CN104117394B - A kind of by the humiture test box of liquid heating and constant temperature - Google Patents
A kind of by the humiture test box of liquid heating and constant temperature Download PDFInfo
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- CN104117394B CN104117394B CN201410380254.0A CN201410380254A CN104117394B CN 104117394 B CN104117394 B CN 104117394B CN 201410380254 A CN201410380254 A CN 201410380254A CN 104117394 B CN104117394 B CN 104117394B
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Abstract
A kind of by the humiture test box of liquid heating and constant temperature, it is structurally characterized in that, it includes being positioned at the liquid constant temperature of test box body and processes device and air channel, vertically arranged liquid constant temperature processes to be separated by metallic plate between device and air channel, the top and bottom in described air channel respectively air channel wind outlet section and air channel wind feeding section, being provided with the humidifier for regulating gas temperature and humidity and dehumidifier in the wind feeding section of described air channel, just the test box body inwall to air channel wind outlet section and air channel wind feeding section is convex structure.The present invention is in-70 DEG C～180 DEG C temperature ranges, and the stability of temperature and uniformity be able to reach ± level of 0.05 DEG C and 0.1 DEG C；In the humidity range of 30%RH～98%RH, the stability of humidity and uniformity be able to reach ± level of 0.5%RH and 1%RH；The temperature of the present invention, the stability of humidity and uniformity are all improved, and are also beneficial to the quality improving humiture environmental test.
Description
Technical field
The present invention relates to a kind of environmental test equipment, particularly relate to a kind of humiture test box by liquid heating and constant temperature.
Background technology
Any product all can stand the electric and electronic product that different environmental conditions, particularly application are increasingly extensive, and experienced environmental condition becomes increasingly complex various.Thus, electric and electronic product is carried out manual simulation environmental test and is to ensure that the requisite important step of its high-quality.Manual simulation environmental test is the scientific epitomization of actual environment impact, has typification, standardization, easy to use and be easy to features such as comparing.The variation of environmental condition and the importance of environmental test, also propose tightened up requirement to environmental test equipment.
Humidity Test is most important test in environmental test.Being analyzed showing to the fault that air environment is annual, the fault of more than 50% is caused by various environmental factorss, and humiture environmental factors causes the fault rate of electronic equipment about 32.2%, it is seen that Humidity Test importance in environmental test.
Therefore, make great efforts to improve the technical performance of humiture test box (equipment), the environmental test quality improving product is had important effect.
Current humiture test box, in-70 DEG C～180 DEG C temperature ranges, the stability of temperature and uniformity, generally can only achieve ± 0.5 DEG C and 4 DEG C respectively, small part (is usually at 0 DEG C～100 DEG C) in narrower temperature range, can reach ± 0.2 DEG C and 2 DEG C respectively.In the humidity range of 30%RH～98%RH, (at this moment gas temperature is at 20 DEG C～90 DEG C), the stability of humidity and uniformity, generally can only achieve ± 1%RH and 6%RH respectively.
The temperature stability of liquid thermostatic bath best at present and uniformity, respectively reached ± 0.0008 DEG C and 0.002 DEG C.Simple liquid thermostatic bath that commonly use, very common, in-70 DEG C～180 DEG C temperature ranges, the stability of temperature and uniformity, it is possible to be easily reached ± the level of 0.02 DEG C and 0.05 DEG C.
The humiture test box being medium with air, the stability of temperature and uniformity, and with liquid for compared with the temperature chamber of medium, differing more than several order of magnitude.Trace it to its cause, mainly by the character of air and what mode of heating caused.
Poor thermal conductivity and thermal capacity little be the inherent character of air, in contrast, heat conductivity is good and thermal capacity is greatly the inherent character of liquid.
