JP2011122730A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger enabling installation of a connecting device for the heat exchanger nearby. <P>SOLUTION: An evaporator includes: a refrigerant inflow/outflow member 5 having laminated first plate 21 and second plate 22; and an expansion valve mounting member 6 having refrigerant passages 6a, 6b with both ends opened. An inflow passage 24 and an outflow passage 25 are formed between the both plates 21, 22 of the refrigerant inflow/outflow member 5 by swelling the both plates 21, 22 outwardly. Fitting projections 61, 62 fitted to the inside of the end openings of the inflow passage 24 and the outflow passage 25 of the refrigerant inflow/outflow member 5 are provided around the openings at one ends of the respective refrigerant flow passages 6a, 6b of the expansion valve mounting member 6. The end on the inlet 24a side on the inner peripheral face of the inflow passage 24 and the end on the outlet 25a side on the inner peripheral face of the outflow passage 25 are formed into tapered conical surfaces 53, 54 each having a diameter reducing toward the rear side edge of the refrigerant inflow/outflow member 5. The outer peripheral faces of the fitting projections 61, 62 of the expansion valve mounting member 6 are formed to be conical surfaces 63, 64 gradually wider toward the ends each having a diameter increasing toward the projecting end side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchanger suitably used as an evaporator of a car air conditioner that is a refrigeration cycle mounted on an automobile, for example.

  As an evaporator that can be reduced in size, weight, and performance, the applicant previously has a refrigerant inlet header portion and a refrigerant outlet header portion arranged side by side in the ventilation direction, and a refrigerant circulation path that passes through both header portions. A first intermediate header portion disposed opposite to the refrigerant inlet header portion and a second intermediate portion disposed opposite the refrigerant outlet header portion on the rear side of the first intermediate header portion. A plurality of heat exchange tubes disposed between the header portion, the refrigerant inlet header portion and the first intermediate header portion, and between the refrigerant outlet header portion and the second intermediate header portion, A refrigerant inlet is formed at one end of the header part, and a refrigerant outlet is formed at the same end as the refrigerant inlet in the refrigerant outlet header part. The refrigerant flowing from the refrigerant inlet into the refrigerant inlet header part passes through the refrigerant circulation path. The evaporator is configured to return to the refrigerant outlet header and be sent out from the refrigerant outlet, and a pipe joint plate having a short cylindrical refrigerant inflow portion leading to the refrigerant inlet and a short cylindrical refrigerant outflow portion leading to the refrigerant outlet, The refrigerant inlet header and the refrigerant outlet header are joined to each other, the end of the refrigerant inlet pipe is inserted and joined to the refrigerant inflow part, and the refrigerant outlet pipe having a larger diameter than the refrigerant inlet pipe is joined to the refrigerant outflow part. The evaporator which the diameter reduction part formed in the edge part was inserted and joined was proposed (refer patent document 1).

  Although not shown, in the evaporator described in Patent Document 1, the refrigerant inlet pipe and the refrigerant outlet pipe are bent to the upstream side in the ventilation direction, and the expansion valve as a heat exchanger connecting device straddling the distal ends of both pipes An attachment member is joined, and an expansion valve whose opening degree is adjusted is attached to the expansion valve attachment member based on the temperature and pressure of the refrigerant that has flowed out of the refrigerant outlet header portion and has flowed through the refrigerant outlet pipe. ing.

  However, in the evaporator described in Patent Document 1, there is a limit to reducing the bend radii of the refrigerant inlet pipe and the refrigerant outlet pipe for the convenience of bending, so the expansion valve mounting member should be installed near the evaporator. There is a problem that the position of the expansion valve is far from the evaporator.

JP 2005-164226 A

  The objective of this invention is providing the heat exchanger which can solve the said problem and can install the connection apparatus for heat exchangers near.

