JP2023013044A - Heat exchange ventilation device - Google Patents

Abstract

To provide a heat exchange ventilation device enabling switching from heat exchange ventilation to normal ventilation even when an auxiliary air blower is driven during stop of an operation.SOLUTION: A heat exchange ventilation device includes: a heat exchanger 10 exchanging heat between a supply air current generated by an air supply air blower 8 and a discharge air current generated by an air discharge air blower 9; a casing 20 having an air supply air course 6 in which the air supply air blower 8 is installed, an air discharge air course 7 in which the air discharge air blower 9 is installed, and a normal ventilation air course 11 connecting a portion on a recirculation air suction port 3 side of the heat exchanger 10 and a portion on an exhaust discharge port 5 side of the heat exchanger 10 in the air discharge air course 7; an air course switching damper 12 installed in a branch portion between the air discharge air course 7 on the recirculation air suction port 3 side of the heat exchanger 10 and the normal ventilation air course 11; a control section 15 controlling which of a heat exchanger communication passage 7a or the normal ventilation air course 11 is closed by the air course switching damper 12; and a wind pressure type damper 13 installed on the exhaust discharge port 5 side of the air discharge air blower 9 in the air discharge air course 7 and opening/closing an opening connecting inside and outside of the casing 20.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a heat exchange ventilator that performs ventilation while exchanging heat between an intake air stream and an exhaust air stream.

As disclosed in Patent Document 1, an air supply air path for supplying outdoor air to the room, an exhaust air path for discharging indoor air to the outside, an air supply flow passing through the air supply air path, and an exhaust air passing through the exhaust air path A heat exchanger that exchanges heat, a normal ventilation duct that bypasses the heat exchanger and discharges the indoor air to the outside, and either exhausts the indoor air to the outside through the heat exchanger or to the outdoor through the normal ventilation duct. A heat exchange ventilator equipped with an air passage switching damper that switches whether to exhaust air is known. Such a heat exchange ventilator is connected to an air supply duct and an exhaust duct, supplies outdoor air into the room through the air supply duct, and exhausts indoor air to the outside through the exhaust duct.

JP 2011-220639 A

When installing a heat exchange ventilator, an auxiliary blower may be installed in a portion of the exhaust duct on the outdoor side of the heat exchanger in order to ensure static pressure in the exhaust duct. If the operation of the heat exchange ventilator and the auxiliary fan are not interlocked, if the auxiliary fan is driven while the heat exchange ventilator is not operating, the part of the exhaust air passage downstream of the heat exchanger and the normal ventilation air Negative pressure is created in the road. When negative pressure is generated in the normal ventilation air passage, the pressure difference between the part of the exhaust air passage upstream of the heat exchanger and the normal ventilation air passage draws the air passage switching damper to the normal ventilation air passage, and the normal ventilation wind is released. It blocks the airway and makes it impossible to switch from heat exchange ventilation to normal ventilation.

The heat exchange ventilator disclosed in Patent Document 1 does not have means for eliminating the pressure difference between the portion of the exhaust air passage upstream of the heat exchanger and the normal ventilation air passage. To switch from heat exchange ventilation in which heat is exchanged between the supply air flow and the exhaust flow to normal ventilation in which heat exchange is not performed between the supply air flow and the exhaust flow when the auxiliary fan is operating when the operation is stopped. Therefore, it was necessary to increase the torque of the driving device that drives the air passage switching damper.

The present disclosure has been made in view of the above, and an object thereof is to obtain a heat exchange ventilator that can switch from heat exchange ventilation to normal ventilation even when the auxiliary fan is driven when the operation is stopped.

