JP7151502B2 - Carbon dioxide supply device - Google Patents

Description

The present invention relates to a carbon dioxide supply device.

2. Description of the Related Art Conventionally, in combustion devices, various configurations have been proposed for preventing exhaust gas from flowing into an air supply port. For example, Japanese Utility Model Laying-Open No. 51-17241 (Patent Document 1) discloses a combustion device in which an air supply port is located a certain distance outside an exhaust port. Japanese Utility Model Laid-Open No. 61-141544 (Patent Document 2) and Japanese Utility Model Publication No. 58-18033 (Patent Document 3) disclose a combustion device provided with a plate separating an exhaust port and an air supply port.

Japanese Utility Model Laid-Open No. 51-17241 Japanese Utility Model Laid-Open No. 61-141544 Japanese Utility Model Publication No. 58-18033

In recent years, the combustion device as described above is used as a supply device for carbon dioxide gas (carbon dioxide) discharged from the combustion device. The carbonation device may be connected to other elements for the supply of carbonation. Even when the carbon dioxide gas supply device is connected to other elements, the stability of combustion in the carbon dioxide gas supply device is ensured, and thereby the carbon dioxide gas supply device stably supplies carbon dioxide gas. Technology is in demand.

The present disclosure has been conceived in view of such circumstances, and an object thereof is to provide a technique for stably supplying carbon dioxide by a carbon dioxide supply device.

According to one aspect of the present invention, a housing, an air supply port and an air exhaust port provided on one of a plurality of surfaces of the housing, and an air supply port built in the housing through the air supply port A combustion mechanism that burns fuel using the introduced air, a passage for exhaust from the combustion mechanism formed between the combustion mechanism and the exhaust port inside the housing, and one surface of the housing A carbon dioxide delivery system is provided comprising: a duct hood mounted on the The duct hood includes a connection port to a duct leading to a supply destination of carbon dioxide gas, and an air supply side opening and an exhaust side opening for communicating the internal space of the duct hood with the air supply port and the exhaust port, respectively. The center of the connection port is eccentric with respect to the center of the exhaust side opening.

According to the present invention, the supply and exhaust pressure imbalances are eliminated by communicating the supply and exhaust ports with a common interior space and by avoiding a straight line flow of air from the exhaust port to the connection port. destabilization of combustion in the combustion mechanism is suppressed.

1 is a schematic diagram showing a configuration example of a carbon dioxide supply system to which a carbon dioxide supply device according to the present embodiment is applied; FIG. 1 is a schematic diagram for explaining the internal configuration of a carbon dioxide gas supply device according to the present embodiment; FIG. 2 is an external view showing a configuration example of a duct hood 200; FIG. 4 is a top view of the duct hood 200; FIG. FIG. 4 is a diagram for explaining the direction of flow of carbon dioxide gas from an exhaust-side opening 272 to a connection port 210; FIG. 4 is a diagram for explaining the positional relationship between a connection port 210 and an air supply side opening 271; FIG. 7 is a top view of the duct hood 200 in the example of FIG. 6; FIG. 4 is an external view showing a configuration of a modified example of the duct hood 200; 3 is an external view showing a configuration example of a cover member 300; FIG. FIG. 10 is an external view seen from direction A in FIG. 9 ; 3 is a plan view of a cover member 300; FIG. FIG. 4 is a diagram for explaining the positional relationship between a connection port 211 and an air supply side opening 271 when the carbon dioxide supply device 10 includes a cover member 300;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated in principle.

[1. Configuration of carbon dioxide gas supply system]
FIG. 1 is a schematic diagram showing a configuration example of a carbon dioxide supply system to which a carbon dioxide supply device according to the present embodiment is applied.

Referring to FIG. 1 , carbon dioxide gas supply device 10 includes housing 100 containing a combustion mechanism and the like, and duct hood 200 . Duct hood 200 is provided with connection port 210 with duct 250 . Carbon dioxide supply device 10 is connected to radiator 180 via pipes 181 and 182 .

