Cylinder connecting structure and shell and tube heat exchanger

Abstract

The utility model provides a barrel connecting structure and a shell and tube heat exchanger. The barrel connecting structure comprises a first barrel body and a second barrel body, an annular friction groove is formed in an end opening of the first barrel. The port of the second cylinder body is inserted into the annular friction groove along the axial direction and is in clearance fit with the annular friction groove; and the port of the second cylinder body is connected with the groove bottom of the annular friction groove in a friction welding manner. According to the arrangement, the second barrel body is in clearance fit with the annular friction groove, the annular friction groove can limit the range of molten mass through the groove position in the friction welding process, a welding seam is neater and more attractive, the sealing performance of welding connection of the annular barrel-shaped object can be improved, and the yield of welding connection is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a tube connection structure and a shell and tube heat exchanger. Background Art

[0002] The heat exchangers between the fluorine circuit and the water circuit of traditional constant temperature devices such as swimming pool heat pumps, seawater aquaculture equipment, and hot and cold water heat exchange are mostly shell and tube heat exchangers, and most of them use ordinary PVC plastic shells, and the outer cylinder and the upper and lower covers are fixed by gluing. This method requires a long time to let the glue dry, which not only has low production efficiency, but also requires the use of special air drying racks, low plant space utilization, and is mostly manual operation, with high labor costs. In addition, the heat exchanger shell fixed by gluing will also crack due to thermal expansion and contraction during use, or aging over time, etc., which is not only not durable, but also has poor sealing and is prone to leakage. At the same time, the use of glue is not environmentally friendly. Utility Model Content

[0003] Based on the above, a tube connection structure and a shell and tube heat exchanger are provided, which optimize the production process of the shell and tube heat exchanger, enable better automated production, improve production efficiency, and also improve the durability of the shell of the shell and tube heat exchanger.

[0004] A cylinder connection structure includes a first cylinder and a second cylinder; the port of the first cylinder is provided with an annular friction groove; the port of the second cylinder is inserted into the annular friction groove along the axial direction and is loosely matched with the annular friction groove; the port of the second cylinder is connected to the bottom of the annular friction groove by friction welding. In this way, through the loose match between the second cylinder and the annular friction groove, the annular friction groove can limit the range of the molten mass through the groove position during the friction welding process, which not only makes the welding seam more neat and beautiful, but also improves the sealing of the welding connection of the annular cylindrical object and increases the yield rate of the welding connection.

[0005] In one of the embodiments, a circular annular friction plate is provided at the port of the second cylinder; the thickness of the circular annular friction plate is smaller than the wall thickness of the second cylinder, so that the connection seam between the first cylinder and the second cylinder is smoother; the circular annular friction plate is axially inserted into the circular annular friction groove and has a clearance fit with the circular annular friction groove; the axial depth L1 of the circular annular friction groove is smaller than the axial depth L2 of the circular annular friction plate.

[0006] In one embodiment, the difference between the axial depth L1 of the annular friction groove and the axial depth L2 of the annular friction plate is between 1 mm and 1.5 mm.

[0007] In one embodiment, the port of the second cylinder is provided with an axially protruding arc surface. With such a configuration, the port of the second cylinder can be provided with an axially protruding arc surface to rub against the bottom of the annular friction groove in the initial stage of friction welding. The friction area is small and slowly extends to both sides from the friction contact position, which can not only play a preheating role, but also make the friction welding surface more uniform and the connection strength high. In addition, for welding of large-circle-width surfaces such as the port of a round tube, the sealing of the welding surface will be better. At the same time, the amount of molten mass extruded during the welding process is small, and the friction welding process is more energy-efficient.

[0008] In one of the embodiments, a flange is provided at the port of the first cylinder to increase the end surface area of ​​the first cylinder and facilitate the opening of a circular friction groove with a larger width.

