WO2020118745A1

WO2020118745A1 - Novel fan junction box

Info

Publication number: WO2020118745A1
Application number: PCT/CN2018/122032
Authority: WO
Inventors: 魏武岗; 庞海洋; 张永强; 秦全卫; 王宇宁; 邹波; 杨华
Original assignee: 陕西航天西诺美灵电气有限公司
Priority date: 2018-12-11
Filing date: 2018-12-19
Publication date: 2020-06-18
Also published as: CN109672294A; CN109672294B

Abstract

The present invention relates to a novel fan junction box, at least comprising a cover panel and a box body, and characterized in that: the box body is a square box, a cable outlet port and a cable inlet port used to connect electrical cables are provided on a side wall of the box body, connection terminals are fixedly connected to the interior of the box body by means of screws, and electrical cables of the cable outlet port and the cable inlet port are respectively connected to the connection terminals, and the cover panel is sealedly and fixedly connected to the box body by means of screws. The present invention features a safe, dependable, simple, and lightweight structure, and excellent waterproofness. At the same time, the connection terminals are provided in the interior of the box body, allowing the connection terminals to be protected and improving the waterproofness of the junction box.

Description

A new fan junction box

Technical field

The invention relates to the technical field of transformers, in particular to a novel fan junction box.

Background technique

Transformer cooling fan is mainly used for radiator cooling system of extra large, medium and large transformers, which can increase the capacity of transformer and prolong the life of transformer. Since the transformer needs to be installed and used in the open air, the cooling fan must have good outdoor performance, and the electrical protection level must meet IP55.

DBF2 series transformer fan is a fan specially designed for transformer cooling system according to the People's Republic of China industry standard JB/T9642. The connection form of the fan is direct connection, the junction box is installed on the air cylinder, and the motor outlet leads into the terminal box from the bottom of the terminal box through the threading hole on the air cylinder and is fixed on the terminal. The structure of the junction box of the traditional DBF2 series transformer fan is shown in Figure 1 and Figure 2: It is mainly composed of a box cover 1, a base 2, a terminal 3, and a wire outlet 4, wherein the box cover 1 height of the junction box is 40mm, The height of the base 2 is 10 mm. The base 2 is fixed to the fan cylinder of the transformer fan by screws, the terminal 3 is fixed to the base 2 by screws, and the junction box cover 1 and the base 2 are connected by screws. When wiring, you need to pass the power cord into the outlet 4 of the box cover 1 and then connect it to the terminal 3 on the base 2. In this case, when the site is relatively narrow or the wiring head is short, the box cover 1 will It will cause impact. At the same time, when opening or closing the box cover 1, the base 2 is easy to cause collision, so that the terminal cannot be effectively protected; the motor leads must enter the terminal box from the opening at the bottom of the terminal box, and there is a base The opening is not tightly sealed, which leads to the risk of water ingress; and the junction box cover of the traditional DBF2 series transformer fan is large and bulky.

Summary of the invention

In order to solve the problems raised in the above background technology, the present invention provides a new type of fan junction box that is safe, reliable, simple, lightweight, and has good waterproof performance. One of the purposes is to ensure that the cover plate does not affect the wiring and can effectively Protect the terminal block; the second purpose is to have a good seal and ensure good waterproof and dustproof performance. The third purpose is to have the characteristics of high strength, thin thickness and light weight.

In order to achieve the above object, the present invention provides the following technical solution: a novel fan junction box, at least including a cover plate and a box body, the box body is a square body box, and the side wall of the box body is provided with an outlet for connecting a cable And the cable inlet, the inside of the box body is fixedly connected to the terminal block by screws, the cable wires of the cable outlet and the cable inlet are respectively connected to the terminal block, and the cover plate is sealed and fixedly connected to the box body by screws;

The outlet is located on the left side of the box, and the inlet is located in front of the box. The outlet is 90 degrees from the inlet; the outlet and inlet are of the same structure, and their outer ends protrude from the box to form a protrusion The bottom of the boss is semicircular, the top is flat, the middle is provided with a through hole, and the through hole is provided with an internal thread;

