A sliding electrode applied to a resistance high-temperature heating device

Abstract

The application discloses a sliding electrode applied to a resistance high-temperature heating device and belongs to the field of sliding electrode switches. The sliding electrode comprises a fixed electrode, an electrode ring, an electrode ring fixing member and a sliding member. The electrode ring is a circular ring body and has a single-side axial slit to adapt to the radial thermal expansion of the sliding member. The electrode ring is installed in a fixed electrode groove with a radial expansion space. The electrode ring fixing member is used for limiting the position of the electrode ring in the fixed electrode. The radial minimum gap between the fixed electrode and the electrode ring is smaller than the radial minimum gap between the fixed electrode, the electrode ring fixing member and the sliding member. The sliding member is supported on the electrode ring and does not directly contact the fixed electrode and the electrode ring fixing member. The application guarantees the axial conduction between the electrode ring and the fixed electrode and the electrode ring fixing member, and makes the thermal expansion direction of the sliding member and the current entering direction deviate from each other, so that the radial conduction contact between the electrode ring and the fixed electrode is close and the thermal expansion space is left, and the sliding electrode is prevented from being stuck under the high-temperature condition.

Description

TECHNICAL FIELD

[0001] The present application relates to a sliding electrode, in particular to a sliding electrode for a resistive high-temperature heating device in which current directly passes through a heating element, the resistive high-temperature heating device comprising a high-temperature blackbody radiation source and a high-temperature resistance furnace, and belongs to the field of sliding electrode switches. BACKGROUND

[0002] With the continuous development of aerospace, material chemical industry and other industries, the temperature range faced in thermal test, heat treatment, thermal processing and thermal metrology test is becoming larger and larger, and the upper limit of temperature breaks through 3500K, which puts forward higher requirements for heat source, high-temperature furnace and other related devices.

[0003] In order to achieve higher temperature, the heating element can be selected from high-melting-point materials such as graphite, and the positive and negative electrodes for conducting current can be selected from relatively low-melting-point metal materials such as copper, and certain cooling measures will be taken to ensure that the electrodes will not overheat, so that there will be a large temperature gradient between the hot heating element and the cold electrode.

[0004] In the design of the resistive high-temperature heating device, the influence of the displacement generated by the thermal expansion of the heating element on the electrode structure must be considered, and currently there are three schemes for reference.

[0005] The first scheme is that if the positive and negative electrodes are fixed, the connection between the electrodes and the heating element usually adopts a wedge-shaped, tapered, grooved or gap structure to adapt to the thermal expansion and contraction of the heating element and ensure the close contact between the electrodes and the heating element, but after repeated temperature rise and fall, the related structural parts may be deformed or worn, the conductive contact area is unstable, and the reliability is not high.

[0006] The second scheme is that if one end of the electrode is fixed and the other end of the electrode is designed as a movable electrode, the pressure of the spring on the electrode can maintain the close contact between the electrode and the heating element when the heating element expands and contracts, but the movable electrode containing the water-cooled copper electrode, flexible copper bar or copper wire for transmitting current is usually very heavy, and the electrode movement guide mechanism is required to be high, and the stability is not high, in addition, if the movable electrode is packaged into a vacuum system, the structure will be very complicated, resulting in a large and heavy whole system.

[0007] The third scheme is that if one end electrode is fixed, the other end electrode is designed as a fixed part and a sliding electrode, the fixed part of the electrode can adopt a metal material with good conductivity such as copper, and the sliding electrode can adopt a material with high temperature resistance and self-lubrication such as graphite. Compared with the second scheme, the movable electrode part has small weight, good motion stability, is easy to be packaged into a vacuum system, and has simple and reliable structure. The difficulty of the scheme lies in the structure design of the sliding electrode, and the problem of the sliding electrode being stuck under high temperature needs to be solved. If the sliding electrode is directly cooled to ensure that it does not produce excessive thermal expansion, the internal temperature field of the heating element will be inevitably affected; if a heat insulation coating or a heat insulation part is added between the sliding electrode and the heating element, the conduction between the two will be inevitably affected, and unnecessary contact resistance and load resistance are introduced. SUMMARY

[0008] The main purpose of the present application is to provide a sliding electrode applied to a resistance high-temperature heating device, which avoids the contradiction that the electrode ring and the fixed electrode need to be in close contact and leave space for thermal expansion in the radial direction, avoids the sliding electrode being stuck under high temperature, by ensuring the axial conduction between the electrode ring and the fixed electrode and the electrode ring fixing part. The present application can be applied to various types of resistance high-temperature heating devices, and improves the reliability of the resistance high-temperature heating device.

