CN1773206A - Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same - Google Patents
Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same Download PDFInfo
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- CN1773206A CN1773206A CN 200510120281 CN200510120281A CN1773206A CN 1773206 A CN1773206 A CN 1773206A CN 200510120281 CN200510120281 CN 200510120281 CN 200510120281 A CN200510120281 A CN 200510120281A CN 1773206 A CN1773206 A CN 1773206A
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Abstract
A double-wall pipe includes an outer pipe (162) and an inner pipe (162) arranged internal of the outer pipe. The outside wall of the inner pipe has a ridge portion (162b) for determining a groove portion (162a) extending along the longitudinal of the inner pipe. The outer pipe and the inner pipe are bent so as to have a right straight extension straight portion (163a) and a bending portion (163b) bending from the straight portion. In the straight portion, the inner diameter (L) of the outer pipe is bigger than the outer diameter (L(R)) of a hypothesis cylinder determined by the outside surface of the ridge. Furthermore, the ridge of the inner pipe contacts to the inner surface of the outer pipe so as to laterally extrude and remain at bending portion by the outer pipe. The double-wall pipe is suitable for refrigerant circulating device.
Description
Technical field
The present invention relates to a kind of at least a portion and determine double-wall pipe and a kind of method of making double-wall pipe that the outer tube of external path constitutes together by pipe in the Guan Yiyu in the interior pipe of determining internal path and the encirclement.This double-wall pipe can be applicable to refrigerant cycle apparatus.
Background technology
The interior pipe of the interior Guan Yiyu of pipe and encirclement was determined the outer tube of path together in disclosed double-wall pipe comprised among the JP-A-2002-318083.Heat exchange between second fluid of the first fluid that flows in the pipe in this double-wall pipe can be realized and the path between interior pipe and the outer tube of flowing through.
Be provided with the core that remains in the outer tube in the part of this double-wall pipe, and interior Guan Jingxin extends.The part that is equipped with the core of double-wall pipe uses bending machine to pass through the BENDING PROCESS bending to form bend.Bend forms by BENDING PROCESS, thereby can not form straight line in bend, and bend can not be irregular bending, and the section of double-wall pipe can not be smooth.
Because interior pipe and outer tube are gapped at interval, when external force was applied on the double-wall pipe, interior pipe and outer tube may vibrate each other, resonate, collide, and produced noise.
Summary of the invention
Consider the problems referred to above, one object of the present invention is to provide the double-wall pipe of the path between a kind of interior pipe with outer tube and outer tube inside, and it utilizes simple structure to keep and fixedly outer tube and interior pipe.
Another object of the present invention is to provides: a kind of method of making double-wall pipe; With a kind of refrigerant cycle apparatus that uses double-wall pipe.
According to an aspect of the present invention, in the double-wall pipe that comprises outer tube and the interior pipe that is arranged on outer tube inside, interior pipe has the spine that determines the slot part that extends along the longitudinal direction of interior pipe thereon, and outer tube and interior pipe are bent with straight portion with honest extension with from the bend of straight portion bending.In addition, in straight portion, outer tube has the bigger internal diameter of external diameter than the imaginary cylinder of being determined by the outer surface of the spine of interior pipe; And at bend, the inner surface of the spine of interior pipe contact outer tube is radially to be pushed by outer tube and to keep.For example, slot part is the spiral slot part that twines around interior pipe.
Therefore, in bend, slot part forms the path between outer tube and the interior pipe, and the part of the part of outer tube and interior pipe can utilize simple structure to be remained in the bend regularly.Therefore, even when the external force such as vibration force is applied on the double-wall pipe, can prevents the resonance of exterior tube and inner tube, and can prevent breaking of generating noise and double-wall pipe.
In helicla flute is set on the outer surface of pipe the time, helicla flute reduced the strain in the bend and help crooked in pipe.In this case, the required power of crooked double-wall pipe can be reduced effectively.
For example, the spiral slot part comprises a plurality of helicla flutes.In this case, even destroyed at bend when a helicla flute, all the other helicla flutes also can be used in the path that forms between outer tube and the interior pipe.Because helicla flute enlarged path, so can reduce the flow through resistance of path of fluid.
For example, the groove depth of this slot part is in 5% to 15% scope of the external diameter of interior pipe.In this case, the heat exchange between the fluid of the path at the fluid of interior pipe inside and in flowing through between pipe and the outer tube can increase effectively, can reduce flow resistance simultaneously.
The flow resistance of the fluid that flows in the internal pipe of interior pipe and the length of interior pipe increase pro rata.In addition, the fluid that in interior pipe, flows with flow through in manage and outer tube between the fluid of path between temperature difference reduce along with the increase of slot part length.When the longitudinal length of slot part is set at 300mm in the scope of 800mm the time, rate of heat exchange can be effectively improved.In addition, the spiral fluted longitudinal length can be set in the scope between 600mm and the 800mm.
In the external diameter of outer tube can be set in 1.1 to 1.3 times the scope of external diameter of pipe.When pipe was bent, tension force acted on the outside of pipe and the length in the outside increases.Therefore, the external diameter of pipe reduces 10 to 30%.Therefore, the internal diameter of outer tube reduces 10 to 30%.In this case, outer tube and interior pipe can be fixed together reliably.
In addition, the minimum outer diameter of the outer tube in bend can be set up 0.85 times of the external diameter that is equal to or greater than straight portion middle external tube.In this case, the circular cross section of outer tube is deformed into the elliptical section of bend can be controlled, can be controlled to the extensional of bend by the high-pressure fluid of the path of the inside of the outer tube of flowing through; The strain energy of outer tube accesses inhibition; And can prevent breaking of outer tube.
The external diameter of the ideal cylinder of being determined by the outer surface of the spine of pipe in the straight portion can be set in 0.7 to 0.95 the scope of internal diameter of the outer tube in the straight portion.
When double-wall pipe was bent 10 ° or above angle, the minimum diameter of bend middle external tube was below 70% or 70% of initial internal diameter.Therefore, when the cylindrical diameter of being determined by the outer surface of spine of circular virtual is 70% or 70% when above of initial internal diameter of outer tube, outer tube and interior pipe can be fixed together reliably at bend, and double-wall pipe can be resisted vibration.When outer tube did not have very high straightness, interior pipe is difficult to insert outer tube, and double-wall pipe Production Line rate descends.Therefore, expectation is: the external diameter of the imaginary cylinder of being determined by the outer surface of the spine of interior pipe is below 95% or 95% of internal diameter of outer tube.
