An expansion joint and an expansion device comprising the same

Abstract

The utility model provides a kind of expansion pipe joint and the expansion pipe device comprising it, it is related to air conditioning technical field, solve the technical problem that expansion joint exists larger gap, easy to loosen, not firm. The expansion pipe joint includes installation seat, expansion rod and expansion head that are sequentially arranged;The installation seat is used to be connected with the drive source of expansion pipe device;The expansion head is polygonal prism structure;The number of side edge of expansion head is 4-12;Expansion head front end has flared portion. The utility model expansion head of polygonal prism structure, edge will make the part of expansion pipe and expansion joint contact form multiple angles, this multiple angle will be embedded in the edge of component matched with expansion pipe, so that expansion pipe and matched assembly form occlusion, at the same time, drive entire expansion pipe to all perform everted, expand so that it forms close combination with matched component.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a polygonal ribbed tube expansion joint for plate heat exchangers and a tube expansion device including the same. Background Technology

[0002] Traditional tube expansion devices use cylindrical joints. While these joints can ensure uniform expansion of every part of the workpiece during the expansion process, the actual expansion quality suffers from insufficient expansion amplitude and inadequate interlocking between components, resulting in poor expansion quality and large gaps or looseness between components. Utility Model Content

[0003] The purpose of this utility model is to provide a polygonal tube expansion joint for plate heat exchangers and a tube expansion device including the same, so as to solve the technical problems of large gaps, easy loosening and instability in the existing expansion joint.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This utility model provides an expansion joint, comprising a mounting base, an expansion rod, and an expansion head arranged sequentially; wherein:

[0006] The mounting base is used to connect to the drive source of the tube expansion device;

[0007] The expansion head has a polygonal prism structure.

[0008] The expansion joint provided by this utility model increases multiple stress points during expansion by setting the expansion head as a polygonal prism structure. Under the same expansion pressure, the pressure is increased and the expansion force is enhanced by reducing the contact area between the expansion head and the expanded component. By optimizing the expansion head structure of the expansion device and increasing the flaring area, the interlocking degree between the components after expansion is improved, thus improving the expansion quality, the strength of the expansion, and the sealing degree between the connecting pipe and the upper end plate. It can also enhance the filling effect of the brazing filler metal during the brazing process and improve the welding quality of the plate heat exchanger.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] As a further improvement of this utility model, the number of side ridges of the expansion head is 4-12.

[0011] The purpose of the ridges is to expand the bottom area of ​​the joint during the expansion process. Different numbers of ridges result in different expanded flare areas. The number of ridges can be selected based on the required expansion performance. During expansion, the multi-ridged expansion device is aligned with the top of the pipe to be expanded via a positioning shaft. As the expansion device contacts the pipe, the multiple ridges on the expansion head apply an outward expansion tension to the contact area. As the depth of the expansion head inside the pipe increases, the shape of the contact area between the pipe and the expansion head deforms outward. The ridges create multiple angles at the contact point between the pipe and the expansion joint. These angles embed into the edges of the components that mate with the pipe, creating an interlocking action between the expanded pipe and the mating components. Simultaneously, the entire pipe flares outward, expanding and creating a tight bond between it and the mating components.

[0012] As a further improvement of this utility model, the expansion head is a hexagonal prism structure, or the expansion head is an octagonal prism structure.

[0013] The hexagonal or octagonal prism structure expansion head of this utility model can enhance the interlocking degree of the expansion assembly by increasing the flaring area. The multi-faceted expansion head forms multiple edges on the contacting parts during expansion, thereby enhancing the interlocking degree between the parts and making it more difficult for expansion quality problems such as loosening or shaking to occur.

[0014] As a further improvement of this utility model, the front end of the expansion head has a flared portion.

[0015] As a further improvement of this utility model, when the expansion head is a hexagonal prism structure, the flared part is a hexagonal pyramid structure.

[0016] As a further improvement of this utility model, when the expansion head is an octagonal prism structure, the flared part is an octagonal frustum structure.

[0017] This invention increases the expansion area of ​​the expanded parts by setting a tapered and multi-faceted flared part. By controlling the expansion depth, the range of the flared part can be controlled, thereby enhancing the fit between components in a manner similar to flanging.

[0018] As a further improvement of this utility model, the adjacent side edges of the flared portion have an arc-shaped surface structure.

[0019] As a further improvement of this utility model, the surface of the expansion head is a heat-treated surface.

[0020] The surface hardness of the expansion head is improved by heat treatment, specifically medium-temperature quenching and high-temperature tempering.

[0021] As a further improvement of this utility model, the surfaces of the expansion head and the expansion rod are chrome-plated.

[0022] The surface is chrome-plated to improve the hardness, wear resistance, and corrosion resistance of the expansion head, and to extend its service life.

