CN210375478U

CN210375478U - Flat membrane type pressure transmitter

Info

Publication number: CN210375478U
Application number: CN201921817548.XU
Authority: CN
Inventors: 黎卓韬; 陈玉柱
Original assignee: Guangzhou Parsen Industrial Technology Co ltd
Current assignee: Guangdong paisheng Industrial Technology Co.,Ltd.
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-04-21
Anticipated expiration: 2029-10-25

Abstract

The utility model discloses a flat diaphragm type pressure transmitter, wherein, including the process connect, serve threaded connection to have the tail-end joint of electrified cable at process joint one, threaded connection's transition piece, interference fit's pressure sensing core and the strainometer that is equipped with bottom the pressure sensing core on the transition piece on the other end, and be equipped with in the process connect with the tail-end joint go up the integrated circuit board that cable and strainometer electricity are connected. The utility model discloses have application scope wider, do benefit to the loading and unloading and improve the product precision, and stable performance and the durable effect of structure.

Description

Flat membrane type pressure transmitter

Technical Field

The utility model relates to a for measuring the changer field, in particular to flat diaphragm type pressure transmitter.

Background

At present, when a pressure transmitter with a sandy viscous medium is measured on the market, the pressure sensing part of the pressure transmitter mainly has two modes, one mode is a pressure sensing film with a glass texture shape which is flush with the front end of an installation thread (M20 × 1.5 or G1/2), and the pressure sensing film is only 0.05 mm; the second is a pressure sensing core with a front end surface protruding about 10mm from the mounting thread (M20 × 1.5, or G1/2), the pressure sensing core has a smooth outer surface, an outer diameter smaller than the inner diameter of the mounting thread, and a pressure sensing diaphragm of 1-2 mm. The first mode is used in the special environment, and is suitable for short distance because the diaphragm is very thin and is easily damaged by sand impact. In the second mode, although the problem of the first mode can be solved, the machining process is to weld the pressure sensing core body and the process joint by argon arc welding. The argon arc welding process can produce stress action on the pressure sensing core body, and can also have heat influence on the strainometer attached to the interior, so that the performance of the strainometer is directly influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a flat diaphragm type pressure transmitter with wider application range, easy loading and unloading, improved product precision, and stable performance and durable structure.

In order to achieve the above object, the utility model provides a pair of flat diaphragm type pressure transmitter, wherein, including the process connect, serve threaded connection to have the tail joint of electrified cable at process joint, the transition piece that threaded connection has on the other end, interference fit's pressure sensing core and the strainometer that is equipped with bottom the pressure sensing core on the transition piece, and be equipped with in the process connect with the tail joint on the cable and the strainometer electricity integrated circuit board be connected.

In some embodiments, the process connection is comprised of a large connecting tube and a small connecting tube that are integrally formed. The inner walls of the pipe openings of the large connecting pipe and the small connecting pipe are provided with internal threads. The tail joint is provided with a first external thread connected with a thread on the large connecting pipe, the transition piece mainly comprises a middle through pipe body, and the transition piece is provided with a second external thread connected with a thread on the small connecting pipe. Thus, the sealing connection of the pressure-sensitive region to the process connection is improved. The pressure sensing core and the process connection are connected together and sealed by a transition piece. The pressure sensing core body and the transition piece are in interference fit, so that the pressure sensing core body and the filtering workpiece can achieve sufficient sealing performance and sufficient rigidity. The pressure sensing core body, the transition piece and the process joint are connected together, and the sealing performance of 120MPa pressure can be achieved. Meanwhile, due to the special connection mode of the three components, when the product installation (screwing the threaded connector) operation is executed, the stress applied to the process connector cannot be directly transmitted to the pressure sensing core body, so that the pressure sensing core body still deforms under the action of the pressure applied in the established mode.

In some embodiments, the transition piece is provided with an annular groove at a location inside the orifice corresponding to the small connection, the annular groove being provided with a sealing ring that seals the interior of the process connection.

In some embodiments, the pressure sensing core consists essentially of a circular cap with one side recessed inwardly to form a circular disk groove.

