CN112683769A - Force measuring device suitable for extreme multi-factor coupling environment - Google Patents
Force measuring device suitable for extreme multi-factor coupling environment Download PDFInfo
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- CN112683769A CN112683769A CN202110023326.6A CN202110023326A CN112683769A CN 112683769 A CN112683769 A CN 112683769A CN 202110023326 A CN202110023326 A CN 202110023326A CN 112683769 A CN112683769 A CN 112683769A
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Abstract
The invention discloses a measuring device suitable for force under an extreme multi-factor coupling environment, which avoids the problem that in the prior art, a high-temperature high-pressure sensor is connected in series in a loading pull rod in a threaded connection mode to directly measure the force of a test piece under the high-temperature high-pressure environment, so that the problem of measurement error caused by looseness of the joint of the sensor in the process of long-term use, particularly fatigue test, is avoided, and the problems that the high-temperature high-pressure sensor with the same-precision high-temperature and high-pressure resistant function has a complex structure and is expensive in manufacturing cost compared with a standard force sensor under the conventional condition are solved; the force sensor which is designed and processed integrally with the loading pull rod and is suitable for the normal-temperature normal-pressure air environment can directly measure the test piece force, is reliable to use for a long time, simple in structure and easy to maintain, can realize high-precision measurement, and solves the problem that the measurement data is inaccurate because no sensor which is suitable for extreme multi-factor coupling environments such as ultrahigh-temperature ultrahigh-pressure corrosive water or steam environment functions is available.
Description
Technical Field
The invention relates to a force measuring device suitable for an extreme multi-factor coupling environment.
Background
In order to perform service safety evaluation on metal materials working in an extremely multi-factor coupling environment such as an ultrahigh-temperature ultrahigh-pressure corrosive water or steam environment, a sample is placed in a closed container such as an autoclave in the high-temperature high-pressure corrosive water or steam environment for mechanical property test, however, no force sensor suitable for directly measuring the test piece force under the condition environment exists in the market at present.
The closest prior art is that chinese invention patent application publication CN 111060392 a discloses a device capable of directly measuring tension and compression loads in a high temperature and high pressure container, which includes adopting a breaking pull rod, then combining two ends of a force sensor with the end parts of two breaking pull rods into a whole by adopting a threaded connection mode, and directly placing the force sensor in a high temperature and high pressure environment to measure the test piece force, in addition, the pressure balance mechanism in the technology adopts a bellows to isolate the force sensor and the high pressure container into two chambers, and adopts a method with the same pressure of different media to eliminate the additional force acting on the test piece, although the method avoids the influence of friction force on the force measurement accuracy, the method also brings problems: first, bellows pressure balance mechanism also produces certain additional force when experimental, cause measuring error, secondly the sensor that has the high temperature and high pressure resistant function of equal precision compares with conventional standard force transducer, high temperature and high pressure sensor structure is complicated, the cost is expensive, thirdly adopt the disconnection pull rod, connect into method wherein with force transducer, long-term use, especially do fatigue test, threaded connection department produces easily not hard up, it is difficult for perceiving, cause measuring error, fourthly do not have the relevant standard who is applicable to high temperature and high pressure sensor demarcation or calibration now, this is with the credibility that influences sensor measuring result.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the device for measuring the force in an extremely multi-factor coupling environment such as an ultrahigh-temperature ultrahigh-pressure corrosive water or steam environment, wherein the force of a test piece can be directly measured, and the measuring system has the advantages of simple structure, easiness in maintenance, high measuring accuracy and high reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
the force measuring device is characterized by consisting of an autoclave, a loading pull rod, an outer sleeve, a force sensor, an intermediate sleeve, a pressure balance piston b, a pressure balance piston a and a spiral temperature isolating device. One end of the outer sleeve is connected with the bottom end of the high-pressure kettle in a sealing mode, a sealing device is arranged in the through hole at the other end of the outer sleeve, and the outer sleeve is provided with a stepped through hole along the axis and is communicated with the high-pressure kettle. The loading pull rod is arranged in the stepped through hole of the outer sleeve in a penetrating way, one end of the loading pull rod extends into the autoclave, and the other end of the loading pull rod is connected with the bottom of the outer sleeve through a sealing device and extends out of the through hole. The force sensor, the loading pull rod and the pressure balance piston are designed and manufactured integrally, and the loading pull rod is positioned below the sensor. The force sensor is suitable for being used in the air environment at normal temperature and normal pressure.
Further, the inner cavity of the high-pressure kettle is in an ultrahigh-temperature ultrahigh-pressure corrosive water or steam environment:
furthermore, a hollow blind hole is formed in the bottom end face of the loading pull rod along the axis; the pressure balance piston a is positioned at the top space position of the hollow blind hole on the loading pull rod.
Further, the pressure balance piston b is also designed and manufactured integrally with the loading pull rod and is positioned below the pressure balance piston a.
Furthermore, the middle sleeve is sleeved at the bottom space position of the stepped through hole of the outer sleeve, the stepped through hole is formed along the axis, the stepped through hole of the middle sleeve is respectively connected with the pressure balance piston a and the pressure balance piston b in a sealing mode, and a low-pressure cavity is formed between the stepped through hole and the pressure balance piston a.
