CN117629787A - Device and method for regulating and controlling surface temperature of sample - Google Patents

Device and method for regulating and controlling surface temperature of sample Download PDF

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Publication number
CN117629787A
CN117629787A CN202311371712.XA CN202311371712A CN117629787A CN 117629787 A CN117629787 A CN 117629787A CN 202311371712 A CN202311371712 A CN 202311371712A CN 117629787 A CN117629787 A CN 117629787A
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China
Prior art keywords
sample
cold air
nozzle
channel
air supply
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Pending
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CN202311371712.XA
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Chinese (zh)
Inventor
蔡振
梅金娜
赵天飞
何季华
杭玉桦
朱斌
蒋振兴
任戌秋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Science And Technology Innovation Center Of Northwest University Of Technology
Hangzhou Jiazhen Ultrasonic Technology Co ltd
Suzhou Nuclear Power Research Institute Co Ltd
Original Assignee
Chongqing Science And Technology Innovation Center Of Northwest University Of Technology
Hangzhou Jiazhen Ultrasonic Technology Co ltd
Suzhou Nuclear Power Research Institute Co Ltd
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Application filed by Chongqing Science And Technology Innovation Center Of Northwest University Of Technology, Hangzhou Jiazhen Ultrasonic Technology Co ltd, Suzhou Nuclear Power Research Institute Co Ltd filed Critical Chongqing Science And Technology Innovation Center Of Northwest University Of Technology
Priority to CN202311371712.XA priority Critical patent/CN117629787A/en
Publication of CN117629787A publication Critical patent/CN117629787A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0005—Repeated or cyclic
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0055—Generation of the force using mechanical waves, e.g. acoustic
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/0202—Control of the test
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0228—Low temperature; Cooling means

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a regulating and controlling device and a regulating and controlling method for the surface temperature of a sample, wherein the regulating and controlling device comprises a cold air supply box, a cold air conveying component, a nozzle and an ultrasonic fatigue loading module, the sample is connected with the ultrasonic fatigue loading module, a first channel and a second channel which penetrate through the nozzle in the height direction are arranged in the nozzle, the sample penetrates through the first channel, a gauge length section of the sample is positioned below the nozzle, the second channel is used for supplying cold air to pass through, one end of the cold air conveying component is connected with the cold air supply box, and the other end of the cold air conveying component is connected with the top of the second channel; the measuring end of the thermocouple is sleeved on the periphery of the gauge length section. The device and the method for regulating and controlling the surface temperature of the sample can generate high-speed gas jet flow along the axial direction of the sample, blow cold air to the sample, generate negative pressure to take away air around the sample, cool the sample gauge length section, reduce the stress influence on the sample gauge length section and ensure the accuracy of a test result.