This is that the design structure of current humiture test box adopts structure as shown in Figure 3 without exception, and it includes casing 1, heat-insulation layer 2, wind direction adjusting plate 3, the drive motor 4 of blower fan, blower fan 5, air-duct clapboard 6, heating element heater 7, regulates air channel 8, refrigerator 9 (condenser) and humidifier 10.It arranges adjustment air channel 8 at the rear portion of work space, regulates in air channel 8 and is provided with humidifier 10, refrigerator 9 (condenser) and heater 7.In adjustment air channel 8, humidified device 10 humidifies air, refrigerator 9 cools down, heating element heats, regulates top, air channel 8 and installs blower fan 5 forced-air circulation to work space, and air is then through being back in air channel 8 bottom work space and formed circulating.
The major defect of above-mentioned design structure can be summarized as:
(1) heating surface (area) (HS of heating element heater is less, air is insufficient with the heat exchange of heating surface, the air of flowing in air channel, has considerable part directly not contact with the heating surface of heating element heater, this has resulted in partial air and has been themselves directly heated, and has partial air not to be themselves directly heated；Similar with it, the refrigeration area of refrigerator is also less, can cause identical problem；
(2) control to heating element heater, be a kind of discontinuous energising control, namely heating element heater is not the thermal source of a temperature stabilization, be heated when this has resulted in air, time without be heated；
(3) blower fan that forced-air circulation uses, fan blade is not covered with whole air channel, and this has resulted in air and has flowed uneven in air channel, flows also uneven in work space；
(4) instability of temperature and uneven, causes the instability of humidity and uneven；
(5) work space is square structure, is unfavorable for the Uniform Flow of air.
Due to the inherent character that air conduction is poor, thermal capacity is little, which results in the stability of humiture test box temperature and uniformity can not reach higher level.Meanwhile, being subject to the impact that temperature is unstable and uneven, the stability of humidity and uniformity can not reach higher level.
Humidity relative humidity in environmental test represents, the definition of relative humidity is corresponding with the temperature conditions of humid air, and when in air, contained aqueous vapor is identical, air themperature is different, then the relative humidity of air is different.Research shows, the aerial distribution of aqueous vapor is uniform, and relative humidity unstability and inhomogeneities are mainly due to the instability of temperature and uneven cause.Improve stability and the uniformity of air humidity, substantially mainly improve stability and the uniformity of air themperature.Therefore, stability and the uniformity of humiture test box humidity are improved, it is necessary to set about from raising air themperature stability and uniformity.
Contrary with the character of air, heat conductivity is good and thermal capacity is greatly the inherent character of liquid.Use heating element heater, refrigerator directly to liquid heating and cooling, make liquid flow in test chamber by stirring, the stability of the temperature of the liquid thermostatic bath so obtained and uniformity, the several order of magnitude of humiture test box can be exceeded.
Summary of the invention
It is an object of the invention to provide a kind of humiture test box by liquid heating and constant temperature, stability and the uniformity of its temperature and humidity are all significantly improved, and also improve the quality of humiture environmental test.
The present invention is achieved like this, and adopts heating element heater, refrigerator directly to air heating and cooling for current humiture test box, it is impossible to obtaining good stability and homogeneity question, the present invention adopts the technical scheme that:
(1) use the liquid of temperature stabilization in liquid thermostatic bath air to be heated and constant temperature, solve the heat source that heating element heater is not a temperature stabilization；
(2) one piece of large-area metallic plate is used to serve as heat exchanger plate, one face of metallic plate is heated and constant temperature by the liquid in liquid thermostatic bath, another is heated and constant temperature in the face of air, and the heating surface (area) (HS solving heating element heater is less, the insufficient problem of heat exchange of air and heating surface；
(3) using crossflow fan forced-air circulation, the fan blade of crossflow fan covers whole air channel, so promotes air Uniform Flow in air channel；
(4) wall on air channel air outlet slit opposite, is designed to arc surface, is so effectively improved air in work space Uniform Flow problem；
(5) adopt dehumidifier and humidifier to air dewetting or humidification.
The concrete structure of the present invention is, it includes test box body and the heat-preservation cotton layer being filled in inner walls, it is structurally characterized in that, it also includes being positioned at the liquid constant temperature of test box body and processes device and air channel, vertically arranged liquid constant temperature processes to be separated by metallic plate between device and air channel, the top and bottom in described air channel respectively air channel wind outlet section and air channel wind feeding section, it is provided with the humidifier for regulating gas temperature and humidity and dehumidifier in the wind feeding section of described air channel, just the test box body inwall to air channel wind outlet section and air channel wind feeding section is convex structure, this promotes air to be back to air channel equably, so also the uniformity for improving workspace temperature creates condition.Described metallic plate top and test box body inwall junction are provided with fluid sealant.
