JPS59219672A - 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] [ff, Ming's technique 4js field] The present invention provides a method for circulating the refrigeration cycle during heating operation.
The IC heat pump type air conditioner heats the refrigerant in its evaporation culm, and in particular, the refrigerant released from the discharge side of the compressor to the bypass valve is directly pumped into the refrigerant heating heat exchanger. This invention relates to an air conditioner that increases the amount of refrigerant circulating through a refrigerant heating heat exchanger at the start of heating operation, thereby improving the start-up performance of heating operation.

Technical background of the invention and its problems] A conventional refrigeration cycle of an air conditioner according to the invention was constructed as shown in FIG.

The refrigerant in the refrigeration cycle undergoes a phase change due to the exchange of heat, but is circulated within the circuit 4 due to the pressure difference between the discharge side 2 and the suction side 3 of the compression II 1.

During heating operation, the refrigerant scum compressed by compressor 1 is l! ! I 15 'j-i 5 (forming the flow path shown by the solid line in the figure) and installed inside the air-conditioned room (not shown) (J to indoor heat exchanger 6 to 9 The air condenses and releases latent heat, heating the air-conditioned room.

The refrigerant condensed in the indoor heat exchanger 6 further flows through the circuit 4 to the suction side 3 and reaches the first branch point 7. Since it is provided for,
cannot flow forward and therefore flows to the other channel -C
The refrigerant is guided to a heat exchanger 9 for heating the refrigerant. Here, the refrigerant is heated by the combustor 1o, evaporates, and changes its phase into a gaseous state, thereby storing its heat as latent heat.

The scum-like refrigerant further flows through the circuit 4 to the suction side 3, and reaches the second branch point 12 via the two-way valve 11 which is opened midway, but from this point there is no flow path in the direction of the four-way valve 5. Since the second check valve 13 is provided, the flow cannot flow any further, and it flows further to the suction side 31\ and returns to the compressor 1. 14 (in the figure, human body) (reception) is formed.

Also, in this air conditioner, a part of the refrigerant circulates through the heating circuit 14 of the refrigerating recycle during the compression process, is released from the discharge side 2 of the compressor 1, and is bypassed to the suction side 3 through the release circuit. 15 is formed. A release valve 16 (for example, a solenoid valve, etc.) is interposed in the release circuit 15.
The release circuit 15 is opened and closed by opening and closing the circuit 155, but the circuit 155 is opened during heating operation and closed during cooling operation.
In other words, the refrigerant release interval is set to match the rated heating capacity/power or the rated combustion amount, and the interval cannot be changed.3, J3.1
7 is opened in the release circuit 15.
- It's true.

By the way, at the start of heating operation, that is, during the transition from the start of heating operation to stable operation, the refrigerant charge 1u (
(or pressure) is low and some of the refrigerant is in the release circuit (15).
Because the refrigerant is released through the heating circuit 14, the amount of refrigerant circulated through the heating circuit 14 is extremely small. As a result, the refrigerant in the refrigerant heating heat exchanger 9 is heated excessively. In particular, when the outside temperature is (L), a large amount of refrigerant dissolves into the refrigerating machine oil in the compressor 1, causing a slow rise in the amount of refrigerant circulation and the above-mentioned refrigerant heating. Since this becomes noticeable, it becomes necessary to suppress the heating of the combustor 10 when heating starts.

Therefore, conventionally, as shown in FIG. 1, a fuel 1 supply control means 19 for controlling the amount of fuel supplied is interposed in the middle of the fuel supply system 18 of the combustor 10, and this fuel supply control means 19 is fLi of the refrigerant heating heat exchanger 9. The temperature of the refrigerant detected by the temperature detector 20 installed in -J was controlled by the control device 21, thereby preventing the refrigerant from overheating.

On the contrary, combustion amount control based on refrigerant temperature (e.g.
The heating start-up 1 (1) obtained by such a combustion small advantage 11 is necessarily good, but the normal hot air heating 17j machine J ,
There were also problems with ease of use.

Separately, if the amount of refrigerant circulating in the heating circuit 14 is increased when one flash rises to 1 yuan, the above heating can be eliminated.
There is also an idea to open the release valve 1G interposed in the release circuit 15 in the rib and use it as a refrigerant release hanger 1]. However, in this case, all the refrigerant passes through the guided heat exchanger 6,
Since liquid exceeding the heating capacity flows into the heat exchanger 9 for heating the refrigerant, compression 1 and 1 tend to back up.

