CN113532032A

CN113532032A - Dehumidification device for temperature cycle test, temperature cycle test device comprising dehumidification device and dehumidification method

Info

Publication number: CN113532032A
Application number: CN202010289696.XA
Authority: CN
Inventors: 马洋; 向少卿
Original assignee: Hesai Technology Co Ltd
Current assignee: Hesai Technology Co Ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2021-10-22
Anticipated expiration: 2040-04-14
Also published as: CN113532032B

Abstract

The invention provides a dehumidification device for temperature cycle test, which comprises: the carrier is provided with a first cavity and used for loading a component to be dehumidified, and an opening is formed in the outer side of the carrier and communicated with the first cavity; the carrier is coated with the moisture-insulating layer, and the moisture-insulating layer is provided with an opening and a protruding part extending outwards from the opening. By the embodiment of the invention, the phenomenon that water vapor is condensed on the surface of the lens after the temperature cycle test of the lens component is finished is avoided.

Description

Dehumidification device for temperature cycle test, temperature cycle test device comprising dehumidification device and dehumidification method

Technical Field

The invention relates to the technical field of drying and dehumidification, in particular to a dehumidification device for a temperature cycle test, a temperature cycle test device comprising the dehumidification device and a dehumidification method.

Background

As an optical element, a lens assembly is generally composed of a plurality of lenses, and is widely applied to the fields of transportation, machinery, astronomy, military and the like. The size of the object can expand or shrink when the temperature changes, and for the lens assembly, the lens assembly can expand under the environment with temperature changes, and multiple lenses in the lens assembly can further interfere with each other, and the lenses can be cracked when the interference reaches a certain degree. And (3) carrying out high-low temperature alternating temperature cycle test on the lens assembly in a temperature cycle box, and testing whether the lens is broken or not after the temperature cycle is finished. The temperature cycle test is helpful for knowing the working performance of the lens assembly under the condition of temperature change, and then the lens assembly is adjusted to adapt to corresponding environmental change, thereby playing a role in related application fields more safely and stably.

In the temperature cycle process, the environmental humidity is high, and water vapor is easily condensed on the surface of the lens. The principle of water vapor condensation is that when the ambient temperature in the temperature cycle box rises, the temperature of the outer surface of the lens is lower than the ambient temperature due to thermal inertia, and when the damp and hot ambient air meets the surface of the lens which is lower than the dew point, water vapor can be condensed on the surface of the lens to form dew drops. The condensed water vapor can remain water stain on the surface of the lens after being naturally dried, so that the water vapor condensation on the surface of the lens is generally removed by adopting post-process treatment. There are two main approaches, the first is manual treatment, such as manually wiping the lens surface with water vapor. This process has the disadvantage of wiping only the large gap between the lens components of the lens surface with water vapor. The second is by means of a device for processing, for example baking the lens assembly, which has condensed moisture, at a high temperature while extracting the emitted moisture. The disadvantage of this treatment is that the equipment needs to be cooled naturally after baking, and the time for removing water vapor is long.

The statements in the background section are merely prior art as they are known to the inventors and do not, of course, represent prior art in the field.

Disclosure of Invention

The invention provides a dehumidifying device for temperature cycle test, a temperature cycle testing device comprising the dehumidifying device and a dehumidifying method, which relieve the phenomenon that water vapor is condensed on the surface of a lens after the temperature cycle test of a lens assembly is finished, and solve the problems of unclean water vapor removal and long water vapor removal time consumption in the prior art.

To solve the above technical problem, an embodiment of the present invention provides a dehumidification device for temperature cycle test, including:

the carrier is provided with a first cavity and used for loading a component to be dehumidified, and an opening is formed in the outer side of the carrier and communicated with the first cavity;

the carrier is coated with the moisture-insulating layer, and the moisture-insulating layer is provided with an opening and a protruding part extending outwards from the opening.

