JP4774238B2 - Refrigeration cycle refrigerant distribution part connection structure - Google Patents

Description

The present invention relates to a refrigerant circulation part connection structure of a refrigeration cycle, and more specifically, in a supercritical refrigeration cycle in which a supercritical refrigerant such as CO ₂ (carbon dioxide) is used, between pipes constituting a pipe, and a refrigerant circulation part It is related with the connection structure which connects the pipe which comprises piping, and a refrigerant | coolant distribution | circulation part.

  In this specification and claims, the term “refrigerant circulation part” includes a refrigeration cycle in addition to the refrigerant circulating in the equipment constituting the refrigeration cycle, such as a header of a heat exchanger. It includes pipes for piping.

  As a gas cooler used in a supercritical refrigeration cycle, a pair of header tanks arranged at intervals from each other, and arranged in parallel with an interval between both header tanks, both ends are connected to both header tanks. There is a connection block comprising a heat exchange pipe and fins disposed in a ventilation gap between adjacent heat exchange pipes and brazed to the heat exchange pipe, and a pipe pipe extending from the compressor is connected to one header tank. It is known that a connection block to which a pipe for piping extending from an expansion valve is connected to the other header tank is attached (see Patent Document 1 and FIG. 1).

  In the gas cooler described in Patent Document 1, a flow path leading to the inside of the header tank via a pipe is formed at one end of each connection block, and a female screw hole is formed at the other end. And although not indicated in patent documents 1, a pipe for piping is connected to a gas cooler side connection block by the following pipe connection structure. That is, a pipe-side connection block having the same shape and the same size as the gas cooler-side connection block, a flow path formed at one end, and a bolt insertion hole formed at the other end is prepared. A male pipe portion to be inserted into an end portion of the flow path of the gas cooler side connection block is formed around one end opening of the flow path in the pipe side connection block. Further, the end of the pipe for piping is inserted into the end opposite to the side where the male pipe is formed in the flow path of the pipe side connection block, and is fixed by welding. Then, with both flow paths matched and the male pipe portion of the pipe side connection block inserted into the flow path of the gas cooler side connection block, the bolt passed through the bolt insertion hole is inserted into the female screw hole of the gas cooler side connection block. By fitting with screws, both connection blocks are fixed and piping pipes are connected.

  However, the pipe connection structure in the gas cooler described in Patent Document 1 has the following problems.

  That is, in the supercritical refrigeration cycle, the operating pressure is about 10 times as high as that of the refrigeration cycle using the chlorofluorocarbon refrigerant. However, according to the pipe connection structure in the gas cooler described in Patent Document 1, both connections Since the flow path is formed at one end of the block and is fixed by a bolt at the other end, the fixing strength is insufficient and the pressure resistance is insufficient. As a result, the one end portions of both connection blocks are separated from each other, and the male pipe portion of the pipe-side connection block may slightly come out from the flow path of the gas cooler-side connection block, and the refrigerant may leak.

In order to solve such a problem, the length of both connection blocks may be increased, the flow path may be formed at the center in the length direction, and fixed with bolts at both ends. As the number increases, workability at the time of connection decreases.
JP-A-11-351788

  An object of the present invention is to solve the above problems and provide a refrigerant circulation part connection structure of a refrigeration cycle with improved pressure resistance.

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

1) A flow path member having a refrigerant flow path that communicates with the refrigerant circulation section through one end opening, and a flow path member connected to the flow path member in a state where the tip end portion is fitted in the other end opening of the refrigerant flow path of the flow path member. A pipe as a refrigerant circulation part, a fixing member that fixes the pipe to the flow path member, and a fastening means that fixes the flow path member and the fixing member, and one of the flow path member and the fixing member In addition, an engaging portion that engages with the other part of the pipe to prevent separation between the flow path member and the fixing member is provided , and an annular ridge is formed over the entire circumference near the tip of the pipe. A portion on the front end side of the ridge is fitted into the other end opening of the refrigerant flow path of the flow path member, the fixed member opens at one side edge thereof, and the refrigerant is sandwiched between the annular ridges in the pipe. A notch into which the part opposite to the fitting part into the flow path fits is formed, A pipe whose end is fitted into the other end opening of the refrigerant flow path of the flow path member is fitted into the notch of the fixed member from the side, so that either the flow path member or the fixed member A refrigerant circulation part connection structure of a refrigeration cycle, wherein an engaging part provided on one side is engaged with a part of the other side.

2) Protruding portions are provided on the end portion of the flow path member on the side where the refrigerant flow path is formed and projecting toward the fixing member side and along the end surface of the fixing member, and on the surface facing the end surface side of the fixing member in the protruding portion, A concave groove extending in the depth direction of the notch of the fixing member is formed, and an outwardly protruding convex portion that fits into the concave groove is provided on the end surface of the fixing member, and the side wall on the distal end side of the protruding portion in the concave groove is The refrigerant circulation part connection structure of the refrigeration cycle according to the above 1), which is an engaging part that engages with a convex part.

3) The above-mentioned 1), wherein the end of the flow path member side pipe, which is the refrigerant flow section, is fitted into the one end opening of the refrigerant flow path of the flow path member, and the flow path member side pipe is joined to the flow path member. Or the refrigerant | coolant distribution part connection structure of the refrigerating cycle of 2) description.

4) A first flow path member having a refrigerant flow path communicating with the refrigerant flow section at one end and a female thread hole formed at the other end, and a refrigerant flow path communicating with the refrigerant flow section at one end are formed. A second passage member having a bolt insertion hole formed at the other end, and a bolt that is passed through the bolt insertion hole of the second passage member and screwed into the female screw hole of the first passage member. To prepare,
In the first flow path member, the end of the refrigerant flow path on the side where the refrigerant flow path is formed is provided with a protrusion that protrudes toward the second flow path member and extends along the end surface of the second flow path member. Forming a concave groove extending in the width direction of both flow path members on the surface facing the end face side of the second flow path member, and further providing a convex portion projecting outward to fit in the concave groove on the end face of the second flow path member;
At the end of the first flow path member on the second flow path member side in the refrigerant flow path, an insertion portion having an inner peripheral surface formed into a cylindrical surface is formed, and the first flow path member side of the second flow path member A peripheral portion of the opening of the refrigerant flow path on the surface facing the surface is provided with a male pipe portion whose outer peripheral surface is cylindrical and inserted into the insertion portion of the refrigerant flow path of the first flow path member;
The male pipe portion of the second flow path member is inserted into the insertion portion of the refrigerant flow path of the first flow path member so that the female thread hole of the first flow path member and the bolt insertion hole of the second flow path member are displaced. ,
By rotating the second flow path member around the center line of the male pipe portion with respect to the first flow path member, the female screw hole and the bolt insertion hole are matched, and the convex portion is fitted in the concave groove. Engaging the side wall of the projecting portion tip side of the concave groove with the convex portion,
And the refrigerant | coolant distribution | circulation part connection method of a refrigerating cycle including screw-fitting in the internal thread hole of a 1st flow path member through a volt | bolt in the bolt insertion hole of a 2nd flow path member.

