JP2551200B2 - Heat exchange ventilator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to heat exchange ventilation for performing ventilation while allowing heat exchange between air supplied from outside and air exhausted from inside, The present invention relates to a heat exchange ventilation device in which normal ventilation that performs ventilation without heat exchange can be selected.

<Prior Art> Conventionally, in order to reduce the energy of air conditioning and perform comfortable air conditioning, heat is supplied between the air supplied from the outside to the room and the air discharged from the room to the outside. A heat exchange ventilator designed to be exchanged is used. A typical prior art is disclosed in Japanese Utility Model Publication No. 64-2114, and its basic configuration is shown in FIGS. 6 to 9 of the present application. This heat exchange ventilator is a ceiling-embedded heat exchange ventilator, and a cover plate 4 having an indoor air supply port 2 and an indoor exhaust port 3 is fixed to the lower surface of a substantially rectangular parallelepiped casing 1. .

In the casing 1, a pair of air passages intersecting each other.
A heat exchanger 6 having 6A and 6B is stored. An exhaust fan 8 is provided in an exhaust chamber 7 provided at one end of the casing 1. When the exhaust fan 8 is driven,
The indoor air is guided from the indoor exhaust port 3 to the chamber 7 through one air passage 6A of the heat exchanger 6, and is exhausted to the outside from the exhaust port 7a formed in the exhaust chamber 7 through an exhaust duct (not shown). To be done. On the other hand, air from the outside is supplied to the air supply chamber 9 via an air supply duct (not shown) by driving the air supply fan 10 provided in the air supply chamber 9 provided at the other end of the casing 1. The air is supplied from the formed air supply port 9a to the space in the air supply chamber 9. The outside air guided to the air supply chamber 9 is further supplied to the room from the indoor air supply port 2 via the other air passage 6B of the heat exchanger 6. In the heat exchanger 6, heat exchange is performed between the exhausted air and the supplied air.

In the casing 1, a heat exchanger 6 is housed, and an exhaust passage 11 that guides the air from the indoor exhaust port 3 to the heat exchanger 6 and an exhaust passage 12 through which the air from the room through the heat exchanger 6 circulates. The formed space and the exhaust chamber 7 are
It is partitioned by a partition wall 13 and an opening / closing plate 14.

FIG. 9 shows a detailed structure near the opening / closing plate 14. In the partition wall 13, a bypass hole 16 and an exhaust communication hole 15 corresponding to the exhaust passages 11 and 12 are arranged so as to be located on a diagonal line thereof. A pair of guide rails 17 arranged in parallel with the diagonal line are fixed to the partition wall 13, and the opening / closing plate 14 formed of a plate-shaped body having a substantially hexagonal shape is engaged with the guide rails 17. . The other end of a coil spring 18 whose one end is fixed to the casing 1 is fixed to the opening / closing plate 14, and the opening / closing plate 14 is fixed by the spring force of the coil spring 18.
Are normally located at positions that close the bypass hole 16.

A link mechanism 20 driven by a geared motor 19 is also engaged with the opening / closing plate 14, and the opening / closing plate 14 is displaced in the arrow R1 direction against the spring force of the coil spring 18 by energizing the geared motor 19. . As a result, the exhaust communication hole 15 can be closed by the opening / closing plate 14, and in this state, the bypass hole 16 is opened. When the power supply to the geared motor 19 is stopped, the opening / closing plate 14 is guided by the coil spring 18 to the position where the bypass hole 16 is closed. Reference numeral 70 denotes a holder in which a cushion material is lined, and the opening / closing plate 14 closes the bypass hole 16 in an airtight manner.

In the above configuration, the opening / closing plate 14 allows the exhaust communication hole
Either one of 15 and the bypass hole 16 can be selectively closed. Exhaust communication port 15 by blocking bypass hole 16
In the state where the air is open, the air from the indoor exhaust port 3 is exhausted to the outside from the exhaust passage 11 via the air passage 6A of the heat exchanger 6 and the exhaust passage 12 via the exhaust chamber 7 to the outside. Heat is exchanged with the air supplied from the outside.

On the other hand, when the exhaust communication hole 15 is closed and the bypass hole 16 is opened, the air from the indoor exhaust port 3 is exhausted from the exhaust passage 11 through the bypass hole 16 and the exhaust chamber 7. That is, since the heat exchanger 6 is bypassed and exhausted, heat is not exchanged between the exhausted air and the air supplied to the room.

In this way, by controlling the energization of the geared motor 19, the heat exchange ventilation operation in which ventilation is performed while performing heat exchange and the normal ventilation operation in which ventilation is performed without heat exchange are switched.

