeve. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: The slip ring system, as the core device for power and signal transmission between the fixed and rotating ends of electromechanical equipment, operates on the following principle: The rotating slip ring assembly (moving ring) and the stationary brush assembly (stationary ring) maintain continuous circuit conduction under high-speed rotation conditions through sliding contact. During operation, frictional heat is continuously generated at the contact surface between the moving and stationary rings, requiring a cooling system to cool the core heat-generating area. Conventional mainstream cooling solutions are divided into two categories: independent air cooling and independent water cooling. Independent air cooling directly removes frictional heat through convection heat transfer by blowing cooling airflow onto the contact surface; independent water cooling indirectly achieves heat transfer and cooling by setting cooling water channels within the brush holder.

[0034] However, a single cooling solution has unresolved core technical defects in actual high-speed and heavy-load operation: First, in the independent air-cooling solution, the high-speed rotation of the slip ring will drive the surrounding gas to form a strong rotating circulation, which will offset the impact of the purging airflow. This will cause the airflow to fail to accurately cover the brush-slip ring contact surface, forming a cooling blind zone. In addition, in the multi-brush layout, the airflow at each purging port will interfere with each other and form turbulence, which will not only significantly reduce the convective heat transfer efficiency, but also fail to effectively remove the ultrafine carbon powder generated on the contact surface. Carbon powder accumulation will destroy the uniform and dense metal oxide film on the ring surface, causing a sudden increase in local contact resistance, overheating, sparking, or even ring fire failure. Second, the independent water-cooling solution is an indirect heat exchange solution and cannot directly act on the core contact surface that generates frictional heat. The cooling response is lagging and cannot cope with the instantaneous temperature rise caused by load fluctuations. It cannot meet the cooling requirements of the high-speed and heavy-load slip ring system when used alone.

[0035] To address this issue, this invention proposes a dual-circulation air-liquid cooling device for a slip ring system. Specifically, it overcomes the limitations of traditional independent air cooling and independent water cooling technologies by coupling and integrating direct air cooling and indirect water cooling into the matching structure of the brush assembly. Simultaneously, it adapts to the forward and reverse rotation of the slip ring, dynamically adjusting the airflow path to achieve precise, efficient, and full-condition cooling of the core heat-generating area. This also solves the problems of toner cleaning and dynamic temperature rise control. Details are as follows:

[0036] Reference Figures 1-6 Based on a brush assembly 1, a slip ring assembly 3, an air pump, and a liquid pump, the brush assembly 1 includes a brush head, a semi-air sleeve 2, and a spring assembly. The semi-air sleeve 2 is arranged along both sides of the brush head and maintains contact with the conductive area surface of the slip ring assembly 3. The semi-air sleeve 2 integrates an air-cooled end with a limiting ball sleeve 6 and a porous rolling ball 5 as its core, and a water-cooled end with an inclined water channel 4 as its core. Through the coordinated and graded control of the air pump and the liquid pump, the linkage adjustment of air cooling and water cooling is realized, fundamentally eliminating the problems of cooling blind spots, flow field turbulence, and cooling lag in traditional cooling solutions, and comprehensively improving the cooling efficiency and operational stability of the slip ring system.

[0037] Example 2: The complete operation process of the gas-liquid dual-circulation cooling device for this slip ring system is described in detail below, based on relevant technical features:

[0038] Reference Figure 1 Adaptive assembly is required because the specific structure of the slip ring is not uniform. Therefore, this invention is based only on a cylindrical moving ring (slip ring) and configured with brushes (stationary rings). The slip ring needs to be kept rotating while the brushes remain stationary.

[0039] After assembly, the brush assembly 1 uses a spring assembly to press the brush head and the semi-air sleeve 2 onto the conductive area surface of the slip ring assembly 3, ensuring that the semi-air sleeve 2, the brush, and the conductive area surface of the slip ring assembly 3 remain in close contact during operation. This ensures a stable current path and creates a closed cooling zone between the semi-air sleeve 2 and the conductive area surface of the slip ring assembly 3, providing a stable spatial basis for the precise action of the cooling medium.

[0040] The sum of the circumferences of the multiple semi-air sleeves 2 in a single brush assembly 1 is less than the outer circumference of the slip ring assembly 3. An infrared temperature measurement structure is set in the gap between the multiple semi-air sleeves 2. This layout not only ensures that the cooling structure fully covers the core heat-generating area, but also reserves non-interference temperature monitoring points, which can collect the real temperature data of the slip ring assembly 3 ring surface in real time, providing a precise basis for the dynamic adjustment of cooling parameters. It should be added that: because the slip ring is in a high current state, conventional contact temperature measurement methods may produce problems such as data distortion. Therefore, this invention mainly uses non-contact infrared temperature measurement.

