KR100973916B1 - Air conditioner - Google Patents

Abstract

There is provided an air conditioner having a plurality of paths in which the flow of the refrigerant between the respective paths of the classifier corresponding to the heat exchanger for the air conditioner is reversed and appropriately controlled to improve the heat exchange performance. The air conditioner includes a compressor, a four-way valve, an outdoor heat exchanger, a tightening device, and an indoor heat exchanger having a plurality of passes. Each member is connected in order by the refrigerant piping, and the refrigerant circuit is comprised. Between the indoor heat exchanger provided with a some path | pass and a tightening apparatus, the classifier provided with the some path | pass is provided. A refrigerant flow rate regulating valve is provided in each of the plurality of passes of the classifier. More refrigerant is distributed in comparison to other passes for a predetermined path in which the processing capacity is large in a predetermined operating state and the refrigerant temperature at the outlet of the indoor heat exchanger becomes high.

Description

Air Conditioner {AIR CONDITIONER}

TECHNICAL FIELD The present invention relates to an air conditioner, and more particularly, to a configuration of an air conditioner having a classifier for properly classifying refrigerant in a plurality of passes in an indoor heat exchanger of an air conditioner.

FIG. 5 shows a configuration of a general wall-mounted air conditioner (indoor) 21 in which a cross flow fan 29 is employed. In FIG. 5, the first and second two air intake grills 23 and 24 are formed on the upper and upper surfaces of the main body casing 20 of the air conditioner 21, respectively. The air blowout port 25 is provided in the corner part provided below the front surface of the main body casing 20.

In the main body casing 20, a blowing passage 27 is provided from the air intake grills 23 and 24 toward the air outlet 25. In the upstream region of the blowing passage 27, an indoor heat exchanger 26 having a V-shaped cross section facing the first and second air intake grills 23 and 24 is provided. The indoor heat exchanger 26 is a lambda type heat exchanger. In the downstream region of the air passage 27, a cross flow fan 29, a tongue portion 22, and a scroll portion 30 are provided in parallel. The vortex fan housing is formed by the tongue portion 22 and the scroll portion 30. In the openings 30a and 22a of the tongue part 22 and the scroll part 30, the impeller (fan rotor) 29a of the cross flow fan 29 is provided so that it may rotate along the arrow direction of FIG.

The tongue part 22 is provided in the position which opposes the 2nd air suction grille 24, and has predetermined length along the outer diameter of the impeller (fan rotor) 29a of the crossflow fan 29. As shown in FIG.

The lower part of the tongue part 22 is provided below the indoor heat exchanger 26, and is continuous with the airflow guide part 22b which also serves as the drain pan. The downstream portion of the airflow guide portion 22b extends toward the air outlet port 25 together with the downstream portion 30b of the scroll portion 30, and has an air blowout passage 28 having a diffuser structure as shown. ). Thereby, the air flow blown out from the impeller (fan rotor) 29a of the cross flow fan 29 is taken out from the air blower outlet 25 efficiently.

The wind direction changing plate 31 is provided in the air blowing passage 28 located between the scroll portion 30 and the air flow guide portion 22b provided below the tongue portion 22.

The tongue part 22 has the shape shown in FIG. And the flow of the air which reaches the air outlet 25 from the impeller (fan rotor) 29a of the cross flow fan 29 via the indoor heat exchanger 26 is shown by the dashed-line arrow in FIG. As described above, the tube is curved along the rotational direction of the impeller (fan rotor) 29a and flows out in a direction perpendicular to the rotation axis of the impeller (fan rotor) 29a. Thereafter, the flow of air is bent toward the air blower outlet 25 along the air blower passage 28 and taken out from the front of the air conditioner 21.

As for the indoor heat exchanger 26 for an air conditioner which has such a structure, as shown in FIG. 5, the indoor heat exchanger 26 is divided into A part, B part, C part, and D part, Is analyzed. As a result, the wind speed of the D portion which directly faces the second air intake grill 24 directly from the front side is higher, and the wind speed of the C portion that is obliquely opposed to the first air intake grill 23 is lower than that of the D portion. In the part B which is covered by a part of the upper part of the front surface of the main body casing 20, and air does not flow in a straight line, the wind speed is lower than the part C. In the part A where air is interrupted by the tongue part 22, the wind speed falls further than the part B.

In the indoor heat exchanger 26 having a plurality of passes in the air conditioner as described above, in order to distribute the refrigerant flowing into the indoor heat exchanger 26 main body to each path of the indoor heat exchanger 26 main body, generally, A classifier 6 having a plurality of sorting passes 7a and 7b as shown in FIG. 6 is provided. In this sorter 6, the distribution ratio of the refrigerant | coolant of each sorting | passing path 7a, 7b is determined according to the rated operation. At the inlet of the fractionator 6, an expansion valve V and a refrigerant inlet 6a are provided. In the indoor heat exchanger 26 at low load, the fractionation path 7a passes through the high wind speed portion 26a, and the fractionation path 7b passes through the low wind speed portion 26b.

