A new type of low-voltage switchgear with built-in cooling system

Abstract

The present invention relates to a novel low-voltage switch electrical appliance with a built-in cooling system, comprising a low-voltage switch electrical appliance body, a busbar is arranged on the low-voltage switch electrical appliance body, a current transformer is installed on the busbar, a power module and a fan are installed on the low-voltage switch electrical appliance body, the current transformer is connected to the power module, the power module is connected to the fan, a heat dissipation channel and a wind circulation channel are also provided on the shell of the low-voltage switch electrical appliance body, the heat dissipation channel is arranged inside the low-voltage switch electrical appliance body, and the heat dissipation channel runs through the low-voltage switch electrical appliance body, one end of the heat dissipation channel matches the position of the fan, the wind circulation channel is arranged on the shell of the low-voltage switch electrical appliance, and a cooling air duct is formed between the heat dissipation channel and the wind circulation channel.

Description

Technical Field

[0001] The invention relates to a low-voltage switch electrical appliance, in particular to a novel low-voltage switch electrical appliance with a self-cooling system. Background Art

[0002] With the emergence of modern engineering facilities and equipment, the electricity consumption of various industries has increased rapidly, especially with the emergence of numerous high-rise buildings and large-scale workshops, the demand for low-voltage distribution boxes (cabinets) is very huge. Some low-voltage switchgear in low-voltage distribution boxes (cabinets) will continue to heat up under normal working conditions, especially when it comes to temperature rise tests of complete sets of equipment, the temperature rise of the switch terminals often exceeds the standard setting value. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a new type of low-voltage switch electrical appliance with a built-in cooling system.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A novel low-voltage switch electrical appliance with a built-in cooling system comprises a low-voltage switch electrical appliance body, a busbar is arranged on the low-voltage switch electrical appliance body, a current transformer is installed on the busbar, a power module and a fan are installed on the low-voltage switch electrical appliance body, the current transformer is connected to the power module, and the power module is connected to the fan, a heat dissipation channel and a wind circulation channel are also provided on the shell of the low-voltage switch electrical appliance body, the heat dissipation channel is arranged inside the low-voltage switch electrical appliance body, and the heat dissipation channel runs through the low-voltage switch electrical appliance body, one end of the heat dissipation channel matches the position of the fan, and the wind circulation channel is arranged on the shell of the low-voltage switch electrical appliance, and a cooling air duct is formed between the heat dissipation channel and the wind circulation channel.

[0006] Furthermore, the power module includes a rectifier bridge B1 and a trigger U3, the input end 1 and the input end 3 of the rectifier bridge B1 are connected to the current transformer, the output end 2 and the output end 4 of the rectifier bridge B1 are respectively connected to the pin 5 and the pin 3 of the trigger U3, and the pin 5 of the trigger U3 is respectively connected to the positive and negative poles of the fan.

[0007] Furthermore, a single-chip microcomputer U1 is connected in parallel between the rectifier bridge B1 and the trigger U3, and pin 4 of the U1 single-chip microcomputer is connected to pin 4 of the trigger U3. A voltage regulator U2 is also connected between the single-chip microcomputer U1 and the trigger U3, and pin 1 of the voltage regulator U2 is connected to pin 1 of the trigger U3. Pin 3 and pin 2 of the trigger U3 are respectively connected to pin 3 of the voltage regulator U2, and pin 2 of the voltage regulator U2 is connected to pin 2 and pin 4 of the rectifier bridge B1.

[0008] Furthermore, a resistor R1 and a capacitor C1 are connected in series between pin 2 of the voltage regulator U2 and pin 4 of the rectifier bridge B1, a rectifier diode M7 and a capacitor C2 are connected in series between pin 2 of the voltage regulator U2 and pin 2 of the rectifier bridge B1, the positive electrode of the rectifier diode M7 is connected to pin 2 of the rectifier bridge B1, the negative electrode of the rectifier diode M7 is connected to the capacitor C2, a resistor R2 is connected in series between the rectifier diode M7 and the capacitor C2, an electrolytic capacitor CE1 is connected in parallel between pin 2 and pin 4 of the rectifier bridge B1, and the positive electrode of the electrolytic capacitor CE1 is connected to pin 2 of the rectifier bridge B1.

