CN214197639U - Pipe fitting connection structure, heat exchanger and air conditioner - Google Patents

Abstract

The utility model relates to the technical field of pipe fitting structure, and discloses a pipe fitting connection structure, a heat exchanger and an air conditioner, wherein the pipe fitting connection structure comprises a sleeving section, a welding material belt and a sealing layer, and the sleeving section is formed by mutually sleeving two pipe ends to be connected; the welding material belt is combined at the joint between the two pipes to be connected to form fixed connection; the sealing layer is hermetically attached to the outer peripheral surface of the sleeving section and the outer peripheral surface of the welding flux belt and extends for a preset distance along the axial direction towards the two pipes to be connected. The utility model discloses, cup joint the back each other with two pipe ends that need connect, carry out welded fastening in the seam crossing of two pipes, after the welding is accomplished, adopt the seal to seal suit section and solder strip and laminate, because the pipe fitting is the tubular metal resonator, receive electrochemical corrosion easily, and the seal can effectively avoid the welding seam to appear corroding and leaking, and extend the length direction of following the pipe with the seal and predetermine the distance, improve the durability at the adjacent position of suit section, effectively prolong the life of pipe fitting under high temperature high pressure environment.

Description

Pipe fitting connection structure, heat exchanger and air conditioner

Technical Field

The utility model discloses generally, relate to a tubular product structure, particularly, relate to a tubular product connection structure, heat exchanger and air conditioner.

Background

A refrigeration apparatus in an air conditioner performs cooling or heating of air by circulation of a refrigerant (also referred to as a heat exchanger). The refrigerating device comprises a compressor, a plurality of heat exchangers and pipelines communicated between the compressor and the heat exchangers, and a valve body is usually arranged on the pipelines to adjust the flow and control the on-off of the pipelines. Since the refrigerant changes from high temperature and high pressure to low temperature and low pressure in the pipeline, the pipeline and the heat exchanger need to have good sealing performance and pressure resistance, so as to prevent leakage.

The existing lap joint structure of the pipeline piece is usually realized by welding, but the existing welding structure can cause the problem of corrosion and leakage of welding spots under the environment of long-term high temperature and high pressure, so that the connection strength of the pipe piece can not meet the working environment for a long time.

In view of the above, it is desirable to improve the structure of the conventional pipe connection structure to improve the pipe connection strength.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at overcomes above-mentioned prior art's pipe fitting joint strength can not satisfy the highly compressed operational environment's of high temperature defect for a long time, provides a pipe fitting connection structure, heat exchanger and air conditioner.

The utility model provides a pipe fitting connection structure, include:

the sleeving section is formed by sleeving two pipe ends to be connected mutually;

the welding material belt is combined at the joint between the two pipes to be connected to form fixed connection; and the number of the first and second groups,

and the sealing layer is hermetically attached to the peripheral surface of the sleeving section and the outer peripheral surface of the welding flux belt and extends to two axial sides for a preset distance.

According to an embodiment of the invention, the sleeving section comprises an inner pipe section at the end of the first pipe and an outer pipe section at the end of the second pipe, the inner diameter of the outer pipe section being larger than the outer diameter of the inner pipe section.

According to the utility model discloses an embodiment, the solder strip still extends to in the clearance between two pipes.

According to the utility model discloses an embodiment, the welding material area connect in outer pipe section terminal surface with between the inner pipe section outer peripheral face.

Further, in the above embodiment, a flaring table is disposed at an end of the outer pipe section, an inner diameter of the flaring table is larger than an inner diameter of the outer pipe section, and the solder strip is connected to an inner wall surface of the flaring table.

Further, in the above embodiment, the included angle between the flaring platform and the outer pipe section is 10-30 degrees, and the outer diameter of the flaring platform is 1.1-1.4 times of the outer diameter of the outer pipe section.

Or further, in the above embodiment, the outer tube section includes a transition section, and the cross-sectional dimension of the transition section gradually increases to be connected with the outer tube section.

