Pipe connection structure and heat exchanger

Abstract

This application relates to a pipe connection structure and a heat exchanger. The pipe connection structure includes a first connecting pipe, a second connecting pipe, and a connector. The connector is integrally formed, and its two ends are respectively provided with a first assembly hole and a second assembly hole that are separated from each other. The connector is fitted onto the outside of the first connecting pipe through the first assembly hole, and the inner wall of the first assembly hole is sealed and welded to the outer wall of the first connecting pipe to seal the opening of the first connecting pipe near the connector. The connector is fitted onto the outside of the second connecting pipe through the second assembly hole, and the inner wall of the second assembly hole is sealed and welded to the outer wall of the second connecting pipe to seal the opening of the second connecting pipe near the connector. The pipe connection structure provided by this application solves the problem that existing manifolds cannot simultaneously meet the requirements of easy leak detection and simple and convenient installation and fixing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe connection, in particular to a pipe connection structure and a heat exchanger. BACKGROUND

[0002] In the field of new energy automobile technology, a baffle is usually inserted at different positions in the same manifold, and the baffle is welded with the inner wall of the manifold, so that the manifold is divided into multiple independent sections which are not connected with each other, and the multiple independent sections are connected with different heat exchange circuits. However, since the baffle is arranged inside the manifold, it is impossible to detect whether there is leakage at the welding position between the baffle and the inner wall of the manifold by using conventional non-destructive testing equipment.

[0003] In order to solve the problem that the leakage point cannot be detected, a common method is to use an independent manifold for each flow channel. However, each independent manifold needs a separate fastener for fixation, which greatly increases the complexity of the installation and fixation of the manifold. SUMMARY

[0004] Therefore, it is necessary to provide a pipe connection structure and a heat exchanger to solve the problem that the existing manifold is difficult to simultaneously satisfy the conditions of easy detection of leakage points and simple and convenient installation and fixation.

[0005] The pipe connection structure provided by the present application comprises a first connecting pipe, a second connecting pipe and a connecting head. The connecting head is integrally formed, and the two ends of the connecting head are respectively provided with a first assembly hole and a second assembly hole which are separated from each other. The connecting head is sleeved on the outside of the first connecting pipe through the first assembly hole, and the inner wall of the first assembly hole and the outer wall of the first connecting pipe are sealingly welded to block the opening of the first connecting pipe close to one end of the connecting head. The connecting head is sleeved on the outside of the second connecting pipe through the second assembly hole, and the inner wall of the second assembly hole and the outer wall of the second connecting pipe are sealingly welded to block the opening of the second connecting pipe close to one end of the connecting head.

[0006] In one embodiment, the first connecting pipe is provided with a first external thread, the first assembly hole is provided with a first internal thread, the first external thread of the first connecting pipe and the first internal thread of the first assembly hole are threadedly matched, the width of the thread groove of the first external thread is greater than the width of the thread tooth of the first external thread, and the width of the thread groove of the first internal thread is greater than the width of the thread tooth of the first internal thread.

[0007] In addition, the second connecting pipe is provided with a second external thread, the second assembly hole is provided with a second internal thread, the second external thread of the second connecting pipe and the second internal thread of the second assembly hole are threadedly matched, the width of the thread groove of the second external thread is greater than the width of the thread tooth of the second external thread, and the width of the thread groove of the second internal thread is greater than the width of the thread tooth of the second internal thread.

[0008] In one of the embodiments, the connector includes a sleeve and a partition integrally formed, the sleeve is provided with a through hole, and the partition is arranged in the through hole to divide the through hole into a first assembly hole and a second assembly hole.

[0009] In one of the embodiments, the inner wall of the sleeve is in clearance fit with the outer wall of the first connecting pipe, and the inner wall of the sleeve is in clearance fit with the outer wall of the second connecting pipe.

[0010] In one of the embodiments, the inner wall of the sleeve is provided with a plurality of first positioning protrusions distributed along the circumference of the sleeve, and the heights of the first positioning protrusions protruding from the inner wall of the sleeve are equal, so that the outer wall of the first connecting pipe can abut against one end of the first positioning protrusions away from the inner wall of the sleeve, and the outer wall of the second connecting pipe can abut against one end of the first positioning protrusions away from the inner wall of the sleeve.

