DE102009049234A1 - Pipe connection for use in connecting structure for double pipe, is connected with heat exchanging pipe, which has pipe section through which fluid flows, and has other pipe section, through which other fluid flows - Google Patents

Abstract

The pipe connection is connected with a heat exchanging pipe, which has a pipe section through which a fluid flows, and has another pipe section, through which another fluid flows. Two blocks are provided, which are fitted with two connection holes respectively. The former pipe section has a preceding end section, which protrudes from an end of the latter pipe section in a longitudinal direction. Independent claims are included for the following: (1) a connecting structure, which has a heat exchanging pipe, where end sections are made of brazing material; and (2) a method for connecting a heat exchanging pipe and pipe connection.

Description

The The present invention relates to a pipe joint, a joint structure a heat exchange tube and a method of bonding a heat exchange tube and a pipe joint.

Conventionally, a pipe joint connected to a heat exchange pipe having a first pipe section and a second pipe section is used. In the heat exchange tube, a first fluid flowing in the first tube section may exchange heat with a second fluid flowing in the second tube section. For example, describe JP-A-2001-235081 and JP-A-2006-003071 this type of pipe connection. According to a in JP-A-2001-235081 and JP-A-2006-003071 As described above, a double pipe has an inner pipe portion through which a first fluid flows, and an outer pipe portion disposed outside the inner pipe portion through which a second fluid flows, and a protruding end portion (a protruding portion of the inner pipe portion) extending from one end of the inner pipe portion Outboard pipe section protrudes outward, is provided at one end of the inner pipe section. The double pipe is connected to an external pipe.

JP-A-2001-235081 describes two types of pipe joints for a double pipe, that is, first and second pipe joints. The first pipe joint is composed of a main body, a connection pipe, and first and second connection portions. The main body is attached to one end of an outer pipe section and surrounds a protruding end portion of an inner pipe section. A passage through which a first fluid flows is provided in the main body. The connection pipe is connected to an opening formed on the main body and communicates with a passage in the main body. The first connection portion connects one end of the protruding end portion to a first external pipe for guiding the first fluid. The second connection portion connects the connection pipe to a second external pipe for conducting a second fluid.

in the In contrast, the second pipe connection is of a block-shaped Main body and first and second connecting portions built up. The main body is at one end of an outer pipe section attached, and an internal passage through which a second fluid flows is formed in the main body. Of the first connecting portion is formed in the main body and connects one end of a protruding end portion of an inner pipe section with a first external tube for conducting a first fluid. Of the second connecting portion is formed in the main body and connects the end of the outer tube section with a second external pipe for conducting the second fluid.

Furthermore, an in JP-A-2006-003071 described pipe joint for a double pipe a structure similar to the second pipe joint structure.

In The first pipe connection must be compared to the second pipe connection except the first and second connection sections the Connecting pipe can be provided. Furthermore, braze sections be increased for connecting the respective components, and a Method for airtightness test can be tightened. In contrast, the first and second connection portions in the second pipe joint in the Main body formed. In this way, the structure becomes the second pipe joint simplified, and brazing sections are reduced compared to the first pipe joint.

however in the case where the second pipe connection is actually is connected by brazing to the double pipe, the brazing section of the second pipe joint and the Inner pipe section in the interior of the first connecting portion of the main body, and the brazing section can not be confirmed visually from the outside. Consequently, the brazing of the inner pipe section and of the main body difficult. If, for example, a brazing material at the braze sections on the inner tube section and the outer tube section is arranged, and burner brazing carried out, it is difficult to confirm directly whether the brazing material melted on the inner pipe section is, and the melted state of the brazing material on the Inner pipe section must be based on the melted state of the brazing material the outer tube section are determined. If also the airtightness test on the braze section can be performed, the interruption of airtightness not visually confirmed from the outside, and it is difficult to confirm the interruption of airtightness. In the case where the second pipe joint than the pipe joint is used for a double pipe, therefore occurs easily a faulty braze on, and the brazing quality is compared to the case where the first pipe connection is used becomes unstable. The difficulty does not only occur in the connection structure the double pipe and the pipe connection, but also in one Connection structure of a heat exchange tube, in which a first fluid heat exchange with a second fluid can, and the pipe connection on.

in view of From the points described above, it is an object of the present invention Invention to simplify a structure of a pipe joint and the brazing quality at connection sections of a Heat exchange tube and the pipe joint to stabilize.

According to one first aspect of the present invention comprises a pipe joint, which is to be connected to a heat exchange tube, the a first pipe section through which a first fluid flows, and a second pipe section through which a second fluid flows, has, wherein the first pipe section and the second pipe section are arranged such that the first fluid is capable of exchanging heat with the second fluid, the first Pipe section has a protruding end section, that of a End of the second pipe section in a longitudinal direction the second pipe section protrudes, wherein the pipe joint a first block with a first connection hole has that appropriate is to communicate with the first pipe section, so that the first fluid flows through the first communication hole; and a second block having a second connection hole suitable is to communicate with the second pipe section, so that the second fluid flows through the second communication hole. The first block is arranged so that it has a margin with a predetermined dimension therebetween opposite to second block is. The first block has a first connection hole on a surface of the first block that faced to the second block, so that the heat exchange tube is connected to the first block, wherein the projecting end portion near its end, which is in the first port hole. The second block has a second connection hole on a surface of the second block, which is opposite to the first block, and a third connection hole on a side opposite to the second block Surface, so that the heat exchange tube with connected to the second block, wherein the projecting end portion is in the second connection hole and the second pipe section is in the third port hole. At least a first Connecting portion of the projecting end portion and the first Terminal hole, located at a first position near the end of the projecting end portion, and a second terminal portion the protruding end portion and the second connection hole, the at a second position spaced from the first position are exposed through the scope to the outside, when the projecting end portion is in the first and second Connecting holes located and the second pipe section is in the third port hole.

In the pipe connection does not need the connecting pipe as in the conventional pipe connection with the main body, the connecting tube and the first and second connection connections provided become. Consequently, the structure of the pipe joint can be simplified become. In addition, the connection sections (i.e., braze sections) at the pipe joint is reduced and this can be a method for airtightness testing be defused.

Further the pipe joint is constructed such that an outer circumference of the projecting end portion by the clearance between the first and second blocks exposed to the outside is, wherein the first pipe section is the first and second blocks located. In this way, the connection sections the protruding end portion and the pipe joint are visually confirmed, when the protruding end portion and the pipe joint are brazed or if the airtightness test is performed becomes.

Therefore the structure of the pipe joint can be simplified, and the Brazing quality at the connection sections of the Heat exchange tube and the pipe joint can be stabilized become. It must be noted that the word "pipe" in of the present invention does not apply to a tube having a circular shape Cross section in a direction perpendicular to a fluid flow direction is limited and a tube with a cross section with shallow Form or a cross-section of rectangular shape.

According to a second aspect of the present invention, a pipe joint comprises a heat exchange pipe having a first pipe section through which a first fluid flows and a second pipe section through which a second fluid flows, wherein the first pipe section and the second pipe section are arranged such that the first pipe section first fluid is capable of exchanging heat with the second fluid; and a pipe joint connected to the heat exchange pipe. The first pipe section has a protruding end portion projecting from an end of the second pipe section in a longitudinal direction of the second pipe section. The pipe joint includes a first block having a first communicating hole adapted to communicate with the first pipe section so that the first fluid flows through the first communicating hole; a second block having a second communication hole adapted to communicate with the second pipe section so that the second fluid flows through the second communication hole; and a terminal portion connecting the first block and the second block. The first block is arranged to be opposite to the second block with a clearance of a predetermined dimension therebetween. Of the first block has a first connection hole on a surface of the first block, which is opposite to the second block, so that the heat exchange tube is connected to the pipe joint, wherein the projecting end portion is near its end, which is located in the first connection hole. The second block has a second connection hole on a surface of the second block, which is opposite to the first block, and a third connection hole on a surface opposite to the second block, so that the heat exchange tube is connected to the pipe joint, the projecting end portion is located in the second connection hole and the second pipe section is located in the third connection hole. At least one first terminal portion of the projecting end portion and the first terminal hole located at a first position near the end of the projecting end portion and a second terminal portion of the projecting end portion and the second terminal hole located at a second position spaced from the first position are exposed through the clearance to the outside when the projecting end portion is located in the first and second terminal holes and the second pipe section is located in the third connection hole.

In the connection structure of the heat exchange tube and the Pipe joint can be compared to the structure of the pipe joint simplified to the conventional pipe joint, and the terminal portions of the projecting end portion and the first, second blocks can be visually confirmed become. Therefore, the connection structure of the heat exchange tube and the pipe joint, and the brazing quality at the connecting portions of the heat exchange tube and the pipe connection can be stabilized.