Description

Device and method for regulating and controlling surface temperature of sample
Technical Field
The invention belongs to the technical field of sample surface temperature regulation and control, and particularly relates to a sample surface temperature regulation and control device and a method for regulating and controlling the sample surface temperature by adopting the same.
Background
Fatigue loads are high frequency loads to which the main components of many fields of engineering are subjected. In the fatigue fracture process, the initiation and the expansion of the fatigue crack have certain concealment, the components often do not generate obvious plastic deformation in the fatigue fracture process, catastrophic accidents are easy to cause, the life safety of people is endangered, and social property loss is caused, so that the research about the fatigue fracture is always a research hot spot in academic circles.
Conventional fatigue fracture studies typically divide fatigue into low cycle fatigue and high cycle fatigue, depending on the load cycle experienced by the material. The number of test cycles for high cycle fatigue is generally limited to 10 due to objective limitations of test conditions and equipment 7 The following times. However, with the continued development of material research and the increasing academic knowledge of fatigue fracture behavior of materials, many materials were found to face higher cycles (10 9 More than once). In order to study fatigue fracture behavior for higher cycles, ultrasonic fatigue test methods are proposed in academia. The test method can be used forGenerates a loading frequency of tens KHz, realizes ultra-high frequency fatigue, greatly shortens test time and leads to 10 9 The cycle fatigue test can be completed in tens of hours.
However, the ultrahigh frequency fatigue test has the following technical problems: the temperature of the sample gauge length section can be continuously increased due to the influence of high-frequency vibration, and if the temperature is not subjected to cold cutting, the temperature can reach hundreds of degrees centigrade, so that the accuracy of a test result is influenced. At present, the industry adopts a cold air direct blowing mode to dissipate heat of a sample gauge length section, namely a cold air nozzle is aligned to the sample gauge length section, and the area is directly purged to take away heat generated by a sample in the ultra-high frequency fatigue process, so that the purpose of cooling the sample is achieved. However, this cooling method has problems in that: the impact of direct blowing of cold air can generate stress on the sample gauge length section, so that the stress state of the sample gauge length section in the ultra-high frequency fatigue process is changed, and the accuracy of a test result is further affected. Moreover, the impact of the direct blowing of the cold air is more obvious for small-size samples.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art, the invention aims to provide a device and a method for regulating and controlling the surface temperature of a sample, which can generate high-speed gas jet flow along the axial direction of the sample around a sample gauge length section, so as to realize cooling of the sample gauge length section and reduce the stress influence on the sample gauge length section.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention aims to provide a regulating and controlling device for the surface temperature of a sample, wherein the sample comprises a gauge length section, and comprises a cold air supply box, a cold air conveying assembly, a nozzle and an ultrasonic fatigue loading module, the sample is connected with the ultrasonic fatigue loading module, a first channel and a second channel which penetrate through the sample in the height direction are arranged in the nozzle, the sample penetrates through the first channel, the gauge length section is positioned below the nozzle, the second channel is used for allowing cold air to pass through, one end of the cold air conveying assembly is connected with the cold air supply box, the other end of the cold air conveying assembly is connected with the top of the second channel, and the nozzle is used for blowing cold air conveyed into the second channel by the cold air conveying assembly to the gauge length section along the axial direction of the sample; and the measuring end of the thermocouple is sleeved on the periphery of the gauge length section. The design of the first channel on the nozzle is convenient for the sample to pass through, in addition, the ultrasonic fatigue loading module is used for carrying out fatigue loading on the sample, the ultrasonic fatigue loading module comprises an amplitude transformer, the top of the sample is connected with the bottom of the amplitude transformer, and the amplitude transformer and the sample can pass through the first channel of the nozzle and the sample is positioned below the nozzle.
