JPH0521030Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to improvement of a constant temperature/humidity test device.

[Conventional technology] A test object such as a board containing an electronic circuit is housed in a storage chamber with a door, and this chamber is maintained at a predetermined temperature and humidity condition for a predetermined period of time to determine various physical properties of the test object. Constant temperature/humidity test equipment has been widely used to measure and investigate changes in . Most of the doors have a hinge structure attached to either the left or right side edge and are opened and closed by rotating in the horizontal direction. This is because there is no load variation, that is, torque variation, due to rotation angle, the added load to the swivel mechanism does not change, and the opening/closing operation is light and easy.

On the other hand, the electronic circuit boards and the like of the test object are placed vertically in a special rack such as a so-called card rack made of steel, and the rack is placed in a storage chamber for testing. Now, each time the board shape changes, a separate dedicated rack is prepared and replaced.

Due to the above configuration, there are many inconveniences and inconveniences in the operation of taking the test object into and out of the storage chamber.
That is, in the former door structure, it is necessary to leave a space within the opening/closing movement range of the door each time the door is opened/closed. Now, in order to take in and take out the test object, it is necessary to use a special workpiece with casters whose top surface is at almost the same height as the bottom of the storage chamber, and of course preparation and movement operations must be carried out. It's complicated.

Moreover, preparing many types of the above-mentioned dedicated racks,
This also has many disadvantages, such as the preparation itself being expensive, and the hassle of securing storage space, storage management, and replacement.

[Purpose of the invention] This invention was devised in view of the problems of the conventional equipment described above, and is a constant temperature and constant temperature device that does not require the dedicated workbench described above and also does not require the preparation of the various types of dedicated racks in principle. The purpose is to provide humidity testing equipment.

[Structure of the device] In order to achieve the above object, this device includes a door that is provided at the front of the storage chamber for the test object and that is configured to hold the plate-shaped upper surface in a substantially horizontal position when opened; A substantially horizontal surface on which the test object is placed is formed, and at least the upper surface of the horizontal surface is made of a material having electrical insulation properties and a general heat resistance of at least 80° C. A constant temperature/humidity test apparatus was constructed by including a shelf board that could be installed.

[Function of the invention] Therefore, the device of this invention becomes an easy-to-use workbench because when the door at the front of the storage chamber is opened, the plate surface of the door is held substantially horizontally. If consideration is given to the design, the top surface level of the door in the horizontal position can be made to be on the same level as the bottom surface of the storage chamber, which is even more convenient. In this state, the test object can be taken in and taken out and incidental work can be performed on the top of the door, eliminating the need for a separate dedicated workbench as in the past.

Furthermore, since the shelf board also has electrical insulation properties, even if the test object is an electronic circuit board, it can be placed directly on the shelf board. In this case, the shelf board is made of a heat-resistant material that has a temperature higher than 80 to 85 degrees Celsius, which is approximately the maximum control temperature of the test equipment, so that constant temperature and humidity tests can be conducted within the test equipment without any problems. Therefore, even if the shape and dimensions of the electronic circuit board etc. are changed to some extent, it can be placed directly on the shelf board without the need for many types of dedicated racks as in the prior art.

[Example] Hereinafter, an example of the apparatus of this invention will be described in detail based on FIGS. 1 and 2.

In order to accommodate various test objects 1, a rectangular parallelepiped-shaped storage chamber 5 with a door 3 on the front side is provided.

The upper, lower, left and right walls of the storage chamber 5 are surrounded by a heat insulating material 7 and an exterior plate 9 which also serves as an outer wall. There is a door 3 on the front side of the containment room 5 (left side in Figure 1).
is attached so that it can be rotated to open and close. In this case, the door 3 is a thick rectangular plate-like body as shown in the figure, and pins 11 are provided on both left and right sides near the bottom of the door 3. It is pivotally supported by left and right brackets 13 at the lower front side of the exterior plate 9 on both sides of the storage chamber 5. Both the front and back sides of the door 3 are made of steel plates, and the middle is filled with a heat-resistant material 17. Further, on the back side of the door 3, that is, on the side in contact with the storage chamber 5 side, an interior panel 19 made of glass fiber reinforced epoxy resin is formed into a flanged hat-shaped cross section and is attached.

