CN215009463U

CN215009463U - Filter junction box

Info

Publication number: CN215009463U
Application number: CN202023127736.5U
Authority: CN
Inventors: 仰小平; 邓勇
Original assignee: Mcquay Air Conditioning and Refrigeration Wuhan Co Ltd
Current assignee: Mcquay Air Conditioning and Refrigeration Wuhan Co Ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2021-12-03
Anticipated expiration: 2030-12-23

Abstract

The utility model discloses a filter junction box, wherein a junction box body comprises a top plate (1) and a box body (2); the method is characterized in that: the insulation plate (3) is arranged on the inner side of the box body (2) through a screw (5), the insulation sealing gasket (6) is bonded on the insulation plate (3), and the insulation sealing gasket (6) is arranged between the insulation plate (3) and the box body (2); the locking cable joint (4) is arranged on the insulating plate (3) through the wiring hole (8). Vortex heating can not occur, and the temperature of the junction box is reduced. The protection grade of the electric shell can reach IP68, the protection grade is improved, and devices in the shell are better protected. The power cable can be laid in a bare line without penetrating a pipe or reducing the current-carrying capacity of a cable of the bridge, and is low in cost and convenient to construct.

Description

Filter junction box

Technical Field

The utility model belongs to the technical field of the high-speed drive of frequency conversion, concretely relates to high protection level, high frequency low-cost wave filter terminal box.

Background

With economic development, energy efficiency and environmental protection, central air conditioners tend to be frequency-variable and frequency-variable cabinets are applied more and more in order to save energy, reduce emission and pursue energy efficiency ratio. The frequency conversion cabinet driving motor has the advantages that the rotating speed of the motor is faster and faster, the frequency converter output current frequency is higher and higher, eddy current heating can be generated on a power line through a common metal (ferromagnetic metal, such as Q235) shell under the high-frequency condition, in order to inhibit the eddy current heating, a three-phase power cable is generally inserted into a junction box when the power line is connected, the eddy current heating is inhibited by the principle that magnetic fields are mutually counteracted, and the capacity reduction treatment is needed when the power line is laid in a penetrating mode, so that the cost is higher.

The traditional wire inlet structure of the junction box is shown in figures 1-3, the protection level of a junction box shell 1 is limited by the protection level of a hose 2, and the protection level of the hose laying can only reach IP 54.

Power line current-carrying capacity: when the flexible pipe 2 is laid with cables, the capacity reduction coefficient needs to be considered, and the formula according to the industrial and civil power distribution design manual is as follows: and Ip =0.78854 × Ia (Ia is the cable carrying capacity and Ip is the cable carrying capacity after pipe penetration), which is equivalent to 78.9% of the cable capacity reduction, and the use cost is high.

And (3) field construction: the hose is laid, the power line 4 penetrates through the hose 2, then the power line and the hose are connected together, and the power line and the hose are combined with the shell 1 through the hose connector 3, so that the hose is heavy and inconvenient to construct; equipment size: the bending radius of the hose needs to be considered when the hose is laid on site, and the size of equipment is influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to can only reach IP54, power line cabling to current terminal box protection level and need fall the inconvenient scheduling problem of appearance cost height, construction, provide a high protection level, high frequency, low-cost wave filter terminal box to overcome above-mentioned technical defect.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a filter junction box comprises a junction box body, a top plate (1) and a box body (2); the method is characterized in that: the insulation plate (3) is arranged on the inner side of the box body (2) through a screw (5), the insulation sealing gasket (6) is bonded on the insulation plate (3), and the insulation sealing gasket (6) is arranged between the insulation plate (3) and the box body (2); the locking cable joint (4) is arranged on the insulating plate (3).

Among the above-mentioned technical scheme, insulating sealing gasket (6) one side bonds on insulation board (3), and insulating sealing gasket (6) periphery round surrounds 6 wiring hole (8).

In the technical scheme, each wiring hole (8) is provided with a locking cable joint (4) for locking and locking the power line (7).

In the technical scheme, the bare wires of the power wires (7) are laid through the locking cable joint (4).

In the technical scheme, a single cable of the power line (7) is laid and penetrates through the locking cable joint (4).

In the technical scheme, the top plate (1) is installed on the box body (2) through the screw (5).

In the technical scheme, power lines T1 and T4 are connected with a power line L1, power lines T2 and T5 are connected with a power line L2, and power lines T3 and T6 are connected with a power line L3; each three-phase power supply line L1, L2, L3 is arranged in a closed wiring hole (8).

In the technical scheme, the insulating sealing gasket (6) is a rubber sealing gasket.

In the technical scheme, the protection grade of the locking cable joint (4) is IP68, and the protection grade reaches IP68 after the insulating sealing gasket (6) and the box body (2) are overlapped.

1. The power cable can be laid without capacity reduction, and the current-carrying capacity is improved by 1.27 times compared with that of a power line laid through a pipe; bare wires are wired, and a single cable is laid, so that construction is facilitated; and (4) laying bare wires, only considering the bending radius of the cable, and reducing the size of the equipment.

2. The special-shaped hole is designed to be matched with the cable connector, so that the three-phase power cable can penetrate into one hole, eddy current heating cannot occur, and the temperature of the junction box is reduced.

3. Design insulation board, rubber seal pad cooperation cable joint, make electric casing protection level can reach IP68, improve protection level, better protection casing internal component.

4. The cable joint and the insulating plate with high protection grade are selected for use, so that the power cable can be laid in a bare line without pipe penetration or capacity reduction of the current-carrying capacity of a cable of a bridge, the cost is low, and the construction is convenient.

