CN107917569B - Method for preventing dewing and water drop infiltration on surface of electric connector in refrigeration assembly - Google Patents
Method for preventing dewing and water drop infiltration on surface of electric connector in refrigeration assembly Download PDFInfo
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- CN107917569B CN107917569B CN201711166173.0A CN201711166173A CN107917569B CN 107917569 B CN107917569 B CN 107917569B CN 201711166173 A CN201711166173 A CN 201711166173A CN 107917569 B CN107917569 B CN 107917569B
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- electrical connector
- contact angle
- connector
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- refrigeration assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/04—Preventing the formation of frost or condensate
Abstract
A method for preventing the surface of electric connector from dewing and water drop from infiltrating in the refrigerating module features that the surface of said electric connector is finished, the specific contact angle, shape and space of electric connector are designed to prevent the water and dew from infiltrating in the external water drops, and the water and dew are prevented.
Description
Technical Field
The invention relates to a method for preventing dewing and water drop infiltration on the surface of an electrical connector in a refrigeration assembly, belonging to the field of electrical protection.
Background
In the operation of electronic components, environmental adaptability in a certain range needs to be considered, the electronic components are suitable for different temperature and humidity environments, and different problems need to be prevented according to the difference of temperature and humidity ranges.
Under the conditions of high ambient temperature and humidity or low operating temperature of the electronic element, dew condensation on the surface and the periphery of the electronic element can affect the operation of the device, cause signal distortion, short circuit and other phenomena, and form potential danger for the normal operation of the electronic element.
Disclosure of Invention
The technical problem solved by the invention is as follows: the technical scheme that surface finish treatment and contact angle design are matched with a water seepage prevention sucker type connector is utilized, and the problems of surface dewing and water seepage on the electronic original device under the low-temperature condition are solved.
The technical scheme for solving the technical problems is as follows:
a method for preventing dew condensation and water drop infiltration on the surface of an electrical connector in a refrigeration assembly comprises the following steps:
(1) carrying out polishing treatment on the surface of the socket of the electrical connector;
(2) determining the placement mode of the electrical connector according to the inclination angle of the electrical connector inserting plate and the horizontal direction;
(3) calculating the contact angle between each area of the electrical connector plug board and the jack according to the environment humidity of the electrical connector, selecting a surfactant for treating the surface of each area according to the range of the contact angle, and selecting a coating method according to the narrowest dimension of each area of the electrical connector;
(4) and judging whether to adopt drainage design and increase an anti-seepage sucker according to the placement mode of the electrical connector and the relative environment humidity.
The surface finishing treatment in the step (1) is specifically performed as follows:
(a) cleaning the surface of the electrical connector by using alcohol, and airing the cleaned electrical connector;
(b) placing the dried electrical connector in the step (a) in an aqueous hydrophobing agent for 3-5 minutes;
(c) repeating the steps (a) and (b) two to three times.
In the step (2), if the inclination angle between the electric connector plugboard and the horizontal direction is greater than 10 degrees, the electric connector is horizontally placed; and if the inclination angle of the electric connector plug board and the horizontal direction is not more than 10 degrees, vertically placing the electric connector.
In the step (3), the calculation method of the contact angle between each region of the selected electric connector plug board and the jack is as follows:
(i) when the electrical connector is placed horizontally, the electrical connector contact angle is:
y＝0.0025×x+0.275；
(ii) when the electrical connector is vertically placed, the contact angle of the electrical connector is as follows:
y＝0.003×x+0.17；
wherein Y is the contact angle and X is the ambient relative humidity.
In the step (3), the method for selecting the surfactant is as follows:
(i) when the contact angle Y is not more than 115 degrees, the surfactant is made of organic silicon resin material;
(ii) when the contact angle Y is in the range of (115,125 degrees), the surfactant is an organic fluorine material;
(iii) when the contact angle Y is in the range of (125,135 degrees), the surfactant is selected from an organic silicon material, an organic paraffin material and a polytetrafluoroethylene coating;
(iv) when the contact angle Y is in the range of (135,145 degrees), the surfactant is selected from water-based hydrophobizing agent;
(v) when the contact angle Y is in the range of (145,155 degrees), the surfactant is organic modified acrylic resin;
(vi) when the contact angle Y is larger than 155 degrees, the surfactant is polystyrene mixed solution;
in the step (3), the principle of selecting the coating method according to the narrowest dimension of each region of the electrical connector is as follows:
(i) when the dimension is not more than 0.5cm, the micro-contact printing method is adopted for the electric connector in the area;
(ii) and when the dimension is larger than 0.5cm, the direct physical coating method is adopted for the electric connector in the area.
