JP5513093B2 - Heat exchanger, refrigeration cycle equipment - Google Patents

Description

  The present invention relates to a heat exchanger and a refrigeration cycle apparatus, and more particularly to a heat exchanger having an improved shape of a cut and raised formed in a heat transfer fin and a refrigeration cycle apparatus using the heat exchanger.

  This type of heat transfer fin tube type indoor heat exchanger is mainly used in an air conditioner, and is provided with one or more heat transfer tubes in the heat exchange air flow direction and orthogonal to the heat exchange air flow direction of each row. In order to improve the performance, a cut-and-raised portion is provided between the heat transfer tubes.

  In recent years, an air conditioner has been used as a heat pump for heating operation at a low outside air temperature. During this cooling operation, frost is formed on the heat transfer fins, and the heat transfer fins are clogged by the stacked frost, and ventilation is not performed. Reduced heating capacity.

  Therefore, a slit-like cut-out is arranged on the leeward side from the center of the heat transfer fin, and a wave-like bent part that is cut up on the windward side and does not have a leading edge is installed. There has been proposed a heat exchanger that prevents performance degradation by securing a sufficient ventilation path to the cut-and-raised shape (see, for example, Patent Document 1).

JP 2001-91101 A

  However, the heat exchanger described in Patent Document 1 has a large amount of heat transfer, and the leeward side edge (rear edge) of the upwind side where the frost formation is most concerned is adjacent to the heat transfer tube. Because it is located far from the line connecting the centers of the frost, if frost is formed on the leeward side edge, the heat from the heat transfer tube through which the high-temperature fluid flows is difficult to transfer during the defrosting operation, and it can be defrosted in a short time. There is a problem that heating performance is deteriorated due to clogging of heat transfer fins.

  The present invention has been made in consideration of the above-described circumstances. Even when frost is formed on the leeward edge of the upwind side, heat from the heat transfer tube through which a high-temperature fluid flows during defrosting operation is provided. An object of the present invention is to provide a heat exchanger suitable for an air conditioner that is easy to transmit and can be defrosted in a short time, has no clogging of heat transfer fins, and has improved heating performance.

  In addition, even if frost is formed on the leeward edge of the upwind side, the heat from the heat transfer tube through which the high-temperature fluid flows can be easily transferred during the defrosting operation, and the heat transfer can be performed in a short time. An object of the present invention is to provide a refrigeration cycle apparatus provided with a heat exchanger suitable for an air conditioner without fin clogging and improving heating performance.

The present invention has been made in consideration of the above-described circumstances, and the heat exchanger according to the present invention is arranged side by side with predetermined gaps, distributes heat exchange air along these gaps, and cuts off. A plurality of heat transfer fins provided with ridges, and heat transfer fins adjacent to each other in a direction perpendicular to the flow direction of the heat exchange air of these heat transfer fins, and heat exchange inside In the heat exchanger having a heat transfer tube through which the medium is conducted, the cut and raised portions are provided in a plurality of rows in the flow direction of the heat exchange air, and the cut and raised portions on the windward side of the raised portions are on the windward end. The edge is located on the leeward side of the heat transfer tube, and the protruding height from the fin surface increases from the leeward edge toward the leeward edge, and only the leeward edge is cut and opened. It is, and the leeward-side edge is highest Extruded Rutotomoni provided adjacent the fin surface Located on the line connecting the centers of the heat transfer tube, the cut and raised on the leeward side of the cut-and-raised is provided with a plurality, it is formed in each windward side and the leeward side slit shape opposite edges is cut in It is characterized by.

  The refrigeration cycle apparatus according to the present invention is a refrigeration cycle apparatus including a compressor, a heat source side heat exchanger, an expansion device, and a use side heat exchanger, and at least one of the heat source side heat exchanger and the use side exchanger. Is the above heat exchanger.

