JP2008076026A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner provided with a bypass air suction port, allowing reduction of adjustment cost and stabilization of performance of the air conditioner by uniformly controlling the airflow passing a cooling coil. <P>SOLUTION: This air conditioner is provided with: the bypass air suction port 7 taking air into a casing 3 without passing the cooling coil 4; and a blower control circuit 10 provided with a flow regulating valve 8 adjusting an opening of the bypass air suction port 7, detecting a differential pressure ΔP between a pressure P1 of an upstream-side flow passage and a pressure P2 of a downstream-side flow passage of the cooling coil 4, and controlling output of a blower 6 such that the airflow passing the cooling coil becomes uniform on the basis of the differential pressure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a precision air conditioner, and in particular, in an air conditioner provided with a bypass air inlet, the air volume passing through a cooling coil is controlled to be constant, thereby stabilizing the performance of the air conditioner and reducing adjustment costs. It is related with the air conditioner which can be.

  Conventionally, an air conditioner includes, for example, a housing in which an air suction port and an air discharge port are formed, a cooling coil disposed in the air suction port, an electric heater disposed on the downstream side of the cooling coil, An air blower that discharges the air in the housing from the air discharge port and a temperature sensor that is disposed in the air discharge port. The heater is precisely adjusted to the set temperature and discharged from the air outlet.

By the way, in such an air conditioner, for example, when the air volume is doubled, the cooling coil, its refrigerator, and the electric heater are each changed to double capacity.
However, in this type of air conditioner, the temperature is precisely adjusted by heating the outside air once cooled by the cooling coil with the electric heater on the downstream side. Therefore, the cooling coil and the electric heater operate even under the outside air condition without a cooling load. If the cooling coil and the electric heater are enlarged according to the air volume as described above, an excessive cooling capacity and a reheating capacity are mounted, so that both initial cost and running cost are wasted.
In addition, when the outside air temperature is greatly reduced or the water supply temperature to the refrigerator is greatly reduced, the cooling capacity may be excessive and freezing may occur in the cooling coil section.

Therefore, the applicant of the present invention previously invented an air conditioner adapted to cope with an increase in air volume without increasing the size of a cooling coil, a refrigerator, or an electric heater.
As shown in FIG. 3, the air conditioner includes a housing 3 in which an air inlet 1 and an air outlet 2 are formed, a cooling coil 4 disposed in the air inlet 1, and a downstream of the cooling coil 4. In an air conditioner including an electric heater 5 disposed on the side and a blower 6 that discharges air in the housing 3 from the air discharge port 2, bypass for taking air into the housing 3 without passing the cooling coil 4 An air inlet 7 and a flow rate adjusting valve 8 for adjusting the opening degree of the bypass air inlet 7 are provided.
This air conditioner can increase the amount of air flowing out of the air outlet 2 by adjusting the amount of air passing through the cooling air coil 4 and adjusting the amount of air passing through the bypass air inlet port 7. It is possible to cope with an increase in the air volume without increasing the size of the refrigerator 4, the refrigerator 9, and the electric heater 5, thereby saving energy and reducing the initial cost and running cost of the air conditioner.
In addition, even when the outside air temperature is greatly reduced or the water supply temperature to the refrigerator is greatly reduced, the air volume at the bypass air inlet 7 is reduced and the air volume passing through the cooling coil 4 is increased to reduce the cooling air. By preventing freezing in the coil section and making the necessary air volume constant, the heat load is made constant and the refrigerator 9 can be operated stably.

By the way, in this air conditioner, the setting of the amount of air flowing out from the air outlet is performed by manually adjusting the output frequency of an inverter (not shown) of the blower.
At the same time, in order to set the amount of air passing through the cooling coil, the opening degree of the flow rate adjustment valve of the bypass air intake port is adjusted. While adjusting the output of the inverter, it was very difficult to adjust the air volume passing through the cooling coil to be constant.

  In view of the problems of the conventional air conditioner, the present invention stabilizes and adjusts the performance of the air conditioner by controlling the air volume passing through the cooling coil to be constant in the air conditioner provided with the bypass air inlet. An object is to provide an air conditioner capable of reducing costs.

  In order to achieve the above object, an air conditioner according to the present invention includes a casing in which an air inlet and an air outlet are formed, a cooling coil disposed in the air inlet, and air in the casing from the air outlet. In the air conditioner provided with a blower for discharging air, a bypass air intake port for taking air into the housing without passing through the cooling coil, a flow rate adjusting valve for adjusting the opening degree of the bypass air intake port, and cooling are provided. Blower control that detects the differential pressure between the upstream flow path pressure and the downstream flow path pressure of the coil, and controls the output of the blower based on the differential pressure so that the amount of air passing through the cooling coil is constant. A circuit is provided.