Through setting up the nozzle, make cold wind flow along the second passageway in the nozzle and produce along the axial high-speed gas jet of sample around the gauge length section of sample to produce the negative pressure around the sample gauge length section, with taking away the air near the sample gauge length section, realize the cooling to the sample gauge length section, avoid the stress influence that the mode cooling sample produced it with cold wind directly blows. The regulating and controlling device can keep the temperature of the gauge length section of the sample within the range of room temperature to 100 ℃ all the time through regulation and control, and can avoid the influence of the continuous rise of the temperature of the gauge length section of the sample due to the influence of high-frequency vibration on the test result.
According to some preferred embodiments of the present invention, the cold air delivery assembly includes an air supply pipe and an air inlet pipe, one end of the air supply pipe is connected to the cold air supply box, the other end of the air supply pipe is connected to the air inlet pipe, and one end of the air inlet pipe away from the air supply pipe is connected to the top of the second channel; and one end of the thermocouple, which is far away from the sample, is connected with the cold air supply box. The cold air supply box flows cold air to the air supply pipeline, then flows to the air inlet pipe orifice from the air supply pipeline, flows to the second channel of the nozzle from the air inlet pipe orifice, and finally is sprayed to the sample from the bottom of the nozzle.
According to some preferred embodiments of the present invention, a plurality of air supply pipelines are arranged in parallel, each air supply pipeline is further provided with a regulating valve, and the number of air inlet nozzles is equal to the number of air supply pipelines; the air inlet pipe orifices are uniformly distributed at intervals along the circumference of the top end of the second channel, the shape of the air inlet pipe orifices is in a round table shape, and the inner diameter of the air inlet pipe orifices is gradually increased from the top end to the bottom end. The regulating valve is used for regulating the air quantity circulated by the air supply pipelines, and guaranteeing that the air quantity flowing to the nozzles of each air supply pipeline is the same.
According to some preferred embodiments of the invention, the nozzle comprises an inner tube and a housing, the housing being located outside the inner tube, the center of the inner tube being located on the same vertical line as the center of the housing; the shell is in a truncated cone shape, and the inner diameter of the shell is gradually reduced from the top end to the bottom end of the shell; the shape of the inner pipe fitting is cylindrical, and the inner diameter of the inner pipe fitting is smaller than the inner diameter of the bottom end of the shell.
According to some preferred embodiments of the present invention, the height of the first channel and the second channel are equal to the height of the nozzle, the diameter of the first channel is equal to the inner diameter of the inner pipe, the second channel is formed by the outer wall of the inner pipe and the inner wall of the shell together, and the cross-sectional area of the second channel gradually decreases from the top to the bottom. The shell that sets up round platform form, and the internal diameter of shell reduces gradually from its top to the bottom, guarantees that the cross-sectional area of second passageway reduces gradually from its top to the bottom, when making cold wind circulate in the second passageway, when the bottom of flow to the second passageway, can outwards produce high-speed gas jet, the pressure of second passageway bottom is high to guarantee to take away the normal pressure air around the sample gauge length section, in order to cool off the sample.
According to some preferred embodiments of the invention, the distance between the top end of the gauge length and the bottom end of the nozzle is 5-10 mm, the center of the sample and the center of the nozzle being on the same vertical line. The distance between the sample and the bottom end of the nozzle is ensured to be proper, and the high-speed gas jet can take away the air around the sample.
According to some preferred embodiments of the present invention, the ultrasonic fatigue loading device further comprises a frame and a diversion part, wherein the top of the ultrasonic fatigue loading module is fixedly connected with the top of the frame, the bottom surface of the diversion part is fixedly connected with the bottom of the frame, and the diversion part is positioned below the gauge length section. The frame is used for providing support for the ultrasonic fatigue loading module, namely the flow guide part. The flow guiding part is positioned under the nozzle, and when the axial high-speed gas jet reaches the flow guiding part, the gas can flow out to the periphery under the flow guiding effect of the flow guiding part, so that the gas is prevented from being detained near the sample.
According to some preferred embodiments of the invention, the distance from the bottom end of the gauge length to the top end of the flow guiding part is 5-20 mm, and the center of the flow guiding part and the center of the nozzle are located on the same vertical line.
According to some preferred embodiments of the present invention, the area of the top surface of the flow guiding part is larger than the area of the bottom surface, and the bus bar of the flow guiding part is a concave arc. The side of the flow guiding part is in streamline design, so that better flow guiding effect on gas can be achieved.