Drawings

Fig. 1 is a schematic diagram of a junction box wire inlet structure in the prior art.

Fig. 2 is a side view of fig. 1.

Fig. 3 is a schematic view of the power line threading in fig. 1.

Fig. 4 is a schematic structural diagram of the junction box of the filter of the present invention.

Fig. 5 is another view structure diagram of fig. 4.

Fig. 6 is a schematic diagram of the power line perforation of the present invention.

Fig. 7 is a schematic view of the insulating plate of the present invention.

Fig. 8 is a side view of fig. 7.

Fig. 9 is a schematic diagram of the power line perforation according to the present invention.

Detailed Description

According to the filter junction box of the present invention, as shown in fig. 3-9, the junction box body comprises a top plate (1) and a box body (2); the top plate (1) is arranged on the box body (2) through a screw (5); as shown in the figure, an insulating plate (3) is arranged on the inner side of a box body (2) through a screw (5), one surface of an insulating sealing gasket (6) is adhered to the insulating plate (3), and the insulating sealing gasket (6) is arranged between the insulating plate (3) and the box body (2); the locking cable joint (4) is arranged on the insulating plate (3).

Referring to fig. 7 to 8, one side of the insulating gasket (6) is adhered to the insulating plate (3), and 6 wiring holes (8) are surrounded by one turn of the periphery. Each wiring hole is provided with a locking cable joint (4).

And laying a single cable of the power line (7), and laying a bare wire of the power line (7) to penetrate through the locking cable joint (4). And tightening and locking the cable joint (4) to lock the power line (7).

The insulating seal (6) is preferably a rubber seal.

The shell protection grade is as follows: the protection grade of the locking cable joint (4) is IP68, the protection grade of the shell is enhanced by the insulating sealing gasket (6), and the protection grade of the shell reaches IP 68.

Power line current-carrying capacity: the power line (7) can be laid in a bare line without capacity reduction, and the current-carrying capacity of the power line is improved by 1.27 times compared with that of a power line laid through a pipe.

And (3) field construction: bare wires are wired, and a single cable is laid, so that construction is facilitated; meanwhile, as the bare wires are laid, only the bending radius of the cable is considered, and the equipment is small in size.

As shown in the schematic diagram of power line perforation in fig. 9, we also design a special-shaped hole to match with a cable connector, three power lines penetrate into three communicated circular holes respectively, each power line is connected with its own power line, and the three-phase power lines are all in a closed wiring hole 8. That is, when the power line T1/2/3 penetrates, the actual three-phase current magnetic field is in a communicated circular hole, and the magnetic field can be counteracted without generating eddy current heating. Power lines T1 and T4 are connected with a power supply L1, power lines T2 and T5 are connected with a power supply L2, and power lines T3 and T6 are connected with a power supply L3; therefore, the three-phase power lines (L1, L2 and L3) are all arranged in a closed wiring hole 8, magnetic fields are superposed, and no eddy current heating occurs.

The unexplained parts related to the scheme of the present invention are the same as or implemented by using the prior art, and those skilled in the art can simply change or select the unexplained parts, all of which are within the protection scope of the present invention.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the special-shaped hole is designed to be matched with the cable connector, so that a three-phase power cable can penetrate into one hole, eddy current heating cannot occur, and the temperature of the junction box is reduced;

2, designing an insulating plate and a rubber sealing gasket to be matched with a cable joint, so that the protection grade of the electric shell can reach IP68, the protection grade is improved, and devices in the shell are better protected;

3. the cable joint and the insulating plate with high protection grade are selected for use, so that the power cable can be laid in a bare line without pipe penetration or capacity reduction of the current-carrying capacity of a cable of a bridge, the cost is low, and the construction is convenient.

Claims

1. A filter junction box comprises a junction box body, a top plate (1) and a box body (2); the method is characterized in that: the insulation plate (3) is arranged on the inner side of the box body (2) through a screw (5), the insulation sealing gasket (6) is bonded on the insulation plate (3), and the insulation sealing gasket (6) is arranged between the insulation plate (3) and the box body (2); the locking cable joint (4) is arranged on the insulating plate (3) through the wiring hole (8).

2. The filter junction box of claim 1, wherein: one side of the insulating sealing gasket (6) is adhered to the insulating plate (3), and 6 wiring holes (8) are surrounded by one circle of the periphery of the insulating sealing gasket (6).

3. The filter junction box of claim 1, wherein: each wiring hole (8) is provided with a locking cable joint (4) used for locking the power line (7).

4. The filter junction box of claim 1, wherein: the bare wire of the power wire (7) is laid and passes through the locking cable joint (4).

5. The filter junction box of claim 1, wherein: and a single cable of the power line (7) is laid and passes through the locking cable joint (4).

6. The filter junction box of claim 1, wherein: the top plate (1) is arranged on the box body (2) through a screw (5).

7. The filter junction box of claim 1, wherein: power lines T1 and T4 are connected with a power supply L1, power lines T2 and T5 are connected with a power supply L2, and power lines T3 and T6 are connected with a power supply L3; each three-phase power line L1, L2 and L3 is arranged in a closed wiring hole (8).

8. The filter junction box of claim 1, wherein: the insulating sealing gasket (6) is a rubber sealing gasket.

9. The filter junction box of claim 1, wherein: the protection grade of the locking cable joint (4) is IP68, and the protection grade reaches IP68 after the insulating sealing gasket (6) and the box body (2) are overlapped.