Three-phase four-wire alternating current load box

Abstract

The utility model provides a three-phase four-wire alternating current load box, which comprises a load box main body, the top and the bottom of the load box main body are fixedly connected with filter screen plates, the load box main body is also internally provided with a heat dissipation fan, and the heat dissipation fan is used for realizing heat exchange between the interior of the load box main body and the external environment. And the filter screen plate is used for preventing external dust from entering. According to the load box, the heat dissipation fan is arranged and used for achieving heat exchange between the interior of the load box body and the external environment, so that heat in the load box body can be dissipated in time, the situation that aging of all parts is accelerated due to heat accumulation is reduced, the filter screen plate is used for preventing external dust from entering the load box body, and the service life of the load box body is prolonged. The influence of dust on heat dissipation of the load box main body is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of load boxes, in particular to a three-phase four-wire AC load box. Background Art

[0002] The three-phase four-wire AC load box is a common electrical testing instrument, mainly used to test the performance of electronic products and circuit fault detection. It simulates the operating state of the circuit under different conditions by adjusting the current and voltage, so as to detect the reliability and stability of the circuit. The three-phase four-wire AC load box is widely used in power systems, new energy fields, scientific research and experiments, etc. It can simulate the power factor, voltage, current and other parameters of various electrical equipment, monitor and analyze the power system in real time, so as to find potential problems and provide a basis for the optimization and improvement of the power system.

[0003] The load box will generate heat inside during operation, and the heat inside the load box cannot be dissipated in time. In the long run, it will accelerate the aging of various components, increase the maintenance frequency and maintenance cost. Therefore, we make improvements to this and propose a three-phase four-wire AC load box. Summary of the invention

[0004] The utility model aims to solve the problem that the heat in the existing load box cannot be dissipated in time, which will lead to the accelerated aging of various components and increase the maintenance frequency and maintenance cost in the long run.

[0005] In order to achieve the above-mentioned purpose of the invention, the utility model provides a three-phase four-wire AC load box to improve the above-mentioned problem.

[0006] The specific application is as follows:

[0007] A three-phase four-wire AC load box comprises a load box body, the top and bottom of the load box body are fixedly connected with filter plates, and a heat dissipation fan is also arranged in the load box body, the heat dissipation fan is used to realize heat exchange between the load box body and the external environment, and the filter plate is used to prevent the entry of external dust.

[0008] As a preferred technical solution of the present application, a control panel is provided on one side of the load box body, and a three-phase multifunctional meter, a buzzer, several circuit breakers, several wiring posts and a power interface are provided on the control panel.

[0009] As a preferred technical solution of the present application, the number of the binding posts is four, of which three are the U end, the V end, the W end and the N end.

[0010] As a preferred technical solution of the present application, the plurality of circuit breakers are equally divided into three groups, the plurality of circuit breakers in each group are connected in parallel and are connected with current transformers, and the three current transformers are respectively connected to the U terminal, the V terminal and the W terminal;

[0011] Each of the circuit breakers is connected in series with a resistor, and a plurality of resistors are connected to the N terminal.

[0012] As a preferred technical solution of the present application, a fan power switch is arranged between the power interface and the cooling fan, which is used to realize the connection between the cooling fan and the power supply. A thermostat is also arranged in the load box body. One end of the fan power switch is connected to the L line of the power supply, and the other end of the fan power switch is connected to the cooling fan, the three-phase multi-function instrument and the thermostat. The N line of the power supply is connected to the cooling fan, the buzzer and the three-phase multi-function instrument, and the thermostat is connected in series with the buzzer.

[0013] As a preferred technical solution of the present application, the outer surface of the control panel is slidably connected to the load box body, a guide rail is fixedly installed inside the load box body, a sliding seat is slidably connected to the outer surface of the guide rail, a connecting frame is fixedly installed on the top of the sliding seat, and the connecting frame is fixedly connected to the back of the control panel.

[0014] As a preferred technical solution of the present application, an electric push rod is also fixedly installed in the load box body, and one end of the electric push rod is fixedly connected to the connecting frame.

[0015] As a preferred technical solution of the present application, a protection mechanism is provided on one side of the load box body close to the control panel, and the protection mechanism includes two protection members provided on the load box body.

[0016] As a preferred technical solution of the present application, the protective member includes a support seat fixedly installed on the front side of the load box body, a protective plate is placed between the top of the support seat and the load box body, a side groove is opened on the side of the protective plate, a connecting shaft is fixedly installed in the side groove, a connecting seat is sleeved on the outer surface of the connecting shaft, and one side of the connecting seat is fixedly connected to the load box body.

