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

Abstract

The present invention relates to the technical field of flameproof motor junction boxes, and specifically to a YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary temperature measurement junction box, comprising a junction box seat, a terminal block arranged inside the junction box seat, a wire-passing device fixed to the bottom of the junction box seat, four junction box buckets respectively provided on both sides of the junction box seat, and a junction box cover connected to the upper portion of the junction box seat, wherein the junction box seat and the junction box cover are hexagonal structures, the wire-passing device is connected to the bottom of the terminal, and the junction box bucket is provided with a clamping nut, a metal plug, a sealing ring, and a metal washer in sequence from the outside to the inside. The device of the present invention has excellent sealing performance, good wiring effect, simple structure, convenient wiring, and easy stator replacement. It can simultaneously meet the use requirements of the motor bearing and stator temperature measurement, ensuring the safety and reliability of the operation of the YBX4 high-efficiency flameproof three-phase asynchronous motor temperature measurement junction box.

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 temperature measurement junction box. Background Art

[0002] Flameproof three-phase asynchronous motors are widely used as prime movers in explosive gas environments, such as in the coal, petroleum, and chemical industries, to drive various general-purpose machinery. Therefore, their safety and reliability are significantly more critical than those of conventional motors. Stator temperature measurement is a method of motor protection. When integrated into a control system, it monitors the temperature of the motor windings. Temperature anomalies trigger an alarm or even shut down the motor, protecting the motor while preventing high temperatures from igniting surrounding explosive gases. However, the stator temperature measurement element in existing motors is sealed inside a junction box. Therefore, when a problem with the equipment requires replacement, the junction box must be removed to replace the stator element.

[0003] The utility model, with authorization announcement number CN201717718U, discloses an explosion-proof temperature measurement junction box. The junction box is fixed to the motor base. The inner cavity of the junction box is equipped with connectors for bearing temperature measurement leads and stator temperature measurement leads. The left side of the junction box has a bearing temperature measurement lead inlet, which passes through the lead inlet and connects to the connector. The lower portion of the junction box has a lead inlet with a groove. The stator temperature measurement lead is led out from the inside of the motor and connected to the stator temperature measurement connector. The right side of the junction box has a temperature measurement outlet hopper, from which the connector leads are led. The connection surfaces between the various components are all explosion-proof structures. This device installs the temperature measurement device in the junction box. If the temperature measurement structure in the device is damaged, it is difficult to directly repair it. Wiring requires tightening with a screwdriver, which is inconvenient.

[0004] The utility model, with authorization publication number CN205864156U, provides a common junction box for motor stator temperature measurement and heaters. The box includes a junction box base and a terminal block mounted on the base. The terminal block is provided with wiring terminals. The junction box base is threadedly connected to a threaded sleeve, which is provided with wire entry holes. The number of wire entry holes is the same as the number of wires for the stator temperature measurement and heater leads inside the motor. The stator temperature measurement and heater leads inside the motor pass through the wire entry holes and connect to the wiring terminals on the terminal block. The wiring terminals of this device are located on the terminal block inside the junction box, making them difficult to replace. Summary of the Invention

[0005] In view of this, the present invention provides a YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary temperature measurement 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 temperature measurement junction box includes a junction box base, a terminal block disposed within the base, a wire feeder secured to the base's bottom, a junction box bucket disposed above the base, and a junction box cover connected to the base's upper portion. The base and cover are hexagonal in structure. The wire feeder is connected to a terminal at the bottom, and the base's bucket is equipped with a compression nut, a metal plug, a sealing ring, and a metal washer, arranged in sequence from the outside inward.

[0008] Furthermore, the junction box seat and the junction box cover are connected by a first O-ring, four first bolts are provided on the top of the junction box cover, a first gasket is added to the first bolt, the junction box cover is fixed to the junction box seat by the first bolts, and a positioning groove composed of two fixing plates is provided at the same horizontal plane inside the junction box seat, and the junction plate is fixed to the inside of the junction box body by clamping the positioning groove.