Another object of the present invention is to provide a method for controlling the surface temperature of a sample, using the controlling apparatus as described above, the method comprising the steps of:
after the sample is mounted on the ultrasonic fatigue loading module, starting an ultrahigh-frequency fatigue test, starting a cold air supply box, and adjusting the temperature and/or the air speed of cold air conveyed by the cold air conveying assembly according to the temperature of the sample in the sample gauge length section fed back by the thermocouple so that the temperature of the gauge length section of the sample is between room temperature and 100 ℃. In some embodiments of the present invention, the specific method for controlling the surface temperature of the sample by using the control device is as follows:
step 1: the test specimen was mounted to an ultrasonic fatigue loading module.
Step 2: and starting the ultrasonic fatigue loading module to start an ultrahigh frequency fatigue test on the sample.
Step 3: and starting the cold air supply box, and rotating the regulating valve to enable the air quantity of the cold air flowing in the air supply pipelines to be consistent.
Step 4: and (3) according to the temperature of the sample fed back to the cold air supply box and monitored in real time by the thermocouple, regulating the temperature and/or the air speed of the cold air, so that the temperature of the sample is controlled within the range of room temperature to 100 ℃.
Step 5: and after the sample is in fatigue failure, sequentially closing the cold air supply box and the ultrasonic fatigue loading module, and taking down the sample.
Compared with the prior art, the device and the method for regulating and controlling the surface temperature of the sample can generate high-speed gas jet flow along the axial direction of the sample around the sample gauge length section, blow cold air to the sample, generate negative pressure to take away air around the sample, realize cooling of the sample gauge length section, and reduce stress influence on the sample gauge length section, thereby ensuring accuracy of test results.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a control device according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a front view of a control device according to a first embodiment of the present invention;
FIG. 3 is an enlarged partial view of the portion A in FIG. 2;
FIG. 4 is a schematic perspective view of a nozzle of a regulating device according to an embodiment of the invention;
FIG. 5 is a schematic cross-sectional view of a nozzle of a regulating device according to a first embodiment of the present invention;
wherein, the reference numerals are as follows: the ultrasonic fatigue loading device comprises a frame-1, an ultrasonic fatigue loading module-2, a nozzle-3, a first channel-31, a second channel-32, an inner pipe fitting-33, a shell-34, a cold air supply box-4, a cold air conveying component-5, an air supply pipeline-51, an air inlet pipe orifice-52, an adjusting valve-53, a thermocouple-6, a flow guiding part-7, a sample-8 and a gauge length section-81.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example one sample surface temperature control device
Referring to fig. 1 to 5, the embodiment provides a device for regulating and controlling the surface temperature of a sample, which comprises a frame 1, an ultrasonic fatigue loading module 2, a nozzle 3, a cold air supply box 4, a cold air conveying component 5, a thermocouple 6 and a flow guiding part 7, wherein the top of the ultrasonic fatigue loading module 2 is fixedly connected with the top of the frame 1, and the bottom of the flow guiding part 7 is fixedly connected with the bottom of the frame 1. The sample 8 comprises a gauge length section 81, and the sample 8 is connected with the amplitude transformer of the ultrasonic fatigue loading module 2 so that the ultrasonic fatigue loading module 2 performs a fatigue loading test on the sample 8; one end of the cold air conveying component 5 is connected with the cold air supply box 4, the other end of the cold air conveying component 5 is connected with the nozzle 3, the sample 8 and the amplitude transformer penetrate through the nozzle 3 and are located below the nozzle 3, and the flow guide part 7 is located below the sample 8. The measuring end of the thermocouple 6 is sleeved on the periphery of the gauge length section 81 of the sample 8 to measure the real-time temperature of the sample 8 in the test process, and one end, away from the sample 8, of the thermocouple 6 is connected with the cold air supply box 4 to feed back the temperature of the gauge length section 81 of the sample 8 to the cold air supply box 4.