In the step (4), when the electrical connector is vertically placed, the electrical connector is subjected to water drop directional drainage treatment; when the electrical connector is placed horizontally, the directional drainage treatment is not performed.
In the step (4), when the relative humidity is greater than 65%, the water seepage prevention sucker is sleeved outside the electrical connector, and meanwhile, the water seepage prevention sucker is vacuumized.
Preferably, the temperature range of the working environment of the electrical connector is 0-30 ℃.
Further, the contact angle is measured by a standard CDD camera and a contact angle measuring instrument.
Compared with the prior art, the invention has the advantages that:
(1) the invention adopts the method of changing the surface wettability, effectively improves the difficulty of dewing on the surface of the electronic component, enables the refrigeration component to adapt to the working conditions of higher humidity and lower temperature, is simpler compared with the traditional method of wrapping a plurality of layers of water on the surface, and is beneficial to reducing the redundant substances. Experimental actual measurement shows that the difficulty of surface condensation can be effectively increased by adopting the technology disclosed by the invention.
(2) The invention can make the liquid drops flow away along the directional track after the surface dewing even under the condition of higher humidity or lower temperature through the surface directional drainage design, and the liquid drops can not flow into the socket of the connector. This unique design may allow the electronics to operate at higher humidity.
(3) The invention can effectively prevent the liquid drops formed along the outside of the connector lead from entering the connector under the condition of low temperature or high humidity by sleeving the water seepage-proof sucker outside the connector joint.
(4) When the environment humidity is particularly high or the humidity is general but the temperature is low so that the dew condensation is easy, the invention vacuumizes the inside of the sucker, so that the sucker can be more firmly attached to the surface of a device, and simultaneously, the vacuum degree in the sucker is improved due to the formation of a local vacuum environment, thereby further being beneficial to preventing the dew condensation.
Drawings
FIG. 1 is a flow chart of a method for preventing dew condensation and water droplet infiltration for an electrical connector according to the present invention;
FIG. 2 is a schematic view of an electrical connector placement provided by the present invention;
FIG. 3 is a comparative graph of the dew condensation on the surface of the wafer under a specific environment;
FIG. 4 is a schematic view of an integrated structure of an electrical connector terminal and a water seepage prevention suction cup according to the present invention;
FIG. 5 is a schematic view of the serial placement of different connector chucks provided by the present invention;
Detailed Description
A method for preventing dew condensation and water droplet penetration on the surface of an electrical connector in a refrigeration assembly, as shown in fig. 1, characterized by the steps of:
(1) carrying out polishing treatment on the surface of the socket of the electrical connector;
(2) determining the placement mode of the electrical connector according to the inclination angle of the electrical connector inserting plate and the horizontal direction;
(3) calculating the contact angle between each area of the electrical connector plug board and the jack according to the environment humidity of the electrical connector, selecting a surfactant for treating the surface of each area according to the range of the contact angle, and selecting a coating method according to the narrowest dimension of each area of the electrical connector;
(4) and judging whether to adopt drainage design and increase an anti-seepage sucker according to the placement mode of the electrical connector and the relative environment humidity.
In the step (1), the surface of the socket of the electrical connector is coated with the specific coating, so that the surface tension of water drops attached to the surface is reduced, the attachment difficulty of formed water drops is increased, and the surface condensation humidity is effectively improved. Wherein, the surface finishing treatment specifically comprises the following operations:
(2a) cleaning the surface of the electrical connector by using alcohol, and airing the cleaned electrical connector;
(2b) placing the dried electrical connector in the step (2a) in an aqueous hydrophobing agent for 3-5 minutes;
(2c) repeating the steps (a) and (b) two to three times.
