CN212158908U - Fluid pressure measuring device and liquid level measuring instrument - Google Patents

Fluid pressure measuring device and liquid level measuring instrument Download PDF

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Publication number
CN212158908U
CN212158908U CN202021190548.4U CN202021190548U CN212158908U CN 212158908 U CN212158908 U CN 212158908U CN 202021190548 U CN202021190548 U CN 202021190548U CN 212158908 U CN212158908 U CN 212158908U
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CN
China
Prior art keywords
accommodating cavity
fluid pressure
measuring
fluid
joint component
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Active
Application number
CN202021190548.4U
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Chinese (zh)
Inventor
李丛
郭泽辰
周志明
赵军华
张清波
邓权
冯阳
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Shenzhen Hongdian Technologies Corp
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Shenzhen Hongdian Technologies Corp
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Priority to CN2020102611556 priority Critical
Priority to CN202010261155.6A priority patent/CN111289168A/en
Application filed by Shenzhen Hongdian Technologies Corp filed Critical Shenzhen Hongdian Technologies Corp
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L7/00Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
    • G01L7/18Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements using liquid as the pressure-sensitive medium, e.g. liquid-column gauges
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/14Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure

Abstract

The utility model discloses a fluid pressure measuring device and liquid level measurement appearance belongs to pressure and liquid level measurement technical field. The fluid pressure measuring device comprises a shell, a first joint component, a second joint component and a pressure sensor, wherein an accommodating cavity for accommodating gas is formed in the shell; one end of the first joint component is communicated with the accommodating cavity, and the other end of the first joint component is communicated with an external air source and can charge compressed air into the accommodating cavity; one end of the second joint component is communicated with the accommodating cavity, and the other end of the second joint component is communicated with the fluid to be measured; the pressure sensor is arranged in the containing cavity in a sealing mode and used for measuring the pressure of compressed air in the containing cavity. The liquid level measuring instrument comprises the fluid pressure measuring device. The utility model discloses a fluid pressure measuring device and liquid level gauge, the integrated level is high, the assembly of being convenient for, and the reliability is high, and application scope is wide.

