CN113670507A - Pressure balance system of differential pressure sensor - Google Patents
Pressure balance system of differential pressure sensor Download PDFInfo
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- CN113670507A CN113670507A CN202110802538.4A CN202110802538A CN113670507A CN 113670507 A CN113670507 A CN 113670507A CN 202110802538 A CN202110802538 A CN 202110802538A CN 113670507 A CN113670507 A CN 113670507A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
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- 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
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/12—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance, i.e. electric circuits therefor
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a pressure balance system of a differential pressure sensor, which comprises a diaphragm type pressure sensor, wherein the diaphragm type pressure sensor is provided with two pressure transmitting cavities, the two pressure transmitting cavities are respectively connected with a pressure guide pipe, the pressure guide pipe is sealed with the outer wall of the diaphragm type pressure sensor, a closed pressure stabilizing box is arranged outside a housing of the diaphragm type pressure sensor, a space between the pressure stabilizing box and the diaphragm type pressure sensor forms a pressure stabilizing cavity, the two pressure guide pipes respectively penetrate out of the pressure stabilizing box and are sealed with the wall of the pressure stabilizing box, a fluid communication port is arranged on the pipe wall of any one pressure guide pipe corresponding to the pressure stabilizing cavity, and the fluid communication port is used for communicating the pressure guide pipes with the pressure stabilizing cavity. Compared with the prior art, the invention has the beneficial effects that: the pressure stabilizing box with a compact structure is provided for the diaphragm type pressure sensor, one pressure transmitting cavity is skillfully communicated with the pressure stabilizing cavity through the fluid communication port, and the structure of the whole balance system is kept simple while the balance of the internal pressure and the external pressure of the diaphragm type pressure sensor is realized.
Description
Technical Field
The invention relates to a pressure measuring device, in particular to a pressure balance system of a differential pressure sensor.
Background
The detection principle of the flowmeter for detecting the fluid flow is to detect the pressure values of two different points on a fluid flow path, and the fluid flow can be calculated due to the difference of the pressure values of the two points. The main body of this type of flowmeter is a fluid pressure detection device, and the core detection element of the fluid pressure detection device is a diaphragm pressure sensor. The diaphragm type pressure sensor converts two pressure signals of different positions of fluid into the change of a 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 applied pressure.
The diaphragm type pressure sensor comprises two cake-shaped diaphragm seats, a measuring diaphragm is arranged between the two diaphragm seats, and the two diaphragm seats are in butt welding connection and clamp the measuring diaphragm tightly. Pressure transmission cavities for containing liquid pressure transmission media are arranged between the measuring diaphragm and the two diaphragm seats respectively, the two pressure transmission cavities are connected with pressure transmission channels respectively, external pressure to be measured is introduced into the two sides of the measuring diaphragm, and the deformation of the measuring diaphragm is reflected as the change of capacitance signals.
The diaphragm type pressure sensor is connected with the pressure taking module, and the fluid pressure is transmitted to the measuring diaphragm through the pressure taking module. Due to the fact that volume change is extremely tiny when liquid is pressurized, when high-pressure fluid is measured, the internal pressure of a pressure transmission cavity is remarkably increased, two membrane seats have the tendency of outward expansion deformation and mutual separation, welding seams can be cracked when the two membrane seats work for a long time in a high-pressure state, and the diaphragm type pressure sensor is caused to lose effectiveness in an accelerated mode. For this reason, patent document CN112595450A discloses a sealed pressure stabilizing structure for a pressure sensor, in which after a diaphragm sensor is mounted on a pressure-leading seat, a cover body is used to cover the diaphragm sensor, the cover body is hermetically connected with the pressure-leading seat to form a sealed pressure stabilizing cavity, silicone oil is filled in the pressure stabilizing cavity, and the pressure stabilizing cavity and one of the pressure transmitting cavities are connected with the same external pressure source, so as to form a pressure balancing system. Therefore, the external pressure acts on the inside and the outside of the diaphragm type pressure sensor simultaneously, so that the internal pressure and the external pressure are balanced when the sensor works, and the sensor is protected. However, there are problems with this structure. Firstly, the pressure stabilizing cavity has a large volume, consumes more silicone oil, increases the cost, and simultaneously brings challenges to the assembly and sealing between the cover body and the pressure guiding seat. More importantly, in order to simplify the structure, the pressure stabilizing cavity is directly communicated with one pressure transmission cavity in actual design so as to ensure synchronous change of internal and external pressures of the sensor, but the volume change cannot be ignored when the silicon oil is more and expands under heat, so that the silicon oil in the pressure transmission cavity on one side connected with the pressure stabilizing cavity has obvious pressure change on the measuring diaphragm, and the accuracy of the sensor is also influenced. For this reason, it is necessary to further improve the pressure balance system inside and outside the sensor and the corresponding structure.
