JP7172573B2 - CO2 supply and duct hood - Google Patents

Description

TECHNICAL FIELD The present invention relates to a CO ₂ supply device for supplying CO ₂ into a cultivation room such as a greenhouse or a vinyl house, and a duct hood.

Conventionally, in a CO ₂ supply device that supplies CO ₂ into a cultivation room such as a greenhouse or a vinyl house, after cooling the high-temperature combustion gas containing CO ₂ generated by the combustion of the combustor to lower its temperature, There is known one in which the waste is discharged into the cultivation room. An example of such a _CO2 supply device is described, for example, in US Pat.

In the CO ₂ supply device (agricultural heat storage system) described in Patent Document 1, a heat exchanger is provided in a duct for flowing combustion gas toward the inside of a house (cultivation room). The combustion gases are cooled by heat exchange with a low temperature heat transfer medium through a heat exchanger.

JP 2017-023056 A

As a CO ₂ supply device for supplying cooled combustion gas into the cultivation chamber as described above, for example, the following configuration can be adopted.

That is, an exhaust port is provided on the top surface of the housing in which the combustor is arranged, and the combustion gas generated by the combustor is discharged from the exhaust port. A duct hood is arranged on the top surface of the housing so as to cover the exhaust port, and the duct hood is provided with an outlet for combustion gas in the top wall and openings in a plurality of side walls. A supply duct for guiding combustion gas into the cultivation chamber is connected to the outlet of the duct hood. A supply fan is provided in the supply duct.

When the supply fan operates, the combustion gas discharged from the exhaust port is mixed with the air taken from the opening and taken into the supply duct. Combustion gases are cooled by being mixed with air.

In such a configuration, the intake port for taking in the air supplied to the combustor should be provided on the top surface of the housing and covered with a duct hood like the exhaust port. can be considered. With this arrangement, even if the airflow volume of the supply fan changes for some reason and the pressure inside the duct hood changes, the air supply port and the exhaust port are arranged in the same duct hood, so that the air supply and exhaust air can be The pressure balance between is not disturbed and is kept almost constant. Therefore, even if the amount of air blown by the supply fan changes, the amount of combustion in the combustor is less likely to vary.

When the air supply port and the exhaust port are arranged in the duct hood in this way, if the supply fan malfunctions and the air flow rate of the supply fan decreases, the combustion gas that can be drawn into the supply duct decrease in the amount of Therefore, part of the combustion gas discharged from the exhaust port leaks out from the opening. On the other hand, the air intake takes in the air supplied to the combustor, as described above. Therefore, part of the combustion gas that has flowed toward the opening on the air supply port side may be drawn into the air supply port. As a result, poor combustion may occur in the combustor, and carbon monoxide, soot, and the like may be generated.

Therefore, an object of the present invention is to provide a CO ₂ supply device and a duct hood that do not cause poor combustion in the combustor even if a fan for sending combustion gas containing CO ₂ into the cultivation chamber malfunctions. intended to

A main aspect of the present invention relates to a _CO2 supply device for supplying _CO2 into a cultivation chamber. The CO ₂ supply device according to this aspect includes a combustor arranged in a housing for generating combustion gas containing CO ₂ , an air supply port and an exhaust port provided on the top surface of the housing, and the air supply. an air supply duct for taking air into the combustor through a port; an exhaust duct for guiding the combustion gas to the exhaust port; and a ceiling of the housing so as to cover the air supply port and the exhaust port. a duct hood arranged on the surface; a supply duct attached to the combustion gas outlet provided on the ceiling wall of the duct hood and guiding the combustion gas into the cultivation chamber; and supplying the combustion gas to the supply duct. a supply fan for intake. Each of the plurality of side walls of the duct hood is provided with an opening for taking air into the duct hood, and the opening is provided in the side wall closest to the air supply port among the plurality of side walls. The part opens closer to the top wall than the openings provided in the other side walls.

If the supply fan malfunctions and combustion gas leaks from the opening, the combustion gas that flows toward the air supply port passes above the air supply port and reaches the opening near the air supply port. leak out of the part. On the other hand, the air inlet continues to take in air from the duct hood through the opening even if the supply fan fails. Therefore, the combustion gas that has flowed toward the air inlet may be drawn into the air inlet like air. The combustion gas flows through the exhaust duct while being pushed by the combustion gas generated one after another by the combustor, and thus is discharged from the exhaust port with a certain force. Therefore, the combustion gas discharged from the exhaust port tends to flow upward inside the duct hood.

In this embodiment, the opening provided in the side wall closest to the air supply port opens closer to the ceiling wall than the openings provided in the other side walls, that is, opens higher than the other openings. . For this reason, the combustion gas that has flowed toward the air supply port flows upward as a whole compared to the case where it flows to other openings. It leaks out through the openings provided. Therefore, intake of combustion gas into the air supply port can be suppressed. As a result, it is possible to reduce the risk of poor combustion occurring in the combustor and the generation of carbon monoxide, soot, and the like.

If all the side walls had openings close to the top wall, the effect of rectifying the combustion gas would be reduced, so even if the supply fan was operating normally, the combustion gas would leak out of the openings. There is concern that In this regard, in the above configuration, the opening is brought close to the top wall of the duct hood only in the side wall closest to the air supply port, so when the supply fan is operating normally, the combustion gas will not flow out of the duct hood. can be suppressed, and the combustion gas can be smoothly guided to the supply duct.