Branched pipe can be connected to outer tube, and tube connector can be connected to the end of interior pipe.In this case, use holding member, branched pipe and tube connector can be fixed to have predetermined location relationship.In addition, holding member can be soldered to branched pipe and tube connector, or is fitted to branched pipe and tube connector.In addition, branched pipe can be configured to have the deformable part of the terminal position that is used to regulate branched pipe.For example, deformable part is the bend that is arranged in the branched pipe.
This double-wall pipe can be applicable to the refrigerant cycle apparatus with one or two refrigerant loop.
According to a further aspect in the invention, a kind of method of making hot double-wall pipe comprises: form the slot part that extends along the longitudinal direction on the outer wall of pipe so that form the step of the spine that determines slot part thereon; After forming slot part, interior pipe inserted the step in the outer tube with internal diameter bigger than the external diameter of the imaginary cylinder of determining by the outer surface of the spine of interior pipe; With after inserting step, crooked in the part of pipe and outer tube, with pipe in the surface, inside of spine's contact outer tube and the outer tube radial compression in bend, to keep and fixing wherein the mode of interior pipe the step of formation bend.In this case, double-wall pipe can easily form.
In the formation step of slot part,, can form the helicla flute of the slot part that extends spirally along the longitudinal direction by outer wall inner radial distortion at interior pipe.
Description of drawings
By the following detailed description to preferred embodiment, it is more obvious that above and other objects of the present invention, characteristic and advantage will become with reference to accompanying drawing, wherein:
Fig. 1 is the schematic diagram of automotive air-conditioning system;
Fig. 2 is the double-wall pipe side view in according to a preferred embodiment of the present invention;
Fig. 3 is the view profile of the part III among Fig. 2;
Fig. 4 is the cross-sectional view strength along the straight line IV-IV among Fig. 3;
Fig. 5 is the view profile of the part of V among Fig. 2;
Fig. 6 is the cross-sectional view strength along the straight line VI-VI among Fig. 5;
Fig. 7 shows the perspective view that is used for forming on inner pipe the spiral fluted grooving apparatus;
Fig. 8 is the Mollier curve that is used to illustrate the refrigerating circulatory device that uses double-wall pipe;
Fig. 9 is the curve that shows with respect to the correlation of the coefficient of overall heat transmission and pressure loss in the low-voltage tube of the spiral fluted degree of depth and spacing;
Figure 10 shows with respect to spiral fluted length the curve of the variation of refrigerating capacity, the coefficient of overall heat transmission and pressure loss in the low-voltage tube;
Figure 11 A is the curve that concerns between the variation that shows the internal diameter L of outer tube changes with angle of bend; And Figure 11 B shows the curve that concerns between ratio L (R)/L of the external diameter L (R) of helicla flute pitch and the ideal cylinder of the outer surface of the ridge that is connected interior pipe and outer tube inside diameter L;
Figure 12 is the curve that shows resonant frequency and keep concerning between the spacing;
Figure 13 A and 13B are the side views that shows fixed part respectively;
Figure 14 is the schematic diagram that shows the refrigerant cycle apparatus of a double-wall pipe of use that is used for two air-conditioning systems; With
Figure 15 is the schematic diagram that shows the refrigerant cycle apparatus of two double-wall pipes of use that are used for two air-conditioning systems.
The specific embodiment
(first embodiment)
The refrigerant cycle apparatus 100A that typically is used for automotive air-conditioning system 100 according to the double-wall pipe in the first embodiment of the present invention 160.With reference to Fig. 1 to Fig. 5 double-wall pipe 160 is described below.Fig. 1 is the schematic diagram of air-conditioning system 100; Fig. 2 is the diagrammatic sketch of double-wall pipe 160; Fig. 3 is the view profile of the part III of double-wall pipe 160 among Fig. 2; Fig. 4 is for showing the cross-sectional view strength of the straight 163a of portion; Fig. 5 is the view profile that shows bend 163b among Fig. 2; Fig. 6 is the cross-sectional view strength of bend 163b; And Fig. 7 is the perspective view that is used for forming at interior pipe 162 grooving apparatus 200 of helicla flute 162a.
Vehicle has the passenger carriage 2 that engine 10 is remained on engine room 1 wherein and separated by dividing plate (dashpanel) 3 and engine room 1.Air-conditioning system 100 has refrigerant cycle apparatus 100A and the internal element 100B that comprises expansion valve 131 and evaporimeter 141.The parts of refrigerant cycle apparatus 100A except that expansion valve 131 and evaporimeter 141 are set in the predetermined installing space of engine room 1.Internal element 100B is set in the instrument board of placing in the passenger carriage 2.
Double-wall pipe 160 combines formation by the part that will manage the high-voltage tube 151 in 150 with the part of low-voltage tube 152.High-voltage tube 151 extends between condenser 120 and expansion valve 131 transport high-pressure refrigerant before being depressurized.Low-voltage tube 152 extend between evaporimeter 141 and the compressor 110 be depressurized and cool off after transport low-temperature low-pressure refrigerant.
For example, double-wall pipe 160 has 700 to the interior length of 900mm scope.To shown in Figure 6, double-wall pipe 160 comprises the straight 163a of portion and a plurality of bend 163b with external diameter L0 as Fig. 2, and extends in engine room 1, so that double-wall pipe 160 can not contact the miscellaneous equipment and the main body of starter 10 and vehicle.
