Electromagnetic switch

Abstract

The utility model discloses an electromagnetic switch, which relates to the technical field of switches and comprises a shell assembly and a switch assembly, the shell assembly comprises a shell and a breathable film, the shell is provided with a breathable channel and a breathable hole which are communicated with each other, one end of the breathable channel is open, and the other end of the breathable channel is closed. The ventilation holes are located in the side portions of the ventilation channels, and the ventilation films are arranged in the ventilation channels and located between the ventilation holes and the opening ends of the ventilation channels. The switch assembly comprises a static contact and a moving contact which are arranged on the shell, and the moving contact is connected with the shell in a sliding mode and can be connected with or disengaged from the static contact during sliding. The interior of the shell can be communicated with external air through the ventilation channel and the ventilation holes, so that water vapor generated in the shell can be discharged in time, and imbalance of air pressure inside and outside the shell is avoided. As one end of the ventilation channel is closed and the ventilation hole is located at the side part of the ventilation channel, external sundries are not easy to pass through the ventilation hole to be attached to the ventilation film, and the ventilation performance of the electromagnetic switch is good.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to an electromagnetic switch. Background Art

[0002] Electromagnetic switches are divided into two types: AC and DC. They are generally used to connect and disconnect electrical equipment that is started frequently over long distances. Push button switches are used to safely and quickly control the electrical equipment used through electromagnetic switches, and low voltage and current are used to control the operation of high-voltage and high-current equipment, which has the advantages of safety and reliability.

[0003] The prior art with announcement number CN201252059Y discloses an improved electromagnetic switch, including an electromagnet part and a switch part, wherein the electromagnet part includes a cylindrical coil support with an iron core inside, a coil is wound on the coil support, and the switch part is arranged at the end of the coil support, wherein the coil is an inner and outer two-layer structure, wherein the inner layer is a pull-in coil, and the outer layer is a holding coil, wherein the pull-in coil and the holding coil are made of different conductive materials respectively. The coil of the electromagnetic switch uses an inner and outer double-layer structure, wherein the inner layer or the outer layer is made of other relatively low-priced conductive materials instead of the original copper, which greatly reduces the production cost.

[0004] However, the prior art still has defects. For example, the electromagnetic switch is not provided with a vent hole. If water vapor is easily generated inside the electromagnetic switch during operation, if the water vapor cannot be discharged, it will cause an imbalance in the internal and external air pressure of the electromagnetic switch and affect its operation. The electromagnetic switch has been improved by providing a vent hole, but the vent hole is completely exposed to the outside and is easily blocked by dust, thereby affecting the ventilation effect. Utility Model Content

[0005] In view of this, it is necessary to provide an electromagnetic switch to solve the technical problem that the ventilation holes of the electromagnetic switch in the prior art are completely exposed to the outside and easily clogged by dust, thereby affecting the ventilation effect.

[0006] In order to achieve the above technical purpose, the technical solution of the utility model provides an electromagnetic switch, including:

[0007] A shell assembly, comprising a shell and a breathable membrane, wherein an active cavity is provided in the shell, and a breathable passage connected to the active cavity and a breathable hole connected to a side of the breathable passage are provided, and one end of the breathable passage away from the active cavity is closed; the breathable membrane is provided in the breathable passage and between the breathable hole and the active cavity;

[0008] The switch assembly comprises a stationary contact and a moving contact, wherein the stationary contact is arranged in the movable cavity, and the moving contact is slidably arranged in the movable cavity and can be slidably connected to or separated from the stationary contact.

[0009] Furthermore, the air permeable channel includes a first channel and a second channel, the diameter of the first channel is larger than the diameter of the second channel, one end of the first channel is connected to the interior of the shell, and the other end is connected to the second channel, the end of the second channel away from the first channel is closed, the air hole is arranged on the side of the second channel, and the air permeable membrane is connected to the end of the second channel close to the first channel.

[0010] Furthermore, an active cavity is provided in the shell, the active cavity is connected to the first channel, and the moving contact is located in the active cavity and can slide back and forth in the active cavity.

