JP2003343965A - Constant-temperature vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constant-temperature vessel capable of reducing vibration transmitted to a test part as much as possible. <P>SOLUTION: This constant-temperature vessel is constituted in such a way that air in the vessel 3 of a thermal insulation box body 1 is circulated by a circulation fan 4, and a motor 51 for driving the circulation fan is loaded on an upper side of the thermal insulation box body. The driving motor is attached to a motor mounting plate 52, and a through hole 52b for a cushion material is formed in the motor mounting plate. Moreover, the cylindrical cushion material 56 having a recessed part 56a fitted into the through hole for the cushion material on its outer peripheral face is provided. A collar 57 is inserted into the through hole formed on shaft axis of the cushion material, a bolt 61 for a mounting plate is inserted from an upper side of the collar, and its tip is screw-fitted into the thermal insulation box body. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermostatic chamber in which air in a chamber of a heat insulating box is circulated by a circulation fan and a drive motor of the circulation fan is placed on the upper side of the heat insulating box. , A constant temperature chamber for testing electrical parts such as hard disks and precision parts at a set temperature.

[0002]

2. Description of the Related Art A conventional constant temperature oven will be briefly described with reference to FIG. FIG. 5 is a sectional view of a conventional constant temperature oven. The air in the storage 01 is circulated by the circulation fan 02. The drive motor 03 that drives the circulation fan 02 is arranged on the upper side of the heat insulation box body 04, and the mounting flange 03 of the drive motor 03 is installed.
a is fixed to the heat insulating box body 04 with bolts 06. Further, a cooler 07 and a heater 08 are installed in the air circulation path of the inside 01 to cool or heat the circulating air. A unit storage room 09 is arranged below the interior 01, and a compressor 011 and a condenser 012 that form a refrigeration cycle together with a cooler 07 are stored in the unit storage room 09. The compressor 011 and the condenser 012 are attached to a unit base 013, and the unit base 013 is fixed to a structural member 014 constituting the unit storage chamber 09 with bolts or the like. Further, a condenser fan 016 for cooling the condenser 012 and the like are mounted on the unit base 013.

When testing a test component such as an electric component such as a hard disk or a precision component, the test component is mounted on a component testing device (not shown), and the shelf 0 in the storage 01 is installed.
Store on top of 17. Then, the temperature inside the compartment 01 is adjusted by the cooler 07 and the heater 08 so that the temperature detected by the temperature detector 018 becomes a predetermined temperature. The test is performed while the test part is running.

[0004]

By the way, the vibration generated by the circulation fan 02, the drive motor 03, etc. may be transmitted to the test parts in the operating state via the heat insulating box 04, the shelf 017, the part testing device and the like. is there. Then, the vibration transmitted to the test component may adversely affect the test component during operation, and the product may be erroneously determined to be a defective product although it is a normal product.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a thermostatic chamber in which vibrations transmitted to test parts and the like can be reduced as much as possible.

[0006]

In the thermostatic chamber of the present invention, the air in the chamber (3) of the heat insulating box (1) is circulated by a circulation fan (4), and a drive motor (5) for the circulation fan (5).
1) is placed on the upper side of the heat insulation box. Then, the drive motor is attached to a motor mounting plate (52), a cushion material through hole (52b) is formed in the motor mounting plate, and an outer periphery of a recess (56a) fitted in the cushion material through hole is formed. Cushion material (5
6) is provided, the collar (57) is inserted into the through hole formed in the shaft center of the cushion material, the mounting plate bolt (61) is inserted from the upper side of the collar, and the tip thereof is a heat insulating box body. It is screwed to.

Further, the mounting flange (5
There is a case in which a through hole (51b) is formed in 1a), a motor bolt (53) is inserted into this through hole and screwed into a motor mounting plate, and a mounting flange is mounted on the motor mounting plate. .

Further, a motor mounting recess may be formed on the upper surface of the heat insulating box, and the cushion member may be disposed in the motor mounting recess.

The motor mounting recess is formed larger than the motor mounting plate, and the space between the upper surface of the motor mounting recess and the motor mounting plate is open at the outer peripheral surface thereof. There are cases.

The size of the upper surface of the case of the circulation fan may be substantially the same as or larger than that of the motor mounting recess.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a first embodiment of the thermostatic oven according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a constant temperature oven according to the first embodiment. 2 is an explanatory view of the constant temperature oven of FIG. 1, (a) is an enlarged view of a main part of FIG.
(B) is an enlarged cross-sectional view of the main part of the cushion material mounting portion,
(C) is sectional drawing of the cushion material in the state in which the collar was inserted, (d) is a top view of (c). FIG. 3 is a refrigerant circuit diagram of the thermostatic chamber.