[0023] As a further improvement of this utility model, the thickness of the chromium plating layer is 7-10 micrometers.

[0024] This utility model provides a tube expansion device, including the tube expansion joint.

[0025] The tube expansion device of this utility model improves the tube expansion joint by transforming the cylindrical expansion head into a multi-sided structure with multiple edges. Compared with the traditional cylindrical expansion head, the expansion head of this structure has the following three advantages in the expansion process:

[0026] 1. The multi-faceted structure increases the number of stress points during expansion jointing. Under the same expansion jointing pressure, by reducing the contact area between the expansion component and the component being expanded, the pressure is increased and the expansion jointing force is enhanced.

[0027] 2. Enhances the interlocking of expansion joint components. The multi-faceted expansion head forms multiple edges on the contacting parts during expansion, thereby enhancing the interlocking between the parts and making it less likely for expansion quality problems such as loosening or shaking to occur.

[0028] 3. Increase the flaring area. The tapered and multi-faceted expansion head structure increases the expansion area of ​​the parts to be expanded. By controlling the expansion depth, the range of the flaring can be controlled, thereby enhancing the fit between components in a manner similar to flanging. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a three-dimensional structural schematic diagram of one embodiment of the expansion joint of this utility model;

[0031] Figure 2 This is a three-dimensional structural schematic diagram of another embodiment of the expansion joint of this utility model;

[0032] Figure 3 This is a front view of one embodiment of the expansion joint of this utility model;

[0033] Figure 4 This is an end face view of one embodiment of the expansion joint of this utility model;

[0034] Figure 5This is a front view of another embodiment of the expansion joint of this utility model;

[0035] Figure 6 This is an end view of another embodiment of the expansion joint of this utility model.

[0036] In the diagram: 1. Mounting base; 2. Expansion rod; 3. Expansion head; 4. Flared end. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] like Figures 1-6 As shown, this utility model provides an expansion joint, including a mounting base 1, an expansion rod 2, and an expansion head 3 arranged sequentially; wherein:

[0039] Mounting base 1 is used to connect to the drive source of the tube expander; for example, a hydraulic press, on which mounting base 1 is mounted;

[0040] The expansion rod 2 is a cylindrical structure; one end is connected to the mounting base 1, and the other end is connected to the expansion head 3.

[0041] In this embodiment, the expansion head 3 is a polygonal prism structure, that is, a prism structure with multiple side edges, and the specific number of side edges can be selected and set according to the actual situation.

[0042] The expansion joint provided by this utility model increases the number of stress points during expansion by setting the expansion head 3 into a polygonal prism structure. Under the same expansion pressure, the pressure is increased and the expansion force is enhanced by reducing the contact area between the expansion head 3 and the expanded component. By optimizing the structure of the expansion head 3 of the expansion device, the flaring area is enlarged, the interlocking degree between the components after expansion is improved, the expansion quality is improved, the expansion firmness is higher, and the sealing degree between the pipe and the upper end plate is better. It can also enhance the filling effect of the brazing filler metal during the brazing process and improve the welding quality of the plate heat exchanger.

[0043] As a further improvement of this utility model, the number of side edges of the expansion head 3 is 4-12.

[0044] The function of the ridges is to expand the bottom area of ​​the joint during the expansion process. Different numbers of ridges result in different expanded flare areas. The number of ridges can be selected according to the requirements of the expansion performance. During expansion, the multi-ridged tube expansion device is aligned with the top of the tube to be expanded via the positioning shaft. As the expansion device contacts the tube, the multiple ridges on the expansion head 3 apply an outward expansion tension to the contact position of the tube. As the depth of the expansion head 3 inside the tube continues to increase, the shape of the contact area between the tube and the expansion head 3 will also deform outward. The ridges will cause the contact area between the tube and the expansion joint to form multiple angles. These angles will embed into the edges of the components that mate with the tube, forming an interlocking action between the expanded tube and the mating components. At the same time, it will cause the entire tube to flare outward, expanding it to form a tight fit with the mating components.

[0045] To facilitate flaring, the front end of the expansion head 3 has a flared section 4.

[0046] To improve hardness and lifespan, the surface of the expansion head 3 is heat-treated. For example, the surface of the expansion head 3 is subjected to medium-temperature quenching and high-temperature tempering. Furthermore, the surfaces of the expansion rod 2 and the mounting base 1 are also heat-treated.

[0047] The surface hardness of the expansion head 3 is improved by heat treatment, specifically by medium-temperature quenching and high-temperature tempering.

[0048] As a further improvement of this utility model, the surfaces of the expansion head 3 and the expansion rod 2 are chrome-plated.

[0049] The surface is chrome-plated to improve the hardness, wear resistance, and corrosion resistance of the expansion head 3, and to extend its service life.