Further, in the above embodiment, the inner tube section abuts against a flared side inner wall of the transition section.

Or further, in the above embodiment, the length of the outer tube section is 1.1 to 1.3 times its inner diameter.

Or further, in the above embodiment, the length of the sealing layer is 2-4 times the length of the outer tube section.

Or further, in the above embodiment, the thickness of the inner tube section is 0.3 to 0.8 times the thickness of the outer tube section.

Or further, in the above embodiment, the inner pipe section is a copper pipe, and the outer pipe section is an aluminum pipe.

According to the utility model discloses an embodiment, the closure layer includes the pyrocondensation pipe, the inner wall coating hot melt adhesive of pyrocondensation pipe.

The utility model also provides a heat exchanger, including the pipe fitting that communicates in proper order, it is adjacent the pipe fitting utilizes the pipe fitting connection structure of above-mentioned structure fixed.

The utility model also provides an air conditioner, heat exchanger including above-mentioned structure.

According to the above technical scheme, the utility model discloses an advantage and positive effect of pipe connection structure, heat exchanger and air conditioner lie in: two pipe ends that will need to connect, cup joint the back each other, carry out welded fastening at the seam crossing of two pipes, after the welding is accomplished, adopt the closing layer to close laminating suit section and solder area, because the pipe fitting generally is the tubular metal resonator, consequently receive electrochemical corrosion easily, and the closing layer can effectively avoid the welding seam to appear corroding and leaking, and extend the length direction of following the pipe with the closing layer and predetermine the distance, the durability at the adjacent position of suit section has also been improved, effectively prolong the life of pipe fitting under high temperature high pressure environment.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a perspective view of a pipe connecting structure according to an exemplary embodiment.

Fig. 2 is a front cross-sectional view of a pipe connection structure according to an exemplary embodiment.

Fig. 3 is a schematic structural view of a first tube according to an exemplary embodiment.

Fig. 4 is a schematic structural view of a first pipe according to another exemplary embodiment.

Fig. 5 is a schematic diagram of a second tube according to an exemplary embodiment.

Wherein the reference numerals are as follows:

10. a first tube; 11. an inner tube section; 12. a straight pipe section; 20. a second tube; 21. an outer tube section; 22. a transition section; 23. a flaring table; 30. welding a material belt; 40. and (4) a sealing layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In order to overcome among the prior art joint strength of pipe connection structure lower, can not use the high-pressure highly compressed operational environment's of high temperature defect, as shown in fig. 1 and fig. 2, the utility model discloses a pipe connection structure, including suit section, welding area 30 and seal 40. The sleeving section is formed by sleeving two pipe ends to be connected with each other. The solder strip 30 is bonded to the joint between the two pipes to be joined to form a fixed connection. The sealing layer 40 is hermetically attached to the sheathing section and the outer circumferential surface of the solder strip 30, and extends to both sides in the axial direction by a predetermined distance.

The utility model provides a technical scheme, two pipe ends that will need to connect, cup joint the back each other, carry out welded fastening in the seam crossing of two pipes, after the welding is accomplished, adopt seal coat 40 to seal suit section and solder strip 30 and laminate, because the pipe fitting generally is the tubular metal resonator, consequently receive electrochemical corrosion easily, and the seal coat can effectively avoid the welding seam to appear corroding and leaking, and with the length direction extension of seal coat 40 edge pipe preset distance, the durability at the adjacent position of suit section has also been improved, effectively prolong the life of pipe fitting under high temperature high pressure environment.

Specifically, when applied to pipe members, the first pipe 10 and the second pipe 20 may be fitted and fixed to each other. The solder strip 30 is filled between the first pipe 10 and the second pipe 20, and further, in order to enhance the soldering strength, the solder joint may be extended outward as appropriate. It can be understood that the first tube 10 and the second tube 20 are metal tubes, and the above-mentioned work flow of filling solder and welding can be realized by fully automatic equipment, and the flow is simple and the processing is convenient.