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

1) It is provided with a refrigerant inlet header portion and a refrigerant outlet header portion arranged side by side in the ventilation direction, and a refrigerant circulation path through both header portions, and a refrigerant inlet is formed at one end of the refrigerant inlet header portion, A refrigerant outlet is formed at the same end as the refrigerant inlet in the refrigerant outlet header, so that the refrigerant flowing into the refrigerant inlet header from the refrigerant inlet returns to the refrigerant outlet header through the refrigerant circulation path and is sent out from the refrigerant outlet. In the heat exchanger
A refrigerant inlet / outlet member having the first and second plates stacked and joined across the refrigerant inlet header portion and the refrigerant outlet header portion, a refrigerant passage having both ends opened, and the refrigerant inlet / outlet member A connecting device for a heat exchanger that is joined, and between the plates of the refrigerant inlet / outlet member, one end communicates with the refrigerant inlet of the refrigerant inlet header and the other end opens at one side edge of the refrigerant inlet / outlet member. An inflow path serving as an inlet, and an outflow path having one end communicating with the refrigerant outlet of the refrigerant outlet header portion and the other end serving as an outlet opened at a side edge portion where the inflow passage in the refrigerant inlet / outlet member is opened, Formed by bulging outwardly at least one of the plate and the second plate, on the inlet side end of the inner peripheral surface of the inflow path of the refrigerant inlet / outlet member and on the inner peripheral surface of the outflow path The end portion on the outlet side of the refrigerant inlet / outlet member has a tapered shape gradually narrowing toward the side edge where the inflow passage and the outflow passage of the refrigerant inlet / outlet member are opened, and around the one end opening of each refrigerant passage of the heat exchanger connection device In addition, a fitting convex portion that is fitted in the inlet side end portion of the refrigerant inlet / outlet passage and the outlet side end portion of the outlet passage is provided, and the outer peripheral surface of the fitting convex portion gradually becomes thicker toward the protruding end side. In the state where the tapered portion of the outer peripheral surface of the fitting convex portion of the connection member for heat exchanger is along the tapered portion of the inner peripheral surface of the refrigerant inlet / outlet member, A heat exchanger in which a fitting convex portion of a connection member for a heat exchanger is fitted into an inlet side end portion of an inflow passage and an outlet side end portion of an outflow passage of a refrigerant inlet / outlet member and joined to the refrigerant inlet / outlet member.

  2) The inlet-side end on the inner peripheral surface of the inlet / outlet passage of the refrigerant inlet / outlet member and the outlet-side end on the inner peripheral surface of the outlet / outlet passage face the side edges of the inlet / outlet passage of the refrigerant inlet / outlet member. The tapered conical surface with a reduced diameter is formed, and the outer peripheral surface of the fitting convex portion of the connection device for heat exchanger is a tapered conical surface with a diameter increased toward the protruding end side 1) The described heat exchanger.

  3) The first plate and the second plate of the refrigerant inlet / outlet member are respectively formed with an outward bulging portion for inflow passage and an outward bulging portion for outflow passage, and the peripheral walls of the outward bulging portion for inflow passage of both plates The inlet side end of the inflow channel and the outlet side end of the outflow channel in the peripheral wall of the outer bulge for the outflow channel have a semi-tapered cylindrical shape whose diameter decreases toward the side edge of the refrigerant inlet / outlet member. The heat exchanger according to 1) or 2) above.

  4) The heat exchanger according to any one of 1) to 3), wherein the fitting convex portion of the connection device for a heat exchanger has a tapered cylindrical shape whose diameter increases toward the protruding end side.

  5) The heat exchanger connecting device includes a block-shaped main body and two cylindrical bodies fixed in a penetrating manner to the block-shaped main body, and the cylindrical body serves as a refrigerant passage, and the block in the cylindrical body. 4. The heat exchanger according to 4) above, wherein a tapered cylindrical fitting convex portion is formed at a portion protruding from the main body.

  6) An intermediate plate is interposed between the first plate and the second plate of the refrigerant inlet / outlet member, and the intermediate plate is joined to the first plate and the second plate, and the inflow passage and the outflow passage are connected to the intermediate plate. Through the outer bulges for the inflow passages of the first and second plates and the outer bulges for the outflow passages of the first and second plates so that they cross each other when viewed from the stacking direction of all the plates. Notches and through-holes are formed, and the notch inward toward the opening end is formed on both side edges of the notch that forms the inlet side end of the inflow passage and the outlet side end of the outflow passage in the intermediate plate. In any one of the above 1) to 5), an inclined portion is formed, and the inclined portion is along the tip portion of the outer peripheral surface of the fitting convex portion of the connection device for a heat exchanger. Heat exchanger.

  According to the heat exchangers of the above 1) to 6), the refrigerant inlet / outlet member having the laminated first plate and the second plate and joined across the refrigerant inlet header portion and the refrigerant outlet header portion, both ends And a heat exchanger connecting device joined to the refrigerant inlet / outlet member. One end of the refrigerant inlet / outlet member communicates with the refrigerant inlet of the refrigerant inlet header portion. An inflow path whose end is an inlet opened to one side edge of the refrigerant inlet / outlet member, and a side edge where one end communicates with the refrigerant outlet of the refrigerant outlet header and the other end opens the inflow path of the refrigerant inlet / outlet member An outlet passage that is an outlet opening is formed by expanding at least one of the first plate and the second plate outward, and is open at one end of each refrigerant passage of the connection device for heat exchanger of Since fitting protrusions are provided around the inlet side end of the inlet / outlet channel of the refrigerant inlet / outlet member and the outlet side end of the outlet channel, the pipe bent like the evaporator described in Patent Document 1 is provided. There is no need to use it. Therefore, the connection device for heat exchangers can be installed near the heat exchanger. And when the heat exchanger of said 1) -6) is applied, for example to an evaporator, compared with the evaporator of patent document 1, the expansion valve attachment member as a connection apparatus for heat exchangers is near the evaporator. It becomes possible to install, and the position of the expansion valve is also close to the evaporator.

