Heat crack prevention structure for multiple glass

Abstract

To provide a heat crack prevention structure for multiple glass preventing heat crack of the multiple glass separating an indoor side from an outdoor side for a whole of an indoor side covered with interior material, allowing incident sunlight to be rationally avoided while preventing deterioration of indoor comfortability and temperature control accuracy.SOLUTION: A heat crack prevention structure is provided with a gap space S interposed between interior material 7 and multiple glass 5, and gap space ventilation means 20 ventilating the gap space S in a mode of discharging air in the gap space W to an outdoor side O without discharging the air to an indoor side R.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a structure for preventing thermal cracking of insulating glass that separates the interior and exterior and whose entire interior side is covered with an interior material, and prevents thermal cracking of the insulating glass. [Background technology]

[0002] In some cases, insulating double-glazed glass is used as window glass to separate the interior and exterior of a general office, etc. When the interior side of such insulating glass is covered with an interior material, the temperature of the gap between the interior material and the insulating glass is likely to become high due to solar radiation, which can cause thermal cracking of the insulating glass (see, for example, Patent Document 1). Thermal cracking of double-glazed glass is a phenomenon that is particularly likely to occur in winter, when the outside temperature is significantly lower than the temperature of the gap between the interior materials and the double-glazed glass.The temperature difference between the peripheral part close to the window frame, which becomes cold in line with the outside temperature, and the part facing the gap creates extremely large thermal stress, resulting in breakage. In the technology described in Patent Document 1, multiple ventilation holes are provided in the interior material (light collecting device) so that the hot air that has become hot in the gap space due to sunlight is not allowed to remain in the gap space but is allowed to flow out through the ventilation holes to the inside of the room, thereby suppressing the rise in temperature in the gap space and preventing thermal cracking of the double-glazed glass. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6715183 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technology for preventing thermal cracking of insulating glass described in Patent Document 1, hot air in the gaps flows into the room, which may impair indoor comfort. In particular, when converting the room into a production room such as a clean room, if the entire indoor side of the insulating glass is covered with an interior material such as a backboard for ultraviolet protection, forming multiple ventilation holes in the interior material will allow a very large amount of hot air to flow out from the gaps to the indoor side, which will deteriorate the accuracy of temperature control in the room, and will also allow sunlight containing ultraviolet rays to enter the room through the multiple ventilation holes formed in the interior material, causing problems in the production in the room. In view of this situation, the main object of the present invention is to provide a technology that can rationally prevent the incidence of sunlight while avoiding a deterioration in indoor comfort and temperature control accuracy in a double-glazed thermal crack prevention structure that prevents thermal cracking of double-glazed glass that separates the interior and exterior and has the entire inside of the room covered with interior material. [Means for solving the problem]

[0005] The first characteristic configuration of the present invention is a structure for preventing thermal cracking of insulating glass that separates the interior from the exterior and prevents thermal cracking of insulating glass whose entire interior side is covered with an interior material, A gap space between the interior material and the double glazing; and gap space ventilation means for ventilating the gap space in a manner that exhausts the air in the gap space to the outside without exhausting it into the room.

[0006] According to this configuration, the gap space between the interior material and the double-glazed glass is ventilated by the gap space ventilation means, and hot air heated by sunlight in the gap space can be exhausted to the outside without being exhausted into a room used as a production room, for example. Therefore, the hot air in the gap space does not flow into the room, so that the deterioration of indoor comfort and temperature control accuracy due to the hot air can be avoided. Furthermore, since there is no need to provide ventilation holes in the interior material covering the entire indoor side of the double-glazed glass, it is possible to prevent sunlight from entering the room through the ventilation holes. Therefore, the present invention makes it possible to provide a technology that can rationally prevent the incidence of sunlight while avoiding a deterioration in indoor comfort and temperature control accuracy in a double-glazed thermal crack prevention structure that prevents thermal cracking of double-glazed glass that separates the interior and exterior and has the entire inside of the room covered with interior material.

