CN112213027A - Rapid calibrating device and calibrating method for pressure sensor - Google Patents

Rapid calibrating device and calibrating method for pressure sensor Download PDF

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Publication number
CN112213027A
CN112213027A CN202010938631.3A CN202010938631A CN112213027A CN 112213027 A CN112213027 A CN 112213027A CN 202010938631 A CN202010938631 A CN 202010938631A CN 112213027 A CN112213027 A CN 112213027A
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China
Prior art keywords
pressure
piston
cylinder body
pressure cavity
sensor
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CN202010938631.3A
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Chinese (zh)
Inventor
刘伟东
王继跃
秦鱼龙
宋津成
金浩
孙嘉兴
王泮震
申春宝
吴亚军
张革
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FAW Group Corp
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FAW Group Corp
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Priority to CN202010938631.3A priority Critical patent/CN112213027A/en
Publication of CN112213027A publication Critical patent/CN112213027A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure

Abstract

The invention discloses a rapid calibrating device and a rapid calibrating method for a pressure sensor, wherein the calibrating device comprises: the device comprises a bottom plate, a linear loader, a force sensor, a cylinder assembly, a pointer indicating component, a high-pressure cavity assembly and a standard pressure sensor; according to the detection precision needs, can install respectively to constitute and include: setting different detection modes including a standard pressure sensor, a force sensor, a pointer indicating component and the standard pressure sensor and the pointer indicating component, and setting detection methods respectively based on corresponding detection devices. The calibrating device and the calibrating method can rapidly calibrate the state and the precision of the pressure sensor, have low cost and simple operation, are easy to realize, and can select different levels of calibrating precision according to requirements.

Description

Rapid calibrating device and calibrating method for pressure sensor
Technical Field
The invention belongs to the technical field of pressure sensor detection, and particularly relates to a rapid pressure sensor calibrating device and a calibrating method.
Background
The pressure sensor is widely used in the bench test of the automatic transmission of the automobile, such as a DCT (discrete cosine transformation) transmission, and can be used for testing the oil pressure of a hydraulic system. The state and accuracy of the pressure sensor are very important and directly influence the test result.
During the use of bench tests, there are several problems affecting the state and accuracy of the sensor:
1) one pressure sensor is frequently required to be repeatedly used, and is applied to different occasions, and the sensor is required to be disassembled and assembled for many times, so that the sensor is easily damaged or the precision is easily deteriorated in the process;
2) the pressure sensor is generally used in a severe environment in a transmission bench test, and a circuit is easy to age due to high temperature and high cold and is soaked in oil products;
3) the space is narrow and small, and the circuit often need bend, probably contact failure appears in the long-term use.
Based on the reasons, the pressure sensor needs to be calibrated before being used, so that the accuracy of test data is ensured, and the test progress is prevented from being repeatedly influenced by the test.
The pressure sensor detection equipment on the market is generally expensive, is suitable for special verification mechanisms, and has low relative utilization rate in a laboratory.
In the prior art, in the technical scheme aiming at the pressure sensor calibration, the calibration device has the advantages of complex structure, time-consuming construction, high cost, high operation difficulty in the calibration process and difficult mastering.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a rapid calibrating device and a calibrating method for a pressure sensor, which can rapidly calibrate the state and the precision of the pressure sensor. The technical scheme of the invention is as follows by combining the attached drawings of the specification:
a pressure sensor rapid verification apparatus, comprising: the device comprises a bottom plate 1, a linear loader 2, a cylinder assembly 4, a high-pressure cavity assembly 5 and a standard pressure sensor 14;
the linear loader 2 is fixed at one end of the bottom plate 1;
the piston 6 of the cylinder assembly 4 is coaxially and fixedly connected with the linear displacement output end of the linear loader 2;
the high-pressure cavity assembly 5 consists of a high-pressure cavity 13, a sealing plug 16 and an air valve 17, wherein an air port at the front end of the high-pressure cavity 13 is communicated with the cylinder body 7 of the cylinder assembly 4, a plurality of sensor mounting ports are formed in the top of the high-pressure cavity 13, the air valve 17 is mounted at an air port on the side surface of the high-pressure cavity 13, and the air port on the high-pressure cavity 13 is communicated with the mounting ports;
the standard pressure sensor 14 and the measured pressure sensor 15 are respectively installed at a sensor installation port at the top of the high-pressure cavity 13, and a sensor port without a sensor is sealed by a sealing plug 16, so that the high-pressure cavity 13 after installation and connection is a sealed cavity.
A pressure sensor rapid calibration method adopts the pressure sensor rapid calibration device, and the pressure sensor rapid calibration method comprises the following specific processes:
a1: the air valve 17 is opened, and the piston 6 of the cylinder assembly 4 is driven to drive the piston head to move to the cylinder body opening of the cylinder body 7 of the cylinder assembly 4 by controlling the linear loader 2 to act;
a2: the air valve 17 is closed, the linear loader 2 is controlled to act, the piston 6 is driven to drive the piston head to start to move towards the direction of the bottom of the cylinder body 7, so that the air at the rear end in the cylinder body 7 is pressed into the high-pressure cavity 13 through the piston 6, and a certain pressure is generated in the high-pressure cavity 13;
a3: since the inner pore passages of the high-pressure cavity 13 are communicated with each other, the pressure in the high-pressure cavity 13 is equal everywhere, and the pressure value detected by the standard pressure sensor 14 is read as a reference value, so that the detected pressure sensor 15 can be verified.
Another pressure sensor rapid verification apparatus, comprising: the device comprises a bottom plate 1, a linear loader 2, a force sensor 3, a cylinder assembly 4 and a high-pressure cavity assembly 5;
the linear loader 2 is fixed at one end of the bottom plate 1;
one end of the force sensor 3 is fixedly connected with the linear displacement output end of the linear loader 2, and the other end of the force sensor is fixedly connected with a piston 6 of the cylinder assembly 4;
the high-pressure cavity assembly 5 is composed of a high-pressure cavity 13, a sealing plug 16 and an air valve 17, wherein an air port at the front end of the high-pressure cavity 13 is communicated with the cylinder body 7 of the cylinder assembly 4, a plurality of sensor mounting ports are formed in the top of the high-pressure cavity 13, the air valve 17 is mounted at an air port on the side face of the high-pressure cavity 13, and the air port on the high-pressure cavity 13 is communicated with the mounting ports.
The pressure sensor 15 to be measured is arranged at the sensor mounting opening at the top of the high-pressure cavity 13, and the sensor opening without the sensor is sealed by a sealing plug 16, so that the high-pressure cavity 13 after being mounted and connected is a sealed cavity.
The other pressure sensor rapid calibrating method adopts the pressure sensor rapid calibrating device, and the pressure sensor rapid calibrating method comprises the following specific processes:
b1: the air valve 17 is opened, and the piston 6 of the driving cylinder assembly 4 drives the piston head to move to the cylinder body opening of the cylinder body 7 by controlling the linear loader 2 to act;
b2: by controlling the action of the linear loader 2, the piston 6 of the driving cylinder assembly 4 drives the piston head to slowly move towards the bottom of the cylinder body 7 at a constant speed, and the detected pressure value of the force sensor 3 is recorded, wherein the value is the force acted on the piston 6 by the linear loader 2 at the moment and is also the friction force f between the inner wall of the cylinder body 7 of the cylinder assembly 4 and the piston head of the piston 6;
b3: by controlling the action of the linear loader 2, a piston 6 of the driving cylinder assembly 4 drives a piston head to move to a cylinder body opening of a cylinder body 7;
b4: closing the air valve 17, driving the piston 6 to drive the piston head to start to linearly move towards the bottom of the cylinder body 7 by controlling the action of the linear loader 2 so as to press the gas at the rear end in the cylinder body 7 into the high-pressure cavity 13 through the piston 6, so that a certain pressure P is generated in the high-pressure cavity 13, and recording a pressure value F detected by the force sensor 3 at the moment;
b5: the accurate pressure in the cylinder block 7, namely the pressure in the high-pressure cavity 13, is calculated by the following formula, and the pressure sensor 15 to be measured is verified by the pressure in the high-pressure cavity 13:
P＝(F-f)×S；
in the above formula:
p is the pressure in the high-pressure cavity;
f is the pressure value detected by the sensor and is also the pressure value in the cylinder body;
f is the friction force between the inner wall of the cylinder body and the piston head of the piston;
and S is the cross-sectional area of the inner cavity of the cylinder block, namely the radial cross-sectional area of the piston head, and can be known according to a measured or designed value.
