TW201621197A - Automatic valve switching according to the humidity - Google Patents

Abstract

An automatic valve switching according to the humidity for a base wall preventing moisture flowing between an interior space and outside, comprises a vent and a switch unit. The vent runs through the base wall. The switch unit is provided in the base wall, can deform after absorbing moisture, and includes a closing portion with position corresponding to the vent. When the switch unit is in a dry environment, the closing portion and the vent are not airtight, and when the switch unit is in a humid environment, the closing portion closes the vent. Through the switch unit that can deform after absorbing moisture, when the switch unit is in the dry environment, the closing portion and the vent are not airtight, and the moisture in the internal space can escape, if there is any. When the switch unit is in the humid environment, the closing portion closes the vent to prevent outside moisture from entering, so that the internal space can remain dry.

Description

Valve that automatically switches by humidity

The present invention relates to a valve, and more particularly to a valve that automatically switches by humidity.

Generally, the circuit equipment needs to be in a dry environment, especially the circuit in the outdoor electrical equipment, such as the circuit board on the circuit board of the street lamp. Because of the frequent moisture in the outdoor environment, it is particularly necessary to prevent the circuit board from contacting the outside water. . One way is to completely isolate the circuit board from the outside world in an attempt to prevent the outside water from entering the space where the circuit is located. However, permanent and complete sealing is very difficult. Once water vapor enters the originally closed space, it makes the water vapor It is difficult to escape again. Therefore, how to design a component that is simple in structure and low in cost and can be widely used in, but not limited to, outdoor electrical equipment for humidity control has become a subject worthy of study.

Accordingly, it is an object of the present invention to provide a valve that automatically switches by humidity.

Thus, the valve of the present invention according to the humidity automatic switch is implemented in some In the aspect, it is a base wall suitable for a water flow passing through an inner space and an outside world, and includes a gas hole and a switch unit.

The air hole runs through the base wall. The switch unit is disposed on the base wall and can be deformed by absorbing moisture, and includes a closed portion corresponding to the air hole. When the switch unit is in a dry environment, the closed portion and the air hole are not sealed, when the switch unit is The closure closes the air vent when in a humid environment.

In some embodiments, the switch unit further includes a flexible substrate and a hygroscopic stretchable plate that are stacked one on another, the flexible substrate is located on a side close to the base wall, and the hygroscopic flexible plate is opposite Located on the other side of the flexible substrate, the closed portion is a closed protrusion disposed on the flexible substrate adjacent to one side of the base wall and corresponding to the air hole, and the closed substrate is relatively closed The other end of the protruding block is fixed to the base wall. When the switch unit is in a dry environment, the length of the hygroscopic stretchable plate is smaller than the flexible substrate, and the combined flexible substrate and the hygroscopic flexible plate are integrally Bending away from the base wall, the closing protrusion and the air hole are not sealed, and when the switch unit is in a humid environment, the hygroscopic stretch plate absorbs sufficient moisture to extend to a length greater than or equal to the flexible substrate The combined flexible substrate and the hygroscopic stretch panel are integrally bent toward the base wall, and the closing projection closes the air hole.

In some embodiments, the hygroscopic stretch panel is made of a hygroscopic plastic, and the hygroscopic stretch panel has a coefficient of wet expansion that is greater than a coefficient of wet expansion of the bendable substrate.

In some embodiments, the flexible substrate and the hygroscopicity The telescopic plate is located on the side of the base wall opposite to the inner space and located outside.

In some embodiments, the vent has at least one section that is frustoconical, and at least one of the closed ridges has a corresponding frustoconical shape.

In some embodiments, the switch unit further includes an elastic ring disposed on the segment of the frustoconical shape of the closure projection.

In some embodiments, the switch unit further includes a fixing plate fixed to the base wall, the closing portion is a hygroscopic stud extending from the fixing plate toward the air hole, when the switch unit is in a dry environment The hygroscopic stud is at least partially non-contacting with the wall surrounding the pore defining the vent, such that the hygroscopic stud and the vent are non-sealed, and the hygroscopic protrusion is when the switch unit is in a humid environment. The column will absorb moisture and expand to close the pore.

