Explosion-proof flow transmitter

Abstract

The utility model belongs to the technical field of explosion-proof instruments, and particularly relates to an explosion-proof flow transmitter which is characterized by comprising a mainframe box, an explosion-proof connecting piece and a junction box, and the mainframe box is connected with the junction box through the explosion-proof connecting piece; the explosion-proof connecting piece comprises a pipe body and flanges at the two ends of the pipe body, first potting glue is arranged in the pipe body, and the data line penetrates through the first potting glue; the host box and the junction box are respectively provided with an external grounding part and a plurality of explosion-proof cable joints; a display screen assembly and a first wiring terminal are arranged in the mainframe box, and a second wiring terminal is arranged in the junction box; the mainframe box is provided with a window, and internal grounding parts are arranged in the mainframe box and the junction box respectively. The beneficial effects of the utility model are that the transmitter host and the junction box are connected through the explosion-proof connecting piece, the data line passes through the explosion-proof connecting piece and is filled with glue to meet the explosion-proof requirement, and the explosion-proof performance meets the requirement of the IP66 protection grade.

Description

Technical Field

[0001] This utility model belongs to the field of explosion-proof instrument technology, and in particular relates to an explosion-proof flow transmitter. Background Technology

[0002] Explosion-proof refers to the ability to withstand the impact and heat of an explosion without loss and to continue functioning normally. Preventing an explosion requires considering three essential conditions: ignition point, oxidizing gas, and combustible material. Limiting any one of these conditions limits the occurrence of an explosion. Instruments and electrical equipment are required to have corresponding explosion-proof structures. Explosion-proof instruments are electric instruments that can be safely used in environments containing explosive mixtures. These instruments are designed and manufactured with specific safety measures in place to ensure safe power supply, use, detection, and control in hazardous locations such as petroleum and chemical plants.

[0003] A flow transmitter, also known as a flow sensor or simply a flow meter, is a new generation of high-precision, high-reliability precision metering instrument developed according to ISO 9951 standards and incorporating advanced domestic and international flow meter technologies. It integrates temperature, pressure, and flow sensors with an intelligent flow totalizer. Flow transmitters are often used in conjunction with flow sensors to measure flow rate and are frequently used in applications requiring explosion-proof features; therefore, their enclosures must have a high explosion-proof rating.

[0004] Chinese utility model patent application number 202220191299.3 discloses an ultrasonic flow meter, including a mounting base and an explosion-proof box. The mounting base has a mounting groove on its top, within which a bearing is fixedly connected. A support column is fixedly inserted into the bearing, and the top of the support column is fixedly connected to the explosion-proof box. The flow meter body is located inside the explosion-proof box. Positioning plates are provided on both sides of the explosion-proof box. Two connecting rods are fixedly connected to one side of each positioning plate. One end of each connecting rod penetrates the explosion-proof box and extends inward. A pressing block is fixedly connected to the extended end of the connecting rod, and the pressing block abuts against the flow meter body. The positioning plate has a threaded opening with a threaded rod inserted into its thread. This ultrasonic flow meter is easy to install, allows for flexible adjustment of the flow meter's display direction, prevents the flow meter from being obstructed by other objects, and makes reading more convenient. However, this flow meter housing structure does not meet the IP66 protection rating required by this application. Utility Model Content

[0005] The purpose of this utility model is to provide an explosion-proof flow transmitter that overcomes the shortcomings of the prior art. By connecting the transmitter host and the junction box through an explosion-proof connector, and passing the data cable through the explosion-proof connector and internally potting it with glue, the explosion-proof requirements are met. Its explosion-proof performance needs to meet the IP66 protection level requirements.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] An explosion-proof flow transmitter is characterized by comprising a main unit, an explosion-proof connector, and a junction box, wherein the main unit is connected to the junction box via the explosion-proof connector; the explosion-proof connector includes a pipe body and flanges at both ends of the pipe body, and a potting compound is provided inside the pipe body, through which a data cable passes; the main unit and the junction box are respectively provided with an external grounding and several explosion-proof glands; the main unit is provided with a display screen assembly and a first terminal block, and the junction box is provided with a second terminal block; a viewing window is provided on the main unit, and internal grounding is provided in both the main unit and the junction box.

