JPH02279966A - Air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to detect promptly and accurately a saturation temperature required to control the degree of superheat by installing an orifice in a saturation temperature detection bypass pipe branched from a discharge gas pipeline, circulating refrigerant said saturation temperature detection bypass pipe, and minimizing the amount of refrigerant to be cooled. CONSTITUTION:When the refrigerant present in a first refrigerant pipeline 7 is liquid, closed pipe 6 is super-heated by its contact with a second refrigerant pipe 8 at high temperature in a refrigerating cycle, which vaporizes and saturates the refrigerant in a first pipeline 1, thereby detecting the saturation temperature in a saturation temperature detection pipe 22. Furthermore, a suction gas temperature detection thermistor 18 detects the temperature of suction gas and calculates the degree of superheat on a control panel 21. When he degree of super heat is small, it reduces the opening of an electronic expansion valve 13; when the degree of super heat is great, it increases the opening of the electronic expansion valve 13, thereby controlling the degree of super heat. An orifice if installed in the first pipeline 1, throttles the amount of liquefied refrigerant entering the first pipeline 1, reduces the amount of heating refrigerant, and detects the saturation temperature, thereby controlling the degree of super heat with accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure with a thermistor 'f) 4 for detecting the temperature at the mouth of a mature plant in a refrigeration cycle such as an air V@main mouth machine.

[Conventional technology]

The conventional device is "Frozen J VOL, 68. INO.

7320rl 15Hz scroll inverter air conditioner"
As described in , in order to detect the saturation temperature corresponding to the discharge pressure necessary to control the degree of superheating of the discharge refrigerant, the gaseous refrigerant that has entered the temperature detection pipe branched from the compressor discharge pipe is detected. The refrigerant in the gas state is cooled by branching off from the saturation temperature detection pipe and into a closed pipe where the surface of the pipe is in contact with the compressor suction pipe. I was using a method to detect it.

[Problem to be solved by the invention]

In the above conventional technology, in order to detect the saturation temperature corresponding to the condensation pressure V, as shown in FIG. In order to prevent overheating, the refrigerant was brought to a saturated state under pressure and the saturation temperature inside the pipe for detecting the sum temperature was detected using a thermistor, but the refrigerant temperature inside the compressor suction pipe was If the temperature rises, the cooling effect of the compressor suction piping will be poor, so when detecting the da humidity temperature equivalent to the condensing pressure, there is no consideration given to the fact that the temperature in the overheated state will be detected and the degree of superheat will be lower than the actual degree. There was a problem in that the temperature did not cool down and the degree of superheating could not be controlled correctly.

The purpose of the present invention is to detect the saturation temperature corresponding to the condensing pressure even when the refrigerant temperature in the If compressor suction distribution increases and the cooling effect of the discharge gas is poor, so as not to calculate a lower superheat degree than the actual one. The correct discharge refrigerant superheat degree is 1 lil J instantaneous in line 9.

The purpose of the θ pond of the present invention is to control the degree of superheating of the suction refrigerant by controlling the temperature equivalent to the evaporation pressure in the evaporator by discharging the refrigerant in the sludge or wet Q state at the evaporator inlet into the discharge arrangement in the high temperature state. heating by a, detecting the sum temperature and refrigeration cycle 1D
1) Even if the temperature of the discharge piping is low (9) and the heating effect is inferior (4), it is necessary to detect the temperature equivalent to the evaporation pressure and control the suction refrigerant superheat degree correctly so as not to calculate a higher degree of superheat than the actual one. It is in.

[Means to solve the problem]

In order to achieve the above objective, an orifice is installed in the saturated temperature detection pipe branched from the discharge gas distribution, and the refrigerant is circulated through the plate formation device detection pipe to reduce the amount of refrigerant cooled and to increase the cooling effect. This makes it possible to detect the saturation temperature equivalent to the condensing pressure even when the temperature is low.