The upper part of the constant temperature chamber is composed of a heat insulating box 1 having an open front surface. A front opening of the heat insulating box 1 is closed by a heat insulating door 2 so as to be openable and closable. Insulation box 1
An air circulation path is formed in the inner space of
By the circulation fan 4 arranged in this air circulation path, the inside 3
Air is circulating. The circulation fan 4 is arranged immediately below the ceiling wall 1 a of the heat insulating box 1. A shelf 5 is provided in the interior 3. In addition, a cooler 6 is installed in the air circulation path.
A heating heater 7 is arranged to cool or heat the circulating air. The temperature detector 8 detects the temperature of the interior 3. And this temperature detector 8
The control device (not shown) controls the cooler 6 and the heater 7 so that the detected value of is equal to the set value, and the internal temperature of the refrigerator is a desired value (for example, a temperature between 0 ° C and 60 ° C).
become.

On the other hand, a unit storage chamber 16 is formed in the lower part of the thermostat, that is, below the heat insulating box 1. The unit storage chamber 16 includes an angle member 17 that is a structural member.
The angle member 17 supports the heat insulating box body 1. Further, a plurality of main support legs 18 that support the unit storage chamber 16 are provided below the unit storage chamber 16.

A unit base 26 is arranged in the unit storage chamber 16, and a condenser 31, a compressor 32 and a condenser fan 33 are mounted on the unit base 26.
Etc. are placed and fixed. The condenser 31 and the compressor 32 together with the cooler 6 constitute a refrigeration cycle. A unit support leg 36 is attached to the unit base 26. Then, when the constant temperature cabinet is installed on the installation surface 41, the unit base 26 is supported by the unit support legs 36 without contacting the structural members such as the angle members 17 of the unit storage chamber 16.

Next, the refrigeration cycle of the constant temperature oven will be briefly described. As shown in FIG. 3, the refrigeration cycle is configured by connecting a compressor 32, a condenser 31, a capillary tube 43, which is a pressure reducing device, a cooler 6 and the like in sequence with a refrigerant pipe 44. Then, during the cooling operation, the condenser fan 3 for air-cooling the compressor 32 and the condenser 31.
3, the compressor 32 pressurizes the gaseous refrigerant and discharges it to the condenser 31. In this condenser 31, the refrigerant is air-cooled and liquefied, then flows into the capillary tube 43 to be decompressed, and then supplied to the cooler 6. In this cooler 6, the refrigerant takes heat from the surroundings, and then returns to the compressor 32 again. In this way, the cooler 6
Can cool the surrounding air.

A drive motor 51 for driving the circulation fan 4 is arranged above the heat insulating box 1. The structure for attaching the drive motor 51 to the heat insulating box 1 will be described with reference to FIG. A metal motor mounting plate 52 is disposed below the drive motor 51, and a bolt hole 52a is formed through the motor mounting plate 52.
A through hole 51b is formed in the mounting flange 51a of the drive motor 51. Then, the motor bolt 53
Is inserted from above the through hole 51b of the mounting flange 51a and screwed into the bolt hole 52a of the motor mounting plate 52, and the tip of the motor bolt 53 is projected below the lower surface of the motor mounting plate 52.

A plurality of cushion material through holes 52b are formed in the peripheral portion of the motor mounting plate 52. A cylindrical cushion rubber 56 is attached to the through hole 52b for cushion material as a cushion material. The cushion rubber 56 has a substantially circular cross-sectional shape, and a ring-shaped recess 56a is formed on the outer peripheral surface thereof. A disc-shaped upper cushion portion 56b is formed on the upper side of the hollow portion 56a, and a truncated cone-shaped lower cushion portion 56c is formed on the lower side of the hollow portion 56a.

When the cushion rubber 56 is mounted on the motor mounting plate 52, the recess 56a is fitted into the cushion material through hole 52b, and the cushion rubber 56 is arranged with its axial center in the vertical direction. Therefore, the motor mounting plate 52 is sandwiched between the upper cushion portion 56b and the lower cushion portion 56c. A through hole is formed along the axis of the cushion rubber 56, and the collar 57, which is a metal cylinder, is inserted into the through hole.
The mounting plate bolt 61 is inserted from the upper side of the collar 57, and its tip is screwed into the top wall 1a of the heat insulating box 1. Therefore, the tightening force of the mounting plate bolt 61 is equal to that of the collar 57.
The cushion rubber 56 is hardly added to the cushion rubber 56.
As a result, the cushion rubber 56 is not crushed more than necessary by the mounting plate bolt 61, and the optimum cushioning property can be maintained.

