Relay

Abstract

The invention discloses a relay, and relates to the technical field of relays, the relay comprises a shell, a contact mechanism and an electromagnet, the contact mechanism comprises a movable contact and a static contact, the relay also comprises an execution assembly which comprises a plurality of first connecting sheets connected with the corresponding static contact and is used for driving the static contact and the movable contact to be opened and closed, and a protection assembly which is used for protecting the movable contact and the static contact. The positioning mechanism comprises a positioning cylinder fixedly connected with the first connecting sheet, a positioning rod fixedly connected with the static contact is slidably connected in the positioning cylinder, when the static contact and the movable contact are closed and the temperature is within a temperature threshold range, the static contact moves towards the movable contact, and when the temperature exceeds the temperature threshold, the static contact moves towards the movable contact. The static contact moves in the direction away from the movable contact for short-circuit protection, and the limiting assembly is arranged between the shell and the positioning rod and used for controlling the positioning rod to slide in one direction. The switch is automatically switched off when short circuit occurs, and the contact stability of the contacts is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to a relay. Background Art

[0002] Relays, a key component in electrical engineering, are renowned for their unique ability to control high-power circuits with low-power signals. Their core components include a coil, an iron core, and contacts. When current flows through the coil, the generated magnetic field attracts the iron core, which in turn changes the connection state of the contacts, enabling precise on / off control of the circuit. Relays play a vital role in automation control and electrical protection. They not only isolate high voltages but also enable remote control, significantly improving system safety.

[0003] However, a significant flaw in existing relay designs is their lack of automatic protection under short-circuit conditions. When a relay experiences internal overheating, insufficient heat dissipation, or prolonged periods of high load, the moving and stationary contacts may become stuck due to overheating, causing the contacts to remain closed and unable to open properly. This not only increases the risk of a short circuit but can also cause more serious faults in the circuit. Once a short circuit occurs, the sudden increase in current causes the relay contacts to withstand excessive current, and the overload condition rapidly generates a large amount of heat, which can ultimately cause the relay to burn out or even lead to a safety incident. Furthermore, the contacts wear out over time, and the vibrating working environment of the relay can easily lead to poor contact.

[0004] Therefore, a relay having an anti-short circuit function is invented to solve the above problems. Summary of the Invention

[0005] The main purpose of the present invention is to provide a relay that can effectively solve the technical problems in the background technology.

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solution: a relay, comprising a housing, a contact mechanism and an electromagnet, wherein the contact mechanism comprises a movable contact and a static contact, and further comprising:

[0007] An actuator assembly comprising a plurality of first connecting pieces connected to corresponding static contacts, for driving the static contacts and the movable contacts to open and close;

[0008] A protection assembly comprising a positioning cylinder fixedly connected to the first connecting piece, wherein a positioning rod fixedly connected to the static contact is slidably connected within the positioning cylinder, wherein when the static contact and the moving contact are closed and the temperature is within a temperature threshold range, the static contact moves toward the moving contact; when the temperature exceeds the temperature threshold, the static contact moves away from the moving contact to perform short-circuit protection;

[0009] The limiting assembly is arranged between the housing and the positioning rod and is used to control the positioning rod to slide in one direction.

[0010] Preferably, the actuator includes a support frame located in the shell, an armature is hinged on the support frame, a second connecting plate located between the first connecting plates is connected to the armature, the second connecting plate is fixedly connected to the moving contact, and the end of the armature away from the moving contact is connected to the shell through a first elastic member.

[0011] Preferably, the protection component includes a positioning plate slidably connected to the positioning cylinder, the positioning plate is fixedly connected to the positioning rod, the positioning rod includes an inner rod and an outer tube, the inner rod and the outer tube are slidably connected, an adjustment plate is fixed on the inner rod, and the positioning plate is fixedly connected to the outer tube.

[0012] Preferably, the positioning cylinder is filled with thermal expansion gas located between the positioning plate and the adjustment plate, and one end of the positioning plate away from the static contact is connected to the positioning cylinder via a second elastic member.

