JP2017048942A - Evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator capable of easily removing attached dust by efficiently washing the entire fins.SOLUTION: An evaporator 1 includes a heat exchange core part 4 having a plurality of heat exchange pipes 5A, 5B and fins 6 arranged between the adjacent heat exchange pipes 5A, 5B. Out of all the heat exchange pipes 5A, 5B, at least one part of heat exchange pipes 5B has a windward surface 22 which faces the further windward side than the heat exchange core part 4. Vertically extending washing liquid jetting pipes 7 are arranged at one part of all the heat exchange pipes 5B having the windward surface 22, and along the windward surfaces 22 of the plurality of heat exchange pipes 5B. A plurality of nozzle holes 23 for jetting a washing liquid toward the fins 6 are formed at the washing liquid jetting pipes 7. All the washing liquid jetting pipes 7 are connected to washing liquid supply pipes extending in the longitudinal direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an evaporator suitably used for a vehicle air conditioner that is a refrigeration cycle mounted on an automobile, for example.

  In this specification and claims, the top and bottom of FIGS. 1 and 2 are the top and bottom, and the flow direction of the air flowing through the ventilation gap between adjacent heat exchange pipes (indicated by an arrow X in FIGS. 1 and 2). The left and right (left and right in FIG. 1) when the leeward side is viewed from the windward side in the direction shown) are referred to as left and right.

  As a vehicle air conditioner, a casing having an air inlet, an air outlet, and an air passage through the air inlet and the air outlet, an evaporator arranged in the air passage of the casing and constituting a refrigeration cycle, and the casing And an air blower that blows air into the passenger compartment, and the evaporator is arranged at intervals in the vertical direction with the width direction in the ventilation direction and the longitudinal direction in the same direction. A pair of upper and lower header tanks and a heat exchange core provided between the upper and lower header tanks, and two headers with the longitudinal direction facing the longitudinal direction of both header tanks. Are arranged side by side in the ventilation direction, a refrigerant inlet is provided at one end of the leeward header portion of the upper header tank, and the windward head of the upper header tank is provided. A refrigerant outlet is provided at the same end as the refrigerant inlet in the section, and the heat exchange core section is spaced in the longitudinal direction of both header sections between the two header sections of the upper and lower header tanks with the width direction directed in the ventilation direction. A plurality of flat heat exchange tubes arranged in the air and fins arranged so as to straddle the heat exchange tubes arranged in the ventilation direction between adjacent heat exchange tubes. That is, an evaporator is widely known in which at least a part of the total heat exchange pipe has a windward surface facing the windward side of the heat exchange core portion.

  By the way, if the above-described vehicle air conditioner is used for a long period of time, dust adheres to the windward portion of the evaporator fins. There is a risk that cooling performance will be reduced due to increase in ventilation resistance.

  In order to solve such problems, conventionally, the evaporator has been removed from the casing of the vehicle air conditioner and cleaned, or the entire evaporator has been replaced with a new one. However, in this case, there is a problem that the cost becomes high.

  Therefore, as a vehicle air conditioner for the purpose of easily removing dust adhered by washing the fins of the evaporator, it extends in the width direction of the evaporator in the air flow direction upstream of the evaporator in the air passage of the casing. A cleaning nozzle having a blowout port for spraying the cleaning liquid onto the evaporator is disposed at a distance from the evaporator, and the cleaning liquid is supplied to the cleaning nozzle from a cleaning liquid storage tank disposed outside the casing. A vehicle air conditioner has been proposed (see Patent Document 1).

  However, in the vehicle air conditioner described in Patent Document 1, the cleaning nozzle that sprays the cleaning liquid on the evaporator is arranged at an interval from the evaporator on the upstream side in the air flow direction of the evaporator in the air passage of the casing. It is difficult to spray the cleaning liquid over the entire fin, and the entire fin cannot be cleaned efficiently.

Japanese Patent Laid-Open No. 2001-260643

  An object of the present invention is to provide an evaporator that solves the above-described problems and can easily remove dust adhering to the fins by efficiently washing the fins.

  In order to achieve the above object, the present invention comprises the following aspects.

1) It has an upper header tank arranged with the width direction in the ventilation direction and the longitudinal direction in the left-right direction, and a heat exchange core portion provided below the upper header tank. Between the adjacent heat exchange pipes and a plurality of heat exchange pipes arranged at intervals in the left-right direction with the longitudinal direction facing the vertical direction and having the upper end connected to the upper header tank In the evaporator, the fins are provided, and at least some of the heat exchange tubes have a wind surface facing the windward side of the heat exchange core portion.
A cleaning liquid jet pipe extending in the vertical direction is arranged along a part of the total heat exchange pipe having the wind face and along the wind face of the plurality of heat exchange pipes. The evaporator is configured to supply a cleaning liquid from a cleaning liquid supply pipe extending in the left-right direction to all the cleaning liquid jet pipes.

