JP6486718B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a fin-and-tube heat exchanger.

  Fin-and-tube heat exchangers are often used in air conditioners and refrigerators. First, an outline of the fin-and-tube heat exchanger will be described with reference to FIGS.

  A heat exchanger 40 that is a fin-and-tube heat exchanger includes a large number of fins 41 and one meandering tube 42. Each of the fins 41 has a strip shape whose longitudinal direction is the vertical direction, and a large number of the fins 41 are parallel to each other and are arranged along a horizontal straight line with a predetermined gap therebetween. The group of fins 41 penetrates so that the tubes 42 meander and sew. The inside of the tube 42 serves as a refrigerant passage through which the refrigerant flows.

  Both the fin 41 and the tube 42 are made of a metal having good heat conductivity such as aluminum, and are fixed to each other by a technique such as brazing, welding, or tube expansion. Generally, the fins 41 are made of aluminum and the tubes 42 are made of copper. However, the entire structure including the tubes 42 may be made of aluminum.

  Both ends of the tube 42 serve as refrigerant inlets and outlets 43 and 44, to which refrigerant pipes of devices (for example, air conditioners) are connected. The refrigerant may enter from the refrigerant inlet / outlet 43 as indicated by a solid line arrow and exit from the refrigerant inlet / outlet 44, or may enter from the refrigerant inlet / outlet 44 and exit from the refrigerant inlet / outlet 43 as indicated by a broken line arrow. When the heat exchanger 40 is used as a condenser, the flow direction enters from the refrigerant inlet / outlet 43 and exits from the refrigerant inlet / outlet 44. When the heat exchanger 40 is used as an evaporator, the flow direction enters from the refrigerant inlet / outlet 44 and exits from the refrigerant inlet / outlet 43. And often.

  Each of the planar shapes of fins 41 shown in FIGS. 7 and 8 (in terms of wood, the shape seen from the direction of the mouth) is linear. In order to increase the heat exchange area, the planar shape of the fin 41 is often set to a shape other than a straight line. A common practice is to make the fins 41 corrugated as shown in FIG. That is, the flat portions 41a are formed in a zigzag-like continuous shape via the bent portions 41b. In FIG. 9, four flat portions 41a and three bent portions 41b are provided in one fin 41, but this is merely an example and does not limit the invention.

  In the heat exchanger 40 shown in FIGS. 7 and 8, the tube 42 meanders in a single vertical plane, and is straight when viewed from above. The shape seen from above can be variously changed according to the purpose. Patent Document 1 describes that a fin-and-tube heat exchanger has a substantially L shape, a U shape, a U shape, or other shapes.

JP 2008-261611 A

  When the air flow is passed to exchange heat with the heat exchanger 40 having the corrugated fins 41 as shown in FIG. 9, the blowing direction of the air flow is the angle of the flat portion 41a at the leeward end. It depends. In FIG. 9, the flat portion 41a at the end on the leeward side forms an angle with respect to the axis of the tube 42 so as to descend to the right in the drawing, and an air flow is blown out along the angle.

  When combining the heat exchanger 40 with a blower, the heat exchanger 40 is usually disposed on the upwind side of the blower in the blowing direction. If the heat exchanger 1 has a shape other than a straight line as taught in Patent Document 1, a problem may occur depending on the shape of the heat exchanger 40 and the shape of the fins 41. The problem will be described with reference to FIG.

  FIG. 10 is a plan view schematically showing some of the components arranged inside the casing of the outdoor unit of the air conditioner. The housing is not shown. 45 is a blower which rotates the propeller fan 45a with the motor 45b, The heat exchanger 40 is arrange | positioned in the ventilation direction windward side. The heat exchanger 40 includes corrugated fins 41.

  The heat exchanger 40 has a U-shaped planar shape. That is, the heat exchanger 40 has a main part 40M that exists on the windward side of the blower 45 and both wings that bend from the end of the main part 40M to the outside of the side surface of the blower 45. One wing portion of both wing portions is a left wing portion 40L that bends from the left end of the main portion 40M to the outside of the left side surface of the blower 45, and the other wing portion extends from the right end of the main portion 40M to the outside of the right side surface of the blower 45. The right wing portion 40R is bent.

