JP2009121783A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of suppressing degradation of short-circuiting prevention effect between a refrigerant inflow port and a refrigerant outflow port of a liquid receiver. <P>SOLUTION: A desiccant unit 10 is disposed in the liquid receiver 7 mounted on a left tank 2 of the heat exchanger. The liquid receiver 7 has a cylindrical body 26, and a plug 28 screwed and fitted in a top end opening of the body 26. A refrigerant inflow port 32 and a refrigerant outflow port 33 are formed on the liquid receiver 7 in a state that the former is positioned at an upper part. A circular part 49 projecting inward is formed on a height position between both ports 32, 33 on a peripheral wall of the body 26. The desiccant unit 10 has an upper frame part 51 disposed between the circular part 49 and the plug 28. A top face of the annular part 49 and a bottom end face of the upper frame part 51 are applied as seal faces 65, 66, and an O-ring 64 is disposed between the seal faces 65, 66. A part between both seal faces 65, 66 is sealed by the O-ring 64 by pressing the upper frame part 51 downward by the plug 28. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat exchanger used in, for example, a refrigeration cycle constituting a car air conditioner.

  In this specification and claims, the top and bottom of FIG.

  In recent years, as a heat exchanger of a refrigeration cycle that constitutes a car air conditioner, for example, an interval between each other can be improved for the purpose of improving assembling to a vehicle body, saving installation space, and improving the refrigeration capacity of a refrigeration cycle A pair of vertically extending tanks disposed at a distance from each other, and a plurality of heat exchange tubes disposed in parallel with a space in the vertical direction between both tanks and having both ends connected to both tanks, A fin disposed between adjacent heat exchange tubes, a vertically extending liquid receiver attached to one of the tanks, and a desiccant unit disposed in the liquid receiver and having a desiccant. Both tanks are partitioned into two headers in the length direction of the tank by partition walls provided at the same height, and a function as a capacitor is provided above the partition walls. A condensing part is provided, and a subcooling part having a function as a supercooler is provided at a lower part than both partition walls, and the liquid receiver extends in the vertical direction and has a cylindrical shape with at least an upper end opened. A main body, and a closing member that closes both end openings of the cylindrical main body, and a refrigerant inlet that feeds the refrigerant into the liquid receiver from the header of the condensing unit in the tank to the peripheral wall of the cylindrical main body of the liquid receiver. The refrigerant outlet for sending the refrigerant from the liquid receiver to the header of the supercooling unit in the tank is formed so that the former is located above, the desiccant unit is cylindrical with both upper and lower ends closed, and the refrigerant flow A frame extending from above the inlet to below the refrigerant outlet, a plurality of through holes formed in the peripheral wall of the frame, a mesh fixed to the peripheral wall of the frame and closing the through hole, and filled in the frame An outward-facing flange made of desiccant and having an outer peripheral edge abutting against the inner peripheral surface of the cylindrical body of the receiver at the height position between the refrigerant inlet and the refrigerant outlet of the frame Is formed integrally, and a heat exchanger in which a short circuit between the refrigerant inlet and the refrigerant outlet is prevented by the outward flange is known (see Patent Document 1).

  By the way, in the heat exchanger of patent document 1, since the short circuit prevention effect between the refrigerant | coolant inflow port and a refrigerant | coolant outflow port by the outward flange of a desiccant unit is not enough, an annular groove is formed in the outer peripheral surface of an outward flange. It is considered that an O-ring is disposed in the annular groove and the space between the outward flange and the inner peripheral surface of the cylindrical body of the liquid receiver is sealed by the O-ring.

However, in this case, when the desiccant unit is inserted into the cylindrical body of the liquid receiver, the O-ring rubs against the inner peripheral surface of the cylindrical body and the O-ring extends or is damaged. As a result, there is a problem that the short-circuit prevention effect between the refrigerant inlet and the refrigerant outlet of the liquid receiver is reduced.
JP-A-2005-305501

  An object of the present invention is to provide a heat exchanger that solves the above-described problems and can suppress a reduction in the effect of preventing a short circuit between the refrigerant inlet and the refrigerant outlet of the liquid receiver.

