JPH0735936U - Environmental test equipment with blower shaft through hole as intake hole - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the thermal insulation performance of environmental test equipment and the durability of blower motors. [Structure] The high temperature bath is surrounded by a heat insulating wall 1 and a partition plate 2
It has a test room 3 and an air conditioning room 4 which are partitioned by. Motor 5
The shaft 6 passes through the through hole 7 of the heat insulating wall 1, and the blower 8 is attached to the tip portion thereof. The blower 8 sucks air from the test chamber 3 and discharges it into the air conditioning chamber 4 by the partition plate 2, and this air is blown into the test chamber and circulates. An intake hole 10 is provided in the motor mount 9 outside the heat insulation wall 1. 1
2 is a heater and 14 is an exhaust hole provided with a damper 13. [Effect] When the damper of the exhaust hole is opened and the blower is operated, the outside air is introduced from the suction hole through the through hole. As a result, another intake hole becomes unnecessary, and the motor is cooled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an environmental test in which a motor is mounted on the outside of a heat insulating wall, a shaft of the motor penetrates a through hole formed in the heat insulating wall, and a blower is attached to the tip of the hole to ventilate through an intake hole and an exhaust hole. With regard to the equipment, for example, environmental tests conducted by putting various kinds of electronic parts / equipment and their materials under a constant temperature environment, or performing external heat for cooling while carrying out heat treatment or screening, It is used as a high temperature constant temperature bath used for material evaluation and heat treatment in the production process while discharging unnecessary exhaust gas and mist generated from the sample from the bath.

[0002]

[Prior art]

The environmental test equipment is equipped with an air conditioner to keep the temperature and humidity inside the test room, etc., and the gas in the test room is circulated by a blower. In some cases, take in outside air to ventilate the room. Also, in a high temperature constant temperature bath, the test is usually conducted while taking in outside air for temperature control. As such a device, in a conventional high temperature oven, for example, as shown in FIGS. 9 to 11, a floor duct 30, a ceiling duct 31, a perforated plate duct 32, a ventilation intake hole 33 and an exhaust hole 34, a motor 5 blower 8 or the like attached to the distal end of the shaft 6 which extends through the insulating wall 1 is provided, or to circulate air tank 3 by rotation of the feed air blower, was or is ventilated. Then, as illustrated in FIG. 12, a shaft seal 35 made of a sealing material such as a Teflon blanket is provided in a portion where the shaft 6 penetrates the heat insulating wall 1 to shut off gas conduction to the outside.

However, in such a device, since the independent air intake hole 33 is provided in the heat insulating wall 1, the heat insulating property of the portion is deteriorated. Further, since the shaft penetrating portion is sealed, the heat of the high temperature environment in the tank, which is 200 to 300 ° C., is transmitted to the motor 5 via the shaft 6 as shown by the arrow in FIG. Temperature rises and tends to reduce the durability of the motor.

[0004]

[Problems to be solved by the device]

 It is an object of the present invention to solve the above problems in the prior art, and to provide an environmental test device having improved heat insulation performance and improved durability of a blower motor.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a motor according to claim 1, wherein a motor is mounted on the outer side of a heat insulating wall, and a shaft of the motor penetrates a through hole formed in the heat insulating wall and is provided at a tip portion thereof. In an environmental test device equipped with a blower and capable of ventilating outside air and internal gas through an intake hole and an exhaust hole, the blower includes a low pressure part near the shaft and the low pressure part apart from the shaft. 3. A device according to claim 2, wherein a high-pressure portion having a higher pressure than that of the portion is formed, and the through-hole has an opening that can be electrically connected to the outside of the heat-insulating wall, and the opening is the intake hole. In addition to the above, a damper with an adjustable opening mounted in the exhaust hole, a temperature detecting means mounted on a bearing portion of the motor, and the damper corresponding to the temperature detected by the temperature detecting means And a control means for controlling to open and close. According to the invention of claim 3, in addition to the features of the invention of claim 1, there is provided a test processing chamber and an air conditioning chamber which are partitioned by a partition member, the blower is provided in the air conditioning chamber, and the partition member is provided. Has at least an inner opening communicating with the low-pressure portion, and an outer opening between the partition member and the heat insulating wall is formed, and the device of claim 4 is characterized in that: The outer peripheral portion of the partition member has a bent portion that is bent in a gas flow direction, and the invention of claim 5 is characterized in that, in addition to the features of the invention of claim 1, the shaft includes the through hole. It is characterized in that the portion has a vane member that allows gas to flow from the outside to the inside of the heat insulating wall.

