JP2015055556A - Hygrometer constituent member, hygrometer, and environment testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hygrometer constituent member capable of preventing the corrosion of a heat transfer member and the falling of a temperature detection part in a measurement space, and accurately measuring temperature to be used for a humidity arithmetic operation.SOLUTION: A hygrometer constituent member includes: a heat pipe 11 having a first portion 11a disposed in a measurement space 101 and a second portion 11b disposed in an external space heat-insulated from the measurement space 101; a temperature sensor 12, mounted on the surface of the first portion 11a of the heat pipe 11, for detecting the temperature of the surface of the first portion 11a; a protection pipe 14 for covering the first portion 11a of the heat pipe 11 and the temperature sensor 12; and a heat radiation part 13, connected to the second portion 11b of the heat pipe 11, for receiving heat from the second portion 11b and radiating heat to the external space. The first portion 11a of the heat pipe 11 is thermally connected via a filler 15 to the protection pipe 14.

Description

  The present invention relates to a hygrometer component, a hygrometer, and an environmental test apparatus.

  Conventionally, in order to measure the relative humidity of the measurement space inside the chamber of the environmental test apparatus, a hygrometer using a heat transfer member such as a heat pipe is used as described in Patent Document 1.

  This hygrometer includes a heat transfer member such as a heat pipe and a temperature sensor attached to the surface of the heat pipe. One end of the heat pipe penetrates through the heat insulating layer of the chamber and is inserted into the measurement space inside the chamber. The other end of the heat pipe is exposed to an external space outside the chamber. The temperature sensor is bonded to the surface of one end portion of the heat pipe protruding into the chamber, or is fixed using a tape or a band.

  A heat pipe is a sealed thin tube with good thermal conductivity, in which a working fluid such as water is sealed under reduced pressure as a heat transfer medium, and between the ends projecting inside and outside the measurement space. Heat transfer in In such a heat pipe, since the end exposed to the outside of the measurement space is always cooled by the outside air, the end inside the measurement space can be maintained below the dew point. And the surface temperature of the edge part of the heat pipe which protrudes inside the measurement space is measured by a temperature sensor. It is possible to obtain the relative humidity inside the measurement space by inputting the dry bulb temperature obtained by the dry bulb temperature measuring unit and the surface temperature of the end of the heat pipe into the arithmetic circuit and calculating with a predetermined arithmetic expression. .

JP 2012-83206 A

  In the above configuration, the heat transfer member made of a heat pipe or the like is easily corroded because it is used for the environmental test in a state exposed to the measurement space. In addition, heat pipes are usually made of copper with good thermal conductivity, and are particularly susceptible to corrosion.

  In addition, since the temperature sensor for measuring the surface temperature of the heat pipe is fixed to the surface of one end of the heat pipe protruding into the chamber by bonding or the like, the temperature sensor is separated from the surface of the heat pipe by moisture or the like inside the measurement space. There is a risk of falling off, and there is a problem in fixing strength and durability.

  In order to solve the above problem, it is conceivable to attach a cover for protecting the heat pipe and the temperature sensor. In such a case, the heat resistance of the air layer formed in the gap between the cover and the heat pipe may be considered. The difference between the measured temperature obtained by the temperature sensor and the measured temperature measured by the temperature sensor when not covered (hereinafter referred to as “the actual temperature of the measurement space”) becomes large, and the measurement space in the temperature sensor Since the followability to the internal temperature change is reduced, it is difficult to accurately measure the temperature used for the humidity calculation.

  The present invention has been made in view of the circumstances as described above, and can prevent corrosion of the heat transfer member and drop-off of the temperature detection unit inside the measurement space, and can accurately set the temperature used for the humidity calculation. An object of the present invention is to provide a hygrometer component that can be measured, and a hygrometer and an environmental test apparatus including the hygrometer component.

  In order to solve the above problems, the hygrometer component of the present invention is a hygrometer component for measuring humidity in a measurement space, and can enclose a working fluid and cause a heat pipe phenomenon. A first portion arranged in the measurement space and a second portion arranged in an external space insulated from the measurement space, and between the first portion and the second portion A heat transfer member to which heat is transferred, a temperature detector attached to the surface of the first part of the heat transfer member, and detecting the temperature of the first part; the first part of the heat transfer member; A protection tube that covers the temperature detection unit; and a heat dissipation unit that is connected to the second part of the heat transfer member and receives heat from the second part and dissipates heat to the external space. One part is thermally connected to the protective tube It is characterized in.

