High voltage vacuum relay

Abstract

The present invention discloses a high-voltage vacuum relay, wherein an upper sleeve is arranged at the upper end of the vacuum chamber, a magnetic drive mechanism is arranged in the upper sleeve, a sliding part in the magnetic drive mechanism is sealed and extended into the vacuum chamber, and a moving contact is arranged at the lower end thereof, a static contact aligned with the moving contact is arranged in the vacuum chamber, and the static contact is connected to a terminal arranged on the surface of the vacuum chamber. In the present invention, the insulation performance is good and the oxidation problem will not occur, and the electric arc in the vacuum is easy to diffuse, and it is not easy to cause the wear of the contacts, and it also has the advantages of high electrical strength, large rated carrying current and conversion current, small contact resistance, stable operation, etc.; through the mutual cooperation of the above structures, the ablation problem of the moving and static contacts caused by the electric arc is solved, and the problem of the low voltage resistance level of the traditional relay is solved. It is a relay device with a small volume and safe to use, which meets the requirements of the high voltage level for charging piles and 5G base stations.

Description

Technical Field

[0001] The invention belongs to the technical field of high-voltage relay structure improvement, in particular to a high-voltage vacuum relay. Background Art

[0002] Relay is a commonly used switching device, which realizes the conduction and cutoff of the circuit through the contact and separation between the moving contact and the static contact. It is widely used in low-voltage and high-voltage circuit equipment. With the development of electric vehicles and 5G, corresponding charging piles and 5G base stations are also built in large quantities, and the required contactor or relay voltage level is getting higher and higher. The current required voltage level reaches 3kV. The primary circuit voltage level of traditional nitrogen, radon and other gas-filled contactors or relays is usually below 600V. Due to their low gas insulation performance, they are increasingly unable to meet the needs of high-voltage charging piles and 5G base stations. Summary of the invention

[0003] The purpose of the present invention is to provide a high-voltage vacuum relay structure in view of the fact that the existing relay structure cannot meet the high voltage requirements. Its primary control circuit is placed in a vacuum chamber, and the excellent insulation and arc extinguishing properties of the vacuum medium are utilized to greatly improve the insulation and arc extinguishing properties of its primary control circuit. At the same time, a matching new structure of closing electromagnet is designed to meet its closing requirements, which can meet the high voltage level requirements of 1kV and above for existing charging piles and 5G base stations.

[0004] The technical solution adopted by the present invention is:

[0005] A high-voltage vacuum relay, characterized in that it includes an upper sleeve, a vacuum chamber and a magnetic drive mechanism, wherein the upper sleeve is arranged at the upper end of the vacuum chamber, and the magnetic drive mechanism is arranged in the upper sleeve, and a moving contact is arranged at the lower end of the sliding component in the magnetic drive mechanism that extends into the vacuum chamber in a sealed manner, and a static contact aligned with the moving contact is arranged in the vacuum chamber, and the static contact is connected to a terminal arranged on the surface of the vacuum chamber.

[0006] Preferably, the magnetic drive mechanism includes a closing electromagnet, an operating iron, a contact spring and a sliding component. The closing electromagnet is arranged at the upper end of the upper sleeve and the operating iron is arranged at the recessed part of the upper end surface. The lower end of the operating iron extends into a cavity arranged in the closing electromagnet. The contact spring arranged inside the lower end of the operating iron is sleeved on the upper end of the sliding component. A vacuum bellows mechanism is sleeved on the outer edge of the lower end of the sliding component. The upper end of the vacuum bellows mechanism is sealed and movably arranged on the sliding component, and the lower end of the vacuum bellows mechanism is sealed and connected to the vacuum chamber.

[0007] Preferably, the vacuum bellows mechanism includes a sealing cover and a bellows, both of which are mounted on the outer edge of the sliding component below the closing electromagnet, the sealing cover is sealingly installed at the upper opening of the bellows, the lower opening of the bellows is embedded in the upper end surface of the vacuum chamber, and the bellows is in a vacuum state.

[0008] Preferably, the sliding component is a pull rod, the upper end of the pull rod extends from the lower end of the closing electromagnet into the closing electromagnet and extends to the upper end inside the lower end of the operating iron to be fitted with the contact spring, the sealing cover and the bellows are fitted on the outer edge of the pull rod located below the closing electromagnet, and the lower end of the pull rod is sealed and extends into the vacuum chamber and the moving contact is installed.

[0009] Preferably, the lower end of the pull rod below the bellows is sealed and slidably installed in a limiting ring embedded in the upper end surface of the vacuum chamber, and the moving contact is installed on the lower end of the pull rod through an insulating ring.

