Performance detection device of high temperature and melt sensor based on constant temperature coupling

Abstract

The invention relates to the technical field of high-temperature pressure sensor testing, and discloses a constant-temperature coupling-based high-temperature and melt sensor performance detection device, which is characterized by comprising a constant-temperature coupling module, a to-be-tested sensor mounting structure and a pressure conduction module, the to-be-tested sensor mounting structure is connected with a to-be-tested sensor and measures the temperature in real time, and the pressure conduction module is connected with the constant-temperature coupling module; the constant-temperature coupling module is connected with the to-be-tested sensor mounting structure and used for heating a to-be-tested sensor at a constant temperature, and the pressure conduction module is connected with the to-be-tested sensor mounting structure and used for conveying pressure to pressurize the to-be-tested sensor on the to-be-tested sensor mounting structure. According to the invention, high-temperature and high-pressure testing is realized, and enterprises are helped to analyze and improve the structure of the melt pressure sensor. Through temperature compensation, structure improvement, raw material improvement and process improvement, the high-temperature melt pressure sensor and the high-temperature pressure transmitter are more stable in a high-temperature and high-pressure environment, and measurement is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature pressure sensor testing, and in particular to a performance detection device for high-temperature and melt sensors based on constant temperature coupling. Background Art

[0002] High-temperature melt pressure sensors and high-temperature melt pressure transmitters (such as those used in chemical fiber and rubber and plastic extruders and injection molding machines) need to operate in high-temperature environments (>200°C). However, existing pressure calibration equipment (such as piston pressure gauges) only supports room temperature testing and cannot simulate real working conditions.

[0003] Traditional high-temperature testing methods use hot oil baths or ovens for heating, which have low temperature control accuracy (above ±5°C), and the thermal expansion of the pressure-transmitting medium leads to measurement distortion.

[0004] There is heat conduction hysteresis between the sensor probe and the mounting joint, which causes a large deviation between the actual probe temperature and the set value, affecting the calibration accuracy.

[0005] In the existing technology, an isolation cooling device is generally used to protect the pressure gauge for detection, but it is impossible to achieve high-temperature constant temperature control of the sensor probe. The pressure gauge and the sensor are heated synchronously by the overall heating of the high-temperature chamber, which will cause the pressure gauge accuracy to drift. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a performance detection device of a high temperature and melt sensor based on constant temperature coupling.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] 1. A performance testing device for high-temperature and melt sensors based on constant temperature coupling, comprising a constant temperature coupling module, a sensor mounting structure to be tested, and a pressure conduction module. The sensor mounting structure to be tested is connected to the sensor to be tested and measures the temperature in real time. The constant temperature coupling module is connected to the sensor mounting structure to heat the sensor to be tested at a constant temperature. The pressure conduction module is connected to the sensor mounting structure to deliver pressure to pressurize the sensor to be tested on the sensor mounting structure.

[0009] In a preferred embodiment of the present invention, the sensor to be tested mounting structure is a high-temperature joint, a temperature sensor is embedded in the high-temperature joint, and the sensor to be tested is connected to the high-temperature joint.

[0010] In a preferred embodiment of the present invention, one end of the high-temperature joint is provided with a thread corresponding to the sensor to be tested, and the sensor to be tested is installed on the top of the high-temperature joint through thread sealing. The probe of the sensor to be tested directly extends into the internal cavity of the high-temperature joint and is connected to the temperature sensor embedded in the high-temperature joint.

[0011] In a preferred embodiment of the present invention, there are multiple high-temperature joints, and each high-temperature joint is connected to a corresponding sensor to be tested.

[0012] In a preferred embodiment of the present invention, the constant temperature coupling module includes a temperature control unit, a heating unit, a switching power supply and a high temperature alarm. The heating unit is connected to the mounting structure of the sensor to be tested to heat the mounting structure of the sensor to be tested. The temperature control unit is respectively connected to the heating unit and the mounting structure of the sensor to be tested. The switching power supply is respectively connected to the temperature control unit and the heating unit. The high temperature alarm is connected to the temperature control unit.

[0013] In a preferred embodiment of the present invention, the temperature control unit includes a temperature control instrument, a K-type thermocouple, a rotary switch, a circuit breaker, a DC ammeter and a solid-state relay. The temperature control instrument is respectively connected to the K-type thermocouple, the high temperature alarm and the switching power supply, the rotary switch is connected to the switching power supply, the circuit breaker is connected to the rotary switch, the DC ammeter is respectively connected to the circuit breaker and the heating unit, and the solid-state relay is respectively connected to the heating unit and the temperature control instrument.