[0017] As a preferred technical solution of the present application, a spring is sleeved on the outer surface of the connecting shaft, and two ends of the spring are respectively in contact with the side groove and the connecting seat.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] In the scheme of this application:

[0020] In order to solve the problem in the prior art that the heat in the load box cannot be dissipated in time, which will lead to accelerated aging of various components in the long run, and increase the maintenance frequency and maintenance cost, the present application sets up a heat dissipation fan, which is used to realize heat exchange between the load box body and the external environment, so that the heat in the load box body can be dissipated in time, thereby reducing the situation where heat accumulation causes accelerated aging of various components, and the filter plate is used to block the entry of external dust, so as to reduce the impact of dust on the heat dissipation of the load box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a three-phase four-wire AC load box provided for this application;

[0022] Figure 2 Provided for this application Figure 1 Schematic diagram of the structure viewed from above;

[0023] Figure 3 A schematic diagram of the structure of the heat dissipation fan provided in this application;

[0024] Figure 4 A schematic diagram of the structure of the protection mechanism provided for this application;

[0025] Figure 5 A schematic diagram of the structure when the protective plate provided in the present application is rotated to the side of the load box body;

[0026] Figure 6 A schematic diagram of the structure of the electric push rod provided for this application;

[0027] Figure 7 A schematic diagram of the structure of the connecting frame provided for this application;

[0028] Figure 8 Load circuit diagram of the three-phase four-wire AC load box provided for this application;

[0029] Fig. 9 Wiring diagram of the three-phase multi-function meter provided for this application;

[0030] Fig.10 This is a control circuit diagram of the heat dissipation fan provided in this application.

[0031] Indicated in the figure:

[0032] 1. Load box body; 2. Filter plate; 3. Control panel; 301. Three-phase multi-function instrument; 302. Buzzer; 303. Circuit breaker; 304. Terminal block; 305. Power interface; 4. Cooling fan; 5. Protection mechanism; 501. Support seat; 502. Connecting seat; 503. Protection plate; 504. Side groove; 505. Connecting shaft; 506. Spring; 6. Guide rail; 601. Sliding seat; 602. Electric push rod; 603. Connecting frame. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0034] As described in the background art, the load box generates heat inside during operation. The heat in the load box cannot be dissipated in time, which will lead to accelerated aging of various components over time, increasing maintenance frequency and maintenance costs.

[0035] In order to solve this technical problem, the utility model provides a three-phase four-wire AC load box.

[0036] Specifically, please refer to Figure 1-Figure 3 , the three-phase four-wire AC load box specifically includes:

[0037] The load box body 1 has a filter plate 2 fixedly connected to the top and bottom of the load box body 1, and a heat dissipation fan 4 is also arranged in the load box body 1, and the heat dissipation fan 4 is used to realize heat exchange between the load box body 1 and the external environment, and the filter plate 2 is used to prevent the entry of external dust.

[0038] The three-phase four-wire AC load box provided by the utility model is provided with a heat dissipation fan 4, which is used to realize heat exchange between the load box body 1 and the external environment, so that the heat in the load box body 1 can be dissipated in time to reduce the situation where heat accumulation leads to accelerated aging of various components, and the filter plate 2 is used to block the entry of external dust to reduce the influence of dust on the heat dissipation of the load box body 1.

[0039] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] Example 1, please refer to Figure 1-Figure 3 A three-phase four-wire AC load box includes a load box body 1, the top and bottom of the load box body 1 are fixedly connected with a filter plate 2, and a heat dissipation fan 4 is also arranged in the load box body 1, the heat dissipation fan 4 is used to realize heat exchange between the load box body 1 and the external environment, and the filter plate 2 is used to block the entry of external dust, so that the heat in the load box body 1 can be dissipated in time, so as to reduce the situation where the heat accumulation leads to accelerated aging of various components.

[0043] Further, such as Figure 1-Figure 3 As shown, a control panel 3 is provided on one side of the load box body 1, and a three-phase multifunctional meter 301, a buzzer 302, a plurality of circuit breakers 303, a plurality of terminal posts 304 and a power interface 305 are provided on the control panel 3. The buzzer 302 can sound an alarm when the temperature inside the load box body 1 is too high.