Referring to fig. 3-5, preferably, the encasement segment comprises an outer tube segment 21 and an inner tube segment 11, the outer tube segment 21 having a larger inner diameter than the inner tube segment 11. At least one end of the second pipe 20 is provided with an outer pipe section 21, at least one end of the first pipe 10 is provided with an inner pipe section 11, the inner pipe 11 can be a necking section, and a straight pipe section 12 can be arranged, so that the first pipe 10 can be inserted into the second pipe 20.

Referring to fig. 2, the solder ribbon 30 also extends into the gap between the two tubes. The outer pipe section 21 and the inner pipe section 11 are cylindrical pipes, an annular space with the same inner diameter is formed between the outer pipe section and the inner pipe section, and the solder strips 30 extend into the annular space, so that the welding area is enlarged, the welding strength is improved, the sealing strength is improved, and the leakage of internal fluid is reduced.

Referring to fig. 2, a solder ribbon 30 is attached between the end surface of the outer pipe section 21 and the outer circumferential surface of the inner pipe section 11. The welds of the outer pipe section 21 and the inner pipe section 11 are located at the connection point of the two, and the thickness and width of the solder strip 30 have a significant effect on the quality of the weld. Specifically, the welding band 30 may be connected to the outer end surface of the outer pipe section 21 in addition to the inner wall of the outer pipe section 21, and forms a welding space for the welding band 30 together with the outer circumferential surface of the inner pipe section 11.

Referring to fig. 2, preferably, the end of the outer tube section 21 is provided with a flare table 23, the inner diameter of the flare table 23 is larger than that of the outer tube section 21, and the solder ribbon 30 is attached to the inner wall surface of the flare table 23. The flaring of the flaring station 23 is used to facilitate filling of the solder into the annular space between the first tube 10 and the second tube 20, the filling being in a molten state, should be done to the target site as quickly as possible to avoid build-up of solder on the flaring station 23. After the filling of the solder is completed, the flaring platform 23 enables the solder strip 30 to have the maximum thickness at the flaring platform 23, gradually extend towards the outer circumferential surface of the inner pipe section 11, and the thickness becomes thinner gradually. A thick welding portion is formed between the outer pipe section 21 and the outer wall of the first pipe 10, and the width of the welding band 30 is increased to some extent, thereby improving the coupling strength of the end of the second pipe 20 and the first pipe 10.

Preferably, the angle between the flaring platform 23 and the outer tube section 21 is 10 ° to 30 °, and the outer diameter of the flaring platform 23 is 1.1 to 1.4 times the outer diameter of the outer tube section 21. The flaring angle and flaring size of the flaring platform 23 should not be too large, and the larger the flaring platform 23 is, the lower the strength between the flaring platform 23 and the outer pipe section 21 is, and the more susceptible to concentrated stress. The angle between the flaring platform 23 and the outer tube section 21 is 10-30 °, in this embodiment 16 ° is preferred, and the outer diameter of the flaring platform 23 is 1.1-1.4 times, in this embodiment 1.1 times, the outer diameter of the outer tube section 21.

Referring to fig. 2 and 5, preferably, the outer pipe section 21 includes a transition section 22, and the cross-sectional size of the transition section 22 is gradually increased to be connected with the outer pipe section 21. In order to provide the strength of the pipe, the outer pipe section 21 is transitional with the second pipe 20 by means of a transition section 22. The gradual increase in the cross-sectional dimension of the transition section 22 is beneficial to ensure the structural strength of the transition section 22 and the second tube 20. Further, the transition section 22 is a tapered surface, a convex arc surface or a concave arc surface with gradually increasing cross-sectional dimension. The conical surface is preferred in the embodiment, and can be obtained by a flaring process.