[0013] Preferably, when the expansion force of the thermally expanding gas is smaller than the elastic force of the second elastic member, the expansion of the thermally expanding gas pushes the adjustment plate to slide in the direction of the moving contact, and the static contact and the moving contact are in close contact.

[0014] Preferably, when the expansion force of the thermally expanding gas is greater than the elastic force of the second elastic member, the thermally expanding gas expands and pushes the positioning plate to slide in a direction away from the moving contact, so that the static contact and the moving contact are separated.

[0015] Preferably, a positioning ring located between the adjustment plate and the static contact is fixed in the positioning cylinder, and a third elastic member is provided between the positioning ring and the adjustment plate for limiting the sliding distance of the adjustment plate.

[0016] Preferably, a heat conducting sheet is fixed to one end of the adjustment plate close to the static contact point for guiding rapid heat transfer.

[0017] Preferably, the limiting assembly includes a ratchet fixedly connected to the positioning rod and located outside the positioning cylinder, a rotating shaft is rotatably connected in the shell, a plurality of ratchets engaged with the ratchet are fixed on the rotating shaft, and a torsion spring is sleeved on the rotating shaft.

[0018] Preferably, one end of the first connecting piece away from the static contact extends out of the housing for connecting a circuit.

[0019] Technical effects and advantages of the present invention:

[0020] The present invention realizes the linkage setting of the thermal expansion gas, the adjustment plate, the positioning rod and the positioning plate, and when the temperature at the static contact and the moving contact is within the temperature threshold, the thermal expansion gas under the influence of the temperature can drive the static contact to move slightly toward the moving contact through the adjustment plate and the positioning rod, so that the static contact and the moving contact can be in close contact in an environment where wear or vibration occurs, avoiding the occurrence of poor contact, thereby increasing the service life of the static contact and the moving contact. At the same time, when the temperature rises sharply or a short circuit occurs, the thermal expansion gas drives the static contact to quickly separate from the moving contact and disconnect through the positioning plate and the positioning rod, thereby implementing a protection measure of automatic disconnection in the event of a short circuit, and responds quickly, effectively ensuring the safety of the equipment during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the present invention after removing the shell;

[0024] Figure 4 Schematic diagram of the structure of the protection component in the present invention;

[0025] Figure 5 It is a schematic cross-sectional view of the structure of the protection component in the present invention;

[0026] Figure 6 This is an exploded diagram of the protective component structure in the present invention;

[0027] In the figure: 1. housing; 2. contact mechanism; 201. moving contact; 202. static contact; 3. electromagnet;

[0028] 4. Actuator; 401. First connecting piece; 402. Support frame; 403. Armature; 404. Second connecting piece; 405. First elastic member;

[0029] 5. Protective assembly; 501. Positioning cylinder; 502. Positioning rod; 5021. Inner rod; 5022. Outer tube; 503. Positioning plate; 504. Adjustment plate; 505. Thermal expansion gas; 506. Second elastic member; 507. Positioning ring; 508. Third elastic member; 509. Heat conducting sheet;

[0030] 6. Limiting assembly; 601. Ratchet; 602. Rotating shaft; 603. Ratchet; 604. Torsion spring. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figure 1 and Figure 2 As shown, this embodiment provides a relay, including a housing 1, a contact mechanism 2 and an electromagnet 3, wherein the contact mechanism 2 includes a movable contact 201 and a static contact 202, and further includes:

[0034] The actuator component 4 includes a plurality of first connecting pieces 401 connected to the corresponding static contacts 202, which are used to drive the opening and closing of the static contacts 202 and the moving contacts 201; the actuator component 4 includes a support frame 402 located in the shell 1, and an armature 403 is hinged on the support frame 402. The armature 403 is connected to a second connecting piece 404 located between the first connecting pieces 401. The second connecting piece 404 is fixedly connected to the moving contact 201, and the end of the armature 403 away from the moving contact 201 is connected to the shell 1 via a first elastic member 405.