An orifice was installed in the AGO temperature detection pipe that branched from the evaporator inlet pipe, and the amount of refrigerant that was detected by the temperature detection pipe was reduced to reduce the heating effect. Even if the evaporation pressure is equivalent to the υ agent temperature, it is achieved by the first town. [Function] Due to the throttling action of the orifice in the discharge gas superheat degree control, the refrigerant piping is controlled by the &! Since the amount of refrigerant filling the discharge pipe is reduced, the discharge gas can be sufficiently cooled even if the suction gas level in the suction pipe increases.
The temperature of the refrigerant in a superheated state is detected and the degree of superheat is not calculated to be too low. In addition, since the amount of refrigerant to be cooled is reduced, the discharged gas in the gas state can quickly enter the bright phase state, which speeds up the temperature detection time and improves the response of the refrigerant throttling device to control the degree of superheating of the discharged gas. Fast and correct
becomes.

In addition, when the suction gas exceeds the PA level, the amount of refrigerant circulating in the temperature detection pipe is reduced by the orifice, which reduces the amount of refrigerant circulating in the temperature detection pipe. Even when the temperature drops, it is possible to heat the refrigerant at the inlet of the evaporator in a sufficiently liquid state, and the temperature of the refrigerant in the supercooled state is detected without greatly calculating the degree of superheat. In addition, since the amount of refrigerant to be heated is reduced, the liquid refrigerant becomes less likely to deteriorate in phase rotation quickly, which speeds up the temperature detection time and allows the cooling throttle device to respond more quickly and accurately to different degrees of superheating of the suction gas. Become.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1, 2, and 8. As shown in FIGS. 2 and 8, the refrigeration cycle includes a compressor 1o, a four-way valve 11, an indoor heat exchanger 12, an electronic expansion valve 8, an outdoor heat Aj:
It is constructed by sequentially connecting the four-way valves 14 with piping, and the four-way valve 1
1 to change the refrigerant flow n to form a heat pump cycle that performs cooling operation and heating operation. Furthermore, the second
In the case of the figure, a pipe for producing a sum temperature is provided, which branches off from the discharge gas pipe and has its one end, υ closed end, in contact with the suction gas pipe in which the refrigerant is in a substitute state. In addition, in the case of Fig. 8, a temperature detection pipe is installed, which branches off from the evaporator inlet pipe and has its closed end in contact with the discharge gas pipe in which the refrigerant is at a high temperature. There is. FIG. 1 shows an analysis view of a thermistor mounting structure according to the present invention. This length-mister mounting structure has a first part g1 having an appropriate length and having both ends open, and a first part g1 having one end closed and the other end open.
A second pipe 2 having a smaller diameter than the arrangement tl is provided.

The first pipe 1 has one end connected to the first refrigerant pipe 7 (/Il-attached).

The second piping 2 is inserted into the first pipe with its closed end VC first, and the other end is expanded to close the other open end of the first pipe 1. And the length inside the second pipe is -
Mr. 5 is inserted.

If an orifice 9 is provided in the first IH, the V
A closure pipe 6 is attached to the first pipe 1, and the closed end portion of the distal end of the closure pipe 6 is brought into contact with the second refrigerant distribution u8e.

