An overload protection device for an air compressor motor

Abstract

This utility model relates to the field of motor overload protection technology, specifically an overload protection device for an air compressor motor. It includes a first housing, with a first slot at the top of the first housing. A connecting cylinder is engaged within the first slot, and a spring switch is telescopically installed within the connecting cylinder. A semi-cylinder is fixedly installed at the bottom of the spring switch, and the semi-cylinder is slidably installed within a sliding groove. The sliding groove is located within a protection chamber, which is situated inside the first housing. This utility model utilizes a combination of a copper-nickel composite layer and an iron-aluminum alloy layer. The high thermal conductivity of the copper-nickel layer allows for rapid transfer of overload heat, while the thermal expansion characteristics of the iron-aluminum layer significantly shorten the overload response time, reducing the risk of motor damage. Simultaneously, the mechanical self-locking of the insulating partition and the spring reset design form a physical isolation barrier, completely eliminating the problem of accidental connection, reducing maintenance costs, and ensuring stable equipment operation.

Description

Technical Field

[0001] This utility model relates to the field of motor overload protection technology, specifically an overload protection device for an air compressor motor. Background Technology

[0002] An air compressor motor overload protection device is a safety device used to monitor and protect the air compressor motor. When the motor operating current exceeds the rated value, this device can quickly cut off the power supply to prevent the motor from being damaged due to overload. Its core function is to prevent the motor from overheating and burning out, extend the service life of the equipment, and prevent production accidents and safety risks caused by motor failure, thereby ensuring the stable and reliable operation of the air compressor system.

[0003] However, traditional bimetallic strip overload protection devices have a long response time due to the low thermal conductivity of the materials (such as the thermal conductivity of iron-copper combination ≤50W / m·K) and the mismatch of thermal expansion coefficients. This makes them unable to meet the rapid power-off requirements of high-load motors. Furthermore, existing technologies rely on the natural cooling and reset of the metal strip and lack a mechanical self-locking mechanism. This makes it easy for the circuit connection to be automatically restored without maintenance, leading to repeated overload faults and significant safety hazards. Utility Model Content

[0004] The purpose of this utility model is to provide an overload protection device for an air compressor motor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An overload protection device for an air compressor motor includes a first housing, a first slot at the top of the first housing, a connecting cylinder engaged in the first slot, a spring switch telescopically installed inside the connecting cylinder, a semi-cylinder fixedly installed at the bottom of the spring switch, the semi-cylinder slidably installed in a sliding groove, the sliding groove being located inside a protection chamber, and the protection chamber being located inside the first housing.

[0006] Preferably, an insulating partition is installed on one side of the protective chamber via a pivot pin. The top of the insulating partition is attached to the bottom of the semi-cylinder, and a spring is fixedly installed at the bottom of the insulating partition. The spring is fixedly installed at the bottom of the sliding groove.

[0007] The protective compartment has two guide plate slots on both sides of the sliding groove. A first guide plate and a second guide plate are respectively installed in the guide plate slots by pins. The first guide plate and the second guide plate have guide holes.

[0008] Preferably, the first guide plate is attached to the inner surface of the insulating partition, and a double-layer metal sheet is mounted on the second guide plate by means of pins.

[0009] Preferably, the double-layer metal sheet is composed of a copper-nickel composite layer and an iron-aluminum alloy layer, wherein the copper-nickel composite layer is close to the second guide plate, and the iron-aluminum alloy layer is bonded to the outer surface of the insulating partition through the guide block.

[0010] Preferably, a second housing is bolted to one side of the first housing, and a second slot is provided at the top of the second housing. The second slot fits into the first slot so that the connecting cylinder is engaged and fixed.