[0011] In one of the embodiments, the side end face of the partition close to the first connecting pipe is provided with a plurality of second positioning protrusions distributed around the axis of the sleeve, and the distances between the plurality of second positioning protrusions and the axis of the sleeve are equal.

[0012] The plurality of second positioning protrusions can stop against the outer wall of the first connecting pipe along the circumference of the first connecting pipe.

[0013] Alternatively, the plurality of second positioning protrusions can stop against the inner wall of the first connecting pipe along the circumference of the first connecting pipe.

[0014] In one of the embodiments, the side end face of the partition close to the second connecting pipe is provided with a plurality of third positioning protrusions distributed around the axis of the sleeve, and the distances between the plurality of third positioning protrusions and the axis of the sleeve are equal.

[0015] The plurality of third positioning protrusions can stop against the outer wall of the second connecting pipe along the circumference of the second connecting pipe.

[0016] Alternatively, the plurality of third positioning protrusions can stop against the inner wall of the second connecting pipe along the circumference of the second connecting pipe.

[0017] In one of the embodiments, the inner wall of the sleeve is provided with a first rotation-stopping protrusion extending along the radial direction of the sleeve, the first connecting pipe is provided with a first clamping opening corresponding to the first rotation-stopping protrusion, and the first rotation-stopping protrusion is inserted into the first clamping opening along the radial direction of the sleeve, so that the first rotation-stopping protrusion and the inner wall of the first clamping opening are fixedly clamped in fit along the circumference of the sleeve.

[0018] In addition, the inner wall of the sleeve is provided with a second rotation-stopping protrusion extending along the radial direction of the sleeve, the second connecting pipe is provided with a second clamping opening corresponding to the second rotation-stopping protrusion, and the second rotation-stopping protrusion is inserted into the second clamping opening along the radial direction of the sleeve, so that the second rotation-stopping protrusion and the inner wall of the second clamping opening are fixedly clamped in fit along the circumference of the sleeve.

[0019] In one of the embodiments, the outer wall of the first connecting pipe and the inner wall of the first assembly hole are in interference fit, and the outer wall of one end of the first connecting pipe inserted into the first assembly hole is provided with a first helical groove spirally formed along the axial direction of the first connecting pipe;

[0020] And / or, the outer wall of the second connecting pipe and the inner wall of the second assembly hole are in interference fit, and the outer wall of one end of the second connecting pipe inserted into the second assembly hole is provided with a second helical groove spirally formed along the axial direction of the second connecting pipe.

[0021] The application further provides a heat exchanger comprising the pipe connection structure according to any one of the above embodiments.

[0022] Compared with the prior art, the pipe connection structure and the heat exchanger provided by the application have the following advantages: since the first connecting pipe and the second connecting pipe are welded by the connecting head, it is not necessary to separately provide fasteners for fixing each connecting pipe, and only one of the first connecting pipe and the second connecting pipe needs to be fixed, and the installation and fixation of the entire pipe connection structure can be realized.

[0023] Further, since the connecting head is sleeved on the outer side of the first connecting pipe through the first assembly hole, and the inner wall of the first assembly hole and the outer wall of the first connecting pipe are sealingly welded to block the opening of the first connecting pipe close to the connecting head, when a leakage point is generated at the welding position of the inner wall of the first assembly hole and the outer wall of the first connecting pipe, the leaked medium can enter the outer side of the first connecting pipe from the leakage point in the first connecting pipe. Moreover, since the connecting head is integrally formed, the connecting head itself does not have a welding leakage point, that is, the medium in the first connecting pipe cannot enter the second connecting pipe through the connecting head. That is to say, the medium in the first connecting pipe can only exit the first connecting pipe through the leakage point between the inner wall of the first assembly hole and the outer wall of the first connecting pipe, and thus the detection of the leakage point of the sealingly welded position of the first connecting pipe becomes very simple, and even without the aid of professional detection equipment, the specific position of the leakage can be known by visual observation.

