JP2012193915A - Ceiling embedded air conditioner for bathroom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a volume of bathroom ventilation with high accuracy when a direction of mounting a ventilation unit is changed.SOLUTION: A ceiling embedded air conditioner for a bathroom is configured such that the change of a direction of mounting a ventilation unit 8 can reverse a direction of air flow passing through a bathroom ventilation path 9, and a control parameter for ventilation volume is switched according to air flow directions. When a direction of mounting the ventilation unit 8 is changed, the air conditioner is operated based on a control parameter for constant air volume most suitable for each air flow direction, thus maintaining a desired ventilation volume with high accuracy.

Description

  The present invention relates to a ceiling-embedded bathroom air conditioner having a constant air volume control function.

  Conventionally, a ceiling-embedded bathroom air conditioner of this type is known in which a ventilation fan motor is controlled so that the ventilation airflow is constant (see, for example, Patent Document 1).

  Hereinafter, the ceiling-embedded bathroom air conditioner will be described with reference to FIG.

  A conventional ceiling-embedded bathroom air conditioner has a configuration in which a circulation fan motor 102 and heating means 103 are provided inside a box-shaped main body 101 and a ventilation unit 104 is attached to a side surface of the main body 101. The ventilation unit 104 includes a ventilation fan motor 105, an exhaust port 106, an intake port 107, and an air volume control means 108. The ventilation air volume is controlled by the rotation speed detection means 108a and the air volume instruction means 108b, and is applied during operation by the storage means 108c. By storing the current value to be performed, the same ventilation air volume can be obtained even when the device is restarted.

  In the ceiling-embedded bathroom air conditioner having the above-described configuration, when the direction of the exhaust port 106 is reversed by 180 degrees for construction reasons, the ventilation unit 104 is reversed by being attached by 180 degrees.

  In the ceiling-embedded bathroom air conditioner having the above-described configuration, the air taken in from the air inlet 107 may be taken into the main body 101, returned to the ventilation unit 104, and exhausted from the air outlet 106.

Japanese Patent No. 4120565

  In such a conventional ceiling-embedded bathroom air conditioner, the bathroom air conditioner in which the main body 101 is newly provided with a compressor, a first heat exchanger, and a second heat exchanger as heating means is ventilated. When the unit 104 is reversed and attached, the air direction when the air sucked from the air inlet 107 passes through the second heat exchanger is reversed, so the characteristics of the in-machine pressure loss change. However, with the conventional constant air volume control parameter, the air volume cannot be adjusted with high accuracy, and there is a problem that a heating capacity is insufficient due to insufficient heat exchange air volume, or a cold draft or operation noise occurs due to excessive air volume.

  Accordingly, the present invention solves the above-described conventional problems, and provides a ventilation device that can secure the ventilation air volume and the heat exchange air volume required for heating with high accuracy even when the installation direction of the ventilation unit is changed. The purpose is to provide.

  In order to achieve this object, the present invention provides a circulation air passage for blowing out air sucked from the bathroom by the circulation fan motor to the bathroom again, and air in other rooms other than the bathroom and bathroom by the ventilation fan motor. A ventilation air passage for bathroom and other room ventilation air passage for sucking in and discharging outside, a rotation speed detecting means for detecting and controlling the rotation speed of the ventilation fan motor, and detecting and controlling an applied current of the ventilation fan motor Current control means for performing, an air volume instruction means for instructing an operating air volume of the ventilation fan motor, a pressure loss estimation means for estimating a pressure loss value of the exhaust duct based on the relationship between the rotational speed of the ventilation fan motor, the applied current, and the air volume; The ventilation fan motor is controlled by the current control means based on the estimated pressure loss value so that the ventilation air flow is constant, By changing the mounting direction, the air direction of the air passing through the bathroom ventilation air passage is reversed, and the ventilation air volume control parameter is switched according to the air direction, thereby achieving the intended purpose. .

