JPH02238228A - Air conditioner - Google Patents

Abstract

PURPOSE:To contrive the uniformity of the distribution of indoor temperature by perform the close operation of a damper for alternatively performing wind passage switching with the use of room thermostats for controlling in accordance with the difference between the set room temperature and a really measured room temperature. CONSTITUTION:For example, in the case where really measured room temperatures detected by each room thermostats 11a, 11b, 11c, 11d are lower than a set temperature, a damper 7 is controlled at the position shown by a full line to allow a hot wind passing a heat exchanger to pass through a main wind passage 4 so as to allow it to flow in each room through branched ducts from a duct connected opening 6. As the result, room temperature increases gradually. And in the case where the room temperature is equal to or higher than the set temperature, the damper 7 is controlled at the position shown by the full line to allow a wind passage to switch from the main wind passage 4 to a bypass wind passage 5. As shown in the above, a quantity of a wind flow for each room is always constant without the influence of heat load of each room and a proper quantity of a cold wind or a hot wind is allowed to flow in each room in accordance with the heat load.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an air conditioner, and in particular to a duct type air conditioner that can adjust the room temperature of multiple rooms individually and independently. It is related to.

[Prior Art] Conventionally, in a variable air volume (VAV) type air conditioner using a single duct, the number of air blowers is adjusted depending on the heat load of each room. As methods for this adjustment, there are a method using a diaphragm-type damper and a method using a bypass-type damper.

The former method, which uses a diaphragm-type damper, changes the air flow rate itself in proportion to the heat load in each room, while the latter method, which uses a bypass-type damper, changes the amount of cooled or warm air after heat exchange. The room temperature is controlled by either supplying the air to the room or directly supplying unreplaced air from the blower to the room. Furthermore, as another type, there is one in which the amount of air blown is adjusted by simply turning on and off the air supply using a two-position control type damper. Furthermore, there is also a device described in Japanese Patent Publication No. 37456/1983 in which a plurality of bypass dampers are collectively arranged downstream of a heat exchanger of an indoor unit.

Conventional air conditioners as mentioned above use a single heat exchanger to generate cold air during cooling operation and warm air during heating operation, and the amount of cold air or hot air blown varies. By adjusting the temperature, the room temperature in each room is controlled.

In addition to the above, there are also double duct type air conditioners. In this method, each indoor unit is equipped with a heating coil and a cooling coil, and two ducts blow cold air and hot air to a mixing box installed in each room. This system generates air at a certain temperature to regulate the room temperature.

[Problems to be Solved by the Invention] Among the conventional air conditioners as described above, in the system using a diaphragm-type damper, the air supply m is proportionally controlled in proportion to the indoor heat load. When the heat load was small, the air volume decreased and the speed of air blown into the room from the outlet also decreased.

For this reason, the distance that cold air or hot air can reach is shortened, and the air cannot be blown throughout the room, resulting in uneven temperature distribution in the room, especially during heating operation. In order to eliminate this problem, for example, even if the minimum opening degree of the damper is set and control is performed to ensure the minimum air volume, the indoor temperature cannot be controlled in this case, so control to change the air blowing temperature is performed. It was necessary to do it. However, in cases where a room with a large heat load and a room with a small heat load exist at the same time, the air temperature cannot be determined unambiguously, making it difficult to control the room temperature and the ventilation air volume at the same time.

Furthermore, in the system using a bypass type damper or a two-position control type damper, the air volume was constant when the damper was opened, and the indoor temperature distribution was better than in the system using a diaphragm type damper. However, even with these methods, when the heat load is small, the ratio of the time the damper is open decreases, and in order to ensure the minimum ventilation volume, it is necessary to set a lower limit for the ratio of the damper open time. there were. As a result, the same disadvantages as the above-mentioned method using the diaphragm type damper were caused.

Furthermore, in double-duct type air conditioners, room temperature is controlled by arbitrarily adjusting the ratio of cold air to hot air. Therefore, in this method, the total amount of air blown could always be kept constant, and a sufficient amount of ventilation air could be ensured.