[0024] Similarly, since the connecting head is sleeved outside the second connecting pipe through the second assembly hole, and the inner wall of the second assembly hole and the outer wall of the second connecting pipe are sealingly welded to block the opening of the second connecting pipe close to the connecting head. Therefore, when the welding position of the inner wall of the second assembly hole and the outer wall of the second connecting pipe leaks, the leaked medium can enter the outside of the second connecting pipe from the leakage point in the second connecting pipe. And, because the connecting head is integrally formed, the connecting head itself does not have a welding leakage point, that is, the medium in the second connecting pipe cannot enter the first connecting pipe through the connecting head. That is, the medium in the second connecting pipe can only leave the second connecting pipe through the leakage point between the inner wall of the second assembly hole and the outer wall of the second connecting pipe. In this way, the detection of the leakage point of the sealingly welded position of the second connecting pipe becomes very simple, and even without the help of professional detection equipment, the specific leakage position can be known by visual observation.

[0025] In summary, the pipe connection structure provided by the present application effectively solves the problem that the existing collecting pipe is difficult to simultaneously meet the requirements of easy detection of leakage points and simple and convenient installation and fixation. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is an exploded view of a heat exchanger of an embodiment provided by the present application;

[0028] Figure 2 is Figure 1 is an enlarged view of the structure at A shown in FIG. 2;

[0029] Figure 3 is a structural schematic view of the pipe connection structure from another perspective of 2;

[0030] Figure 4 is an exploded view of a pipe connection structure of another embodiment provided by the present application Figure 1 ;

[0031] Figure 5 is an exploded view of a pipe connection structure of another embodiment provided by the present application Figure 2 ;

[0032] Figure 6 is an exploded view of a pipe connection structure of another embodiment provided by the present application;

[0033] Figure 7A cross-sectional view of a pipe connection structure according to yet another embodiment provided in the present application Figure 1 ;

[0034] Figure 8 A cross-sectional view of a pipe connection structure according to yet another embodiment provided in the present application Figure 2 ;

[0035] Figure 9 A cross-sectional view of a pipe connection structure according to yet another embodiment provided in the present application Figure 1 ;

[0036] Figure 10 A cross-sectional view of a pipe connection structure according to yet another embodiment provided in the present application Figure 2 .

[0037] Fig. 1 is a cross-sectional view of a pipe connection structure according to an embodiment provided in the present application. DETAILED DESCRIPTION

[0038] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0039] In addition, the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0040] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connecting", "fixed", and the like, should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] In the field of new energy vehicle technology, a partition plate is usually inserted at different positions in the same current collecting pipe, and the partition plate is welded with the inner wall of the current collecting pipe, so that the current collecting pipe is divided into multiple independent sections which are not communicated with each other, and the multiple independent sections are communicated with different heat exchange circuits respectively. However, since the partition plate is arranged inside the current collecting pipe, it is impossible to detect whether there is leakage at the welding position of the partition plate and the inner wall of the current collecting pipe by using conventional non-destructive testing equipment.

[0045] In order to solve the problem that the leakage point cannot be detected, a commonly used method is to use an independent manifold for each flow channel. However, each independent manifold needs a separate fastener for fixation, thereby greatly increasing the complexity of the installation and fixation of the manifold.

[0046] Please refer to Figures 1-10 In order to solve the problem that the existing manifold is difficult to simultaneously satisfy the problems of easy detection of leakage point and simple and convenient installation and fixation, the present application provides a pipe fitting connection structure 1000, which comprises a first connecting pipe 100, a second connecting pipe 200 and a connecting head 300. The connecting head 300 is integrally formed, and the two ends of the connecting head 300 are respectively provided with a first assembly hole 310 and a second assembly hole 320 which are separated from each other. The connecting head 300 is sleeved on the outside of the first connecting pipe 100 through the first assembly hole 310, and the inner wall of the first assembly hole 310 and the outer wall of the first connecting pipe 100 are sealingly welded to block the opening of the first connecting pipe 100 close to one end of the connecting head 300. The connecting head 300 is sleeved on the outside of the second connecting pipe 200 through the second assembly hole 320, and the inner wall of the second assembly hole 320 and the outer wall of the second connecting pipe 200 are sealingly welded to block the opening of the second connecting pipe 200 close to one end of the connecting head 300.

