CN201672953U

CN201672953U - Novel special terminal box for liquid-level pressure transmitter

Info

Publication number: CN201672953U
Application number: CN2010201823910U
Authority: CN
Inventors: 徐军; 赵宏科; 周华; 柳欢
Original assignee: MAIKE SENSOR CO Ltd
Current assignee: MAIKE SENSOR CO Ltd
Priority date: 2010-04-29
Filing date: 2010-04-29
Publication date: 2010-12-15
Anticipated expiration: 2020-04-29

Abstract

The utility model provides a novel special terminal box for a liquid-level pressure transmitter, which is provided with a box body, a box cover, a wiring terminal and an earth connector. The box cover matches with the box body, the wiring terminal is fixed in the box body, and the earth connector is located on the side wall of the box body. A groove is arranged on the lower end surface of the box cover, a projection matching with the groove is arranged on the upper end surface of the box body, a sealing ring I is disposed in the groove, the box cover and the box body are integrally connected by aid of screws through threaded holes I disposed at four corners of the box cover, a cable locking joint which is in seal connection with a cable is screwed into a threaded hole II arranged on one side of the box body through a sealing ring II cushioned under the cable locking joint, and an internal and external sealing ventilation structure is arranged on the wall of the box body below the threaded hole II. The novel special terminal box for a liquid-level pressure transmitter not only has a fine sealing protection function, but also has an internal and external ventilation balancing function, further has reliable structural strength and novel appearance, and resolves problems of wiring in measurement application of liquid-level pressure transmitters.

Description

Novel liquid level, pressure unit special junction box

Technical field

The utility model relates to the special junction box that a kind of novel liquid level, pressure transmitter measurement are used.

Background technology

Because liquid level, pressure transmitter measurement application characteristic (especially in the product of little range), terminal box not only will have the sealing protection function, also to have the inside and outside ventilation of housing equilibrium function, make transmitter not be subjected to extraneous temperature difference influence and measure accurately, terminal box also will have reliable structural strength and novel outward appearance, installs easily and use.Kind, the version of the terminal box of domestic industry occasion have varied having nothing in common with each other now, all belong to general simple wiring application form mostly.The sealing protection function of general common terminal box is poor, structural strength not enough, install and use inconvenience.Better terminal box can be accomplished the sealing protection of waterproof, but complex structure, heaviness, price height, installs and uses inconvenience, even if the terminal box that has can be accomplished very high sealing protection, but it does not have the function of inside and outside ventilation balance.

The utility model content

The technical matters that the utility model solves: a kind of novel liquid level, pressure unit special junction box are provided, sealing protection better function not only, and has the inside and outside ventilation of a box body equilibrium function, also have reliable structural strength and novel outward appearance, solved the wiring problem during liquid level, pressure transmitter measurement are used.

The technical solution adopted in the utility model: novel liquid level, pressure unit special junction box, have box body 6 and suitable with it lid 7, be fixed on the connection terminal 14 of box body 6 inside and be positioned at the earth connection point 8 of box body 6 sidewalls, described lid 7 lower surfaces are shaped on groove 16, described box body 6 upper surfaces are shaped on the boss 17 suitable with groove 16, be provided with O-ring seal I 13 in the groove 16, screw 12 connects as one lid 7 and box body 6 by the threaded hole I 18 that is arranged on 7 four jiaos of lids; Be tightly connected cable locking wire joint 4 by pad at 5 screw-ins of the O-ring seal II it under in the threaded hole II 19 of box body 6 one sides; On the box wall below the described threaded hole II 19, external seal ventilation device in being provided with.

The external seal ventilation device is by sealing adaptor 1 in described, O-ring seal III2, threaded hole III20, counterbore 21, through hole 22, waterproof ventilated membrane 3 and aperture 23 are formed, counterbore 21 is on box body 6 sidewalls, counterbore 21 front ends are made threaded hole III20, the rear end is a unthreaded hole 24, the bottom centre of unthreaded hole 24 is shaped on the through hole 22 with box body 6 internal run-throughs, the center of waterproof ventilated membrane 3 is the waterproof and breathable position, high-tenacity glue by the coating of its peripheral region is in the bottom surface of unthreaded hole 24, O-ring seal III2 is pressed on the waterproof ventilated membrane 3, sealing adaptor 1 screws in the threaded hole III20, sealing adaptor 1 inner center is shaped on the endoporus 25 isometrical with through hole 22, side in sealing adaptor 1 termination is shaped on the aperture 23 that connects with endoporus 25.

