CN100557157C - Roof covering heat shading apparatus - Google Patents

Abstract

The invention discloses a roof heat-shielding device, which comprises a heat-shielding curtain, a controller and a temperature sensor. The heat-shielding curtain is arranged between the roof of a building and an indoor enclosure structure under the roof; the temperature sensors are respectively located under the roof. The surface, the surface of the indoor enclosure structure under the roof, and the indoor air side are three positions, and all sensors are connected to the input end of the controller, and the controller controls the action of the driving belt; the driving belt is connected to control the expansion and retraction of the heat-shielding curtain. Raised shade drive shaft. The invention can effectively reduce the radiant heat entering and leaving the room through the roof layer; and can control the unfolding and retracting of the heat-shielding curtain according to the actual demand of the indoor thermal environment, thereby improving the indoor thermal environment to the greatest extent and improving indoor thermal comfort. It is suitable for various roof types such as sloping roofs (with or without suspended ceilings), flat roofs (with or without suspended ceilings), double-layer ventilated roofs, etc.

Description

Roof shielding device

technical field

The invention relates to a heat insulation device, in particular to a roof heat shielding device.

Background technique

Improving the thermal insulation performance of the roof is especially important to reduce the solar radiation heat entering the building through the roof in summer, and it is an important measure to improve the indoor thermal environment. At present, the commonly used roof thermal insulation technology is to lay a thermal insulation layer on the structural layer of the roof, and then lay a roof with a waterproof layer and a protective layer. Thermal performance does not guarantee a good thermal environment indoors.

Using highly reflective materials to improve the summer heat insulation capacity of the roof is a new technical measure, which is usually used in double-layer ventilated roofs. A layer of highly reflective materials is attached to the lower surface of the upper roof to reduce the heat transfer through the roof in summer. However, due to the fixed material layer, when the indoor temperature is low in winter and the outdoor solar radiation is strong, the solar radiant heat is blocked from entering the room, and this heat cannot be effectively used to increase the indoor temperature.

Contents of the invention

Aiming at the defects of the above-mentioned prior art, the present invention provides a roof heat-shielding device, which can control the expansion and heating of the heat-shielding curtains arranged under the roof according to the indoor thermal environment requirements and the direction of radiation heat flow between the roof and the relative indoor enclosure structure. It can be put away for automatic control to control the radiant heat entering and leaving the room through the roof, so as to achieve the purpose of improving the indoor thermal environment. The device is suitable for sloping roofs (with or without suspended ceilings), flat roofs (with or without suspended ceilings), double-layer ventilated roofs and other roof forms.

In order to realize the object of the above invention, the roof heat-shielding device of the present invention includes a heat-shielding curtain, a controller and a temperature sensor, and the heat-shielding curtain is arranged between the building roof and the indoor enclosure structure under the roof; the temperature sensors are respectively It is located on the lower surface of the roof, the surface of the indoor enclosure structure under the roof, and the indoor air side, and all sensors are connected to the input end of the controller, and the controller controls the action of the driving belt; the driving belt is connected to control the heat shielding curtain Extended and retracted shade drive shaft.

Further, the heat-shielding curtain can be a foldable heat-shielding curtain, which is composed of multiple heat-shielding panels with a certain hardness, and different heat-shielding panels are flexibly connected; the heat-shielding curtain can also be a scroll-type heat-shielding curtain. curtain.

The above-mentioned heat-shielding curtain is made of low-emissivity and high-reflectivity materials, and the reflectivity for low-temperature heat radiation should reach above 0.8. When working, it can be unfolded or stowed. When unfolded, the heat-shielding curtain is arranged in parallel at a certain distance under the roof.

For the heat-shielding effect of the roof heat-shielding curtain, the demand for indoor thermal environment and the direction of radiant heat flow between the roof and the indoor envelope under the roof are two key determinants. For buildings, when the summer climate is hot and the solar radiation is strong, the solar radiation heat entering the room through the roof of the building seriously affects the indoor thermal environment. According to the weakening principle of radiation heat transfer, heat-shielding curtains are arranged under the roof in summer. It can effectively reduce the radiant heat entering the room and improve the indoor thermal environment; in winter, when the outdoor solar radiation is strong and the room temperature is low, the solar radiant heat entering the room through the roof is a favorable factor for improving the indoor thermal environment. If the heat-shielding curtain is still arranged under the roof, it will weaken the solar radiation heat entering the room through the roof; except for the typical situation when the solar radiation is strong in winter and summer, at night, transitional seasons, rainy weather and other climate conditions, the roof If there is a temperature difference with the indoor enclosure structure under the roof, there will still be radiant heat entering and leaving the room through the roof, which will have a favorable or unfavorable impact on the indoor thermal environment.