[0009] In one embodiment, it further includes a sealing ring; the sealing ring is arranged at the bottom of the annular friction groove; the melting point of the sealing ring is lower than the melting points of the first cylinder and the second cylinder; the density of the sealing ring is lower than the density of the first cylinder and the second cylinder. In this embodiment, the sealing ring can first rub against the sealing ring through the port of the first cylinder and the port of the second cylinder in the initial stage of friction welding, which plays a role of friction positioning and preheating. After the sealing ring is melted, the second cylinder and the bottom of the annular friction groove are rubbed for physical welding. Since the density of the sealing ring is lower than the density of the first cylinder and the second cylinder, the density of the first molten substance is usually lower than the density of the second molten substance generated by the friction between the first cylinder and the second cylinder. Therefore, the first molten substance of the sealing ring will be lifted and squeezed from the gap between the second cylinder and the annular friction groove to the uppermost layer. After solidification again, it can protect the friction welding seam and improve the sealing and reliability. The sealing ring can also reduce the machining accuracy of the annular friction groove and / or the port surface of the second cylinder, saving machining costs.

[0010] In one embodiment, the volume of the sealing ring is between 1% and 5% of the volume of the annular friction groove. This arrangement can reduce the overflow of the first molten material of the sealing ring during the friction welding process, making the weld more neat and beautiful, while saving materials and processing and manufacturing costs.

[0011] The above-mentioned cylinder connection structure is provided, through the clearance cooperation between the second cylinder and the annular friction groove, the annular friction groove can limit the range of the molten mass through the groove position during the friction welding process, which not only makes the welding seam more neat and beautiful, but also can improve the sealing of the welding connection of the annular cylindrical object and increase the yield rate of the welding connection.

[0012] According to the above content, the present application also provides a shell and tube heat exchanger.

[0013] A shell and tube heat exchanger includes an upper cover body, an outer cylinder body, and a lower cover body which are sequentially connected to form a heat exchange chamber, and a heat exchange tube arranged in the heat exchange chamber, wherein the upper cover body and the outer cylinder body, and / or the lower cover body and the outer cylinder body are connected by using any of the tube connection structures described above. The production process of the shell and tube heat exchanger is optimized, and automated production can be better performed, which improves production efficiency and the durability of the shell of the shell and tube heat exchanger. It does not need to occupy a special air drying rack, has high space utilization rate in the factory, and has low labor costs. At the same time, no glue is needed, which is more environmentally friendly.

[0014] In one of the embodiments, it also includes an inner cylinder; one end of the inner cylinder is sealed and connected to the upper cover, and the other end is sealed and connected to the lower cover; the upper cover, the lower cover, the outer cylinder and the inner cylinder form the heat exchange chamber; the upper cover is provided with a first water circuit connecting pipe, and the lower cover is provided with a second water circuit connecting pipe, the first water circuit connecting pipe and the second water circuit connecting pipe are connected to the heat exchange chamber, and together form a first medium heat exchange channel; the heat exchange tube is a spiral heat exchange tube wound on the inner cylinder; it also includes a first fluorine circuit connecting pipe connected to the inlet end of the spiral heat exchange tube, and a second fluorine circuit connecting pipe connected to the outlet end of the spiral heat exchange tube; the first fluorine circuit connecting pipe and the second fluorine circuit connecting pipe pass through the cavity wall of the heat exchange chamber to communicate with the outside, and are sealed and connected to the cavity wall of the heat exchange chamber; the first fluorine circuit connecting pipe, the spiral heat exchange tube and the second fluorine circuit connecting pipe form a second medium heat exchange channel, and the first medium and the second medium exchange heat in the heat exchange chamber through heat conduction of the spiral heat exchange tube.

[0015] In one of the embodiments, it further includes a spiral partition; the spiral partition is arranged between the outer cylinder and the inner cylinder, dividing the heat exchange cavity between the outer cylinder and the inner cylinder into a spiral heat exchange cavity, and the spiral heat exchange flat tube is arranged in the spiral heat exchange cavity.

[0016] In one embodiment, the upper cover body, the outer cylinder body and the lower cover body are made of PVC material.

[0017] The shell and tube heat exchanger provided above optimizes the production process of the shell and tube heat exchanger, can better carry out automated production, improve production efficiency, and also improve the durability of the shell of the shell and tube heat exchanger. And it does not need to occupy a special air drying rack, the plant space utilization rate is high, and the labor cost is low. At the same time, no glue is needed, which is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a connecting cylinder in a cylinder connection structure provided for one or more embodiments;

[0019] Figure 2 A schematic diagram of a cross-sectional structure of a tube connection structure provided for one or more embodiments;

[0020] Figure 3 A schematic diagram of a cross-sectional structure of a tube connection structure provided for one or more embodiments;

[0021] Figure 4 A schematic diagram of a cross-sectional structure of a tube connection structure provided for one or more embodiments;

[0022] Figure 5 A schematic diagram of a cross-sectional structure of a tube connection structure provided for one or more embodiments;

[0023] Figure 6 A schematic diagram of a partial cross-sectional structure of a shell and tube heat exchanger provided for one or more embodiments;

[0024] Figure 7 A schematic diagram of the assembly structure of the main components of a shell and tube heat exchanger provided for one or more embodiments.

