KR20190069191A - Pressure transmitter - Google Patents

Abstract

The present invention relates to a pressure transmitter. More specifically, an objective of the present invention is to optimally prepare a binding structure between parts of a pressure transmitter, and use only a torque wrench of a spanner type to tighten or loosen a stopper for fixing a sensor assembly to reduce manufacturing costs of the pressure transmitter and improve assembly and disassembly workability. The pressure transmitter comprises: a connector (10) including an accommodation space (11) whose upper end is opened, a binding unit (13) arranged on a lower portion of the accommodation space (11) and connected to an object to be measured, and a fluid inlet (15) penetrated from a bottom surface of the accommodation space (11) to a lower end of the binding unit; a sealing member (20) of a ring shape arranged around the fluid inlet (15) on the bottom surface of the accommodation space (11); a sensor assembly (30) to detect a pressure of a fluid introduced through the fluid inlet (15) while a lower end surface thereof comes in contact with the sealing member (20); and a stopper (40) which has a penetration space (41) whose upper and lower ends are opened, is inserted into an upper portion of the accommodation space (11) to press and fix the sensor assembly (30), and has at least two planes (43) formed on an outer wall in parallel with each other.

Description

[0001] PRESSURE TRANSMITTER [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure transmitter, and more particularly, to a pressure transmitter for detecting a fluid pressure through a pressure sensor and transmitting a detected signal, for example, installed in a fluid pipe or the like to monitor a pressure fluctuation state of a fluid.

Generally, a pressure transmitter is installed in a piping or a fluid storage tank through which various fluid pumps or fluids pass in a vehicle, a chemical facility, a semiconductor manufacturing facility, or the like, and is used to measure a fluid pressure. Pressure sensor "of Korean Patent Publication No. 0392419 (patent document 1)," pressure sensing device "of Korean Patent Publication No. 2012-0015844, and" level transmitter "of Korean Patent Publication No. 2015-0033316 (patent document 2) .

The structure of the pressure transmitter is mainly composed of a fluid inlet through which fluid flows, a sensor assembly installed near the fluid inlet to sense pressure, and a stopper for fixing the sensor assembly, Diaphragm, or strain gauge. These pressure transmitters must be able to precisely measure the pressure of the fluid, as well as being easy to assemble and disassemble, while at the same time being designed with a stable structure to improve precision and durability In addition, when fixing the sensor assembly using the stopper, since the measurement range of the sensor assembly varies depending on the degree of the force of tightening the stopper, it is possible to use a precise tool such as a torque wrench, Tighten the stopper.

However, the conventional pressure transmitter has a complicated structure and therefore has poor assemblability and productivity. Particularly, since the stopper structure is unreasonable (for example, the groove is formed in the upper end of the cylindrical stopper or the hole is machined) Since a separate jig (for example, a tool for inserting into the groove or hole of the stopper) that mediates a torque wrench and a stopper is applied during use, the assembling and disassembling workability is not good, and a fixture And the foreign material that has fallen from the stopper due to friction between the stopper and the stopper is piled on the substrate of the sensor assembly to cause electrical shorts.

1. Korean Registered Patent No. 0392419 (Registered on July 31, 2003) 2. Republic of Korea Open Patent No. 2012-0015844 (Application filed on February 22, 2012) 3. Korean Patent Publication No. 2015-0033316 (filed on April 1, 2015)

In order to solve the problems inherent in the prior art, the present invention is designed to optimize the interlocking structure of pressure transmitters and to tighten or loosen the stoppers for fixing the sensor assemblies using only a wrench-type torque wrench, An improved pressure transmitter that can reduce the manufacturing cost of the transmitter, further improve assembly and disassembly workability, and ensure that the set torque is accurately transmitted to the stopper to prevent pressure leakage and damage to the sensor assembly (sensor body) The purpose is to provide.

In order to achieve the above object, a pressure transmitter according to the present invention includes a receiving space having an opened upper end, a binding unit connected to a measurement object at a lower portion of the receiving space, A connector through which the fluid inlet is passed; A ring-shaped sealing member disposed on the bottom surface of the accommodation space around the fluid introduction port; A sensor assembly for detecting a pressure of the fluid introduced through the fluid inlet in a state in which the lower surface is in contact with the sealing member; A stopper formed with a through space having an upper end and a lower end opened, a stopper formed in the upper part of the accommodation space to press-fix the sensor assembly and at least two planes parallel to each other on the outer wall surface; And a control unit.

In a preferred embodiment, the accommodating space may be formed inside the cylindrical connector body, a female threaded portion may be formed on the inner wall surface of the connector body, and the through-hole may be formed inside the cylindrical stopper body, And a male screw portion to be fastened to the female screw portion is formed on an outer wall surface of the main body so that the stopper can be fastened in a rotating manner.