  In this case, the amount of air discharged from the air discharge port can be adjusted by the opening degree of the flow control valve.

  According to the air conditioner of the present invention, a casing in which an air inlet and an air outlet are formed, a cooling coil disposed in the air inlet, and a blower that discharges air in the casing from the air outlet. An air conditioner having a bypass air intake port for introducing air into the housing without passing through the cooling coil, a flow rate adjusting valve for adjusting the opening degree of the bypass air intake port, and an upstream side flow of the cooling coil A fan control circuit is provided that detects a differential pressure between the pressure of the passage and the pressure of the downstream flow path, and controls the output of the blower based on the differential pressure so that the amount of air passing through the cooling coil is constant. When setting the air volume coming out of the air discharge port, the output of the blower is automatically controlled based on the differential pressure between the pressure of the upstream flow path and the downstream flow path of the cooling coil, and the air flow passing through the cooling coil is reduced. This can be constant, Ri, to facilitate adjustment of the opening degree of the flow control valve, it is possible to reduce the stabilization and adjustment costs of the performance of the air conditioner.

  In this case, by adjusting the air discharge amount from the air discharge port by the opening degree of the flow rate control valve, the air flow set by the air conditioner can be adjusted while the air flow rate of the cooling coil is constantly controlled by the blower. it can.

  Embodiments of an air conditioner according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the air conditioner of the present invention.
This air conditioner includes a housing 3 in which an air inlet 1 and an air outlet 2 are formed, a cooling coil 4 disposed in the air inlet 1, and an electric disposed downstream of the cooling coil 4. A heater 5 and a blower 6 for discharging the air in the housing 3 from the air discharge port 2 are provided.
The air conditioner is provided with a bypass air suction port 7 for taking air into the housing 3 without passing through the cooling coil 4, and a flow rate adjusting valve 8 for adjusting the opening degree of the bypass air suction port 7. The differential pressure ΔP between the pressure P1 in the upstream flow path of the coil 4 and the pressure P2 in the downstream flow path is detected, and based on this differential pressure, the output of the blower 6 so that the amount of air passing through the cooling coil is constant. A blower control circuit 10 is provided for controlling the above.

  In the air conditioner, a refrigerator 9 that operates the cooling coil 4 is installed on the lower side of the housing 3, and the air inlet 1 is formed in the lower portion of the housing 3.

A cooling coil 4 is disposed on the downstream side of the air inlet 1, and an electric heater 5 is disposed on the downstream side of the cooling coil 4 as a reheater.
In this case, it can replace with the electric heater 5 as a reheater, and can also use the reheater which consists of heaters, such as a warm water heater and a steam heater, and a refrigerant | coolant reheat coil system.
In addition, the reheater which consists of this electric heater 5 grade | etc., Is not essential, and does not provide the reheater which consists of electric heaters 5 grade | etc., Like the modification of the air conditioner of this invention shown in FIG. The present invention does not exclude such an air conditioner.

An air discharge port 2 is formed on the upper surface of the housing 3, and a blower 6 that discharges air taken from the air intake port 1 is installed in the air discharge port 2.
A temperature sensor (not shown) is installed at an appropriate location on the downstream side of the blower 6 (appropriate location on the downstream side of the air inlet 1 in the case of the modified embodiment shown in FIG. 2). Based on the temperature of the air detected by the sensor and the set temperature, the output of the cooling coil 4 and the electric heater 5 as a reheater is controlled (in the case of the modified embodiment shown in FIG. 2, the cooling coil 4 and the refrigerator 9 Control the output).

The bypass air suction port 7 is installed on the same side as the air suction port 1 at the top of the housing 3, and the bypass air suction port 7 includes a flow rate adjusting valve 8 that adjusts the opening degree thereof.
The flow rate adjustment valve 8 manually adjusts the opening degree of the flow rate adjustment valve 8 manually when setting the air volume setting air volume, that is, the air discharge amount from the air discharge port.
As a result, the set air volume of the air conditioner can be adjusted while the blower 6 controls the air volume of the cooling coil 4 to be constant.

  In this embodiment, the bypass air suction port 7 is provided on the same side as the air suction port 1 and on the upper portion of the housing 3. However, the position of the bypass air suction port 7 is not particularly limited to this position. Alternatively, it may be provided on the opposite side or near side of the air inlet 1.

