CN100585285C - Air conditioner - Google Patents

Abstract

The invention relates to an air conditioner, especially relates to an air conditioner for increasing heat efficiency by increasing the superheat degree of refrigerant and suction pressure of compressor in cooling/heating air conditioner. The said air conditioner comprises a compressor, an outdoor heat exchanger, a branch pipe for connecting the discharge side of compressor and the discharge side of the outdoor heat exchanger.

Description

Air conditioner

Technical field

The present invention relates to a kind of air conditioner, relate in particular to the air conditioner that also can improve the refrigerating/heating dual-purpose of heating efficiency when under the lower situation of outdoor temperature, heating.

Background technology

Existing air conditioner as shown in Figure 1, comprise indoor set 3 and off-premises station 1, indoor set 3 is made of indoor heat converter 5 and indoor fan 7 again, and off-premises station 1 is drawn into outdoor heat converter 12 sides by the compressor 9 that is used for compressed refrigerant, outdoor heat converter 12 and with extraneous air and carries out the outdoor fan 15 of air draft, the channel switching valve 18 that is used to make the expansion valve that cold-producing medium expands and is used to change the cross valve form of the refrigerant flow channel that pipe arrangement flows.

And, the discharge side of compressor 9 be provided with prevent the cold-producing medium of being discharged once more adverse current discharge the check valve 21 of oral-laterals to compressor 9.

When the air conditioner with this structure moves as working the heat pump of the effect of heating, cold-producing medium is compressed to high-temperature high-pressure state in compressor 9, and move to indoor heat converter 5 by pipe arrangement and carry out condensation process, carry out heat exchange and to indoor transmission heat at this cold-producing medium that carries out condensation process at the relatively low room air of indoor heat converter 5 and temperature.

And, reduce pressure and expand at expansion valve through the cold-producing medium of condensation process, thereby temperature and pressure are descended, carry out heat exchange and after carrying out evaporation process, be inhaled into once more in the compressor 9 at outdoor heat converter 12 and outdoor air through the cold-producing medium of expansion process then.

As mentioned above, when moving as heat pump, its temperature of cold-producing medium of the outdoor heat converter 12 of flowing through has descended quite lowly, even therefore the cold air in winter also can carry out heat exchange, and carries out evaporation process from the absorption of air heat.

But, when external air temperature is very low, because its temperature is very little with the temperature difference of the cold-producing medium of the outdoor heat converter 12 of flowing through, therefore heat exchanger effectiveness reduces and makes cold-producing medium be difficult to evaporation, if and cold-producing medium fails fully to evaporate, the cold-producing medium that flow into compressor 9 is in a liquid state, and this may break down by induced to compressor 9, and the cold-producing medium suction pressure that flow into compressor 9 is also descended to some extent.

And, under this state, also need the increase degree of superheat and make its higher than usual additional cold-producing medium heating process, so that the cold-producing medium evaporation.

Summary of the invention

The present invention proposes in order to solve aforesaid problem, and its purpose is to provide a kind of air conditioner that can improve refrigerant superheat degree and suction pressure.

A kind of air conditioner of refrigerating/heating dual-purpose especially is provided, when this air conditioner moves as heat pump,, also can improve the suction pressure of cold-producing medium to compressor even outside air temperature drops to below the uniform temperature, and keep certain degree of superheat, thereby improve heating efficiency.

To achieve these goals, foundation air conditioner provided by the present invention comprises the isocon of compressor, outdoor heat converter, the described outdoor heat converter discharge side when the described compressor of connection is discharged side and heating operation.

And described compressor is set to a plurality of, and described a plurality of compressors are provided with the discharge pipe of discharging refrigerant, and described isocon is connected on the described discharge pipe.

And described discharge pipe comprises that the discharge branched pipe that is located at described a plurality of compressors respectively and described discharge branched pipe converge and the discharge collecting pipe that forms, and described isocon is connected on the described discharge branched pipe of part.

And described isocon is connected described discharge collecting pipe.

And described discharge branched pipe is provided with the check valve that prevents the cold-producing medium adverse current, and described isocon is connected the outlet side of described check valve.

And described air conditioner is the air conditioner of refrigerating/heating dual-purpose.

According to air conditioner provided by the present invention, comprise: a plurality of compressors; Outdoor heat converter; Be connected to described a plurality of compressor and discharge the discharge pipe of side; Described outdoor heat converter when being connected in heating operation is discharged the pipe arrangement of side; Described outdoor heat converter when described discharge pipe in coupling part and heating operation is discharged the isocon of side line, and the described outdoor heat converter when being directed to heating operation with the part cold-producing medium that is used for discharging from described compressor is discharged side line.

And described isocon is set to a plurality of.