In some embodiments, the air hole includes a cylindrical cylindrical hole segment and a frustoconical frustoconical hole segment, the hygroscopic protruding column including a cylindrical cylindrical segment and a frustoconical shape The frustoconical section, when the cylindrical section is in a humid environment, absorbs moisture and expands, thereby driving the frustoconical section to close the frustoconical section of the vent to close the vent.

In some embodiments, the switch unit further includes an elastic ring disposed on the frustoconical section of the hygroscopic stud.

In some embodiments, the fixing plate is located on the other side of the base wall relative to the inner space.

The utility model has the advantages that: the switch unit deformed by absorbing water vapor, the closed portion does not close the air hole when the switch unit is in a dry environment, and can escape when the inner space contains moisture, when the switch unit is at the switch unit The closed portion closes the air hole in a humid environment, prevents external moisture from entering, and keeps the internal space dry, so that the object of the present invention can be achieved.

1‧‧‧ stomata

11‧‧‧ cylindrical section

12‧‧‧Frustrated conical section

2‧‧‧Switch unit

21‧‧‧Flexible substrate

22‧‧‧Hydraulic expansion plate

23‧‧‧Closed projection

24‧‧‧ fixed board

25‧‧‧hygroscopic pillar

251‧‧‧Cylindrical section

252‧‧‧Frustum

29‧‧‧Flexible ring

6‧‧‧ base wall

7‧‧‧Internal space

8‧‧‧ outside

9‧‧‧Circuit board

Other features and advantages of the present invention will be apparent from the detailed description of the embodiments of the present invention. FIG. 1 is a partial cross-sectional view showing the first embodiment of the valve according to the present invention. A closed projection and a vent are non-closed; FIG. 2 is a partial cross-sectional view showing the closed projection of the valve according to the first embodiment of the present invention, which closes the vent; FIG. 3 is a partial cross-sectional view; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a partial cross-sectional view showing a second embodiment of the valve according to the humidity automatic switch of the present invention; and FIG. 4 is a partial cross-sectional view showing the valve of the present invention according to the humidity automatic switch In the second embodiment, the hygroscopic stud encloses the air vent.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 1 and 2, the first embodiment of the valve according to the humidity automatic switch of the present invention is applied to a base wall 6 which is separated from the water of the outside 8 by an internal space 7. For example, the base wall 6 is one of the shell walls of an outdoor electric device such as a street lamp, and the inner space 7 of the street lamp is separated from the water of the outside 8 to allow the inner space 7 to be disposed. A circuit board 9 remains dry.

As stated in the previous technical section, permanent and complete containment is very difficult. Therefore, another way different from the prior art is to design a vent switch that closes the vent to prevent moisture from entering when the outside humidity is high, and allows the vent to open to assist the escape of moisture when the outside humidity is low. However, outdoor electrical equipment, such as street lamps, are usually provided in a large number and are not easy to repair. If the humidity is sensed using a precision humidity sensing chip and the pneumatic circuit is controlled with a logic circuit, the cost may be high and may be easily broken.

In order to solve the problem, the valve according to the humidity automatic switch of the present invention comprises a gas hole 1 penetrating through the base wall 6 and a switch unit 2, the switch unit 2 is disposed on the base wall 6 and can be deformed by absorbing moisture. And including a closed portion corresponding to the air hole 1 (the closed protrusion 23 described later), the closed portion and the air hole 1 are not sealed when the switch unit 2 is in a dry environment, when the switch unit 2 is in a humid environment The closing portion closes the air hole 1.