Described air channel is the slype being made up of metallic plate and air-duct clapboard, the wind outlet section end, air channel in described air channel is provided with several wind direction adjusting plates in sector arrangement, it is additionally provided with crossflow fan, described crossflow fan and the second drive motor in the wind outlet section of air channel to be in transmission connection.Described crossflow fan is the tubular structure running through whole air channel wind outlet section along its length, as shown in Figure 2.
Described liquid constant temperature processes device and includes liquid thermostatic bath and be positioned at the liquid thermostatic bath agitator of liquid thermostatic bath, and described liquid thermostatic bath agitator is in transmission connection with the first drive motor being positioned at outside test box body；Described liquid thermostatic bath inner sidewall upper portion is provided with spout hole.Described liquid thermostatic bath and test box body have a medial wall, and this medial wall is provided with fluid sealant.
The invention have the benefit that the deficiency that the present invention be directed to existing humiture test box carries out innovative design, air is heated and the method for constant temperature owing to have employed liquid in liquid thermostatic bath, the stability of obtained standard atmosphere proof box temperature and uniformity, essentially identical with the stability of liquid thermostatic bath and uniformity；It is in the temperature range of humiture test box-70 DEG C～180 DEG C, and the stability of temperature and uniformity be able to reach ± level of 0.05 DEG C and 0.1 DEG C；In the humidity range of 30%RH～98%RH, the stability of humidity and uniformity be able to reach ± level of 0.5%RH and 1%RH；Humiture test box temperature, the stability of humidity and uniformity are brought up to a new height, thus improving the quality of humiture environmental test.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the attachment structure schematic diagram of crossflow fan of the present invention and the second drive motor.
Fig. 3 is the structural representation of tradition humiture test box.
In the drawings, 1, casing 2, heat-insulation layer 3, wind direction adjusting plate 4, the drive motor 5 of blower fan, blower fan 6, air-duct clapboard 7, heating element heater 8, regulate air channel 9, refrigerator 10, humidifier.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
As it is shown in figure 1, a lateral layout of liquid thermostatic bath 114 is become not have the metallic plate 106 of heat-insulation layer 102, block of metal plate 106 serves as the whole side inside the air channel 112 of standard atmosphere proof box.One face of metallic plate 106 is heated and constant temperature by the liquid of liquid thermostatic bath 114, utilizes the heat conductivility that metal is good, and air just can be heated and constant temperature by another face, thus achieves liquid to the heating of air and constant temperature.Due to the inherent character that liquid thermal conductivity is good, thermal capacity is big etc., temperature of liquid stability and uniformity in liquid thermostatic bath 114 are very good, the temperature stability of block of metal plate 106 and uniformity, essentially identical with temperature of liquid stability and uniformity, metallic plate 106 has just become temperature stabilization uniform thermostat metal plate again.Which solves the thermal source that current humiture test box use heating element heater is not temperature stabilization, the problem that heating surface (area) (HS is little again.
Dehumidifier 116 and humidifier 115 are designed the bottom at work space, the air channel 112 of thermostat metal plate 106 side adopts and narrows design, the benefit narrowed is to make air more can contact with thermostat metal plate 106 fully, in order to carry out sufficient heat exchange with thermostat metal plate 106.
Adopt the design of crossflow fan 105 forced-air circulation, the fan blade of crossflow fan 105 covers whole air channel 112, so the benefit of design is to make air flow evenly through whole air channel 112, namely in the position that air channel 112 is different, enable air to simultaneously enter air channel 112, leave air channel 112 simultaneously, due to air in air channel 112 identical with the heat exchanger time of thermostat metal plate 106, after air leaves air channel 112, the air themperature that air channel 112 exports diverse location is identical, and this is that the uniformity improving workspace temperature creates condition.