Description

Fluid pressure measuring device and liquid level measuring instrument
Technical Field
The utility model relates to a pressure and level measurement technical field especially relate to a fluid pressure measuring device and liquid level measuring instrument.
Background
Fluid pressure signal measurement is a very common measurement technical means, and the traditional pressure measurement device mainly has two modes of an absolute pressure mode and a differential pressure mode. The absolute pressure obtained by the absolute pressure type measurement mode is the sum of the pressure of the fluid to be measured and the atmospheric pressure of the surrounding environment, the atmospheric pressure is not a constant value, and the absolute pressure is easily influenced by various factors such as the atmospheric pressure in different regions and different time periods, and the measurement precision is low.
The existing differential pressure type measuring mode needs to put a measuring device into fluid to be measured, and the measuring device has higher requirement on environment. For example, if gas in the gas environment to be tested is corrosive, the testing device is easily corroded, and the testing precision is affected; or more suspended matters exist in the liquid environment to be tested, the suspended matters, microorganisms and the like can be attached to the surface of the testing device, so that the clogging of the testing device is caused, the measurement precision and the sensitivity are greatly reduced, and the use of the testing device is influenced.
The existing non-contact measuring device, such as a bubble type water level measuring instrument, is characterized in that an air pipe is directly arranged on a pressure sensor, the air pipe is put into water to be measured for pressure intensity detection, and water vapor can contact the pressure sensor through the air pipe, so that the water resistance is poor, and the service life of the pressure sensor is influenced; generally, a stainless steel air duct or a plastic air duct interface is adhered to a pressure sensor through glue, an air duct is connected and inserted on the stainless steel or plastic air duct interface, force is required to be applied properly in the inserting process, otherwise the stainless steel or plastic air duct interface is easy to fall off, and the assembly is inconvenient.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a fluid pressure measuring device, simple structure is compact, and the integrated level is high, the assembly of being convenient for, and the reliability is high, and is applicable to multiple measuring environment.
In order to realize the purpose, the utility model adopts the following technical scheme:
a fluid pressure measurement device, comprising:
the shell is internally provided with an accommodating cavity for accommodating gas;
one end of the first joint component is communicated with the accommodating cavity, and the other end of the first joint component is communicated with an external air source and can charge compressed air into the accommodating cavity;
one end of the second joint component is communicated with the accommodating cavity, and the other end of the second joint component is communicated with the fluid to be measured;
and the pressure sensor is hermetically arranged in the accommodating cavity and used for measuring the pressure of the compressed air in the accommodating cavity.
Optionally, a temperature sensor is further installed in the accommodating cavity.
Optionally, the shell is further provided with an opening communicated with the accommodating cavity, and the pressure sensor is arranged on the opening through pouring sealant.
Optionally, the pressure sensor comprises a gauge pressure sensor body and a waterproof air duct connected to the gauge pressure sensor body, the other end of the waterproof air duct extends out of the pouring sealant, and a waterproof air-permeable plug is installed in the waterproof air duct.
Optionally, the pressure measuring device includes a one-way valve connected to the first connector assembly for one-way inflation of external compressed air into the receiving chamber.
Optionally, the check valve is disposed in the accommodating cavity, and the check valve is disposed in a sealing manner with the accommodating cavity.
Optionally, the first joint assembly is sealingly connected to the housing; and/or the second joint assembly is sealingly connected to the housing.
Optionally, the first joint assembly is connected with the housing by a sealant or a hydraulic tape; and/or
The second joint assembly is connected with the shell through sealant or hydraulic adhesive tape.
Optionally, the first connector assembly comprises a gas pipe for communicating the accommodating cavity with an external gas source; and/or
The second joint assembly comprises an air pipe, and the air pipe is used for communicating the accommodating cavity and the fluid to be measured.
Another object of the present invention is to provide a liquid level measuring instrument, which has high reliability and low cost.
In order to realize the purpose, the utility model adopts the following technical scheme:
a liquid level measuring instrument comprises the fluid pressure measuring device.
The utility model has the advantages that:
the utility model provides a pair of fluid pressure measuring device, when measuring the liquid level, second joint Assembly and fluid intercommunication that awaits measuring fill compressed air into holding the intracavity through first joint Assembly, avoid the fluid that awaits measuring to enter into and hold the intracavity, fluid does not get into the second joint Assembly until awaiting measuring, compressed air does not spill over second joint Assembly simultaneously, at this moment, fluid's pressure that awaits measuring equals with the compressed air pressure that holds the intracavity, pressure sensor measures the pressure that holds the compressed air of intracavity, can obtain the fluid's pressure that awaits measuring. The fluid to be measured is isolated from the pressure sensor through compressed air, non-contact measurement is realized, the pressure sensor is prevented from directly contacting the fluid to be measured to influence the use of the pressure sensor, the reliability and the service life of the pressure sensor are improved, and the use cost is reduced; through the fluid that awaits measuring of second joint Assembly contact, can use the second joint Assembly of different materials according to the service environment of difference, can be applicable to the measurement of pressure under the different environment, application scope is wide.