Still another pressure sensor rapid verification apparatus, comprising: the device comprises a bottom plate 1, a linear loader 2, a cylinder assembly 4, a pointer indicating component and a high pressure cavity assembly 5;
the linear loader 2 is fixed at one end of the bottom plate 1;
the piston 6 of the cylinder assembly 4 is coaxially and fixedly connected with the linear displacement output end of the linear loader 2;
the pointer indicating assembly is arranged on the cylinder assembly 4 and consists of a pointer 11, a bolt 12 and linear scales; the linear scale is engraved on the outer side wall of the piston rod along the axial direction of the piston 6, the pointer 11 points to the linear distance scale of the outer side wall of the piston rod, and the distance of the piston 6 moving along the axial direction is obtained by reading the scale value of the pointer 11 pointing to the linear distance scale;
the high-pressure cavity assembly 5 consists of a high-pressure cavity 13, a sealing plug 16 and an air valve 17, wherein an air port at the front end of the high-pressure cavity 13 is communicated with the cylinder body 7 of the cylinder assembly 4, a plurality of sensor mounting ports are formed in the top of the high-pressure cavity 13, the air valve 17 is mounted at an air port on the side surface of the high-pressure cavity 13, and the air port on the high-pressure cavity 13 is communicated with the mounting ports;
the pressure sensor 15 to be measured is arranged at the sensor mounting opening at the top of the high-pressure cavity 13, and the sensor opening without the sensor is sealed by a sealing plug 16, so that the high-pressure cavity 13 after being mounted and connected is a sealed cavity.
The pressure sensor rapid calibrating method adopts the pressure sensor rapid calibrating device, and comprises the following specific processes:
c1: in a constant temperature environment, the air valve 17 is opened, and the piston 6 of the cylinder assembly 4 is driven to drive the piston head to move to the cylinder body opening of the cylinder body 7 of the cylinder assembly 4 by controlling the linear loader 2 to act;
c2: the air valve 17 is closed, the linear loader 2 is controlled to act, the piston 6 is driven to drive the piston head to start to move towards the direction of the bottom of the cylinder body 7, so that the air at the rear end in the cylinder body 7 is pressed into the high-pressure cavity 13 through the piston 6, and a certain pressure is generated in the high-pressure cavity 13;
c3: reading the indication scale value of the pointer 11 on the piston rod of the piston 6, calculating to obtain the accurate pressure in the high-pressure cavity 13 through the following formula, and calibrating the pressure sensor 15 to be measured through the pressure in the high-pressure cavity 13:
P0×(S×L0+V2)＝P1·(S×L1+V2)
in the above formula:
P0is at atmospheric pressure;
s is the cross-sectional area of the inner cavity of the cylinder block, namely the radial cross-sectional area of the piston head, and can be known according to a measured or designed value;
L0the length of an inner cavity of the cylinder body when the piston head is at a left limit position, namely the axial distance between the outer end surface of the piston head and the inner bottom surface of the cylinder body when the piston head is at the position of a cylinder body opening of the cylinder body 7;
V2is the inner hole and the height of the high pressure cavityThe total volume of the connecting part of the pressure cavity and the cylinder body;
P1is the pressure in the high-pressure cavity;
L1is the pressure in the high-pressure cavity is P1When the pressure is higher than the pressure in the high-pressure cavity, the length of the inner cavity of the corresponding cylinder body is equal to the pressure in the high-pressure cavity1The axial distance between the outer end face of the piston head and the inner bottom face of the cylinder body is obtained by reading the indication scale value of the pointer on the piston rod of the piston.
There is also a rapid calibrating apparatus for a pressure sensor, comprising: the device comprises a bottom plate 1, a linear loader 2, a cylinder assembly 4, a pointer indicating component high-pressure cavity assembly 5 and a standard pressure sensor 14;
the linear loader 2 is fixed at one end of the bottom plate 1;
the piston 6 of the cylinder assembly 4 is coaxially and fixedly connected with the linear displacement output end of the linear loader 2;
the pointer indicating assembly is arranged on the cylinder assembly 4 and consists of a pointer 11, a bolt 12 and linear scales; the linear scale is engraved on the outer side wall of the piston rod along the axial direction of the piston 6, the pointer 11 points to the linear distance scale of the outer side wall of the piston rod, and the distance of the piston 6 moving along the axial direction is obtained by reading the scale value of the pointer 11 pointing to the linear distance scale;
the high-pressure cavity assembly 5 consists of a high-pressure cavity 13, a sealing plug 16 and an air valve 17, wherein an air port at the front end of the high-pressure cavity 13 is communicated with the cylinder body 7 of the cylinder assembly 4, a plurality of sensor mounting ports are formed in the top of the high-pressure cavity 13, the air valve 17 is mounted at an air port on the side surface of the high-pressure cavity 13, and the air port on the high-pressure cavity 13 is communicated with the mounting ports;
the standard pressure sensor 14 and the measured pressure sensor 15 are respectively installed at a sensor installation port at the top of the high-pressure cavity 13, and a sensor port without a sensor is sealed by a sealing plug 16, so that the high-pressure cavity 13 after installation and connection is a sealed cavity.
The pressure sensor rapid calibrating device is adopted, and the pressure sensor rapid calibrating method comprises the following specific processes:
d1: in a constant temperature environment, a standard pressure sensor 14 is arranged on a sensor mounting port of a high-pressure cavity 13, an air valve 17 on a high-pressure cavity assembly 5 is opened, and a piston 6 of a driving cylinder assembly 4 drives a piston head to move to a cylinder body port position of a cylinder body 7 by controlling the action of a linear loader 2;
d2: closing the air valve 17, and driving the piston 6 of the driving cylinder assembly 4 to drive the piston head to move from the position of the cylinder body opening of the cylinder body 7 to the position of the bottom of the cylinder body by controlling the action of the linear loader 2 so as to generate certain pressure intensity inside the high-pressure cavity 13;
d3: along with the movement of the piston head driven by the piston 6, according to the pressure value in the pressure cavity 13 detected and read by the standard pressure sensor 14, on the basis of the relation between the linear displacement of the piston 6 and the pressure detected by the standard pressure sensor 14, forming a corresponding pressure scale on the outer wall of the piston rod of the piston 6 along the axial direction;
d4: the standard pressure sensor 14 is detached, and the pressure sensor 15 to be measured is replaced and installed on the sensor installation opening of the high-pressure cavity 13;
d5: an air valve 17 on the high-pressure cavity assembly 5 is opened, and a piston 6 of a driving cylinder assembly 4 drives a piston head to move to a cylinder body opening position of a cylinder body 7 by controlling the action of the linear loader 2;
d6: the air valve 17 is closed, the linear loader 2 is controlled to act, the piston 6 is driven to drive the piston head to start to linearly move towards the bottom of the cylinder body 7, so that the air at the rear end in the cylinder body 7 is pressed into the high-pressure cavity 13 through the piston 6, and a certain pressure is generated in the high-pressure cavity 13;
d7: the pressure scale value indicated by the pointer 11 on the piston rod of the piston 6 is read to verify the measured pressure sensor 15.
Further, in the above fast calibration apparatus for a pressure sensor, the linear loader 2 is composed of a loader housing 18, a loading handle 19, a loading gear 20 and a loading rack 21;
the loader shell 18 is fixedly installed on the bottom plate 1 through bolts, the loading rack 21 is horizontally arranged and installed in the loader shell 18, the loading gear 20 is in meshed transmission connection with the loading rack 21, a rotating shaft of the loading handle 19 is coaxially and fixedly connected with the loading gear 20, and the loading gear 20 drives the loading rack 21 to horizontally and linearly move under the rotation driving of the loading handle 19, so that linear loading is realized.