In detail, in the embodiment, the switch unit 2 further includes a flexible substrate 21 and a hygroscopic stretchable plate 22 which are combined with each other, and the flexible substrate 21 is located near one side of the base wall 6. The hygroscopic stretch panel 22 is located on the other side with respect to the flexible substrate 21. The material of the hygroscopic stretch panel 22 is hygroscopic plastic or high hygroscopic plastic, and the material of the flexible substrate 21 is non-hygroscopic or low hygroscopic plastic. The moisture expansion coefficient of the moisture absorbing panel 22 is greater than the coefficient of wet expansion of the flexible substrate 21, that is, the amount of expansion of the moisture absorbing panel 22 when absorbing moisture is greater than the amount of expansion of the flexible substrate 21. The amount of shrinkage of the hygroscopic stretchable panel 22 when the moisture is removed is greater than the amount of shrinkage of the bendable substrate 21.

The closing portion is a one disposed on a side close to the base wall 6 The curved substrate 21 is positioned at a position corresponding to the closing projection 23 of the air hole 1, and the other end of the flexible substrate 21 opposite to the closing projection 23 is fixed to the base wall 6. The flexible substrate 21 is exemplarily bonded to the hygroscopic stretch panel 22 in an adhesive manner, and is also fixed to the base wall 6 by means of an adhesive. However, not limited thereto, the combined manner may also be a two-shot injection molding method, in which one of the molded flexible substrate 21 and the hygroscopic stretchable plate 22 is first injected, and then cooled and then injected to form another one; The manner of fixing to the base wall 6 may also be fixed by other fixing members such as screws or the like. Further, the closing projection 23 is integrally formed by using the same plastic material as the flexible substrate 21, for example.

When the switch unit 2 is in a dry environment, the length of the hygroscopic stretchable plate 22 is smaller than the flexible substrate 21, and the combined flexible substrate 21 and the hygroscopic stretchable plate 22 are integrally away from the base wall 6. The direction is curved, so that the closing protrusion 23 and the air hole 1 are not sealed. At this time, the valve according to the humidity automatic switch of the present invention is in an open state, allowing air circulation of the internal space 7 and the outside environment 8, if the internal space 7 contains water. Gas can escape. When the switch unit 2 is in a humid environment, the hygroscopic stretch panel 22 absorbs sufficient moisture to elongate to a length greater than or equal to the bendable substrate 21, and the bendable substrate 21 and the hygroscopic stretch panel 22 are combined. The whole body is bent toward the base wall 6, and the closing protrusion 23 closes the air hole 1. At this time, the valve according to the humidity automatic switch of the present invention is in a closed state, and the air in the internal space 7 and the outside 8 is blocked to block the outside water. Gas enters.

In the present embodiment, the flexible substrate 21 and the hygroscopic stretch panel 22 are located on the side of the base wall 6 with respect to the internal space 7. The outside 8 is not limited thereto, as long as the hygroscopic stretch panel 22 can contact the air of the outside 8.

The air vent 1 is frustoconical, but not limited thereto, and at least one of the vents is frustoconical; the closed protrusion 23 is also frustoconical, but not limited thereto. Corresponding to at least one of the sections being frustoconical, such that the closing protrusion 23 and the opening and closing process of the air hole 1 are less likely to be interfered.

The switch unit 2 further includes an elastic ring 29 disposed on the section of the frustoconical shape of the closing projection 23 to reinforce the degree of sealing of the closing projection 23 when the air vent 1 is closed. Specifically, the closing protrusion 23 is provided with a corresponding annular groove (not shown) for the elastic ring 29 to be mounted. For example, the elastic ring 29 is made of rubber.

The above is the embodiment of the first embodiment, mainly by combining two plastic sheets of different hygroscopic properties (the flexible substrate 21 and the hygroscopic stretchable plate 22) into one body, when the humidity changes, both sides The expansion and contraction of the plastic will be different, causing the structure to bend and achieve the effect of automatically opening and closing the pores according to the humidity.