  According to the present invention, the circulation air passage that blows out the air sucked from the bathroom by the circulation fan motor to the bathroom again, and the bathroom that sucks the air in the other rooms other than the bathroom and the bathroom by the ventilation fan motor and discharges it to the outdoors. A rotation speed detection means for detecting and controlling the rotation speed of the ventilation fan motor; a current control means for detecting and controlling an applied current of the ventilation fan motor; and the ventilation An air volume instruction means for instructing the operating air volume of the fan motor, a pressure loss estimating means for estimating the pressure loss value of the exhaust duct based on the relationship between the rotational speed of the ventilation fan motor, the applied current and the air volume, and an estimated pressure loss value Based on this, the ventilation fan motor is controlled by the current control means so that the ventilation air volume becomes constant, and the ventilation unit mounting direction is changed. When changing the installation direction of the ventilation unit by reversing the air direction of the air passing through the bathroom ventilation air path and switching the ventilation air volume control parameter according to the air direction, the optimum air volume in each air direction Since it operates by a fixed control parameter, even when the attachment direction of a ventilation unit is changed, the effect that ventilation air volume can be ensured with high precision can be acquired.

The upper surface side block diagram which shows the state which installed the ventilation unit of the ceiling embedded type | mold bathroom air conditioner of Embodiment 1 of this invention so that the flow of a wind might flow in into the 2nd heat exchanger from the circulation wind path side Explanatory drawing which shows the principle of the air volume control means of the ceiling embedded bathroom air conditioner The flowchart which shows the method in which the air volume control means of the ceiling embedded bathroom air conditioner makes the ventilation air volume constant Side-side configuration diagram showing the flow of wind when operating the ceiling-embedded bathroom air conditioner in heating mode Side-side configuration diagram showing the flow of wind when operating the ceiling-embedded bathroom air conditioner in ventilation mode The top side block diagram which shows the state which installed the ventilation unit of the ceiling embedded type | mold bathroom air conditioner so that the flow of a wind might flow in into the 2nd heat exchanger from the ventilation unit side The flowchart which shows the flow which selects an appropriate parameter with the wind direction of the ceiling embedded type | mold bathroom air conditioner of Embodiment 1 of this invention. Explanatory drawing which shows the definition of the cocurrent flow in the ceiling embedded type | mold bathroom air conditioner of Embodiment 1 of this invention Explanatory drawing which shows the definition of the counterflow in the ceiling embedded type | mold bathroom air conditioner of Embodiment 1 of this invention Top view side configuration diagram in which a wind direction sensor is mounted in the other room ventilation air passage of the ceiling-embedded bathroom air conditioner of Embodiment 2 of the present invention Top view of conventional ceiling-mounted bathroom air conditioner

  The ceiling-embedded bathroom air conditioner according to claim 1 of the present invention includes a circulation air passage that blows out air sucked from the bathroom by a circulation fan motor to the bathroom, and a ventilation fan motor other than the bathroom and bathroom. Rotational speed detection means for detecting and controlling the rotational speed of the ventilation fan motor, comprising a bathroom ventilation air passage that sucks air from the other room and discharges it to the outside, and another room ventilation air passage, and an applied current of the ventilation fan motor Current control means for detecting and controlling the airflow, airflow instruction means for instructing the operating airflow of the ventilation fan motor, and pressure for estimating the pressure loss value of the exhaust duct based on the relationship between the rotational speed of the ventilation fan motor, the applied current and the airflow The ventilation fan motor is controlled by the loss estimation means and the rotational speed detection means based on the estimated pressure loss value so that the ventilation air flow is constant. Tsu reversed the wind direction of the air passing through the bathroom ventilating air path by changing the mounting direction of the bets, it has a configuration that it, to switch the ventilation power control parameter by the wind direction. As a result, when changing the mounting direction of the ventilation unit, it operates with the optimal air volume constant control parameter in each wind direction, so even if the mounting direction of the ventilation unit is changed, the ventilation air volume can be secured with high accuracy. There is an effect.