Further, in the device for quickly calibrating the pressure sensor, the cylinder assembly 4 is composed of a piston 6, a cylinder body 7, a clamping ring 8, a guide block 9 and an O-ring 10, wherein the piston 6 is composed of a piston rod and a piston head which are coaxially and fixedly connected;
a piston rod of the piston 6 extends out of a cylinder body opening at the front end of the cylinder body 7 and is fixedly connected with a front end part, and a piston head of the piston 6 is in sealing fit connection with the inner side wall of the cylinder body through two groups of coaxial and parallel O-shaped rings 10;
the guide block 9 is coaxially fixed on a piston rod of the piston 6, the outer side wall of the guide block 9 is matched and connected with the inner side wall of the cylinder body 7, and a plurality of through holes are formed in the end face of the guide block 9;
the clamping ring 8 is coaxially fixed on the inner side of a cylinder body opening at the front end of the cylinder body 7, so that the guide block 9 is axially limited;
and the bottom of the cylinder body at the rear end of the cylinder body 7 is provided with an air outlet, and is in threaded sealing connection with the air inlet end of the high-pressure cavity assembly 5.
Compared with the prior art, the invention has the beneficial effects that:
the rapid calibrating device and the calibrating method for the pressure sensor can rapidly calibrate the state and the precision of the pressure sensor, have low cost and simple operation, are easy to realize, and can select calibrating precision of different levels according to requirements.
Drawings
FIG. 1 is a schematic perspective view of a rapid calibration device for a pressure sensor according to the present invention;
FIG. 2 is a schematic structural diagram of a linear loader in the rapid calibration apparatus for a pressure sensor according to the present invention;
FIG. 3 is a schematic perspective view of a cylinder assembly of the rapid calibration apparatus for a pressure sensor according to the present invention;
FIG. 4a is a schematic front perspective view of a high pressure chamber assembly in the rapid calibration apparatus for a pressure sensor according to the present invention;
FIG. 4b is a schematic front perspective view of a high pressure chamber assembly in the rapid calibration apparatus for a pressure sensor according to the present invention;
FIG. 5 is a schematic perspective view of a high pressure chamber in the rapid calibration apparatus for a pressure sensor according to the present invention;
FIG. 6 is a schematic perspective view of an exemplary rapid calibration apparatus for a pressure sensor according to the present invention;
FIG. 7 is a schematic perspective view of an exemplary second embodiment of the rapid calibration apparatus for pressure sensors according to the present invention;
FIG. 8 is a schematic diagram of an exemplary three-dimensional structure of the rapid calibration apparatus for a pressure sensor according to the present invention;
in the figure:
1-a bottom plate, 2-a linear loader, 3-a force sensor,
4-cylinder assembly, 5-high pressure cavity assembly, 6-piston,
7-cylinder body, 8-snap ring, 9-guide block,
10-O-ring, 11-pointer, 12-bolt,
13-high pressure cavity, 14-standard pressure sensor, 15-measured pressure sensor,
16-sealing plug, 17-air valve, 18-loader housing,
19-loading handle, 20-loading gear and 21-loading rack.
Detailed Description
For clearly and completely describing the technical scheme and the specific working process thereof, the specific implementation mode of the invention is as follows by combining the attached drawings of the specification:
in the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The first embodiment is as follows: (setting Standard pressure sensor)
In this embodiment, a pressure sensor rapid calibration apparatus is disclosed, as shown in fig. 6, the pressure sensor rapid calibration apparatus includes: the device comprises a bottom plate 1, a linear loader 2, a cylinder assembly 4, a high-pressure cavity assembly 5 and a standard pressure sensor 14.
The bottom plate 1 is of a flat steel plate structure, and a plurality of threaded connecting holes are formed in the horizontal surface of the bottom plate and used for installing and fixing other components;
the linear loader 2 is of a gear rack structure, can provide linear displacement and force, and is connected and fastened with the bottom plate 1 through bolts; as shown in fig. 2, the linear loader 2 is composed of a loader housing 18, a loading handle 19, a loading gear 20 and a loading rack 21, wherein the loader housing 18 is fixedly mounted on the bottom plate 1 through bolts, the loading rack 21 is horizontally arranged and mounted in the loader housing 18, the loading gear 20 is in meshing transmission connection with the loading rack 21, a rotating shaft of the loading handle 19 is coaxially and fixedly connected with the loading gear 20, and the loading gear 20 drives the loading rack 21 to horizontally and linearly move under the rotation driving of the loading handle 19, so as to realize linear loading.
The cylinder assembly 4 adopts a piston type cylinder structure and is used for converting linear force generated and output by the linear loader 2 into pressure of a closed cavity; as shown in fig. 3, the cylinder assembly 4 includes: the piston comprises a piston 6, a cylinder body 7, a clamping ring 8, a guide block 9 and an O-shaped ring 10, wherein the piston 6 is formed by coaxially and fixedly connecting a piston rod and a piston head;
the piston 6 is arranged on the inner side of the cylinder body 7, a piston rod of the piston 6 extends out of a cylinder body opening at the front end of the cylinder body 7 and is coaxially and fixedly connected with the linear displacement output end of the linear loader 2, a piston head of the piston 6 is in sealing fit connection with the inner side wall of the cylinder body through two groups of O-shaped rings 10 which are coaxially arranged in parallel, cylinder inner cavities at the front end and the rear end of the piston head in the axial direction are mutually sealed and isolated, and the piston rod drives the piston head to linearly reciprocate in the cylinder body 7 in the axial direction under the driving of the linear loader;
the guide block 9 is coaxially fixed on a piston rod of the piston 6, the outer side wall of the guide block 9 is matched and connected with the inner side wall of the cylinder body 7, and a plurality of through holes are formed in the end face of the guide block 9, so that the piston rod drives the piston head to axially and stably reciprocate along the cylinder body under the guidance of the guide block 9;
the clamping ring 8 is coaxially fixed on the inner side of a cylinder body opening at the front end of the cylinder body 7 and used for axially limiting the guide block 9 and preventing the guide block 9 from sliding out of the cylinder body 7;
the air cylinder is characterized in that an air outlet is formed in the bottom of the air cylinder body at the rear end of the air cylinder body 7, external threads are formed in the outer side of the circumference of the rear end of the air cylinder body 7 and are in threaded sealing connection with the air inlet end of the high-pressure cavity assembly 5, and the inner cavity of the air cylinder body 7 is communicated with the high-pressure cavity assembly 5 through the air outlet.
As shown in fig. 4a and 4b, the high pressure chamber assembly 5 includes: a high pressure chamber 13, a sealing plug 16 and an air valve 17;
as shown in fig. 5, a high-pressure cavity mounting seat is arranged at the bottom of the high-pressure cavity 13, the high-pressure cavity mounting seat is fixedly mounted on the bottom plate 1 through a bolt, a high-pressure cavity air inlet is formed in the middle of the front end face of the high-pressure cavity 13, the high-pressure cavity air inlet is butted with an air outlet of the cylinder block 7, and the cylinder block 7 is communicated with the high-pressure cavity 13; the top of the high-pressure cavity 13 is provided with only two sensor mounting ports, in the first embodiment, the number of the sensor mounting ports is three, one of the three sensor mounting ports is provided with a standard pressure sensor 14, and the rest two sensor mounting ports can be provided with one or more tested pressure sensors 15 according to actual conditions; air ports are formed in the left side surface and the right side surface of the high-pressure cavity 13, and the air ports are formed in the rear end surface of the high-pressure cavity 13 and the sensor mounting ports on the top surface in a one-to-one correspondence mode;
the air inlet on the front end surface of the high-pressure cavity 13, the air ports on the left side surface and the right side surface of the high-pressure cavity 13, the air ports on the rear end surface of the high-pressure cavity 13 and the sensor mounting port on the top of the high-pressure cavity 13 are communicated with each other through pore channels;
the air valve 17 is in threaded connection with an air port on one side surface of the high-pressure cavity 13;
the gas ports which are not connected and used on the high-pressure cavity 13 are connected with the sealing plug through threads and are sealed through an O-shaped ring or a sealing gasket, so that the gas ports are blocked;
when the air valve 17 is opened, the high-pressure cavity 13 is communicated with the outside atmosphere, and when the air valve 17 is closed, the inner pore passage of the high-pressure cavity 13 is a closed cavity.
In the first embodiment, the internal volumes of the cylinder block 7 and the high-pressure cavity 13 should satisfy: when the piston head of the piston 6 moves from the left limit position (i.e., the limit position at the cylinder port) to the right limit position (i.e., the limit position at the cylinder bottom), the air volume inside the cylinder block 7 and the high-pressure chamber 13 is compressed by more than 20 times.
