CN213090882U - Explosion-proof liquid level transmitter used in explosive environment - Google Patents
Explosion-proof liquid level transmitter used in explosive environment Download PDFInfo
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- CN213090882U CN213090882U CN202022471628.3U CN202022471628U CN213090882U CN 213090882 U CN213090882 U CN 213090882U CN 202022471628 U CN202022471628 U CN 202022471628U CN 213090882 U CN213090882 U CN 213090882U
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Abstract
The utility model discloses a flame-proof liquid level transmitter based on use in explosive environment, which comprises an adapter, a sensor, an adapter welding sheet, a liquid level shell cylinder, a PVC pipe, a conduit, a PCB, a flame-retardant sheet connecting joint, a flame-retardant sheet, a transmitter rear end connector and an air duct, wherein the adapter is connected with the flame-retardant sheet connecting joint through the liquid level shell cylinder, the adapter is connected with the adapter welding sheet, the sensor is arranged in a cavity formed by the adapter welding sheet and the flame-retardant sheet, the PVC pipe, the flame-retardant sheet and the flame-retardant sheet connecting joint are sequentially arranged in the liquid level shell cylinder along the rear end direction of the adapter welding sheet, the PCB and the conduit are arranged in the PVC pipe, the PCB is electrically connected with the sensor, the flame-retardant sheet is connected with the flame-retardant sheet connecting joint, the flame-retardant sheet connecting joint is connected with the transmitter rear end connector, the air, the utility model provides a low and unable problem of keeping apart explosion flame of liquid level transmitter measurement accuracy among the prior art.
Description
Technical Field
The utility model relates to a liquid level transmitter especially relates to a flame proof liquid level transmitter based on use in the explosive environment.
Background
When the existing liquid level transmitter is used, the existing liquid level transmitter needs to be placed into a medium to be measured, the pressure of the measuring medium is influenced by the change of the external atmospheric pressure in the using process, and the external atmospheric pressure is changed along with the influence of the altitude, the longitude and latitude and the weather, so that the pressure on the surface of the measured measuring medium is different, and the measuring precision of the liquid level transmitter during continuous measurement is low. When the liquid level transmitter is applied to explosion-proof environments such as a comprehensive pipe gallery, a sewage treatment plant, a mine, an oil pool and an oil tank, the standard requirements of explosive environments GB3836.1 and GB3836.2 need to be met. Due to various reasons, electronic parts of elements of the explosion-proof liquid level transmitter can explode inside, and the explosion flame is protected inside the shell through structural design, so that the safety of the explosion external environment is ensured. Therefore, a liquid level transmitter capable of realizing high measurement precision and ensuring the safety of the external environment when the inside of the transmitter explodes is needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a flame proof liquid level transmitter based on use in the explosive environment solves the problem that liquid level transmitter measurement accuracy is low and can't keep apart explosion flame among the prior art, and its technical scheme is as follows:
an explosion-proof liquid level transmitter used in an explosive environment comprises an adapter, a sensor, an adapter welding sheet, a liquid level shell cylinder, a PVC pipe, a guide pipe, a PCB, a flame-retardant sheet connecting joint, a flame-retardant sheet, a transmitter rear end joint and a gas guide pipe, the adapter is connected with the flame-retardant sheet connecting joint through the liquid level shell barrel, the adapter is connected with the adapter welding sheet, a sensor is arranged in a cavity enclosed by the adapter welding sheet and the adapter welding sheet, a PVC pipe, a flame-retardant sheet and a flame-retardant sheet connecting joint are sequentially arranged in the liquid level shell barrel along the rear end direction of the adapter welding sheet, the interior of the PVC pipe is provided with a PCB board and a conduit, the PCB board is electrically connected with the sensor, the flame-retardant sheet is connected with the flame-retardant sheet connecting joint, the flame-retardant sheet connecting joint is connected with the rear end connector of the transmitter, and an air duct is arranged in a middle cavity of the rear end connector of the transmitter.
Preferably, the front end of adapter still is provided with the protective cap, the front end and the middle part of protective cap are provided with the through-hole.