Further, as shown in fig. 4 and 5, a first channel 31 and a second channel 32 penetrating the nozzle 3 in the height direction are provided inside the nozzle 3, the heights of the first channel 31 and the second channel 32 are equal to the height of the nozzle 3, the first channel 31 is used for allowing the sample 8 and the amplitude transformer connected with the sample to pass through, and the second channel 32 is used for allowing cold air to pass through. Further, the nozzle 3 includes an inner pipe 33 and a housing 34, the housing 34 being located outside the inner pipe 33, the center of the inner pipe 33 being located on the same vertical line as the center of the housing 34. The shape of the shell 34 is a truncated cone shape, and the inner diameter of the shell 34 gradually decreases from the top end to the bottom end; the inner tube 33 is cylindrical in shape, and the inner diameter of the inner tube 33 is smaller than the inner diameter of the bottom end of the housing 34.
The diameter of the first channel 31 is equal to the inner diameter of the inner pipe 33, the second channel 32 is formed by the outer wall of the inner pipe 33 and the inner wall of the shell 34, and the cross section area of the second channel 32 is gradually reduced from top to bottom, so that when cold air flows from top to bottom in the second channel 32, high-speed gas jet flow can be further generated outwards along the axial direction of the sample 8, the pressure at the bottom end of the second channel 32 is high, and the normal pressure air around the gauge section 81 of the sample 8 is guaranteed to be taken away, so that the sample 8 is cooled. The center of the sample 8 and the center of the nozzle 3 are positioned on the same vertical line, the distance from the top end of the gauge length section 81 of the sample 8 to the bottom end of the nozzle 3 after the sample 8 passes through the first channel 31 is 5-10 mm, the proper distance between the sample 8 and the bottom end of the nozzle 3 is ensured, and the high-speed gas jet can take away the air around the sample 8.
Further, as shown in fig. 1 and 2, in the present embodiment, the cold air delivery assembly 5 includes four air supply ducts 51 and four air intake nozzles 52, and the four air intake nozzles 52 are uniformly spaced apart in the circumferential direction of the top end of the second passage 32. One end of the air supply duct 51 is connected and communicated with the cold air supply box 4, the other end of the air supply duct 51 is connected and communicated with the air inlet pipe orifice 52, and the bottom surface of the air inlet pipe orifice 52 away from the one end of the air supply duct 51 corresponds to the top surface of the second channel 32 and is connected with the housing 34 of the nozzle 3 and the top of the inner pipe 33. The air inlet pipe mouth 52 is shaped like a truncated cone, and the inner diameter of the air inlet pipe mouth 52 gradually increases from the top to the bottom. The cold air supply box 4 flows cold air to the air supply pipeline 51, then flows to the air inlet pipe mouth 52 from the air supply pipeline 51, flows to the second channel 32 of the nozzle 3 from the air inlet pipe mouth 52, and finally is sprayed to the sample 8 from the bottom of the nozzle 3. Each air supply duct 51 is further provided with a regulating valve 53 for regulating the amount of cold air to ensure the same amount of air flowing from each air supply duct 51 to the nozzle 3.
As shown in fig. 1 to 3, the distance from the bottom end of the gauge length section 81 to the top end of the lower guide portion 7 is 5 to 20mm, and the center of the guide portion 7 and the center of the nozzle 3 are also located on the same vertical line. In order to flow out the gas flowing around the sample 8 to avoid stagnation near the sample, the side surface of the flow guiding part 7 is designed to be streamline, specifically, the area of the top surface of the flow guiding part 7 is larger than that of the bottom surface, and the bus of the flow guiding part 7 is an inward concave arc line so as to play a better role in guiding flow.
The second embodiment adopts the method for regulating and controlling the surface temperature of the sample by the regulating and controlling device in the first embodiment, and mainly comprises the following steps:
step 1: the test specimen 8 is mounted on the ultrasonic fatigue loading module 2.
Step 2: the ultrasonic fatigue loading module 2 is started to start the ultra-high frequency fatigue test on the sample 8.
Step 3: the cold air supply box 4 is started, and the rotation regulating valve 53 regulates the amount of cold air flowing through each air supply duct 51 so that the amount of cold air flowing from each air supply duct 51 to the nozzle 3 is uniform.
Step 4: according to the temperature of the sample 8 which is fed back to the cold air supply box 4 and monitored in real time by the thermocouple 6, the temperature and/or the wind speed of the cold air are adjusted, so that the temperature of the sample 8 is controlled within the range of room temperature to 100 ℃.
Step 5: after the sample 8 is in fatigue failure, the cold air supply box 4 and the ultrasonic fatigue loading module 2 are sequentially closed, and the sample 8 is taken down.
According to the device and the method for regulating and controlling the surface temperature of the sample, high-speed gas jet flow along the axial direction of the sample can be generated around the sample gauge length section, cold air is blown to the sample, negative pressure is generated to take away air around the sample, the stress influence on the sample gauge length section is reduced while the sample gauge length section is cooled, and therefore accuracy of a test result is guaranteed.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims (10)