[0014] In a preferred embodiment of the present invention, the heating unit includes a plurality of heating plates, and the number of DC ammeters and solid-state relays is the same as the number of heating plates.

[0015] In a preferred embodiment of the present invention, the pressure conduction module includes a high-temperature and high-pressure tube and a piston pressure gauge, the high-temperature and high-pressure tube is connected to the mounting structure of the sensor to be tested, the high-temperature and high-pressure tube is connected to the other end of the high-temperature joint, and the piston pressure gauge is connected to the high-temperature and high-pressure tube.

[0016] In a preferred embodiment of the present invention, a cooling jacket is provided outside the high-temperature and high-pressure pipe.

[0017] In a preferred embodiment of the present invention, the piston pressure gauge includes a weight, a weight tray, a measuring piston, a piston cylinder, a shut-off valve, a working fluid, a working piston, a hand pump, a screw and a pressurizing handwheel. The working fluid and the working piston are located in the piston cylinder. The pressurizing handwheel is connected to the working piston through a screw, the measuring piston is connected to the piston cylinder, the weight tray is connected to the measuring piston, the weight tray is provided with a weight, the shut-off valve is arranged on the piston cylinder, and the piston cylinder is connected to the high-temperature and high-pressure pipe.

[0018] The beneficial effects of the present invention are:

[0019] This invention not only enables high-temperature and high-pressure testing but also helps companies analyze and improve the structure of melt pressure sensors. Through temperature compensation, improved structure, improved raw materials, and improved processes, high-temperature melt pressure sensors and high-temperature pressure transmitters are made more stable and provide more accurate measurements in high-temperature and high-pressure environments.

[0020] Furthermore, the overall structure of the present invention is simple and the testing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a structural diagram of the constant temperature coupling module;

[0024] Figure 3 It is a detection flow chart of the present invention. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below.

[0026] See also Figure 1-3 The performance detection device of the high temperature and melt sensor based on constant temperature coupling provided by the present invention includes a constant temperature coupling module 100, a sensor mounting structure 200 and a pressure conduction module 300.

[0027] The sensor mounting structure 200 is used to install the sensor to be tested, such as a high-temperature melt pressure sensor or a high-temperature pressure transmitter. It is specifically a high-temperature joint 210. A temperature sensor is embedded inside the high-temperature joint 210 and a ceramic heating plate is wrapped on the outside. The sensor to be tested is connected to the high-temperature joint 210. The high-temperature joint 210 can heat the sensor to be tested, and the probe of the temperature sensor in the high-temperature joint 210 is directly connected to the sensor to be tested, so that real-time temperature measurement can be performed.

[0028] Specifically, one end of the high temperature joint 210 is provided with a thread corresponding to the sensor to be tested, so that the sensor to be tested can be installed on the top of the high temperature joint 210 through thread sealing, thereby improving the sealing performance and the test accuracy.

[0029] Specifically, a layer of nano-aerogel is wrapped around the high-temperature joint 210, which can reduce heat loss (heat loss rate <3%).

[0030] In this embodiment, the temperature sensor is in direct physical contact with the sensor to be measured to measure the temperature, which can eliminate the temperature gradient of traditional hot air heating, and the probe temperature uniformity is greater than 99%. The temperature sensor can send the detected temperature information to the constant temperature coupling module 100 in real time.

[0031] In this embodiment, the sensor mounting structure 200 may include multiple high-temperature connectors 210 , so that each high-temperature connector 210 can be connected to a sensor to be tested, thereby enabling simultaneous measurement of multiple sensors and improving detection efficiency.

[0032] The constant temperature coupling module 100 is connected to the sensor mounting structure 200 to heat the sensor mounting structure 200 and maintain a constant temperature, thereby ensuring that the sensor is measured at a constant temperature and ensuring measurement accuracy.

[0033] The constant temperature coupling module 100 includes a temperature control unit 110 , a heating unit 120 , a switching power supply 130 and a high temperature alarm 140 .

[0034] The heating unit 120 is connected to the sensor mounting structure 200 to be tested, and is used to heat the sensor to be tested on the sensor mounting structure 200, specifically by heating the ceramic heating plate outside the high-temperature joint 210, thereby heating the sensor to be tested connected to the high-temperature joint 210. The temperature control unit 110 is respectively connected to the heating unit 120 and the temperature sensor in the high-temperature joint 210. The temperature control unit 110 controls the operation of the heating unit 120 according to the temperature information sent by the temperature sensor to achieve constant temperature heating. The switching power supply is respectively connected to the temperature control unit 110 and the heating unit 120, and is used to control the opening or closing of this application. The high-temperature alarm 140 is connected to the temperature control unit 110. When the temperature sent by the temperature sensor is too high, the temperature control unit 110 can control the high-temperature alarm 140 to alarm.

