CN203163100U - Air conditioning system using DC (Direct Current) brushless motors - Google Patents

Abstract

The utility model discloses an air conditioning system using DC (Direct Current) brushless motors. An indoor machine comprises an indoor machine heat exchanger, an electric heater and a cross-flow fan; two ends of the indoor machine heat exchanger are respectively connected with a stop valve; an outdoor machine comprises an outdoor machine heat exchanger, a compressor, an axial-flow fan, a first capillary tube, a four-way valve, a gas-liquid separator and a one-way valve; the compressor is connected with a first port of the four-way valve, the four-way valve is also connected with a first stop valve, the gas-liquid separator and the outdoor machine heat exchanger, the outdoor machine heat exchanger is connected with the one-way valve through the first capillary tube, and the one-way valve is connected with a second stop valve; one side of the outdoor machine heat exchanger is provided with the axial-flow fan; and an electric motor of the cross-flow fan and an electric motor of the axial-flow fan are both the DC brushless motors. The air conditioning system using the DC brushless motors, disclosed by the utility model, has the advantages that an outdoor draught fan can be subjected to closed-loop rotating speed control, the rotating speed control of the electric motors can be stable and cannot be affected by voltage, the heating effect is better, and the like.

Description

An Air Conditioning System Using DC Brushless Motor

technical field

The utility model relates to an air conditioning system using a DC brushless motor.

Background technique

The heating capacity of fixed-speed air conditioners and the noise of AC motors have been bothering technicians in the industry, making the use of fixed-speed air conditioners unsatisfactory. In the existing fixed-speed air conditioners, most of the indoor and outdoor fan motors use AC induction motors, and most of the outdoor motors are controlled by one gear of speed. When the grid voltage is high, the noise of the outdoor motor is too large; when the grid voltage is low, the speed of the outdoor motor is too low, and the heat dissipation effect is poor; a small number of high-efficiency fixed-speed air conditioner fans Although a DC brushless motor is used, often only the outdoor fan motor adopts a DC brushless motor, and its control is extremely simple, and only a fixed driving voltage is provided for the DC motor. As a result, the heating effect of ordinary fixed-speed air conditioners and the electromagnetic sound of AC motors have been difficult to solve. Even the above-mentioned high-energy-efficiency fixed-speed air conditioners using DC brushless motors only improve the overall energy efficiency of the fixed-speed air conditioners. The heating effect, especially the heating effect at high and low temperatures, is not satisfactory. In the case of high temperature heating, due to the method of turning on the external fan to control the system load, the heating amount fluctuates greatly, and the heating effect is not ideal. Great waste. In the case of low-temperature heating, the use effect of the air conditioner is affected, especially in winter.

Utility model content

The utility model provides an air-conditioning system using a DC brushless motor to avoid the shortcomings of the above-mentioned prior art, so as to solve the problems of unstable motor speed and unsatisfactory heating effect in the existing air-conditioning system.

The utility model adopts the following technical solutions for solving technical problems.

An air-conditioning system using a DC brushless motor, its structural feature is that it includes an indoor unit and an outdoor unit, the indoor unit includes an indoor unit heat exchanger, an electric heater and a cross-flow fan; one end of the indoor unit heat exchanger A first shut-off valve is connected, and the other end of the indoor unit heat exchanger is connected to the second shut-off valve;

The outdoor unit includes an outdoor unit heat exchanger, a compressor, an axial fan, a first capillary, a four-way valve, a gas-liquid separator, and a one-way valve; the compressor is connected to the first port of the four-way valve connected, the second port of the four-way valve is connected with the first cut-off valve, the third port of the four-way valve is connected with the gas-liquid separator, and the fourth port of the four-way valve is connected with the One end of the outdoor unit heat exchanger is connected, the other end of the outdoor unit heat exchanger is connected to one end of the first capillary tube, and the other end of the first capillary tube is connected to one end of the one-way valve. The other end of the one-way valve is connected with the second cut-off valve; one side of the heat exchanger of the outdoor unit is provided with an axial flow fan; the motor of the cross-flow fan and the axial flow fan The motors are all brushless DC motors; the motor of the cross-flow fan of the indoor unit and the motor of the axial-flow fan of the outdoor unit are respectively controlled by two control boards.

