JPS59147967A - Air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner having cooling and dehumidifying functions.

Figure 1 shows an overview of a conventionally used air conditioner for both cooling and dehumidification. Cooling cycle/I/hour, compressor (1)
The refrigerant discharged through the four-way switching valve (
(hereinafter referred to as a four-way valve) (2) k 1ffl enters the 1 vertical condenser (8), exchanges heat with outdoor air, and condenses and liquefies. This liquid refrigerant passes through the second check valve (7) and is throttled @(
It is depressurized at step 6) and enters the cooling coil/L/ (4). The low-pressure liquefied refrigerant exchanges heat with indoor air A, evaporates, and becomes compressed (1
). Then, the indoor air A is cooled, dehumidified, and blown into the room. At that time, the blown air passes through the reheating coil (3), but no heat is received (ζ).
This is because the first check valve (5) is provided at one end of ) to prevent the refrigerant from flowing in, so that it does not function as a heat exchanger. At this time, the other end of the reheating coil (3) is connected to the four-way valve (2).
) is in communication with the suction port of the compressor (1).

On the other hand, during the dehumidification cycle, the four-way valve (2) is switched to 1.
The circuit indicated by the broken line in the figure is formed. Therefore, the refrigerant discharged from the compressor (1) passes through the four-way valve (2) and reheats the coil tV (
flows into a). Here, -S is exchanged with the indoor air B which has been cooled and dehumidified by the cooling carp/L/(4), and the air is condensed and liquefied.

Then, the air B inside the room is heated, its relative humidity decreases, and it is blown out into the room as indoor air C. The liquid refrigerant flows through the first check valve (5
) The pressure is reduced by the expansion device (6) and the cooling coil /L/
(4) exchanges heat with indoor air/Air A, evaporates, and compresses (1)
). At this time, the condenser (8) is in communication with the suction port of the compressor (1) via the four-way valve (2).

In the above circuit, during the cooling cycle, the reheat coil (3), which is an indoor heat exchanger, is not utilized in the refrigeration cycle. In addition, when switching from the cooling cycle to the dehumidifying Psyche-P, the condenser (8)
and the suction port of the pressure wJ machine (1) are communicated.

When switching from the dehumidification cycle to the cooling cycle, the reheating coil /l/ (3), which had been condensing and liquefying, and the suction port of the compressor (1) are communicated, so the condenser (8)
Alternatively, the high pressure liquid refrigerant in the reheat coil/l/ (3) is rapidly moved due to the pressure difference and flows into the compressor (1).

That is, in either case, when the operating cycle lV'jr is changed, a sudden liquid back up may occur and the compressor (1) may be damaged. Furthermore, during dehumidification operation in winter, if the temperature of the outdoor air is lower than the indoor air A, the temperature of the outdoor air may become lower than the suction pressure saturation temperature of the compressor (1). In this case, there is also the disadvantage that refrigerant accumulates in the condenser (8), resulting in a shortage of operating refrigerant and a decrease in performance.

This invention was proposed to improve the above drawbacks.
By using the reheating coil as a cooler during the cooling cycle, performance is improved and the cycle/I/'i
! When switched to il-, high-pressure liquid refrigerant is guided to the cooling coil, where it is evaporated and then sucked into the compressor, which prevents liquid back up and maintains performance even when the outdoor air temperature drops during winter dehumidification operation. This provides air conditioning that does not deteriorate.

Below, an example of this invention is shown in Fig. 21 (during cooling operation).
This will be explained with reference to FIG. 3 (during dehumidification operation).

In the figure, the same symbols as in Figure 1 indicate the same or equivalent parts,
(Ill is the first pipe line that communicates the inlet of the condenser (8) and the reheating coil/l/ (3), and there is a first throttle device (towards) on the way.
and check valve closed). Q21 is the condenser (8
) and the first pipe line (11), and is a second pipe line that connects the four-way valve (2) and the reheating carp /I/ (3). θ3
1 is the third conduit that bypasses the second throttling device z installed at 111 of the reheating carp/l/ (3) and cold-boosting carp A/ (4), and there is a solenoid valve in the middle! 23) is provided. This solenoid valve □□□ opens during the cooling cycle and closes during the dehumidification cycle. (14) is the four-way valve (2) and the cooling coil IV
(4) A fourth pipe communicating with the inlet of the four-way valve (2).
When the cooling system is fully formed, it communicates with the second pipe θ2 through the four-way valve (2), and when the dehumidifying system μ is formed, it communicates with the condenser through the four-way valve (2). It communicates with (8). On the 4th W path (141, there is a third throttle device (
A check valve (20) is provided.

The check valve [il] prevents the flow from the inlet of the cooling coil/l/ (4) toward the four-way valve (2). That is,
Full flow is allowed only from the four-way valve (2) to the inlet direction of the cooling coil (4).

Next, the action will be explained.

During cooling operation (Fig. 2), the four-way valve (2) is switched,
As shown in the figure, a cooling psyche) v is formed.

Therefore, the refrigerant discharged from the compressor (1) is
) through! It enters the condenser (8), exchanges heat with the outdoor air, and E to condense and liquefy. The liquefied refrigerant is passed through the first pipe (Ill
'e communication), the pressure is reduced by the first expansion device (Hiroshi). This low-pressure liquefied refrigerant flows into the reheating coil/I/(3), and the cooling coil/L
/ Heat exchange with the indoor air B that has been cooled and dehumidified in (4), and a portion of it evaporates. The indoor air B is further cooled and dehumidified, and is blown into the room as indoor air C. The refrigerant, a part of which has evaporated in the reheating coil/l/ (3), is removed from the solenoid valve (2).
31 and enters the cooling coil (4), where it exchanges heat with room air A, evaporates, and returns to the pressure krU machine (1). Then, the indoor air A is cooled and dehumidified to become the above-mentioned indoor air B.