  2) The heat exchange pipe has a flat shape in which the width direction is directed in the ventilation direction and the thickness direction is directed in the left-right direction, and the cleaning liquid ejection pipe is disposed along the wind surface with the outer diameter of the cleaning liquid ejection pipe The evaporator according to the above 1), wherein the evaporator is equal to or less than the pipe height which is a dimension in the thickness direction of the heat exchange pipe.

  3) The fins on both sides of the heat exchange pipe in which the cleaning liquid ejection pipe is disposed along the wind surface have protrusions that protrude to the windward side of the wind surface of the heat exchange pipe, and the cleaning liquid ejection pipe The evaporator according to 2) above, wherein is disposed between the projecting portions of the fins.

  4) The above-mentioned 1) to 3), wherein the number of the heat exchange pipes that are present between the cleaning liquid jet pipes adjacent in the left-right direction and in which the cleaning liquid jet pipes are not arranged along the wind surface is at least one. The evaporator as described in any one of them.

  5) The evaporator according to any one of 1) to 4) above, wherein the cleaning liquid ejection pipe is brazed to the heat exchange pipe.

  According to the evaporators 1) to 5) above, the cleaning liquid jet pipe extending in the vertical direction is arranged along a part of the total heat exchange pipe having the wind surface and along the wind surface of the plurality of heat exchange pipes. A plurality of nozzle holes for ejecting the cleaning liquid toward the fins are formed in the cleaning liquid ejection pipe, and the cleaning liquid is supplied to the entire cleaning liquid ejection pipe from the cleaning liquid supply pipe extending in the left-right direction. The distance between the nozzle hole of the tube and the fin is closer than the distance between the cleaning nozzle and the evaporator fin in the vehicle air conditioner described in Patent Document 1, and the entire fin is efficiently cleaned to easily remove the attached dust. It becomes possible to do.

  Moreover, if the evaporator is disposed in the air passage of the casing of the vehicle air conditioner, one end of the cleaning liquid supply pipe is closed, and a portion near the other end is projected outside the casing, the entire fin is cleaned. It is not necessary to remove the evaporator from the casing, and the cost is reduced.

  According to the evaporator of 2), a part of the cleaning liquid ejection pipe does not protrude into the ventilation gap between adjacent heat exchange pipes, and an increase in ventilation resistance is prevented.

  According to the evaporator of the above 4), the number of cleaning liquid ejection pipes can be minimized, so that an increase in ventilation resistance is prevented.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator according to the present invention. It is the AA line expanded sectional view of Drawing 1 which omitted some. It is the BB sectional drawing of FIG. 2 which abbreviate | omitted one part. FIG. 4 is a partially enlarged view of FIG. 3. It is a horizontal sectional view which shows roughly the vehicle air conditioner using the evaporator of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  FIG. 1 shows the overall configuration of an evaporator according to the present invention, and FIGS. 2 to 4 show the configuration of the main part thereof. FIG. 5 schematically shows a vehicle air conditioner using the evaporator shown in FIG.

  1 and 2, the evaporator (1) is an aluminum upper header tank (2) arranged in the vertical direction with the longitudinal direction oriented in the horizontal direction and the longitudinal direction in the horizontal direction. And a lower header tank (3) made of aluminum and a heat having a plurality of aluminum heat exchange tubes (5A) (5B) and aluminum corrugated fins (6) provided between the upper and lower header tanks (2) (3). The cleaning liquid is supplied to the replacement core section (4), a plurality of aluminum cleaning liquid ejection pipes (7) extending in the vertical direction and spaced apart from each other in the horizontal direction, and the entire cleaning liquid ejection pipe (7) extending in the horizontal direction. An aluminum cleaning liquid supply pipe (8) is provided.

  The upper header tank (2) is located on the leeward side and the leeward header portion (9) with the longitudinal direction facing the left and right direction, and the leeward header portion (9) located on the windward side and with the longitudinal direction facing the left and right direction ( 11) and a connecting part (12) for connecting and integrating the header parts (9) and (11) to each other. The lower header tank (3) is located on the leeward side and the leeward header part (13) with the longitudinal direction facing the left and right direction, and the leeward header part (13) located on the windward side and with the longitudinal direction facing the left and right direction ( 14) and a connecting portion (15) for connecting and integrating the header portions (13) and (14) to each other. In the following description, the leeward header portion (9) of the upper header tank (2) is the leeward upper header portion, the leeward header portion (13) of the lower header tank (3) is the leeward lower header portion, and the upper header tank. The windward header portion (11) of (2) is called the windward upper header portion, and the windward header portion (14) of the lower header tank (3) is called the windward lower header portion. A refrigerant inlet (16) is provided at the left end of the leeward upper header portion (9), and a refrigerant outlet (17) is provided at the left end of the leeward upper header portion (11).