[2. Configuration of Carbon Dioxide Supply Device]
FIG. 2 is a schematic diagram for explaining the internal configuration of the carbon dioxide supply device according to the present embodiment.

Referring to FIG. 2 , carbon dioxide supply device 10 includes air supply fan 130 , combustion mechanism 140 and heat exchanger 155 built in housing 100 . The carbon dioxide supply device 10 further includes a supply cylinder 110 and an exhaust cylinder 120 provided on one of the plurality of surfaces of the housing 100 . In the present embodiment, the opening formed by the air supply cylinder 110 forms the air supply port 111 , and the opening formed by the exhaust pipe 120 forms the exhaust port 121 .

Air supply fan 130 is arranged near air supply port 111 . The air supply fan 130 incorporates a fan motor (not shown), and is driven to rotate by the fan motor, thereby sucking outside air from the air supply port 111 . Air taken in by the air supply fan 130 is supplied to the combustion mechanism 140 .

Combustion mechanism 140 may typically consist of a burner that burns a fuel (eg, oil, gas) using air drawn in by intake fan 130 . Any device can be used as the combustion mechanism as long as it generates exhaust gas containing carbon dioxide gas (carbon dioxide) by burning fuel.

High-temperature exhaust from combustion mechanism 140 passes through heat exchanger 155 and is output to exhaust passage 170 connected to exhaust port 121 . In the heat exchanger 155, heat exchange between the exhaust gas and the liquid medium 153 increases the temperature of the liquid medium 153 while decreasing the temperature of the exhaust gas.

Liquid medium 153 flows through a circulation path including pipes 181 and 182 and radiator 180 ( FIG. 1 ) in response to operation of circulation pump 160 . As a result, the liquid medium 153 whose temperature has been raised by the heat exchanger 155 is delivered to the radiator 180 through the pipe 181 . The temperature of the liquid medium 153 is lowered by passing through the radiator 180 . The liquid medium 153 whose temperature has been lowered by the radiator 180 is returned to the heat exchanger 155 through the pipe 182 . By arranging the radiator 180 as a radiator for the liquid medium 153 in this way, it is possible to continuously perform the process of lowering the temperature of the exhaust gas by the heat exchanger 155 . It should be noted that it is also possible to dispose a radiator different from the radiator 180. For example, by connecting piping arranged in a greenhouse or the like to the above-mentioned pipes 181 and 182 and the circulation pump 160, It is also possible to use

The exhaust that has passed through the heat exchanger 155 is sent to the exhaust port 121 via the exhaust passage 170 . Even after passing through the heat exchanger 155, the temperature of the exhaust air is higher than the temperature of the outside air. preferable. Air supply port 111 is also provided on the same surface as exhaust port 121 , that is, on top surface 101 . By providing the exhaust port 121 and the air supply port 111 on the top surface 101, the installation area of the carbon dioxide gas supply device 10 can be reduced, which is advantageous when the carbon dioxide gas supply device 10 is installed in a narrow space.

Duct hood 200 is attached to the surface (top surface 101 in FIG. 2) provided with air supply port 111 and exhaust port 121 of housing 100 . The shape of duct hood 200 will be described later with reference to FIG. 3, but duct hood 200 has a plurality of surfaces (top surface 205, side surfaces 206, and bottom surface 207). An upper surface 205 of the duct hood 200 is provided with a connection port 210 to the duct 250 .

Referring to FIG. 1 again, one end of duct 250 is connected to connection port 210 . As a result, the exhaust port 121 of the carbon dioxide supply device 10 communicates with the duct 250 via the internal space of the duct hood 200 .

It is preferable that the duct 250 be provided with a blower fan 255 for sending the carbon dioxide gas to a supply destination such as a greenhouse. The duct 250 is branched into a plurality of output pipes 260 on the downstream side of the blower fan 255 . A plurality of output pipes 260 are arranged in a vinyl house or the like to which carbon dioxide gas is supplied. That is, a carbon dioxide gas supply route is formed from the duct 250 to the supply destination.