  According to such a configuration, the temperature detector is attached to the surface of the first part arranged in the measurement space of the heat transfer member, and the first part and the temperature detector are covered with the protective tube. It is possible to prevent corrosion of the heat transfer member and dropping off of the temperature detection unit.

  In addition, since the first portion of the heat transfer member is thermally connected to the protection tube, heat can be conducted from the protection tube to the heat transfer member without interposing an air layer. Therefore, the deviation between the measurement temperature obtained by the temperature detection unit attached to the heat transfer member and the actual temperature inside the measurement space is reduced. Therefore, the followability to the temperature change in the measurement space in the temperature detection unit is improved, and the temperature used for the humidity calculation can be accurately measured.

  A heat conductive filler is filled between the heat transfer member and the protective tube, and the first portion of the heat transfer member is thermally connected to the protective tube via the filler. It may be a configuration.

  According to such a configuration, heat is conducted from the protective tube to the heat transfer member via the heat conductive filler, so that the followability to the temperature change in the measurement space in the temperature detection unit is improved, and the humidity calculation is performed. It is possible to accurately measure the temperature used. In addition, since the filler is filled between the heat transfer member and the protective tube, the work of bringing the first portion of the heat transfer member into close contact with the protective tube is not required, and the assembly workability is improved.

  Further, at least a part of the peripheral surface of the first portion of the heat transfer member may be in close contact with the inner surface of the protective tube.

  According to this configuration, the peripheral surface of the first portion of the heat transfer member is in close contact with the inner surface of the protective tube, so that heat can be directly conducted from the protective tube to the heat transfer member. Therefore, the followability to the temperature change in the measurement space in the temperature detection unit is improved, and the temperature used for the humidity calculation can be accurately measured.

  Moreover, it is preferable that the said temperature detection part is pinched | interposed and hold | maintained between the surface of the 1st part of the said heat-transfer member, and the said protective tube.

  According to such a configuration, the temperature detection unit is sandwiched and held between the surface of the first portion of the heat transfer member and the protective tube, so that the temperature detection unit may fall off the surface of the heat transfer member. It is possible to reduce and stabilize the holding state of the temperature detection unit.

  The heat transfer member is preferably a heat pipe.

  Since heat pipes are usually made of copper with good thermal conductivity, they are particularly susceptible to corrosion when used in environmental tests when exposed to the measurement space. However, in the above configuration, the heat pipe is a heat transfer member. Since the first portion is covered with a protective tube, corrosion of the heat pipe in the measurement space can be prevented.

  The protective tube is preferably made of a metal having corrosion resistance.

  According to such a configuration, the protective tube is not easily corroded even if it is exposed inside the measurement space.

  A hygrometer of the present invention is a hygrometer for measuring humidity in a measurement space, the hygrometer constituting member, a dry bulb temperature measuring unit for measuring a dry bulb temperature in the measurement space, and the hygrometer A calculation unit that calculates the humidity of the measurement space based on the temperature of the first part measured by the constituent member and the dry bulb temperature of the measurement space measured by the dry bulb temperature measurement unit; It is characterized by being.

  According to this configuration, the first portion of the heat transfer member of the hygrometer component is thermally connected to the protective tube, so that heat is transferred from the protective tube to the heat transfer member without interposing an air layer. Is possible. Therefore, the deviation between the measurement temperature obtained by the temperature detection unit attached to the heat transfer member and the actual temperature inside the measurement space is reduced. Therefore, the followability to the temperature change in the measurement space in the temperature detection unit is improved, and the temperature used for the humidity calculation can be accurately measured. As a result, an accurate measurement of humidity is performed by the calculation unit performing calculations based on the temperature of the first part measured by the hygrometer component and the dry bulb temperature detected by the dry bulb temperature measurement unit in this way. Is possible.

  An environmental test apparatus according to the present invention includes a chamber having the measurement space insulated from an external space, a control unit that controls the temperature and humidity of the measurement space, and a hygrometer for measuring humidity in the measurement space. The hygrometer includes the hygrometer component, a dry bulb temperature measurement unit that measures the dry bulb temperature of the measurement space, the temperature of the first portion measured by the hygrometer component, and the And a calculation unit that calculates the humidity of the measurement space based on the dry bulb temperature of the measurement space measured by the dry bulb temperature measurement unit.