The electrical connector is placed in the manner shown in fig. 2, in the step (2), based on the surface finish treatment, the electrical connector is placed in the manner according to the inclination angle between the electrical connector insert plate and the horizontal direction, wherein if the inclination angle between the electrical connector insert plate and the horizontal direction is greater than 10 degrees, the electrical connector is placed horizontally; and if the inclination angle of the electric connector plug board and the horizontal direction is not more than 10 degrees, vertically placing the electric connector.
In the step (3), according to the electrical connector with the area definition already set, calculating the contact angle of each area on the connector, wherein the contact angle is related to the relative environmental humidity, and the calculation method of the contact angle between each area of the selected electrical connector insertion board and the insertion hole is as follows:
(i) when the electrical connector is placed horizontally, the electrical connector contact angle is:
y＝0.0025×x+0.275；
(ii) when the electrical connector is vertically placed, the contact angle of the electrical connector is as follows:
y＝0.003×x+0.17；
wherein Y is the contact angle and X is the ambient relative humidity.
The set contact angle is measured by a standard CDD camera and contact angle measuring instrument.
Selecting different types of surfactants to coat each region on the basis of the contact angle of each region of the electrical connector, wherein in the step (3), the contact angle range of the surfactant on the surface of the region is selected as follows:
(i) when the contact angle is not more than 115 degrees, the surfactant is made of an organic silicon resin material;
(ii) when the contact angle is 115-125 degrees, the surfactant is an organic fluorine material;
(iii) when the contact angle is 125-135 degrees, the surfactant is an organic silicon material, an organic paraffin material or a polytetrafluoroethylene coating;
(iv) when the contact angle is 135-145 degrees, the surfactant is a water-based hydrophobic agent;
(v) when the contact angle is 145-155 degrees, the surfactant is organic modified acrylic resin;
(vi) when the contact angle is larger than 155 degrees, the surfactant is polystyrene mixed solution;
and simultaneously, selecting a coating method of each region according to the narrowest dimension of the region, wherein in the step (3), the specific determination method of selecting the coating method according to the narrowest dimension of each region of the electrical connector is as follows:
(i) when the dimension is not more than 0.5cm, the micro-contact printing method is adopted for the electric connector in the area;
(ii) and when the dimension is larger than 0.5cm, the direct physical coating method is adopted for the electric connector in the area.
In the step (4), when the electrical connector is vertically placed, the electrical connector is subjected to water drop directional drainage treatment; when the electrical connector is placed horizontally, the directional drainage treatment is not performed. The directional drainage treatment can prevent water drops from vertically flowing downwards under the action of gravity to enter the electrical connector, and can change the flow track of the water drops, so that the water drops can bypass the position of the electrical connector.
In the step (4), when the relative humidity is greater than 65%, the water seepage prevention sucker is sleeved outside the electrical connector, and meanwhile, the water seepage prevention sucker is vacuumized. The inside low pressure or nearly vacuum that is of sucking disc can effectively prevent the dewfall, simultaneously because the sucking disc with the surperficial closely paste with, the gap department at butt joint plug-in components kneck forms local protection for even there is the dewfall water droplet in the sucking disc outside also to be difficult to flow in the connector socket.
Meanwhile, the shape of the selected electrical connector is square or square envelope, the side length is not more than 5cm, and other parts of the connector are determined according to the relative proportion; if the shape of the electrical connector is not square, determining the side length of the square according to the envelope of the longest dimension of the electrical connector, and packaging the electrical connector in the square range.
The method for preventing the dewing and the water drop infiltration on the surface of the electric connector in the refrigeration component mainly comprises four sub-technologies of surface smoothing treatment, specific contact angle setting, water drop directional drainage technology under the action of gravity, water seepage prevention sucker type connectors and the like. The surface modification technology mainly changes the wettability of the surface where the plug interface is located, so that the dewing condition of the area near the joint is more difficult than that of other areas. Herein, the contact angle is designed to prevent the area near the plug from being affected by the water vapor in the air under the working condition range mentioned above, aiming at the requirement of normal operation of the electrical plug under the condition that the air humidity is 60% and the temperature is 0-30 ℃. Meanwhile, by designing the shape and the interval of the gradient contact angle, even if dew drops are formed on the periphery of the connector under higher humidity, the dew drops can not flow to the socket of the connector. By means of the gravity water titration drainage technology, even if the surface is inclined and vertical, liquid drops formed when the humidity is high can flow around the connector under the action of gravity, and cannot flow into the connector. The anti-seepage sucker type connector is suitable for occasions with higher humidity, a closed area is manufactured through air pressure difference, and the vacuum degree in the closed space is improved, so that the electrical connector can meet the requirement of working under high humidity. As shown in fig. 3, the condensation effect of the surface modified and the surface without surface modification is shown to be compared, and it can be seen that the condensation condition of the surface after modification is greatly improved.