According to one Third aspect of the present invention includes a pipe joint a heat exchange tube with a first pipe section, through which flows a first fluid, and a second pipe section, through which a second fluid flows, the first Pipe section and the second pipe section are arranged such that the first fluid is capable of heat with the second fluid exchange; and a pipe joint with the heat exchange pipe connected is. The first pipe section has a projecting end section, that of an end of the second pipe section in a longitudinal direction protrudes the second pipe section. The pipe connection comprises a first block having a first connection hole suitable is to communicate with the first pipe section, so that the first fluid flows through the first communication hole; and a second block having a second connection hole suitable is to communicate with the second pipe section, so that the second fluid flows through the second communication hole. Of the first block is arranged so that it with a margin with a predetermined dimension therebetween opposite to the second block is. The first block has a first connection hole on a surface of the first block, which is opposite to the second block, so that the heat exchange tube connected to pipe joint is with the projecting end portion near its end, the is in the first port hole. The second block has a second connection hole on a surface of the second Block, which is opposite to the first block, and a third one Connection hole on a surface opposite to the second block, such that the heat exchange tube is connected to the pipe connection, wherein the projecting end portion is in the second connection hole and the second pipe section is in the third connection hole located. At least one first terminal portion of the above End portion and the first connection hole, located at a first Position near the end of the projecting end portion, and a second terminal portion of the projecting end portion and the second connection hole located at one of the first Position spaced second position are through the Clearance exposed to the outside when the protruding End portion in the first and second connection holes and the second pipe section is in the third connection hole located. The given dimension is set small, so that brazing the first terminal section and brazing of the second connection section at once can be.

In the connection structure of the heat exchange tube and the Pipe connection can simplify the structure of the pipe joint are, and the terminal portions of the projecting end portion and the first, second blocks can be visual beeing confirmed. Therefore, the connection structure of the Heat exchange tube and the pipe connection simplified and the brazing quality at the connection sections of the heat exchange tube and the pipe joint can be stabilized become.

Furthermore For example, the first terminal portion of the projecting end portion and the first connection hole and the second connection portion of the projecting end portion and the second connection hole once visually confirmed. The material that the The first pipe section can be less corrosion resistant its as the material that builds up the second pipe section.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description given with reference to the accompanying drawings, in which:

1 is a schematic diagram showing a structure of a refrigeration cycle device according to a first embodiment of the present invention;

2 (a) and 2 B) are schematic diagrams showing a connection structure of a heat exchange tube and a pipe joint according to the first embodiment of the present invention;

3 Fig. 12 is a perspective view showing the heat exchange tube according to the first embodiment of the present invention;

4 (a) to 4 (c) are schematic diagrams showing a fixing method of the heat exchange tube and the pipe joint according to the first embodiment of the present invention;

5 (a) and 5 (b) are schematic diagrams showing a connection structure of a heat exchange tube and a pipe joint according to a second embodiment of the present invention;

6 (a) and 6 (b) are schematic diagrams showing a connection structure of a heat exchange tube and a pipe joint according to a third embodiment of the present invention;

7 (a) to 7 (c) are schematic diagrams showing a fixing method of the heat exchange tube and the pipe joint according to the third embodiment of the present invention;

8th Fig. 12 is a perspective view showing a heat exchange tube according to a fourth embodiment of the present invention;

9 (a) and 9 (b) are schematic diagrams showing a connection structure of a heat exchange tube and a pipe joint according to the fourth embodiment of the present invention;

10 Fig. 12 is a perspective view showing a heat exchange tube according to another embodiment of the present invention;

11 Fig. 12 is a perspective view showing a heat exchange tube according to another embodiment of the present invention;

12 (a) and 12 (b) are schematic diagrams showing a connection structure of a heat exchange tube and a pipe joint according to another embodiment of the present invention;

13 (a) and 13 (b) are schematic diagrams showing a connection structure of a heat exchange tube and a pipe joint according to another embodiment of the present invention; and

14 (a) and 14 (b) are schematic diagrams showing a connection structure of a heat exchange tube and a pipe joint according to another embodiment of the present invention;

First Embodiment

Hereinafter, a first embodiment of the present invention will be described with reference to FIG 1 to 4 (c) described. 1 FIG. 10 is a schematic diagram showing a structure of a refrigeration cycle device for a vehicle according to the first embodiment of the present invention. FIG.

The present invention is directed to an indoor heat exchanger 16 a refrigeration cycle device 10 applied to a vehicle. In the present embodiment, the refrigeration cycle device is 10 a subcritical refrigeration cycle device in which a chlorofluorohydrocarbon (CFC) refrigerant, an HC-based alternative to CFC or the like is used as a refrigerant in a refrigeration cycle.

As in 1 shown, a compressor sucks 11 the refrigerant to be discharged and compresses it by being powered by an external drive source, such as a drive source for driving. A capacitor 12 is a high-pressure side heat exchanger, that of the compressor 11 ejected high pressure refrigerant by the heat exchange with ambient air cools.

A collector 15 is a gas-liquid separator, which is the cooled high pressure refrigerant coming out of the condenser 12 has flowed, in a gas-phase refrigerant and a liquid-phase refrigerant separates. Only the liquid-phase refrigerant flows into the indoor heat exchanger described below 16 and the liquid-phase refrigerant is stored therein as an excess refrigerant in the refrigeration cycle.

An expansion valve 13 is a pressure reduction section that reduces the pressure of the inside heat exchangers 16 has flowed refrigerant reduced, and is constructed in the present embodiment of a variable throttle or the like. An evaporator 14 is a low-pressure side heat exchanger, that of the expansion valve 13 low-pressure low-pressure refrigerant evaporates. The evaporator 14 evaporates the low-pressure refrigerant by the heat exchange between the low-pressure refrigerant and in a vehicle compartment blown air, so that the evaporator 14 has a refrigeration capacity.

The indoor heat exchanger 16 exchanges heat between the high pressure refrigerant passing through a high pressure side passage (a refrigerant passage between the condenser 12 and the expansion valve 13 ), and the low-pressure refrigerant passing through a low-pressure side passage (a refrigerant passage between the evaporator 14 and the compressor 11 ) flows out, leaving a temperature of the refrigerant flowing into the evaporator 14 flow is reduced.

In the indoor heat exchanger 16 exchange this at an outlet of the evaporator 14 cooled low pressure refrigerant at an outlet of the condenser 12 Heat out with the high pressure refrigerant, which is a higher temperature than the refrigerant at the outlet of the evaporator 14 Has. In this way, the enthalpy of the refrigerant entering the evaporator 14 after that flows into the expansion valve 13 flowing refrigerant is cooled, according to the amount of heat exchange in the indoor heat exchanger 16 compared to the case where the indoor heat exchanger 16 not provided, smaller.

Therefore, the enthalpy difference between an inlet and the outlet of the evaporator becomes 14 corresponding to the enthalpy reduction of the refrigerant at the inlet of the evaporator 14 compared to the case where the indoor heat exchanger 16 not provided, larger. Consequently, a cooling capacity in the evaporator 14 be improved.

A connection structure of a heat exchange tube 20 and a pipe connection 30 at one end of the indoor heat exchanger 16 is referring to 2 (a) to 3 described. 2 (a) and 2 B) are schematic diagrams showing a connection structure of the heat exchange tube 20 and the pipe connection 30 at the end of the indoor heat exchanger 16 of the present embodiment. 3 is a perspective view showing the heat exchange tube 20 of the present embodiment. 2 (a) is a plan view of the connection structure, and 2 B) is one along the line IIB-IIB in 2 (a) taken cross-sectional view.

A double tube heat exchanger with the heat exchange tube 20 , which is constructed of a double pipe, is called the indoor heat exchanger 16 used. As in particular in 2 (a) and 2 B) shown is the heat exchange tube 20 (The double pipe) with a first pipe section 21 (also referred to hereinafter as an inner pipe section) and a second pipe section 22 (also referred to hereinafter as an outer pipe section) with the pipe joint 30 for the double pipe at the end of the indoor heat exchanger 16 connected. The pipe connection 30 is connected to one end of the double pipe. The heat exchange tube 20 and the pipe connection 30 are made of a material such as aluminum to be able to be connected by brazing.

Hereinafter, the connection structure of the present invention will be described at the end of the indoor heat exchanger 16 described. As in 3 shown is the heat exchange tube 20 from the double pipe with the cylindrical inner pipe section 21 and the cylindrical outer tube section 22 located on an outer circumference of the inner pipe section 21 is built up. The inner pipe section 21 and the outer tube section 22 are arranged concentrically. An inner diameter of the outer pipe section 22 is larger than an outer diameter of the inner pipe section 21 set to a space between the outer pipe section 22 and the inner pipe section 21 allow. The inner pipe section 21 and the outer tube section 22 can be arranged such that an axis center of the inner pipe section 21 from the outer pipe section 22 is disconnected.