[0035] In this embodiment, the temperature control unit 110 includes a temperature control instrument 111, a K-type thermocouple 112, a rotary switch 113, a circuit breaker 114, a DC ammeter 115, and a solid-state relay 116. The temperature control instrument 111 is respectively connected to the K-type thermocouple 112, the high temperature alarm 140, and the switching power supply 130; the rotary switch 113 is connected to the switching power supply 130; the circuit breaker 114 is connected to the rotary switch 113; the DC ammeter 115 is respectively connected to the circuit breaker 114 and the heating unit 120; and the solid-state relay 116 is respectively connected to the heating unit 120 and the temperature control instrument 111.

[0036] In this embodiment, the heating unit 120 may include several heating plates 121, and the number of DC ammeters 115, solid-state relays 116, heating plates 121 and high-temperature joints 210 is the same, so that each heating plate 121 can heat one high-temperature joint 210, specifically by quickly heating the ceramic heating plate outside the high-temperature joint 210.

[0037] The heating unit 120 may further include a high-temperature heating platform 122 , and the heating plate 121 and the high-temperature joint 210 may be placed on the high-temperature heating platform 122 for heating and testing.

[0038] The pressure transmission module 300 is connected to the sensor mounting structure 200 to transmit pressure to pressurize the sensor on the sensor mounting structure 200 , thereby enabling the sensor to be tested to be tested at corresponding temperature and pressure.

[0039] The pressure transmission module 300 includes a high-temperature and high-pressure tube 310 and a piston pressure gauge 320. The high-temperature and high-pressure tube 310 is connected to the other end of the high-temperature connector 210, and the piston pressure gauge 320 is connected to the high-temperature and high-pressure tube 310. The piston pressure gauge 320 directly transmits pressure to the high-temperature connector 210 through the high-temperature and high-pressure tube 310, thereby pressurizing the sensor to be tested connected to the high-temperature connector 210.

[0040] The high-temperature and high-pressure pipe 310 is specifically a bimetallic bellows structure (inner layer 316L stainless steel, outer layer copper-nickel alloy), with both ends connected to the high-temperature joint 210 and the piston pressure gauge 320 respectively.

[0041] A cooling jacket is provided outside the high-temperature and high-pressure pipe 310 , which can specifically cover the middle section of the high-temperature and high-pressure pipe 310 and circulate cooling water through it. This can isolate the high temperature and prevent it from being transmitted to the piston pressure gauge 320 , thereby affecting the operation of the piston pressure gauge 320 .

[0042] In this way, the application can be divided into a high temperature area and a normal temperature area by the cooling jacket:

[0043] High temperature area (high temperature connector 210 + sensor to be tested): can maintain a constant temperature of 300℃;

[0044] Normal temperature zone (piston pressure gauge): can maintain 25℃±1℃.

[0045] It solves the pain point that existing standard pressure gauges cannot withstand high temperatures, and has a very simple structure.

[0046] The piston pressure gauge 320 specifically includes a weight 321, a weight tray 322, a measuring piston 323, a piston cylinder 324, a shut-off valve 325, a working fluid 326, a working piston 327, a hand pump 328, a screw 329 and a pressurizing handwheel 500. The working fluid 326 and the working piston 327 are located in the piston cylinder 324. The pressurizing handwheel 500 is connected to the working piston 327 through the screw 329. The measuring piston 323 is connected to the piston cylinder 324. The weight tray 322 is connected to the measuring piston 323. The weight 321 is provided on the weight tray 322. The shut-off valve 325 is set on the piston cylinder 324. The piston cylinder 324 is connected to the high-temperature and high-pressure pipe 310.