Furthermore, a groove is formed in the outer side of the middle sleeve in parallel with the axis and communicated with grooves formed in two end faces of the middle sleeve, one end of the groove formed in the outer side face of the middle sleeve is positioned above the pressure balance piston a and communicated with the high-pressure container, and the other end of the groove is positioned at the lower part of the pressure balance piston b and communicated with the outer end face space of the pressure balance piston b.
Further, the spiral temperature isolation device is in contact connection with the outer side face of the top of the outer sleeve.
Preferably, the space of the spiral temperature isolation device is formed by winding a spiral pipe.
The working principle of the invention is as follows:
during the test, ultrahigh-temperature ultrahigh-pressure corrosive liquid or gas is filled in the autoclave, the space formed by the autoclave, the outer sleeve and the loading pull rod is communicated with the groove formed in the outer side surface of the middle sleeve, when the autoclave is pressurized, pressure flows into the space of the outer end surface of the pressure balance piston b through the groove, at the moment, the internal pressure of the autoclave is the same as the pressure on the outer end surface of the pressure balance piston b, and therefore the test piece force measurement error caused by pressure fluctuation in the autoclave in the working process can be eliminated.
Because the force sensor is positioned at the inner blind hole of the loading pull rod, the blind hole isolates high-pressure corrosive water or steam outside the loading pull rod to form a normal pressure and air environment, and because the force sensor is positioned at the lower part of the spiral temperature isolating device, circulating gas which is pre-refrigerated is introduced between an inlet and an outlet on the spiral temperature isolating device, the upper environment of the force sensor can be cooled, so that the measurement environment of the force sensor is the normal temperature and normal pressure air environment, and a sensor with the functions of high temperature, high pressure and water or steam is not needed, and high-precision measurement can be carried out
The sensor is positioned at the upper part of the pressure balance piston a, and is not subjected to the friction force generated by sealing between the outer sleeve and the loading pull rod during force measurement, so that the force measurement accuracy is high.
The invention has the following advantages:
1, a sensor which is designed and processed integrally with a loading pull rod and is suitable for a normal-temperature normal-pressure air environment is adopted, a sensor with a high-temperature high-pressure water or steam function is not needed, and the measurement precision is high;
2, the sensor which is integrally designed and processed with the loading pull rod and is suitable for the normal-temperature normal-pressure air environment is adopted to replace a high-temperature high-pressure sensor which is connected with the loading pull rod in series, so that the problem of measurement error caused by long-term use, particularly difficulty in detection of looseness generated at a joint, particularly a threaded connection, in the process of a fatigue test is avoided, and the problem of reliability in long-term use is solved, and the sensor is simple in structure and easy to maintain;
3, the sensor suitable for the air environment at normal temperature and normal pressure is adopted, the existing relevant standards can be executed to calibrate or calibrate the accuracy of the sensor, and the measured data is credible and reliable.
Drawings
Fig. 1 is a schematic structural cross-sectional view of a force measuring device suitable for use in an extreme multi-factor coupling environment according to this embodiment.
Reference numbers in the figures:
1, an autoclave 2, a loading pull rod 3, an outer sleeve 4, a force sensor 5, an intermediate sleeve 6, a pressure balance piston b 7, a pressure balance piston a 8 and a spiral temperature isolation device.
Detailed Description
The technical solution of the present invention is further described with reference to fig. 1 and the specific embodiments.
In order to perform service safety evaluation on a metal material working in an extreme multi-factor coupling environment such as an ultrahigh-temperature ultrahigh-pressure corrosive water or steam environment, a sample of the metal material is placed in a closed container such as an autoclave in the high-temperature high-pressure corrosive water or steam environment for mechanical property test, and fig. 1 is a schematic diagram of a testing machine working in the ultrahigh-temperature ultrahigh-pressure corrosive water or steam environment.
Referring to fig. 1, the testing machine comprises an autoclave (1), the inner cavity of which is a high-temperature and high-pressure corrosive water or steam environment cavity, and the force measuring device comprises:
one end of the outer sleeve (3) is connected with the bottom end of the high-pressure kettle (1) in a sealing mode, a sealing device is arranged in a hole at the other end of the outer sleeve, and the outer sleeve (3) is provided with a stepped through hole along the axis and is communicated with the high-pressure kettle (1).
The loading pull rod (2) is arranged in the stepped through hole of the outer sleeve (3) in a penetrating mode, one end of the loading pull rod extends into the autoclave, the other end of the loading pull rod is connected with the bottom hole of the outer sleeve (3) in a sealing mode and extends out of the hole, and a hollow blind hole is formed in the end face of the bottom of the loading pull rod (2) along the axis.
The force sensor (4), the pressure balance piston b (6), the pressure balance piston a (7) and the loading pull rod (2) are designed and manufactured integrally, and the force sensor (4) is located at the top space position of a hollow blind hole in the loading pull rod (2); the force sensor (4) is characterized in that a pressure balance piston b (6), a pressure balance piston a (7) and the loading pull rod (2) are designed and manufactured integrally, and the pressure balance piston a (7) is positioned below the force sensor (4); the pressure balance piston b (6) is positioned below the pressure balance piston a (7). The force sensor (4) is suitable for being used in the air environment at normal temperature and normal pressure.