The structural features of an air-conditioning system using a DC brushless motor of the present utility model also lie in:

The outdoor unit also includes a second capillary; the one-way valve is connected in parallel with the second capillary.

Compared with the prior art, the beneficial effects of the utility model are reflected in:

Since both indoor and outdoor fan motors are DC brushless motors, and a separate speed control circuit is set up, through closed-loop control, the motor speed control is stable and not affected by voltage, and the noise is small; high-temperature heating, low-temperature heating Under working conditions, the heating effect of the air conditioner is better. The control circuit board is separated into two control boards: an indoor board and an outdoor board. After the outdoor board is installed, the closed-loop speed control of the outdoor motor can be performed. The fixed speed and adjustable speed of the outdoor motor control circuit can be switched at will, and the outdoor fan can continue to work normally when the closed-loop speed control circuit is damaged. It solves the predicament that a system requirement of a common fixed-speed air conditioner corresponds to a new motor, greatly enhances the applicability and combinability of the control circuit of this invention, and greatly shortens the product development cycle.

An air-conditioning system using a DC brushless motor of the utility model has the ability to perform closed-loop speed control on the outdoor fan, making the motor speed control stable and not affected by voltage, low noise, and air conditioning under high-temperature heating and low-temperature heating conditions The heating effect of the device is better.

Description of drawings

Fig. 1 is a system schematic diagram of an air conditioning system using a DC brushless motor of the present invention.

The labels in attached drawing 1 are: 1 compressor, 2 outdoor unit heat exchanger, 3 axial flow fan, 4 indoor unit heat exchanger, 5 first capillary tube, 6 cross-flow fan, 7 four-way valve, 8 electric heater, 9 Gas-liquid separator, 10 one-way valve, 11 first stop valve, 12 second stop valve, 13 second capillary.

The utility model will be further described below through specific embodiments in conjunction with the accompanying drawings.

Detailed ways

Referring to Fig. 1, an air-conditioning system using a DC brushless motor includes an indoor unit and an outdoor unit, the indoor unit includes an indoor unit heat exchanger 4, an electric heater 8 and a cross-flow fan 6; the indoor unit heat exchanger One end of 4 is connected with a first shut-off valve 11, and the other end of the indoor unit heat exchanger 4 is connected with a second shut-off valve 12;

The outdoor unit includes an outdoor unit heat exchanger 2, a compressor 1, an axial fan 3, a first capillary tube 5, a four-way valve 7, a gas-liquid separator 9 and a one-way valve 10; the compressor 1 and the The first port of the four-way valve 7 is connected, the second port of the four-way valve 7 is connected with the first stop valve 11, and the third port of the four-way valve 7 is connected with the gas-liquid separator 9 The fourth port of the four-way valve 7 is connected to one end of the outdoor heat exchanger 2, and the other end of the outdoor heat exchanger 2 is connected to one end of the first capillary 5, The other end of the first capillary 5 is connected to one end of the one-way valve 10, and the other end of the one-way valve 10 is connected to the second shut-off valve 12; One side is provided with an axial fan 3; the motor of the cross-flow fan 6 and the motor of the axial fan 3 are brushless DC motors; the motor of the cross-flow fan 6 of the indoor unit and the motor of the outdoor unit The motors of the axial fan 3 are controlled by two control boards respectively.