The bottom of the box body is provided with a cross-shaped mounting seat, one of the side walls of the box body is provided with a semi-cylindrical rib, and the top of the semi-cylindrical rib is provided with a grounding wire installation screw hole; the upper edge of the cross-shaped mounting seat Both horizontal and vertical are provided with terminal mounting holes. The terminal mounting holes are blind holes with threads. The terminal can be fixed on the cross-shaped mounting base horizontally or vertically by screws; it is useful to set them at the four corners of the bottom of the box. The connecting hole is cast on the mounting hole at the bottom of the box connected to the air cylinder or outside the box body, and a connecting hole for connecting with the air cylinder is provided on the connecting ear.

A waterproof cable lock for locking the cable is connected to the outlet and the inlet through threads.

The four corners of the end face of the box body are respectively provided with a cover plate mounting screw hole, and the cover plate mounting screw hole is a blind hole; the cover plate is provided with four cover plate mounting holes and four cover plate mounting holes and The four cover plate mounting screw holes correspond, and the cover plate mounting holes are through holes.

The cover plate is square, arc-shaped grooves are provided on the four corners of the upper surface of the cover plate, and four cover plate mounting holes are respectively provided in the four arc-shaped grooves; the lower surface of the cover plate is provided along all sides The bulge is provided with a cover plate gasket; the cover plate gasket has a mouth shape, and holes corresponding to the cover plate mounting holes are provided at the four corners thereof.

The connecting terminal is composed of a connecting plate, a connecting post, a connecting piece and a nut. The connecting post is 6 studs, which are divided into two rows on average and fixed on the connecting plate by a nut. There are 3 connecting pieces. Each terminal is fixed by nuts.

The bottom of the box body is an arc-shaped surface that is downward along the opening of the wire inlet.

A rubber pad of 3 cm to 5 cm is bonded to the outside of the bottom of the box body.

The material of the cover gasket is water-expandable expansion rubber; the water-expansion expansion rubber is composed of 100 parts of neoprene, 22 parts of clay, 6 parts of carbon black, 4 parts of magnesium chloride, and 2 parts of zinc oxide , 1 part rubber accelerator DM, 1 part anti-aging agent DFC-34, 5 parts stearic acid and 10 parts dizinc ester.

Compared with the prior art, the beneficial effects of the present invention are:

The cover plate and the box body of the present invention are made of aluminum metal die-casting, with high strength, thin thickness, light weight and simple structure. There is a cover gasket on the contact part between the inside of the cover and the box, which can ensure the tightness between the box and the cover and prevent water from entering the box from the outside; the terminal is fixed on the cross-shaped mounting seat in the box with screws , The installation direction can be changed as required; the inlet and outlet are integrally die-casted with the box body, and there is a semi-circular boss on the outside of the box body. Due to the thin wall of the box body, the boss can be added after adding the boss The internal tapping of the outlet and the outlet is convenient for installing a waterproof cable lock and increasing the waterproof performance. At the same time, the part of the boss near the bottom of the box is semi-circular, which is beneficial for demoulding during casting; A sealing rubber pad is installed between the bottom of the box and the outer wall of the air cylinder to make the two fit more closely and seamlessly, preventing water from entering the box from the outside through the mounting holes in the bottom of the box. When the mounting hole at the bottom of the box for connecting to the air cylinder is cancelled, the connection hole is formed on the connection ear because the connection ear is cast outside the box, and the connection to the air cylinder through the connection hole can reduce the opening on the box body. Holes, thereby reducing the passage of water from the outside, reducing the risk of water ingress, and sealing rubber pads can also be omitted. The connection terminal of the invention is arranged in the box body, and the wire can be connected before the cover plate is installed, so that the cover plate does not affect the connection and can effectively protect the connection terminal.