  Moreover, it has a compressor as a heating means of the bathroom, performs heat exchange with the air sucked from the other room by the second heat exchanger installed in the bathroom ventilation air passage, and is installed in the circulation air passage. The heat energy is input to the bathroom through the heat exchanger 1 and the direction of the air passing through the second heat exchanger is reversed by changing the mounting direction of the ventilation unit. It may be configured to switch between. As a result, when heating operation is performed, it is operated with the optimal constant air volume control parameter in each wind direction, so even if the installation direction of the ventilation unit is changed, the necessary heat exchange air volume when heating is highly accurate. There is an effect that it can be secured.

  The switching of the ventilation air volume control parameter may be performed by determining the air direction with a wind direction sensor attached to any one of the bathroom ventilation air channel, the other room ventilation air channel, and the ventilation unit. As a result, the wind direction sensor automatically detects the wind direction and operates with the optimal constant air volume control parameter, so that the installer can operate the device with a more optimal air volume without setting the wind direction. There is an effect.

  Further, the switching of the ventilation air volume control parameter may be manually set in advance by the installer. As a result, when the installer changes the setting for switching the ventilation airflow control parameter at the time of construction, it will operate with the optimal constant airflow control parameter, so when the installer changes the connection direction of the ventilation unit, There is an effect that the device can be operated with an optimum air volume.

  Further, the switching of the ventilation air volume control parameter may be set in advance by the operator by operating the controller. As a result, since the installer changes the ventilation air flow control parameter switching setting only by operating the controller during construction, when the installer changes the connection direction of the ventilation unit, the optimum wind direction mode can be easily set. There is an effect that it can be selected.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, a compressor 2 as a heating means for the bathroom and a first heat exchanger 3 for supplying heat energy to the bathroom are installed inside a box-shaped main body 1 installed behind the ceiling of the bathroom. A second heat exchanger 4 that exchanges heat with air sucked from another room, a circulation fan motor 5 that warms the air sucked from the bathroom through the first heat exchanger, and returns the air to the bathroom again, A circulation air passage 6 for circulating air in the bathroom, and a ventilation air passage adjusting means 7 for partitioning the bathroom and the second heat exchanger 4; By communicating with the heat exchanger 4, a bathroom ventilation air passage 9a and another room ventilation air passage 10a are formed.

  The ventilation unit 8 includes a ventilation fan motor 11 and an air volume control means 12, and includes a rotation speed detection means 12a, a current control means 12b, an operating air volume instruction means 12c, a pressure loss estimation means 12d, a wind direction setting storage means 12e, and an applied current storage means 12f. have.

  According to this configuration, as the ventilation air passage during heating operation, the air in the other room introduced from the other room air inlet 14 passes through the ventilation unit 8, passes through the bathroom ventilation air passage 9a, and then the second heat exchanger. The heat is taken away by the air, led to the other-room ventilation air passage 10a, returned to the ventilation unit 8 again, and discharged from the exhaust port 13 to the outdoors by the ventilation fan motor 11.

  A method in which the air volume control means 12 makes the ventilation air volume constant will be described with reference to FIGS.

  Based on the commanded air volume Q instructed by the operating airflow commanding unit 12c, the applied current I and the rotational speed N required for producing the commanded airflow Q instructed by the operating airflow commanding unit 12c, calculated by the pressure loss estimating unit 12d. The relationship (hereinafter referred to as a constant air volume control parameter curve) is compared with the applied current Ia applied to the ventilation fan motor 11 at a certain point of time and the rotational speed Na detected by the rotational speed detection means 12a, and the rotational speed is compared. The current control means 12b increases or decreases the applied current so that Na and the applied current Ia coincide with an arbitrary point on the constant air volume control parameter curve.

  The control flowchart is shown in FIG.

  For example, if constant air volume control is performed once every 3 seconds after the start of constant air volume control, the rotational speed detection means 12a is Na, the current control means 12b is Ia, and the operating air volume instruction means 12c is once every 3 seconds. Q is detected, and the pressure loss estimator 12d calculates a constant air volume control parameter curve.

  When Ia = I, if Na> N, the pressure loss estimation means 12d estimates that the duct pressure loss is large, and issues a command to the current control means 12b to increase the applied current applied to the ventilation fan motor 11. .