The utility model provides a pair of liquid level measuring instrument through adopting foretell fluid pressure measuring device, utilizes data conversion to realize the liquid level test, and the measuring accuracy is high, stability is high, the reliability is high, reduces use cost.
Drawings
Fig. 1 is a schematic structural diagram of a fluid pressure measuring device according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of fig. 1.
In the figure:
1-a shell; 11-a containment chamber; 12-an opening; 2-a pressure sensor; 21-gauge pressure sensor body; 22-waterproof gas-guide tube; 3-a first joint assembly; 31-a first conduit fitting; 32-a first lock nut; 4-a second joint assembly; 41-a second conduit fitting; 42-a second lock nut; 5-a one-way valve; 6-a first seal; 7-a second seal; 8-a third seal; 9-pouring sealant; 10-a locking member; 20-outgoing cables.
Detailed Description
In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The embodiment provides a fluid pressure measuring device, which can be applied to industrial measurement, such as pressure measurement of accumulated water in dispensing cans, overpass tunnels and the like, further calculates water level based on the pressure, and is applied to the fields of coffee machines and other electrical products. As shown in fig. 1, the fluid pressure measuring apparatus includes a housing 1 and a first joint assembly 3 and a second joint assembly 4 coupled to the housing 1. Specifically, as shown in fig. 2, an accommodating cavity 11 for accommodating gas is formed in the housing 1, the accommodating cavity 11 is internally provided with the pressure sensor 2 in a sealing manner, one end of the first joint assembly 3 is communicated with the accommodating cavity 11, the other end of the first joint assembly is communicated with an external gas source, and compressed air can be filled into the accommodating cavity 11; one end of the second joint component 4 is communicated with the accommodating cavity 11, and the other end is communicated with the fluid to be measured; the pressure sensor 2 is used to measure the pressure of the compressed air in the accommodating chamber 11.
When the pressure of the fluid is measured, the second joint component 4 is communicated with the fluid to be measured, compressed air is filled into the accommodating cavity 11 through the first joint component 3, the fluid to be measured is prevented from entering the accommodating cavity until the fluid to be measured does not enter the second joint component 4, meanwhile, the compressed air does not overflow the second joint component 4, at the moment, the pressure of the fluid to be measured is equal to the pressure of the compressed air in the accommodating cavity 11, and the pressure sensor 2 measures the pressure of the compressed air in the accommodating cavity 11, so that the pressure of the fluid to be measured can be obtained. The fluid to be measured is isolated from the pressure sensor 2 through compressed air, non-contact measurement is realized, the pressure sensor 2 is prevented from being directly contacted with the fluid to be measured to influence the use of the pressure sensor 2, the reliability and the service life of the pressure sensor 2 are improved, and the use cost is reduced; through the fluid that awaits measuring of second joint Assembly 4 contact, can use the second joint Assembly 4 of different materials according to the service environment of difference, can be applicable to the measurement of pressure under the different environment, application scope is wide.
Optionally, still set up on casing 1 with hold opening 12 that chamber 11 communicates, pressure sensor 2 sets up on opening 12, the installation and the measurement of pressure sensor 2 of being convenient for, pressure sensor 2 sets up on opening 12 through casting glue 9, makes pressure sensor 2 seal installation in casing 1, avoids receiving external environment's steam to destroy and influence life.
Further optionally, a locking member 10 is disposed between the pressure sensor 2 and the housing 1, and the locking member 10 is used for locking the pressure sensor 2, so that the pressure sensor 2 is fixed on the housing 1, and the structure is stable and the reliability is high. In this embodiment, the pressure sensor 2 and the locking member 10 are both disposed in the housing 1 through the potting adhesive 9, and optionally, the housing 1 is made of a stainless steel material or an engineering plastic material.
Alternatively, the pressure sensor 2 may be any one of an absolute pressure sensor, a gauge pressure sensor, or a differential pressure sensor, and may implement pressure measurement of the compressed air in the accommodating chamber 11; in the embodiment, the pressure sensor 2 adopts a gauge pressure sensor, and the gauge pressure sensor can eliminate the influence caused by atmospheric pressure change in different regions and different time periods and eliminate the influence caused by atmospheric pressure change in different regions and different time periods, so that the pressure measurement data is more accurate and reliable; optionally, the gauge pressure sensor comprises a gauge pressure sensor body 21 and a waterproof air duct 22 connected to the gauge pressure sensor body 21, and the other end of the waterproof air duct 22 extends out of the potting adhesive 9; when the gauge pressure sensor is used for a long time, the inside may enter steam, the waterproof air duct 22 timely discharges the steam on the gauge pressure sensor body 21 to the outside, and meanwhile, the waterproof ventilation plug is arranged in the waterproof air duct 22, and the steam is prevented from entering the gauge pressure sensor body 21 through the waterproof air duct 22.