[0041] After the collector ring assembly 3 starts to rotate, the air-cooled end and the water-cooled end start to run synchronously. Multiple sets of limiting ball sleeves 6 are arranged in a ring array along the center of the collector ring assembly 3 and staggered up and down along the thickness direction of the semi-air sleeve 2. The porous rolling balls 5 embedded in them are kept tangent to the surface of the conductive area of ​​the collector ring assembly 3. The friction generated by the rotation of the ring surface drives the porous rolling balls 5 to rotate freely synchronously in the limiting ball sleeves 6. Without considering the frictional damage between the brush and the collector ring;

[0042] On the one hand, the rolling contact of the porous ball 5 replaces the sliding friction of the traditional structure, which greatly reduces the friction loss of the contact surface and avoids the risk of damage to the metal oxide film on the ring surface during the process of the porous ball 5 and the slip ring base. It can also improve the contact stability between the semi-air sleeve 2 and the slip ring. On the other hand, the air pump pumps cooling gas into the interior of the limiting ball sleeve 6 through the air port outside the sleeve. The cooling gas is ejected through multiple sets of interconnected air channels inside the porous ball 5. The interconnected air channel structure makes the cooling gas form multiple turbulent jets. With the continuous rotation of the porous ball 5, the jet can dynamically change the spray angle with the rotation of the ball, covering the contact working surface of the brush and the slip ring assembly 3 without dead angles, eliminating the cooling blind zone present in the traditional fixed blow port. At the same time, the continuous jet airflow can blow away the small amount of carbon powder generated on the contact surface in time, preventing carbon powder from accumulating in the cooling zone.

[0043] In the synchronously operating water-cooled end, the inclined water channel 4, which is connected to the liquid pump, is set in the cooling zone and is arranged in an oblique staggered manner relative to the distribution position of the limiting ball sleeve 6. The two ends of the inclined water channel 4 extend to the outside of the semi-air jacket 2 to form a complete water circulation loop. When the liquid pump drives the cooling water to flow through the inclined water channel 4, it can directly and synchronously cool the entire semi-air jacket 2 and the airflow in the cooling zone: on the one hand, through the heat conduction of the semi-air jacket 2, indirect heat exchange is carried out on the contact working surface between the brush and the ring surface, which makes up for the cooling lag problem of air cooling when the load increases instantaneously and achieves rapid suppression of instantaneous temperature rise; on the other hand, it can simultaneously reduce the inlet temperature of the air cooling circulation, further improve the convective heat transfer efficiency of the air-cooled end, realize the synergistic effect of air cooling and water cooling, and solve the efficiency shortcomings of the traditional independent cooling scheme.

[0044] Example 3: This example is a supplementary explanation of Examples 1 and 2, focusing on the air blowing method that differs from the conventional air-cooling mode;

[0045] This device can dynamically adjust the cooling gas injection mode according to the rotation state of the slip ring assembly 3 to adapt to the cooling requirements of forward and reverse rotation conditions: when the slip ring assembly 3 rotates clockwise, the half-air sleeves 2 on both sides of the brush head are respectively set as the positive air suction part and the reverse air blowing part in the clockwise direction; when the slip ring assembly 3 rotates counterclockwise, the half-air sleeves 2 on both sides of the brush head are respectively set as the positive air suction part and the reverse air blowing part in the counterclockwise direction.

[0046] Reference Figure 5 and Figure 6 In the reverse air blowing section, the air pump continuously pumps cooling gas into the semi-air jacket 2, causing the cooling gas to form an airflow in the cooling zone that is opposite to the rotation direction of the slip ring assembly 3. The reverse airflow can accurately counteract the rotating circulation driven by the high-speed rotation of the slip ring, avoiding the weakening of the sweeping jet by the circulation, and ensuring that the cooling airflow can act stably and accurately on the contact working surface. Simultaneously, in the positive air suction section, the air pump continuously extracts the gas in the semi-air jacket 2 to form a negative pressure suction effect. This can not only extract the carbon powder and hot airflow blown up by the reverse air blowing section out of the cooling zone in time, avoiding carbon powder retention, but also prevent the airflow of multiple brush assemblies 1 from interfering with each other and forming turbulence, ensuring the stability of the flow field in the cooling zone, but also allow the extracted gas to be filtered and then sent back to the air pump for recycling, reducing the operating energy consumption of the device.

[0047] Secondly, a hierarchical linkage control logic can be added by adding an external controller. The injection state of cooling water is determined by the injection state of cooling gas, and the injection state of cooling gas is determined by the rotation state of the slip ring assembly 3, so as to achieve adaptive adjustment under all working conditions.

