JPH04259832A - Temperature measuring apparatus for heat exchanger - Google Patents

Abstract

PURPOSE:To easily measure the temperature in a stable manner without accompanying measuring errors due to the change of the wind velocity or being influenced by the change of the ambient temperature, with good reproducibility of data. CONSTITUTION:A temperature sensor 5 is placed a predetermined distance from a heat exchanger 3 at the discharging side of a wind tunnel 1 having an opening part to install the heat exchanger 3. The temperature is measured by the temperature sensor 5 in the flow of the air generated within the wind tunnel 1 via a fan 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring device for a heat exchanger used for checking the performance and quality of radiators, heaters, automobiles, air conditioners for home appliances, etc. installed in automobiles.

0002

2. Description of the Related Art A temperature measuring device having a configuration as shown in FIG. 5 is normally used for this type of temperature measurement. Here, air is blown from the front of the object whose temperature is to be detected, for example, an automobile radiator 41, and a part of the air is heat-exchanged to the air collection chamber 43 via the air sampler 42 arranged on the back side. The temperature of the intake air is measured by a temperature sensor 44 installed therein.

In this case, the air sampler 42 is
It is equipped with a plurality of air introduction pipes 42a having a large number of openings (not shown) toward the radiator 41, so that air passing through the radiator 41 can be evenly taken in throughout. In addition, negative pressure for air intake is provided by a blower 45 connected to the air collection chamber 43. In addition, as shown in FIG. 6, a support body 52 is disposed in an open state and laterally on the air outlet side of a radiator 51, etc., and thermoelectric bodies 53 are attached to the support body 52, and electrical signals from these thermocouples 53 are transmitted. There is one in which the average temperature is measured by inputting the temperature into a recorder or the like via a signal line 54.

0004

[Problems to be Solved by the Invention] However, when using the air sampler 42 shown in FIG. 5 to measure a part of the air passing through a detection object such as a radiator 41, it is necessary to In addition to the insufficient amount of data, there is also a temperature measurement error due to heat leakage in the sampler 42. In the case of the device shown in FIG. There are variations in the measured value of a certain thermocouple 53 and the influence of external disturbances, and in both cases, there are large measurement errors due to changes in wind speed relative to the object to be detected and ambient temperature, resulting in poor data reproducibility. , it is difficult to make stable measurements.

[0005]

[Object of the Invention] The present invention has been made based on the above circumstances, and provides stable data with good reproducibility without measurement errors caused by changes in wind speed, etc., and without being affected by temperature changes in the surrounding environment. An object of the present invention is to provide a temperature measuring device for a heat exchanger that can easily measure the temperature of the heat exchanger.

[0006]

[Means for solving the problem] Therefore, in the present invention,
As shown in the illustrated embodiment, a temperature sensor is installed in a wind tunnel 1 having an opening 4 into which a heat exchanger 3 is mounted, located on the exhaust side of the wind tunnel and separated from the heat exchanger 3 by a predetermined distance. The temperature is measured by the temperature sensor in the flow of air generated in the wind tunnel 1 via the blower 11.

In this case, the temperature sensor is located in the wind tunnel 1.
The wind tunnel 1 is configured with an average temperature measuring sensor 5 having a plurality of detecting parts capable of detecting an average temperature with respect to a passage cross section, and the wind tunnel 1 has a shape narrowed so that the passage cross section is small with respect to the installation part of the unit. You can also do it.

Furthermore, a second wind tunnel 8 is provided which is connected to the opening 4 of the wind tunnel 1, and differential pressure gauge pickups 9 and 10 are installed in both the wind tunnels 1 and 8 to determine the pressure from the measured values. A loss value may also be obtained.

[0009] Inside the wind tunnel 1, heat insulating materials 1b and 1c may be provided to prevent heat transfer to and from the outside.

Furthermore, the temperature sensor can also be constituted by a temperature distribution measuring sensor 15 that measures the temperature distribution of the heat exchanger 3 in the wind tunnel 1.

[0011]

[Operation] Due to this configuration, the entire amount of air passing through the heat exchanger 3 is measured, and since it is measured by the temperature sensor during the process of passing through the wind tunnel 1, the influence of changes in wind speed is eliminated. It is possible to perform stable temperature measurements with good data reproducibility without being affected by the ambient temperature.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic side view showing an embodiment of the present invention, and FIG. 2 is an enlarged side view of essential parts of the above embodiment. In these figures, reference numeral 1 denotes a wind tunnel mounted on a trolley 2. The wind tunnel 1 is arranged horizontally and has an opening 4 at one end into which a heat exchanger 3 as an object to be detected is mounted. Furthermore, casters 2a are provided at the bottom of the trolley 2 to allow it to move freely. The wind tunnel 1 has a cylindrical shape such as a rectangular tube, and is narrowed so that its passage cross-sectional area is small relative to the part where the unit is attached. A temperature sensor is provided on the exhaust side to measure the temperature of the heat exchanger 3. As this temperature sensor,
An average temperature measurement sensor 5 is provided at a predetermined distance from the heat exchanger 3 and detects the average temperature of the passage cross section in the wind tunnel 1, and an average temperature measurement sensor 5 is provided near the opening 4 to measure the temperature distribution of the heat exchanger 3. There is a temperature distribution measurement sensor 15 that measures the temperature distribution.

The unit of the average temperature measuring sensor 5 is, for example, as shown in FIG.
Tangle b in the required pattern and measure the temperature. The electrical signal is then taken into the recorder 10 via the temperature converter 5x. Furthermore, the temperature distribution measurement sensor 15 is shown in FIG. 4, and a plurality of thermoelectric bodies 15b are attached to each intersection of the grid-like support 15a, and an electric signal from each thermocouple 15b is transmitted to a recorder or the like. The temperature at each location is measured.