Optionally, the pressure measuring device includes a check valve 5 connected to the first joint component 3, so that external compressed air can be filled into the accommodating cavity 11, and the gas in the accommodating cavity 11 is blocked from overflowing from the first joint component 3, thereby avoiding leakage of the compressed air and improving accuracy of the pressure test. In addition, the one-way valve 5 is arranged, so that compressed air can be stably filled into the accommodating cavity 11, and the impact on the pressure sensor 2 is avoided. Optionally, the check valve 5 can be installed in the accommodating cavity 11, so that the integration of the pressure measuring device can be improved; alternatively, the check valve 5 may also be mounted outside the housing 1, facilitating the mounting of the check valve 5. In this embodiment, two check valves 5 are installed in the housing 1, so that the use reliability is improved, and the maintenance is reduced. In order to improve reliability and reduce maintenance, a plurality of check valves 5 may be installed in other embodiments.
Optionally, the one-way valve 5 is sealingly connected to the receiving chamber 11. Optionally, the one-way valve 5 is connected to the housing 1 by a third seal 8. As shown in fig. 2, in this embodiment, the third sealing element 8 is a sealing ring, and the sealing ring is installed between the periphery of the check valve 5 and the inner hole of the accommodating cavity 11, so that the check valve 5 and the accommodating cavity 11 are sealed, and the influence of air leakage on the measurement effect is avoided.
Optionally, the first connector assembly 3 comprises an air pipe for communicating the accommodating cavity 11 with an external air source; the second connector assembly 4 comprises a gas pipe for communicating the containing chamber 11 with the fluid to be measured. The air pipe has low cost, is convenient to replace and is convenient for later maintenance; the service life of the first joint component 3 and the second joint component 4 can be prolonged by respectively directly contacting the air pipe with an external air source and the fluid to be detected. Optionally, the gas tube is made of a corrosion resistant plastic material.
In this embodiment, the first connector assembly 3 includes a first conduit connector 31 connected to the housing 1 and a first lock nut 32 connected to the first conduit connector 31; the second connector assembly 4 includes a second conduit connector 41 attached to the housing 1 and a second lock nut 42 attached to the second conduit connector 41. Optionally, the first conduit connector 31 and the second conduit connector 41 are both connected to the housing 1 by threads, so that the assembly and disassembly are convenient. Optionally, an air pipe is installed through the first conduit connector 31, the air pump fills compressed air into the accommodating cavity 11 through the air pipe, and the first locking nut 32 locks the air pipe on the first conduit connector 31, so that the influence on use caused by unstable installation of the air pipe is avoided. Similarly, the second pipe joint 41 is provided with an air pipe, the air pipe is put into the fluid to be measured, and the second lock nut 42 locks the air pipe on the second pipe joint 41, so that the air pipe and the second pipe joint 41 are stably installed, and the use reliability is improved. Further optionally, the first joint component 3 and the second joint component 4 have the same specification and size, and can be replaced with each other, so that the assembly convenience is improved.
In other embodiments, the first joint component 3 and the second joint component 4 may be air pipe joints, one end of the air pipe joint is in threaded connection with the housing 1, the other end of the air pipe joint is inserted with an air pipe, and the air pipe joint is a standard component, so that the air pipe joint is convenient to use and low in cost. Optionally, the first joint assembly 3 is sealingly connected to the housing 1. Optionally, the first joint assembly 3 is connected to the housing 1 by a first seal 6. As shown in fig. 2, in the present embodiment, the first sealing member 6 is a sealing ring, a groove is provided on the first conduit joint 31, and the sealing ring is mounted in the groove and the other end of the sealing ring abuts against the housing 1, so that the first conduit joint 31 and the housing 1 are sealed.
Optionally, the second joint assembly 4 is sealingly connected to the housing 1. The second joint assembly 4 is connected to the housing 1 by a second seal 7. As shown in fig. 2, in the present embodiment, the second sealing element 7 is a sealing ring, and similarly, a groove is formed on the second conduit joint 41, the sealing ring is installed in the groove, and the other end of the sealing ring abuts against the housing 1, so that the second conduit joint 41 and the housing 1 are sealed. Alternatively, the first seal 6 and the second seal 7 may be used interchangeably as the first joint assembly 3 and the second joint assembly 4 are used interchangeably.
Optionally, the first joint component 3 and the second joint component 4 are respectively connected with the shell 1 through a sealant or a hydraulic adhesive tape, so that the sealing purpose is achieved, air leakage is prevented, and the measurement accuracy is improved; specifically, the first joint component 3 and the second joint component 4 are respectively in threaded connection with the housing 1, and the sealant or the hydraulic adhesive tape is arranged in the threaded connection.
The embodiment further provides a liquid level measuring instrument, which comprises the pressure measuring device, a measuring air chamber installed on the second joint component 4 and communicated with the fluid to be measured, an air source component communicated with the first joint component 3, and an output cable 20 electrically connected with the pressure sensor 2 and used for transmitting measurement data to the outside, wherein the fluid to be measured is the liquid to be measured in the embodiment.