A first fluid passage 21a through which the low-pressure refrigerant flows is in the inner pipe section 21 formed, and a second fluid passage 22a through which the high-pressure refrigerant flows is between the outer pipe section 22 and the inner pipe section 21 educated. The double pipe is constructed to be able to pass through a wall of the inner pipe section 21 between the low pressure refrigerant, in the first fluid passage 21a flows, and the high pressure refrigerant in the second fluid passage 22a flows to exchange heat. The double piping may be constructed such that the high-pressure refrigerant in the first fluid passage 21a flows and the low pressure refrigerant in the second fluid passage 22a flows.

A length of the inner pipe section 21 is larger than that of the outer pipe section in a longitudinal direction (ie, in a direction of the refrigerant flow) 22 , That is, a length of the first fluid passage 21a is larger than that of the second fluid passage 22a ,

Consequently, there is an end of the inner pipe section 21 from one end of the outer pipe section 22 in the longitudinal direction, wherein the inner pipe section 21 in the outer tube section 22 located. A section of the inner pipe section 21 coming from the end of the outer tube 22 protrudes, is a projecting end portion 21b ,

As in 2 (a) and 2 B) shown is the pipe connection 30 from a block-shaped main body 31 constructed with one end of the heat exchange tube 20 connected is. The main body 31 is integral with square prism-shaped first and second blocks 32 . 33 and a connection section 34 , the one end of the first block 32 and one end of the second block 33 connects, builds up.

The main body 31 is constructed such that the first block 32 with a clearance of a predetermined dimension (W) therebetween opposite to the second block 33 is. As in the cross-sectional view of 2 B) shown are the first block 32 , the second block 33 and the connecting section 34 built to have approximately a U-like shape.

The predetermined dimension (W) of the margin is set such that terminal portions of the first and second blocks 32 . 33 and the projecting end portion 21b can be considered through the scope.

The scope between the first block 32 and the second block 33 extends from one side of an outer surface of the main body 31 along radial directions of a first connection hole 32a (also referred to as an inner pipe connection hole hereinafter) and a second connection hole 33a (also referred to as a through hole hereinafter) described below. The clearance is provided so as to be the inner pipe connection hole 32a and the through hole 33a interspersed.

The first block 32 connects the inner pipe section 21 with a first external pipe 41 , and the second block 33 connects the outer pipe section 22 with a second external pipe 42 , A connection block 40 is to wipe the respective blocks 32 . 33 and the respective external pipes 41 . 42 provided so that the first block 32 with the first external pipe 41 connected and the second block 33 with the second external pipe 42 connected is.

The first block 32 has the inner pipe connection hole 32a on a surface through the clearance opposite to the second block 33 is. The inner pipe connection hole 32a is formed around the projecting end portion 21b near one of its ends (ie, one end of the projecting end portion 21b ) and the first block 32 with the end of the projecting end portion 21b located in the inner pipe connection hole 32a is to connect. The inner pipe connection hole 32a has a hole diameter sufficient to have an outer periphery of the projecting end portion therein 21b fit.

Because the space between the first block 32 and the second block 33 is formed, a connection portion of the projecting end portion 21b and the inner pipe connection hole 32a (a first terminal portion) are considered by the clearance, wherein the projecting end portion 21b in the inner pipe connection hole 32a and the through hole 33a of the second block 33 located. Therefore, if the inner pipe connection hole 32a by brazing with the end of the projecting end portion 21b is connected, the Hartlötungszustand can be visually confirmed from the outside.

The first block 32 has a first connection passage 32b (eg a first connection hole). One of its ends is connected to the inner pipe connection hole 32a and its other end is through a refrigerant passage 40a in the connection block 40 with the first external pipe 41 in connection. That is, the first fluid passage 21a in the projecting end portion 21b stands by the first connection passage 32b with the first external pipe 41 in conjunction with the end of the projecting end portion 21b with the inner pipe connection hole 32a connected is.

The first external pipe 41 connects the end of the inner pipe section 21 of the indoor heat exchanger 16 with an inlet of the expansion valve 13 or an outlet of the collector 15 , The connection block 40 has an insertion hole 40b into which the first external pipe 41 is fitted. The first block 32 has a circular protruding section 32c in a direction perpendicular to an axis direction of the inner pipe connection hole 32a protrudes. The external pipe 41 is through the insertion hole 40b with the first circular protruding portion 32c connected. The first external pipe 41 is shown by a dashed line and is located on a left side in 2 B) ,

Because the first circular protruding section 32c in the direction perpendicular to the axis direction of the inner pipe connection hole 32a protrudes, a flow direction of the high-pressure refrigerant in the first block 32 between the first circular protruding portion 32c and the Inner tube connecting hole 32a turned 90 degrees.

The connection block 40 has an insertion hole 40c into which the first circular protruding section 32c is fitted. An outer surface of the first circular projecting portion 32c is in contact with the insertion hole 40c , An annular groove 32d is on the first circular protruding section 32c educated. A sealing material 36 , such as an O-ring, is in the annular groove 32d is fitted, and thereby the refrigerant can be restricted thereby, from a connection portion between the first circular protruding portion 32c and the insertion hole 40c to lick.

The second block 33 has the through hole 33a on a surface through the clearance opposite to the first block 32 is. The through hole 33a is formed around the projecting end portion 21b and the second block 33 to connect, the projecting end portion 21b in the through hole 33a located after the protruding end portion 21b the through hole 33a penetrates.

The through hole 33a has a hole diameter sufficient to the outer periphery of the projecting end portion 21b to fit in it. The through hole 33a is formed such that the inner pipe connection hole 32a and the through hole 33a are arranged concentrically. In addition, the hole diameter of the through hole is 33a equal to that of the inner pipe connection hole 32a established.

Since, as described above, the margin between the first block 32 and the second block 33 is formed, a connection portion of the projecting end portion 21b and the through hole 33a (a second terminal portion) are considered by the clearance, wherein the projecting end portion 21b in the inner pipe connection hole 32a and the through hole 33a located. Therefore, if the through hole 33a by brazing with the outer periphery of the projecting end portion 21b is connected, the Hartlötungszustand can be visually confirmed from the outside.

Besides, the second block has 33 a third connection hole 33b (also referred to hereinafter as an outer tube connection hole) on an opposite surface of the surface facing the first block 32 is opposite. The outer pipe connection hole 33b is formed around the outer pipe section 22 near its end (ie the end of the outer pipe section 22 ) and the second block 33 connect, with the end of the outer pipe section 22 in the outer pipe connection hole 33b located. The outer pipe connection hole 33b has a hole diameter sufficient to an outer periphery of the end of the outer pipe section 22 to fit in it. As a connecting portion of the outer pipe section 22 and the outer pipe connection hole 33b (A third terminal portion) is exposed to the outside, the brazing state can be visually confirmed from the outside.

The second block 33 has a second connection passage 33c (ie a second connection hole). One of its ends is connected to the outer pipe connection hole 33b and its other end is through a refrigerant passage 40d in the connection block 40 with the second external pipe 42 in connection. That is, the second fluid passage 22a between the inner pipe section 21 and the outer tube section 22 stands by the second connection passage 33c with the second external pipe 42 in conjunction with the end of the outer tube section 22 with the outer pipe connection hole 33b connected is.

The second external pipe 42 connects the end of the outer pipe section 22 of the indoor heat exchanger 16 with an inlet of the compressor 11 or the outlet of the evaporator 14 , The connection block 40 has an insertion hole 40e into which the second external pipe 42 is fitted. The second block 33 has a second circular protruding portion 33d in a direction perpendicular to an axis direction of the outer pipe connection hole 33b protrudes. The second external pipe 42 is through the insertion hole 40e with the second circular projecting portion 33d connected. The second external pipe 42 is shown by a dashed line and is located in 2 B) on a right side.

Because the second circular protruding section 33d and the first circular projecting portion 32c project in the same direction, a flow direction of the low-pressure refrigerant in the second block 33 between the outer pipe connection hole 33b and the second circular projecting portion 33d as well as the one in the first block 32 flowing high-pressure refrigerant rotated 90 degrees.