Referring to FIG. 3 and FIG. 4, the second embodiment of the valve according to the humidity automatic switch of the present invention is substantially the same as the first embodiment, and is applicable to the environment of the base wall 6, the internal space 7, the external environment 8, etc. of the first embodiment. The air hole 1 penetrating the base wall 6 and the switch unit 2 including the closed portion (the hygroscopic stud 25 to be described later in the present embodiment) including the air hole 1 are included. The difference is that the switch unit 2 further includes a fixing plate 24 fixed to the base wall 6 , and the closing portion is a suction extending from the fixing plate 24 toward the air hole 1 . The wet stud 25 is made of a hygroscopic plastic. When the switch unit 2 is in a dry environment, the hygroscopic stud 25 is at least partially non-contact with the wall surrounding the hole defining the air hole 1 so that the hygroscopic stud 25 and the air hole 1 are not sealed. In the state in which the valve according to the humidity automatic switch is opened, the air in the internal space 7 and the outside 8 is allowed to flow, and if the internal space 7 contains moisture, it can escape. When the switch unit 2 is in a humid environment, the hygroscopic column 25 absorbs moisture and expands and expands to close the air hole 1. At this time, the valve according to the humidity automatic switch of the present invention is in a closed state, and blocks the internal space 7 and The air circulation of the outside 8 prevents the outside water from entering. In this embodiment, the fixing plate 24 is fixed to the base wall 6 at both ends, but not limited thereto, as long as the hygroscopic stud 25 can be supported, especially in the hygroscopic column 25 to absorb moisture. When the expansion is elongated to close the air hole 1, the fixing plate 24 is sufficient to support. The material of the fixing plate 24 is not limited, and may be a non-hygroscopic material, a low hygroscopic material or a (high) hygroscopic material.

In this embodiment, the fixing plate 24 is located on the other side of the base wall 6 with respect to the internal space 7 but is not limited thereto. The hygroscopic stud 25 extends in the air hole 1 on the fixing plate 24 and from the outside 8 toward the inner space 7. The fixing plate 24 does not close the opening of the air hole 1 adjacent to the outer surface 8, the hygroscopicity. The stud 25 can contact the air of the outside 8.

Specifically, in the present embodiment, the air hole 1 includes a cylindrical cylindrical hole section 11 and a frustoconical frustoconical hole section 12, and the hygroscopic protruding column 25 includes a cylindrical shape and an outer diameter. Less than the inner diameter of the cylindrical hole section 11 The cylindrical section 251 and the frustoconical frustoconical section 252 are hygroscopic plastics, and the frustoconical section 252 is a non-hygroscopic or low hygroscopic plastic. When the hygroscopic stud 25 is in a humid environment, it absorbs moisture and expands, and mainly the cylindrical section 251 expands, so that the frustoconical section 252 closes the frustoconical hole section 12 of the air hole 1 to close the air hole. 1. However, it is not limited thereto, as long as the moisture absorbing column 25 can block the air hole 1 when the water vapor is expanded, and the air of the inner space 7 and the outside 8 can be circulated through the air hole 1 when the moisture is not absorbed. . The reason why the frustoconical section 252 uses a non-hygroscopic or low-absorbent plastic is that the internal fringe section 252 is prevented from being in an expanded state when the internal space 7 is high in humidity. In this embodiment, the width of the fixing plate 24 (the direction perpendicular to the paper) is smaller than the inner diameter of the air hole 1 so that the air of the outer surface 8 can enter the air hole 1, but not limited thereto, or the fixing plate 24 is provided with a perforation (not shown) or the like to allow air to flow, or the fixing plate and the base wall are connected to each other by a fixing means (not shown).

Similarly, the switch unit 2 further includes the elastic ring 29 disposed on the frustoconical section 252 of the hygroscopic stud 25 to enhance the airtightness when the air hole 1 is closed.

The above is the embodiment of the second embodiment, which mainly opens and closes the air hole 1 according to the humidity by the change of the expansion and contraction of the plastic material directly passing through the hygroscopic column 25.