The concrete structure of the present invention is, it includes test box body 101 and the heat-preservation cotton layer 102 being connected in inner walls, it is structurally characterized in that, it also includes being positioned at the liquid constant temperature of test box body 101 and processes device and air channel 112, vertically arranged liquid constant temperature processes to be separated by metallic plate 106 between device and air channel 112, the top and bottom in described air channel 112 respectively air channel wind outlet section 109 and air channel wind feeding section 117, the humidifier 115 for regulating gas temperature and humidity and dehumidifier 116 it is provided with in described air channel wind feeding section 117, just test box body 101 inwall to air channel wind outlet section 109 and air channel wind feeding section 117 is convex structure, this promotes air to be back to air channel equably, so also the uniformity for improving workspace temperature creates condition.Described metallic plate 106 top and test box body 101 inwall junction are provided with fluid sealant 107.
Described air channel 112 is the slype being made up of metallic plate 106 and air-duct clapboard 103, air channel wind outlet section 109 end in described air channel 112 is provided with several wind direction adjusting plates 104 in sector arrangement, being additionally provided with crossflow fan 105 in air channel wind outlet section 109, described crossflow fan 105 and the second drive motor 118 are in transmission connection.Described crossflow fan 105 is the tubular structure running through whole air channel wind outlet section 109 along its length, as shown in Figure 2.
Described liquid constant temperature processes device and includes liquid thermostatic bath 114 and be positioned at the liquid thermostatic bath agitator 113 of liquid thermostatic bath 114, and described liquid thermostatic bath agitator 113 is in transmission connection with the first drive motor 108 being positioned at outside test box body 101；Described liquid thermostatic bath 114 inner sidewall upper portion is provided with spout hole 111.Described liquid thermostatic bath 114 has a medial wall with test box body 101, and this medial wall is provided with fluid sealant 110.
By the structural design of details described above, thus it is highly stable and uniform by the standard atmosphere proof box of liquid heating and constant temperature to obtain a kind of temperature and humidity.
The operation principle of the present invention is, crossflow fan 105 drives air to flow, and regulates air flow work space diverse location through wind direction adjusting plate 104, and air is back to air channel wind feeding section 117 from top to bottom, enters air channel 112 and forms circulation.
When air enters air channel wind feeding section 117, dehumidified device 116 dehumidifies, or humidified device 115 humidifies.Metallic plate 106 is heated and constant temperature by the liquid in liquid thermostatic bath 114, and due to the thermal conductive resin of metal, air is heated and constant temperature by metallic plate 106 when flowing in air channel 112.
Compared with the conventional device configuration of schematic diagram 3, the method for the invention is summarized as follows:
(1) traditional method uses heating element heater and refrigerator directly to air heating and cooling, this method uses temperature stabilization and uniform liquid in liquid thermostatic bath air to be heated and constant temperature, the air themperature being achieved in that is essentially identical with temperature of liquid, and stability is also essentially identical；The raising of temperature stability, makes the stability of humidity be improved simultaneously；
(2) by metallic plate one piece big, it is achieved the heat exchange of liquid-to-air；
(3) current method uses general blower fan, and fan blade is not covered with whole air channel, and this method uses crossflow fan, and fan blade covers whole air channel, makes air more uniformly flow in air channel；
(4) this method adopts the design that air channel is narrowed, and about only has the 1/10 of current air channel, enables air to carry out more fully with thermostat metal plate heat exchange；
(5) this method adopts the side arc-shaped design on opposite, air channel, enables air to more uniformly be back in air channel；
(6) dehumidifier and humidifier design bottom work space.
Claims (7)
- null1. one kind by liquid heating and the humiture test box of constant temperature，It includes test box body (101) and the heat-preservation cotton layer (102) being filled in inner walls，It is characterized in that，It also includes being positioned at the liquid constant temperature of test box body (101) and processes device and air channel (112)，Vertically arranged liquid constant temperature processes to be separated by metallic plate (106) between device and air channel (112)，The top and bottom in described air channel (112) respectively air channel wind outlet section (109) and air channel wind feeding section (117)，The humidifier (115) for regulating gas temperature and humidity and dehumidifier (116) it is provided with in described air channel wind feeding section (117)，Just test box body (101) inwall to air channel wind outlet section (109) and air channel wind feeding section (117) is convex structure；Being additionally provided with crossflow fan (105) in described air channel wind outlet section (109), described crossflow fan (105) and the second drive motor (118) are in transmission connection.