The rear wall plate 21 (the wall plate on the right side in FIG. 1) in the storage chamber 5 is made of steel, but as shown in the figure, it is not provided with a heat insulating layer. That is, it is used as a part of the wall surface which is a heat dissipation surface for cooling described later. This rear wall 2
An electric heater 23 serving as a heater for raising the temperature of the storage chamber 5 is disposed horizontally at a height near the center of the storage chamber 1 . The range below the electric heater 23 in the storage chamber 5 is formed one step lower, and the humidifier 2 is installed here.
5 is provided. The humidifying device 25 consists of a humidifying water tank 27 containing a built-in electric heater for temperature raising (not shown).

A stirring device 29 for homogenizing the atmosphere inside the storage chamber 5 is disposed above the electric heater 23 . The stirring device 29 is composed of a motor 31, a long shaft 33, a propeller 35 attached to the tip thereof, and a first partition wall 37 disposed vertically between the periphery of the propeller 35 and the inner wall of the storage chamber 5. First partition wall 37
A slight gap is left between the lower edge of the humidifying water tank 27 and the humidifying water tank 27 to form a stirring airflow passage. A propeller 39 for cooling the main body of the motor 31 is attached to the rear of the motor 31.

Further rearward of the rear wall surface 21 of the storage chamber 5 (the first
(on the right side of the figure), with a slight gap between the second
A partition plate 41 is arranged vertically. The gap between the rear wall surface 21 and the second partition plate 41 is an air passage 43 for cooling the rear wall surface 21. Second
The area further behind the partition plate 41 (on the right side in FIG. 1) and the area around the air passage 43 is surrounded by a case 45 made of a steel plate, as shown in the figure. Inside this case 45,
A fan 47 is provided to introduce external air for cooling the rear wall surface 21.

In this case, the fan 47 is an axial fan, and external air is absorbed through a number of holes 49 provided on both sides of the case 45 near the middle height. The forced cooling device 53 is configured such that the air that has passed through the air passage 43 and cooled the rear wall surface 21 is discharged from a large number of holes 51 provided on both sides of the upper part of the case 45. In the case of this embodiment, a parallel fin type heat sink 55 is installed near the lower part of the rear wall surface 21 by penetrating the wall surface to increase the amount of heat dissipated through the walls. Of course, it may also be of some type, such as a heat pipe.

The upper part of the case 45, the stirrer 31
Above the humidification water tank 27, a water supply tank 57 is provided.
In addition, near the bottom of the case 45, a drainage tank 5 for receiving drainage from the humidification water tank 27, etc. is provided.
9 is provided.

Inside the storage chamber 5, a shelf board 65 is provided with leg members 61 on both left and right sides, and a shelf board 65 is arranged with the upper surface portion 63 horizontal so that it can be inserted into and taken out from the storage chamber 5 freely.
The shelf board 65 is made of glass fiber reinforced epoxy resin,
A large number of holes are provided for vertical ventilation.

When the door 3 is opened, its upper edge rotates toward the front (to the left in FIG. 1) as shown by the dotted line in FIG. 5. The surface facing the inside is held horizontally after being rotated toward the front. For this purpose, hinged arms 67 are mounted above both sides of the exterior plate 9 of the storage chamber 5. Only when the door 3 is opened, these left and right arms 67 suspend the door 3 from above both sides of the exterior plate 9 of the accommodation chamber 5 in an oblique posture and hold it horizontally. When the door 3 is closed, these arms 67 are configured to be folded near the outside of both side edges of the door 3.