Referring to fig. 2, or further, in the above configuration, the inner tube section 11 abuts the flared side inner wall of the transition section 22. By setting the length of the inner pipe section 11, the inner pipe section 11 is abutted against the inner wall of the transition section 22, so that the inner pipe section 11 and the outer pipe section 21 form an annular welding groove with a closed inner end, and the inner pipe section 11 can be ensured to be fixed during filling of welding flux and a welding process, and the welding quality and the welding strength are ensured.

Referring to fig. 2, the length of the outer tube section 21 is preferably 1.1-1.3 times its inner diameter. In order to ensure the structural strength of the flared part, the length of the outer pipe section 21 should be reasonably set, and the length of the outer pipe section 21 is set to be too large, so that solder is wasted; if the length of the outer pipe section 21 is too small, the welding strength tends to be low, and the solder welding tends to be insufficient. The present embodiment is preferably 1.1 to 1.3 times, and has both welding strength and reasonable use of solder.

Preferably, the length of the sealing layer 40 is 2-4 times the length of the outer tube section 21. In order to ensure that the sealing layer 40 can better isolate leakage, the sleeving section is sealed and extends outwards for a reasonable preset distance, the welding position is positioned at the position of the outer pipe section 21 and the welding seam, and the length of the outer pipe section 21 and the length of the welding seam are the length of the position needing to be emphasized, so that the length of the sealing layer 40 is 2-4 times of the length of the outer pipe section 21, and the strength of the position and the surrounding position easy to be involved is ensured.

Referring to fig. 2, the thickness of the inner pipe section 11 is preferably 0.3-0.8 times the thickness of the outer pipe section 21. Since the inner diameter of the outer pipe section 21 is larger than that of the inner pipe section 11, in order to ensure that the strength of the outer pipe section 21 and the strength of the inner pipe section 11 are within a certain range, the thickness of the outer pipe section 21 is increased, so that the outer pipe section can be increased in size and also ensure certain strength. In this embodiment, the thickness of the inner tube 11 is preferably 0.3 to 0.8 times the thickness of the outer tube 21.

Preferably, the inner tube section 11 is a copper tube and the outer tube section 21 is an aluminum tube. Because the expansion coefficient of the heated aluminum pipe is larger than that of the copper pipe, the deformation of the aluminum pipe is large in the heat-cold exchange process, the copper pipe is required to be inserted into the inner side of the aluminum pipe when the copper pipe and the aluminum pipe are lapped and brazed, then the molten-state welding flux is added into a lapping gap of the copper pipe and the aluminum pipe, and the copper pipe and the aluminum pipe are connected together after cooling.

Preferably, the sealing layer 40 includes a heat shrinkable tube, and the inner wall of the heat shrinkable tube is coated with a hot melt adhesive. The first pipe 10 and the second pipe 20 are metal pipes, if two kinds of metals made of different materials are adopted, such as a copper pipe and an aluminum pipe, the potential difference between different parent metals of the copper pipe and the aluminum pipe is large, and the copper pipe and the aluminum pipe are easy to be corroded by electrochemistry. Specifically, the heat shrinkable tube can be a heat shrinkable sleeve made of polyolefin material, and can also be called an EVA material tube. The outer layer is made of high-quality soft cross-linked polyolefin material and inner layer hot melt adhesive through composite processing, the outer layer material has the characteristics of insulation, corrosion resistance, wear resistance and the like, and the inner layer has the advantages of low melting point, water resistance, sealing, high adhesion and the like. The heat-shrinkable sleeve is heated when in use and is changed back to a high elastic state to retract. In order to further improve the fitting degree and avoid the abnormal thermal shrinkage of the thermal shrinkage pipe in a high-temperature state, which leads to the failure of welding spot protection and even corrosion leakage, a thin layer of hot melt adhesive is coated on the inner side of the thermal shrinkage pipe, so that the thermal shrinkage pipe is tightly adhered to the surfaces of the first pipe 10, the second pipe 20 and the welding line through the hot melt adhesive after being overheated.