BRIEF DESCRIPTION

Figure 1 is a schematic diagram of the structure of the junction box of the traditional DBF2 series transformer fan;

Figure 2 is a schematic diagram of the cross-sectional structure of the base of the junction box of the traditional DBF2 series transformer fan;

3 is a front view of the structure of Example 2 of the present invention;

4 is a structural perspective view of Embodiment 2 of the present invention;

5 is a side view of the cover plate of the present invention;

6 is a bottom view of the cover plate of the present invention;

7 is a schematic structural view of the cover plate gasket of the present invention;

8 is a structural perspective view of Embodiment 4 of the present invention;

9 is a schematic diagram of the internal structure of the box of the present invention;

10 is a cross-sectional view of the inside of the box;

11 is a schematic diagram of the structure when there is no terminal inside the box;

12 is a schematic diagram of the structure of the terminal;

13 is a schematic diagram of the structure of the rubber pad at the bottom of the box.

In the picture: 1. Box cover; 2. Base; 3. Terminals; 4. Outlet; 5. Inlet; 6. Box body; 7. Cover plate; 8. Cover plate mounting hole; 9. Cover plate seal Cushion; 10. Cover plate mounting screw hole; 11. Ground wire mounting screw hole; 12. Box bottom mounting hole; 13. Rubber pad; 14. Connection plate; 15. Cross-shaped mounting seat; 16. Semi-cylindrical rib; 17. Terminal; 18, connecting piece; 19, nut; 20, terminal mounting hole.

detailed description

The present invention will be further described in detail below with reference to specific embodiments.

Example 1

A new fan junction box includes at least a cover plate 7 and a box body 6. The box body 6 is a square body box, and the side wall of the box body 6 is provided with a cable outlet 4 and a cable inlet 5 for connecting cables. The inside of the body 6 is fixedly connected to the terminal 3 by screws, the cable wires of the outlet 4 and the inlet 5 are connected to the terminal 3 respectively, and the cover 7 is sealed and fixedly connected to the box 6 by screws.

The cable line is divided into a power line and a motor lead, the outlet 4 is connected to an external power line, and the inlet 5 is connected to the motor lead. The invention is provided with a wire outlet 4 and a wire inlet 5, which avoids that the motor outlet wire needs to enter the junction box from the opening at the bottom of the junction box. There is a risk that the opening of the base is not tightly sealed, resulting in water ingress.

The connection terminal of the invention is arranged in the box body, and the wire can be connected before the cover plate is installed, so that the cover plate does not affect the connection and can effectively protect the connection terminal.

Example 2

Based on Embodiment 1, as shown in FIGS. 3 and 4, the outlet 4 is provided on the left of the box 6, the inlet 5 is provided in front of the box 6, and the outlet 4 and the inlet 5 are 90 degrees; the outlet 4 and the inlet 5 have the same structure, and their outer ends protrude from the box 6 to form a boss. The bottom of the boss is semi-circular, the top is flat, and there is a through hole in the middle. With internal thread.

The four corners of the end surface of the box body 6 are respectively provided with a cover plate mounting screw hole 10, and the cover plate mounting screw hole 10 is a blind hole; the cover plate 7 is provided with four cover

plate mounting holes

8, 4 The cover plate mounting holes 8 correspond to the four cover plate mounting screw holes 10, and the cover plate mounting holes 8 are through holes. The bottom of the box 6 is flat.

Example 3

On the basis of

Embodiment

1 or 2, the outlet 4 and the inlet 5 are connected with a waterproof cable lock for screwing the cable through a screw thread. The waterproof cable lock is a prior art and belongs to the well-known technology of those skilled in the art. It can be purchased on the market and online.

As shown in FIGS. 4, 5 and 6, the cover plate 7 is square, arc-shaped grooves are provided on the four corners of the upper surface of the cover plate, and four cover plate mounting holes 8 are respectively provided in four In the arc-shaped groove; the lower surface of the cover plate is provided with protrusions along the four sides, and the cover plate gasket 9 is provided in the protrusion; as shown in FIG. 7, the cover plate gasket 9 is in the shape of a mouth, at its four corners A hole corresponding to the cover plate mounting hole 8 is provided.