That is, in the present embodiment, the flow direction of the refrigerant in the inner pipe section becomes 21 turned 90 degrees and flows into the first external tube 41 , and the flow direction of the refrigerant in the outer pipe section 22 is rotated 90 degrees and flows through the main body 31 the pipe connection 30 in the second external pipe 42 ,

The connection block 40 has an insertion hole 40f into which the second circular protruding section 33d is fitted. An outer surface of the second circular projecting portion 33d is in contact with the insertion hole 40f , An annular groove 33e is on the second circular protruding portion 33d educated. A sealing material 37 , such as an O-ring, is in the annular groove 33e is fitted, and thereby the refrigerant can be restricted thereby, from a connecting portion between the second circular protruding portion 33d and the insertion hole 40f to lick.

The connecting section 34 has a pair of mounting holes 34a . 34b for fixing a peripheral component of the pipe joint 30 by a fastening portion, such as a bolt. The mounting holes 34a . 34b are constructed to be parallel to the protruding direction of the first and second circular portions 32c . 33d that is, the extension direction of the first and second external pipes 41 . 42 , are. For example, the peripheral component is the expansion valve 13 or similar.

The peripheral component of the pipe connection 30 is at the mounting holes 34a . 34b fixed, and thereby an element for fixing the peripheral component can be omitted. The mounting holes 34a . 34b can be made up of through holes, screw holes or the like. The peripheral component can be used without the mounting holes 34a . 34b at the connecting portion 34 be attached. For example, a pair of approximately spherical welds conventionally used may be used.

Next, a fixing method (a joining method) of the heat exchange tube will be described 20 and the pipe connection 30 with reference to 4 (a) to 4 (c) described. 4 (a) to 4 (c) FIG. 10 are schematic diagrams showing the method of attaching the heat exchange tube. FIG 20 and the pipe connection 30 demonstrate.

First, the heat exchange tube 20 and the pipe connection 30 manufactured (manufacturing process). In the manufacturing process, the outer pipe section 22 and the inner pipe section 21 that is longer than the outer tube section 22 is, for the heat exchange tube 20 produced. Then the inner pipe section 21 in the outer pipe section 22 used so that part of the inner pipe section 21 (the protruding end portion 21b ) from the end of the outer pipe section 22 protrudes.

Regarding the pipe connection 30 Be a hole that the inner pipe connection hole 32a and the through hole 33a corresponds to the outer pipe connection hole 33b , the first connection passage 32b , the second connection passage 33c , the first and second circular protruding sections 32c . 33d and the like by a drilling method, a cutting method and the like in the block-shaped main body 31 educated.

After that, a groove 35 on an outer surface of the main body 31 educated. The main body 31 becomes partially in a direction parallel to a radial direction of the hole, which is the inner pipe connection hole 32a and the through hole 33a corresponds, cut, wherein a portion of the connecting portion 34 corresponds, remains, so that the groove 35 is trained.

In this way, the first and second blocks 32 . 33 , the inner pipe connection hole 32a , the through hole 33a , the outer pipe connection hole 33b and the like is formed. The clearance with the given dimension is between the first block 32 and the second block 33 through the groove 35 provided. The manufacturing process of the heat exchange tube 20 and the pipe connection 30 is an example, and other methods may be used.

As in 4 (a) is shown, the heat exchange tube produced 20 moves along a direction indicated by the arrow and enters the pipe joint 30 used. In particular, the projecting end portion becomes 21b in the through hole 33a and the inner pipe connection hole 32a inserted, and then the end of the projecting end portion 21b in the inner pipe connection hole 32a fitted and the outer periphery of the projecting end portion 21b gets into the through hole 33a fitted. The end of the outer pipe section 22 gets into the outer pipe connection hole 33b inserted and fitted.

When the heat exchange tube 20 , as in 4 (b) shown in the pipe connection 30 is used, is the outer periphery of the projecting end portion 21b through the clearance between the first block 32 and the second block 33 free to the outside. In this state, the heat exchange tube 20 by a provisional fixing portion, such as a provisional caulking fixture (a provisional fixing method) provisionally on the pipe joint 30 attached.

The provisionally attached heat exchange tube 20 is made by brazing (a brazing method) with the pipe joint 30 connected. As in particular in 4 (c) shown, the heat exchange tube 20 and the pipe connection 30 brazed to brazing sections A to C. The brazing section A is located at a corner boundary between the inner pipe connection hole 32a and the outside circumference of the end of the protruding end portion 21b , The brazing portion B is located at a corner boundary between the through hole 33a and the outer periphery of the projecting end portion 21b , The brazing portion C is located at a corner boundary between the outer pipe connection hole 33b and the outer periphery of the end of the outer pipe section 22 ,

The heat exchange tube 20 For example, by torch soldering or furnace killing with the pipe joint 30 connected. become. When the heat exchange tube 20 by burner soldering with the pipe connection 30 An inserted brazing material or an annular pre-arranged brazing material may be used as a brazing material. When the heat exchange tube 20 by open-soldering with the pipe joint 30 is connected, an annular pre-arranged brazing material may be used as a brazing material.

As described above, according to the connection structure of the heat exchange tube 20 and the pipe connection 30 in the present embodiment, the first and second blocks 32 . 33 in the main body 31 the pipe connection 30 educated. In this way, the connecting pipe does not need the main body, the connecting pipe and the first and second connecting portions in the pipe joint as in the conventional first pipe joint 30 to be provided. The structure of the pipe connection 30 can be simplified, and the connecting sections of the heat exchange tube 20 and the pipe connection 30 can be reduced and thereby a method for airtightness testing in the connection structure can be defused.

In addition, the pipe connection 30 constructed such that a part of the projecting end portion 21b exposed to the outside, wherein the inner tube section 21 in contrast to the conventional second pipe joint with the block-shaped main body and the first and second connecting portions in the first and second blocks 32 . 33 located. Thus, when the exposed protruding end portion 21b and the first and second blocks 32 . 33 brazed, the connection sections can be visually confirmed. In addition, the terminal portions of the projecting end portion 21b and the first and second blocks 32 . 33 visually confirmed in the airtightness test.

Therefore, in the pipe joint 30 with the first block 32 that with the inner pipe section 21 connected, and the second block 33 that with the outer tube section 22 connected, the structure of the pipe joint 30 simplified and the brazing quality at the connecting sections of the inner pipe section 21 and the first and second blocks 32 . 33 can be stabilized.

If For example, burner brazing can be performed a burner can be brought directly to the connection section, and the melting state of a brazing material can be confirmed become. If furnace brazing is performed, can the connection section, even if the temperature distribution in a stove is changed visually confirmed. consequently can reduce the occurrence of faulty brazing and brazing quality can be stabilized become.

Of the Brazing section can be in the conventional second Pipe connection can not be confirmed visually. If therefore in the airtightness test, the faulty braze section is found, the erroneous section can not be corrected. In contrast, since the faulty brazing section in the Connection structure of the present embodiment visually can be confirmed, the erroneous section can be corrected become. Consequently, waste may be due to the faulty Brazing can be reduced.

In the connection structure of the present embodiment, the heat exchange tube becomes 20 only by brazing with the pipe connection 30 connected. Therefore, the fixing method can be simplified, and the occurrence of the defective brazing can be reduced as compared with a structure formed by a combination of brazing and non-brazing. The non-brazing is a method such as a diameter of a pipe in a connection hole is increased, and the pipe is fixed to the connection hole by caulking.

In in the case where the tube in the connection hole increases is and is fixed by caulking to the connection hole, is Working oil used, and one of its oil components may enter an adjacent braze section. Consequently, the attachment process becomes complex, leaving the oil component is restricted to the brazing section enter. Since it is also difficult, the oil component in the connection hole, which when enlarging the Pipe was used to completely remove in the Comparison to the structure of the present embodiment easily creates a material wetting error.

In the connection structure of the present embodiment, the margin becomes between the first block 32 and the second block 33 through the groove 35 educated. Therefore, the weight of the entire pipe joint 30 be reduced.

Second Embodiment

Next, a second embodiment of the present invention will be described with reference to FIG 5 (a) and 5 (b) described. In the following embodiments, referring to the portion corresponding to the first embodiment, the same reference number is determined, and its description will not be repeated. 5 (a) and 5 (b) are schematic diagrams showing a connection structure of the heat exchange tube 20 and the pipe connection 30 at the end of the indoor heat exchanger 16 of the present embodiment. 5 (a) is a plan view of the connection structure, and 5 (b) is one along the line VB-VB in 5 (a) taken cross-sectional view.

In the first embodiment, the flow direction of the refrigerant in the inner pipe section 21 turned 90 degrees and flows into the first external tube 41 , and the flow direction of the refrigerant in the outer pipe section 22 is rotated 90 degrees and flows through the main body 31 the pipe connection 30 in the second external pipe 42 ,

In contrast, the connection structure of the present embodiment is as in FIG 5 (a) and 5 (b) shown, constructed such that the flow direction of the refrigerant from the inner pipe section 21 to the first external pipe 41 and the flow direction of the refrigerant from the outer pipe section 22 to the second external pipe 42 are constant. That is, the flow directions are from the main body 31 the pipe connection 30 not changed.

