Contact arm for efficient heat dissipation type circuit breaker

Abstract

The utility model relates to the technical field of electric appliance accessories, and discloses a contact arm for a high-efficiency heat dissipation type circuit breaker, which comprises a contact arm cylinder body, a heat dissipation opening is arranged on the contact arm cylinder body, a heat dissipation cylinder body is coaxially arranged on the contact arm cylinder body, a heat dissipation cavity is arranged between the heat dissipation cylinder body and the contact arm cylinder body, and flowing gas is introduced into the heat dissipation cavity. Two or more drainage plates are arranged on the inner wall of the heat dissipation barrel in the circumferential direction of the heat dissipation barrel, the section of each drainage plate is in a funnel shape, the drainage plates are arranged above the heat dissipation openings, flowing gas can be gathered into the drainage plates through the drainage plates, the flowing speed of fluid is increased, and due to the fact that the pressure intensity of the fluid in the flow plates is smaller than that of surrounding gas, the flow speed of the fluid is increased. When flowing gas passes through the drainage plate, hot gas in the heat dissipation opening below the drainage plate is pressed into the drainage plate and flows out along with the flowing gas, the design of reducing fluid pressure can effectively prevent the hot gas from being accumulated in the contact arm cylinder, and therefore the heat dissipation effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical accessories, in particular to a contact arm for a high-efficiency heat dissipation type circuit breaker. Background Art

[0002] The contact arm for circuit breakers is one of the key components in electrical engineering and plays an important role in the circuit. The contact arm is usually made of conductive materials, and its design and operation enable it to move inside the circuit breaker and reliably contact or separate the contacts when necessary. This construction allows the contact arm to control the current and disconnect or connect the circuit. In electrical systems, the contact arms for circuit breakers are widely used. First, they are used to protect circuits from damage caused by overload or short circuit. When the circuit load exceeds the rated value or a short circuit occurs, the contact arm can quickly and accurately cut off the current to prevent fire or equipment damage. Secondly, the contact arm for circuit breakers is also used to control the circuit. Whether it is manually operated or used in conjunction with an automated system, the contact arm can achieve precise control of the circuit on and off to ensure the normal flow or cutoff of the current. In addition, the contact arm also provides convenience for maintenance and repair. Electrical engineers can safely perform equipment maintenance and repair by controlling the position of the contact arm. An important advantage of using contact arms for circuit breakers is their performance in safety, reliability and operability. From a safety perspective, they can quickly cut off circuits, reduce the risk of fire and equipment damage, and protect personnel and equipment. In terms of reliability, the contact arm is precisely designed to reliably open or close the circuit to ensure the normal flow of current. In terms of operability, the design of the circuit breaker contact arm makes operation more convenient, and can also be used in conjunction with the automation system to achieve intelligent control of the circuit. As an important part of the electrical system, the circuit breaker contact arm provides indispensable support for circuit protection, control, and equipment maintenance through its precise control function, safety, and reliability, ensuring the safe operation and stability of electrical equipment.

[0003] However, during the use of the existing circuit breaker contact arm, a large amount of heat will be generated due to the passage of current and other effects. This heat is mainly concentrated in the arc extinguishing chamber and the contact arm itself. Overheating will affect the performance and service life of the contact arm. In severe cases, it may even cause the contact arm to melt or burn, causing a safety accident. In order to solve this problem, the existing heat dissipation structure usually adds a multi-layer heat sink structure to the contact arm. However, this design has some problems. Due to the multi-layer setting of the heat sink, the air circulation speed around the contact arm is slowed down, and the hot air cannot be discharged in time, resulting in poor heat dissipation performance. Another common heat dissipation method is to add a fan. Although this method can reduce the temperature of the contact arm surface, it cannot effectively dissipate the air inside the contact arm. Since the air temperature in the contact arm cannot be quickly reduced, this will have an adverse effect on the use of the contact arm and the internal structure, further aggravating the problem of overheating. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a contact arm for an efficient heat dissipation type circuit breaker, which has the advantages of being able to quickly cool the contact arm cylinder and being able to extract the high-temperature gas in the contact arm to reduce the gas temperature inside the contact arm. It solves the problem that the existing heat sink slows down the air circulation speed around the contact arm, the hot air cannot be discharged in time, and the air temperature in the contact arm cannot be quickly reduced, resulting in poor heat dissipation performance and potential safety hazards.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of being able to quickly cool down the contact arm cylinder and being able to extract the high-temperature gas in the contact arm to reduce the temperature of the gas inside the contact arm, the utility model provides the following technical solutions: a contact arm for a high-efficiency heat dissipation type circuit breaker, comprising a contact arm cylinder, the contact arm cylinder is provided with two or more heat dissipation ports, a heat dissipation cylinder is coaxially mounted on the contact arm cylinder, the heat dissipation cylinder has a diameter greater than the diameter of the contact arm cylinder, a heat dissipation cavity is provided between the heat dissipation cylinder and the contact arm cylinder, flowing gas is passed into the heat dissipation cavity, the inner wall of the heat dissipation cylinder is provided with two or more guide plates along its circumferential direction, the guide plate guides along the air flow direction in the heat dissipation cavity, the guide plate has a funnel-shaped cross-section, and the guide plate is arranged above the heat dissipation port.