However, because the duct has a double structure and also includes a mixing box, a large amount of heat loss occurs.

As described above, with conventional air conditioners, it is usually difficult to achieve both a uniform temperature distribution in the room and a sufficient air volume for ventilation. I had no choice but to use an air conditioner.

Therefore, the present invention allows room temperature to be well controlled over a wide range of heat load conditions with a simple process, and furthermore,
The object of the present invention is to provide an air conditioner that can ensure a sufficient amount of air flow (wind speed) into a room.

[Means for Solving the Problems] The air conditioner according to the present invention includes: a heat exchanger (3) that cools or heats air blown from a blower (2) that blows air for air conditioning; A main air passage (4) through which cold air or warm air that has passed through the exchanger (3) is passed through, and a main air passage (4) which has the same air capacity as the main air passage (4) and which directly blows the air blown from the blower (2). a damper () that selectively switches the air path between the bypass air path (5) and the main air path (4);
7), and a room thermostat (11) controls the opening/closing operation of the damper (7) according to the difference between the set room temperature and the measured room temperature.

[Function] In the air conditioner of this invention, the air blown from the blower (2) is cooled or heated by the heat exchanger (3), and the main wind/path (4) through which this cold air or warm air is passed. , a damper (7) that selectively switches the air path between the main air path (4) and a bypass air path (5) which has the same air blowing capacity and directly passes the air blown from the blower (2). Since the opening/closing operation is controlled by the room thermostat (11), which is controlled according to the difference between the set room temperature and the actual measured room temperature, the amount of air blown to each room is always constant without being affected by the heat load of each room. The appropriate amount of cold or warm air is blown into each room at the appropriate temperature.

[Embodiment] FIG. 1 is a cross-sectional view showing an air conditioner which is an example of the present invention, and FIG. 2 is a cross-sectional view showing the X--X cross section of the air conditioner shown in FIG.

In the figure, (1) is a housing that constitutes the outer shell of the indoor unit of this air conditioner, (2) is a blower that is disposed inside the housing (1) and blows air for air conditioning, and (3) is a blower ( 2) is a heat exchanger located on the outlet side. This heat exchanger (3) is connected to a heat source device (not shown) such as a heat bomb, and cools or heats the air blown from the blower (2). (4) is the main air passage through which cold or hot air passes through the heat exchanger (3), and (5) is the blower (
2), a bypass air passage that directly passes the air blown from (6) and (6a). (6b). (6c), (
6d) are duct connection ports (7), (7a), (7b), (7c), . (7d)
are each duct 1 connection port (6), (6a). (6b
)． (6c). (6d) every bypass air passage (5
) and the main air path (4). Each of these dampers (7a), (7b). (7c
). (7d) is connected to an opening/closing drive motor, etc. (not shown). (8) is an intake duct connected to the intake side of the blower (2), (9) is a ventilation duct connected to the intake duct (8) in a branched manner, and (10) is for adjusting the opening/closing degree of the ventilation duct (9). It is a ventilation damper. (11) and (l
la). (llb), (11・C). (lid) is a room thermostat provided in each room corresponding to each branch duct, and controls the opening/closing operation of the damper (7) according to the difference between the set room temperature and the measured room temperature. In addition, the bypass air path (
The cross-sectional area and shape are designed so that the air passage resistance 5) is equivalent to the resistance of the main air passage (4) and the heat exchanger (3) combined. That is, the main air path (4) and the bypass air path (5)
) are designed so that the air blowing capacity is the same.

The air conditioner of this embodiment is constructed as described above, with each room thermostat (lla). (llb). (
llc). (7a), (7b) so that the room temperature is set at the set temperature set by (lid). (7c). (7
d) is controlled in two positions. This will be explained using heating operation as an example.