[0009] Furthermore, the terminal block includes a mounting plate and plug-in terminals fixed on the mounting plate, and second bolts are provided on both sides of the mounting plate, and second gaskets are installed on the second bolts.

[0010] Furthermore, the wire passing device is composed of an elliptical plate, a first cylindrical structure, a second cylindrical structure and a first nut fixed in sequence, the cross-sectional radius of the first cylindrical structure is larger than the cross-sectional radius of the second cylindrical structure, the first cylindrical structure is a hollow cylinder, the second cylindrical structure is a hollow stud, the first nut is arranged on the outer surface of the second cylindrical structure, and a first washer is provided on the first nut, six circular holes are opened on the elliptical plate, the circular holes pass through the wire passing device, and the inside of the channel formed by the circular holes is paved with insulating material.

[0011] Furthermore, a third bolt is provided at the bottom of the junction box seat, and a third gasket is installed on the third bolt for fixing the temperature measuring junction box to the motor.

[0012] Furthermore, a grounding screw is installed at the bottom of the junction box seat, and a second nut, a second washer and a second O-ring are provided on the grounding screw.

[0013] Furthermore, a bow-shaped washer is provided at the corner of the outer surface of the convex structure at the bottom of the junction box body.

[0014] Furthermore, the contact surface between the junction box seat and the junction box cover, the outer surface of the bottom of the junction box seat, and the contact surface between the junction box seat and the wire passing device are all provided with explosion-proof surfaces.

[0015] Furthermore, the wire passing device is connected to the stator or bearing temperature measuring element through a wiring terminal.

[0016] Technicians in the technical field to which the present invention belongs often only consider the design of temperature measurement lead connection, motor wiring and installation of temperature measurement components when designing a temperature measurement junction box. For example, the invention with application publication number CN103390960A discloses an explosion-proof multifunctional junction box for three-phase asynchronous motors. The junction box structure is as follows: an inlet nozzle and an outlet nozzle are provided at the bottom of the junction box, and the stator temperature measurement lead, bearing temperature measurement lead and heater lead are respectively connected on the internal terminal board of the junction box seat. The stator temperature measurement lead, bearing temperature measurement lead and heater lead are introduced by a rubber sealing ring provided on the side of the junction box seat, and the junction box is sealed with epoxy resin glue. The invention is based on the structure of temperature measurement leads, motor leads and temperature measurement components, but the actual temperature measurement environment is complex, changeable and easily affected by the external environment. In response to external interference, the present invention adds a shielding wire at the bottom of the junction box, which can effectively avoid interference signals and ensure stable operation of the equipment.

[0017] In the prior art, wiring within a temperature measurement junction box is done in a winding-type manner, resulting in a complex wiring process. For example, patent application publication number CN111555561A discloses an explosion-proof motor temperature measurement junction box. This junction box features a single-piece exterior and two internal chambers. The winding heating zone occupies one chamber, while the stator winding temperature measurement device and bearing temperature measurement device share a single chamber, forming separate cavities. Wires exit from the winding heating zone, stator winding temperature measurement device, and bearing temperature measurement device in three directions: the winding heating zone and stator winding temperature measurement device enter internally, while the bearing temperature measurement device enters externally. This invention also suffers from the temperature measurement device being assembled and sealed within the junction box, making routine maintenance and replacement difficult. In contrast, the present invention places the stator temperature measurement element outside the junction box, and wiring is accomplished using plug-in terminals within the junction box. This simplifies wiring and significantly reduces installation workload. Therefore, based on the prior art, it is not easy for those skilled in the art to consider combining a wire feeder with plug-in terminals to facilitate installation, increase stability, and improve wiring efficiency and safety.