Example two: (verification by Standard pressure sensor)
The second embodiment discloses a pressure sensor rapid calibration method, which is based on the pressure sensor rapid calibration device described in the first embodiment, and as shown in fig. 6, the specific process is as follows:
a1: an air valve 17 on the high-pressure cavity assembly 5 is opened, and the piston 6 of the driving cylinder assembly 4 drives the piston head to move to a left limit position, namely to the cylinder body opening of the cylinder body 7 of the cylinder assembly 4 by controlling the action of the linear loader 2;
a2: the air valve 17 is closed, the linear loader 2 is controlled to act, the piston 6 is driven to drive the piston head to start to move linearly to the right, namely to move towards the bottom of the cylinder body 7, so that the air at the rear end in the cylinder body 7 is pressed into the high-pressure cavity 13 through the piston 6, and a certain pressure is generated in the high-pressure cavity 13;
a3: since the inner pore passages of the high-pressure cavity 13 are communicated with each other, the pressure in the high-pressure cavity 13 is equal everywhere, and the pressure value detected by the standard pressure sensor 14 is read as a reference value, so that the detected pressure sensor 15 can be detected;
during the verification process, when the piston head of the piston 6 moves from the left limit position to the right limit position, the air volume inside the cylinder block 7 and the high-pressure chamber 13 is compressed by more than 20 times.
The calibration method of the second embodiment can calibrate the measurement range as follows: 0-2 Mpa, precision: a 0.3% pressure sensor.
Example three: (setting force sensor)
In a third embodiment, a pressure sensor rapid calibration apparatus is disclosed, as shown in fig. 7, the pressure sensor rapid calibration apparatus includes: the device comprises a bottom plate 1, a linear loader 2, a force sensor 3, a cylinder assembly 4 and a high-pressure cavity assembly 5.
The bottom plate 1 is of a flat steel plate structure, and a plurality of threaded connecting holes are formed in the horizontal surface of the bottom plate and used for installing and fixing other components;
the linear loader 2 is of a gear rack structure, can provide linear displacement and force, and is connected and fastened with the bottom plate 1 through bolts; as shown in fig. 2, the linear loader 2 is composed of a loader housing 18, a loading handle 19, a loading gear 20 and a loading rack 21, wherein the loader housing 18 is fixedly mounted on the bottom plate 1 through bolts, the loading rack 21 is horizontally arranged and mounted in the loader housing 18, the loading gear 20 is in meshing transmission connection with the loading rack 21, a rotating shaft of the loading handle 19 is coaxially and fixedly connected with the loading gear 20, and the loading gear 20 drives the loading rack 21 to horizontally and linearly move under the rotation driving of the loading handle 19, so as to realize linear loading.
The force sensor 3 is a high-precision force sensor which is detected, one end of the force sensor 3 is fixedly connected with the linear displacement output end of the linear loader 2 through coaxial threads, and the other end of the force sensor 3 is connected with the cylinder assembly 4.
The cylinder assembly 4 adopts a piston type cylinder structure and is used for converting linear force generated and output by the linear loader 2 into pressure of a closed cavity; as shown in fig. 3, the cylinder assembly 4 includes: the piston comprises a piston 6, a cylinder body 7, a clamping ring 8, a guide block 9 and an O-shaped ring 10, wherein the piston 6 is formed by coaxially and fixedly connecting a piston rod and a piston head;
the piston 6 is arranged on the inner side of the cylinder body 7, a piston rod of the piston 6 extends out of a cylinder body opening at the front end of the cylinder body 7 and is fixedly connected with the force sensor 3 through coaxial threads, a piston head of the piston 6 is in sealing fit connection with the inner side wall of the cylinder body through two groups of O-shaped rings 10 which are coaxially arranged in parallel, cylinder inner cavities at the front end and the rear end of the piston head in the axial direction are mutually sealed and isolated, and the piston rod drives the piston head to linearly reciprocate in the cylinder body 7 in the axial direction under the driving of the linear loader 2;
the guide block 9 is coaxially fixed on a piston rod of the piston 6, the outer side wall of the guide block 9 is matched and connected with the inner side wall of the cylinder body 7, and a plurality of through holes are formed in the end face of the guide block 9, so that the piston rod drives the piston head to axially and stably reciprocate along the cylinder body under the guidance of the guide block 9;
the clamping ring 8 is coaxially fixed on the inner side of a cylinder body opening at the front end of the cylinder body 7 and used for axially limiting the guide block 9 and preventing the guide block 9 from sliding out of the cylinder body 7;
the air cylinder is characterized in that an air outlet is formed in the bottom of the air cylinder body at the rear end of the air cylinder body 7, external threads are formed in the outer side of the circumference of the rear end of the air cylinder body 7 and are in threaded sealing connection with the air inlet end of the high-pressure cavity assembly 5, and the inner cavity of the air cylinder body 7 is communicated with the high-pressure cavity assembly 5 through the air outlet.
As shown in fig. 4a and 4b, the high pressure chamber assembly 5 includes: a high pressure chamber 13, a sealing plug 16 and an air valve 17;
as shown in fig. 5, a high-pressure cavity mounting seat is arranged at the bottom of the high-pressure cavity 13, the high-pressure cavity mounting seat is fixedly mounted on the bottom plate 1 through a bolt, a high-pressure cavity air inlet is formed in the middle of the front end face of the high-pressure cavity 13, the high-pressure cavity air inlet is butted with an air outlet of the cylinder block 7, and the cylinder block 7 is communicated with the high-pressure cavity 13; the top of the high-pressure cavity 13 is provided with three sensor mounting ports, the number of the sensor mounting ports is set according to actual needs, and the pressure sensors 15 to be measured are mounted in the sensor mounting ports; air ports are formed in the left side surface and the right side surface of the high-pressure cavity 13, and the air ports are formed in the rear end surface of the high-pressure cavity 13 and the sensor mounting ports on the top surface in a one-to-one correspondence mode;
the air inlet on the front end surface of the high-pressure cavity 13, the air ports on the left side surface and the right side surface of the high-pressure cavity 13, the air ports on the rear end surface of the high-pressure cavity 13 and the sensor mounting port on the top of the high-pressure cavity 13 are communicated with each other through pore channels;
the air valve 17 is in threaded connection with an air port on one side surface of the high-pressure cavity 13;
the gas ports which are not connected and used on the high-pressure cavity 13 are connected with the sealing plug through threads and are sealed through an O-shaped ring or a sealing gasket, so that the gas ports are blocked;
when the air valve 17 is opened, the high-pressure cavity 13 is communicated with the outside atmosphere, and when the air valve 17 is closed, the inner pore passage of the high-pressure cavity 13 is a closed cavity.
Example four: (verification by force sensor)
The fourth embodiment discloses a pressure sensor rapid calibration method, which is based on the pressure sensor rapid calibration device described in the third embodiment, and as shown in fig. 7, the specific process is as follows:
b1: an air valve 17 on the high-pressure cavity assembly 5 is opened, and a piston 6 of a driving cylinder assembly 4 drives a piston head to move to a left limit position (at a cylinder body opening of a cylinder body 7) by controlling the action of the linear loader 2;
b2: by controlling the action of the linear loader 2, the piston 6 of the driving cylinder assembly 4 drives the piston head to slowly move at a uniform speed from the left limit position to the right limit position (the bottom of the cylinder body 7), and the detected pressure value of the force sensor 3 at the moment is recorded, namely the force acted on the piston 6 by the linear loader 2 at the moment and also the friction force f between the inner wall of the cylinder body 7 of the cylinder assembly 4 and the piston head of the piston 6;
b3: by controlling the action of the linear loader 2, a piston 6 of the driving cylinder assembly 4 drives a piston head to move to a left limit position;
b4: closing the air valve 17, driving the piston 6 to drive the piston head to start to move linearly to the right by controlling the action of the linear loader 2, namely moving towards the bottom of the cylinder body 7, so that the air at the rear end in the cylinder body 7 is pressed into the high-pressure cavity 13 through the piston 6, a certain pressure P is generated in the high-pressure cavity 13, and the pressure value F detected by the force sensor 3 at the moment is recorded;
b5: the accurate pressure in the cylinder block 7, namely the pressure in the high-pressure cavity 13, is calculated by the following formula, and the pressure sensor 15 to be measured is verified by the pressure in the high-pressure cavity 13:
P＝(F-f)×S；
in the above formula:
p is the pressure in the high-pressure cavity;
f is the pressure value detected by the sensor and is also the pressure value in the cylinder body;
f is the friction force between the inner wall of the cylinder body and the piston head of the piston;
s is the cross-sectional area of the inner cavity of the cylinder block, namely the radial cross-sectional area of the piston head, and can be known according to a measured or designed value;
the verification method of the fourth embodiment can verify the measuring range as follows: 0-2 Mpa, precision: a pressure sensor of + -1%.