[0006]

[Action]

 According to the invention of claim 1, the blower forms the low-pressure portion near the shaft and the high-pressure portion at a position distant from the shaft, so that the vicinity of the shaft is on the gas suction side, and the portion away from the shaft in the radial direction is formed. It can be on the gas discharge side. On the other hand, the blower is attached to the motor shaft that penetrates the through hole of the heat insulating wall, and the through hole has an opening that allows communication with the outside. This gas circulates and a part of it is exhausted from the exhaust hole, so that the low-pressure part of the blower becomes a negative pressure against the external pressure, and the external gas is discharged from the opening communicating with the outside through the through hole. It is introduced and sucked into the low pressure part of the blower. As a result, the gas inside and outside the environmental test equipment is replaced and ventilation is performed. In this way, if the openings of the through holes are made into intake holes, it is not necessary to open extra through holes in the heat insulating wall as independent air intake holes, the heat insulating performance is improved and the structure is simplified. Further, since the outside air is introduced through the through hole, the shaft and the bearing portion of the motor are cooled, the heat of the high temperature environment inside is not transferred to the bearing portion of the motor, and the life of the motor is extended. The axial fan draws in gas from one direction and discharges it in the opposite direction, so the discharge side is the high pressure side. However, even on the discharge side, the part near the outer circumference of the blade becomes the high pressure part, while the part near the root of the blade near the shaft becomes the low pressure part. Therefore, when a part of the internal gas is discharged from the exhaust hole, the low pressure portion becomes lower than the external pressure. As a result, the outside air is introduced into the vicinity of the shaft of the axial fan, and the axial fan is an example of a blower to which the present invention is applied. Further, a double-suction type turbo fan or a multi-blade fan which has a suction port in the central portion and discharges from the outer peripheral portion can be used.

According to the second aspect of the invention, the temperature detecting means detects the temperature of the bearing portion of the motor, and the control means for adjusting the opening degree of the damper of the exhaust hole is provided in response to the temperature. If the temperature of the part rises, the damper opening increases and the amount of gas exhausted from the exhaust hole increases, and the amount of external gas sucked from the opening correspondingly increases, and the cooling effect of the motor bearing part increases. Increase. As a result, the temperature of the motor bearing portion is maintained within a predetermined range, and the durability of the motor is improved. In a high temperature constant temperature bath, etc., a damper is usually installed in the exhaust hole, and this is controlled by the temperature inside the bath.Therefore, the control means controls the temperature inside the damper based on the detected temperature of the bearing. It may be a correction means.

According to the third aspect of the present invention, the partition member for partitioning the air-conditioning chamber and the test processing chamber for performing the environmental test, the heat treatment and the like has an inner opening portion which is electrically connected to at least the low pressure portion near the shaft. In addition, since there is an outer opening between the partition member and the heat insulation wall, when the blower is rotated, the gas in the test treatment chamber is sucked into the low pressure part of the blower through the inner opening and the high pressure of the blower is increased. It is sent to the test processing room through the outer opening and circulates between the test processing room and the air conditioning room. In this case, since the partition member is provided, the gas blown into the test processing chamber is not immediately sucked into the blower. In addition, when gas is blown out from the outer opening in this way, the position of the suction hole for outside air for ventilation is limited, and it becomes difficult to install it, especially in a small thermostatic chamber, but it is difficult to install it. By making the holes intake holes, it becomes easy to take in outside air. Furthermore, since gas is blown into the test processing chamber from the outer periphery with high resistance, and the gas in the chamber is sucked from the center with low resistance, the gas flow is improved and it is not necessary to provide a duct inside the test processing chamber. As a result, the structure is simplified and the volume available for the test processing chamber space is expanded.

According to the invention of claim 4, in addition to the above, since the outer peripheral portion of the partition member has a bent portion that is bent in the gas flowing direction, the blown gas is guided by the bent portion. It is transported to the back of the test processing room. As a result, the gas flow is better. According to the invention of claim 5, since the blade member for flowing the gas from the outside to the inside of the heat insulating wall is provided in the through hole portion of the shaft, the ventilation amount is increased and the ventilation effect and the cooling effect of the motor are improved. To do.

[0010]

【Example】

 FIG. 1 shows a schematic overall structure of a high temperature thermostatic chamber as an example of an environmental test device, and FIG. 2 (a) shows a structure of an air conditioning room portion thereof. The high temperature constant temperature bath is surrounded by a heat insulating wall 1, is partitioned by a partition plate 2 as a partition member, and is provided with a chamber 3 as a test treatment chamber for performing environmental tests and heat treatments, and an air conditioning chamber 4. A motor 5 is mounted on the outer side of the heat insulating wall 1, a shaft 6 of the motor 5 penetrates a through hole 7 formed in the heat insulating wall 1, and a blower 8 is attached to a tip portion thereof.