  According to this configuration, the first portion of the heat transfer member of the hygrometer component is thermally connected to the protective tube, so that heat is transferred from the protective tube to the heat transfer member without interposing an air layer. Is possible. Therefore, the deviation between the measurement temperature obtained by the temperature detection unit attached to the heat transfer member and the actual temperature inside the measurement space is reduced. Therefore, the followability to the temperature change in the measurement space in the temperature detection unit is improved, and the temperature used for the humidity calculation can be accurately measured. As a result, in the hygrometer, the calculation unit calculates based on the measured temperature of the first part and the dry bulb temperature detected by the dry bulb temperature measurement unit, thereby enabling accurate humidity measurement. Become. Thereby, the environmental test apparatus can perform an environmental test under a finer humidity condition inside the measurement space based on the accurately measured humidity.

  As described above, according to the hygrometer component of the present invention, it is possible to prevent the heat transfer member from corroding inside the measurement space and the temperature detecting unit from falling off. In addition, the temperature used for the humidity calculation can be accurately measured.

  Further, according to the hygrometer of the present invention, the calculation unit performs the calculation based on the temperature of the first portion measured by the hygrometer component and the dry bulb temperature measured by the dry bulb temperature measurement unit, Accurate humidity measurement is possible.

  Furthermore, according to the environmental test apparatus of the present invention, it is possible to perform an environmental test under a finer humidity condition inside the measurement space based on the humidity accurately measured by the hygrometer.

It is a block diagram which shows the structure of the hygrometer which has the hygrometer structural member which concerns on 1st Embodiment of this invention, and the environmental test apparatus provided with the hygrometer. It is a longitudinal cross-sectional view which shows the internal structure of the hygrometer structural member of FIG. It is an expanded sectional view which shows the front-end | tip part inside of the protective tube of FIG. (A) IV-IV sectional drawing of FIG. 3, (b) is a modification of (a). It is a top view of the thermal radiation part of FIG. 2, and its peripheral part. FIG. 3 is a right side view of the heat radiating unit of FIG. 2. It is a longitudinal cross-sectional view which shows the internal structure of the hygrometer structural member which concerns on 2nd Embodiment of this invention. It is an expanded sectional view which shows the front-end | tip part inside of the protective tube of FIG. It is the IX-IX sectional view taken on the line of FIG.

  Hereinafter, a hygrometer component, a hygrometer, and an environmental test apparatus according to an embodiment of the present invention will be described in more detail with reference to the drawings.

(First embodiment)
The environmental test apparatus shown in FIG. 1 includes a chamber 100 having a measurement space 101, a control unit (not shown) for controlling the temperature and humidity of the measurement space 101, and a hygrometer for measuring the humidity in the measurement space 101. 1.

  The chamber 100 is a hollow casing having a measurement space 101 therein, and includes a heat insulating wall 102 having heat insulation surrounding the measurement space 101. The measurement space 101 is insulated from the external space 103 by the heat insulating wall 102.

  The hygrometer 1 is an apparatus for measuring the relative humidity (humidity) in the measurement space 101 inside the chamber 100 of the environmental test apparatus.

  The hygrometer 1 includes a measurement unit 2 that measures the temperature inside the measurement space 101 of the chamber 100, and an arithmetic device 3 that calculates humidity from the temperature measured by the measurement unit 2.

  The measurement unit 2 includes a dry bulb temperature measurement unit 4 that measures the dry bulb temperature of the measurement space 101 and a heat pipe temperature measurement unit 5 that measures the temperature of the heat pipe 11 used for humidity calculation.

  The dry bulb temperature measurement unit 4 is installed in the measurement space 101 and includes a temperature sensor 7 that measures the temperature in the measurement space 101 and a protective tube 8 that covers the temperature sensor 7. The protective tube 8 is a sealed tube made of a material having good thermal conductivity such as stainless steel. The temperature sensor 7 is connected to the end of the electric wire 9. The electric wire 9 is drawn out of the measurement space 101 through the inside of the protective tube 8. The inside of the protective tube 8 may communicate with the measurement space 101.

  The calculation device 3 includes a storage unit 31 that stores information about the temperature sent from the measurement unit 2, a calculation unit 32 that calculates relative humidity using information about the temperature stored in the storage unit 31, and a calculation unit 32. And an output unit 33 that outputs information on the relative humidity obtained in (1).