[0018] The beneficial effects of the present invention are as follows: an O-ring is used to seal between the junction box seat and the junction box cover, which greatly improves the protective performance of the temperature measuring junction box and the motor base during assembly. Adding up to four junction box buckets to the junction box can expand the number of cables received and tested; when some junction box buckets are idle, metal blocking rods can be used to block the idle junction box buckets, which meets the design requirements of explosion-proof electrical products. Compression nuts, sealing rings and metal washers are used at the junction box buckets to ensure that the external cables are crimped tightly by the junction box buckets to achieve the purpose of safe wiring. Positioning grooves are provided inside the junction box to facilitate the installation and fixation of the terminal board. Bolts are installed at the bottom of the temperature measuring junction box, and the temperature measuring junction box can be fixed to the motor base by the bolts to ensure that the junction box and the base are firmly installed; the protruding wire-passing device at the bottom of the temperature measuring junction box is partially snapped into the surface of the motor base, which can also effectively ensure the installation of the junction box. The wire guide mechanism features an oval plate, similar to a runway, that mates with the positioning grooves on the bottom of the junction box to prevent loosening. Eighteen 0.2mm² shielded wires are placed in the center, divided into six groups and threaded through the circular holes of the wire guide mechanism. This directs any interference signals to the ground, preventing them from entering the inner conductors and causing interference, while also reducing signal loss. The gap between the wires and the inner diameter of the wire guide mechanism is sealed with insulating material, meeting explosion-proof requirements. A grounding screw is installed at the bottom of the junction box to prevent leakage and ensure electrical safety. Plug-in terminals are installed within the junction box, replacing the traditional soldering or wire wrapping methods used to secure wires, making installation easier. Appropriate creepage distances are maintained between the upper end of the plug-in terminals and the upper surface of the junction box base, as well as between the lower end and the lower surface of the base. Reasonable electrical clearances are also maintained between the upper end of the plug-in terminals and the junction box cover, as well as between adjacent plug-in terminals, ensuring good electrical performance. The junction box is connected to the stator temperature measuring element through the wire-passing device using tin ring heat shrink terminal blocks, which facilitates stator replacement; the tin ring heat shrink terminal blocks shrink when heated, making it easy to insert the motor leads into the wire-passing device.

[0019] The present invention solves the technical problem that the stator is sealed in the junction box body in the past and is difficult to replace when the stator is damaged. The plug-in wiring is very convenient and is used for weak current explosion isolation and is easy to use. The equipment has excellent sealing performance, good wiring effect, simple structure, easy operation and stator replacement, and meets the requirements of simultaneous connection of multiple cables. It can ensure the safety and reliability of the operation of the YBX4 high-efficiency flameproof three-phase asynchronous motor temperature measurement junction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described in further detail below with reference to the accompanying drawings.

[0021] Figure 1 It is a main sectional view of the auxiliary temperature measurement junction box of the present invention.

[0022] Figure 2 It is a top view of the auxiliary temperature measurement junction box of the present invention.

[0023] Figure 3 It is a front view of the wiring board of the auxiliary temperature measurement junction box of the present invention.

[0024] Figure 4 It is a top view of the terminal board of the auxiliary temperature measurement terminal box of the present invention.

[0025] Figure 5 It is a front view of the wire-passing device of the auxiliary temperature measurement junction box of the present invention.

[0026] Figure 6 It is a top view of the wire-passing device of the auxiliary temperature measurement junction box of the present invention.

[0027] Figure 7 It is a structural diagram of the grounding screw of the auxiliary temperature measurement junction box of the present invention.

[0028] The meanings of the reference numerals are as follows:

[0029] 1: Third bolt, 2: Third gasket, 3: Compression nut, 4: Metal rod, 5: Sealing ring, 6: Metal washer, 7: Junction box seat, 8: First O-ring, 9: Junction box cover, 10: Terminal block, 101: Plug-in terminal, 102: Mounting plate, 11: Second bolt, 12: Flameproof wire passing device, 121: Shielded wire, 122: Round hole, 123: Oval plate, 124: First cylindrical structure, 125: Second cylindrical structure, 13: First nut, 14: first washer, 15: tin ring heat shrink terminal, 16: grounding screw, 17: second nut, 18: second washer, 19: bow washer, 20: second O-ring bow washer, 21: second gasket, 22: first bolt, 23: first gasket, 24: explosion-proof surface of the bottom outer surface of the junction box seat, 25: explosion-proof joint surface at the contact surface between the junction box seat and the junction box cover, 26: explosion-proof joint surface at the contact surface between the junction box seat and the wire-passing device. DETAILED DESCRIPTION

[0030] 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 1-7 , 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.