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

1) A pair of tanks extending in the vertical direction spaced apart from each other, and a plurality of heats arranged in parallel with a space in the vertical direction between the tanks and both ends connected to both tanks. An exchange pipe, a fin disposed between adjacent heat exchange pipes, a liquid receiver attached to one of the tanks, and a desiccant unit disposed in the liquid receiver and having a desiccant. The liquid receiver has a cylindrical main body extending in the vertical direction and having at least one end opened, and a plug attached to the open end of the cylindrical main body. In the heat exchanger in which the refrigerant inlet for sending the refrigerant to and the refrigerant outlet for sending the refrigerant from the liquid receiver to the tank are formed so that the former is located above,
An annular portion projecting inward is provided at a height position between the refrigerant inlet and the refrigerant outlet on the peripheral wall of the cylindrical body of the liquid receiver, and the desiccant unit is disposed between the annular portion and the plug. A surface of the annular portion facing the plug side and a surface of the frame portion facing the annular portion side become a sealing surface, and a sealing member is disposed between both the sealing surfaces. A heat exchanger in which a gap between a sealing surface of the annular portion and a sealing surface of the frame portion is sealed by a sealing member when the frame portion of the unit is pressed toward the annular portion by a plug.

  2) The heat exchanger according to 1) above, wherein the seal member is an O-ring.

  3) The heat exchanger according to 1) above, wherein the seal member is formed integrally with the frame portion of the desiccant unit.

  4) The heat exchanger according to 3) above, wherein the frame part of the desiccant unit is made of a synthetic resin, and the sealing member is formed of a skirt-like part that is integrally formed with the frame part and extends outward toward the annular part.

  5) One of the ends of the frame part of the plug and desiccant unit is formed with a tapered hole with a small diameter toward the back, and the other with a small diameter toward the tip and fitted into the tapered hole. 5. The heat exchanger according to any one of 1) to 4), wherein a resin taper portion is formed, and the taper angle of the taper portion is larger than the taper angle of the taper hole.

  6) The heat exchanger according to 5) above, wherein a taper hole is formed in the plug, and a taper portion is formed in the frame portion of the desiccant unit.

  7) At the height position of the portion between the refrigerant inlet and the refrigerant outlet on the peripheral wall of the cylindrical body of the receiver, the partition plate is fixed to the cylindrical body of the receiver, The heat exchanger according to any one of 1) to 6) above, wherein a through hole is formed and a portion around the through hole in the partition plate is a tubular portion.

  8) The heat exchanger according to any one of 1) to 7) above, wherein a strainer is integrally formed in the desiccant unit.

  9) Both tanks are partitioned into two headers arranged in the vertical direction by partition walls at the same height position, and a condensing part having a function as a condenser is provided in a part above both partition walls, Similarly, a subcooling part having a function as a supercooler is provided below the two partition walls, and the refrigerant flowing out from the tank side header to which the condenser receiver is attached passes through the refrigerant inlet. The refrigerant that enters the liquid receiver and flows out from the refrigerant outlet of the tubular body of the liquid receiver flows into the header on the tank side where the liquid receiver of the supercooling unit is attached. ) To 8).

  According to the heat exchanger of 1) to 4) above, an annular portion protruding inward is provided at a height position between the refrigerant inlet and the refrigerant outlet on the peripheral wall of the cylindrical body of the liquid receiver, The desiccant unit has a frame portion disposed between the annular portion and the plug, and a surface of the annular portion facing the plug side and a surface of the frame portion facing the annular portion side are respectively used as seal surfaces. In addition, a seal member is disposed between both seal surfaces, and the frame portion of the desiccant unit is pressed against the annular portion side by the plug, thereby sealing between the seal surface of the annular portion and the seal surface of the frame portion by the seal member. Therefore, when the desiccant unit is inserted into the cylindrical body of the liquid receiver, the seal member does not rub against the inner peripheral surface of the cylindrical body. Therefore, the fall of the short circuit prevention effect between the refrigerant | coolant inflow port of a liquid receiver and a refrigerant | coolant outflow port resulting from a seal member being extended or damaged is suppressed.