The outdoor unit also includes a second capillary 13; the one-way valve 10 and the second capillary 13 are connected in parallel. As shown in Fig. 1 is a kind of air-conditioning system using DC brushless motor of the present utility model, which is composed of indoor unit, outdoor unit, refrigeration system and corresponding control circuit. During refrigeration, the low-pressure and low-temperature refrigerant vapor in the refrigeration system is sucked by the compressor 1, compressed into high-pressure and high-temperature superheated steam, and then discharged to the outdoor unit heat exchanger 2; at the same time, the outdoor air sucked by the outdoor side fan 3 flows through the outdoor The heat exchanger 2 takes away the heat released by the refrigerant to condense the high-pressure and high-temperature refrigerant vapor into a high-pressure liquid. The high-pressure liquid flows into the indoor unit heat exchanger 4 through the first capillary tube 5 to lower the pressure and temperature, and evaporates under the corresponding low pressure to absorb the surrounding heat; at the same time, the indoor side fan 6 makes the indoor air continuously enter the fins of the indoor unit heat exchanger 4 Perform heat exchange and send the cooled gas to the room after heat release. In this way, the indoor and outdoor air circulates continuously to achieve the purpose of reducing the temperature. When heating, the compression and condensation heat of the refrigeration system is used to heat the indoor air. The low-pressure and low-temperature refrigerant liquid evaporates and absorbs heat in the evaporator, while the high-temperature and high-pressure refrigerant gas releases heat and condenses in the condenser. When the heat pump is heating, the four-way valve 7 is used to change the circulation direction of the refrigerant, so that the heat exchanger of the indoor unit used as the evaporator in the cooling operation becomes a condenser in the heating operation, and the outdoor unit used as the condenser in the cooling operation The heat exchanger becomes an evaporator during heating, so that the refrigeration system absorbs heat outdoors and releases heat indoors to achieve the purpose of heating. The electric heater 8 is used as an auxiliary heating device.

Both indoor and outdoor fans use DC brushless motors, which are controlled by two control boards respectively. Through closed-loop control, the motor speed control is stable and not affected by voltage, and the noise is small; under high-temperature heating and low-temperature heating conditions, the air conditioner The heating effect is better. The outdoor motor adopts a separate control circuit, so that the fixed speed and adjustable speed of the outdoor motor can be switched at will, and the outdoor fan can continue to work normally when the closed-loop speed control circuit is damaged.

Claims (2)

1. An air conditioning system using a DC brushless motor, characterized in that it includes an indoor unit and an outdoor unit, and the indoor unit includes an indoor unit heat exchanger (4), an electric heater (8) and a cross-flow fan (6) ; One end of the indoor unit heat exchanger (4) is connected to a first shut-off valve (11), and the other end of the indoor unit heat exchanger (4) is connected to a second shut-off valve (12); The outdoor unit includes an outdoor unit heat exchanger (2), a compressor (1), an axial fan (3), a first capillary tube (5), a four-way valve (7), a gas-liquid separator (9) and a single to the valve (10); the compressor (1) is connected to the first port of the four-way valve (7), and the second port of the four-way valve (7) is connected to the first cut-off valve (11 ), the third port of the four-way valve (7) is connected with the gas-liquid separator (9), the fourth port of the four-way valve (7) is connected with the outdoor unit heat exchanger ( 2), the other end of the outdoor unit heat exchanger (2) is connected to one end of the first capillary (5), and the other end of the first capillary (5) is connected to the one-way One end of the valve (10) is connected, and the other end of the one-way valve (10) is connected with the second shut-off valve (12); one side of the outdoor unit heat exchanger (2) is provided with an axial flow fan (3); the motor of the cross-flow fan (6) and the motor of the axial-flow fan (3) are both brushless DC motors; the motor of the cross-flow fan (6) of the indoor unit and the motor of the outdoor The motor of the axial flow fan (3) of the machine is controlled by two control boards respectively. 2. An air-conditioning system using a DC brushless motor according to claim 1, wherein the outdoor unit further includes a second capillary (13); the one-way valve (10) is connected to the second capillary ( 13) Phase parallel connection.

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