[0047] The working process of this application is as follows:

[0048] When testing is required, first turn on the switch power supply 130 so that the temperature control instrument 111 can start working. Connect the two ends of the K-type thermocouple 112 to T1+ and T1- on the temperature control instrument 111 respectively. Then place the heating plate 121 on the high-temperature heating platform 122 and fix it to prevent it from falling off. Then connect the sensor to be tested 400 to the high-temperature interface of the high-temperature and high-pressure pipe 310. Place a certain weight 321 on the weight tray 322 to apply pressure to the piston pressure gauge 320, and screw on the shut-off valve 325. Then rotate the pressurizing handwheel 500 to push the screw rod. 329 contracts inwards and squeezes the internal working fluid 326 to move upward, so that the piston pressure gauge 320 maintains a fully loaded working state, and then uses the probe of the temperature sensor to detect the temperature of the sensor to be tested 400. If the detected temperature is lower than the temperature set on the temperature control instrument 111, the temperature control instrument 111 controls the heating plate 121 to start working and start heating; when the detected temperature is greater than or equal to the temperature set on the temperature control instrument 111, the temperature control instrument 111 controls the high temperature alarm 140 to start an alarm and controls the heating plate 121 to stop working.

[0049] In this way, the present application directly physically connects the sensor to be tested 400 (such as a high-temperature melt pressure sensor or a high-temperature pressure transmitter) through the high-temperature joint 210, heats it to 300°C and maintains a constant temperature, and then connects the high-temperature joint 210 to the piston pressure gauge 320 with a high-temperature and high-pressure pipe 310, and uses the piston pressure gauge 320 to measure the performance of the sensor to be tested 400 at high temperature.

[0050] Since high-temperature melt pressure sensors and high-temperature pressure transmitters are generally used to measure the pressure of polymer materials during processing and to achieve closed-loop automated control of production. Generally, polymer materials are at high temperatures during processing, so the probes of high-temperature melt pressure sensors and high-temperature pressure transmitters that measure pressure must be able to withstand high temperatures and accurately measure pressure. At this time, a set of devices that can test the performance of high-temperature melt pressure sensors and high-temperature pressure transmitters under high temperature and high pressure is needed. Although there are related detection devices at present, the structure is relatively complex. This application realizes high-temperature and high-pressure testing and helps companies analyze and improve the structure of melt pressure sensors. Through temperature compensation, improved structure, improved raw materials, and improved processes, high-temperature melt pressure sensors and high-temperature pressure transmitters are more stable and more accurate in high-temperature and high-pressure environments. The overall structure is very simple, the cost of use is low, and the measurement results are also very accurate.

[0051] In addition, the present application realizes fully closed-loop temperature control, with a wide operating temperature range (50-500°C) and a temperature control accuracy of ±0.5°C, which greatly improves the detection accuracy.

[0052] Based on the above detection device, the present application also provides a detection method for a high-temperature melt pressure sensor and a high-temperature pressure transmitter, comprising the following steps:

[0053] Install the high-temperature melt pressure sensor or high-temperature pressure transmitter on the high-temperature joint 210 as required and confirm that it is well sealed;

[0054] Turn on the power switch, set the target temperature on the temperature control instrument 311, and control the heating plate 121 to start heating;

[0055] Place the weight 321 on the weight tray 322 to apply pressure, and turn the pressure hand wheel 500 to start pressurizing the high-temperature melt pressure sensor or high-temperature pressure transmitter;

[0056] The temperature sensor probe is brought into contact with the high-temperature melt pressure sensor or the high-temperature pressure transmitter, and the temperature control instrument 311 receives feedback data from the temperature sensor in real time;

[0057] The temperature control instrument 311 calculates the error, and when the error is greater than 0, controls the heating plate 121 to continue heating, and when the error is less than 0, stops heating and maintains the temperature at the set temperature, with an error accuracy of ±0.5;

[0058] Record data and stop testing.

[0059] Furthermore, in order to further improve the detection accuracy, the present application also provides a dynamic pressure calibration method for the piston pressure gauge 320:

[0060] Step 1: Keep the temperature at 300℃ for 30 minutes or more to eliminate thermal stress.

[0061] Step 2: Use the piston pressure gauge to increase the pressure in steps of 320° (0 to 200 MPa).

[0062] Step 3: Record the temperature sensor output signal and the pressure gauge standard value in real time;

[0063] Step 4: Calculate the linearity / hysteresis / repeatability errors at high temperature.

[0064] The following is the test data of a high-temperature melt pressure sensor tested at a constant temperature of 300°C in this application:

[0065]

[0066] The high temperature linear error is ≤0.3%, verifying the effectiveness of the device.