  The main part 40M of the heat exchanger 40 faces the rear intake port formed on the back surface of the casing of the outdoor unit of the air conditioner, and the left wing part 40L faces the left side intake port formed on the left side surface of the casing. The right wing portion 40R faces the right side intake port formed on the right side surface of the casing. The blower 45 faces an exhaust port formed on the front surface of the housing. The rear intake port, left side intake port, right side intake port, and exhaust port are not shown.

  The blower 45 is disposed not at a position aligned with the center of the heat exchanger 40 but at a position on the left side of the center, and a large gap is generated between the blower 45 and the right wing portion 40R. A partition wall 11P inside the casing of the outdoor unit is disposed in the gap. The front of the partition wall 11P is a machine room, and a compressor that circulates the refrigerant in the refrigeration cycle of the air conditioner, a control board that controls the outdoor unit, and the like are disposed here.

  As a result of the heat exchanger 40 having a U-shaped planar shape, the following situation occurs in the left wing 40L and the right wing 40R. That is, in the left wing portion 40L, the angle of the flat portion 41a at the leeward end of the fin 41 is an angle that directs the airflow toward the suction side of the blower 45. This is convenient for increasing the flow rate of the air flow. On the other hand, in the right wing part 40R, the direction of the fin 41 is reversed from the side of the left wing part 40L. As a result, the angle of the flat part 41a at the leeward end of the fin 41 is not on the suction side of the blower 45 but on the blowout side. It is an angle to face. In order to cause the air flow to be sucked into the blower 45, it is necessary to change the direction of the air flow, and energy is lost and the flow is also delayed. These are negative factors in terms of airflow rate. In addition, in the configuration of FIG. 10, the partition wall 11 </ b> P exists on the hand of the air flow blown out from the fins 41 of the right wing portion 40 </ b> R, thereby preventing the flow. As a result, in the left wing portion 40L, air circulation is smooth and heat exchange is performed efficiently, but in the right wing portion 40R, air circulation is hindered and heat exchange efficiency is reduced.

  Looking at the air flow blown from the main portion 40M of the heat exchanger 40, it can be said that the air flow blown from the fin 41 located on the left side of the right end of the blower 45 is directed toward the suction side of the blower 45. The air flow blown out from the fins 41 located on the right side of the right end of the blower 45 is directed in a direction deviating from the suction side of the blower 45. In order for the air flow toward the direction deviating from the suction side of the blower 45 to be sucked into the blower 45, it is necessary to change the direction, and energy is lost, and the flow is stagnant. Become.

  The present invention has been made in view of the above points, and is a fin-and-tube type heat having a main part existing on the windward side of the blower in the blower direction and both wings bent from the end of the main part to the outside of the side face of the blower. The purpose of the exchanger is to improve the ventilation performance in any blade and to obtain high heat exchange efficiency.

  The heat exchanger according to the present invention is a fin-and-tube heat exchanger disposed on the upwind direction of the blower, and the heat exchanger includes a main portion existing on the upwind direction of the blower. , Having both wings bent from the end of the main part to the outside of the side surface of the blower, and a plurality of fins are attached to one wing and the other wing of each of the wings, The corrugated shape in which the flat portions are zigzag-shaped through the bent portions, and the fin is the flat portion at the leeward end in any of the wing portions, the air flow is It is characterized by the angle being directed toward the suction side of the blower.

  In the heat exchanger having the above-described configuration, the fins having the same corrugated shape as the fins attached to the one wing part are attached in an inverted state to the other wing part, so that the fins can be used in both the wing parts. It is preferable to obtain a state where the flat portion at the end on the leeward side is at an angle that directs the air flow toward the suction side of the blower.

  In the heat exchanger configured as described above, a plurality of the corrugated fins are also arranged in the main portion, and the flat portion at the leeward end of the fin is also at an angle that directs the air flow toward the suction side of the blower. It is preferable.

  According to the present invention, the corrugated fins attached to both wing parts of the U-shaped heat exchanger have a flat part at the leeward end of each wing part so that the air flow is directed to the suction side of the blower. Since the angle is directed to the airflow, the airflow blown out from the fin is sucked into the blower without any stagnation. As a result, air flows smoothly through any wing, and ventilation performance is improved. Thereby, high heat exchange efficiency can be obtained.