Double-wall pipe 160 has outer tube 161 and interior pipe 162.Interior pipe 162 is inserted in the outer tube 161.Outer tube 161 for example is the aluminum pipe of the 22mm diameter of internal diameter with the external diameter L0 of 22mm and 19.6mm.After connecting outer tube 161 and interior pipe 162, the end of outer tube 161 is reduced the joint portion that reduces with formation.The joint portion that reduces of outer tube 161 is welded on the interior pipe 162 with 19.1mm external diameter airtightly.In current embodiment, the external diameter of the interior pipe 162 in the part with helicla flute 162a is corresponding to the diameter of the ideal cylinder of the outer surface of the ridge 162b of pipe 162 in connecting.After forming helicla flute 162a, the maximum outside diameter of the interior pipe 162 in the part with helicla flute 162a is corresponding to the external diameter of the ideal cylinder of being determined by the outer surface of the ridge 162b of interior pipe 162.Therefore, outer tube 161 and interior pipe 162 have been determined path 160a therebetween.For example, the external diameter of outer tube 161 is 1.2 (=22/19.1) with ratio corresponding to the external diameter of the interior pipe 162 of the diameter of the ideal cylinder of the outer surface of the ridge 162b of pipe 162 in being connected.In this embodiment, in the external diameter of outer tube 161 can be set in 1.1 to 1.3 times the scope of pipe 162 external diameter.In addition, when this ratio is set in the scope between 1.1 and 1.2, can further improve the performance of double-wall pipe 160.
In pipe 162 for example be 3/4 inch aluminum pipe of internal diameter with the external diameter of 19.1mm and 16.7mm.In pipe 162 external diameter be determined so that path 160a has enough big cross-sectional area passing through high-pressure refrigerant, and the outer surface of interior pipe 162 is as much as possible near the inner surface of outer tube 161.Therefore, interior pipe 162 has the heat transfer surface area of maximum possible.
In cannelure 162c (for example 2) and helicla flute 162a (for example 3) are formed on the surface corresponding to the part of path 160a of pipe 162.Cannelure 162c is set at the position corresponding to the joint portion between the joint portion between liquid line 164 and the outer tube 161 and fluid hose 165 and the outer tube 161 respectively.Each cannelure 162c along the circumferential direction extends the circumferential groove of predetermined angular at least.Helicla flute 162a is communicated with cannelure 162c and extends between two cannelure 162c.Ridge 162b is formed on the outer wall surface of interior pipe 162.Helicla flute 162a and ridge 162b along the circumferential direction alternately are provided with the longitudinal direction along pipe and extend.The external diameter of pipe 162 in the diameter of the ideal cylinder of the outer surface of connection ridge 162b is equal to or slightly less than in fact.Annular groove 162c and helicla flute 162a have enlarged the path 160a between interior pipe 162 and the outer tube 161.
Performance according to double-wall pipe 160, the groove depth of helicla flute 162a, or rather, half of difference of diameter and the diameter of the ideal cylinder of the lower surface that is connected helicla flute 162a of ideal cylinder that connects the outer surface of ridge 162b, external diameter at interior pipe 162, or rather, in 5 to 15% scopes of the diameter of the ideal cylinder of the outer surface of connection ridge 162b.Along the length of the helicla flute 162a of the longitudinal direction of pipe be set at 300 and 800mm between scope in.The length of helicla flute 162a is corresponding to the length of the part that wherein forms helicla flute 162a of interior pipe 162.
The cannelure 162c of interior pipe 162 and helicla flute 162a can be by forming at the grooving tool shown in Fig. 7 200 as example.Grooving tool 200 has ring block 210, three balls 220 and is used for determining and regulating three bolts 230 of the position of ball 220.Medium pore 210a and three internal thread radial holes of pipe 162 in ring block 210 disposes and inserts therein.Ball 220 is set in the hole, and bolt 230 is screwed into radial hole.Bolt 230 is rotated to regulate the radial position of ball 220, so that ball 220 is from the outstanding preset distance in the inner of radial hole.Three groups (every group has ball 220 and bolt 230) forms three helicla flute 162a.In pipe 162 be inserted into medium pore 210a, the longitudinal end of the interior pipe 162 device (not shown) that is fixed keeps regularly, and bolt 230 is rotated with the surface of pipe 162 in ball 220 the is pressed onto desired depth corresponding to the degree of depth of helicla flute 162a then.
Then, keep the ring block 210 of ball 220 and bolt 230 to be rotated, so that form cannelure 162c.Subsequently, ring block 210 is rotated with the longitudinal axis along interior pipe 162 and moves, to form helicla flute 162a.The translational speed of ring block 210 is conditioned, so that helicla flute 162a forms with desired spacing or pitch.After forming helicla flute 162a, ring block 210 keeps rotation, and the lengthwise movement of ring block 210 stops, to form another cannelure 162c.
With reference to Fig. 5 and Fig. 6, among the bend 163b of the double-wall pipe 160 in first embodiment, the inner surface contact of ridge 162b contact outer tube 161, and pipe 162 in outer tube 161 extruding, thus interior pipe is remained in the outer tube 161 regularly.After the interior pipe 162 that will dispose cannelure 162c and helicla flute 162a inserted outer tube 161, the expectation of double-wall pipe 160 partly was bent to form bend 163b.In this case, the part corresponding to bend 163b of outer tube 161 is deformed, and before interior pipe 162 distortion, the circular cross sections of the same part of outer tube 161 becomes oval cross section.Therefore, outer tube 161 contacts with ridge 162b, and pipe 162 in the radial compression, so that interior pipe 162 is remained in the outer tube 161 regularly.
As shown in Figure 5, bend 163b is formed, and has the round-shaped of radius of curvature R 1 so that the inboard corresponding to the part of bend 163b of outer tube 161 is bent to.Bend 163b can comprise about 90 ° angle.As shown in Figure 6, the part corresponding to bend 163b of outer tube 161 is deformed, so that its circular cross sections is become oval cross section.The part corresponding to the middle part of bend 163b of outer tube 161 has the main shaft of the length L 2 bigger than original outer diameter L0 and the countershaft of the length L 1 shorter than length L 2.When outer tube 161 is deformed, the inner surface of the ridge 162b contact outer tube 161 of the helicla flute 162a of pipe 162 in determining.Therefore, pipe 162 was with pipe 162 in keeping regularly therein in outer tube 161 radially pushed.
In pipe 162 external diameter, or rather, connect the diameter of ideal cylinder of the outer surface of ridge 162b, in 0.7 to 0.95 or 0.8 to 0.95 times scope of the initial internal diameter of outer tube 161 so that outer tube 161 can keep regularly therein in pipe 162.