[0008] Preferably, the inner wall of the heat dissipation cylinder is further provided with heat dissipation fins along its circumferential direction, the heat dissipation fins contact the outer wall of the contact arm cylinder at one end away from the heat dissipation cylinder, and the heat dissipation fins are installed along the air flow direction in the heat dissipation cavity.

[0009] Preferably, a connecting ring is fixedly mounted on the left end surface of the contact arm cylinder.

[0010] Preferably, a mounting wall is fixedly mounted on the right end surface of the contact arm, two or more positioning holes are arranged on the mounting wall along its circumferential direction, and a connecting hole is coaxially arranged at the center of the mounting wall.

[0011] Preferably, the heat dissipation cylinder is made of insulating heat-conducting material, an air inlet is arranged at the left end of the heat dissipation cylinder, and an air outlet is arranged at the right end of the heat dissipation cylinder.

[0012] Preferably, the narrowest width of the guide plate is equal to the width of the heat dissipation port.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model provides a contact arm for a high-efficiency heat dissipation type circuit breaker, which has the following beneficial effects:

[0015] 1. This contact arm for a high-efficiency heat dissipation circuit breaker uses a guide plate structure in conjunction with a heat dissipation cylinder structure. Compared with the traditional technical structure, the funnel shape of the guide plate in this structure can gather the flowing gas into the guide plate and increase the flow rate of the fluid. The increase in flow rate helps to bring the hot gas out of the heat dissipation cylinder and improve the heat dissipation efficiency. At the same time, since the fluid pressure in the flow plate is lower than the pressure of the surrounding gas, when the flowing gas passes through the guide plate, it will press the hot gas in the heat dissipation port below the guide plate into the guide plate and flow out with the flowing gas. This design of reducing fluid pressure can effectively prevent the accumulation of hot gas inside the contact arm cylinder, thereby improving the heat dissipation effect.

[0016] 2. This contact arm for a high-efficiency heat-dissipating circuit breaker uses a heat-dissipating fin structure in conjunction with a heat-dissipating cylinder structure. Compared with the traditional technical structure, the heat-dissipating fins in this structure can significantly increase the surface area in contact with the surrounding air, thereby enhancing the efficiency of heat exchange. In this way, the heat-dissipating fins can transfer the heat generated inside the cylinder to the outside air more quickly. When the air flows along the direction in which the heat-dissipating fins are arranged, it can take away the heat absorbed by the heat-dissipating fins. This design utilizes the flow of air to enhance the convection effect and further accelerates the heat dissipation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the left three-dimensional structure of a contact arm for a high-efficiency heat dissipation type circuit breaker of the utility model;

[0018] Figure 2 It is a schematic diagram of the right three-dimensional structure of a contact arm for a high-efficiency heat dissipation type circuit breaker of the utility model;

[0019] Figure 3 This is a structural cross-sectional view of a contact arm for a high-efficiency heat dissipation type circuit breaker of the utility model;

[0020] Figure 4 This is a partial structural cross-sectional view of a contact arm for a high-efficiency heat dissipation type circuit breaker of the utility model;

[0021] Figure 5 The utility model is a cross-sectional view of a guide plate structure of a contact arm for a high-efficiency heat dissipation type circuit breaker.