5) A first flow path member having a refrigerant flow path communicating with the refrigerant circulation section at one end and a bolt insertion hole formed at the other end, and a refrigerant flow path communicating with the refrigerant circulation section at one end. A second flow path member having a female screw hole formed at the other end, and a bolt that is passed through the bolt insertion hole of the first flow path member and screwed into the female screw hole of the second flow path member. To prepare,
In the first flow path member, the end of the refrigerant flow path on the side where the refrigerant flow path is formed is provided with a protrusion that protrudes toward the second flow path member and extends along the end surface of the second flow path member. Forming a concave groove extending in the width direction of both flow path members on the surface facing the end face side of the second flow path member, and further providing a convex portion projecting outward to fit in the concave groove on the end face of the second flow path member;
At the end of the second flow path member on the first flow path member side in the refrigerant flow path, an insertion portion whose inner peripheral surface is formed into a cylindrical surface is formed, and the second flow path member side of the first flow path member A peripheral portion of the opening of the refrigerant flow path on the surface facing the surface is provided with a male pipe portion whose outer peripheral surface is cylindrical and inserted into the insertion portion of the refrigerant flow path of the second flow path member;
The male pipe portion of the first flow path member is inserted into the insertion portion of the refrigerant flow path of the second flow path member so that the female screw hole of the second flow path member and the bolt insertion hole of the first flow path member are displaced. ,
By rotating the first flow path member around the center line of the male pipe portion with respect to the second flow path member, the female screw hole and the bolt insertion hole are matched, and the convex portion is fitted in the concave groove. Engaging the side wall of the projecting portion tip side of the concave groove with the convex portion,
And the refrigerant | coolant distribution | circulation part connection method of a refrigerating cycle including screw-fitting in the internal thread hole of a 2nd flow path member through a volt | bolt in the bolt insertion hole of a 1st flow path member.

According to the refrigerant flow part connection structure of 1) above, the engagement part that engages with one of the flow path member and the fixed member and prevents a separation between the flow path member and the fixed member Therefore, the fixing strength between the flow path member and the fixing member is increased, and the pressure resistance is improved. Therefore, even when the operating pressure of the refrigeration cycle becomes high, the flow path member and the fixing member are not separated from each other, and as a result, the leakage of the refrigerant due to the disconnection of the pipe and the disconnection of the pipe is prevented. Moreover, since the fixing strength between the channel member and the fixing member is increased, thereby improving the vibration resistance and the like.

In addition, according to the refrigerant circulation part connection structure of 1), the workability when engaging the engaging part provided on one of the flow path member and the fixing member with the other part is improved .

According to refrigerant flow section connection structure of the two), workability in engaging the engagement portion provided on either one of the flow channel member and the fixing member in the other of the portions is improved.

According to the refrigerant circulation part connection method of 4) and 5) above , the refrigerant circulation parts can be connected relatively easily, and in the obtained refrigerant circulation part connection structure, the two flow path members are fixed to each other. Strength increases and pressure resistance improves. Therefore, even when the operating pressure of the refrigeration cycle increases, the two flow path members are not separated from each other, and as a result, leakage of the refrigerant from between the two flow path members is prevented. In addition, since the fixing strength between the two flow path members is increased, the vibration durability and the like are also improved.

  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.

  Moreover, in description of Embodiment 1-3, the upper and lower sides and right and left of FIG.1, FIG.2, FIG.12 and FIG. Further, the downstream side of the air flowing in the ventilation gap between adjacent heat exchange tubes (the direction indicated by the arrow X in FIGS. 1 and 12) is referred to as the front, and the opposite side is referred to as the rear.

Embodiment 1
This embodiment is shown in FIGS. 1-9, and this invention is applied to the gas cooler of a supercritical refrigeration cycle.

1 and 2, a gas cooler (1) of a supercritical refrigeration cycle that uses a supercritical refrigerant, for example, CO ₂ , is arranged with two header tanks (2) (2) that are spaced apart in the left-right direction and extend in the up-down direction. 3) and a plurality of flat heat exchange tubes (4) arranged in parallel with a space in the vertical direction between the header tanks (2) and (3), and adjacent heat exchange tubes (4) Between the upper and lower ends of the heat exchange pipe (4) and the corrugated fins (5) brazed to the heat exchange pipe (4) and the upper and lower ends of the corrugated fins (5) And a side plate (6) made of an aluminum bare material brazed to the corrugated fin (5). In this embodiment, the right header tank (2) is referred to as a first header tank, and the left header tank (3) is referred to as a second header tank.

  As shown in FIGS. 3 and 4, the first header tank (2) includes a brazing sheet having a brazing material layer on both sides, here a header forming plate (7) formed from an aluminum brazing sheet, and brazing on both sides. A brazing sheet having a material layer, here a pipe connection plate (8) formed from an aluminum brazing sheet, and a metal bare material, here an aluminum bear material and a header forming plate (7) and a pipe connection plate ( The intermediate plate (9) interposed between them is laminated and brazed to each other.

  The header forming plate (7) extends in the vertical direction and has a plurality of equal bulging heights, lengths and widths, here two outward bulging portions (11A) and (11B) spaced apart in the vertical direction. Formed. The opening facing the left side of each outward bulge portion (11A) (11B) is closed by the intermediate plate (9). The header forming plate (7) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides. A refrigerant inlet (12) is formed at the top of the upper outer bulge (11A) of the header forming plate (7), and a refrigerant outlet (13) is formed at the top of the lower outer bulge (11B). ing.

  A plurality of through-tube insertion holes (14) that are long in the front-rear direction are formed in the pipe connection plate (8) at intervals in the vertical direction. The plurality of tube insertion holes (14) in the upper half are formed in the vertical range of the upper outer bulge portion (11A) of the header forming plate (7), and the plurality of tube insertion holes in the lower half are also formed. The hole (14) is formed within the vertical range of the lower outward bulge portion (11B). The length in the front-rear direction of the tube insertion hole (14) is slightly longer than the width in the front-rear direction of each outward bulge (11A) (11B). It protrudes outward from the front and rear side edges of the side bulging portions (11A) and (11B) (see FIG. 5). It protrudes to the right and left side edges of the pipe connection plate (8) to the right, the tip reaches the outer surface of the header forming plate (7), and the header forming plate (7) and the intermediate plate (9) A covering wall (15) covering the entire length of the boundary portion is integrally formed and brazed to both the front and rear side surfaces of the header forming plate (7) and the intermediate plate (9). A plurality of engaging portions (16) that engage with the outer surface of the header forming plate (7) are integrally formed at the protruding end of each covering wall (15) at intervals in the vertical direction. It is brazed to (7). The pipe connection plate (8) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  A through-hole communication hole (9) that allows the pipe insertion hole (14) of the pipe connection plate (8) to communicate with the intermediate plate (9) into the outward bulges (11A) (11B) of the header forming plate (7). 17) is formed in the same number as the tube insertion hole (14). The communication hole (17) is slightly larger than the pipe insertion hole (14) (see FIG. 5). Each communication hole (17) is formed at a position corresponding to each tube insertion hole (14) of the tube connection plate (8). The plurality of tube insertion holes (14) in the upper half of the pipe connection plate (8) are connected to the upper outer bulge portion via the plurality of communication holes (17) in the upper half of the intermediate plate (9). (11A), the plurality of tube insertion holes (14) in the lower half are also expanded outwardly through the plurality of communication holes (17) in the lower half of the intermediate plate (9). Part (11B) is connected. All the communication holes (17) that communicate with the upper outer bulge (11A) and all the communication holes (17) that communicate with the lower outer bulge (11B) are respectively in the intermediate plate (9). It is connected by the communication part (18) formed by excising the part between adjacent communication holes (17). The intermediate plate (9) is formed by pressing an aluminum bare material.

  The second header tank (3) has substantially the same configuration as the first header tank (2), and the same components and the same parts are denoted by the same reference numerals (see FIG. 6). Both header tanks (2) and (3) are arranged so that the pipe connection plates (8) face each other. The difference between the second header tank (3) and the first header tank (2) is that the header forming plate (7) has an outward bulging portion (11A) (11B) of the first header tank (2). A plate for header formation so that one outer bulge (19), which is one less than the number, extends over both outer bulges (11A) (11B) of the first header tank (2). The point formed from the upper end to the lower end of (7), the point where the refrigerant inlet and the refrigerant outlet are not formed in the outward bulging part (19), and all the pipe insertion holes of the pipe connecting plate (8) (14) leads to the outward bulge (19) through all the communication holes (17) of the intermediate plate (9), as well as all the communication holes (17) of the intermediate plate (9). The point of being connected by the communication part (18) formed by excising the part between adjacent communication holes (17).