The stopper may be tightened or loosened through the torque wrench at any time when the plane is disposed on the upper portion of the male screw portion and the plane is positioned on the upper side of the connector body when the stopper is fastened.

According to a preferred embodiment of the present invention, the sensor assembly includes a sensor body having a fluid inflow space having a lower central opening portion formed therein, a sensing element fixed to the upper side of the inflow space, and a sensor element electrically connected to the sensing element, And a conductive wire extending upward from the substrate.

Meanwhile, the pressure transmitter of the present invention includes: a cylindrical cover body having a space formed therein and a lower end bound to the upper portion of the connector; And a socket coupled to an upper portion of the cover tube, wherein the socket is connected to a wire for transmitting a pressure signal detected by a sensing element of the sensor assembly.

The pressure transmitter according to the present invention is designed in a simple structure and the stopper can be tightened or loosened by using only a commercially available wrench type torque wrench, so that the manufacturing cost of the pressure transmitter can be reduced, It is possible to accurately detect the pressure inputted to the sensor element and further improve the assembling and disassembling workability and also to suppress the generation of foreign substances generated by the friction between the tool and the stopper, It has the advantage of improving the quality and productivity of the transmitter as well as increasing durability and stability.

1 is an exploded perspective view of a pressure transmitter according to the present invention.
2 is an assembled cross-sectional view of a pressure transmitter according to the present invention.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. It is to be understood, however, that the intention is not to limit the invention to the embodiments illustrated, but on the contrary, the intention and scope of the invention encompass conventional variations and equivalents of the illustrated forms.

In addition, throughout the specification, it is to be understood that a portion is referred to as being "directly connected" to another portion, or "indirectly connected" to any element, Means that other elements may be added, without excluding other elements, unless otherwise stated.

FIG. 1 is a perspective view of a pressure transmitter according to the present invention, and FIG. 2 is an assembly sectional view of a pressure transmitter according to the present invention.

1 and 2, the essential part of the pressure transmitter according to the present invention includes a connector 10, a sealing member 20, a pressure sensing sensor assembly 30 and a stopper 40, And a cover tube 50 and a socket 60 as elements for constituting the entire pressure transmitter.

The connector 10 includes a cylindrical connector body 12 forming a housing space 11 having an open upper end. The inner wall surface of the housing space 11, that is, the inner wall surface of the connector body 12, A portion 12a is formed.

The bottom of the accommodation space 11 is provided with a binding portion 13 connected to the pressure measurement object P such as a fluid pipe or a tank for example. ) Through the fluid inlet (15) to the lower end of the binding portion (13).

The coupling portion 13 may be formed with threads on the outer surface such as a bolt and a sealing groove 16 for allowing the sealing member to be inserted into the bottom surface 14 of the accommodation space 11 And a support protrusion 17 for fixing the cover tube 50 to the outer surface of the connector body 12 may be formed.

The sealing member 20 is made of a rubber or a silicone material and is formed in a ring shape so as to be seated in a sealing groove 16 having a donut shape in the bottom surface 14 of the accommodation space 11, 15).

The sensor assembly 30 is pressurized and fixed by the stopper 40 in a state where the lower end surface of the sensor assembly 30 is in contact with the sealing member 20 so that the pressure of the fluid introduced through the fluid inlet 15 .

More specifically, the sensor assembly 30 includes a sensor body 32 formed of a ceramic material and having a fluid inflow space 31 opened at a lower center portion thereof and a sensor body 32 provided at the upper side of the inflow space 31, A PCB substrate 35 electrically connected to the sensing device 33 for amplifying and calibrating a pressure signal detected by the sensing device 33 and a control circuit And an upwardly extending conductive wire 36.

As described above, the sensing element 33 is made of a thin plate material such as a diaphragm or a strain gauge of rubber, metal plate or the like and capable of changing the shape depending on the pressure. More specifically, a fine ceramic ceramic material may be screen printed with the same material of wheatstone.

The substrate 35 and the sensing element 33 may be spaced apart from each other by a predetermined distance so as not to impair the electrical stability of the substrate 35 and the sensing accuracy of the sensing element 33, The lower end of one or more conductive fixing pins 34 is fixed to the sensing element 33 by brazing and the fixing pin 34 is fixed to the substrate 35 in order to maintain the spacing of the sensing element 33. [ It can be fixed by soldering again.

Of course, the connection method of the substrate 35 and the sensing element 33 is not limited to the fixing pin, but may be interconnected by the conductive wire.

The stopper 40 includes a cylindrical stopper body 42 defining a through space 41 having an upper end and a lower end opened and a male screw portion 42a is formed on an outer wall surface of the stopper body 42, The threaded portion 42a and the female threaded portion 12a of the connector 10 are screwed together.