Disclosure of Invention
In view of the above, the present invention provides a pressure balance system for a differential pressure sensor.
The technical scheme is as follows:
a pressure balance system of a differential pressure sensor comprises a diaphragm type pressure sensor, wherein the diaphragm type pressure sensor is provided with two pressure transmitting cavities which are respectively connected with a pressure leading pipe, the pressure leading pipes are sealed with the outer wall of the diaphragm type pressure sensor, the key point is that a closed pressure stabilizing box is arranged on the outer cover of the diaphragm type pressure sensor, and a space between the pressure stabilizing box and the diaphragm type pressure sensor forms a pressure stabilizing cavity;
the two pressure leading pipes respectively penetrate out of the pressure stabilizing box and are sealed with the wall of the pressure stabilizing box;
the pipe wall of any one of the pressure leading pipes is provided with a fluid communication port corresponding to the pressure stabilizing cavity, and the fluid communication port communicates the pressure leading pipe with the pressure stabilizing cavity.
Compared with the prior art, the invention has the beneficial effects that: the pressure stabilizing box with a compact structure is provided for the diaphragm type pressure sensor, one pressure transmitting cavity is skillfully communicated with the pressure stabilizing cavity through the fluid communication port, and the structure of the whole balance system is kept simple while the balance of the internal pressure and the external pressure of the diaphragm type pressure sensor is realized.
Drawings
FIG. 1 is a schematic view of an installation structure of a diaphragm type pressure sensor and a pressure stabilizing box;
FIG. 2 is a schematic structural diagram of a measurement module composed of a diaphragm type pressure sensor, a pressure guide seat and a pressure taking seat;
FIG. 3 is a schematic view of a positioning boss on the end face of the diaphragm pressure sensor, in which a partial structure of the pressure stabilizing box is hidden;
FIG. 4 is a schematic view of the overall structure of the measurement module;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4;
FIG. 7 is a left side view of FIG. 4;
fig. 8 is a cross-sectional view taken along line C-C of fig. 7.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
As shown in fig. 1 and 2, a pressure balance system of a differential pressure sensor includes a diaphragm pressure sensor 100, the diaphragm pressure sensor 100 is provided with two pressure transmitting cavities, the two pressure transmitting cavities are respectively connected with a pressure guiding pipe 130, the pressure guiding pipe 130 is sealed with an outer wall of the diaphragm pressure sensor 100, a closed pressure stabilizing box 200 is arranged on an outer cover of the diaphragm pressure sensor 100, and a pressure stabilizing cavity 230 is formed in a space between the pressure stabilizing box 200 and the diaphragm pressure sensor 100. The two pressure pipes 130 respectively penetrate out of the pressure stabilizing box 200 and are sealed with the wall of the pressure stabilizing box 200. The wall of any pressure leading pipe 130 is provided with a fluid communication port 140 corresponding to the pressure stabilizing cavity 230, and the fluid communication port 140 communicates the pressure leading pipe 130 with the pressure stabilizing cavity 230. After the diaphragm pressure sensor 100 is installed on the flowmeter, liquid pressure transmission media such as silicon oil are filled in the two pressure transmission cavities, the pressure leading tube 130 and the pressure stabilizing cavity 230. During measurement, the two pressure leading pipes 130 are respectively connected with an external pressure source, the pressure in the pressure transmission cavity is increased, and meanwhile, the pressure in the pressure stabilizing cavity 230 is also increased synchronously with one of the pressure transmission cavities, so that the internal pressure and the external pressure of the diaphragm type pressure sensor 100 are balanced, and the diaphragm type pressure sensor 100 is protected.