Description of drawings

Fig. 1 is the generalized schematic of existing air conditioner;

The generalized schematic of working condition when Fig. 2 carries out heating operation for air conditioner provided by the present invention;

The generalized schematic of working condition when Fig. 3 carries out refrigerating operaton for air conditioner provided by the present invention;

Fig. 4 is the generalized schematic of another embodiment of the present invention;

Cold-producing medium pressure drop curves figure when Fig. 5 adopts the present invention and prior art for expression;

Fig. 6 is the curve map of the degree of superheat difference of expression the present invention and prior art;

Main symbol description: 32 for compressor, 35 is the first discharge branched pipe, and 36 is the second discharge branched pipe, and 37 for discharging collecting pipe, and 38 is outdoor heat converter, and 48,49 is isocon.

The specific embodiment

Below, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 2, the present invention relates to the air conditioner of refrigerating/heating dual-purpose, this air conditioner comprises off-premises station 30 and indoor set 50, and the discharge side that described off-premises station 30 comprises a plurality of compressors 32 of being used for compressed refrigerant, be located at described compressor 32 is with the check valve 34 of the cold-producing medium adverse current that is used to prevent discharged.

For convenience of explanation, the present invention is divided into the first compressor 32a and the second compressor 32b with a plurality of compressors, correspond respectively to the first compressor 32a on the said compressor 32 and be connected the first discharge branched pipe 35 and the second discharge branched pipe 36 with the second compressor 32b quantity, but the quantity of compressor 32 and discharge branched pipe 35,36 can be carried out any change according to refrigerating/heating ability or ambient conditions.

At this, the described first discharge branched pipe 35 and described second is discharged branched pipe 36 and is connected on the discharge collecting pipe 37, so that the cold-producing medium of discharging from a plurality of compressors 32 is flowed to the pipe.

In addition, described off-premises station 30 except described compressor 32, also comprise outdoor heat converter 38, with outdoor air be drawn into outdoor heat converter 38 sides outdoor fan 40, cold-producing medium is carried out the expansion valve 42 of puffing and is used to change refrigerant flow direction so that the channel switching valve that air conditioner freezes or heats.

And, described indoor set 50 comprises indoor heat converter 52 and room air is drawn into the indoor fan 54 that carries out air draft after the described indoor heat converter 52, and the inscape of described indoor set 50 inside is connected by pipe arrangement with the inscape of described off-premises station 30 inside.

In addition, described first discharges the special isocon 48 of connection on the branched pipe 35, described isocon 48 is connected on the pipe arrangement that links to each other with described outdoor heat converter, the tie point that connects described isocon 48 is preferably described first and discharges the A point of branched pipe 35 and be connected in the B point of the pipe arrangement of described outdoor heat converter 38, this is for when air conditioner provided by the present invention carries out heating operation as heat pump, the high-temperature high-pressure refrigerant of being discharged by the described first compressor 32a is mixed with low-temperature low-pressure refrigerant by described outdoor heat converter 38 discharges and increases the degree of superheat of the cold-producing medium that is drawn into described compressor 32, pressure and soakage.

Fig. 3 is the working condition schematic diagram of air conditioner provided by the present invention when carrying out refrigerating operaton, and described isocon 48 is discharged the A point branch of branched pipe 35 and is connected to the B point of the cold-producing medium suction side of described outdoor heat converter 38 first.

But, because refrigerant temperature and pressure that this moment, A point and B were ordered are almost equal, therefore cold-producing medium can not flow by described isocon 48 substantially, even, also equate not exist because of the problem that causes takes place to mix because of refrigerant condition by 2 by the described isocon 48 mobile refrigerant mixed that cause.

Illustrate that below with reference to Fig. 2 and Fig. 3 isocon 48 provided by the present invention preferably places the reason of above-mentioned position.

As shown in Figure 2, when air conditioner provided by the present invention heats as operation of heat pump and to the interior space, in described outdoor heat converter 38 evaporation process takes place.

But, if described isocon 48 is not connected in the discharge side (B point) of described outdoor heat converter 38, but be connected in the inflow side (C point) of outdoor heat converter 38, then discharge and mix with the cold-producing medium of the described expansion valve 42 of flowing through through the high-temperature high-pressure refrigerant of described isocon 48 by the described first compressor 32a.

This mixing phenomena just rose the pressure and temperature of cold-producing medium before flowing into described outdoor heat converter 38, the cold-producing medium of outdoor heat converter 38 and the mean temperature difference between the outdoor air of flowing through thus reduces, thereby cause amount of heat transfer to reduce from outdoor air to cold-producing medium, this means that also heating capacity reduces, and therefore described isocon 48 can not be connected the C point.

The situation that described isocon 48 is connected to the suction side of described indoor heat converter 52 or discharges side is discussed below.When isocon 48 was connected the suction side of indoor heat converter 52, refrigerant temperature and pressure were almost equal, therefore from the technical standpoint nothing in all senses.