Wherein at least one bend 163b of the interior pipe 162 that is kept regularly by outer tube 161 can be formed in the length of 700mm of double-wall pipe 160, to improve the vibration resistance of double-wall pipe 160.Double-wall pipe 160 in first embodiment is provided with two bend 163b in the length of 700mm.
Double-wall pipe 160 has straight 163a of portion and bend 163b.As shown in Figure 4, in the straight 163a of portion, the diameter of the ideal cylinder of the outer surface of the ridge 162b of pipe 162 is less than the internal diameter of outer tube 161 in connecting.In the straight 163a of portion, outer surface separates with the inner surface of outer tube 162 or the part contact.Therefore, interior pipe 162 can radially slightly move or can vibrate in the straight 163a of portion.
As shown in Figure 3, the interior pipe 162 that is provided with helicla flute 162a and ridge 162b has the wavy wall with pleated shape of similar bellows.As shown in Figure 5, wavy wall is out of shape in bend 163b.The width separately in the part of the inboard of bend 163b of helicla flute 162a and ridge 162b reduces and wavy wall is retracted.The width separately in the part in the outside of bend 163b of helicla flute 162a and ridge 162b increases and wavy wall is stretched.Therefore, interior pipe 162 can be at outer tube 161 internal modifications, and can not cause too high stress in its part corresponding to bend 163b.
In the double-wall pipe 160 of first embodiment, outer tube 161 has circular cross sections, and the interior pipe 162 that disposes helicla flute 162a has bellows form.Therefore, outer tube 161 and interior pipe 162 have difformity respectively.When being bent by the double-wall pipe 160 that interior pipe 162 is inserted outer tube 161 formation, outer tube 161 and interior pipe 162 are bent simultaneously.Because outer tube 161 and interior pipe 162 have difformity respectively, so outer tube 161 is different with distortion with interior pipe 162 strains.The outer tube 161 of strain and distortion and the difference between the interior pipe 162 help the inner surface of outer tube 162 and the ridge 162b of interior pipe 162 are contacted with each other.
In the straight 163a of portion, interior pipe 162 separates with the inner surface of outer tube 161, or a side of the inner surface of contact outer tube 161.In bend 163b, interior pipe 162 contacts with respect to a plurality of parts of circumferencial direction with the inner surface of outer tube 161.Preferably, in bend 163b, interior pipe 162 contacts with a plurality of parts on the surface, inside of outer tube 161, so that interior pipe 162 can not move radially with respect to outer tube 161.For example, interior pipe 162 can with at interval part contact on diameter is relative at least two parts or three or more circumference.
So the operation and the functional effect of the double-wall pipe 160 of structure will be in conjunction with the Mollier curve descriptions shown in Fig. 8.
Passenger's desired operation air-conditioning system 100 in passenger carriage, when being used for cooling down operation, electromagnetic clutch is engaged with by engine 10 drive compression machines 110.Then, compressor 110 sucks from the cold-producing medium of evaporimeter 141 dischargings, and compressed refrigerant also is discharged into high temperature, high-pressure refrigerant in the condenser 120.Condenser 120 is cooled to high-temperature high-pressure refrigerant has the liquid fully liquid refrigerant state of essence.The liquid refrigerant of self cooling condenser 120 through being connected to double-wall pipe 160 liquid line 164 and flow into expansion valve 131 through the path 160a of double-wall pipe 160.Expansion valve 131 has reduced the pressure of liquid refrigerant, and liquid refrigerant is expanded.Evaporimeter 141 is the saturated gaseous refrigerant of essence with the degree of superheat in 0 ℃ to 3 ℃ scope with liquid refrigerant evaporates.By the cold-producing medium of evaporimeter 141 evaporation absorption of air heat, will be blown into the air of passenger carriage with cooling from the evaporimeter 141 of flowing through.By the saturated gaseous refrigerant of evaporimeter 141 evaporation, or rather, flow through suction line 165, interior pipe 162 and suction line 167 of low-temperature low-pressure refrigerant enters compressor 110.
Heat is transmitted to the low-temperature low-pressure refrigerant of the double-wall pipe 160 of flowing through from the high-temperature high-pressure refrigerant of the double-wall pipe 160 of flowing through.Therefore, in double-wall pipe 160, high-temperature high-pressure refrigerant is cooled, and low-temperature low-pressure refrigerant is heated.When liquid refrigerant is flowed through double-wall pipe 160, cold excessively from the liquid refrigerant quilt of condenser 120 dischargings, and its temperature descends.From the saturated gaseous refrigerant of evaporimeter 141 discharging by the overheated gaseous refrigerant that becomes with degree of superheat.Because the interior pipe 162 that its low pressure refrigerant flows is coated with outer tube 161, so the heat heating that low pressure refrigerant hardly can launched machine 10 radiation, and therefore can prevent the decline of the refrigeration performance of refrigerant cycle apparatus 100A.
Among the bend 163b of the double-wall pipe 160 in first embodiment, the inner surface of the ridge 162b of interior pipe 162 contact outer tube 161, and interior pipe 162 is partly pushed by outer tube 161 and keeps in position.Therefore, helicla flute 162a has guaranteed the path between outer tube 161 and the interior pipe 162, and interior pipe 162 can utilize simple structure to be remained on regularly in the outer tube 161.Because interior pipe 162 can also be remained in the outer tube 161 regularly by reliable, therefore can prevent the vibration and the resonance of outer tube 161 and interior pipe 162, prevent that outer tube 161 and interior pipe 162 from colliding mutually, will can not produce noise, and can prevent breaking of outer tube 161 and interior pipe 162.
The interior pipe 162 that disposes helicla flute 162a can be easily crooked, and the path 160a ground that very big strain can not can take place can not damage between outer tube 161 and the interior pipe 162 is crooked.Because it is crooked that very big strain ground can not can take place interior pipe 162, double-wall pipe 160 can be by lower active force bending.
When the degree of depth of helicla flute 162a the outer dia of interior pipe 162 5 and 15% between the time, heat can be transmitted to the low pressure refrigerant of interior pipe 162 inside effectively from the high-pressure refrigerant of the path 160a that flows through, and the resistance that pipe 162 low pressure refrigerant flow in can not increasing.