Therefore, as represented by the thickness of the line of the arrow in FIG. 6, at the time of rated operation, the refrigerant temperature at the outlet of each pass 8A, 8B provided at the outlet of the indoor heat exchanger 26 becomes substantially the same. However, when a low load (partial load) occurs with a small amount of refrigerant, as described above, the following problem occurs due to the influence of different wind speed distribution depending on the position of the blowing passage of the indoor heat exchanger 26. That is, for example, as shown in the graph of FIG. 7, the refrigerant temperature at the outlet of the high-pass paths 7a and 8A is high because there is room in the heat exchange capacity. On the other hand, the coolant temperature at the exit of the paths 7b and 8B with low wind speeds is lower than the coolant temperature at the exit of the paths 7a and 8A because the heat exchange capacity becomes inadequate (ΔT in FIG. 7). Reference). In the graph of FIG. 7, paths 7a and 8A having high wind speed are indicated by white paper, and paths 7b and 8B having low wind speed are indicated by dot paper.

As one of methods for solving such a problem, as shown in FIG. 8, for example, the refrigerant flow rate adjusting valve V ₁ is provided in the paths 7b and 8B in which the temperature of the outlet drops at least at the time of low load, and thus the flow rate. This is being adjusted. Thereby, as shown, for example in the graph of FIG. 9, the temperature (dryness) at the exit of each path | pass 7a, 8A, and the temperature (dryness) at the exit of 7b, 8B are (For example, refer patent document 1). In the graph of FIG. 9, a path having a high wind speed is indicated by white paper, and a path having a low wind speed is indicated by dot paper.

[Patent Document 1: Japanese Patent Application Laid-open No. Hei 5-118682]

However, in such a structure, especially when the drying degree indicated by increasing the ratio of a dark part in FIG. 6 and FIG. 8 is high, the capability in low load does not improve that much.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner having a plurality of passes, which adequately controls the drift of a refrigerant between each pass of a classifier corresponding to a heat exchanger for an air conditioner, thereby improving heat exchange performance.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, according to the 1st aspect of this invention, the air conditioner provided with the compressor, the four-way valve, the outdoor heat exchanger, the tightening apparatus, and the indoor heat exchanger which has a some path | pass is provided. Each said member is connected one by one by refrigerant piping, and the refrigerant circuit is comprised. Between the said indoor heat exchanger provided with the some path | pass and the tightening apparatus, the classifier provided with the some path | pass is provided. A refrigerant flow rate regulating valve is provided in each of the plurality of passes of the classifier. It is comprised so that more refrigerant | coolant may be distributed compared with another path | pass in the predetermined | prescribed path | pass which a processing capacity is big in a predetermined | prescribed operation state, and the refrigerant | coolant temperature at the exit of the said indoor heat exchanger becomes high.

According to this structure, in a predetermined | prescribed operation state, more refrigerant | coolant is distribute | distributed more actively to the path | route with a space with a processing capability, and the in-pipe flow velocity of the said path | pass is raised. In addition, the difference between the temperature at the outlet of the indoor heat exchanger and the suction temperature is increased. As a result, the capacity of the indoor heat exchanger is improved to improve the freezing capacity.

Preferably, the predetermined operating state is an operating state at low load, and at this low load, the refrigerant flow rate regulating valve in a path where the processing capacity is small and the refrigerant temperature at the outlet of the indoor heat exchanger is lowered is tightened, and the processing capacity is reduced. It is comprised so that a lot of refrigerant flows in the predetermined | prescribed path which becomes large and the refrigerant | coolant temperature in the exit of the said indoor heat exchanger becomes high.

According to this configuration, at the time of low load where the total refrigerant flow rate decreases, the refrigerant flow rate regulating valve of the path where the processing capacity is small and the refrigerant temperature at the outlet of the indoor heat exchanger is lowered is tightened. And the flow rate of the pipe | tube of a said path | pass becomes high by distributing more refrigerant | coolant to the predetermined | prescribed path | pass with a high wind speed with a processing capacity. In addition, the difference between the temperature at the outlet of the indoor heat exchanger and the suction temperature is increased. As a result, the capacity of the heat exchanger is effectively improved and the refrigerating capacity is improved.

