Anti-short-circuit quadrupole linkage electromagnetic relay with contact adhesion monitoring function

Abstract

The invention discloses an anti-short-circuit quadrupole linkage electromagnetic relay with a contact adhesion monitoring function. Comprising a machine frame, an iron core arranged on the machine frame, a coil arranged on the iron core in a sleeving mode, an armature arranged on the machine frame and attracting the iron core after the coil is powered on, a push rod arranged on the machine frame, linked with the armature and achieving left-right reciprocating motion, and a main contact assembly matched with the push rod. And the monitoring contact assembly is arranged on the rack and matched with the push rod, and the monitoring contact assembly is in a non-closed state when the main contact assembly is adhered. By adopting the structure, the push rod is used as a linkage mechanism of the main contact assembly and the monitoring contact assembly, and the pull hook arranged on the push rod can limit the return of the push rod when the main contact assembly is bonded, so that the pull hook of the push rod can pull the monitoring elastic sheet to enable the monitoring contact assembly to be in an open state, and the function of monitoring the contact assembly is achieved.

Description

Technical Field

[0001] The invention relates to a four-pole linkage electromagnetic relay with a short-circuit resistance and a contact adhesion monitoring function, and in particular to a four-pole linkage electromagnetic relay with a compact structure, low impedance load, short-circuit resistance, and a main circuit adhesion monitoring function. Background Art

[0002] With the development of new energy technology, the battery capacity of new energy vehicles is increasing, and the demand for high-power charging piles is increasing. The original three-phase high-power charging piles use two 2-pole relays or four single-pole relays to control the three-phase four-wire circuit. However, the above schemes have problems such as the four poles cannot be linked, poor synchronization, and phase loss output. Therefore, the European market will introduce new standards in 2025, which will not allow non-integrated linked four-pole products to be used in three-phase four-wire circuits. Therefore, it is proposed to develop an integrated linked 4-pole relay product.

[0003] When the existing relay switches at high current, the contact impedance increases significantly, causing the load temperature to rise, affecting the normal function of the product.

[0004] Existing relays generally use copper alloy reeds to provide load and contact pressure. Due to the change of contact impedance, the reed will experience thermal stress relaxation at high temperature, resulting in reduced contact pressure, further deteriorating contact impedance, and causing product temperature to rise. Existing relays generally use copper alloy reeds to provide load and contact pressure. There is a trade-off problem in adjusting contact pressure and load capacity, and the product's short-circuit resistance is mainly reflected in the adjustment of the product's initial pressure and final pressure. The existing relay monitoring design does not take into account the alarm function when the contact is sticking.

[0005] In view of the above situation, the present invention urgently needs to provide a four-pole linkage electromagnetic relay with anti-short circuit and contact adhesion monitoring function. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function, which has the characteristics of compact structure, low impedance load, short-circuit resistance and main circuit adhesion monitoring function.

[0007] In order to solve the above technical problems, the technical solution of the present invention is a four-pole linkage electromagnetic relay with anti-short circuit and contact adhesion monitoring function, and its innovation lies in: the four-pole linkage electromagnetic relay with anti-short circuit and contact adhesion monitoring function includes a frame, an iron core arranged on the frame, a coil sleeved on the iron core, an armature arranged on the frame and attracting the iron core after the coil is energized, a push rod arranged on the frame and linked with the armature to realize left and right reciprocating motion, a main contact assembly coordinated with the push rod, and a monitoring contact assembly arranged on the frame and coordinated with the push rod, and the monitoring contact assembly is in a non-closed state when the main contact assembly is adhered.

[0008] Preferably, the main contact assembly includes a moving contact arranged on the push rod and a static contact arranged on the frame;

[0009] A hook is provided on the push rod on one side close to the monitoring contact assembly; the monitoring contact assembly includes an auxiliary static contact arranged on the frame, a monitoring spring connected to one end of the frame, and an auxiliary moving contact arranged at the other end of the monitoring spring; when the push rod reciprocates left and right, the hook hooks or releases the monitoring spring, and the corresponding auxiliary moving contact and auxiliary static contact are released or closed.