Preferably, the adapter is in threaded connection with the liquid level shell barrel, and an O-shaped ring is arranged at the contact part of the adapter and the liquid level shell barrel.
Preferably, the PCB board passes through the fix with screw PVC pipe, just the screw passes the PCB board reaches the PVC pipe is fixed in adapter welding piece.
Preferably, the PCB board is connected with the air guide cable.
Preferably, the air guide cable includes top layer, shielded wire, signal transmission line and air duct, the outside of shielded wire is the top layer, and inside parcel has signal transmission line and air duct.
Preferably, the front end of the flame-retardant sheet is provided with a flame-retardant sheet locking joint for compressing the flame-retardant sheet, and the flame-retardant sheet locking joint is fixedly connected with the flame-retardant sheet connecting joint.
Preferably, the flame-retardant sheet connection joint is further provided with a grounding mounting screw.
Preferably, the outside of the transmitter rear end connector is also provided with a rubber sheath.
Preferably, the inside of changer rear end joint still is provided with rubber bolt, changer lockwire pad, changer lockwire pressure hoop fixed mounting is in inside the changer rear end joint, the rubber bolt with changer lockwire pad, changer lockwire pressure hoop are inside through having the air guide cable, the air guide cable is twisted round through changer lockwire pressure hoop and is twisted round to twist messenger rubber bolt and changer lockwire pad extrusion deformation locking fixed.
Compared with the prior art, the beneficial effects of the utility model are that:
1. through the arrangement of the sensor, the conduit and the air duct, the external atmospheric pressure is ensured to be communicated with the interior of the liquid level transmitter, when the sensor measures the pressure from a measuring medium, the influence of the pressure of the atmospheric pressure on two sides of the sensing diaphragm of the sensor is automatically eliminated, and the measurement precision of the liquid level transmitter is improved.
2. Through the setting of fire-retardant piece, fire-retardant piece attach fitting, liquid level shell barrel, the flame that produces when the explosion inside the liquid level transmitter keeps apart inside to ensure the safety of the environment of hiring outside the liquid level transmitter.
3. The utility model discloses a stainless steel screw draws the ground wire of PCB board design to the liquid level shell barrel of stainless steel on, stainless steel liquid level shell barrel communicates with each other through measuring medium and equipment earth, the big energy that produces when guaranteeing the inside explosion of liquid level ware passes through the effectual release of ground wire, draw forth the ground wire in the air guide cable through ground connection mounting screw simultaneously, realize communicating with each other of liquid level changer and earth, the big energy that produces when can guaranteeing the inside explosion of liquid level ware passes through the effectual release of ground wire.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view taken at A of FIG. 1;
in the figure: 1. a protective cap, 2, a joint; 3. a sensor; 4. an O-shaped ring; 5. a connector welding sheet; 6. a screw; 7. a PCB board; 8. a liquid level housing barrel; 9. PVC pipes; 10. a surface layer; 11. a flame retardant sheet locking joint; 12. an air duct; 13. a flame retardant sheet; 14. a flame retardant sheet connection joint; 15. a signal transmission line; 16. a shielded wire; 17. the rear end connector of the transmitter; 18. a ground mounting screw; 19. a rubber plug; 20. a transmitter lockwire pad; 21. locking and pressing a wire of the transmitter; 22. a rubber sheath; 23. an air guide cable.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
The flameproof liquid level transmitter based on the explosive environment shown in fig. 1 comprises a protective cap 1, an adapter 2, a sensor 3, an adapter welding sheet 5, a liquid level shell cylinder 8, a PCB 7, a flame-retardant sheet locking joint 11, a flame-retardant sheet 13, a flame-retardant sheet connecting joint 14, a transmitter rear end joint 17 and an air duct 12.
The protective cap 1, the adapter 2, the adapter welding sheet 5, the liquid level shell cylinder 8 and the flame-retardant sheet locking joint 11 are all made of stainless steel.
The front end and the middle part of the protective cap 1 are provided with through holes, the whole protective cap is cylindrical, the middle of the protective cap is hollow, and the inner surface of the protective cap is provided with internal threads.
