CN107917569B - Method for preventing dewing and water drop infiltration on surface of electric connector in refrigeration assembly - Google Patents

Abstract

A method for preventing condensation on the surface of electrical connectors and infiltration of water droplets in refrigeration components, which is used to prevent the infiltration of external water droplets and condensation on the outer surface of general circulating low-temperature water cooling units. The contact angle, specific contact angle shape design and spacing design realize the waterproof and anti-condensation function of the electrical connector, and at the same time overcome the problem that the existing connector has a small humidity adaptation range and is easy to cause short circuit due to external water seepage. Improve the service life and high reliability.

Description

A method for preventing condensation on the surface of electrical connectors and infiltration of water droplets in a refrigeration assembly

technical field

The invention relates to a method for preventing dew condensation on the surface of an electrical connector and infiltration of water droplets in a refrigeration assembly, and belongs to the field of electrical protection.

Background technique

During the operation of electronic components, it is necessary to consider a certain range of environmental adaptability to adapt to different temperature and humidity environments. According to the difference in temperature and humidity ranges, there will be different problems that need to be prevented.

When the ambient temperature and humidity are high, or the operating temperature of the electronic components itself is low, condensation on the surface of the electronic components and its surroundings will affect the operation of the device, causing signal distortion, short circuit and other phenomena, which will affect the normal operation of the electronic components. form a potential hazard.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is: in view of the deficiencies of the prior art, a technology for preventing surface condensation and water droplet infiltration of electronic components is proposed, and the technology of using surface smoothing treatment, contact angle design to cooperate with anti-seepage suction cup type connectors Solution to solve the problems of surface condensation and water penetration under the condition of low temperature of electronic components.

The present invention solves the above-mentioned technical problems through the following technical solutions:

A method for preventing condensation on the surface of electrical connectors and infiltration of water droplets in a refrigeration assembly, the steps are as follows:

(1) Smooth and clean the surface where the electrical connector socket is located;

(2) Determine the placement method of the electrical connector according to the inclination angle between the electrical connector board and the horizontal direction;

(3) Calculate the contact angle between each area of the electrical connector board and the jack according to the environmental humidity where the electrical connector is located, select the surfactant to treat the surface of the area according to the range of the contact angle, and select according to the size of the narrowest part of each area of the electrical connector coating method;

(4) Judge whether to adopt the drainage design and whether to add the anti-seepage suction cup according to the placement method of the electrical connector and the relative humidity of the environment.

The specific operations of performing surface smoothing treatment in the step (1) are as follows:

(a) Use alcohol to clean the surface of the electrical connector, and dry the cleaned electrical connector;

(b) placing the dried electrical connector in step (a) in an aqueous hydrophobic agent for 3-5 minutes;

(c) Repeat steps (a) and (b) two to three times.

In the step (2), if the inclination angle between the electrical connector plug-in board and the horizontal direction is greater than 10 degrees, the electrical connectors are placed horizontally; The connectors are placed vertically.

In the step (3), the calculation method of the contact angle angle between each area of the selected electrical connector board and the jack is:

(i) When the electrical connector is placed horizontally, the contact angle of the electrical connector is:

y=0.0025×x+0.275;

(ii) When the electrical connector is placed vertically, the contact angle of the electrical connector is:

y=0.003×x+0.17;

where Y is the contact angle and X is the relative humidity of the environment.

In described step (3), the method for selecting surfactant is as follows:

(i) When the contact angle Y is not greater than 115 degrees, the surfactant is selected from silicone resin materials;

(ii) when the contact angle Y is in the range of (115,125] degrees, the surfactant is selected from organic fluorine materials;

(iii) When the contact angle Y is in the range of (125,135] degrees, the surfactant is selected from silicone materials, organic paraffin materials, and polytetrafluoroethylene coatings;

(iv) when the contact angle angle Y is in the range of (135,145] degrees, the surfactant is selected as a water-based hydrophobic agent;

(v) when the contact angle angle Y is in the range of (145,155] degrees, the surfactant is selected from organically modified acrylic resin;

(vi) When the contact angle angle Y is greater than 155 degrees, the surfactant is selected from polystyrene mixed solution;

In the step (3), the principle of selecting the coating method according to the size of the narrowest part of each area of the electrical connector is as follows:

(i) When the size is not greater than 0.5cm, the micro-contact printing method is used for the electrical connectors in this area;

(ii) When the size is greater than 0.5cm, the direct physical coating method is used for the electrical connectors in this area.

In the step (4), when the electrical connector is placed vertically, the water droplet directional drainage process is performed on the electrical connector; when the electrical connector is placed horizontally, the directional drainage process is not performed.

