CN111420717A - High-low temperature test box capable of changing temperature rapidly and used for dual-temperature-zone thermal mechanical fatigue test - Google Patents
High-low temperature test box capable of changing temperature rapidly and used for dual-temperature-zone thermal mechanical fatigue test Download PDFInfo
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- CN111420717A CN111420717A CN202010304952.8A CN202010304952A CN111420717A CN 111420717 A CN111420717 A CN 111420717A CN 202010304952 A CN202010304952 A CN 202010304952A CN 111420717 A CN111420717 A CN 111420717A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L1/00—Enclosures; Chambers
- B01L1/02—Air-pressure chambers; Air-locks therefor
- B01L1/025—Environmental chambers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
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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
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Abstract
The invention relates to a high-low temperature test box for a double-temperature-zone thermal mechanical fatigue test capable of changing temperature rapidly, which is used for the thermal mechanical fatigue test of a glass transparent piece, wherein a box body (1) is arranged on a mechanical fatigue testing machine, a fatigue test piece (2) passes through the upper end surface and the lower end surface of the box body (1) and is clamped between an upper clamp and a lower clamp of the mechanical fatigue testing machine, and the high-low temperature test box is characterized in that: a clapboard (3) is arranged in a test box (7) in a box body (1) to divide the space in the test box (7) into two independent temperature intervals (4), so that a transition surface and an opposite surface of a fatigue sample (2) are respectively positioned in the two independent temperature intervals (4); the two independent temperature intervals (4) are sealed intervals. The problem of current fatigue test machine high low temperature test box alternating temperature rate slow, can only provide single test temperature district is solved.
Description
Technical Field
The invention relates to a high-low temperature test box for a double-temperature-zone thermal mechanical fatigue test capable of changing temperature rapidly, belonging to the structure technology of products.
Background
The high-low temperature test chamber has double functions of heating and refrigerating, is generally used for a fatigue testing machine, and has the high-low temperature realization mode that liquid nitrogen or dry ice is injected into a built-in heating wire and an interlayer to perform slow temperature change and maintain a single test temperature environment except that the mechanical structure of the chamber body is matched with the fatigue testing machine.
The high-low temperature test box structure mainly comprises a control system, a refrigerating system, a heating system, a temperature monitoring system and an air circulating system. The control system determines important indexes of the test box such as temperature rise rate, temperature control precision, test program control and the like. The controllers mostly use PID control as the main control, and a small part of the controllers also use a control mode combining PID and fuzzy control. The refrigerating system is one of the key parts of the high-low temperature test chamber, and the refrigerating mode of the test chamber can be generally divided into mechanical refrigeration and liquid nitrogen or dry ice assisted refrigeration. The mechanical refrigeration is vapor compression refrigeration, which mainly comprises a compressor, a condenser, a throttling mechanism and an evaporator, and single-stage compressor refrigeration or double-stage compressor refrigeration can be selected according to the low-temperature requirement of the test temperature, so that the refrigeration mode of the comprehensive test box generally adopts cascade refrigeration. The liquid nitrogen refrigeration mainly utilizes the principle that the liquid nitrogen absorbs a large amount of heat when changing from a liquid state to a gas state to realize rapid temperature reduction. In the practical application process, liquid nitrogen refrigeration is usually used as mechanical refrigeration supplement of a compressor, for example, liquid nitrogen spray is adopted as supplement in a rapid temperature change test box to realize the effect of rapid temperature reduction. The heating system of the high-low temperature test box mainly comprises a high-power resistance wire, and if the temperature rise rate required by the test box is high, enough power of the heating system needs to be configured. The temperature monitoring of the high-low temperature test box mainly depends on a temperature sensor, and the temperature in the box is sensed by the sensor to transmit a real-time signal to a control system, so that the preset temperature is reached. The temperature sensor is largely applied to PT100 and a thermocouple. The air circulation system is generally composed of a centrifugal fan and a motor for driving the centrifugal fan to operate. It provides circulation of air within the test chamber.