[0044] Furthermore, the number of the binding posts 304 is four, wherein three of the binding posts 304 are respectively a U terminal, a V terminal, a W terminal and an N terminal, and the N terminal is used as a ground terminal.

[0045] Further, such as Figure 8 As shown, several circuit breakers 303 are equally divided into three groups, and multiple circuit breakers 303 in each group are connected in parallel and connected to current transformers, and the three current transformers are respectively connected to the U terminal, the V terminal and the W terminal, and the current transformer is connected to the three-phase multifunctional instrument 301;

[0046] Each of the circuit breakers 303 is connected in series with a resistor, and a plurality of resistors are connected to the N terminal.

[0047] Further, such as Fig. 9 and Fig.10 As shown, a fan power switch is provided between the power interface 305 and the heat dissipation fan 4, which is used to connect the heat dissipation fan 4 with the power supply. A thermostat is also provided in the load box body 1. One end of the fan power switch is connected to the L line of the power supply, and the other end of the fan power switch is connected to the heat dissipation fan 4, the three-phase multifunctional instrument 301 and the thermostat. The N line of the power supply is connected to the heat dissipation fan 4, the buzzer 302 and the three-phase multifunctional instrument 301, and the thermostat is connected in series with the buzzer 302. The thermostat is used to monitor the temperature in the load box body 1. When the temperature in the load box body 1 reaches the set value of the thermostat, the circuit of the buzzer 302 is connected to emit a sound for alarm. Fig. 9 The upper left connection of the three-phase multi-function meter 301 is L and N, which are the L line and N line of the power supply.

[0048] Embodiment 2 further optimizes the three-phase four-wire AC load box provided in Embodiment 1. Specifically, Figure 6-Figure 7As shown, the outer surface of the control panel 3 is slidably connected to the load box body 1, and a guide rail 6 is fixedly installed inside the load box body 1. The outer surface of the guide rail 6 is slidably connected to a slide seat 601, and a connecting frame 603 is fixedly installed on the top of the slide seat 601. The connecting frame 603 is fixedly connected to the back of the control panel 3. The cooperation between the guide rail 6, the slide seat 601 and the connecting frame 603 can support the control panel 3 and enable the control panel 3 to move, so that the control panel 3 can be moved into the load box body 1 when not in use, so as to reduce the situation where the components on the control panel 3 are damaged by bumps during movement.

[0049] Further, such as Figure 6-Figure 7 As shown, an electric push rod 602 is fixedly installed in the load box body 1, and one end of the electric push rod 602 is fixedly connected to the connecting frame 603. The electric push rod 602 can drive the control panel 3 to move through the connecting frame 603.

[0050] Embodiment 3 further optimizes the three-phase four-wire AC load box provided in Embodiment 2. Specifically, Figure 4 As shown, a protective mechanism 5 is provided on one side of the load box body 1 close to the control panel 3. The protective mechanism 5 includes two protective members arranged on the load box body 1. The protective members can improve the protective effect of the control panel 3 after the control panel 3 is moved into the load box body 1. When the control panel 3 extends out of the load box body 1, the protective member can rotate to the side of the load box body 1 and contact with the supporting plane supporting the load box body 1, thereby reducing the movement of the load box body 1 and improving the stability of the load box body 1 when in use.

[0051] Further, such as Figure 4 As shown, the protective member includes a support seat 501 fixedly installed on the front side of the load box body 1, a protective plate 503 is placed between the top of the support seat 501 and the load box body 1, a side groove 504 is opened on the side of the protective plate 503, a connecting shaft 505 is fixedly installed in the side groove 504, and a connecting seat 502 is sleeved on the outer surface of the connecting shaft 505, one side of the connecting seat 502 is fixedly connected to the load box body 1, and the connecting seat 502 and the connecting shaft 505 cooperate with each other to connect the protective plate 503 to the load box body 1, and enable the protective plate 503 to rotate

[0052] Further, such as Figure 4 As shown, a spring 506 is sleeved on the outer surface of the connecting shaft 505, and the two ends of the spring 506 are respectively in contact with the side groove 504 and the connecting seat 502. The spring 506 can limit the protective plate 503 to improve the stability of the protective plate 503 when it contacts the support seat 501 or the supporting plane.