In another embodiment, any segment of the impulse tube 130 within the plenum 230 is broken to form the fluid communication port 140. Thus, the fluid flow path between the pressure introduction pipe 130 and the pressure stabilization chamber 230 can be enlarged.
The two pressure guiding pipes 130 are respectively used for connecting an external high-pressure source and a low-pressure source, and a fluid communication port 140 is formed in the pipe wall of the pressure guiding pipe 130 for connecting the high-pressure source, so that the external pressure of the diaphragm type pressure sensor 100 is not less than the internal pressure thereof all the time.
In order to make the diaphragm pressure sensor 100 and the pressure stabilizing box 200 compact, the shape of the inner wall of the pressure stabilizing box 200 is matched with the shape of the outer wall of the diaphragm pressure sensor 100, the inner wall of the pressure stabilizing box 200 is close to the local part of the outer wall of the diaphragm pressure sensor 100 opposite to the inner wall, so that the pressure stabilizing cavity 230 surrounding the diaphragm pressure sensor 100 is formed, and the pressure stabilizing cavity 230 is a thin-layer cavity.
As shown in fig. 1, a pressure pipe via hole is respectively formed on the pressure stabilizing box 200 corresponding to each pressure pipe 130, a pressure pipe sleeve 240 is fixedly inserted in the pressure pipe via hole, the pressure pipe 130 is inserted in the pressure pipe sleeve 240, and the pressure pipe sleeve 240, the pressure pipe 130 and the pressure stabilizing box 200 are sealed.
The length of the pressure guiding pipe sleeve 240 is greater than the wall thickness of the pressure stabilizing box 200, and the outer end of the pressure guiding pipe sleeve 240 extends out of the pressure stabilizing box 200. The longer pressure tube sleeve 240 of length plays better support and positioning action to pressure tube 130, prevents that pressure tube 130 from rocking, shifting, and pressure tube 130 takes place to drag the damage with diaphragm formula pressure sensor 100 junction when avoiding the exogenic action, helps the diaphragm formula pressure sensor 100 that the suspension set up to remain stable.
The pressure guiding pipe via hole is a stepped hole with a larger inner end aperture, the inner end pipe wall of the pressure guiding pipe sleeve 240 is radially thickened to form a pipe wall step 241, and the pipe wall step 241 is matched with the stepped hole. Thus, the stability of the fit between the pressure guiding pipe sleeve 240 and the pressure stabilizing box 200 is improved, the pressure guiding pipe sleeve 240 is prevented from being pressed out under the pressure action of the liquid pressure transmission medium in the pressure stabilizing box 200, and the sealing performance is also improved.
In this embodiment, the diaphragm pressure sensor 100 includes two diaphragm bases 110 and a measuring diaphragm 120, where the two diaphragm bases 110 are butt-welded to each other from left to right, and the measuring diaphragm 120 is fixedly clamped to form the diaphragm pressure sensor 100 with a disk-shaped outer wall, and a pressure transmission cavity is defined between the measuring diaphragm 120 and the two diaphragm bases 110. The pressure stabilizing box 200 is a hollow cylinder, the pressure stabilizing box 200 comprises a cylinder 210, the cylinder 210 is sleeved outside the diaphragm type pressure sensor 100, two ends of the cylinder 210 are respectively covered with a circular end plate 220, the cylinder 210 is respectively welded with the two circular end plates 220, and the two circular end plates 220 are respectively opposite to two ends of the diaphragm type pressure sensor 100.
The two pressure pipes 130 axially extend from the centers of the two membrane holders 110, the two pressure pipes 130 are sealed with the two membrane holders 110, and the two pressure pipes 130 respectively penetrate through the corresponding circular end plates 220.
