A pneumatic adjustable resistance device

Abstract

The utility model relates to a pneumatic adjustable resistor device, comprising: a resistor device housing; an electrode terminal block installed in the resistor device housing; a supporting insulator installed at the bottom of the resistor device; a plurality of chip resistors, all connected to the electrode terminal block; the chip resistors have an input end and an output end, and the output ends of the plurality of chip resistors are connected in parallel; a pneumatic switch is hinged to the output end; the pneumatic switch is configured to open or close the input end. The utility model controls the closing of the resistor by using a cylinder, and can adjust the size of the resistor arbitrarily to obtain an ideal power factor.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a pneumatic adjustable resistance device. Background Art

[0002] According to the test requirements of GB / T 14048 "Low-voltage switchgear and control equipment", low-voltage switchgear and control equipment need to undergo the following tests: electrical life test, operating performance test, connection and disconnection test, short-circuit test, overload test, etc.

[0003] At present, the resistance devices required for these electrical tests in test stations, electrical research institutes, some large scientific research enterprises and universities generally use the series connection of resistors, and the gear switching of the resistors uses manual switching of knife switches. This series connection of manual knife switches is ideal for small currents and low power factor requirements, but it is difficult to meet the requirements for large currents and high power factors.

[0004] In addition, low-voltage switchgear is an important part of the new power system, which puts forward higher technical requirements for low-voltage switchgear. One of them is that the power factor of the test equipment must reach above 0.99. The power factor of the resistance device composed of series connection often fails to meet the requirements because the copper busbar accounts for too large a proportion of the loop. In many cases of large current and small resistance, the power factor is often below 0.8, which is far from the requirements. Utility Model Content

[0005] Aiming at the deficiencies of the prior art, the utility model discloses a pneumatic adjustable resistance device.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A pneumatic adjustable resistor device, comprising:

[0008] Resistor device housing;

[0009] An electrode terminal block is installed in the housing of the resistor device;

[0010] A support insulator is mounted on the bottom of the housing of the resistor device;

[0011] A plurality of chip resistors are connected to the electrode wiring row; the chip resistor has an input end and an output end, and the output ends of the plurality of chip resistors are connected in parallel;

[0012] A pneumatic switch is hinged to the output end; the pneumatic switch is configured to open or close the input end.

[0013] In one embodiment of the present invention, the resistance values ​​of the plurality of chip resistors are different.

[0014] In an embodiment of the present invention, the output ends of the plurality of chip resistors are rotatably connected to the rotating shaft.

[0015] In one embodiment of the utility model, the action end of the pneumatic switch is connected to one end of a connecting rod, and the other end of the connecting rod is connected to the output end.

[0016] In one embodiment of the present invention, the electrode terminal block is fixed in the housing of the resistor device by screws.

[0017] In one embodiment of the present invention, the support insulator is installed on the bottom of the resistor device housing by nut connection or crimping.

[0018] In one embodiment of the utility model, the chip resistor includes a substrate; a resistance film is formed on the surface of the substrate; the input end and the output end are respectively located at two ends of the substrate; the resistance film, the input end and the output end are covered with a protective layer.

[0019] The above technical solution of the utility model has the following advantages compared with the prior art:

[0020] The pneumatic adjustable resistor device of the utility model is connected in parallel by resistors, and can be infinitely expanded in theory to obtain the largest possible current.

[0021] The pneumatic adjustable resistor device of the utility model adopts pneumatic adjustment to control the opening or closing of the chip resistor.

[0022] The pneumatic adjustable resistor device of the utility model is connected in parallel with the resistor to reduce the volume of the resistor and make the manufacturing easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0024] Figure 1 It is a front view of the pneumatic adjustable resistor device in the utility model.

[0025] Figure 2 It is a side view of the pneumatic adjustable resistor device in the utility model.

[0026] Figure 3 It is a schematic diagram of the pneumatic adjustable resistor device in the utility model.

[0027] Explanation of the reference numerals in the specification: 100, resistor device housing; 200, chip resistor; 201, input terminal; 202, output terminal; 300, rotating shaft; 400, pneumatic switch; 500, electrode terminal block; 600, supporting insulator. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0029] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only the directions of the reference drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention. In addition, in all embodiments, the same reference numerals represent the same elements.

[0030] The applicant found that the existing series manual knife switch switching resistor method is ideal when the current is small and the power factor requirement is not high, but it is difficult to meet the requirements under high current and high power factor. In addition, the existing series resistor device often fails to meet the requirement of 0.99 or above due to the large proportion of copper busbars in the loop. In many cases of high current and low resistance, the power factor is often below 0.8, which is far from the requirement.

[0031] In order to solve the above problems, this embodiment provides a pneumatic adjustable resistor device.

[0032] Combination Figure 1 and Figure 2 A pneumatic adjustable resistor device includes a resistor device housing 100, a plurality of chip resistors 200, a pneumatic switch 400, an electrode terminal block 500 and a supporting insulator 600.

[0033] The electrode terminal block 500 is installed in the resistor housing 100. The support insulator 600 is installed at the bottom of the resistor housing 100.

[0034] The plurality of chip resistors 200 are all connected to the electrode wiring array 500. The chip resistor 200 has an input terminal 201 and an output terminal 202, and the output terminals of the plurality of chip resistors 200 are connected in parallel.

[0035] The pneumatic switch 400 is hinged to the output terminal 202. The pneumatic switch 400 is configured to open or close the input terminal 201.