[0053] The operation of the protection mechanism 5 is as follows. When in use, the protection mechanism 5 is changed from Figure 4 Switch to Figure 5 , the protective plate 503 is rotated around the connecting shaft 505 so that the protective plate 503 is separated from the supporting seat 501, and the protective plate 503 is rotated to the side of the load box body 1. When the protective plate 503 is loosened, the force of the spring 506 can drive the protective plate 503 to drop so that the protective plate 503 contacts the supporting plane of the load box body 1, and then the electric push rod 602 pushes the control panel 3 out of the load box body 1 through the connecting frame 603. Figure 5 As shown, after use, the electric push rod 602 drives the control panel 3 to retract into the load box body 1 through the connecting frame 603, and then pushes the protective plate 503 upward and rotates the protective plate 503 toward the support seat 501 and contacts the support seat 501, that is, Figure 4 shown.

[0054] The use process of the three-phase four-wire AC load box provided by the utility model is as follows:

[0055] First, use the power cord to connect the power interface 305 to a stable power source; as needed, use the test line to connect the terminal 304 to the device or system to be tested for testing; during use, the thermostat can monitor the temperature inside the load box body 1. When the temperature inside the load box body 1 reaches the set value of the thermostat, the buzzer 302 circuit is connected to sound an alarm.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A three-phase four-wire AC load box, characterized in that: The invention comprises a load box body (1), the top and the bottom of the load box body (1) are fixedly connected to filter plates (2), and a heat dissipation fan (4) is also arranged in the load box body (1), the heat dissipation fan (4) is used to realize heat exchange between the load box body (1) and the external environment, and the filter plate (2) is used to prevent the entry of external dust.

2. A three-phase four-wire AC load box according to claim 1, characterized in that: A control panel (3) is provided on one side of the load box body (1); the control panel (3) is provided with a three-phase multifunctional meter (301), a buzzer (302), a plurality of circuit breakers (303), a plurality of wiring posts (304) and a power supply interface (305).

3. A three-phase four-wire AC load box according to claim 2, characterized in that: The number of the binding posts (304) is four, of which three binding posts (304) are respectively a U end, a V end, a W end and an N end.

4. A three-phase four-wire AC load box according to claim 3, characterized in that: A plurality of the circuit breakers (303) are equally divided into three groups, a plurality of the circuit breakers (303) in each group are connected in parallel and are connected to a current transformer, and the three current transformers are respectively connected to the U terminal, the V terminal and the W terminal; Each circuit breaker (303) is connected in series with a resistor, and a plurality of resistors are connected to the N terminal.

5. A three-phase four-wire AC load box according to claim 4, characterized in that: A fan power switch is provided between the power interface (305) and the heat dissipation fan (4) for achieving connection between the heat dissipation fan (4) and the power supply. A thermostat is also provided in the load box body (1). One end of the fan power switch is connected to the L line of the power supply. The other end of the fan power switch is connected to the heat dissipation fan (4), the three-phase multifunctional instrument (301) and the thermostat. The N line of the power supply is connected to the heat dissipation fan (4), the buzzer (302) and the three-phase multifunctional instrument (301). The thermostat is connected in series with the buzzer (302).

6. A three-phase four-wire AC load box according to claim 5, characterized in that: The outer surface of the control panel (3) is slidably connected to the load box body (1); a guide rail (6) is fixedly installed inside the load box body (1); a sliding seat (601) is slidably connected to the outer surface of the guide rail (6); a connecting frame (603) is fixedly installed on the top of the sliding seat (601); and the connecting frame (603) is fixedly connected to the back of the control panel (3).

7. A three-phase four-wire AC load box according to claim 6, characterized in that: An electric push rod (602) is also fixedly installed in the load box body (1), and one end of the electric push rod (602) is fixedly connected to the connecting frame (603).

8. A three-phase four-wire AC load box according to claim 7, characterized in that: A protection mechanism (5) is provided on one side of the load box body (1) close to the control panel (3), and the protection mechanism (5) comprises two protection parts provided on the load box body (1).

9. A three-phase four-wire AC load box according to claim 8, characterized in that: The protective member comprises a support seat (501) fixedly mounted on the front side of the load box body (1); a protective plate (503) is placed between the top of the support seat (501) and the load box body (1); a side groove (504) is provided on the side of the protective plate (503); a connecting shaft (505) is fixedly mounted in the side groove (504); a connecting seat (502) is sleeved on the outer surface of the connecting shaft (505); and one side of the connecting seat (502) is fixedly connected to the load box body (1).

10. A three-phase four-wire AC load box according to claim 9, characterized in that: A spring (506) is sleeved on the outer surface of the connecting shaft (505), and two ends of the spring (506) are in contact with the side groove (504) and the connecting seat (502) respectively.

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