[0009] Furthermore, the pin 5 of the trigger U3 is respectively connected to the positive electrode of the fan and a resistor R6 and a diode D1 are connected in series therebetween. The positive electrode of the diode D1 is connected to the resistor R6, and the negative electrode of the diode D1 is connected to the pin 5 of the trigger U3.

[0010] Furthermore, pin 4 of the microcontroller U1 is connected to pin 4 of the trigger U3, a resistor R4 is connected in series between pin 4 of the microcontroller U1 and pin 4 of the trigger U3, and a resistor R5 is connected in series between pin 2 of the trigger U3 and pin 3 of the regulator.

[0011] Furthermore, the fan is a turbocharged fan.

[0012] Furthermore, the wind circulation channel surrounds the fan.

[0013] Furthermore, the heat dissipation channel runs through the low-voltage switch electrical appliance body, and the part of the low-voltage switch electrical appliance body that needs to be cooled is located at a position where the air duct flows.

[0014] Furthermore, the number of the fans is greater than or equal to one.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In the present invention, under the condition that the normal parameters and performance of the switch electrical appliance remain unchanged, a fan and an air duct are installed on the electrical appliance body, and a current transformer is used to provide electric energy for the fan, so that the fan operates, and air forms an airflow in the air duct to take away the heat in the electrical appliance, thereby realizing rapid cooling of the electrical appliance terminal;

[0017] 2. The fan is operated by the sampling voltage of the current transformer. The magnetic resistance of the core induced magnetic field of the current transformer and the proportion of the secondary current loss energy are small and can be ignored, thus avoiding secondary heating.

[0018] 3. The current is sampled through the current transformer, which has no connection with the main circuit of the switch and will not affect the normal operation of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the main circuit diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the assembly of the present invention;

[0021] Figure 3 It is the circuit diagram of the power module of the present invention;

[0022] Figure 4 It is a schematic diagram of the installation position of the mutual inductor in the low-voltage circuit breaker of the present invention;

[0023] Figure 5 It is a schematic diagram of the fan structure in the low voltage circuit breaker of the present invention;

[0024] Figure 6 It is a fan assembly diagram of a low voltage circuit breaker of the present invention;

[0025] Figure 7 Experimental data table of the present invention.

[0026] In the figure: 1. power module, 2. low voltage switch electrical appliance body, 21. heat dissipation channel, 22. wind circulation channel, 3. fan, 4. current transformer. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] like Figure 1-Figure 3 shown.

[0030] A novel low-voltage switch electrical appliance with a built-in cooling system comprises a low-voltage switch electrical appliance body 2, a bus bar is arranged on the low-voltage switch electrical appliance body 2, a current transformer 4 is installed on the bus bar, a power module 1 and a fan 3 are installed on the low-voltage switch electrical appliance body 2, the current transformer 4 is connected to the power module 1, and the power module 1 is connected to the fan 3. A heat dissipation channel 21 and a wind circulation channel 22 are also provided on the shell of the low-voltage switch electrical appliance body 2, the heat dissipation channel 21 is arranged inside the low-voltage switch electrical appliance body 2, and the heat dissipation channel 21 runs through the low-voltage switch electrical appliance body 2, one end of the heat dissipation channel 21 matches the position of the fan 3, the wind circulation channel 22 is arranged on the shell of the low-voltage switch electrical appliance, and a cooling air duct is formed between the heat dissipation channel 21 and the wind circulation channel 22.

[0031] Furthermore, the power module 1 includes a rectifier bridge B1 and a trigger U3. The input terminal 1 and the input terminal 3 of the rectifier bridge B1 are connected to the current transformer 4. The output terminal 2 and the output terminal 4 of the rectifier bridge B1 are respectively connected to the pin 5 and the pin 3 of the trigger U3. The pin 5 of the trigger U3 is respectively connected to the positive and negative poles of the fan 3.

[0032] Furthermore, a single-chip microcomputer U1 is connected in parallel between the rectifier bridge B1 and the trigger U3, and pin 4 of the U1 single-chip microcomputer is connected to pin 4 of the trigger U3. A voltage regulator U2 is also connected between the single-chip microcomputer U1 and the trigger U3, and pin 1 of the voltage regulator U2 is connected to pin 1 of the trigger U3. Pin 3 and pin 2 of the trigger U3 are respectively connected to pin 3 of the voltage regulator U2, and pin 2 of the voltage regulator U2 is connected to pin 2 and pin 4 of the rectifier bridge B1.