At this time, on the outer wall surface of the stopper 40, at least two planes 43 are formed parallel to each other, so that a wrench (not shown) of a wrench type is engaged with two planes 43 arranged in parallel, It can be rotated and tightened or loosened.

The stopper 40 can be inserted into the upper portion of the accommodation space 11 through the female screw portion 12a and the male screw portion 42a and can be fastened and also the stopper 40 can be rotated using the torque wrench The sensor assembly 30 is pressed by pressing the sensor assembly 30 to fix the sensor assembly 30.

The plane 43 may be formed by, for example, an H-cutting process. When the plane 43 is disposed on the male screw portion 42a, the stopper 40 is fastened to the connector 10 The stopper 40 is rotated through the torque wrench so that the stopper 40 can be further pushed or reversely rotated in the unlocking direction to release the tightening of the stopper 40. [

As a result, since the stopper 40 is inserted into the internal space of the connector body 10, the stopper 40 can be downsized as compared with the case where the stopper 40 is coupled to the outside of the connector body 10, (43), it is easy to manufacture and the manufacturing cost can be reduced.

The cover tube 50 may be formed of, for example, a cylindrical tube, and a space may be formed in the cover tube 50. The lower end of the cover tube 50 may be fastened to the upper portion of the connector 10,

A socket 60 is coupled to the upper portion of the cover tube 50. The socket 60 is connected to a conductive wire 36 extending from the sensor assembly 30 to detect Is transmitted to the socket (60) through the wire (36).

The socket 60 is for connecting a pressure signal to a display device (not shown) for displaying a numerical value or a level or the like, and its shape and arrangement structure are not limited.

The pressure transmitter constructed as described above can be bound to one side of the pipe as an example of the measurement object P through the binding portion 13.

When the pressure transmitter is mounted, the fluid in the piping is filled into the inflow space 31 via the fluid inlet 15 and the sensing element 33 is deformed in accordance with the pressure magnitude of the fluid filled in the inflow space 31 And an electrical signal proportional to the amount of deformation is transmitted to the PCB substrate 35.

At this time, since the electric signal outputted from the sensing element 33 is very weak, the electric signal is amplified and corrected in the PCB substrate 35 and transmitted to the socket 60 through the wire 36, The electrical signal is transmitted to a PLC or Micom connected to the socket 60 and then to a display device, for example a personal computer device, to display the pressure magnitude so that fluid pressure in the pipe can be monitored in real time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It will not.

10 ... connector
11 ... accommodating space 12 ... connector body 12a ... female thread portion
13 ... binding portion 14 ... bottom surface 15 ... fluid inlet
16 ... sealing groove 17 ... supporting jaw
20 ... Sealing member 30 ... Sensor assembly
31 ... inflow space 32 ... sensor body 33 ... sensing element
34 ... fixing pin 35 ... substrate 36 ... wire
40 ... stopper 41 ... penetration space
42 ... stopper body 42a ... male threaded portion 43 ... plane
50 ... Cover tube 60 ... Socket P ... Measured object

Claims (5)

A connector having a receiving space open at an upper end thereof, a coupling unit connected to a measurement object at a lower portion of the receiving space, and a fluid introduction port penetrating from the bottom of the receiving space to a lower end of the coupling unit;
A ring-shaped sealing member disposed on the bottom surface of the accommodation space around the fluid introduction port;
A sensor assembly for detecting a pressure of the fluid introduced through the fluid inlet in a state in which the lower surface is in contact with the sealing member;
A stopper formed with a through space having an upper end and a lower end opened, a stopper formed in the upper part of the accommodation space to press-fix the sensor assembly and at least two planes parallel to each other on the outer wall surface; And a pressure transmitter. The method according to claim 1,
Wherein the accommodating space is formed inside the cylindrical connector body, a female screw portion is formed on an inner wall surface of the connector body,
Wherein the through-hole is formed in a cylindrical stopper body, and a stopper is fastened in a rotatable manner by forming a male screw portion on an outer wall surface of the stopper body to be fastened to the female screw portion. The method of claim 2,
Wherein the plane is disposed on the upper portion of the male screw portion, and the plane is positioned on the upper side of the connector body when the stopper is fastened. The method according to claim 1,
The sensor assembly includes a sensor body having a fluid inflow space in which a lower central portion is opened, a sensing element fixed on the inflow space, and a controller electrically connected to the sensing element to amplify and amplify the pressure signal detected by the sensing element. And outputting the electric signal as an electric signal; and a conductive wire extending upward from the substrate. 5. The method according to any one of claims 1 to 4,
A cover tube having a space formed therein and a lower end coupled to an upper portion of the connector;
A socket coupled to an upper portion of the cover tube and electrically connected to the sensor assembly to receive an electrical signal of the sensor assembly; Further comprising a pressure sensor.

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