It is a schematic block diagram of the air conditioner carrying the heat exchanger which concerns on this invention, and shows the state at the time of air_conditionaing | cooling operation. It is a schematic block diagram of the air conditioner carrying the heat exchanger which concerns on this invention, and shows the state at the time of heating operation. It is a horizontal sectional view showing a schematic structure of an outdoor unit of an air conditioner. It is a top view which shows schematic structure of what combined the air blower with the heat exchanger which concerns on 1st Embodiment of this invention. It is a top view which shows schematic structure of what combined the air blower with the heat exchanger which concerns on 2nd Embodiment of this invention. It is a top view which shows schematic structure of what combined the air blower with the heat exchanger which concerns on 3rd Embodiment of this invention. It is a front view explaining the structure of a fin and tube type heat exchanger. It is a top view explaining the structure of a fin and tube type heat exchanger. It is a fragmentary top view of what made the fin of the fin and tube type heat exchanger corrugate shape. It is a top view which shows schematic structure of what combined the air blower with the fin and tube type heat exchanger which made the fin the corrugated shape.

<First Embodiment>
A heat exchanger 40 according to a first embodiment of the present invention will be described with reference to FIGS. The heat exchanger 40 is mounted on the outdoor unit 10 of the separate air conditioner 1 configured by an outdoor unit and an indoor unit.

  The outdoor unit 10 houses a compressor 12, a switching valve 13, a heat exchanger 40, an expansion valve 15, a blower 45, and the like in a housing 11 made of steel plate parts and synthetic resin parts. The switching valve 13 is a four-way valve. As the expansion valve 15, a valve whose opening degree can be controlled is used.

  The outdoor unit 10 is connected to the indoor unit 30 through two refrigerant pipes 17 and 18. The refrigerant pipe 17 is a pipe through which liquid refrigerant flows during the cooling operation, and a pipe that is thinner than the refrigerant pipe 18 is used. Therefore, the refrigerant pipe 17 may be referred to as “liquid pipe”, “narrow pipe”, or the like. The refrigerant pipe 18 is a pipe through which a gaseous refrigerant flows during the cooling operation, and is thicker than the refrigerant pipe 17. Therefore, the refrigerant pipe 18 may be referred to as “gas pipe”, “thick pipe”, or the like. For example, HFC R410A or R32 is used as the refrigerant.

  In the refrigerant pipe inside the outdoor unit 10, a two-way valve 19 is provided in the refrigerant pipe connected to the refrigerant pipe 17, and a three-way valve 20 is provided in the refrigerant pipe connected to the refrigerant pipe 18. The two-way valve 19 and the three-way valve 20 are closed when the refrigerant pipes 17 and 18 are removed from the outdoor unit 10 to prevent the refrigerant from leaking from the outdoor unit 10 to the outside. When it is necessary to recover the refrigerant from the outdoor unit 10 or the entire refrigeration cycle including the indoor unit 30, the recovery is performed through the three-way valve 20.

  FIG. 3 shows the structure of the outdoor unit 10 more substantively. The casing 11 of the outdoor unit 10 is made of a steel plate, and is drawn in a substantially rectangular shape in FIG. The casing 11 has a long side as a front surface 11F and a back surface 11B, and a short side as a left side surface 11L and a right side surface 11R. An exhaust port (not shown) is formed on the front face 11F at a location facing the blower 45, a back intake port (not shown) is formed on the back face 11B at a location facing the main portion 40M of the heat exchanger 40, and a left side face 11L. A left side air inlet (not shown) is formed at a location facing the left wing 40L of the heat exchanger 40, and a right side air inlet (not shown) is formed at a location facing the right wing 40R of the heat exchanger 40 on the right side 11R. The A top plate and a bottom plate (not shown) are added to the four sheet metal members of the front surface 11F, the back surface 11B, the left side surface 11L, and the right side surface 11R to form a hexahedral-shaped casing 11.

  There is no limitation that one part constitutes each of the six surfaces of the housing 11. There may be a surface composed of one part and a surface composed of a plurality of parts.