  The storage unit 31 includes a dry bulb temperature storage unit 31 a that stores information on the dry bulb temperature sent from the temperature sensor 7 of the dry bulb temperature measurement unit 4 via the electric wire 9, and a heat pipe temperature measurement unit 5 described later. A heat pipe temperature storage unit 31b for storing information on the heat pipe temperature sent from the temperature sensor 12 via the electric wire 17;

  The calculation unit 32 uses the dry bulb temperature stored in the dry bulb temperature storage unit 31a and the heat pipe temperature stored in the heat pipe temperature storage unit 31b to calculate according to a predetermined calculation formula, so that the inside of the measurement space 101 Calculate the relative humidity.

  The output unit 33 includes a display or a printer. The output unit 33 outputs information on the relative humidity obtained by the calculation unit 32 by displaying it on a display or printing it from a printer.

  The heat pipe temperature measurement unit 5, the calculation unit 32, and the output unit 33 constitute a hygrometer component that measures the heat pipe temperature.

  As shown in FIGS. 2 to 6, the heat pipe temperature measuring unit 5 includes a heat pipe 11 attached so as to extend from the inside to the outside of the chamber 100 through the heat insulating wall 102 of the chamber 100, and the heat pipe. 11, a temperature sensor 12 attached to an inner portion of the chamber 100, a protective pipe 14 protecting the heat pipe 11 and the temperature sensor 12 inside the chamber 100, and a heat radiating portion attached to an outer portion of the heat pipe 11. 13 and a filler 15 filled in a gap 16 between the protective tube 14 and the heat pipe 11.

  The heat pipe 11 is a heat transfer member capable of conducting heat between the inside and the outside of the measurement space 101 of the chamber 100, the first portion 11 a disposed inside the measurement space 101 of the chamber 100, and the measurement It has the 2nd part 11b arrange | positioned in the external space 103 thermally insulated by the heat insulation wall 102 from the space 101, and the 3rd part 11c passing through the inside of the heat insulation wall 102.

  The tip of the first portion 11a of the heat pipe 11 has a hemispherical shape or a flat disk shape.

  The heat pipe 11 is configured to enclose a working fluid and cause a heat pipe phenomenon, and the first part 11 a and the second part 11 b are connected via a third part 11 c that penetrates the inside of the heat insulating wall 102. It has a structure that allows heat transfer between them. Specifically, the heat pipe 11 is configured by enclosing a working fluid such as water as a heat transfer medium in a depressurized state inside a sealed thin tube made of a material having good thermal conductivity such as copper. . The heat pipe 11 has a first portion 11a protruding into the measurement space 101 and a measurement space 101 by circulating the inside of the tube while evaporating and condensing working fluid such as water enclosed in the thin tube. It is possible to cause a heat pipe phenomenon in which heat is transferred between the second portion 11 b protruding into the external space 103. The outer surface temperature of the tip of the first portion 11a of the heat pipe 11 (the portion where the working fluid evaporates) has a certain relationship with the dew point of the surrounding air. The temperature sensor 12 detects this temperature.

  The temperature sensor 12 is attached to the surface of the end portion 11a1 of the first portion 11a of the heat pipe 11, and functions as a temperature detection unit that detects the temperature of the surface of the end portion 11a1 of the first portion 11a. The temperature sensor 12 is composed of a sheet-like or belt-like thermocouple. The temperature sensor 12 is a rectangular sheet having a substantially uniform thickness. Further, the temperature sensor 12 can be easily bent and can follow the outer periphery of the heat pipe 11. Furthermore, as shown in FIG. 4A, the temperature sensor 12 is in contact with a part of the outer periphery of the heat pipe 11, and the other part of the outer periphery is in contact with the filler 15.

  The temperature sensor 12 is bonded to the surface of the end portion 11a1 of the first portion 11a of the heat pipe 11 or is fixed using a seal or the like. Thereby, the temperature sensor 12 is thermally connected to the heat pipe 11. An electric wire 17 is connected to the temperature sensor 12. As shown in FIG. 1, the electric wire 17 passes through the gap 16 between the heat pipe 11 and the protective tube 14, is drawn out of the chamber 100, and is connected to the heat pipe temperature storage unit 31 b of the arithmetic device 3. .

  Further, as shown in FIGS. 3 and 4A, the temperature sensor 12 is held between the surface of the first portion 11a of the heat pipe 11 and the protective tube 14, so that the heat pipe The risk of falling off the surface of 11 is reduced.

  In addition, the temperature sensor 12 is preferably in a shape having a small heat capacity (for example, a thin sheet shape or an extremely fine line shape) because heat is easily transmitted from the protective tube 14 to the heat pipe 11. For example, the thickness of the temperature sensor 12 is preferably about 0.1 to 0.2 mm.