  Both header tanks (2) and (3) are composed of a header forming plate (7) having outward bulging portions (11A), (11B) and (19), a tube insertion hole (14), a covering wall (15) and a covering. A pipe connecting plate (8) having a projecting piece (16A) (see solid lines in FIGS. 4 and 6) straightly connected to the wall (15), a communication hole (17) and a communication part (18) After forming the intermediate plate (9) having three, the three plates (7), (8) and (9) are combined in a laminated form, and then the protrusion (16A) is bent to engage the header forming plate (7). Then, the engaging portion (16) is formed, and then the three plates (7) (8) are formed by using the brazing material layer of the header forming plate (7) and the brazing material layer of the pipe connecting plate (8). (9) is brazed to each other, the covering wall (15) is brazed to both the front and rear side surfaces of the intermediate plate (9) and the header forming plate (7), and the engaging portion (16) is further formed for the header Manufactured by brazing the plate (7).

  The heat exchange pipe (4) is made of an extruded shape made of metal, here aluminum, and has a wide and flat shape in the front-rear direction, and a plurality of refrigerant passages (4a) extending in the length direction are formed in parallel in the inside. ing. Both ends of the heat exchange pipe (4) are inserted into the pipe insertion holes (14) of both header tanks (2) and (3), and the brazing material layer of the pipe connection plate (8) is used. It is brazed to the pipe connection plate (8). Note that both ends of the heat exchange pipe (4) enter the communication hole (17) up to the middle part in the thickness direction of the intermediate plate (9) (see FIG. 2). The right end of the heat exchange pipes (4) in the upper half is connected to the first header tank (2) so as to communicate with the upper outer bulge (11A), and the left end is connected to the outer bulge (19 ) Is connected to the second header tank (3) so as to communicate with the inside. In addition, the right end of the heat exchange pipes (4) in the lower half is connected to the first header tank (2) so as to communicate with the lower outer bulge (11B), and the left end is bulged outward. It is connected to the second header tank (3) so as to communicate with the part (19).

  The corrugated fin (5) is formed in a wavy shape using a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet.

  In the gas cooler (1) described above, the upper half of the first header tank (2) including the upper outer bulge portion (11A) serves as the refrigerant inlet header (21), which is the refrigerant circulation portion, and also the lower outer bulge. The lower half including the outlet (11B) serves as a refrigerant outlet header (22) which is a refrigerant circulation part. Also, a refrigerant circulation path through which the refrigerant inlet header (21) and the refrigerant outlet header (22) are connected is formed by all the heat exchange pipes (4) and the second header tank (3).

  Then, a pipe for pipe (25) on the inlet side and the outlet side is connected to the refrigerant inlet header (21) and the refrigerant outlet header (22), respectively, by a refrigerant circulation part connection structure (23). Both refrigerant circulation part connection structures (23) have the same configuration, and only the refrigerant circulation part connection structure (23) for connecting the outlet side piping pipe (25) is illustrated in detail.

  As shown in FIGS. 7-9, the refrigerant | coolant circulation part connection structure (23) is joined to the outer surface of the lower outward bulge part (11B) of the first header tank (2), that is, the refrigerant outlet header (22). A flow path member (26), a pipe for pipe (25), a fixing member (27) for fixing the pipe for pipe (25) to the flow path member (26), a flow path member (26) and a fixing member ( 27) and fastening means for fixing.

  The flow path member (26) is formed of a metal, here an aluminum bare material, into a vertically rectangular block shape when viewed from the rear, and one end opening is formed into a refrigerant through the refrigerant inlet (12) and the refrigerant outlet (13). The refrigerant has a refrigerant flow path (28) that communicates with the inlet header (21) and the refrigerant outlet header (22) and has the other end opened at the upper end of the rear surface of the flow path member (26). An insertion portion (28a) having an inner peripheral surface of a cylindrical surface is formed at the rear end portion of the refrigerant flow path (28). The upper end surface of the flow path member (26) is integrally formed with a protrusion (29) that protrudes rearward from the rear surface of the flow path member (26) and extends along the upper end surface of the fixing member (27). A concave groove (31) extending in the left-right direction is formed on the lower surface of the substrate. The left and right ends of the groove (31) are open on the left and right sides of the protrusion (29). A side wall on the distal end side of the projecting portion (29) in the concave groove (31) serves as an engaging portion (32) that engages with a convex portion (35) of the fixing member (27) described later. The flow path member (26) is brazed to the refrigerant inlet header (21) and the refrigerant outlet header (22) using the brazing material on the outer surface of the header forming plate (7).

  An annular bead (25a) (annular ridge) is formed over the entire circumference at a portion near the tip of the piping pipe (25). An O-ring (33) is attached to the outer peripheral surface of the pipe pipe (25) at the tip side of the annular bead (25a).

  The fixing member (27) is formed of a metal, here an aluminum bear material, in the shape of an oblong block as viewed from the rear. The upper end portion of the fixing member (27) is open to the left edge (left side surface) of the fixing member (27) and the rear portion (the inner portion in the length direction) of the pipe for pipe (25) from the annular bead (25a) is fitted. A notch (34) is formed. A recess (27a) into which the annular bead (25a) of the pipe for piping (25) is fitted is formed on the peripheral edge of the front end opening of the notch (34) on the front surface of the fixing member (27). On the upper end surface of the fixing member (27), a convex portion (35) protruding upward and fitting into the concave groove (31) of the flow path member (26) is integrally formed. The protruding height of the convex portion (35) is equal to the depth of the concave groove (31), and the length of the convex portion (35) in the front-rear direction is equal to the width of the concave groove (31) in the front-rear direction. Further, the upper surface of the convex portion (35) has an arc shape protruding upward as viewed from the rear.

  The fastening means is formed so as to extend forward from the lower end of the rear surface of the flow path member (26), so that a screw hole (36) and a bolt inserted in the lower end of the fixing member (27) are formed penetrating in the front-rear direction. It comprises a bolt (38) that is passed through the hole (37) from the front and is screwed into the female screw hole (36) of the flow path member (26).

  The piping pipe (25) is connected to the refrigerant inlet header (21) and the refrigerant outlet header (22) as follows.

  First, a portion of the pipe pipe (25) on the tip side of the annular bead (25a) is inserted into the insertion portion (28a) of the refrigerant flow path (28) of the flow path member (26). Next, by arranging the fixing member (27) so as to move from the right side to the left side of the flow path member (26), the convex portion (35) is placed in the concave groove (31) of the flow path member (26). Is inserted into the notch (34) and the rear part of the pipe for pipe (25) from the annular bead (25a) is inserted, and the bolt insertion hole (37) and the female screw hole (36) are aligned with each other. . At this time, the annular bead (25a) of the piping pipe (25) is fitted into the recess (27a) of the fixing member (27). Next, the bolt (38) is passed from the front through the bolt insertion hole (37) of the fixing member (27) and is screwed into the female screw hole (36) of the flow path member (26). Thus, the piping pipe (25) is connected to the refrigerant outlet header (22).

  The gas cooler (1) exchanges heat between the refrigerant coming out of the evaporator and the refrigerant coming out of the evaporator and the refrigerant coming out of the evaporator, the expansion valve as the compressor, the evaporator, the decompressor, the accumulator as the gas-liquid separator, and the gas cooler. A supercritical refrigeration cycle is configured together with the intermediate heat exchanger to be mounted on a vehicle such as an automobile as a car air conditioner.