As shown in fig. 4, the structure of the connector and the anti-seepage sucker is shown, wherein the working principle of the vacuum sucker hook is utilized, the wall fixing surface can be sucked because the air inside the sucker is exhausted when the sucker is squeezed, so that the air pressure inside the sucker is far less than the outside air pressure, and the sucker is pressed on the wall by the extremely high pressure on the outer surface of the sucker. If the surface of the wall is not smooth enough (dust, oil stain, dirt and the like), the outside air is pressed into the suction cup through the small gap at the joint of the suction cup and the wall, the internal air pressure is increased, and the external atmospheric pressure is not changed. Thus, the difference between the internal air pressure and the external air pressure takes effect, the pressure on the outer surface of the sucker is reduced, the sucker naturally and easily falls off, and therefore, the sucker hook needs to be sucked on a smooth plane to be firmly sucked. When the sucker is stuck, the surface to be stuck is wiped or cleaned in advance for firmer sticking, and then the sucker is dried for later use. The coating after surface modification is required to be as uniform as possible, and meanwhile, a trace amount of waterproof glue is coated on the inner surface of the sucker. When the sucker is stuck, the sucker is pressed from the middle to the periphery, so that air in the sucker can be better expelled, and the sucker is stuck more firmly. As shown in fig. 5, if necessary, a machine vacuum may be used, and the same vacuum apparatus may be used to evacuate multiple suction cups.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. A method for preventing dew condensation and water drop infiltration on the surface of an electrical connector in a refrigeration assembly is characterized by comprising the following steps:
(1) carrying out polishing treatment on the surface of the socket of the electrical connector;
(2) determining the placement mode of the electrical connector according to the inclination angle of the electrical connector inserting plate and the horizontal direction;
(3) calculating the contact angle between each area of the electrical connector plug board and the jack according to the environment humidity of the electrical connector, selecting a surfactant for treating the surface of each area according to the contact angle range, and selecting a coating method according to the narrowest dimension of each area of the electrical connector;
(4) and judging whether to adopt drainage design and increase an anti-seepage sucker according to the placement mode of the electrical connector and the relative environment humidity.
2. The method of preventing condensation and water droplet penetration on the surface of an electrical connector in a refrigeration assembly of claim 1, wherein: the surface finishing treatment in the step (1) is specifically performed as follows:
(2a) cleaning the surface of the electrical connector by using alcohol, and airing the cleaned electrical connector;
(2b) placing the dried electrical connector in the step (2a) in an aqueous hydrophobing agent for 3-5 minutes;
(2c) repeating the steps (2a) and (2b) two to three times.
3. The method of preventing condensation and water droplet penetration on the surface of an electrical connector in a refrigeration assembly of claim 1, wherein: in the step (2), if the inclination angle between the electric connector plugboard and the horizontal direction is greater than 10 degrees, the electric connector is horizontally placed; and if the inclination angle of the electric connector plug board and the horizontal direction is not more than 10 degrees, vertically placing the electric connector.
4. The method of preventing condensation and water droplet penetration on the surface of an electrical connector in a refrigeration assembly of claim 3, wherein: in the step (3), the calculation method of the contact angle between each region of the selected electric connector plug board and the jack is as follows:
(i) when the electrical connector is placed horizontally, the electrical connector contact angle is:
Y＝0.0025×X +0.275；
(ii) when the electrical connector is vertically placed, the contact angle of the electrical connector is as follows:
Y＝0.003×X +0.17；
wherein Y is the contact angle and X is the ambient relative humidity.