  Also, the end on the inlet side on the inner peripheral surface of the inflow path of the refrigerant inlet / outlet member and the end on the outlet side of the inner peripheral surface of the outlet / outlet path face the side edge of the inlet / outlet path of the refrigerant input / output member that is open. The outer peripheral surface of the fitting convex portion of the heat exchanger connecting device has a tapered shape whose diameter increases toward the protruding end side, and the fitting convex of the connecting member for heat exchanger The fitting convex part of the connecting member for the heat exchanger is inflow of the refrigerant inlet / outlet member with the tapered part of the outer peripheral surface of the part along the tapered part of the inner peripheral surface of the inlet / outlet path of the refrigerant inlet / outlet member. Since the heat exchanger is fitted into the opening at the other end of the passage and the outflow passage, the heat exchanger connecting device can be put into and out of the refrigerant by temporarily fixing both plates of the refrigerant inlet / outlet member with an appropriate means when manufacturing the heat exchanger. It can be temporarily fixed to the member, and the connection device for the heat exchanger As compared with the case of temporarily fixing the refrigerant and out member by another suitable means, the workability is improved.

  According to the heat exchanger of the above 3), the end on the inlet side of the inner peripheral surface of the inflow path of the refrigerant inlet / outlet member and the end of the outlet side on the inner peripheral surface of the outflow path are connected to the side edge of the refrigerant input / output member. It is possible to relatively easily form a tapered shape that gradually becomes thinner.

  According to the heat exchanger of 5), it is relatively easy to form the fitting convex portion into a tapered cylindrical shape like the heat exchanger of 4).

1 is a partially cutaway perspective view showing an overall configuration of an evaporator to which a heat exchanger according to the present invention is applied. FIG. 2 is a partially cut-away vertical sectional view seen from the right side, cut at a portion of a first plate of a refrigerant inlet / outlet member in the evaporator of FIG. 1. It is the horizontal sectional view which expanded the portion of the fitting convex part of an expansion valve attachment member. It is a disassembled perspective view which shows the refrigerant | coolant inlet / outlet member and expansion valve attachment member of the evaporator of FIG. It is a disassembled perspective view which shows the structure of the principal part of the refrigerant | coolant in / out member and expansion valve attachment member of the evaporator of FIG.

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

  In the embodiment described below, the heat exchanger according to the present invention is applied to an evaporator of a car air conditioner using a chlorofluorocarbon refrigerant, and the connection device for the heat exchanger is an expansion valve mounting member.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum. Further, in the following description, the downstream side of the air flowing in the ventilation gap between adjacent heat exchange tubes (the direction indicated by the arrow X in FIG. 1, the right side in FIG. 2) is referred to as the front, and the opposite side is referred to as the rear. The up and down, left and right (up and down, left and right in FIG. 1) when viewing the front from the rear are referred to as up and down and left and right.

  FIG. 1 shows the overall configuration of the evaporator, and FIGS. 2 to 5 show the configuration of the main part of the evaporator.

  1 and 2, an evaporator (1) used in a car air conditioner using a chlorofluorocarbon refrigerant has an aluminum first header tank (2) and an aluminum second header tank arranged at intervals in the vertical direction. (3), a heat exchange core (4) provided between the header tanks (2) and (3), and an aluminum refrigerant inlet / outlet member (5) joined to the right end of the first header tank (2) And an aluminum expansion valve mounting member (6) joined to the refrigerant inlet / outlet member (5).

  The first header tank (2) is located on the front side (downstream side in the ventilation direction) and extends in the left-right direction, and on the rear side (upstream side in the ventilation direction) and extends in the left-right direction. And a refrigerant outlet header portion (8) integrated with the refrigerant inlet header portion (7). A refrigerant inlet (9) is provided at the right end of the refrigerant inlet header (7), and a refrigerant outlet (11) is provided at the right end of the refrigerant outlet header (8).

  The second header tank (3) is located on the front side and extends in the left-right direction, and is integrated with the first intermediate header portion (12) located on the rear side and extending in the left-right direction. And a second intermediate header portion (13). The first intermediate header portion (12) and the second intermediate header portion (13) are formed by dividing the inside of the second header tank (3) into two front and rear spaces by a partition member (14). The inside of the first intermediate header portion (12) and the inside of the second intermediate header portion (13) are communicated with the partition member (14) through a plurality of communication holes (15) formed at intervals in the left-right direction. It has been.

