CN114414129A - Isolated force transmission device - Google Patents

Isolated force transmission device Download PDF

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Publication number
CN114414129A
CN114414129A CN202111521268.6A CN202111521268A CN114414129A CN 114414129 A CN114414129 A CN 114414129A CN 202111521268 A CN202111521268 A CN 202111521268A CN 114414129 A CN114414129 A CN 114414129A
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CN
China
Prior art keywords
pressure
seat
taking
hole
sensor module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111521268.6A
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Chinese (zh)
Inventor
杨劲松
刘庆
王小文
朱健
何炳伟
金亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHONGQING WECAN PRECISION INSTRUMENTS Co
Original Assignee
CHONGQING WECAN PRECISION INSTRUMENTS Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHONGQING WECAN PRECISION INSTRUMENTS Co filed Critical CHONGQING WECAN PRECISION INSTRUMENTS Co
Priority to CN202111521268.6A priority Critical patent/CN114414129A/en
Publication of CN114414129A publication Critical patent/CN114414129A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
    • G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
    • G01L7/08—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the flexible-diaphragm type
    • G01L7/082—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the flexible-diaphragm type construction or mounting of diaphragms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
    • G01L13/02—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements
    • G01L13/025—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements using diaphragms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
    • G01L13/06—Devices or apparatus for measuring differences of two or more fluid pressure values using electric or magnetic pressure-sensitive elements

Abstract

The invention discloses an isolated force transmission device, which comprises a sensor module and a block-shaped pressure guide seat, wherein the sensor module and the pressure guide seat are arranged in a separated manner; an induction cavity is arranged in the sensor module, and a pressure sensitive element is arranged in the induction cavity; the pressure guide seat is provided with a pressure guide channel, and the two ends of the pressure guide channel are respectively provided with an inlet and an outlet; the inlet of the pressure guide channel is a bell mouth, and an elastic isolation diaphragm is hermetically covered on the bell mouth; the outlet of the pressure guide channel is communicated with the induction cavity through a pressure guide pipe, and the pressure guide channel, the pressure guide pipe and the induction cavity are filled with liquid pressure transfer media. The invention has the beneficial effects that: the sensor module is not directly contacted with the pressure guiding seat, but pressure transmission is realized by a liquid pressure transmission system, so that stress deformation of the sensor module possibly caused by the fastening installation of the sensor module and the pressure guiding seat in the prior art is avoided, and the influence of the installation mode on the measurement precision of the sensor is avoided.