[0025] Explanation of the reference numerals: 10. first cylinder; 11. annular friction groove; 20. second cylinder; 21. annular friction plate; 30. sealing ring; 31. first molten medium; 40. second molten medium; 100. upper cover; 110. first water circuit connecting pipe; 120. first fluorine circuit connecting pipe; 130. second fluorine circuit connecting pipe; 200. lower cover; 210. second water circuit connecting pipe; 310. outer cylinder; 320. inner cylinder; 400. spiral heat exchange tube. DETAILED DESCRIPTION

[0026] In this patent document, the following discussion Figure 1-7 The various embodiments used to describe the principles or methods of the present disclosure are for illustration only and should not be interpreted as limiting the scope of the present disclosure in any way. With reference to the accompanying drawings, preferred embodiments of the present disclosure will be described below. In the following description, detailed descriptions of well-known functions or configurations will be omitted so as not to confuse the subject matter of the present disclosure with unnecessary details. Moreover, the terms used herein will be defined according to the functions of the utility model. Therefore, the terms may vary depending on the intention or usage of the user or operator. Therefore, the terms used herein must be understood based on the descriptions made herein.

[0027] A tube connection structure, such as Figure 1As shown, it includes a first cylinder 10 and a second cylinder 20. The port of the first cylinder 10 is provided with an annular friction groove 11. The port of the second cylinder 20 is inserted into the annular friction groove 11 along the axial direction and is loosely matched with the annular friction groove 11. The port of the second cylinder 20 is connected to the bottom of the annular friction groove 11 by friction welding. In this way, through the loose match between the second cylinder 20 and the annular friction groove 11, the annular friction groove 11 can limit the range of the molten mass through the groove position during the friction welding process, which not only makes the welding seam more neat and beautiful, but also improves the sealing of the welding connection of the annular cylindrical object and increases the yield rate of the welding connection.

[0028] In one embodiment, if Figure 1 Figure 2 As shown, the port of the second cylinder 20 is provided with an annular friction plate 21. The thickness of the annular friction plate 21 is less than the wall thickness of the second cylinder 20, so that the connection seam between the first cylinder 10 and the second cylinder 20 is smoother. The annular friction plate 21 is inserted into the annular friction groove 11 along the axial direction and has a clearance fit with the annular friction groove 11. Figure 2 Figure 3 As shown, the axial depth L1 of the annular friction groove 11 is smaller than the axial depth L2 of the annular friction plate 21 .

[0029] In one embodiment, the difference between the axial depth L1 of the annular friction groove 11 and the axial depth L2 of the annular friction plate 21 is between 1 mm and 1.5 mm.

[0030] In one embodiment, if Figure 3 As shown, the port of the second cylinder 20 is provided with an axially protruding arc surface. In this way, in the initial stage of friction welding, the port of the second cylinder 20 can be provided with an axially protruding arc surface to rub against the bottom of the annular friction groove 11, and the friction area is small, and it slowly extends from the friction contact position to both sides, which can not only play a preheating role, but also make the friction welding surface more uniform and the connection strength high. In addition, for the welding of large-circle-width round tube ports, the sealing of the welding surface will be better. At the same time, the amount of molten mass extruded during the welding process is small, and the friction welding process is more energy-efficient.

[0031] In one embodiment, if Figure 1-Figure 5 As shown, the end of the first cylinder 10 is provided with a flange to increase the end surface area of ​​the first cylinder 10 and facilitate the opening of a circular friction groove 11 with a larger width.