Therefore, in order to eliminate this dk back, 0N10F+- control of the C release valve 1G is required in place of the above-mentioned combustion control, and there is no change in visual clutter. Moreover, according to the experiments of the wood inventor Satoshi, the ON/Ol-
The number of '-F's was high and only 4 pins were required, and the heating start-up performance was not much different from that of conventional models.

Conventional systems require complicated control 311, and the startup performance of heating is very poor.
(There was a problem with it being bad.

For cooling operation, if the four-way valve 5 is switched and a flow path is formed as shown by the broken line 4J in the figure, normal cooling operation using the refrigeration cycle can be performed. Further, in the figure, 22 is an outdoor heat exchanger forming a condenser of the cooling circuit, and 23 is a throttling device using an L chitopillary tube or an expansion 111M valve.

(General Purpose) The present invention has been made in view of the above circumstances, and its purpose is to increase the refrigerant circulation amount at the start-up of heating operation without avoiding liquid backlash, thereby improving the start-up performance of heating. It provides air conditioning that has been significantly improved.

[Common (1■1ri1) According to the present invention, the above [] objective is achieved in the following manner.Immediately, during heating operation, the circulating refrigerant of the refrigeration cycle is used for heat exchange for refrigerant heating. In the air conditioner, a release circuit is provided that bypasses and releases the refrigerant from the discharge side of the compressor forming the refrigeration cycle to the input side of the refrigerant heating heat exchanger. At the same time, a control valve that is opened at the start of heating operation is installed in this release circuit.
'/10 (1, 1 bypasses the CO refrigerant to the suction side of the LF compressor and flows into the refrigerant heating heat exchanger for heat exchange for refrigerant heating) and passes through 1? It is designed to increase the T medium's swelling.

Embodiment 1 of Komyo A preferred embodiment of the air conditioner I according to the present invention will be described below with reference to the attached drawings.

The configuration of the air-conditioning circuit itself that forms the refrigeration cycle in air conditioners related to wood additives is the same as that of the conventional example, but here, the existing release circuit' (release valve 16 in the They are referred to as a first release valve and a first release valve.

As shown in FIG.
To 1 b Bypass the refrigerant from the 111 outlet side of J1 shrinkage 1! (Release/second release time r/I 255
is connected to the heating circuit '14, and its connection position is the heat exchanger I9 for heating the refrigerant! (i/ +
I'm here in Gakushu.

In the middle of this second release circuit 25, like the first release circuit 15, a second release circuit R26 (for example, (J
A solenoid valve '8) is interposed, and the first and second release valves 1
0.26 is the above first and second release circuit 15.25
A control block f@ is configured to control the flow path of ff Changing the ratio of the refrigerant release claws means not only when the control valve controls the refrigerant release in stages or continuously, but also when the -15 release circuit is cut off and only the other release circuit is opened or closed. It also includes changes that occur in

Therefore C12 release circuit I J l 1 of 25
7) When the release refrigerant is selectively flowed into one of the circuits, the branch point of the first and second release circuits 15 and 25 (a three-way valve provided in this way) is used.

Further, the indoor heat exchanger 6 that forms and covers the refrigeration cycle is equipped with a temperature sensor 27 for detecting its condition. Article 1'1 (Knowing the 5'l-up time of this nM operation, μ, on the other hand, knowing that it can exceed a certain value ('d)
It has become so. A detection means for detecting a change in the cold tofu state is constituted, and an output signal from this detection means controls the above-mentioned control block a11. (a) The operation is restricted. Note that this detection means [siri t,
Lun Island) Limited to Banquet 7 Renri 27-C is not,
↑ Detect the pressure of the circulating refrigerant in the freezing cycle.

Next, I will explain the effect of wood addition.