In this cooling cycle, the second
The pipe line 021 and the fourth pipe line (14) are connected, but since the fourth pipe line (14) is equipped with a third restrictor V device, the eleventh Most of the refrigerant whose pressure is reduced at the head of the pupil flows into the reheat coil tL/(3) as described above. A small portion of the refrigerant flows into the second pipe θ2, the four-way valve (2) Although it flows into the cooling coil A/(4) through the 'i-route o41', it contributes to heat exchange with the indoor air A at the cooling coil/l/(4), so there is no loss.

On the other hand, during dehumidification operation (FIG. 3), the four-way valve (2) is switched to form a dehumidification psyche A/ as shown.

Therefore, the refrigerant discharged from the compressor (1) is
) through! ll condenser (8) and $1 pipe M
flow into. Here, the refrigerant exchanges heat with the cooled and dehumidified indoor air B in the cooling coil 4) and is condensed and liquefied. Indoor air B is heated, its relative humidity is reduced, and it is blown into the room as indoor air C. Since the solenoid valve (231 is closed, the interpressure liquefied refrigerant passes through the second pivot device), and even though the pressure is reduced here, this low-pressure liquefied refrigerant enters the cooling coil A/ (4), where it exchanges heat with indoor air A. The indoor air A is exchanged, evaporated, and returned to the compressor (1), and indoor air A is cooled and dehumidified to become indoor air B. In this dehumidification cycle, the first pipe line (11), the condenser (8), and the The fourth pipe (14) is communicated with the four-way valve (2), but the check valve @I provided in the first pipe (11) prevents the high-pressure refrigerant from flowing to the condenser (8). However, immediately after switching from cooling psych μ to dehumidifying psych μ, high pressure liquid refrigerant exists in the condenser (8), and this flows from the four-way valve (2) to the fourth pipe α4). However, this high pressure liquid refrigerant is depressurized by the third restrictor 9 device circle, and the pressure is reduced to low pressure.
The low-pressure liquid refrigerant enters the cooling coil (4) and evaporates.

Therefore, the liquid 94 does not suddenly accumulate immediately after switching. Further, the high-pressure liquid refrigerant in the condenser (8) can be used to cool the indoor air A. Furthermore, during the dehumidification cycle, even if the temperature of the outdoor air falls below the saturation temperature of the inlet pressure (i.e. evaporation pressure) of the cooling coil (4), the refrigerant is prevented from moving towards the condenser (8).

Therefore, even if the outdoor temperature drops during winter, the performance of the dehumidifying operation is not affected.

As described above, according to the present invention, during the cooling cycle, in addition to the cooling coil v (4), the re-coil /l/ (3)
acts as a cooler, improving performance.

In addition, when the cooling and dehumidifying cycles are switched, the liquid refrigerant in the non-operating pipes is evaporated by the cooling coil μ, so there is no sudden liquid buildup in the compressor immediately after the cycle is switched, which could damage the compressor. At the same time, high-pressure liquid refrigerant can be effectively used to cool indoor air.

Furthermore, in conventional air conditioners that combine cooling and dehumidification, there is a risk that refrigerant may leak from one of the check valves in either pump, and the leaked refrigerant is directly transferred to the compressor (
1), so the performance will decrease by that amount,
In this invention, performance deterioration due to refrigerant leakage as described in E does not occur during the cooling cycle.

Furthermore, even if the temperature of the outdoor air chamber drops during the dehumidification cycle, the refrigerant moves to the condenser and does not accumulate, so performance does not deteriorate.

[Brief explanation of drawings]

FIG. 11 is a cycle explanatory diagram of a conventional cooling/dehumidifying air conditioner, and FIGS. 2 and 3 are cycle diagrams of a cooling operation and a dehumidifying operation, respectively, showing an embodiment of the present invention. In the figure, (1) is the compressor, (2) is the four-way switching valve, (3) is the reheat coil/l'%, (4) is the cooling coil, (8) is the condenser, and (11) is the first pipe line, (121 is the second pipe line, (1
31 is the third conduit, Q4] is the fourth conduit, (201 is the first throttle device, and I1 is the check valve, □□□ is the second throttle device, (transfer) is the solenoid valve It is. Note that the same reference numerals indicate the same or equivalent parts. Agent Makoto Kuzuno

Claims (1)

[Claims] The refrigerant discharged from the compressor is transferred to a first conduit in which a four-way switching valve, a condenser, a first throttling device and a first check valve are installed in series, and a third conduit in which a solenoid valve is installed in the middle of the reheating coil. The cooling psychrometer μ is sucked into the compressor through the pipe line and the cooling coil /1/
and a second pipe line which bypasses the refrigerant discharged from the compressor, the four-way switching valve, the condenser and the first pipe line, the reheating kiln, and a second pipe line which bypasses the third pipe line. A dehumidifying cycle in which the air is sucked into the compressor through the grading device and the cooling coil /l/, and during the cooling cycle, the second pipe line and the cooling coil inlet are communicated through the four-way switching valve. During the dehumidification cycle, there is a fourth pipe line that communicates the condenser with the inlet of the cooling coil I through the four-way switching valve, and a fourth pipe line that is provided in the middle of the fourth pipe line, An air conditioner characterized by comprising a second check valve that allows flow only in the direction of entry.