A cross-shaped mounting seat 15 is provided in the middle of the bottom of the box body 6, a semi-cylindrical rib 16 is provided on the inner side of one of the side walls of the box body 6, and a ground wire mounting screw hole 11 is provided on the top of the semi-cylindrical rib 16; The cross-shaped mounting base 15 is provided with terminal mounting holes 20 along the horizontal and vertical directions. The terminal mounting holes 20 are blind holes with threads. The terminal 3 can be fixed on the cross-shaped mounting base 15 horizontally or vertically by screws ; At the four corners of the bottom of the box 6, box bottom mounting holes 12 for connecting to the air cylinder or casting ears are cast outside the box 6, and connection holes for connecting to the air cylinder are provided on the connecting ears.

The terminal 3 is composed of a connecting plate 14, a connecting post 17, a connecting piece 18 and a nut 19. The connecting post 17 is 6 studs, which are equally divided into two rows and fixed on the connecting plate 14 by a nut 19. The connecting piece 18 Three of them are sleeved on three of the terminals 17 and fixed by nuts 19.

As shown in FIG. 13, a rubber pad 13 of 3 cm to 5 cm is adhered to the outside of the bottom of the case 6.

Example 4

As shown in FIG. 8, a new fan junction box includes at least a cover 7 and a box body 6. The box body 6 is a square body box, and the side wall of the box body 6 is provided with an outlet 4 for connecting a cable The wire inlet 5 and the inside of the box body 6 are fixedly connected to the terminal 3 by screws. The cable wires of the wire outlet 4 and the wire inlet 5 are connected to the terminal 3 respectively. The cover 7 is sealed and fixed to the box body 6 by screws The connection facilitates the installation and disassembly of the cover 7.

The wire outlet 4 is provided on the left side of the box body 6, the wire inlet 5 is provided in front of the box body 6, and the wire outlet 4 and the wire inlet 5 are at 90 degrees. Due to the oversize, the inlet 5 and outlet 4 cannot be set on the same side of the junction box. In order to achieve a good waterproof effect, the cable inlet 5 and the cable outlet 4 are located on the adjacent side of the box at 90 degrees, and the openings of the cable inlet 5 and the cable outlet 4 cannot be vertically upward. When the fan is used for blowing at the bottom, the inlet 5 is vertically downward to lock the cable with a waterproof connector to prevent water from flowing into the junction box, and the outlet 4 is located horizontally to lock the cable with a waterproof connector to prevent water ingress; when the fan is used for side-mounted blowing When the inlet 5 is in the horizontal direction, lock the cable with a waterproof connector to prevent water ingress, and the outlet 4 is vertically downward, and use the waterproof connector to lock the cable to prevent water ingress. The outlet 4 and the inlet 5 have the same structure, and their outer ends protrude from the box 6 to form a boss. The bottom of the boss is semicircular, the top is flat, and a through hole is provided in the middle. Thread.

The thickness of the cover plate 7 is 9 mm, the depth of the cover plate 7 is 4 mm, and the height of the box body 6 is 50 mm; the box body 6 is formed of an aluminum structure integrally formed with the outlet 4 and the inlet 5 The material of the cover 7 and the box 6 are the same. The cover plate and the box body are made of aluminum metal die-casting, with high strength, thin thickness, light weight and simple structure.

Because the inlet and outlet are integrally molded with the box body, the wall of the box is thin, and there is a semi-circular boss on the outside of the box body. After adding the boss, you can tap the threads in the inlet and outlet for easy installation Waterproof cable lock to increase the waterproof performance, and the part of the boss near the bottom of the box is semi-circular, which is beneficial for demoulding during casting.

The outlet 4 and the inlet 5 are connected with a waterproof cable lock for screwing the cable through a screw thread. The waterproof cable lock is a prior art and belongs to the well-known technology of those skilled in the art. Purchased on the market and online. By adding a waterproof cable lock, the airtightness of the incoming and outgoing wires is improved, thereby improving the waterproof performance of the junction box.