1. At the start of operation, the amount of refrigerant that flows into the heating circuit 14 via the indoor heat exchanger 6 is small due to the low temperature. At this time, the temperature sensor 2
It is determined from the 411 bow of 7 that the cycle is at the start of heating, and an operation command based on the start of heating is output to the control unit R. This operation command is transmitted to the second release circuit 2 in the direction in which the control valve 11ζ, that is, the first and second release valves 16. is operated in the opening direction to cause most of the amount of refrigerant released from each boat 1 to flow to the heat exchanger 9 for heating the refrigerant. In this case, if the heating operation is
First release circuit 15) according to the transition of Ni 11 and Te
Even if the refrigerant flow to the second release circuit 25 and the second release circuit 25 are gradually reversed, or the first release valve 16 is shut off and the second release valve 2G is turned off. Heat exchanger 9 for heating all released refrigerants
It is also possible to maintain this state until the heating operation No. 3 disappears. Therefore, in any case, when the first heating is completed, the refrigerant gas that was conventionally compressed (bypassed to the suction side) flows into the refrigerant heating heat exchanger 9, so that the refrigerant heating heat is transferred to the refrigerant heating heat exchanger 9. The refrigerant circulation 7g through the exchanger 9 is significantly increased.As a result, the sudden rise in the refrigerant temperature in the heat exchanger 9 for heating the refrigerant can be effectively prevented from rain-proofing C-
J: The start-up performance of heating is greatly improved.

Further, the released refrigerant bypassed by the second release circuit 25 is released into the circuit between the refrigerant heating heat exchanger 9 and the indoor heat exchanger 6, and is condensed and flows from the indoor heat exchanger 'a6. It joins with the refrigerant liquid and enters the refrigerant heating heat exchanger 9. Therefore, liquid backflow to the pressure 11h1 due to low refrigerant temperature can be effectively prevented.

At the normal start and end of the warm-up operation, the control device 21 determines from the signal from the control valve 27 that the transient period of the cycle has ended and entered the stable period, and the control valve switches to the first When the release circuit 155 is completely closed, the second release circuit 25 is immediately shut off, and the compressor 1 switches to the original heating operation state in which only the suction side c3 '\ of the compressor 1 is released to the cold 1 and '<.

In this way, by detecting changes in the refrigerant state due to heating operation, the amount of refrigerant circulation during transient times is increased without avoiding liquid back-up, and the normal refrigerant circulation is ensured for stability 114. This makes it possible to significantly reduce the heating of Tachiko Ritake's 111 house and maintain the refrigerated Nicle in a stable operating state at all times. In addition, the refrigerant release, λm, flowing into the refrigerant heating heat exchanger 9 is controlled at the start of heating II, 1, and this control primarily increases the amount of refrigerant circulation, so it is not possible to Requires complex combustion amount control! ! l', relatively easy. In particular, turn the control valve to 0N.
If 10FF control is used, the controllability (.L) will be extremely easy.

[Effect of the Invention 1 In short, according to the present invention, the following excellent effects can be achieved.

■During heating operation, the refrigerant released by the compressor is passed through the refrigerant heating heat exchanger based on changes in the refrigerant state, so the amount of refrigerant circulating through the refrigerant heating heat exchanger is reduced at the start of heating when the amount of refrigerant circulation is small. It is possible to effectively prevent refrigerant heating in the refrigerant heating heat exchanger, and to significantly improve the start-up performance of heating.

■By passing the compressed 1/2 release refrigerant directly to the refrigerant heating heat exchanger without passing through the indoor heat exchanger, it is possible to increase the amount of refrigerant circulation during transient periods without causing liquid back-up. can.

[Brief explanation of the drawing]

Fig. 1 is a Mrlt diagram showing the configuration of the cooling and freezing system of an air conditioner according to the conventional example of the present invention. There is a J circuit diagram showing the 414 configuration of the refrigeration recycle for an air conditioner.
3 [Yo compression (Number suction side, 6 (Yo indoor heat exchanger, 9 is heat exchanger for refrigerant heating, 14 is 1 wide room circuit, IL) and 25
are the first and second release circuits, 1G and 2 (the third are the first and second release valves forming the control valve, 21 and 27)
The detection means is controlled by 4M. 1. Place and warm +! t
L? I'm happy. .

Claims (1)

[Claims] (1) 1. In an air conditioner configured to heat the circulating refrigerant of a refrigerating tank with a refrigerant heating heat exchanger, the above-mentioned refrigerating tank is formed. A release circuit is provided from the discharge side of the compressor to the input side of the refrigerant heating heat exchanger to avoid bypassing the refrigerant and release the refrigerant, and this release circuit is provided with a control valve that is opened at the start of heating operation. An air conditioner characterized by: (2>--The feature κ' [claimed] characterized in that the two-note rj11 valve is configured to be controlled by a detection means for detecting a change in the state of the refrigerant. (3) The detection means is a temperature sensor that detects the temperature of an indoor heat exchanger forming the refrigeration cycle. (4) The air conditioner according to claim 2, wherein the detection means is a pressure detection sensor for detecting F1 leakage of the circulating refrigerant in the refrigeration cycle. ,.