  The heat exchange core section (4) is composed of a plurality of heat exchange pipe groups (17) composed of a plurality of heat exchange pipes (16) arranged in parallel at intervals in the left-right direction. Are arranged in two rows, the ventilation gap between adjacent heat exchange tubes (16) of each heat exchange tube group (17), and the heat exchange tubes (16) at the left and right ends of each heat exchange tube group (17). Corrugated fins (18) are arranged on the outside and brazed to the heat exchange pipe (16), and aluminum side plates (19) are arranged on the outside of the corrugated fins (18) on both the left and right ends, respectively. It is configured by brazing to 18). The upper and lower ends of the heat exchange pipe (16) of the front side heat exchange pipe group (17) are connected to the refrigerant inlet header part (7) and the first intermediate header part (12), and the heat of the rear side heat exchange pipe group (17). The upper and lower ends of the exchange pipe (16) are connected to the refrigerant outlet header part (8) and the second intermediate header part (13). Then, the refrigerant inlet header portion (7) and the refrigerant outlet header portion (7) are formed by the heat exchange pipe (16) of the front and rear heat exchange tube group (17) and the first and second intermediate header portions (12) and (13). 8) A refrigerant circulation path is formed through. The heat exchange tube (16) has a flat shape having a plurality of refrigerant passages arranged in the width direction and arranged in the width direction in the front-rear direction. The corrugated fin (18) is formed in a wave shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, and is shared by both the front and rear heat exchange tubes (16) constituting the front and rear heat exchange tube group (17). Has been.

  As shown in FIGS. 2 to 5, the refrigerant inlet / outlet member (5) has a vertical aluminum first plate (21) located on the left side (first header tank (2) side) and a vertical shape located on the right side. The aluminum second plate (22) and the vertical aluminum intermediate plate (23) positioned between the first plate (21) and the second plate (22) are laminated and brazed. It is joined across the right end of the refrigerant inlet header (7) and the refrigerant outlet header (8) of the first header tank (2). The refrigerant inlet / outlet member (5) has one end leading to the refrigerant inlet (9) of the refrigerant inlet header (7) and the other end opened to the rear edge of the refrigerant inlet / outlet member (5), and an inflow path (24), One end leads to the refrigerant outlet (11) of the refrigerant outlet header (8) and the other end is the rear edge of the refrigerant inlet / outlet member (5) (the side edge where the inflow passage (24) in the refrigerant inlet / outlet member (5) is opened) ) And an outflow passage (25) opened. The opening to the rear edge of the refrigerant inlet / outlet member (5) in the inflow passage (24) is called an inlet (24a), and the opening to the rear edge of the refrigerant inlet / outlet member (5) in the outlet passage (25) is an outlet (25a ).

  A first communication port (26) communicating with the refrigerant inlet (9) of the refrigerant inlet header (7) and the refrigerant outlet (11) of the refrigerant outlet header (8) are connected to the first plate (21) of the refrigerant inlet / outlet member (5). ) Leading to the second communication port (27), one end is located away from the first and second communication ports (26) and (27), and the other end is opened to the rear edge of the first plate (21) A first semi-circular inflow channel first outward bulging portion (28), one end of which is located away from the first and second communication ports (26), (27) and the other end of the first plate (21) The first outer bulging portion (29) for the outflow passage having a semicircular cross section that opens above the other end opening of the first outer bulging portion (28) for the inflow passage at the rear edge, and the lower end portion Vertically located at a position slightly above the second communication port (27) and having an upper end at a height slightly below the other end opening of the first outward bulging portion (28) for the inflow passage A second outward bulging portion (31) for the outflow passage is formed.

  The second plate (22) of the refrigerant inlet / outlet member (5) has one end at a position away from the first and second communication ports (26), (27) of the first plate (21) and the other end at the first plate. The second outside for the inflow passage having a semicircular cross section opened at the rear edge of the second plate (22) at the same height as the other end of the first outward bulge portion (28) for the inflow passage of (21) The side bulge portion (32) has one end at a position corresponding to the first communication port (26) of the first plate (21) and the other end connected to the second communication port (27) of the first plate (21) and the inflow. The third outward bulge portion (33) for the inflow passage having a semicircular cross section at a position away from the second outward bulge portion (32) for the road, and the second communication of the first plate (21) at one end Located at the position corresponding to the opening (27) and the other end opened at the rear edge of the second plate (22) at the same position as the first outward bulging portion (29) for the outflow passage of the first plate (21) A third semi-circular outflow section (34) for the outflow channel is formed To have.

  One end of the refrigerant inlet / outlet member (5) is connected to the rear edge of the intermediate plate (23) at the same position as the first outward bulging portion (28) for the inflow passage of the first plate (21). Open and let it pass through the inside of the first outward bulge portion (28) for the inflow passage of the first plate (21) and the inside of the second outward bulge portion (32) for the inflow passage of the second plate (22). The first notch (35), the inside of the first outward bulge portion (28) for the inflow passage of the first plate (21) and the third outward bulge portion (33 for the inflow passage of the second plate (22)) ) In the first through hole (36) to be passed through, the first communication port (26) of the first plate (21) and the third outward bulging portion (33) for the inflow passage of the second plate (22) The second through hole (37) through which one end is opened at the rear edge of the intermediate plate (23) at the same position as the first outward bulging portion (29) for the outflow passage of the first plate (21) And the third outward bulge for the outflow passage of the first plate (21) and the outflow passage for the outflow passage of the second plate (22). A second notch (38) that passes through the inside of the portion (34), a second communication port (27) of the first plate (21), and a third outward bulge portion for the outflow passage of the second plate (22) ( 34) a third through hole (39) that passes through the inside, and a third outside outlet (31) for the outflow passage of the first plate (21) and a third for the outflow passage of the second plate (22). A fourth through hole (41) is formed through the inside of the outward bulge portion (34).