Description

Isolated force transmission device
Technical Field
The invention relates to a pressure measuring device, in particular to an isolation force transmission device.
Background
The core part of the differential pressure transmitter is a diaphragm type differential pressure sensor and a pressure taking device, the pressure taking device transmits the pressure of external fluid to the diaphragm type differential pressure sensor, the diaphragm type differential pressure sensor comprises two disc-shaped diaphragm seats, the edges of the two diaphragm seats are welded, a diaphragm deformation cavity is arranged between the two diaphragm seats, a measuring diaphragm is arranged between the two diaphragm seats, two diaphragm seats are respectively penetrated with a pressure transmission channel, the external pressure to be measured is introduced into the two sides of the measuring diaphragm, and the size of the deformation of the measuring diaphragm reflects the differential pressure. For the capacitance type differential pressure sensor, the deformation of the diaphragm is measured to change the output capacitance signal, and then a detection circuit at the rear end processes the change of the capacitance signal to obtain a differential pressure value of the applied pressure.
The diaphragm type differential pressure sensor is extremely sensitive to stress change, and in the installation and use process, the external acting force can cause the diaphragm seat to generate weak deformation, so that the measurement diaphragm is deformed from the normal position, and the small deformation can also generate great influence on the measurement precision. When an existing differential pressure transmitter is assembled, as shown in fig. 1, a diaphragm type differential pressure sensor is generally fastened and installed on a pressure leading seat, two pressure leading channels are formed in the pressure leading seat, an installation cavity is formed between the two pressure leading channels in the pressure leading seat, and the diaphragm type differential pressure sensor is installed on the bottom surface of the installation cavity through screws. Two pressure leading pipes are led out from the differential pressure sensor, the two pressure leading pipes correspond to and are communicated with the two pressure leading channels one by one, and the two pressure leading channels are sealed and covered with isolation diaphragms on openings on the surfaces of the pressure leading seats. And pressure taking seats used for being connected with an external pressure source are respectively covered outside the two isolating diaphragms. The two pressure taking seats are respectively positioned on a pair of opposite side walls of the pressure guiding seat and are connected through bolts so as to clamp the pressure guiding seat. However, due to the existence of manufacturing tolerance and assembly stress, the membrane seat of the diaphragm type differential pressure sensor is inevitably subjected to stress deformation, and the measurement precision is influenced.
Disclosure of Invention
In view of the above, the present invention provides an isolated force transfer device.
The technical scheme is as follows:
the key point of the isolating force transmission device is that the isolating force transmission device comprises a sensor module and a block-shaped pressure guide seat, wherein the sensor module and the pressure guide seat are arranged in a separated mode;
an induction cavity is arranged in the sensor module, and a pressure sensitive element is arranged in the induction cavity;
the pressure guide seat is provided with a pressure guide channel, and the two ends of the pressure guide channel are respectively provided with an inlet and an outlet;
the inlet of the pressure guide channel is a bell mouth, and an elastic isolation diaphragm is hermetically covered on the bell mouth;
the outlet of the pressure guide channel is communicated with the induction cavity through a pressure guide pipe, and the pressure guide channel, the pressure guide pipe and the induction cavity are filled with liquid pressure transfer media.
As a preferred technical scheme, the pressure guide seat is provided with two pressure guide channels, outlets of the pressure guide channels are arranged on the upper surface of the pressure guide seat, and inlets of the two pressure guide channels are arranged on two side surfaces of the pressure guide seat respectively;
the sensor module is internally provided with two induction cavities which are formed by dividing the pressure sensitive element, and the two induction cavities are respectively communicated with the outlet of the corresponding pressure guide channel through one pressure guide pipe;
the pressure guiding pipes are hard pipes, and the two pressure guiding pipes support the sensor module so as to be suspended above the pressure guiding seat.
As a preferred technical scheme, the pressure guiding seat comprises a cylindrical part, the end face of the cylindrical part is positioned on a vertical plane, a sensor mounting block is arranged on the circumferential surface of the cylindrical part, and the sensor mounting block is positioned above the cylindrical part;