[0011] Furthermore, the shell is provided with a sink groove, the diameter of the sink groove is larger than the diameter of the first channel, the sink groove connects the first channel and the active cavity, and when the moving contact is connected to the static contact, the moving contact is located in the sink groove.

[0012] Furthermore, there are a plurality of ventilation holes, and the plurality of ventilation holes are arranged around the circumference of the ventilation channel, and each of the ventilation holes connects the ventilation channel with the external air.

[0013] Furthermore, one end of the stationary contact is located outside the shell, and the other end is located in the active cavity. The end of the stationary contact located in the active cavity has a plurality of protrusions arranged side by side, and the top ends of the plurality of protrusions are located in the same plane.

[0014] Furthermore, the switch assembly also includes a reset spring, which is connected to the moving contact and the housing. The reset spring can accumulate elastic force when the moving contact is connected to the stationary contact, and can release the elastic force to drive the moving contact to separate from the stationary contact.

[0015] Furthermore, the breathable membrane is a one-way breathable membrane, and the water vapor in the breathable channel can be emitted to the outside of the shell through the one-way breathable membrane, and the water vapor outside the shell can be blocked from entering the breathable channel.

[0016] Furthermore, the switch assembly also includes a coil sleeved on the moving contact, and the moving contact can slide to connect with the stationary contact when the coil is energized.

[0017] Furthermore, the shell is also provided with a slide groove, the moving contact includes a moving iron core, a push rod and a moving contact piece, the two ends of the push rod are respectively connected to the moving contact piece and the moving iron core, the coil is arranged between the push rod and the moving iron core, the moving iron core is slidably connected to the slide groove, and can slide along the slide groove when the coil is energized to drive the moving contact piece to connect to the static contact.

[0018] Compared with the prior art, the beneficial effects of the utility model include: the electromagnetic switch protected by the utility model is electrically connected through the moving contact and the static contact, and the moving contact and the static contact are powered off when disconnected. The inside of the shell can be connected to the outside air through the air permeable channel and the air permeable hole, so that the water vapor generated inside the shell can be discharged through the air permeable channel and the air permeable hole in time, avoiding the imbalance of air pressure inside and outside the shell and affecting the work. Since one end of the air permeable channel is closed, it can prevent external objects from directly attaching to the air permeable membrane; the air permeable hole is located on the side of the air permeable channel, so that external debris is not easy to pass through the air permeable hole and attach to the air permeable membrane, and the air permeability of the electromagnetic switch is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the electromagnetic switch of the utility model;

[0020] Figure 2 It is a schematic cross-sectional side view of the electromagnetic switch of the utility model;

[0021] Figure 3 It is a cross-sectional front view schematic diagram of the electromagnetic switch of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the static contact of the utility model. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0024] refer to Figure 1 The utility model provides an electromagnetic switch 100, which is widely used, for example, in electrical equipment to control the on and off of the electrical equipment. In addition, the water vapor generated by the electromagnetic switch 100 during operation can be discharged to the outside air in time through the breathable membrane to avoid the imbalance of the internal and external air pressure of the electromagnetic switch 100. Since the breathable membrane is not directly exposed to the outside, it is not easy for debris to accumulate on the breathable membrane, and the electromagnetic switch 100 can maintain good air permeability.

[0025] refer to Figure 2 and Figure 3 The electromagnetic switch 100 includes a housing component 1 and a switch component 2 connected to each other. The housing component 1 is used to ventilate the electromagnetic switch 100 to allow water vapor to be discharged; the switch component 2 is used to control the on and off of the electromagnetic switch 100.

[0026] The housing assembly 1 includes a body 11 , a cover 12 and a breathable membrane 13 . The cover 12 is connected to the body 11 to form a housing together, and the breathable membrane 13 is connected to the cover 12 . Figure 1The body 11 and the cover 12 of the illustrated embodiment are detachably connected by screws to facilitate disassembly of components inside the electromagnetic switch 100. In other embodiments, the body 11 and the cover 12 may also be welded or integrally formed to make the housing an integral structure.