[0047] It should be noted that "sealingly welded" means that the first connecting pipe 100 and the inner wall of the first assembly hole 310 form an annular welding along the circumference, and the second connecting pipe 200 and the inner wall of the second assembly hole 320 form an annular welding along the circumference.

[0048] Since the first connecting pipe 100 and the second connecting pipe 200 are welded through the connecting head 300, it is not necessary to separately provide a fastener for fixation for each connecting pipe. Only one of the first connecting pipe 100 and the second connecting pipe 200 needs to be fixed, and the installation and fixation of the entire pipe fitting connection structure 1000 can be achieved.

[0049] Further, since the connector 300 is sleeved on the outside of the first connecting pipe 100 through the first assembly hole 310, and the inner wall of the first assembly hole 310 and the outer wall of the first connecting pipe 100 are sealingly welded to block the opening of the first connecting pipe 100 close to the connector 300. Therefore, when the welding position of the inner wall of the first assembly hole 310 and the outer wall of the first connecting pipe 100 leaks, the leaked medium can enter the outside of the first connecting pipe 100 from the leakage point in the first connecting pipe 100. And, because the connector 300 is integrally formed, the connector 300 itself does not have a welding leakage point, that is, the medium in the first connecting pipe 100 cannot enter the second connecting pipe 200 through the connector 300. That is, the medium in the first connecting pipe 100 can only leave the first connecting pipe 100 through the leakage point between the inner wall of the first assembly hole 310 and the outer wall of the first connecting pipe 100, so that the detection of the leakage point of the sealingly welded position of the first connecting pipe 100 becomes very simple, and even without the help of professional detection equipment, the specific leakage position can be known by visual observation.

[0050] Similarly, since the connector 300 is sleeved on the outside of the second connecting pipe 200 through the second assembly hole 320, and the inner wall of the second assembly hole 320 and the outer wall of the second connecting pipe 200 are sealingly welded to block the opening of the second connecting pipe 200 close to the connector 300. Therefore, when the welding position of the inner wall of the second assembly hole 320 and the outer wall of the second connecting pipe 200 leaks, the leaked medium can enter the outside of the second connecting pipe 200 from the leakage point in the second connecting pipe 200. And, because the connector 300 is integrally formed, the connector 300 itself does not have a welding leakage point, that is, the medium in the second connecting pipe 200 cannot enter the first connecting pipe 100 through the connector 300. That is, the medium in the second connecting pipe 200 can only leave the second connecting pipe 200 through the leakage point between the inner wall of the second assembly hole 320 and the outer wall of the second connecting pipe 200, so that the detection of the leakage point of the sealingly welded position of the second connecting pipe 200 becomes very simple, and even without the help of professional detection equipment, the specific leakage position can be known by visual observation.

[0051] In summary, the pipe connecting structure 1000 provided by the present application effectively solves the problem that the existing collecting pipe is difficult to simultaneously meet the requirements of easy detection of leakage points and simple and convenient installation and fixation.

[0052] And, the inner wall of the first assembly hole 310 and the outer wall of the first connecting pipe 100 are seal welded, which is conducive to improving the welding area of the first connecting pipe 100 and the connector 300, and further improving the connecting strength of the first connecting pipe 100 and the connector 300. Similarly, the inner wall of the second assembly hole 320 and the outer wall of the second connecting pipe 200 are seal welded, which is conducive to improving the welding area of the second connecting pipe 200 and the connector 300, and further improving the connecting strength of the second connecting pipe 200 and the connector 300.

[0053] Specifically, in an embodiment, the connector 300 is a metal piece, and the connector 300 is processed and formed by a turning process, so as to be conducive to improving the structural strength of the connector 300. But not limited to this, in other embodiments, the connector 300 can also be processed and formed by a casting process, so as to be conducive to reducing the processing difficulty of the connector 300.

[0054] In an embodiment, as shown in Figures 2-6 The connector 300 includes a sleeve 330 and a partition plate 340 which are integrally formed, the sleeve 330 is provided with a through hole 331, and the partition plate 340 is arranged in the through hole 331, so as to divide the through hole 331 into the first assembly hole 310 and the second assembly hole 320.

[0055] In this way, the solder can penetrate into the first assembly hole 310 and the second assembly hole 320 from the opening of the through hole 331 away from the partition plate 340, which greatly reduces the welding difficulty of the pipe connecting structure 1000.