The above-mentioned roof heat-shielding device combines the above-mentioned principles, uses a temperature sensor arranged indoors to measure the indoor air temperature, and compares it with a preset reference value to judge the indoor thermal environment, and then through the lower surface of the roof and the relative indoor enclosure under the roof Temperature sensors are arranged on the surface of the structure, and the two temperatures are compared to determine the direction of heat flow between the roof and the relative indoor enclosure. According to the needs of the indoor thermal environment and the direction of radiation heat flow between the roof and the indoor enclosure structure, the controller drives the drive belt of the controller through its internal drive mechanism to realize the expansion and retraction of the heat-shielding curtain, so as to achieve the control of entering and exiting the room through the roof. radiant heat, thereby improving the indoor thermal environment.

In summary, the roof heat shielding device provided by the present invention can effectively improve the indoor thermal environment of a building and reduce indoor air conditioning or heating energy consumption, and is an efficient and adaptive roof heat insulation device.

Description of drawings

Figure 1 is a schematic diagram of the heat shield;

Fig. 2 is a structural representation of the present invention;

Fig. 3 is a schematic diagram of the folding heat shield described in the embodiment;

Fig. 4 is the control schematic diagram that the present invention realizes;

Fig. 5 is the heat insulation schematic diagram of the foldable heat-shielding curtain on the flat roof with suspended roof layer in embodiment 1;

Fig. 6 is the heat insulation schematic diagram of the flat roof folding type heat-shielding curtain without suspended ceiling layer in embodiment 2;

Fig. 7 is a schematic diagram of a roller-type heat-shielding blind.

1-upper surface 2-lower surface 3-heat shield

201-Surface temperature sensor under the roof 202-Surface temperature sensor of the relative enclosure structure under the roof

203-Indoor temperature sensor 204-Controller

205-Heat curtain 501-Heat curtain drive shaft

502 - drive belt

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

The weakening effect of the heat-shielding curtain on the radiation heat transfer between the roof and the relative indoor enclosure structure under the roof is realized through the following principles:

According to the basic principle of radiation heat transfer in heat transfer: in order to reduce the radiation heat transfer between the two surfaces, the method of arranging a heat shield between the two radiation surfaces can be adopted. The so-called heat shield refers to a thin plate arranged between two radiative heat transfer surfaces to weaken the radiative heat transfer.

The following is an example of placing a heat shield with low emissivity between parallel plates to reduce the radiation heat transfer between two parallel plates to illustrate the working principle of the heat shield. The temperature and emissivity of the radiation surface and the metal plate are as follows: As shown in Figure 1, assuming that the emissivity of the two flat plates ε ₁ =ε ₂ =0.8, and the emissivity of the heat shield ε ₃ =0.2, then:

q ₁₃ ＝ε ₁₃ (E _b1 -E _b3 ) (1)

q ₃₂ =ε ₃₂ (E _b3 -E _b2 ) (2)

In the formula, q _{1, 3} and q _{3, 2} are the radiation heat exchange heat flux density of the upper surface 1 to the heat shield 3 and the heat shield 3 to the lower surface 2, respectively.

The system emissivity of the surface 1, 3 and surface 3, 2 systems are respectively:

${\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 13</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 0.8</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 0.2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.1905</span>}$

${\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 32</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 0.2</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 0.8</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.1905</span>}$

The emissivity of the two systems is equal, so ε ₁₃ =ε ₃₂ =ε _s =0.1905.

Under thermal steady-state conditions, q ₁₃ =q ₃₂ =q ₁₂ , adding formulas (1) and (2) gives:

${\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="q"\; filenames="C20081003133400101.png"\; state="\{\{state\}\}"><figure-callout\; id="2"\; label="q"\; filenames="C20081003133400101.png"\; state="\{\{state\}\}">q</figure-callout></figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1,2</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.09525</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$

When no heat shield is arranged, the heat flux density of the radiation heat exchange between the upper surface 1 and the lower surface 2 is:

${\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="q"\; filenames="C20081003133400101.png"\; state="\{\{state\}\}"><figure-callout\; id="2"\; label="q"\; filenames="C20081003133400101.png"\; state="\{\{state\}\}">q</figure-callout></figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1,2</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$

$<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$

$<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 0.8</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 0.8</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$

$<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.6667</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$

Comparing the heat flux density of radiation heat exchange with and without heat shields, it shows that the radiation heat transfer between upper surface 1 and lower surface 2 after heat shields are arranged is 1/7 of that without heat shields, and the radiation heat transfer is greatly reduced. In order to make the effect of weakening the radiation heat transfer more significant, the heat shield can actually be made of materials with lower emissivity. If a heat shield with an emissivity of 0.05 is arranged between two parallel surfaces with an emissivity of 0.8, the radiation heat can be reduced to 1/27 of the original.