By providing a plurality of output pipes 260, a single carbon dioxide supply device 10 can supply carbon dioxide to a plurality of supply destinations. Furthermore, by operating the blower fan 255, each output tube 260 can apply air pressure to supply carbon dioxide gas. It should be noted that the carbon dioxide supply device 10 according to the present embodiment can be similarly applied to a single carbon dioxide supply destination.

[3. Configuration of duct hood]
(overall structure)
FIG. 3 is an external view showing a configuration example of the duct hood 200. As shown in FIG.

Referring to FIG. 3, duct hood 200 has a rectangular parallelepiped shape, for example, and has top surface 205 , side surface 206 and bottom surface 207 . A connection port 210 with a duct 250 is provided on the upper surface 205 . Note that the connection port 210 is also preferably arranged on the upper surface 205 of the duct hood 200 in consideration of the temperature of the exhaust gas output from the exhaust port 121 .

In the rectangular parallelepiped shape, four side surfaces 206 are provided. A vent 209 is formed in each of the side surfaces 206 . When the duct hood 200 is attached, the bottom surface 207 faces the top surface 101 of the housing 100 in which the air supply port 111 and the air exhaust port 121 are formed. A net (not shown) may be attached to each ventilation port 209 to prevent foreign matter from entering. The net can be formed using, for example, a metal (typically stainless steel) mesh plate. A mesh can be attached to the entire surface of the vent 209 .

By attaching duct hood 200 to top surface 101 of housing 100 , duct hood 200 has an internal space that is separated from the outside of duct hood 200 by top surface 205 and side surfaces 206 .

The bottom surface 207 of the duct hood 200 is provided with an air supply side opening 271 and an exhaust side opening 272 for communicating the air supply port 111 and the air exhaust port 121 respectively with the internal space of the duct hood 200 . Accordingly, by attaching the duct hood 200 to the top surface 101 of the housing 100, both the air supply port 111 and the air exhaust port 121 communicate with the common internal space. Thereby, the external pressure acting on the air supply port 111 and the exhaust port 121 is made common.

Note that the entire bottom surface of the duct hood 200 may be an opening. That is, the duct hood 200 does not have to have the bottom surface 207 . In this case, similarly to the embodiment in FIG. 3, the positions occupied by the air supply port 111 and the air exhaust port 121 in the internal space of the duct hood 200 in a state where the duct hood 200 is attached to the top surface 101 of the housing 100. corresponds to the respective positions of the intake side opening 271 and the exhaust side opening 272 in the duct hood 200 .

When the external pressure is imbalanced between inlet 111 and outlet 121, the imbalance in the inlet and outlet pressures causes the pressure inside enclosure 100, particularly at combustion mechanism 140, to be higher than adequate. There is concern that the combustion state may become unstable due to the increase or decrease. In particular, if the duct 250 provided with the blower fan 255 is configured to be connected only to the exhaust tube 120 (exhaust port 121), there is a concern that the imbalance of the external pressure will become significant.

On the other hand, according to the carbon dioxide supply device 10 according to the present embodiment, both the air supply port 111 and the exhaust port 121 are commonly communicated with the internal space of the duct hood 200, so that the combustion mechanism 140 It is possible to realize an air supply/exhaust configuration that suppresses destabilization of combustion.

Further, in the internal space of the duct hood 200 , a mixture of the outside air introduced from the ventilation port 209 and the exhaust air output from the exhaust port 121 can be supplied from the connection port 210 to the duct 250 . As a result, the carbon dioxide supplied from each output pipe 260 via the duct 250 can be prevented from being overheated.

On the other hand, since the air supply port 111 and the exhaust port 121 are arranged on the same surface of the housing 100 (the top surface 101 in FIG. 1), the exhaust air output from the exhaust port 121 is sucked into the air supply port 111. There is concern that Exhaust gas sucked into the air supply port 111 is sent to the combustion mechanism 140 via the air supply fan 130, and there is concern that the combustion state in the combustion mechanism 140 may deteriorate.