In order to more stably position the diaphragm pressure sensor 100 in the pressure stabilizing box 200, abutting limiting structures are respectively arranged between the inner walls of the two ends of the pressure stabilizing box 200 and the outer walls of the corresponding end surfaces of the diaphragm pressure sensor 100. In order to make the liquid pressures on the two end faces of the diaphragm pressure sensor 100 the same, the areas of the two end faces of the diaphragm pressure sensor 100 outside the occupied space of the abutting limiting structure are equal. Further, the abutting limiting structures at two ends of the diaphragm type pressure sensor 100 are right and left opposite and symmetrical with respect to the measuring diaphragm 120. Thus, the liquid pressure received by both end faces of the diaphragm type pressure sensor 100 and the abutting force from the surge tank 200 are uniform and symmetrical.
As shown in fig. 1 and 3, the abutting limit structure includes a positioning boss 111 and a positioning recess 221, which are matched with each other, one of which is located on the end surface of the diaphragm pressure sensor 100, and the other of which is located on the inner wall of the end portion of the surge tank 200.
In this embodiment, the positioning bosses 111 are located on the end surface of the diaphragm pressure sensor 100, at least two positioning bosses 111 are arranged on each end surface of the diaphragm pressure sensor 100, all the positioning bosses 111 located on the same end surface of the diaphragm pressure sensor 100 are uniformly distributed around the center of the end surface in the circumferential direction, and the inner wall of the end portion of the pressure stabilizing box 200 corresponding to each positioning boss 111 is respectively provided with a positioning recess 221.
In order to make the abutting force of the pressure stabilizing box 200 on the end face of the diaphragm pressure sensor 100 as uniform as possible. Each end face of the diaphragm pressure sensor 100 is provided with at least two arc-shaped positioning bosses 111, the positioning bosses 111 on the same end face are located on the same ring, and the positioning bosses 111 on the same end face are uniformly distributed around the corresponding pressure guiding pipe 130 in a ring shape. In this embodiment, two arc-shaped positioning bosses 111 are provided on each end surface of the diaphragm pressure sensor 100. As shown in fig. 3, the gaps between the positioning bosses 111 on the same end face communicate the inner area and the outer area of the ring surrounded by all the positioning bosses 111, so as to form a channel for flowing a liquid pressure-transmitting medium.
As shown in fig. 2 and 3, a pressure guide base 300 is disposed below the pressure stabilizing box 200, a positioning groove 310 is disposed on the upper surface of the pressure guide base 300, the bottom of the positioning groove 310 is an arc surface with an upward concave surface, the pressure stabilizing box 200 is disposed in the positioning groove 310, the lower portion of the pressure stabilizing box 200 is located in the positioning groove 310, wherein the cylinder 210 is close to the bottom of the positioning groove 310, and the two circular end plates 220 are respectively close to the two side groove walls of the positioning groove 310. The diaphragm pressure sensor 100 is not in direct contact with the pressure guide base 300 and is surrounded by the liquid pressure medium in the pressure stabilizing cavity 230, so that the diaphragm pressure sensor is suspended relative to the pressure guide base 300.
The pressure guide base 300 is provided with two pressure guide channels 320, the two pressure guide channels 320 are respectively located at two sides of the positioning groove 310, and the two pressure guide channels 320 are connected with the two pressure guide tubes 130 in a one-to-one correspondence manner.
As shown in fig. 1 to 3, a pressure guiding tube socket 321 is disposed at one end of the pressure guiding channel 320 close to the pressure stabilizing box 200, and the pressure guiding tube socket 321 is located below the corresponding pressure guiding tube sleeve 240. The pressure guiding pipe 130 includes a horizontal section 131, a vertical section 133 and a curved section 132. The inner end of the horizontal segment 131 is communicated with the corresponding chamber of the diaphragm pressure sensor 100, and the outer end of the horizontal segment 131 penetrates out of the housing of the diaphragm pressure sensor 100 and then penetrates out of the pressure guiding pipe sleeve 240. The vertical section 133 is arranged under the pressure pipe sleeve 240, the bending section 132 is connected between the upper end of the vertical section 133 and the outer end of the horizontal section 131, the lower end of the vertical section 133 is inserted into the corresponding pressure pipe socket 321, and the lower end of the vertical section 133 is sealed with the corresponding pressure pipe socket 321. The bending portion 132 extends in a direction away from the horizontal portion 131 and is offset downward, and then gradually retracts in a direction close to the horizontal portion 131 and is connected to the vertical portion 133. This structural design of the pressure guiding tube 130 is for the following reasons: because the wall thickness of the voltage stabilizing box 200 is thin, the arrangement of the pressure guiding pipe sleeve 240 with relatively large length ensures that the horizontal section 131 is stably installed on the voltage stabilizing box 200 through the pressure guiding pipe sleeve 240; meanwhile, since the position of the vertical section 133 is limited by the pressure guiding pipe socket 321, after the pressure guiding pipe sleeve 240 with a relatively large length is provided, the horizontal section 131 and the vertical section 133 cannot be directly connected through a pipe body bent at a right angle, and the bent section 132 in this embodiment must be used to connect the horizontal section 131 and the vertical section 133.
