An auxiliary heating junction box for a high-efficiency flameproof three-phase asynchronous motor of YBX4

Abstract

The present invention discloses a YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box, belonging to the technical field of flameproof motor junction boxes. The junction box comprises a junction box seat, a junction box bucket connected to one side of the junction box seat, and a junction box cover connected to the upper portion of the junction box seat. The junction box seat is internally provided with a wiring component, which comprises a terminal sleeve die-cast integrally with the junction box seat, a wiring mounting plate disposed on the upper portion of the terminal sleeve, and wiring bolts extending through the terminal sleeve and the wiring mounting plate. The present invention solves the technical problems of conventional flameproof motor auxiliary junction boxes being large in size and occupying a large space. The present invention has a compact structure, a small size, separates strong and weak currents, has good electrical performance, greatly reduces costs, can meet the wiring requirements of various models, and provides convenient wiring for the heater of the YBX4 high-efficiency flameproof three-phase asynchronous motor. The wiring bolts are easy to install and replace, significantly improving wiring efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of flameproof motor junction boxes, and in particular to a YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box. Background Art

[0002] Flameproof three-phase asynchronous motors are characterized by high efficiency, energy saving, large temperature rise margin, long life, good performance, low noise, low vibration, and high reliability. As the motor market continues to expand, competition is becoming increasingly fierce, and the requirements for motors are gradually becoming more refined. When motors are operated or stored in humid environments, they are easily affected by moisture, which will affect the insulation performance, making the flameproof motor prone to reduced insulation resistance, electrical breakdown or leakage, destroying the explosion-proof safety of increased safety and spark-free equipment, and also adversely affecting the operational safety of flameproof motor equipment. In addition, humid environments can cause rust on the flameproof joints of flameproof explosion-proof motors, which has an adverse effect on explosion-proof safety. Therefore, it is generally necessary to install a heater in the motor, and a matching junction box is also required. In the existing technology, the junction box is large in size and inconvenient to connect. Therefore, it is necessary to develop a dedicated heating junction box.

[0003] Patent publication number CN 204190540 U discloses a simplified flameproof heating junction box, overcoming the structural issues of existing flameproof motor stator heating power supply junction boxes. The junction box consists of a housing, a mounting base, and a cover. The upper portion of the housing is connected to the cover, while the lower portion is sleeved onto the mounting base. The outlet on one side of the housing is equipped with an explosion-proof gland. The housing houses a hollow integral insulating plate, which sleeves a terminal bolt. Nuts are attached to the upper ends of the terminal bolts. This junction box crimps the leads onto the terminal bolts and secures them directly with nuts, resulting in poor electrical performance.

[0004] Patent document CN 103516114 A discloses a flameproof auxiliary junction box for a four-stage flameproof three-phase asynchronous motor, belonging to the technical field of flameproof wiring for three-phase asynchronous motors. The flameproof auxiliary junction box for a four-stage flameproof three-phase asynchronous motor comprises a junction box base and several wire inlets and outlets located on the base. A baffle is provided within the base, forming a weak current wiring area and a strong current wiring area within the base. The weak current wiring area is provided with a bearing temperature measurement terminal block and a stator temperature measurement terminal block, while the strong current wiring area is provided with a heater terminal block. The base is provided with junction box covers, respectively, to enclose the weak current wiring area and the strong current wiring area. This junction box is relatively large, making wiring inconvenient. Summary of the Invention

[0005] In view of this, the present invention provides a YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box, comprising a junction box seat, a junction box bucket connected to one side of the junction box seat, and a junction box cover connected to the upper part of the junction box seat; a junction box component is provided inside the junction box seat, and the junction box component includes a terminal sleeve die-casted integrally with the junction box seat, a junction mounting plate arranged on the upper part of the terminal sleeve, and a junction bolt passing through the terminal sleeve and the junction mounting plate.

[0008] Furthermore, the junction box seat is fixedly mounted on the motor base via a first bolt, and a first washer is provided on the second bolt.

[0009] Furthermore, a grounding bolt is provided in the junction box seat, and a second washer, a third washer and a nut are provided on the grounding bolt.

[0010] Furthermore, the junction box seat and the junction box cover are both hexagonal structures that fit together. An O-ring is provided between the junction box seat and the junction box cover, and they are fixedly connected by a second bolt, and a fourth washer is provided on the second bolt.