And, when described isocon 48 is connected to the discharge side of described indoor heat converter 52, to temperature and pressure be descended become in the liquid cold-producing medium and inject high temperature and high pressure gaseous refrigerant carrying out condensation process by described indoor heat converter 52, this can reduce the puffing effect in the described expansion valve 42, and in expansion process, produce noise, and make the degree of supercooling reduction of cold-producing medium and cause whole heating efficiency to descend.

Therefore, described isocon 48 preferably is connected to the discharge side (B point) of described outdoor heat converter 38.

In addition, connect the outlet side that the described first A point of discharging branched pipe 35 and described isocon 48 preferably is located at the described first check valve 34a, this is that the cold-producing medium adverse current of discharging in order to prevent is in the described first compressor 32a.

In addition, as shown in Figure 3, if air conditioner provided by the present invention carries out refrigerating operaton to the interior space, then outdoor heat converter 38 is as condenser, and described indoor heat converter 52 is as evaporimeter.

But the cold-producing medium that the cold-producing medium of the described outdoor heat converter 38 of flowing through is discharged side (C part) has passed through condensation process in described outdoor heat converter 38, therefore compares the decompression state that is in to a certain degree with the state when described compressor is discharged.

In this case, if partly connect described isocon 48 at described C, situation during then with the above-mentioned discharge side that described isocon 48 is connected to when the heating operation described indoor heat converter 52 is identical, directly the high temperature and high pressure gaseous refrigerant of being discharged by the described first compressor 32a flow into the discharge side (C point) of described outdoor heat converter 38 according to the pressure reduction described isocon 48 of flowing through, this causes the refrigerant temperature that is condensed and pressure to rise, thereby harms the supercooled state of cold-producing medium and finally make cold-producing medium be in the noncondensable gas state.

And, if in liquid refrigerant, sneak into gaseous refrigerant, then when carrying out the puffing process, described expansion valve 42 reduces expansion efficiency in the generation noise, this will cause refrigerating efficiency to reduce.

Though described isocon 48 does not cut much ice when refrigerating operaton,, aforesaid reason discharges the A part of branched pipe 35 and the suction side (B part) of described outdoor heat converter 38 because of need being connected to described isocon 48 described first.

In addition, Fig. 4 is under the state that moves as heat pump at air conditioner, except being connected to described first, described isocon 48 discharges the schematic diagram that other isocon 49 is set the branched pipe 35 again, this isocon 49 is from a conflux part (D part) branch of the described discharge collecting pipe 37 that is a pipeline of described first branched pipe 35 and second branched pipe 36, and partly is connected with the E of the pipe arrangement that is connected to described outdoor heat converter 38.

The reason that a plurality of isocons 48,49 are set is, by the low-temperature low-pressure refrigerant of discharging from described outdoor heat converter 38 is repeatedly mixed with the high-temperature high-pressure refrigerant that described compressor 32 is discharged, thereby the degree of superheat, suction pressure and refrigerant amount when further increasing cold-producing medium and flowing into described compressor 32 further improve heating efficiency thus.

The course of work of air conditioner provided by the present invention is described with reference to the accompanying drawings.

As shown in Figure 2, when air conditioner provided by the present invention moved as heat pump, cold-producing medium was by indoor heat converter 52 sides that move to described indoor set after the described compressor 32 boil down to high-temperature high-pressure refrigerants.

At this moment, the work by described indoor fan 54 makes the indoor cold air of inflow and high temperature refrigerant carry out heat exchange in described indoor heat converter 52, thus to indoor supplying high temperature air.

Then, because the cold-producing medium that causes temperature and pressure to descend to interior space discharges heat, through described expansion valve 42 time, carry out puffing temperature and pressure is further descended, and under this state, flow in the described outdoor heat converter 38.

The cold-producing medium that flow into described outdoor heat converter 38 carries out heat exchange with the outdoor air that flows into by described outdoor fan 40, be lower than the temperature of outdoor air in this temperature owing to cold-producing medium, therefore the heat of cold-producing medium absorption chamber outer air and evaporating, and the air that is absorbed heat is discharged by described outdoor fan 40 under the state that temperature descends.

And the cold-producing medium of discharging from described outdoor heat converter 38 with the state of evaporation mixes with the high-temperature high-pressure refrigerant that is guided by described isocon 48, and the degree of superheat and the pressure of cold-producing medium will increase at the joint place this moment.

Especially, when the temperature of outdoor air sharply descends and when diminishing with the difference of the temperature of the cold-producing medium of the described outdoor heat converter 38 of flowing through, cold-producing medium can not evaporate cold-producing medium with the relative reduction of heat exchanger effectiveness between the outdoor air smoothly, and the degree of superheat and the suction pressure of the cold-producing medium of being discharged by described outdoor heat converter 38 are reduced.