  According to the heat exchangers 5) and 6) above, even if there is a slight dimensional error in the frame part of the desiccant unit, the cylindrical body of the receiver, the plug, etc., the frame part of the desiccant unit The plug can be reliably pressed to the annular portion side. Therefore, a decrease in sealing performance due to the sealing member between the sealing surface of the annular portion and the sealing surface of the frame portion is prevented.

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

  In this embodiment, the heat exchanger according to the present invention is applied to a heat exchanger in which a condensing part having a condenser function and a supercooling part having a supercooler function are integrated.

  In the following description, the left and right sides in FIG. 1 are referred to as left and right, the front side of FIG. In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  In addition, the same code | symbol is attached | subjected to the same part and the same thing through all drawings, and the overlapping description is abbreviate | omitted.

  This embodiment is shown in FIGS.

  FIG. 1 shows the overall configuration of the heat exchanger, and FIGS. 2 and 3 show the configuration of the main part thereof.

  In FIG. 1, the heat exchanger (1) has a width between a pair of left and right aluminum tanks (2) and (3) extending in the vertical direction and spaced apart from each other, and both tanks (2) and (3). A plurality of flat aluminum heat exchange tubes (4) with their directions directed in the front-rear direction and arranged in parallel at intervals in the vertical direction, and both left and right ends connected to both tanks (2) (3), respectively And an aluminum corrugated fin (5) brazed to the heat exchange pipe (4) between the adjacent heat exchange pipes (4) and outside the heat exchange pipes (4) at both upper and lower ends, and A pair of upper and lower aluminum side plates (6) disposed outside the corrugated fins (5) and brazed to the corrugated fins (5), and fixed to the left tank (2) via mounting members (8) A liquid receiver (7), and a desiccant unit (10) disposed in the liquid receiver (7).

  Both tanks (2) and (3) of the heat exchanger (1) are divided vertically by partition walls (9) and (11) at the same height at the bottom, thereby condensing the gas-phase refrigerant. Function of the condenser (12) having the function of a condenser to be a liquid phase, and the function of the supercooler for supercooling the liquid refrigerant condensed in the condenser (12) to a temperature lower by about 5 to 15 ° C. than the condensation temperature And a supercooling section (13) having a vertical line in the same vertical plane.

  Here, the part above the partition wall (9) in the left tank (2) is the left header (14) of the condensing part (12), and the part above the partition wall (11) in the right tank (3) Is the right header (15) of the condenser (12). Further, the part below the partition wall (9) in the left tank (2) is the left header (16) of the supercooling section (13), and the part below the partition wall (11) in the right tank (3) Is the right header (17) of the supercooling section (13).

  The right header (15) of the condensing part (12) is divided into an upper header part (15a) and a lower header by an aluminum first partition plate (18) for forming a passage group provided at a middle height position in the vertical direction. The left header (14) is divided by an aluminum second partition plate (19) for passage group formation provided at a lower position than the first partition plate (18). The upper header portion (14a) and the lower header portion (14b) are partitioned. The condensing part (12) is divided into a part above the first partition plate (18), a part between the partition plates (18) and (19), and a part below the second partition plate (19), respectively. A passage group (21), (22), (23) is provided which is composed of heat exchange pipes (4) arranged continuously in the vertical direction. The number of heat exchange pipes (4) constituting each of the passage groups (21), (22), and (23) decreases sequentially from the top. Further, the flow direction of the refrigerant in all the heat exchange pipes (4) constituting each passage group (21), (22), and (23) is the same, and two adjacent passage groups (21) (22) And the flow directions of the refrigerant in the heat exchange pipe (4) of (22) and (23) are different.

  An aluminum refrigerant inlet member (24) leading to a refrigerant inlet (not shown) is brazed to the upper end portion of the upper header portion (15a) of the right header (15) of the condensing portion (12), and the right side of the supercooling portion (13). An aluminum refrigerant outlet member (25) leading to a refrigerant outlet (not shown) is brazed to the header (17).