In addition, since the air supply port 111 is arranged on the top surface 101 of the housing 100, if moisture such as rainwater splashes on the duct hood 200 or the top surface 101, the water will enter from the air supply port 111, thereby supplying air. There is a concern that components built in the housing 100, such as the fan 130, may fail. The exhaust port 121 is also arranged on the top surface 101 of the housing 100 in the same manner as the air supply port 111, but the exhaust port 121 does not have a component that may be damaged by moisture. Moreover, even if moisture enters, the moisture may be evaporated by the high-temperature exhaust gas. Therefore, it can be said that the influence of moisture entering the exhaust port 121 is small.

(Arrangement of connection port and exhaust side opening)
FIG. 4 is a top view of the duct hood 200. FIG. The positional relationship between the connection port 210 and the exhaust-side opening 272 in the duct hood 200 will be described with reference to FIG. 4 .

In FIG. 4, a point C1 and a diameter D1 represent the center point and radius of the exhaust-side opening 272 on the horizontal plane, respectively. A point C2 and a diameter D2 represent the center point and radius of the connection port 210 on the horizontal plane, respectively. As shown in FIG. 4, the point C2 is located at a different position from the point C1 on the horizontal plane (the XY plane in FIG. 4). That is, the center point of connection port 210 is eccentric with respect to the center point of exhaust-side opening 272 . In the example shown in FIG. 4, the cross-sectional shape of each of the connection port 210, the air supply side opening 271, and the exhaust side opening 272 is circular, but is not limited to this. It can be of any shape, such as elliptical or polygonal.

FIG. 5 is a diagram for explaining the direction of flow of carbon dioxide gas from the exhaust-side opening 272 to the connection port 210. As shown in FIG. In FIG. 5, arrow AR1 represents an example of the flow of carbon dioxide gas. The center point of connection port 210 is eccentric with respect to the center point of exhaust-side opening 272 . Thereby, at least part of the arrow AR1 is inclined with respect to the vertical direction. That is, the direction of the carbon dioxide gas flow from the exhaust-side opening 272 to the connection port 210 is not along the vertical direction, but is inclined with respect to the vertical direction.

When the direction of the carbon dioxide gas flow from the exhaust-side opening 272 to the connection port 210 is inclined with respect to the vertical direction, the carbon dioxide gas discharged from the exhaust-side opening 272 is greater than when the flow is along the vertical direction. tends to be mixed with air within the duct hood 200 before being introduced into the connection port 210 . As a result, it is possible to avoid a situation in which blower fan 255 breaks down due to the supply of high-temperature carbon dioxide gas to duct 250 .

FIG. 6 is a diagram for explaining the positional relationship between the connection port 210 and the air supply side opening 271. As shown in FIG. FIG. 7 is a top view of the duct hood 200 in the example of FIG. FIGS. 6 and 7 show a hypothetical connection port 211 as an example of an opening having a larger diameter than the connection port 210 . The left end of the connection port 210 and the left end of the connection port 211 are at the same position. Right ends 210R and 211R represent right ends of the connection ports 210 and 211, respectively.

A line E1 in FIG. 6 schematically indicates the position of the left end of the air supply side opening 271 . In the horizontal plane, the right end 210R is positioned to the left of the left end of the air supply side opening 271 . That is, the connection port 210 does not overlap the air supply side opening 271 in the horizontal plane (XY plane in FIGS. 4 and 6). As a result, the connection port 210 and the air supply side opening 271 do not share the vertical axis (the Z axis in FIGS. 4 and 6). This prevents the carbon dioxide discharged from the exhaust side opening 272 from being led to the supply side opening 271 when the carbon dioxide gas is introduced from the exhaust side opening 272 to the connection port 210 .

On the other hand, the right end 211R is located on the right side of the left end of the air supply side opening 271 . That is, the connection port 211 overlaps the air supply side opening 271 in the horizontal plane. An arrow AR2 represents a flow assumed when carbon dioxide gas is introduced from the exhaust-side opening 272 to the connection port 211. As shown in FIG. For comparison, FIG. 6 shows the arrow AR1 (the assumed flow when the carbon dioxide gas is introduced from the exhaust-side opening 272 to the connection port 210) shown in FIG.