Example five: (setting pointer indicating component)
This embodiment fifthly discloses a quick calibrating installation of pressure sensor, as shown in fig. 8, the quick calibrating installation of pressure sensor includes: the device comprises a bottom plate 1, a linear loader 2, a cylinder assembly 4, a pointer indicating component and a high pressure cavity assembly 5.
The bottom plate 1 is of a flat steel plate structure, and a plurality of threaded connecting holes are formed in the horizontal surface of the bottom plate and used for installing and fixing other components;
the linear loader 2 is of a gear rack structure, can provide linear displacement and force, and is connected and fastened with the bottom plate 1 through bolts; as shown in fig. 2, the linear loader 2 is composed of a loader housing 18, a loading handle 19, a loading gear 20 and a loading rack 21, wherein the loader housing 18 is fixedly mounted on the bottom plate 1 through bolts, the loading rack 21 is horizontally arranged and mounted in the loader housing 18, the loading gear 20 is in meshing transmission connection with the loading rack 21, a rotating shaft of the loading handle 19 is coaxially and fixedly connected with the loading gear 20, and the loading gear 20 drives the loading rack 21 to horizontally and linearly move under the rotation driving of the loading handle 19, so as to realize linear loading.
The cylinder assembly 4 adopts a piston type cylinder structure and is used for converting linear force generated and output by the linear loader 2 into pressure of a closed cavity; as shown in fig. 3, the cylinder assembly 4 includes: the piston comprises a piston 6, a cylinder body 7, a clamping ring 8, a guide block 9 and an O-shaped ring 10, wherein the piston 6 is formed by coaxially and fixedly connecting a piston rod and a piston head;
the piston 6 is arranged on the inner side of the cylinder body 7, a piston rod of the piston 6 extends out of a cylinder body opening at the front end of the cylinder body 7 and is coaxially and fixedly connected with the linear displacement output end of the linear loader 2, a piston head of the piston 6 is in sealing fit connection with the inner side wall of the cylinder body through two groups of O-shaped rings 10 which are coaxially arranged in parallel, cylinder inner cavities at the front end and the rear end of the piston head in the axial direction are mutually sealed and isolated, and the piston rod drives the piston head to linearly reciprocate in the cylinder body 7 in the axial direction under the driving of the linear loader;
the guide block 9 is coaxially fixed on a piston rod of the piston 6, the outer side wall of the guide block 9 is matched and connected with the inner side wall of the cylinder body 7, and a plurality of through holes are formed in the end face of the guide block 9, so that the piston rod drives the piston head to axially and stably reciprocate along the cylinder body under the guidance of the guide block 9;
the clamping ring 8 is coaxially fixed on the inner side of a cylinder body opening at the front end of the cylinder body 7 and used for axially limiting the guide block 9 and preventing the guide block 9 from sliding out of the cylinder body 7;
the air cylinder is characterized in that an air outlet is formed in the bottom of the air cylinder body at the rear end of the air cylinder body 7, external threads are formed in the outer side of the circumference of the rear end of the air cylinder body 7 and are in threaded sealing connection with the air inlet end of the high-pressure cavity assembly 5, and the inner cavity of the air cylinder body 7 is communicated with the high-pressure cavity assembly 5 through the air outlet.
The pointer indicating assembly is arranged on the cylinder assembly 4 and consists of a pointer 11, a bolt 12 and a linear scale as shown in fig. 3; the linear scale is engraved on the outer side wall of the piston rod along the axial direction of the piston 6, the pointer 11 points to the linear distance scale of the outer side wall of the piston rod, and the distance of the piston 6 moving along the axial direction is obtained by reading the scale value of the pointer 11 pointing to the linear distance scale;
as shown in fig. 4a and 4b, the high pressure chamber assembly 5 includes: a high pressure chamber 13, a sealing plug 16 and an air valve 17;
as shown in fig. 5, a high-pressure cavity mounting seat is arranged at the bottom of the high-pressure cavity 13, the high-pressure cavity mounting seat is fixedly mounted on the bottom plate 1 through a bolt, a high-pressure cavity air inlet is formed in the middle of the front end face of the high-pressure cavity 13, the high-pressure cavity air inlet is butted with an air outlet of the cylinder block 7, and the cylinder block 7 is communicated with the high-pressure cavity 13; the top of the high-pressure cavity 13 is provided with three sensor mounting ports, the number of the sensor mounting ports is set according to actual needs, and the pressure sensors 15 to be measured are mounted in the sensor mounting ports; air ports are formed in the left side surface and the right side surface of the high-pressure cavity 13, and the air ports are formed in the rear end surface of the high-pressure cavity 13 and the sensor mounting ports on the top surface in a one-to-one correspondence mode;
the air inlet on the front end surface of the high-pressure cavity 13, the air ports on the left side surface and the right side surface of the high-pressure cavity 13, the air ports on the rear end surface of the high-pressure cavity 13 and the sensor mounting port on the top of the high-pressure cavity 13 are communicated with each other through pore channels;
the air valve 17 is in threaded connection with an air port on one side surface of the high-pressure cavity 13;
the gas ports which are not connected and used on the high-pressure cavity 13 are connected with the sealing plug through threads and are sealed through an O-shaped ring or a sealing gasket, so that the gas ports are blocked;
when the air valve 17 is opened, the high-pressure cavity 13 is communicated with the outside atmosphere, and when the air valve 17 is closed, the inner pore passage of the high-pressure cavity 13 is a closed cavity.
Example six: (verification of the Components by pointer indication)
The sixth embodiment discloses a rapid calibration method for a pressure sensor, which is based on the rapid calibration device for a pressure sensor described in the fifth embodiment, and is shown in fig. 8;
in the loading process of the linear loader 2, the total volume of the pore passage in the high-pressure cavity 13 and the closed cavity at the right side of the cylinder assembly is continuously reduced, and the pressure of the high-pressure cavity and the total volume have the following relationship:
P×V/T＝C
wherein: t is the temperature of the enclosed cavity gas and C is a constant. By controlling the ambient temperature, keeping T constant, then the high pressure chamber pressure P is inversely proportional to the total volume V; since the structures of the cylinder assembly and the high-pressure cavity assembly are determined, the total volume V has a determined relation with the displacement L of the piston, so that the measured pressure sensor 15 can be verified through the displacement L of the cylinder movement.
The specific process is as follows:
c1: in a constant temperature environment, an air valve 17 on the high-pressure cavity assembly 5 is opened, and a piston 6 of the cylinder assembly 4 is driven to drive a piston head to move to a left limit position, namely to a cylinder body opening of a cylinder body 7 of the cylinder assembly 4 by controlling the linear loader 2 to act;
c2: the air valve 17 is closed, the linear loader 2 is controlled to act, the piston 6 is driven to drive the piston head to start to move linearly to the right, namely to move towards the bottom of the cylinder body 7, so that the air at the rear end in the cylinder body 7 is pressed into the high-pressure cavity 13 through the piston 6, and a certain pressure is generated in the high-pressure cavity 13;
c3: reading the indication scale value of the pointer 11 on the piston rod of the piston 6, calculating to obtain the accurate pressure in the high-pressure cavity 13 through the following formula, and calibrating the pressure sensor 15 to be measured through the pressure in the high-pressure cavity 13:
P0×(S×L0+V2)＝P1·(S×L1+V2)
in the above formula:
P0is at atmospheric pressure;
s is the cross-sectional area of the inner cavity of the cylinder block, namely the radial cross-sectional area of the piston head, and can be known according to a measured or designed value;
L0the length of an inner cavity of the cylinder body when the piston head is at a left limit position, namely the axial distance between the outer end surface of the piston head and the inner bottom surface of the cylinder body when the piston head is at the left limit position;
V2the total volume of the inner pore passage of the high-pressure cavity and the connecting part of the high-pressure cavity and the cylinder body;
P1is the pressure in the high-pressure cavity;
L1is the pressure in the high-pressure cavity is P1When the pressure is higher than the pressure in the high-pressure cavity, the length of the inner cavity of the corresponding cylinder body is equal to the pressure in the high-pressure cavity1When the piston is used, the axial distance between the outer end face of the piston head and the inner bottom face of the cylinder body can be obtained by reading the indication scale value of the pointer on the piston rod of the piston.