inlets of the two pressure guide channels are respectively arranged on two end faces of the cylindrical part;
and two pressure taking seats are respectively arranged on two end faces of the cylindrical part, are covered on the corresponding isolating diaphragm in a buckling manner, and respectively abut against and seal two end faces of the cylindrical part.
As a preferred technical scheme, a pressure taking hole is formed in the surface, facing the isolation diaphragm, of the pressure taking seat, the pressure taking hole is a blind hole, the pressure taking hole is opposite to the isolation diaphragm to form a pressure taking area, and the pressure taking area is communicated with a pressure taking flow passage formed in the pressure taking seat.
As a preferable technical scheme, an assembly hole is formed in the pressure taking seat surface where the opening of the pressure taking hole is located, the aperture of the assembly hole is larger than that of the pressure taking hole, the assembly hole and the pressure taking hole share a hole center line to form a stepped hole, and the inner wall of the assembly hole is sleeved at the corresponding end of the cylindrical portion.
As a preferred technical scheme, a ring groove is formed in the bottom of the assembling hole, surrounds the pressure taking hole, and is internally provided with a sealing ring which seals the bottom of the assembling hole with the corresponding end face of the cylindrical part.
As a preferred technical scheme, at least two screw holes penetrate through the pressure taking seat, the screw holes are arranged in parallel to the assembly holes, and all the screw holes are distributed around the assembly holes;
and bolts penetrate through corresponding screw holes in the two pressure taking seats, so that the two pressure taking seats clamp the cylindrical part.
As a preferred technical scheme, the pressure taking channel penetrates through the pressure taking seat, and the pressure taking channel is vertically intersected and communicated with the assembling hole;
pressure taking flanges are respectively and integrally formed on the side walls of the pressure taking seat corresponding to the two ports of the pressure taking flow channel, and the two ports of the pressure taking flow channel respectively penetrate out of the corresponding pressure taking flanges.
As a preferred technical solution, the sensor module is a differential pressure sensor module, the differential pressure sensor module includes two first membrane holders, a membrane serving as the pressure sensing element is sandwiched between the two first membrane holders, edges of the two first membrane holders are butt-welded to fix the membrane, and a sealed sensing cavity is formed between each first membrane holder and the membrane;
a pressure stabilizing block is arranged outside each first film seat and fixedly connected with the outer edge of the corresponding first film seat in a sealing manner, a pressure stabilizing cavity is enclosed between the pressure stabilizing block and the corresponding first film seat, and the pressure stabilizing cavity and the induction cavity positioned on the same side of the diaphragm are respectively arranged on two sides of the corresponding first film seat;
the pressure stabilizing cavity is communicated with the pressure leading pipe positioned on the same side of the diaphragm.
According to a preferable technical scheme, the inner end of the pressure leading pipe is opened in the corresponding induction cavity, the pressure leading pipe penetrates through the first membrane seat and the pressure stabilizing block which are positioned on the same side of the membrane in an outward sealing mode, and the pressure stabilizing cavity is opened in the corresponding pressure stabilizing cavity to be communicated with the pressure stabilizing cavity.
As the preferred technical scheme, the pressure leading pipe comprises a straight pipe and a bent pipe;
the straight pipe penetrates through the center of the first membrane seat, and two ends of the straight pipe are respectively provided with an opening on the inner side surface and the outer side surface of the first membrane seat;
the pressure stabilizing block is provided with a pressure stabilizing block, the pressure stabilizing block is provided with a pressure stabilizing channel, the pressure stabilizing block is provided with a pressure stabilizing hole, the pressure stabilizing hole is provided with a pressure stabilizing hole, the pressure stabilizing block is provided with a pressure stabilizing hole, the pressure stabilizing hole is provided with a pressure stabilizing block, the pressure stabilizing block is provided with an inner side surface, the pressure stabilizing block is provided with an inner end opening, the inner end of the pressure stabilizing block is opposite to the outer end of the straight pipe, the outer end of the pressure stabilizing block penetrates out of the pressure stabilizing hole outwards, and then the pressure stabilizing block is inserted into the pressure guide channel, and the outer wall of the pressure stabilizing block is sealed.