Referring to Fig. 2 , the temperature sensor 201 on the lower surface of the roof is arranged on the lower surface of the uppermost roof, and the temperature sensor 202 on the surface of the enclosure structure under the roof is arranged in different positions for different roof forms; , it is arranged on the indoor ground surface under the roof; for flat roofs or sloping roofs with suspended ceilings, it is arranged on the upper surface of the suspended ceiling; for double-layer ventilated roofs, it is arranged on the upper surface of the lower roof. The foldable heat-shielding curtain 205 is arranged in parallel at a certain distance below the uppermost roof, and the controller 204 controls the unfolding and retracting of the foldable heat-shielding curtain 205 according to the signals of the temperature sensors 201 , 202 and 203 .

Referring to FIG. 3 , FIG. 3 is a schematic structural diagram of a foldable heat-shielding curtain 205 used in the following embodiments.

Referring to Figure 4, first set two different indoor high temperature reference values TH and low temperature reference values TL, and then use the temperature sensor to continuously measure the temperature of three measuring points: indoor air temperature T0, roof lower surface temperature T1, roof lower surface temperature Relative to the surface temperature T2 of the enclosure structure, and convert it into an electrical signal and transmit it to the controller 204 . Compare the indoor air temperature T0 with two indoor high temperature reference values TH and low temperature reference values TL to judge whether the indoor temperature is too high, too low or moderate, and then compare the roof lower surface temperature T1 with the relative enclosure structure surface temperature under the roof T2 is compared to determine the direction of the radiation heat transfer between the two surfaces at this time. When the temperature T1 of the lower surface of the roof is higher than the surface temperature T2 of the relative enclosure structure under the roof (T1>T2), it means that the radiation heat transfer is from the roof Pass to the room, and vice versa. When the radiation heat transfer direction is from the roof to the room, if the indoor temperature is high at this time, the controller 204 acts to keep the foldable heat-shielding curtain 205 in the unfolded state, and if the indoor temperature is low at this time, the controller 204 acts Keep the foldable heat-shielding curtain 205 in a retracted state; when the radiation heat transfer direction is from the room to the roof, and the indoor temperature is relatively high at this time, the controller 204 acts to keep the foldable heat-shield curtain 205 in a retracted state, If the indoor temperature is low at this time, the controller 204 acts to keep the foldable heat-shielding curtain 205 in an unfolded state;

Example 1, Insulation of a flat roof with a suspended ceiling

Referring to Fig. 5, Fig. 5 is a schematic diagram of this embodiment applied to the heat insulation of a flat roof with a suspended ceiling layer, which includes: a temperature sensor 201 on the lower surface of the roof, and a temperature sensor on the surface of the relative enclosure structure under the roof on the upper surface of the suspended ceiling layer 202, the indoor air temperature sensor 203, the sensors at the above three positions are all connected to the controller 204, the controller 204 receives the output signals of the temperature sensors 201, 202 and 203, and after processing and judging the signals, makes corresponding control instructions, by Its internal drive mechanism drives the drive belt 502 connected to the power output end of the controller 204 to act, and finally realizes the expansion or retraction of the heat-shielding roller blind 205 through the heat-shielding curtain drive shaft 501 connected to the driving belt 502; The surface temperature sensor of the protective structure is located on the upper surface of the suspended ceiling.

The specific working process is: after the temperature sensors 201, 202, 203, the folding heat-shielding curtain 205 and the controller 204 are arranged, firstly, the indoor air high temperature reference value TH and the low temperature reference value TL are set by the controller 204 (TH>TL , TH and TL can be set to 27°C and 20°C, respectively). The temperature sensors 201, 202, 203 continuously measure the temperature T1 of the lower surface of the roof and the temperature T2 of the upper surface of the suspended ceiling as the surface temperature of the relative enclosure structure under the roof and the indoor air temperature T0, and send them to the controller 204. In the controller 204, the indoor air temperature T0 is compared with the high temperature reference value TH and the low temperature reference value TL:

1) When the measured indoor air temperature T0 is greater than the high temperature reference value TH, it means that the indoor air temperature is too high and needs to be cooled down. The comparison result with T2 is performed as follows:

①When T1 is higher than T2 by more than M°C (M can be set to 1°C), the controller 204 acts to drive the belt 502 to rotate, driving the drive shaft 501 of the heat-shielding curtain to rotate counterclockwise, so that the foldable heat-shielding curtain 205 reaches expanded state.