The ability of double-wall pipe 160 high conductance ground conduction heat makes double-wall pipe 160 can be used as inner heat exchanger, and helps to improve the efficient of refrigerant cycle apparatus 100A.Low-pressure loss in the double-wall pipe 160 has improved the refrigerating capacity of refrigerant cycle apparatus 100A.With reference to Fig. 9, in the degree of depth of helicla flute 162a is not less than 5% of pipe 162 external diameter the time, helicla flute 162a makes low pressure refrigerant flow in interior pipe 162 with eddy current, conducts to the heat of the low pressure refrigerant of the interior pipe 162 of flowing through with the high-pressure refrigerant of promotion from the path 160a that flows through.Yet the pressure loss in low-voltage tube increases along with the increase of the degree of depth of helicla flute 162a, and hinders the raising of refrigerating capacity.The pressure loss of 6kPa can reduce refrigerating capacity 1% in low-voltage tube.With respect to by not disposing the pressure loss that pipe causes in being equal to of any groove, cause the pressure loss increase 6kPa helicla flute 162a the degree of depth on be limited in pipe 162 external diameter 15%.The degree of depth of 15% of the external diameter of pipe 162 helicla flute 162a is a critical depth in equaling.When helicla flute 162a form to surpass 15% the degree of depth of external diameter of interior pipe 162, in the surface of interior pipe 162, can occur peeling off.
When the longitudinal length of helicla flute 162a 300 in the scope of 800mm, more preferably 600 in the 800mm scope time, refrigerant cycle apparatus 100A has suitable refrigerating capacity.As shown in figure 10, the pressure loss in the low pressure refrigerant that flows in interior pipe 162 increases pro rata with the length of helicla flute 162a, and the temperature difference between the high-pressure refrigerant of mobile low pressure refrigerant and the path 160a that flows through reduces and reduces along with the length of helicla flute 162a in interior pipe 162.Therefore, when the length of helicla flute 162a be added to 600 and 800mm between length the time, saturated from high-pressure refrigerant to the pyroconductivity of low pressure refrigerant.The length of helicla flute 162a is corresponding to the length of the part that wherein forms helicla flute 162a of interior pipe 162.
When the external diameter of outer tube 161 was in 1.1 to 1.3 times scope of the external diameter of interior pipe 162, outer tube 161 and interior pipe 162 can be fixed together in bend 163b reliably.Figure 11 A shows the curve that concerns between the rate of change of internal diameter L of outer tube and the angle of bend; And Figure 11 B shows the curve that concerns between ratio L (R)/L of the external diameter L (R) of helicla flute spacing and the ideal cylinder of the outer surface of the ridge that is connected interior pipe and outer tube inside diameter L.Usually, when canal curvature, tension force acts on the outside of pipe and the outside elongation of pipe.Therefore, the external diameter of pipe reduced pipe initial external diameter 10 to 30%.When the angle of bend of bend was 10 °, 30% maximum decrease appearred.In this embodiment, by bending, the internal diameter of outer tube 161 reduce pipe initial internal diameter 10 to 30%.Therefore, when angle of bend was not less than 10 °, outer tube 161 and interior pipe 162 can be fixed together reliably.
When the diameter L (R) of the ideal cylinder of the outer surface of the ridge 162b of pipe 162 was in 0.7 to 0.95 or 0.8 to 0.95 times the scope of the initial internal diameter L of outer tube 161 in connecting, outer tube 161 and interior pipe 162 can be fixed together in bend 163b reliably; And as shown in Figure 11 B when angle of bend be more than 10 ° or 10 ° the time, double-wall pipe 160 has satisfied vibration resistance.The diameter L (R) of ideal cylinder that connects the outer surface of ridge 162b reduces along with the spacing of helicla flute 162a or reducing of pitch (pitch).Therefore, the spacing of helicla flute 162a expectation is for 12mm or more than the 12mm, is equal to or greater than 0.7 times of initial internal diameter L of outer tube 161 with the diameter L (R) of the ideal cylinder of the outer surface of guaranteeing to connect ridge 162b.When outer tube 161 did not have high straightness, interior pipe 162 is difficult to insert outer tube 161, and double-wall pipe Production Line rate descends.Therefore, the expectation diameter L (R) of ideal cylinder that connects the outer surface of ridge 162b be equal to or less than outer tube 161 internal diameter 95%.
By in the length of the 700mm of double-wall pipe 160, forming at least one bend 163b, can prevent the resonance of double-wall pipe 160 and the vibration of vehicle.As shown in figure 12, the increase of the length of the bend 163b that is fixed together along with its middle external tube 161 and interior pipe 162, resonant frequency reduces.Length between the bend 163b will be known as the maintenance spacing.Suppose: the frequency of the vibration of the main body of vehicle is 50Hz.Then transport cold-producing medium and with the maintenance spacing of 3/4 inch pipe of the vibration resonance of 100Hz be 700mm.In this case, by in double-wall pipe 160, forming bend 163b with the 700mm spacing, can prevent the vibration resonance of double-wall pipe 160 and vehicle, and can prevent because outer tube 161 and interior pipe 162 collide wearing and tearing and the generation particle of producing noise, outer tube 161 and interior pipes 162 mutually.
By in liquid line 164 and 165, suitably forming bend 164a and 165a, can compatibly regulate the free-ended position separately of liquid line 164 and 165 respectively.Bend 164a and 165a are formed between the free end of the stiff end that is soldered to outer tube 162 and liquid line 164 and 165a (being branched pipe).Liquid line 164 and 165 forms superfluous length respectively, to offer the bend allowance that liquid line 164 and 165 is used for its free-ended position adjustments.When bend 164a and 165a are formed in liquid line 164 and 165 when regulating the free-ended position of liquid line 164 and 165, produce stress among bend 164a and the 165a to suppress causing stress in the brazed end.Therefore, liquid line 164 and 165 free-ended position can easily be regulated, and liquid line 164 and 165 can easily be connected respectively to condenser 120 and expansion valve 131, and promote installment work.