[0033] Furthermore, a resistor R1 and a capacitor C1 are connected in series between pin 2 of the voltage regulator U2 and pin 4 of the rectifier bridge B1, a rectifier diode M7 and a capacitor C2 are connected in series between pin 2 of the voltage regulator U2 and pin 2 of the rectifier bridge B1, the positive electrode of the rectifier diode M7 is connected to pin 2 of the rectifier bridge B1, the negative electrode of the rectifier diode M7 is connected to capacitor C2, a resistor R2 is connected in series between the rectifier diode M7 and the capacitor C2, an electrolytic capacitor CE1 is connected in parallel between pin 2 and pin 4 of the rectifier bridge B1, and the positive electrode of the electrolytic capacitor CE1 is connected to pin 2 of the rectifier bridge B1.

[0034] Furthermore, the pin 5 of the trigger U3 is respectively connected to the positive electrode of the fan 3 and a resistor R6 and a diode D1 are connected in series therebetween. The positive electrode of the diode D1 is connected to the resistor R6 , and the negative electrode of the diode D1 is connected to the pin 5 of the trigger U3 .

[0035] Furthermore, pin 4 of the microcontroller U1 is connected to pin 4 of the trigger U3, a resistor R4 is connected in series between pin 4 of the microcontroller U1 and pin 4 of the trigger U3, and a resistor R5 is connected in series between pin 2 of the trigger U3 and pin 3 of the regulator.

[0036] Furthermore, the fan 3 is a turbocharged fan 3, the wind circulation channel surrounds the fan 3, the heat dissipation channel 21 runs through the low-voltage switch electrical body 2, and the part of the low-voltage switch electrical body 2 that needs to be cooled is located at the position where the air duct flows, and the number of fans 3 is greater than or equal to 1.

[0037] Furthermore, in the present invention, when the normal parameters and performance of the switch electrical appliance remain unchanged, a fan 3 and an air duct are installed on the electrical appliance body, and the current transformer 4 is used to provide electric energy to the fan 3, so that the fan 3 operates, and the air forms an airflow in the air duct to take away the heat in the electrical appliance, thereby realizing rapid cooling of the electrical appliance terminal;

[0038] Furthermore, the fan 3 is operated by the sampled voltage of the current transformer 4, and the magnetic resistance of the core induced magnetic field of the current transformer 4 and the proportion of the secondary current loss electric energy generated are small and can be ignored, thus avoiding secondary heating;

[0039] Furthermore, the current is sampled through the current transformer 4, which has no connection with the main circuit of the switch and will not affect the normal operation of the switch electrical appliance.

[0040] Furthermore, the operating voltage of the turbocharged fan 3 adopted in the present invention is 12V. Only when the sampling voltage of the current transformer 4 reaches the operating voltage of the turbocharged fan 3, the fan 3 will start, that is, when the switching device reaches a predetermined voltage, the fan 3 will start and begin to cool down, so that the operating condition of the fan 3 changes with the change of the voltage in the switching device, thereby improving the utilization rate of energy and making the operation of the fan 3 more intelligent.

[0041] Furthermore, the low-voltage switchgear includes molded case circuit breakers, disconnectors, fuse disconnectors, etc.

[0042] Further, taking the molded case circuit breaker as an example, Figure 4-Figure 6 As shown, the current transformer 4 is installed below the bus bar of the molded case circuit breaker, and then the back plate of the molded case circuit breaker is connected, the power module 1 is fixedly set on the back plate, the power module 1 and the current transformer 4 are connected through the back plate, a heat dissipation channel 21 is passed through the back plate, and a circle of wind circulation channel 22 is arranged on the side of the back plate. The air duct in the heat dissipation channel 21 passes through the interior of the molded case circuit breaker and communicates with the external air. A turbocharger fan 3 is installed at the position of the heat dissipation channel 21. The turbocharger fan 3 draws air from the heat dissipation channel 21 and discharges it from the wind circulation channel 22 on the side, so that air convection is formed inside and outside the molded case circuit breaker to take away the heat from the terminal of the molded case circuit breaker.