Compared with the prior art, the invention has the beneficial effects that: the sensor module is not directly contacted with the pressure guiding seat, but pressure transmission is realized by a liquid pressure transmission system, so that stress deformation of the sensor module possibly caused by the fastening installation of the sensor module and the pressure guiding seat in the prior art is avoided, and the influence of the installation mode on the measurement precision of the sensor is avoided.
Drawings
FIG. 1 is a schematic view of a mounting structure of a sensor module and a pressure-inducing seat in the prior art;
FIG. 2 is an exploded view of the measurement module with the sensor module assembled with the pressure-inducing seat;
FIG. 3 is a schematic view of a first view of a measurement module;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3;
FIG. 6 is a schematic diagram of a second view of the measurement module;
FIG. 7 is a cross-sectional view taken along line B-B of FIG. 6;
fig. 8 is a schematic structural diagram of a sensor module.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
As shown in fig. 2, 3 and 6, an isolated force transfer device comprises a sensor module 100 and a block-shaped pressure guide seat 200, wherein the sensor module 100 is arranged separately from the pressure guide seat 200. A sensing cavity 130 is arranged in the sensor module 100, and a pressure sensing element is arranged in the sensing cavity 130. The pressure guide seat 200 is provided with a pressure guide channel 210, and two ends of the pressure guide channel 210 are respectively an inlet and an outlet; the inlet of the pressure guide channel 210 is a bell mouth, and an elastic isolation diaphragm 220 is hermetically covered on the bell mouth; the outlet of the pressure guiding channel 210 is communicated with the sensing cavity 130 through a pressure guiding pipe 160, and the pressure guiding channel 210, the pressure guiding pipe 160 and the sensing cavity 130 are filled with a liquid pressure transmission medium, such as silicone oil.
The isolating force transmission device forms a force transmission system by virtue of an isolating diaphragm 220, and silicone oil in the pressure guide channel 210, the pressure guide pipe 160 and the sensing cavity 130, so as to realize pressure transmission. However, the sensor module 100 does not directly contact the block-shaped pressure guide 200, so that the assembly stress is prevented from affecting the measurement accuracy.
In this embodiment, as shown in fig. 3 and 4, the pressure guide seat 200 is provided with two pressure guide channels 210, outlets of the pressure guide channels 210 are both opened on the upper surface of the pressure guide seat 200, and inlets of the two pressure guide channels 210 are respectively opened on two side surfaces of the pressure guide seat 200. The sensor module 100 is provided with two sensing cavities 130 separated by the pressure sensitive element, and the two sensing cavities 130 are respectively communicated with the outlet of the pressure guiding channel 210 through one pressure guiding pipe 160. The pressure guiding pipes 160 are hard pipes, and the two pressure guiding pipes 160 support the sensor module 100 to be suspended above the pressure guiding base 200. This arrangement prevents sensor module 100 from being securely connected to pressure-introducing base 200.
As shown in fig. 2, the pressure guide base 200 includes a cylindrical portion 201, an end surface of the cylindrical portion 201 is located on a vertical plane, a sensor mounting block 202 is integrally formed on a circumferential surface of the cylindrical portion 201, and the sensor mounting block 202 is located above the cylindrical portion 201.
The inlets of the two pressure guide channels 210 are respectively arranged on the two end surfaces of the cylindrical part 201. The pressure guiding channel 210 comprises a vertical section and a horizontal section (not shown in the figure), wherein the upper end of the vertical section is opened on the upper surface of the pressure guiding seat 200, the lower end of the vertical section is connected with the horizontal section, one end of the horizontal section is communicated with the lower end of the vertical section, and the other end of the horizontal section extends outwards to the end surface of the cylindrical portion 201. The centers of the two bell mouths are respectively positioned at the centers of the end surfaces of the two cylindrical parts 201, the horizontal sections of the two pressure guiding channels 210 are staggered with each other, and the outer ends of the horizontal sections are opened on the inner wall of the bell mouth and are deviated from the central position.
As shown in fig. 2, 3, 5 to 7, two end faces of the cylindrical portion 201 are respectively provided with a pressure taking seat 300, the pressure taking seats 300 are covered on the corresponding isolation diaphragm 220, and the two pressure taking seats 300 respectively abut against and seal the two end faces of the cylindrical portion 201.