  The first plate (21) and the second plate (22) are formed using an aluminum brazing sheet having a brazing material layer on both sides. The intermediate plate (23) is formed using an aluminum brazing sheet or an aluminum brazing sheet having a brazing filler metal layer on both sides.

  The first outward bulging portion (28) for the inflow passage of the first plate (21) includes a vertical portion (28a) extending upward from a position slightly above the first communication port (26), and a vertical portion (28a). And a horizontal portion (28b) extending rearward and extending to the rear edge of the first plate (21). The first outward bulging portion (29) for the outflow passage of the first plate (21) is located above the horizontal portion (28b) of the first outward bulging portion (28) for the inflow passage. ) A portion extending horizontally forward from a position higher than the first outward bulging portion (28) for the inflow passage at the rear edge is inclined forward and obliquely downward. The front end portion of the outflow passage first outer bulge portion (29) is positioned at the center in the front-rear direction of the horizontal portion (28b) of the first inflow passage bulge portion (28). The upper end of the second outward bulging portion (31) for the outflow passage of the first plate (21) is slightly lower than the horizontal portion (28b) of the first outward bulging portion (28) for the inflow passage. In position.

  The second outward bulging portion (32) for the inflow passage of the second plate (22) is the same as the horizontal portion (28b) of the first outward bulging portion (28) for the inflow passage of the first plate (21). In the height position, it extends horizontally forward from the rear edge of the second plate (22), and its front end portion is located slightly rearward of the third outward bulging portion (34) for the outflow passage. The third outward bulging portion (33) for the inflow passage of the second plate (22) has a vertical shape extending upward from a position corresponding to the first communication port (26) of the first plate (21). The upper end portion of the third outward bulging portion (33) for the inflow passage is above the lower end of the vertical portion (28a) of the first outward bulging portion (28) for the inflow passage of the first plate (21). positioned. The third outward bulging portion (34) for the outflow passage of the second plate (22) extends upward from a position corresponding to the second communication port (27) of the first plate (21), and the second inflow passage second. A vertical portion (34a) extending upward from the outward bulge portion (32), and a horizontal portion (34b) extending rearwardly to the upper end of the vertical portion (34a) and reaching the rear edge of the first plate (21). ). The front edge of the upper part of the vertical part (34a) extends forward to increase the flow path area. The upper edge of the portion near the front end of the horizontal portion (34b) is inclined forward to match the upper edge of the portion of the first plate (21) near the front end of the first outward bulge portion (29) for the outflow passage. Inclined downward.

  The shape of the first cutout (35) of the intermediate plate (23) matches the shape of the second outward bulging portion (32) for the inflow passage as viewed from the right side. The first through hole (36) of the intermediate plate (23) has a lower end portion of the vertical portion (28a) of the first outward bulging portion (28) for the inflow passage of the first plate (21) and the second plate (22 ) Is in a position where the upper ends of the third outward bulging portion (33) for the inflow passage overlap each other when viewed from the right side. The second through hole (37) of the intermediate plate (23) is located at a position corresponding to the first communication port (26) of the first plate (21). And the part between the 1st through-hole (36) and the 2nd through-hole (37) in the intermediate | middle plate (23) is excised, and both through-holes (36) ( 37) is communicated. The shape of the first through hole (36), the second through hole (37), and the cutout part (42) is the same as that of the third outward bulge part (33) for the inflow passage of the second plate (22). It matches the shape seen from the above. The shape of the second notch (38) of the intermediate plate (23) matches the shape of the outflow channel first outward bulge portion (29) viewed from the right side. The third through hole (39) of the intermediate plate (23) is located at a position corresponding to the second communication port (27) of the first plate (21). The fourth through hole (41) of the intermediate plate (23) is the second outer bulge portion (31) for the outflow passage of the first plate (21) and the third outer side for the outflow passage of the second plate (22). The vertical part (34a) of the bulging part (34) is located at the overlapping position when viewed from the right side. And the part between the 3rd through-hole (39) and the 4th through-hole (41) in the intermediate | middle plate (23) is excised, and both through-holes (39) ( 41) is communicated.