The blower 8 has a low pressure portion 8a formed near the shaft 6 and a high pressure portion 8b having a pressure higher than that of the low pressure portion at a position distant from the shaft 6. However, since the blower of this embodiment is an axial fan, the pressure inside the tank 3 of the blower is generally low, and the blower 8 sucks gas from the tank 3 and discharges it into the air-conditioning chamber 4.

A centrifugal fan such as a double suction type sirocco fan or a turbo fan may be used instead of the axial fan. As shown in Fig. 2 (b), in the case of a centrifugal fan, the low pressure part is only in the vicinity of the central part on both sides of the blower 8 ', and the air in the tank 3 is sucked from the low pressure part 8'a on one side. become.

The partition plate 2 has an intake port 2 a having a size corresponding to the blower 8 in the present embodiment as an inner opening portion that communicates with at least the low pressure portion, and an outer space between the partition plate 2 and the heat insulation wall 1. It is an outlet 2b as an opening. Further, the partition plate 2 has a bent portion 2c having an outer peripheral portion having a function of guiding a blown air flow, and has a large number of small holes 2d for adjusting a suction air flow.

At the portion of the through hole 7, a cover / motor mounting base 9 is fixed to the outside of the heat insulating wall 1, and an intake hole 10 is opened as an opening that can be electrically connected to the outside. When the length of the shaft 6 becomes long, a cylinder 11 is provided in the through hole 5 so that the outside air suction port is brought close to the low pressure portion 8b of the blower so that the outside air can be easily sucked. A collar 11a as shown by a chain line may be attached to the cylinder 11. An exhaust hole 14 having a ring-shaped heater 12 and a damper 13 is provided at an air outlet portion in the air conditioning chamber 4.

With such a structure, the high temperature constant temperature oven operates as follows. When only air circulation is performed, such as when the temperature rises, the damper 13 of the exhaust hole 14 is closed, the motor 5 is rotated, and the axial fan 8 attached to the shaft 6 thereof is driven. The air is sucked from the inside of the tank 3 and is pressurized by the rotation of the blades to be discharged from the high pressure portion 8b. The air is heated by the heater 12 and blown into the tank 3 from the opening 2b. At this time, the blown air is properly guided by the bent portion 2c on the outer periphery of the partition plate 2, and reaches the vicinity of the facing heat insulating wall in the tank 3 as indicated by an arrow in the figure. Then, in the tank 3, the air flows as a whole uniformly as shown by the arrow and is sucked into the blower 8 again through the many small holes 2d of the partition plate 2 to form an air circulation system. In this case, the low-pressure portion 8a may have a negative pressure slightly lower than the outside on the air-conditioning chamber 4 side, but since the damper 13 is closed, there is almost no pressure difference with the outside air. Even if the intake hole 10 of the cover 9 is opened, the outside air is not sucked unnecessarily.

When the temperature inside the tank approaches the target predetermined temperature, a control system (not shown) is activated, and the internal temperature becomes constant according to the heat load such as heat absorption or heat generation of the test material placed inside. As described above, the temperature inside the tank is controlled. That is, the energization amount to the heater 12 and the opening degree of the damper 13 are controlled in accordance with the detection value of the temperature sensor (not shown), and the damper 13 is controlled so that the energization ratio to the heater 12 becomes a small value. The opening is controlled. When the damper 13 is opened to take in outside air and the air is circulated while ventilating the inside of the tank 3, the internal air flows out from the exhaust hole 14 located on the high pressure side of the blower, so that the test room of the blower 8 is tested. The side becomes negative pressure, and the low pressure portion 8a on the side of the air conditioning chamber 4 also forms a larger negative pressure than when only air circulation is performed. As a result, the outside air required for ventilation is sucked from the intake hole 10 through the through hole 7.

According to such a device, the fact that the vicinity of the central part of the blower becomes a low pressure part is utilized, and the through hole 7 for penetrating the shaft 6 of the blower is used as an air passage for ventilation. Eliminating the need for a separate intake hole for As a result, the number of through holes in the heat insulating wall 1 is reduced, the heat insulating performance of the device is improved, and the structure is simplified. Also, since the outer peripheral side, which has a large frictional resistance to the air flow, is the air blowing side, and the central part, which has a low air resistance, is the suction side, the overall air flow is improved, and it seems that it was provided conventionally. The air duct can be omitted. As a result, the structure is simplified and the volume of the tank 3 is expanded.