  Similarly, if Na <N, the pressure loss estimation means 12d estimates that the duct pressure loss is small, and issues a command to the current control means 12b to reduce the applied current applied to the ventilation fan motor 11.

  The above control is repeated every 3 seconds. When Ia = I, the current control means 12b increases or decreases the applied current so that Na = N.

  When the operation of the ventilation fan motor 11 is stopped, the application current storage unit 12f stores the application current applied immediately before the ventilation fan motor 11 stops in the application current storage unit 12f. Since the stored applied current is applied to the ventilation fan motor 11, the instructed air volume can be output immediately if there is no change in conditions such as the external wind pressure. When the ventilation fan motor 11 is started for the first time, a temporary applied current is stored in the applied current storage unit 12f. If the temporary applied current is set to a current value that preferably assumes a duct pressure loss of a straight pipe equivalent length of 10 m to 20 m, the target air volume can be quickly reached when actually installed on the ceiling.

  As shown in FIG. 4, when heating the bathroom, the compressor 2 (not shown), the circulation fan motor 5 and the ventilation fan motor 11 are driven, and the ventilation air path adjusting means 7 controls the ventilation from the bathroom. Since it is not performed, it is closed. Thereby, the heat energy recovered by the second heat exchanger 4 is put into the bathroom through the first heat exchanger 3.

  As shown in FIG. 5, when the bathroom is ventilated, the ventilation fan motor 11 is driven, and the ventilation air path adjustment means 7 is opened to ventilate the bathroom. Thereby, the humidity and smell of the bathroom are discharged to the outside through the ventilation fan motor 11.

  As shown in FIG. 6, the ventilation unit 8 can be attached even if it is inverted 180 degrees to the left and right. Therefore, the positional relationship between the exhaust port 13 and the other-chamber intake port 14 can be reversed, and the duct can be routed efficiently when constructing the unit bath or the like.

  According to this configuration, as the ventilation air passage during the heating operation, the air in the other room introduced from the other room intake port 14 passes through the ventilation unit 8 and is led to the other room ventilation air passage 10b, and then the second heat. Heat is taken away by the exchanger, passes through the bathroom ventilation air passage 9b, returns to the ventilation unit 8 again, and is discharged from the exhaust port 13 to the outside by the ventilation fan motor 11. Therefore, the flow of wind through the second heat exchanger 4 is opposite to that shown in FIG. 1, so that the characteristics of ventilation resistance and in-machine pressure loss change, and the optimal constant air volume control parameter also changes. Therefore, by storing the wind direction determined by the mounting direction of the ventilation unit 8 in the wind direction setting storage unit 12e, it is possible to select an optimal constant air volume control parameter for each wind direction, and the heat exchange air volume and ventilation during heating. The air volume can be secured with high accuracy.

  FIG. 7 shows a flowchart until the air volume control means determines the air direction and performs constant air volume control. When the installer performs an operation to turn on the wind direction setting mode of the controller 15 after the power is turned on, the LED of the controller 15 displays that the wind direction setting is a parallel flow. Here, the parallel flow is when the ventilation unit 8 is attached as shown in FIG. FIG. 8 explains the parallel flow.

  When the attachment direction of the ventilation unit 8 is reversed 180 degrees to the left and right as shown in FIG. 6, the installer operates the controller 15 to set the wind direction setting mode to the counter flow. FIG. 9 illustrates the counter flow.

  After completing the wind direction setting, the ceiling-embedded bathroom air conditioner shifts to the standby mode. Thereafter, when a command for operating the ventilation fan motor 11 such as heating operation or ventilation operation is turned ON, the remaining time timer starts counting and the wind direction setting is read at the same time. That is, when the wind direction setting is parallel flow, the air volume control unit 12 is activated in the parallel flow mode, and when it is counter flow, the air flow control unit 12 is activated in counter flow.

  Next, if the command is a heating operation, the ventilation air path adjusting means 7 is closed. If the command is other than the heating operation such as a ventilation operation, the ventilation air path adjusting means 7 is opened, and then the commanded target air volume Q is set. The ventilation fan motor 11 is activated by recognizing and applying the applied current stored in the wind direction setting storage means 12e to the ventilation fan motor 11. Thereafter, the constant air volume control operation shown in FIG. 3 is started.