In the gas cooler (1) described above, CO ₂ that has passed through the compressor passes from the inlet pipe (25) through the refrigerant passage (28) of the passage member (26) to the refrigerant inlet (12). The refrigerant flows into the refrigerant passages (4a) of all the heat exchange pipes (4) that enter the header (21), diverge, and communicate with the upper outer bulge portion (11A). The CO ₂ flowing into the refrigerant passage (4a) flows leftward in the refrigerant passage (4a) and then flows into the outward bulging portion (19) of the second header tank (3). The CO ₂ that has flowed into the outward bulge (19) flows downward through the communication hole (17) and the communication portion (18) with the inside thereof, and is divided into the lower outward bulge (11B). The refrigerant flows into the refrigerant passages (4a) of all the heat exchange pipes (4) communicated, changes the flow direction, flows right in the refrigerant passages (4a), and enters the refrigerant outlet header (22). Thereafter, CO ₂ passes through the refrigerant outlet (13) and the refrigerant flow path (28) of the flow path member (26) and is discharged from the outlet side piping pipe (25). Then, while CO ₂ flows in the refrigerant passage (4a) of the heat exchange pipe (4), the ventilation gap is heat-exchanged with the air flowing in the direction indicated by the arrow X in FIG.

  In the first embodiment, the flow path member (26) is provided with the engaging portion (32), and the fixing member (27) is provided with the convex portion (35) with which the engaging portion (32) is engaged. On the other hand, the flow path member (26) may be provided with a convex portion (35), and the fixing member (27) may be provided with an engaging portion (32) that engages with the convex portion (35). Good.

Embodiment 2
This embodiment is shown in FIGS. 10 and 11, and the present invention is applied to a gas cooler of a supercritical refrigeration cycle.

  In the gas cooler of the second embodiment, a refrigerant circulation part connection structure for connecting an inlet side piping pipe to the refrigerant inlet header (21), and a refrigerant circulation part connection structure for connecting an outlet side piping pipe to the refrigerant outlet header (22). However, it differs from the gas cooler of Embodiment 1, and the other structure is the same as the gas cooler of Embodiment 1.

  Both refrigerant circulation part connection structures (40) in Embodiment 2 have the same configuration, and only the refrigerant circulation part connection structure (40) for connecting the outlet side piping pipe is illustrated.

  The refrigerant circulation part connection structure (40) is joined to the outer surfaces of both outwardly bulging parts (11A) and (11B) of the first header tank (2), that is, the refrigerant inlet header (21) and the refrigerant outlet header (22). The first flow path member (41), the second flow path member (42) fixed to the first flow path member (41), and fastening means for fixing both flow path members (41) (42). .

  The first flow path member (41) has the same configuration as the flow path member (26) of the gas cooler of Embodiment 1, and the same reference numerals are given to the same portions.

  The second flow path member (42) is formed of a metal, here an aluminum bear material, in the shape of an oblong block as viewed from the rear. The second flow path member (42) is formed with a refrigerant flow path (43) penetrating in the front-rear direction. A large-diameter portion (43a) is formed at the rear end portion of the refrigerant flow path (43), and a leading end portion of a pipe for piping (44), which is a refrigerant circulation portion, is inserted into the large-diameter portion (43a). And joined to the second flow path member (42) by welding or brazing. A male pipe part (42a) whose outer peripheral surface is formed into a cylindrical surface is integrally formed in a forward projecting manner at the peripheral edge of the front end opening of the refrigerant flow path (43) on the front surface of the second flow path member (42). ing. An O-ring (45) is attached to the outer peripheral surface of the male pipe portion (42a). On the upper end surface of the second flow path member (42), a convex portion (46) protruding upward and fitting into the concave groove (31) of the first flow path member (41) is integrally formed. The protruding height of the convex portion (46) is equal to the depth of the concave groove (31), and the length of the convex portion (46) in the front-rear direction is equal to the width of the concave groove (31) in the front-rear direction. Further, the upper surface of the convex portion (46) has an arc shape protruding upward as viewed from the rear. Here, the distance between the center line of the outer peripheral surface of the male pipe part (42a) and the upper end of the convex part (46) is the distance between the insertion part (28a) in the refrigerant flow path (28) of the first flow path member (41). It is equal to the distance between the center line and the bottom surface of the groove (31).

  A fastening means is the same structure as the fastening means of the gas cooler of Embodiment 1, and attaches | subjects the same code | symbol to the same thing.

  The piping pipe (44) is connected to the refrigerant inlet header (21) and the refrigerant outlet header (22) as follows.

  First, the male pipe part (42a) of the second flow path member (42) is inserted into the insertion part (28a) of the refrigerant flow path (28) of the first flow path member (41). At this time, the bolt insertion hole (37) of the second flow path member (42) is deviated counterclockwise as viewed from the rear so that the screw insertion hole (36) of the first flow path member (41) is displaced. Keep it like that. Next, by rotating the second flow path member (42) around the center line on the outer peripheral surface of the male pipe portion (42a), the convex portion (46) of the second flow path member (42) is moved to the first flow path. The bolt is inserted into the groove (31) of the member (41), and the bolt insertion hole (37) and the female screw hole (36) are matched. Next, the bolt (38) is passed from the front through the bolt insertion hole (37) of the fixing member (27) and is screwed into the female screw hole (36) of the first flow path member (41). Thus, the outlet side piping pipe (44) is connected to the refrigerant outlet header (22).

  In the second embodiment, the first flow path member (41) is provided with the engaging portion (32), and the second flow path member (42) is engaged with the convex portion (46). Contrary to this, the first flow path member (41) is provided with a convex portion, and the second flow path member (42) is provided with an engaging portion that engages with the convex portion (46). It may be done.

Embodiment 3
This embodiment is shown in FIGS. 12 to 20, and the present invention is applied to an evaporator of a supercritical refrigeration cycle.

12 to 14, an evaporator (50) of a supercritical refrigeration cycle using a supercritical refrigerant, for example, CO ₂ , has two header tanks (51) (51) ( 52) and a plurality of flat heat exchange pipes (53) arranged in parallel in the left-right direction between both header tanks (51) and (52), and adjacent heat exchange pipes (53). Between the left and right heat exchange pipes (53) and the corrugated fins (54) brazed to the heat exchange pipes (53) and the left and right ends of the corrugated fins (54) And an aluminum bear side plate (55) brazed to the corrugated fin (54). In this embodiment, the upper header tank (51) is referred to as a first header tank, and the lower header tank (52) is referred to as a second header tank.

  The first header tank (51) includes a brazing sheet having a brazing material layer on both sides, here a header forming plate (56) formed from an aluminum brazing sheet, and a brazing sheet having a brazing material layer on both sides, here aluminum. The pipe connecting plate (57) formed from the brazing sheet and a metal bare material, here an aluminum bear material, and interposed between the header forming plate (56) and the pipe connecting plate (57) The intermediate plate (58) is laminated and brazed to each other.