  In the evaporator (1) of this embodiment, the refrigerant that has flowed into the leeward upper header portion (9) from the refrigerant inlet (16) flows through all the heat exchange tubes (5A) (5B) to reach the leeward upper header. It flows out from the refrigerant outlet (17) at the right end of the section (11).

  As shown in FIGS. 2 to 4, the heat exchange pipes (5A) and (5B) have both the upper and lower header sections (9) on the leeward side in a state where the longitudinal direction is directed in the vertical direction and the width direction is directed in the ventilation direction. (13) Between the upper and lower header sections (11) and (14) on the leeward side, a plurality of spaces are arranged in the left-right direction, and the upper and lower header sections on the leeward side ( 9) From the leeward side tube row (18) consisting of a plurality of heat exchange tubes (5A) between (13) and the plurality of heat exchange tubes (5B) between the upper and lower header parts (11) (14) on the windward side And an upwind tube row (19). The upper and lower ends of the heat exchange pipe (5A) of the leeward side pipe row (18) are connected to the upper and lower header parts (9) (13) on the leeward side, and the heat exchange pipe (5B) of the windward side pipe row (19) Both the upper and lower end portions of the are connected to the upper and lower header portions (11) and (14) on the windward side. In the corrugated fin (6), a plurality of louvers (10) whose longitudinal direction is directed in the left-right direction are provided at intervals in the ventilation direction, and the heat exchange tubes (5A) (5B) adjacent in the left-right direction are connected to each other. Between the heat exchanger tubes (5A) and (5B) at the left and right ends, and so as to straddle the heat exchanger tubes (5A) and (5B) of the leeward tube row (18) and the windward tube row (19) And brazed to the heat exchange tubes (5A) and (5B). Aluminum side plates (21) are arranged outside the corrugated fins (6) at the left and right ends and brazed to the corrugated fins (6). The corrugated fin (6) is shared by the heat exchange tubes (5A) and (5B) constituting the leeward side tube row (18) and the windward side tube row (19).

  At least a part of the total heat exchange pipe (5A) (5B) of the heat exchange core section (4) (5B), that is, the total heat exchange pipe (5B) constituting the windward side tube row (19) Has an upwind surface (22) facing the windward side of the heat exchange core (4). Further, the corrugated fin (6) has a protruding portion (6a) that protrudes further to the windward side than the windward surface (22) of the heat exchange tube (5B) constituting the windward tube row (19). The louver (10) is also provided on the protrusion (6a).

  The cleaning liquid jet pipe (7) has a circular cross section, and is part of the total heat exchange pipe (5B) of the windward side pipe row (19) and on the wind surface (22) of the plurality of heat exchange pipes (5B). Along the entire length of the heat exchange pipe (5B) and brazed to the wind surface (22) of the heat exchange pipe (5B). The number of the heat exchange pipes (5B) that exist between the cleaning liquid jet pipes (7) adjacent in the left-right direction and in which the cleaning liquid jet pipe (7) is not disposed along the wind surface (22) is at least one. One here. The outer diameter of the cleaning liquid jet pipe (7) is equal to or less than the pipe height which is the dimension in the thickness direction of the heat exchange pipes (5A) and (5B). The cleaning liquid jet pipe (7) is located between the protrusions (6a) of the corrugated fins (6) on both the left and right sides of the heat exchange pipe (5B) where the cleaning liquid jet pipe (7) is arranged on the wind surface (22). In addition, the protrusions (6a) of both corrugated fins (6) are brazed. The cleaning liquid jet pipe (7) has a plurality of nozzles for jetting the cleaning liquid toward the corrugated fins (6) on the left and right sides of the heat exchange pipe (5B) in which the cleaning liquid jet pipe (7) is arranged on the wind surface (22). Holes (23) are formed at intervals in the vertical direction.

  The cleaning liquid supply pipe (8) is located above the upper end of the corrugated fin (6), with a part located below the upper header tank (2) and the remaining part protruding above the upper header tank (2). The upper end of the entire cleaning liquid ejection pipe (7) is connected to the cleaning liquid supply pipe (8). The cleaning liquid supply pipe (8) is open at the left end and closed at the right end, and a fixed length portion on the left end side projects leftward from the upper header tank (2).