As can be seen from fig. 4 and 5, the pressure guiding channel 320 includes a horizontal pressure guiding section and a vertical pressure guiding section, wherein the upper end of the vertical pressure guiding section is provided with a pressure guiding pipe socket 321, the pressure guiding pipe socket 321 is sealed with the inner wall of the vertical pressure guiding section, the lower end of the vertical pressure guiding section is connected with one end of the horizontal pressure guiding section, and the other end of the horizontal pressure guiding section is opened on the outer side wall of the pressure guiding seat 300. The outer wall of the pressure guiding base 300 is provided with pressure guiding ports 330 corresponding to the two horizontal pressure guiding sections, the pressure guiding ports 330 are variable diameter holes, the diameter of the holes is gradually reduced from outside to inside, and the inner ends of the pressure guiding ports 330 are communicated with the outer ends of the horizontal pressure guiding sections. The outer end of the pressure guide port 330 is covered with an isolation diaphragm 340, the isolation diaphragm 340 closes the outer end of the pressure guide port 330, so that one of the pressure transmission cavities, the pressure guide pipe 130, the pressure guide channel 320 and the pressure guide port 330 connected with the pressure transmission cavity form a closed liquid containing cavity, and the other pressure transmission cavity, the pressure guide pipe 130, the pressure guide channel 320, the pressure guide port 330 and the pressure stabilizing cavity 230 connected with the pressure transmission cavity form another closed liquid containing cavity. Every draws and presses the passageway 320 to be connected with and annotates the liquid hole, annotates the one end in liquid hole and the corresponding passageway 320 intercommunication of drawing the pressure, and the other end opening is in drawing the surface of pressing the seat 300, and the outer end of annotating the liquid hole is equipped with can dismantle the end cap. The liquid injection holes are used for respectively filling liquid pressure transfer media into the corresponding liquid containing cavities.
Because one of the liquid containing cavities has one more pressure stabilizing cavity 230, the volumes of the liquid pressure transfer media contained in the two liquid containing cavities are different. When the environmental temperature changes, the volume changes of the liquid pressure transfer media in the two liquid containing cavities are inconsistent, which may cause the pressure change amplitude in the pressure transfer cavities at the two sides to be different, resulting in different capacitance changes of the measuring diaphragm 120. Under the condition, the pressure on two sides of the sensor is unbalanced due to the change of the environmental temperature, and the measurement precision is influenced. Therefore, the liquid containing cavity body without the pressure stabilizing cavity 230 is improved, a liquid storage chamber 350 is arranged on the bottom surface of the pressure guiding seat 300, and a sealing plug is arranged on the opening of the liquid storage chamber 350. The liquid storage chamber 350 is communicated with the liquid containing cavities, the volume of the liquid storage chamber 350 is approximately the same as that of the pressure stabilizing cavity 230, so that the volumes of the liquid pressure transmission media contained in the two liquid containing cavities are approximate, the pressure change amplitude of the liquid pressure transmission media on the two sides of the measuring diaphragm 120 is consistent when the temperature changes, and the measuring deviation caused by the environmental temperature change is balanced. In this embodiment, a liquid storage channel 360 is opened between the liquid storage chamber 350 and the corresponding pressure guiding port 330, and the volume of a liquid containing cavity formed by the liquid storage chamber 350, the liquid storage channel 360, the pressure guiding channel 320, the pressure guiding tube 130 and the pressure transmitting cavity connected thereto is the same as the volume of another liquid containing cavity.