[0056] Further, in an embodiment, as shown in Figures 7-10 The inner wall of the sleeve 330 is in clearance fit with the outer wall of the first connecting pipe 100, and the inner wall of the sleeve 330 is in clearance fit with the outer wall of the second connecting pipe 200.

[0057] In this way, the solder can penetrate into the sleeve 330 and the first connecting pipe 100 through the clearance between the sleeve 330 and the first connecting pipe 100, and similarly, the solder can penetrate into the sleeve 330 and the second connecting pipe 200 through the clearance between the sleeve 330 and the second connecting pipe 200.

[0058] But not limited to this, in other embodiments, the sleeve 330 and the first connecting pipe 100 can also be in transition fit or interference fit.

[0059] Further, in an embodiment, as shown in Figures 7-8As shown, the inner wall of the sleeve 330 is provided with a plurality of first positioning protrusions 332 distributed along the circumference of the sleeve 330, and the heights of the first positioning protrusions 332 protruding from the inner wall of the sleeve 330 are equal, so that the outer wall of the first connecting pipe 100 can abut against one end of the first positioning protrusions 332 away from the inner wall of the sleeve 330, and the outer wall of the second connecting pipe 200 can abut against one end of the first positioning protrusions 332 away from the inner wall of the sleeve 330.

[0060] In this way, the assembly concentricity of the first connecting pipe 100 and the sleeve 330 is greatly improved, that is, the gap between the sleeve 330 and the first connecting pipe 100 can be uniformly arranged, which is beneficial to improve the welding uniformity of the first connecting pipe 100 and the sleeve 330. Similarly, the gap between the sleeve 330 and the second connecting pipe 200 can be uniformly arranged, which is beneficial to improve the welding uniformity of the second connecting pipe 200 and the sleeve 330.

[0061] In an embodiment, the plurality of first positioning protrusions 332 are arranged at intervals along the circumference of the sleeve 330.

[0062] In this way, the inflow of the solder can be avoided by the first positioning protrusions 332.

[0063] Further, in another embodiment, the partition plate 340 is provided with a plurality of second positioning protrusions 341 around the axis of the sleeve 330 on the side end face close to the first connecting pipe 100, the distance between the plurality of second positioning protrusions 341 and the axis of the sleeve 330 is equal, and the plurality of second positioning protrusions 341 can stop against the outer wall of the first connecting pipe 100 along the circumference of the first connecting pipe 100.

[0064] But not limited to this, in other embodiments, as Figure 9 As shown, the plurality of second positioning protrusions 341 can stop against the inner wall of the first connecting pipe 100 along the circumference of the first connecting pipe 100.

[0065] The above technical solutions all ensure the coaxiality of the first connecting pipe 100 and the sleeve 330.

[0066] Similarly, further, in another embodiment, the partition plate 340 is provided with a plurality of third positioning protrusions 342 around the axis of the sleeve 330 on the side end face close to the second connecting pipe 200, the distance between the plurality of third positioning protrusions 342 and the axis of the sleeve 330 is equal, and the plurality of third positioning protrusions 342 can stop against the outer wall of the second connecting pipe 200 along the circumference of the second connecting pipe 200.

[0067] But not limited to this, in other embodiments, as Figure 10 As shown, the plurality of third positioning protrusions 342 can stop against the inner wall of the second connecting pipe 200 along the circumference of the second connecting pipe 200.

[0068] The above technical solutions all ensure the coaxiality of the second connecting pipe 200 and the sleeve 330.

[0069] In one embodiment, the end of the first connecting pipe 100 near the partition 340 is spaced apart from the partition 340.

[0070] This provides sufficient space for the end of the first connecting pipe 100 to expand and contract with temperature changes, preventing the first connecting pipe 100 and the sleeve 330 from detaching from the weld.

[0071] Similarly, in one embodiment, the end of the second connecting pipe 200 near the partition 340 is spaced apart from the partition 340.

[0072] This provides sufficient space for the end of the second connecting pipe 200 to expand and contract with temperature changes, preventing the second connecting pipe 200 and the sleeve 330 from detaching from the weld.