[0036] In this embodiment, the resistance values ​​of the plurality of chip resistors 200 are different. For example, there are seven chip resistors 200, and the resistance values ​​of the seven chip resistors 200 are 1 kΩ, 2 kΩ, 3 kΩ, 4 kΩ, 5 kΩ, 6 kΩ, and 7 kΩ, respectively. It should be noted that the number and resistance value of the chip resistors 200 can be adjusted by a person skilled in the art according to requirements.

[0037] Specifically, the chip resistor 200 includes a substrate; a resistor film is formed on the surface of the substrate; an input terminal 201 and an output terminal 202 are respectively located at two ends of the substrate; and the resistor film, the input terminal 201 and the output terminal 202 are covered with a protective layer. Among them, the substrate is made of ceramic and serves as a support for the chip resistor 200. The resistor film is a key part that determines the resistance value and is usually made of materials such as metal oxides. The input terminal 201 and the output terminal 202 are used to connect to the circuit, and the protective layer is generally made of metal materials such as silver, copper, etc. It plays a protective role to prevent the external environment from affecting the resistance performance, such as preventing oxidation and corrosion.

[0038] Furthermore, the resistance wire of the chip resistor 200 is wound in a forward and reverse manner so that the generated inductance components cancel each other out, thereby improving the power factor of the resistor. The power factor of the resistor can reach above 0.99.

[0039] In this embodiment, the output ends 202 of the plurality of chip resistors 200 are rotatably connected to the rotating shaft 300 , wherein both ends of the rotating shaft 300 are respectively mounted on the electrode wiring array 500 .

[0040] In this embodiment, the action end of the pneumatic switch 400 is connected to one end of the connecting rod, and the other end of the connecting rod is connected to the output end 202. The mounting portion of the pneumatic switch 400 is fixed to the inner bottom wall of the resistor device housing 100, and the pneumatic switch 400 is arranged between the input end 201 and the output end 202 of the chip resistor 200. The pneumatic switch 400 can be a cylinder.

[0041] In this embodiment, the electrode wiring array 500 is fixed in the resistor device housing 100 by screws, and the plurality of chip resistors 200 are connected to the main circuit.

[0042] In this embodiment, the support insulator 600 is installed at the bottom of the resistor device housing 100 by nut connection or crimping. If the nut connection is used, first insert the support insulator 600 into the corresponding hole of the resistor device housing 100, and gently rotate it to make the support insulator 600 fit the hole wall, then put the nuts one by one, and insert the washers. Use a suitable wrench to tighten the nuts in a clockwise direction and keep them horizontal. If the crimping connection is used, insert the support insulator 600 into the corresponding hole of the resistor device housing 100, then place the high-voltage clamp between the insulator and the resistor device housing 100, keep the jaws vertical, and then press the pressure button, and the crimping accessories will press the connection port until it is finished.

[0043] like Figure 3 As shown, the working principle of the utility model is as follows:

[0044] The chip resistors 200 can be designed to have the same or different resistance values ​​according to test requirements. Each chip resistor 200 has an input terminal 201 and an output terminal 202 , and the output terminals of all chip resistors 200 are connected in parallel.

[0045] Pneumatic adjustment is adopted, that is, the input terminal 201 is opened or closed by moving the action end of the pneumatic switch 400, so as to obtain different parallel resistance values, thereby obtaining the current value required for the test. Obviously, as long as enough chip resistors 200 are incorporated, a sufficiently large current and a sufficiently small adjustment fineness can be obtained.

[0046] The pneumatic adjustable resistor device provided in this embodiment is universal, scalable, easy to manufacture, and applicable to a wide range of electrical equipment.

[0047] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0048] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A pneumatic adjustable resistor device, characterized in that: include: A resistor device housing (100); An electrode terminal block (500) is installed in the resistor device housing (100); A supporting insulator (600) mounted on the bottom of the resistor device housing (100); A plurality of chip resistors (200) are all connected to the electrode wiring array (500); the chip resistor (200) has an input end (201) and an output end (202), and the output ends of the plurality of chip resistors (200) are connected in parallel; The pneumatic switch (400) is hinged to the output end (202); the pneumatic switch (400) is configured to open or close the input end (201).

2. The pneumatic adjustable resistor device according to claim 1, characterized in that: The resistance values ​​of the plurality of chip resistors (200) are different.

3. The pneumatic adjustable resistor device according to claim 1, characterized in that: The output ends (202) of the plurality of chip resistors (200) are rotatably connected to the rotating shaft (300).

4. The pneumatic adjustable resistor device according to claim 1, characterized in that: The action end of the pneumatic switch (400) is connected to one end of a connecting rod, and the other end of the connecting rod is connected to the output end (202).

5. The pneumatic adjustable resistor device according to claim 1, characterized in that: The electrode wiring row (500) is fixed in the resistor device housing (100) by means of screws.

6. The pneumatic adjustable resistor device according to claim 1, characterized in that: The support insulator (600) is installed on the bottom of the resistor device housing (100) by nut connection or crimping.

7. The pneumatic adjustable resistor device according to claim 1, characterized in that: The chip resistor (200) comprises a substrate; a resistance film is formed on the surface of the substrate; the input end (201) and the output end (202) are respectively located at two ends of the substrate; and the resistance film, the input end (201) and the output end (202) are covered with a protective layer.

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