In the CO ₂ supply device according to this aspect, in the inner wall surface above the opening of the side wall closest to the exhaust port among the plurality of side walls, the air pressure is higher than the exhaust port in a direction along the inner wall surface horizontally. A temperature sensor for measuring the temperature of the combustion gas may be provided at a position on the inlet side.

When the supply fan malfunctions and the suction force to the supply duct decreases, part of the combustion gas discharged from the exhaust port tends to flow upward along the side wall closest to the exhaust port. The temperature of the combustion gas at this time is relatively high because it is difficult to mix with the outside air. In addition, the combustion gas flowing upward along the side wall tends to be drawn toward the side of the air supply port due to the influence of the intake of air by the air supply port.

In the above configuration, the temperature sensor is provided on the inner wall surface above the opening of the side wall closest to the exhaust port, at a position closer to the air supply port than the exhaust port in the horizontal direction along the inner wall surface. The temperature sensor can satisfactorily measure the temperature of the combustion gas, which is higher than the normal temperature when the supply fan malfunctions. Therefore, the malfunction of the supply fan can be detected satisfactorily using the temperature sensor.

The CO ₂ supply device according to this aspect may further include a control unit. The controller may be configured to stop the operation of the combustor when the temperature of the combustion gas measured by the temperature sensor exceeds a predetermined value.

When the temperature sensor detects a temperature exceeding a predetermined value, combustion gas is drawn into the air supply port in the duct hood, and abnormal gases such as carbon monoxide and soot are generated by the combustor. There is fear. In this respect, according to the above configuration, the operation of the combustor can be stopped before the combustor performs abnormal combustion. Therefore, it is possible to prevent the combustor from causing poor combustion.

The CO ₂ supply device according to this aspect may be configured such that a breathable cover member is fitted in the opening.

According to the above configuration, when air flows into the duct hood, the cover member can remove, for example, dirt and dust in the air. It also prevents insects and the like from entering the duct hood.

In the CO ₂ supply device according to this aspect, the opening provided in the side wall closest to the air supply port among the side walls is provided in at least one of the side walls other than the side wall closest to the air supply port. It may be constructed such that it has the same size as other openings provided therein and is provided at a higher position from the top surface of the housing than the other openings.

According to the above configuration, the opening closest to the top wall and the openings other than this opening have different height positions from the top surface of the housing to the corresponding side walls. are arranged in the same manner, but the size of the opening is the same. Therefore, when a cover member such as a net or a filter is provided for each opening, the same cover member can be used, which can contribute to cost reduction of the CO ₂ supply device.

A second aspect of the present invention relates to a duct hood provided in a CO ₂ supply device that supplies CO ₂ into the cultivation chamber . The CO ₂ supply device is arranged in a housing and includes a combustor that generates combustion gas containing CO ₂ , an air supply port and an exhaust port provided on the top surface of the housing, and through the air supply port. An air supply duct for taking air into the combustor, an exhaust duct for guiding the combustion gas to the exhaust port, and an outlet for the combustion gas provided on the ceiling wall of the duct hood, a supply duct for directing the combustion gas to and a supply fan for drawing the combustion gas into the supply duct. The duct hood is arranged on the top surface of the housing so as to cover the air supply port and the exhaust port, and each of a plurality of side walls of the duct hood is provided with an air intake for taking air into the duct hood. An opening is provided, and of the plurality of side walls, the opening provided in the side wall closest to the air supply port is closer to the ceiling wall than the openings provided in the other side walls. do.

According to said structure, there can exist an effect similar to a said 1st aspect.

A third aspect of the present invention relates to a _CO2 supply device for supplying _CO2 into the cultivation chamber. The CO ₂ supply device according to this aspect includes a combustor arranged in a housing for generating combustion gas containing CO ₂ , an air supply port and an exhaust port provided on the top surface of the housing, and the air supply. an air supply duct for taking air into the combustor through a port; an exhaust duct for guiding the combustion gas to the exhaust port; and a ceiling of the housing so as to cover the air supply port and the exhaust port. A duct hood arranged on the surface, and a combustion gas outlet provided on the ceiling wall of the duct hood and having a supply duct for guiding the combustion gas taken in by a supply fan into the cultivation chamber. And prepare. Each of the plurality of side walls of the duct hood is provided with an opening for taking air into the duct hood, and the opening is provided in the side wall closest to the air supply port among the plurality of side walls. The part opens closer to the top wall than the openings provided in the other side walls.

According to said structure, there can exist an effect similar to a said 1st aspect.

As described above, the present invention provides a CO ₂ supply device and a duct hood that do not cause poor combustion in the combustor even if the fan for sending combustion gas containing CO ₂ into the cultivation chamber malfunctions. can do.

The effects and significance of the present invention will become clearer from the description of the embodiments shown below. However, the embodiment shown below is merely one example of the implementation of the present invention, and the present invention is not limited to the embodiments described below.