Further, since the motor mounting plate 52 does not come into direct contact with the collar 57, the mounting plate bolt 61, the heat insulating box body 1 and the like, vibrations from the drive motor 51 and the circulation fan 4 are transmitted to the heat insulating box body 1. It can be prevented as much as possible. The drive shaft of the drive motor 51 penetrates the motor mounting plate 52 and the top wall 1a of the heat insulating box 1, and is connected to the rotary shaft of the circulation fan 4.

When testing a test component such as an electric component such as a hard disk or a precision component in a constant temperature chamber, the test component is mounted on a component tester (not shown) and stored on the shelf 5 in the chamber 3. . Then, the cooler 6 and the heater 7 are arranged so that the detected value of the temperature detector 8 becomes a predetermined temperature.
The temperature inside the refrigerator 3 is adjusted by. Further, the test is performed while the test parts are in operation.

In the thermostatic oven of the first embodiment having such a structure, the mounting flange 51a of the drive motor 51 arranged above the heat insulating box 1 is larger than the lower surface of the drive motor 51. The motor mounting plate 52 is mounted on the upper surface of the mounting plate 52, and is mounted on the heat insulating box body 1 in a state of being sandwiched by the upper cushion portion 56b and the lower cushion portion 56c of the cushion rubber 56. Therefore, the vibration of the drive motor 51 and the vibration of the circulation fan 4 are first attenuated when being transmitted from the mounting flange 51a to the motor mounting plate 52, and then the vibration transmitted to the motor mounting plate 52 is large. The vibration from the motor mounting plate 52 is damped by the cushion rubber 56. Since the motor mounting plate 52 is supported by the cushion rubber 56, the motor mounting plate 52 is not in metal contact with the mounting plate bolts 61 and the like, and the vibration can be efficiently damped. Therefore, the drive motor 51
Can be prevented as much as possible from being transmitted to the heat insulating box body 1. As a result, the drive motor 5
The vibration of 1 and the vibration of the circulation fan 4 are less likely to be transmitted to the test parts in the refrigerator 3, and the test parts are normal products, but are prevented from being erroneously determined to be defective products. can do.

A gap is formed between the lower surface of the motor mounting plate 52 and the top wall 1a of the heat insulating box 1, and the outer peripheral surface of this gap is open, so that warm air is discharged to the outside. To be done. Therefore, it is possible to prevent heat from accumulating between the motor mounting plate 52 and the heat insulating box 1, and also to prevent the heat of the drive motor 51 from being transferred to the heat insulating box 1.

Further, in the thermostatic chamber of the embodiment, in the installed state, the unit base 26 is not in contact with the angle member 17 or the like which is the structural member of the unit storage chamber 16, so that the condenser fan on the unit base 26 is in contact. The vibration of the motor of 33 and the compressor 32 is not transmitted to the angle member 17 via the unit base 26. Therefore, the vibration of the motor of the condenser fan 33, the compressor 32, and the like is less likely to be transmitted to the test components in the interior 3. As a result, it is possible to prevent as much as possible from being erroneously determined to be a defective product even though it is a normal product.

Next, the second embodiment of the thermostatic chamber according to the present invention
Will be described. FIG. 4 is an enlarged cross-sectional view of an essential part of an attachment portion of a cushion material of a thermostatic chamber according to the second embodiment. In the description of the second embodiment, constituent elements corresponding to those of the first embodiment will be designated by the same reference numerals, and detailed description thereof will be omitted. Further, FIG. 4 of the second embodiment is similar to FIG. 2 of the first embodiment.
It is drawing corresponding to (a).

By the way, in the first embodiment, the arrangement position of the drive motor 51 is raised by the cushion rubber 56 and the motor mounting plate 52, and the height of the entire constant temperature cabinet becomes bulky. Therefore, in the second embodiment, a motor mounting recess is formed on the upper surface of the heat insulating box 1 as described below, and the drive motor 51 is mounted in the motor mounting recess, so that the arrangement position of the drive motor 51 is minimized. It is low.