Preferably, the predetermined path is a path having a high wind speed, and at the time of low load, the refrigerant flow rate regulating valve of the path having a low wind speed is tightened, the heat exchange capacity is sufficient, and a large amount of refrigerant flows through the path having a high wind speed. It is configured to. According to this configuration, at the time of low load where the total refrigerant flow rate decreases, there is no margin in processing capacity, the refrigerant flow rate adjustment valve in a low wind speed pass is tightened, there is a margin in heat exchange capacity, and flows through a portion having high wind speed. By distributing more refrigerant to the path, the flow velocity in the tube of the path is increased. In addition, the difference between the temperature at the outlet of the indoor heat exchanger and the suction temperature is increased. As a result, the capacity of the heat exchanger is effectively improved and the refrigerating capacity is improved.

Preferably, the predetermined operating state is an operating state at the rated load, and at this rated load, the refrigerant flow rate regulating valves in each pass are opened to be configured so that the capability of the heat exchanger is fully exhibited. According to this structure, in the operation state at the rated load, all the refrigerant flow volume control valves of each pass open, and the capability of a heat exchanger can be fully exhibited.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the refrigeration circuit of the air conditioner which concerns on the 1st Embodiment of this invention.

Fig. 2 is a diagram showing the configuration and operation of a heat exchanger having a plurality of passes in the indoor unit of the air conditioner and a classifier corresponding to each pass of the heat exchanger.

FIG. 3 is a graph showing the temperature at the outlet of the indoor heat exchanger by the classifier shown in FIG. 2 in comparison with the rated time and the low load.

Fig. 4 is a diagram showing the configuration of a heat exchanger having a plurality of passes in the indoor unit of the air conditioner according to the second embodiment of the present invention, and a classifier corresponding to each pass of the heat exchanger.

5 is a diagram illustrating a configuration of an indoor unit of an air conditioner according to the related art.

Fig. 6 is a diagram showing the configuration and operation of a heat exchanger having a plurality of passes in an indoor unit of an air conditioner and a classifier corresponding to the heat exchanger.

7 is a graph showing the temperature at the outlet of the indoor heat exchanger by the classifier shown in FIG. 6 in comparison with the rated load and the low load.

FIG. 8 is a diagram showing the configuration and operation of a heat exchanger having a plurality of passes in an indoor unit of a conventional air conditioner in which an outlet temperature measure has been carried out, and a classifier corresponding to the heat exchanger.

FIG. 9 is a view showing the temperature at the outlet of the indoor heat exchanger by the classifier shown in FIG. 8 in comparison with the rated time and the low load.

Best Mode for Carrying Out the Invention

(Best embodiment)

1 and 2 show the configuration of the refrigerating circuit and the classifier portion of the air conditioner according to the first embodiment of the present invention, and FIG. 3 shows the operation and effect of this configuration. In the structure of this embodiment, in order to simplify description, the wind speed range of the heat exchanger part 26 shown in FIG. 5 is roughly divided into two areas, the low wind speed part A, B, and the high wind speed part C, D. Correspondingly, the case where the number of passes of the classifier 6 portion is two correspondingly is illustrated.

As shown in FIG. 1, the air conditioner includes an outdoor unit 1 and an indoor unit 10. The outdoor unit 1 includes a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, and a tightening device 5. The indoor unit 10 includes a classifier 6, an inlet 6a of refrigerant flows into the classifier 6, a first classifying path 7a of the classifier 6, a second classifying path 7b of the classifier 6, An indoor heat exchanger 26, a first pass 8A located at the outlet of the indoor heat exchanger 26, a second pass 8B located at the outlet of the indoor heat exchanger 26, and an expansion valve V; have. Each member is connected by the 1st refrigerant pipe 9A and the 2nd refrigerant pipe 9B, and the reversible refrigerant circulation circuit as shown in FIG. 1 is comprised.

The expansion valve V and the separator 6 are provided between the indoor heat exchanger 26 and the tightening device 5. First and second refrigerant flow rate regulating valves V ₁ and V ₂ each consisting of an electromagnetic valve capable of electrically opening degree adjustment are provided in the first and second flow paths 7a and 7b of the classifier 6. It is. In the predetermined operation state, more refrigerant is distributed to any one of the predetermined paths 7a or 7b in which the processing capacity is large and the refrigerant temperature at the outlet of the indoor heat exchanger 26 is increased. Control of the coolant times the amount is carried out, for example, whereby the first and second refrigerant flow amount regulation valve V _1, V ₂ is controlled by the opening of the individual with a predetermined control unit having a microcomputer.