In summary, the switch unit 2, which is deformed by the absorption of moisture, is not closed when the switch unit 2 is in a dry environment (the closed protrusion 23 or the hygroscopic stud 25) and the air hole 1 Closed, if inside When the switch unit 2 is in a humid environment, the closed portion closes the air hole 1 to prevent the outside air 8 from entering, so that the internal space 7 is kept dry, so that the present invention can be achieved. purpose.

However, the above is only the embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and the patent specification of the present invention are still It is within the scope of the patent of the present invention.

1‧‧‧ stomata

2‧‧‧Switch unit

21‧‧‧Flexible substrate

22‧‧‧Hydraulic expansion plate

23‧‧‧Closed projection

29‧‧‧Flexible ring

6‧‧‧ base wall

7‧‧‧Internal space

8‧‧‧ outside

9‧‧‧Circuit board

Claims (10)

The utility model relates to a valve which is automatically switched according to humidity, and is suitable for a base wall which is separated from an internal space and an external water flow, and comprises: an air hole running through the base wall; and a switch unit disposed on the base wall to be absorbed The water gas is deformed and includes a closed portion corresponding to the air hole. When the switch unit is in a dry environment, the closed portion and the air hole are not sealed, and the closed portion closes the air hole when the switch unit is in a humid environment. The valve of the automatic switch according to claim 1, wherein the switch unit further comprises a flexible substrate and a hygroscopic flexible plate which are stacked one on another, the flexible substrate being located on a side close to the base wall. The hygroscopic flexible plate is located on the other side with respect to the flexible substrate, and the closing portion is a closed protrusion disposed on the flexible substrate adjacent to one side of the base wall and corresponding to the air hole. The other end of the flexible substrate is fixed to the base wall relative to the closed protrusion. When the switch unit is in a dry environment, the length of the hygroscopic stretchable plate is smaller than the flexible substrate, and the flexible substrate and the combined The hygroscopic stretchable plate is bent in a direction away from the base wall, so that the closing protrusion and the air hole are not sealed, and when the switch unit is in a humid environment, the hygroscopic stretch plate absorbs sufficient moisture to elongate to The length is greater than or equal to the flexible substrate, and the combined flexible substrate and the hygroscopic flexible plate are integrally bent toward the base wall, so that the closing protrusion closes the air hole. The valve according to claim 2, wherein the hygroscopic expansion plate is made of hygroscopic plastic, and the hygroscopic expansion plate is wet-expanded. The coefficient is greater than the coefficient of wet expansion of the flexible substrate. The valve according to claim 2, wherein the flexible substrate and the hygroscopic stretch panel are located on a side of the base wall opposite to the inner space and located outside the base. The valve according to claim 2, wherein the air hole has at least one section of a truncated cone shape, and at least one section of the closing protrusion has a corresponding frustoconical shape. The valve according to claim 5, wherein the switch unit further comprises an elastic ring disposed on the section of the frustoconical shape of the closing protrusion. The valve of the automatic switch according to claim 1, wherein the switch unit further comprises a fixing plate fixed to the base wall, wherein the closing portion is a hygroscopic protruding column extending from the fixing plate toward the air hole. When the switch unit is in a dry environment, the hygroscopic stud is at least partially non-contact with the wall surrounding the hole defining the air hole, so that the hygroscopic stud and the air hole are not sealed, when the switch unit is wet In the environment, the hygroscopic column absorbs moisture and expands to close the pore. The valve according to claim 7, wherein the air hole comprises a cylindrical cylindrical hole segment and a frustoconical frustoconical hole segment, wherein the hygroscopic protruding column comprises a cylindrical cylinder. The segment and the frustoconical frustoconical section, when the cylindrical section is in a humid environment, absorb moisture and expand, thereby driving the frustoconical section to close the frustoconical section of the air hole to close the air hole. a valve that automatically switches according to humidity according to claim 8, wherein the switch is The element further includes an elastic ring disposed on the frustoconical section of the hygroscopic stud. The valve according to claim 7, wherein the fixing plate is located on the other side of the base wall with respect to the inner space.