1. The device is characterized by comprising a cold air supply box, a cold air conveying assembly, a nozzle and an ultrasonic fatigue loading module, wherein the sample is connected with the ultrasonic fatigue loading module, a first channel and a second channel penetrating through the ultrasonic fatigue loading module in the height direction are arranged in the nozzle, the sample penetrates through the first channel, the gauge length is positioned below the nozzle, the second channel is used for supplying cold air to pass through, one end of the cold air conveying assembly is connected with the cold air supply box, the other end of the cold air conveying assembly is connected with the top of the second channel, and the nozzle is used for blowing the cold air conveyed into the second channel by the cold air conveying assembly to the gauge length along the axial direction of the sample; and the measuring end of the thermocouple is sleeved on the periphery of the gauge length section.
2. The regulating and controlling device according to claim 1, wherein the cold air conveying assembly comprises an air supply pipeline and an air inlet pipe orifice, one end of the air supply pipeline is connected with the cold air supply box, the other end of the air supply pipeline is connected with the air inlet pipe orifice, and one end of the air inlet pipe orifice, which is far away from the air supply pipeline, is connected with the top of the second channel; and one end of the thermocouple, which is far away from the sample, is connected with the cold air supply box.
3. The regulating and controlling device according to claim 2, wherein a plurality of air supply pipelines are arranged in parallel, each air supply pipeline is further provided with a regulating valve, and the number of air inlet nozzles is equal to the number of air supply pipelines; the air inlet pipe orifices are uniformly distributed at intervals along the circumference of the top end of the second channel, the shape of the air inlet pipe orifices is in a round table shape, and the inner diameter of the air inlet pipe orifices is gradually increased from the top end to the bottom end.
4. The regulating device according to claim 1, wherein the nozzle comprises an inner tube and a housing, the housing being located outside the inner tube, the center of the inner tube being located on the same vertical line as the center of the housing; the shell is in a truncated cone shape, and the inner diameter of the shell is gradually reduced from the top end to the bottom end of the shell; the shape of the inner pipe fitting is cylindrical, and the inner diameter of the inner pipe fitting is smaller than the inner diameter of the bottom end of the shell.
5. The control device according to claim 4, wherein the first passage and the second passage are each equal in height to the nozzle, the first passage is equal in diameter to the inner diameter of the inner pipe member, the second passage is formed by the outer wall of the inner pipe member and the inner wall of the housing together, and the cross-sectional area of the second passage is gradually reduced from the top to the bottom thereof.
6. The regulating device according to claim 1, wherein the distance from the top end of the gauge length to the bottom end of the nozzle is 5-10 mm, and the center of the sample and the center of the nozzle are located on the same vertical line.
7. The control device of claim 1, further comprising a frame and a deflector, wherein the top of the ultrasonic fatigue loading module is fixedly connected with the top of the frame, the bottom of the deflector is fixedly connected with the bottom of the frame, and the deflector is positioned below the gauge length section.
8. The regulating device according to claim 7, wherein the distance from the bottom end of the gauge length to the top end of the flow guiding part is 5-20 mm, and the center of the flow guiding part and the center of the nozzle are located on the same vertical line.
9. The control device of claim 7, wherein the flow guiding portion has a top surface with an area greater than an area of the bottom surface, and the flow guiding portion has a concave arc.
10. A method for controlling the surface temperature of a sample, characterized in that the surface temperature of the sample is controlled by using the control device according to any one of claims 1 to 9, the control method comprising the steps of:
after the sample is mounted on the ultrasonic fatigue loading module, starting an ultrahigh-frequency fatigue test, starting a cold air supply box, and adjusting the temperature and/or the air speed of cold air conveyed by the cold air conveying assembly according to the temperature of the sample in the sample gauge length section fed back by the thermocouple so that the temperature of the gauge length section of the sample is between room temperature and 100 ℃.
CN202311371712.XA 2023-10-23 2023-10-23 Device and method for regulating and controlling surface temperature of sample Pending CN117629787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311371712.XA CN117629787A (en) 2023-10-23 2023-10-23 Device and method for regulating and controlling surface temperature of sample

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311371712.XA CN117629787A (en) 2023-10-23 2023-10-23 Device and method for regulating and controlling surface temperature of sample

Publications (1)

Publication Number Publication Date
CN117629787A true CN117629787A (en) 2024-03-01

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Application Number Title Priority Date Filing Date
CN202311371712.XA Pending CN117629787A (en) 2023-10-23 2023-10-23 Device and method for regulating and controlling surface temperature of sample

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Country Link
CN (1) CN117629787A (en)

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