[0008] Furthermore, the main unit chassis includes a main unit top cover, a main unit bottom cover, and a main housing. One end of the main housing is connected to the main unit top cover via an explosion-proof thread and a sealing ring, and the other end of the main housing is connected to the main unit bottom cover via an explosion-proof thread and a sealing ring.

[0009] Furthermore, the junction box includes a junction box housing and a junction box cover, with an opening at the top of the junction box housing, and the junction box cover and the junction box housing are connected by explosion-proof threads and sealing rings.

[0010] Furthermore, the display screen assembly is provided with tempered glass, and a second potting compound is provided between the tempered glass and the main unit cover. The bonding surface length of the second potting compound is greater than 10mm, and the second potting compound is K-9741 glue.

[0011] Furthermore, the joint surface length of the first potting compound is greater than 20mm, the first potting compound is K-9741 adhesive, and a sealing gasket is provided at one end of the tube.

[0012] Furthermore, the viewing window is circular with a 30-45° chamfer on the outer edge; the explosion-proof gland is connected to the corresponding enclosure via an explosion-proof thread.

[0013] Furthermore, the explosion-proof thread has a minimum number of engaged threads greater than 5 and an axial engagement length greater than 8 mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1) By connecting the transmitter host and the junction box through an explosion-proof connector, the data cable passes through the explosion-proof connector and is internally potted with glue to meet the explosion-proof requirements, and its explosion-proof performance meets the requirements of IP66 protection level.

[0016] 2) The structure is easy to assemble and has good sealing performance. The transmitter main unit and junction box are connected to the outside world through explosion-proof glands, which fully meet the performance requirements of dustproof and waterproof. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of an embodiment of this utility model;

[0018] Figure 2 yes Figure 1 Sectional view along line AA;

[0019] Figure 3 yes Figure 1 The left view;

[0020] Figure 4 yes Figure 2 Enlarged view of section I in the image;

[0021] Figure 5 yes Figure 2 Enlarged view of section II in the image;

[0022] Figure 6 yes Figure 2 Enlarged view of section III in the image;

[0023] Figure 7 This is a schematic diagram of the explosion-proof gland connection structure in an embodiment of this utility model;

[0024] In the diagram: 1-Main unit chassis, 2-Explosion-proof connector, 3-Junction box, 4-Pipe body, 5-Flange, 6-Filling glue one, 7-Data cable, 8-External grounding, 9-Explosion-proof gland, 10-Display unit assembly, 11-First terminal block, 12-Second terminal block, 13-Window, 14-Internal grounding, 15-Main unit top cover, 16-Main unit bottom cover, 17-Main unit chassis, 18-Explosion-proof thread, 19-Sealing ring, 20-Junction box, 21-Junction box top cover, 22-Tempered glass, 23-Product nameplate, 24-Filling glue two, 25-Sealing gasket. Detailed Implementation

[0025] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0027] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0028] See Figure 1-7 This is a schematic diagram of the structure of a reversible vertical roll mill for strip roughing according to the present invention. It includes a main unit housing 1, an explosion-proof connector 2, and a junction box 3. The main unit housing 1 is connected to the junction box 3 via the explosion-proof connector 2. The explosion-proof connector 2 includes a tube body 4 and flanges 5 at both ends of the tube body 4. A potting compound 6 is installed inside the tube body 4. The length of the tube body 4 is greater than 20mm. A data cable 7 passes through the potting compound 6. The mating surface length of the potting compound 6 is greater than 20mm. The potting compound 6 is K-9741 adhesive. A sealing gasket 25 is provided at one end of the tube body 4. An external grounding 8 and several explosion-proof glands 9 are respectively provided on the main unit housing 1 and the junction box 3. The explosion-proof glands 9 are connected to the corresponding housing via explosion-proof threads 18.

[0029] The main unit 1 is equipped with a display screen assembly 10 and a first terminal block 11, and the junction box 3 is equipped with a second terminal block 12. The main unit 1 has a viewing window 13, and the main unit 1 and the junction box 3 are respectively equipped with an internal grounding 14. The viewing window 13 is circular, and the outer edge is chamfered at 30-45°.