FIG. 3 shows the structure of a high temperature constant temperature bath of another embodiment. Compared to the device shown in FIG. 1, the device of this figure has the suction side and the discharge side of the blower 8 that are opposite to each other, that the ducts 15 are provided above and below, and that the heater 12 has an exhaust hole 13 It is different in that it is arranged in the lower part of. In this device, the blower 8 draws in air from the air conditioning room 4 side, blows air into the tank 3 through the partition plate 2, sends it into the duct 15, and blows the heater 12 part in the air conditioning room 4 into the air. It is passed and sucked in again to form an air circulation system. With such a device, the volume of the tank 3 is reduced. However, when the air in the tank 3 is circulated while ventilating, even if the air is exhausted from the exhaust hole 13, the air is exhausted after passing through the tank 3, so the circulating air volume does not decrease. Further, since the air that has passed through the heater 12 is not discharged, there is an advantage that there is no heat loss and efficiency is improved.

FIG. 4 is an explanatory diagram of the cooling effect of the motor bearing portion 5 a by introducing the outside air from the intake hole 10 through the shaft through hole 7. As shown by the arrow in the figure, the heat of the bearing 3 itself and the heat of the inside of the tank 3 that is at high temperature are transferred to the bearing 5a by heat conduction via the shaft 6, so if the bearing is left unattended Although the temperature of 5a rises, the effect of cooling the bearing portion is produced by introducing the outside air from the opening 10, and the rise in temperature can be prevented.

FIG. 5 shows a configuration in which a blower motor protection device is provided in order to effectively utilize the above-described operation. As described above, the damper 13 of the exhaust hole 14 is basically controlled by the damper opening controller 18 based on the temperature inside the tank or the energization ratio to the heater, and the opening is corrected by this protective device. It The opening of the damper 13 can be adjusted by a stepping motor 16, and a thermocouple 17 as a temperature detecting means is attached to the bearing 5a of the motor 5, and the opening of the damper 13 can be adjusted according to the detected temperature. A damper opening controller 18 is used as a control means for controlling. Reference numeral 19 is a limit switch for detecting the opening degree of the damper 13. For example, when the temperature inside the tank 3 is kept high without ventilation, the temperature of the bearing part rises due to heat conduction, but this protective device controls the damper 13 to open when the temperature rises above a certain temperature. By doing so, the abnormal temperature rise can be prevented. As a result, the high temperature state of the tank 3 can be continuously maintained without damaging the motor 5.

FIG. 6 shows an example of a control flow by the protection device. When the timer is reset (S-1), it is determined whether the temperature of the bearing is normal (S-2). If it is not normal, the timer is started to issue a command to correct the damper opening ( S-3, 4), the timer or counter counts the time to determine whether the time has expired (S-5), and if the opening is not corrected and the time is up within the predetermined time, S-2 or less The above processing is repeated, and when the time is up, an output for notifying an abnormality is transmitted (S-6), and the abnormality processing routine (not shown) performs the processing. The damper opening correction command may be calculated to some extent to determine the correction value.

FIG. 7 shows another structural example of the shaft penetrating portion. The shaft 6 of the motor 5 is provided with a screw-shaped multi-blade fan 20 that is an example of a blade member that allows gas to flow from the outside of the heat insulating wall 1 toward the air conditioning chamber 4 in the through hole 7. As a result, when the shaft 6 rotates, the outside air is sucked in through the intake hole 10, so that the ventilation amount can be increased. Further, since the multi-blade fan 20 also functions as a radiation fin, the cooling effect of the shaft 6 can be further increased.

FIG. 8 shows a device that more reliably provides the required ventilation. In this device, a blower 21 is attached to the motor support base 9 together with the motor 5, and this is operated when ventilation is required, and outside air is positively introduced through the intake hole 10 to increase the ventilation volume.

[0024]

[Effect of device]

 As described above, according to the present invention, in the device of claim 1, the through hole of the shaft is used as an intake hole for ventilation to reduce the number of through holes of the heat insulating wall and improve the heat insulating property of the device. The heat loss can be reduced. As a result, energy saving operation of the device can be performed. Further, since the cooling effect is generated by the ventilation in the through hole and the bearing portion of the motor is cooled, the mechanical life of the entire blower including the motor can be extended. Further, since the shaft sealing device is unnecessary, the structure of the through hole portion is simplified.