In order to solve the above-described problems and achieve the object, the heat exchange ventilation device according to the present disclosure includes a supply air blower, an exhaust blower, an supply air flow generated by the supply air blower, and an exhaust flow generated by the exhaust blower. Connect the heat exchanger that exchanges heat between the outside air inlet and the supply air outlet, and connect the supply air path where the supply air blower is installed, the return air inlet and the exhaust outlet. , the normal ventilation air passage that connects the exhaust air passage where the exhaust fan is installed, and the part of the exhaust air passage that is closer to the return air inlet than the heat exchanger and the part that is closer to the exhaust outlet than the heat exchanger and a box body provided with. The heat exchange ventilation system has an air passage switching damper installed at the junction of the exhaust air passage and the normal ventilation air passage on the return air intake side of the heat exchanger, and an air passage switching damper in the exhaust air passage. A control unit that controls which of the heat exchanger communication path, which is the part between the heat exchanger and the heat exchanger, and the normal ventilation air path, which the air path switching damper blocks, and the exhaust air path A wind pressure type damper is installed on the side of the exhaust outlet from the exhaust blower and opens and closes an opening connecting the inside and the outside of the box body.

Advantageous Effects of Invention According to the present disclosure, it is possible to obtain a heat exchange ventilator that can switch from heat exchange ventilation to normal ventilation even when the auxiliary blower is driven when operation is stopped.

Schematic diagram showing the configuration of a heat exchange ventilator according to Embodiment 1 1 is an exploded perspective view of a wind pressure damper of a heat exchange ventilator according to Embodiment 1. FIG. FIG. 4 is a diagram showing the air flow during heat exchange ventilation of the heat exchange ventilator according to Embodiment 1. FIG. FIG. 4 shows the flow of air during normal ventilation of the heat exchange ventilator according to Embodiment 1. FIG. FIG. 4 is a diagram showing the flow of air when the auxiliary blower is driven while the operation of the heat exchange ventilator according to Embodiment 1 is stopped; Schematic diagram showing a state in which the wind pressure damper of the heat exchange ventilator according to Embodiment 1 is open

A heat exchanging ventilator according to an embodiment will be described in detail below with reference to the drawings.

Embodiment 1.
FIG. 1 is a schematic diagram showing the configuration of a heat exchange ventilator according to Embodiment 1. FIG. The heat exchange ventilator 1 is connected to the supply air passage 6 connecting the outside air suction port 4 and the supply air discharge port 2, the exhaust air passage 7 connecting the return air suction port 3 and the exhaust discharge port 5, and the exhaust air passage 7. It has a box body 20 provided with a normal ventilation air passage 11 which is a bypass air passage. The air supply outlet 2 is connected to an air supply duct 41 leading from the space above the ceiling into the room. The return air intake port 3 is connected to an exhaust duct 42 leading into the room from above the ceiling. The outside air intake port 4 is connected to an air supply duct 43 leading from the ceiling to the outside. The exhaust discharge port 5 is connected to an exhaust duct 44 leading from the space above the ceiling to the outside. An auxiliary blower 45 is installed in the exhaust duct 44 . The normal ventilation air passage 11 discharges the indoor air taken in from the return air suction port 3 to the outside from the exhaust discharge port 5 without passing through the heat exchanger 10. - 特許庁

A supply air blower 8 for supplying outdoor air taken in from the outside air suction port 4 to the room from the air supply discharge port 2 is provided in a portion of the supply air passage 6 closer to the air supply discharge port 2 than the heat exchanger 10 is. is set up. An exhaust air blower 9 is installed in a portion of the exhaust air passage 7 closer to the exhaust outlet 5 than the heat exchanger 10 for discharging indoor air taken in from the return air inlet 3 to the outside from the exhaust outlet 5. ing.

A heat exchanger 10 is installed inside the box 20 . The heat exchanger 10 exchanges heat between air taken in from the outside and passing through the supply air passage 6 and air taken in from the room and passing through the exhaust air passage 7. - 特許庁The normal ventilation air passage 11 consists of a portion of the exhaust air passage 7 on the side of the return air suction port 3 that is upstream of the heat exchanger 10 and a portion on the side of the exhaust outlet 5 that is downstream of the heat exchanger 10. It is connected to the.