  The protective tube 14 is a cylindrical member whose one end is closed. That is, one end portion 14a of the protective tube 14 is closed, and an opening 14c is formed in the other end portion 14b. The opening 14 c communicates with the space portion 14 d inside the protective tube 14.

  The heat pipe 11 is inserted into the space portion 14d through the opening 14c of the protective tube 14 in a state where the temperature sensor 12 is attached. In this state, the protective tube 14 covers the first portion 11a of the heat pipe 11 and the temperature sensor 12 attached to the surface of the first portion 11a. Further, the protective tube 14 shown in FIG. 2 also covers the third portion 11c of the heat pipe 11 passing through the inside of the heat insulating wall 102.

  The protective tube 14 is made of a metal having good thermal conductivity and corrosion resistance, such as a metal material such as stainless steel. The thickness of the protective tube 14 is preferably thin so that heat inside the measurement space 101 can be easily transferred to the heat pipe 11 inside the protective tube 14, and is preferably 0.3 mm or less, for example.

  The inner diameter of the protective tube 14 is set to be slightly larger than the outer diameter of the heat pipe 11 so that the heat pipe 11 can be inserted with the temperature sensor 12 attached. A gap 16 is formed between the heat pipe 11 and the protective tube 14. The width δ (see FIG. 3) of the gap 16 is set to about 0.2 to 0.4 mm so that the temperature sensor 12 having a thickness of about 0.1 to 0.2 mm can be inserted, for example.

  A gap 16 between the heat pipe 11 and the protective tube 14 is filled with a heat conductive filler 15. Note that after filling the gap between the heat pipe 11 and the protective tube 14 with the filler 15, the heat pipe 11 may be expanded to narrow the gap.

  Of the heat pipe 11, the first portion 11 a disposed inside the measurement space 100 of the chamber 100 and the third portion 11 c penetrating the heat insulating wall 102 of the chamber 100 are formed on the inner surface 14 e of the protective tube 14 via the filler 15. In contact and thermally connected. This makes it possible to conduct heat from the protective tube 14 to the heat pipe 11 via the filler 15. Here, as shown in FIG. 3 and FIG. 4A, the temperature sensor 12 is sandwiched and held between the surface of the first portion 11 a of the heat pipe 11 and the protective tube 14. The material 15 is distributed in other locations on the peripheral surface of the first portion 11a of the heat pipe 11 except for the location where the temperature sensor 12 is disposed. The outer peripheral portion of the temperature sensor 12 is surrounded by the filler 15.

  Note that the thickness of the temperature sensor 12 may be set to be smaller than the width δ of the gap 16 between the heat pipe 11 and the protective tube 14 as shown in FIG. In other words, the entire circumference of the heat pipe 11 may be covered with the filler 15.

  Further, as shown in FIG. 1, the surface of the electric wire 17 connected to the temperature sensor 12 is covered with a filler 15.

  As the filler 15, a material having thermal conductivity is employed, and for example, magnesium oxide or heat transfer grease is used.

  Moreover, if the thermal conductivity of the filler 15 is in the range of 0.84 to 3.0 W / mK, it is preferable because the thermal conductivity is good and the material cost can be suppressed. If the thermal conductivity is less than 0.84 W / mK, it is difficult to conduct heat from the protective tube 14 to the heat pipe 11 well, while if it exceeds 3.0 W / mK, the material cost is suppressed. Therefore, the above range is preferable from the viewpoint of achieving both thermal conductivity and material cost.

  The heat radiating part 13 is connected to the second part 11 b of the heat pipe 11 and receives heat from the second part 11 b to radiate heat to the external space 103. The heat dissipating unit 13 has a heat capacity of such a magnitude that the measured temperature of the temperature sensor 12 of the heat pipe temperature measuring unit 5 does not fluctuate according to the change in the amount of heat dissipated from the measurement space 101 of the chamber 100, and The tip 11 a 1 of the first portion 11 a of the pipe 11 is designed to have a heat radiation amount that can be cooled to a dew point or less in the environment inside the measurement space 101.

  Specifically, the heat radiation unit 13 includes two members that sandwich the heat pipe 11 from above and below, that is, an upper member 21 and a lower member 22.