  The above-described evaporator (1) constitutes a refrigeration cycle together with a compressor, a condenser as a refrigerant cooler, and an expansion valve as a pressure reducer, and serves as a vehicle air conditioner (30) as shown in FIG. Installed.

  In FIG. 5, the vehicle air conditioner (30) has an air inlet (32), an air outlet (33), and an air passage (34) through which the air inlet (32) and the air outlet (33) are passed. A plastic casing (31) having an evaporator (1) disposed in an air passage (34) of the casing (31) and constituting a refrigeration cycle together with a compressor, a refrigerant cooler (condenser), a decompressor, etc. And a blower (35) for sending air into the air passage (34) of the casing (31) and blowing the air into the vehicle compartment.

  A constant length portion near the opening end of the cleaning liquid supply pipe (8) of the evaporator (1) is projected outside the casing (31).

  Although not shown in the drawings, as is well known, the air outlet (33) of the casing (31) is connected to the air outlet formed in the casing (31) so as to blow out air to each part in the passenger compartment. A blowout port for blowing out air can be switched by the blowout position switching device. Further, a heater core is also disposed in the air passage (34) of the casing (31), and the temperature blown out from the outlet is adjusted by an appropriate means.

  In the vehicle air conditioner (30) described above, the cleaning liquid is sent into the cleaning liquid ejection pipe (7) through the cleaning liquid supply pipe (8) periodically or when an unpleasant odor occurs in the passenger compartment of the automobile. The cleaning liquid sent into the cleaning liquid jet pipe (7) is blown out from the nozzle hole (23) to the entire corrugated fin (6), and the corrugated fin (6) is cleaned and adhered by the blown cleaning liquid. Is removed.

  In the embodiment described above, the cleaning liquid ejection pipe (7) and the cleaning liquid supply pipe (8) are made of aluminum, and the cleaning liquid ejection pipe (7) is brazed to the wind surface (22) of the heat exchange pipe (5B). However, the present invention is not limited to this, and the cleaning liquid ejection pipe and the cleaning liquid supply pipe are integrally formed of synthetic resin, and the cleaning liquid ejection pipe is bonded to the wind surface (22) of the heat exchange pipe (5B) with an adhesive. Or may be fixed to the heat exchange tube (5B) using an appropriate fixing tool such as a clip.

  The evaporator according to the present invention is suitably used for a vehicle air conditioner mounted on an automobile.

(1): Evaporator
(2): Upper header tank
(4): Heat exchange core
(5A) (5B): Heat exchange pipe
(6): Corrugated fin
(6a): Projection
(7): Cleaning liquid jet pipe
(8): Cleaning liquid supply pipe
(22): Wind surface
(23): Nozzle hole

Claims (5)

It has an upper header tank arranged with the width direction in the ventilation direction and the longitudinal direction in the left-right direction, and a heat exchange core portion provided below the upper header tank. The heat exchanger tubes are disposed between the adjacent heat exchanger tubes and the plurality of heat exchanger tubes arranged at intervals in the left-right direction with the longitudinal direction directed in the vertical direction and having the upper end connected to the upper header tank. In an evaporator provided with fins, wherein at least a part of the total heat exchange pipe has a wind surface facing the windward side than the heat exchange core part,
A cleaning liquid jet pipe extending in the vertical direction is arranged along a part of the total heat exchange pipe having the wind face and along the wind face of the plurality of heat exchange pipes. The evaporator is configured to supply a cleaning liquid from a cleaning liquid supply pipe extending in the left-right direction to all the cleaning liquid jet pipes. The heat exchange pipe has a flat shape in which the width direction is directed in the ventilation direction and the thickness direction is directed in the left-right direction, and the outer diameter of the cleaning liquid ejection pipe is disposed along the wind surface. The evaporator according to claim 1, wherein the evaporator is equal to or less than a pipe height which is a dimension in a thickness direction of the pipe. Fins on both sides of the heat exchange pipe in which the cleaning liquid ejection pipe is disposed along the wind surface have protrusions that protrude to the windward side of the wind surface of the heat exchange pipe, and the cleaning liquid ejection pipe is The evaporator of Claim 2 arrange | positioned between the protrusion parts of a fin. The number of heat exchange pipes that are present between the cleaning liquid jet pipes adjacent in the left-right direction and in which the cleaning liquid jet pipes are not disposed along the wind surface is at least one. The evaporator according to crab. The evaporator according to any one of claims 1 to 4, wherein the cleaning liquid ejection pipe is brazed to the heat exchange pipe.

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