In addition to the above, in the invention of claim 2, by controlling the damper opening degree of the exhaust hole according to the temperature of the bearing portion of the motor, the intake amount of the through hole is adjusted to adjust the motor shaft bearing. The temperature of the part can be kept below a predetermined temperature, and the durability of the motor can be further improved. In addition, it is possible to continuously maintain a high temperature state in the test processing chamber while maintaining the durability of the motor.

According to the third aspect of the invention, in addition to the effect of the first aspect of the invention, by making the inner opening of the partition member on the suction side and the outer opening on the blowing side, the gas flow is improved, and the test is performed. By omitting the duct in the processing chamber, the structure can be simplified and the capacity in the test processing chamber can be expanded.

In the invention of claim 4, in addition to the above, the bent portion provided on the outer peripheral portion of the partition member guides the blown gas, so that the gas flow can be further improved.

According to the invention of claim 5, in addition to the effect of the invention of claim 1, since the blade member capable of sucking the outside air is provided in the through hole portion of the shaft, the ventilation amount is secured, and the ventilation effect and the mode are improved. It is possible to improve the cooling effect of the heater.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic overall configuration of a high temperature constant temperature bath of an example.

FIG. 2A is a cross-sectional view showing an air-conditioning chamber part of the high temperature constant temperature bath in the case of an axial fan, and FIG. 2B is a cross-sectional view of a fan part in the case of a centrifugal fan.

FIG. 3 is a sectional view showing a schematic overall configuration of a high temperature constant temperature bath of another embodiment.

FIG. 4 is a cross-sectional view showing a through hole portion of the high temperature constant temperature bath of the embodiment, which is an explanatory view of a cooling effect.

FIG. 5 is an explanatory view of a blower motor protection device for a high temperature constant temperature bath according to an embodiment.

FIG. 6 is a flowchart of the operation of the protection device.

FIG. 7 is a cross-sectional view showing the structure when a multi-blade fan is provided on the motor shaft of the high temperature constant temperature bath of the embodiment.

FIG. 8 is a cross-sectional view showing the structure when a blower is provided on the motor mount of the high temperature constant temperature bath of the embodiment.

FIG. 9 is a cross-sectional view showing an example of a schematic overall configuration of a conventional high temperature constant temperature oven.

FIG. 10 is a cross-sectional view showing another example of the schematic overall configuration of a conventional high temperature constant temperature oven.

FIG. 11 is a cross-sectional view showing still another example of the schematic overall configuration of a conventional high temperature constant temperature oven.

FIG. 12 is a cross-sectional view showing a structural example of a through hole portion of a conventional high temperature constant temperature bath.

[Explanation of symbols]

 1 Heat Insulation Wall 2 Partition Plate (Partitioning Member) 2a Suction Hole (Inner Opening) 2b Outlet (Outside Opening) 2c Bent 3 In-Tank (Test Processing Room) 4 Air Conditioning Room 5 Motor 6 Shaft 7 Through Hole 8 Blower 8a Low pressure part 8b High pressure part 10 Intake hole (opening part) 13 Damper 14 Exhaust hole 17 Thermocouple (temperature detection means) 18 Damper opening controller (control means) 20 Multiblade fan (blade member)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Fujioka 3-5-6 Tenjinbashi, Kita-ku, Osaka City, Osaka Tabai Espec Co., Ltd.

Claims (5)

[Scope of utility model registration request] 1. A motor is mounted on the outside of a heat insulating wall, a shaft of the motor penetrates through a through hole formed in the heat insulating wall, and a blower is attached to a tip end portion of the motor so that outside air is exposed through an intake hole and an exhaust hole. In an environmental test device capable of ventilation with internal gas, the blower forms a low pressure portion near the shaft and a high pressure portion having a higher pressure than the low pressure portion at a position distant from the shaft, and the through hole is With an opening capable of conducting with the outside of the heat insulating wall,
An environment test apparatus, wherein the opening is the intake hole. 2. A damper having an adjustable opening degree mounted in the exhaust hole, a temperature detecting means mounted on a bearing portion of the motor, and the damper opening / closing corresponding to a temperature detected by the temperature detecting means. The environmental test apparatus according to claim 1, further comprising: 3. A test processing chamber and an air conditioning chamber which are partitioned by a partition member, wherein the blower is provided in the air conditioning chamber, and the partition member has an inner opening communicating with at least the low pressure portion. The environment testing device according to claim 1, wherein an outer opening is provided between the partition member and the heat insulating wall. 4. The outer peripheral portion of the partition member has a bent portion that is bent in a gas flow direction.
Environmental testing device described in. 5. The environmental test apparatus according to claim 1, wherein the shaft has a blade member that allows gas to flow from the outside to the inside of the heat insulating wall in a portion of the through hole.