Compared to arrow AR1, arrow AR2 passes through a location closer to intake side opening 271. As shown in FIG. This increases the possibility that the carbon dioxide gas discharged from the exhaust side opening 272 (exhaust cylinder 120) is sucked into the combustion mechanism 140 via the intake side opening 271 (the intake cylinder 110). In FIG. 6, such a carbon dioxide flow (short cycle) is indicated by an arrow AR3.

Further, when the "connection port 210" is replaced with the "connection port 211", the air to be introduced into the combustion mechanism 140 from the air supply side opening 271 (air supply cylinder 110) is introduced from the connection port 211 into the duct 250. also more likely.

As described above, if the "connection port 210" is replaced with the "connection port 211" in the examples shown in FIGS. performance may decrease. Therefore, in one embodiment, the connection port 210 may be configured so as not to overlap the intake side opening 271 in the horizontal plane.

[4. cover member]
FIG. 8 is an external view showing a configuration of a modified example of duct hood 200. As shown in FIG.

In the example of FIG. 8 , the carbon dioxide supply device 10 further includes a cover member 300 that covers the air supply port 111 . Cover member 300 is arranged in the internal space of duct hood 200 together with air supply port 111 and exhaust port 121 . The cover member 300 is configured to allow external air to be drawn in through the air supply port 111 while suppressing the infiltration of the exhaust air output from the exhaust port 121 and the infiltration of moisture from the outside of the duct hood 200 . The configuration of the cover member 300 will be described in detail below with reference to FIGS. 9 and 10. FIG.

FIG. 9 is an external view showing a configuration example of the cover member 300. As shown in FIG. Note that the illustration of the duct hood 200 is omitted in the external view of FIG. 9 . FIG. 10 is an external view seen from direction A in FIG. 11 is a plan view of the cover member 300. FIG.

Referring to FIGS. 9 and 10, cover member 300 is provided around intake cylinder 110 . Cover member 300 has a top surface 301 and side surfaces 302 and 303 . The cover member 300 is made of, for example, stainless steel.

Upper surface 301 is provided above supply cylinder 110 . As shown in FIG. 10 , upper surface 301 is spaced upward from the end of intake cylinder 110 . As shown in FIG. 11 , the upper surface 301 is arranged so as to overlap the air supply port 111 in a plan view seen from the top surface 101 of the housing 100 . By arranging the upper surface 301 so as to cover the entire surface of the air supply port 111 , it is possible to effectively prevent moisture from entering the air supply port 111 .

In the example of FIG. 9 , the top surface 301 of the cover member 300 is arranged substantially parallel to the top surface 101 of the housing 100 and the bottom surface 207 of the duct hood 200 . However, the upper surface 301 does not necessarily have to be arranged parallel to the top surface 101 and the bottom surface 207 as long as it overlaps the air supply port 111 in plan view.

Side surface 302 is arranged between intake cylinder 110 and exhaust cylinder 120 so as to stand up from top surface 101 . In the example of FIG. 9, the side surface 302 has a rectangular shape and is arranged to extend in the same direction (that is, the vertical direction) as the direction in which the intake cylinder 110 and the exhaust cylinder 120 extend (the vertical direction in FIG. 9). .

Side 303 is attached to side 206 of duct hood 200 . For example, the cover member 300 is fixed to the bottom surface 207 of the duct hood 200 by attaching the side surface 303 to the side surface 206 with a fastening member such as a screw.

By arranging the side surface 302 between the intake cylinder 110 and the exhaust cylinder 120 , it is possible to cut off the path for the exhaust gas output from the exhaust cylinder 120 to reach the intake cylinder 110 . As shown in FIG. 10, the cover member 300 does not have a side surface on the side opposite to the side surface 302 with the intake cylinder 110 interposed therebetween, and is in an open state. With such a configuration, the outside air is led to the air supply cylinder 110 through the opening of the cover member 300 and the gap between the upper surface 301 and the end of the air supply cylinder 110 . That is, outside air is led from the side opposite to the exhaust cylinder 120 toward the intake cylinder 110 . As a result, entry of the exhaust air into the air supply port 111 can be suppressed.