[0010] Preferably, a return spring is sleeved outside the bellows.

[0011] Preferably, an auxiliary contact mechanism linked to the pull rod is provided in the upper sleeve, and the auxiliary contact mechanism is used to detect whether the moving contact and the static contact are in normal contact.

[0012] Preferably, the auxiliary contact mechanism includes an auxiliary contact mounting plate, a guide column, a contact ring and an auxiliary contact, the auxiliary contact mounting plate is movably sleeved on the outer edge of the pull rod, the guide column is mounted on the upper end surface of the vacuum chamber and its upper end is passed through the auxiliary contact mounting plate, at least one auxiliary contact is arranged on the auxiliary contact mounting plate beside the guide column, and the outer edge of the guide column located below the auxiliary contact mounting plate is sleeved with a contact ring aligned with the auxiliary contact.

[0013] Preferably, the vacuum chamber comprises a metallized ceramic shell and a packaging cover plate, the packaging cover plate is arranged at the upper opening of the metallized ceramic shell, and the cavity is in a vacuum state after the two are buckled together; static contacts are arranged on both sides of the inner bottom surface of the metallized ceramic shell, and the static contacts are connected to the terminals arranged on the bottom surface of the metallized ceramic shell.

[0014] The present invention has the following beneficial technical effects:

[0015] In the present invention, the moving contact and the static contact are sealed in a vacuum chamber, with good insulation performance and no oxidation problem. Moreover, the electric arc in the vacuum can easily diffuse and is not easy to cause contact wear. It also has the advantages of high electrical strength, large rated load current and conversion current, small contact resistance, stable operation, etc. The magnetic drive mechanism is arranged outside the vacuum chamber, with a compact structure and high integration. The auxiliary contact mechanism can detect the switching and closing states of the moving and static contacts. Through the mutual cooperation of the above-mentioned structures, the ablation problem of the moving and static contacts caused by the electric arc is solved, and the problem of low voltage resistance level of traditional relays is solved. The relay device is small in size and safe to use, which meets the high voltage level requirements for charging piles and 5G base stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention:

[0017] Figure 2 yes Figure 1 Right side view (without upper sleeve);

[0018] Figure 3 yes Figure 2 AA cross-section view. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] A high voltage vacuum relay, such as Figure 1-3 As shown, the innovation of the present invention lies in: comprising an upper sleeve 1, a vacuum chamber 2 and a magnetic drive mechanism, wherein the upper sleeve is arranged at the upper end of the vacuum chamber, and the magnetic drive mechanism is arranged in the upper sleeve, and a moving contact 28 is arranged at the lower end of the sliding component in the magnetic drive mechanism that is sealed and extends into the vacuum chamber, and a static contact 27 aligned with the moving contact is arranged in the vacuum chamber, and the static contact is connected to a terminal 3 arranged on the surface of the vacuum chamber.

[0021] The magnetic drive mechanism includes a closing electromagnet, an operating iron 14, a contact spring 15 and a sliding component. The closing electromagnet is arranged at the upper end of the upper sleeve and is fixedly connected to the upper end surface of the upper sleeve by multiple screws. The operating iron is arranged at the recess 18 on the upper end surface of the upper sleeve. The lower end 17 of the operating iron extends into the cavity 21 set in the closing electromagnet. The contact spring arranged inside the lower end of the operating iron is sleeved on the shoulder 19 of the upper end of the sliding component. A vacuum bellows mechanism is sleeved on the outer edge of the lower end of the sliding component. The upper end of the vacuum bellows mechanism is sealed and movably arranged on the sliding component, and the lower end of the vacuum bellows mechanism is sealed and connected to the vacuum chamber.

[0022] The structure of the closing electromagnet is: it includes a static iron core 24, a coil 13 and a yoke 25 sleeved outside the coil, an operating iron is placed in the depression above the yoke, the yoke outside the depression is fixed to the upper sleeve by screws, a static iron core is arranged at the lower end of the yoke, and a cylindrical protrusion 22 of the static iron core extends into the interior of the coil frame 20, and a gap is reserved between the upper end surface of the cylindrical protrusion and the bottom surface of the lower end of the operating iron, and the gap is used for the operating iron to slide vertically downward.

[0023] The vacuum bellows mechanism includes a sealing cover 23 and a bellows 10. Both the sealing cover and the bellows are mounted on the outer edge of the sliding component below the closing electromagnet. The sealing cover is sealed at the upper opening of the bellows, and the lower opening of the bellows is embedded in the upper end surface of the vacuum chamber. The bellows is in a vacuum state.