The utility model also discloses a heat exchanger, including the pipe fitting that communicates in proper order, the pipe fitting connection structure that adjacent pipe fitting utilized above-mentioned structure is fixed. At least two or more pipe fittings of the heat exchanger are communicated in sequence. The heat exchanger among this technical scheme has the same technological effect with the pipe fitting connection structure of above-mentioned structure, and this place is no longer repeated.

According to the above technical scheme, the utility model discloses a pipe connection structure's advantage lies in with positive effect: two pipe ends that will need to connect, cup joint the back each other, carry out welded fastening at the seam crossing of two pipes, after the welding is accomplished, adopt seal coat 40 to seal suit section and solder strip 30 and laminate, because the pipe fitting generally is the tubular metal resonator, consequently receive electrochemical corrosion easily, and the seal coat can effectively avoid the welding seam to appear corroding and leaking, and extend the length direction of seal coat 40 edge pipe and predetermine the distance, the durability at the adjacent position of suit section has also been improved, effectively prolong the life of pipe fitting under high temperature high pressure environment.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely exemplary of the present invention and is provided to enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (15)

1. A pipe connecting structure, comprising:

the sleeving section is formed by sleeving two pipe ends to be connected mutually;

the welding material belt (30) is combined at the joint between the two pipes to be connected to form fixed connection; and the number of the first and second groups,

and the sealing layer (40) is hermetically attached to the sleeving section and the outer peripheral surface of the welding material belt (30) and extends to two axial sides for a preset distance.

2. A pipe connection according to claim 1, c h a r a c t e r i z e d in that the encasement section comprises an inner pipe section (11) of a first pipe end and an outer pipe section (21) of a second pipe end, the inner diameter of the outer pipe section (21) being larger than the outer diameter of the inner pipe section (11).

3. A tube connection according to claim 1, characterised in that the strip of solder material (30) also extends into the gap between two tubes.

4. A pipe connecting structure according to claim 2, wherein said solder strip (30) is connected between an end surface of said outer pipe section (21) and an outer circumferential surface of said inner pipe section (11).

5. The pipe fitting connection structure according to claim 2, wherein the end of the outer pipe section (21) is provided with a flaring table (23), the inner diameter of the flaring table (23) is larger than that of the outer pipe section (21), and the welding material strip (30) is connected to the inner wall surface of the flaring table (23).

6. A tube connection according to claim 5, characterised in that the angle between the flaring platform (23) and the outer tube section (21) is between 10 ° and 30 °, the outer diameter of the flaring platform (23) being between 1.1 and 1.4 times the outer diameter of the outer tube section (21).

7. A tubular connection according to claim 2, characterized in that the outer tubular section (21) comprises a transition section (22), the cross-sectional dimension of the transition section (22) gradually increasing to connect with the outer tubular section (21).

8. A tube connection according to claim 7, characterised in that the inner tube section (11) abuts against a flared side inner wall of the transition section (22).

9. A tubular connecting structure according to claim 2, characterized in that the length of the outer tubular section (21) is 1.1-1.3 times its inner diameter.

10. A tubular connecting structure according to claim 2, characterized in that the length of the sealing layer (40) is 2-4 times the length of the outer tubular section (21).

11. A tubular connecting structure according to claim 2, characterized in that the thickness of the inner tubular section (11) is 0.3-0.8 times the thickness of the outer tubular section (21).

12. A tubular connecting structure according to claim 2, characterized in that the inner tube section (11) is a copper tube and the outer tube section (21) is an aluminum tube.

13. A tubular connecting structure according to claim 1, characterized in that said sealing layer (40) comprises a heat shrinkable tube whose inner wall is coated with a hot melt adhesive.

14. A heat exchanger comprising successively communicating pipe members, adjacent ones of which are fixed by a pipe member connecting structure according to any one of claims 1 to 13.

15. An air conditioner characterized by comprising the heat exchanger according to claim 14.

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