  According to the heat exchanger of the present invention, even if frost is formed on the leeward edge of the upwind cut and raised side, the heat from the heat transfer tube through which the high-temperature fluid flows is easily transferred during the defrosting operation and can be removed in a short time. It is possible to provide a heat exchanger suitable for an air conditioner that can be frosted and has improved heating performance without clogging of heat transfer fins.

  In addition, according to the refrigeration cycle apparatus according to the present invention, even when frost is formed on the leeward edge of the upwind side, heat from the heat transfer tube through which the high-temperature fluid flows is easily transmitted during the defrosting operation for a short time. It is possible to provide a refrigeration cycle apparatus suitable for an air conditioner, which can be defrosted and can improve heating performance without clogging of heat transfer fins.

The conceptual diagram of the heat exchanger which concerns on one Embodiment of this invention, and the refrigerating-cycle apparatus using the same. The perspective view of the heat exchanger which concerns on one Embodiment of this invention. The top view of the heat-transfer fin used for the heat exchanger which concerns on one Embodiment of this invention. Sectional drawing which follows the AA line of FIG. The top view which shows the frosting state after the defrost which expanded the cut-and-raised part of the heat-transfer fin used for the heat exchanger which concerns on one Embodiment of this invention. The perspective view which expands and shows the cut-and-raised part of the heat-transfer fin used for the heat exchanger which concerns on one Embodiment of this invention.

  A heat exchanger according to an embodiment of the present invention and a refrigeration cycle apparatus using the same will be described with reference to the drawings.

  As shown in FIG. 1, the refrigeration cycle apparatus 21 according to the present invention is used in, for example, an air conditioner, and is a compressor 22, a four-way valve 23, and an outdoor heat exchanger (heat source side heat exchanger). The heat exchanger 1 of the form, the expansion device 24, and the indoor heat exchanger (use side heat exchanger) 25 are sequentially connected via the refrigerant pipe P, and are provided with a heat pump type refrigeration cycle.

  In FIG. 1, the solid line arrows indicate the refrigerant flow during the cooling operation, and the broken line arrows indicate the refrigerant flow during the heating operation.

  The compressor 22, the four-way valve 23, the heat exchanger 1 and the expansion device 24 are disposed in the outdoor unit 31, and the indoor heat exchanger 25 is disposed in the indoor unit 32.

  As shown in FIG. 2, the present heat exchanger 1 is arranged in parallel with a predetermined pitch, and a plurality of heat transfer fins 2 that circulate heat exchange air through the gaps G, and these heat transfer fins 2. It is provided with a heat transfer tube 4 which is drilled and is provided so as to penetrate the fin hole 3 in a heat transfer manner and which conducts a heat exchange medium.

  As shown in FIG. 3, the heat transfer fins 2 are made of aluminum having a strip shape with a thickness of 0.1 mm, for example, and a large number of fin holes 3 are formed on the center line L at equal intervals in the fin longitudinal direction. A fin collar 3 a is erected around the fin hole 3.

  The heat transfer tubes 4 are formed in, for example, one row, and are heat-fitted to the heat transfer fins 2 through the fin collar 3a.

  In addition, the arrow in each figure shows the flow of air.

  When using the heat exchanger 1 as an outdoor heat exchanger like this embodiment, the heat-transfer fin 2 is arrange | positioned in the up-down direction, and the heat-transfer tube 4 is extended in the left-right direction.

  As shown in FIG. 3 and FIG. 4, the heat transfer fins 2 are provided with a plurality of rows of cuts 5 in the flow direction of heat exchange air.

  The upwind cut 6 on the upwind side of the cut up 5 has a substantially isosceles trapezoidal shape projecting upward in a plan view, and its leg has an arc shape, and only the leeward side edge 6b on the leeward side is cut. Thus, the opening 7 is opened.

  Of the cuts 5, two large and small leeward cuts 8 and 9 are provided, both of which are slits in which the windward side edges 8 a and 9 a on the windward side and the leeward side edges 8 b and 9 b on the leeward side are cut. It is formed in a shape.