In the step (4), when the relative humidity is greater than 65%, a water-proof suction cup is applied to the outer casing of the electrical connector, and a vacuum treatment is performed on the water-proof suction cup at the same time.

Preferably, the working environment temperature range of the electrical connector is 0°C to 30°C.

Further, the contact angle is measured by a standard CDD camera and a contact angle meter.

The advantages of the present invention compared with the prior art are:

(1) The present invention adopts the method of changing the surface wettability, which effectively improves the difficulty of dew condensation on the surface of the electronic component, so that the refrigeration component can adapt to the working conditions of higher humidity and lower temperature, and the surface contains more water than the traditional surface. The layer approach is more concise, while helping to reduce excess. Experiments show that the technology of the present invention can effectively increase the difficulty of dew condensation on the surface.

(2) The present invention adopts the surface directional drainage design, so that even in the case of high humidity or low temperature, the droplets can flow away along the directional trajectory after the surface is dew condensation, and will not flow into the connector socket internal. This unique design enables electronic equipment to operate at higher humidity.

(3) The present invention can effectively prevent the droplets formed along the outside of the connector wires from entering the connector under low temperature or high humidity conditions by covering a water-proof suction cup on the connector joint.

(4) In the present invention, when the ambient humidity is particularly high or the humidity is general but the temperature is relatively low and dew is easy to condense, the suction cup is evacuated, so that the suction cup can be more firmly attached to the surface of the device, and at the same time, due to the formation of a partial vacuum environment, the The vacuum inside the suction cup is further improved to prevent condensation.

Description of drawings

Fig. 1 is the flow chart of the method for preventing condensation and water droplet infiltration of the electrical connector provided by the invention;

Fig. 2 is the schematic diagram of the placement method of the electrical connector provided by the invention;

Figure 3 is a comparison diagram of condensation on different surfaces in a specific environment provided by the invention;

4 is a schematic diagram of the integrated structure of an electrical connector connector and an anti-seepage suction cup provided by the invention;

FIG. 5 is a schematic diagram of the series placement of different connector suction cups provided by the invention;

Detailed ways

A method for preventing condensation on the surface of electrical connectors and infiltration of water droplets in a refrigeration assembly, as shown in Figure 1, is characterized in that the steps are as follows:

(1) Smooth and clean the surface where the electrical connector socket is located;

(2) Determine the placement method of the electrical connector according to the inclination angle between the electrical connector board and the horizontal direction;

(3) Calculate the contact angle between each area of the electrical connector board and the jack according to the environmental humidity where the electrical connector is located, select the surfactant to treat the surface of the area according to the range of the contact angle, and select according to the size of the narrowest part of each area of the electrical connector coating method;

(4) Judge whether to adopt the drainage design and whether to add the anti-seepage suction cup according to the placement method of the electrical connector and the relative humidity of the environment.

In the step (1), by coating a specific coating on the surface where the socket of the electrical connector is located, the surface tension of water droplets attached to the surface is reduced, the difficulty of forming water droplets is increased, and the surface condensation humidity is effectively improved. Among them, the specific operations of surface smoothing treatment are as follows:

(2a) Use alcohol to clean the surface of the electrical connector, and dry the cleaned electrical connector;

(2b) placing the dried electrical connector in step (2a) in an aqueous hydrophobic agent for 3-5 minutes;

(2c) Repeat steps (a) and (b) two to three times.

The placement method of the electrical connector is shown in Figure 2. In the step (2), on the basis of the surface smoothing treatment, the placement method of the electrical connector is determined according to the inclination angle between the electrical connector insert and the horizontal direction. If the inclination angle between the plug-in board and the horizontal direction is greater than 10 degrees, place the electrical connectors horizontally; if the inclination angle between the plug-in plug-in boards and the horizontal direction is not more than 10 degrees, place the electrical connectors vertically.

In the step (3), the contact angle of each area on the connector is calculated according to the electrical connector whose area is defined by itself, wherein the contact angle is related to the relative ambient humidity, and the selected electrical connector board The calculation method of the contact angle between each area and the jack is:

(i) When the electrical connector is placed horizontally, the contact angle of the electrical connector is:

y=0.0025×x+0.275;

(ii) When the electrical connector is placed vertically, the contact angle of the electrical connector is:

y=0.003×x+0.17;

where Y is the contact angle and X is the relative humidity of the environment.

The set contact angle is measured by a standard CDD camera and a contact angle meter.

