A device and method for connecting temperature test wires for arc wind tunnel testing

Abstract

The present invention provides a device and method for connecting temperature test lines for arc wind tunnel testing, comprising a lidless, box-shaped housing formed by splicing semiconductor thermoelectric elements, the outer wall of the housing being provided with external fins, the housing containing a medium, a baffle blocking the upper portion of the medium, internal fins mounted on the baffle surface adjacent to the medium, a quick-connect terminal disposed on the top surface of the baffle, a temperature sensor disposed on the internal fin, the temperature sensor electrically connected to a temperature acquisition system, the temperature acquisition system being connected to a controller, the controller being connected to a voltage-stabilized power supply, and the voltage-stabilized power supply being electrically connected to the housing. The present invention not only solves the cumbersome steps of connecting thermocouples and temperature test lines, but also avoids the need to add an ice bucket to maintain a constant zero point when the temperature measurement lines are complex, thereby ensuring that the starting point of the temperature data is a constant zero degree.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature measurement signal connection equipment, and in particular to a device and method for connecting temperature test wires for arc wind tunnel testing. Background Art

[0002] Arc wind tunnels are effective and essential core experimental equipment for the design of thermal-resistant structural materials for hypersonic vehicles. Arc wind tunnels can simulate the aerodynamic heating environment of various hypersonic vehicles within a certain range, allowing for aerodynamic and thermal ground simulation tests on various aircraft models.

[0003] During arc wind tunnel testing, to assess the thermal performance of experimental materials, temperature sensors must be placed on the model to obtain valid test data. The most common temperature sensors are small-diameter thermocouples, and in many cases, there can be as many as fifty or sixty of them. These numerous thermocouples must be connected one-to-one to fifty or sixty temperature measurement signal lines. At the same time, the starting point of the temperature data must be at absolute zero. This means the junction between the thermocouple and the signal line must be in a relatively stable zero-degree environment. This requires the use of an ice bucket to maintain this zero point, which is difficult to achieve with a large number of thermocouples. Summary of the Invention

[0004] The purpose of the present invention is to provide a connection device between temperature test wires for arc wind tunnel tests, which solves the cumbersome problem of connecting temperature measuring thermocouples and test wires in actual tests and ensures that the junction temperature between the thermocouple and the signal wire is relatively stable in a zero-degree environment.

[0005] The present invention provides a connection device between temperature test lines for arc wind tunnel testing, comprising a lidless box-shaped shell formed by splicing semiconductor thermoelectric sheets, an outer wall of the shell being provided with external fins, a medium being contained in the shell, a baffle being sealed above the medium, an internal fin being installed on a surface of the baffle close to the medium, a quick-connect terminal being provided on the top surface of the baffle, a temperature sensor being provided on the internal fin, the temperature sensor being electrically connected to a temperature acquisition system, the temperature acquisition system being connected to a controller, the controller being connected to a voltage-stabilized power supply, and the voltage-stabilized power supply being electrically connected to the shell.

[0006] Furthermore, the quick-connect terminal is slidably mounted on the top surface of the baffle, and a serial number is marked on the quick-connect terminal.

[0007] Furthermore, a guide rail is installed on the top surface of the baffle, and the bottom surface of the quick connection terminal is connected to the sliding block of the guide rail.

[0008] Furthermore, the top surface of the baffle is provided with limit blocks installed at both ends of the quick connection terminal.

[0009] Furthermore, a first wire inlet and a second wire inlet are respectively formed on two opposite side surfaces of the housing.

[0010] Furthermore, the heights of the first wire inlet and the second wire inlet are not lower than the height of the baffle.

[0011] Furthermore, the inner fins and the outer fins are both made of metallic copper material.

[0012] Furthermore, the baffle is made of polytetrafluoroethylene material.

[0013] Furthermore, the medium is ice salt, ethylene glycol or water.

[0014] The present invention also provides a method for using a connection device between temperature test wires for arc wind tunnel testing, comprising: passing a thermocouple through a first wire inlet and connecting the wires according to the serial number on the quick-connect terminal, passing a temperature measurement signal wire through a second wire inlet and connecting the wires to the thermocouples one-to-one according to the serial number of the quick-connect terminal, then monitoring the temperature of the internal fins through a temperature acquisition system, controlling the voltage value of a voltage-stabilized power supply through a controller to adjust the temperature of the inner and outer surfaces of the semiconductor thermoelectric chip shell (i.e., the cold end and hot end of the semiconductor thermoelectric chip), and the shell and the internal medium cooperate to adjust the internal temperature so that the interior maintains a constant zero point.