FIG. 1 is a diagram schematically showing a cultivation room in which a CO ₂ supply device according to an embodiment is installed. FIG. 2 is a diagram showing the configuration of the CO ₂ supply device according to the embodiment. FIG. 3 is a block diagram showing the configuration of the CO ₂ supply device according to the embodiment. Fig.4 (a) is a perspective view which shows the structure of the duct hood based on embodiment. FIG. 4(b) is a partially exploded perspective view of the duct hood shown in FIG. 4(a). FIG. 4(c) is a plan view of the duct hood with the top wall removed. FIGS. 5A and 5B are schematic diagrams for explaining the flow of air and combustion gas within the duct hood according to the embodiment. FIG. 5(a) shows a case where the supply fan is operating normally, and FIG. 5(b) shows a case where the supply fan is malfunctioning for some reason. FIG. 6 is a flowchart showing control processing on the radiator side by the control unit according to the embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In addition, in the present embodiment, the control unit 401 and the control unit 501 constitute a “control unit” described in the scope of claims. In each figure, X-, Y-, and Z-axes that are orthogonal to each other are added for convenience. The XY plane is parallel to the horizontal plane and the Z-axis direction is vertical. The Z-axis positive side is upward and the Z-axis negative side is downward.

However, the above description is only for the purpose of associating the structure of the scope of claims with the structure of the embodiment, and the above correspondence allows the invention described in the scope of claims to correspond to the structure of the embodiment. It is not limited at all.

FIG. 1 is a diagram schematically showing a cultivation room 2 in which a CO ₂ supply device 1 is installed.

The CO ₂ supply device 1 is installed in a cultivation room 2 such as a greenhouse or a vinyl house, and supplies CO ₂ (carbon dioxide) to plants such as crops grown in the cultivation room 2 to promote photosynthesis of the plants. The CO ₂ supply device 1 includes a combustion heat source device 10 and an air-cooled radiator 20 . The heat source machine 10 is installed inside the cultivation room 2, and the radiator 20 is installed outside the cultivation room 2, that is, outdoors. The heat source machine 10 has a supply duct 220 extending close to the plant, and the supply duct 220 guides CO ₂ close to the plant. In addition, in the example of FIG. 1, the cultivation room 2 is not divided into a room in which plants are grown and a room in which the heat source device 10 is installed. However, the cultivation room 2 may be divided into the above two rooms. In this case, the supply duct 220 extends from the room in which the heat source machine 10 is installed to the room in which the plants are grown.

FIG. 2 is a diagram showing the configuration of the CO ₂ supply device 1. As shown in FIG.

The heat source device 10 includes a heat source device body 11 and a duct unit 12 .

A can body 101 is arranged in a housing 100 of the heat source device main body 11 . A combustor 102 and a first heat exchanger 103 are accommodated in the can body 101 . A supply pipe 104 is connected to the combustor 102 . The supply pipe 104 extends out of the can body 101 and the housing 100 and is connected to a fuel tank (not shown) in which fuel such as kerosene is stored. A supply pump 105 is provided in the supply pipe 104 . Also, the combustor 102 is provided with a vaporization heater 106 and an igniter 107 .

The first heat exchanger 103 is provided downstream (below) the combustor 102 . A feed pipe 108 and a return pipe 109 are connected to the first heat exchanger 103 . The forward pipe 108 and the return pipe 109 extend outside the can body 101 and housing 100 toward the radiator 20 side. A circulation pump 110 is provided in the return pipe 109 .

A combustion fan 114 is connected to the upper portion of the can body 101 via a communication port 101a. Combustion fan 114 includes casing 115 , fan 116 disposed within casing 115 , and motor 117 that rotates fan 116 . An air supply duct 118 leading to the outside is connected to the casing 115 , and an air supply port 118 a of the air supply duct 118 protrudes from the top surface 100 a of the housing 100 .

An exhaust duct 119 is connected to the lower portion of the can body 101 via the communication port 101b. Exhaust duct 119 extends upward after being folded back at the bottom inside housing 100 , and exhaust port 119 a protrudes from top surface 100 a of housing 100 .

The duct unit 12 includes a duct hood 210 and a supply duct 220 (see FIGS. 4(a) and 4(b)). The shape of the duct hood 210 is a box shape. The duct hood 210 is composed of a bottom base 211, a top wall 212, and four side walls 213a to 213d. The base 211 is provided with holes through which the air supply port 118a and the exhaust port 119a pass. The air supply port 118 a and the air exhaust port 119 a are passed through holes in the base 211 and provided on the top surface 100 a of the housing 100 via the base 211 . The air supply port 118a and the exhaust port 119a open upward. Also, the air supply port 118a and the air exhaust port 119a are covered with the ceiling wall 212 and the side walls 213a to 213d.

Side walls 213a-213d are provided with openings 214a-214d, respectively, for taking air into duct hood 210. As shown in FIG. The air taken into the duct hood 210 through the openings 214a to 214d is used for secondary cooling of the combustion gas discharged from the exhaust port 119a. It is also used to generate combustion gas by combustor 102 .

Further, a temperature sensor 215 capable of measuring the temperature of gas in a high temperature state is provided on the inner wall of a predetermined side wall among the side walls 213 a to 213 d of the duct hood 210 . Note that the base 211, the side walls 213a and 213c, and the openings 214a and 214c are not shown in FIG. to explain. The temperature sensor 215 is also illustrated in FIGS. 5(a) and 5(b).

The supply duct 220 has a supply fan 221 in its middle. Supply fan 221 includes fan 222 and motor 223 that rotates fan 222 . Also, the supply duct 220 is formed with a plurality of outlets 224 at positions corresponding to the plants in the cultivation chamber 2 .