Disclosure of Invention
The invention provides a high-low temperature test box for a double-temperature-zone thermal mechanical fatigue test, which can change temperature rapidly aiming at the defects in the prior art, and aims to solve the problem that the high-low temperature test box for the existing fatigue test machine is low in temperature change rate and only can provide a single test temperature zone.
The purpose of the invention is realized by the following technical scheme:
this kind of but high low temperature test box for dual temperature district thermal mechanical fatigue test of rapid temperature change for the thermal mechanical fatigue test of glass transparency, its box 1 installs on mechanical fatigue test machine, and fatigue sample 2 passes the upper and lower terminal surface of box 1 and centre gripping between the upper and lower anchor clamps of mechanical fatigue test machine, its characterized in that: a partition plate 3 is arranged in a test box 7 in the box body 1 to divide the space in the test box 7 into two independent temperature intervals 4, so that the transition surface and the opposite surface of the fatigue sample 2 are respectively positioned in the two independent temperature intervals 4; the two independent temperature zones 4 are sealed zones.
In one implementation, the upper end surface and the lower end surface of one side of the box door 5 of the box body 1 are provided with detachable mounting blocks 6 which provide passages for the fatigue test sample 2 to enter and exit the box body 1.
In one implementation, a sealing block 8 made of polytetrafluoroethylene material is arranged at the opening of the fatigue test specimen 2 penetrating through the test chamber 7 in the box body 1 and is fixed by a clamp 9.
In one implementation, stirring fans 12 are arranged in two independent temperature intervals 4 in the test box 7 of the box body 1 and are communicated with the rapid temperature changing air duct 10, the exhaust pipe 11 and the liquid nitrogen spraying cooling pipe 13.
In one implementation, electrical resistance heating wire 14 is provided within the rapid temperature change airway tube 10.
In one implementation, the number of the rapid temperature changing gas guide pipes 10 in each independent temperature interval 4 in the test chamber 7 of the box body 1 is 2, the number of the gas discharge pipes 11 is 1, and the number of the liquid nitrogen injection cooling pipes is 131.
In one implementation, temperature sensors 15 are provided at the upper portions of two independent temperature zones 4 within the test chamber 7 of the housing 1.
In one embodiment, the spacer 3 is a PTFE sheet and is fixed to the inner wall of the test chamber 7 by fixing metal plates 16.
In one implementation, the space between the pipelines is filled with heat insulation cotton.
The invention has the advantages and positive effects that:
1. the invention uses high and low temperature resistant material as a dual-temperature zone clapboard, and the high and low temperature resistant material and the sample are arranged in parallel in a test box in a detachable mode, and two independent test temperature zones are separated at the inner side and the outer side of the sample;
2. the invention adopts a mode that two temperature zones are respectively provided with a group of rapid temperature-changing air guide and exhaust pipelines for independent temperature-changing control of the temperature zones, each group of rapid temperature-changing air guide and exhaust pipelines is divided into 1 for rapid heating air inlet, cold air inlet and exhaust respectively and is used for rapid temperature rise and continuous low temperature tests, and liquid nitrogen injection is used for rapid temperature reduction. The method realizes extremely fast heating rate and cooling rate and maintains the test temperature for long-time stability during continuous test;
3. according to the invention, the resistance heating wire is arranged in the heating air inlet pipeline, and hot air flow is introduced into the test box by external air blowing, so that heat loss in the rapid heating process can be effectively reduced, and the heating rate can be adjusted by adjusting the flow of the introduced air flow;
4. according to the invention, the two air inlet pipelines are converged to the position of the stirring fan on the inner wall of the test box, and the fan can effectively ensure the temperature uniformity in the test box.