As can be seen from fig. 4 to 8, the openings of the two pressure guiding openings 330 are oppositely arranged on a pair of opposite parallel side walls of the pressure guiding base 300, the side wall of the pressure guiding base 300 where the pressure guiding openings 330 are located is respectively provided with one pressure taking base 400, and the two pressure taking bases 400 are connected with the pressure guiding base 300 through bolts, so as to form a measuring module of the flow meter with the sensor module. Each pressure taking seat 400 is further provided with a pressure taking channel 410 and a pressure taking hole 420, wherein the pressure taking channel 410 is communicated with the pressure taking hole 420, the pressure taking hole 420 is formed in the side wall of the pressure taking seat 400 facing the pressure drawing seat 300, the pressure taking hole 420 is opposite to the corresponding pressure drawing port 330, and a pressure taking area is formed in the area between the pressure taking hole 420 and the corresponding isolation diaphragm 340.
As shown in fig. 1 and 2, signal leads 150 are respectively led out from both sides of the measuring diaphragm 120, two signal leads 150 are also respectively led out from the two diaphragm seats 110 in a sealing manner, and the two signal leads 150 are arranged along a direction parallel to the axis of the diaphragm seat 110. A connector tube 250 is integrally formed on the outer wall of each circular end plate 220, the connector tube 250 is perpendicular to the circular end plate 220, the inner end of the connector tube 250 is connected with the circular end plate 220, a lead through hole penetrates through the circular end plate 220, the lead through hole shares a common hole center line with the corresponding connector tube 250, and the aperture of the lead through hole is smaller than the inner diameter of the connector tube 250. A lead wire connector 260 is embedded in the wire connector tube 250, the signal lead 150 is arranged in the lead wire connector 260 and the lead through hole in a penetrating manner, and the lead wire connector 260 seals the lead through hole.
The assembly structure of the pressure stabilizing box 200 is adapted to the diaphragm type pressure sensor 100. During assembly, the cylinder 210 is sleeved outside the diaphragm pressure sensor 100, and then the two circular end plates 220 are respectively sleeved on the corresponding signal lead 150 and the horizontal section 131, and gradually move towards the corresponding ends of the cylinder 210 and are welded with the corresponding ends in an abutting mode. The signal lead 150 is designed to be parallel to the axial direction of the diaphragm seat 110, so that the pressure stabilizing box 200 is conveniently assembled outside the diaphragm pressure sensor 100.
During measurement, the two pressure taking channels 410 are respectively connected with two points on the fluid flow path, fluid at two different points enters the corresponding pressure taking areas, fluid pressure acts on the corresponding isolation diaphragm 340 and is conducted to the measurement diaphragm 120 through the liquid pressure transmission medium, and therefore the fluid pressure at two positions is measured, and the fluid flow is calculated.
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. The utility model provides a pressure differential sensor pressure balance system, includes diaphragm pressure sensor (100), and this diaphragm pressure sensor (100) is equipped with two pressure transmission cavitys, and two pressure transmission cavitys are connected with respectively and draw pressure pipe (130), draw pressure pipe (130) with the outer wall of diaphragm pressure sensor (100) is sealed, its characterized in that: a closed pressure stabilizing box (200) is arranged on the outer cover of the diaphragm type pressure sensor (100), and a pressure stabilizing cavity (230) is formed in a space between the pressure stabilizing box (200) and the diaphragm type pressure sensor (100);
the two pressure leading pipes (130) respectively penetrate out of the pressure stabilizing box (200) and are sealed with the wall of the pressure stabilizing box (200);
the pipe wall of any one of the pressure leading pipes (130) is provided with a fluid communication port (140) corresponding to the pressure stabilizing cavity (230), and the fluid communication port (140) is used for communicating the pressure leading pipe (130) with the pressure stabilizing cavity (230).