Example seven: (Standard pressure sensor and pointer indicating assembly are provided)
The seventh embodiment discloses a pressure sensor rapid calibration apparatus, as shown in fig. 8, the pressure sensor rapid calibration apparatus includes: the device comprises a bottom plate 1, a linear loader 2, a cylinder assembly 4, a pointer indication component high-pressure cavity assembly 5 and a standard pressure sensor 14.
The bottom plate 1 is of a flat steel plate structure, and a plurality of threaded connecting holes are formed in the horizontal surface of the bottom plate and used for installing and fixing other components;
the linear loader 2 is of a gear rack structure, can provide linear displacement and force, and is connected and fastened with the bottom plate 1 through bolts; as shown in fig. 2, the linear loader 2 is composed of a loader housing 18, a loading handle 19, a loading gear 20 and a loading rack 21, wherein the loader housing 18 is fixedly mounted on the bottom plate 1 through bolts, the loading rack 21 is horizontally arranged and mounted in the loader housing 18, the loading gear 20 is in meshing transmission connection with the loading rack 21, a rotating shaft of the loading handle 19 is coaxially and fixedly connected with the loading gear 20, and the loading gear 20 drives the loading rack 21 to horizontally and linearly move under the rotation driving of the loading handle 19, so as to realize linear loading.
The cylinder assembly 4 adopts a piston type cylinder structure and is used for converting linear force generated and output by the linear loader 2 into pressure of a closed cavity; as shown in fig. 3, the cylinder assembly 4 includes: the piston comprises a piston 6, a cylinder body 7, a clamping ring 8, a guide block 9 and an O-shaped ring 10, wherein the piston 6 is formed by coaxially and fixedly connecting a piston rod and a piston head;
the piston 6 is arranged on the inner side of the cylinder body 7, a piston rod of the piston 6 extends out of a cylinder body opening at the front end of the cylinder body 7 and is coaxially and fixedly connected with the linear displacement output end of the linear loader 2, a piston head of the piston 6 is in sealing fit connection with the inner side wall of the cylinder body through two groups of O-shaped rings 10 which are coaxially arranged in parallel, cylinder inner cavities at the front end and the rear end of the piston head in the axial direction are mutually sealed and isolated, and the piston rod drives the piston head to linearly reciprocate in the cylinder body 7 in the axial direction under the driving of the linear loader;
the guide block 9 is coaxially fixed on a piston rod of the piston 6, the outer side wall of the guide block 9 is matched and connected with the inner side wall of the cylinder body 7, and a plurality of through holes are formed in the end face of the guide block 9, so that the piston rod drives the piston head to axially and stably reciprocate along the cylinder body under the guidance of the guide block 9;
the clamping ring 8 is coaxially fixed on the inner side of a cylinder body opening at the front end of the cylinder body 7 and used for axially limiting the guide block 9 and preventing the guide block 9 from sliding out of the cylinder body 7;
the air cylinder is characterized in that an air outlet is formed in the bottom of the air cylinder body at the rear end of the air cylinder body 7, external threads are formed in the outer side of the circumference of the rear end of the air cylinder body 7 and are in threaded sealing connection with the air inlet end of the high-pressure cavity assembly 5, and the inner cavity of the air cylinder body 7 is communicated with the high-pressure cavity assembly 5 through the air outlet.
The pointer indicating assembly is arranged on the cylinder assembly 4 and consists of a pointer 11, a bolt 12 and a linear scale as shown in fig. 3; the linear scale is engraved on the outer side wall of the piston rod along the axial direction of the piston 6, the pointer 11 points to the pressure scale on the outer side wall of the piston rod, and the pressure in the cylinder block 7, namely the pressure in the high-pressure cavity 13, is obtained by reading the pressure scale value pointed by the pointer 11.
As shown in fig. 4a and 4b, the high pressure chamber assembly 5 includes: a high pressure chamber 13, a sealing plug 16 and an air valve 17;
as shown in fig. 5, a high-pressure cavity mounting seat is arranged at the bottom of the high-pressure cavity 13, the high-pressure cavity mounting seat is fixedly mounted on the bottom plate 1 through a bolt, a high-pressure cavity air inlet is formed in the middle of the front end face of the high-pressure cavity 13, the high-pressure cavity air inlet is butted with an air outlet of the cylinder block 7, and the cylinder block 7 is communicated with the high-pressure cavity 13; the top of the high-pressure cavity 13 is provided with three sensor mounting ports, the number of the sensor mounting ports is set according to actual needs, and the pressure sensors 15 to be measured are mounted in the sensor mounting ports; air ports are formed in the left side surface and the right side surface of the high-pressure cavity 13, and the air ports are formed in the rear end surface of the high-pressure cavity 13 and the sensor mounting ports on the top surface in a one-to-one correspondence mode;
the air inlet on the front end surface of the high-pressure cavity 13, the air ports on the left side surface and the right side surface of the high-pressure cavity 13, the air ports on the rear end surface of the high-pressure cavity 13 and the sensor mounting port on the top of the high-pressure cavity 13 are communicated with each other through pore channels;
the air valve 17 is in threaded connection with an air port on one side surface of the high-pressure cavity 13;
the gas ports which are not connected and used on the high-pressure cavity 13 are connected with the sealing plug through threads and are sealed through an O-shaped ring or a sealing gasket, so that the gas ports are blocked;
when the air valve 17 is opened, the high-pressure cavity 13 is communicated with the outside atmosphere, and when the air valve 17 is closed, the inner pore passage of the high-pressure cavity 13 is a closed cavity.
The standard pressure sensor 14 is installed in the sensor installation opening before the pressure sensor 15 to be detected is detected, the standard pressure value is detected through the standard pressure sensor 14 and correspondingly engraved on the outer side wall of the piston rod to form the pressure scale, and then when the pressure sensor 15 to be detected is detected, the pressure sensor 15 is directly detected through the pressure scale value pointed by the pointer.
Example eight: (verification by Standard pressure sensor and pointer indicating Assembly)
The eighth embodiment discloses a pressure sensor rapid verification method, which is based on the pressure sensor rapid verification device described in the seventh embodiment, and as shown in fig. 8, the specific process is as follows:
d1: in a constant temperature environment, a standard pressure sensor 14 is arranged on a sensor mounting port of a high-pressure cavity 13, an air valve 17 on a high-pressure cavity assembly 5 is opened, and a piston 6 of a driving cylinder assembly 4 drives a piston head to move to a left limit position by controlling the action of a linear loader 2;
d2: closing the air valve 17, and driving the piston 6 of the driving cylinder assembly 4 to drive the piston head to move from the left limit position to the right limit position by controlling the action of the linear loader 2 so as to generate a certain pressure intensity in the high-pressure cavity 13;
d3: along with the movement of the piston head driven by the piston 6, according to the pressure value in the pressure cavity 13 detected and read by the standard pressure sensor 14, on the basis of the relation between the linear displacement of the piston 6 and the pressure detected by the standard pressure sensor 14, forming a corresponding pressure scale on the outer wall of the piston rod of the piston 6 along the axial direction;
d4: the standard pressure sensor 14 is detached, and the pressure sensor 15 to be measured is replaced and installed on the sensor installation opening of the high-pressure cavity 13;
d5: an air valve 17 on the high-pressure cavity assembly 5 is opened, and the piston 6 of the driving cylinder assembly 4 drives the piston head to move to a left limit position, namely to the cylinder body opening of the cylinder body 7 of the cylinder assembly 4 by controlling the action of the linear loader 2;
d6: the air valve 17 is closed, the linear loader 2 is controlled to act, the piston 6 is driven to drive the piston head to start to move linearly to the right, namely to move towards the bottom of the cylinder body 7, so that the air at the rear end in the cylinder body 7 is pressed into the high-pressure cavity 13 through the piston 6, and a certain pressure is generated in the high-pressure cavity 13;
d7: the pressure scale value indicated by the pointer 11 on the piston rod of the piston 6 is read to verify the measured pressure sensor 15.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a quick calibrating installation of pressure sensor which characterized in that:
the method comprises the following steps: the device comprises a bottom plate (1), a linear loader (2), a cylinder assembly (4), a high-pressure cavity assembly (5) and a standard pressure sensor (14);
the linear loader (2) is fixed at one end of the bottom plate (1);
a piston (6) of the cylinder assembly (4) is coaxially and fixedly connected with a linear displacement output end of the linear loader (2);
the high-pressure cavity assembly (5) consists of a high-pressure cavity (13), a sealing plug (16) and an air valve (17), wherein an air port at the front end of the high-pressure cavity (13) is communicated with an air cylinder body (7) of the air cylinder assembly (4), a plurality of sensor mounting ports are formed in the top of the high-pressure cavity (13), the air valve (17) is mounted at an air port on the side surface of the high-pressure cavity (13), and the air port on the high-pressure cavity (13) is communicated with the mounting ports;
the standard pressure sensor (14) and the measured pressure sensor (15) are respectively arranged at a sensor mounting opening at the top of the high-pressure cavity (13), and a sensor opening without the sensor is sealed by a sealing plug (16), so that the high-pressure cavity (13) after mounting and connection is a sealed cavity.