As the foregoing description in conjunction with Fig. 7, three balls 220 of grooving tool 200 are compressed against on the outer surface of interior pipe 162, and keep the ring block 210 of ball 220 to be rotated to form three helicla flute 162a.Lip-deep three balls 220 of pipe 162 formed the glacing flatness that three helicla flute 162a have improved interior pipe 162 in utilization was pressed against.Therefore, even the difference between the internal diameter of the external diameter of interior pipe 162 and outer tube 161 is very little, interior pipe 162 also can be inserted in the outer tube 161 smoothly.When the gap between outer tube 161 and the interior pipe 162 is narrower, be used for that fixedly the bed knife of outer tube 161 and interior pipe 162 is higher at bend 163b, and the vibration resistance of double-wall pipe 160 is higher.
When the air-tightness of the outer tube among the bend 163b 161 was very important, the minimum outer diameter of the outer tube 161 among the bend 163b was preferably 0.85 times of original outer diameter L0 of outer tube 161 or bigger.When outer tube 161 be bent to form bend 163b in case the minimum outer diameter of outer tube 161 be outer tube 161 original outer diameter 85% or when lower, the outer tube 161 among the bend 163b has elliptic jet.When outer tube 161 was bent and has elliptic jet, when high-pressure refrigerant was flowed through path 160a between outer tube 161 and the interior pipe 162, the angle of bend that its middle external tube 161 is bent trended towards reducing.Therefore, cause the masterpiece that is not less than 600 μ s of aluminum pipe fracture by fatigue to be used for the outside of crooked outer tube 161, and crackle can develop in the outside of outer tube 161.Therefore, when the minimum outer diameter of the outer tube among the bend 163b 161 be 0.85 times of original outer diameter L0 of outer tube 161 or when above, outer tube 161 has sufficient air-tightness.
(second embodiment)
Describe according to the double-wall pipe 160 among second kind of embodiment of the present invention hereinafter with reference to Figure 13 A and 13B.Double-wall pipe 160 among second embodiment comprises holding member 168.The end that holding member 168 keeps liquid line 165 and suction line 166 regularly with the preposition relation.
As shown in FIG. 13A, holding member 168 is similar, made of aluminum with liquid line 165 and suction line 166.Holding member 168 is secured to liquid line 165 and suction line 166 by soldering or riveted joint.
The liquid line 164 that is kept regularly by holding member 168 and the end of suction line 166 can not move relative to each other.Therefore, liquid line 164 and suction line 166 can easily be connected to expansion valve 131 and evaporimeter 141 respectively.
Shown in Figure 13 B, can use the holding member 168A that is formed from a resin.Holding member 168A can be placed on liquid line 165 and the suction line 166 regularly to keep liquid line 165 and suction line 166.The holding member 168A that is formed from a resin can be to form at low cost.In a second embodiment, other parts can be made similarly with above-mentioned first embodiment.
(the 3rd embodiment)
Figure 14 has shown the double-wall pipe 160 in a third embodiment in accordance with the invention.Double-wall pipe 160 among the 3rd embodiment can be used to be provided with the refrigerant cycle apparatus 100A of two air-conditioning systems of evaporimeter of the Background Region of the passenger carriage that is used for vehicle.
This refrigerant cycle apparatus 100A comprises: first loop that comprises first expansion valve 131 and first evaporimeter 141 (the first low pressure heat exchanger); With second loop that comprises second expansion valve 132 and second evaporimeter 142 (the second low pressure heat exchanger).Bypass path 153, the first loops of bypass first evaporimeter 141 and first expansion valve 131 are connected in parallel with second loop by using cold-producing medium to flow through.Bypass path 153 is connected to first loop at branch point A and binding site B place, so that form second loop.Condenser 120 comprises condensing unit 121, gas-liquid separator 122 and sub-cooling unit 123.
This double-wall pipe 160 has: the outer tube 161 that extends between the branch point A of condenser 120 and bypass path 153; And the interior pipe 162 that between the binding site B of bypass path 153 and compressor 110, extends.
In double-wall pipe 160 through the cold excessively high-pressure refrigerant of heat exchange flow through first evaporimeter 141 and second evaporimeter 142.Therefore, can obtain refrigerating function in evaporimeter 141 and 142.
As shown in figure 15, another double-wall pipe 160A can be used in combination with double-wall pipe 160.The outer tube 161 of double-wall pipe 160A extends between the branch point A of bypass path 153 and second expansion valve 132, and the interior pipe 162 of double-wall pipe 160A extends between the binding site B of bypass path 153 and second evaporimeter 142.
Heat exchange is by supercooled high-pressure refrigerant second evaporimeter 142 of flowing through in double-wall pipe 160A.Like this, can improve the refrigeration performance of second evaporimeter 142.In the 3rd embodiment, double-wall pipe 160, the structure of 160A can form similarly with above-mentioned first embodiment.
(other embodiment)
Though with reference to accompanying drawing, invention has been described in conjunction with some preferred embodiments, is noted that for those skilled in the art, numerous modifications and variations will be clearly.
For example, interior pipe 162 can be provided with the swivelling chute that is fit to quantity (for example, one or more) arbitrarily, rather than three helicla flute 162a.In addition, interior pipe 162 can be provided with vertical straight trough, rather than helicla flute.
Can use the pipe of making by such as the material beyond the aluminium of steel or copper, replace pipe 161 and 162 made of aluminum.
Though the double-wall pipe of the present invention 160 to the refrigerant cycle apparatus 100A that uses automotive air-conditioning system 100 is described, the present invention is not limited thereto in its practical application.This double-wall pipe 160 is applicable to domestic air conditioning.When double-wall pipe 160 is used for domestic air conditioning, be lower than air themperature in the engine room 1 around the temperature of the air of outer tube 161.Therefore, when the hot conduction condition between high-pressure refrigerant and the low pressure refrigerant allowed, low pressure refrigerant can be configured to through path 160a, and high-pressure refrigerant can be configured to the internal path by interior pipe 162.
The cold-producing medium of double-wall pipe 160 of flowing through is not limited among the refrigerant cycle apparatus 100A and uses cold-producing medium, and can use the different cold-producing medium of physical attribute of the cold-producing medium that uses among physical attribute and the refrigerant cycle apparatus 100A.For example, can be used in combination the cold-producing medium that flows along different directions, have a cold-producing medium of different temperatures or have the cold-producing medium of different pressures respectively respectively.In addition, the different fluid of removing the cold-producing medium of refrigerant cycle apparatus 100A can be used for double-wall pipe.