The radiator 20 includes a second heat exchanger 301 and a cooling fan 302 for cooling the second heat exchanger 301 inside the housing 300 . A forward pipe 108 and a return pipe 109 extending from the heat source equipment 10 side are connected to the second heat exchanger 301 . Cooling fan 302 includes a casing 303 , a fan 304 arranged within casing 303 , and a motor 305 that rotates fan 304 .

The CO ₂ supply device 1 performs a CO ₂ supply operation. In the CO ₂ supply operation, in the heat source device 10 , the combustion fan 114 operates, and air taken in from the outside through the air supply duct 118 is supplied to the combustor 102 inside the can body 101 . Combustor 102 is supplied with fuel from a fuel tank through supply pipe 104 by operation of supply pump 105 . When the supplied fuel is vaporized by the vaporization heater 106 and ignited by the igniter 107, the combustor 102 is ignited and burned. Combustion in combustor 102 produces hot combustion gases containing _CO2 .

The combustion gas flows downward inside the can body 101 and is primarily cooled when passing through the first heat exchanger 103 . Specifically, the circulation pump 110 operates, and water circulates between the first heat exchanger 103 , the feed pipe 108 , the second heat exchanger 301 on the radiator 20 side, and the return pipe 109 . Heat is exchanged between the combustion gas passing through the first heat exchanger 103 and the water flowing through the first heat exchanger 103 to cool the combustion gas. The cooled combustion gas flows through the exhaust duct 119 and is discharged into the duct hood 210 through the exhaust port 119a.

Combustion gases discharged into duct hood 210 undergo secondary cooling before entering supply duct 220 . Specifically, the temperature of the combustion gas is further lowered by mixing with the air that has flowed into the duct hood 210 through the openings 214a to 214d provided in the side walls 213a to 213d. The combustion gas whose temperature has been lowered flows into the supply duct 220 from the outlet 210a provided on the ceiling wall 212 of the duct hood 210, and is discharged from the outlet 224 around the plants. This supplies the plants with the _CO2 contained in the combustion gases. At this time, since the supply fan 221 operates in the supply duct 220 , the combustion gas discharged into the duct hood 210 is easily taken into the supply duct 220 and easily discharged from the discharge port 224 .

In addition, a plurality of ridges are provided in the cultivation chamber 2, and plants can be planted on each ridge. Therefore, it is preferable that the supply duct 220 branches into a plurality of ducts, and the branched ducts are arranged in each ridge so that the CO ₂ spreads over the plants in each ridge. In this case, the supply fan 221 is provided on the upstream side (duct hood 210 side) of the branch position in the supply duct 220, and the branched duct is formed with the discharge port 224. As shown in FIG.

In the radiator 20 , the water that has been warmed by heat exchange with the combustion gas and has flowed through the feed pipe 108 flows into the second heat exchanger 301 . Cooling fan 302 operates to send cooling air to second heat exchanger 301 . Heat is exchanged between the water flowing through the second heat exchanger 301 and the cooling air to cool the water. The cooled water returns to the heat source equipment 10 through the return pipe 109 .

As described above, in the CO ₂ supply device 1 , the combustion gas cooled in the heat source device 10 , that is, CO ₂ is released into the cultivation room 2 , so that the inside of the cultivation room 2 does not easily become hot.

FIG. 3 is a block diagram showing the configuration of the CO ₂ supply device 1. As shown in FIG.

In addition to the configuration shown in FIG. A drive unit 407 and a supply fan drive unit 408 are provided.

The control unit 401 includes an arithmetic circuit such as a CPU (Central Processing Unit). A temperature signal based on the temperature of the combustion gas detected by the temperature sensor 215 is input to the controller 401 . Control unit 401 operates combustion fan drive unit 403, supply pump drive unit 404, heater drive unit 405, igniter drive unit 406, circulation pump drive unit 407, and supply fan drive unit 408 according to a program stored in storage unit 402. Control. The storage unit 402 includes a storage medium such as a ROM (Read Only Memory), a RAM (Random Access Memory), a hard disk, or the like, stores a control program for the control unit 401, and stores a work area during control processing of the control unit 401. used as

Combustion fan driving section 403 drives combustion fan 114 (motor 117 ) according to a control signal from control section 401 . The supply pump driving section 404 drives the supply pump 105 according to the control signal from the control section 401 . A heater driving unit 405 drives the vaporization heater 106 according to a control signal from the control unit 401 . The igniter driving section 406 drives the igniter 107 according to the control signal from the control section 401 . Circulation pump driving section 407 drives circulation pump 110 according to the control signal from control section 401 . The supply fan driving section 408 drives the supply fan 221 according to the control signal from the control section 401 .

The radiator 20 includes a control section 501, a storage section 502, and a fan driving section 503 in addition to the configuration shown in FIG.

The control unit 501 includes an arithmetic circuit such as a CPU (Central Processing Unit). Control unit 501 controls fan drive unit 503 according to a program stored in storage unit 502 . The storage unit 502 includes a storage medium such as a ROM (Read Only Memory), a RAM (Random Access Memory), a hard disk, or the like, stores a control program for the control unit 501, and stores a work area when the control processing of the control unit 501 is performed. used as

Fan drive section 503 drives cooling fan 302 (motor 305 ) according to a control signal from control section 501 . For example, fan driver 503 adjusts the current supplied to motor 305 .