Protective cap 1 connects level housing barrel 8 and adapter welding piece 5 respectively through adapter 2, the front end of protective cap 1 is provided with 3-8 apertures on the circumference wall, the aperture of aperture is 3mm, prevents that the large granule in the measuring medium from getting into, and then prevents measuring medium pollution sensor 3.
The whole shape of adapter 2 is the cylinder type, and front end and rear end surface all are provided with the screw thread, protective cap 1 with adapter 2's front end threaded connection, adapter 2's rear end threaded connection level shell barrel 8, level shell barrel 8 is whole to be the cylinder, and middle part cavity, and the two contact site is provided with O type circle 4, simultaneously adapter 2 outside middle part with level shell barrel 8's contact site adopts laser welding fixed.
Adapter 2 with adapter welded piece 5 is coaxial, and the two contact site passes through laser welding fixed, and the inside sensor 3 that is provided with of cavity that forms between the two, sensor 3 is glued through annular resin on adapter welded piece 5, and annular resin glues and glue in adapter welded piece 5's sticky length is not less than 6.5mm, further realizes that the front and back end of sensor 3 keeps apart sealed completely.
The sensor 3 is a piezoresistive sensor, a capacitive sensor or a ceramic sensor, and in this embodiment, the sensor 3 is a piezoresistive sensor.
Adapter welding piece 5 is located inside liquid level shell barrel 8, and whole be cylindrical, the front end of adapter welding piece 5 extends to the outside and is provided with the boss, adapter welding piece 5 with the welding position of adapter 2 is located the boss department of adapter welding piece 5.
The rear end of adapter welding piece 5 is provided with PVC pipe 9, the rear end opening of PVC pipe 9, and the front end is provided with the arch that extends forward, fixes through the protruding joint that extends the rear end of adapter welding piece 5. PVC pipe 9's inside is provided with PCB board 7 of T shape to connect through signal transmission line 15 sensor 3, PCB board 7 passes through screw 6 to be fixed PVC pipe 9, just screw 6 passes PCB board 7 reaches PVC pipe 9 is fixed to adapter welding piece 5, screw 6 is provided with two, and adopts stainless steel, PCB board 7's rear end is connected with signal transmission line 15, PVC pipe 9 is inside to adopt the epoxy watering sealed.
Still be provided with the pipe among the epoxy of the inside watering of PVC pipe 9, the front end export of pipe is located sensor 3 with the cavity that adapter welding piece 5 enclosed, the rear end export of pipe stretches out PVC pipe 9, and the benefit of adopting this kind of design is, ensures that the atmospheric pressure of sensor 3 rear end communicates with each other with external atmospheric pressure.
Meanwhile, the ground wire designed by the PCB 7 is led to the stainless steel liquid level shell cylinder 8 through the screw 6, the stainless steel liquid level shell cylinder 8 is communicated with the ground through a measuring medium, and the design can ensure that the large energy generated during the explosion inside the liquid level shifter is effectively released through the ground wire.
Along the rear end direction of PVC pipe 9 is in liquid level shell barrel 8 is inside to be provided with in proper order and to be used for compressing tightly fire-retardant piece locking joint 11, fire-retardant piece 13, fire-retardant piece attach fitting 14, changer rear end joint 17 of fire-retardant piece 13.
Level shell barrel 8 passes through fire-retardant piece attach fitting 14 fixed connection changer rear end connector 17, just fire-retardant piece attach fitting 14 with level shell barrel 8 with the position that changer rear end connector 17 contacted all is provided with the sealing washer.
The whole cylindrical that is of fire-retardant piece attach fitting 14, and the middle part leads to spaciously, the central point of fire-retardant piece attach fitting 14's front end is provided with an inner groovy, the rear end bottom of inner groovy is provided with fire-retardant piece 13, and epoxy gluing is passed through at the two contact site, and glues length and be not less than 5mm, and the surface of inner groovy is provided with the screw thread, fire-retardant piece lock joint 11 is installed through the screw thread to the inner groovy.