[0007] A second characteristic configuration of the present invention is that the gap space ventilation means is configured to include an exhaust fan that forcibly expels air taken in from the gap space to the outside, and an air inlet that introduces air from within the room into the gap space.

[0008] According to this configuration, the exhaust fan forcibly expels the air taken in from the gap space to the outside, thereby allowing the air in the room to be naturally introduced into the gap space through the air inlet, which is called type 3 ventilation. Therefore, the gap space can be maintained in a negative pressure state relative to the room, so that it is possible to reliably prevent the hot air in the gap space from flowing into the room.

[0009] A third characteristic configuration of the present invention is provided with an indoor exhaust fan that forcibly sends air taken in from the room to the outside, The gap space ventilation means is configured to include an air duct that ventilates the gap space to the primary side of the indoor exhaust fan, and an air inlet that introduces indoor air into the gap space.

[0010] According to this configuration, the air taken in from the gap space through the ventilation duct is forcibly sent to the outside by the indoor exhaust fan, and the indoor air is naturally introduced into the gap space through the air inlet, which is called type 3 ventilation. Therefore, the gap space can be maintained at a negative pressure relative to the room, and it is possible to reliably prevent hot air from the gap space from flowing into the room. Furthermore, since the indoor exhaust fan is used for indoor ventilation and there is no need to install a dedicated exhaust fan, the introduction cost of the double-glazed thermal crack prevention structure can be reduced.

[0011] A fourth characteristic configuration of the present invention is configured such that the gap space ventilation means is capable of switching between a ventilation execution state in which ventilation of the gap space is executed and a ventilation stop state in which ventilation of the gap space is stopped, A temperature difference detection means for detecting a temperature difference between an outdoor side and an indoor side of the double glazing; and a control means for switching the state of the gap space ventilation means based on the detection result of the temperature difference detection means.

[0012] According to this configuration, when the temperature difference between the outdoor side and the indoor side of the insulating glass detected by the temperature difference detection means is relatively large and thermal cracking of the insulating glass is highly likely to occur, ventilation of the gap space is performed in the ventilation execution state, so that hot air heated by solar radiation in the gap space is exhausted to the outside, thereby reducing the temperature difference and preventing thermal cracking of the insulating glass. On the other hand, when the temperature difference between the outdoor side and the indoor side of the insulating glass detected by the temperature difference detection means is relatively small and thermal cracking of the insulating glass is low, ventilation of the gap space is stopped in the ventilation stop state, so unnecessary energy consumption can be avoided. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 shows the configuration of the thermal crack prevention structure for double-glazing according to the present embodiment and the state in which ventilation is stopped. [Diagram 2] FIG. 1 is a diagram showing the configuration of a thermal crack prevention structure for double-glazing according to an embodiment of the present invention and a ventilation execution state. [Diagram 3] An enlarged view of an air inlet portion in a structure for preventing thermal cracking of insulating glass according to another embodiment. [Figure 4] An enlarged view of an air inlet portion in a structure for preventing thermal cracking of insulating glass according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in Figure 1, the thermal crack prevention structure of this embodiment (hereinafter referred to as "the thermal crack prevention structure") is configured as a structure that prevents thermal cracking of a double-glazed glass 5 that separates the interior R from the exterior O and whose entire surface on the interior R side is covered with an interior material 7. In this embodiment, the room R was originally used as a general office, but its use has been changed to production use such as a clean room where the incidence of sunlight including ultraviolet rays is a problem. The insulating glass 5 is used as window glass to be fitted into a window 2 provided in an exterior wall 1 facing the outside O in order to improve the thermal insulation of the window 2 when the room R is used as a general office, which is its original purpose.