The motor mounting plate 5 is mounted on the top wall 1a of the heat insulating box 1.
A through hole 71 for attaching a motor larger than 2 is formed, and a support plate 72 is attached to the through hole 71 for attaching a motor. The support plate 72 is processed into sheet metal, and the cushion support portion 72a is formed.
Further, the cushion support portion 72a is provided with a mounting portion 72b which rises from the peripheral portion of the cushion supporting portion 72a and is attached to the heat insulating box body 1. Then, in the support plate 72, the mounting portion 72b is fixed to the heat insulating box 1 by the bolts 76, and the upper surface of the cushion supporting portion 72a is located below the upper surface of the ceiling wall 1a of the heat insulating box 1, The cushion support portion 72a serves as a motor mounting recess. And this cushion support 7
Similar to the first embodiment, the motor mounting plate 52 is fixed to 2a by the cushion rubber 56, the collar 57 and the mounting plate bolt 61. Further, the circulation fan 4 is a sirocco fan and sucks air from the lower surface and blows air from the peripheral surface thereof, but the upper surface of the case of the circulation fan 4 is formed larger than the motor mounting through hole 71. The direct contact of the air flow with the support plate 72 is prevented as much as possible. In this way, by reducing the contact of the air flow with the support plate 72, heat can enter from the outside or radiate to the outside through the support plate 72 whose heat insulation efficiency is lower than that of the heat insulating box body. What is done can be reduced as much as possible. The other configurations of the second embodiment are substantially the same as those of the first embodiment.

A gap is formed between the lower surface of the motor mounting plate 52 and the cushion support portion 72a, and the outer peripheral surface of this gap is open. Further, the peripheral portion of the motor mounting plate 52 and the support plate 72 are not in contact with each other, and a gap is formed. When the drive motor 51 is mounted in the motor mounting recess, the drive motor 51
Although there is a possibility that the heat from the motor and the heat from the interior 3 will be accumulated in the motor mounting concave portion, as described above, since the gap is formed between the motor mounting plate 52 and the support plate 72, this gap The warm air rises, and the heat from the drive motor 51 and the heat from the inside 3 are released to the outside. Therefore, it is possible to prevent the heat accumulated in the motor mounting recess from flowing into the interior 3 or exerting a thermal influence on the drive motor 51 as much as possible.

The embodiment of the present invention has been described in detail above.
The present invention is not limited to the above embodiment,
Within the scope of the present invention as set forth in the claims,
Various changes can be made. Modifications of the present invention are exemplified below. (1) In the embodiment, the cushion material is made of cushion rubber, but the material can be changed as appropriate. However, it is preferably rubber. Further, the materials of the motor mounting plate 52, the collar 57, and the support plate 72 can be appropriately selected. However, a metal is preferable in terms of strength. (2) In the embodiment, the pressure reducing device is a capillary tube, but it can be an expansion valve.

(3) The constant temperature chamber can be used for purposes other than testing electrical parts such as hard disks and precision parts. (4) In the embodiment, the cooler 6 and the heater 7
Both are provided, but they are not necessarily provided. However, it is preferable that at least one is provided. (5) The structure of the motor mounting recess of the heat insulating box 1 can be appropriately selected as long as the cushion rubber 56 can be mounted. For example, it is possible to form the support plate 72 made of sheet metal with a heat insulating material. However, it is preferable that the motor mounting recess is formed larger than the motor mounting plate 52 and does not directly contact the motor mounting plate 52. (6) In the second embodiment, the upper surface of the case of the circulation fan 4 is formed to be larger than the motor mounting recess, but it may be substantially the same size as the motor mounting recess. The type of the circulation fan 4 can be appropriately selected, but a sirocco fan is preferable.

[0030]

According to the present invention, the drive motor of the circulation fan is attached to the motor mounting plate, and the recessed portion of the cushion material is fitted in the through hole for the cushion material of the motor mounting plate. Therefore, the vibrations of the circulation fan and the drive motor are attenuated when they are transmitted from the drive motor to the motor mounting plate, and then the vibrations transmitted to the motor mounting plate are attenuated when they spread to the motor mounting plate. Vibration from the motor mounting plate is attenuated by the cushion material. Further, when the vibration is transmitted from the motor mounting plate to the cushion member, since there is no metal contact portion, the vibration can be damped more efficiently. Therefore, it is possible to prevent the vibration of the circulation fan, the drive motor, and the like from being transmitted to the test component via the heat insulating box or the like as much as possible. As a result, erroneous determination that the test part is a defective product is reduced even though the test part is a normal product. Moreover, since the collar is inserted into the through hole of the cushion material, it is possible to prevent the cushion material from being compressed more than necessary by tightening the mounting plate bolts. Therefore, the cushioning material is not crushed more than necessary, and the optimum cushioning property can be maintained.