[0043] Further, such as Figure 7 As shown, it is the temperature change of the molded case circuit breaker before and after the application of the present invention. It can be clearly seen that after using the cooling system of the present invention, the temperature rise of the incoming and outgoing ends of the switch is reduced by 15k on average.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0045] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A novel low-voltage switchgear with a built-in cooling system, comprising a low-voltage switchgear body, on which a busbar is arranged, characterized in that: A current transformer is installed on the busbar, and a power module and a fan are installed on the low-voltage switch electrical appliance body. The power module is connected to the fan, and the power module is fixedly arranged on the back panel of the low-voltage switch electrical appliance. The power module and the current transformer are connected through the back panel. A heat dissipation channel runs through the back panel, and a circle of wind circulation channels is arranged on the side of the back panel. The air duct in the heat dissipation channel passes through the interior of the low-voltage switch electrical appliance and communicates with the external air. One end of the heat dissipation channel matches the position of the fan, and a cooling air duct is formed between the heat dissipation channel and the wind circulation channel.

2. The novel low-voltage switchgear with built-in cooling system according to claim 1 is characterized in that: The power module includes a rectifier bridge B1 and a trigger U3. The input end 1 and the input end 3 of the rectifier bridge B1 are connected to the current transformer. The output end 2 and the output end 4 of the rectifier bridge B1 are respectively connected to the pin 5 and the pin 3 of the trigger U3. The pin 5 of the trigger U3 is respectively connected to the positive and negative poles of the fan.

3. The novel low-voltage switchgear with built-in cooling system according to claim 2 is characterized in that: A single-chip microcomputer U1 is also connected in parallel between the rectifier bridge B1 and the trigger U3, and pin 4 of the U1 single-chip microcomputer is connected to pin 4 of the trigger U3. A voltage regulator U2 is also connected between the single-chip microcomputer U1 and the trigger U3, and pin 1 of the voltage regulator U2 is connected to pin 1 of the trigger U3. Pin 3 and pin 2 of the trigger U3 are respectively connected to pin 3 of the voltage regulator U2, and pin 2 of the voltage regulator U2 is connected to pin 2 and pin 4 of the rectifier bridge B1.

4. The novel low-voltage switchgear with a self-cooling system according to claim 3 is characterized in that: A resistor R1 and a capacitor C1 are also connected in series between pin 2 of the voltage regulator U2 and pin 4 of the rectifier bridge B1. A rectifier diode M7 and a capacitor C2 are also connected in series between pin 2 of the voltage regulator U2 and pin 2 of the rectifier bridge B1. The positive electrode of the rectifier diode M7 is connected to pin 2 of the rectifier bridge B1, and the negative electrode of the rectifier diode M7 is connected to the capacitor C2. A resistor R2 is also connected in series between the rectifier diode M7 and the capacitor C2. An electrolytic capacitor CE1 is also connected in parallel between pin 2 and pin 4 of the rectifier bridge B1, and the positive electrode of the electrolytic capacitor CE1 is connected to pin 2 of the rectifier bridge B1.

5. The novel low-voltage switchgear with a self-cooling system according to claim 2 is characterized in that: A resistor R6 and a diode D1 are connected in series to the pin 5 of the trigger U3 , the anode of the diode D1 is connected to the resistor R6 , and the cathode of the diode D1 is connected to the pin 5 of the trigger U3 .

6. The novel low-voltage switchgear with a self-cooling system according to claim 3 is characterized in that: Pin 4 of the single-chip microcomputer U1 is connected to pin 4 of the trigger U3, a resistor R4 is connected in series between pin 4 of the single-chip microcomputer U1 and pin 4 of the trigger U3, and a resistor R5 is connected in series between pin 2 of the trigger U3 and pin 3 of the voltage regulator U2.

7. The novel low-voltage switchgear with a self-cooling system according to claim 1 is characterized in that: The fan is a turbocharged fan.

8. The novel low-voltage switchgear with a self-cooling system according to claim 1 is characterized in that: The wind circulation channel surrounds the fan.

9. The novel low-voltage switchgear with a self-cooling system according to claim 1 is characterized in that: The part of the low-voltage switch electrical appliance body that needs to be cooled is located at the position where the wind circulation channel flows.

10. The novel low-voltage switchgear with a self-cooling system according to claim 7 is characterized in that: The number of the fans is greater than or equal to 1.

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