[0011] Furthermore, a positioning groove is provided at the bottom of the junction box seat, the terminal sleeve is die-cast on the junction box seat through the positioning groove, a first through hole is provided inside the terminal sleeve, and a second through hole is provided on the junction mounting plate.

[0012] Furthermore, the wiring bolt passes through the first through hole and the second through hole, and the wiring bolt is provided with the nut, the second washer, the third washer and the bow-shaped washer.

[0013] Furthermore, a wiring terminal and a lead wire are provided at the lower portion of the wiring bolt.

[0014] Furthermore, the junction box bucket includes a sealing ring and a metal washer provided at the connection with the junction box seat, and a compression nut at the end.

[0015] Furthermore, a first explosion-proof surface is provided between the junction box cover and the junction box seat, and a second explosion-proof surface is provided between the junction box seat and the terminal sleeve.

[0016] Conventional flameproof motors utilize a single stator temperature sensor and heater junction box. This shared junction box connects the flameproof three-phase asynchronous motor's stator temperature sensor and heater to the control cabinet, and also connects the motor heater to the power supply. The stator temperature sensor and heater leads are threaded through threaded bushings and then routed to a terminal block within the junction box. External motor leads are routed to the terminal block via flameproof sealed cable connectors.

[0017] For example, patent publication number CN 202183678 U discloses a flameproof junction box that integrates stator temperature measurement, bearing temperature measurement, and stator heating. The junction box includes a junction box seat, a temperature measurement terminal block, and heater terminals. The junction box seat is divided into independent temperature measurement and heating chambers. The temperature measurement terminal block is located in the temperature measurement chamber, and the heater is located in the heating chamber. Stator temperature measurement terminal blocks and bearing temperature measurement terminal blocks are respectively provided on the side walls of the temperature measurement chamber, and a heater terminal block is provided on the side walls of the heating chamber. This design results in a large junction box and requires a distinction between the temperature measurement terminal block and the heater terminals, making wiring inconvenient.

[0018] Patent publication number CN209313605U discloses a pre-wired motor temperature measurement or heater terminal box. The terminal blocks are fixed inside the box, and a cable gland is attached to the box. A wire inserted from the bottom of the box is connected to the terminal blocks at one end, while the other end is reserved outside the box for connection to the motor's temperature measurement or heater wires. The connection between the wire and the bottom of the box is sealed with a cast or sealing ring. This type of terminal box requires resin encapsulation, which is inconvenient, inefficient, and difficult to replace.

[0019] Therefore, those skilled in the art would not readily consider using plastic materials to manufacture terminal components. Instead, they would typically simply connect the wires directly to the terminal bolts and secure them with nuts. However, this type of connection can easily loosen the wires, and washers are often added to address this problem, but the locking effect is still unsatisfactory.

[0020] The beneficial effects of the present invention are:

[0021] The present invention's junction box base is internally equipped with wiring components, including a terminal sleeve, a wiring mounting plate, and terminal bolts. The terminal sleeve is die-cast onto the junction box base, reducing the size of the junction box and increasing electrical clearance. The wiring mounting plate is mounted at the end of the terminal sleeve, increasing creepage distance and saving space. The terminal bolts pass through the terminal mounting plate and terminal sleeve for easy replacement. Terminals and lead wires are located at their lower ends for connection to the heater. The terminals are tin-ring heat-shrinkable terminals that shrink upon heating, making wiring very convenient. The junction box base is fixed to the motor base with bolts. A grounding bolt is located within the base for easy grounding, enhancing the safety of flameproof motors. The junction box base and junction box cover are both hexagonal structures that fit together, increasing the space within the junction box. A sealing ring is installed between the junction box base and the junction box cover, which are secured together by bolts. A first flameproof surface is provided between the junction box cover and the junction box base, and a second flameproof surface is provided between the junction box base and the terminal sleeve, enhancing safety. Reasonable electrical clearance is maintained between the upper ends of the terminal bolts and the junction box cover, as well as between adjacent terminal bolts, ensuring good electrical performance.

[0022] The present invention solves the technical problems of large size and large space occupied by previous flameproof motor auxiliary junction boxes. It has a compact structure, small size, separation of strong and weak electricity, good electrical performance, greatly reduces costs, can meet the wiring requirements of various models, and provides convenient wiring for the heater of the YBX4 high-efficiency flameproof three-phase asynchronous motor; the wiring bolts are easy to install and replace, which significantly improves the wiring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in further detail below with reference to the accompanying drawings.