The four corners of the end face of the box body 6 are respectively provided with a cover plate mounting screw hole 10, and the cover plate mounting screw hole 10 is a blind hole. The use of the blind hole can reduce the passage of water from the outside into the junction box; the cover The plate 7 is provided with four cover plate mounting holes 8, and the four cover plate mounting holes 8 correspond to the four cover plate mounting screw holes 10, and the cover plate mounting holes 8 are through holes.

As shown in FIGS. 4, 5 and 6, the cover plate 7 is square, arc-shaped grooves are provided on the four corners of the upper surface of the cover plate, and four cover plate mounting holes 8 are respectively provided in four In the arc-shaped groove; the lower surface of the cover plate is provided with protrusions along the four sides, and the cover plate gasket 9 is provided in the protrusion; as shown in FIG. 7, the cover plate gasket 9 is in the shape of a mouth, at its four corners A hole corresponding to the cover plate mounting hole 8 is provided. A cover plate gasket is provided at the contact part between the inside of the cover plate and the box body, which can ensure the sealing between the box body and the cover plate and prevent water from entering the box from the outside.

As shown in FIGS. 9, 10 and 11, a cross-shaped mounting seat 15 is provided in the middle of the bottom of the box body 6, and a semi-cylindrical rib 16 is provided on the inner side of one of the side walls of the box body 6. The top is provided with a ground wire installation screw hole 11, which can be used to fix the ground wire on the screw to increase safety performance; the cross-shaped mounting base 15 is provided with a terminal mounting hole 20 along the horizontal and vertical directions, and a terminal mounting hole 20 For the blind hole with thread, the terminal 3 can be fixed on the cross-shaped mounting base 15 horizontally or vertically by screws. Since the cross-shaped mounting base is adopted, the installation direction of the terminal 3 can be changed as needed; at the bottom of the box 6 The four corners are respectively provided with box bottom mounting holes 12 for connecting the air cylinder.

As shown in FIG. 12, the terminal 3 is composed of a connecting plate 14, a connecting post 17, a connecting piece 18 and a nut 19. The connecting post 17 is 6 studs, which are divided into two rows on average and fixed to the connecting plate by nuts 19. On 14, there are three connecting pieces 18, which are sleeved on three of the terminals 17 and fixed by nuts 19.

As shown in FIG. 8, the bottom of the box body 6 is an arc-shaped surface that is downward along the opening of the wire inlet 5. The bottom is curved so as to fit the arc surface of the outer wall of the air cylinder.

As shown in FIG. 13, a rubber pad 13 of 3 cm to 5 cm is adhered to the outside of the bottom of the case 6. The invention is provided with a sealing rubber pad between the bottom of the box and the outer wall of the air cylinder, so that the two fit more closely and seamlessly.

Example 5

On the basis of Embodiment 4, a connecting ear is cast outside the box body 6, and a connecting hole for connecting with the air cylinder is provided on the connecting ear. After the mounting hole at the bottom of the box for connecting to the air cylinder is cancelled, the connecting hole is provided on the connecting ear because the connecting ear is cast outside the box, and the connecting hole is connected to the air cylinder, which can reduce the opening on the box body In order to reduce the passage of water from the outside and reduce the risk of water ingress, the sealing rubber pad can also be omitted.

When in use: first fix the box to the air cylinder, then pass the power cord and motor lead through the outlet 4 and inlet 5, respectively, connect the power cord and motor lead to the terminal of the terminal block, use a nut Press tightly. The star connection or delta connection can be changed by changing the installation position of the connection piece as needed. After the connection is completed, the cover plate 7 is fixed on the box body by screws to complete the sealing.

Example 6

On the basis of Example 2 or 3 or 4 or 5, the material of the cover gasket 9 is water-expandable expansion rubber. The water-expansion expansion rubber is composed of 100 parts of neoprene and 22 parts. It consists of clay, 6 parts carbon black, 4 parts magnesium chloride, 2 parts zinc oxide, 1 part rubber accelerator DM, 1 part anti-aging agent DFC-34, 5 parts stearic acid and 10 parts dizinc ester, all of which are mass fractions.