Though invention has been described with reference to its preferred embodiment, be appreciated that the present invention is not limited to preferred embodiment and structure.The present invention is intended to cover various modifications and is equal to setting.In addition, though the various parts of preferred embodiment show with multiple preferred combination and structure, comprise other combination more, still less or only single part and structure also within the spirit and scope of the present invention.
Claims (41)
1. double-wall pipe comprises:
Outer tube (161); And
Be arranged on the interior pipe (162) of outer tube inside, interior pipe has the spine (162b) that determines the slot part (162a) that extends along the longitudinal direction of interior pipe thereon, wherein:
Outer tube and interior pipe are bent with the straight portion (163a) with straight extension with from the bend (163b) of straight portion bending;
In straight portion, outer tube has the bigger internal diameter (L) of external diameter (L (R)) than the imaginary cylinder of being determined by the outer surface of the spine of interior pipe; With
At bend, the inner surface of the spine of interior pipe contact outer tube is with by outer tube radial compression and maintenance.
2. double-wall pipe according to claim 1, wherein: slot part is the spiral slot part (162a) that twines around interior pipe.
3. double-wall pipe according to claim 2, wherein: the spiral slot part comprises a plurality of helicla flutes (162a), each helicla flute has spiral-shaped and extends along the longitudinal direction.
4. double-wall pipe according to claim 3, wherein: the spiral fluted number is 3.
5. double-wall pipe according to claim 1, wherein: slot part has the groove depth in 5% to 15% scope of the external diameter of interior pipe.
6. double-wall pipe according to claim 1, wherein: slot part has 300mm to the interior longitudinal length of the scope of 800mm.
7. double-wall pipe according to claim 1, wherein: outer tube has the external diameter in 1.1 to 1.3 times the scope of external diameter of interior pipe.
8. double-wall pipe according to claim 7, wherein: outer tube has 0.85 times minimum outer diameter of the external diameter that is equal to or greater than the outer tube in the straight portion in bend.
9. double-wall pipe according to claim 1, wherein: in 0.7 to 0.95 the scope of the internal diameter of the outer tube of external diameter in straight portion of the ideal cylinder of determining by the outer surface of the spine of pipe in the straight portion.
10. double-wall pipe according to claim 1 also comprises: from the branched pipe (164,165) of the longitudinal end branch of outer tube.
11. double-wall pipe according to claim 10 also comprises: the tube connector (166,167) of the longitudinal end of pipe in being connected to.
12. double-wall pipe according to claim 11 also comprises: keep and the fixing holding member (168) of branched pipe and tube connector with predetermined location relationship.
13. double-wall pipe according to claim 12, wherein: holding member is soldered to branched pipe and tube connector.
14. double-wall pipe according to claim 12, wherein: holding member is fitted to branched pipe and tube connector.
15. double-wall pipe according to claim 10, wherein: branched pipe is configured to have the deformable segment of the terminal position that is used to regulate branched pipe.
16. double-wall pipe according to claim 15, wherein: deformable part be divided into the bend that is arranged in the branched pipe (164a, 165a).
17. double-wall pipe according to claim 1, wherein: at least one bend is set in the longitudinal length of 700mm of outer tube and interior pipe.
18. double-wall pipe according to claim 1, wherein: outer tube and interior pipe are made of aluminum.
19. according to any described double-wall pipe among the claim 1-18, wherein interior pipe has internal path therein, the low-temperature refrigerant of refrigerant cycle apparatus flows by internal path, and interior pipe is set at outer tube inside to have path (160a) betwixt, and the high temperature refrigerant of refrigerant cycle apparatus flows by path (160a).
20. according to any described double-wall pipe among the claim 1-18, wherein interior pipe has internal path therein, low temperature after being depressurized in refrigerant cycle apparatus, low pressure refrigerant flow by internal path, and interior pipe is set at outer tube inside having path (160a) therebetween, this path (160a) of flowing through of high pressure, the high temperature refrigerant in refrigerant cycle apparatus before the decompression.
21. a manufacturing comprises the method for the double-wall pipe of outer tube (161) and interior pipe (162), described method comprises the steps:
On the outer wall of interior pipe, form the slot part (162b) that extends along the longitudinal direction, so that form the spine (162b) that determines slot part (162a) thereon;
After forming slot part, interior pipe (161) is inserted in the outer tube (162) with internal diameter bigger than the external diameter of the imaginary cylinder of being determined by the outer surface of the spine of interior pipe; With
After inserting step, with in bend, pipe is to keep and to fix the mode of interior pipe therein in the surface, inside of spine's contact outer tube and the outer tube radial compression, and the part of crooked interior pipe and outer tube forms bend (163b).
22. method according to claim 21, wherein:
In the formation step of slot part,, form the helicla flute of the slot part that extends spirally along the longitudinal direction by outer wall inner radial distortion at interior pipe.
23. method according to claim 21, wherein:
In the formation step of slot part, slot part is formed to have the groove depth in 5% to 15% scope of the external diameter of interior pipe.
24. method according to claim 21, wherein:
In the formation step of slot part, slot part is formed to have the longitudinal length in 300mm arrives the 800mm scope.
25. method according to claim 21, wherein: interior pipe forms in the mode of external diameter in 1.1 to 1.3 times scope of the external diameter of interior pipe of outer tube.
26. method according to claim 25, wherein: bending step is carried out in 0.85 times the mode that the minimum outer diameter of the outer tube in bend is equal to or greater than the external diameter of the outer tube in the straight portion.
27. method according to claim 21, wherein: slot part forms step and is performed, so that the external diameter of the imaginary cylinder of being determined by the outer surface of spine is in 0.7 to 0.95 times scope of the internal diameter of outer tube.
28. method according to claim 21 also comprises:
Formation is from the branched pipe of the end branch of outer tube.
29. method according to claim 28 also comprises:
Tube connector is connected to the end of interior pipe.
30. method according to claim 29 also comprises:
Be formed for keeping regularly the holding member (168) of branched pipe and tube connector with predetermined location relationship.