For example, each room thermostat (1 1 a) (
When the actual room temperature detected by (llb), (llc), and (lid) is lower than the set temperature, the damper (7) is controlled to the position shown by the solid line in FIG. As a result, the warm air that has passed through the heat exchanger (3) passes through the main air path (4) and is blown into the room from the duct connection port (6) via the branch duct or the like. As a result, the room temperature gradually rises. Then, when this room temperature becomes higher than the set temperature, the first
The damper (7) is controlled to the position indicated by the dotted line in the figure, and the actual air passage is from the main air passage (4) to the bypass air passage (
5). As a result, the air blown from the blower (2) directly passes through the bypass air path (5) and passes through the duct 1.
- Air is blown into the room from the connection port (6) via a branch duct, etc. As a result, the room temperature gradually decreases.

In this way, in the air conditioner of this embodiment, the room temperature in each room is controlled by the room thermostat (lla) installed in each room.
). (llb). The set temperatures of (llc) and (1 1 d) are controlled so that they do not fluctuate by more than 20% within a constant range and remain approximately constant.

In addition, in this embodiment, the main air path (4) and the bypass air path (
5) are designed to have the same air capacity, so the amount of air supplied to each room via each branch duct is:
Dampers (7a), (7b). Regardless of the positions of (7c) and (7d), the same constant air volume is always maintained.

The hot air or cold air supplied to each room is circulated within each room to perform heating or cooling, and then is sucked into the air intake duct (8) again. Next, turn on the blower (2) again.
Air is blown into each room. Furthermore, this embodiment is equipped with a ventilation mechanism that can perform a ventilation operation at the same time as circulation. That is, by opening the ventilation damper (10), fresh air from outside is directed into the ventilation duct (
9) into the circulatory system. This fresh air is mixed with the air circulating in the circulation system and supplied to each room.

Exhaust air is naturally carried out through gaps such as windows in each room.

Air conditioners for buildings sometimes use dedicated intake/exhaust fans and heat exchangers for ventilation.

In the air conditioner of this embodiment, the rotational speed of the blower (2) is maintained constant in order to keep the amount of air blown to each room constant. However, the amount of air passing through the heat exchanger (3) is reduced by the damper (7a). (7b), (7c), (7d), so in order to keep the blowout temperature constant in each room, each damper (7a), (7b), (7c)
．． It is necessary to adjust the ability of the heat source device that controls the heat exchange operation of the heat exchanger (3) depending on the state of (7d).

As described above, the air conditioner of this embodiment includes a blower (2) that blows air for air conditioning, and a heat exchanger (3) that cools or heats the air blown from the blower (2).
, a main air path (4) through which cold or hot air that has passed through the heat exchanger (3) passes through, and air blown from the blower (2) that has the same air capacity as the main air path (4). a bypass air passage (5) that directly ventilates the air;
) and a main air path (4), and a room thermostat (7) that controls the opening/closing operation of the damper (7) according to the difference between the set room temperature and the measured room temperature.
11).

Therefore, the air blown from the blower (2) is cooled or heated by the heat exchanger (3), and there is a main air path (4) through which this cold air or warm air is passed, and this main air path (4) and the air blowing capacity. The damper ( 7
) is alternatively controlled according to the difference between the set room temperature of the room thermostat (11) and the actually measured room temperature.

Therefore, even when the heat load in each room is small as in the conventional case, the amount of air blown can always be maintained at a predetermined amount or more, and the speed of air blown from the air outlet of each room does not decrease. Further, since a predetermined distance of the cold air or warm air can be ensured, and the air can be blown throughout the room, the temperature distribution in the room can be made uniform. In this way, the amount of air blown to each room is always constant without being affected by the heat load of each room, and an appropriate amount of cold or warm air is blown to each room at an appropriate temperature depending on the heat load. Also,
The amount of air blown to each room can be set to a sufficient amount for ventilation. As a result, it is possible to achieve both a uniform temperature distribution in the room and a sufficient amount of air for ventilation, and because this can be achieved with a simple structure, extremely economical and stable air conditioning can be achieved.

By the way, in the above embodiment, there is a damper (7) inside the indoor unit.
．． (7a). (7b) , (7c) , (
7d) and which switches the air path between the main air path (4) and the bypass air path (5), it may be installed in the middle of the duct.