During testing, the measuring air chamber is put into the liquid to be tested, compressed air is supplemented into the accommodating cavity 11 through the first joint component 3, the pressure sensor 2 measures the pressure of the compressed air in the accommodating cavity 11, and measured data are processed through data conversion, so that corresponding water level height data can be obtained.
Optionally, a temperature sensor is further installed in the accommodating cavity 11 to obtain the pressure of the fluid to be measured at different temperatures. Optionally, the temperature sensor is electrically connected to the output cable 20, and performs data compensation processing through a temperature compensation algorithm, so as to improve the test accuracy. Optionally, the pressure sensor 2 and the temperature sensor are electrically connected to the same circuit board, and during measurement, the temperature sensor and the pressure sensor 2 both transmit data to the outside, and perform compensation processing on the measurement result of the pressure sensor 2 according to different temperatures, so that pressure data compensation and calibration in different temperature environments are realized, consistency and reliability of pressure measurement data are ensured, and the measurement result is more accurate. Optionally, the output cable 20 is a 4pin signal cable with terminal connections for transmitting the pressure signal and the temperature signal.
Optionally, the fluid pressure measuring device further comprises a power supply module, which is used for providing a direct current stabilized voltage power supply for the pressure sensor 2 and the temperature sensor, and can realize overvoltage, overcurrent or overheating protection; optionally, the pressure measuring device further includes a data processing module, which processes and decodes the pressure signal measured by the pressure sensor 2, in this embodiment, the temperature signal detected by the temperature sensor is subjected to data compensation processing by a temperature compensation algorithm; optionally, the fluid pressure measuring device further comprises a data transmission module for latching the data processed by the data processing module and supporting a third-party device or an upper computer software instruction query function; the output signal may be in the form of a wired signal, and may be in the form of any UART signal such as IIC/232/485.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A fluid pressure measurement device, comprising:
the gas-filled compressor comprises a shell (1), wherein an accommodating cavity (11) for accommodating gas is formed in the shell;
one end of the first joint component (3) is communicated with the accommodating cavity (11), the other end of the first joint component is communicated with an external air source, and compressed air can be filled into the accommodating cavity (11);
one end of the second joint component (4) is communicated with the accommodating cavity (11), and the other end of the second joint component is communicated with the fluid to be measured;
the pressure sensor (2) is arranged in the accommodating cavity (11) in a sealing mode and used for measuring the pressure of the compressed air in the accommodating cavity (11).
2. Fluid pressure measuring device according to claim 1, characterized in that a temperature sensor is also mounted in the receiving chamber (11).
3. The fluid pressure measuring device according to claim 1, wherein the housing (1) further has an opening (12) communicating with the accommodating chamber (11), and the pressure sensor (2) is disposed on the opening (12) through a potting adhesive (9).
4. The fluid pressure measuring device according to claim 3, wherein the pressure sensor (2) comprises a gauge pressure sensor body (21) and a waterproof air duct (22) connected to the gauge pressure sensor body (21), the other end of the waterproof air duct (22) extends out of the potting adhesive (9), and a waterproof air-permeable plug is installed in the waterproof air duct (22).
5. Fluid pressure measuring device according to claim 1, characterized in that the pressure measuring device comprises a one-way valve (5) connected to the first joint assembly (3) for one-way charging of external compressed air into the receiving chamber (11).
6. Fluid pressure measuring device according to claim 5, characterized in that the non return valve (5) is arranged in the receiving chamber (11) and that the non return valve (5) is arranged sealed to the receiving chamber (11).
7. Fluid pressure measuring device according to any of claims 1-6, wherein the first joint assembly (3) is sealingly connected to the housing (1); and/or the second joint component (4) is connected with the shell (1) in a sealing way.
8. Fluid pressure measuring device according to claim 7, characterised in that the first joint component (3) is connected to the housing (1) by means of a sealing or hydraulic adhesive tape; and/or
The second joint assembly (4) is connected with the shell (1) through a sealant or a hydraulic adhesive tape.
9. Fluid pressure measuring device according to any of claims 1-6, wherein the first connector assembly (3) comprises a gas pipe for communicating the receiving chamber (11) with the external gas source; and/or
The second joint component (4) comprises an air pipe, and the air pipe is used for communicating the accommodating cavity (11) and the fluid to be measured.
10. A liquid level gauge comprising a fluid pressure measuring device according to any one of claims 1 to 9.
CN202021190548.4U 2020-04-03 2020-06-23 Fluid pressure measuring device and liquid level measuring instrument Active CN212158908U (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2020102611556 2020-04-03
CN202010261155.6A CN111289168A (en) 2020-04-03 2020-04-03 Pressure measuring device and liquid level measuring instrument