The middle sleeve (5) is arranged at the spatial position of the bottom of the stepped hole of the outer sleeve (3), a stepped through hole is formed along the axis, the stepped through hole of the middle sleeve (5) is respectively connected with the pressure balance piston a (7) and the pressure balance piston b (6) in a sealing way, a low-pressure cavity is formed between the stepped through hole and the pressure balance piston a and the pressure balance piston b, a groove is formed in the outer side of the middle sleeve (5) in parallel with the axis and communicated with grooves formed in two end faces of the middle sleeve (5), one end of the groove formed in the outer side face of the middle sleeve (5) is positioned above the pressure balance piston a (7) and communicated with the high-pressure container (1), and the other end of the groove is positioned at the lower part of the pressure balance piston b (6) and is communicated with.
Spiral temperature isolating device (8) with the top lateral surface contact of overcoat (3) is connected, the space of spiral temperature isolating device (8) adopts the spiral pipe coiling to form, lets in refrigerated circulating gas in advance between its entry and export, just can be right force sensor (4) upper portion environment cools down.
Claims (8)
1. The force measuring device is characterized by consisting of an autoclave (1), a loading pull rod (2), an outer sleeve (3), a force sensor (4), a middle sleeve (5), a pressure balance piston b (6), a pressure balance piston a (7) and a spiral temperature isolating device (8); one end of the outer sleeve (3) is connected with the bottom end of the high-pressure kettle (1) in a sealing mode, a sealing device is arranged in a hole at the other end of the outer sleeve, and the outer sleeve (3) is provided with a stepped through hole along the axis and is communicated with the high-pressure kettle (1); the loading pull rod (2) is arranged in the stepped through hole of the outer sleeve (3) in a penetrating way, one end of the loading pull rod extends into the autoclave, and the other end of the loading pull rod is connected with the bottom of the outer sleeve (3) through a sealing device and extends out of the through hole; the force sensor (4), the loading pull rod (2) and the pressure balance piston a (7) are designed and manufactured integrally, and the loading pull rod (2) is positioned below the sensor (4); the force sensor (4) is suitable for being used in the air environment at normal temperature and normal pressure.
2. The force measuring device suitable for the extreme multi-factor coupling environment according to claim 1, wherein the inner cavity of the autoclave (1) is an ultrahigh temperature and ultrahigh pressure corrosive water or steam environment.
3. The force measuring device suitable for the extreme multi-factor coupling environment as claimed in claim 1, wherein a hollow blind hole is formed on the bottom end face of the loading pull rod (2) along the axis; the pressure balance piston a (7) is positioned at the top space position of the hollow blind hole on the loading pull rod (2).
4. The force measuring device for the extreme multifactor coupling environment as claimed in claim 1, characterized in that the pressure balance piston b (6) is also designed and manufactured integrally with the loading rod (2) and is located below the pressure balance piston a (7).
5. The force measuring device suitable for the extreme multifactor coupling environment according to claim 1, wherein the intermediate sleeve (5) is installed at a position of a bottom space of the stepped through hole of the outer sleeve (3) and is provided with a stepped through hole along an axis, the stepped through hole of the intermediate sleeve (5) is respectively connected with the pressure balance piston a (7) and the pressure balance piston b (6) in a sealing manner, and a low pressure cavity is formed therebetween.
6. The force measuring device suitable for the extreme multi-factor coupling environment according to claim 5, wherein a groove is formed in the outer side of the middle sleeve (5) in parallel with the axis and communicated with grooves formed in two end faces of the middle sleeve, one end of the groove formed in the outer side face of the middle sleeve (5) is positioned above the pressure balance piston a (7) and communicated with the high-pressure container (1), and the other end of the groove is positioned at the lower part of the pressure balance piston b (6) and communicated with the outer end face space of the pressure balance piston b.
7. The force measuring device for extreme multifactor coupling environment as claimed in claim 1, characterized in that the spiral temperature insulating means (8) is in contact connection with the top outer side of the outer jacket (3).
8. The force measuring device suitable for the extreme multifactor coupling environment as claimed in claim 7, characterized in that the space of the spiral temperature isolation device (8) is formed by winding a spiral pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110023326.6A CN112683769A (en) | 2021-01-08 | 2021-01-08 | Force measuring device suitable for extreme multi-factor coupling environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110023326.6A CN112683769A (en) | 2021-01-08 | 2021-01-08 | Force measuring device suitable for extreme multi-factor coupling environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112683769A true CN112683769A (en) | 2021-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110023326.6A Pending CN112683769A (en) | 2021-01-08 | 2021-01-08 | Force measuring device suitable for extreme multi-factor coupling environment |
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|---|---|
| CN (1) | CN112683769A (en) |
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2021
- 2021-01-08 CN CN202110023326.6A patent/CN112683769A/en active Pending
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