[0011] Preferably, the second housing has an elastic chamber, and pressure blocks are fixedly installed on both sides of the second housing adjacent to the elastic chamber. The pressure blocks are embedded in the guide plate groove so that the first guide plate and the second guide plate are clamped and fixed.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This air compressor motor overload protection device utilizes a gradient material combination of a copper-nickel composite layer and an iron-aluminum alloy layer. The high thermal conductivity of the copper-nickel layer (≥220 W / m·K) rapidly transfers overload heat, combined with the precisely matched difference in thermal expansion coefficients between the iron and aluminum layers (Δα=9.2×10⁻⁻⁻⁴). 6 / ℃), shortening the overload response time, improving efficiency compared to traditional iron-copper bimetallic strips, and significantly reducing the risk of motor damage caused by delayed power-off.

[0013] This air compressor motor overload protection device, through the mechanical self-locking structure of the insulating partition and the coordinated design of spring reset, forms a physical isolation barrier after the circuit is disconnected, completely eliminating the problem of false connection caused by the cooling reset of the metal plate in traditional devices. At the same time, it reduces the frequency of manual reset intervention, lowers maintenance costs, and ensures long-term stable operation of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the disassembled structure of this utility model; Figure 3 This is a schematic diagram of the structure of the first housing of this utility model; Figure 4 This is a schematic diagram of the structure of the second shell of this utility model.

[0015] In the diagram: 101, First housing; 102, First slot; 103, Connecting cylinder; 104, Spring switch; 105, Semi-cylinder; 106, Sliding groove; 107, Protective chamber; 108, Insulating partition; 109, Spring; 110, Guide plate groove; 111, First guide plate; 112, Second guide plate; 113, Guide hole; 114, Double-layer metal sheet; 115, Guide block; 116, Second housing; 117, Second slot; 118, Spring chamber; 119, Pressure block. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-4 As shown, this utility model provides a technical solution: An overload protection device for an air compressor motor includes a first housing 101. A first slot 102 is provided at the top of the first housing 101. A connecting cylinder 103 is engaged and installed in the first slot 102. A spring switch 104 is telescopically installed in the connecting cylinder 103. A semi-cylinder 105 is fixedly installed at the bottom of the spring switch 104. The semi-cylinder 105 is slidably installed in a sliding groove 106. The sliding groove 106 is opened in a protection chamber 107. The protection chamber 107 is opened inside the first housing 101.

[0018] The above scheme provides an installation base for the overall structure through the first housing, enables quick disassembly and maintenance of the spring switch through the engagement of the first slot and the connecting cylinder, directly controls the circuit on / off through the extension and retraction of the spring switch, ensures the linear accuracy of the triggering action through the sliding cooperation between the semi-cylinder and the sliding groove, and provides a sealed space for the movement of the semi-cylinder through the protective chamber to prevent external interference.

[0019] In this embodiment, preferably, an insulating partition 108 is installed on one side of the protective chamber 107 via a shaft pin. The top of the insulating partition 108 is attached to the bottom of the semi-cylinder 105, and a spring 109 is fixedly installed at the bottom of the insulating partition 108. The spring 109 is fixedly installed at the bottom of the sliding groove 106.

[0020] The above scheme achieves the mechanical freedom of rotation around the axis through the insulating partition mounted by the shaft pin, transmits the displacement trigger signal through the contact between the top of the insulating partition and the semi-cylinder, provides the reverse driving force for the reset of the insulating partition through the energy storage of the spring compression, and ensures the stability of the reset trajectory through the spring fixing at the bottom of the sliding groove.

[0021] In this embodiment, preferably, the protective chamber 107 has two guide plate grooves 110 on both sides adjacent to the sliding groove 106. A first guide plate 111 and a second guide plate 112 are respectively installed in the guide plate grooves 110 by means of pins. Guide holes 113 are provided on the first guide plate 111 and the second guide plate 112.

[0022] The above scheme provides directional mounting positions for the first and second guide plates through guide plate grooves, fixes the guide plates with pins to prevent vibration and displacement, accelerates heat dissipation through the guide hole structure of the first and second guide plates to reduce the temperature rise of the metal sheet, and optimizes the current diversion and heat conduction path through the stacked layout of the guide plates.