2. A pressure sensor rapid verification method is characterized in that:
the pressure sensor rapid verification device according to claim 1, wherein the pressure sensor rapid verification method comprises the following specific processes:
a1: the air valve (17) is opened, and the piston (6) of the cylinder assembly (4) is driven to drive the piston head to move to the cylinder body opening of the cylinder body (7) of the cylinder assembly (4) by controlling the linear loader (2) to act;
a2: the air valve (17) is closed, the linear loader (2) is controlled to act, the piston (6) is driven to drive the piston head to start to move towards the bottom of the cylinder body (7), so that the air at the rear end in the cylinder body (7) is pressed into the high-pressure cavity (13) through the piston (6), and a certain pressure is generated in the high-pressure cavity (13);
a3: as the inner pore passages of the high-pressure cavity (13) are communicated with each other, the pressure in the high-pressure cavity (13) is equal everywhere, and the pressure value detected by the standard pressure sensor (14) is read as a reference value, so that the detected pressure sensor (15) can be verified.
3. The utility model provides a quick calibrating installation of pressure sensor which characterized in that:
the method comprises the following steps: the device comprises a bottom plate (1), a linear loader (2), a force sensor (3), a cylinder assembly (4) and a high-pressure cavity assembly (5);
the linear loader (2) is fixed at one end of the bottom plate (1);
one end of the force sensor (3) is fixedly connected with the linear displacement output end of the linear loader (2), and the other end of the force sensor is fixedly connected with a piston (6) of the cylinder assembly (4);
the high-pressure cavity assembly (5) comprises a high-pressure cavity (13), a sealing plug (16) and an air valve (17), wherein an air port at the front end of the high-pressure cavity (13) is communicated with an air cylinder body (7) of the air cylinder assembly (4), a plurality of sensor mounting ports are formed in the top of the high-pressure cavity (13), the air valve (17) is mounted at the air port on the side surface of the high-pressure cavity (13), and the air port on the high-pressure cavity (13) is communicated with the mounting ports.
The pressure sensor (15) to be measured is arranged at the sensor mounting opening at the top of the high-pressure cavity (13), and the sensor opening without the sensor is sealed by a sealing plug (16), so that the high-pressure cavity (13) after mounting and connection is a sealed cavity.
4. A pressure sensor rapid verification method is characterized in that:
the pressure sensor rapid verification device according to claim (3) is adopted, and the pressure sensor rapid verification method comprises the following specific processes:
b1: the air valve (17) is opened, and the piston (6) of the driving cylinder assembly (4) drives the piston head to move to the cylinder body opening of the cylinder body (7) by controlling the action of the linear loader (2);
b2: by controlling the action of the linear loader (2), a piston (6) of the driving cylinder assembly (4) drives a piston head to slowly move towards the bottom of a cylinder body of the cylinder body (7) at a constant speed, and the detected pressure value of the force sensor (3) at the moment is recorded, wherein the value is the force acted on the piston (6) by the linear loader (2) at the moment and is also the friction force f between the inner wall of the cylinder body (7) of the cylinder assembly (4) and the piston head of the piston (6);
b3: by controlling the action of the linear loader (2), a piston (6) of the driving cylinder assembly (4) drives a piston head to move to a cylinder body opening of a cylinder body (7);
b4: closing the air valve (17), driving the piston (6) to drive the piston head to start to linearly move towards the bottom of the cylinder body (7) by controlling the action of the linear loader (2) so as to press the gas at the rear end in the cylinder body (7) into the high-pressure cavity (13) through the piston (6), so that a certain pressure P is generated in the high-pressure cavity (13), and recording a pressure value F detected by the force sensor (3) at the moment;
b5: the accurate pressure in the cylinder body (7), namely the pressure in the high-pressure cavity (13), is calculated through the following formula, and the pressure sensor (15) to be measured is verified through the pressure in the high-pressure cavity (13):
P＝(F-f)×S；
in the above formula:
p is the pressure in the high-pressure cavity;
f is the pressure value detected by the sensor and is also the pressure value in the cylinder body;
f is the friction force between the inner wall of the cylinder body and the piston head of the piston;
and S is the cross-sectional area of the inner cavity of the cylinder block, namely the radial cross-sectional area of the piston head, and can be known according to a measured or designed value.
5. The utility model provides a quick calibrating installation of pressure sensor which characterized in that:
the method comprises the following steps: the device comprises a bottom plate (1), a linear loader (2), a cylinder assembly (4), a pointer indicating assembly and a high-pressure cavity assembly (5);
the linear loader (2) is fixed at one end of the bottom plate (1);
a piston (6) of the cylinder assembly (4) is coaxially and fixedly connected with a linear displacement output end of the linear loader (2);
the pointer indicating assembly is arranged on the cylinder assembly (4) and consists of a pointer (11), a bolt (12) and linear scales; the linear scale is engraved on the outer side wall of the piston rod along the axial direction of the piston (6), the pointer (11) points to the linear distance scale of the outer side wall of the piston rod, and the distance of the piston (6) moving along the axial direction is obtained by reading the scale value of the pointer (11) pointing to the linear distance scale;
the high-pressure cavity assembly (5) consists of a high-pressure cavity (13), a sealing plug (16) and an air valve (17), wherein an air port at the front end of the high-pressure cavity (13) is communicated with an air cylinder body (7) of the air cylinder assembly (4), a plurality of sensor mounting ports are formed in the top of the high-pressure cavity (13), the air valve (17) is mounted at an air port on the side surface of the high-pressure cavity (13), and the air port on the high-pressure cavity (13) is communicated with the mounting ports;
the pressure sensor (15) to be measured is arranged at the sensor mounting opening at the top of the high-pressure cavity (13), and the sensor opening without the sensor is sealed by a sealing plug (16), so that the high-pressure cavity (13) after mounting and connection is a sealed cavity.