[0022] In the figure: 1-contact arm cylinder, 2-heat dissipation port, 3-heat dissipation cylinder, 4-heat dissipation cavity, 5-drainage plate, 6-heat dissipation fins, 7-connecting ring, 8-mounting wall, 9-positioning hole, 10-connecting hole, 11-air inlet, 12-air outlet. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 and Figure 3 , a contact arm for a high-efficiency heat-dissipating circuit breaker, comprising a contact arm cylinder 1, on which the contact arm cylinder 1 is provided with two or more heat dissipation ports 2, which allow the high-temperature air in the contact arm cylinder 1 to flow outward, thereby reducing the heat accumulation in the contact arm cylinder 1, and a heat dissipation cylinder 3 is coaxially mounted on the contact arm cylinder 1, wherein the diameter of the heat dissipation cylinder 3 is larger than the diameter of the contact arm cylinder 1, and a heat dissipation cavity 4 is provided between the heat dissipation cylinder 3 and the contact arm cylinder 1, and the heat dissipation cavity 4 serves as an additional heat dissipation space, capable of storing and dissipating more heat. By introducing flowing gas, the heat dissipation cavity 4 can bring out the high-temperature gas, thereby further reducing the temperature of the contact arm cylinder 1. The design of the heat dissipation cavity 4 increases the structural stability of the contact arm cylinder 1. Due to its additional space, it can absorb and disperse part of the heat, thereby reducing the direct thermal shock to the contact arm cylinder 1, thereby increasing the life of the contact arm cylinder 1. Flowing gas is introduced into the heat dissipation cavity 4, which can bring out the high-temperature gas in the heat dissipation cavity 4, thereby reducing the temperature of the contact arm cylinder 1, please refer to Figure 4 and Figure 5 Two or more guide plates 5 are arranged on the inner wall of the heat dissipation cylinder 3 along its circumferential direction. The guide plates 5 guide the air along the air flow direction in the heat dissipation cavity 4. The guide plates 5 have a funnel-shaped cross section. The guide plates 5 are arranged above the heat dissipation port 2. When the circulating gas passes through the guide plates 5, due to the funnel-shaped guide plates 5, the flowing gas within a certain range will be gathered into the guide plates 5 to flow, and this gathering effect will enhance the flow velocity of the fluid in the guide plates 5, so that the fluid pressure in the guide plates 5 is lower than the pressure of the surrounding gas. At this time, the hot gas in the heat dissipation port 2 below the guide plates 5 will be pressed into the guide plates 5 and flow out with the flowing gas, thereby reducing the accumulation of high-temperature gas inside the contact arm cylinder 1.

[0025] See also Figure 5, the inner wall of the heat dissipation cylinder 3 is also provided with heat dissipation fins 6 along its circumferential direction. The end of the heat dissipation fins 6 away from the heat dissipation cylinder 3 contacts the contact arm cylinder 1. The installation direction of the heat dissipation fins 6 is installed along the air flow direction in the heat dissipation cavity 4. The heat dissipation fins 6 can absorb the temperature on the surface of the contact arm cylinder 1, and then the flowing air will take the temperature out of the heat dissipation fins 6. The heat dissipation fins 6 can significantly increase the surface area in contact with the surrounding air, thereby enhancing the efficiency of heat exchange. In this way, the heat dissipation fins 6 can transfer the heat generated inside the cylinder to the external air more quickly. When the air flows along the direction in which the heat dissipation fins 6 are arranged, it can take away the heat absorbed by the heat dissipation fins 6. This design uses the flow of air to enhance the convection effect and further speed up the heat dissipation process. Please refer to Figure 1 and Figure 2 The heat dissipation cylinder 3 is made of insulating heat-conducting material, an air inlet 11 is provided at the left end of the heat dissipation cylinder 3, and an air outlet 12 is provided at the right end of the heat dissipation cylinder 3. By controlling the corresponding relationship between the width of the guide plate 5 and the heat dissipation port 2, the distribution of the airflow in the heat dissipation cylinder 3 can be adjusted to a certain extent to make it more uniform, avoid local overheating and airflow dead zones, and thus improve the overall heat dissipation effect. If the width of the guide plate 5 is smaller than the width of the heat dissipation port 2, the airflow may suffer a large loss when passing through the guide plate 5, because the airflow will form a bottleneck at the heat dissipation port 2, causing a local pressure increase, thereby reducing the airflow through the heat dissipation port 2.

