JP2003322386A - Heat-pump type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-pump type air conditioner to be used in a wide range from a cold district to a severely hot district. <P>SOLUTION: The air conditioner has an evaporator 2 constituting a refrigerant circulation circuit C, a condenser 3, two compressors 4, a supplied air draft duct A with the evaporator 2, and a condensation draft duct B with the condenser 3 inside a casing 1. The condenser 3 has two heating tube channels respectively connected to each compressor 4, and fins used together with the heating tube channels. A condensation fan 12 for adjusting the wind speed on the condenser face to be increased/reduced is mounted in the condensation draft duct B. The air conditioner also has a control means for controlling the wind speed on the condenser face and driving of the compressor by the condensation fan 12 according to the temperature at an intake of the compressor. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat pump type air conditioner.

[0002]

2. Description of the Related Art Conventionally, in a heat pump type air conditioner, outside air or the like is heat-exchanged by an evaporator to supply it indoors, and the refrigerant heat-exchanged by the evaporator is blown to a condenser. The heat is exchanged with air, but in that case, the air is blown to the condenser by using a blower with a constant air volume.

[0003]

Therefore, the capacity must be adjusted only by controlling the compressor, which limits its use in extremely cold regions and extremely hot regions. Then, it aims at providing the heat pump type | mold air conditioner which solves these problems.

[0004]

In order to achieve the above object, a heat pump type air conditioner of the present invention comprises an evaporator, a condenser and at least two compressors which constitute a refrigerant circulation circuit in a casing, and An air supply air passage provided with an evaporator, and a condensation air passage provided with the condenser, wherein the condenser is at least two heat transfer pipe paths each connected to the compressor in a one-to-one relationship, A fin group that is shared by these heat transfer pipe paths, and a condenser blower that can adjust the wind velocity of the condenser surface to be increased or decreased is provided in the condensation blow passage, and the condensation is performed according to the condenser inlet air temperature. And a control means for performing one or both of the condenser surface wind speed control and the compressor drive control by the blower for use. Furthermore, the compressor has a freely controllable capacity.
Furthermore, the refrigerant circulation circuit is configured so that it can be taken out and stored in the casing. Furthermore, the heat transfer tube path of the condenser is formed by an elliptical tube.

[0005]

1 and 2 show an embodiment of a heat pump type air conditioner of the present invention.
Inside the casing 1, an evaporator 2, a condenser 3 and at least two compressors 4 forming a refrigerant circulation circuit C, an air supply air passage A provided with the evaporator 2, and a condensing blower provided with the condenser 3 The road B is provided. In the casing 1, an air intake 7, an air supply port 8, a suction port 9 and an exhaust port 10 are formed, and the air intake 7 and the air supply port 8 are connected to each other through an air supply air passage A,
The suction port 9 and the exhaust port 10 are connected by a condensing air passage B. The air supply port 8 is communicatively connected to the interior through a duct or the like. The solid and dotted outline arrows indicate the wind direction (air flow direction).

The condenser 3 has at least two heat transfer tube paths 5 each connected to the compressor 4 in a one-to-one relationship, and a fin group 6 shared by these heat transfer tube paths 5. The heat transfer tube path 5 is formed by connecting, for example, a plurality of stages of meandering refrigerant flow tubes inserted into the fin group 6 with a header or the like. At least the air contact portion of the heat transfer tube path 5 of the condenser 3 is preferably formed of an elliptic tube having a low pressure loss (see FIG. 3), but a circular tube may be used. Further, the evaporator 2 can be freely constructed by a similar elliptic tube. An evaporation blower 11 is provided in the air supply air passage A,
The condensing blower path B is provided with a condensing blower 12 capable of increasing / decreasing the condenser surface wind speed (condenser passing air amount) by inverter control or the like.

D is a control means for performing one or both of the condenser surface wind speed control and the compressor drive control by the condensing blower 12 according to the condenser inlet air temperature. The compressor 4 can be operated or stopped only, or its capacity can be controlled by inverter control, etc.
It may have any of these functions. The refrigerant circulation circuit C is configured by connecting the evaporator 2, the condenser 3, the compressor 4, a liquid receiver (not shown), an expansion valve, a refrigerant circulation direction switching valve, and the like by piping, and the evaporator 2 and the condenser 3 are connected to each other. It can be configured to switch between heat absorption and heat dissipation.

Further, the refrigerant circulation circuit C is constructed so that it can be taken out and stored in the casing 1. For example, the refrigerant circulation circuit C is fixed and integrated to a frame 13 which is detachably mounted in the casing 1, an opening is formed on one surface of the casing 1, and the refrigerant circulation circuit frame 13 is taken out from this opening. -Configure so that it can be stored freely. The opening is provided with a detachable or openable / closable exterior plate.