In this case, the predetermined operation state is, for example, an operation state under low load in which the flow rate of the refrigerant to the refrigerant inlet 6a of the classifier 6 decreases. For example, as shown in FIG. 2, when the low speed windage part 26b passes through the 2nd sorting path 7b, and the high wind speed part 26a passes through the 1st sorting path 7a, at the time of low load. In other words, when the wind speed in the second flow path 7b is low and the wind speed in the first flow path 7a is high, when the load is low, for example, the second airflow capacity is low and the second air speed is low. The valve opening degree of the refrigerant flow rate regulating valve V ₂ corresponding to the dividing path 7b is reduced. And more refrigerant | coolant flows with respect to the 1st flow path 7a with a high heat exchange capacity, and high wind speed compared with the 2nd flow path 7b.

In such a low load at which the total refrigerant flow rate decreases as described above, the refrigerant flow rate adjustment valve V ₂ of the _second flow path 7b having low wind speed is tightened and there is a margin in the processing capacity. By distributing more refrigerant to this higher first flow path 7a than in the second flow path 7b, the flow velocity in the tube of the first flow path 7a with high wind speed is increased. As shown in the graph of FIG. 3, the difference ΔT between the temperature at the outlet of the indoor heat exchanger 26 and the suction temperature is increased. As a result, the capacity of the indoor heat exchanger 26 is improved to improve the freezing capacity. In the graph of FIG. 3, the 1st sorting path 7a is shown by the white paper, and the 2nd sorting path 7b is shown by the dot paper.

On the other hand, at the rated load, all of the first and second refrigerant flow rate regulating valves V ₁ and V ₂ open to fully exhibit the heat exchange capacity of the indoor heat exchanger 26. As a result, according to the present embodiment, an indoor heat exchanger for an air conditioner (compared to the conventional configuration of simply making the temperature at the outlet of each pass 8A, 8B of the indoor heat exchanger 26 the same) The heat exchange capacity of 26) can be improved more effectively.

(Best embodiment 2)

4 shows the configuration of the classifier and the indoor heat exchanger portion of the air conditioner according to the second embodiment of the present invention. In the configuration of the first preferred embodiment described above, in order to make the description clear, for example, the wind speed distribution range of the indoor heat exchanger 26 of FIG. 6 is the low wind speed A, B and the high wind speed C, D. The case where a refrigerant | coolant is divided into two flow paths 7a and 7b of 1st and 2nd is classified into two wind speed zones. On the other hand, the best embodiment 2 has the following structures as a feature. That is, the wind speed range of the heat exchanger 26 of FIG. 6 is divided in detail into four wind speed ranges, for example, low wind speed part A part, B part, C part, and high wind speed part D part. The 1st, 2nd, 3rd, and 4th sorting paths 7a-7d are provided corresponding to each wind speed range, and similarly to 1st Embodiment 1, the 1st-2nd sorting paths 7a-7d are provided in each sorting path 7a-7d. 4 Refrigerant flow control valves V ₂₁ to V ₂₄ are installed.

Thus, even in the case where the first to fourth flow paths 7a to 7d are provided, at least at the time of low load at which the total refrigerant flow rate decreases, there is no room for processing capacity and the first to the low wind speeds. The first to third refrigerant flow rate regulating valves V ₂₁ to V ₂₃ in the three flow paths 7a to 7c are tightened. And a lot of refrigerant is distributed to the 4th flow path 7d which has a sufficient processing capacity and has a high wind speed. As a result, the flow rate in the pipe of the fourth flow path 7d is increased, and the difference between the temperature and the suction temperature in the passage of the indoor heat exchanger 26 is increased, so that the capacity of the indoor heat exchanger 26 is improved. Freezing capacity is improved. At the rated load, each of the refrigerant flow rate regulating valves V ₂₁ to V ₂₄ of the first to fourth flow paths 7a to 7d is fully opened, and the capacity of the indoor heat exchanger 26 is sufficiently exhibited.

Claims (4)

It consists of a compressor, a four-way valve, an outdoor heat exchanger, a fastening device, and an indoor heat exchanger having a plurality of paths, which are sequentially connected by a refrigerant pipe to form a refrigerant circuit, and provided with the plurality of paths. In the air conditioner which provides the classifier provided with the said some path between an indoor heat exchanger and a fastening device, A refrigerant flow rate adjustment valve is provided in each of the plurality of passes of the classifier, At low load, regardless of the outlet refrigerant temperature, the larger the path where the processing capacity is relatively small, the outlet refrigerant temperature of the indoor heat exchanger is relatively low, and the wind speed is relatively small, the larger the refrigerant flow regulating valve, In the path where the processing capacity is relatively large, the refrigerant temperature at the outlet side of the indoor heat exchanger is relatively high, and the wind speed is relatively high, the amount of the refrigerant flow rate adjustment valve is reduced to allow a relatively large amount of refrigerant to flow. At the rated load, the air conditioner opens the refrigerant flow rate adjustment valve of each pass, and exhibits the capability of the indoor heat exchanger completely. delete delete delete

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