2. The differential pressure sensor pressure equalization system of claim 1, wherein: the portion of any one of the pressure introduction tubes (130) within the pressure stabilization chamber (230) is broken to form the fluid communication port (140).
3. The differential pressure sensor pressure equalization system of claim 1 or 2, wherein: the two pressure guiding pipes (130) are respectively used for connecting an external high-pressure source and a low-pressure source, wherein the pipe wall of the pressure guiding pipe (130) for connecting the high-pressure source is provided with the fluid communication port (140).
4. The differential pressure sensor pressure equalization system of claim 1 or 2, wherein: the shape of the inner wall of the pressure stabilizing box (200) is matched with the shape of the outer wall of the diaphragm type pressure sensor (100), and the inner wall of the pressure stabilizing box (200) is close to the part, right opposite to the inner wall, of the outer wall of the diaphragm type pressure sensor (100) locally, so that the pressure stabilizing cavity (230) surrounding the diaphragm type pressure sensor (100) is formed.
5. The differential pressure sensor pressure equalization system of claim 1 or 2, wherein: a pressure pipe via hole is formed in the pressure stabilizing box (200) corresponding to each pressure pipe (130), a pressure pipe sleeve (240) is fixedly arranged in each pressure pipe via hole in a penetrating manner, the pressure pipe (130) is arranged in the pressure pipe sleeve (240) in a penetrating manner, and the pressure pipe sleeve (240), the pressure pipe (130) and the pressure stabilizing box (200) are sealed;
the length of the pressure guide pipe sleeve (240) is larger than the wall thickness of the pressure stabilizing box (200), and the outer end of the pressure guide pipe sleeve (240) extends out of the pressure stabilizing box (200).
6. The differential pressure sensor pressure equalization system of claim 5, wherein: the pressure guide pipe through hole is a stepped hole with a larger inner end aperture, the inner end pipe wall of the pressure guide pipe sleeve (240) is thickened radially to form a pipe wall step (241), and the pipe wall step (241) is matched with the stepped hole.
7. The differential pressure sensor pressure equalization system of claim 5, wherein: the diaphragm type pressure sensor (100) comprises two diaphragm bases (110) and a measuring diaphragm (120), wherein the two diaphragm bases (110) are in butt welding connection from left to right, the measuring diaphragm (120) is fixedly clamped to form the diaphragm type pressure sensor (100) with a disc-shaped outer wall, and the measuring diaphragm (120) and the two diaphragm bases (110) enclose a pressure transmission cavity;
the pressure stabilizing box (200) is in a hollow cylindrical shape, the pressure stabilizing box (200) comprises a cylinder (210), the cylinder (210) is sleeved outside the diaphragm type pressure sensor (100), two ends of the cylinder (210) are respectively covered with a circular end plate (220), the cylinder (210) is respectively welded with the two circular end plates (220), and the two circular end plates (220) are respectively opposite to two ends of the diaphragm type pressure sensor (100);
the two pressure guiding pipes (130) axially extend out from the centers of the two membrane seats (110) respectively, the two pressure guiding pipes (130) are sealed with the two membrane seats (110) respectively, and the two pressure guiding pipes (130) penetrate through the corresponding circular end plates (220) respectively.
8. The differential pressure sensor pressure equalization system of claim 7, wherein: a pressure guide seat (300) is arranged below the pressure stabilizing box (200), a positioning groove (310) is formed in the upper surface of the pressure guide seat (300), the bottom of the positioning groove (310) is an arc surface with an upward concave surface, the pressure stabilizing box (200) is arranged in the positioning groove (310), the lower part of the pressure stabilizing box (200) is located in the positioning groove (310), the cylinder (210) is close to the bottom of the positioning groove (310), and the two circular end plates (220) are respectively close to the groove walls on the two sides of the positioning groove (310);
two pressure guiding channels (320) are formed in the pressure guiding seat (300), the two pressure guiding channels (320) are respectively located on two sides of the positioning groove (310), and the two pressure guiding channels (320) are in one-to-one correspondence with and connected with the two pressure guiding pipes (130).