[0073] In one embodiment, such as Figure 2 As shown, the inner wall of the sleeve 330 is provided with a first anti-rotation protrusion 333 extending radially therein, and the first connecting pipe 100 is provided with a first bayonet 120 corresponding to the first anti-rotation protrusion 333. The first anti-rotation protrusion 333 is inserted into the first bayonet 120 along the radial direction of the sleeve 330 so that the first anti-rotation protrusion 333 and the inner wall of the first bayonet 120 are fixedly engaged along the circumference of the sleeve 330.

[0074] This prevents the first connecting pipe 100 from rotating relative to the sleeve 330, which helps to improve the welding strength between the first connecting pipe 100 and the sleeve 330.

[0075] Similarly, in one embodiment, such as Figure 3 As shown, the inner wall of the sleeve 330 is provided with a second anti-rotation protrusion 334 extending radially therein, and the second connecting pipe 200 is provided with a second bayonet 220 corresponding to the second anti-rotation protrusion 334. The second anti-rotation protrusion 334 is inserted into the second bayonet 220 radially along the sleeve 330 so that the second anti-rotation protrusion 334 and the inner wall of the second bayonet 220 are fixedly engaged along the circumference of the sleeve 330.

[0076] This prevents the second connecting pipe 200 from rotating relative to the sleeve 330, which helps to improve the welding strength between the second connecting pipe 200 and the sleeve 330.

[0077] However, this is not the only embodiment; in other embodiments, such as Figure 6As shown, the sleeve 330 can also be configured as a triangular prism, a quadrangular prism or other polygonal prism. Correspondingly, the first connecting pipe 100 can also be configured as a triangular prism, a quadrangular prism or other polygonal prism, and the second connecting pipe 200 can also be configured as a triangular prism, a quadrangular prism or other polygonal prism.

[0078] In one embodiment, the outer wall of the first connecting pipe 100 and the inner wall of the first mounting hole 310 are interference-fitted, and the outer wall of the end of the first connecting pipe 100 inserted into the first mounting hole 310 is provided with a first spiral groove (not shown) that spirals along the axial direction of the first connecting pipe 100.

[0079] This facilitates the solder to enter between the first connecting pipe 100 and the first assembly hole 310 along the first spiral groove.

[0080] Similarly, in one embodiment, the outer wall of the second connecting pipe 200 and the inner wall of the second assembly hole 320 are interference-fitted, and the outer wall of the end of the second connecting pipe 200 inserted into the second assembly hole 320 is provided with a second spiral groove (not shown) that spirals along the axial direction of the second connecting pipe 200.

[0081] This facilitates the solder to enter the space between the second connecting pipe 200 and the second assembly hole 320 along the second spiral groove.

[0082] In one embodiment, such as Figure 4 As shown, the first connecting pipe 100 is provided with a first external thread 110, and the first mounting hole 310 is provided with a first internal thread 311. The first external thread 110 of the first connecting pipe 100 and the first internal thread 311 of the first mounting hole 310 are threadedly engaged. The width of the thread groove of the first external thread 110 is greater than the width of the thread tooth of the first external thread 110, and the width of the thread groove of the first internal thread 311 is greater than the width of the thread tooth of the first internal thread 311.

[0083] Since the first external thread 110 and the first internal thread 311 are threaded together, the width of the thread groove of the first external thread 110 is equal to the width of the thread groove of the first internal thread 311, and the width of the thread tooth of the first external thread 110 is equal to the width of the thread tooth of the first internal thread 311. Furthermore, because the width of the thread groove of the first internal thread 311 is greater than the width of the thread tooth of the first internal thread 311, the width of the thread groove of the first internal thread 311 is also greater than the width of the thread tooth of the first external thread 110. Therefore, when the first external thread 110 is screwed into the thread groove between the first internal thread 311, the thread tooth of the first external thread 110 and the thread groove of the first internal thread 311 have a clearance fit. This facilitates the flow of solder along the gap between the thread tooth of the first external thread 110 and the thread groove of the first internal thread 311 into the space between the first connecting pipe 100 and the first mounting hole 310. Similarly, because the width of the thread groove of the first external thread 110 is greater than the width of the thread tooth of the first external thread 110, the width of the thread groove of the first external thread 110 is also greater than the width of the thread tooth of the first internal thread 311. Therefore, when the first internal thread 311 is screwed into the thread groove between the first external thread 110, the thread tooth of the first internal thread 311 and the thread groove of the first external thread 110 are in clearance fit. This facilitates the flow of solder along the gap between the thread tooth of the first internal thread 311 and the thread groove of the first external thread 110 into the space between the first connecting pipe 100 and the first assembly hole 310.