The locking wire scope of described locking wire joint 4 is the cable of diameter 5mm～10mm.

Described box body 6 bottoms are provided with the block tongue of fixing with steel wire 11 15, and the both sides of block tongue 15 respectively are shaped on a small boss 27, and steel wire 11 places below the block tongue 15 and its two ends are resisted against on small boss 27 inner end wall.

Described box body 6 bottoms are shaped on three mounting holes 26.

Groove 16 wide 2.7mm on the described lid 7, dark 4mm; Boss 17 wide 2mm on the suitable with it box body 6, high 2mm, boss 17 is corresponding with groove 16 centers.

The utility model compared with prior art not only can be used in general common application scenario, and can be applied in and need positiver sealing protection to need the special occasions of outer chamber ventilation balance in the box body simultaneously again, thereby can guarantee that product in use avoids the product instability that causes because of stuffiness, make pressure, fluid level transmitter reliably working.

Description of drawings

Fig. 1 is the utility model structure cut-open view;

Fig. 2 is the utility model structure upward view;

Fig. 3 removes vertical view behind the lid for the utility model;

Fig. 4 is the I portion enlarged drawing of Fig. 1.

Embodiment

Below in conjunction with accompanying

drawing

1,2,3,4 a kind of embodiment of the present utility model is described.

Novel liquid level, the pressure unit special junction box, have box body 6 and suitable with it lid 7, be fixed on the connection terminal 14 and the earth connection point 8 that is positioned at box body 6 sidewalls of box body 6 inside, screw I 10 is pressed on earth connection point 8 on box body 6 sidewalls by pad 9, earth connection point 8 is corrosion resistant 316 stainless steels, structure die casting by with groove is on box body 6 walls, can reach fixing, sealing effectiveness, lid 7 lower surfaces are shaped on groove 16, described box body 6 upper surfaces are shaped on the boss 17 suitable with groove 16, be provided with O-ring seal I 13 in the groove 16, groove 16 wide 2.7mm on the lid 7, dark 4mm; Boss 17 wide 2mm on the suitable with it box body 6, high 2mm, boss 17 is corresponding with groove 16 centers, screw 12 connects as one lid 7 and box body 6 by the threaded hole I 18 that is arranged on 7 four jiaos of lids, composite head screw 12 by 4 M4X20 is connected and fixed lid 7 and box body 6, this moment, O-ring seal I 13 was compressed in by the boss on the box body 6 17 in the groove 16 of lid 7, and the compression deformation by O-ring seal I 13 reaches sealing effectiveness, and O-ring seal I 13 can select for use

O type nitrile rubber O-ring seal; Be tightly connected cable locking wire joint 4 by pad at 5 screw-ins of the O-ring seal II it under in the threaded hole II 19 of box body 6 one sides, threaded hole II 19 is two, the locking wire scope of locking wire joint 4 is the cable of diameter 5mm～10mm.

On box wall middle below two threaded hole II 19, external seal ventilation device in being provided with, interior external seal ventilation device is by sealing adaptor 1, O-ring seal III2, threaded hole III20, counterbore 21, through hole 22, waterproof ventilated membrane 3 and aperture 23 are formed, counterbore 21 is on box body 6 sidewalls, counterbore 21 front ends are made threaded hole III20, the rear end is a unthreaded hole 24, the bottom centre of unthreaded hole 24 is shaped on the through hole 22 with box body 6 internal run-throughs, waterproof ventilated membrane 3 is a kind of dustproof, the ventilated membrane of waterproof, the center of waterproof ventilated membrane 3 is the waterproof and breathable position, high-tenacity glue by the coating of its peripheral region is in the bottom surface of unthreaded hole 24, waterproof ventilated membrane 3 centers

It on the area waterproof ventilative material, remainder scribbles the strong high-performance glue of bonding force, its waterproof ventilative material adopts expanded PTFE (PTFE) to make, microcellular structure, be chemical inertness, can be exposed to does not influence its performance in acid, the alkali, have hydrophobic and oil repellency simultaneously, can do not soaked, can keep gas penetration potential by most liquid; O-ring seal III2 is pressed on the waterproof ventilated membrane 3, and sealing adaptor 1 screws in the threaded hole III20, and sealing adaptor 1 inner center is shaped on the endoporus 25 isometrical with through hole 22, and the side in sealing adaptor 1 termination is shaped on the aperture 23 that connects with endoporus 25; Waterproof ventilated membrane 3 is sticked on

Then will in unthreaded hole 24 bottom surfaces at counterbore 21 rear portions of dark 12mm O RunddichtringO III2 be pressed on the waterproof ventilated membrane 3, sealing adaptor 1 is screwed among the threaded hole III20 of the dark 10mm of M10X1 on the box body 6, O RunddichtringO III2 plays the thread gaps effect that is tightly connected, and then passes through inside and outside the box body

Through hole 22,

Endoporus 25,

Aperture 23 and waterproof ventilated membrane 3 reach the ventilation equilibrium function.