[0030] The main unit chassis 1 includes a top cover 15, a bottom cover 16, and a main body 17. One end of the main body 17 is connected to the top cover 15 via an explosion-proof thread 18 and a sealing ring 19, and the other end is connected to the bottom cover 16 via the same thread 18 and sealing ring 19. The display screen assembly 10 has tempered glass 22, and a second potting compound 24 is installed between the tempered glass 22 and the top cover 15. The mating surface length of the second potting compound 24 is greater than 10mm, and the second potting compound 24 is K-9741 adhesive. The main unit chassis volume is 2L. A warning sign stating "Do not open in dangerous areas" is prominently displayed on the outer casing. The explosion-proof surfaces must be free from impacts, scratches, or other mechanical damage. During assembly, the mating surfaces and threads should be coated with 204-1 anti-rust oil. All fasteners should be tightened and have anti-loosening measures.

[0031] Junction box 3 includes a junction box housing 20 and a junction box cover 21. The junction box housing 20 has an opening at the top, and the junction box cover 21 and the junction box housing 20 are connected by an explosion-proof thread 18 and a sealing ring 19. The explosion-proof thread 18 has a minimum number of engagement threads greater than 5 and an axial engagement length greater than 8 mm. The sealing ring 19 is an O-ring.

[0032] The main body 17 has a product nameplate 23 on its outer side, which is marked with:

[0033] 1. Product Name: Explosion-proof Flow Transmitter;

[0034] 2. Product Model: MT1600-ab-cd(ESS);

[0035] 3. Input voltage: DC: 9~36V / AC: 110~250V;

[0036] 4. Explosion-proof marking: Ex db IIC T6 Gb, Ex tb IIIC T80℃Db;

[0037] 5. Ambient temperature: -50℃~+60℃;

[0038] 6. Protection rating: IP66;

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof flow transmitter, comprising: The application relates to a main box, an explosion-proof connecting piece and a junction box, wherein the main box is connected with the junction box through the explosion-proof connecting piece; the explosion-proof connecting piece comprises a pipe body and flanges at two ends of the pipe body, a first glue filling part is arranged in the pipe body, and a data line passes through the first glue filling part; an external grounding and a plurality of explosion-proof gland nuts are arranged on the main box and the junction box respectively; a display screen assembly and a first wiring terminal are arranged in the main box, and a second wiring terminal is arranged in the junction box; a window is arranged on the main box, and an internal grounding is arranged in the main box and the junction box.

2. The explosion-proof flow transmitter of claim 1, wherein, The main box comprises a main box upper cover, a main box lower cover and a main box body, one end of the main box body is connected with the main box upper cover through an explosion-proof thread and a sealing ring, and the other end of the main box body is connected with the main box lower cover through an explosion-proof thread and a sealing ring.

3. The explosion-proof flow transmitter of claim 1, wherein, The junction box comprises a junction box box and a junction box upper cover, the top of the junction box box is open, and the junction box upper cover and the junction box box are connected through an explosion-proof thread and a sealing ring.

4. The explosion-proof flow transmitter of claim 1, wherein, A tempered glass is arranged on the display screen assembly, a second glue filling part is arranged between the tempered glass and the main box upper cover, the length of a joint surface of the second glue filling part is greater than 10 mm, and the second glue filling part is K-9741 glue.

5. The explosion-proof flow transmitter of claim 1, wherein, The length of a joint surface of the first glue filling part is greater than 20 mm, the first glue filling part is K-9741 glue, and one end of the pipe body is provided with a sealing gasket.

6. The explosion-proof flow transmitter of claim 1, wherein, The window is circular, and a 30-45 DEG chamfer is arranged on the outer side edge; the explosion-proof gland nut is connected with the corresponding box through an explosion-proof thread.

7. An explosion-proof flow transmitter according to any one of claims 2, 3, 6, wherein, The minimum engagement number of the explosion-proof thread is greater than 5, and the axial engagement length is greater than 8 mm.

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