[0015] The interior material 7 is configured as a plate-like, non-translucent member such as a backboard fitted into a frame 8 provided on the interior R side along the window frame 4 of the window 2. A gap space S is provided between the interior material 7 and the insulating glass 5, covering the entire surface of the insulating glass 5 on the interior R side. In this way, when a gap space S is present between the double-glazed glass 5 facing the outdoors O and the interior material 7 covering the entire interior R side of the double-glazed glass 5, the temperature of the gap space S is likely to become high due to solar radiation from the outdoors O, causing a problem of thermal cracking of the double-glazed glass 5. Thermal cracking of the double-glazed glass 5 is likely to occur in winter, when the outside air temperature on the outside O side of the double-glazed glass 5 is significantly lower than the temperature of the gap space S on the interior R side of the double-glazed glass 5. In other words, such thermal cracking occurs when a very large thermal stress is generated in the double-glazed glass 5 due to the temperature difference ΔT between the peripheral portion close to the window frame 4, which becomes cold in line with the outside air temperature, and the portion facing the gap space S, causing the glass to break. This thermal crack prevention structure is designed to rationally prevent the incidence of sunlight while avoiding a deterioration in the comfort of the room R and the accuracy of temperature control, and its detailed configuration will be explained below.

[0016] In this thermal crack prevention structure, a gap space ventilation means 20 is provided to ventilate the gap space S in a manner that exhausts the air in the gap space S to the outdoors O (an example of the outside) without exhausting it into the room R. As shown in Figure 2, the gap space ventilation means 20 is configured to have an exhaust fan 21 that forcibly expels the air taken in from the gap space S to the outdoors O, and an air inlet 27 that introduces air from the room R into the gap space S. That is, so-called type 3 ventilation is performed for the gap space S, in which air from the room R is naturally introduced into the gap space S through the air inlet 27 by forcibly sending the air taken in from the gap space S by the exhaust fan 21 to the outside O. As a result, hot air that has become hot due to solar radiation in the gap space S is exhausted to the outside O without being exhausted into the room R used as a production room, for example. Furthermore, by performing the type 3 ventilation, the gap space S is maintained in a state of negative pressure with respect to the room R, so that the hot air in the gap space S is reliably prevented from flowing into the room R. Therefore, the hot air in the gap space S does not reliably flow into the room R, which preferably avoids deterioration of the comfort and temperature control accuracy of the room R due to the hot air. Furthermore, since an interior material 7 that does not have ventilation holes can be used to cover the entire surface of the double-glazed glass 5 on the room R side, the entrance of sunlight into the room R through the ventilation holes is prevented.

[0017] An indoor exhaust fan 21 is provided as an existing ventilation means for the room R, which forcibly sends air taken in from the room R through the indoor exhaust duct 22 to the outdoor O side. The gap space ventilation means 20 is configured to have an air duct 24 that ventilates the gap space S to the primary side of the indoor exhaust fan 21 in the indoor exhaust duct 22, and an air inlet 27 that introduces air from the room R into the gap space S, so that the indoor exhaust fan 21 functions as the exhaust fan 21 of the gap space ventilation means 20 described above. That is, the indoor exhaust fan 21 forcibly sends air taken in from the gap space S through the ventilation duct 24 to the outside O, thereby naturally introducing air from the room R into the gap space S through the air inlet 27, thereby providing so-called type 3 ventilation for the gap space S. This maintains the gap space S at a negative pressure relative to the room R, reliably preventing hot air from the gap space S from flowing into the room R. Furthermore, since the indoor exhaust fan 21 for ventilating the room R is used as the exhaust fan 21 of the gap space ventilation means 20, there is no need to provide a dedicated exhaust fan for this thermal crack prevention structure, and the introduction cost of this double-glazed thermal crack prevention structure is reduced.

[0018] Furthermore, in the gap space S, the ventilation duct 24 is connected near the top, and the air inlet 27 opens near the bottom. That is, in the gap space S, relatively low-temperature air from the room R flows in through the air inlet 27 near the bottom, and relatively high-temperature hot air flows out from the connection part of the ventilation duct 27 near the top. This allows the hot air in the gap space S to be discharged to the outside from the connection part of the ventilation duct 27 near the top while maintaining the stratified state, and therefore it is possible to suitably prevent the hot air from flowing out into the room R from the air inlet 27 near the bottom.