The surface of the pressure taking seat 300 facing the isolation diaphragm 220 is provided with a pressure taking hole 310, the pressure taking hole 310 is a blind hole, the pressure taking hole 310 is opposite to the isolation diaphragm 220 to form a pressure taking area, and the pressure taking area is communicated with a pressure taking flow passage 330 arranged on the pressure taking seat 300. The pressure taking channel 330 penetrates through the pressure taking seat 300, and the pressure taking channel 330 is vertically intersected and communicated with the assembling hole 320.
As shown in fig. 2, pressure-taking flanges 340 are integrally formed on the side walls of the pressure-taking seat 300 corresponding to the two ports of the pressure-taking flow channel 330, and the two ports of the pressure-taking flow channel 330 respectively penetrate through the corresponding pressure-taking flanges 340.
The pressure taking seat 300 with the opening of the pressure taking hole 310 is provided with an assembling hole 320, the aperture of the assembling hole 320 is larger than that of the pressure taking hole 310, the assembling hole 320 and the pressure taking hole 310 share a hole center line to form a step hole, and the inner wall of the assembling hole 320 is sleeved at the corresponding end part of the cylindrical part 201. The bottom of the assembly hole 320 is provided with a ring groove, the ring groove surrounds the pressure taking hole 310, a sealing ring 321 is arranged in the ring groove, and the bottom of the assembly hole 320 is sealed with the corresponding end face of the cylindrical part 201 by the sealing ring 321.
At least two screw holes 350 are formed through the pressure taking seat 300, the screw holes 350 are arranged in parallel to the assembling holes 320, and all the screw holes 350 are distributed around the assembling holes 320. Bolts are inserted into corresponding screw holes 350 on the two pressure taking bases 300, so that the two pressure taking bases 300 clamp the cylindrical portion 201.
The two pressure taking seats 300 are symmetrically arranged, the assembling mode between the two pressure taking seats and the cylindrical part 201 is simple and compact in structure, and the influences of dimensional tolerance and assembling stress on a force transmission system are reduced to the greatest extent, for example, the deformation of the isolation diaphragm 220 possibly caused by the assembling stress is reduced.
As shown in fig. 8, in this embodiment, the sensor module 100 is a differential pressure sensor module, the differential pressure sensor module includes two first film holders 110, a diaphragm 120 serving as the pressure sensing element is interposed between the two first film holders 110, edges of the two first film holders 110 are butt-welded to fix the diaphragm 120, and a sealed sensing cavity 130 is formed between each first film holder 110 and the diaphragm 120.
A pressure stabilizing block 140 is arranged outside each first film seat 110, the pressure stabilizing block 140 is fixedly connected with the outer edge of the corresponding first film seat 110 in a sealing manner, a pressure stabilizing cavity 150 is defined between the pressure stabilizing block 140 and the corresponding first film seat 110, and the pressure stabilizing cavity 150 and the induction cavity 130 positioned on the same side of the membrane 120 are respectively arranged on two sides of the corresponding first film seat 110. The pressure-stabilizing chamber 150 communicates with the pressure-introducing tube 160 on the same side as the diaphragm 120.
The inner end of the pressure guiding pipe 160 is opened in the corresponding sensing cavity 130, the pressure guiding pipe 160 penetrates through the first film seat 110 and the pressure stabilizing block 140 which are positioned on the same side of the film 120 in an outward sealing mode, and the pressure stabilizing cavity 150 is opened in the corresponding pressure stabilizing cavity to be communicated with the pressure stabilizing cavity 150. For each first film seat 110, the hydraulic pressure in the pressure stabilizing cavities 150 on the two sides of the first film seat is always consistent with that in the induction cavity 130, so that the outward deformation of the first film seat 110 in a high-pressure state can be inhibited, and the measurement precision is improved.
In this embodiment, the pressure-stabilizing block 140 is a second film seat, and the structure of the second film seat is the same as that of the first film seat 110. The first membrane holder 110 is disc-shaped, the first membrane holder 110 includes an inner disc 111 made of glass and an outer disc 112 made of metal, a groove is formed on an inner side surface of the inner disc 111, the inner disc 111 and the outer disc 112 are fused, and an outer side surface and an edge of the inner disc 111 are covered by the outer disc 112. The diaphragm 120 is made of metal, and the edges of the outer disks 112 of the two first diaphragm seats 110 clamp the edges of the diaphragm 120 and are welded to connect them, so as to tension the diaphragm 120. The grooves on the second membrane holders face the corresponding outer side surfaces of the first membrane holders 110.