Further, since the mounting flange of the drive motor is fixed to the motor mounting plate with the motor bolts, the vibration transmitted from the drive motor to the motor mounting plate is better than when it is fixed by welding or the like. It can be efficiently damped.

Since the motor mounting recess is formed on the upper surface of the heat insulating box and the cushion member is disposed in the motor mounting recess, the position of the drive motor can be minimized. As a result, the height of the entire constant temperature oven can be made as low as possible.

Further, since the outer peripheral surface of the space between the upper surface of the motor mounting recess and the motor mounting plate is open, it is possible to prevent warm air from staying in the space of the motor mounting recess as much as possible. it can. As a result, it is possible to prevent the heat accumulated in the motor mounting recess from flowing into the inside of the constant temperature chamber and from having a thermal effect on the drive motor.

The upper surface of the circulation fan case is
Since the size is approximately the same as or larger than the motor mounting recess, it is possible to prevent the air flow from the circulation fan from directly contacting the lower surface of the portion where the motor mounting recess is formed. . Therefore, the heat insulating efficiency of the portion where the motor mounting recess is formed is lower than that of the other portions, but the influence of the lowering of the heat insulating efficiency can be reduced as much as possible by not directly contacting the air flow.

[Brief description of drawings]

FIG. 1 is a sectional view of a constant temperature oven according to a first embodiment.

FIG. 2 is an explanatory view of the constant temperature oven shown in FIG. 1, and FIG.
Is an enlarged view of a main part of FIG. 3, (b) is an enlarged cross-sectional view of a main part of a cushion material mounting portion, (c) is a cross-sectional view of the cushion material with a collar inserted, and (d) is a plan view of (c) is there.

FIG. 3 is a refrigerant circuit diagram of a thermostatic chamber.

FIG. 4 is an enlarged cross-sectional view of a main part of a mounting portion of a circulating fan drive motor of a thermostatic chamber according to a second embodiment.

FIG. 5 is a sectional view of a conventional constant temperature oven.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Insulation box 3 Inside 4 Circulation fan 51 Drive motor 51a Drive motor mounting flange 51b Mounting flange through hole 52 Motor mounting plate 52b Motor mounting plate cushion material through hole 53 Motor bolt 56 Cushion rubber (cushion material) 56a Cushion rubber dent 57 Collar 61 Mounting plate bolt 72a Cushion support of support plate (motor mounting recess)

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3L045 AA04 BA08 CA02 DA02 EA01                       PA04                 5H605 AA04 AA05 BB05 CC03 CC08                       DD09 EA02 EA09 EA13 EA16                       EC18 FF08 GG06                 5H607 AA04 BB01 CC03 CC05 DD09                       DD18 FF04 JJ05 JJ07 JJ08                       JJ10 KK08

Claims (5)

[Claims] 1. A thermostatic chamber in which the air in the chamber of the heat insulation box is circulated by a circulation fan, and the drive motor of the circulation fan is placed on the upper side of the heat insulation box body. A cushion material through hole is formed in the motor mounting plate, and a cylindrical cushion material having a recessed portion that fits into the cushion material through hole is provided on the outer peripheral surface. A thermostatic chamber characterized in that a collar is inserted into a through hole formed in the shaft center, a mounting plate bolt is inserted from the upper side of the collar, and the tip of the bolt is screwed into a heat insulating box. 2. A through-hole is formed in the mounting flange of the drive motor, and a motor bolt is inserted into the through-hole and screwed into the motor mounting plate to mount the mounting flange on the motor mounting plate. The constant temperature oven according to claim 1, characterized in that. 3. The constant temperature oven according to claim 1, wherein a motor mounting recess is formed on the upper surface of the heat insulating box, and the cushion member is arranged in the motor mounting recess. . 4. The motor mounting recess is formed to be larger than the motor mounting plate, and the outer surface of the space between the upper surface of the motor mounting recess and the motor mounting plate is open. The constant temperature oven according to claim 3, wherein the constant temperature oven is provided. 5. The constant temperature oven according to claim 4, wherein the size of the upper surface of the case of the circulation fan is substantially the same as or larger than that of the motor mounting recess.