[0019] The present thermal crack prevention structure employs a configuration for preventing thermal cracking of the insulating glass 5 while avoiding unnecessary energy consumption, the details of which will be described below. The thermal crack prevention structure is provided with a control device 50 that functions as a temperature difference detection means 30 and a control means 40, which will be described later. Furthermore, the ventilation duct 24 is provided with a motor damper 25 that opens and closes in response to a command from the control device 50. As shown in FIG. 2, when the motor damper 25 is opened, the ventilation duct 24 connecting the primary side of the indoor exhaust fan 21 and the gap space S is opened, and a ventilation execution state in which ventilation of the gap space S is executed is established. On the other hand, as shown in FIG. 1, when the motor damper 25 is closed, the ventilation duct 24 connecting the primary side of the indoor exhaust fan 21 and the gap space S is blocked, and a ventilation stop state in which ventilation of the gap space S is stopped is established. That is, the gap space ventilation means 20 is configured to be able to switch between the ventilation execution state (see FIG. 2) and the ventilation stop state (see FIG. 1) by opening and closing the motor damper 25.

[0020] The temperature difference detection means 30, which is functioned by the control device 50, is configured as a means for acquiring the outside temperature To of the outdoors O measured by the outside temperature sensor 31 installed on the outside O side of the insulating glass 5 and the internal temperature Ti of the gap space S measured by the internal temperature sensor 32 installed on the indoor R side of the insulating glass 5, and detecting the temperature difference ΔT obtained by subtracting the outside temperature To from the internal temperature Ti. Note that in this embodiment, the temperature difference ΔT is calculated using the outside temperature To measured by the external temperature sensor 31, but instead of the measured outside temperature To, it is also possible to acquire the outside air temperature from meteorological data such as AMeDAS, and calculate the temperature difference ΔT using the acquired outside air temperature. The control means 40, in which the control device 50 functions, is configured as a means for automatically switching the state of the gap space ventilation means 20 between the ventilation execution state (see Figure 2) and the ventilation stop state (see Figure 1) by opening and closing the motor damper 25 based on the detection results of the temperature difference detection means 30. That is, when the temperature difference ΔT between the outdoor O side and the indoor R side of the insulating glass 5 detected by the temperature difference detection means 30 is equal to or greater than a predetermined set value, the control means 40 judges that there is a high possibility of thermal cracking of the insulating glass 5, and opens the motor damper 25 to enter the ventilation execution state (see FIG. 2), thereby ventilating the gap space S. In this way, hot air that has become hot due to solar radiation in the gap space S is exhausted to the outdoor O, reducing the temperature difference ΔT, and as a result, thermal cracking of the insulating glass 5 is prevented. On the other hand, if the temperature difference ΔT between the outdoor O side and the indoor R side of the insulating glass 5 detected by the temperature difference detection means 30 is less than the set value, the control means 40 determines that there is a low possibility of thermal cracking of the insulating glass 5, closes the motor damper 25 to enter the ventilation stopped state (see FIG. 1), and stops ventilation of the gap space S. This avoids unnecessary energy consumption. The set value set for the temperature difference ΔT to determine switching between the ventilation execution state and the ventilation stop state is determined based on the lower limit of the temperature difference between the outdoor O side and the indoor R side at which thermal cracking of the insulating glass 5 may occur, and is determined, for example, to be slightly lower than that lower limit.

[0021] The air inlet 27 is provided with a check damper 28 capable of opening and closing the air inlet 27. In the ventilation stop state (see FIG. 1) in which the internal pressure of the gap space S and the internal pressure of the room R are substantially the same, the check damper 28 is maintained in a closed state, and the air inlet 27 is closed. On the other hand, in the ventilation execution state (FIG. 2) in which the internal pressure of the gap space S is lower than the internal pressure of the room R, the check damper 28 transitions to an open state due to the pressure difference, and the air inlet 27 is opened. In this way, in the ventilation stop state, the air inlet 27 is closed to prevent air from passing between the room R and the gap space S, so that, for example, the outflow of hot air from the gap space S to the room R can be prevented, and deterioration of the comfort of the room R can be avoided. On the other hand, in the ventilation execution state, the air inlet 27 is opened to introduce air from the room R through the air inlet 27 into the gap space S, and the temperature rise of the gap space S due to solar radiation can be suppressed.