  Accordingly, the first communication port (26) of the first plate (21) and the first outward bulging portion (28) for the inflow passage and the second outward bulging portion for the inflow passage of the second plate (22) ( 32) and the third outward bulge portion (33) for the inflow passage, the first notch (35), the first through hole (36), the second through hole (37) and the cut portion of the intermediate plate (23). (42) forms an inflow path (24) in the refrigerant inlet / outlet member (5), the second communication port (27) of the first plate (21), the first outer bulging portion (29) for the outflow path, and The second outward bulge portion (31) for the outflow passage, the third outward bulge portion (34) for the outflow passage of the second plate (22), and the second notch (38) of the intermediate plate (23) The third through hole (39), the fourth through hole (41), and the cut portion (43) form an outflow path (25) in the refrigerant inlet / outlet member (5), and the inflow path (24) and the outflow path (25) intersects the entire plate (21), (22), and (23) in the stacking direction, that is, from the left or right side without being communicated with the interior thereof.

  The peripheral wall of the inflow channel first outer bulge portion (28) of the first plate (21) of the refrigerant inlet / outlet member (5) and the second outer bulge portion (32) for the inflow channel of the second plate (22). The inlet (24a) side end of the inflow channel (24) in the peripheral wall is a semi-tapered cylinder having a diameter that decreases toward the rear edge of the refrigerant inlet / outlet member (5). The inner peripheral surfaces of the semi-tapered cylindrical portions (44) and (45) are partially conical. Further, the peripheral wall of the first outer bulging portion (29) for the outflow passage of the first plate (21) of the refrigerant inlet / outlet member (5) and the third outer bulging portion for the outflow passage of the second plate (22) ( The outlet (25a) side end of the outflow passage (25) in the peripheral wall of (34) has a semi-tapered cylindrical shape whose diameter decreases toward the rear edge of the refrigerant inlet / outlet member (5). The inner peripheral surfaces of the semi-tapered cylindrical portions (46) and (47) are partially conical. Furthermore, the first notch (35) forming the inlet (24a) side portion of the inflow passage (24) in the intermediate plate (23) of the refrigerant inlet / outlet member (5) and the outlet (25a) side of the outflow passage (25) Inclined portion (48) inclined inward of each notch (35) (38) toward the open end (rear) at the rear end of the upper and lower side edges of the second notch (38) forming the portion of ) (49) is formed. The inclination angle of the inclined portions (48) and (49) is determined by the two corresponding half-tapered cylindrical portions (44) (45) (46) (47) of the first and second plates (21) and (22). The taper angle of the combined tapered cylindrical portions (51) and (52) is ½. Therefore, the end on the inlet (24a) side on the inner peripheral surface of the inflow path (24) of the refrigerant inlet / outlet member (5) and the end on the outlet (25a) side on the inner peripheral surface of the outflow path (25) are A tapered conical surface (53) (54) having a diameter decreasing toward the rear edge of the member (5).

  The expansion valve mounting member (6) includes a vertically long aluminum block body (55) and two aluminum cylindrical bodies (56) (57) fixed to the block body (55) in a penetrating manner. . The block-shaped main body (55) has two through holes (58) and (59) having a circular cross section at intervals in the vertical direction, and two cylindrical bodies (56) are formed in the through holes (58) and (59). ) (57) is passed through and is fixed to the block-shaped body (55). The lower cylindrical body (56) has a high-pressure refrigerant passage (6a), and the upper cylindrical body (57) has a low-pressure refrigerant passage (6b). Both cylindrical bodies (56) (57) The protrusions that protrude from the block-shaped main body (55) to the rear (refrigerant inlet / outlet member (5)) side are fitted into the inflow passage (24) and the outflow passage (25) of the refrigerant inlet / outlet member (5) ( 61) (62). The fitting projections (61) and (62) of the expansion valve mounting member (6) have a tapered cylindrical shape with a diameter increasing toward the protruding end side, whereby the fitting projections (61) and (62) ) Is a tapered conical surface (63) (64) whose diameter increases toward the protruding end. The taper angle of the tapered conical surfaces (63) and (64) of the fitting convex portions (61) and (62) is determined on the inlet (24a) side of the inner peripheral surface of the inflow passage (24) of the refrigerant inlet / outlet member (5). The taper angle of the tapered conical surfaces (53) and (54) at the end on the outlet (25a) side on the end and the inner peripheral surface of the outflow passage (25) is substantially equal. Then, the tapered conical surfaces (63), (64) of the outer peripheral surfaces of the fitting convex portions (61), (62) of the expansion valve mounting member (6) are the inflow passage (24) of the refrigerant inlet / outlet member (5) and The fitting convex portions (61), (62) of the expansion valve mounting member (6) are in close contact with the tapered conical surfaces (53), (54) of the inner peripheral surface of the outflow passage (25), and the refrigerant inlet / outlet member ( It is fitted into the inlet (24a) side end of the inflow passage (24) and the outlet (25a) side end of the outflow passage (25), and is brazed to the refrigerant inlet / outlet member (5).