  Two outward bulges (59A) (59B) (59C) (59D) extending in the left-right direction on the right and left sides of the header forming plate (56) of the first header tank (51) Are formed at intervals. Hereinafter, in this embodiment, the outer bulging portion (59A) of the right front portion is the first outer bulging portion, the outer bulging portion (59B) of the right rear portion is the second outer bulging portion, and the left side. The outer bulging portion (59C) in the front portion is referred to as a third outer bulging portion, and the outer bulging portion (59D) in the left rear portion is referred to as a fourth outer bulging portion. The openings facing the lower side of the outward bulges (59A) to (59D) are closed by the intermediate plate (58). The bulge height, length, and width of each of the outward bulge portions (59A) to (59D) are equal. The header forming plate (56) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  As shown in FIG. 15, a plurality of penetrating tube insertion holes (61) that are long in the front-rear direction are formed in the front-rear side portions of the pipe connection plate (57) at intervals in the left-right direction. The plurality of tube insertion holes (61) in the right half of the front side are formed in the left-right direction range of the first outward bulge portion (59A) of the header forming plate (56), and the right half of the rear side The plurality of tube insertion holes (61) are formed within the range of the second outer bulge portion (59B) in the left-right direction, and the plurality of tube insertion holes (61) in the front left half are A plurality of tube insertion holes (61) in the left half of the rear bulge (59C) are formed in the lateral direction of the lateral bulge (59C). Is formed. In addition, the length of each tube insertion hole (61) is slightly longer than the width in the front-rear direction of each outward bulge portion (59A) to (59D), and both front and rear end portions of the tube insertion hole (61) are It protrudes outward from the front and rear side edges of the side bulges (59A) to (59D). Projected upward at both front and rear edges of the pipe connection plate (57), leading to the outer surface of the header forming plate (56), and the boundary between the header forming plate (56) and the intermediate plate (58) A covering wall (62) covering the entire length of the portion is integrally formed and brazed to both front and rear side surfaces of the header forming plate (56) and the intermediate plate (58). A plurality of engaging portions (63) that engage with the outer surface of the header forming plate (56) are integrally formed at the protruding end of each covering wall (62) at intervals in the left-right direction. (56) is brazed. The pipe connecting plate (57) is formed by pressing an aluminum brazing sheet having a brazing material layer on both sides.

  A through-hole communication hole that allows the pipe insertion hole (61) of the pipe connection plate (57) to communicate with the intermediate plate (58) into the outward bulges (59A) to (59D) of the header forming plate (56). (64) is formed in the same number as the tube insertion hole (61). The communication hole (64) is slightly larger than the tube insertion hole (61) (see FIG. 17). Each communication hole (64) is formed at a position corresponding to each tube insertion hole (61) of the tube connection plate (57). The plurality of tube insertion holes (61) in the right half of the front side of the pipe connection plate (57) are first through the plurality of communication holes (64) in the right half of the front side of the intermediate plate (58). A plurality of tube insertion holes (61) in the right half of the rear side are also communicated in the outer bulge portion (59A), and a plurality of communication holes in the right half of the rear side of the intermediate plate (58) ( 64) through the second outer bulging portion (59B), and the plurality of tube insertion holes (61) in the left half of the front side are also formed in the left half of the front side of the intermediate plate (58). The plurality of tube insertion holes (61) in the left half of the rear side are connected to the third outer bulge portion (59C) through the plurality of communication holes (64). It is made to communicate in a 4th outward bulge part (59D) via the some communication hole (64) in the left half part of a rear side. All the communication holes (64) communicating with the first outer bulge portion (59A) and all the communication holes (64) communicating with the second outer bulge portion (59B) are respectively formed in the intermediate plate (58). The first communicating portion (66) formed by cutting a portion between the communicating holes (64) adjacent in the left-right direction is communicated. Each communication hole (64) communicating with the third outer bulge portion (59C) and each communication hole (64) communicating with the fourth outer bulge portion (59D) are adjacent to each other in the front-rear direction of the intermediate plate (58). The second communicating portion (65) formed by cutting out the portion between the matching communicating holes (64) is communicated, whereby the second outer bulging portion (59C) and the fourth outer bulging portion are communicated. The part (59D) communicates with each other. The intermediate plate (58) is formed by pressing an aluminum bare material.

  Two right protrusions (56a) (57a) (58a) are formed at the right ends of the three plates (56), (57), and (58) at intervals in the front-rear direction. The intermediate plate (58) is formed with a notch (67) that leads from the tip of the two outward projections (58a) to the communication hole (64) at the right end, thereby the first header tank (51). Further, a refrigerant inlet (68) communicating with the first outer bulging portion (59A) and a refrigerant outlet (69) communicating with the second outer bulging portion (59B) are formed (see FIG. 17). ).

  The second header tank (52) has substantially the same configuration as the first header tank (51), and the same components and the same parts are denoted by the same reference numerals (see FIG. 16). Both header tanks (51) and (52) are arranged so that the pipe connecting plates (57) face each other. The difference between the first header tank (51) in the second header tank (52) is that the header forming plate (56) has two outwardly bulging portions (71A) (71B) spaced in the front-rear direction. Straddles the first outer bulging portion (59A) and the third outer bulging portion (59C), and the second outer bulging portion (59B) and the fourth outer bulging portion (59D), respectively. The header forming plate (56) is formed from the right end portion to the left end portion, and all the communication holes (64) communicating with the outer bulge portions (71A) (71B) are connected to the intermediate plate (58 ) In the left and right direction, the point of being communicated by the communicating part (72) formed by cutting away the part between the communicating holes (64), both outwardly bulging parts (71A) (71B) communicate The point which is not made into a thing and the point which the rightward protrusion part is not formed in the right end part of three plates (56) (57) (58) are the points. The bulge height and width of the outward bulges (71A) (71B) are equal to the bulge height and width of the outward bulges (59A) to (59D) of the first header tank (51). ing.

  Both header tanks (51) and (52) are provided with header forming plates (56) having outward bulges (59A) (59B) (59C) (59D) (71A) (71B) and pipe insertion holes (61 ), A pipe connecting plate (57) having a covering wall (62) and an engaging portion forming protrusion (63A) (see solid lines in FIGS. 15 and 16) straightly connected to the covering wall (62), and a communication hole (64) and the intermediate plate (58) having the communication portions (65), (66), and (72), and then the three plates (56), (57), and (58) are combined in a stack, (63A) is bent to form the engaging portion (63), and then the three plates (56) are utilized using the brazing filler metal layer of the header forming plate (56) and the brazing filler metal layer of the pipe connecting plate (57). (57) and (58) are brazed to each other, and the covering wall (62) is brazed to both the front and rear sides of the intermediate plate (58) and the header forming plate (56), and the engaging portion (63) is It is manufactured by brazing the header forming plate (56).

  The heat exchange pipe (53) is made of an extruded shape made of metal, here aluminum, and has a wide and flat shape in the front-rear direction, and a plurality of refrigerant passages (53a) extending in the length direction are formed in parallel inside the heat exchange pipe (53). ing. Both ends of the heat exchange pipe (53) are inserted into the pipe insertion holes (61) of both header tanks (51) and (52), respectively, using the brazing material layer of the pipe connection plate (57). It is brazed to the pipe connection plate (57). Note that both ends of the heat exchange pipe (53) enter the communication hole (64) up to an intermediate portion in the thickness direction of the intermediate plate (58) (see FIG. 13). Between the header tanks (51) and (52), a heat exchange tube group (73) consisting of a plurality of heat exchange tubes (53) arranged in parallel at intervals in the left-right direction is arranged in the front-rear direction. Multiple rows, here two rows are arranged. The upper and lower ends of the plurality of heat exchange tubes (53) located in the right half of the front heat exchange tube group (73) are in the first outer bulge portion (59A) and in the front outer bulge portion (71A). Connected to both header tanks (51) and (52) so that the upper and lower ends of the plurality of heat exchange pipes (53), which are also located in the left half, are in the third outer bulge (59C) and on the front side. It is connected to both header tanks (51) and (52) so as to communicate with the outward bulge portion (71A). The upper and lower ends of the plurality of heat exchange tubes (53) located in the right half of the rear heat exchange tube group (73) are in the second outer bulge portion (59B) and the rear outer bulge portion. (71B) are connected to both header tanks (51) and (52) so as to communicate with each other, and the upper and lower ends of a plurality of heat exchange tubes (53) which are also located in the left half are provided with a fourth outer bulging portion (59D ) It is connected to both header tanks so as to communicate with the inside and the rear outward bulge portion (71B).