On the basis of setting the contact angle of each area of the electrical connector, different types of surfactants are selected to coat each area. In the step (3), the contact angle range of the surfactant on the surface of the area is selected as follows :

(i) When the contact angle is not greater than 115 degrees, the surfactant is selected from silicone resin materials;

(ii) When the contact angle is 115 to 125 degrees, the surfactant is selected from organic fluorine materials;

(iii) When the contact angle is 125 to 135 degrees, the surfactant is selected from organic silicon material, organic paraffin material, and polytetrafluoroethylene coating;

(iv) When the contact angle is 135 to 145 degrees, the surfactant is selected as a water-based hydrophobic agent;

(v) When the contact angle is 145 to 155 degrees, the surfactant is selected from organically modified acrylic resin;

(vi) When the contact angle is greater than 155 degrees, the surfactant is selected from polystyrene mixed solution;

At the same time, the coating method of each region is selected according to the size of the narrowest part of each region. In the step (3), the coating method is selected according to the size of the narrowest part of each region of the electrical connector The specific determination method is as follows:

(i) When the size is not greater than 0.5cm, the micro-contact printing method is used for the electrical connectors in this area;

(ii) When the size is greater than 0.5cm, the direct physical coating method is used for the electrical connectors in this area.

In the step (4), when the electrical connector is placed vertically, the water droplet directional drainage process is performed on the electrical connector; when the electrical connector is placed horizontally, the directional drainage process is not performed. Among them, the directional drainage treatment can prevent the water droplets from flowing vertically downward under the action of gravity and then enter the electrical connector, and can change the flow trajectory of the water droplet so that it can bypass the location of the electrical connector.

In the step (4), when the relative humidity is greater than 65%, a water-proof suction cup is applied to the outer casing of the electrical connector, and a vacuum treatment is performed on the water-proof suction cup at the same time. The low pressure or near-vacuum inside the suction cup can effectively prevent dew condensation. At the same time, because the suction cup is closely attached to the surface, a partial protection is formed at the gap at the connector interface, so that even if there is dew condensation outside the suction cup, it is difficult to flow into the connector socket.

At the same time, the shape of the selected electrical connector is a square or a square envelope, the side length is not more than 5cm, and the other parts of the connector are determined according to the relative proportion; if the shape of the electrical connector is not square, the side length of the square is determined according to the envelope of its longest dimension , and encapsulate the electrical connectors in a square area.

The anti-condensation on the surface of the electrical connector and the infiltration of water droplets in the refrigeration assembly according to the present invention mainly include the use of surface smoothing treatment, the setting of a specific contact angle, the directional drainage technology of water droplets under the action of gravity, and the anti-seepage suction cup connector. technology to achieve. Surface modification technology mainly changes the wettability of the surface where the plug interface is located, thereby making the condensation conditions in the area near the connector more difficult than other areas. In this paper, for the requirements of normal operation of electrical connectors in the range of 0 °C to 30 °C and the air humidity is 60%, the contact angle design can make the area near the connector not affected by water vapor in the air within the above working conditions. At the same time, by designing the gradient contact angle shape and spacing, under higher humidity, even if dew droplets are formed on the periphery, it will not flow to the connector socket. Through the directional drainage technology of water droplets under gravity, even if the surface is inclined and vertical, the droplets formed when the humidity is high flows around the connector under the action of gravity, and will not flow into the connector. The water-proof suction cup type connector is suitable for occasions with higher humidity. The air pressure difference creates a closed area and improves the vacuum degree in the closed space, so that the electrical connector can meet the requirements of working under high humidity. As shown in Figure 3, it shows the comparison of the dew condensation effect between the surface modified and the surface without surface modification. It can be seen from the figure that the dew condensation on the modified surface has been greatly improved.

As shown in Figure 4, it shows the integrated structure diagram of the connector joint and the anti-seepage suction cup, in which the working principle of the vacuum suction cup hook is used. The air pressure inside the suction cup is much lower than the outside air pressure, so that there is a great pressure on the external surface of the suction cup to press the suction cup against the wall. If the surface of the wall is not smooth enough (with dust, oil, stains, etc.), the outside air will be pressed into the suction cup through the small gap between the suction cup and the wall, and the internal air pressure will increase, while the external atmospheric pressure will not Change. In this way, the difference in air pressure inside and outside is effective, the pressure on the external surface of the suction cup is reduced, and the suction cup is naturally easy to fall off. Therefore, in order to make the suction cup hook suck firmly, it must be sucked on a smooth surface. When sticking the suction cup, in order to stick more firmly, wipe or clean the surface to be stuck in advance, and then dry it for use. The modified coating should be as uniform as possible, and a small amount of waterproof glue should be applied to the inner surface of the suction cup at the same time. When sticking, press it from the middle to the four sides, which can better drive out the air in the suction cup, and the suction cup will stick more firmly. As shown in Figure 5, when necessary, vacuuming by machine can also be used. At this time, the same vacuum equipment can be used to vacuumize multiple suction cups.

The content not described in detail in the specification of the present invention belongs to the well-known technology of those skilled 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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