[0010] Preferably, the monitoring spring is formed by bending a metal sheet to form a first part connected to the frame and a second part connected to the first part, the auxiliary moving contact is arranged on the second part, and the hook on the push rod hooks or releases the monitoring spring when it moves relative to the frame.

[0011] Preferably, the anti-short circuit four-pole linkage electromagnetic relay with contact adhesion monitoring function is provided with a plurality of the main contact assemblies, each of which is composed of two main contact assembly units arranged in parallel and in series;

[0012] The main contact assembly unit includes a moving contact connecting plate arranged on the push rod, two moving contacts arranged at both ends of the moving contact connecting plate, two stationary contact connecting plates arranged on the frame, and the stationary contacts arranged on the corresponding stationary contact plates. The moving contact attracts the corresponding stationary contact after the coil is energized.

[0013] Preferably, the push rod is provided with a slot for the movable contact connecting plate to be placed therein, and the slot is provided with a spring respectively connecting the push rod and the movable contact connecting plate.

[0014] Preferably, the moving contact connecting plate is a copper plate.

[0015] Preferably, the moving contact is tilted relative to the static contact in an initial state.

[0016] Preferably, in the initial state, the inclination angle between the moving contact and the horizontal plane is 95-110°.

[0017] Preferably, in the initial state, the inclination angle between the moving contact and the horizontal plane is 100°.

[0018] The advantage of the present invention is that by adopting the above structure, a push rod is used as a linkage mechanism between the main contact assembly and the monitoring contact assembly, and a pull hook is provided on the push rod. When the main contact assembly is bonded, the push rod is restricted from returning to its original position, so that the pull hook of the push rod pulls the monitoring spring piece to put the monitoring contact assembly in an open state, thereby fulfilling the function of the monitoring contact assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 It is a stereoscopic diagram from the main viewing angle of a four-pole linkage electromagnetic relay with an anti-short circuit and contact adhesion monitoring function according to the present invention.

[0021] Figure 2 It is a three-dimensional diagram from an upward angle of a four-pole linkage electromagnetic relay with an anti-short circuit and contact adhesion monitoring function according to the present invention.

[0022] Figure 3 It is a front view of a four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function according to the present invention.

[0023] Figure 4 The present invention is a schematic structural diagram of a four-pole linkage electromagnetic relay with a short-circuit-resistant contact adhesion monitoring function.

[0024] Figure 5 The invention discloses a bottom view of a four-pole linkage electromagnetic relay with a short circuit resistance and a contact adhesion monitoring function.

[0025] Figure 6 It is a structural schematic diagram of a push rod, a main contact assembly and a monitoring contact assembly in a four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function of the present invention (the auxiliary static contact and the auxiliary moving contact are in a non-closed state).

[0026] Figure 7 It is a structural schematic diagram of a push rod, a main contact assembly and a monitoring contact assembly in a four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function of the present invention (the auxiliary static contact and the auxiliary moving contact are in a closed state).

[0027] Figure 8 The present invention is a schematic structural diagram of a four-pole linkage electromagnetic relay with a short-circuit-resistant contact adhesion monitoring function when the moving contact and the stationary contact are in a pre-contact state.

[0028] Fig. 9 The present invention is a schematic structural diagram of a four-pole linkage electromagnetic relay with a short-circuit-resistant contact adhesion monitoring function when the moving contact and the static contact are in a final closed state.

[0029] Fig.10 The present invention is a schematic structural diagram of a push rod and a main contact assembly in a four-pole linkage electromagnetic relay with a short-circuit-resistant contact adhesion monitoring function.

[0030] Fig.11 It is a partial structural schematic diagram of a push rod, a main contact assembly and a monitoring contact assembly in a four-pole linkage electromagnetic relay with anti-short circuit and contact adhesion monitoring function of the present invention (the moving contact and the static contact are not closed, and the auxiliary static contact and the auxiliary moving contact are in a closed state).

[0031] Fig.12 It is a partial structural schematic diagram of a push rod, a main contact assembly and a monitoring contact assembly in a four-pole linkage electromagnetic relay with anti-short circuit and contact adhesion monitoring function of the present invention (the moving contact and the static contact are in a closed state due to adhesion, and the auxiliary static contact and the auxiliary moving contact are in a non-closed state because the push rod cannot be reset).