  In the embodiment, an air path switching damper (not shown) is provided between the main body 1 and the ventilation unit 8 and also inside the ventilation unit 8 to adjust the balance of the ventilation air volume in the bathroom and other rooms. Is effective. Further, the air volume control means 12 has the same effect when it is provided not in the configuration provided in the ventilation unit 8 but also in the main body 1.

(Embodiment 2)
Next, Embodiment 2 of the bathroom ventilation drying apparatus according to the present invention will be described.

  The main components of the bathroom ventilation drying apparatus of the second embodiment are the same as those of the first embodiment as shown in FIG. 1, and the description of the same parts as those shown in FIG. 1 is omitted.

  As shown in FIG. 10, instead of the airway mode switching operation performed by the controller 15 using the controller 15, for example, when the airflow direction sensor 16 is attached in the other-room ventilation airway 10a, the airflow direction is automatically determined and the optimum. It can be operated with a constant air volume parameter.

  The ceiling-embedded bathroom air conditioner according to the present invention enables high-precision constant air volume control even when the mounting direction of the ventilation unit is changed. Alternatively, any device that can change the intake direction can be used for ventilation operation of a ceiling-embedded ventilation fan or a heat exchange air unit.

DESCRIPTION OF SYMBOLS 1 Main body 2 Compressor 3 1st heat exchanger 4 2nd heat exchanger 5 Circulation fan motor 6 Circulation air path 7 Ventilation air path adjustment means 8 Ventilation unit 9a Bathroom ventilation air path 9b Bathroom ventilation air path 10a Other room ventilation Air path 10b Other room ventilation air path 11 Ventilation fan motor 12 Air volume control means 12a Speed detection means 12b Current control means 12c Operating air volume instruction means 12d Pressure loss estimation means 12e Wind direction setting storage means 12f Applied current storage means 13 Exhaust port 14 Others Air inlet 15 Controller 16 Air direction sensor

Claims (5)

A circulation air passage that blows out air sucked from the bathroom by the circulation fan motor to the bathroom again, and a bathroom ventilation air passage and other rooms that draws air from the bathroom and other rooms other than the bathroom by the ventilation fan motor and discharges them outside. A rotation speed detecting means for detecting and controlling the rotation speed of the ventilation fan motor, a current control means for detecting and controlling an applied current of the ventilation fan motor, and an operating air volume of the ventilation fan motor. An instructing air volume indicating means; a pressure loss estimating means for estimating a pressure loss value of the exhaust duct based on a relationship between the rotational speed of the ventilation fan motor, an applied current and the air volume; and the current control means based on the estimated pressure loss value The ventilation fan motor is controlled so that the ventilation air flow is constant by the above, and the bathroom ventilation air passage is changed by changing the mounting direction of the ventilation unit. It reversed the wind direction of the air passing through, ceiling bathroom air conditioner and switches the ventilation power control parameter by the wind direction. It has a compressor as a heating means in the bathroom, performs heat exchange with the air sucked from the other room by a second heat exchanger installed in the bathroom ventilation air passage, and is installed in the circulation air passage. Heat energy is supplied to the bathroom via a heat exchanger, and the direction of the air passing through the second heat exchanger is reversed by changing the mounting direction of the ventilation unit, and the ventilation air volume control parameter is switched depending on the wind direction. The ceiling-embedded bathroom air conditioner according to claim 1. 3. The ventilation air volume control parameter is switched by determining the air direction with a wind direction sensor attached to any one of a bathroom ventilation air channel, another room ventilation air channel, and a ventilation unit. Embedded ceiling air conditioner. 3. The ceiling-embedded bathroom air conditioner according to claim 1 or 2, wherein the switching of the ventilation air volume control parameter is manually set in advance by a contractor. 5. The bathroom air conditioner according to claim 4, wherein the switching of the ventilation air volume control parameter is set in advance by an operator by operating the controller.

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