JPS5842843Y2 - air conditioner - Google Patents

Description

[Detailed description of the invention] This invention is an air conditioner that has a refrigeration cycle composed of a compressor, a condenser, a capillary tube, an indoor evaporator, etc.
More specifically, it relates to the piping structure of the indoor evaporator.

First, the refrigeration cycle of the air conditioner shown in FIG. 1 will be described.

1 is a compressor, 2 is a condenser, 3 is a capillary tube, 4
is an evaporator, and these devices are sequentially connected by piping.

The high-temperature, high-pressure refrigerant gas discharged from the compressor 1 flows into the condenser 2, where it radiates heat and condenses to a saturated state, or is further cooled to a supercooled state and is sent out.

The liquid refrigerant is depressurized by the capillary tube 3,
It enters the evaporator 4 in a state where it is easily evaporated.

When the refrigerant evaporates here, the heat of evaporation is absorbed from the surroundings and sucked into the compressor 1 again.

This series of cycles absorbs heat from the indoor side and radiates it to the outdoor side.

Further, this cycle will be explained using Mollier lines in FIG.

In the figure, the horizontal axis represents enthalbin, and the vertical axis represents pressure.

The refrigerant in state a is adiabatically compressed in compressor 1 to state b at temperature t1 and pressure P, and in condenser 2 it is compressed to state b at temperature t2 and pressure P.
The heat is radiated to a saturated liquid state of 1C.

Furthermore, the capillary tube 3 further increases the pressure P2 and the temperature t.
The pressure is reduced to state d in step 3 and sent to the evaporator 4.

The refrigerant sent to the evaporator 4 absorbs heat and reaches a temperature t4.
, it returns to the superheated vapor state a at pressure P2 and is sucked into the compressor 1.

On this Mollier line, when the refrigerant in state d changes to state a by the evaporator 4, e crosses the saturated vapor line.
In this state, the amount of heat of evaporation absorbed by evaporation of the liquid refrigerant reaches a maximum, and thereafter the refrigerant becomes a superheated gas state a while absorbing heat in the gas state.

FIG. 3 shows a conventional evaporator 4 for evaporating a refrigerant having the above-mentioned properties.

In the figure, 5 is an intermediate pipe, 6 is an outlet pipe, and 11 is an artificial pipe, and the artificial pipe 11 is adjacent to the outlet pipe 6.

When the refrigerant is evaporated by the evaporator 4, the pipe 5 becomes in a state as shown in e in FIG. 2, and the temperature becomes the lowest.

In addition, the outlet piping 6 will be in a state like a in Figure 2,
The temperature increases.

Therefore, a temperature difference occurs between the upper part of the evaporator and the lower part, which is the middle part where the refrigerant evaporates.

FIG. 4 shows an indoor unit 7 incorporating the above-mentioned evaporator 4.
shows.

8 is an inner surface of the unit, 9 is a fan, and the evaporator 4 is attached to the suction side of the fan 9.

In this indoor unit 7, since there is a temperature difference between the upper and lower parts of the evaporator 4, a temperature difference also occurs in the air passing through the upper and lower parts of the evaporator 4.

Furthermore, the humidity of the air that has passed through the evaporator and been cooled to reach the dew point temperature is nearly 100%.

Therefore, when the air that has passed through the upper part of the evaporator is cooled by contact with the air that has passed through the lower part of the evaporator, the temperature reaches the dew point or higher, resulting in frost formation on the inner surface 8, fan 9, etc. of the unit.

The purpose of the present invention is to make the temperature distribution uniform throughout the evaporator in order to eliminate temperature differences in the air passing through it.

Hereinafter, one embodiment of the present invention will be explained with reference to FIG.

10 indicates the entire evaporator.

11 is an inlet pipe provided at the top of the evaporator, 5 and 14 are intermediate pipes, 13 is a pipe at the top of the evaporator, and 12 is a pipe 13
A U-shaped pipe 6 connecting the pipe 14 and the pipe 14 is an outlet pipe, which is provided adjacent to the pipe 14 in the middle.

The refrigerant flowing in from the inlet pipe 11 passes through the intermediate pipes 5 and 14 where the temperature is lowest, and then is led to the pipe 13 at the upper part of the evaporator via the U-shaped pipe 12.

The refrigerant is then supplied to the outlet pipe 6 adjacent to the intermediate pipe 14.
flows out from

Therefore, when this evaporator 10 is assembled into an indoor unit as shown in FIG. 4, the temperature between the upper and lower parts of the evaporator 10 is increased by placing the piping part where the temperature becomes high and the piping part where the temperature becomes low close together. The difference is almost eliminated, and the temperature distribution of the air after passing through the evaporator can be made uniform.

Therefore, frost formation inside the indoor unit can be prevented.

[Brief explanation of drawings]

Figure 1 is a system diagram showing the refrigeration cycle of an air conditioner;
The figure is a cycle diagram shown on the Mollier line, Figure 3 is a perspective view showing a conventional evaporator for an air conditioner, Figure 4 is a cross-sectional side view showing an indoor unit, and Figure 5 is an evaporator according to the present invention. FIG. 1 is a perspective view showing one embodiment. 5...Middle piping, 6...Outlet piping,
10... Evaporator, 11... Inlet piping,
12... U-shaped pipe, 13... Upper piping, 14... Middle piping.

Claims (1)

[Scope of utility model registration request] In an air conditioner in which a refrigeration cycle is configured by a compressor, a condenser, a capillary tube, an indoor evaporator, etc., a refrigerant pipe is installed in the middle of the entire length of the indoor evaporator 10, which is installed approximately at right angles to the air flow. The arranged pipe 14 and the pipe 13 arranged at the end are connected to each other by a U-shaped pipe 12,
An air conditioner characterized by a structure in which an outlet pipe 6 is arranged adjacent to the pipe 14.