Water is supplied from the water supply tank 57 to the humidifying water tank 27 by controlling a solenoid valve (not shown) provided in the middle of a connecting pipe (not shown) by a float switch (not shown). With this, the water surface of the humidifying water tank 27 is maintained at a predetermined level. In addition, in order to prevent overflow of the humidifying water tank 27 due to trouble with the solenoid valve, float switch, etc., an overflow pipe (not shown) is provided from the float chamber housing the float switch (not shown) to the drain tank 59. has been done.

In addition, for discharging water from the humidifying water tank 27 and drain tank 59, discharging water from a float chamber (not shown), and discharging condensed water from the inner bottom surface 69 of the accommodation chamber 5, a bottom exterior plate of the accommodation chamber is used. Drainage pipe 7 below 9
1 is provided. The drain pipe line 71 connects the drain ports 73, 75, 77, etc. at each location to a relay socket 79 provided near the center of the exterior plate 9 at the bottom of the storage chamber. Then, a plurality of rubber hoses 81 are connected to the relay socket 79 as a flexible conduit,
The other end of the hose 81 can be pulled out to the lower front side of the door 3 and hung down. This will drain water to the outside if necessary.

Specifically, an elongated recess 85 is provided in the front wall surface 83, which is a part of the exterior of the storage chamber 5 near the bottom of the door 3.
A long and narrow through hole 8 is formed in the vertical bottom surface 87 of this recess 85.
9 is opened, and a bracket 91 for fixing the other end of the hose is detachably provided therein. In this embodiment, the bracket 91 is attached and detached by attaching a magnetic chuck (not shown) to the bracket 91. A hose bracket 91 has a sleeve 95 for inserting the hose 81 attached to the seat plate. The hose 81 is inserted into the inner periphery of the sleeve 95 and fixed with a band. A rubber plug 97 is fitted to the other end of the sleeve 95, that is, the front end thereof, to open and close each hose 81. Note that the recess 8
A cover for covering the front surface of 5 may be fixed with screws or the like to improve the appearance and prevent malfunction. Further, each hose 81 is connected to the recess 85.
The length is made to have some slack, so that it can be pulled outward from the front and hung down. Although not shown, this device is equipped with piping for supplying water to various parts.

A controller 99 is provided for controlling the storage chamber 5 configured as described above, the other devices, the electric heater 23, the humidifier 25, the stirring device 29, the forced cooling device 53, and the like.
In this case, the controller 99 is disposed below the storage chamber 5 as shown in the figure, and controls the set temperature for a predetermined period of time using a humidity sensor (not shown) provided in each device, a built-in timer (not shown), etc. , performs humidity setting and other controls.

In the constant temperature/humidity test apparatus of this embodiment configured as described above, the door 3 is first operated as follows. In other words, pull the upper edge of door 3 toward you to approximately 90 degrees.
Rotate and open the door. The interior plate 19, which is the plate-like upper surface of the door 3, is now in a horizontal position. The left and right side edges of the door 3 are suspended from above both sides of the storage chamber 5 by hinged arms 67 to maintain the horizontal position. At this time, the pins 11 and brackets 13 are mounted on the upper surface of the interior board 19 in consideration of their shapes and locations, so that they are made to match the height of the internal bottom surface 69 of the storage chamber 5 as shown in FIG. It is structured as follows.

Therefore, the upper surface of the interior plate 19 of the door 3 in the horizontal position can be conveniently used as a workbench with an extremely appropriate height. That is, the shelf board 65 is pulled out from the storage chamber 5, and the electronic circuit board, which is the test object 1, is replaced and placed, the wiring for measurement is changed, and the like. In this case, interior board 1
9 is made of glass fiber-reinforced epoxy resin as described above and has a high degree of electrical insulation, allowing work to be performed much more safely and reliably than with conventional workbenches made of steel plates. For example, when connecting lead wires for measuring characteristic changes to an electronic circuit board, it is possible to prevent the lead wires from accidentally coming into contact with the surface of a steel plate workbench and causing trouble to the board due to leakage current from other parts. It can be done.