However, in the above configuration, the blockage of the bypass hole 16 is
This is performed solely by the spring force of the coil spring 18, and the durability of the coil spring 18 is short, so that there is a problem in that the deterioration of the sealing characteristics is rapid. If the sealing characteristics deteriorate,
When heat exchange ventilation is performed, the amount of air exhausted outside without going through the heat exchanger 6 increases, which deteriorates the heat exchange efficiency.

A configuration that solves this problem is shown in, for example, Japanese Patent Application No. 2-63698 previously filed by the applicant, and the configuration is shown in FIG. 10 of the present application. In FIG. 10, parts corresponding to the respective parts shown in FIG. 9 are given the same reference numerals. In this proposed example, one end of a swing lever 77, which is rotatably supported by a fulcrum 76, is connected near the center of the opening / closing plate 14 in a floating state so as to allow linear movement of the opening / closing plate 14, and The other end of the swing lever 77 is connected to a connecting lever 79 which is connected to a position separated from the axis of the rotor 78 which is rotationally driven by the motor.
Then, by rotating the rotor 78, the swing lever 77 is swung in the arrow R2 direction, whereby the opening / closing plate 14 is displaced in the arrow R3 direction. Reference numeral 80 is a leaf spring for pressing the opening / closing plate 14 against the partition wall 13 to hermetically close the bypass hole 16.

According to this configuration, since either the exhaust communication hole 15 or the bypass hole 16 can be selectively closed by the opening / closing plate 14 without using the coil spring as in the above-described prior art, the coil spring as described above can be used. The problem of premature deterioration of the sealing characteristics due to durability does not occur.

<Problems to be Solved by the Invention> However, in the configuration of this proposed example, when the operation of the heat exchange ventilation device is stopped, the opening / closing plate 14 has the exhaust communication hole.
Which of the bypass holes 16 and 15 is closed is
Depends on the operating state of the heat exchange ventilator immediately before shutdown.
If the blocking plate 14 blocks the exhaust communication hole 15,
When the operation is stopped in the state where 16 is opened, the outside and the inside of the room communicate with each other without the heat exchanger 6 in a state where the exhaust is not performed. Therefore, pests and the like can easily enter the room from the outside.

Therefore, an object of the present invention is to solve the above-mentioned technical problem and to provide a heat exchange ventilation device capable of reliably preventing invasion of harmful insects from the outside when the operation is stopped.

<Means for Solving the Problems> A heat exchange ventilation device of the present invention for achieving the above object is a heat exchange between air supplied from the outside to the room and air discharged from the room to the outside. A heat exchanger for performing the above, an exhaust passage for guiding air to be exhausted from the room to the heat exchanger, and a bypass passage for exhausting the air to be exhausted by-passing the heat exchanger. A heat exchange ventilator comprising: switching means for selectively opening and closing the other; and a drive means for driving the switching means by a crank mechanism driven by a motor. During stoppage, the switching means is provided with control means for controlling the drive means so as to close the bypass passage and open the exhaust passage.

<Operation> According to the above configuration, the drive means is controlled so that the bypass passage is closed and the exhaust passage is opened by the switching means while the operation is stopped. Therefore, in the operation stopped state, the bypass passage is closed, and the heat exchanger is interposed between the outdoor space and the indoor space. For this reason, pests or the like from the outside cannot enter the indoor side of the heat exchanger.

<Examples> Detailed description will be given below with reference to the accompanying drawings showing examples.

FIG. 3 is a plan view showing a simplified internal configuration of a heat exchange ventilation device according to an embodiment of the present invention, and FIG. 4 is a side view showing the internal configuration thereof. This heat exchange ventilator
The air from the outside is guided from the air supply duct 21 through the outdoor air supply port 22, and the air from the room is discharged from the exhaust duct 23.
A casing 25, which is guided from the inside through the indoor side exhaust port 24, is provided. The outside air from the outdoor air supply port 22 flows along a path 29 from the air supply passage 26 to the air supply fan 28 through the heat exchanger 27, and then from the air supply fan 28 to the indoor air supply port 30 to supply air. It is supplied from the air duct 31 into the room.

On the other hand, the indoor air from the indoor exhaust port 24 is provided in a passage in the vicinity of the indoor exhaust port 24, by the switching means driven by the crank mechanism 32 driven by the damper motor DM and rotated in the arrow 33 direction. Depending on the position of a certain damper 34, the fluid flows through the casing 25 along either one of the paths 35 and 36. That is, when the damper 34 is at the position shown by the solid line in FIG. 3, the indoor air from the indoor exhaust port 24 is routed from the exhaust passage 37A through the heat exchanger 27 to the exhaust passage 37B to the exhaust fan 38. Distribute according to 35. on the other hand,
When the damper 34 is at the position shown by the chain double-dashed line in FIG. 3, it flows through the casing 25 along the path 36 from the exhaust passage 37B to the exhaust fan 38 via the bypass passage 39 bypassing the heat exchanger 27.