6. A pressure sensor rapid verification method is characterized in that:
the pressure sensor rapid verification device according to claim 5, wherein the pressure sensor rapid verification method comprises the following specific processes:
c1: in a constant temperature environment, an air valve (17) is opened, and a piston (6) of a driving cylinder assembly (4) drives a piston head to move to a cylinder body opening of a cylinder body (7) of the cylinder assembly (4) by controlling the linear loader (2) to act;
c2: the air valve (17) is closed, the linear loader (2) is controlled to act, the piston (6) is driven to drive the piston head to start to move towards the bottom of the cylinder body (7), so that the air at the rear end in the cylinder body (7) is pressed into the high-pressure cavity (13) through the piston (6), and a certain pressure is generated in the high-pressure cavity (13);
c3: reading an indication scale value of the pointer (11) on a piston rod of the piston (6), calculating to obtain accurate pressure in the high-pressure cavity (13) through the following formula, and calibrating the pressure sensor (15) to be measured through the pressure in the high-pressure cavity (13):
P0×(S×L0+V2)＝P1·(S×L1+V2)
in the above formula:
P0is at atmospheric pressure;
s is the cross-sectional area of the inner cavity of the cylinder block, namely the radial cross-sectional area of the piston head, and can be known according to a measured or designed value;
L0the length of an inner cavity of the cylinder body when the piston head is at a left limit position, namely the axial distance between the outer end surface of the piston head and the inner bottom surface of the cylinder body when the piston head is at the position of a cylinder body opening of the cylinder body (7);
V2the total volume of the inner pore passage of the high-pressure cavity and the connecting part of the high-pressure cavity and the cylinder body;
P1is the pressure in the high-pressure cavity;
L1is the pressure in the high-pressure cavity is P1While corresponding to the inner cavity of the cylinder bodyLength, i.e. pressure in the high-pressure chamber, P1The axial distance between the outer end face of the piston head and the inner bottom face of the cylinder body is obtained by reading the indication scale value of the pointer on the piston rod of the piston.
7. The utility model provides a quick calibrating installation of pressure sensor which characterized in that:
the method comprises the following steps: the device comprises a bottom plate (1), a linear loader (2), a cylinder assembly (4), a pointer indicating assembly high-pressure cavity assembly (5) and a standard pressure sensor (14);
the linear loader (2) is fixed at one end of the bottom plate (1);
a piston (6) of the cylinder assembly (4) is coaxially and fixedly connected with a linear displacement output end of the linear loader (2);
the pointer indicating assembly is arranged on the cylinder assembly (4) and consists of a pointer (11), a bolt (12) and linear scales; the linear scale is engraved on the outer side wall of the piston rod along the axial direction of the piston (6), the pointer (11) points to the linear distance scale of the outer side wall of the piston rod, and the distance of the piston (6) moving along the axial direction is obtained by reading the scale value of the pointer (11) pointing to the linear distance scale;
the high-pressure cavity assembly (5) consists of a high-pressure cavity (13), a sealing plug (16) and an air valve (17), wherein an air port at the front end of the high-pressure cavity (13) is communicated with an air cylinder body (7) of the air cylinder assembly (4), a plurality of sensor mounting ports are formed in the top of the high-pressure cavity (13), the air valve (17) is mounted at an air port on the side surface of the high-pressure cavity (13), and the air port on the high-pressure cavity (13) is communicated with the mounting ports;
the standard pressure sensor (14) and the measured pressure sensor (15) are respectively arranged at a sensor mounting opening at the top of the high-pressure cavity (13), and a sensor opening without the sensor is sealed by a sealing plug (16), so that the high-pressure cavity (13) after mounting and connection is a sealed cavity.
8. A pressure sensor rapid verification method is characterized in that:
the pressure sensor rapid verification device according to claim (7) is adopted, and the pressure sensor rapid verification method comprises the following specific processes:
d1: in a constant temperature environment, a standard pressure sensor (14) is arranged on a sensor mounting port of a high-pressure cavity (13), an air valve (17) on a high-pressure cavity assembly (5) is opened, and a piston (6) of a driving cylinder assembly (4) drives a piston head to move to a cylinder body port position of a cylinder body (7) by controlling the action of a linear loader (2);
d2: the air valve (17) is closed, and the piston (6) of the driving cylinder assembly (4) drives the piston head to move from the position of the cylinder body opening of the cylinder body (7) to the position of the bottom of the cylinder body by controlling the action of the linear loader (2), so that a certain pressure is generated in the high-pressure cavity (13);
d3: along with the movement of the piston head driven by the piston (6), according to the pressure value in the pressure cavity (13) detected and read by the standard pressure sensor (14), on the basis of the relation between the linear displacement of the piston (6) and the pressure detected by the standard pressure sensor (14), forming corresponding pressure scales on the outer wall of the piston rod of the piston (6) along the axial direction;
d4: the standard pressure sensor (14) is detached, and the pressure sensor (15) to be measured is replaced and installed on the sensor installation opening of the high-pressure cavity (13);
d5: an air valve (17) on the high-pressure cavity assembly (5) is opened, and a piston (6) of a driving cylinder assembly (4) drives a piston head to move to a cylinder body opening position of a cylinder body (7) by controlling the action of the linear loader (2);
d6: the air valve (17) is closed, the linear loader (2) is controlled to act, the piston (6) is driven to drive the piston head to start to linearly move towards the bottom of the cylinder body (7), so that the air at the rear end in the cylinder body (7) is pressed into the high-pressure cavity (13) through the piston (6), and a certain pressure is generated in the high-pressure cavity (13);
d7: the pressure scale value indicated by the pointer (11) on the piston rod of the piston (6) is read to verify the pressure sensor (15) to be measured.
9. The rapid calibration device for pressure sensors according to claim 1, 3, 5 or 7, wherein:
the linear loader (2) consists of a loader shell (18), a loading handle (19), a loading gear (20) and a loading rack (21);
loader casing (18) pass through bolt fixed mounting on bottom plate (1), loading rack (21) level sets up and installs in loader casing (18), loading gear (20) are connected with loading rack (21) meshing transmission, the rotatory pivot and the loading gear (20) of loading handle (19) are coaxial to be linked firmly, and under the rotatory drive of loading handle (19), loading gear (20) drive loading rack (21) horizontal linear motion realizes linear loading.
10. The rapid calibration device for pressure sensors according to claim 1, 3, 5 or 7, wherein:
the air cylinder assembly (4) is composed of a piston (6), an air cylinder body (7), a clamping ring (8), a guide block (9) and an O-shaped ring (10), wherein the piston (6) is composed of a piston rod and a piston head which are coaxially and fixedly connected;
a piston rod of the piston (6) extends out of a cylinder body opening at the front end of the cylinder body (7) and is fixedly connected with the front end part, and a piston head of the piston (6) is in sealing fit connection with the inner side wall of the cylinder body through two groups of coaxial and parallel O-shaped rings (10);
the guide block (9) is coaxially fixed on a piston rod of the piston (6), the outer side wall of the guide block (9) is connected with the inner side wall of the cylinder body (7) in a matching manner, and a plurality of through holes are formed in the end face of the guide block (9);
the clamping ring (8) is coaxially fixed on the inner side of a cylinder body opening at the front end of the cylinder body (7) to realize axial limiting of the guide block (9);
and the bottom of the cylinder body at the rear end of the cylinder body (7) is provided with an air outlet, and the air outlet is in threaded sealing connection with the air inlet end of the high-pressure cavity assembly (5).
CN202010938631.3A 2020-09-09 2020-09-09 Rapid calibrating device and calibrating method for pressure sensor Pending CN112213027A (en)

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CN114518194A (en) * 2022-02-21 2022-05-20 中国第一汽车股份有限公司 Pressure sensor detection equipment and detection method
CN116753211A (en) * 2023-08-11 2023-09-15 烟台星辉劳斯堡液压机械有限公司 Position detection device of hydraulic cylinder

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CN102519669A (en) * 2011-12-23 2012-06-27 合肥工业大学 Pressure fluctuation calibrating device of pressure or differential pressure sensor and calibrating method thereof
CN210005163U (en) * 2019-03-29 2020-01-31 王东岳 Detection device for pressure gauges
CN111024286A (en) * 2019-12-02 2020-04-17 中国第一汽车股份有限公司 Device for measuring mounting force and dismounting force of universal joint of driving shaft

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Publication number Priority date Publication date Assignee Title
CN101776507A (en) * 2009-12-29 2010-07-14 威海华东数控股份有限公司 Pressure sensor detecting device
CN102519669A (en) * 2011-12-23 2012-06-27 合肥工业大学 Pressure fluctuation calibrating device of pressure or differential pressure sensor and calibrating method thereof
CN210005163U (en) * 2019-03-29 2020-01-31 王东岳 Detection device for pressure gauges
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114518194A (en) * 2022-02-21 2022-05-20 中国第一汽车股份有限公司 Pressure sensor detection equipment and detection method
CN116753211A (en) * 2023-08-11 2023-09-15 烟台星辉劳斯堡液压机械有限公司 Position detection device of hydraulic cylinder
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Application publication date: 20210112