[0022] In this embodiment, a check damper 28 is provided in the air inlet 27 as an opening / closing means for opening the air inlet 23 in the ventilation execution state (see Figure 2) and closing the air inlet 27 in the ventilation stop state (see Figure 1). However, the opening / closing means is not limited to the check damper 23 and may be an opening / closing damper of a different form. Also, such an opening / closing means may be omitted and the air inlet 27 may be always open. In this case, it is desirable to provide a shading means in the air inlet 27 for preventing sunlight from entering the room R from the gap space S while allowing air to flow from the room R into the gap space S. For example, as shown in FIG. 3, a shading louver 41 capable of blocking sunlight entering horizontally and diagonally downward from the gap space S toward the room R may be provided as the shading means in the air inlet 27. Also, as shown in FIG. 4, a shading wall 42 extending from the upper surface of the frame body 8 to above the lower end of the interior material 7 may be provided as the shading means at a location slightly away from the air inlet 27 toward the room R, and the shading wall 42 can block sunlight entering horizontally and diagonally downward from the gap space S toward the room R through the air inlet 27.

[0023] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied alone, but may also be applied in combination with the configurations of other embodiments.

[0024] (1) In the above embodiment, the gap space ventilation means 20 is composed of an exhaust fan 21 and an air inlet 27, and is configured to perform so-called type 3 ventilation for the gap space S, in which air taken in from the gap space S by the exhaust fan 21 is forcibly sent to the outdoors O, thereby naturally introducing air from the room R into the gap space S through the air inlet 27. However, it may also be configured to perform so-called type 1 ventilation or type 2 ventilation for the gap space S.

[0025] (2) In the above embodiment, the indoor exhaust fan 21 for ventilation of the room R is used as the exhaust fan 21 of the gap space ventilation means 20, but an exhaust fan dedicated to the gap space ventilation means 20 may be provided separately from the indoor exhaust fan 21.

[0026] (3) In the above embodiment, the temperature difference ΔT between the internal temperature Ti and the external temperature To was used as a switching index for the control means 40 to automatically switch the state of the gap space ventilation means 20 between the ventilation execution state (see Figure 2) and the ventilation stop state (see Figure 1). However, this switching index may be changed as appropriate, and the state of the gap space ventilation means 20 may be configured to always be maintained in the ventilation execution state (see Figure 2) without switching the state. [Explanation of symbols]

[0027] 5. Double-glazing 7 Interior materials 20. Ventilation methods for gaps 21 Indoor exhaust fan (exhaust fan) 24 Ventilation duct 27 Air inlet 30 Temperature difference detection means 40 Control Means O outdoor R Indoor S Gap space ΔT temperature difference

Claims

1. A structure for preventing thermal cracking of insulating glass that separates the indoor and outdoor spaces and has the entire indoor side covered with an interior material, A gap space between the interior material and the double glazing; A double-glazing thermal crack prevention structure comprising: a gap space ventilation means for ventilating the gap space in a manner that exhausts the air in the gap space to the outside without exhausting it into the room.

2. The thermal crack prevention structure of claim 1, wherein the gap space ventilation means is configured to include an exhaust fan that forcibly expels air taken in from the gap space to the outside, and an air inlet that introduces air from the room into the gap space.

3. An indoor exhaust fan is provided to forcibly expel air taken in from the room to the outside, The thermal crack prevention structure of claim 1, wherein the gap space ventilation means is configured to include an air duct that ventilates the gap space to the primary side of the indoor exhaust fan, and an air inlet that introduces air from the room into the gap space.

4. The gap space ventilation means is configured to be switchable between a ventilation execution state in which ventilation of the gap space is executed and a ventilation stop state in which ventilation of the gap space is stopped, A temperature difference detection means for detecting a temperature difference between an outdoor side and an indoor side of the double glazing; The double-glazing thermal crack prevention structure according to any one of claims 1 to 3, further comprising a control means for switching the state of the gap space ventilation means based on the detection result of the temperature difference detection means.

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