[0067] This application solves the problem of thermal interference between a high-temperature environment and a room-temperature dynamic pressure source through a device and method based on the concept of "constant temperature coupling" and the above-mentioned constant temperature coupling detection device. It can achieve accurate, reliable and comprehensive detection and evaluation of the dynamic performance (response speed, frequency bandwidth, transient characteristics, etc.) of high-temperature pressure sensors under conditions simulating real high-temperature melt working conditions, which is of great significance for improving the performance and quality control of high-temperature melt pressure sensors and high-temperature pressure transmitters. It is particularly suitable for factory calibration and periodic verification of high-temperature resistant pressure sensors, high-temperature melt pressure sensors and high-temperature pressure transmitters in the fields of chemical fiber, plastic machinery, chemical reactors, high-temperature melt pressure sensors and high-temperature pressure transmitter manufacturers.

[0068] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A performance detection device for high temperature and melt sensors based on constant temperature coupling, characterized in that: It includes a constant temperature coupling module, a sensor mounting structure to be tested and a pressure conduction module. The sensor mounting structure to be tested is connected to the sensor to be tested and measures the temperature in real time. The constant temperature coupling module is connected to the sensor mounting structure to be tested and is used to heat the sensor to be tested at a constant temperature. The pressure conduction module is connected to the sensor mounting structure to be tested and is used to deliver pressure to pressurize the sensor to be tested on the sensor mounting structure to be tested.

2. A performance detection device for high temperature and melt sensors based on constant temperature coupling according to claim 1, characterized in that: The sensor to be tested installation structure is a high-temperature joint, a temperature sensor is embedded in the high-temperature joint, and the sensor to be tested is connected to the high-temperature joint.

3. The performance detection device of a high temperature and melt sensor based on constant temperature coupling according to claim 2, characterized in that: One end of the high-temperature joint is provided with a thread corresponding to the sensor to be tested. The sensor to be tested is installed on the top of the high-temperature joint through thread sealing. The probe of the sensor to be tested directly extends into the internal cavity of the high-temperature joint and is connected to the temperature sensor embedded in the high-temperature joint.

4. The performance detection device of a high temperature and melt sensor based on constant temperature coupling according to claim 3 is characterized in that: There are multiple high-temperature joints, and each high-temperature joint is connected to a sensor to be tested.

5. The performance detection device of a high temperature and melt sensor based on constant temperature coupling according to claim 1, characterized in that: The constant temperature coupling module includes a temperature control unit, a heating unit, a switching power supply and a high temperature alarm. The heating unit is connected to the mounting structure of the sensor to be tested to heat the mounting structure of the sensor to be tested. The temperature control unit is respectively connected to the heating unit and the mounting structure of the sensor to be tested. The switching power supply is respectively connected to the temperature control unit and the heating unit. The high temperature alarm is connected to the temperature control unit.

6. The performance detection device of a high temperature and melt sensor based on constant temperature coupling according to claim 5, characterized in that: The temperature control unit includes a temperature control instrument, a K-type thermocouple, a rotary switch, a circuit breaker, a DC ammeter and a solid-state relay. The temperature control instrument is respectively connected to the K-type thermocouple, the high temperature alarm and the switching power supply, the rotary switch is connected to the switching power supply, the circuit breaker is connected to the rotary switch, the DC ammeter is respectively connected to the circuit breaker and the heating unit, and the solid-state relay is respectively connected to the heating unit and the temperature control instrument.

7. The performance detection device of a high temperature and melt sensor based on constant temperature coupling according to claim 6, characterized in that: The heating unit includes a plurality of heating plates, and the number of the DC ammeters and the solid-state relays is the same as the number of the heating plates.

8. The performance detection device of a high temperature and melt sensor based on constant temperature coupling according to claim 2, characterized in that: The pressure conduction module includes a high-temperature and high-pressure tube and a piston pressure gauge. The high-temperature and high-pressure tube is connected to the mounting structure of the sensor to be tested, the high-temperature and high-pressure tube is connected to the other end of the high-temperature joint, and the piston pressure gauge is connected to the high-temperature and high-pressure tube.

9. The performance detection device of a high temperature and melt sensor based on constant temperature coupling according to claim 8, characterized in that: A cooling jacket is provided outside the high-temperature and high-pressure pipe.

10. The performance detection device of a high temperature and melt sensor based on constant temperature coupling according to claim 8, characterized in that: The piston pressure gauge includes a weight, a weight tray, a measuring piston, a piston cylinder, a shut-off valve, a working fluid, a working piston, a hand pump, a screw and a pressurizing handwheel. The working fluid and the working piston are located in the piston cylinder. The pressurizing handwheel is connected to the working piston through a screw, the measuring piston is connected to the piston cylinder, the weight tray is connected to the measuring piston, a weight is provided on the weight tray, the shut-off valve is arranged on the piston cylinder, and the piston cylinder is connected to the high-temperature and high-pressure pipe.

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