According to an aspect of the present invention, the carrier further has a second cavity therein, and a drying bag loaded in the second cavity, wherein the second cavity is communicated with the first cavity.

According to one aspect of the present invention, wherein the moisture-barrier layer is filled with nitrogen or an inert gas.

According to one aspect of the invention, the vacuum plastic sealing device is further configured to seal the protruding portion connected to the moisture barrier, draw air inside the moisture barrier and seal the protruding portion on the edge outside the protruding portion.

According to one aspect of the invention, wherein the component to be dehumidified is a lens assembly.

The invention also relates to a dehumidification method for warm cycle testing, which comprises the following steps:

placing an assembly to be dehumidified into a first cavity of a carrier, wherein an opening is formed in the outer side of the carrier and communicated with the first cavity;

wrapping the carrier by a moisture-proof layer, wherein the moisture-proof layer is provided with an opening and a protruding part extending outwards from the opening;

extracting air inside the moisture barrier;

sealing the extended portion of the moisture barrier.

According to an aspect of the invention, further comprising: after the air inside the moisture-proof layer is extracted, nitrogen gas or inert gas is filled into the moisture-proof layer.

According to an aspect of the present invention, wherein the air inside the moisture barrier is extracted and the protruding portion of the moisture barrier is sealed by a vacuum molding device, a sealed seal is provided on an edge outside the protruding portion of the moisture barrier.

The invention also relates to a temperature cycling test device, comprising:

a temperature control box configured to have an internal temperature thereof adjustable;

the dehumidifying device as claimed in any one of the above claims, which can be placed inside the temperature control box.

The above embodiment solves the problem that the surface of the lens assembly condenses water vapor after the temperature cycle test is finished by using the dehumidifying device with the carrier and the moisture-proof layer, and avoids the need of removing the water vapor on the surface of the lens after the test is finished.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic view of a dehumidification apparatus according to one embodiment of the present disclosure;

FIG. 2 shows a schematic view of another dehumidification apparatus in accordance with one embodiment of the present invention;

FIG. 3 shows a schematic view of a lens assembly according to one embodiment of the present invention;

FIG. 4 is a schematic diagram of the dehumidification device shown in FIG. 2 during vacuum plastic packaging;

FIG. 5 shows a schematic view of the dehumidification apparatus of FIG. 2 after vacuum encapsulation;

FIG. 6 shows a flow diagram of a dehumidification method in accordance with one embodiment of the present invention; and

FIG. 7 shows a schematic view of a thermal cycling test device according to one embodiment of the present invention.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

The dehumidifying device for temperature cycle test, the temperature cycle test device comprising the dehumidifying device and the dehumidifying method alleviate the phenomenon that water vapor is condensed on the surface of the lens after the temperature cycle test of the lens assembly is finished, and solve the problems of unclean water vapor removal caused by different sizes of gaps between the lenses and long water vapor removal time caused by using baking equipment.

Fig. 1 shows a schematic view of a dehumidifying apparatus 100 according to one embodiment of the present invention. The dehumidifying apparatus 100 can be used for dehumidifying and drying a component to be dehumidified, and the dehumidifying apparatus 100 will be described in detail with reference to the accompanying drawings. As shown, the dehumidifying apparatus 100 includes a carrier 1 and a moisture barrier 2. The carrier 1 has a first cavity 11 for carrying components 3 to be dehumidified, such as optical lenses or lens sets. The component 3 to be dehumidified may be one piece or a plurality of pieces, and the size of the first cavity 11 may be determined according to the volume and the number of the components 3 to be dehumidified. The outer side of the carrier 1 is provided with an opening 13, the opening 13 is communicated with the first cavity 11, and the size and the number of the opening 13 are determined based on the dehumidification requirement of the component 3 to be dehumidified. The carrier 1 is wrapped by the moisture-proof layer 2, and the moisture-proof layer 2 is provided with an opening 21 and a protruding part 22 extending outwards from the opening 21. The moisture barrier 2 is mainly used to isolate the moisture outside the dehumidifying apparatus 100 from entering the carrier 1 and further entering the component 3 to be dehumidified.