  The liquid receiver (7) includes a cylindrical main body (26) with both upper and lower ends open, an aluminum lower cap (27) brazed to the lower end of the cylindrical main body (26) to close the lower end opening, and a cylinder And a cylindrical plug (28) made of synthetic resin that is screwed into the upper end opening of the main body (26) and closes the upper end opening. The cylindrical body (26) includes an aluminum pipe (30) having a circular cross section and an aluminum stepped cylindrical member brazed to the upper end of the pipe (30) and having an inner peripheral surface of a cylindrical surface. It consists of a screw part (31).

  As shown in FIGS. 2 and 3, the refrigerant inlet (32) and the refrigerant outlet (33) are located above the peripheral wall of the pipe (30) of the cylindrical body (26) so that the former is located above. Is formed. The refrigerant inlet (32) is a refrigerant outlet formed in the lower header part (14b) of the left header (14) of the condensing part (12) via the refrigerant inflow path (34) formed in the mounting member (8). (35), the refrigerant outlet (33) is formed in the left header (16) of the supercooling section (13) through the refrigerant outflow path (36) formed in the mounting member (8). It is made to communicate with the refrigerant inlet (37). An aluminum partition plate (46) that divides the pipe (30) vertically is provided at a height position between the refrigerant inlet (32) and the refrigerant outlet (33) in the pipe (30). . The partition plate (46) is inserted into the pipe (30) from the outside through a slit (47) formed in the peripheral wall of the pipe (30), and is brazed to the pipe (30). The partition plate (46) is formed with a through hole (48) in most parts except for the outer peripheral edge thereof, and the portion around the partition plate (46) is the refrigerant flow on the peripheral wall of the cylindrical body (26). An annular portion (49) is provided between the inlet (32) and the refrigerant outlet (33) and projects inwardly.

  Since the upper end of the pipe (30) is brazed, a female screw (38) is provided on the upper part of the inner peripheral surface of the screw part (31), and the female screw (38) on the inner peripheral surface of the female screw part (31) is provided. A cylindrical female-side sealing surface (39) is provided in the lower portion. The internal diameter of the female seal surface (39) of the female thread component (31) is slightly smaller than the internal diameter of the internal thread (38).

  On the outer peripheral surface of the plug (28), a male screw (41) to be screwed with the female screw (38) of the female screw component (31) is provided, and a cylindrical surface-like part is provided below the male screw (41). A male sealing surface (42) is provided. The plug (28) is formed with a wrench hole (43) into which a rod-shaped wrench such as a hexagon wrench or a Torx wrench is inserted so as to extend downward from the upper end surface thereof. The outer diameter of the male side sealing surface (42) of the plug (28) is slightly smaller than the outer diameter of the male screw (41). An annular groove (44) for mounting an O-ring is formed on the outer peripheral surface of the male seal surface (42) of the plug (28), and an O-ring (45) is mounted in the annular groove (44). The O-ring (45) seals between the female sealing surface (39) of the female thread part (31) of the cylindrical body (26) and the male sealing surface (42) of the plug (28). . In addition, an outward flange (28a) that contacts the upper end surface of the female thread component (31) is provided at the upper end portion of the plug (28).

  The desiccant unit (10) includes an upper frame portion (51) disposed between the plug (28) and the annular portion (49), and an upper frame portion (52) integrally formed with the lower cap (27). And a lower frame portion (52) arranged between the annular portion and the frame (50). A bag-like desiccant container (53) formed of a material having air permeability and liquid permeability, for example, a synthetic resin nonwoven fabric and containing a desiccant (54), is disposed in the upper frame portion (51). ing. A bottomed cylindrical strainer (55) having an upper end opened and a lower end closed is disposed in the lower frame portion (52).

  The upper frame portion (51) includes a ring-shaped lower frame member (56), and a plurality of vertical frame members (here, two vertical frame members (56) extending in the circumferential direction and spaced apart from each other in the circumferential direction. 57), an upper frame member (58) for connecting the upper ends of the vertical frame members (57), and a plate-like upper protruding piece (59) integrally formed on the upper frame member (58) so as to protrude upward And more. The desiccant container (53) is placed on the lower frame member (56) between the vertical frame members (57). The lower frame part (52) is formed integrally with the lower frame member (56) of the upper frame part (51) so as to protrude downward and is passed through the through hole (48) of the partition plate (46) and A short cylindrical upper frame member (61) open at both ends, a plurality of vertical frame members (62) extending in the vertical direction and spaced apart from each other in the circumferential direction on the upper frame member (61), and an upper end opened In addition, the lower frame member 63 has a bottomed short cylindrical shape whose lower end is closed and which connects the lower ends of the vertical frame members 62. The strainer (55) has an upper end fixed to the upper frame member (61) and a lower end placed on the lower frame member (63).