Although there is a gasket in the cover plate, if the screws are not tightened, a gap will appear between the cover plate and the box body, and water may flow into the junction box along the gap, causing electrical failure; and the cover plate gasket used in the present invention, Because the expansion material is used to expand with water, it can close the gap and prevent water from entering the box.

Claims

A novel fan junction box, at least including a cover plate (7) and a box body (6), characterized in that the box body (6) is a square body box, and the side wall of the box body (6) is provided for connecting cables The outlet (4) and inlet (5) of the cable, the inside of the box (6) is fixedly connected to the terminal (3) by screws, and the cables of the outlet (4) and the inlet (5) are connected to On the connection terminal (3), the cover plate (7) is fixedly connected with the box body (6) by screws;

The outlet (4) is located on the left side of the box (6), the inlet (5) is located in front of the box (6), the outlet (4) and the inlet (5) are at 90 degrees; the outlet (4) The structure is the same as that of the cable inlet (5), and their outer ends protrude from the box body (6) to form a boss. The bottom of the boss is semicircular, the top is flat, and a through hole is provided in the middle. With internal thread;

A cross-shaped mounting seat (15) is provided in the middle of the bottom of the box (6), and a semi-cylindrical rib (16) is provided on the inner side of one of the side walls of the box (6), on top of the semi-cylindrical rib (16) A grounding screw mounting hole (11) is provided; the cross-shaped mounting seat (15) is provided with a terminal mounting hole (20) along the horizontal and vertical directions, and the terminal mounting hole (20) is a blind hole with a thread , The terminal (3) can be fixed on the cross-shaped mounting seat (15) horizontally or longitudinally by screws; the bottom corners of the box body (6) are respectively provided with box bottom mounting holes (12) for connecting with the air cylinder Or a connecting ear is cast outside the box body (6), and a connecting hole for connecting with the air cylinder is provided on the connecting ear.
A novel fan junction box according to claim 1, characterized in that: the outlet (4) and the inlet (5) are connected with a waterproof cable lock for locking the cable through a screw thread.
A novel fan junction box according to claim 1, characterized in that: four corners of the end face of the box body (6) are respectively provided with a cover plate mounting screw hole (10), and the cover plate mounting screw hole ( 10) It is a blind hole; the cover plate (7) is provided with four cover plate mounting holes (8), and the four cover plate mounting holes (8) correspond to the four cover plate mounting screw holes (10). The cover plate mounting hole (8) is a through hole.
A novel fan junction box according to claim 3, characterized in that the cover plate (7) is square, arc-shaped grooves are provided on the four corners of the upper surface of the cover plate, and four cover plates are installed The holes (8) are respectively arranged in four arc-shaped grooves; the lower surface of the cover plate is provided with protrusions along the four sides, and the cover plate gasket (9) is provided in the protrusion; the cover plate gasket (9) is an opening In the shape of a letter, four corners are provided with holes corresponding to the mounting holes (8) of the cover plate.
A new fan junction box according to claim 1, characterized in that the terminal (3) is composed of a connecting plate (14), a terminal (17), a connecting piece (18) and a nut (19) The terminal (17) is 6 studs, which are divided into two rows on average and fixed on the connecting plate (14) by nuts (19). There are 3 connecting pieces (18), which are sleeved on 3 terminals (17) ), and fixed by nuts (19).
A novel fan junction box according to claim 1, characterized in that: the bottom of the box body (6) is an arc-shaped surface with an opening downward in the direction of the wire inlet (5).
A novel fan junction box according to claim 1, characterized in that a rubber pad (13) of 3 cm to 5 cm is bonded to the outside of the bottom of the box body (6).
A novel fan junction box according to claim 4, characterized in that: the material of the cover gasket (9) is water-expandable expansion rubber; the water-expansion expansion rubber is composed of 100 parts It consists of neoprene, 22 parts of clay, 6 parts of carbon black, 4 parts of magnesium chloride, 2 parts of zinc oxide, 1 part of rubber accelerator DM, 1 part of antioxidant DFC-34, 5 parts of stearic acid and 10 parts of dizinc ester.