According to a preferred embodiment of the present invention, the moisture barrier layer 2 has a laminated structure, for example, the outer layer material serves to keep the moisture barrier layer structurally intact and isolate the external environment, the interlayer material can improve the strength and moisture resistance and high temperature resistance of the moisture barrier layer, and the inner layer material needs to have good heat sealing performance so as to plastically encapsulate the moisture barrier layer. Specific materials used for each layer are, for example, polyester film (PET) as an outer layer material, Aluminum (AL) as an interlayer material, and Polyethylene (PE) as an inner layer material. The polyester film as the outer layer material has the features of high melting point, high heat resistance, high mechanical strength, high rigidity, high transparency, high fragrance resistance and high gas resistance, and may be isolated from outer environment effectively. When the composite film is compounded with other heat-sealable materials (CPP, PE and the like) to be heat-sealed for bag making, the composite film does not melt and deform and stick to a knife even if the temperature is up to 220 ℃, and is beneficial to bag making of the composite film. The aluminum foil is a metal material, has complete moisture resistance, gas barrier property and light resistance, and is completely moisture impermeable, gas impermeable and light impermeable if mechanical damage and pinholes are not generated. Therefore, the moisture-proof layer 2 made of the aluminum foil as the interlayer material has excellent performances of full sealing, high oil resistance, high temperature resistance and the like. Polyethylene has good heat sealing performance, and can well seal the seal when the package material is finally sealed, so that the polyethylene can be used as an inner layer material of the moisture barrier layer 2. According to a preferred embodiment of the present invention, a barrier layer is further included between the interlayer and the inner layer of the moisture barrier layer 2, and the barrier layer can be made of nylon. Nylon has a high melting point, high heat resistance, high mechanical strength, high transparency and excellent puncture resistance, so that the moisture barrier layer 2 has good puncture resistance. It is understood by those skilled in the art that the scope of the present invention is not limited to the moisture barrier layer 2 having a laminated structure, nor to the specific materials of the respective layers, and those skilled in the art can select the materials and structures of the moisture barrier layer as appropriate according to the specific application and requirements, which are within the scope of the present invention.

Fig. 2 shows a schematic view of another dehumidification apparatus 200 according to one embodiment of the present invention. Compared with the structure of fig. 1, the dehumidifying apparatus 200 shown in fig. 2 has, in addition to the components of the dehumidifying apparatus 100, a second cavity 12 inside the carrier 1 of the dehumidifying apparatus 200, an opening 13 is also provided outside the carrier 1 and around the second cavity 12, and the second cavity 12 communicates with the first cavity 11 through the opening 13. In order to further remove moisture from the assembly 3 and the residual air, the interior of the second cavity 12 is also loaded with a desiccant packet 4, according to a preferred embodiment of the present invention. The drying bag 4 should not only neutralize moisture in the air, but also not decompose and generate volatile substances during the warm-cycle test. Optionally, the drying bag 4 includes chemical drying agents such as calcium oxide and calcium sulfate, or physical drying agents such as silica gel and activated alumina.

According to one embodiment of the invention, wherein said component 3 to be dehumidified is a lens component. Fig. 3 shows a schematic view of a lens assembly 3 according to an embodiment of the invention. As shown, the lens assembly 3 includes a plurality of lens sets with different sizes, namely, a lens 31, a lens 32, and a lens 33 from left to right. The distance between the groups of lenses is set according to the optical requirements. In the present embodiment, the lens 31, the lens 32, and the lens 33 are not equidistant from each other, and the gap between the lens 31 and the lens 32 is small, and the gap between the lens 32 and the lens 33 is large. After the conventional temperature cycle test is completed, the mirror surfaces of the lens 31, the lens 32, and the lens 33 are adhered with the residual moisture of the test. The use of the

dehumidification devices

100 and 200 of the present invention may avoid or mitigate the generation of moisture on the lens surface during testing.