[0048] During operation, the system first acquires rotational parameters such as the rotation direction, speed, and load power of the slip ring assembly 3 in real time. Based on these parameters, it adjusts the gas flow rate and velocity pumped into the semi-air jacket 2 by the air pump to precisely match the purging force of the cooling airflow with the rotational state of the slip ring. This reduces the air pump power to achieve energy saving under low-speed, low-load conditions and increases the airflow to ensure cooling performance under high-speed, high-load conditions. Simultaneously, it acquires the surface temperature of the slip ring assembly 3 through an infrared temperature measurement structure at the gap of the semi-air jacket 2 and the temperature of the extracted gas through the gas circuit of the positive air suction section. Based on these two sets of temperature data, it adjusts the flow rate and velocity of the cooling water injected into the inclined water channel 4 by the liquid pump. When the surface temperature of the ring and the temperature of the extracted gas rise abnormally, it promptly increases the cooling water flow rate to enhance the heat exchange effect of the water-cooled end, complementing the air-cooled end and quickly suppressing the surface temperature rise. This prevents local overheating, arcing, and other faults, ensuring the safe and stable operation of the slip ring system across all operating conditions.

[0049] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A gas-liquid dual-circulation cooling device for a slip ring system, comprising a brush assembly (1), a slip ring assembly (3), a gas pump, and a liquid pump, characterized in that, The brush assembly (1) includes a brush head, a semi-air sleeve (2) and a spring assembly. The semi-air sleeve (2) is arranged along both sides of the brush head, and the semi-air sleeve (2), the brush and the conductive area surface of the collector ring assembly (3) are in contact. The semi-air jacket (2) is equipped with multiple sets of limiting ball sleeves (6) and inclined water channels (4). Correspondingly, a perforated ball (5) is provided in the limiting ball sleeve (6). An air port is provided on the outside of the limiting ball sleeve (6), and the limiting ball sleeve (6) serves as the air-cooled end. The two ends of the inclined water channel (4) extend to the outside of the semi-air jacket (2), and the inclined water channel (4) serves as the water-cooled end.

2. The gas-liquid dual-circulation cooling device for a slip ring system according to claim 1, characterized in that, The limiting ball sleeves (6) are arranged in a ring array along the center point of the collector ring assembly (3), and the limiting ball sleeves (6) are arranged alternately up and down along the thickness direction of the semi-air sleeve (2).

3. The gas-liquid dual-circulation cooling device for a slip ring system according to claim 2, characterized in that, The porous ball (5) is tangent to the conductive area surface of the collector ring assembly (3), and the porous ball (5) is embedded in the limiting ball sleeve (6). The porous ball (5) has multiple air passages with corresponding air ports, and each air passage is staggered and connected.

4. The gas-liquid dual-circulation cooling device for a slip ring system according to claim 3, characterized in that, A cooling zone is formed between the semi-air sleeve (2) and the conductive area surface of the collector ring assembly (3). The oblique water channel (4) is located in the cooling zone, and the oblique water channel (4) is obliquely staggered relative to the distribution position of the limiting ball sleeve (6).

5. The gas-liquid dual-circulation cooling device for a slip ring system according to claim 4, characterized in that, The sum of the circumferences of the multiple semi-air sleeves (2) in a single brush assembly (1) is less than the outer circumference of the slip ring assembly (3), and an infrared temperature measurement structure is provided at the gap between the multiple semi-air sleeves (2).

6. The gas-liquid dual-circulation cooling device for a slip ring system according to claim 5, characterized in that, During use, cooling water is injected into the inclined water channel (4) by the liquid pump, and cooling gas is injected into the limiting ball sleeve (6) by the air pump through the air port. The injection state of the cooling water is determined by the injection state of the cooling gas, and the injection state of the cooling gas is determined by the rotation state of the slip ring assembly, specifically including the following states: The collector ring assembly (3) rotates clockwise: the half-air sleeves (2) on both sides of the brush head are respectively set as the positive air suction part and the reverse air blowing part in the clockwise direction; The collector ring assembly (3) rotates counterclockwise: the half-air sleeves (2) on both sides of the brush head are respectively set as the positive air suction part and the reverse air blowing part in the counterclockwise direction.

7. A gas-liquid dual-circulation cooling device for a slip ring system according to claim 6, characterized in that, In the reverse air blowing section, cooling gas is continuously pumped into the semi-air jacket (2) by an air pump, and the cooling gas flows in a counterclockwise direction in the cooling zone; in the positive air suction section, gas is continuously extracted from the semi-air jacket (2) by an air pump, and the extracted gas is filtered. Simultaneously acquire the surface temperature value at the gap of the semi-air jacket (2) and the gas temperature value in the positive gas suction part. First, acquire the rotation parameters of the collector ring assembly (3) to adjust the gas flow rate and velocity pumped into the semi-air jacket (2) by the air pump. Then, use the surface temperature value and gas temperature value to adjust the cooling water flow rate and velocity pumped into the inclined water channel (4) by the liquid pump.

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