[0031] Example 1

[0032] like Figure 1-7The present embodiment provides a YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary temperature measurement junction box, comprising a junction box seat 7, a terminal block 10 disposed within the junction box seat 7, a wire-passing device 12 fixed to the bottom of the junction box seat 7, four junction box buckets provided on either side of the junction box seat 7, and a junction box cover 9 connected to the top of the junction box seat 7. The junction box seat 7 and the junction box cover 9 are hexagonal in structure. A terminal 15 is connected to the bottom of the wire-passing device 12, and the junction box bucket is provided with a compression nut 3, a metal plug 4, a sealing ring 5, and a metal washer 6 in sequence from the outside to the inside.

[0033] The junction box seat 7 and the junction box cover 9 are connected by a first O-ring 8. Four first bolts 22 are provided on the top of the junction box cover 9. First gaskets 23 are added to the first bolts 22. The junction box cover 9 is fixed to the junction box seat 7 by the first bolts 22. A positioning groove composed of two fixing plates is provided at the same horizontal plane inside the junction box seat 7. The junction plate 10 is fixed to the inside of the junction box body by snapping into the positioning groove.

[0034] The terminal block 10 includes a mounting plate 102 and plug-in terminals 101 fixed to the mounting plate 102 . Second bolts 11 are provided on both sides of the mounting plate 102 , and second washers 21 are installed on the second bolts 11 .

[0035] The wire passing device 12 is composed of an elliptical plate 123, a first cylindrical structure 124, a second cylindrical structure 125 and a first nut 13 fixed in sequence. The cross-sectional radius of the first cylindrical structure 124 is larger than the cross-sectional radius of the second cylindrical structure 125. The first cylindrical structure 124 is a hollow cylinder, and the second cylindrical structure 125 is a hollow stud. The first nut 13 is arranged on the outer surface of the second cylindrical structure 125, and a first washer 14 is provided on the first nut 13. Six circular holes 122 are opened on the elliptical plate 123, and the circular holes 122 pass through the wire passing device 12. The channel formed by the circular holes 122 is paved with insulating material.

[0036] The bottom of the junction box seat 7 is provided with third bolts 1 at both sides of the wire passing device 12 , and third washers 2 are installed on the third bolts 1 .

[0037] A grounding screw 16 is installed at the bottom of the junction box seat 7 , and a second nut 17 , a second washer 18 and a second O-ring 20 are provided on the grounding screw 16 .

[0038] An arched washer 19 is provided at the corner of the outer surface of the convex structure at the bottom of the junction box body.

[0039] The wire passing device 12 is connected to the stator or bearing temperature measuring element via the connection terminal 15 .

[0040] The compression nut 3 is made of HT250, the same material as the junction box cover 9 and junction box base 7. The metal plug 4 is made of Q235A. The sealing ring 5 is made of nitrile rubber, which has excellent sealing performance and elasticity, ensuring the connection between the junction box bucket and the junction box base 7. The metal washer 6, the second bolt 11, the third bolt 1, the first bolt 22, the first washer 23, and the grounding screw 16 are all made of zinc-plated and oxidized materials. The second gasket 21, the third gasket 2, and the second gasket 18 are made of oxidized 65Mn. The first O-ring 8 and the second O-ring 20 are both made of I-4 oil-resistant rubber, but their sizes are different. The first nut 13 is made of H62 galvanized material. The terminal 15 is an SST-S11 tin ring heat shrink terminal. The second nut 17 is made of H62 tin-plated material, the same material as the bow washer 19. After the cable is crimped to the junction box bucket, it is tightened using the compression nut 3. The invention provides an auxiliary temperature measurement junction box for a YBX4 high-efficiency flameproof three-phase asynchronous motor junction box.