Fig. 4 shows a schematic diagram of the dehumidification device in fig. 2 during vacuum plastic packaging. As shown in the figure, the dehumidifying apparatus 200 further includes a vacuum plastic packaging apparatus 5 capable of plastic packaging the dehumidifying apparatus, where the vacuum plastic packaging apparatus 5 includes an air extractor. Before the temperature cycle test, the vacuum plastic packaging device 5 is adopted to be connected with the extending part 22 of the moisture-proof layer 2 in a sealing mode, the air extractor extracts air inside the moisture-proof layer 2, and the arrow 51 in fig. 4 schematically shows the extraction air flow, so that the purpose of reducing the relative humidity in the moisture-proof layer 2 is achieved. When the vacuum degree in the dehumidifying device meets the requirement, namely the moisture-proof layer 2 is tightly attached to the outer side of the carrier 1, the moisture-proof layer 2 is sealed in a hot plastic package mode, namely the extending part 22 is sealed on the edge of the outer side of the extending part 22 of the moisture-proof layer 2, so that the interaction between the carrier 1 and the external moisture is isolated. And a part of the outermost side of the extension part 22 is an optimal plastic packaging position 23, and the whole moisture insulation layer 2 is subjected to plastic packaging by using a plastic packaging tape at the optimal plastic packaging position 23. When the vacuum plastic sealing device 5 is abnormal, such as incomplete vacuum extraction or poor plastic sealing, the desiccant packet 4 loaded in the second cavity 12 of the carrier 1 can neutralize residual moisture in the surrounding environment, thereby ensuring the dehumidification effect of the dehumidification device 200. The following describes the dehumidification device after vacuum plastic package in detail with reference to the accompanying drawings.

Fig. 5 shows a schematic view of the dehumidifying apparatus of fig. 2 after vacuum molding. As shown in the figure, after the dehumidification device 200 is subjected to vacuum plastic packaging, wherein the gap between the moisture barrier 2 and the carrier 1 is small or even no gap is formed, and the inner layer of the moisture barrier 2 is tightly attached to the outer side of the carrier 1. The opening 21 of the moisture-proof layer 2 is completely closed, the extension part 22 is tightly pressed together in a vacuum environment to form a whole, and the optimal plastic sealing position 23 is provided with a plastic sealing strip, wherein the optimal plastic sealing position 23 is a part of the outermost side of the extension part 22. The moisture barrier 2 completely encloses the carrier 1. After the temperature cycle test is finished, the plastic sealing strip is cut off, and the residual moisture-insulating layer 2 can be recycled, so that the cost of the dehumidifying device is reduced. According to a preferred embodiment of the present invention, the moisture barrier layer 2 is filled with nitrogen or inert gas, so as to further reduce the humidity of the environment surrounding the lens assembly 3 and enhance the dehumidification effect.

FIG. 6 shows a flow diagram of a dehumidification method, according to one embodiment of the present invention. The dehumidification method 600 can be used for dehumidifying and drying the component 3 to be dehumidified, including the lens assembly. The following detailed description, with reference to the drawings, includes the steps of:

in step S601: putting the component to be dehumidified into a first cavity of a carrier, wherein an opening is formed in the outer side of the carrier and communicated with the first cavity. Such as carrier 1 shown in fig. 1 and 2. The component to be dehumidified can be one piece or multiple pieces, and the opening on the outer side of the carrier is set according to the size and the number of the openings. In addition, preferably, the carrier further has a second cavity and a drying bag loaded in the second cavity, wherein the second cavity is communicated with the first cavity through an opening on the outer side of the carrier.