[0050] As a further improvement of this utility model, the thickness of the chromium plating layer is 7-10 micrometers.

[0051] By setting a 7-10 micrometer chromium plating layer, and making the plating layer as thin as possible while ensuring properties such as hardness and wear resistance, costs can be reduced.

[0052] Example 1:

[0053] like Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, the expansion joint includes a mounting base 1, an expansion rod 2, and an expansion head 3 arranged sequentially; wherein:

[0054] The expansion head 3 has a hexagonal prism structure;

[0055] The hexagonal prism expansion head 3 of this utility model can increase the flaring area and enhance the interlocking degree of the expansion assembly. The multi-faceted expansion head 3 forms multiple edges on the contacting parts during expansion, thereby enhancing the interlocking degree between the parts and making it more difficult for expansion quality problems such as loosening or shaking to occur.

[0056] When the expansion head 3 is a hexagonal prism structure, the flared part 4 is a hexagonal pyramid structure.

[0057] like Figure 4 As shown, the flared part 4 has six side edges, and the adjacent side edges are planar structures.

[0058] This invention increases the expansion area of ​​the expanded parts by setting a tapered and multi-faceted flared part 4. By controlling the expansion depth, the range of the flared part can be controlled, thereby enhancing the fit between components in a manner similar to flanging.

[0059] Example 2:

[0060] like Figure 2 , Figure 5 and Figure 6 As shown, in this embodiment, the expansion joint includes a mounting base 1, an expansion rod 2, and an expansion head 3 arranged sequentially; wherein:

[0061] The expansion head 3 has an octagonal prism structure.

[0062] The octagonal prism structure expansion head 3 of this utility model can increase the flaring area and enhance the interlocking degree of the expansion assembly. The multi-faceted expansion head 3 forms multiple edges on the contacting parts during expansion, thereby enhancing the interlocking degree between the parts and making it more difficult for expansion quality problems such as loosening or shaking to occur.

[0063] Furthermore, when the expansion head 3 is an octagonal prism structure, the flared part 4 is an octagonal frustum structure.

[0064] The flared part 4 has eight side edges, and the adjacent side edges of the flared part 4 have an arc-shaped surface structure.

[0065] Specifically, the arc-shaped surface is concave inward, forming a groove-like structure, and all corners and connections are arc-shaped transition structures.

[0066] This invention increases the expansion area of ​​the expanded parts by setting a tapered and multi-faceted flared part 4. By controlling the expansion depth, the range of the flared part can be controlled, thereby enhancing the fit between components in a manner similar to flanging.

[0067] Example 3:

[0068] like Figures 1-6 As shown in this embodiment, the tube expansion device provided by the present invention includes the tube expansion joint in the above embodiment.

[0069] The expansion joint includes a mounting base 1, an expansion rod 2, and an expansion head 3 arranged sequentially; wherein:

[0070] Mounting base 1 is used to connect to the drive source of the tube expander; for example, a hydraulic press, on which mounting base 1 is mounted;

[0071] The expansion rod 2 is a cylindrical structure; one end is connected to the mounting base 1, and the other end is connected to the expansion head 3.

[0072] In this embodiment, the expansion head 3 is a polygonal prism structure, that is, a prism structure with multiple side edges, and the specific number of side edges can be selected and set according to the actual situation.

[0073] The expansion joint provided by this utility model increases the number of stress points during expansion by setting the expansion head 3 into a polygonal prism structure. Under the same expansion pressure, the pressure is increased and the expansion force is enhanced by reducing the contact area between the expansion head 3 and the expanded component. By optimizing the structure of the expansion head 3 of the expansion device, the flaring area is enlarged, the interlocking degree between the components after expansion is improved, the expansion quality is improved, the expansion firmness is higher, and the sealing degree between the pipe and the upper end plate is better. It can also enhance the filling effect of the brazing filler metal during the brazing process and improve the welding quality of the plate heat exchanger.

[0074] As a further improvement of this utility model, the number of side edges of the expansion head 3 is 4-12.

[0075] The function of the ridges is to expand the bottom area of ​​the joint during the expansion process. Different numbers of ridges result in different expanded flare areas. The number of ridges can be selected according to the requirements of the expansion performance. During expansion, the multi-ridged tube expansion device is aligned with the top of the tube to be expanded via the positioning shaft. As the expansion device contacts the tube, the multiple ridges on the expansion head 3 apply an outward expansion tension to the contact position of the tube. As the depth of the expansion head 3 inside the tube continues to increase, the shape of the contact area between the tube and the expansion head 3 will also deform outward. The ridges will cause the contact area between the tube and the expansion joint to form multiple angles. These angles will embed into the edges of the components that mate with the tube, forming an interlocking action between the expanded tube and the mating components. At the same time, it will cause the entire tube to flare outward, expanding it to form a tight fit with the mating components.