[0027] The longitudinal section of the cover body 12 is roughly U-shaped. When the cover body 12 is connected to the body 11, an active cavity 14 is formed between the cover body 12 and the body 11. The active cavity 14 is used to accommodate the switch assembly 2 and provide space for the movement of the switch assembly 2.

[0028] The portion of the cover 12 away from the main body 11 is provided with a sink 121, a first channel 122, and a second channel 123 that are connected in sequence, and the diameters of the sink 121, the first channel 122, and the second channel 123 are successively reduced, and the first channel 122 and the second channel 123 are connected to each other to form a ventilation channel. The sink 121 is connected to the active cavity 14, and a ventilation hole 124 is provided on the side of the second channel 123, and the ventilation hole 124 is connected to the second channel 123 and the external air, so that the water vapor generated by the active cavity 14 can be discharged to the external air through the sink 121, the first channel 122, the second channel 123, and the ventilation hole 124 in sequence.

[0029] The breathable membrane 13 is disposed at the end of the second channel 123 close to the first channel 122, which can also be understood as being disposed at the connection between the first channel 122 and the second channel 123. The breathable membrane 13 can be fixed by adhesive or screws.

[0030] The breathable membrane 13 can be a one-way breathable membrane. The water vapor in the second channel 123 can be dissipated to the outside through the breathable membrane 13, and the external water vapor cannot enter the second channel 123 through the breathable membrane 13. While ensuring the discharge of water vapor, it can also prevent external water vapor from entering the second channel 123 to the active cavity 14.

[0031] The number of the air holes 124 is not limited and can be one or more. In one embodiment, the number of the air holes 124 is multiple, and the multiple air holes 124 are arranged around the circumference of the second channel 123, so that the water vapor in the second channel 123 can be dissipated through the multiple air holes 124 at the same time, which is beneficial to improving the discharge efficiency of the water vapor.

[0032] The body 11 defines a slide groove 111 , which extends along the sliding direction of the switch assembly 2 .

[0033] refer to Figure 2 and Figure 3The switch assembly 2 includes a static contact 21, a moving contact 22, a return spring 23 and a coil 24. The moving contact 22 includes a push rod 221, a moving contact piece 222 and a moving iron core 223. One end of the push rod 221 extends into the active cavity 14 and is connected to the moving contact piece 222. The other end of the push rod 221 is connected to the moving iron core 223. The coil 24 is arranged between the push rod 221 and the moving iron core 223. The return spring 23 connects the body 11 and the push rod 221.

[0034] The static contact 21 is inserted into the cover 12, and one end of the static contact 21 extends into the active cavity 14, and is used to connect or disconnect with the moving contact piece 222. The other end of the static contact 21 is located outside the cover 12, and is used to connect to the circuit of the electrical device. The number of static contacts 21 is not limited, and can be one or more. Figure 2 The number of the stationary contacts 21 in the illustrated embodiment is two, and the two stationary contacts 21 can be connected to two circuits to control the on and off of the two circuits at the same time.

[0035] refer to Figure 4 The static contact 21 has a plurality of protrusions 211 arranged side by side at the end of the active cavity 14, and the top ends of the plurality of protrusions 211 are located in the same plane so as to be electrically connected to the moving contact piece 222 at the same time, which is beneficial to improving the electrical connection quality between the static contact 21 and the moving contact piece 222 and is less likely to cause poor contact.

[0036] The moving iron core 223 is slidably disposed in the slide slot 111 and can slide back and forth along the slide slot 111 to drive the push rod 221 to move back and forth. When the push rod 221 moves back and forth, it can drive the moving contact piece 222 to move back and forth so that the moving contact piece 222 is connected to or separated from the stationary contact 21.

[0037] The coil 24 is sleeved on the push rod 221. When the coil 24 is energized, the moving iron core 223 is driven to slide toward the active cavity 14 by electromagnetic induction, so as to drive the moving contact piece 222 to connect to the static contact 21 through the push rod 221. In other embodiments, the moving iron core 223 can also be driven by other means, for example, the moving iron core 223 is connected to a cylinder, and the moving iron core 223 is driven to slide back and forth by the cylinder.