②When T1 is lower than T2 by more than M°C (M can be set to 1°C), the controller 204 acts to drive the belt 502 to rotate, driving the drive shaft 501 of the heat-shielding curtain to rotate clockwise, so that the foldable heat-shielding curtain 205 reaches Collapsed state.

③ When T2-M≤T1≤T2+M (M can be set to 1°C), the controller 204 does not act, and keeps the foldable heat-shielding curtain 205 in its current state.

2) When the measured indoor air temperature T0 is lower than the low temperature reference value TL, it means that the indoor air temperature is low and needs to be heated up. In the controller 204, the temperature T1 of the lower surface of the roof is compared with the temperature T2 of the upper surface of the suspended ceiling, and then according to T1 The comparison result with T2 is performed as follows:

①When T1 is higher than T2 by more than M°C (M can be set to 1°C), the controller 204 acts to drive the belt 502 to rotate, driving the drive shaft 501 of the heat-shielding curtain to rotate clockwise, so that the foldable heat-shielding curtain 205 reaches Collapsed state.

②When T1 is lower than T2 by more than M°C (M can be set to 1°C), the controller 204 acts to drive the reel belt 502 to drive the heat-shielding curtain drive shaft 501 to rotate counterclockwise, so that the foldable heat-shielding curtain 205 reaches expanded state.

③ When T2-M≤T1≤T2+M (M can be set to 1°C), the controller 204 does not act, and keeps the foldable heat-shielding curtain 205 in its current state.

3) When the measured indoor air temperature T0 is between the high temperature reference value TH and the low temperature reference value TL, that is, TL≤T0≤TH, it means that the indoor air temperature is moderate, and the controller 204 does not operate, so that the foldable heat-shielding curtain 205 Maintain the current state.

Through the action of the controller, after the corresponding operation of the folding heat-shielding curtain is completed, the temperatures T0, T1 and T2 are continuously measured, and the next operation is continued as required.

Example 2: Insulation of flat roof without suspended ceiling

Referring to Fig. 6, it is a schematic diagram of this embodiment applied to the heat insulation of a flat roof without a suspended ceiling layer. The figure includes: a temperature sensor 201 on the lower surface of the roof, a temperature sensor 202 on the surface of the relative enclosure structure under the roof on the indoor ground surface, and an indoor temperature sensor 202. Air temperature sensor 203, controller 204, folding heat-shielding curtain 205, heat-shielding curtain driving shaft 501, driving belt 502; the structure and principle are all consistent with embodiment 1, but wherein the relative enclosure structure surface temperature sensor under the roof is located indoors surface.

Referring to FIG. 7 , the heat-shielding curtains in the above two embodiments may use roll-type heat-shielding curtains instead of the above-mentioned foldable heat-shielding curtains.

Claims (4)

1. A roof heat-shielding device, characterized in that it comprises a heat-shielding curtain arranged between the roof of the building and the indoor enclosure structure under the roof, a controller and a temperature sensor, and the temperature sensors are respectively located on the lower surface of the roof, the roof The surface of the lower indoor enclosure structure and the indoor air side are used to measure the indoor air temperature T0, the temperature T1 of the lower surface of the roof, and the surface temperature T2 of the relative enclosure structure under the roof, and all sensors are connected to the input end of the controller to control Two different indoor high temperature reference value TH and low temperature reference value TL are set in the controller, the output end of the controller is connected to the driving belt, and finally the driving belt is connected to the driving shaft of the thermal curtain to control the expansion and retraction of the thermal curtain; and : T0>TH and T1>T2+M; or when T0<TL and T1<T2-M, drive the reel belt to drive the reel of the heat-shielding roller blind to rotate, and the roller blind unfolds; TL≤T0≤TH or T2-M≤T1≤T2+M, the reel does not rotate and maintains the current state of the heat-shielding roller blind; When T0>TH and T1<T2-M; or when T0<TL and T1>T2+M, drive the reel belt to drive the heat-shielding roller blind reel to rotate, and the roller blind is retracted; Where M is the set temperature value. 2. The roof heat-shielding device according to claim 1, wherein the heat-shielding curtain is a foldable heat-shielding curtain, which is composed of a plurality of heat-shielding panels with a certain hardness, and the different heat-shielding panels are softly connected . 3. The roof heat-shielding device according to claim 1, wherein the heat-shielding curtain is a roller-type heat-shielding curtain. 4. The roof heat-shielding device according to any one of claims 1-3, wherein the heat-shielding curtain is made of a material with low emissivity and high reflectivity, and the reflectivity for low-temperature heat radiation reaches above 0.8.

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