High voltage relay structure for temperature reduction and pressure adjustment

Abstract

The utility model relates to a relay structure. A high voltage relay structure of cooling and pressure adjustment, including the bottom plate, install the cover on the bottom plate, install the static contact piece on the cover, install the push rod structure and the movable contact piece in the cover, push rod structure drives movable contact piece axial movement, the cover forms a closed cavity, install one inside cover on the bottom plate, the inside cover separates the closed cavity into the outer cavity and the inner cavity, the position of movable contact piece and static contact piece meet is located in the outer cavity, the closed cavity of inside cover formation is the inner cavity, install at least one constant pressure valve on the inside cover. The utility model provides a high voltage relay structure of cooling and pressure adjustment of simple structure can carry out cooling and pressure reduction to high pressure chamber, prolongs the service life, reduces the failure rate, solves the technical problem that the high voltage relay of prior art can only rely on product self heat dissipation, and heat dissipation is slow, influences product service life and stability.

Description

Technical Field

[0001] This utility model relates to a relay structure, and more particularly to a high-voltage relay structure for cooling and adjusting air pressure. Background Technology

[0002] A high-voltage relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is commonly used in automatic control circuits. A high-voltage relay is an electrical device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) of the high-voltage circuit reaches a specified requirement.

[0003] Relays are common components in control circuits. They change the controlled quantity in the circuit by changing the input quantity, thereby achieving the purpose of automatic control and regulation. They are widely used in equipment such as new energy vehicles, charging piles, and power electronic energy storage stations. Especially in the field of high-voltage circuit control, relays undertake important execution tasks. Through the isolated operation of the working coil, they can realize the opening and closing actions of high-voltage circuits. Their working performance is related to the safe use of high-voltage circuits, so they need to have good current breaking capacity and overload performance.

[0004] Currently, high-voltage relays experience significant temperature rise under high loads, leading to material aging, increased contact resistance, and limited current carrying capacity. Long-term operation necessitates derating (e.g., a nominal 300A relay can only continuously carry 250A). Relay cooling primarily relies on natural heat dissipation and internal gas cooling. This results in suboptimal temperature control, reduced product lifespan, and increased contact resistance. Utility Model Content

[0005] This utility model provides a high-voltage relay structure that is simple in structure, can cool and depressurize the high-voltage chamber, extend service life, and reduce failure rate; it solves the technical problem in the prior art that high-voltage relays can only rely on the product itself for heat dissipation, which is slow and affects the product's service life and stability.

[0006] The above-mentioned technical problem of this utility model is solved by the following technical solution: a high-pressure relay structure for cooling and adjusting air pressure, including a base plate, a cover mounted on the base plate, a stationary contact mounted on the cover, a push rod structure and a moving contact plate mounted inside the cover, the push rod structure driving the moving contact plate to move axially, a sealed cavity formed inside the cover, an inner cover mounted on the base plate, the inner cover separating the sealed cavity into an outer cavity and an inner cavity, the position where the moving contact plate contacts the stationary contact is located in the outer cavity, the sealed cavity formed by the inner cover is the inner cavity, and at least one constant pressure valve is mounted on the inner cover. When the high-voltage relay closes and carries a large current, the moving contact connects with the stationary contact. The temperature at the point of contact rises, causing the temperature inside the outer cavity to rise synchronously, thus increasing the pressure inside the outer cavity. At this time, the pressure inside the inner cavity is lower than that inside the outer cavity. Therefore, this will push the constant pressure valve on the inner cover, allowing hydrogen gas inside the outer cavity inside the ceramic cover to flow into the inner cavity. This removes some heat and adds a heat convection function to the traditional heat conduction, thereby reducing the product's temperature rise.

[0007] Preferably, the cross-section of the inner cover is the same as that of the outer shell, and a push rod through hole is provided at the center of the inner cover. The inner cavity is annular. The push rod through hole accommodates the push rod structure passing through it, and the inner cover is laid on the base plate as large as possible to achieve a balance between high and low pressure.

[0008] Preferably, the constant pressure valve is installed on the side of the inner cover for easy arrangement.

[0009] Preferably, the inner cover is coated with a heat insulation layer. This ensures low pressure and low temperature within the inner cavity, minimizing the influence of the outer cavity and thus achieving better pressure and temperature reduction.

[0010] Preferably, there are two constant pressure valves, and the two constant pressure valves are located in the same plane.

[0011] Preferably, the constant pressure valve includes a valve body fixed on an inner cover, a valve core inside the valve body, the valve core including a valve stem and a plug, a stop block fixed at the end of the valve stem, a spring sleeved on the valve stem, the two ends of the spring abutting against the stop block and the valve body respectively, and a sealing ring between the plug and the valve body.

[0012] Preferably, the inner cover is a cuboid with a bottom surface, and the inner wall of the cover is formed with reinforcing ribs that abut against the upper surface of the inner cover. Inner cover reinforcing ribs are formed on both sides of the inner cover and abut against the inner wall of the cover.

[0013] Therefore, the high-voltage relay structure for cooling and adjusting air pressure of this utility model has the following advantages:

[0014] 1. Controlling the product's temperature can improve the reliability of the high-voltage relay and extend its service life.

[0015] 2. Low temperature rise can avoid oxidation of moving and stationary contacts, ensuring the stability of relay contact resistance.

[0016] 3. Enhanced current carrying capacity: Higher load density allows the relay to carry a larger current in the same volume, or to operate at full load for a long time without overheating, adapting to the needs of high-power applications (such as new energy charging piles and industrial motors). Attached Figure Description

[0017] Figure 1 This is a three-dimensional diagram of a high-voltage relay structure that cools and adjusts air pressure.

[0018] Figure 2 yes Figure 1 A sectional view.