[0024] The sliding component is a pull rod 16, the upper end of the pull rod extends from the lower end of the closing electromagnet into the closing electromagnet and extends to the upper end of the lower end of the operating iron, and the contact spring is mounted. The seal cover and the bellows are mounted on the outer edge of the pull rod below the closing electromagnet, and the lower end of the pull rod is sealed and extends into the vacuum chamber and the moving contact is installed. The lower end of the pull rod below the bellows is sealed and slidably installed in the limit ring 29 embedded in the upper end face of the vacuum chamber, and the moving contact is installed at the lower end of the pull rod through the insulating ring 30. The limit ring and the insulating ring are both made of insulating ceramic materials. The upper end of the limit ring is vacuum-sealed and fixed on the upper end face of the vacuum chamber inside the lower end opening of the bellows, and the lower end of the limit ring extends into the vacuum chamber.

[0025] An auxiliary contact mechanism linked with the sliding component is arranged in the upper sleeve, and the auxiliary contact mechanism is used to detect whether the moving contact and the static contact are in normal contact. The specific structure is: the auxiliary contact mechanism includes an auxiliary contact mounting plate 7, a guide column 6, a contact ring 8 and an auxiliary contact 5, the auxiliary contact mounting plate is movably sleeved on the outer edge of the pull rod, the guide column is mounted on the upper end surface of the vacuum chamber and its upper end is inserted into the auxiliary contact mounting plate, two auxiliary contacts are arranged on the auxiliary contact mounting plate beside the guide column, the outer edge of the guide column located below the auxiliary contact mounting plate is sleeved with a contact ring aligned with the auxiliary contact, and the outer edge of the guide column below the contact ring is sleeved with a spring. When the pull rod moves downward, it will drive the auxiliary contact mounting plate to move downward. When the moving and static contacts are in contact, the auxiliary contact contacts the contact ring to connect the auxiliary detection circuit, so that the outside world can judge whether the moving and static contacts are in normal contact; on the contrary, when the pull rod moves upward, the auxiliary contact and the contact ring are separated.

[0026] The vacuum chamber includes a metallized ceramic shell 26 and a packaging cover plate 12. The upper end opening of the metallized ceramic shell is provided with the packaging cover plate. After the two are buckled together, the cavity 31 is in a vacuum state. Static contacts are provided on both sides of the bottom surface of the metallized ceramic shell, and the static contacts are connected to the terminals provided on the bottom surface of the metallized ceramic shell. An insulating holder 11 is provided on the upper end surface of the packaging cover plate beside the bellows and the guide column.

[0027] The metallized porcelain shell, packaging cover plate, bellows, sealing cover, moving contact, static contact, terminal, limit ring, insulating ring and pull rod are brazed into a whole, and then the closing electromagnet, insulating retainer, auxiliary contact mounting plate, spring, guide column, auxiliary contact, contact ring, reset spring and contact spring are installed, and then the control line and power line of the closing electromagnet and auxiliary contact are led out, and finally the whole is plastic-sealed.

[0028] The above structures cooperate with each other to form a normally closed high-voltage vacuum relay, and its working process is: in the normally closed state, the bellows generates a self-closing force and compresses under the action of atmospheric pressure, driving the pull rod to move downward and push the moving contact and the static contact to contact, forming a normally closed state of the moving and static contacts. In the normally closed state, the power supply of the closing electromagnet is turned on, and the magnetic force generated by the power-on causes the operating iron to attract the pull rod to rise, and the pull rod drives the moving contact to separate from the static contact, and the normally closed state is converted to the cut-off state. In the cut-off state, the power is cut off, and the pull rod descends under the contraction of the bellows, so that the moving and static contacts are re-contacted, and the cut-off state is converted to the normally closed state.

[0029] In addition to the normally closed high-voltage vacuum relay, a normally open high-voltage vacuum relay can be formed, specifically, a reset spring 9 is installed outside the bellows, and its function is as follows: in the normally open state, the elastic force of the reset spring offsets the self-closing force of the bellows caused by atmospheric pressure, and the pull rod keeps the moving contact and the static contact separated. In the normally open state, the power supply of the closing electromagnet is turned on, and the magnetic force generated by the power-on causes the operating iron to move downward, the reset spring is compressed, and the contact spring is compressed. When the lower end of the operating iron is attracted by the cylindrical protrusion of the static iron core, the pull rod drives the moving contact to stably contact the static contact, and the normally open state is converted to the closed state. In the closed state, the power is cut off, and the pull rod moves upward under the action of the reset spring and the contact spring, so that the moving and static contacts are separated, and the closed state is converted to the normally open state.