  A space between the upper frame portion (51) of the desiccant unit (10) and the annular portion (49) of the partition plate (46) is sealed by an O-ring (64) (seal member). The upper surface (surface facing the plug (28) side) of the annular portion (49) and the lower surface (surface facing the annular portion (49) side) of the lower frame member (56) of the upper frame portion (51) are respectively sealing surfaces. (65) and (66), and an O-ring (64) is disposed between the seal surfaces (65) and (66). Then, the upper projecting piece (59) of the upper frame portion (51) of the frame (50) is pressed downward by the lower end surface of the plug (28), whereby the lower frame member (56) of the upper frame portion (51). Is pressed against the annular portion (49) of the partition plate (46) through the O-ring (64), whereby the sealing surface (65) of the annular portion (49) and the lower frame member (56) of the upper frame portion (51). ) Is sealed to the sealing surface (66).

  The heat exchanger (1) constitutes a refrigeration cycle together with a compressor, an expansion valve (decompressor) and an evaporator, and is mounted on a vehicle as a car air conditioner.

  In the heat exchanger (1) described above, during operation of the refrigeration cycle, the high-temperature and high-pressure gas-liquid mixed phase refrigerant compressed by the compressor passes through the inlet member (24) from the refrigerant inlet (not shown) to the condenser (12). It flows into the upper header portion (15a) of the right header (15). The gas-liquid mixed phase refrigerant that has flowed into the upper header portion (15a) of the right header (15) passes through the heat exchange pipe (4) of the upper end passage group (21), and the upper header portion (14a) of the left header (14). ) And then into the lower header section (15b) of the right header (15) through the heat exchange pipe (4) of the intermediate path group (22) and further heat exchange of the lower end path group (23). It flows into the lower header part (14b) of the left header (14) through the pipe (4).

  The gas-liquid mixed phase refrigerant that has flowed into the lower header portion (14b) of the left header (14) of the condensing portion (12) is sent out from the refrigerant outlet (35) and is supplied to the refrigerant inlet passage (34) of the mounting member (8). And flows from the refrigerant inflow port (32) into a portion above the partition plate (46) in the liquid receiver (7). When the gas-liquid mixed phase refrigerant flows into the receiver (7) above the partition plate (46), moisture is absorbed by the desiccant (54) in the desiccant container (53) of the desiccant unit (10). Is removed and gas-liquid separation is performed. The gas-phase refrigerant accumulates in the upper part of the receiver (7), and the liquid-phase refrigerant passes through the lower frame member (56) of the upper frame part (51) and the upper frame member (61) of the lower frame part (52). After flowing into the portion below the partition plate (46) in the liquid receiver (7) and passing through the strainer (55), the refrigerant outlet (33) through the refrigerant outlet (33) of the mounting member (8) 36) through the refrigerant inlet (37) and into the left header (16) of the supercooling section (13). The refrigerant flowing into the left header (16) of the supercooling section (13) flows into the right header (17) through the heat exchange pipe (4), and passes through the refrigerant outlet member (25) from the refrigerant outlet (not shown). It is sent to the evaporator through an expansion valve. And the short circuit between the refrigerant inlet (32) and the refrigerant outlet (33) of the liquid receiver (7) is prevented by the action of the O-ring (64).

  4 to 7 show modifications of the plug and desiccant unit frame.

  4 to 6, the diameter of the plug (28), which is screwed onto the female thread component (31) of the cylindrical body (26) of the liquid receiver (7), is reduced toward the upper side (back). A tapered hole (70) is formed.