[0038] The reset spring 23 connects the body 11 and the push rod 221. When the push rod 221 slides toward the active cavity 14, the push rod 221 compresses the reset spring 23, driving the reset spring 23 to accumulate elastic force. When the coil 24 is powered off, the electromagnetic induction disappears, the reset spring 23 releases the elastic force and drives the push rod 221 to slide away from the active cavity 14, and the push rod 221 drives the moving contact piece 222 to separate from the static contact 21. The part of the push rod 221 located outside the housing can be used to access the circuit of the electrical device, and the connection or disconnection of the moving contact piece 222 and the static contact 21 can be used to control the on and off of the circuit of the electrical device.

[0039] The sink 121 is connected to the first channel 122 and the active cavity 14. When the movable contact piece 222 is connected to the stationary contact 21, the end of the push rod 221 is located in the sink 121, so that the push rod 221 has sufficient movement space to facilitate the movable contact piece 222 to fully connect with the stationary contact 21.

[0040] The above is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. An electromagnetic switch, characterized in that: include: A shell assembly, comprising a shell and a breathable membrane, wherein an active cavity is provided in the shell, and a breathable passage connected to the active cavity and a breathable hole connected to a side of the breathable passage are provided, and one end of the breathable passage away from the active cavity is closed; the breathable membrane is provided in the breathable passage and between the breathable hole and the active cavity; The switch assembly comprises a stationary contact and a moving contact, wherein the stationary contact is arranged in the movable cavity, and the moving contact is slidably arranged in the movable cavity and can be slidably connected to or separated from the stationary contact.

2. The electromagnetic switch according to claim 1, characterized in that: The air permeable channel includes a first channel and a second channel, the diameter of the first channel is larger than the diameter of the second channel, one end of the first channel is connected to the interior of the shell, and the other end is connected to the second channel, the end of the second channel away from the first channel is closed, the air hole is arranged on the side of the second channel, and the air permeable membrane is connected to the end of the second channel close to the first channel.

3. The electromagnetic switch according to claim 2, characterized in that: An active cavity is provided in the housing, the active cavity is connected to the first channel, and the moving contact is located in the active cavity and can slide back and forth in the active cavity.

4. The electromagnetic switch according to claim 3, characterized in that: The housing is provided with a sinking groove, the diameter of which is greater than the diameter of the first channel, the sinking groove is connected to the first channel and the active cavity, and when the moving contact is connected to the stationary contact, the moving contact is located in the sinking groove.

5. The electromagnetic switch according to claim 1, characterized in that: There are multiple air holes, and the multiple air holes are arranged around the circumference of the air passage, and each of the air holes is connected to the air passage and the external air.

6. The electromagnetic switch according to claim 3, characterized in that: One end of the stationary contact is located outside the shell, and the other end is located in the active cavity. The end of the stationary contact located in the active cavity has a plurality of protrusions arranged side by side, and the top ends of the plurality of protrusions are located in the same plane.

7. The electromagnetic switch according to claim 1, characterized in that: The switch assembly further includes a return spring, which is connected to the moving contact and the housing. The return spring can accumulate elastic force when the moving contact is connected to the stationary contact, and can release the elastic force to drive the moving contact to separate from the stationary contact.

8. The electromagnetic switch according to claim 1, characterized in that: The breathable membrane is a one-way breathable membrane, and the water vapor in the breathable channel can be emitted to the outside of the shell through the one-way breathable membrane, and the water vapor outside the shell can be blocked from entering the breathable channel.

9. The electromagnetic switch according to claim 1, characterized in that: The switch assembly further comprises a coil sleeved on the moving contact, and the moving contact can slide to be connected with the stationary contact when the coil is energized.

10. The electromagnetic switch according to claim 9, characterized in that: The shell is also provided with a slide groove, and the moving contact includes a moving iron core, a push rod and a moving contact piece. The two ends of the push rod are respectively connected to the moving contact piece and the moving iron core. The coil is arranged between the push rod and the moving iron core. The moving iron core is slidably connected to the slide groove and can slide along the slide groove when the coil is energized to drive the moving contact piece to connect to the static contact.

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