  Further, the heat transfer fin 2 has a windward front reinforcing bead 10 along the windward front edge, and a windward rear reinforcing bead 11 along the windward rear edge, which is the same as the raised part 5. Protruding in the direction.

  As shown in FIGS. 5 and 6, the cut and raised portion 6 has a protruding height from the fin surface 2 a that increases from the windward side edge toward the leeward side edge 6 b, that is, has a linear upslope surface. Is formed. Note that the upward gradient is not limited to a straight line as in the present embodiment, but may be a curved or stepped upward gradient.

The leg portions 6 c, 8 c, 9 c of the cut and raised portions 6 and 8 and 9 have an arc shape in the direction along the heat transfer tube 4, and the arc center c ₂ of the arc is from the center c _{1 of the} heat transfer tube 4. Is also eccentric to the outside.

  Next, the operation of the heat exchanger according to one embodiment of the present invention will be described by taking as an example a case where the operation of the air conditioner is installed in the refrigeration cycle apparatus and the air conditioner is heated.

  When the air conditioner is operated for heating, as shown in FIG. 1, the refrigerant that has been compressed by the compressor 22 and has become high temperature and high pressure flows into the indoor heat exchanger 25 through the four-way valve 23 and dissipates heat to the indoor air. Heat the room air to heat the room.

  The refrigerant that has radiated heat to the room air and has become a liquid phase is decompressed by the expansion device 24 and flows into the heat exchanger 1 that is an outdoor heat exchanger.

  On the other hand, the outside air (air) blown by the blower flows into the gap G between the heat transfer fins 2 from the windward side of the heat transfer fins 2, as shown in FIGS. 2, 4, and 5. The outside air that has flowed into the gap G flows downstream along the heat transfer fins 2.

  While the outside air flows along the heat transfer fins 2, it evaporates in the heat transfer tubes 4 of the heat exchanger 1, exchanges heat with the heat transfer fins 2 cooled via the heat transfer tubes 4, and takes heat away ( Pumped up).

  At the time of heat exchange between the outside air and the heat transfer fins 2, the heat transfer fins 2 are provided with the cuts 5 so that the heat exchange efficiency is improved.

  The refrigerant that has become a gas phase in the heat exchanger 1 returns to the compressor 22 via the four-way valve 23.

  Thereafter, this refrigerant flow is repeated to heat the room.

  When the outside air temperature is lowered in the state where the heating operation is continued, the wake-up occurs and the frost forms on the 6.

  However, since there is no edge or opening on the windward side where frosting is likely to occur in the cut and raised 6, only a thin frost is deposited on the surface of the cut and raised 6, and a ventilation path is always secured even during frosting. In addition, it is possible to prevent a decrease in heating performance due to clogging of heat transfer fins as in the past.

The reason why the accumulated frost on the surface of the cut-and-raised 6 is thin as shown in FIG. 5 is that the portion where the heat transfer amount of the heat transfer fins 2 and the outside air is large is the range indicated by the dotted-line ellipse. By installing the opening 7 of the raising 6, that is, the leeward side edge 6 b of the cut and raised 6 in the center of the heat transfer fin 2, the leeward side edge 6 b having the best heat transfer conventionally generating the most frost formation, Even if the opening 7 is frosted at the center of the heat transfer fin 2, that is, the position closest to the heat transfer tube 4, the heat from the heat transfer tube 4 through which the high-temperature refrigerant flows is transferred during the defrosting operation. It is easy and can be defrosted in a short time.

  In addition, in FIG. 5, the part shown black with a dot shows the state after defrosting of frost formation.

  Further, since the cut and raised 6 is formed so that the protruding height from the fin surface 2a increases from the windward side edge toward the leeward side edge 6b, one surface of the heat transfer fin 2 (in FIG. 5) Even if frost is accumulated on the upper surface, an air passage is secured between the other surface (lower surface in FIG. 5) and the fin surface, and even if frost is accumulated, the flow of outside air (air) is not hindered.