[0026] See also Figure 3 A connecting ring 7 is fixedly installed on the left end face of the contact arm cylinder 1. A mounting wall 8 is fixedly installed on the right end face of the contact arm cylinder 1. Two or more positioning holes 9 are arranged on the mounting wall 8 along its circumferential direction. The positioning holes 9 can be used to ensure the position accuracy of the contact arm cylinder 1 when assembled with other parts. Through the corresponding positioning pins or screws and the positioning holes 9, the operator can quickly align and install the parts through the pre-set hole positions, which not only improves the installation efficiency but also reduces the possibility of errors. In the case where the contact arm cylinder 1 needs to be disassembled and reinstalled multiple times, the positioning holes 9 can ensure that the position remains consistent after each assembly. A connecting hole 10 is coaxially arranged at the center of the mounting wall 8.

[0027] Working principle: When dissipating heat, flowing gas is introduced from the air inlet 11. When the flowing gas enters the heat dissipation cavity 4, a part of the flowing gas will pass through the guide plate 5. When the flowing gas passes through the guide plate 5, due to the funnel shape of the guide plate 5, the flowing gas within a certain range will be gathered into the guide plate 5 to flow, and this gathering effect will increase the flow speed of the fluid in the guide plate 5, so that the fluid pressure in the guide plate 5 is less than the pressure of the surrounding gas. At this time, the hot gas in the heat dissipation port 2 below the guide plate 5 will be pressed into the guide plate 5 and flow out with the flowing gas, reducing the accumulation of high-temperature gas inside the contact arm cylinder 1; another part of the flowing gas will pass through the heat dissipation fins 6, and the heat dissipation fins 6 can significantly increase the surface area in contact with the surrounding air, thereby enhancing the efficiency of heat exchange, and can more quickly conduct the heat generated inside the contact arm cylinder 1 to the external air, accelerating the heat dissipation process. The flowing gas that has absorbed a large amount of heat is finally discharged from the outlet 12.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0029] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A contact arm for a high-efficiency heat dissipation type circuit breaker, comprising a contact arm cylinder (1), characterized in that: The contact arm cylinder (1) is provided with two or more heat dissipation ports (2), a heat dissipation cylinder (3) is coaxially mounted on the contact arm cylinder (1), the diameter of the heat dissipation cylinder (3) is larger than the diameter of the contact arm cylinder (1), a heat dissipation cavity (4) is provided between the heat dissipation cylinder (3) and the contact arm cylinder (1), flowing gas is introduced into the heat dissipation cavity (4), the inner wall of the heat dissipation cylinder (3) is provided with two or more guide plates (5) along its circumferential direction, the guide plates (5) guide flow in a direction along the air flow direction in the heat dissipation cavity (4) to increase the speed, the guide plates (5) have a funnel-shaped cross section, and the guide plates (5) are arranged above the heat dissipation ports (2).

2. The contact arm for a high-efficiency heat dissipation circuit breaker according to claim 1, characterized in that: The inner wall of the heat dissipation cylinder (3) is also provided with heat dissipation fins (6) along its circumferential direction; one end of the heat dissipation fins (6) away from the heat dissipation cylinder (3) contacts the outer wall of the contact arm cylinder (1); and the heat dissipation fins (6) are installed along the air flow direction in the heat dissipation cavity (4).

3. The contact arm for a high-efficiency heat dissipation circuit breaker according to claim 1, characterized in that: A connecting ring (7) is fixedly mounted on the left end surface of the contact arm cylinder (1).

4. The contact arm for a high-efficiency heat dissipation circuit breaker according to claim 1, characterized in that: A mounting wall (8) is fixedly mounted on the right end surface of the contact arm cylinder (1), two or more positioning holes (9) are arranged on the mounting wall (8) along its circumferential direction, and a connecting hole (10) is coaxially arranged at the center of the mounting wall (8).

5. The contact arm for a high-efficiency heat dissipation circuit breaker according to claim 1, characterized in that: The heat dissipation cylinder (3) is made of insulating heat-conducting material, an air inlet (11) is arranged at the left end of the heat dissipation cylinder (3), and an air outlet (12) is arranged at the right end of the heat dissipation cylinder (3).

6. The contact arm for a high-efficiency heat dissipation circuit breaker according to claim 1, characterized in that: The narrowest width of the guide plate (5) is equal to the width of the heat dissipation port (2).

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