[0030] In the present invention, the moving contact and the static contact are sealed in a vacuum chamber, with good insulation performance and no oxidation problem. Moreover, the electric arc in the vacuum can easily diffuse and is not easy to cause contact wear. It also has the advantages of high electrical strength, large rated load current and conversion current, small contact resistance, stable operation, etc. The magnetic drive mechanism is arranged outside the vacuum chamber, with a compact structure and high integration. The auxiliary contact mechanism can detect the switching and closing states of the moving and static contacts. Through the mutual cooperation of the above-mentioned structures, the ablation problem of the moving and static contacts caused by the electric arc is solved, and the problem of low voltage resistance level of traditional relays is solved. The relay device is small in size and safe to use, which meets the high voltage level requirements for charging piles and 5G base stations.

Claims

1. A high voltage vacuum relay, Features: It comprises an upper sleeve, a vacuum chamber and a magnetic drive mechanism, wherein the upper sleeve is arranged at the upper end of the vacuum chamber, the magnetic drive mechanism is arranged in the upper sleeve, a moving contact is arranged at the lower end of the sliding component in the magnetic drive mechanism that extends into the vacuum chamber in a sealed manner, a stationary contact aligned with the moving contact is arranged in the vacuum chamber, and the stationary contact is connected to a terminal arranged on the surface of the vacuum chamber; The magnetic drive mechanism includes a closing electromagnet, an operating iron, a contact spring and a sliding component. The closing electromagnet is arranged at the upper end of the upper sleeve and the operating iron is arranged at the concave part of the upper end surface. The lower end of the operating iron extends into the cavity arranged in the closing electromagnet. The contact spring arranged inside the lower end of the operating iron is sleeved on the upper end of the sliding component. A vacuum bellows mechanism is sleeved on the outer edge of the lower end of the sliding component. The upper end of the vacuum bellows mechanism is sealed and rotatably arranged on the sliding component. The lower end of the vacuum bellows mechanism is sealed and connected to the vacuum chamber. The vacuum bellows mechanism comprises a sealing cover and a bellows, the sliding component is a pull rod, the upper end of the pull rod extends from the lower end of the closing electromagnet into the closing electromagnet and extends to the upper end of the lower end of the operating iron to cover the contact spring, the outer edge of the pull rod located below the closing electromagnet is covered with the sealing cover and the bellows, the lower end of the pull rod is sealed and extends into the vacuum chamber and the moving contact is installed; An auxiliary contact mechanism linked to the pull rod is arranged in the upper sleeve, and the auxiliary contact mechanism is used to detect whether the moving contact and the static contact are in normal contact; The auxiliary contact mechanism includes an auxiliary contact mounting plate, a guide column, a contact ring and an auxiliary contact. The auxiliary contact mounting plate is movably sleeved on the outer edge of the pull rod. The guide column is mounted on the upper end surface of the vacuum chamber and its upper end is penetrated into the auxiliary contact mounting plate. At least one auxiliary contact is arranged on the auxiliary contact mounting plate beside the guide column. The outer edge of the guide column located below the auxiliary contact mounting plate is sleeved with a contact ring aligned with the auxiliary contact.

2. A high voltage vacuum relay according to claim 1, Features: The sealing cover and the bellows are both mounted on the outer edge of the sliding component below the closing electromagnet. The sealing cover is sealed at the upper opening of the bellows, and the lower opening of the bellows is embedded in the upper end surface of the vacuum chamber. The bellows is in a vacuum state.

3. A high voltage vacuum relay according to claim 2, Features: The lower end of the pull rod below the bellows is sealed and slidably installed in a limiting ring embedded in the upper end surface of the vacuum chamber, and the moving contact is installed at the lower end of the pull rod through an insulating ring.

4. A high voltage vacuum relay according to claim 1, 2 or 3, Features: A return spring is sleeved outside the bellows.

5. A high voltage vacuum relay according to claim 4, Features: The vacuum chamber comprises a metallized ceramic shell and a packaging cover plate. The packaging cover plate is arranged at the upper opening of the metallized ceramic shell. When the two are buckled together, the cavity is in a vacuum state. Static contacts are arranged on both sides of the bottom surface of the metallized ceramic shell, and the static contacts are connected to the terminals arranged on the bottom surface of the metallized ceramic shell.

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