That is, the damper 34 selectively opens one of the exhaust passage 37A and the bypass passage 39 and closes the other so that heat is exchanged between the outside air and the indoor air exhausted by the heat exchanger 27. The heat exchange ventilation described above is switched to the normal ventilation in which the exhausted indoor air bypasses the heat exchanger 27 to perform ventilation without the above heat exchange. In the present embodiment, the drive means is configured to include the crank mechanism 32 and the damper motor DM.

Indoor air from the exhaust fan 38 is exhausted to the outside from the outdoor exhaust port 40 via the exhaust duct 41. Reference numeral 42 is a filter of the heat exchanger 27.

FIG. 5 is a perspective view showing a structure for driving the damper 34. The crank mechanism 32 driven by the damper motor DM has a dog 91 whose base end is fixed to the rotation shaft of the damper motor DM, one end rotatably attached to the tip of this dog 91, and the other end to the damper 34. It has a lever 93 rotatably engaged with a fixed mounting member 92.

The damper motor DM is fixed to the bottom plate 95 of the casing 25 by a motor mount 94. In the motor mount 94, a close limit switch 55s and an open limit switch 55o are attached by a mounting member 95 near the dog 91. For example, closed limit switch 55s
Is composed of a micro switch which is turned off when the damper 34 rotates from the position shown by the chain double-dashed line in FIG. 3 to the position shown by the solid line and reaches the rotation end position shown by the solid line. The open limit switch 55o also has damper 3
When 4 is rotated from the position shown by the solid line in FIG. 3 to the position shown by the chain double-dashed line, it is constituted by a micro switch which is turned off at the time when it reaches the rotation end position shown by the chain double-dashed line.

FIG. 2 is a block diagram showing the electrical configuration of the heat exchange ventilation device of this embodiment. The heat exchange ventilation device includes a control circuit 50 that controls the motor M1 of the air supply fan 28, the motor M2 of the exhaust fan 38, and the damper motor DM. A voltage of, for example, single-phase 200V is supplied to the control circuit 50 from a power supply device (not shown) via a step-down transformer 51. Control circuit
Also connected to 50 is a remote control unit 52 provided in the room to which the ducts 23 and 31, for example, are connected.

This remote control unit 52 automatically switches between operation / stop of the heat exchange ventilation device, air volume switching (strong wind, weak wind), heat exchange ventilation and normal ventilation, and normal ventilation and heat exchange ventilation. The switch 52a is provided for switching between the automatic mode performed in step 1 and the manual mode in which the above switching is performed manually.

Electric power from the power supply device is supplied to the motor M1 of the air supply fan 28 from the lines 53 and 54 through the switches S1H and S1L, and is supplied to the motor M2 of the exhaust fan 38 through the switches S2H and S2L. There is. The switches S1H and S2H are connected to the high speed rotation terminals T1H and T2H of the motors M1 and M2, respectively, and the switches S1L and S2L are connected to the low speed rotation terminals T1L and T2L of the motors M1 and M2, respectively. One of the switches S1H and S1L is turned on, and the motor M1 is switched to two states of high speed rotation and low speed rotation. Switch S2H, S2L
Is also the same. Each of the above switches S1H, S1L, S2H,
S2L is controlled by the control circuit 50, whereby the motors M1 and M2 are controlled.

Further, the electric power from the power supply device is controlled by the control circuit 50 and is switched from the changeover switch SW for switching between the normal ventilation and the heat exchange ventilation to the above-mentioned open limit switch 55o.
Or damper motor DM via closed limit switch 55s
Is supplied to

FIG. 1 is a flow chart for explaining the operation of the control circuit 50. At step n1, the main power is turned on,
When the main power is turned on, the changeover switch SW is connected to the close limit switch 55s side in step n2, and the damper 34 is set to the third position.
The position shown by the solid line in the figure is the state in which the passage 39 is closed. Hereinafter, the case where the damper 34 is in the position indicated by the solid line in FIG. 3 is referred to as “the damper 34 is in the closed state”,
The case where it is at the position shown by the chain double-dashed line in the figure is called "the damper 34 is in the open state".

In step n3, it is determined by referring to the signal from the remote control unit 52 whether or not the operation switch is turned on. If not, the damper 34 is closed in step n4, and in step n5 the motor M1, M2 is turned off, that is, all the switches S1H, S1L, S2H, and S2L are cut off to stop the air supply fan 28 and the exhaust fan 38. Therefore, in the stopped state, the damper 34 is in the closed state, and prevents pests and the like from entering from the outside through the passage 39.