[0015] The present invention avoids the need to add an ice bucket to maintain a constant zero point when the circuit is complicated, and ensures that the starting point of the temperature data is a constant zero degree. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0017] Figure 1 It is a structural diagram of the device of the present invention;

[0018] Figure 2 Schematic diagram of the internal structure of the present invention;

[0019] Figure 3 A schematic diagram of the connection circuit of the present invention;

[0020] Description of reference numerals:

[0021] In the figure: 1-connection device, 101-external fins, 102-housing, 103-first wire inlet, 104-quick connection terminal, 105-baffle, 106-guide rail, 107-second wire inlet, 108-internal fins, 2-temperature acquisition system, 3-controller, 4-regulated power supply; DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0025] Example 1

[0026] like Figure 1-Figure 3 As shown:

[0027] A connection device for temperature test lines for arc wind tunnel testing includes a lidless box-shaped housing 102. The housing 102 is composed of a ceramic semiconductor thermoelectric chip. The outer wall of the housing 102 is provided with external fins 101. The external fins are made of a metallic copper material. The external fins 101 are attached to the outer surface of the housing 102 and are preferably bonded with high thermal conductivity silicone grease. The housing 102 contains a medium. The medium in this embodiment is ice salt. In addition, ethylene glycol or water can also be selected as the medium.

[0028] The shell 102 composed of semiconductor thermoelectric sheets has the thermoelectric effect of semiconductors. The outer surface of the shell 102 is a hot end with a higher temperature, and the inner surface of the shell is a cold end with a lower temperature. After power is turned on, the outer surface temperature rises and the inner surface temperature drops, resulting in a temperature difference.

[0029] A baffle 105 is sealed above the ice salt. Internal fins 108 are installed on the surface of the baffle 105 close to the medium. The height of the internal fins 108 is about 5mm higher than the water level on the top of the ice salt. The internal fins are made of metal copper material, and the baffle 105 is made of polytetrafluoroethylene material.

[0030] A quick-connect terminal 104 is provided on the upper surface of the baffle 105, and the quick-connect terminal 104 is slidably installed on the top surface of the baffle 105. The quick-connect terminal 104 is marked with a serial number. A guide rail 106 is installed on the top surface of the baffle 105. The bottom surface of the quick-connect terminal 104 is connected to the sliding block of the guide rail 106. The top surface of the baffle 105 is provided with limit blocks installed at both ends of the quick-connect terminal 104.

[0031] A first wire inlet 103 and a second wire inlet 107 are respectively formed on two opposite sides of the housing 102 . The heights of the first wire inlet 103 and the second wire inlet 107 are not less than the height of the baffle 105 .

[0032] A PT100 temperature sensor is provided on the internal fin 108, the temperature sensor is electrically connected to the temperature acquisition system 2, the temperature acquisition system 2 is connected to the controller 3, the controller 3 is connected to the stabilized power supply 4, the stabilized power supply 4 adopts a four-way controllable power supply, and the stabilized power supply 4 is electrically connected to the inner and outer surfaces of the shell 102 respectively.

[0033] The connecting device 1, the temperature acquisition system 2, the controller 3 and the voltage-stabilized power supply 4 form a closed-loop control system.

[0034] The top opening of the housing 102 is provided with a heat-insulating upper cover for sealing and heat insulation.

[0035] The present invention also provides a method for using a connection device between temperature test wires for arc wind tunnel testing, comprising: passing a thermocouple through a first wire inlet 103 and connecting the wires according to the serial numbers on a quick-connect terminal 104; passing a temperature measurement signal wire through a second wire inlet 107 and connecting the wires to the thermocouples in a one-to-one correspondence according to the serial numbers on the quick-connect terminal 104; then, monitoring the temperature of an internal fin 108 through a temperature acquisition system 2; and controlling the voltage value of a stabilized power supply 4 through a controller 3 to adjust the temperature difference ΔT between the inner and outer surfaces of a housing 102;

[0036] The voltage U is related to it as U=ɑ*ΔT=ɑ*(T1-T2);

[0037] This device is used for arc wind tunnel testing, so the temperature of the outer surface of the semiconductor thermoelectric element shell 102 in this device is relatively high. According to the above relationship, ɑ is a fixed coefficient, so the voltage value U provided by the voltage-stabilized power supply 4 is proportional to the temperature difference ΔT between the inner and outer surfaces of the shell 102. The greater the voltage U provided by the voltage-stabilized power supply 4, the greater the temperature difference ΔT between the inner and outer surfaces of the shell 102, the temperature of the outer surface of the shell 102 increases, and the temperature of the inner surface of the shell 102 decreases.