  The corrugated fin (54) is formed in a corrugated shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, and a plurality of corrugated fins (54) connected in parallel in the front-rear direction to the connecting portion connecting the wave head and the wave bottom. A louver is formed. The corrugated fin (54) is shared by the front and rear heat exchange tube group (73), and the width in the front-rear direction is the front edge of the heat exchange tube (53) of the front heat exchange tube group (73) and the rear heat exchange. The distance between the rear edge of the heat exchanger tube (53) of the tube group (73) is substantially equal. Instead of sharing one corrugated fin (54) between the front and rear heat exchange tube groups (73), each corrugated fin is disposed between adjacent heat exchange tubes (53) of both heat exchange tube groups (73). May be arranged.

  In the above-described evaporator (50), the right front portion including the first outer bulging portion (59A) in the first header tank (51) becomes the refrigerant inlet header (74) which is the refrigerant circulation portion, and is also the second outer side. The right rear part including the bulging part (59B) serves as a refrigerant outlet header (70) which is a refrigerant circulation part. Further, the refrigerant inlet header (74) and the refrigerant outlet header (70) are passed through all the heat exchange pipes (53), the left side portion of the first header tank (51), and the second header tank (52). A refrigerant circulation path is formed.

  Then, piping pipes (75) on the inlet side and the outlet side are connected to the refrigerant inlet header (74) and the refrigerant outlet header (70), respectively, by a refrigerant circulation part connection structure (76).

  As shown in FIGS. 17-20, the refrigerant | coolant distribution part connection structure (76) has two right protrusions (56a) (57a) of the three plates (56) (57) (58) of the first header tank. (58a), the flow path member (77) joined to the refrigerant inlet header (74) and the refrigerant outlet header (70), the inlet side and outlet side piping pipe (75), and both pipes (75 ) To the flow path member (77), and fastening means for fixing the flow path member (77) and the fixation member (78).

  The flow path member (77) is formed of a metal, here an aluminum bare material, into a block shape of a horizontal rectangle when viewed from the right, and one end opening is connected to the refrigerant inlet header (74) via the refrigerant inlet (68). The inlet side refrigerant flow path (80) with the other end opened to the right side surface of the flow path member (77) and the one end opening communicated with the refrigerant outlet header (70) through the refrigerant outlet (69). The other end has an outlet side refrigerant flow path (81) having an opening on the right side surface of the flow path member (77). An insertion portion (80a) (81a) having an inner peripheral surface formed into a cylindrical surface is formed at the right end of each refrigerant flow path (80) (81). Protruding portions (82) protruding rightward and extending along the both end surfaces of the fixing member (78) are integrally formed on the front and rear end portions of the right side surface of the flow path member (77), respectively. A concave groove (83) extending in the vertical direction is formed on the inner surface in the direction. The upper and lower ends of each concave groove (83) are opened on both upper and lower surfaces of each protrusion (82). The side wall on the distal end side of the protruding portion (82) in each concave groove (83) serves as an engaging portion (84) that engages with a convex portion (88) of a fixing member (78) described later. The flow path member (77) is brazed to the first header tank (51) by a brazing sheet having a brazing filler metal layer on both sides, here, an aluminum brazing sheet (85).

  An annular bead (75a) (annular ridge) is formed over the entire circumference at a portion near the tip of each piping pipe (75). An O-ring (86) is attached to the outer peripheral surface of the pipe pipe (75) on the tip side of the annular bead (75a).

  The fixing member (78) is made of a metal, here an aluminum bear material, in the form of an oblong block as viewed from the right. At both front and rear ends of the fixing member (78), there are openings on the lower edge (lower side) and on the right side of the annular bead (75a) in the piping pipe (75) (lengthwise inner portion). A fitting notch (87) is formed. A recess (78a) into which the annular bead (75a) of the pipe for piping (75) is fitted is formed on the peripheral edge of the left end opening of both notches (87) on the left side surface of the fixing member (78). Convex portions (88) that protrude outward in the front-rear direction and fit into the concave grooves (83) of both projecting portions (82) of the flow path member (77) are integrally formed on both front and rear end faces of the fixing member (78). Has been. The protruding height of the convex portion (88) is equal to the depth of the concave groove (83), and the length of the convex portion (88) in the left-right direction is equal to the horizontal width of the concave groove (83). Further, the front-rear direction outer surface of the convex portion (88) has an arc shape protruding outward in the front-rear direction when viewed from the right.

  The fastening means includes one female screw hole (90) formed to extend leftward from the central portion in the front-rear direction on the right side surface of the flow path member (77), and the central portion in the front-rear direction of the fixing member (78). And a bolt (92) that is passed from the right through a bolt insertion hole (91) formed in a penetrating manner in the left-right direction and is screwed into the female screw hole (90) of the flow path member (77). .

  Connection of the inlet side and outlet side piping pipes (75) to the refrigerant inlet header (74) and the refrigerant outlet header (70) is performed as follows.

  First, the inlet-side and outlet-side piping pipes (75) in the insertion portions (80a) (81a) of the inlet-side refrigerant channel (80) and the outlet-side refrigerant channel (81) of the channel member (77), respectively. The portion on the tip side of the annular bead (75a) is inserted. Next, by disposing the fixing member (78) so as to move downward from above the flow path member (77), both protrusions (88) are respectively connected to both protrusions (82) of the flow path member (77). Are inserted into the concave groove (83) of the inner pipe, and the right side of the annular bead (75a) of the inlet side and outlet side pipe pipe (75) is inserted into both notches (87), and bolt insertion holes ( 91) Align the female screw hole (90). At this time, the annular beads (75a) of both pipes (75) are fitted into the recesses (78a) of the fixing member (78). Next, the bolt (92) is passed from the right through the bolt insertion hole (91) of the fixing member (78) and is screwed into the female screw hole (90) of the flow path member (77). Thus, the inlet side and outlet side piping pipes (75) are connected to the refrigerant inlet header (74) and the refrigerant outlet header (70), respectively.

  The evaporator (50) exchanges heat between the compressor, gas cooler, expansion valve as a pressure reducer, accumulator as a gas-liquid separator, and the refrigerant coming out of the gas cooler and the refrigerant coming out of the evaporator and passed through the gas-liquid separator. A supercritical refrigeration cycle is configured together with the intermediate heat exchanger to be mounted on a vehicle such as an automobile as a car air conditioner.

In the evaporator (50) described above, the CO ₂ that has been depressurized after passing through the decompressor passes from the inlet-side piping pipe (75) to the inlet-side refrigerant flow path (80) and the refrigerant inlet (68) of the flow path member (77). ) Enters the refrigerant inlet header (74), flows into the refrigerant passages (53a) of all the heat exchange pipes (53) communicating with the first outer bulge portion (59A). . The CO ₂ flowing into the refrigerant passage (53a) flows downward in the refrigerant passage (53a) and flows into the front outward bulge portion (71A) of the second header tank (52). The CO ₂ that has flowed into the front outward bulge (71A) flows to the left through the communication hole (64) and the communication part (72), and flows into the third outer bulge (59C). The refrigerant flows into the refrigerant passages (53a) of all the heat exchange pipes (53) communicating with the refrigerant, changes the flow direction, flows upward in the refrigerant passages (53a), and flows outside the third header tank (51). Enter the side bulge (59C). The CO ₂ flowing into the third outer bulge portion (59C) passes through the second communication portion (65) of the intermediate plate (58) of the first header tank (51) and passes through the fourth outer bulge portion ( 59D), flows into the refrigerant passages (53a) of all the heat exchange pipes (53) connected to the fourth outer bulging portion (59D), changes the flow direction, and flows into the refrigerant passages. (53a) flows downward and enters the rear outward bulge portion (71B) of the second header tank (52). The CO ₂ that has flowed into the rear outward bulge portion (71B) flows to the right through the communication hole (64) and the communication portion (72) with the inside thereof, and is divided into _second and second bulge portions ( 59B) flows into the refrigerant passages (53a) of all the heat exchange pipes (53), changes the flow direction, flows upward in the refrigerant passages (53a), and flows into the first header tank (51). It enters the refrigerant outlet header (70). Thereafter, CO ₂ passes through the refrigerant outlet (69) and the outlet side refrigerant flow path (81) of the flow path member (77) and is discharged from the outlet side piping pipe (75). Then, while CO ₂ flows in the refrigerant passage (53a) of the heat exchange pipe (53), heat exchange with the air flowing in the direction indicated by the arrow X in FIG. .