After completing the above-mentioned operations on the interior board 19, the shelf board 65 on which the new test object 1 is placed is pushed into the storage chamber 5, and the door 3 is closed, so that the next test can be resumed. Therefore, there is no need to move and remove the workbench as in the conventional method. Further, there is an empty space below the door 3 in the horizontal position, and there are no obstacles at the feet of the worker. Therefore, the above-mentioned operations can be carried out safely and easily on a tabletop or the like.

On the other hand, as described above, the shelf board 65 is also made of glass fiber reinforced epoxy resin in this case, so it has electrical insulation and heat resistance that are higher than the test conditions of this device. In other words, the insulation resistance is approximately 10 ¹³ to 10 ¹⁶ Ωcm in terms of volume resistivity, and the heat resistance is of course above 80°C, and the maximum operating temperature is approximately 120 to 155°C.
It has the performance of As a result, even if the test object 1 is an electronic circuit board, it can be directly placed on the shelf board 65 and tested without any problems.

In this case, the devices may be placed on the shelf board 65 by hand, or may be placed side by side at small intervals in a diagonal or vertical position using appropriate supports. Since it can be placed directly on the shelf board 65 in this way, even if the test object 1 is an electronic circuit board and its shape and dimensions change, it can be placed as is. Therefore, the complexity of preparing, storing, managing, replacing, etc. many types of dedicated racks, as in the prior art, is eliminated. In addition, since the mounting position can be set freely as described above, incidental operations such as connecting and disconnecting measurement wiring to a board for testing can be easily, quickly, and reliably performed.

The device of this invention is not limited to the one embodiment described above, and can be modified in various ways. For example, the hinged arm 67 may be replaced with a double-pipe arm that can extend and contract over its entire length, and placed below the left and right edges of the door 3 in a horizontal position, so as to support the door 3 diagonally from below. You can. In this case, since there is no hinged arm 67 on both sides of the top surface of the door 3,
The usability of the upper surface side of the door 3 is further improved. Alternatively, instead of the double tube type arm, a beam member that can be slid in the front and back direction may be provided at the lower part of both the left and right outer walls of the storage chamber 5, and the lower surface of the door 3 can be supported by this beam member. Furthermore, a lever with a counterweight or the like may be attached to both side edges of the door 3 to make the torque for opening and closing the door almost constant, so that the door can be opened and closed more easily and safely.

On the other hand, the shelf board 65 is not one level as shown in the figure, but two to two levels.
It is also possible to easily make it a multi-layer type with three layers and also make it detachable. In addition to the above materials,
It may also be made of glass fiber reinforced polyester resin.
Furthermore, a shelf board made of a steel plate base material coated with ceramics may be used. Alternatively, if the back surface of the shelf board is appropriately reinforced with a metal material, it can be made of a slightly soft material such as nylon, Teflon, or silicone rubber.
Furthermore, a ceramic plate can of course also be used.

[Effects of the invention] As is clear from the above explanation, according to the device of this invention, the door itself becomes a suitable workbench, there is no need for a separate dedicated workbench as in the past, and it can be easily used on a tabletop, etc. I can do various tasks. Furthermore, even if the shape and dimensions of the test object are changed, it can be placed on one type of shelf board. Therefore, it is not necessary to prepare many kinds of dedicated racks as in the conventional case, which is extremely convenient.

[Brief explanation of the drawing]

FIG. 1 is a side view including a partial cross section of one embodiment of the device of this invention, and FIG. 2 is a front view thereof. Explanation of main drawing symbols: 1 ... test piece, 3 ...
...door, 5...storage chamber, 19...interior panel (the plate-shaped upper surface of the door), 63...upper surface portion (of the shelf), 65...
…Shelf board.

Claims (1)

[Scope of utility model registration request] A door is provided at the front of the storage chamber for the test object and is configured to hold the plate-like upper surface in a substantially horizontal position when opened; and a door that forms a substantially horizontal surface on which the test object is placed; At least the upper surface portion thereof is made of a material having electrical insulation properties and a general heat resistance of at least 80°C or higher, and includes a shelf board that can be taken in and taken out of the storage chamber.・Constant humidity test equipment.