[0038] Before the arc wind tunnel test begins, the voltage regulator 4 provides a constant voltage, and the temperature difference between the inner and outer surfaces of the housing 102 is also constant. The temperatures of the outer and inner surfaces of the housing 102 are constant.

[0039] When the temperature sensor detects that the surface temperature of the internal fin 108 is higher than the constant zero point, the temperature acquisition system 3 feeds back the corresponding signal to the controller 2. The controller 2 increases the voltage supplied by the regulating power supply 4, thereby increasing the temperature difference between the inner and outer surfaces of the shell 102. Because the outer surface is provided with external fins for heat dissipation, the temperature of the outer surface can be kept constant regardless of how the supplied voltage changes. However, the temperature difference is still changing, so the temperature of the inner surface will be reduced, so that the temperature of the internal fin 108 reaches a constant zero point, ensuring that the junction temperature of the thermocouple and the signal line is relatively stable in a zero-degree environment.

[0040] The relationship between the temperature difference ΔT and the temperature of the inner surface T2 and the outer surface T1 is ΔT = (T1-T2);

[0041] The temperature difference ΔT is constant. If the outer surface T1 decreases, then the inner surface T2 will also decrease. In this way, after the external fins 101 help the outer surface to dissipate heat, the temperature of the inner surface will decrease. At the same time, a temperature sensor is provided to monitor the internal temperature, so that the internal temperature is automatically adjusted to maintain a constant zero point.

[0042] The present invention simplifies cumbersome steps, avoids the need to add an ice bucket to maintain a constant zero point in the prior art, ensures that the starting point of the automatic control adjustment temperature data is a constant zero degree, and by providing quick-connect terminals marked with serial numbers, avoids misconnection or missed connection between the temperature measuring thermocouple and the signal line due to complex wiring during work, thereby ensuring accurate temperature test data.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A connection device for temperature test wires for arc wind tunnel testing, characterized by: The invention comprises a coverless box-shaped shell formed by splicing semiconductor thermoelectric sheets, the outer wall of the shell is provided with external fins, the shell contains a medium, the medium is ice salt or ethylene glycol, a baffle is sealed above the medium, the surface of the baffle close to the medium is provided with internal fins, the top surface of the baffle is provided with a quick connection terminal, a temperature sensor is provided on the internal fin, the temperature sensor is electrically connected to a temperature acquisition system, the temperature acquisition system is connected to a controller, the controller is connected to a stabilized power supply, and the stabilized power supply is electrically connected to the shell.

2. The connection device for temperature test wires for arc wind tunnel testing according to claim 1, characterized in that: The quick connection terminal is slidably mounted on the top surface of the baffle, and a serial number is marked on the quick connection terminal.

3. The connection device between temperature test wires for arc wind tunnel testing according to claim 2, characterized in that: A guide rail is installed on the top surface of the baffle, and the bottom surface of the quick connection terminal is connected to the sliding block of the guide rail.

4. The connection device for temperature measurement lines for arc wind tunnel testing according to claim 2, characterized in that: The top surface of the baffle is provided with limit blocks installed at both ends of the quick connection terminal.

5. The connection device for temperature test wires for arc wind tunnel testing according to claim 1, characterized in that: Two opposite side surfaces of the shell are respectively provided with a first wire inlet and a second wire inlet.

6. The connection device for temperature measurement lines for arc wind tunnel testing according to claim 5, characterized in that: The heights of the first wire inlet and the second wire inlet are not lower than the height of the baffle.

7. The connection device between temperature test wires for arc wind tunnel testing according to claim 1, characterized in that: The inner fins and the outer fins are both made of metallic copper material.

8. The connection device between temperature test wires for arc wind tunnel testing according to claim 1, characterized in that: The baffle is made of polytetrafluoroethylene material.

9. A method for using the temperature measuring wire connection device for arc wind tunnel testing according to claim 1, characterized in that: include: Pass the thermocouple through the first inlet and connect it according to the serial number on the quick-connect terminal. Pass the temperature measurement signal line through the second inlet and connect it to the thermocouple one by one according to the serial number of the quick-connect terminal. Then monitor the temperature of the internal fins through the temperature acquisition system, and control the voltage value of the voltage-stabilized power supply through the controller to adjust the temperature of the inner and outer surfaces of the semiconductor thermoelectric element shell, which serves as the cold end and hot end respectively. The shell and the internal medium cooperate to adjust the internal temperature so that the interior maintains a constant zero point.

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