One specific structure of the pressure introduction pipe 160 is that the pressure introduction pipe 160 includes a straight pipe 161 and a bent pipe 162. A straight pipe 161 penetrates through the center of the first diaphragm seat 110, two ends of the straight pipe 161 are respectively opened on the bottom surface of the groove and the outer side surface of the outer disc 112, and the pipe wall of the straight pipe 161 is sealed with the inner disc 111 and the outer disc 112; an elbow pipe 162 penetrates through the center of the second membrane seat, the inner end of the elbow pipe 162 is opened on the bottom surface of the groove of the second membrane seat, the inner end of the elbow pipe 162 is opposite to the outer end of the straight pipe 161, the outer end of the elbow pipe 162 outwards penetrates through the second membrane seat, and the outer wall of the elbow pipe 162 is sealed with the second membrane seat.
The inner side surface of each inner disc 111 is provided with a plated electrode on the inner wall of the groove. The plated electrode on the inner side of each first film holder 110 and the corresponding side of the film 120 opposite to the plated electrode form a first capacitor, i.e. a measurement capacitor. The plated electrode of each first film holder 110 is connected to a first signal lead 170, and the first signal leads 170 respectively penetrate through the first film holder 110 in a sealed manner.
The plated electrode on the inner side of each second film holder 140 and the corresponding metal surface on the outer side of the first film holder 110 form a second capacitor, i.e., a compensation capacitor. The plated electrode of each second film holder 140 is connected to a second signal lead 180, and the second signal leads 180 respectively penetrate through the second film holders 140 in a sealed manner.
For each first film holder 110 or second film holder 140, the inner disc 111 partially extends outwards beyond the outer circumferential surface of the outer disc 112, so as to form an extension block 113, and the first signal lead 170 or the second signal lead 180 is led out from the inner disc 111 outwards through the extension block 113, so that the first signal lead 170 or the second signal lead 180 and the plated electrode are insulated from the outer disc 112.
The connection point of the first signal lead 170 or the second signal lead 180 and the corresponding film-coated electrode is close to the edge of the corresponding groove, so that the processing is convenient.
After the sensor is assembled, all the outer disks 112 made of metal are welded to the diaphragm 120 to form a conductor, all the outer disks 112 and the diaphragm 120 are connected to the same capacitance lead, the capacitance lead and the first signal lead 170 form two leads for measuring capacitance, and the capacitance lead and the second signal lead 180 form two leads for compensating capacitance. All of the first signal lead 170, the second signal lead 180, and the capacitance lead are connected to an external signal processing circuit.
In the presence of a pressure difference, the diaphragm 120 deforms to the pressure-less side, thereby causing the capacitance of the two first capacitances to change in magnitude, and the resulting capacitance change signals are conducted from the first signal leads 170 to external signal processing circuits, respectively, for use in calculating the differential pressure. As described above, for each first film holder 110, since the hydraulic pressures in the pressure maintaining chambers 150 and the sensing chamber 130 on both sides thereof are always the same, the outward deformation of the first film holder 110 in a high pressure state can be suppressed, thereby improving the measurement accuracy. This is to improve the measurement accuracy from a mechanical point of view.
Since the silicon oil is a medium between the two electrode plates of the second capacitor, the dielectric constant changes when the temperature of the silicon oil changes, so that the capacitance of the compensation capacitor changes. Meanwhile, although the outward deformation of the first diaphragm seat 110 is suppressed, the liquid pressure received by the first diaphragm seat 110 is transmitted to the second diaphragm seat 140 on the same side as the diaphragm 120, so that the second diaphragm seat 140 is slightly deformed outward, and the capacitance of the compensation capacitor is also changed. The formed capacitance change signals are conducted from the second signal leads 180 to an external signal processing circuit, respectively. The signal can be used for detecting parameters such as the temperature and the static pressure of the silicon oil, and can also be substituted into the calculation of the pressure value to correct the differential pressure value measured based on the measuring capacitor, so that the measuring precision of the sensor is further improved from the electrical angle.
The differential pressure sensor module, the pressure leading seat 200 and the pressure taking seat 300 are assembled to form a measuring module.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.