In the CO ₂ supply device 1 , the control unit 401 of the heat source device 10 and the control unit 501 of the radiator 20 cooperate to execute control processing related to the CO ₂ supply operation. Therefore, it can be said that the control unit 401 and the control unit 501 constitute one control unit regarding the CO ₂ supply operation.

FIG. 4(a) is a perspective view showing the configuration of the duct hood 210. FIG. FIG. 4(b) is a partially exploded perspective view of the duct hood 210 shown in FIG. 4(a). FIG. 4(c) is a plan view of the duct hood 210 with the top wall 212 removed.

As shown in FIGS. 4(a) and 4(b), the duct hood 210 has a rectangular box shape, and is larger in the Y-axis direction than in the X-axis direction in plan view. The duct hood 210 is composed of a base 211, a ceiling wall 212, and four side walls 213a to 213d, each of which is rectangular. Square-shaped openings 214a to 214d are provided in the side walls 213a to 213d, respectively.

A rectangular frame 217 holding an air-permeable cover member 216 is fitted in each of the openings 214a to 214d, and the frame 217 and side walls 213a to 213d are fixed with screws or the like. By providing the cover member 216 over the openings 214a to 214d, it is possible to remove dirt, dust, etc. from the air flowing into the duct hood 210 through the openings 214a to 214d. Also, it prevents insects and the like from entering the duct hood 210 . In FIGS. 4A and 4B, for convenience of explanation, the cover member 216 has a large mesh, but a smaller mesh can be used. Also, for the cover member 216, for example, a filter, a net, or the like can be used.

Further, among the four openings 214a to 214d, the openings 214a and 214c facing each other in the X-axis direction, and the openings 214b and 214d facing each other in the Y-axis direction are different in shape and area. designed to be identical.

As shown in FIG. 4C, the base 211 has a cylindrical air supply port 118a and a cylindrical air discharge port 119a arranged side by side in the Y-axis direction, which is the longitudinal direction. In the X-axis direction, the air supply port 118a is located closer to the side wall 213a than the center, and the exhaust port 119a is located closer to the side wall 213c than the center. That is, the air supply port and the air exhaust port are in a state of being displaced in the X-axis direction. 4(c), the outlet 210a connected to the supply duct 220 in the ceiling wall 212 is located at the center position in the X-axis direction, and is closer to the center in the Y-axis direction than the center in the Y-axis direction. It is provided at a position on the exhaust port 119a side. At least a portion of the outlet 210a overlaps the opening of the exhaust port 119a in the Z-axis direction (vertical direction). On the other hand, the outlet 210a does not overlap the opening of the air supply port 118a.

As shown in FIGS. 4(a), (b) and FIGS. 5(a), (b), among the side walls 213a to 213d, the opening 214a of the side wall 213a has a height position corresponding to that of the facing side wall 213c. By shifting upward with respect to the height position of the opening 214c, the opening extends closer to the top wall 212 (closer to the top wall 212) than the openings 214b to 214d provided in the other side walls 213b to 213d, respectively. is doing. Side wall 213a is the side wall closest to inlet 118a, as shown in FIG. 4(c). The reason why the opening 214a is provided in the side wall 213a so as to extend toward the ceiling wall 212 from the openings 214b to 214d will be described with reference to FIGS. .

5A and 5B are schematic diagrams for explaining the flow of air and combustion gas within the duct hood 210. FIG. 5A shows the case where the supply fan 221 is operating normally, and FIG. 5B shows the case where the supply fan 221 is malfunctioning. Here, "when the supply fan 221 is operating normally" means a state in which the supply fan 221 is operating at a blowing volume set so that the combustion gas can be taken into the supply duct 220 without delay. “If there is a problem with the supply fan 221 ” means a state in which the amount of air blown by the supply fan 221 is reduced and it becomes difficult for the supply duct 220 to take in the combustion gas. In FIGS. 5(a) and 5(b), the flow of air is indicated by solid-line arrows, and the flow of combustion gas is indicated by broken-line arrows. In addition, in FIGS. 5A and 5B, the ranges of the openings 214a and 214c are surrounded by dashed lines for convenience.

When the amount of combustion by the combustor 102 is constant and the supply fan 221 is operating normally, the combustion gas generated by the combustor 102 flows through the exhaust duct 119 at a predetermined flow rate and is discharged from the exhaust port 119a. Then, the air is mixed with the air taken in from the four openings 214 a to 214 d in the duct hood 210 to be secondary cooled and flows to the supply duct 220 . Since the combustion gas is discharged from the exhaust port 119 a while maintaining the momentum when flowing through the exhaust duct 119 , the combustion gas tends to flow upwards of the duct hood 210 . Therefore, as shown in FIG. 5A, when the supply fan 221 is operating normally, the combustion gas discharged from the exhaust port 119a smoothly flows into the supply duct 220. As shown in FIG.

The air inlet 118a takes in the air that has flowed into the duct hood 210 from the openings 214a to 214d, particularly the opening 214a closest to the air inlet 118a.

Thus, when the supply fan 221 is operating normally, the combustion gases flow smoothly into the supply duct 220, and the air inlet 118a takes in the air necessary for generating the combustion gases.

On the other hand, if the supply fan 221 fails for some reason, as shown in FIG. 5(b), the flow of air and combustion gas differs from that shown in FIG. 5(a).