31. method according to claim 30, wherein: holding member utilizes soldering or fastening branched pipe and the tube connector of being fixed to.
32. method according to claim 30, wherein: holding member is arranged on branched pipe and the tube connector regularly.
33. method according to claim 28 also comprises:
Regulate the end position of branched pipe.
34. method according to claim 33, wherein: before the end of branched pipe was conditioned, bend was formed in the branched pipe.
35. according to any described method among the claim 21-34, wherein at least one bend is formed in the longitudinal length of 700mm of outer tube and interior pipe.
36. according to any described method among the claim 21-34, its middle external tube and interior pipe are made of aluminum.
37. a refrigerating circulatory device comprises:
The compressor (110) that is used for compressed refrigerant;
Cooling is from the hp heat exchanger (120) of the cold-producing medium of compressor discharge;
The decompressing unit (131) that cold-producing medium from hp heat exchanger is reduced pressure;
The low pressure heat exchanger (141) that is evaporated from the cold-producing medium of decompressing unit wherein; With
Be linked in sequence compressor, hp heat exchanger, decompressing unit and low pressure heat exchanger to form the pipe (150) of refrigerant loop;
Wherein pipe comprises according to any described double-wall pipe (160) among the claim 1-17,
At the interior pipe of double-wall pipe and the path (160a) between the outer tube be at least in the middle of the path of pipe, be used for from hp heat exchanger to decompressing unit transport the high-pressure passage of high-pressure refrigerant or be used for from the low pressure heat exchanger transport to compressor low pressure refrigerant low-pressure passage a part and
The internal path of the interior pipe of double-wall pipe is at least a portion of high-pressure passage or low-pressure passage.
38. according to the described refrigerant cycle apparatus of claim 37, wherein: the path between outer tube and the interior pipe is at least a portion of high-pressure passage, and the internal path of interior pipe is at least a portion of low-pressure passage.
39. according to the described refrigerant cycle apparatus of claim 38, wherein: decompressing unit and low pressure heat exchanger are respectively first pressure reducer (131) and the first low pressure heat exchangers (141) that forms first loop, and refrigerant cycle apparatus also comprises:
Second loop, second loop comprise from second pressure reducer (132) of the cold-producing medium of hp heat exchanger decompression and the second low pressure heat exchanger (142) that wherein is depressurized from the cold-producing medium of second pressure reducer, wherein:
Second pressure reducer and the second low pressure heat exchanger are set in the bypass path (153), by bypass path (153) from the flow of refrigerant of hp heat exchanger and bypass first pressure reducer and the first low pressure heat exchanger;
Path between outer tube and the interior pipe is as hp heat exchanger and from the path between the branch point of the bypass path of first branch of a circuit; With
The internal path of interior pipe is as path between tie point that is attached to first bypass path that circulates and the compressor.
40. according to the described refrigerant cycle apparatus of claim 37, wherein: double-wall pipe is installed on the vehicle.
41. according to the described refrigerant cycle apparatus of claim 40, wherein: double-wall pipe is set in the engine room of vehicle.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004325521 | 2004-11-09 | ||
| JP2004325522 | 2004-11-09 | ||
| JP2004325522 | 2004-11-09 | ||
| JP2005112825 | 2005-04-08 | ||
| JP2005136390 | 2005-05-09 | ||
| JP2005263967 | 2005-09-12 |
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| CN1773206A true CN1773206A (en) | 2006-05-17 |
| CN100460794C CN100460794C (en) | 2009-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101202815A Active CN100460794C (en) | 2004-11-09 | 2005-11-09 | Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same |
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| CN (1) | CN100460794C (en) |
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| CN102121800A (en) * | 2010-01-11 | 2011-07-13 | Lg电子株式会社 | Heat exchanger |
| CN103759476A (en) * | 2013-12-24 | 2014-04-30 | 博耐尔汽车电气系统有限公司 | Automobile air controller heat exchange pipeline |
| CN105329924A (en) * | 2015-10-14 | 2016-02-17 | 贵阳铝镁设计研究院有限公司 | Low speed aluminum oxide channelization dissolution heat exchange apparatus |
| CN106216553A (en) * | 2016-08-22 | 2016-12-14 | 常州市盛士达汽车空调有限公司 | Air conditioning for automobiles heat exchange pipe preparation method |
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| US4004634A (en) * | 1975-05-06 | 1977-01-25 | Universal Oil Products Company | Automotive oil cooler |
| JP2002013882A (en) * | 2000-06-30 | 2002-01-18 | Matsushita Refrig Co Ltd | Double pipe heat exchanger and refrigerating cycle device using it |
| CN2435609Y (en) * | 2000-08-16 | 2001-06-20 | 邓全龙 | Flexible water-sucking hose for fire vehicle |
| JP2002318015A (en) * | 2001-04-17 | 2002-10-31 | Orion Mach Co Ltd | Freezer |
| JP2002318083A (en) * | 2001-04-20 | 2002-10-31 | Harman Kikaku:Kk | Double pipe heat exchanger and its manufacturing method |
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| CN102121800A (en) * | 2010-01-11 | 2011-07-13 | Lg电子株式会社 | Heat exchanger |
| CN102121800B (en) * | 2010-01-11 | 2014-03-12 | Lg电子株式会社 | Heat exchanger |
| CN106895716A (en) * | 2010-08-18 | 2017-06-27 | 韩昂系统有限公司 | Tube-in-tube heat exchanger and the method for manufacturing the tube-in-tube heat exchanger |
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| CN106216553B (en) * | 2016-08-22 | 2018-04-27 | 常州市盛士达汽车空调有限公司 | Air conditioning for automobiles heat exchange pipe preparation method |
| CN110249189A (en) * | 2017-02-07 | 2019-09-17 | 株式会社电装 | Refrigerant piping and refrigerating circulatory device |
| CN107448720A (en) * | 2017-08-09 | 2017-12-08 | 广州汽车集团乘用车有限公司 | A kind of ventilation duct and ventilation pipe manufacturing method |
| CN110207275A (en) * | 2019-07-08 | 2019-09-06 | 苏州安锐捷智能科技有限公司 | A kind of air-conditioning indoor and outdoor connection tracheae |
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