Publications (1)

Publication Number Publication Date
CN212158908U true CN212158908U (en) 2020-12-15

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Family Applications (5)

Application Number Title Priority Date Filing Date
CN202010261155.6A Withdrawn CN111289168A (en) 2020-04-03 2020-04-03 Pressure measuring device and liquid level measuring instrument
CN202021186687.XU Active CN212275130U (en) 2020-04-03 2020-06-23 Pressure measuring device and liquid level measuring instrument
CN202010583797.8A Pending CN111537134A (en) 2020-04-03 2020-06-23 Fluid pressure measuring device and liquid level measuring instrument
CN202021190548.4U Active CN212158908U (en) 2020-04-03 2020-06-23 Fluid pressure measuring device and liquid level measuring instrument
CN202021190508.XU Active CN212513441U (en) 2020-04-03 2020-06-23 Pressure measuring device and liquid level measuring instrument

Family Applications Before (3)

Application Number Title Priority Date Filing Date
CN202010261155.6A Withdrawn CN111289168A (en) 2020-04-03 2020-04-03 Pressure measuring device and liquid level measuring instrument
CN202021186687.XU Active CN212275130U (en) 2020-04-03 2020-06-23 Pressure measuring device and liquid level measuring instrument
CN202010583797.8A Pending CN111537134A (en) 2020-04-03 2020-06-23 Fluid pressure measuring device and liquid level measuring instrument

Family Applications After (1)

Application Number Title Priority Date Filing Date
CN202021190508.XU Active CN212513441U (en) 2020-04-03 2020-06-23 Pressure measuring device and liquid level measuring instrument

Country Status (1)

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Also Published As

Publication number Publication date
CN111289168A (en) 2020-06-16
CN212275130U (en) 2021-01-01
CN212513441U (en) 2021-02-09
CN111537134A (en) 2020-08-14

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