First, even if the supply fan 221 fails, a certain amount of combustion gas is generated by the combustor 102, and the combustion gas passes through the exhaust duct 119 and is discharged to the duct hood 210 from the exhaust port 119a. However, since the supply fan 221 is blowing less air, the exhausted combustion gas cannot be taken into the supply duct 220, and part of the combustion gas leaks out from the openings 214a to 214d.

On the other hand, the air supply port 118a continues to take in the air that has flowed into the duct hood 210 in order to supply air to the combustor 102 even when the supply fan 221 malfunctions. As described above, the combustion gas discharged from the exhaust port 119a tends to flow upward.

In the present embodiment, in side wall 213a, opening 214a extends higher than other openings 214b to 214d. Therefore, the combustion gas that has flowed toward the side wall 213a passes above the air supply port 118a and easily flows out of the duct hood 210 through the opening 214a. As a result, the combustion gas that has flowed toward the side wall 213a can be prevented from being taken into the air supply port 118a in the same manner as the air.

Further, as shown in FIGS. 5A and 5B, on the inner wall surface above the opening 214b of the side wall 213b closest to the exhaust port 119a among the four side walls 213a to 213d, A temperature sensor 215 is provided at a position closer to the air supply port 118a than the exhaust port 119a in the direction (X-axis direction).

When the supply fan 221 malfunctions and the suction force to the supply duct 220 decreases, part of the combustion gas discharged from the exhaust port 119a tends to flow upward along the side wall 213b closest to the exhaust port 119a. Become. The combustion gas at this time is relatively high in temperature because it is difficult to mix with the outside air (hard to be secondary cooled). Also, the combustion gas flowing upward along the side wall 213b is affected by the intake of air by the air supply port 118a, and tends to be drawn toward the air supply port 118a in the X-axis direction.

As described above, the temperature sensor 215 is provided on the inner wall surface above the opening 214b of the side wall 213b closest to the exhaust port 119a, at a position closer to the air supply port 118a than the exhaust port 119a in the X-axis direction. . Therefore, when the supply fan 221 malfunctions, the temperature sensor 215 can measure the temperature of the combustion gas, which is higher than the normal temperature. Therefore, the malfunction of the supply fan 221 can be detected satisfactorily using the temperature sensor 215 .

FIG. 6 is a flowchart showing control processing related to the CO ₂ supply operation on the heat source device 10 side by the control unit 401 . In FIG. 6, "start" is the time point at which the CO ₂ supply operation is started by operating an operation start button (not shown) provided on the CO ₂ supply device 1 . When the CO ₂ supply operation is started, control unit 401 operates combustion fan 114 and circulation pump 110 to generate CO ₂ . Further, the control unit 401 ignites the combustor 102 by operating the supply pump 105, the vaporization heater 106, and the igniter 107, and operates the supply fan 221 (S101). As described above, combustion gas containing CO ₂ is generated in the heat source device main body 11, and after the combustion gas is cooled, it is discharged into the cultivation chamber 2 from the supply duct 220, and the plants in the cultivation chamber 2 are supplied with CO ₂ . supplied. Next, the controller determines whether or not the temperature detected by the temperature sensor 215 has exceeded a predetermined temperature (S102). At the beginning of operation, the detected temperature does not exceed the predetermined temperature (S102: NO). Therefore, the control unit 401 monitors the temperature detected by the temperature sensor 215 until there is an operation to end the CO ₂ supply operation (S103: NO).

As described above, when the supply fan 221 malfunctions, the combustion gas having a higher temperature than in normal times tends to flow past the position of the temperature sensor, so the temperature detected by the temperature sensor 215 exceeds the predetermined temperature. In step S102, if the detected temperature exceeds the predetermined value (S102: YES), it can be determined that the supply fan 221 is malfunctioning for some reason. Therefore, the control unit 401 stops the combustion fan 114, the circulation pump 110, the combustor 102 and the supply fan 221 in order to stop the CO ₂ supply operation (S104). As a result, generation of carbon monoxide, soot, and the like due to poor combustion in the combustor 102 can be prevented.

Further, when there is a termination operation during the CO ₂ supply operation (S103: YES), the control unit 401 stops the combustion fan 114, the circulation pump 110, the combustor 102 and the supply fan 221 ₍ S104). Supply operation ends.

<Effect of Embodiment>
According to this embodiment, the following effects can be obtained.

As shown in FIGS. 4(a) to (c) and FIG. 5(b), the opening 214a provided in the side wall 213a closest to the air supply port 118a is provided in the other side walls 213b to 213d. It is configured to open closer to the ceiling wall 212 than the openings 214b to 214d. In addition, when the combustion gas is discharged from the exhaust port 119a by the momentum flowing through the exhaust duct 119, it tends to flow upward in the duct hood 210. As shown in FIG. Therefore, if the supply fan 221 malfunctions, of the combustion gas that is not taken into the supply duct 220, the combustion gas that flows toward the side wall 213a closest to the air supply port 118a It passes above and flows out of the duct hood 210 through the opening 214a. As a result, the intake port 118a is less likely to draw combustion gas. Therefore, the amount of combustion gas taken into the air supply port 118a can be suppressed. As a result, it is possible to reduce the risk of poor combustion occurring in the combustor and the generation of carbon monoxide, soot, and the like.