[0009] The purpose of the present application is realized by the following technical scheme:

[0010] The present application discloses a sliding electrode applied to a resistance high-temperature heating device, which comprises a fixed electrode, an electrode ring, an electrode ring fixing part, and a sliding part. The fixed electrode is fixedly connected with other current-conducting coolers. The electrode ring and the sliding part are in close contact and can freely slide. The electrode ring is a circular ring body with a single-sided axial slit to adapt to the radial thermal expansion of the sliding part, and is installed in the fixed electrode groove with a radial expansion space. The electrode ring fixing part is used to limit the position of the electrode ring in the fixed electrode, the radial minimum gap between the fixed electrode and the electrode ring is smaller than the radial minimum gap between the fixed electrode, the electrode ring fixing part and the sliding part, the sliding part is supported on the electrode ring and does not directly contact the fixed electrode and the electrode ring fixing part.

[0011] The elastic element acts on the sliding part through the insulating part when the electric heating is conducted, so that the electric heating element is in electric contact with the sliding part when the electric heating element axially expands and shrinks, the electric heating element conducts heat to the sliding part, the sliding part is heated and expands radially, and the heat expansion direction of the sliding part is deviated from the current direction.

[0012] The sliding part, the electric heating element and the insulating part can be in a rod shape or have a central hole, so that the heated part is convenient for radiation temperature measurement and gas passing, and the sliding electrode can be vacuumized or filled with required gas according to requirements.

[0013] Preferably, the sliding electrode is made of a material with high temperature resistance, self-lubrication and good electric conductivity, the fixed electrode and the water-cooled copper electrode are connected together in a threaded or flange form, and the electrode ring fixing part and the fixed electrode are connected together in a threaded or flange form.

[0014] Beneficial effects:

[0015] 1. The sliding electrode applied to the electric resistance high-temperature heating device is disclosed, the fixed electrode is fixedly connected with other current-conducting cool conductors, the electrode ring and the sliding part are in close contact and can freely slide, the electrode ring is a circular ring body and has a single-side axial cut, can adapt to the radial heat expansion of the sliding part, the electrode ring is installed in the fixed electrode groove with a radial expansion space, the electrode ring fixing part is used for limiting the position of the electrode ring in the fixed electrode, the sliding part is supported on the electrode ring and does not directly contact the fixed electrode and the electrode ring fixing part. When the electric heating is conducted, the elastic element acts on the sliding part through the insulating part, so that the electric heating element is in electric contact with the sliding part when the electric heating element axially expands and shrinks, the electric heating element conducts heat to the sliding part, the sliding part is heated and expands radially, the heat expansion direction of the sliding part is deviated from the current direction. The electrode ring is in the heat expansion direction, and the electrode ring is heated and expanded, so that the fixed electrode, the electrode ring fixing part and the electrode ring are in better contact.

[0016] 2. This invention discloses a sliding electrode for use in a resistance-type high-temperature heating device. A fixed electrode is fixedly connected to other cooled conductors that conduct current. The minimum radial gap between the fixed electrode and the electrode ring is smaller than the minimum radial gap between the electrode ring fixing member and the sliding member. The current conduction direction is as follows: the sliding electrode ensures axial conductivity between the electrode ring and the fixed electrode, as well as the electrode ring fixing member, and conducts current to the sliding member. That is, the current enters the electrode ring axially from the fixed electrode and the electrode ring fixing member, and enters the sliding member radially from the electrode ring.

[0017] 3. The sliding electrode disclosed in this invention, applied to a resistance-type high-temperature heating device, achieves the beneficial effects 1 and 2 by offsetting the thermal expansion direction and current flow direction of the sliding element. This balances the contradiction between the radial contact required for tight electrical conductivity and the need to allow space for thermal expansion between the electrode ring and the fixed electrode, preventing the sliding electrode from jamming under high-temperature conditions. This invention can be applied to various types of resistance-type high-temperature heating devices, improving their reliability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a sliding electrode structure applied to a resistance-type high-temperature heating device according to the present invention.