  Inside the housing 11, a planar U-shaped heat exchanger 40 is disposed along the inner surfaces of the back surface 11B, the left side surface 11L, and the right side surface 11R. A blower 45 is disposed in the space between the left wing 40L and the right wing 40R of the heat exchanger 40 in order to force heat exchange between the heat exchanger 40 and the outdoor air. A partition wall 11P exists between the blower 45 and the right side surface 11R, and a space on the front side thereof is a machine room that houses the compressor 12 and the like.

  The indoor unit 30 houses a heat exchanger 32, a blower 33, and the like inside a casing 31 that is made of synthetic resin parts. The heat exchanger 32 is a combination of three heat exchangers 32 </ b> A, 32 </ b> B, and 32 </ b> C like a roof that covers the indoor blower 33. Any or all of the heat exchangers 32 </ b> A, 32 </ b> B, and 32 </ b> C can be configured by a fin-and-tube heat exchanger similar to the heat exchanger 40. The blower 33 is a combination of a cross flow fan and a motor.

  FIG. 1 shows a state in which the air conditioner 1 is performing a cooling operation or a defrosting operation. At this time, the compressor 12 circulates the refrigerant in a cooling mode, that is, in a circulation mode in which the refrigerant discharged from the compressor 12 first enters the heat exchanger 40.

  The high-temperature and high-pressure refrigerant discharged from the compressor 12 enters the heat exchanger 40 where heat exchange with outdoor air is performed. The refrigerant dissipates heat to the outdoor air and condenses. The refrigerant which is condensed to become liquid enters the expansion valve 15 from the heat exchanger 40 and is decompressed there. The decompressed refrigerant is sent to the heat exchanger 32 and expands to a low temperature and a low pressure, and the surface temperature of the heat exchanger 32 is lowered. The heat exchanger 32 whose surface temperature has dropped absorbs heat from the room air, and thereby the room air is cooled. After the heat absorption, the low-temperature gaseous refrigerant returns to the compressor 12. The air flow generated by the blower 45 promotes heat dissipation from the heat exchanger 40, and the air flow generated by the blower 33 promotes heat absorption of the heat exchanger 32.

  FIG. 2 shows a state where the air conditioner 1 is performing a heating operation. At this time, the switching valve 13 is switched to reverse the refrigerant flow during the cooling operation. The compressor 12 circulates the refrigerant in a circulation mode during heating, that is, in a circulation mode in which the refrigerant discharged from the compressor 12 first enters the heat exchanger 32.

  The high-temperature and high-pressure refrigerant discharged from the compressor 12 enters the heat exchanger 32 where heat exchange with room air is performed. The refrigerant dissipates heat to the room air, and the room air is warmed. The refrigerant that has dissipated heat and is condensed to become liquid enters the expansion valve 15 from the heat exchanger 32 and is decompressed there. The decompressed refrigerant is sent to the heat exchanger 40, expands to low temperature and low pressure, and lowers the surface temperature of the heat exchanger 40. The heat exchanger 40 whose surface temperature has dropped absorbs heat from the outdoor air. After the heat absorption, the low-temperature gaseous refrigerant returns to the compressor 12. The air flow generated by the blower 33 promotes heat dissipation from the heat exchanger 32, and the air flow generated by the blower 45 promotes heat absorption by the heat exchanger 40.

  In the heat exchanger 40 according to the first embodiment, the fins 41 are devised as follows. That is, as shown in FIG. 4, in both the left wing portion 40L and the right wing portion 40R, the plane portion 41a located at the end on the leeward side out of the plurality of plane portions 41a included in the fin 41 sucks the air flow into the blower 45. The angle is set toward the side. As a result, air flows smoothly in the left wing portion 40L and the right wing portion 40R, and ventilation performance is improved. Thereby, high heat exchange efficiency can be obtained.

  The angle state of the flat surface portion 41a as described above can be obtained by attaching the corrugated fin 41, which is the same as the fin 41 attached to the left wing portion 40L, in an inverted state in the right wing portion 40R. FIG. 4 shows exactly this state.

  As described above, if the corrugated fins 41 that are the same as the fins 41 attached to the left wing portion 40L are attached in an inverted state in the right wing portion 40R, the types of components do not increase, and the component manufacturing cost and component management Cost can be reduced.