[0035] One end of the first connecting piece 401 away from the static contact 202 extends out of the housing 1 for connecting to a circuit.

[0036] In actual use, the electromagnet 3 is first energized, so that the electromagnet 3 generates a magnetic force to attract the armature 403, and the armature 403 swings along the support frame 402 toward the electromagnet 3. The first elastic member 405 is stretched, so that the armature 403 drives the moving contact 201 to contact the static contact 202 through the second connecting piece 404, thereby forming a circuit. When the electromagnet 3 is no longer energized to generate a magnetic force, under the action of the first elastic member 405, the first elastic member 405 drives the armature 403 to swing along the support frame 402 to the initial position, so that the second connecting piece 404 drives the moving contact 201 to contact the static contact 202 away from the electromagnet 3. At this time, it is in a normally closed and unpowered working state, which is convenient for better protection of the circuit.

[0037] Example 2

[0038] During use, it was found that during the contact between the static contact 202 and the moving contact 201, the moving contact 201 and the static contact 202 may experience varying degrees of wear, and in a working environment with vibration, it is easy for the moving contact 201 and the static contact 202 to have poor contact. At the same time, when the circuit temperature is too high or short-circuited, the temperature at the moving contact 201 and the static contact 202 becomes too high. At this time, the moving contact 201 and the static contact 202 have no overload or short-circuit protection, which can easily cause excessive temperature or even fire. Therefore, further improvements are made based on the above embodiment.

[0039] like Figures 3 to 6 As shown, the protection assembly 5 includes a positioning cylinder 501 fixedly connected to the first connecting piece 401, and a positioning rod 502 fixedly connected to the static contact 202 is slidably connected in the positioning cylinder 501. When the static contact 202 and the movable contact 201 are closed and the temperature is within the temperature threshold range, the static contact 202 moves toward the movable contact 201. When the temperature exceeds the temperature threshold, the static contact 202 moves away from the movable contact 201 to perform short-circuit protection;

[0040] The protection component 5 includes a positioning plate 503 that is slidingly connected to the positioning cylinder 501, the positioning plate 503 is fixedly connected to the positioning rod 502, the positioning rod 502 includes an inner rod 5021 and an outer tube 5022, the inner rod 5021 and the outer tube 5022 are slidingly connected, an adjustment plate 504 is fixed on the inner rod 5021, and the positioning plate 503 is fixedly connected to the outer tube 5022.

[0041] The positioning cylinder 501 is filled with thermal expansion gas 505 located between the positioning plate 503 and the adjustment plate 504 . One end of the positioning plate 503 away from the static contact 202 is connected to the positioning cylinder 501 via a second elastic member 506 .

[0042] When the expansion force of the thermal expansion gas 505 is less than the elastic force of the second elastic member 506 , the thermal expansion gas 505 expands and pushes the adjustment plate 504 to slide toward the moving contact 201 , and the static contact 202 and the moving contact 201 are in close contact.

[0043] When the expansion force of the thermal expansion gas 505 is greater than the elastic force of the second elastic member 506 , the thermal expansion gas 505 expands and pushes the positioning plate 503 to slide away from the movable contact 201 , so that the static contact 202 and the movable contact 201 are separated.

[0044] A positioning ring 507 is fixed in the positioning cylinder 501 and is located between the adjustment plate 504 and the static contact 202 . A third elastic member 508 is provided between the positioning ring 507 and the adjustment plate 504 to limit the sliding distance of the adjustment plate 504 .

[0045] A heat conducting sheet 509 is fixed to one end of the adjustment plate 504 close to the static contact 202 for guiding the rapid transfer of heat.

[0046] In actual use, when the moving contact 201 and the static contact 202 are closed and in contact and work, a certain amount of heat will be generated. At this time, the heat is transferred to the heat-expanding gas 505 through the static contact 202 and the heat-conducting plate 509. The heat-expanding gas 505 expands due to the heat and increases in volume. Since the temperature change at this time is within the temperature threshold, the expansion force of the heat-expanding gas 505 is less than the elastic force of the second elastic member 506 and greater than the elastic force of the third elastic member 508. At this time, the heat-expanding gas 505 drives the inner rod 5021 to slide along the outer tube 5022 through the adjustment plate 504, the third elastic member 508 is compressed, and the inner rod 5021 drives the static contact 202 to move along the first connecting piece 401 toward the moving contact 201, so that the static contact 202 can be in closer contact with the moving contact 201, avoiding poor contact.