Here, as described above, when the supply fan 221 is operating normally, the combustion gas discharged from the exhaust port 119 a tends to flow upward inside the duct hood 210 . Therefore, not only the opening 214a closest to the air supply port 118a, but also the openings 214b to 214d are drawn into the air supply port 118a if openings are provided in the side walls 213b to 213d so as to approach the top wall 212 side. It is believed that the amount of combustion gas can be further suppressed.

If the openings 214a to 214d provided in all the side walls 213a to 213d are provided so as to open near the ceiling wall 212, the combustion gas rectifying effect is reduced. As a result, even when the supply fan 221 is operating normally, combustion gas leaks out from the openings 214a to 214d. In this case, since the amount of combustion gas flowing into the supply duct 220 is reduced, it is difficult to stably supply the CO ₂ gas necessary for plant growth into the cultivation chamber 2 .

In contrast, in the present embodiment, as shown in FIGS. 5A and 5B, only the opening 214a of the side wall 213a closest to the air supply port 118a is configured to open near the top wall 212. Therefore, when the supply fan 221 is operating normally, the combustion gas is smoothly taken into the supply duct 220 and supplied into the cultivation chamber 2 .

Further, the temperature sensor 215 is provided on the inner wall surface above the opening 214b of the side wall 213b closest to the exhaust port 119a, at a position closer to the air supply port 118a than the exhaust port 119a in the horizontal direction along the inner wall surface. By providing the temperature sensor 215 at such a position, it is possible to appropriately detect the temperature of the combustion gas that is higher than normal. Therefore, the malfunction of the supply fan 221 can be detected satisfactorily using the temperature sensor 215 .

Furthermore, as shown in FIG. 6, when the temperature sensor 215 detects a temperature equal to or higher than a predetermined value, the operation of the combustor 102 is stopped, thereby preventing combustion failure in the combustor 102.

Furthermore, as shown in FIGS. 4A and 4B, cover members 216 are fitted in the openings 214a to 214d, respectively. For example, a net, a filter, or the like can be used as the cover member 216 . By fitting the cover member 216 into the openings 214a to 214d, it is possible to remove dust and dirt in the air. Also, insects and the like can be prevented from entering the duct hood 210 .

Furthermore, as shown in FIGS. 4A and 4B, of the openings 214a to 214d, the openings 214a and 214c facing each other are located at the side walls 213a and 213c, respectively, from the top surface 100a of the housing 100. Although the height position is different, it is designed so that the size of the opening is the same. Accordingly, cover members 216 having the same shape and area can be used to be fitted in the openings 214a and 214c. Note that all the openings 214a to 214d may be configured to have the same size.

<Change example>
In the above embodiment, a CO ₂ concentration sensor for detecting the CO ₂ concentration around the plant may be provided at a position distant from the outlet 224 of the supply duct 220 . In this case, when the CO ₂ supply operation is started, in the heat source device 10, the control unit 401 acquires the CO ₂ concentration detected by the CO ₂ concentration sensor. If the concentration detected by the CO ₂ concentration sensor is equal to or lower than the minimum CO ₂ concentration ( _first concentration) required for plant growth, control unit 401 controls combustion fan 114 and circulation Activate the pump 110 . Furthermore, the control unit 401 ignites the combustor 102 by operating the supply pump 105 , the vaporization heater 106 and the igniter 107 , and operates the supply fan 221 .

Furthermore, when a CO ₂ concentration sensor is provided, if the detected CO ₂ concentration exceeds the concentration at which it can be determined that the CO ₂ required for plant growth is satisfied, it is no longer necessary to generate CO ₂ . Therefore, the control unit 401 once terminates the CO ₂ supply operation. If the end operation is not performed, the control unit 401 waits until the CO ₂ concentration becomes equal to or lower than the first concentration again.

Furthermore, in the above embodiment, a CO concentration sensor for detecting the concentration of CO (carbon monoxide) contained in the combustion gas may be arranged above exhaust duct 119 . In this case, when the CO concentration sensor detects a CO concentration equal to or higher than a predetermined value, the CO ₂ supply device 1 can be configured, for example, to sound an alarm to inform the surroundings. Alternatively, the CO ₂ supply device 1 may be configured to terminate the operation of the CO ₂ supply device 1 .

Furthermore, the arrangement positions of the air supply port and the exhaust port in the base of the duct hood are not limited to the arrangement positions of the above embodiments. For example, the air supply port and the air exhaust port may be arranged in the center of the base in the X-axis direction and aligned in the Y-axis direction.

Furthermore, in the above embodiment, since the side wall 213a is closest to the air supply port 118a, the opening 214a of the side wall 213a is configured to open higher than the other openings 214b to 214c. However, if the arrangement position of the air supply port 118a is changed, for example, if the side wall 213d becomes closest to the air supply port 118a, the opening 214d of the side wall 213d opens higher than the other openings 214a to 214c. It will be done. Similarly, the side wall on which the temperature sensor 215 is provided can be changed to match the change in the position of the outlet 119a.

Furthermore, in the above embodiment, the opening 214a has the same size as the opening 214c, but the height position from the base of the duct hood, that is, the top surface of the housing is higher than the opening 214c. , and is configured to open upward from the opening 214c. However, although the opening 214a has the same height position from the base as the opening 214c, it may be made larger than the opening 214c so that it opens upwards from the opening 214c. .