Drawings
FIGS. 1 and 3 are schematic diagrams of the internal and external structures of one side of the high and low temperature test chamber of the invention
FIGS. 2 and 4 are schematic diagrams of the internal and external structures of the other side of the high-low temperature test chamber
Detailed Description
The technical scheme of the invention is further detailed in the following by combining the drawings and the embodiment:
referring to the attached drawings 1-4, the high-low temperature test box for the double-temperature-zone thermal mechanical fatigue test capable of changing temperature rapidly is used for the thermal mechanical fatigue test of a glass transparent piece, a box body 1 of the high-low temperature test box is installed on a mechanical fatigue testing machine, a fatigue sample 2 penetrates through the upper end face and the lower end face of the box body 1 and is clamped between the upper clamp and the lower clamp of the mechanical fatigue testing machine, and detachable installation blocks 6 are arranged on the upper end face and the lower end face of one side of a box door 5 of the box body 1 and provide channels for the fatigue sample 2 to enter and exit. Be provided with baffle 3 in proof box 7 in box 1 and separate into two independent temperature regions 4 with the space in the proof box 7, make the transition face of fatigue sample 2 and its opposite face be located two independent temperature regions 4 respectively in, baffle 3 adopts the PTFE board to fix on the inner wall of proof box 7 through fixed panel beating 16.
The two independent temperature intervals 4 are sealed intervals, and the sealing mode is as follows: a sealing block 8 made of polytetrafluoroethylene materials is arranged at an opening of the fatigue test sample 2 penetrating through a test box 7 in the box body 1 and is fixed by a clamp 9. The polytetrafluoroethylene material can resist high and low temperatures of-190-250 ℃, allows quenching and shock heating, can be used as a sealing material, and has a low friction coefficient.
In this embodiment, stirring fans 12 are disposed in two independent temperature zones 4 in the test box 7 of the box body 1 and are communicated with the rapid temperature-changing air duct 10, the exhaust pipe 11 and the liquid nitrogen injection cooling pipe 13. An electric resistance heating wire 14 is arranged in the rapid temperature changing air duct 10. Temperature sensors 15 are provided at the upper parts of the two independent temperature zones 4 in the test chamber 7 of the housing 1.
The number of the rapid temperature changing air ducts 10 in each independent temperature interval 4 in the test box 7 of the box body 1 is 2, the number of the exhaust pipes 11 is 1, and the number of the liquid nitrogen injection cooling pipes is 131. And heat insulation cotton is filled among the pipelines.
The high-low temperature test chamber can form two independent test temperature areas on two sides of a sample for a fatigue test, and can realize independent temperature load control and quick heating or cooling in the two temperature areas. The high-low temperature test box comprises a box body 1, a box door 5, double-temperature-zone partition plates 3, a sealing block 8 with an upper opening and a lower opening of the box body, a rapid temperature-changing air duct 10, an exhaust pipe 11, a stirring fan 12, a resistance heating wire 14, a liquid nitrogen injection cooling pipe 13 and other components, wherein the two double-temperature-zone partition plates 3 and a fatigue sample 2 are arranged side by side, an inner temperature zone and an outer temperature zone are separated from the transition surface and two sides of the opposite surface of the fatigue sample 2 in a test box 7, the fatigue sample 2 penetrates through the box body 1 and the upper opening and the lower opening of the test box 7 to extend out to be fixed with a fatigue testing machine clamp, and the upper opening; the two groups of rapid temperature changing gas guide tubes 10, the exhaust tube 11 and the liquid nitrogen injection cooling tube 13 are respectively arranged in two independent temperature intervals 4 to form mutually independent gas inlet and exhaust circulation flows; the rapid temperature-changing gas-guide tube 10 and the exhaust tube 11 are respectively used for rapid temperature rise and continuous low temperature tests, and the liquid nitrogen injection cooling tube 13 injects liquid nitrogen for rapid temperature reduction; the resistance heating wire 14 is arranged in the rapid temperature changing air duct 10, hot air is introduced into the test box 7 by external air blowing, and the temperature in the test box 7 is uniform by a stirring fan 17 arranged on the inner wall of the test box 7.
Claims (9)
1. The utility model provides a but high low temperature test box for dual temperature district thermal mechanical fatigue test of rapid temperature change for the thermal mechanical fatigue test of glass transparency, its box (1) is installed on mechanical fatigue test machine, and fatigue test piece (2) pass the upper and lower terminal surface of box (1) and centre gripping between the upper and lower anchor clamps of mechanical fatigue test machine, its characterized in that: a clapboard (3) is arranged in a test box (7) in a box body (1) to divide the space in the test box (7) into two independent temperature intervals (4), so that a transition surface and an opposite surface of a fatigue sample (2) are respectively positioned in the two independent temperature intervals (4); the two independent temperature intervals (4) are sealed intervals.