[0084] Similarly, in one embodiment, such as Figure 5 As shown, the second connecting pipe 200 is provided with a second external thread 210, and the second mounting hole 320 is provided with a second internal thread 321. The second external thread 210 of the second connecting pipe 200 and the second internal thread 321 of the second mounting hole 320 are threadedly engaged. The width of the thread groove of the second external thread 210 is greater than the width of the thread tooth of the second external thread 210, and the width of the thread groove of the second internal thread 321 is greater than the width of the thread tooth of the second internal thread 321.

[0085] Since the second external thread 210 and the second internal thread 321 are threadedly engaged, the thread groove width of the second external thread 210 is equal to the thread groove width of the second internal thread 321, and the thread tooth width of the second external thread 210 is equal to the thread tooth width of the second internal thread 321. Since the thread groove width of the second internal thread 321 is greater than the thread tooth width of the second internal thread 321, the thread groove width of the second internal thread 321 is also greater than the thread tooth width of the second external thread 210. Therefore, when the second external thread 210 is screwed into the thread groove between the second internal threads 321, the thread tooth of the second external thread 210 and the thread groove of the second internal thread 321 are in clearance fit, so that the solder can flow into the gap between the second connecting pipe 200 and the second assembly hole 320 along the gap between the thread tooth of the second external thread 210 and the thread groove of the second internal thread 321. Similarly, since the thread groove width of the second external thread 210 is greater than the thread tooth width of the second external thread 210, the thread groove width of the second external thread 210 is also greater than the thread tooth width of the second internal thread 321. Therefore, when the second internal thread 321 is screwed into the thread groove between the second external threads 210, the thread tooth of the second internal thread 321 and the thread groove of the second external thread 210 are in clearance fit, so that the solder can flow into the gap between the second connecting pipe 200 and the second assembly hole 320 along the gap between the thread tooth of the second internal thread 321 and the thread groove of the second external thread 210.

[0086] The application also provides a heat exchanger comprising the pipe joint structure 1000 of any one of the above embodiments.

[0087] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present application as long as the combination does not result in contradictions.

[0088] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A pipe fitting connection structure, characterized in that, The utility model provides a connecting pipe, which comprises a first connecting pipe (100), a second connecting pipe (200) and a connecting head (300), the connecting head (300) is integrally formed, and the two ends of the connecting head (300) are respectively provided with a first assembly hole (310) and a second assembly hole (320) which are separated from each other, the connecting head (300) is sleeved on the outside of the first connecting pipe (100) through the first assembly hole (310), and the inner wall of the first assembly hole (310) and the outer wall of the first connecting pipe (100) are sealingly welded to block the opening of the first connecting pipe (100) close to one end of the connecting head (300), the connecting head (300) is sleeved on the outside of the second connecting pipe (200) through the second assembly hole (320), and the inner wall of the second assembly hole (320) and the outer wall of the second connecting pipe (200) are sealingly welded to block the opening of the second connecting pipe (200) close to one end of the connecting head (300). The first connecting pipe (100) is provided with a first external thread (110), the first assembly hole (310) is provided with a first internal thread (311), the first external thread (110) of the first connecting pipe (100) and the first internal thread (311) of the first assembly hole (310) are threadedly matched, the width of the thread groove of the first external thread (110) is greater than the width of the thread tooth of the first external thread (110), and the width of the thread groove of the first internal thread (311) is greater than the width of the thread tooth of the first internal thread (311). And / or, the second connecting pipe (200) is provided with a second external thread (210), the second assembly hole (320) is provided with a second internal thread (321), the second external thread (210) of the second connecting pipe (200) and the second internal thread (321) of the second assembly hole (320) are threadedly matched, the width of the thread groove of the second external thread (210) is greater than the width of the thread tooth of the second external thread (210), and the width of the thread groove of the second internal thread (321) is greater than the width of the thread tooth of the second internal thread (321). The connecting head (300) comprises a sleeve (330) and a partition plate (340) which are integrally formed, the sleeve (330) is provided with a through hole (331), and the partition plate (340) is arranged in the through hole (331) so that the through hole (331) is divided into the first assembly hole (310) and the second assembly hole (320).

