High-voltage relay structure capable of cooling and adjusting air pressure

Abstract

The invention relates to a relay structure. A high-voltage relay structure capable of cooling and adjusting air pressure comprises a bottom plate, a cover shell installed on the bottom plate, a static contact piece installed on the cover shell, a push rod structure and a movable contact piece installed in the cover shell, the push rod structure drives the movable contact piece to move axially, a closed cavity is formed in the cover shell, and an inner cover is installed on the bottom plate. The inner cover divides the closed cavity into an outer cavity and an inner cavity, the position where the movable contact piece is connected with the static contact piece is located in the outer cavity, the closed cavity formed by the inner cover is the inner cavity, and at least one constant pressure valve is installed on the inner cover. The high-voltage relay structure capable of cooling and adjusting air pressure is simple in structure, and can cool and depressurize the high-voltage cavity, prolong the service life and reduce the failure rate. The technical problems that the high-voltage relay in the prior art can only depend on the product to dissipate heat, the heat dissipation is slow, and the service life and the stability of the product are influenced are solved.

Description

Technical Field

[0001] The present invention relates to a relay structure, in particular to a high-voltage relay structure for cooling and adjusting air pressure. Background Art

[0002] A high-voltage relay is an electronic control device with a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits. When the input quantity (excitation quantity) of the high-voltage circuit changes to a specified level, a high-voltage relay causes a predetermined step change in the controlled quantity in the electrical output circuit.

[0003] Relays are commonly used components in control circuits. They change the controlled quantity in the circuit by changing the input quantity, achieving the purpose of automatic control and regulation. They are widely used in new energy vehicles, charging piles, power electronic energy storage stations and other equipment. Especially in the control field of high-voltage circuits, relays undertake important execution tasks. Through the isolated operation of the working coil, the high-voltage circuit can be closed and disconnected. Their working performance is related to the safe use of the high-voltage circuit, so they need to have good current cutting capability 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 requires derating (for example, a nominal 300A current can only continuously carry 250A). Relay cooling relies primarily on natural heat dissipation and internal gas cooling, resulting in suboptimal temperature control, reduced product lifespan, and increased contact resistance. Summary of the Invention

[0005] The present invention provides a high-voltage relay structure for cooling and adjusting air pressure, which has a simple structure and can cool and reduce the pressure of the high-voltage chamber, extend the service life, and reduce the failure rate; it solves the technical problem in the prior art that high-voltage relays can only rely on the product itself to dissipate heat, which is slow and affects the service life and stability of the product.

[0006] The above technical problems of the present invention are solved by the following technical solutions: a high-voltage relay structure for cooling and adjusting air pressure, comprising a base plate, a cover shell installed on the base plate, a static contact installed on the cover shell, a push rod structure and a moving contact piece installed in the cover shell, the push rod structure drives the moving contact piece to move axially, a closed cavity is formed in the cover shell, an inner cover is installed on the base plate, the inner cover isolates the closed cavity into an outer cavity and an inner cavity, the position where the moving contact piece and the static contact piece are connected is located in the outer cavity, the closed cavity formed by the inner cover is the inner cavity, and at least one constant pressure valve is installed on the inner cover. When the high-voltage relay is closed and passes a large current, the moving contact is connected to the static contact, and the temperature at the junction of the moving contact and the static contact rises, causing the temperature in the outer cavity to rise synchronously, thereby increasing the pressure in the outer cavity. At this time, the pressure in the inner cavity is lower than that in the outer cavity. Therefore, the constant pressure valve on the inner cover will be pushed, allowing the hydrogen in the outer cavity inside the ceramic cover to flow into the inner cavity, taking away some heat while adding a heat convection function on the basis of traditional heat conduction to achieve the function of reducing the temperature rise of the product.

[0007] Preferably, the inner cover has a cross-section that is the same as that of the housing, a push rod through hole is provided at the center of the inner cover, and the inner cavity is annular. The push rod through hole accommodates the push rod structure therethrough, and the inner cover is laid as far as possible on the bottom plate to achieve a balance between high and low pressures.

[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-insulating layer to ensure low pressure and low temperature in the inner cavity, which is less affected by the outer cavity as possible, thereby 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, which is fixed on the inner cover. A valve core is provided in 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 are respectively abutted against the stop block and the valve body. A sealing ring is provided between the plug and the valve body.

[0012] Preferably, the inner cover is a rectangular parallelepiped with a bottom surface, and reinforcing ribs are formed on the inner wall of the cover shell, which abut against the upper end surface of the inner cover. Inner cover reinforcing ribs are formed on both side surfaces of the inner cover, which abut against the inner wall of the cover shell.

[0013] Therefore, the high-voltage relay structure for cooling and adjusting air pressure of the present invention has the following advantages: 1. When the temperature of the product is controlled, the reliability of the high-voltage relay can be improved and the service life can be extended.