[0032] In one embodiment, if Figure 4As shown, it also includes a sealing ring 30. The sealing ring 30 is arranged at the bottom of the annular friction groove 11. The melting point of the sealing ring 30 is lower than the melting points of the first cylinder 10 and the second cylinder 20. The density of the sealing ring 30 is lower than the density of the first cylinder 10 and the second cylinder 20. In this embodiment, the sealing ring 30 can be rubbed with the sealing ring 30 through the port of the first cylinder 10 and the port of the second cylinder 20 in the initial stage of friction welding, which plays a role of friction positioning and preheating. After the sealing ring 30 is melted, the second cylinder 20 is rubbed with the bottom of the annular friction groove 11 for physical welding. Since the density of the sealing ring 30 is lower than the density of the first cylinder 10 and the second cylinder 20, as shown in FIG. Figure 5 As shown, the density of the first molten mass 31 after melting is usually lower than the density of the second molten mass 40 generated by the friction between the first cylinder 10 and the second cylinder 20. Therefore, the first molten mass 31 of the sealing ring 30 will be lifted and squeezed from the gap between the second cylinder 20 and the annular friction groove 11 to the uppermost layer. After solidification, it can protect the friction welding seam and improve the sealing and reliability. The sealing ring 30 can also reduce the machining accuracy of the annular friction groove 11 and / or the end surface of the second cylinder 20, saving machining costs.

[0033] In one embodiment, the volume of the sealing ring 30 is between 1% and 5% of the volume of the annular friction groove 11. This arrangement can reduce the overflow of the first molten mass 31 of the sealing ring 30 during the friction welding process, making the weld more neat and beautiful, while saving materials and manufacturing costs.

[0034] The above-mentioned cylinder connection structure is provided, through the clearance fit between the second cylinder 20 and the annular friction groove 11, the annular friction groove 11 can limit the range of the molten mass through the groove position during the friction welding process, which not only makes the welding seam more neat and beautiful, but also can improve the sealing of the welding connection of the annular cylindrical object and increase the yield rate of the welding connection.

[0035] According to the above content, the present application also provides a shell and tube heat exchanger.

[0036] A shell and tube heat exchanger, such as Figure 6 As shown, it includes an upper cover body 100, an outer cylinder body 310, a lower cover body 200, and a heat exchange tube arranged in the heat exchange chamber, which are connected in sequence to form a heat exchange chamber. The upper cover body 100 and the outer cylinder body 310, and / or the lower cover body 200 and the outer cylinder body 310 are connected by any of the above-mentioned tube connection structures. The production process of the shell and tube heat exchanger is optimized, and automated production can be better carried out, which improves production efficiency and the durability of the shell of the shell and tube heat exchanger. And there is no need to occupy a special air-drying rack, the space utilization rate of the factory is high, and the labor cost is low. At the same time, no glue is needed, which is more environmentally friendly.

[0037] In one embodiment, if Figure 6 Figure 7 As shown, it also includes an inner cylinder 320. One end of the inner cylinder 320 is sealed and connected to the upper cover 100, and the other end is sealed and connected to the lower cover 200. A heat exchange chamber is formed between the upper cover 100, the lower cover 200, the outer cylinder 310 and the inner cylinder 320. The upper cover 100 is provided with a first water circuit connecting pipe 110, and the lower cover 200 is provided with a second water circuit connecting pipe 210. The first water circuit connecting pipe 110 and the second water circuit connecting pipe 210 are connected to the heat exchange chamber, and together constitute a first medium heat exchange channel. The heat exchange tube is a spiral heat exchange tube 400 wound on the inner cylinder 320. It also includes a first fluorine circuit connecting pipe 120 connected to the inlet end of the spiral heat exchange tube 400, and a second fluorine circuit connecting pipe 130 connected to the outlet end of the spiral heat exchange tube 400. The first fluorine circuit connecting pipe 120 and the second fluorine circuit connecting pipe 130 pass through the cavity wall of the heat exchange chamber to communicate with the outside world, and are sealed and connected to the cavity wall of the heat exchange chamber. The first fluorine-path connecting tube 120 , the spiral heat exchange tube 400 and the second fluorine-path connecting tube 130 constitute a second medium heat exchange channel, and the first medium and the second medium exchange heat in the heat exchange cavity through heat conduction of the spiral heat exchange tube 400 .

[0038] In one embodiment, a spiral partition is further included. The spiral partition is arranged between the outer cylinder 310 and the inner cylinder 320 to divide the heat exchange cavity between the outer cylinder 310 and the inner cylinder 320 into a spiral heat exchange cavity, and the spiral heat exchange flat tube is arranged in the spiral heat exchange cavity.