It should be noted that the fire-retardant piece adopts the metallurgical powder sintering of stainless steel to form, and its inside aperture is at 40-50um, and the biggest space is 0.1mm, installs in the inside of level shell barrel 8 through epoxy glue and fire-retardant piece lock joint 11, simultaneously the rear end export of pipe is located the cavity that fire-retardant piece lock joint 11 and fire-retardant piece 13 enclose, adopts the benefit of this kind of design to be because the molecule size structure of atmosphere and flame is different, and the flame that the instantaneous explosion produced can be kept apart to fire-retardant piece, can also introduce the atmospheric pressure that comes from the outside simultaneously.
The middle part surface of fire-retardant piece attach fitting 14 is provided with the screw thread, and is close to the position of screw thread and is provided with the protruding of outside extension, fixes through the protruding laser welding respectively of extending level shell barrel 8 with changer rear end joint 17, simultaneously fire-retardant piece attach fitting 14 the outside with level shell barrel 8 threaded connection is fixed.
A through hole is formed in one side of the cylinder wall of the flame-retardant sheet connecting joint 14, the through hole is used for the signal transmission line 15 to pass through, and the part, which is in contact with the outside of the signal transmission line 15, in the through hole is glued through epoxy resin.
Furthermore, a grounding installation screw 18 is arranged on the surface of the rear end of the flame-retardant sheet connecting joint 14, a ground wire in an air guide cable 23 is led out through the grounding installation screw 18, the communication between the liquid level transmitter and the ground is realized, and the large energy generated when the inside of the liquid level shifter explodes can be effectively released through the ground wire.
The whole of changer rear end joint 17 is cylindrical, and inside is located the middle part and is provided with an annular boss, and the middle part of annular boss is provided with the opening that is used for signal transmission line 15 to pass through.
The rear end surface of changer rear end joint 17 wraps up there is rubber sheath 22, the rear end of rubber sheath 22 is the infundibulate, inside rubber bolt 19, changer lockstitch pad 20 and the pressure hoop 21 of changer lockstitch that has set gradually of rear end of changer rear end joint 17, rubber bolt 19 with changer lockstitch pad 20, the inside air guide cable 23 that has passed through of changer lockstitch pad 21, air guide cable 23 revolves soon through changer lockstitch pressure hoop 21 and revolves to twist two rubber bolts 19 and the 20 extrusion deformation locking of a changer lockstitch pad and fix, changer lockstitch pressure hoop 21 is fixed the inside of changer rear end joint 17.
The airway cable 23 shown in fig. 2 comprises a surface layer 10, a shielding wire 16, a signal transmission line 15 and an airway tube 12, wherein the surface layer 10 is made of insulating grease.
The outer part of the shielding wire 16 is a surface layer 10, the inner part is wrapped by a signal transmission line 15 and an air duct 12, the signal transmission line 15 is electrically connected with the PCB 7, one end of the surface layer 10 of the air duct cable 23 and one end of the air duct 12 are positioned at an opening of the middle part of the rear end connector 17 of the transmitter, the other end of the air duct 12 is communicated with the external atmosphere, and the diameter of the air duct 12 is 1.8mm, so that the advantage is that the external atmosphere can be introduced into the transmitter through the arrangement of the air duct 12, the atmospheric pressure at the front end and the rear end of the sensor 3 is the same through the gauge pressure measurement of the sensor 3, further, the front end of the sensor 3 is used for measuring the pressure from the measuring medium, and the pressure of the measuring medium is the sum of the pressure and the atmospheric pressure received by the depth position of the measuring medium, and by the design, the influence of the atmospheric pressure acting, ensure that the liquid level transmitter is more accurate when measuring the liquid level height.
The shielding wire 16 is connected with the grounding installation screw 18, and the grounding wire in the air guide cable 23 is led out through the arrangement of the shielding wire 16 and is communicated with the ground through the grounding installation screw 18, the liquid level shell cylinder 8 and the rear end connector 17 of the transmitter, so that the large energy generated when the liquid level shifter explodes can be effectively released through the grounding wire.