  On the upper end of the vertical frame member (57) of the upper frame portion (51) in the frame (50) of the desiccant unit (10), a cylindrical upper frame member (71) with upper and lower ends opened is integrally formed, A columnar closing member (72) made of synthetic resin is screwed into the upper frame member (71). A female screw (73) is provided on the inner peripheral surface of the upper frame member (71), and a male screw (74) is screwed onto the outer peripheral surface of the closing member (72) with the female screw (73) of the upper frame member (71). ) Is provided. A rod-like upper protrusion (75) is integrally formed at the center of the upper surface of the closing member (72), and has a small diameter toward the upper end (tip) at the upper end of the upper protrusion (75) and a plug ( A tapered portion (76) to be fitted into the tapered hole (70) of 28) is integrally formed. The taper angle (X) before being fitted into the taper hole (70) of the taper portion (76) of the upper frame portion (51) in the frame (50) of the desiccant unit (10) is the taper of the plug (28). The taper angle (Y) of the hole (70) is larger (see FIG. 6).

  Further, a skirt-like seal member (77) extending outwardly downward is entirely formed on the lower surface of the lower frame member (56) of the upper frame portion (51) in the frame (50) of the desiccant unit (10). It is formed over the circumference. Then, the taper portion (76) of the upper frame portion (51) of the frame (50) is pressed downward by the inner peripheral surface of the taper hole (70) of the plug (28), whereby the upper frame portion (51) The lower frame member (56) is pressed against the annular portion (49) of the partition plate (46) through the seal member (77), whereby the sealing surface (65) of the annular portion (49) and the upper frame portion (51) The space between the lower frame member (56) and the sealing surface (66) is sealed.

  Here, the upper frame portion (51) of the frame (50) of the desiccant unit (10), the pipe (30) and the female thread component (31) of the cylindrical body (26) of the liquid receiver (7), the plug ( When there is no dimensional error in 28) etc., as shown in FIG. 4, the tapered portion (76) is closely fitted in the tapered hole (70), and the sealing surface (65) of the annular portion (49) and the upper frame The space between the lower frame member (56) of the part (51) and the sealing surface (66) is securely sealed by the sealing member (77).

  By the way, the upper frame portion (51) of the frame (50) of the desiccant unit (10), the pipe (30) and the female thread component (31) of the cylindrical body (26) of the liquid receiver (7), the plug (28 ) May have some dimensional errors. Even in this case, the taper angle (X) before being fitted into the taper hole (70) of the taper portion (76) is larger than the taper angle (Y) of the taper hole (70) of the plug (28). When it is larger, as shown in FIG. 7, even if the taper portion (76) cannot be closely fitted in the taper hole (70), the taper portion (76) is not in the taper hole (70). It is pushed downward by the inner peripheral surface, and as a result, the upper frame portion (51) can be reliably pushed downward by the plug (28). Therefore, a decrease in sealing performance due to the seal member (77) between the seal surface (65) of the annular portion (49) and the seal surface (66) of the lower frame member (56) of the upper frame portion (51) is prevented. The

  In the above embodiment, the plug (28) is screwed into the upper end opening of the cylindrical body (26), but may be screwed into the lower end opening. In this case, the lower surface of the annular portion (49) facing the plug (28) is used as a sealing surface, and the annular portion is annularly attached to the upper end portion of the lower frame portion (52) in the frame (50) of the desiccant unit (10). A seal surface facing the portion (49) side (upper side) is provided, and the space between both seal surfaces is sealed by a seal member. For example, an outward flange is formed on the upper frame member (61) of the lower frame portion (52), and the upper surface of the outward flange serves as a seal surface.

It is a front view which shows the whole structure of the heat exchanger of this invention. It is the vertical longitudinal cross-sectional view which abbreviate | omitted and showed the part which expanded and showed the part of the liquid receiver of the heat exchanger shown in FIG. It is the disassembled perspective view which abbreviate | omitted and shown the part of the liquid receiver of the heat exchanger shown in FIG. It is a figure equivalent to FIG. 2 which shows the modification of the flame | frame of a plug and a desiccant unit. It is the perspective view which abbreviate | omitted one part which shows the flame | frame of the desiccant unit of FIG. FIG. 5 is a partially enlarged vertical sectional view showing a state before the plug shown in FIG. 4 is completely screwed into a female screw component in a cylindrical main body of a liquid receiver. FIG. 7 is a partially enlarged vertical sectional view showing a state different from that of FIG. 4 after the plug shown in FIG. 6 is completely screwed into a female thread component in a cylindrical main body of the liquid receiver.