9. The differential pressure sensor pressure equalization system of claim 8, wherein: one end of the pressure guide channel (320) close to the pressure stabilizing box (200) is provided with a pressure guide pipe socket (321), and the pressure guide pipe socket (321) is positioned below the corresponding pressure guide pipe sleeve (240);
the pressure guiding pipe (130) comprises a horizontal section (131), a vertical section (133) and a bending section (132);
the inner end of the horizontal segment (131) is communicated with a corresponding cavity of the diaphragm type pressure sensor (100), the outer end of the horizontal segment (131) penetrates out of the shell of the diaphragm type pressure sensor (100) outwards and then penetrates out of the pressure guide pipe sleeve (240), the vertical segment (133) is arranged under the pressure guide pipe sleeve (240), the bent segment (132) is connected between the upper end of the vertical segment (133) and the outer end of the horizontal segment (131), and the lower end of the vertical segment (133) is inserted into the corresponding pressure guide pipe socket (321);
the bending section (132) extends towards the direction far away from the horizontal section (131) and is simultaneously deflected downwards, and then gradually retracts towards the direction close to the horizontal section (131) and is connected with the vertical section (133).
10. The differential pressure sensor pressure equalization system of claim 7, wherein: signal leads (150) are respectively led out from two sides of the measuring diaphragm (120), the two signal leads (150) are respectively led out from the two diaphragm seats (110) in a sealing manner, and the two signal leads (150) are arranged along the direction parallel to the axis of the diaphragm seats (110);
a connector tube (250) is integrally formed on the outer wall of each circular end plate (220), the connector tube (250) is arranged perpendicular to the circular end plates (220), the inner end of the connector tube (250) is connected with the circular end plates (220), a lead through hole penetrates through each circular end plate (220), the lead through hole is concentric with the corresponding connector tube (250), and the aperture of the lead through hole is smaller than the inner diameter of the connector tube (250);
a lead wire connector (260) is embedded in the wire connector tube (250), the signal lead wire (150) penetrates through the lead wire connector (260) and the lead wire through hole, and the lead wire through hole is sealed by the lead wire connector (260).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802538.4A CN113670507A (en) | 2021-07-15 | 2021-07-15 | Pressure balance system of differential pressure sensor |
| PCT/CN2022/102238 WO2023284552A1 (en) | 2021-07-15 | 2022-06-29 | Pressure balance system of differential pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802538.4A CN113670507A (en) | 2021-07-15 | 2021-07-15 | Pressure balance system of differential pressure sensor |
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| WO2023284552A1 (en) * | 2021-07-15 | 2023-01-19 | 重庆市伟岸测器制造股份有限公司 | Pressure balance system of differential pressure sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5684253A (en) * | 1997-01-08 | 1997-11-04 | Honeywell Inc. | Differential pressure sensor with stress reducing pressure balancing means |
| DE102014102483B4 (en) * | 2014-02-26 | 2021-05-27 | Vega Grieshaber Kg | Pressure transmitter with pressure compensation device |
| US11137308B2 (en) * | 2019-01-02 | 2021-10-05 | Baker Hughes, A Ge Company, Llc | High sensitivity pressure sensor package |
| CN110926685A (en) * | 2019-12-05 | 2020-03-27 | 中国航发四川燃气涡轮研究院 | Overload protection device of micro-differential pressure sensor and micro-differential pressure detection system |
| CN112665771A (en) * | 2020-12-29 | 2021-04-16 | 重庆市伟岸测器制造股份有限公司 | Isolated pressure sensor |
| CN112595450A (en) * | 2020-12-29 | 2021-04-02 | 重庆市伟岸测器制造股份有限公司 | Pressure sensor seals steady voltage structure |
| CN215865630U (en) * | 2021-07-15 | 2022-02-18 | 重庆市伟岸测器制造股份有限公司 | Pressure balance system of differential pressure sensor |
| CN113670507A (en) * | 2021-07-15 | 2021-11-19 | 重庆市伟岸测器制造股份有限公司 | Pressure balance system of differential pressure sensor |
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| WO2023284552A1 (en) * | 2021-07-15 | 2023-01-19 | 重庆市伟岸测器制造股份有限公司 | Pressure balance system of differential pressure sensor |
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