If the distance (corresponding to the length L in the drawing) between the end of the air supply cylinder 110 and the upper surface 301 is narrowed, it becomes difficult for moisture to enter the air supply port 111, but air supply resistance increases. Insufficient supply of air will lead to deterioration of the combustion state. Therefore, it is preferable to set the distance between the end portion of the air supply cylinder 110 and the upper surface 301 through experiments or simulations to an appropriate length that can suppress the increase in air supply resistance while suppressing the infiltration of moisture.

As shown in FIG. 10 , a vent hole 305 is formed in the side surface 302 so as to penetrate the side surface 302 . As a result, outside air introduced into cover member 300 through the opening of cover member 300 is sucked into intake cylinder 110 and flows to the outside of cover member 300 (that is, to the side of exhaust cylinder 120 ) through ventilation port 305 . A path is formed. By providing the ventilation port 305 in the side surface 302 in this way, it is possible to prevent the outside air introduced from the ventilation port 209 of the duct hood 200 toward the supply cylinder 110 from staying inside the cover member 300 . As a result, provision of the cover member 300 can prevent the external pressure balance between the air supply port 111 and the exhaust port 121 from being lost.

Further, even in a situation where the external air led into the cover member 300 contains exhaust air, the exhaust air can be output to the outside of the cover member 300 (exhaust pipe 120 side) from the ventilation openings 305 together with the external air. Therefore, since the exhaust gas does not stay inside the cover member 300 , it is possible to suppress the intake of the exhaust gas into the air supply port 111 .

In addition, it is preferable to form the ventilation port 305 at a position distant from the intake cylinder 110 when viewed from the exhaust cylinder 120 . Specifically, on the side surface 302, it is preferable to form the ventilation port 305 at a position where the distance between the exhaust pipe 120 and the ventilation port 305 is as long as possible. By doing so, it is possible to prevent the exhaust gas output from the exhaust pipe 120 from being directly guided into the cover member 300 through the ventilation port 305 .

Furthermore, it is preferable that the ventilation port 305 is arranged so as not to overlap the intake cylinder 110 when the side surface 302 is viewed from the exhaust cylinder 120 side. In this configuration example, as shown in FIG. 11, when the side surface 302 is viewed from the side of the exhaust pipe 120, the ventilation port 305 is arranged at a position where the opening end of the ventilation port 305 and the side surface of the intake pipe 110 overlap. do not have. As the opening area of the ventilation port 305 increases, the exhaust gas output from the exhaust pipe 120 flows into the cover member 300 through the ventilation port 305 and is easily sucked into the intake pipe 110 . By arranging the ventilation opening 305 so that the intake cylinder 110 and the ventilation opening 305 do not overlap, it is possible to suppress the exhaust gas output from the exhaust cylinder 120 from flowing into the intake cylinder 110 through the ventilation opening 305 as it is.

In addition, the length of the air intake 305 in the direction in which the air supply cylinder 110 extends (that is, the height of the air intake 305) must be equal to or less than the length in the direction in which the air supply cylinder 110 extends (that is, the height of the air supply cylinder 110). is preferred. This is because if the height of the air vent 305 is higher than the height of the air intake cylinder 110, the exhaust gas output from the exhaust cylinder 120 tends to flow directly into the air intake cylinder 110 through the air vent 305.

Referring to FIG. 10 , lid member 112 is attached to the end face of supply cylinder 110 . Lid member 112 is provided to adjust the opening diameter of air supply port 111 . Specifically, referring to FIG. 11, lid member 112 has a disc shape with an open center. Assuming that the opening diameter of the supply cylinder 110 is φB1 and the opening diameter of the lid member 112 is φB2, a relationship of φB1>φB2 is established. Further, when the opening diameter of the end surface of the exhaust pipe 120 is φA, the relationship φA>φB2 holds. That is, by providing lid member 112 , the opening diameter of the end surface of intake cylinder 110 can be made smaller than the opening diameter of the end surface of exhaust cylinder 120 .