In addition, with this type of air conditioner, even during heating operation, a volume of air exceeding a predetermined amount is blown into each room from the outlet, which may give a feeling of cold air to people in the room, so change the location of the outlet. This is more effective considering its shape.

[Effects of the Invention] As explained above, the air conditioner of the present invention cools or heats the air blown from the blower with a heat exchanger, and has a main air path through which the cold air or hot air passes, and a main air passage from the blower. The simple configuration uses a room thermostat to control the opening and closing of the damper, which selectively switches between the bypass air path and the bypass air path that allows the blown air to pass through, according to the difference between the set room temperature and the actual room temperature. The amount of air blown to each room is always constant without being affected by the heat load of each room, and the appropriate amount of cold or warm air at the appropriate temperature is blown to each room according to the heat load, so the temperature distribution in the room can be adjusted. It is possible to achieve both uniformity and ensure sufficient air volume for ventilation, resulting in economical and stable air conditioning.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an air conditioner according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line XX of the air conditioner shown in FIG. In the figure, 2: Air blower 3: Heat exchanger 4: Main air path 5: Bypass air path 7: Damper 11: Room thermostat. Note that in the drawings, the same reference numerals and symbols indicate the same or equivalent parts. Agent: Patent attorney Masuo Oiwa, and two others, amended procedure for Figure 1 (voluntary) 5. Subject of amendment (1) Claims column of the specification (2) Detailed explanation of the invention column 1 of the specification, Case indication Japanese Patent Application No. 1-59963 2, Title of the invention Air conditioner 3, Representative of the person making the correction: Moriya Shiki 6. Contents of the amendment (1) The claims section of the specification will be amended as shown in the attached sheet. (2) "Adjusting" on page 2, line 9 of the specification is amended to "adjusting". (3) In the fifth to fourth lines from the bottom of the second page of the specification, amend the phrase ``supply from the blower'' to ``and then return it to the blower.'' (4) "Adjust the amount of air blowing" on page 3, line 7 of the specification is corrected to "adjust the amount of air blowing proportionally or on/off." (5) In the 6th line from the bottom of page 3 of the specification: ” is corrected to ``It was something that was done.'' (6) "Temperature distribution uniformity" in the ninth line from the bottom of page 5 of the specification is corrected to "temperature control." (7) Page 6, line 9 of the specification, page 12, lines 10 to 1
Correct "damper" in the first line to "multiple dampers". (8) Page 6, line 10, page 12, line 12 of the specification
"Room thermostat" on the 13th line is corrected to "multiple room thermostats". (9) "Damper" in the 9th line from the bottom of page 6 of the specification is corrected to "each damper." (10) "Intake duct, (9)" in the 8th line from the bottom of page 8 of the specification is replaced with "return air duct, (9)
) is corrected to "return air duct (8)". (11) “Intake duct” on page 11, line 1 of the specification
is corrected as "return air duct". (12) In the third to second lines from the bottom of page 14 of the specification, "to achieve uniform temperature distribution" is corrected to "temperature control." 7. List of attached documents (1) 1 document stating the full text of the amended scope of claims 2. Claims: A blower that blows air for air conditioning; a heat exchanger that cools or heats the air blown from the blower; and a main air path that passes cold or hot air that has passed through the heat exchanger. , a bypass air path that has the same air blowing capacity as the main air path and allows the air blown from the blower to pass through as is; and a plurality of dampers that selectively switch between the bypass air path and the main air path. and a plurality of room thermostats that control the opening and closing operations of each of the dampers according to the difference between a set room temperature and an actual room temperature.

Claims (1)

[Scope of Claims] A blower that blows air for air conditioning, a heat exchanger that cools or heats the air blown from the blower, and a main air that blows cold or hot air that has passed through the heat exchanger. a bypass air path that has the same airflow capacity as the main air path and allows the air blown from the blower to pass through as is; and a damper that selectively switches the air path between the bypass air path and the main air path. and a room thermostat that controls the opening/closing operation of the damper according to the difference between a set room temperature and an actual room temperature.