And this moment, if the guiding of the part high-temperature high-pressure refrigerant of being discharged by the described first compressor 32a by described isocon 48 flow into described outdoor heat converter 38 and discharges in the pipe arrangement of sides, the degree of superheat and the pressure of the cold-producing medium of intersection are increased, and refrigerant amount also increases, and is inhaled into the cold-producing medium physical property of described compressor 32 and improves heating efficiency on the whole thereby change.

And, as shown in Figure 4,, the effect of improving described heating efficiency is doubled if a plurality of described isocons 48,49 are set.

In addition, as shown in Figure 2, if only discharging under the state that connects described isocon 48 on the branched pipe 35 described first makes air conditioner move as heat pump, and do not move the described first compressor 32a this moment, and only move the described second compressor 32b, then the cold-producing medium of discharging from the described second compressor 32b is without described isocon 48, but directly passes through described indoor heat converter 52, described expansion valve 42 and described outdoor heat converter 38 successively, thereby heats.

So, part compressor in only moving described a plurality of compressor 32 and carry out part when operation, the relative capacity of described indoor heat converter 52 and outdoor heat converter 38, promptly indoor heat converter 52 and outdoor heat converter 38 capacity increase with respect to compressor 32 working capacities.

Promptly, when only moving the described second compressor 32b, the refrigerant amount that the refrigerant amount that is flowed by described second compressor 32b compression is flowed when moving the first compressor 32a and the second compressor 32b lacks, and increases relatively than the heat-exchange capacity of this refrigerant amount indoor heat converter 52 and outdoor heat converter 38.

Therefore, when air conditioner provided by the present invention moves as heat pump, even the temperature that the temperature of extraneous air is low to make outdoor air is than usual little with the difference of flowing through as the refrigerant temperature of the outdoor heat converter 38 of evaporimeter, but lack when the refrigerant amount of described outdoor heat converter 38 is than all compressors 32 of operation owing to flow through, therefore can make all evaporations in outdoor heat converter 38 of cold-producing medium.

At this moment, even the high-temperature high-pressure refrigerant that flows into through described isocon 48 of mixed flow not also can be kept the degree of superheat of cold-producing medium and can not have much impact to heating performance.

Fig. 5 is drawn into the curve map that the refrigerant pressure of described compressor changes, the situation when this graphical representation only is provided with an isocon as shown in Figure 2 when described isocon being set and described isocon is not set for expression.

Refrigerant pressure when P1 represents not have isocon in the curve map, the refrigerant pressure when P2 represents to have isocon, when flowing into high-temperature high-pressure refrigerant when being provided with isocon, its pressure rises at the meet of isocon, and the pressure that rise this moment is represented with Δ P.

And Fig. 6 represents the variation of refrigerant superheat degree, if refrigerant superheat degree T1 when relatively not having isocon and the refrigerant superheat degree T2 when having isocon can learn then to change identically with pressure that the degree of superheat is at the meet rising Δ T of isocon.

As mentioned above, when high-temperature high-pressure refrigerant mixes with the low-temperature low-pressure refrigerant of evaporation and is inhaled into compressor, can increase suction pressure, refrigerant amount and the degree of superheat of cold-producing medium, thus the phenomenon of the heating capacity decline that produces when air conditioner moves as heat pump, can prevent that external air temperature from sharply descending the time.

Especially, when making diminish relative of temperature of extraneous air, prevent that by the pressure and the degree of superheat that increases cold-producing medium heating capacity from descending as mentioned above with the difference of the refrigerant temperature of the described outdoor heat converter of flowing through when rapid decline of outside air temperature.

In sum, the present invention is by the compensation degree of superheat and suction pressure, thereby can improve heating capacity, especially make when external air temperature is relative with the difference of the refrigerant temperature of the described outdoor heat converter of flowing through to diminish rapid decline of outside air temperature, prevent that by the pressure and the degree of superheat that increases cold-producing medium heating capacity from descending.

Claims (2)

1, a kind of air conditioner is characterized in that comprising: compressor; Outdoor heat converter; Described outdoor heat converter when connecting described compressor discharge side and heating operation is discharged a plurality of isocons of side,

Described compressor is set to a plurality of, and described a plurality of compressors are provided with the discharge pipe of discharging refrigerant,

Described discharge pipe comprises that the discharge branched pipe that is located at described a plurality of compressors respectively and described discharge branched pipe converge and the discharge collecting pipe that forms, one of them isocon in described a plurality of isocon is connected on the described discharge branched pipe of part, and another isocon is connected described discharge collecting pipe.

2, air conditioner according to claim 1 is characterized in that described air conditioner is the air conditioner of refrigerating/heating dual-purpose.

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