[0039] In one embodiment, the upper cover body 100, the outer cylinder body 310, and the lower cover body 200 are made of PVC material.

[0040] The shell and tube heat exchanger provided above optimizes the production process of the shell and tube heat exchanger, can better carry out automated production, improve production efficiency, and also improve the durability of the shell of the shell and tube heat exchanger. And it does not need to occupy a special air drying rack, the plant space utilization rate is high, and the labor cost is low. At the same time, no glue is needed, which is more environmentally friendly.

[0041] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A tube connection structure, characterized in that: It includes a first cylinder and a second cylinder; The end of the first cylinder is provided with an annular friction groove; The port of the second cylinder is inserted into the annular friction groove along the axial direction and has a clearance fit with the annular friction groove; The port of the second cylinder is connected to the bottom of the annular friction groove by friction welding.

2. The sleeve connection structure according to claim 1, characterized in that: The port of the second cylinder is provided with an annular friction plate; The thickness of the annular friction plate is smaller than the wall thickness of the second cylinder, so that the connection seam between the first cylinder and the second cylinder is smoother; The annular friction plate is inserted into the annular friction groove along the axial direction and is in clearance fit with the annular friction groove; The axial depth L1 of the annular friction groove is smaller than the axial depth L2 of the annular friction plate.

3. The sleeve connection structure according to claim 2, characterized in that: The difference between the axial depth L1 of the annular friction groove and the axial depth L2 of the annular friction plate is between 1 mm and 1.5 mm.

4. The sleeve connection structure according to claim 1, characterized in that: The port of the second cylinder is provided with an axially protruding arc surface.

5. The sleeve connection structure according to claim 1, characterized in that: The port of the first cylinder is provided with a flange to increase the end surface area of ​​the first cylinder and facilitate the opening of a circular friction groove with a larger width.

6. The sleeve connection structure according to any one of claims 1 to 5, characterized in that: Also included is a fusion seal ring; The sealing ring is arranged at the bottom of the annular friction groove; The melting point of the sealing ring is lower than the melting points of the first cylinder and the second cylinder; The density of the sealing ring is lower than the density of the first cylinder and the second cylinder.

7. The sleeve connection structure according to claim 6, characterized in that: The volume of the sealing ring is between 1% and 5% of the volume of the annular friction groove.

8. A shell and tube heat exchanger, comprising an upper cover body, an outer cylinder body, a lower cover body connected in sequence to form a heat exchange chamber, and a heat exchange tube arranged in the heat exchange chamber, characterized in that: The upper cover body and the outer cylinder body, and / or the lower cover body and the outer cylinder body are connected by using the cylinder connection structure described in any one of claims 1 to 7.

9. The shell and tube heat exchanger according to claim 8, characterized in that: Also includes an inner cylinder; One end of the inner cylinder is sealed and connected to the upper cover, and the other end is sealed and connected to the lower cover; The heat exchange chamber is formed between the upper cover body, the lower cover body, the outer cylinder body and the inner cylinder body; The upper cover body is provided with a first water channel connecting pipe, and the lower cover body is provided with a second water channel connecting pipe, the first water channel connecting pipe and the second water channel connecting pipe are connected to the heat exchange cavity, and together constitute a first medium heat exchange channel; The heat exchange tube is a spiral heat exchange tube wound on the inner cylinder; It also includes a first fluorine-circuit connecting pipe connected to the inlet end of the spiral heat exchange tube, and a second fluorine-circuit connecting pipe connected to the outlet end of the spiral heat exchange tube; The first fluorine-circuit connecting pipe and the second fluorine-circuit connecting pipe pass through the cavity wall of the heat exchange cavity to communicate with the outside, and are sealed and connected to the cavity wall of the heat exchange cavity; The first fluorine-path connecting tube, the spiral heat exchange tube and the second fluorine-path connecting tube constitute a second medium heat exchange channel, and the first medium and the second medium exchange heat in the heat exchange cavity through heat conduction of the spiral heat exchange tube.

10. The shell and tube heat exchanger according to claim 9, characterized in that: Also included are spiral baffles; The spiral partition is arranged between the outer cylinder and the inner cylinder, dividing the heat exchange cavity between the outer cylinder and the inner cylinder into a spiral heat exchange cavity, and the spiral heat exchange tube is arranged in the spiral heat exchange cavity.

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