[0076] As an optional embodiment of this utility model, the expansion head 3 is a hexagonal prism structure;

[0077] When the expansion head 3 is a hexagonal prism structure, the flared part 4 is a hexagonal pyramid structure.

[0078] like Figure 4 As shown, the flared part 4 has six side edges, and the adjacent side edges are planar structures.

[0079] As another optional embodiment of this utility model, the expansion head 3 has an octagonal prism structure.

[0080] Furthermore, when the expansion head 3 is an octagonal prism structure, the flared part 4 is an octagonal frustum structure.

[0081] The flared part 4 has eight side edges, and the adjacent side edges of the flared part 4 have an arc-shaped surface structure.

[0082] Specifically, the arc-shaped surface is concave inward, forming a groove-like structure, and all corners and connections are arc-shaped transition structures.

[0083] To facilitate flaring, the front end of the expansion head 3 has a flared section 4.

[0084] To improve hardness and lifespan, the surface of the expansion head 3 is heat-treated. For example, the surface of the expansion head 3 is subjected to medium-temperature quenching and high-temperature tempering. Furthermore, the surfaces of the expansion rod 2 and the mounting base 1 are also heat-treated.

[0085] The surface hardness of the expansion head 3 is improved by heat treatment, specifically by medium-temperature quenching and high-temperature tempering.

[0086] As a further improvement of this utility model, the surfaces of the expansion head 3 and the expansion rod 2 are chrome-plated.

[0087] The surface is chrome-plated to improve the hardness, wear resistance, and corrosion resistance of the expansion head 3, and to extend its service life.

[0088] As a further improvement of this utility model, the thickness of the chromium plating layer is 7-10 micrometers.

[0089] By setting a 7-10 micrometer chromium plating layer, and making the plating layer as thin as possible while ensuring properties such as hardness and wear resistance, costs can be reduced.

[0090] During use, the mounting base 1 connects the entire expansion joint to the hydraulic press. The expansion head 3 is the main device for expansion, adjusting the degree of expansion by controlling the pressing depth, thereby adjusting the fit of the joint. During the expansion process, care must be taken not to press too deeply; otherwise, the component may deform due to excessive expansion depth, leading to component failure and necessitating its scrapping.

[0091] The tube expansion device of this utility model improves the tube expansion joint by transforming the cylindrical expansion head 3 into a multi-sided structure with multiple edges. Compared with the traditional cylindrical expansion head 3, the expansion head 3 of this structure has the following three advantages in the expansion process:

[0092] 1. The multi-faceted structure increases the number of stress points during expansion jointing. Under the same expansion jointing pressure, by reducing the contact area between the expansion component and the component being expanded, the pressure is increased and the expansion jointing force is enhanced.

[0093] 2. Enhance the interlocking degree of the expansion joint components. The multi-faceted expansion head 3 forms multiple edges on the contacting parts during expansion, thereby enhancing the interlocking degree between the parts and making it more difficult for expansion joint quality problems such as loosening or shaking to occur.

[0094] 3. Increase the flaring area. The tapered and multi-faceted expansion head structure increases the flaring area of ​​the parts to be expanded. By controlling the expansion depth, the flaring range can be controlled, thereby enhancing the fit between components in a manner similar to flanging.

[0095] Currently, this expansion joint has been applied to the expansion connection between the upper plate and the connecting pipe of our company's plate heat exchanger (economizer), with very obvious results and is suitable for widespread use.

[0096] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0097] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0098] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0099] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0100] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0101] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0102] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An expansion joint, characterized in that, It includes a mounting base, an expansion rod, and an expansion head arranged in sequence; wherein: The mounting base is used to connect to the drive source of the tube expansion device; The expansion head has a polygonal prism structure.

2. The expansion joint according to claim 1, characterized in that, The number of side edges of the expansion head is 4-12.

3. The expansion joint according to claim 1, characterized in that, The expansion head is a hexagonal prism structure, or the expansion head is an octagonal prism structure.

4. The expansion joint according to claim 2 or 3, characterized in that, The front end of the expansion head has a flared section.

5. The expansion joint according to claim 4, characterized in that, When the expansion head is a hexagonal prism structure, the flared part is a hexagonal pyramid structure.

6. The expansion joint according to claim 4, characterized in that, When the expansion head is an octagonal prism structure, the flared part is an octagonal frustum structure.

7. The expansion joint according to claim 6, characterized in that, The adjacent side edges of the flared portion have an arc-shaped surface structure.

8. The expansion joint according to claim 1, characterized in that, The surface of the expansion head is a heat-treated surface.

9. The expansion joint according to claim 1, characterized in that, The surfaces of the expansion head and the expansion rod are chrome-plated.

10. A tube expansion device, characterized in that, Includes the expansion joint as described in any one of claims 1-9.

Images