[0014] Furthermore, the wind tunnel 1 has a main body portion 1a surrounded by a heat insulating material 1b such as urethane foam,
The temperature of the air passing through the interior is not affected by the external environmental temperature. A heat insulating material 1c made of urethane or the like is provided inside near the opening 4. The heat exchanger 3 as the object to be detected differs in size depending on the model, so
The opening 4 is configured in advance to have a maximum diameter, and in the case of a small-sized heat exchanger, it is desirable to change the size of the urethane foam 1c to maintain airtightness. Further, a cylindrical hood 6 is connected to the wind tunnel 1 located at the rear of the unit, and a net 7 for protecting the average temperature measurement sensor 5 is attached to the rear end of the hood 6. There is.

Furthermore, a second wind tunnel 8 is connected to the opening 4 of the wind tunnel 1. L-shaped angles 8b are provided on the upper, lower, left and right sides of the opening 4 side of the wind tunnel 8, respectively, to correspond to the size of the heat exchanger 3 and are movable in the vertical and horizontal directions for closing gaps. And both wind tunnels 1 and 8 mentioned above
Inside are equipped with differential pressure gauge pickups 9a and 9b, respectively. Each pressure difference is converted into an electric signal by a differential pressure gauge 9c and sent to a recorder 10, and the pressure loss value of the heat exchanger is obtained from the measured value. The pickups 9a are arranged one each on the upper wall, right and left walls of the wind tunnel 1, and the pickups 10 are arranged one each on the upper and lower walls and the left and right walls of the wind tunnel 8. The wind tunnel 8 has an opening 8a at its rear end that is joined to the opening 4, and is connected to a blower 11 at its front end. Wind tunnel 1 via exchanger 3
It is designed to supply air to the In this embodiment, a nozzle switch 12 is provided to adjust the temperature, pressure, wind force, etc. of the air to the wind tunnel 8, assuming the air condition when a car is running.

In such a configuration, the air introduced into the wind tunnels 1 and 8 by the action of the blower 11 is not affected by the external environmental temperature, and the entire amount passes through the heat exchanger 3, and the average amount on the exhaust port side is The temperature measurement sensor 5 can obtain uniform measurement results over the entire area and measure a stable average temperature with few errors. Moreover, since the pressure loss can be accurately obtained from the measurement result by the differential pressure gauge 9c, more accurate measurement can be performed. Furthermore, although the cross-sectional area through which air flows into the wind tunnel 1 is small, the cross-sectional area at the temperature measurement section is smaller than that of the opening 4, as clarified in the above embodiment. 1 is also narrowed toward the exhaust side, so temperature can be measured regardless of the size of the heat exchanger.

[0017]

Effects of the Invention As described in detail above, the present invention provides a wind tunnel having an opening in which a heat exchanger is installed, which is located on the exhaust side of the wind tunnel, and is located at a predetermined distance from the heat exchanger to maintain the temperature. Since the sensor is installed and the temperature is measured by the temperature sensor in the flow of air generated in the wind tunnel via the blower, there is no measurement error due to changes in wind speed, etc.
without being affected by external disturbances such as temperature changes in the surrounding environment.
The effect is that stable and highly accurate measurements can be easily performed with good data reproducibility.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the present invention.

FIG. 2 is an enlarged side view of main parts of the above embodiment.

FIG. 3 is a front view showing an average temperature measurement sensor as a temperature sensor.

FIG. 4 is a front view showing a temperature distribution measuring sensor as a temperature sensor.

FIG. 5 is a schematic perspective view of a conventional example.

FIG. 6 is a schematic perspective view of another conventional example.

[Explanation of symbols]

1... Wind tunnel, 1b, 1c... Insulating material, 2... Trolley, 3... Heat exchanger, 4... Opening, 5... Sensor for average temperature measurement, 6... Hood, 8... Wind tunnel, 9, 10... Differential pressure gauge pickup , 11
...Blower, 15...Temperature distribution measurement sensor.

Claims (5)

[Claims] [Claim 1] An opening (4) for mounting a heat exchanger (3).
), a temperature sensor is disposed on the exhaust side of the wind tunnel (1) at a predetermined distance from the heat exchanger (3). 1.) A temperature measuring device for a heat exchanger, characterized in that the temperature sensor measures the temperature in the air flow generated within the chamber. 2. The temperature sensor is composed of an average temperature measuring sensor 5 (5) that detects the average temperature with respect to a passage cross section in the wind tunnel (1), and the wind tunnel (1) is located at the mounting part of the unit. 2. The temperature measuring device for a heat exchanger according to claim 1, wherein the temperature measuring device is narrowed so that the passage cross-sectional area becomes smaller. 3. A second wind tunnel (8) connected to the opening (4) of the wind tunnel (1), wherein both the wind tunnels (1),
3. The temperature measuring device for a heat exchanger according to claim 1, wherein the temperature measuring device for a heat exchanger is equipped with differential pressure gauge pickups (9) and (10) in the inside (8), and a pressure loss value is obtained from the measured value. 4. The temperature for heat exchange according to claim 1, 2 or 3, wherein the inside of the wind tunnel (1) is provided with heat insulating materials (1b) and (1c) for preventing heat transfer with the outside. Measuring device. 5. The heat exchanger according to claim 1, 2, 3, or 4, wherein the temperature sensor is a temperature distribution measurement sensor (15) that measures the temperature distribution of the heat exchanger (3) in the wind tunnel (1). Temperature measurement device for exchangers.