The blower control circuit 10 detects the differential pressure ΔP between the pressure P1 in the upstream flow path and the pressure P2 in the downstream flow path of the cooling coil 4, and based on the detected value of the differential pressure gauge 41, And an adjuster 11 for controlling the output frequency of an inverter (not shown), and by automatically feeding back the pressure loss of the cooling coil 4, the output of the blower 6 is automatically controlled so that the amount of air passing through the cooling coil 4 is constant. To do.
When the passing air volume of the cooling coil 4 is large, the differential pressure ΔP increases. Conversely, when the passing air volume is small, the differential pressure ΔP decreases.
Thereby, even when the air volume setting of the air conditioner is set or changed, the cooling coil 4 is based on the differential pressure ΔP between the pressure P1 of the upstream flow path and the pressure P2 of the downstream flow path of the cooling coil 4. The output of the blower 6 can be automatically controlled so that the amount of air passing through the air becomes constant.

Next, the operation of the air conditioner of the present embodiment will be described.
When the set temperature and air volume are set and the air conditioner is turned on, the blower 6 is driven, and the blower control circuit 10 feeds back the pressure loss of the cooling coil 4 so that the passing air volume of the cooling coil 4 becomes constant. The output of the blower 6 is automatically controlled.
In this case, the amount of air discharged from the air discharge port 2 is the same as the amount of air set by the air conditioner while the air flow rate of the cooling coil 4 is controlled to be constant by the blower 6 by manually adjusting the opening degree of the flow control valve 8. Make adjustments.

In actual operation, the outside air introduced from the bypass air inlet 7 is at the same temperature, and the outside air introduced from the air inlet 1 is temperature-controlled by the cooling coil 4 and the electric heater 5.
The air introduced from the air inlet 1 and the bypass air inlet 7 is mixed in the housing 3 and sent to a clean booth or the like through the air outlet 2. Omitted) detects the temperature of the mixed air.
Then, the electric heater 5 is controlled so that the temperature detected by the temperature sensor becomes the set temperature.

  Thus, the air conditioner according to the present embodiment includes the housing 3 in which the air inlet 1 and the air outlet 2 are formed, the cooling coil 4 disposed in the air inlet 1, and the downstream side of the cooling coil 4. In an air conditioner provided with an arranged electric heater 5 and a blower 6 that discharges air in the housing 3 from the air discharge port 2, bypass air suction for taking air into the housing 3 without passing through the cooling coil 4 And a flow rate adjusting valve 8 for adjusting the opening degree of the bypass air suction port 7, and a differential pressure ΔP between the pressure P 1 in the upstream flow path and the pressure P 2 in the downstream flow path of the cooling coil 4. Based on this differential pressure ΔP, a blower control circuit 10 is provided to control the output of the blower 6 so that the amount of air passing through the cooling coil 4 is constant, so that the amount of air flowing out from the air outlet 2 is set. The pressure P1 of the upstream flow path of the cooling coil 4 The output of the blower 6 is automatically controlled based on the differential pressure ΔP between the pressure P2 and the downstream flow path pressure P2, and the amount of air passing through the cooling coil 4 can be made constant. Adjustment can be facilitated, performance of the air conditioner can be stabilized, and adjustment costs can be reduced.

  In this case, the amount of air discharged from the air discharge port 2 is adjusted by adjusting the opening degree of the flow control valve 8 so that the air flow through the cooling coil 4 is controlled to be constant by the blower 6 and the set air volume of the air conditioner is adjusted. It can be performed.

  As mentioned above, although the air conditioner of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, The structure is suitably changed in the range which does not deviate from the meaning. be able to.

  The air conditioner of the present invention is small in size because it can stabilize the performance of the air conditioner and reduce the adjustment cost by controlling the air volume passing through the cooling coil to be constant in the air conditioner provided with the bypass air suction port. Therefore, it can be suitably used as a low-cost, energy-saving precision air conditioner.

It is sectional drawing which shows one Example of the air conditioner of this invention. It is sectional drawing which shows the modification Example of the air conditioner of this invention. It is sectional drawing which shows an example of the air conditioning apparatus which concerns on this inventor's invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air inlet 2 Air outlet 3 Housing | casing 4 Cooling coil 41 Differential pressure gauge 5 Electric heater 6 Blower 7 Bypass air inlet 8 Flow control valve 9 Refrigerator 10 Blower control circuit 11 Controller

Claims (2)

  A cooling coil in an air conditioner comprising: a housing in which an air inlet and an air outlet are formed; a cooling coil disposed in the air inlet; and a blower that discharges air in the housing from the air outlet. A bypass air intake port for taking air into the housing without passing through, and a bypass valve for adjusting the opening degree of the bypass air intake port, as well as the pressure in the upstream flow path and the pressure in the downstream flow path of the cooling coil The air conditioner is provided with a blower control circuit that detects an output pressure of the blower and controls an output of the blower based on the differential pressure so that the amount of air passing through the cooling coil is constant.   2. An air conditioner according to claim 1, wherein the air discharge amount from the air discharge port is adjusted by the opening degree of the bypass valve.

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