2. The pipe coupling according to claim 1, wherein The inner wall of the sleeve (330) is in clearance fit with the outer wall of the first connecting pipe (100), and the inner wall of the sleeve (330) is in clearance fit with the outer wall of the second connecting pipe (200).

3. The pipe connection structure according to claim 2, characterized by The inner wall of the sleeve (330) is provided with a plurality of first positioning protrusions (332) distributed circumferentially along the sleeve (330), and the heights of the first positioning protrusions (332) protruding from the inner wall of the sleeve (330) are equal, so that the outer wall of the first connecting pipe (100) can abut against one end of the first positioning protrusion (332) away from the inner wall of the sleeve (330), and the outer wall of the second connecting pipe (200) can abut against one end of the first positioning protrusion (332) away from the inner wall of the sleeve (330).

4. The pipe coupling according to claim 2, wherein The baffle (340) is provided with a plurality of second positioning protrusions (341) distributed around the axis of the sleeve (330) near one side end face of the first connecting pipe (100), and the distances of the plurality of second positioning protrusions (341) from the axis of the sleeve (330) are equal. The plurality of second positioning protrusions (341) can stop along the circumference of the first connecting pipe (100) on the outer wall of the first connecting pipe (100). Alternatively, the plurality of second positioning protrusions (341) can stop along the circumference of the first connecting pipe (100) on the inner wall of the first connecting pipe (100).

5. The pipe coupling according to claim 2, wherein The baffle (340) is provided with a plurality of third positioning protrusions (342) distributed around the axis of the sleeve (330) near one side end face of the second connecting pipe (200), and the distances of the plurality of third positioning protrusions (342) from the axis of the sleeve (330) are equal. The plurality of third positioning protrusions (342) can stop along the circumference of the second connecting pipe (200) on the outer wall of the second connecting pipe (200). Alternatively, the plurality of third positioning protrusions (342) can stop along the circumference of the second connecting pipe (200) on the inner wall of the second connecting pipe (200).

6. The pipe coupling according to Claim 1, wherein The inner wall of the sleeve (330) is provided with a first rotation-stopping protrusion (333) extending radially along itself, the first connecting pipe (100) is provided with a first clamping opening (120) corresponding to the first rotation-stopping protrusion (333), the first rotation-stopping protrusion (333) is inserted into the first clamping opening (120) along the radial direction of the sleeve (330), so that the first rotation-stopping protrusion (333) and the inner wall of the first clamping opening (120) are fixedly connected and matched along the circumference of the sleeve (330). And / or, the inner wall of the sleeve (330) is provided with a second rotation-stopping protrusion (334) extending radially along itself, the second connecting pipe (200) is provided with a second clamping opening (220) corresponding to the second rotation-stopping protrusion (334), the second rotation-stopping protrusion (334) is inserted into the second clamping opening (220) along the radial direction of the sleeve (330), so that the second rotation-stopping protrusion (334) and the inner wall of the second clamping opening (220) are fixedly connected and matched along the circumference of the sleeve (330).

7. The pipe coupling according to Claim 1, wherein The outer wall of the first connecting pipe (100) and the inner wall of the first assembly hole (310) are in interference fit, and the outer wall of one end of the first connecting pipe (100) inserted into the first assembly hole (310) is provided with a first spiral groove spiraled along the axial direction of the first connecting pipe (100); And / or, the outer wall of the second connecting pipe (200) and the inner wall of the second assembly hole (320) are in interference fit, and the outer wall of one end of the second connecting pipe (200) inserted into the second assembly hole (320) is provided with a second spiral groove spiraled along the axial direction of the second connecting pipe (200).

8. A heat exchanger, characterized by The pipe fitting connecting structure (1000) comprises the pipe fitting connecting structure (1000) according to any one of claims 1-7.

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