The first circular protruding section 32c who is in the first block 32 is formed, is in the axial direction of the inner pipe connection hole 32a before, and the first connection passage 32b in the first circular projecting portion 32c and the inner pipe connection hole 32a are arranged concentrically. Consequently, the flow direction of the high pressure refrigerant passing through the first block 32 flows between the inner pipe connection hole 32a and the first circular projecting portion 32c not changed.

The second circular protruding section 33d that in the second block 33 is formed in a same direction as the protruding direction of the first circular projecting portion 32c before, and the second connection passage 33c in the second circular protruding portion 33d is parallel to the axis direction of the outer pipe connection hole 33b arranged. Consequently, the flow direction of the low pressure refrigerant passing through the second block 33 in the second circular protruding portion 33d flows, parallel to that in the outer pipe connection hole 33b ,

In the connection section 34 is a screw hole as the mounting hole 34a between the first circular protruding portion 32c and the second circular projecting portion 33d educated.

In the case where the margin between the first block 32 and the second block 33 As shown in the first embodiment, it is required to be large at the terminal portion of the projecting end portion 21b and the inner pipe connection hole 32a (the first terminal portion) arranged brazing material and that at the terminal portion of the projecting end portion 21b and the through hole 33a (the second terminal portion) are heated by the burner one after another, and the brazing materials are melted.

In the main body 31 the pipe connection 30 is a dimension of the clearance between the first block 32 and the second block 33 set small in the present embodiment. The dimension is set such that the brazing of the end of the projecting end portion 21b of the inner pipe connection hole 32a and brazing the outer periphery of the projecting end portion 21b and the through hole 33a can be done at once.

In the case where the brazing material is attached to a part of the outer periphery of the projecting end portion 21b The dimension may be set such that the brazing material disposed on the first terminal portion and the brazing material disposed on the second terminal portion can be heated at one time by a torch, and the brazing materials may be heated, which is exposed by the clearance, heated by a torch are melted. For example, the dimension is 8 mm.

As described above, the brazing of two terminal sections can be done at once, and thereby the efficiency in the brazing process can be improved.

If the first block 32 and the second block 33 by brazing with the heat exchange tube 20 be joined, the part of the outer periphery of the projecting end portion 21b , which is exposed by the clearance, completely covered by the brazing material. When a ring brazing material is used as the brazing material, the dimension can be set a little larger than a twofold wire diameter of the ring brazing material.

Consequently, when the projecting end portion 21b by brazing with the inner pipe connection hole 32a and the through hole 33a is joined, the exposed part of the outer periphery of the projecting end portion 21b covered by the molten brazing material. The corrosion resistance of the protruding end portion 21b can be improved.

In the case where, as in the present embodiment, the double pipe is used as the heat exchange pipe 20 is used is a section of the inner tube section 21 which is to be exposed to the outside, a part of the projecting end portion 21b , In this way, a material with less corrosion resistance than the material that makes up the outer tube section 22 builds up, for example copper, as the material used, which is the inner pipe section 21 builds.

A beveled section 32e is at a corner portion of the first block 32 formed, and a beveled section 33f is at a corner portion of the second block 33 educated. The corner section 33 of the first block 32 is opposite to the corner portion of the second block with a clearance therebetween 33 and the corner portions are each far from the inner pipe connection hole 32a and the through hole 33a arranged. The beveled sections 32e . 33f are constructed such that the clearance in the radial directions of the inner pipe connection hole 32a and the through hole 33a is gradually increased towards the outside.

Therefore, the terminal portions may be defined by the clearance between the first block 32 and the second block 33 beeing confirmed. For example, when torch soldering is performed, a torch may be brought to the terminal sections. The beveled sections 32e . 33f can each be at the first block 32 and the second block 33 be formed of the first embodiment.

Third Embodiment

Next, a third embodiment of the present invention will be described with reference to FIG 6 (a) to 7 (c) described. 6 (a) and 6 (b) are schematic diagrams showing a connection structure of the heat exchange tube 20 and the pipe connection 30 at the end of the indoor heat exchanger 16 of the present embodiment. 6 (a) is a plan view of the connection structure, and 6 (b) is one along the line VIB-VIB in 6 (a) taken cross-sectional view.

In the first embodiment, the pipe joint 30 from the block-shaped main body 31 with the first and second blocks 32 . 33 and the connection section 34 built up. As in 6 (a) and 6 (b) shown is the pipe connection 30 in the present embodiment, of the block-shaped first and second blocks 32 . 33 built without passing through the connecting section 34 to be connected.

In the pipe connection 30 In the present embodiment, the first block 32 and the second block 33 arranged so as to be opposite to the clearance with a predetermined dimension (W) therebetween. The dimension of the clearance between the first block 32 and the second block 33 is set small.

The dimension is set such that the brazing of the end of the projecting end portion 21b and the inner pipe connection hole 32a and brazing the outer periphery of the projecting end portion 21b and the through hole 33a as in the second embodiment can be performed simultaneously.

Further, if the first and second blocks 32 . 33 by brazing with the heat exchange tube 20 be joined, the part of the outer periphery of the projecting end portion 21b , which is exposed by the clearance, completely covered by the brazing material.

Next, an attachment method of the heat exchange tube will be described 20 and the pipe connection 30 with reference to 7 (a) to 7 (c) described. 7 (a) to 7 (c) FIG. 10 are schematic diagrams showing the method of attaching the heat exchange tube. FIG 20 and the pipe connection 30 demonstrate.

First, the heat exchange tube 20 and the pipe connection 30 manufactured (a manufacturing process). In the manufacturing process, the first and second blocks become 32 . 33 for the pipe connection 30 produced.

The inner pipe connection hole 32a , the first connection passage 32b , the first circular protruding section 32c and the like will be in the first block 32 formed, and the through hole 33a , the outer pipe connection hole 33b , the second connection passage 33c , the second circular protruding section 33d and the like are made by a drilling method, a cutting method and the like in the second block 33 educated. The first and second blocks 32 . 33 are arranged separately such that a surface of the first block 32 on which the inner pipe connection hole 32a is formed opposite to a surface of the second block 33 , on the the through hole 33a is formed, is formed.

Then, as in 7 (a) shown the heat exchange tube 20 moves along a direction indicated by the arrow and enters the pipe joint 30 used. In particular, the projecting end portion becomes 21b in the through hole 33a and the inner pipe connection hole 32a inserted, and then the end of the projecting end portion 21b in the inner pipe connection hole 32a fitted, and the outer periphery of the projecting end portion 21b gets into the through hole 33a fitted. The end of the outer pipe section 22 gets into the outer pipe connection hole 33b inserted and fitted.

As in 7 (b) shown is the margin between the first block 32 and the second block 33 set small, with the heat exchange tube 20 in the pipe connection 30 is used. The part of the outer periphery of the protruding end portion 21b along its axis direction is exposed to the outside. In this state, the heat exchange tube 20 by a provisional fixing portion, such as a provisional Verstemmbefestigung (a provisional fixing method), temporarily at the pipe joint 30 attached.

The provisionally attached heat exchange tube 20 is made by brazing (a brazing method) with the pipe joint 30 connected. As in particular in 7 (c) shown, the heat exchange tube 20 and the pipe connection 30 brazed to brazing sections D and E. The brazing section D extends from a corner boundary between the inner pipe connection hole 32a and the outer periphery of the end of the projecting end portion 21b up to a corner boundary between the through hole 33a and the outer periphery of the projecting end portion 21b , The brazing section E is located at a corner boundary between the outer pipe connection hole 33b and the outer periphery of the end of the outer pipe section 22 ,

The clearance is set small, so that the brazing of the brazing section D can be performed at one time. Consequently, in the present embodiment, the heat exchange tube 20 and brazed the pipe joint only at the braze sections D and E.

According to the present embodiment, the connection structure of the heat exchange tube 20 and the pipe connection 30 can be simplified, and the brazing quality at the brazing sections can be stabilized as in the first and second embodiments.

By simultaneously brazing the connection sections between the inner pipe section 21 and the first block 32 and the second block 33 the efficiency in the brazing process can be improved. Furthermore, the material that the inner tube section 21 builds up, has a lower corrosion resistance than the material that the outer pipe section 22 builds.