  The upper member 21 and the lower member 22 basically have a vertically symmetrical shape. That is, the upper member 21 includes a main body portion 21a having a concave portion opened downward, and a plurality of thin rod-like cooling fins 21b protruding upward from the upper surface of the main body portion 21a. On the other hand, the lower member 22 includes a main body portion 22a having a concave portion opened upward, and a plurality of rod-shaped cooling fins 22b protruding downward from the lower surface of the main body portion 22a. The upper member 21 and the lower member 22 are coupled together by screws 26 in a state where the main body portions 21a and 22a are superposed on each other.

  Further, in a state where the main body portion 21a of the upper member 21 and the main body portion 22a of the lower member 22 are coupled, the respective concave portions communicate with each other, whereby the space portion 23 is formed. The space 23 is filled with a filler 24 having thermal conductivity such as heat transfer grease. An opening 25 communicating with the space portion 23 is formed in the heat radiating portion 13. Through this opening 25, the end portion 11 b 1 of the second portion 11 b of the heat pipe 11 and the vicinity thereof are inserted into the space portion 23. The heat of the second portion 11 b of the heat pipe 11 is transmitted to the upper member 21 and the lower member 22 through the filler 24. The heat transmitted to the upper member 21 and the lower member 22 is released from the cooling fins 21b and 22b to the external space 103 of the chamber 100.

  As described above, in the heat radiating portion 13, the heat of the second portion 11 b of the heat pipe 11 can be satisfactorily transmitted to the upper member 21 and the lower member 22 through the filler 24. In addition, each of the upper member 21 and the lower member 22 includes a plurality of needle-like cooling fins 21b, and the upper member 21 and the lower member 22 can radiate heat in a wide range both above and below the heat pipe 11. The heat dissipation effect of the heat dissipating part 13 is greatly improved as compared with the conventional flat plate heat sink.

  The characteristics of the hygrometer component provided with the heat pipe temperature measuring unit 5 of the first embodiment are as follows (1) to (5).

(1)
In the hygrometer component of the first embodiment, the temperature sensor 12 is attached to the surface of the first portion 11 a arranged in the measurement space 101 in the heat pipe 11, and the first portion 11 a and the temperature sensor 12 are protected by the protective tube 14. Since it is covered, the corrosion of the heat pipe 11 and the drop-off of the temperature sensor 12 in the measurement space 101 can be prevented.

  Moreover, the first portion 11 a of the heat pipe 11 is thermally connected to the protective tube 14 via the filler 15, that is, via the thermally conductive filler 15 so that heat is conducted from the protective tube 14. Since it is in contact with the inner surface 14e of the protective tube 14, it is possible to conduct heat from the protective tube 14 to the heat pipe 11 without interposing an air layer. Therefore, the deviation between the measured temperature obtained by the temperature sensor 12 attached to the heat pipe 11 and the actual temperature inside the measurement space 101 is reduced. Therefore, the followability to the temperature change in the measurement space 101 in the temperature sensor 12 is improved, and accurate measurement of the heat pipe temperature used for humidity calculation is possible.

(2)
Moreover, in the hygrometer component of the first embodiment, the filler 15 is filled between the heat pipe 11 and the protective tube 14, so that the first portion 11 a of the heat pipe 11 and the protective tube 14 are in close contact with each other. This eliminates the need to improve assembly workability.

(3)
In the hygrometer component of the first embodiment, the temperature sensor 12 is sandwiched and held between the surface of the first portion 11 a of the heat pipe 11 and the protective tube 14. It is possible to stabilize the temperature sensor 12 holding state.

(4)
In the hygrometer component of the first embodiment, the heat pipe 11 is employed as the heat transfer member. Since the heat pipe 11 is usually made of copper having good thermal conductivity, it is particularly susceptible to corrosion if an environmental test is used while exposed to the measurement space. In the first embodiment, the heat transfer member is used. Since the first portion of the heat pipe is covered with the protective tube, corrosion of the heat pipe in the measurement space 101 can be prevented.

(5)
In the hygrometer component of the first embodiment, since the protective tube 14 is made of a metal having corrosion resistance, the protective tube 14 is not easily corroded even if it is exposed inside the measurement space 101.

  In the hygrometer 1 of the first embodiment, the calculation unit 32 calculates based on the heat pipe temperature measured by the hygrometer component and the dry bulb temperature measured by the dry bulb temperature measurement unit 4. This makes it possible to accurately measure humidity.

  Furthermore, in the environmental test apparatus according to the first embodiment, it is possible to perform an environmental test under a finer humidity condition in the measurement space 101 based on the humidity accurately measured by the hygrometer 1 described above.