In the present invention, the closing pipe 6 is cooled or heated depending on the state of the refrigerant phase in the first refrigerant pipe 7, and the inside of the first pipe 1 is cooled or heated.
By setting the gas to a two-phase state, the J3 egg device equivalent to the condensation pressure and evaporation pressure can be detected. That is, the lth
When the refrigerant in the refrigerant pipe 7 is a liquid, the closing pipe 6 is heated by contacting with the high temperature second refrigerant pipe 8 in the refrigeration cycle system, and the refrigerant is vaporized and the refrigerant in the first pipe 1 is heated. In the saturated state, I2I of Watoni detection pipe 22! Mowing temperature Ts
Detect c. Furthermore, the suction gas temperature Ts is detected by the suction gas temperature detection thermistor 18, and the degree of superheating is determined by TS'.
The difference between Tsc and Tsc is calculated in the control panel 21, and when the degree of superheat is small, the opening of the electronic expansion valve 18 is reduced
The degree of superheating is controlled by increasing the degree of superheating, and when the degree of superheating is large, the opening of the electronic expansion valve 1B is increased to reduce the degree of superheating. At that time, the refrigerant pipe 8
If the heating effect of the refrigerant is reduced depending on the operating conditions, the mister will detect the temperature of the overheated refrigerant, so it may calculate a degree of superheat that is lower than the actual one. In the invention, by providing an orifice in the first pipe 1, the amount of liquid refrigerant entering the first pipe 1 is reduced,
By reducing the amount of refrigerant heated, the temperature in the stale state can be reduced.
I am controlling the superheat level correctly.

Further, when the refrigerant in the first refrigerant pipe 7 is a gas, by bringing it into contact with the second refrigerant pipe 8 which is in a low temperature state during the refrigeration cycle, the refrigerant in the gas state in the closure pipe υ is condensed and the refrigerant is transferred to the first pipe. The refrigerant in l is saturated and its saturation temperature is 1 Td.
Detect c. Furthermore, thermistor 1 for detecting the discharge gas temperature
7, the discharge gas temperature Td is detected and the degree of superheat is determined by I'd.
The difference between Tdc and Tdc is calculated in the control panel 21, and superheat degree control similar to that described above is performed. At that time, the refrigerant pipe 8
If the temperature of the refrigerant reaches a certain level due to the operating conditions and the cooling effect of the second refrigerant distribution 18 drops, the thermistor will detect the temperature of the refrigerant in a supercooled state, so the degree of superheating will be calculated higher than the actual one. In the present invention, by providing an orifice in the first pipe 1 as described above, the first pipe 'ff
By throttling the gaseous refrigerant circulating inside the engine and reducing the amount of refrigerant to be cooled, the saturated temperature is detected and the degree of superheating is correctly controlled.

〔Effect of the invention〕

According to the present invention, since the amount of refrigerant to be cooled and heated is reduced regardless of the operating state of the refrigeration cycle, it is difficult to detect the saturation temperature required for controlling the degree of superheating quickly and efficiently. This will be the first one.

In addition, since the refrigerant throttling device, which is controlled by calculation based on the detected relative phase temperature, can respond quickly, it is possible to quickly restore and maintain the optimum cycle.

Furthermore, by eliminating erroneous detection of the degree of superheating, it is possible to avoid a sudden increase in the temperature of the discharged gas, thereby increasing the reliability of the compressor and the unit as a whole.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the thermistor mounting structure of the present invention, FIG. 2 is a diagram of a refrigeration cycle equipped with the thermistor of FIG. 1, and FIG. 8 is a diagram of a refrigeration cycle of another embodiment. ■...First pipe 2...Second pipe 8...Seal)rH4...Thermistor signal line 5...Thermistor 6...Closing pipe 7...First refrigerant pipe 8
...Second refrigerant pipe 9...Orifice. Figure 1, Mine 2, Lid Figure 2, Figure F73

Claims (1)

[Claims] 1. A compressor, four-way valve, indoor heat exchanger, electronic expansion valve, and outdoor heat exchanger are connected in sequence to form a heat pump refrigeration cycle, branched from the refrigerant pipe where the saturation temperature of the refrigerant is to be detected, and closed at one end. At the end, a saturation temperature detection pipe is provided, the closed end of which is in contact with a high or low temperature refrigerant pipe, and the refrigerant circulating in the saturation temperature detection pipe branched from the refrigerant pipe is condensed or evaporated. An air conditioner characterized in that the refrigerant is saturated, a thermistor for detecting the saturation temperature is provided in the pipe for detecting the sum temperature, and a thermistor for detecting the saturation temperature is provided with an orifice at the inlet of the pipe for detecting the saturation temperature. Machine.