Although the first block 32 not through the connecting section 34 in the pipe connection 30 with the second block 33 connected, the first block 32 through the molten brazing material in the small clearance with the second block 33 get connected. Because the connecting section 34 does not need to be provided, the weight of the pipe joint 30 of the present embodiment can be lowered as compared with that of the first embodiment.

Fourth Embodiment

Next, a fourth embodiment of the present invention will be described with reference to FIG 8th to 9 (b) described. 8th is a perspective view of the heat exchange tube 20 of the present embodiment. 9 (a) and 9 (b) are schematic diagrams showing a connection structure of the heat exchange tube 20 and the pipe connection 30 at the end of the indoor heat exchanger 16 of the present invention. 9 (a) is a plan view of the connection structure, and 9 (b) is one along the line IXB-IXB in 9 (a) taken cross-sectional view.

In the first to third embodiments, the heat exchange tube 20 of the indoor heat exchanger 16 , as in 3 shown from the double pipe with the inner pipe section 21 and the outer tube section 22 built up. The double piping is constructed so as to be able to exchange heat between the high-pressure refrigerant and the low-pressure refrigerant.

In the present embodiment, the heat exchange tube is 20 constructed such that the first pipe section 21 (also referred to herein as a high pressure pipe section in the present embodiment) through which the high pressure refrigerant flows, parallel to the second pipe section 22 (hereinafter also referred to as a low-pressure pipe section in the present embodiment) through which the low-pressure refrigerant flows, and that the high-pressure refrigerant can exchange heat with the low-pressure refrigerant.

As in particular in 8th shown is the heat exchange tube 20 from a flat tube (the its cross-section has a flat shape), in which the high-pressure pipe section 21 and the low pressure pipe section 22 are integrally formed, and thereby the high-pressure refrigerant can exchange heat with the low-pressure refrigerant.

Hereinafter, the connection structure of the heat exchange tube 20 and the pipe connection 30 at the end of the indoor heat exchanger 16 described.

The end of the indoor heat exchanger 16 is from the heat exchange tube 20 and with the end of the heat exchange tube 20 connected pipe connection 30 built up.

Multiple through holes as the first fluid passage 21a through which the high-pressure refrigerant flows are in the high-pressure pipe section 21 (one in 8th shown lower pipe section) formed. Multiple through holes as the second fluid passage 22a through which the low-pressure refrigerant flows are in the low-pressure pipe section 22 (one in 8th shown upper portion) is formed. The high pressure pipe section 21 and the low pressure section 22 are constructed such that they are capable of passing through a wall which forms the first fluid passage 21a and the second fluid passage 22a separates heat between the high pressure refrigerant in the first fluid passage 21a and the low pressure refrigerant in the second fluid passage 22a exchange. In particular, the plurality of through holes are the first fluid passage 21a in the high pressure pipe section 21 arranged in the width direction, and the plurality of through holes as the second fluid passage 22a are in the low pressure pipe section 22 arranged in the width direction. The width direction of the high-pressure pipe section 21 is parallel to the width direction of the low pressure pipe section 22 ,

A length of the high-pressure pipe section 21 is larger in the longitudinal direction (ie, in the direction of the refrigerant flow) than that of the low-pressure pipe section 22 , That is, a length of the in the high-pressure pipe section 21 formed first fluid passage 21a is longer than that in the low pressure section 22 formed second fluid passage 22a ,

Consequently, there is an end of the high-pressure pipe section 21 from one end of the low pressure pipe section 22 in the longitudinal direction outwards, wherein the high-pressure pipe section 21 with the low pressure pipe section 22 connected is. A section of the high pressure section 21 from the end of the low pressure pipe section 22 protrudes, is the protruding end portion 21b ,

The pipe connection 30 The present embodiment is made of the block-shaped main body 31 built with the ends of the high-pressure pipe section 21 and the low pressure pipe section 22 connected is. The main body 31 is integral with the first and second blocks 32 . 33 and the connection section 34 built up.

The first block 32 has the first connection hole 32a on a surface opposite to the second block 33 is. The first connection hole 32a is formed around the end of the projecting end portion 21b and the first block 32 connect to. The first connection hole 32a has a hole diameter sufficient to the outer periphery of the projecting end portion 21b to fit in it.

The second block 33 has the second connection hole 33a on a surface opposite to the first block 32 is. The second connection hole 33a is formed around the projecting end portion 21b and the second block 33 with the protruding end portion 21b to connect, which in the second connection hole 33a located after the protruding end portion 21b the second connection hole 33a penetrates. The second connection hole 33a is a through hole, which is the second block 33 penetrates. The second connection hole 33a has a hole diameter sufficient to fit therein the outer periphery of the projecting end portion 21b fit.

Besides, the second block has 33 the third connection hole 33b on an opposite surface of the surface leading to the first block 32 is opposite. The third connection hole 33b is designed to the low pressure pipe section 22 and the second block 33 with the low pressure pipe section 22 that is in the third connection hole 33b is to connect. The third connection hole 33b has a hole diameter sufficient to an outer periphery of the heat exchange tube 20 to fit in it.

The second and third connection holes 33a . 33b open as a connection hole on the opposite surface of the surface leading to the first block 32 is opposite. That is, the heat exchange tube 20 is with the second block 33 connected, wherein the heat exchange tube 20 in the second and third connection holes 33a . 33b located.

The heat exchange tube 20 gets into the first and second blocks 32 . 33 used. Then the heat exchange tube 20 and the pipe connection 30 brazed to the braze sections F to H. The brazing portion F is located at a corner boundary between the projecting end portion 21b and the first connection hole 32a , The brazing portion G is located at a corner boundary between the projecting end portion 21b and the second connection hole 33a , The brazing portion H is located at a corner boundary between the third terminal hole 33b and the high pressure pipe section 21 , the Niederduckrohrabschnitt 22 ,

In the connection structure of the present embodiment, the brazing portions F and G may be defined by the clearance between the first block 32 and the second block 33 be visually confirmed from the outside.

Consequently, when the heat exchange tube 20 and the pipe connection 30 brazing at the brazing sections F and G, the brazing state can be visually confirmed from outside. Since the brazing portion H is exposed to the outside, the brazing state can be visually confirmed from outside.

Therefore, if the indoor heat exchanger 16 from the in 8th shown heat exchange tube 20 is constructed, the connection structure of the heat exchange tube 20 and the pipe connection 30 can be simplified, and the brazing quality at the brazing sections can be stabilized as in the first to third embodiments.

Other Embodiments

• (1) The heat exchange tube 20 is constructed of the double pipe or the flat tube in the first to fourth embodiments. However, the heat exchange tube is 20 not limited to this. As long as the heat exchange tube is formed such that a length of a tube in a longitudinal direction is larger than that of another tube, a heat exchange tube may be used in which an outer periphery of a first tube section is in contact with an outer periphery of a second tube section. In the heat exchange tube, a fluid flowing in the first tube section exchanges heat with a fluid flowing in the second tube section. Further, a cross section of the heat exchange tube 20 in a direction perpendicular to the refrigerant flow direction is not limited to a circular shape. A heat exchange tube having a flat cross section, a rectangular cross section or the like may be used.
• (2) The from the inner pipe section 21 and the outer tube section 22 constructed double pipeline, the in 3 is shown as the heat exchange tube in the first to third embodiments 20 used. However, the double pipe is not limited to this. Like in 10 shown, the inner tube section 21 , the outer pipe section 22 and a connecting bridge 20a for connecting the inner pipe section 21 and the outer pipe section 22 formed integrally by an extrusion process. In this case, the outer pipe section 22 and the connecting bridge 20a be removed at one end of the double pipe by cutting, so that the projecting end portion 21b is trained.

The shapes of the inner pipe section 21 and the outer pipe section 22 are not limited to cylindrical shapes. Like in 11 shown, the cylindrical inner tube section 21 with a spiral groove 21c be used. A polygon tube, such as a trigonal tube, may be used. In this case, the low-pressure refrigerant in the inner pipe section 21 flow, and the high-pressure refrigerant can in the outer pipe section 22 stream. Conversely, the high-pressure refrigerant in the inner pipe section 21 flow, and the low-pressure refrigerant can in the outer pipe section 22 stream.