Explanation of symbols

(1): Heat exchanger
(2) (3): Tank
(4): Heat exchange pipe
(5): Corrugated fin
(7): Receiver
(9): Partition wall
(10): Desiccant unit
(11): Partition wall
(12): Condensing part
(13): Supercooling section
(14): Condenser left header
(15): Condenser right header
(16): Supercooler left header
(17): Supercooler right header
(26): Cylindrical body
(28): Plug
(32): Refrigerant inlet
(33): Refrigerant outlet
(49): Annular part
(50): Frame
(51): Upper frame part
(64): O-ring (seal member)
(65) (66): Seal surface
(70): Tapered hole
(76): Tapered part
(77): Seal member

Claims (9)

A pair of tanks extending in the vertical direction spaced apart from each other, and a plurality of heat exchange tubes arranged in parallel with a space in the vertical direction between both tanks and having both ends connected to both tanks. And a fin disposed between adjacent heat exchange tubes, a liquid receiver attached to one of the tanks, and a desiccant unit disposed in the liquid receiver and having a desiccant, The liquid receiver has a cylindrical main body extending in the vertical direction and having at least one end opened, and a plug attached to the opening end of the cylindrical main body. The liquid receiver receives the refrigerant from the tank into the liquid receiver. In the heat exchanger in which the refrigerant inlet for sending the refrigerant and the refrigerant outlet for sending the refrigerant from the liquid receiver to the tank are formed so that the former is located above,
An annular portion projecting inward is provided at a height position between the refrigerant inlet and the refrigerant outlet on the peripheral wall of the cylindrical body of the liquid receiver, and the desiccant unit is disposed between the annular portion and the plug. A surface of the annular portion facing the plug side and a surface of the frame portion facing the annular portion side become a sealing surface, and a sealing member is disposed between both the sealing surfaces. A heat exchanger in which a gap between a sealing surface of the annular portion and a sealing surface of the frame portion is sealed by a sealing member when the frame portion of the unit is pressed toward the annular portion by a plug. The heat exchanger according to claim 1, wherein the seal member is an O-ring. The heat exchanger according to claim 1, wherein the seal member is formed integrally with a frame portion of the desiccant unit. 4. The heat exchanger according to claim 3, wherein the frame portion of the desiccant unit is made of a synthetic resin, and the seal member is formed of a skirt-like portion that is integrally formed with the frame portion and extends outward toward the annular portion. One of the ends of the frame part of the plug and desiccant unit is formed with a tapered hole with a small diameter toward the back, and the other with a synthetic resin that has a small diameter toward the tip and fits into the tapered hole. The heat exchanger according to claim 1, wherein a taper angle of the taper portion is larger than a taper angle of the taper hole. The heat exchanger according to claim 5, wherein the plug has a tapered hole, and a taper portion is formed in the frame portion of the desiccant unit. A partition plate is fixed to the tubular body of the liquid receiver at a height position of a portion between the refrigerant inlet and the refrigerant outlet on the peripheral wall of the tubular body of the receiver, and a through hole is formed at the center of the partition plate. The heat exchanger according to any one of claims 1 to 6, wherein a portion around the through hole in the partition plate is a tubular portion. The heat exchanger according to any one of claims 1 to 7, wherein a strainer is formed integrally with the desiccant unit. Both tanks are partitioned into two headers arranged in the vertical direction by a partition wall at the same height position, and a condensing part having a function as a condenser is provided in a portion above both partition walls. A supercooling section having a function as a supercooler is provided in a portion below the partition wall, and the refrigerant flowing out of the header on the tank side to which the condenser receiver is attached is received through the refrigerant inlet. The refrigerant that enters the liquid container and flows out from the refrigerant outlet of the tubular main body of the liquid receiver flows into a header on the tank side to which the liquid receiver of the supercooling unit is attached. The heat exchanger according to any one of 8.

Images