[0047] When a short circuit occurs or the temperature rises sharply, the temperature at the moving contact 201 and the static contact 202 rises sharply. The temperature on the static contact 202 is transferred to the heat expansion gas 505 through the positioning cylinder 501. A heat conducting sheet 509 is provided on the adjustment plate 504, so that heat can be transferred quickly and the response speed is accelerated. Due to the sharp increase in temperature, the expansion rate of the heat expansion gas 505 increases. Since the adjustment plate 504 will not slide again under the restriction of the positioning ring 507, and the expansion force of the heat expansion gas 505 is greater than that of the second elastic member 506 The elastic force of the hot expansion gas 505 at this time pushes the positioning plate 503 to slide along the positioning cylinder 501 in the direction away from the static contact 202, and the positioning plate 503 drives the static contact 202 to move in the direction away from the moving contact 201 through the positioning rod 502, so that the static contact 202 is out of contact with the moving contact 201, thereby quickly disconnecting the static contact 202 and the moving contact 201. Even when the electromagnet 3 is still energized, the static contact 202 and the moving contact 201 can be quickly separated, ensuring that in the event of a short circuit, a better anti-short circuit effect can be achieved.

[0048] In summary, through the linkage setting of the thermal expansion gas 505, the adjustment plate 504, the positioning rod 502 and the positioning plate 503, and when the temperature at the static contact 202 and the moving contact 201 is within the temperature threshold, the thermal expansion gas 505 under the influence of the temperature can drive the static contact 202 to move slightly toward the moving contact 201 through the adjustment plate 504 and the positioning rod 502, so that the static contact 202 and the moving contact 201 can be in close contact in an environment where wear or vibration occurs, thereby avoiding the occurrence of poor contact, thereby improving the service life of the static contact 202 and the moving contact 201. At the same time, when the temperature rises sharply or a short circuit occurs, the thermal expansion gas 505 drives the static contact 202 to quickly separate from the moving contact 201 and disconnect through the positioning plate 503 and the positioning rod 502, thereby implementing a protection measure of automatic disconnection in the event of a short circuit, and responds quickly, effectively ensuring the safety of the equipment during use.

[0049] Example 3

[0050] During use, it was also found that when the static contact 202 separated from the moving contact 201 under the action of the thermal expansion gas 505, and the thermal expansion gas 505 dissipated heat by itself and stopped expanding, the static contact 202 would reset itself. At this time, if the short circuit problem was not handled, a safety hazard would occur. Therefore, further improvements were made based on the above embodiment.

[0051] like Figure 4 As shown, the limit assembly 6 is arranged between the shell 1 and the positioning rod 502, and is used to control the positioning rod 502 to slide in one direction. The limit assembly 6 includes a ratchet 601 fixedly connected to the positioning rod 502 and located outside the positioning cylinder 501. A rotating shaft 602 is rotatably connected in the shell 1, and a plurality of ratchets 603 engaged with the ratchet 601 are fixed on the rotating shaft 602. A torsion spring 604 is sleeved on the rotating shaft 602.

[0052] In actual use, when the positioning rod 502 with the positioning plate 503 slides in the direction away from the static contact 202, it should be noted that the positioning rod 502 passes through the positioning plate 503 and the positioning cylinder 501 in sequence, and the sliding distance of the inner rod 5021 along the outer tube 5022 is limited. At this time, the positioning rod 502 drives the ratchet 601 to move in the direction away from the static contact 202, and under the action of the ratchet 603, the positioning rod 502 can only move in one direction away from the static contact 202. And when the heat expansion gas 505 dissipates heat, the positioning rod 502 will not reset itself. When the circuit is repaired, the rotating shaft 602 is manually rotated, the torsion spring 604 is wound, and the rotating shaft 602 drives the pawl 603 to no longer engage with the ratchet 601. At this time, under the action of the second elastic member 506, the positioning plate 503 drives the static contact 202 to reset itself through the positioning rod 502, and then the rotating shaft 602 is no longer rotated, and the rotating shaft 602 drives the pawl 603 to engage with the ratchet 601 again.

