JP2912696B2 - Air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of a blower of a duct-type air conditioner, which controls a room temperature by controlling a flow rate of each air conditioning room, and has a flow rate adjustment unit in a duct. It is about.

2. Description of the Related Art Recently, individual air conditioning systems have been widely used for air conditioners used for buildings and the like because of their energy saving. In such a background, a duct-type air conditioner using a variable air volume unit that adjusts the air volume supplied to each air-conditioned room and controls the room temperature is often used.

 Hereinafter, a conventional example will be described with reference to the drawings.

FIG. 4 is a schematic diagram showing an example of a conventional air conditioner. Reference numeral 1 denotes an indoor unit main body, which includes a variable-speed indoor blower 2, a blower controller 2a for controlling the rotational speed of the indoor blower 2, an indoor heat exchanger 3, and an indoor expansion valve for expanding refrigerant. 4 is provided. 5 is an outdoor unit body and a compressor inside
6, an outdoor heat exchanger 7, an outdoor blower 8, and an outdoor expansion valve 9, the compressor 6, the outdoor heat exchanger 7, and an outdoor electric expansion valve.
9, the indoor heat exchanger 3 and the indoor electric expansion valve 4 constitute a well-known refrigeration circuit.

A main duct 11 is provided from the indoor blower 2 to the branch chamber 10, and branch ducts 15, 16, and 17 are provided from the branch chamber 10 to the air-conditioned rooms 12, 13, and 14, respectively. In the middle of the branch ducts 15, 16, 17 are mounted variable air volume units 18, 19, 20, respectively. The variable air volume units 18, 19, 20 each have a damper 18a,
Motors for driving the dampers 19a, 20a and the dampers 18a, 19a, 20a
18b, 19b, and 20b, and air flow controllers 18c, 19c, and 20c that control the motors 18b, 19b, and 20b. The air-conditioned room 1
Inside 2,13,14, a temperature controller 2 also having indoor temperature setting devices 21a, 22a, 23a and indoor temperature detectors 21b, 22b, 23b inside.
1,22,23 are arranged.

Further, a static pressure detector 25 for detecting a static pressure in the duct in the branch chamber 10 and a static pressure setting device 25a are provided.

Next, the operation will be described. The temperature or cool air blown out from the indoor unit main body 1 passes through the main duct 11 and is diverted in the branch chamber 10, and then the air-conditioned rooms are cooled.
The branch ducts 15, 16, and 17 are guided to 12, 13, and 14, respectively. The variable air volume units 18, 19, 20 provided in the middle of the branch ducts 15, 16, 17 are provided with the temperature set by the indoor temperature setting devices 21a, 22a, 23a in the temperature controllers 21, 22, 23. The motors 18b, 19b, and 20b are driven via the air volume controllers based on the difference from the temperatures detected by the indoor temperature detectors 21b, 22b, and 23b, and the damper 1 is driven.
The opening degrees of 8a, 19a, and 20a are changed to change the passing air volume.

When the air volume changes in the variable air volume units 18, 19, 20, the external static pressure inside the branch chamber 10 changes, and the static pressure detector 25 catches the change, and the blower controller 2a
In order to set the external static pressure to the value set by the static pressure setting unit 25a, the rotation speed of the indoor blower 2 is controlled.

Here, the set value P ₀ by the static pressure setter 25a, the each variable air volume unit 18, 19, 20 is set to be the static pressure in the case of each draw up air volume.

However, in the above-described configuration, in the above-described configuration, the sum of the duct pressure loss at the maximum air flow, the pressure loss at the variable air volume unit, the pressure loss at the blowout, etc., that is, the external static pressure at the maximum air volume, Although the static pressure is not set as the duct design in many cases, the air pressure and the external static pressure must be checked and the external static pressure set during the trial operation of the air conditioner. However, there is a problem that the adjustment takes a very long time.

In view of the above problems, the present invention provides an air conditioner that can detect the required external static pressure by itself during a test operation, and can greatly reduce the time required to adjust the external static pressure during a test operation. It is.

Means for Solving the Problems Therefore, the present invention provides an indoor unit main body having a rotational-speed-controlled indoor-side blower, a duct for guiding cool air or warm air from the indoor unit main body to the room to be air-conditioned, and A variable air flow unit provided to change a passing air flow according to a difference between a set temperature of the room to be air-conditioned and a room temperature; and a static air pressure unit for detecting a static pressure in the duct between the indoor unit main body and the variable air flow unit. A pressure detector, a static pressure setter that stores a set static pressure, and the indoor-side blower such that the static pressure detected by the static pressure detector during the cooling / heating operation becomes the set static pressure of the static pressure setter. In an air conditioner including a blower controller that controls the number of revolutions, when the test operation mode is set, the passing airflow is maximum until the airflow blown out from the indoor unit main body reaches a previously regulated maximum passing airflow. So that One
The variable air volume unit is configured so that the passing air volume does not exceed the maximum passing air volume, and when the test operation mode is set, the blower control is performed so as to increase the rotation speed of the indoor blower by a predetermined rotation speed. Constituting a device, while recording the relationship between the static pressure detected by the static pressure detector and the rotational speed of the indoor blower when the rotational speed of the indoor blower is changed to the test operation mode, The static pressure detected by the static pressure detector at the point where the change in the static pressure detected by the static pressure detector suddenly increases with respect to the change in the rotation speed of the indoor side blower is set in the static pressure setting device. A static pressure controller for storing the pressure was provided.