• (3) Eine Länge des Hochdruckrohrabschnitts 21 ist in der Längsrichtung größer als die des Niederdruckrohrabschnitts 22, das heißt, das Ende des Hochdruckrohrabschnitts 21 entspricht dem vorstehenden Endabschnitt 21b in der vierten Ausführungsform. Jedoch ist die Struktur nicht darauf beschränkt. Zum Beispiel kann eine Länge eines Niederdruckrohrabschnitts größer als die eines Hochdruckrohrabschnitts sein, das heißt, ein Ende des Niederdruckrohrabschnitts kann als ein vorstehender Endabschnitt verwendet werden.
• (4) Der erste Block 32, der zweite Block 33 und der Verbindungsblock 34 sind in den ersten, zweiten und vierten Ausführungsformen integral in dem Hauptkörper 31 ausgebildet. Jedoch ist die Struktur nicht darauf beschränkt. Zum Beispiel kann ein getrennt ausgebildeter Verbindungsabschnitt 34 zwischen dem ersten Block 32 und dem zweiten Block 33 angeordnet werden, und der Verbindungsblock 34 und die ersten und zweiten Blöcke 32, 33 können von einem Befestigungsabschnitt, wie etwa einem Bolzen, befestigt werden.
• (5) Ein Befestigungsloch 34a ist in der zweiten Ausführungsform in dem Verbindungsabschnitt 34 ausgebildet. Jedoch ist die Struktur nicht darauf beschränkt. Das Befestigungsloch 34a kann ausgebildet werden, um zu einer Form einer peripheren Komponente der Rohrverbindung 30 oder ähnlichem zu passen.

The heat exchange tube 20 is not limited to the double pipe. The heat exchange tube 20 may be constructed of a multiple tube, such as a triple tube and a quad tube. In this case, a length of an inner pipe section in a longitudinal direction is set larger than that of an outer pipe section and the pipe joint 30 can be constructed such that such connection portions of the pipe joint 30 and the respective tubes exposed to the outside.

• (3) A length of the high-pressure pipe section 21 is larger in the longitudinal direction than that of the low-pressure pipe section 22 that is, the end of the high-pressure pipe section 21 corresponds to the protruding end portion 21b in the fourth embodiment. However, the structure is not limited to this. For example, a length of a low-pressure pipe section may be larger than that of a high-pressure pipe section, that is, one end of the low-pressure pipe section may be used as a protruding end section.
• (4) The first block 32 , the second block 33 and the connection block 34 are integral in the main body in the first, second and fourth embodiments 31 educated. However, the structure is not limited to this. For example, a separately formed connection section 34 between the first block 32 and the second block 33 be arranged, and the connection block 34 and the first and second blocks 32 . 33 can be fastened by a fastening portion, such as a bolt.
• (5) A mounting hole 34a is in the connecting portion in the second embodiment 34 educated. However, the structure is not limited to. The mounting hole 34a may be formed to a shape of a peripheral component of the pipe joint 30 or similar.

Like in 12 (a) and 12 (b) shown, the pair of mounting holes 34a . 34b between the first circular protruding portion 32c and the second circular projecting portion 33d be formed. 12 (a) is a plan view of a connection structure, and 12 (b) is one along the line XIIB-XIIB in 12 (a) taken cross-sectional view. As in 12 (a) shows a direction of arrangement of the mounting holes intersects 34a . 34b an arrangement direction of the first and second circular projecting portions 32c . 33d ,

• (6) Die aufzunehmenden ersten und zweiten kreisförmigen vorstehenden Abschnitte 32c, 33d sind in den vorstehend beschriebenen Ausführungsformen derart in dem Hauptkörper 31 ausgebildet, dass die ersten und zweiten externen Rohre 41, 42 mit der Rohrverbindung 30 verbunden sind. Die Struktur ist jedoch nicht darauf beschränkt. Wie zum Beispiel in 14(a) und 14(b) gezeigt, können die aufnehmenden Einsetzlöcher 32f, 33g zum Einpassen der ersten und zweiten externen Rohre 41, 42 darin ausgebildet sein. 14(a) ist eine Draufsicht einer Verbindungsstruktur, und 14(b) ist eine entlang der Linie XIVB-XIVB in 14(a) genommene Querschnittansicht.
• (7) Die vorliegende Erfindung wird auf den Innenwärmetauscher 16 der unterkritischen Kältekreislaufvorrichtung 10 angewendet, in welcher eine Alternative zu CFC als ein Kältemittel in einem Kältekreislauf in den vorstehend beschriebenen Ausführungsformen verwendet wird. Jedoch ist die Kältekreislaufvorrichtung nicht darauf beschränkt. Die vorliegende Erfindung kann auf den Innenwärmetauscher 16 einer überkritischen Kältekreislaufvorrichtung 10 angewendet werden, in welcher Kohlendioxid oder ähnliches als ein Kältemittel in einer Kältekreislaufvorrichtung verwendet wird.
• (8) Die Verbindungsstruktur des Wärmeaustauschrohrs 20 und der Rohrverbindung 30 wird in dem Innenwärmetauscher 16 der Kältekreislaufvorrichtung 10 für ein Fahrzeug verwendet. Jedoch kann die Verbindungsstruktur für andere Komponenten verwendet werden.

As in 13 (a) and 13 (b) shown, the pair of mounting holes 34a . 34b be formed so that it is parallel to the arrangement direction of the first and second circular protruding portions 32c . 33d is. The above modified example of the mounting holes 34a . 34b can be applied to the first and fourth embodiments. 13 (a) is a plan view of a connection structure, and 13 (b) is one along the line XIIIB-XIIIIB in 13 (a) taken cross-sectional view.

• (6) The male first and second circular protruding portions 32c . 33d are in the main body in the above-described embodiments 31 formed that the first and second external pipes 41 . 42 with the pipe connection 30 are connected. However, the structure is not limited to this. Like in 14 (a) and 14 (b) shown, the female insertion holes 32f . 33g for fitting the first and second external pipes 41 . 42 be formed therein. 14 (a) is a plan view of a connection structure, and 14 (b) is one along the line XIVB-XIVB in 14 (a) taken cross-sectional view.
• (7) The present invention is applied to the indoor heat exchanger 16 the subcritical refrigeration cycle device 10 is applied, in which an alternative to CFC is used as a refrigerant in a refrigeration cycle in the embodiments described above. However, the refrigeration cycle device is not limited to this. The present invention can be applied to the indoor heat exchanger 16 a supercritical refrigeration cycle device 10 in which carbon dioxide or the like is used as a refrigerant in a refrigeration cycle device.
• (8) The connection structure of the heat exchange tube 20 and the pipe connection 30 is in the indoor heat exchanger 16 the refrigeration cycle device 10 used for a vehicle. However, the connection structure can be used for other components.

While the invention with reference to its preferred embodiments It is understood that the invention is not limited to the limited to preferred embodiments and structures is. The invention is intended to be various modifications and equivalent Cover arrangements. There are also several Combinations and configurations that are preferred, others as well Combinations and superstructures, including more, less or a single element, within the mind and sphere of the Invention.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - JP 2001-235081 A [0002, 0002, 0003]
• - JP 2006-003071 A [0002, 0002, 0005]

Claims (13)