In this heat pump type air conditioner, the air such as the outside air taken in from the air intake 7 is heat-exchanged with the refrigerant flowing through the evaporator 2, and the humidifier is operated as necessary to supply the air to the air supply port 8.
Air is supplied from the suction port 9, and at the same time, the circulating refrigerant in the condenser 3 is heat-exchanged with the air such as the outside air taken in from the suction port 9 to absorb or radiate heat and exhaust from the exhaust port 10.

At this time, the control means D increases or decreases the condenser surface wind speed in accordance with the condenser inlet air temperature detected by a detector (not shown) or the like. For example, when air is heated by the evaporator 2, the condenser surface wind velocity is increased when the condenser inlet air temperature (outside air temperature) is low, and the condenser surface wind velocity is decreased when the condenser inlet air temperature is high. On the contrary, when the air is cooled by the evaporator 2, the condenser surface wind speed is increased when the condenser inlet air temperature is increased, and the condenser surface wind velocity is decreased when the condenser inlet air temperature is decreased. As described above, by increasing the wind speed on the condenser surface, it is possible to secure the amount of heat above the performance limit of the compressor 4, and the coefficient of performance (COP) is improved. This is combined with compressor drive control. For example, one compressor operation and low condenser surface wind speed, one compressor operation and high condenser surface wind speed, two compressor operation and low condenser surface wind speed, two compressor operation And the condenser surface wind speed is high, so the capacity can be adjusted easily and finely. Even when only one compressor 4 is operated, since the condenser 3 shares the fin group 6, the heat transfer area is increased and the heat exchange capacity is increased. further,
The capacity can be controlled more finely by using the compressor 4 whose capacity can be freely controlled.

The capacity can be adjusted only by controlling the drive of the compressor, and the number of the compressors 4 and the heat transfer pipe paths 5 can be increased or decreased and the configuration of the refrigerant circulation circuit C can be freely changed.

[0012]

According to the invention of claim 1, the capacity of the air conditioner can be finely adjusted, the coefficient of performance is improved to save energy, and the compressor can be used in a wide range of regions from extremely cold regions to extremely hot regions without upsizing. . According to the second aspect of the present invention, the capacity can be more finely adjusted by adding the capacity control of the compressor. According to the third aspect of the present invention, only the refrigerant circulation circuit is taken out from the casing without removing the entire casing, whereby the refrigerant recovery work and maintenance can be performed easily, and the installation and storage are also trouble free. Also, by replacing only the refrigerant circulation circuit, it is possible to reduce the cost at the time of renewal. According to the invention of claim 4, since the pressure loss does not increase and the heat exchange capacity does not decrease even when used at a high wind speed, a small condenser can be used and the air conditioner can be made significantly compact.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a simplified explanatory diagram of a refrigerant circulation circuit.

FIG. 3 is a cross-sectional view of a heat transfer tube path.

[Explanation of symbols]

1 casing 2 evaporator 3 condenser 4 compressor 5 Heat transfer tube path 6 fins 12 Condensing blower A air supply air duct B Condensing air passage C Refrigerant circulation circuit D control means

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F25B 13/00 F28F 1/02 A F28F 1/02 F24F 1/02 401A F term (reference) 3L051 BF10 3L060 DD02 EE04 EE06 3L092 BA01

Claims (4)

[Claims] 1. An inside of a casing 1, an evaporator 2, a condenser 3 and at least two compressors 4 which constitute a refrigerant circulation circuit C, an air supply air passage A provided with the evaporator 2, and the condenser. And a condensing air passage B provided with the condenser 3,
Has at least two heat transfer tube paths 5 respectively connected to the compressor 4 in a one-to-one relationship, and a fin group 6 shared by these heat transfer tube paths 5, and in the condensing air path B, A condenser blower 12 capable of increasing and decreasing the condenser wind speed is provided, and the condenser blower 12 is provided according to the condenser inlet air temperature.
A heat pump type air conditioner comprising a control means D for performing one or both of the condenser surface wind speed control and the compressor drive control by the above. 2. The compressor 4 having a freely controllable capacity.
Heat pump air conditioner described. 3. The heat pump type air conditioner according to claim 1 or 2, wherein the refrigerant circulation circuit C is configured to be freely taken out and stored in the casing 1. 4. The heat pump type air conditioner according to claim 1, 2 or 3, wherein the heat transfer tube path 5 of the condenser 3 is formed of an elliptic tube.