2. The high-low temperature test chamber for the rapid temperature change dual-temperature-zone thermomechanical fatigue test of claim 1, characterized in that: the upper end face and the lower end face of one side of the box door (5) of the box body (1) are provided with detachable installation blocks (6) which provide channels for the fatigue test sample (2) to enter and exit the box body (1).
3. The high-low temperature test chamber for the rapid temperature change dual-temperature-zone thermomechanical fatigue test of claim 1, characterized in that: a sealing block (8) made of polytetrafluoroethylene materials is arranged at an opening of the fatigue test sample (2) penetrating through a test box (7) in the box body (1) and is fixed by a hoop (9).
4. The high-low temperature test chamber for the rapid temperature change dual-temperature-zone thermomechanical fatigue test of claim 1, characterized in that: stirring fans (12) are arranged in two independent temperature intervals (4) in a test box (7) of the box body (1) and are communicated with the rapid temperature changing air duct (10), the exhaust pipe (11) and the liquid nitrogen spraying cooling pipe (13).
5. The high-low temperature test chamber for the rapid temperature change dual-temperature-zone thermomechanical fatigue test of claim 4, characterized in that: a resistance heating wire (14) is arranged in the rapid temperature changing air duct (10).
6. The high-low temperature test chamber for the rapid temperature change dual-temperature-zone thermomechanical fatigue test of claim 4, characterized in that: the number of the rapid temperature changing air ducts (10) in each independent temperature interval (4) in the test box (7) of the box body (1) is 2, the number of the exhaust pipes (11) is 1, and the number of the liquid nitrogen injection cooling pipes is (13) 1.
7. The high-low temperature test chamber for the rapid temperature change dual-temperature-zone thermomechanical fatigue test of claim 1, characterized in that: temperature sensors (15) are arranged at the upper parts of two independent temperature intervals (4) in a test box (7) of the box body (1).
8. The high-low temperature test chamber for the rapid temperature change dual-temperature-zone thermomechanical fatigue test of claim 1, characterized in that: the partition plate (3) is made of PTFE plates and is fixed on the inner wall of the test box (7) through a fixing metal plate (16).
9. The high-low temperature test chamber for the rapid temperature change dual-temperature-zone thermomechanical fatigue test of claim 4, characterized in that: and heat insulation cotton is filled among the pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010304952.8A CN111420717A (en) | 2020-04-17 | 2020-04-17 | High-low temperature test box capable of changing temperature rapidly and used for dual-temperature-zone thermal mechanical fatigue test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010304952.8A CN111420717A (en) | 2020-04-17 | 2020-04-17 | High-low temperature test box capable of changing temperature rapidly and used for dual-temperature-zone thermal mechanical fatigue test |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405268A (en) * | 2021-06-16 | 2021-09-17 | 中科美其（天津）科技有限公司 | Refrigerating system based on environmental simulation test box |
| CN114100698A (en) * | 2021-08-31 | 2022-03-01 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Combined high-low temperature alternating damp-heat test box |
| CN114860000A (en) * | 2022-07-06 | 2022-08-05 | 中国飞机强度研究所 | Temperature rise and drop control device and method for airplane pneumatic thermal environment simulation test |
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Patent Citations (6)
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| CN102879278A (en) * | 2012-09-14 | 2013-01-16 | 清华大学 | High-low temperature dynamic cold-hot circulation thermodynamic test system |
| CN103076221A (en) * | 2013-01-12 | 2013-05-01 | 南昌航空大学 | Device for testing mechanical property of material at low temperature |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405268A (en) * | 2021-06-16 | 2021-09-17 | 中科美其（天津）科技有限公司 | Refrigerating system based on environmental simulation test box |
| CN114100698A (en) * | 2021-08-31 | 2022-03-01 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Combined high-low temperature alternating damp-heat test box |
| CN114860000A (en) * | 2022-07-06 | 2022-08-05 | 中国飞机强度研究所 | Temperature rise and drop control device and method for airplane pneumatic thermal environment simulation test |
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Application publication date: 20200717 |