In some embodiments, the bottom of the pressure-sensitive core is provided with a pressure-sensitive film having a thickness of 0.5 to 2 mm. Thus, the material of the pressure sensing core is a PH17-4 alloy with good elastic properties. The cross section of the pressure sensing core body is in a U shape, and the bottom of the pressure sensing core body is a double-sided balanced membrane with the thickness of 0.5-2 mm. Foil type metal strain gauge based on Wheatstone bridge principle is closely adhered to the diaphragm. The foil type metal strain gauge is specially designed according to the specific positions of a stretching deformation area and a compression deformation area of the pressure sensing diaphragm. When the pressure sensing diaphragm is pressed and deformed, the metal foil type strain gauge generates bridge unbalance, so that signals are output to the integrated circuit board connected with the metal foil type strain gauge and used for processing signal amplification and transmission.

In some embodiments, the strain gauge is in close proximity to the pressure sensing diaphragm.

The beneficial effects of the utility model are that have application scope wider, do benefit to the loading and unloading and improve the product precision, and stable performance and the durable effect of structure. Because traditional integrated circuit board installs in the outer tube, because of whole relatively long in the use, receive the effort of frequent radial whipping when the product afterbody, if product length is longer, the amplitude of whipping just is longer, leads to the outer tube of product and cable all to receive radial effort easily and leads to damaging. The improved structure is characterized in that an outer pipe is omitted, the integrated circuit board is arranged in the process connector, and then the integrated circuit board is connected with the process connector through a tail connector with a cable, so that the overall length of the product can be reduced to the maximum extent, the influence of field vibration on the product can be reduced, the rigidity of the process connector is improved, the radial pressure acting force can be resisted, and the service life of the product is prolonged. The improved product is applied to the fields with severe environment and very large radial vibration, and the advantages are highlighted. The effects of wider application range and durable structure are realized. The pressure sensing core body in the existing flat-film pressure transmitter is mounted in a manner that a strain gauge is adhered to the interior of the pressure sensing core body with a shallow opening, and then the pressure sensing core body and a process joint are welded together through high-strength argon arc welding. Because high temperature is generated in the welding process, the performance of the strain gauge attached inside is directly influenced, and extra unnecessary stress is generated for the pressure sensing core body. The improved structure is that the pressure sensing core body and the process connector are connected into a whole through a transition piece, the connection mode is through interference fit and threaded connection, no welding procedure exists, stress generated due to welding is avoided, and therefore good repeatability, nonlinearity and stability of the pressure sensing diaphragm during deformation are improved. Therefore, a welding mode is not needed, the stress is reduced to the maximum extent, the strain gauge is protected, and the precision of the product produced in actual production is improved by more than two times compared with that of the existing product. The effects of facilitating loading and unloading, improving product precision and protecting product performance stability are achieved.

Drawings

Fig. 1 is a schematic view of the internal structure of the present invention;

fig. 2 is a schematic view of the exploded structure of the present invention.

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1-2, a flat-diaphragm pressure transmitter includes a process connector 1, a tail connector 2 with a cable and connected to one end of the process connector 1 through a screw, a transition piece 3 connected to the other end of the process connector 1 through a screw, a pressure sensing core 4 in interference fit with the transition piece 3, a strain gauge 5 disposed at the bottom of the pressure sensing core 4, and an integrated circuit board 6 disposed in the process connector 1 and electrically connected to the cable and the strain gauge 5 of the tail connector 2. The process joint 1 is mainly formed by integrally forming a large connecting pipe 11 and a small connecting pipe 12. The inner walls of the pipe openings of the large connecting pipe 11 and the small connecting pipe 12 are provided with inner threads 10. The tail joint 2 is provided with a first external thread connected with a thread on the large connecting pipe 11, the transition piece 3 mainly comprises a middle through pipe body, and the transition piece 3 is provided with a second external thread connected with a thread on the small connecting pipe 12. The sealing connection structure of the pressure sensing part and the process joint 1 is improved. The pressure sensing core 4 and the process connection 1 are connected together and sealed by a transition piece. The pressure sensing core body 4 and the transition piece are in interference fit, so that the pressure sensing core body and the filtering workpiece can achieve enough sealing performance and enough rigidity. The pressure sensing core body 4, the transition piece 3 and the process joint 1 are connected together, and the sealing performance of 120MPa pressure can be achieved. Meanwhile, due to the special connection mode of the three, when the product installation (screwing the threaded connector) operation is executed, the stress applied to the process connector 1 cannot be directly transmitted to the pressure sensing core body 4, so that the pressure sensing core body 4 still deforms under the action of the pressure applied in a set mode. The transition piece 3 is provided with an annular groove 8 at the inner side of the pipe orifice corresponding to the small connection, and a sealing ring 9 inside the sealing process joint 1 is arranged in the annular groove 8. The pressure-sensitive core 4 is mainly composed of a circular cover having a circular groove formed by recessing one side inward. The bottom of the pressure sensing core body 4 is provided with a pressure sensing film 7 with the thickness of 0.5-2 mm. The material of the pressure-sensitive core 4 is a PH17-4 alloy having good elastic properties. The cross section of the pressure sensing core body 4 is U-shaped, and the bottom of the pressure sensing core body is provided with a pressure sensing film 7 with the thickness of 0.5-2 mm. Foil type metal strain gauge 5 of Wheatstone bridge principle is closely pasted on the diaphragm. The foil type metal strain gauge 5 is specially designed according to the specific positions of the stretching deformation area and the compression deformation area of the pressure sensing diaphragm 7. When the pressure sensing diaphragm 7 is deformed by pressure, the metal foil type strain gauge 5 is unbalanced in a bridge, thereby outputting a signal to the integrated circuit board 6 connected with the metal foil type strain gauge for processing signal amplification and transmission. The strain gauge 5 is closely attached to the pressure sensing diaphragm 7.