[0041] The installation process of the temperature measurement junction box is as follows: the shielded wire 121 passes through the circular hole 122 of the wire-passing device 12 and is connected to the plug-in terminal 101 inside the junction box; the wire-passing device 12 is installed and fixed in the positioning groove at the bottom of the junction box; insulating filler is loaded into the inside of the junction box; sealant is poured into the inside of the junction box; the protruding structure at the bottom of the junction box is embedded and fixed to the motor base.

[0042] Example 2

[0043] like Figure 1-7 As described above, this embodiment provides a YBX4 high-efficiency flameproof three-phase asynchronous motor auxiliary temperature measurement junction box, which is an improvement on the basis of Example 1:

[0044] An explosion-proof surface 24 is provided on the outer surface of the bottom of the junction box seat 7, and an explosion-proof joint surface 25 at the contact surface between the junction box seat 7 and the junction box cover 9: L≥14, ic≤0.15; an explosion-proof joint surface 26 at the contact surface between the junction box seat 7 and the wire-passing device 12: L≥14, ic≤0.15.

[0045] The net volume of the temperature measurement junction box is: V≤2000cm³.

[0046] 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 flameproof three-phase asynchronous motor auxiliary temperature measurement junction box, comprising a junction box seat, a terminal block disposed within the junction box seat, a wire-passing device fixed to the bottom of the junction box seat, a junction box bucket disposed on the junction box seat, and a junction box cover connected to the upper portion of the junction box seat, wherein the junction box seat and the junction box cover are hexagonal structures; characterized in that: The bottom of the wire passing device is connected to the terminal, and the junction box bucket is provided with a clamping nut, a metal blocking rod, a sealing ring and a metal washer in sequence from the outside to the inside; The junction box seat and the junction box cover are connected via a first O-ring. Four first bolts are provided on the top of the junction box cover. First gaskets are added to the first bolts. The junction box cover is fixed to the junction box seat via the first bolts. A positioning groove composed of two fixing plates is provided on the same horizontal plane inside the junction box seat. The junction plate is fixed to the inside of the junction box seat via the positioning groove. The terminal block includes a mounting plate and a plug-in terminal fixed on the mounting plate, and second bolts are provided on both sides of the mounting plate, and second gaskets are installed on the second bolts; The wire-passing device is composed of an elliptical plate, a first cylindrical structure, a second cylindrical structure and a first nut fixed in sequence. The cross-sectional radius of the first cylindrical structure is larger than the cross-sectional radius of the second cylindrical structure. The first cylindrical structure is a hollow cylinder, and the second cylindrical structure is a hollow stud. The first nut is arranged on the outer surface of the second cylindrical structure, and a first washer is provided on the first nut. Six circular holes are opened on the elliptical plate, and the circular holes pass through the wire-passing device. The interior of the channel formed by the circular holes is paved with insulating material. The wire passing device is connected to the stator or bearing temperature measuring element through a wiring terminal.

2. A YBX4 flameproof three-phase asynchronous motor auxiliary temperature measurement junction box according to claim 1, characterized in that: A third bolt is provided at the bottom of the junction box seat, and a third gasket is installed on the third bolt.

3. A YBX4 flameproof three-phase asynchronous motor auxiliary temperature measurement junction box according to claim 2, characterized in that: A grounding screw is installed at the bottom of the junction box seat, and a second nut, a second washer and a second O-ring are provided on the grounding screw.

4. A YBX4 flameproof three-phase asynchronous motor auxiliary temperature measurement junction box according to claim 3, characterized in that: An arched washer is provided at the corner of the outer surface of the convex structure at the bottom of the junction box seat.

Images