The heat exchange ventilator 1 has an air passage switching damper 12 . The air passage switching damper 12 is arranged at a branching portion between the exhaust air passage 7 upstream of the heat exchanger 10 and the normal ventilation air passage 11 in the exhaust air passage 7 . The air path switching damper 12 blocks the heat exchanger connecting path 7a, which is the portion between the heat exchanger 10 and the portion of the exhaust air path 7 where the air path switching damper 12 is installed, and the normal ventilation air path. 11 is blocked. When the air path switching damper 12 blocks the normal ventilation air path 11, the heat exchanger communication path 7a is opened, and the indoor air taken in from the return air suction port 3 passes through the heat exchanger 10 to the exhaust air outlet. flow to 5. On the other hand, when the air passage switching damper 12 closes the heat exchanger connecting passage 7a, the normal ventilation air passage 11 is opened, and the indoor air taken in from the return air suction port 3 bypasses the heat exchanger 10 and passes through the exhaust air discharge port. flow to 5.

The heat exchange ventilator 1 has a control section 15 . The control unit 15 controls the supply air blower 8 , the exhaust air blower 9 , and the air path switching damper 12 .

The air passage switching damper 12 has a driving device (not shown). The control unit 15 realizes the switching of air paths by controlling the driving device of the air path switching damper 12 .

A wind pressure damper 13 is installed on the side of the box 20 that is 90 degrees different from the side on which the exhaust outlet 5 is provided. The wind pressure damper 13 is installed closer to the exhaust outlet 5 than the exhaust blower 9 in the exhaust air passage 7 and opens and closes an opening that connects the inside and outside of the box 20 .

2 is an exploded perspective view of a wind pressure damper of the heat exchange ventilator according to Embodiment 1. FIG. The wind pressure damper 13 is composed of two parts: a square lid-shaped wind pressure damper outer shell 50 and a square plate-shaped wind pressure damper plate 51 . The wind pressure damper plate 51 is attached to a side surface of the box 20 oriented 90° away from the side surface on which the exhaust outlet 5 is provided, using plate fastening screws 53 through attachment holes formed in the four corners. A wind pressure damper shell 50 is fixed to a wind pressure damper plate 51 with a tightening screw 54, and the wind pressure damper 13 as a whole has a box shape.

The wind pressure damper shell 50 is provided with a slit-shaped suction guard 57 which is a cover for preventing foreign objects such as small animals in the ceiling space from entering the heat exchanging ventilator 1 and the exhaust duct 44 .

A mechanism for opening and closing the damper plate 14 will be described. A pair of support plates 55 are attached to the wind pressure damper plate 51 . The support plate 55 and the damper plate 14 are provided with circular holes to which the support bushes 56 are attached. By fixing the support bush 56 to the holes of the support plate 55 and the damper plate 14 , the support bush 56 serves as a fulcrum, and the air flowing from the suction guard 57 pushes up the damper plate 14 by wind pressure.

The damper plate 14 is larger than the opening 52 and is stacked such that the damper plate 14 is on the indoor side and the wind pressure damper plate 51 is on the outdoor side. When no external force is applied to the damper plate 14, the damper plate 14 comes into close contact with the surface of the wind pressure damper plate 51 having the opening 52 formed therein due to its own weight. Therefore, in a state in which the damper plate 14 closes the opening 52, air leakage from the mating surfaces of the wind pressure type damper plate 51 and the damper plate 14 is prevented.