[0014] 2. Low temperature rise can avoid oxidation of the moving and static contacts, ensuring the stability of the relay contact resistance.

[0015] 3. Enhanced current carrying capacity: Higher load density allows the relay to carry larger currents in the same volume, or operate at full load for a long time without overheating, adapting to high-power application requirements (such as new energy charging piles and industrial motors). BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the structure of a high-voltage relay for cooling and adjusting air pressure.

[0017] Figure 2 yes Figure 1 sectional view of .

[0018] Figure 3 yes Figure 1 A three-dimensional view of the inner cover.

[0019] Figure 4 yes Figure 2 Enlarged view of point A in the middle.

[0020] Figure 5 This is a three-dimensional cross-sectional view of Example 2. DETAILED DESCRIPTION

[0021] The technical solution of the invention is further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0022] Example: like Figure 1 and 2 As shown, a high-voltage relay structure for cooling and adjusting air pressure includes a base plate 1, a rectangular ceramic cover 2 is installed above the base plate 1, and two cylindrical static contacts 3 are installed on the upper end of the cover 2.

[0023] A push rod structure is installed in the center of the housing 2. The push rod structure includes a moving iron core 9 located below the bottom plate, a push rod 10 is installed in the moving iron core 9, and a contact spring 11 and a moving contact piece 7 are sleeved on the push rod 10.

[0024] A sealed cavity is formed within the housing 2. An inner cover 4 is also mounted on the base plate. This inner cover 4 is located within the housing 2 and bonded to the base plate. The inner cover 4 separates the sealed cavity within the housing 2 into an outer cavity 5 and an inner cavity 6. The location where the moving contact 7 and the stationary contact 3 meet is within the outer cavity 5, while the cavity formed by the inner cover 4 forms the inner cavity 6.

[0025] like Figure 3 As shown, the inner cover 4 is a rectangular parallelepiped structure with a push rod through hole 12 at the center thereof for the push rod structure to pass through. An annular inner cavity 6 is formed within the inner cover. A heat-insulating layer is applied to the inner cover 4 to separate the inner cavity 6 from the outer cavity 5.

[0026] like Figure 4 As shown, a constant pressure valve 8 is installed on each side of the inner cover 4. The axes of the two constant pressure valves 8 are located on the same straight line. The constant pressure valve 8 includes a valve body 13 fixed to the inner cover. The valve body 13 can be fixed to the inner cover 4 by injection molding or glue. A coaxial valve core is installed in 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 the stop block 18, and the other end of the spring abuts the valve body 13. The plug is conical 16, and a sealing ring 15 is provided between the plug 16 and the valve body 13.

[0027] When in use, the push rod structure drives the moving contact piece to move upward, so that the moving contact piece and the static contact piece come into contact. When a large current passes through, the contact point between the moving contact piece and the static contact piece heats up rapidly, thereby causing the pressure in the outer cavity to increase. There is a pressure difference between the inner cavity and the outer cavity, allowing the high-pressure gas in the outer cavity to compress the spring, open the constant pressure valve, and flow toward the low-pressure direction of the inner cavity, thereby forming gas flow, taking away heat while reducing the pressure in the outer cavity, playing a role in pressure relief and explosion prevention.

[0028] Example 2: like Figure 5 As shown, unlike Example 1, the inner cover 4 is a six-sided cuboid, with inner cover reinforcement ribs 20 formed on two side surfaces of the inner cover 4, which abut against the inner wall of the cover shell 2. Reinforcement ribs 19 are formed on the inner wall of the ceramic cover shell 2, which abut against the upper end face of the inner cover 4. The reinforcement ribs 19 on the inner wall of the cover shell limit the inner cover 4 in the axial direction, and the inner cover reinforcement ribs 20 limit the inner cover 4 in the horizontal direction, thereby fixing the inner cover 4 in the cover shell 2.

[0029] The specific embodiments described herein are merely illustrative of the concepts of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A high-voltage relay structure for cooling and adjusting air pressure, comprising a base plate, a housing mounted on the base plate, a static contact mounted on the housing, a push rod structure and a moving contact piece mounted within the housing, the push rod structure driving the moving contact piece to move axially, and characterized by: A closed cavity is formed inside the cover shell, and an inner cover is installed on the bottom plate. The inner cover isolates the closed cavity into an outer cavity and an inner cavity. The position where the moving contact piece and the static contact piece meet is located in the outer cavity. The closed 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 cross section of the inner cover is the same as that of the cover shell. A push rod through hole is provided at the center of the inner cover, and 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. A 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. A 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. A 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, which is fixed on the inner cover. A valve core is provided in 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 respectively abut the stop block and the valve body. A sealing ring is provided between the plug and the valve body.

7. A 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 rectangular parallelepiped with a bottom surface. The inner wall of the cover shell is formed with reinforcing ribs, which abut against the upper end surface of the inner cover. Inner cover reinforcing ribs are formed on both side surfaces of the inner cover, which abut against the inner wall of the cover shell.

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