5. The method of preventing condensation and water droplet penetration on the surface of an electrical connector in a refrigeration assembly of claim 4, wherein: in the step (3), the method for selecting the surfactant is as follows:
(i) when the contact angle Y is not more than 115 degrees, the surfactant is made of organic silicon resin material;
(ii) when the contact angle Y is in the range of (115,125 degrees), the surfactant is an organic fluorine material;
(iii) when the contact angle Y is in the range of (125,135 degrees), the surfactant is selected from an organic silicon material, an organic paraffin material and a polytetrafluoroethylene coating;
(iv) when the contact angle Y is in the range of (135,145 degrees), the surfactant is selected from water-based hydrophobizing agent;
(v) when the contact angle Y is in the range of (145,155 degrees), the surfactant is organic modified acrylic resin;
(vi) when the contact angle Y is larger than 155 degrees, the surfactant is polystyrene mixed solution.
6. The method of preventing condensation and water droplet penetration on the surface of an electrical connector in a refrigeration assembly of claim 5, wherein: in the step (3), the principle of selecting the coating method according to the narrowest dimension of each region of the electrical connector is as follows:
(i) when the dimension is not more than 0.5cm, the micro-contact printing method is adopted for the electric connector in the area;
(ii) and when the dimension is larger than 0.5cm, the direct physical coating method is adopted for the electric connector in the area.
7. The method of preventing condensation and water droplet penetration on the surface of an electrical connector in a refrigeration assembly of claim 3, wherein: in the step (4), when the electrical connector is vertically placed, the electrical connector is subjected to water drop directional drainage treatment; when the electrical connector is placed horizontally, the directional drainage treatment is not performed.
8. The method of preventing condensation and water droplet penetration on the surface of an electrical connector in a refrigeration assembly of claim 1, wherein: in the step (4), when the relative humidity is greater than 65%, the water seepage prevention sucker is sleeved outside the electrical connector, and meanwhile, the water seepage prevention sucker is vacuumized.
9. The method of preventing condensation and water droplet penetration on the surface of an electrical connector in a refrigeration assembly of claim 1, wherein: the temperature range of the working environment of the electrical connector is 0-30 ℃.
10. The method of preventing condensation and water droplet penetration on the surface of an electrical connector in a refrigeration assembly of claim 1, wherein: the contact angle is measured by a standard CDD camera and contact angle measuring instrument.
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| CN201711166173.0A CN107917569B (en) | 2017-11-21 | 2017-11-21 | Method for preventing dewing and water drop infiltration on surface of electric connector in refrigeration assembly |
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| CN201711166173.0A CN107917569B (en) | 2017-11-21 | 2017-11-21 | Method for preventing dewing and water drop infiltration on surface of electric connector in refrigeration assembly |
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| CN107917569B true CN107917569B (en) | 2020-06-09 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200979036Y (en) * | 2005-12-19 | 2007-11-21 | 林麟 | Compound tube without dewing |
| JP2009228999A (en) * | 2008-03-24 | 2009-10-08 | Mitsubishi Electric Corp | Refrigerating cycle device, refrigerating-air conditioning device, and hot water supply device |
| CN103502417A (en) * | 2011-04-25 | 2014-01-08 | 荷兰联合利华有限公司 | Hard surface treatment composition |
| CN103982017A (en) * | 2014-01-07 | 2014-08-13 | 宋波 | Anti-condensation metal radiant panel and manufacturing method thereof |
| CN105636253A (en) * | 2014-10-29 | 2016-06-01 | 青岛海尔空调器有限总公司 | Anti-condensation corrosion-resistant PTC electric heater and manufacturing method thereof |
-
2017
- 2017-11-21 CN CN201711166173.0A patent/CN107917569B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200979036Y (en) * | 2005-12-19 | 2007-11-21 | 林麟 | Compound tube without dewing |
| JP2009228999A (en) * | 2008-03-24 | 2009-10-08 | Mitsubishi Electric Corp | Refrigerating cycle device, refrigerating-air conditioning device, and hot water supply device |
| CN103502417A (en) * | 2011-04-25 | 2014-01-08 | 荷兰联合利华有限公司 | Hard surface treatment composition |
| CN103982017A (en) * | 2014-01-07 | 2014-08-13 | 宋波 | Anti-condensation metal radiant panel and manufacturing method thereof |
| CN105636253A (en) * | 2014-10-29 | 2016-06-01 | 青岛海尔空调器有限总公司 | Anti-condensation corrosion-resistant PTC electric heater and manufacturing method thereof |
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