Wind pressure is applied to the damper plate 14 when the air in the ceiling space taken in through the suction guard 57 passes through the opening 52 of the wind pressure damper plate 51 . By applying wind pressure to the damper plate 14, the damper plate 14 opens toward the exhaust air blower 9 side, and the air in the ceiling space flows into the vicinity of the exhaust outlet 5 in the box body 20. - 特許庁

FIG. 3 is a diagram showing the flow of air during heat exchange ventilation of the heat exchange ventilator according to Embodiment 1. FIG. During heat exchange ventilation, the control unit 15 controls the air passage switching damper 12 to block the normal ventilation air passage 11 . When the control unit 15 drives the supply air blower 8 and the exhaust air blower 9 in a state in which the air path switching damper 12 blocks the normal ventilation air path 11, the outdoor air taken in from the outside air inlet 4 and the return air are taken in. The indoor air taken in from the port 3 passes through the heat exchanger 10 and is heat-exchanged. The air after heat exchange is discharged into the room from the supply air discharge port 2 and discharged to the outside from the exhaust discharge port 5, so that ventilation can be performed while exchanging heat between the exhaust flow 17 and the supply air flow 16.例文帳に追加

The heat exchange ventilator 1 according to Embodiment 1 performs the normal ventilation operation when it is set to perform ventilation without heat exchange. FIG. 4 is a diagram showing the flow of air during normal ventilation in the heat exchange ventilator according to Embodiment 1. FIG. During normal ventilation, the controller 15 controls the air passage switching damper 12 to close the heat exchanger communication passage 7a. When the control unit 15 drives the supply air blower 8 and the exhaust air blower 9 with the air passage switching damper 12 blocking the heat exchanger communication passage 7a, the outdoor air taken in from the outside air suction port 4 undergoes heat exchange. It passes through the container 10 and is discharged from the supply air discharge port 2. On the other hand, the indoor air taken in from the return air suction port 3 is discharged from the exhaust discharge port 5 without passing through the heat exchanger 10 . Therefore, during normal ventilation, ventilation can be performed without exchanging heat between the exhaust flow 17 and the supply air flow 16 .

In a state in which the control unit 15 drives the exhaust air blower 9 at the maximum output air volume, indoor air taken in from the return air suction port 3 is blocked by the air passage switching damper 12 (not shown) blocking the heat exchanger communication passage 7a. The wind pressure exceeding the torque of the driving device hits the air path switching damper 12, and the heat exchange ventilation cannot be switched to the normal ventilation. Therefore, when switching from heat exchange ventilation to normal ventilation, the control unit 15 stops the exhaust fan 9 and drives the air path switching damper 12 in a state where no wind pressure is applied to the air path switching damper 12 .

FIG. 5 is a diagram showing the flow of air when the auxiliary blower is driven while the operation of the heat exchange ventilator according to Embodiment 1 is stopped. When the auxiliary blower 45 is driven while the heat exchange ventilator 1 is out of operation with the air passage switching damper 12 blocking the normal ventilation air passage 11, the heat exchanger 10 in the exhaust air passage 7 The air in the downstream portion and the normal ventilation air passage 11 is sucked out from the exhaust outlet 5, and as shown in FIG. A flowing airflow 30 is formed, and negative pressure is generated in the portion of the exhaust air passage 7 downstream of the heat exchanger 10 and in the normal ventilation air passage 11 .

FIG. 6 is a schematic diagram showing a state in which the wind pressure damper of the heat exchange ventilator according to Embodiment 1 is open. When the auxiliary blower 45 is driven and negative pressure is generated in the portion of the exhaust air passage 7 downstream of the heat exchanger 10 and in the normal ventilation air passage 11, the force of the negative pressure that pulls the damper plate 14 into the box body 20 is generated. When the damper plate 14 becomes stronger than its own weight, as shown in FIG. The negative pressure inside the box 20 of the heat exchanging ventilator 1 is eliminated by forming an airflow 31 that flows into the box 20 from above the ceiling through the wind pressure damper 13 .

When the wind pressure damper 13 is open and the negative pressure inside the box body 20 is eliminated, the control unit 15 controls the air passage switching damper 12 to close the heat exchanger connection passage 7a, and switch from heat exchange ventilation to normal ventilation. can be switched to

Since the wind pressure damper 13 is arranged downstream of the exhaust blower 9, when the control unit 15 drives the supply air blower 8 and the exhaust blower 9, the damper plate 14 is pushed by the blowing pressure of the exhaust blower 9. The opening 52 of the wind pressure damper 13 is closed. Therefore, when the control unit 15 drives the supply air blower 8 and the exhaust air blower 9 , the indoor air taken in from the return air suction port 3 is discharged from the exhaust air discharge port 5 .