Pipe connection ( 30 ) fitted with a heat exchange tube ( 20 ), which has a first pipe section ( 21 ), through which a first fluid flows, and a second pipe section ( 22 ), through which a second fluid flows, wherein the first tube section ( 21 ) and the second pipe section ( 22 ) are arranged such that the first fluid is capable of exchanging heat with the second fluid, wherein the first tube section ( 21 ) a projecting end portion ( 21b ) from one end of the second pipe section ( 22 ) in a longitudinal direction of the second pipe section ( 22 ), wherein the pipe connection ( 30 ) comprises: a first block ( 32 ) with a first connection hole ( 32b ), which is suitable with the first pipe section ( 21 ), so that the first fluid through the first communication hole ( 32b ) flows; and a second block ( 33 ) with a second connection hole ( 33c ), which is suitable with the second pipe section ( 22 ), so that the second fluid through the second communication hole ( 33c ), the first block ( 32 ) is arranged such that it has a clearance of a predetermined dimension therebetween opposite to the second block (FIG. 33 ), the first block ( 32 ) a first connection hole ( 32a ) on a surface of the first block ( 32 ) as opposed to the second block ( 33 ), so that the heat exchange tube ( 20 ) with the first block ( 32 ), the projecting end portion ( 21a ) near its end, which is in the first connection hole ( 32a ) is the second block ( 33 ) a second connection hole ( 33a ) on a surface of the second block ( 33 ), which are opposite to the first block ( 32 ), and a third connection hole ( 33b ) on one to the second block ( 33 ) has opposite surface, so that the heat exchange tube ( 20 ) with the second block ( 33 ), the projecting end portion ( 21b ) in the second connection hole ( 33a ) and the second pipe section ( 22 ) in the third connection hole ( 33b ), and at least a first terminal portion of the projecting end portion (FIG. 21b ) and the first connection hole ( 32a ) located at a first position near the end of the projecting end portion (Fig. 21b ), and a second terminal portion of the projecting end portion (FIG. 21b ) and the second connection hole ( 33a ) located at a second position spaced from the first position, are exposed to the outside through the clearance when the projecting end portion (FIG. 21b ) in the first and second connection holes ( 32a . 33a ) and the second pipe section ( 22 ) in the third connection hole ( 33b ) is located. Pipe connection ( 30 ) according to claim 1, further comprising: a connecting portion ( 34 ), the first block ( 32 ) and the second block ( 33 ) connects. Pipe connection ( 30 ) according to claim 1 or 2, wherein the predetermined dimension is set small, so that the brazing of the first terminal portion and the brazing of the second terminal portion can be performed at once. Pipe connection ( 30 ) according to any one of claims 1 to 3, further comprising: a first bevelled portion ( 32e ) at a corner portion of the first block ( 32 ) and a second bevelled section ( 33f ) at a corner portion of the second block ( 33 ), wherein the corner portion of the first block ( 32 ) with a clearance therebetween opposite to the corner portion of the second block ( 33 ). Pipe connection ( 30 ) according to any one of claims 1 to 4, wherein the clearance between the first block ( 32 ) and the second block ( 33 ) is provided so that it the first connection hole ( 32a ) and the second connection hole ( 33a ) interspersed. Pipe connection ( 30 ) according to any one of claims 1 to 5, wherein the second pipe section ( 22 ) on an outer peripheral side of the first pipe section ( 21 ) is located. Pipe connection ( 30 ) according to any one of claims 1 to 5, wherein a plurality of through holes ( 21a ) in the first pipe section ( 21 ) in a width direction of the first pipe section (FIG. 21 ) are arranged, and a plurality of through holes ( 22a ) in the second pipe section ( 22 ) in a width direction of the second pipe section (FIG. 22 ) are arranged, and the width direction of the first pipe section ( 21 ) parallel to the width direction of the second pipe section ( 22 ). Connection structure, comprising: a heat exchange tube ( 20 ) with a first pipe section ( 21 ), through which a first fluid flows, and a second pipe section ( 22 ), through which a second fluid flows, wherein the first pipe section ( 21 ) and the second pipe section ( 22 ) are arranged such that the first fluid is capable of exchanging heat with the second fluid; and a pipe connection ( 30 ) connected to the heat exchange tube ( 20 ), wherein the first pipe section ( 21 ) a projecting end portion ( 21b ) from one end of the second pipe section ( 22 ) in a longitudinal direction of the second pipe section ( 22 ), wherein the pipe connection ( 30 ) comprises: a first block ( 32 ) with a first connection hole ( 32b ), which is suitable with the first pipe section ( 21 ), so that the first fluid through the first communication hole ( 32b ) flows; a second block ( 33 ) with a second connection hole ( 33c ), which is suitable with the second pipe section ( 22 ), so that the second fluid through the second communication hole ( 33c ) flows; and a connecting section ( 34 ), the first block ( 32 ) and the second block ( 33 ), the first block ( 32 ) is arranged such that it has a clearance of a predetermined dimension therebetween opposite to the second block (FIG. 33 ), the first block ( 32 ) a first connection hole ( 32a ) on a surface of the first block ( 32 ) as opposed to the second block ( 33 ), so that the heat exchange tube ( 20 ) with pipe connection ( 30 ), the projecting end portion ( 21a ) near its end, which is in the first connection hole ( 32a ), the second block ( 33 ) a second connection hole ( 33a ) on a surface of the second block ( 33 ), which are opposite to the first block ( 32 ), and a third connection hole ( 33b ) on one to the second block ( 33 ) has opposite surface, so that the heat exchange tube ( 20 ) with the pipe connection ( 30 ), the projecting end portion ( 21b ) in the second connection hole ( 33a ) and the second pipe section ( 22 ) in the third connection hole ( 33b ), and at least a first terminal portion of the projecting end portion (FIG. 21b ) and the first connection hole ( 32a ) located at a first position near the end of the projecting end portion (Fig. 21b ), and a second terminal portion of the projecting end portion (FIG. 21b ) and the second connection hole ( 33a ) located at a second position spaced from the first position, are exposed to the outside through the clearance when the projecting end portion (FIG. 21b ) in the first and second connection holes ( 32a . 33a ) and the second pipe section ( 22 ) in the third connection hole ( 33b ) is located. Connection structure according to claim 8, wherein the heat exchange tube ( 20 ) by brazing with the pipe joint ( 30 ), so that a part of an outer periphery of the protruded end portion exposed by the clearance (FIG. 21b ) is completely covered by a brazing material. Connecting structure according to claim 8 or 9, wherein the heat exchange tube ( 20 by brazing at the first connection portion, the second connection portion and a third connection portion of the second pipe portion (FIG. 22 ) and the third connection hole ( 33b ) with the pipe connection ( 30 ) connected is. Method for connecting the heat exchange tube ( 20 ) and the pipe connection ( 30 ) according to any one of claims 8 to 10, comprising: manufacturing the heat exchange tube ( 20 ) and the pipe connection ( 30 ); provisional fixing of the heat exchange tube ( 20 ) at the pipe connection ( 30 ), wherein the projecting end portion ( 21a ) near its end, which is in the first connection hole ( 32a ), and wherein the projecting end portion ( 21a ) in the second connection hole ( 33a ) and the second pipe section ( 22 ) in the third connection hole ( 33b ) is located; and after provisional fixing brazing the heat exchange tube ( 20 ) and the pipe connection ( 30 ) at the first terminal portion, the second terminal portion and the third terminal portion. Connection structure, comprising: a heat exchange tube ( 20 ) with a first pipe section ( 21 ), through which a first fluid flows, and a second pipe section ( 22 ), through which a second fluid flows, wherein the first tube section ( 21 ) and the second pipe section ( 22 ) are arranged such that the first fluid is capable of exchanging heat with the second fluid; and a pipe connection ( 30 ) connected to the heat exchange tube ( 20 ), wherein the first pipe section ( 21 ) a projecting end portion ( 21b ) from one end of the second pipe section ( 22 ) in a longitudinal direction of the second pipe section ( 22 ) protruding whereby the pipe connection ( 30 ) comprises: a first block ( 32 ) with a first connection hole ( 32c ), which is suitable with the first pipe section ( 21 ), so that the first fluid through the first communication hole ( 32b ) flows; and a second block ( 33 ) with a second connection hole ( 33c ), which is suitable with the second pipe section ( 22 ), so that the second fluid through the second communication hole ( 33c ), the first block ( 32 ) is arranged such that it has a clearance of a predetermined dimension therebetween opposite to the second block (FIG. 33 ). the first block ( 32 ) a first connection hole ( 32a ) on a surface of the first block ( 32 ) as opposed to the second block ( 33 ), so that the heat exchange tube ( 20 ) with the pipe connection ( 30 ), the projecting end portion ( 21a ) near its end, which is in the first connection hole ( 32a ), the second block ( 33 ) a second connection hole ( 33a ) on a surface of the second block ( 33 ), which are opposite to the first block ( 32 ), and a third connection hole ( 33b ) on one to the second block ( 33 ) has opposite surface, so that the heat exchange tube ( 20 ) with the pipe connection ( 30 ), the projecting end portion ( 21b ) in the second connection hole ( 33a ) and the second pipe section ( 22 ) in the third connection hole ( 33b ), at least a first terminal portion of the projecting end portion ( 21b ) and the first connection hole ( 32a ) located at a first position near the end of the projecting end portion (Fig. 21b ), and a second terminal portion of the projecting end portion (FIG. 21b ) and the second connection hole ( 33a ) located at a second position spaced from the first position, are exposed to the outside through the clearance when the projecting end portion (FIG. 21b ) in the first and second connection holes ( 32a . 33a ) and the second pipe section ( 22 ) in the third connection hole ( 33b ), and the predetermined dimension is set small, so that the brazing of the first terminal portion and the brazing of the second terminal portion can be performed at once. Method for connecting the heat exchange tube ( 20 ) and the pipe connection ( 30 ) according to claim 12, comprising: manufacturing the heat exchange tube ( 20 ) and the pipe connection ( 30 ); Arrange the first block ( 32 ) and the second block ( 33 ) with the little margin in between; provisional fixing of the heat exchange tube ( 20 ) at the pipe connection ( 30 ), wherein the projecting end portion ( 21a ) near its end, which is in the first connection hole ( 32a ), and the projecting end portion ( 21a ) in the second connection hole ( 33a ) and the second pipe section ( 22 ) in the third connection hole ( 33b ) is located; and brazing the heat exchange tube ( 20 ) and the pipe connection ( 30 ) at the first connection section, the second connection section and a third connection section of the second pipe section ( 22 ) and the third connection hole ( 33b ) after provisional fixing.