In step S602: and coating the carrier with a moisture-proof layer, wherein the moisture-proof layer is provided with an opening and a protruding part extending outwards from the opening. Wherein the extension part is connected with the vacuum plastic packaging device.

In step S603: extracting air inside the moisture barrier. And vacuumizing the interior of the moisture-proof layer by an air extractor in the vacuum plastic packaging device until the moisture-proof layer is tightly attached to the outer side of the carrier. Optionally, after the air inside the moisture barrier is extracted, nitrogen or inert gas is filled into the moisture barrier.

In step S604: sealing the extended portion of the moisture barrier. After the internal package of the moisture-proof layer meets the requirement of vacuum degree, the extension part of the moisture-proof layer is sealed through a vacuum plastic package device, and the sealed seal is arranged on the edge of the outer side of the extension part of the moisture-proof layer and is the best plastic package position.

FIG. 7 shows a schematic view of a thermal cycling test device according to one embodiment of the present invention. As shown, the temperature cycle testing device 700 includes the dehumidifying apparatus 200 (or the dehumidifying apparatus 100 shown in fig. 1) and a temperature control box 701. Wherein the temperature control box 701 is configured to have an adjustable internal temperature, and the dehumidifying apparatus 200 can be disposed inside the temperature control box 701. And in the temperature circulation process, performing high-low temperature alternating temperature circulation on the temperature circulation box according to the test requirement. After the temperature cycle test is finished, the dehumidifying device 200 is taken out of the temperature control box 701, the plastic seal is removed, whether the component of the component 3 to be dehumidified in the dehumidifying device 200 is intact and the dehumidifying condition of the component are checked, the service conditions of the moisture-proof layer 2 and the drying bag 4 are checked, and the moisture-proof layer 2 or the drying bag 4 is replaced or reused according to the service conditions and requirements.

In summary, the present invention provides a dehumidification device including a carrier and a moisture barrier, so as to alleviate the phenomenon of residual moisture in a component to be dehumidified after a temperature cycle test, and solve the problems of insufficient moisture removal and long time consumption for moisture removal in the prior art.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dehumidification apparatus for warm cycle testing, comprising:

2. The dehumidifying device for warm cycle testing of claim 1, wherein the carrier further has a second cavity therein, and a desiccant bag loaded in the second cavity, wherein the second cavity is in communication with the first cavity.

3. The dehumidification device for warm cycle testing as claimed in claim 1 or 2, wherein the moisture barrier is filled with nitrogen or inert gas.

4. A dehumidifying device for temperature cycle testing according to claim 1 or 2, further comprising a vacuum plastic encapsulation device configured to sealably connect the protrusion of the moisture barrier, draw air inside the moisture barrier and seal the protrusion on an edge outside the protrusion.

5. A dehumidification apparatus for warm cycle testing according to claim 1 or 2 wherein the component to be dehumidified is a lens assembly.

6. A dehumidification method for warm cycle testing, comprising:

extracting air inside the moisture barrier;

sealing the extended portion of the moisture barrier.

7. The dehumidification method for warm cycle testing as claimed in claim 6, wherein the carrier further comprises a second cavity and a drying bag loaded inside the second cavity, wherein the second cavity is in communication with the first cavity.

8. The dehumidification method for warm cycle testing as claimed in claim 6 or 7, further comprising: after the air inside the moisture-proof layer is extracted, nitrogen gas or inert gas is filled into the moisture-proof layer.

9. The dehumidification method for warm cycle testing according to claim 6 or 7, wherein air inside the moisture barrier is extracted and the protruding portion of the moisture barrier is sealed by a vacuum plastic sealing device, and a sealed seal is provided on an edge outside the protruding portion of the moisture barrier.

10. The method of dehumidifying for warm cycle testing of claim 6 or 7, wherein the component to be dehumidified is a lens assembly.

11. A thermal cycling test device, comprising:

the dehumidifying device according to any one of claims 1 to 5, which is placed inside the temperature control box.