According to the configuration described above, in the air conditioner of the present invention, when the test operation mode is set, after the airflow passing through the variable airflow unit is maximized, the rotation speed of the indoor-side blower is increased by a predetermined rotation speed, At this time, the relationship between the static pressure detected by the static pressure detector and the rotation speed of the indoor blower is recorded, and the change in the static pressure detected by the static pressure detector rapidly changes with the change in the rotation speed of the indoor blower. Since the static pressure detected by the static pressure detector at the point where the static pressure becomes large is stored in the static pressure setting device as the set static pressure, an appropriate set static pressure can be automatically set during the test operation.

Embodiment FIG. 1 is a schematic diagram showing the configuration of an embodiment of the present invention, which will be described below with reference to the drawings. Components having the same configuration as in the conventional example are denoted by the same reference numerals, and detailed description is omitted.

In one embodiment of the present invention, a test operation switch (not shown) for forcibly performing a test operation, a rotation speed of the indoor blower 2 whose rotation speed is controlled by the blower controller 2a, and a static pressure storing the relationship between the static pressure P ₁ detected by the detector 25, and a static pressure controller 27 for storing the change point of the rotation speed and the static pressure of the relational curve.

Next, the operation will be described with reference to FIGS.

When the operation switch is switched to the test operation mode after turning on the power to the indoor unit main body 1, the blower controller 2a operates the indoor blower 2 to gradually increase the rotation speed. At this time, the static pressure controller 27 simultaneously controls the static pressure P ₁ detected by the static pressure detector 25 and the indoor blower 2.
Storing the rotational speed at the wheel of the relationship curve between the detected static pressure and operating speed, significantly as read detection static pressure P ₀ of the point where the change storage. Relationship detected static pressure P ₁ and the rotational speed N, 4
As shown in the figure, the air volume blown out from the indoor unit main body 1 is:
The dampers 18a, 19a, 20a of the variable air volume units 18, 19, 20 remain fully open until the respective regulated maximum air volumes of the variable air volume units 18, 19, 20 are reached. When it comes to the above, the dampers 18a, 19a, 20a
Means that the dampers 18a, 19a, and 20a close to maintain the maximum air volume of each of the variable air volume units 18, 19, and 20.
Relationship ₁ -N, the up致Ru the rotational speed N ₀ in, what has changed almost proportionally, rapidly detected static pressure P ₁ is increased becomes more than the rotational speed N _0. Detection static pressure P ₀ for the rotational speed N ₀
Is the optimum external static pressure (set static pressure P ₀ ) in this duct system. The point at which the P ₁ -N ₁ relationship changes greatly changes depending on the external static pressure, which is the total pressure loss such as the pressure loss of the duct and the pressure loss of the outlet.

The static pressure setting unit 25a stores the detected static pressure P ₀ stored in the static pressure controller 27 as the set static pressure P ₀ .

When operating in this test operation mode, the variable air volume units 18, 19, and 20 are all provided with dampers 18a,
19a and 20a are fully opened.

Next, switch to the cooling / heating operation with the trial run switch 28,
When performing a normal air-conditioning operation, similarly to the conventional example, even if the air volume changes in the variable air volume units 18, 19, and 20, the set static pressure P ₀ set in the test operation mode described above and the static pressure detector so that the detection static pressure P ₁ detected by the 25 match, the blower controller 2a controls the rotation speed of the indoor blower 2.