[0019] Figure 3 yes Figure 1 A three-dimensional view of the inner cover.

[0020] Figure 4 yes Figure 2 Enlarged view of point A in the middle.

[0021] Figure 5 This is a three-dimensional sectional view of Example 2. Detailed Implementation

[0022] The technical solution of the utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0023] Example:

[0024] like Figure 1 and 2 As shown, a high-voltage relay structure for cooling and adjusting air pressure includes a base plate 1, and a rectangular ceramic housing 2 mounted on top of the base plate 1. Two cylindrical stationary contacts 3 are mounted on the upper end of the housing 2.

[0025] A push rod structure is installed at the center of the housing 2. The push rod structure includes a moving iron core 9 located below the base plate, a push rod 10 installed inside the moving iron core 9, and a contact spring 11 and a moving contact piece 7 sleeved on the push rod 10.

[0026] A sealed cavity is formed inside the housing 2. An inner cover 4 is also installed on the base plate. The inner cover 4 is located inside the housing 2 and is adhered to the base plate. The inner cover 4 separates the sealed cavity inside the housing 2 into an outer cavity 5 and an inner cavity 6. The position where the moving contact 7 contacts the stationary contact 3 is in the outer cavity 5, and the cavity formed by the inner cover 4 is the inner cavity 6.

[0027] like Figure 3As shown, the inner cover 4 has a cuboid structure, with a push rod through hole 12 at its center for the push rod structure to pass through. An annular inner cavity 6 is formed inside the inner cover. A heat insulation layer is coated on the inner cover 4 to separate the inner cavity 6 from the outer cavity 5.

[0028] like Figure 4 As shown, a constant pressure valve 8 is installed on each of the two sides of the inner cover 4. The axes of the two constant pressure valves 8 are on the same straight line. The constant pressure valve 8 includes a valve body 13 fixed to the inner cover 4 by injection molding or glue. A coaxial valve core is installed inside the valve body 13. The valve core includes an integrally formed valve stem 17 and a plug 16. A stop block 18 is fixed to one end of the valve stem. A spring 14 is sleeved on the valve stem. One end of the spring 14 abuts against the stop block 18, and the other end of the spring abuts against the valve body 13. The plug is 16-point conical, and a sealing ring 15 is provided between the plug 16 and the valve body 13.

[0029] During use, the push rod structure drives the moving contact to move upward, so that the moving contact and the stationary contact come into contact. When a large current passes through, the contact point between the moving contact and the stationary contact heats up rapidly, which increases the pressure in the outer cavity. There is a pressure difference between the inner and outer cavities, which causes the high-pressure gas in the outer cavity to compress the spring, open the constant pressure valve, and flow towards the low-pressure direction in the inner cavity, thus forming a gas flow. This carries away the heat and reduces the pressure in the outer cavity, playing a role in pressure relief and explosion prevention.

[0030] Example 2:

[0031] like Figure 5 As shown, unlike Embodiment 1, the inner cover 4 is a hexagonal cuboid. Reinforcing ribs 20 are formed on two sides of the inner cover 4, and these reinforcing ribs 20 abut against the inner wall of the housing 2. Reinforcing ribs 19 are formed on the inner wall of the ceramic housing 2, and these reinforcing ribs 19 abut against the upper surface of the inner cover 4. Thus, the reinforcing ribs 19 on the inner wall of the housing limit the axial direction of the inner cover 4, and the reinforcing ribs 20 limit the horizontal direction of the inner cover 4, thereby fixing the inner cover 4 inside the housing 2.

[0032] The specific embodiments described herein are merely illustrative examples of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A high-voltage relay structure for cooling and regulating air pressure, comprising a base plate, a housing mounted on the base plate, a stationary contact mounted on the housing, and a push rod structure and a moving contact plate installed inside the housing, the push rod structure driving the moving contact plate to move axially, characterized in that: The enclosure forms a sealed cavity, and an inner cover is installed on the bottom plate. The inner cover separates the sealed cavity into an outer cavity and an inner cavity. The position where the moving contact and the stationary contact are in contact is located in the outer cavity. The sealed cavity formed by the inner cover is the inner cavity, and at least one constant pressure valve is installed on the inner cover.

2. The high-voltage relay structure for cooling and adjusting air pressure according to claim 1, characterized in that: The inner cover has the same cross-section as the outer cover, and a push rod through hole is provided in the center of the inner cover. The inner cavity is annular.

3. The high-voltage relay structure for cooling and adjusting air pressure according to claim 1, characterized in that: The constant pressure valve is installed on the side of the inner cover.

4. The high-voltage relay structure for cooling and adjusting air pressure according to claim 1, 2, or 3, characterized in that: The inner cover is coated with a heat insulation layer.

5. The high-voltage relay structure for cooling and adjusting air pressure according to claim 1, 2, or 3, characterized in that: There are two constant pressure valves, and the two constant pressure valves are located in the same plane.

6. The high-voltage relay structure for cooling and adjusting air pressure according to claim 1, 2, or 3, characterized in that: The constant pressure valve includes a valve body fixed on an inner cover. A valve core is provided inside the valve body. The valve core includes a valve stem and a plug. A stop block is fixed to the end of the valve stem. A spring is sleeved on the valve stem. The two ends of the spring abut against the stop block and the valve body, respectively. A sealing ring is provided between the plug and the valve body.

7. The high-voltage relay structure for cooling and adjusting air pressure according to claim 1, 2, or 3, characterized in that: The inner cover is a cuboid with a bottom surface. Reinforcing ribs are formed on the inner wall of the cover and abut against the upper surface of the inner cover. Inner cover reinforcing ribs are formed on both sides of the inner cover and abut against the inner wall of the cover.

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