  Furthermore, as shown in FIG. 6, the legs 6c, 8c, 9c of the cut and raised portions 6 and 8 and 9 are arcuate in the direction along the heat transfer tube 4, and the center of the arc is the heat transfer tube. Since it is eccentric to the outer side of the circle 4, the total edge length of the cut and raised 6 and cut and raised 8 and 9 can be increased, and the heat transfer rate is improved by the temperature boundary layer renewal effect. Further, the arc-shaped legs 6c, 8c, 9c are in a direction along the heat transfer tube 4, and air effectively flows for heat transfer along the heat transfer tube 4, and in particular, separation of the air flow on the downstream side of the heat transfer tube 4. Can be suppressed.

  According to the heat exchanger of this embodiment, even if frost is formed on the leeward edge of the upwind side, the heat from the heat transfer tube through which the high-temperature fluid flows is easily transferred during the defrosting operation, and is removed in a short time. A heat exchanger suitable for an air conditioner can be realized, which can be frosted and has no heat-clogging clogging to improve heating performance.

  Further, according to the refrigeration cycle apparatus of the present embodiment, even if frost is formed on the leeward edge of the upwind cut and raised, heat from the heat transfer tube through which the high-temperature fluid flows is easily transmitted during the defrosting operation for a short time. Thus, a refrigeration cycle apparatus suitable for an air conditioner is realized, which can be defrosted and can improve heating performance without clogging of heat transfer fins.

  In addition, in the said embodiment, although demonstrated in the example which uses this heat exchanger for a heat source side heat exchanger, you may utilize for a utilization side heat exchanger and the example which utilizes a refrigeration cycle apparatus for an air conditioner. However, the present invention is not limited to this.

  DESCRIPTION OF SYMBOLS 1 ... Heat exchanger, 2 ... Heat transfer fin, 2a ... Fin surface, 3 ... Fin hole, 3a ... Fin collar, 4 ... Heat transfer tube, 5, 6 ... Cut up, 6b ... Downward side edge, 6c ... Leg Part 7: Opening part 7, 9 Cut up and raised, 8a, 9a ... Windward edge, 8b, 9b ... Windward edge, 8c, 9c ... Leg part, 10 ... Front reinforcement bead, 11 ... Rear reinforcement A bead, 21 ... refrigeration cycle apparatus, 22 ... compressor, 23 ... four-way valve, 24 ... expansion device, 25 ... indoor heat exchanger, 31 ... outdoor unit, 32 ... indoor unit.

Claims (3)

A plurality of heat transfer fins arranged side by side with predetermined gaps, circulating heat exchange air along these gaps, and provided with cuts;
A heat exchanger comprising a heat transfer tube which is adjacent to the heat transfer fin in a direction perpendicular to the flow direction of the heat exchange air of the heat transfer fin, and which is adjacent to and penetrates the heat transfer fin. In
The cut and raised are provided in a plurality of rows in the flow direction of the heat exchange air,
In the upwinding of the upwind side of the uplift, the upwind edge is located on the upwind side of the heat transfer tube, and the protrusion height from the fin surface increases from the upwind edge to the downwind edge. only leeward side edge while being formed so that it is cut an opening, and the leeward-side edge is positioned on a line connecting the centers of the heat transfer tube is highest Extruded Rutotomoni provided adjacent the fin surface,
2. A heat exchanger according to claim 1, wherein a plurality of cuts on the leeward side of the cut are provided in a slit shape in which both end edges on the windward side and the leeward side are cut. The windward cut and raised leg portions are arc-shaped in a direction along the heat transfer tube, and the center of the arc is eccentric to the outside of the center of the heat transfer tube. The heat exchanger according to claim 1, wherein: In a refrigeration cycle apparatus equipped with a compressor, a heat source side heat exchanger, an expansion device, and a use side heat exchanger,
3. The refrigeration cycle apparatus according to claim 1 , wherein at least one of the heat source side heat exchanger and the use side heat exchanger is the heat exchanger according to claim 1 .

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