- 2. as claimed in claim 1 by the humiture test box of liquid heating and constant temperature, it is characterized in that, described air channel (112) is the slype being made up of metallic plate (106) and air-duct clapboard (103), and air channel wind outlet section (109) end of described air channel (112) is provided with several wind direction adjusting plates (104) in sector arrangement.
- 3. as claimed in claim 2 by the humiture test box of liquid heating and constant temperature, it is characterised in that described crossflow fan (105) is the tubular structure running through whole air channel wind outlet section (109) along its length.
- 4. as claimed in claim 1 by the humiture test box of liquid heating and constant temperature, it is characterized in that, described liquid constant temperature processes device and includes liquid thermostatic bath (114) and be positioned at the liquid thermostatic bath agitator (113) of liquid thermostatic bath (114), and described liquid thermostatic bath agitator (113) is in transmission connection with being positioned at test box body (101) the first drive motor (108) outward.
- 5. as claimed in claim 4 by the humiture test box of liquid heating and constant temperature, it is characterised in that described liquid thermostatic bath (114) inner sidewall upper portion is provided with spout hole (111).
- 6. as described in claim 4 or 5 by liquid heating and the humiture test box of constant temperature, it is characterized in that, described liquid thermostatic bath (114) and test box body (101) have a medial wall, and this medial wall is provided with fluid sealant (110).
- 7. as claimed in claim 1 by the humiture test box of liquid heating and constant temperature, it is characterised in that described metallic plate (106) top and test box body (101) inwall junction are provided with fluid sealant (107).
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| CN201410380254.0A CN104117394B (en) | 2014-08-04 | 2014-08-04 | A kind of by the humiture test box of liquid heating and constant temperature |
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| CN201410380254.0A CN104117394B (en) | 2014-08-04 | 2014-08-04 | A kind of by the humiture test box of liquid heating and constant temperature |
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| CN104117394B true CN104117394B (en) | 2016-07-06 |
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| CN108519193A (en) * | 2018-06-08 | 2018-09-11 | 北京市计量检测科学研究院 | A kind of pressure measurement utensil calibrating environment test device |
| CN115212929A (en) * | 2022-06-28 | 2022-10-21 | 太原煤科检测技术有限公司 | Environmental test chamber |
| CN114994078B (en) * | 2022-08-01 | 2022-10-25 | 深圳市南德谱光电有限公司 | Polaroid assembly line production bubble detection device |
| CN115382584A (en) * | 2022-09-02 | 2022-11-25 | 江苏拓米洛环境试验设备有限公司 | Damp-heat test box |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06141752A (en) * | 1992-10-30 | 1994-05-24 | Sanyo Electric Co Ltd | Thermo-hygrostat |
| CN201579061U (en) * | 2010-01-07 | 2010-09-15 | 东莞市立佳精密仪器有限公司 | Constant temperature and humidity box |
| CN102974406A (en) * | 2012-11-14 | 2013-03-20 | 天津天维移动通讯终端检测有限公司 | Constant temperature humidity chamber |
| CN203170340U (en) * | 2013-03-12 | 2013-09-04 | 东莞市升微机电设备科技有限公司 | Constant temperature and humidity test chamber |
| CN203170337U (en) * | 2013-03-12 | 2013-09-04 | 东莞市升微机电设备科技有限公司 | Constant temperature and humidity test chamber air duct structure |
| CN103447100B (en) * | 2013-09-09 | 2015-03-18 | 南京林业大学 | Constant-temperature and constant-humidity box |
| CN204122131U (en) * | 2014-08-04 | 2015-01-28 | 广州赛宝计量检测中心服务有限公司 | A kind of humiture test box by heating liquid and constant temperature |
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