When the wind pressure damper 13 is open, there is no air pressure difference between the portion of the exhaust air passage 7 upstream of the heat exchanger 10 and the normal ventilation air passage 11. It is possible to switch from normal ventilation to heat exchange ventilation by controlling the blockage of the heat exchanger communication path 7a.

When the heat exchange ventilator 1 resumes operation in response to a command from the control unit 15, the exhaust air blower 9 installed in the exhaust air passage 7 is driven, so the damper installed downstream of the exhaust air blower 9 The plate 14 closes the opening 52 with the wind pressure of the exhaust flow 17 generated by the exhaust blower 9 . By closing the wind pressure damper 13, the indoor air taken in from the return air suction port 3 is reliably discharged from the exhaust discharge port 5. - 特許庁

As described above, in the heat exchange ventilator 1 according to Embodiment 1, the wind pressure damper 13 is installed on the side of the box 20 that is 90° different from the side on which the exhaust outlet 5 is provided. , when the auxiliary blower 45 is driven and negative pressure is generated in the portion downstream of the heat exchanger 10 in the exhaust air passage 7 and in the normal ventilation air passage 11, the wind pressure damper 13 is opened and the negative pressure is eliminated. , even if the auxiliary blower 45 is driven when the operation is stopped, the heat exchange ventilation can be switched to the normal ventilation.

The configuration shown in the above embodiment shows an example of the contents, and it is possible to combine it with another known technique, and part of the configuration is omitted or changed without departing from the scope. is also possible.

1 heat exchange ventilator, 2 supply air outlet, 3 return air inlet, 4 outside air inlet, 5 exhaust outlet, 6 supply air passage, 7 exhaust air passage, 7a heat exchanger connecting passage, 8 supply air blower, 9 exhaust air blower, 10 heat exchanger, 11 normal ventilation air passage, 12 air passage switching damper, 13 wind pressure type damper, 14 damper plate, 15 control unit, 16 air supply flow, 17 exhaust flow, 20 box, 30, 31 air flow , 41, 43 air supply duct, 42, 44 exhaust duct, 45 auxiliary blower, 50 wind pressure damper shell, 51 wind pressure damper plate, 52 opening, 53 plate clamping screw, 54 clamping screw, 55 support plate, 56 support bush , 57 suction guard.

Claims (3)

a supply air blower;
an exhaust blower;
a heat exchanger that exchanges heat between a supply air flow generated by the supply air blower and an exhaust flow generated by the exhaust blower;
A supply air passage connecting the outside air intake and the supply air discharge port, the supply air blower being installed, and an exhaust air passage connecting the return air suction port and the exhaust air discharge port, and the exhaust air blower being installed. , a box provided with a normal ventilation air passage connecting a portion of the exhaust air passage closer to the return air inlet than the heat exchanger and a portion closer to the exhaust outlet than the heat exchanger; body and
an air path switching damper installed at a branch point between the exhaust air path and the normal ventilation air path on the return air suction port side of the heat exchanger;
Either the heat exchanger communication passage, which is the portion between the heat exchanger and the portion of the exhaust air passage where the air passage switching damper is installed, or the normal ventilation air passage is selected for the air passage switching. a control unit that controls whether the damper blocks;
A heat exchange ventilator, comprising: a wind pressure damper that is installed closer to the exhaust discharge port than the exhaust air blower in the exhaust air passage, and that opens and closes an opening that connects the inside and the outside of the box. 2. The heat exchanging ventilator according to claim 1, wherein the wind pressure damper is installed on a side of the box that is oriented 90 degrees away from the side on which the exhaust outlet is provided. . 3. The heat exchanging ventilator according to claim 1, wherein the wind pressure damper has a cover for preventing foreign matter from entering the box.

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