  In Embodiment 3, the flow path member (77) is provided with the engaging portion (84), and the fixing member (78) is provided with the convex portion (88) with which the engaging portion (84) is engaged. On the contrary, the flow path member (77) may be provided with a convex portion (88), and the fixing member (78) may be provided with an engaging portion (84) that engages with the convex portion (88). Good.

In the first to third embodiments, CO ₂ is used as a supercritical refrigerant in the supercritical refrigeration cycle, but is not limited thereto, and ethylene, ethane, nitrogen oxide, and the like are used.

Embodiment 4
This embodiment is shown in FIG. 21, and this invention is applied to the connection of pipes for piping which are refrigerant circulation parts of a supercritical refrigeration cycle. In the description of this embodiment, the upper and lower sides and the left and right sides in FIG.

  The refrigerant circulation part connection structure (100) is fixed to the first flow path member (102) fixed to the tip of the first piping pipe (101) and the tip of the second piping pipe (103). The second flow path member (104) and the fastening means for fixing both flow path members (102) and (104).

  The first flow path member (102) is formed in a block shape from a metal, here, an aluminum bare material, and a refrigerant flow path (105) penetrating in the left-right direction is formed at an upper end portion of the first flow path member (102). A large-diameter portion (105a) is formed at the left end portion of the refrigerant flow path (105), and the first flow pipe (101) is inserted into the large-diameter portion (105a) to insert the first flow portion. It is joined to the road member (102) by welding or brazing. A male pipe portion (102a) whose outer peripheral surface is formed into a cylindrical surface is integrally formed in a right protruding manner at the peripheral edge portion of the right end opening of the refrigerant flow channel (105) on the right side surface of the first flow path member (102). Is formed. An O-ring (106) is attached to the outer peripheral surface of the male pipe portion (102a). A protrusion (107) protruding rightward and along the upper end surface of the second flow path member (104) is integrally formed at the upper end of the first flow path member (102), and is formed on the lower surface of the protrusion (107). A concave groove (108) extending in the front-rear direction is formed. Both front and rear ends of the groove (108) are open on both front and rear sides of the protrusion (107). A side wall on the distal end side of the protruding portion (107) in the concave groove (108) is an engaging portion (109) that engages with a convex portion (112) of the second flow path member (104) described later.

  The second flow path member (104) is formed in the shape of a vertically rectangular block when viewed from the rear with a metal, here an aluminum bear material, and penetrates the upper end of the second flow path member in the left-right direction and the first flow path member ( A refrigerant flow path (111) communicating with the refrigerant flow path (105) of 102) is formed. An insertion part (111a) into which the male pipe part (102a) of the first flow path member (102) is inserted is formed at the left end of the refrigerant flow path (111). Yes. A large-diameter portion (111b) is formed at the right end portion of the refrigerant flow path (111), and the tip of the second piping pipe (103) is inserted into the large-diameter portion (111b) so that the second flow It is joined to the road member (104) by welding or brazing. A convex portion (112) protruding upward and fitting into the concave groove (108) of the first flow path member (102) is integrally formed on the upper end surface of the second flow path member (104). The protruding height of the convex portion (112) is equal to the depth of the concave groove (108), and the length in the left-right direction of the convex portion (112) is equal to the width in the horizontal direction of the concave groove (108). Although not shown, the upper surface of the convex portion (112) has an arc shape protruding upward as viewed from the left. Here, the distance between the center line of the insertion part (111a) in the refrigerant flow path (111) and the upper end of the convex part (112) is the outer peripheral surface of the male pipe part (102a) in the first flow path member (102). It is equal to the distance between the center line and the bottom surface of the groove (108).

  The fastening means is formed in a penetrating manner in the left-right direction at the lower end portion of the second flow path member (104), so that it is penetrating in the left-right direction at the lower end portion of the first flow path member (102). The bolt is inserted into the formed bolt insertion hole (114) from the left, and includes a bolt (115) that is screwed into the female screw hole (113) of the second flow path member (104).

  The first piping pipe (101) and the second piping pipe (103) are connected as follows.

  First, the male pipe part (102a) of the first flow path member (102) is inserted into the insertion part (111a) of the refrigerant flow path (111) of the second flow path member (104). At this time, the bolt insertion hole (114) of the first flow path member (102) is displaced from the female screw hole (113) of the second flow path member (104). Keep it. Next, by rotating the first flow path member (102) around the center line on the outer peripheral surface of the male pipe portion (102a), the convex portion (112) of the second flow path member (104) is moved to the first flow path. The bolt is inserted into the concave groove (108) of the member (102), and the bolt insertion hole (114) and the female screw hole (113) are matched. Next, the bolt (115) is passed from the left through the bolt insertion hole (114) of the first flow path member (102) and screwed into the female screw hole (113) of the second flow path member (104). In this way, both pipes (101) and (103) are connected.

  In the fourth embodiment, the first flow path member (102) is provided with the engaging portion (109), and the second flow path member (104) is engaged with the convex portion (112) where the engagement portion (109) is engaged. Contrary to this, the first flow path member (102) is provided with a convex portion (112), and the second flow path member (104) is engaged with the convex portion (112). A portion (109) may be provided.

  As in the case of the fourth embodiment, the connection structure of the first to third embodiments can be applied to the connection of pipes for the refrigeration cycle. In this case, one end of the flow path member (26) (77) is connected to one end of the refrigerant flow path (28) (80) (81) on the side where the insertion part (28a) (80a) (81a) is formed. The end of the pipe is inserted and joined to the flow path members (26) and (77). The other piping pipe is fixed by the fixing members (27) and (78).

1 is a perspective view showing an overall configuration of Embodiment 1 of a gas cooler to which the present invention is applied. FIG. 2 is a partially omitted vertical sectional view of the gas cooler of FIG. It is a perspective view which shows the 1st header tank of the gas cooler of FIG. It is a disassembled perspective view which shows the 1st header tank of the gas cooler of FIG. It is an AA line expanded sectional view of FIG. It is a disassembled perspective view which shows the 2nd header tank of the gas cooler of FIG. FIG. 3 is an enlarged sectional view taken along line B-B in FIG. 2. FIG. 3 is an enlarged sectional view taken along the line CC in FIG. 2. It is a disassembled perspective view which shows the connection structure which connects the pipe for outlet side piping to the refrigerant | coolant exit of the gas cooler of FIG. It is sectional drawing equivalent to FIG. 8 which shows Embodiment 2 of the gas cooler to which this invention is applied. It is a disassembled perspective view equivalent to FIG. 9 of the gas cooler of FIG. It is a perspective view which shows the whole structure of the evaporator of Embodiment 3 to which this invention is applied. FIG. 13 is a partially omitted vertical cross-sectional view of the evaporator of FIG. It is the DD sectional view taken on the line of FIG. It is a disassembled perspective view which shows the 1st header tank of the evaporator of FIG. It is a disassembled perspective view which shows the 2nd header tank of the evaporator of FIG. It is the EE line expanded sectional view of FIG. It is the FF line expanded sectional view which notched a part of FIG. It is a disassembled perspective view which shows the right end part of the 1st header tank in the evaporator of FIG. It is a disassembled perspective view which shows the connection structure which connects the pipe for inlet side piping, and the pipe for outlet side piping to the refrigerant inlet and refrigerant outlet of the evaporator of FIG. It is a vertical sectional view showing the connection structure of pipes for piping of Embodiment 4 to which the present invention is applied.