(Second Embodiment)
In the first embodiment, the first portion 11a of the heat pipe 11 is indirectly in contact with the inner surface 14e of the protective tube 14 via the filler 15 so that heat is conducted from the protective tube 14. However, the present invention is not limited to this, and the first portion 11a of the heat pipe 11 is in direct contact with the inner surface of the protective tube as in the second embodiment below. May be.

  The hygrometer of the second embodiment is a heat pipe in which the heat pipe temperature measuring unit 5 of the hygrometer component is the heat pipe shown in FIGS. 7 to 9 among the configurations of the hygrometer 1 of the first embodiment shown in FIG. The temperature measurement unit 40 is replaced. The other configuration is the same as the configuration of the hygrometer 1 of the first embodiment shown in FIG.

  In the heat pipe temperature measuring unit 40 of the hygrometer component shown in FIGS. 7 to 9, the first portion 11 a of the heat pipe 11 is in close contact with the inner surface of the protective tube 44 in a place where the temperature sensor 12 does not exist. Direct contact. In a place where the temperature sensor 12 exists, the temperature sensor 12 is sandwiched between the first portion 11 a and the protective tube 44. In other respects, the configuration is the same as the configuration of the heat pipe temperature measurement unit 5 of the first embodiment, and thus the description thereof is omitted.

  7 to 9 show examples in which the temperature sensor 12 is disposed below the heat pipe 11, but the present invention is not limited to this, and the temperature sensor 12 is formed on the surface of the heat pipe 11. It only has to be attached.

  The peripheral surface of the first portion 11 a disposed in the measurement space 100 of the chamber 100 in the heat pipe 11 is thermally connected to the inner surface 44 e of the protective tube 44 by being in close contact with the inner surface 44 e of the protective tube 44. Yes.

  Here, if at least a part of the peripheral surface of the first portion 11 a of the heat pipe 11 is in close contact with the inner surface of the protective tube 44, thermal connection between the heat pipe 11 and the protective tube 44 can be obtained.

  In other respects, the protective tube 44 has the same configuration as the protective tube 14 of the first embodiment.

  7 to 9, the temperature sensor 12 is attached to the end portion 11 a 1 of the first portion 11 a of the heat pipe 11, and the first portion 11 a is an opening of the protective tube 44. The first portion 11a of the heat pipe 11 and the inner surface 44e of the protective tube 44 are processed to be in close contact with each other in a state of being inserted into the space portion 44d through 44c.

  For example, the heat pipe 11 having an outer diameter that can be inserted by being manually pushed into the protective tube 44 is prepared, and the first portion 11a of the heat pipe 11 is inserted into the protective tube 44, and then the heat is a sealed tube. The pipe 11 is heated to thermally expand the heat conduction medium inside the heat pipe 11, and the heat pipe 11 is plastically deformed (so-called bulge forming) along the temperature sensor 12, thereby closely contacting the inner surface 44 e of the protective tube 44. Let As a result, the entire outer peripheral surface of the first portion 11 a of the heat pipe 11 can be easily and reliably brought into close contact with the inner surface 44 e of the protective tube 44. Note that a filler may be filled between the protective tube 44 and the heat pipe 11.

  In a state in which the entire outer peripheral surface of the first portion 11a of the heat pipe 11 is in close contact with the inner surface 44e of the protective tube 44, the temperature sensor 12 has a surface of the first portion 11a of the heat pipe 11 as shown in FIGS. Between the heat pipe 11 and the protective tube 44, the possibility of falling off from the surface of the heat pipe 11 is reduced.

  As another contact method, for example, after the first portion 11a of the heat pipe 11 is inserted into the protective tube 44, the first portion 11a of the toe pipe 11 is protected by partially denting the protective tube 44 from the outside to the inside. The inner surface 44e of the tube 44 may be partially adhered. In this case, since a gap is formed in the other portion where the protective tube 44 and the heat pipe 11 are not in close contact with each other, the thermal conductivity is improved by filling the gap with a thermally conductive filler. Can be achieved.

  As described above, in the hygrometer component having the heat pipe temperature measuring unit 40 of the second embodiment, the first portion 11a of the heat pipe 11 is in close contact with the inner surface 44e of the protective tube 44, thereby The inner surface 44e is contacted so as to conduct heat, that is, is thermally connected. As a result, heat can be directly conducted from the protective tube 44 to the heat pipe 11. Therefore, the followability to the temperature change in the measurement space 101 in the temperature sensor 12 is improved, and the heat pipe temperature used for the humidity calculation can be accurately measured.