[0023] In this embodiment, preferably, the first guide plate 111 is attached to the inner surface of the insulating partition 108, and a double-layer metal sheet 114 is installed on the second guide plate 112 by means of pins.

[0024] The above scheme establishes an initial circuit conduction state by bonding the first guide plate with the inner surface of the insulating partition. The double-layer metal sheet undergoes directional bending due to heat deformation. Physical isolation after circuit disconnection is achieved through the limiting contact between the guide block and the insulating partition. The heat conduction efficiency is ensured by the pin installation of the double-layer metal sheet and the second guide plate.

[0025] In this embodiment, preferably, the double-layer metal sheet 114 is composed of a copper-nickel composite layer and an iron-aluminum alloy layer, wherein the copper-nickel composite layer is close to the second guide plate 112, and the iron-aluminum alloy layer is attached to the outer surface of the insulating partition 108 through the guide block 115.

[0026] The above scheme accelerates the transfer of heat to the deformation layer through the high thermal conductivity of the copper-nickel composite layer, precisely triggers the deformation action through the difference in thermal expansion coefficients of the iron-aluminum alloy layer, shortens the response time by 40% through the gradient material combination, and ensures zero-loss transfer of deformation displacement through the direct contact between the guide block and the iron-aluminum alloy layer.

[0027] In this embodiment, preferably, a second housing 116 is bolted to one side of the first housing 101, and a second slot 117 is provided at the top of the second housing 116. The second slot 117 fits into the first slot 102 so that the connecting cylinder 103 is engaged and fixed.

[0028] The above scheme achieves modular expansion through a second housing installed with bolts, enhances the vibration resistance of the connecting cylinder by fitting the second slot with the first slot, and reduces electromagnetic interference by separating the circuit control unit and the mechanical transmission unit through the double-housing structure.

[0029] In this embodiment, preferably, a spring-loaded chamber 118 is provided inside the second housing 116, and pressure blocks 119 are fixedly installed on both sides of the second housing 116 adjacent to the spring-loaded chamber 118. The pressure blocks 119 are embedded in the guide plate groove 110 so that the first guide plate 111 and the second guide plate 112 are clamped and fixed.

[0030] The above scheme provides a buffer space for the guide plate to reset through the spring-loaded chamber, eliminates the positional displacement of the guide plate during deformation through the clamping design of the pressure block embedded in the guide plate groove, and ensures the instantaneousness and reliability of the overload triggering action through the rigid contact between the pressure block and the guide plate.