Make the block tongue of fixing with steel wire 11 15 in box body 6 bottoms, the both sides of block tongue 15 respectively are shaped on a small boss 27, steel wire 11 places below the block tongue 15 and its two ends are resisted against on small boss 27 inner end wall, can easily terminal box be fixed on the 35mm standard DIN guide rail with pulling block tongue 15 in the groove of screwdriver insertion block tongue 15 rear ends, bottom design has three simultaneously

Mounting hole 26, the screw of available three M4X15 becomes triangle to be fixedly mounted on required occasion, screw is a stainless steel, head of screw is compound, can be suitable for crosshead, manifold screwdriver tool simultaneously, and is easy for operation.

The utility model material is selected terephthalate (PBT) engineering plastic for use, has characteristics such as non-conductive, the anti-pressure of insulation, waterproof, acid and alkali-resistance, shock-resistant, endurance, forming appearance surfaces are attractive in appearance, and inner 5 connection terminals that are provided with of terminal box can use in multiple industrial and mineral occasion.

Claims

1. novel liquid level, pressure unit special junction box, have box body (6) and suitable with it lid (7), be fixed on the inner connection terminal (14) of box body (6) and be positioned at the earth connection point (8) of box body (6) sidewall, it is characterized in that: described lid (7) lower surface is shaped on groove (16), described box body (6) upper surface is shaped on and the suitable boss (17) of groove (16), be provided with O-ring seal I (13) in the groove (16), screw (12) connects as one lid (7) and box body (6) by the threaded hole I (18) that is arranged on (7) four jiaos of lids; Be tightly connected cable locking wire joint (4) by pad at the O-ring seal II (5) it under screw-in in the threaded hole II (19) of box body (6) one sides; On the box wall of described threaded hole II (19) below, external seal ventilation device in being provided with.

2. novel liquid level according to claim 1, the pressure unit special junction box, it is characterized in that: the external seal ventilation device is by sealing adaptor (1) in described, O-ring seal III (2), threaded hole III (20), counterbore (21), through hole (22), waterproof ventilated membrane (3) and aperture (23) are formed, counterbore (21) is on box body (6) sidewall, counterbore (21) front end is made threaded hole III (20), the rear end is unthreaded hole (24), the bottom centre of unthreaded hole (24) is shaped on the through hole (22) with box body (6) internal run-through, the center of waterproof ventilated membrane (3) is the waterproof and breathable position, high-tenacity glue by the coating of its peripheral region is in the bottom surface of unthreaded hole (24), O-ring seal III (2) is pressed on the waterproof ventilated membrane (3), sealing adaptor (1) screws in the threaded hole III (20), the inner center of sealing adaptor (1) is shaped on and the isometrical endoporus (25) of through hole (22), side in sealing adaptor (1) termination is shaped on the aperture (23) that connects with endoporus (25).

3. novel liquid level according to claim 1 and 2, pressure unit special junction box is characterized in that: the locking wire scope of described locking wire joint (4) is the cable of diameter 5mm～10mm.

4. novel liquid level according to claim 1 and 2, pressure unit special junction box, it is characterized in that: described box body (6) bottom is provided with the fixing block tongue (15) of steel wire (11), the both sides of block tongue (15) respectively are shaped on a small boss (27), and steel wire (11) places below the block tongue (15) and its two ends are resisted against on small boss (27) inner end wall.

5. novel liquid level according to claim 1 and 2, pressure unit special junction box is characterized in that: described box body (6) bottom is shaped on three mounting holes (26).

6. novel liquid level according to claim 1 and 2, pressure unit special junction box is characterized in that: the wide 2.7mm of groove (16) on the described lid (7), dark 4mm; The wide 2mm of boss (17) on the suitable with it box body (6), high 2mm, boss (17) is corresponding with groove (16) center.