[0019] In the figure: 1—fixed electrode, 2—electrode ring, 3—electrode ring fixing component, 4—sliding component, 5—heating element, 6—insulating component, 7—elastic element. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown in this embodiment, a sliding electrode for a resistance-type high-temperature heating device includes a fixed electrode 1, an electrode ring 2, an electrode ring fixing member 3, and a sliding member 4. The sliding electrode can be made of high-temperature resistant, self-lubricating, and highly conductive materials such as graphite. The fixed electrode 1 is fixedly connected to other current-conducting, cooled conductors. For example, the fixed electrode 1 can be connected to a water-cooled copper electrode by threads or flanges. The electrode ring 2 and the sliding member 4 are in close contact and can slide freely. The electrode ring 2 is a circular ring with a single-sided axial slit to accommodate the radial thermal expansion of the sliding member 4. The electrode ring 2 is installed in a groove in the fixed electrode 1 that provides radial expansion space. The electrode ring fixing member 3 is used to restrict the position of the electrode ring 2 in the fixed electrode 1. For example, the electrode ring fixing member 3 can be connected to the fixed electrode 1 by threads or flanges. The minimum radial gap between the fixed electrode 1 and the electrode ring 2 is smaller than the minimum radial gap between the fixed electrode 1 and the electrode ring fixing member 3 and the sliding member 4. The sliding member 4 is supported on the electrode ring 2 and does not directly contact the fixed electrode 1 or the electrode ring fixing member 3.

[0022] The elastic element 7 acts on the sliding element 4 through the insulating element 6 when the heating is powered, ensuring the electrically conductive contact of the heating element 5 with the sliding element 4 when the heating element 5 axially expands and contracts due to the heat, and the heating element 5 conducts heat to the sliding element 4, causing the sliding element 4 to heat up and expand radially. The sliding electrode ensures the axial electrically conductive contact between the electrode ring 2 and the fixed electrode 1 and the electrode ring fixing element 3, and the radial electrically conductive contact between the electrode ring 2 and the fixed electrode 1 is tight and leaves space for thermal expansion, solving the problem of the sliding electrode being stuck under high temperature conditions.

[0023] The sliding electrode, the sliding element 4, the heating element 5, and the insulating element 6 can be rod-shaped or have a central hole, which is convenient for radiation temperature measurement of the heated element and for passing gas, and the system can be vacuumized or filled with special gas as needed.

[0024] The above specific description further details the purpose, technical solution, and beneficial effects of the application. It should be understood that the above description is only a specific embodiment of the application and is not intended to limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. A sliding electrode used in a resistance-type high-temperature heating device, characterized in that: The device includes a fixed electrode (1), an electrode ring (2), an electrode ring fixing member (3), and a sliding member (4). The fixed electrode (1) is fixedly connected to other current-conducting, cooled conductors. The electrode ring (2) and the sliding member (4) are in close contact and can slide freely. The electrode ring (2) is a circular ring with a single-sided axial slit to accommodate the radial thermal expansion of the sliding member (4). The electrode ring (2) is installed in the groove of the fixed electrode (1) with a radial expansion space. The electrode ring fixing member (3) is used to limit the position of the electrode ring (2) in the fixed electrode (1). The minimum radial gap between the fixed electrode (1) and the electrode ring (2) is smaller than the minimum radial gap between the electrode ring fixing member (3) and the sliding member (4). The sliding member (4) is supported on the electrode ring (2) and does not directly contact the fixed electrode (1) or the electrode ring fixing member (3).

2. The sliding electrode for use in a resistance-type high-temperature heating device as described in claim 1, characterized in that: When heated by electricity, the elastic element (7) acts on the sliding element (4) through the insulating element (6) to ensure that the heating element (5) has conductive contact with the sliding element (4) when it expands and contracts axially. The heating element (5) will conduct heat to the sliding element (4), causing the sliding element (4) to heat up and generate radial thermal expansion. The thermal expansion direction of the sliding element (4) is offset from the current direction. The sliding electrode ensures axial conductivity between the electrode ring (2) and the fixed electrode (1) and the electrode ring fixing element (3). The electrode ring (2) conforms to thermal expansion, and the electrode ring (2) itself expands due to heat, which makes the contact between the fixed electrode (1), the electrode ring fixing element (3) and the electrode ring (2) better. This balances the contradiction between the electrode ring (2) and the fixed electrode (1) in radial conductivity and the need to leave space for thermal expansion, thus avoiding the sliding electrode from getting stuck under high temperature conditions.

3. A sliding electrode for use in a resistance-type high-temperature heating device as described in claim 1 or 2, characterized in that: The sliding element (4), heating element (5), and insulating element (6) are rod-shaped or have a central opening, which facilitates radiation temperature measurement of the heated element and allows gas to pass through. The sliding electrode can be evacuated or filled with the required gas as needed.

4. A sliding electrode for use in a resistance-type high-temperature heating device as described in claim 1 or 2, characterized in that: The sliding electrode is made of a material that is resistant to high temperature, self-lubricating, and has good electrical conductivity; the fixed electrode (1) and the water-cooled copper electrode are connected together by threads or flanges; the electrode ring fixing part (3) is connected to the fixed electrode (1) by threads or flanges.

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