(1): Gas cooler (heat exchanger)
(12): Refrigerant inlet
(13): Refrigerant outlet
(21): Refrigerant inlet header (refrigerant distribution part)
(22): Refrigerant outlet header (refrigerant distribution part)
(23) (40): Refrigerant distribution part connection structure
(25): Pipe for piping
(25a): Annular beads (annular ridges)
(26): Channel member
(27): Fixed member
(28): Refrigerant flow path
(29): Protruding part
(31): Groove
(32): Engagement part
(34): Notch
(35): Convex
(36): Female thread hole
(37): Bolt insertion hole
(38): Bolt
(41): First flow path member
(42): Second flow path member
(42a): Male pipe section
(43): Refrigerant flow path
(44): Pipe for piping
(50): Evaporator (heat exchanger)
(68): Refrigerant inlet
(69): Refrigerant outlet
(70): Refrigerant outlet header (refrigerant distribution part)
(74): Refrigerant inlet header (refrigerant distribution part)
(75): Pipe for piping
(75a): Annular beads (annular ridges)
(76): Refrigerant distribution part connection structure
(77): Channel member
(78): Fixed member
(80) (81): Refrigerant flow path
(82): Projection
(83): Groove
(84): Engagement part
(87): Notch
(88): Convex
(90): Female thread hole
(91): Bolt insertion hole
(92): Bolt
(100): Refrigerant distribution part connection structure
(101) (103): Pipe for piping (refrigerant distribution part)
(102): First flow path member
(102a): Male pipe
(104): Second flow path member
(105): Refrigerant flow path
(107): Projection
(108): Groove
(109): Engagement part
(111): Refrigerant flow path
(111a): Insertion section
(112): Convex part
(113): Female thread hole
(114): Bolt insertion hole
(115): Bolt

Claims (5)

A flow path member having a refrigerant flow path leading to the refrigerant flow part through the one end opening, and a refrigerant connected to the flow path member in a state where the tip end is fitted in the other end opening of the refrigerant flow path of the flow path member A pipe as a circulation part, a fixing member for fixing the pipe to the flow path member, and a fastening means for fixing the flow path member and the fixing member, and either one of the flow path member and the fixing member, An engaging portion that engages with the other part of the pipe to prevent separation between the flow path member and the fixing member is provided , and an annular ridge is formed over the entire circumference near the tip of the pipe. The portion on the more distal end side is fitted into the other end opening of the refrigerant flow path of the flow path member, opens to one side edge of the fixing member, and the refrigerant flow path sandwiching the annular ridge in the pipe A notch into which the part on the opposite side to the inset part fits is formed, and the tip One of the flow path member and the fixing member is inserted into the notch of the fixing member from the side by the pipe having the portion inserted into the other end opening of the refrigerant flow path of the flow path member. The refrigerant | coolant circulation part connection structure of the refrigerating cycle by which the engaging part provided in 1 is made to engage with the other one part . The end of the flow path member on the side where the refrigerant flow path is formed is provided with a protrusion that protrudes toward the fixing member and extends along the end surface of the fixing member. A recess groove extending in the depth direction of the notch is formed, and an end surface of the fixing member is provided with an outward projecting protrusion that fits into the recess groove. The refrigerant circulation part connection structure of the refrigeration cycle according to claim 1, wherein the refrigerant circulation part connection structure is an engaging part that engages with the refrigerant. The tip of a flow channel member side pipe, which is a refrigerant flow portion, is fitted into the one end opening of the refrigerant flow channel of the flow channel member, and the flow channel member side pipe is joined to the flow channel member. The refrigerant | coolant distribution part connection structure of the refrigerating cycle of description. A refrigerant flow path communicating with the refrigerant circulation section is formed at one end and a first flow path member formed with a female screw hole at the other end, and a refrigerant flow path communicating with the refrigerant circulation section is formed at one end. A second flow path member having a bolt insertion hole formed at the other end, and a bolt that is passed through the bolt insertion hole of the second flow path member and screwed into the female thread hole of the first flow path member are prepared. thing,
In the first flow path member, the end of the refrigerant flow path on the side where the refrigerant flow path is formed is provided with a protrusion that protrudes toward the second flow path member and extends along the end surface of the second flow path member. Forming a concave groove extending in the width direction of both flow path members on the surface facing the end face side of the second flow path member, and further providing a convex portion projecting outward to fit in the concave groove on the end face of the second flow path member;
At the end of the first flow path member on the second flow path member side in the refrigerant flow path, an insertion portion having an inner peripheral surface formed into a cylindrical surface is formed, and the first flow path member side of the second flow path member A peripheral portion of the opening of the refrigerant flow path on the surface facing the surface is provided with a male pipe portion whose outer peripheral surface is cylindrical and inserted into the insertion portion of the refrigerant flow path of the first flow path member;
The male pipe portion of the second flow path member is inserted into the insertion portion of the refrigerant flow path of the first flow path member so that the female thread hole of the first flow path member and the bolt insertion hole of the second flow path member are displaced. ,
By rotating the second flow path member around the center line of the male pipe portion with respect to the first flow path member, the female screw hole and the bolt insertion hole are matched, and the convex portion is fitted in the concave groove. Engaging the side wall of the projecting portion tip side of the concave groove with the convex portion,
And the refrigerant | coolant distribution | circulation part connection method of a refrigerating cycle including screw-fitting in the internal thread hole of a 1st flow path member through a volt | bolt in the bolt insertion hole of a 2nd flow path member . A refrigerant flow path leading to the refrigerant circulation section is formed at one end and a first flow path member having a bolt insertion hole formed at the other end, and a refrigerant flow path communicating with the refrigerant circulation section is formed at one end. A second flow path member having a female screw hole formed at the other end and a bolt that is passed through the bolt insertion hole of the first flow path member and screwed into the female screw hole of the second flow path member are prepared. thing,
In the first flow path member, the end of the refrigerant flow path on the side where the refrigerant flow path is formed is provided with a protrusion that protrudes toward the second flow path member and extends along the end surface of the second flow path member. Forming a concave groove extending in the width direction of both flow path members on the surface facing the end face side of the second flow path member, and further providing a convex portion projecting outward to fit in the concave groove on the end face of the second flow path member;
At the end of the second flow path member on the first flow path member side in the refrigerant flow path, an insertion portion whose inner peripheral surface is formed into a cylindrical surface is formed, and the second flow path member side of the first flow path member A peripheral portion of the opening of the refrigerant flow path on the surface facing the surface is provided with a male pipe portion whose outer peripheral surface is cylindrical and inserted into the insertion portion of the refrigerant flow path of the second flow path member;
The male pipe portion of the first flow path member is inserted into the insertion portion of the refrigerant flow path of the second flow path member so that the female screw hole of the second flow path member and the bolt insertion hole of the first flow path member are displaced. ,
By rotating the first flow path member around the center line of the male pipe portion with respect to the second flow path member, the female screw hole and the bolt insertion hole are matched, and the convex portion is fitted in the concave groove. Engaging the side wall of the projecting portion tip side of the concave groove with the convex portion,
And the refrigerant | coolant distribution | circulation part connection method of a refrigerating cycle including screw-fitting in the internal thread hole of a 2nd flow path member through a volt | bolt in the bolt insertion hole of a 1st flow path member .

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