[0031] In this embodiment, an air compressor motor overload protection device operates normally. When the spring switch 104 is pressed by an external force, it causes the semi-cylinder 105 at its bottom end to move down along the sliding groove 106. The sliding of the semi-cylinder 105 forces the insulating partition 108 to rotate around the pivot pin, while simultaneously compressing the spring 109 to store energy. After the insulating partition 108 rotates, its inner surface disengages from the first guide plate 111, exposing the first guide plate 111. At this time, the double-layer metal sheet 114 is attached to the first guide plate 111 through the guide block 115. The guide block 115 applies a reverse limiting force to the insulating partition 108 to maintain its stable state, thereby forming a closed circuit path. Current continuously flows through the first guide plate 111 and the second guide plate 112. In particular, the double-layer metal sheet 114 adopts a gradient material design of copper-nickel composite layer and iron-aluminum alloy layer: copper-nickel composite layer (thermal conductivity ≥220). The heat generated by the overload current is tightly bonded to the second conductor plate 112 (W / m·K), conducting the heat to the deformation layer at a speed more than three times faster than that of a traditional iron-copper bimetallic sheet; the iron-aluminum alloy layer (thermal expansion coefficient difference Δα=9.2×10⁻) 6(℃) By precisely matching the deformation threshold, bending action can be triggered in a short time, improving the response efficiency by 40% compared to conventional materials; when the motor is overloaded and the circuit overheats abnormally, the heat is quickly conducted to the double-layer metal sheet 114 through the first guide plate 111 and the second guide plate 112. The high thermal conductivity of the copper-nickel composite layer accelerates the heat diffusion, and the iron-aluminum alloy layer undergoes directional bending deformation due to the difference in thermal expansion coefficients, causing the guide block 115 to separate from the first guide plate 111, and the circuit contacts are instantly disconnected; at the same time, the deformation of the double-layer metal sheet 114 releases the limiting effect on the insulating partition 108, the compressed spring 109 quickly rebounds, pushing the insulating partition 108 to rotate in the opposite direction and reset. After the insulating partition 108 is reset, its outer surface re-adheres to the guide block 115, forming a physical isolation barrier, even if the double-layer metal sheet 114 cools down. After restoring to its original state, the guide block 115 is still blocked by the insulating partition 108 and cannot contact the first guide plate 111, ensuring that the circuit remains disconnected and avoiding the risk of automatic reconnection. After maintenance personnel have inspected the circuit, they need to press the spring switch 104 again. The semi-cylinder 105 moves down along the sliding groove 106, triggering the insulating partition 108 to rotate and compress the spring 109, so that the guide block 115 breaks through the limit of the insulating partition 108 and makes a second contact with the first guide plate 111, and the circuit is restored to conduction. This design shortens the overload response time through a dual thermal-mechanical mechanism, and relies on the mechanical self-locking characteristics of the insulating partition 108 to completely eliminate the problem of false connection caused by the cooling and reset of the metal sheet in traditional protection devices. At the same time, the coordinated reset logic of the spring 109 and the guide plate reduces the frequency of manual intervention, significantly improving the safety and maintenance efficiency of the air compressor motor.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An overload protection device for an air compressor motor, comprising a first housing (101), characterized in that: The first housing (101) has a first slot (102) at its top end. A connecting cylinder (103) is engaged in the first slot (102). A spring switch (104) is telescopically installed in the connecting cylinder (103). A semi-cylinder (105) is fixedly installed at the bottom end of the spring switch (104). The semi-cylinder (105) is slidably installed in a sliding groove (106). The sliding groove (106) is located in a protective chamber (107). The protective chamber (107) is located inside the first housing (101). An insulating partition (108) is installed on one side of the protective chamber (107) via a shaft pin. The top end of the insulating partition (108) is attached to the bottom end of the semi-cylinder (105). A spring (109) is fixedly installed at the bottom end of the insulating partition (108). 109) Fixedly installed at the bottom of the sliding groove (106), the protective chamber (107) has two guide plate grooves (110) on both sides of the sliding groove (106). The first guide plate (111) and the second guide plate (112) are respectively installed in the guide plate groove (110) by pins. The first guide plate (111) and the second guide plate (112) are provided with guide holes (113). The first guide plate (111) is in contact with the inner surface of the insulating partition (108). The second guide plate (112) is installed with a double-layer metal sheet (114) by pins. The double-layer metal sheet (114) is composed of a copper-nickel composite layer and an iron-aluminum alloy layer. The copper-nickel composite layer is close to the second guide plate (112), and the iron-aluminum alloy layer is in contact with the outer surface of the insulating partition (108) through the guide block (115).

2. The air compressor motor overload protection device according to claim 1, characterized in that: A second housing (116) is bolted to one side of the first housing (101). A second slot (117) is provided at the top of the second housing (116). The second slot (117) fits into the first slot (102) so that the connecting cylinder (103) is engaged and fixed.

3. The air compressor motor overload protection device according to claim 2, characterized in that: The second housing (116) has an elastic chamber (118) inside. Pressure blocks (119) are fixedly installed on both sides of the second housing (116) adjacent to the elastic chamber (118). The pressure blocks (119) are embedded in the guide plate groove (110) so that the first guide plate (111) and the second guide plate (112) are clamped and fixed.

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