  In FIG. 4, the position aligned with the center line of the blower 45 in the main part 40 </ b> M is the reverse position of the fin 41. The position is indicated by a broken line and is defined as a fin direction change position T. That is, even if the fin 41 in the same direction as the fin 41 of the left wing portion 40L enters the main portion 40M from the left wing portion 40L, it continues in that direction until the fin direction change position T. Even if the fin 41 in the same direction as the fin 41 of the right wing portion 40R enters the main portion 40M from the right wing portion 40R, it continues in that direction until the fin direction change position T.

  By configuring the fin 41 of the main portion 40M as described above, the angle of the flat portion 41a at the end of the leeward side of the fin 41 of the main portion 40M is such that the air flow is directed toward the suction side of the blower 45. Become. As a result, even in the main portion 40M, air flows smoothly and the ventilation performance is improved. Thereby, high heat exchange efficiency can be obtained.

Second Embodiment
The structure of the heat exchanger 40 which concerns on 2nd Embodiment of this invention is demonstrated based on FIG. The heat exchanger 40 according to the second embodiment is different from the first embodiment in the shape of the fins 41 of the main portion 40M. That is, all the fins 41 of the main portion 40M have an angle at which the flat surface portion 41a at the leeward side is orthogonal to the axis of the tube. There are fin direction change positions T between the left wing portion 40L and the main portion 40M and between the right wing portion 40R and the main portion 40M.

  The fins 41 in the main portion 40M are symmetrical on the left and right sides of the center of the main portion 40M, but this is not an essential configuration. The whole main part 40M may be unified with the shape of the fin 41 on the left side from the center of the main part 40M, or the whole main part 40M may be unified with the shape of the fin 41 on the right side from the center of the main part 40M.

  By making the angle of the flat surface portion 41a at the leeward side end of the fin 41 of the main portion 40M as described above, the air flow coming out of the main portion 40M is generally directed to the suction side of the blower 45, and the main portion 40M is Air flows smoothly and ventilation performance is improved. Thereby, high heat exchange efficiency can be obtained.

<Third Embodiment>
The structure of the heat exchanger 40 according to the third embodiment of the present invention will be described with reference to FIG. In the third embodiment, among the fins 41 of the main part 40 </ b> M, the flat part 41 a at the leeward side of the fins 41 behind the blower 45 has an angle perpendicular to the axis of the tube 42. The fin 41 that protrudes to the right side of the blower 45 has a shape in which the fin 41 in the right wing portion 40R continues so far. There is a fin direction change position T between the left wing portion 40L and the main portion 40M and at a position aligned with the right end of the blower 45 in the main portion 40M.

  With the above configuration, the fin 41 protruding to the right side of the blower 45 in the main portion 40M has an angle at which the flat portion 41a at the end on the leeward side directs the air flow from there to the suction side of the blower 45. As a result, even in the main portion 40M, air flows smoothly and the ventilation performance is improved. Thereby, high heat exchange efficiency can be obtained.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

  The present invention is widely applicable to fin-and-tube heat exchangers.

DESCRIPTION OF SYMBOLS 1 Air conditioner 10 Outdoor unit 11 Case 11P Partition wall 40 Heat exchanger 40M Main part 40L Left wing part 40R Right wing part 41 Fin 41a Plane part 41b Bending part 42 Tube

Claims (3)

A fin-and-tube heat exchanger disposed on the windward side of the blower,
The heat exchanger has a main part that exists on the windward side of the blower in the blowing direction, and both wing parts that are bent from the end of the main part to the outside of the side surface of the blower.
A plurality of fins are attached to one wing and the other wing of each of the wings,
The fin has a corrugated shape in which the flat portions are zigzag-shaped through the bent portions,
The fin is characterized in that, in any of the wing parts of the both wing parts, the flat part at the end on the leeward side is at an angle that directs the air flow toward the suction side and the main part side of the blower. Heat exchanger.   The same corrugated fin as the fin attached to the one wing is attached in an inverted state on the other wing so that the plane at the leeward end of the fin in either of the wings. The heat exchanger according to claim 1, wherein a state is obtained in which the portion has an angle that directs the air flow toward the suction side of the blower.   A plurality of the corrugated fins are also arranged in the main portion, and the flat portion at the leeward end of the fin is also at an angle that directs the air flow toward the suction side of the blower. Item 3. The heat exchanger according to Item 1 or 2.

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