If it is determined in step n3 that the operation switch is turned on, the process proceeds to step n6 and switches S1H, S2H or S1L, S
2L is conducted, the supply / exhaust motors M1, M2 are energized, and the supply / exhaust fans 28, 38 are driven.

In step n7, it is determined whether or not a predetermined time ΔT (for example, 10 seconds) has elapsed after the main power is turned on by referring to the clock time of a timer (not shown) that starts when the main power is turned on. When this predetermined time ΔT has not elapsed, the process waits until this time elapses, and then the process proceeds to step n8. The predetermined time ΔT is a time that should be set in consideration of the time required to complete the mechanical operation.

In step n8, it is determined whether or not heat exchange ventilation is selected in the remote controller unit 53. If heat exchange ventilation is selected, the process returns to step n3, and if heat exchange ventilation is not selected, the process proceeds to step n9. In step n9, the switch SW is connected to the open limit switch 55o side, the damper 34 is opened, and normal ventilation without heat exchange is performed. Subsequent processing returns to step n3.

By such control operation of the control circuit 50, the damper 34 is always closed when the operation switch is turned off (steps n3, n4, n5). Therefore, when the heat exchange ventilation device is in a stopped state and the exhaust fan 38 is in a stopped state, the space between the outdoor side exhaust duct 41 and the indoor side exhaust duct 23 does not go through the heat exchanger 27. There is no communication, and the heat exchanger 27 is always interposed between the two.

Therefore, in the operation stop state in which the exhaust fan 38 is stopped, even if the housing 25
Even if a pest or the like gets inside, the pest cannot move to the room side beyond the filter 42 of the heat exchanger 27. In this way, it is possible to reliably prevent pests and the like from entering the room when the operation is stopped.

Of course, in this embodiment, since the coil spring used in the prior art shown in FIG. 9 and the like is not used, the problem of early deterioration of the sealing characteristics due to the durability of the coil spring does not occur.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the structure in which the exhaust path is switched by the rotated damper 34 to switch between heat exchange ventilation and normal ventilation has been described as an example. The present invention can be easily applied to a configuration in which heat exchange ventilation and normal ventilation are switched by the sliding opening / closing plate 14 as in the configuration. That is, for example, in the heat exchange ventilator of FIG. 10, the opening / closing plate 14 may be located at a position where the bypass hole 16 is closed and the exhaust communication hole 15 is opened while the operation is stopped. Other within the scope of not changing the gist of the present invention,
Various design changes can be made.

<Effects of the Invention> As described above, according to the heat exchange ventilation device of the present invention, in the operation stopped state, the bypass passage is closed, and the heat exchanger is interposed between the outdoor space and the indoor space. Therefore, pests and the like from the outside cannot enter the indoor side of the heat exchanger. Thereby, invasion of harmful insects can be surely prevented.

[Brief description of drawings]

FIG. 1 is a flow chart for explaining the operation of a heat exchange ventilation device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the electrical configuration of the heat exchange ventilation device, and FIG. 3 is the heat exchange ventilation. FIG. 4 is a simplified plan view showing the internal configuration of the apparatus, FIG. 4 is a simplified side view showing the internal configuration of the apparatus, FIG. 5 is a perspective view showing the configuration for driving the damper 34, and FIG. Fig. 7 is a front view showing the structure of the technology, Fig. 7 is a side view of the same, Fig. 8 is a cross-sectional view showing the internal structure of the same, Fig. 9 is a side view showing the structure of the main part of the same, and Fig. 10 is the present case. It is a side view which shows the structure of the principal part of the applicant's previous proposal example. 27 ... Heat exchanger, 37A ... Exhaust passage, 39 ... Bypass passage, 24 ... Damper (switching means), 32 ... Crank mechanism, 50 ... Control circuit (control means), 55s ... Closed limit switch , 55o …… Open limit switch, DM …… Damper motor

Claims (1)

(57) [Claims] 1. A heat exchanger (27) for exchanging heat between the air supplied from the outdoors to the room and the air exhausted from the room to the outdoors, and the air to be exhausted from the room as the heat. An exhaust passage (37A) leading to the exchanger (27) and a bypass passage (39) for exhausting the air to be exhausted by bypassing the heat exchanger (27).
, A switching mechanism (34) for selectively opening one of them and closing the other, and a crank mechanism (32) driven by a motor (DM), and the switching mechanism by the crank mechanism (32). A heat exchange ventilator comprising a drive means (DM, 32) for driving (34), wherein the switching means (34) closes the bypass passage (39) while the operation is stopped. A heat exchange ventilator comprising a control means (50) for controlling the drive means (DM, 32) so as to open 37A).