  The above-described evaporator (1) is manufactured by combining all parts and brazing them together. When the evaporator (1) is manufactured, when the three plates (21), (22) and (23) of the refrigerant inlet / outlet member (5) are stacked, the first outward expansion for the inflow passage of the first plate (21) The outlet portion (28) and the first outward bulge portion (29) for the outflow passage, the second outward bulge portion (32) for the inflow passage of the second plate (22), and the third outward bulge for the outflow passage The both fitting projections (61) and (62) of the expansion valve mounting member (6) are sandwiched between the protruding portion (34) and the fitting projections (61) and (62) of the expansion valve mounting member (6). The tapered conical surfaces (63), (64) on the outer peripheral surface of the refrigerant are tapered conical surfaces (53), (54) on the inner peripheral surface of the inflow passage (24) and the outflow passage (25) of the refrigerant inlet / outlet member (5). Almost closely to. In this state, when the three plates (21), (22), and (23) are temporarily fixed by appropriate means, the expansion valve mounting member (6) has three plates (5) constituting the refrigerant inlet / outlet member (5). 21) Temporarily fixed to (22) and (23). Therefore, the expansion valve mounting member (6) is prevented from falling off from the three plates (21), (22) and (23).

The evaporator (1) constitutes a refrigeration cycle using a chlorofluorocarbon refrigerant together with a compressor and a condenser as a refrigerant cooler, and is mounted on a vehicle, for example, an automobile, as a car air conditioner. At this time, the expansion valve (not shown) is attached to the expansion valve mounting member (6) so that the low-pressure refrigerant discharge path is located above and the high-pressure refrigerant supply path is located below. During the cooling operation, the gas-liquid mixed phase two-phase refrigerant that has passed through the high-pressure refrigerant supply passages of the compressor, the condenser, and the expansion valve passes through the high-pressure refrigerant passage (6a) of the expansion valve mounting member (6). ) Enters the inflow path (24) from the rear edge inlet (24a), flows through the inflow path (24), and enters the refrigerant inlet (9) of the first header tank (2) from the first communication port (26). ) Through the refrigerant inlet header (7). The refrigerant that has entered the refrigerant inlet header (7) is divided into the heat exchange pipe (16) of the front heat exchange pipe group (17), the first intermediate header part (12) of the second header tank (3), the partition member ( 14) the communication hole (15), the second intermediate header section (13), the heat exchange pipe (16) of the rear heat exchange pipe group (17) and the refrigerant outlet header section (8) in sequence, The refrigerant enters the outflow path (25) of the refrigerant inlet / outlet member (5) from the second communication port (27) through the refrigerant outlet (11) of (8). The refrigerant that has entered the outflow passage (25) flows through the outflow passage (25), out of the outlet (25a) at the rear edge of the refrigerant inlet / outlet member (5), and flows through the low pressure refrigerant passage of the expansion valve mounting member (6). The refrigerant enters the low-pressure refrigerant discharge path of the expansion valve through (6b), and is sent to the compressor through the low-pressure refrigerant discharge path.
While the refrigerant flows through the heat exchange pipe (16), heat exchange is performed with air (see arrow X in FIG. 1) passing through the ventilation gap between the adjacent heat exchange pipes (16). And then leak.

  In the heat exchanger according to the present invention, a plurality of flat hollow bodies formed by brazing peripheral edges with a pair of plate-shaped plates facing each other are arranged in parallel, and are arranged side by side in the front-rear direction. A refrigerant inlet header section and a refrigerant outlet header section, a refrigerant turn section disposed at a distance from both header sections, a plurality of refrigerant forward refrigerant circulation sections that communicate the refrigerant inlet header section and the refrigerant turn section, The refrigerant outlet header section and a plurality of refrigerant return-side refrigerant circulation sections that communicate with the refrigerant turn section are provided. A refrigerant inlet is formed at one end of the refrigerant inlet header section, and the same end as the refrigerant inlet in the refrigerant outlet header section A refrigerant outlet is formed in the refrigerant inlet header portion from the refrigerant inlet to the refrigerant turn portion through the refrigerant outlet side refrigerant circulation portion, where the flow direction is changed and the refrigerant return side refrigerant circulation portion is passed. Returning to the refrigerant outlet header section Te is also applicable to a so-called laminated evaporator that going on format to be sent out from the refrigerant outlet.

  The heat exchanger according to the present invention is suitably used for an evaporator of a refrigeration cycle constituting a car air conditioner.