[0053] In summary, through the setting of the ratchet 601, the pawl 603 and the rotating shaft 602, the positioning rod 502 can slide in one direction, avoiding the situation that after the heat expansion gas 505 dissipates heat, the positioning rod 502 drives the static contact 202 to recover by itself, causing safety problems, and manual inspection is required to disengage the pawl 603 and the ratchet 601 through the rotating shaft 602, so that the static contact 202 resets itself, ensuring safety when repairing the circuit.

[0054] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A relay comprising a housing, a contact mechanism and an electromagnet, wherein the contact mechanism comprises a moving contact and a static contact, characterized in that: Also includes: An actuator assembly comprising a plurality of first connecting pieces connected to corresponding static contacts, for driving the static contacts and the movable contacts to open and close; A protection assembly comprising a positioning cylinder fixedly connected to the first connecting piece, wherein a positioning rod fixedly connected to the static contact is slidably connected within the positioning cylinder, wherein when the static contact and the moving contact are closed and the temperature is within a temperature threshold range, the static contact moves toward the moving contact; when the temperature exceeds the temperature threshold, the static contact moves away from the moving contact to perform short-circuit protection; The limiting assembly is arranged between the housing and the positioning rod and is used to control the positioning rod to slide in one direction.

2. A relay according to claim 1, characterized in that: The actuator assembly includes a support frame located in the shell, an armature is hinged on the support frame, a second connecting piece located between the first connecting pieces is connected to the armature, the second connecting piece is fixedly connected to the moving contact, and the end of the armature away from the moving contact is connected to the shell through a first elastic member.

3. A relay according to claim 1, characterized in that: The protection component includes a positioning plate that is slidably connected to the positioning cylinder, the positioning plate is fixedly connected to the positioning rod, the positioning rod includes an inner rod and an outer tube, the inner rod and the outer tube are slidably connected, an adjustment plate is fixed on the inner rod, and the positioning plate is fixedly connected to the outer tube.

4. A relay according to claim 1, characterized in that: The positioning cylinder is filled with thermal expansion gas located between the positioning plate and the adjustment plate. One end of the positioning plate away from the static contact is connected to the positioning cylinder via a second elastic member.

5. The relay according to claim 1, wherein: When the expansion force of the thermally expanding gas is less than the elastic force of the second elastic member, the thermally expanding gas expands and pushes the adjustment plate to slide toward the moving contact, and the static contact and the moving contact are in close contact.

6. The relay according to claim 1, characterized in that: When the expansion force of the thermally expanded gas is greater than the elastic force of the second elastic member, the thermally expanded gas expands and pushes the positioning plate to slide in a direction away from the moving contact, so that the static contact and the moving contact are separated.

7. The relay according to claim 1, characterized in that: A positioning ring located between the adjustment plate and the static contact is fixed in the positioning cylinder, and a third elastic member is provided between the positioning ring and the adjustment plate for limiting the sliding distance of the adjustment plate.

8. The relay according to claim 1, wherein: A heat conducting sheet is fixed to one end of the adjustment plate close to the static contact point for guiding the rapid transfer of heat.

9. The relay according to claim 1, wherein: The limiting assembly includes a ratchet fixedly connected to the positioning rod and located outside the positioning cylinder. A rotating shaft is rotatably connected in the shell, and a plurality of ratchets engaged with the ratchet are fixed on the rotating shaft. A torsion spring is sleeved on the rotating shaft.

10. The relay according to claim 1, characterized in that: One end of the first connecting piece away from the static contact extends out of the housing for connecting to a circuit.

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