By adjusting at least one of the opening diameter of the supply cylinder 110 and the opening diameter of the exhaust cylinder 120 using the lid member 112 in this way, the ventilation resistance inside the housing 100 can be adjusted. In addition, it is preferable to provide the lid member 112 on the end surface of the supply cylinder 110 . The ventilation resistance can also be adjusted by providing the lid member 112 on the end face of the exhaust pipe 120, but if the lid member 112 is provided on the exhaust pipe 120, fluctuations in internal pressure such as during the ignition operation of the combustion mechanism 140 will occur. This is because if the lid member 112 is large, the lid member 112 may act as an exhaust resistance and generate an abnormal noise.

The shape of the exhaust cylinder 120 and the intake cylinder 110 is an example, and it is also possible to adopt a shape other than a cylindrical shape, such as a rectangular parallelepiped shape or an elliptical cylindrical shape. The shape of the cover member 300 is also an example. Also in these cases, a surface (first surface) provided to cover the air supply port 111 above the air supply cylinder 110 and a surface (second surface) standing between the air supply cylinder 110 and the exhaust cylinder 120 ), the same effect can be obtained by providing the cover member 300 so as to have the above.

The mounting surface of the exhaust cylinder 120 and the intake cylinder 110 with respect to the housing 100 can also be a side surface other than the top surface 101 . In this case, the mounting surface of the duct hood 200 to the housing 100 can also be the side surface. By arranging the blower fan 255 in the duct 250, even if the exhaust pipe 120, the supply pipe 110 and the duct hood 200 are attached to the side surface of the housing 100, air containing carbon dioxide gas is sucked from the connection port 210. It can be supplied to a vinyl house or the like.

FIG. 12 is a diagram for explaining the positional relationship between the connection port 211 and the air supply side opening 271 when the carbon dioxide gas supply device 10 includes the cover member 300. As shown in FIG.

As shown in FIG. 12, the cover member 300 can suppress the short cycle (arrow AR3 in FIG. 6) and the introduction of the air to the combustion mechanism 140 from the intake side opening 271 into the duct 250. . That is, even if the connection port 211 overlaps the intake-side opening 271 in the horizontal plane, the cover member 300 can suppress the decrease in the combustibility of the combustion mechanism 140 that is assumed thereby.

Each embodiment disclosed this time should be considered as an illustration and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims. In addition, the inventions described in the embodiments and modifications are intended to be implemented either singly or in combination as much as possible.

10 carbon dioxide supply device 100 housing 101 top surface 110 air supply pipe 111 air supply port 112 lid member 120 exhaust pipe 121 exhaust port 130 air supply fan 140 combustion mechanism 153 liquid medium 155 heat exchanger, 160 circulation pump, 170 exhaust passage, 180 radiator, 181,182 piping, 200 duct hood, 205,301 upper surface, 206,302,303 side surface, 207 bottom surface, 209,305 ventilation port, 210,211 connection port, 250 duct, 255 blower fan, 260 output pipe, 271 air supply side opening, 272 exhaust side opening, 300 cover member.

Claims (3)

a housing;
an air supply port and an exhaust port provided on one of the plurality of surfaces of the housing;
a combustion mechanism that is built in the housing and burns fuel using the air introduced through the air supply port;
a passage for exhaust from the combustion mechanism formed between the combustion mechanism and the exhaust port inside the housing;
a duct hood attached to the one surface of the housing;
The duct hood is
a connection port with a duct leading to a carbon dioxide supply destination;
including an air supply side opening and an exhaust side opening for communicating the internal space of the duct hood with the air supply port and the exhaust port, respectively;
The carbon dioxide supply device, wherein the center of the connection port is eccentric with respect to the center of the exhaust-side opening. 2. The carbon dioxide supply device according to claim 1, wherein said connection port does not overlap with said air supply side opening. The duct hood is
3. The carbon dioxide supply device according to claim 1, further comprising a cover member provided between said air supply side opening and said connection port and covering said air supply side opening.

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