[0032] In the figure: 1-frame, 2-iron core, 3-coil, 4-armature, 5-push rod, 6-main contact assembly, 61-moving contact, 62-static contact, 63-moving contact connecting plate, 7-monitoring contact assembly, 71-auxiliary static contact, 72-monitoring spring, 721-first part, 722-second part, 73-auxiliary moving contact, 8-hook, 9-spring. DETAILED DESCRIPTION

[0033] The four-pole linkage electromagnetic relay with anti-short circuit and contact adhesion monitoring function of the present invention comprises a frame 1, an iron core 2 arranged on the frame 1, a coil 3 sleeved on the iron core 2, an armature 4 arranged on the frame 1 to attract the iron core 2 after the coil 3 is energized, a push rod 5 arranged on the frame 1 to be linked with the armature 4 and realize left and right reciprocating motion, a main contact assembly 6 coordinated with the push rod 5, and a monitoring contact assembly 7 arranged on the frame 1 to be coordinated with the push rod 5, wherein the monitoring contact assembly 7 is in a non-closed state when the main contact assembly 6 is adhered. By adopting the above structure, the push rod 5 is used as the linkage mechanism of the main contact assembly 6 and the monitoring contact assembly 7, and the pull hook 8 arranged on the push rod 5 is used. When the main contact assembly 6 is adhered, the push rod 5 will be restricted from returning to its original position, so that the pull hook 8 of the push rod 5 will pull the monitoring spring 72 to make the monitoring contact assembly 7 in an open state, thereby playing the function of the monitoring contact assembly 7.

[0034] The main contact assembly 6 mentioned above includes a moving contact 61 arranged on the push rod 5 and a static contact 62 arranged on the frame 1. A hook 8 is arranged on the push rod 5 near the side of the monitoring contact assembly 7; the monitoring contact assembly 7 includes an auxiliary static contact 71 arranged on the frame 1, a monitoring spring 72 connected to one end of the frame 1, and an auxiliary moving contact 73 arranged at the other end of the monitoring spring 72. When the push rod 5 reciprocates left and right, the hook 8 hooks or releases the monitoring spring 72, and the corresponding auxiliary moving contact 73 and the auxiliary static contact 71 are released or closed. Fig.11 As shown, in the initial state, the auxiliary moving contact 73 and the auxiliary static contact 71 in the monitoring contact assembly 7 are closed, and the moving contact 61 and the static contact 62 in the main contact assembly 6 are separated; when the coil 3 is energized, the moving contact 61 and the static contact 62 in the main contact assembly 6 are closed, and the auxiliary moving contact 73 and the auxiliary static contact 71 in the monitoring contact assembly 7 are separated under the action of the push rod 5; Fig.12 As shown, when the coil 3 is de-energized and the moving contact 61 and the static contact 62 in the main contact assembly 6 are bonded, the push rod 5 cannot return to its initial position due to the obstruction of the contact connection bridge, thereby blocking the auxiliary moving contact 73 and the auxiliary static contact 71 in the monitoring contact assembly 7 from closing, thereby performing the function of monitoring the main contact.

[0035] The above-mentioned monitoring spring piece 72 is formed by bending a metal sheet to form a first part 721 connected to the frame 1 and a second part 722 connected to the first part 721. The auxiliary moving contact 73 is arranged on the second part 722. The hook 8 on the push rod 5 hooks or releases the monitoring spring piece 72 when it moves relative to the frame 1.

[0036] The above-mentioned four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function is provided with a plurality of main contact assemblies 6, each of which is composed of two main contact assembly assemblies 6 units arranged in parallel in series. Under the condition of large contact gap requirements and size restrictions, it is difficult to increase the contact gap h by increasing the height or length of the relay volume. By adopting the above-mentioned double-group contact series scheme, the contact gap h will be reduced to half of the original, which can significantly reduce the action distance, thereby avoiding the relay size being too long or too high, reducing the distance between the armature 4 and the iron core in the initial state, and the suction and reaction force is easier to match.