Claims (10)

1. An isolated force transfer device, comprising: the sensor comprises a sensor module (100) and a block-shaped pressure guide seat (200), wherein the sensor module (100) and the pressure guide seat (200) are arranged in a separated mode;
an induction cavity (130) is arranged in the sensor module (100), and a pressure sensitive element is arranged in the induction cavity (130);
the pressure guide seat (200) is provided with a pressure guide channel (210), and the two ends of the pressure guide channel (210) are respectively an inlet and an outlet;
the inlet of the pressure guide channel (210) is a bell mouth, and an elastic isolation diaphragm (220) is hermetically covered on the bell mouth;
the outlet of the pressure guide channel (210) is communicated with the induction cavity (130) through a pressure guide pipe (160), and the pressure guide channel (210), the pressure guide pipe (160) and the induction cavity (130) are filled with liquid pressure transmission media.
2. An isolated force transfer device according to claim 1, wherein: the pressure guide seat (200) is provided with two pressure guide channels (210), outlets of the pressure guide channels (210) are arranged on the upper surface of the pressure guide seat (200), and inlets of the two pressure guide channels (210) are arranged on two side surfaces of the pressure guide seat (200) respectively;
two induction cavities (130) formed by dividing the pressure sensitive element are arranged in the sensor module (100), and the two induction cavities (130) are respectively communicated with the outlet of the corresponding pressure guide channel (210) through one pressure guide pipe (160);
the pressure guiding pipes (160) are hard pipes, and the two pressure guiding pipes (160) support the sensor module (100) to be arranged above the pressure guiding seat (200) in a suspended mode.
3. An isolated force transfer device according to claim 2, wherein: the pressure guide seat (200) comprises a cylindrical part (201), the end face of the cylindrical part (201) is positioned on a vertical plane, a sensor mounting block (202) is arranged on the circumferential surface of the cylindrical part (201), and the sensor mounting block (202) is positioned above the cylindrical part (201);
inlets of the two pressure guide channels (210) are respectively arranged on two end faces of the cylindrical part (201);
two end faces of the cylindrical portion (201) are respectively provided with a pressure taking seat (300), the pressure taking seats (300) are covered on the corresponding isolation diaphragms (220), and the two pressure taking seats (300) respectively abut against and seal the two end faces of the cylindrical portion (201).
4. An isolated force transfer device according to claim 3, wherein: the pressure taking seat (300) is provided with a pressure taking hole (310) on the surface facing the isolation diaphragm (220), the pressure taking hole (310) is a blind hole, the pressure taking hole (310) is opposite to the isolation diaphragm (220) to form a pressure taking area, and the pressure taking area is communicated with a pressure taking flow channel (330) arranged on the pressure taking seat (300).
5. An isolated force transfer device according to claim 4, wherein: an assembling hole (320) is formed in the surface of the pressure taking seat (300) where the opening of the pressure taking hole (310) is located, the aperture of the assembling hole (320) is larger than that of the pressure taking hole (310), the assembling hole (320) and the pressure taking hole (310) share a hole center line to form a step hole, and the inner wall of the assembling hole (320) is sleeved at the corresponding end of the cylindrical portion (201).
6. An isolated force transfer device according to claim 5, wherein: the annular groove is formed in the hole bottom of the assembling hole (320), the annular groove surrounds the pressure taking hole (310), a sealing ring (321) is arranged in the annular groove, and the hole bottom of the assembling hole (320) is sealed with the corresponding end face of the cylindrical portion (201) through the sealing ring (321).
7. An isolated force transfer device according to claim 5, wherein: at least two screw holes (350) penetrate through the pressure taking seat (300), the screw holes (350) are arranged in parallel to the assembly holes (320), and all the screw holes (350) are distributed around the assembly holes (320);
bolts penetrate through corresponding screw holes (350) in the two pressure taking seats (300) so that the two pressure taking seats (300) clamp the cylindrical part (201).
8. An isolated force transfer device according to claim 5, wherein: the pressure taking flow channel (330) penetrates through the pressure taking seat (300), and the pressure taking flow channel (330) is vertically intersected and communicated with the assembling hole (320);
pressure taking flanges (340) are respectively and integrally formed on the side walls of the pressure taking seat (300) corresponding to the two ports of the pressure taking flow channel (330), and the two ports of the pressure taking flow channel (330) respectively penetrate out of the corresponding pressure taking flanges (340).
9. An isolated force transfer device according to claim 3, wherein: the sensor module (100) is a differential pressure sensor module, the differential pressure sensor module comprises two first membrane holders (110), a membrane (120) serving as the pressure sensitive element is clamped between the two first membrane holders (110), the edges of the two first membrane holders (110) are in butt welding connection to fix the membrane (120), and a sealed induction cavity (130) is formed between each first membrane holder (110) and the membrane (120);
a pressure stabilizing block (140) is arranged outside each first film seat (110), the pressure stabilizing block (140) is fixedly connected with the outer side edge of the corresponding first film seat (110) in a sealing manner, a pressure stabilizing cavity (150) is defined between the pressure stabilizing block (140) and the corresponding first film seat (110), and the pressure stabilizing cavity (150) and the induction cavity (130) which is positioned on the same side of the diaphragm (120) are respectively arranged on two sides of the corresponding first film seat (110);
the pressure stabilizing cavity (150) is communicated with the pressure leading pipe (160) which is positioned on the same side of the diaphragm (120).
10. An isolated force transfer device according to claim 9, wherein: the inner end of the pressure leading pipe (160) is opened in the corresponding induction cavity (130), the pressure leading pipe (160) penetrates through the first film seat (110) and the pressure stabilizing block (140) which are positioned on the same side of the film (120) in an outward sealing mode, and the pressure stabilizing cavity (150) is opened in the corresponding pressure stabilizing cavity (150) so as to be communicated with the pressure stabilizing cavity (150).
CN202111521268.6A 2021-12-13 2021-12-13 Isolated force transmission device Pending CN114414129A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111521268.6A CN114414129A (en) 2021-12-13 2021-12-13 Isolated force transmission device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111521268.6A CN114414129A (en) 2021-12-13 2021-12-13 Isolated force transmission device

Publications (1)

Publication Number Publication Date
CN114414129A true CN114414129A (en) 2022-04-29

Family

ID=81266314

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111521268.6A Pending CN114414129A (en) 2021-12-13 2021-12-13 Isolated force transmission device

Country Status (1)

Country Link
CN (1) CN114414129A (en)

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