[0024] Figure 1 It is a main sectional view of the junction box of the present invention.

[0025] Figure 2 It is a top half-section view of the junction box of the present invention.

[0026] Figure 3 It is a front sectional view of the junction box seat of the present invention.

[0027] Figure 4 It is a top half-section view of the junction box seat of the present invention.

[0028] Figure 5 It is a front sectional view of the wiring installation plate of the present invention.

[0029] Figure 6 It is a top view of the wiring mounting plate of the present invention.

[0030] The meanings of the reference numerals are as follows:

[0031] 1: First bolt, 2: First washer, 3: Junction box cover, 4: Junction box base, 5: Pressing nut, 6: Metal washer, 7: O-ring, 8: Sealing ring, 9: Junction bolt, 10: Nut, 11: Second washer, 12: Third washer, 13: Bow washer, 14: Junction mounting plate, 15: Lead wire, 16: Terminal, 17: Grounding bolt, 18: First explosion-proof surface, 19: Second explosion-proof surface, 20: Junction box bucket, 21: Explosion-proof label, 22: Terminal sleeve, 23: Second bolt, 24: Fourth washer. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1-6 , clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments derived by ordinary technicians in this field fall within the scope of protection of the present invention. Example

[0033] See Figure 1-6 This embodiment provides a YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating terminal box, including a terminal box seat 4, a terminal box bucket 20 connected to one side of the terminal box seat 4, and a terminal box cover 3 connected to the upper part of the terminal box seat 4; the terminal box seat 4 is provided with a terminal component inside, and the terminal component includes a terminal sleeve 22 die-casted integrally with the terminal box seat 4, a terminal mounting plate 14 arranged on the upper part of the terminal sleeve 22, and a terminal bolt 9 passing through the terminal sleeve 22 and the terminal mounting plate 14.

[0034] The junction box seat 4 is fixedly mounted on the motor seat by a first bolt 1 , and a first washer 2 is provided on the first bolt 1 .

[0035] A grounding bolt 17 is provided in the junction box seat 4 , and a second washer 11 , a third washer 12 and a nut 10 are provided on the grounding bolt 17 .

[0036] The junction box seat 4 and the junction box cover 3 are both hexagonal structures that cooperate with each other. An O-ring 7 is provided between the junction box seat 4 and the junction box cover 3, and they are fixedly connected by a second bolt 23. A fourth washer 2 is provided on the second bolt 23.

[0037] A positioning groove is provided at the bottom of the junction box seat 4 , and the terminal sleeve 22 is die-cast on the junction box seat 4 through the positioning groove. A first through hole is provided inside the terminal sleeve 22 , and a second through hole is provided on the wiring mounting plate 14 .

[0038] The terminal bolt 9 passes through the first through hole and the second through hole. The terminal bolt is provided with the nut 10 , the second washer 11 , the third washer 12 and the bow-shaped washer 13 .

[0039] The lower portion of the terminal bolt 9 is provided with a terminal 16 and a lead wire 15 .

[0040] The first and second bolts 1 and 22 are both M6×20, galvanized. The first, second, and fourth washers 2, 11, and 24 are made of 65Mn. The O-ring 7 is made of I-4 oil-resistant rubber, providing a good oil seal. The terminal bolts 9, nuts 10, and bow washers 13 are all made of H62. The third washer 12 is 140Hv galvanized.

[0041] The junction box cover 3, the junction box seat 4, and the junction box bucket 20 are all made of HT250. The junction box seat 4 and the junction box cover 3 are both hexagonal structures that cooperate with each other to increase the space inside the junction box.

[0042] The wiring mounting plate 14 and the terminal cover 22 are made of glass fiber molded plastic. Figure 3 As shown, the terminal mounting plate 14 is die-cast in the positioning groove on the terminal box base 4, and is set at the end of the terminal sleeve 22, which stops and prevents rotation, making installation easy. The terminal mounting plate 14 is enclosed by side walls and a bottom plate. The interior is hollow, with one side of the side wall open. A second through hole is set in the bottom plate of the terminal mounting plate 14. The height of the side wall is lower than the terminal bolt. This design can increase the creepage distance and reduce the net volume of the cavity.

