JPH04203757A - Air-conditioner - Google Patents

Abstract

PURPOSE:To perform smooth transfer to steady operation in a short time by a method wherein the capillary tube of an indoor unit comprises a plurality of cycle routes, and during the starting of a cooling cycle, a solenoid valve opened for a specified time is installed in a capillary tube route for a refrigerant flow rise. CONSTITUTION:The refrigerant flow of a cooling cycle flows from a compressor 1 to a condenser 2 and returns through an accumulator 5 to the compressor 1 after the flow of it through a capillary tube 3 for steady operation to a vaporizer 4. A capillary tube 6 for a starting is connected through a solenoid valve 7 in parallel to the capillary tube 3. Only fan is run according to a fan operation command, cooling cycle operation is effected according to a cooling operation command, and a solenoid valve 7, simultaneously, is opened. After the solenoid valve 7 holds an opening state for a specified time, the valve is closed and brought into a cooling operation steady state. Since during the starting of a cooling cycle, a refrigerant flows in the capillary tubes 6 of a plurality of routes for a specified time, rise resistance is reduced and smooth transfer to a steady cycle is effected in a short time. After transfer to steady operation, a cycle is controlled by means of the capillary tube 3 for steady operation.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a refrigeration cycle machine for an air conditioner.

[Conventional technology]

In the conventional device, the capillary tube of the indoor unit is
Since it consists of one cycle path, it takes about 10 minutes from the start of the refrigerant flow at the start of the refrigeration cycle to steady operation. In other words, capillary tube selection.

This was designed with the assumption that it would be in a steady state operating state, and the pressure resistance was too large during start-up, which prevented a smooth transition to a steady state.

In addition, as described in Japanese Utility Model Application Publication No. 130864/1986, there is a system in which a bypass flow path with a pressure on/off valve is provided in parallel with the electric signal controlled expansion valve system path, but this is not suitable for controlling the refrigerant during startup. There was the same problem as above.

[Problem to be solved by the invention]

The above conventional technology does not take into consideration the smooth short-term transition from the start-up of the refrigerant flow to steady operation at the time of starting the refrigeration cycle, and does not consider the short-term smooth transition from the start-up of the refrigerant flow to steady operation at the time of starting the refrigeration cycle. When the system repeatedly starts and stops, there is a problem in that the cooling power output is small compared to the amount of power consumed, resulting in inefficient cooling operation.

An object of the present invention is to provide a refrigeration cycle configuration and its control to smoothly transition from the start-up of refrigerant flow at cycle startup to steady operation in a short time. The purpose is to improve operational efficiency during repeated starts and stops.

[Means to solve the problem]

In order to achieve the above objective, the capillary tube of the indoor unit is configured with multiple cycle paths, and when the cooling cycle is started, a solenoid valve that is controlled to open for a certain period of time is connected to the capillary tube path for starting the refrigerant flow. It was installed in

[Effect]

When the cooling cycle is started, the refrigerant flows through the capillary tube for starting the refrigerant flow for a certain period of time through the solenoid valve. As a result, when the cooling cycle is started, the refrigerant flows through multiple systems in parallel with the capillary tube system for the steady-state cooling cycle, making it possible to smoothly transition to steady-state operation in a short time, reducing the cooling load. It is possible to improve the operating efficiency when the cooling cycle operation is repeatedly started and stopped for a short period of time, such as in small situations.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

The refrigerant flow in the cooling cycle enters the condenser 2 from the compressor 1, passes through the capillary tube 3 for steady operation, and then flows into the evaporator 4.
The cycle is such that the air enters the air, passes through the accumulator 5, and returns to the compressor 1. A starting capillary tube 6 is connected in parallel to the capillary tube 3 via a solenoid valve 7. Structurally, a branch pipe 10 is attached to the liquid pipe 11,
A distributor 9 is attached to one side of the branch pipe 10, and a distributor 8 is attached to the other side via a solenoid valve 7. Both capillary tubes 3, 6 are connected to the pipe 12 of the evaporator 4. Gas pipe 15 is Helada 14
It is connected to the.

The control wiring 16 of the solenoid valve 7 is connected to a control board in an electrical component box 17, and is electrically controlled to open and close. Fifth
As shown in the figure, the fan motor 18 and the solenoid valve 7 are energized and controlled by the control board.

Here, the circuit diagram and explanation of the control board will be omitted.

Only the operation will be explained with reference to FIG.

From the stopped state, only the fan will operate with a fan operation command. A cooling cycle operation is initiated by the cooling operation command, and at the same time, the solenoid valve opens, and after the solenoid valve remains open for a certain period of time, it closes and enters the steady state of cooling operation. When the cooling operation is stopped, only the fan operates.

The fan will also stop when the full stop command is issued.

Due to the above operation, when the cooling cycle starts, the refrigerant flows through the capillary tubes of multiple channels for a certain period of time, so
The start-up resistance is low, and the transition to a steady cycle is smooth and quick.

After moving to steady operation, cycle control is performed using the same capillary tube for steady operation as in regular products.

According to this embodiment, as shown in FIG. 6, the start-up of the cooling power is smoother and shorter than the start-up of the cooling power at the start of the conventional cooling cycle, and the start-up of the cooling power is smoother and takes a shorter time, especially when the cooling load is small. It is possible to improve operational efficiency during repeated start and stop of cycle operation.

〔Effect of the invention〕

According to the present invention, the cooling power can be ramped up smoothly and in a short time when the cooling cycle is started, thereby improving operating efficiency when repeatedly starting and stopping the cooling cycle operation for a short period of time, such as in situations where the cooling load is small. can be increased.

Furthermore, it is possible to improve the 5EER value calculated from the integrated input and integrated cooling power when the cooling cycle operation is repeatedly started and stopped.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a refrigeration cycle according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the capillary tube portion of FIG. 1, and FIG. 3 is a plan view showing the structure of the indoor unit of the present invention. 4
The drawings are a side view of FIG. 3, FIG. 5 is a control block diagram of the present invention, FIG. 6 is an operational cooling power state diagram at startup, and FIG. 7 is a control explanatory diagram of the present invention. 1... Compressor, 2... Condenser, 3... Capillary tube, 4... Evaporator, 5... Accumulator, 6
... Refrigerant m fL I Lf J'tl ”r ”r
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. Agent Patent Attorney Katsuma Ogawa 1... Karikatsu 1 [! 1

Claims (1)

[Claims] 1. In an air conditioner equipped with a refrigeration cycle consisting of a compressor, a heat exchanger, and a cycle control device, a capillary tube arranged as a refrigerant expansion device of the heat exchanger serving as an evaporator is provided. In addition, a system for steady cycle operation and a system for cycle startup are provided, and a solenoid valve is provided in the capillary tube system for startup, so that the solenoid valve is closed for a certain period of time during startup. An air conditioner characterized in that a refrigerant is made to flow through the capillary tubes of both systems at startup by opening a valve.