As described above, according to the present embodiment, the indoor unit main body 1 having the rotational speed control type indoor side blower 2 and the main duct for guiding the cool air or the warm air from the indoor unit main body 1 to the air-conditioned rooms 12, 13, and 14 are provided. 11 and branch ducts 15, 16, 17 and opening of the dampers 18a, 19a, 20a provided in the middle of the branch ducts 15, 16, 17 according to the difference between the set temperature of the conditioned rooms 12, 13, 14 and the room temperature. The variable air flow units 18, 19, and 20 that change the passing air flow by changing the degree and the static pressure that detects the static pressure in the duct in the branch chamber 10 between the indoor unit body 1 and the variable air flow units 18, 19, and 20 Pressure detector 25,
A static pressure setter 25a that stores a set static pressure, and a rotation speed of the indoor blower 2 is controlled such that a static pressure detected by the static pressure detector 25 during the cooling / heating operation becomes the set static pressure of the static pressure setter 25a. In the air conditioner equipped with the blower controller 2a, when the test operation switch 28 is set to the test operation mode, the passing air volume is maximum until the air volume blown out from the indoor unit main body 1 reaches the previously regulated maximum passing air volume. Variable air volume unit 1 so that the air volume does not exceed the maximum air volume
The blower controller 2a is configured to control the dampers 18a, 19a, and 20a of 8, 19, and 20 and to increase the rotation speed of the indoor-side blower 2 by a predetermined rotation speed when the test operation mode is set. The relationship between the static pressure detected by the static pressure detector 25 when the rotation speed of the indoor blower 2 is changed in the mode and the rotation speed of the indoor blower 2 is recorded, and the rotation speed of the indoor blower 2 is recorded. Static pressure control that stores the static pressure detected by the static pressure detector 25 at the point where the change in the static pressure detected by the static pressure detector 25 suddenly increases with respect to the change in the static pressure setter 25a as the set static pressure The test run switch
If the test operation mode is set at 28, the static pressure controller 27 automatically sets an appropriate set static pressure in the static pressure setting device 25a, so that it does not require much time for adjustment as in the related art.

Effects of the Invention As described above, in the present invention, an indoor unit main body having a rotational-speed-controlled indoor-side blower, a duct for guiding cool air or warm air from the indoor unit main body to the room to be air-conditioned, and a middle of the duct A variable air volume unit that is provided in the air-conditioned room and changes a passing air volume according to a difference between a set temperature and a room temperature,
A static pressure detector that detects a static pressure in the duct between the indoor unit main body and the variable air volume unit, a static pressure setter that stores a set static pressure, and a static pressure detector that detects the air conditioner during a cooling / heating operation. An air conditioner comprising: a blower controller for controlling a rotation speed of the indoor-side blower such that a static pressure to be applied becomes the set static pressure of the static pressure setter. The variable air volume unit is configured such that the air volume blown out from the main body is the maximum air flow volume regulated in advance so that the air flow volume becomes maximum, and the air flow volume does not exceed the maximum air flow volume. When the test operation mode is set, the blower controller is configured to increase the rotation speed of the indoor blower by a predetermined rotation speed, and the rotation speed of the indoor blower changes in the test operation mode. While recording the relationship between the static pressure detected by the static pressure detector and the rotational speed of the indoor blower, the static pressure detected by the static pressure detector with respect to a change in the rotational speed of the indoor blower. Since the static pressure detected by the static pressure detector at the point where the change of the sudden increase becomes large is provided with a static pressure controller that stores the static pressure as the set static pressure in the static pressure setter, without complicating the configuration, During test operation, an appropriate set static pressure can be automatically set.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of the configuration of an air conditioner according to an embodiment of the present invention, FIG. 2 is a control block diagram of the air conditioner of FIG. 1, FIG. 3 is a control flowchart of FIG. FIG. 4 is a graph showing the relationship between the rotational speed of the blower and the detected static pressure.
The figure is a conceptual diagram of the configuration of a conventional air conditioner. 1 ... indoor unit main body, 2 ... indoor side blower, 11, 15, 16, 17
…… duct, 25 …… static pressure detector, 27 …… static pressure controller, 2a
…… Blower controller.

Claims (1)

(57) [Claims] 1. An indoor unit main body having a rotational speed control type indoor side blower, a duct for guiding cool air or hot air from the indoor unit main body to a room to be air-conditioned, and a duct provided in the middle of the duct for the air-conditioned room. A variable air volume unit for changing a passing air volume according to a difference between a set temperature and a room temperature; a static pressure detector for detecting a static pressure in the duct between the indoor unit main body and the variable air volume unit; A static pressure setter for storing pressure, and a blower control for controlling the number of revolutions of the indoor-side blower such that the static pressure detected by the static pressure detector during the cooling / heating operation becomes the set static pressure of the static pressure setter. In the air conditioner including the air conditioner, when the test operation mode is set, the passing air volume is maximized until the air volume blown out from the indoor unit main body reaches a predetermined maximum passing air volume, and The air volume is the maximum passing wind Configuring the variable air volume unit so as not to exceed the amount, and configuring the blower controller to increase the rotation speed of the indoor blower by a predetermined rotation speed when the test operation mode is set, Record the relationship between the static pressure detected by the static pressure detector and the rotational speed of the indoor blower when the rotational speed of the indoor blower is changing to the test operation mode,
The static pressure detected by the static pressure detector at the point where the change in the static pressure detected by the static pressure detector suddenly increases with respect to the change in the rotation speed of the indoor side blower is set in the static pressure setting device. An air conditioner comprising a static pressure controller for storing pressure.