When the device works, the liquid level transmitter is placed in a measuring medium to be measured, the pressure generated at the depth position of the measuring medium is measured through the sensor 3, the other end of the sensor 3 is communicated with the outside through a guide pipe and an air guide pipe and used for measuring the external atmospheric pressure, and the liquid level depth of the measuring medium to be measured is obtained through the pressure difference at the two ends of the sensor 3.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a flame proof liquid level changer based on use in explosive environment which characterized in that: including adapter, sensor, adapter welding piece, liquid level shell barrel, PVC pipe, PCB board, fire-retardant piece attach fitting, fire-retardant piece, changer rear end connector, air duct, the adapter passes through liquid level shell barrel and connects fire-retardant piece attach fitting, the adapter is connected adapter welding piece, the sensor is installed to the cavity that the two encloses, along the rear end direction of adapter welding piece is in liquid level shell barrel inside has set gradually PVC pipe, fire-retardant piece and fire-retardant piece attach fitting, PVC intraduct is provided with PCB board and pipe, PCB board electric connection the sensor, fire-retardant piece is connected fire-retardant piece attach fitting, fire-retardant piece attach fitting connects changer rear end connector, be provided with the air duct in the middle cavity of changer rear end connector.
2. The flameproof liquid level transmitter used in the explosive-based environment according to claim 1, characterized in that: the front end of adapter still is provided with the protective cap, the front end and the middle part of protective cap are provided with the through-hole.
3. The flameproof liquid level transmitter used in the explosive-based environment according to claim 1, characterized in that: the adapter is in threaded connection with the liquid level shell barrel, and an O-shaped ring is arranged at the contact position of the adapter and the liquid level shell barrel.
4. The flameproof liquid level transmitter used in the explosive-based environment according to claim 1, characterized in that: the PCB board passes through the fix with screw PVC pipe, just the screw passes the PCB board reaches the PVC pipe is fixed in adapter welding piece.
5. The flameproof liquid level transmitter used in the explosive-based environment according to claim 1, characterized in that: the PCB is connected with the air guide cable.
6. The flameproof liquid level transmitter used in the explosive-based environment according to claim 5, characterized in that: the air guide cable comprises a surface layer, a shielding wire, a signal transmission line and an air guide tube, wherein the surface layer is arranged outside the shielding wire, and the signal transmission line and the air guide tube are wrapped inside the shielding wire.
7. The flameproof liquid level transmitter used in the explosive-based environment according to claim 1, characterized in that: the front end of the flame-retardant sheet is provided with a flame-retardant sheet locking joint for compressing the flame-retardant sheet, and the flame-retardant sheet locking joint is fixedly connected with the flame-retardant sheet connecting joint.
8. The flameproof liquid level transmitter used in the explosive-based environment according to claim 1, characterized in that: the flame-retardant sheet connecting joint is also provided with a grounding mounting screw.
9. The flameproof liquid level transmitter used in the explosive-based environment according to claim 1, characterized in that: and a rubber sheath is arranged outside the rear end connector of the transmitter.
10. The flameproof liquid level transmitter used in the explosive-based environment according to claim 5, characterized in that: the inside of changer rear end joint still is provided with rubber bolt, changer lockwire pad, changer lockwire pressure hoop fixed mounting is in inside the changer rear end joint, the rubber bolt with changer lockwire pad, the inside air guide cable that has passed through of changer lockwire pressure hoop, the air guide cable is twisted soon through changer lockwire pressure hoop and is twisted messenger rubber bolt and changer lockwire pad extrusion deformation locking fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022471628.3U CN213090882U (en) | 2020-10-30 | 2020-10-30 | Explosion-proof liquid level transmitter used in explosive environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022471628.3U CN213090882U (en) | 2020-10-30 | 2020-10-30 | Explosion-proof liquid level transmitter used in explosive environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213090882U true CN213090882U (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022471628.3U Active CN213090882U (en) | 2020-10-30 | 2020-10-30 | Explosion-proof liquid level transmitter used in explosive environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213090882U (en) |
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2020
- 2020-10-30 CN CN202022471628.3U patent/CN213090882U/en active Active
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