During the application, because traditional integrated circuit board 6 is installed in the outer tube, because of whole than longer in the use, receive frequent radial whipping's effort when the product afterbody, if product length is longer, the amplitude of whipping just is longer, leads to the outer tube of product and cable all to receive radial effort easily and leads to damaging. The improved structure is characterized in that an outer pipe is omitted, an integrated circuit board 6 is arranged in a process connector 1, and then the integrated circuit board is connected with the process connector 1 through a tail connector 2 with a cable, so that the overall length of the product can be reduced to the maximum extent, the influence of field vibration on the product can be reduced, the rigidity of the process connector 1 is improved, the radial pressure acting force can be resisted, and the service life of the product is prolonged. The improved product is applied to the fields with severe environment and very large radial vibration, and the advantages are highlighted. In addition, the pressure sensing core 4 of the existing flat-film pressure transmitter is mounted in a way that the strain gauge 5 is firstly adhered inside the pressure sensing core 4 with a shallow opening, and then the pressure sensing core 4 and the process joint 1 are welded together through high-strength argon arc welding. Since high temperature is generated during the welding process, the performance of the strain gauge 5 attached inside is directly affected, and additional unnecessary stress is generated on the pressure sensing core 4. The improved structure is that the pressure sensing core body 4 and the process connector 1 are connected into a whole through a transition piece, the connection mode is through interference fit and threaded connection, no welding procedure exists, stress generated due to welding is avoided, and therefore good repeatability, nonlinearity and stability of the pressure sensing diaphragm 7 during deformation are improved. Therefore, a welding mode is not needed, the stress is reduced to the maximum extent, the strain gauge 5 is protected, and the precision of the product produced in actual production is improved by more than two times compared with that of the existing product. The effects of facilitating loading and unloading, improving product precision and protecting product performance stability are achieved.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. The flat membrane type pressure transmitter is characterized by comprising a process connector, a tail connector with a cable, a transition piece, a pressure sensing core body and a strain gauge, wherein the tail connector is in threaded connection with one end of the process connector, the transition piece is in threaded connection with the other end of the process connector, the pressure sensing core body is in interference fit with the transition piece, the strain gauge is arranged at the bottom of the pressure sensing core body, and an integrated circuit board which is electrically connected with the cable and the strain gauge on the tail connector is arranged in the process connector.

2. The flat film pressure transmitter of claim 1 wherein said process connection is comprised of a large connecting tube and a small connecting tube integrally formed together; the inner walls of the pipe orifices of the large connecting pipe and the small connecting pipe are provided with internal threads;

the tail joint is provided with a first external thread connected with the thread on the large connecting pipe;

the transition piece mainly comprises a middle through pipe body;

and the transition piece is provided with a second external thread connected with the thread on the small connecting pipe.

3. The flat film pressure transmitter of claim 2 wherein said transition piece is provided with an annular groove at a location inboard of the orifice corresponding to the small connection; and a sealing ring inside the joint in the sealing process is arranged in the annular groove.

4. The flat film pressure transmitter of claims 1, 2 or 3 wherein the pressure sensing core is comprised of a circular cover with one side recessed inwardly to form a circular disk groove.

5. The flat film pressure transmitter of claim 2 wherein the bottom of the pressure sensing core is provided with a pressure sensing diaphragm having a thickness of 0.5-2 mm.

6. The flat diaphragm pressure transmitter of claim 5 wherein the strain gage is closely adjacent the pressure sensing diaphragm.