[0037] The main contact assembly 6 unit of the present invention comprises a moving contact connecting plate 63 arranged on the push rod 5, two moving contacts 61 arranged at both ends of the moving contact connecting plate 63, two static contact 62 connecting plates arranged on the frame 1, and static contacts 62 arranged on the corresponding static contact 62 plates. The moving contact 61 attracts the corresponding static contact 62 after the coil 3 is energized; the moving contact connecting plate 63 is a copper plate. The push rod 5 is provided with a slot for the moving contact connecting plate 63 to be placed, and the slot is provided with a spring 9 for connecting the push rod 5 and the moving contact connecting plate 63 respectively. Using a double-contact bridge connection method, the moving contact connecting plate 63 between the conductive parts of the two contacts is connected in series with a pure copper plate. Since the copper plate does not provide a reaction force, it is also easy to increase the conductive cross-sectional area by thickening it; the reaction force is provided by a spring 9, and the spring 9 itself is not energized, so it does not generate heat. Under a long-term high current load, the temperature will be low and the elastic force will have little effect.

[0038] The movable contact 61 of the present invention is tilted relative to the static contact 62 in the initial state. The tilt angle between the movable contact and the horizontal plane in the initial state is 95-110°, and the optimal tilt angle is 100°. When the movable contact 61 contacts the static contact 62, the tilted side contacts first, and then performs a relative sliding friction movement under the action of the contact spring 9. During the contact process, a relative friction movement is formed, which can wipe off foreign matter on the contact surface. In addition, during the relative friction movement, a contact element is formed between the contacts, which increases the conductive path of the current, thereby reducing the contact impedance.

[0039] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present application should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function, characterized in that: The four-pole linkage electromagnetic relay with anti-short circuit and contact adhesion monitoring function includes a frame, an iron core arranged on the frame, a coil sleeved on the iron core, an armature arranged on the frame and attracting the iron core after the coil is energized, a push rod arranged on the frame and linked with the armature to realize left and right reciprocating motion, a main contact assembly coordinated with the push rod, and a monitoring contact assembly arranged on the frame and coordinated with the push rod, wherein the monitoring contact assembly is in a non-closed state when the main contact assembly is adhered.

2. A four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function as claimed in claim 1, characterized in that: The main contact assembly includes a moving contact arranged on the push rod and a stationary contact arranged on the frame; A hook is provided on the push rod on one side close to the monitoring contact assembly; the monitoring contact assembly includes an auxiliary static contact arranged on the frame, a monitoring spring connected to one end of the frame, and an auxiliary moving contact arranged at the other end of the monitoring spring; when the push rod reciprocates left and right, the hook hooks or releases the monitoring spring, and the corresponding auxiliary moving contact and auxiliary static contact are released or closed.

3. A four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function as claimed in claim 2, characterized in that: The monitoring spring is formed by bending a metal sheet to form a first part connected to the frame and a second part connected to the first part. The auxiliary moving contact is arranged on the second part. The hook on the push rod hooks or releases the monitoring spring when it moves relative to the frame.

4. A four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function as claimed in claim 2, characterized in that: The four-pole linkage electromagnetic relay with anti-short circuit and contact adhesion monitoring function is provided with a plurality of main contact assemblies, each of which is composed of two main contact assembly units arranged in parallel and in series; The main contact assembly unit includes a moving contact connecting plate arranged on the push rod, two moving contacts arranged at both ends of the moving contact connecting plate, two stationary contact connecting plates arranged on the frame, and the stationary contacts arranged on the corresponding stationary contact plates. The moving contact attracts the corresponding stationary contact after the coil is energized.

5. A four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function as claimed in claim 4, characterized in that: The push rod is provided with a slot for the movable contact connecting plate to be placed therein, and the slot is provided with a spring respectively connecting the push rod and the movable contact connecting plate.

6. A four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function as claimed in claim 5, characterized in that: The moving contact connecting plate is a copper plate.

7. A four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function as claimed in claim 2, characterized in that: The movable contact is tilted relative to the static contact in an initial state.

8. A four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function as claimed in claim 7, characterized in that: In the initial state, the inclination angle between the moving contact and the horizontal plane is 95-110°.

9. A four-pole linkage electromagnetic relay with short-circuit resistance and contact adhesion monitoring function as claimed in claim 8, characterized in that: In the initial state, the inclination angle between the moving contact and the horizontal plane is 100°.

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