Furthermore, in the above embodiment, the combustor 102 is stopped when the temperature detected by the temperature sensor 215 exceeds the predetermined temperature. However, for example, when the detected temperature exceeds the predetermined temperature, the rotation speed of the supply fan 221 is increased, and if the detected temperature continues to exceed the predetermined temperature, the combustor 102 is stopped. may Further, when the detected temperature exceeds a predetermined temperature, a notification may be given by a beep sound or voice from a speaker, or a display on the display unit.

Various operations other than stopping the combustor may be performed as predetermined processing for the abnormality when the detected temperature exceeds a predetermined temperature.

Furthermore, in the above embodiment, the fuel of the combustor 102 is liquid fuel such as kerosene, but it may be gaseous fuel such as propane gas.

In addition, in the CO ₂ supply device 1 according to the embodiment of the present invention, the supply duct 220 and the supply fan 221 are included in the duct unit 12, but the CO ₂ supply device 1 according to the embodiment of the present invention A configuration that does not include the duct 220 and the supply fan 221 may be employed.

In addition, the embodiments of the present invention can be modified as appropriate within the scope of the claims.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and the embodiments of the present invention can be modified in various ways other than those described above. .

1 CO ₂ supply device 2 cultivation chamber 100 housing 100a top surface of housing 102 combustor 118 air supply duct 118a air supply port 119 exhaust duct 119a exhaust port 210 duct hood 210a outlet 212 top wall of duct hood 213a to 213d duct hood side wall 214a-214d opening 215 temperature sensor 216 cover member 220 supply duct 221 supply fan 401 controller 501 controller

Claims (7)

A CO ₂ supply device for supplying CO ₂ into a cultivation room,
a combustor disposed within the housing for generating combustion gases comprising _CO2 ;
an air supply port and an exhaust port provided on the top surface of the housing;
an air supply duct for introducing air into the combustor through the air supply;
an exhaust duct for guiding the combustion gases to the exhaust port;
a duct hood arranged on the top surface of the housing so as to cover the air supply port and the exhaust port;
a supply duct attached to the outlet of the combustion gas provided on the ceiling wall of the duct hood for guiding the combustion gas into the cultivation chamber;
a supply fan for drawing the combustion gases into the supply duct;
Each of the plurality of side walls of the duct hood is provided with an opening for taking air into the duct hood, and the opening is provided in the side wall closest to the air supply port among the plurality of side walls. The part opens closer to the top wall than the opening provided in the other side wall,
A _CO2 supply device characterized by: The _CO2 supply device according to claim 1,
Among the plurality of side walls, on the inner wall surface above the opening of the side wall closest to the exhaust port, at a position closer to the air supply port side than the exhaust port in the direction along the inner wall surface horizontally, the A temperature sensor is provided for measuring the temperature of the combustion gases,
A _CO2 supply device characterized by: In the _CO2 supply device according to claim 2,
Equipped with a control unit,
The control unit stops the operation of the combustor when the temperature of the combustion gas measured by the temperature sensor exceeds a predetermined value.
A _CO2 supply device characterized by: A _CO2 supply device according to any one of claims 1 to 3,
A breathable cover member is fitted in the opening,
A _CO2 supply device characterized by: A _CO2 supply device according to any one of claims 1 to 4,
The opening provided in the side wall closest to the air supply port among the side walls is the same size as the other opening provided in at least one of the side walls other than the side wall closest to the air supply port. and is provided at a position higher from the top surface of the housing than other openings,
A _CO2 supply device characterized by: A duct hood provided in a CO ₂ supply device that supplies CO ₂ into a cultivation room ,
_The CO2 supply device comprises:
a combustor disposed within the housing for generating combustion gases comprising _CO2 ;
an air supply port and an exhaust port provided on the top surface of the housing;
an air supply duct for introducing air into the combustor through the air supply;
an exhaust duct for guiding the combustion gases to the exhaust port;
a supply duct attached to the outlet of the combustion gas provided on the ceiling wall of the duct hood for guiding the combustion gas into the cultivation chamber;
a supply fan for drawing the combustion gases into the supply duct;
The duct hood is arranged on the top surface of the housing so as to cover the air supply port and the exhaust port,
Each of the plurality of side walls of the duct hood is provided with an opening for taking air into the duct hood, and the opening is provided in the side wall closest to the air supply port among the plurality of side walls. The part opens closer to the top wall than the opening provided in the other side wall,
A duct hood characterized by: A CO ₂ supply device for supplying CO ₂ into a cultivation room,
a combustor disposed within the housing for generating combustion gases comprising _CO2 ;
an air supply port and an exhaust port provided on the top surface of the housing;
an air supply duct for introducing air into the combustor through the air supply;
an exhaust duct for guiding the combustion gases to the exhaust port;
a duct hood arranged on the top surface of the housing so as to cover the air supply port and the exhaust port;
a combustion gas outlet provided on the ceiling wall of the duct hood and fitted with a supply duct for guiding the combustion gas taken in by a supply fan into the cultivation chamber;
Each of the plurality of side walls of the duct hood is provided with an opening for taking air into the duct hood, and the opening is provided in the side wall closest to the air supply port among the plurality of side walls. The part opens closer to the top wall than the opening provided in the other side wall,
A _CO2 supply device characterized by:

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