[0043] Grounding bolt 17 is galvanized and passivated. Lead wire 15 is a 125°C cross-linked polyolefin lead wire, and terminal 16 is an SST-S11 tin ring heat shrink terminal. Two terminal bolts 9 are provided, and this is a dedicated junction box for two-phase electric heaters. This invention is suitable for YBX4 high-efficiency flameproof three-phase asynchronous motors with frame sizes of 250-355, a rated operating voltage of 220V, and an IP55 protection grade. Example

[0044] See Figure 1-6 This embodiment provides a YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box, which is an improvement on the basis of Example 1:

[0045] A first flameproof surface 18 is provided between the junction box cover 3 and the junction box seat 4: L ≥ 11, ic ≤ 0.15; the upper and lower ends of the terminal sleeve 22 extend out of the junction box seat 4, wrapping the lower part of the junction box seat 4, and a second flameproof surface 19 is provided between the junction box seat 4 and the terminal sleeve 22: L ≥ 28, ic ≤ 0.2. The net volume of the junction box is ≤ 500cm 3 . Example

[0046] See Figure 1-6 This embodiment provides a YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box, which is an improvement on the basis of Example 2: the junction box bucket 20 includes a sealing ring 8 and a metal washer 6 provided at the connection with the junction box seat 4, and a clamping nut 5 at the end. The wire enters the junction box bucket 20, is connected to the terminal bolt 9, and is tightened with the clamping nut 5, which is easy to operate. The sealing ring 8 is made of nitrile rubber, and the material of the clamping nut 5 and the metal washer 6 are both Q235A. An explosion-proof mark 21 is provided on the junction box cover 3. The present invention can meet the requirements of ExdⅠMb and ExdⅡB T4 Gb.

[0047] In the description of the present invention, it should be understood that relational terms such as "one" and "two" are used solely to separate one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Terms such as "length," "width," "upper," "lower," "left," "right," "vertical," and "horizontal" to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on the present invention.

[0048] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box, comprising a junction box seat, a junction box bucket connected to one side of the junction box seat, and a junction box cover connected to the upper portion of the junction box seat; characterized in that: A wiring component is provided inside the junction box seat, and the wiring component includes a terminal sleeve die-casted integrally with the junction box seat, a wiring mounting plate arranged on the upper portion of the terminal sleeve, and a wiring bolt passing through the terminal sleeve and the wiring mounting plate; The bottom of the junction box seat is provided with a positioning groove, the terminal sleeve is die-cast on the junction box seat through the positioning groove, the interior of the terminal sleeve is provided with a first through hole, and the wiring mounting plate is provided with a second through hole; The wiring mounting plate is formed by a side wall and a bottom plate, is hollow inside, one side of the side wall is open, the second through hole is provided on the bottom plate, and the height of the side wall is lower than the wiring bolt; The junction box seat and the junction box cover are both hexagonal structures that fit together. An O-ring is provided between the junction box seat and the junction box cover, and they are fixedly connected by a second bolt, and a fourth washer is provided on the second bolt; A first explosion-proof surface is set between the junction box cover and the junction box seat: L≥11, ic≤0.15; the upper and lower ends of the terminal sleeve extend out of the junction box seat, wrapping the lower part of the junction box seat, and a second explosion-proof surface is set between the junction box seat and the terminal sleeve: L≥28, ic≤0.2; the net volume of the junction box is ≤500cm 3 .

2. A YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box as claimed in claim 1, characterized in that: The junction box seat is fixedly mounted on the motor base via a first bolt, and a first washer is provided on the first bolt.

3. A YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box as claimed in claim 2, characterized in that: A grounding bolt is provided in the junction box seat, and a second washer, a third washer and a nut are provided on the grounding bolt.

4. A YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box as claimed in claim 3, characterized in that: The terminal bolt passes through the first through hole and the second through hole, and the terminal bolt is provided with the nut, the second washer, the third washer and the bow-shaped washer.

5. A YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box as claimed in claim 4, characterized in that: The lower part of the wiring bolt is provided with a wiring terminal and a lead wire.

6. A YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary heating junction box as claimed in claim 5, characterized in that: The junction box bucket includes a sealing ring and a metal washer provided at the connection with the junction box seat, and a compression nut at the end.

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