  In addition, the hygrometer component of the second embodiment also exhibits the effects described in the features (1) and (3) to (5) of the hygrometer component of the first embodiment. Is possible.

  In the first and second embodiments, the heat pipe 11 is described as an example of a heat transfer member capable of conducting heat between the inside and the outside of the measurement space 101 of the chamber 100. However, the present invention is not limited to this, and a heat transfer member having another structure may be used as long as the working fluid is enclosed and the heat pipe phenomenon can be generated.

  Further, in the heat radiation part 13 in the first and second embodiments, the space part 23 formed by the concave parts of the main body parts 21a and 22a of the upper member 21 and the lower member 22 is filled with a filler 24 such as heat transfer grease. Although heat transfer from the heat pipe 11 to the upper member 21 and the lower member 22 is performed via the filler 24, the present invention is not limited to this. As a modification of the heat radiating part 13, a groove or a hole is formed in a solid block-shaped heat radiating component, and the heat pipe 11 is brought into close contact with the inner surface of the groove or the hole so that heat transfer from the heat pipe 11 to the heat radiating component It may be improved.

  In addition, the protective tubes 14 and 44 in the first and second embodiments are not only the first portion 11 a disposed in the measurement space 101 of the chamber 100 in the heat pipe 11 but also the third portion that penetrates the heat insulating wall 102. Although the portion 11c is also covered, the present invention is not limited to this, and the protective tubes 14 and 44 may cover only the first portion 11a. Moreover, you may provide the protective tubes 14 and 44 in the 2nd part 11b arrange | positioned outside the measurement space 101. FIG.

DESCRIPTION OF SYMBOLS 1 Hygrometer 2 Measurement part 11 Heat pipe 11a 1st part 11b 2nd part 12 Temperature sensor (temperature detection part)
13 Heat radiation part 14 Protective tube 14e Protective tube inner surface 15 Filler 44 Protective tube 44e Protective tube inner surface 100 Chamber 101 Measurement space 102 Heat insulation wall 103 External space

Claims (8)

A hygrometer component for measuring humidity in a measurement space,
The working fluid is sealed and configured to cause a heat pipe phenomenon, and includes a first portion disposed in the measurement space and a second portion disposed in an external space insulated from the measurement space. And a heat transfer member for transferring heat between the first part and the second part,
A temperature detector attached to the surface of the first part of the heat transfer member and detecting the temperature of the first part;
A protective tube covering the first portion of the heat transfer member and the temperature detection unit;
A heat radiating part connected to the second part of the heat transfer member, receiving heat from the second part and radiating heat to the external space;
The first portion of the heat transfer member is thermally connected to the protective tube;
Hygrometer component. Between the heat transfer member and the protective tube, a thermally conductive filler is filled,
The first portion of the heat transfer member is thermally connected to the protective tube via the filler.
The hygrometer component according to claim 1. At least a part of the peripheral surface of the first portion of the heat transfer member is in close contact with the inner surface of the protective tube,
The hygrometer component according to claim 1. The temperature detection unit is sandwiched and held between the surface of the first portion of the heat transfer member and the protective tube,
The hygrometer component according to claim 2 or 3. The heat transfer member is a heat pipe.
The hygrometer component according to any one of claims 1 to 4. The protective tube is made of a metal having corrosion resistance,
The hygrometer component according to any one of claims 1 to 5. A hygrometer for measuring humidity in a measurement space,
The hygrometer component according to any one of claims 1 to 6,
A dry bulb temperature measurement unit for measuring the dry bulb temperature of the measurement space;
An arithmetic unit that calculates the humidity of the measurement space based on the temperature of the first part measured by the hygrometer component and the dry bulb temperature of the measurement space measured by the dry bulb temperature measurement unit; Equipped with a hygrometer. A chamber having the measurement space insulated from the external space;
A control unit for controlling the temperature and humidity of the measurement space;
With a hygrometer for measuring the humidity in the measurement space,
The hygrometer comprises the hygrometer component according to any one of claims 1 to 6, a dry bulb temperature measurement unit that measures the dry bulb temperature of the measurement space, and the hygrometer component measured by the hygrometer component. A calculation unit that calculates the humidity of the measurement space based on the temperature of one part and the dry bulb temperature of the measurement space measured by the dry bulb temperature measurement unit;
Environmental test equipment.

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