(1): Evaporator (heat exchanger)
(5): Refrigerant input / output member
(6): Expansion valve mounting member (connector for heat exchanger)
(6a) (6b): Refrigerant passage
(7): Refrigerant inlet header
(8): Refrigerant outlet header
(9): Refrigerant inlet
(11): Refrigerant outlet
(21): First plate
(22): Second plate
(23): Intermediate plate
(24): Inflow channel
(24a): Entrance
(25): Outflow channel
(25a): Exit
(28) (32) (33): Outward bulge for inflow passage
(29) (31) (34): Outward bulge for outlet
(36) (37) (39) (41): Through hole
(35) (38): Notch
(44) (45) (46) (47): Semi-tapered cylindrical part
(53) (54): Tapered conical surface
(55): Block body
(56) (57): Cylindrical body
(61) (62): Mating convex part
(63) (64): Tapered conical surface

Claims (6)

A refrigerant inlet header section and a refrigerant outlet header section arranged side by side in the ventilation direction, and a refrigerant circulation path through both the header sections, a refrigerant inlet is formed at one end of the refrigerant inlet header section, and a refrigerant outlet A refrigerant outlet is formed at the same end as the refrigerant inlet in the header portion, and the refrigerant flowing into the refrigerant inlet header portion from the refrigerant inlet returns to the refrigerant outlet header portion through the refrigerant circulation path and is sent out from the refrigerant outlet. In the heat exchanger
A refrigerant inlet / outlet member having the first and second plates stacked and joined across the refrigerant inlet header portion and the refrigerant outlet header portion, a refrigerant passage having both ends opened, and the refrigerant inlet / outlet member A connecting device for a heat exchanger that is joined, and between the plates of the refrigerant inlet / outlet member, one end communicates with the refrigerant inlet of the refrigerant inlet header and the other end opens at one side edge of the refrigerant inlet / outlet member. An inflow path serving as an inlet, and an outflow path having one end communicating with the refrigerant outlet of the refrigerant outlet header portion and the other end serving as an outlet opened at a side edge portion where the inflow passage in the refrigerant inlet / outlet member is opened, Formed by bulging outwardly at least one of the plate and the second plate, on the inlet side end of the inner peripheral surface of the inflow path of the refrigerant inlet / outlet member and on the inner peripheral surface of the outflow path The end portion on the outlet side of the refrigerant inlet / outlet member has a tapered shape gradually narrowing toward the side edge portion where the inflow passage and the outflow passage of the refrigerant inlet / outlet member are opened, and around the one end opening of each refrigerant passage of the connection device for heat exchanger. In addition, a fitting convex portion is provided that is fitted in the inlet side end portion of the refrigerant inlet / outlet passage and the outlet side end portion of the outlet passage, and the outer peripheral surface of the fitting convex portion gradually increases toward the protruding end side. In the state where the tapered portion of the outer peripheral surface of the fitting convex portion of the connection member for heat exchanger is along the tapered portion of the inner peripheral surface of the refrigerant inlet / outlet member, A heat exchanger in which a fitting convex portion of a connection member for a heat exchanger is fitted into an inlet side end portion of an inflow passage and an outlet side end portion of an outflow passage of a refrigerant inlet / outlet member and joined to the refrigerant inlet / outlet member. The inlet side end on the inner peripheral surface of the inlet / outlet passage of the refrigerant inlet / outlet member and the outlet end on the inner peripheral surface of the outlet / outlet passage have diameters toward the side edges of the inlet / outlet passage of the refrigerant inlet / outlet member that are open. 2. A tapered conical surface having a reduced diameter, and the outer peripheral surface of the fitting convex portion of the connection device for a heat exchanger is a tapered conical surface having a diameter increasing toward the protruding end. Heat exchanger. The first plate and the second plate of the refrigerant inlet / outlet member are respectively formed with an outward bulge portion for the inflow passage and an outward bulge portion for the outflow passage, and the inflow at the peripheral walls of the outward bulge portions for the inflow passages of both plates The outlet side end portion of the passage and the outlet side end portion of the outflow passage in the peripheral wall of the outward bulge portion for the outflow passage are formed in a semi-tapered cylindrical shape whose diameter is reduced toward the side edge portion of the refrigerant inlet / outlet member. The heat exchanger according to claim 1 or 2. The heat exchanger according to any one of claims 1 to 3, wherein the fitting convex part of the connection device for a heat exchanger has a tapered cylindrical shape whose diameter increases toward the protruding end side. The connection device for a heat exchanger includes a block-shaped main body and two cylindrical bodies fixed in a penetrating manner to the block-shaped main body, and the cylindrical body serves as a refrigerant passage, and the block-shaped main body in the cylindrical body The heat exchanger according to claim 4, wherein a tapered cylindrical fitting convex portion is formed at a portion protruding from the cylindrical portion. An intermediate plate is interposed between the first plate and the second plate of the refrigerant inlet / outlet member, and the intermediate plate is joined to the first plate and the second plate. The intermediate plate has an inflow path and an outflow path. Cut through the outer bulges for the inflow passages of the first and second plates and the outer bulges for the outflow passages of the first and second plates so that they intersect when viewed from the stacking direction of all the plates. A notch and a through-hole are formed, and the notch is inclined inward toward the opening end at both side edges of the notch that forms the inlet-side end of the inflow passage and the outlet-side end of the outflow passage in the intermediate plate. The heat exchange according to any one of claims 1 to 5, wherein an inclined portion is formed, and the inclined portion is along a tip portion of the outer peripheral surface of the fitting convex portion of the connection device for a heat exchanger. vessel.

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