Integrated axial flow pump blade double-pipe heat exchanger

Abstract

The integrated axial flow pump blade double-pipe heat exchanger comprises a heat exchanger inner pipe and a motor, the open end of the heat exchanger inner pipe is rotationally and hermetically connected with a liquid inlet cavity, and the liquid inlet cavity is fixedly connected with a first fluid input pipe; the heat exchanger inner pipe comprises a medium outflow section and a heat exchange section; a liquid outlet cavity is rotationally and hermetically connected to the exterior of the medium outflow section, a plurality of liquid outlet holes communicating with the heat exchanger shell are formed in the medium outflow section, and a first fluid output pipe is arranged on the heat exchanger shell; a heat exchanger shell is connected outside the heat exchange section in a rotating and sealing mode, a plurality of sets of outer axial flow type blades are arranged outside the heat exchange section, and a second fluid input pipe and a second fluid output pipe are arranged on the heat exchanger shell. Circulation of two kinds of fluid can be achieved through a single motor, meanwhile, the inner axial flow blade and the outer axial flow blade are additionally arranged, the heat exchange area can be increased, radial force can be applied to the fluid, a fluid laminar flow boundary layer near the wall face is damaged, disturbance is increased, and the heat exchange capacity between cold fluid and hot fluid is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular to an integrated axial flow pump blade-tube heat exchanger. Background Art

[0002] Most existing shell-and-tube heat exchangers use water pumps to drive the cold and hot fluids in the shell and tube sides for heat exchange. Existing dual-water pump systems require two separate pump sets, significantly increasing the cost of the device. Furthermore, when dual pumps are in operation, the increased pump power consumption significantly increases energy loss. Dual-pump systems require an additional 20%-30% of piping and control system space, increasing the footprint and making installation inconvenient. Existing shell-and-tube heat exchangers use water pumps to transport fluids. However, due to flow resistance losses and the annular flow channel that restricts the development of secondary fluid flow, the turbulence intensity of the fluid is insufficient. Furthermore, the walls of existing shell-and-tube heat exchangers are prone to fouling, increasing the thermal resistance and worsening heat transfer. This results in low heat transfer efficiency and energy utilization in existing shell-and-tube heat exchangers. Therefore, to address these issues, an integrated axial-flow blade-and-tube heat exchanger device is proposed that achieves dual-fluid drive through a single motor and offers improved heat exchange efficiency. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides an integrated axial-flow blade-in-tube heat exchanger device that realizes dual-fluid drive through a single motor and has better heat exchange efficiency.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0005] Provided is an integrated axial flow pump blade sleeve heat exchanger, comprising a heat exchanger inner tube with one end closed, the closed end of the heat exchanger inner tube connected to the output end of the motor, the open end of the heat exchanger inner tube rotary sealedly connected to a liquid inlet cavity, the liquid inlet cavity fixedly connected to a first fluid input pipe; the heat exchanger inner tube comprises a medium outflow section with a closed end and a heat exchange section located in the middle; the outside of the medium outflow section is rotary sealedly connected to the liquid outlet cavity, the medium outflow section is provided with a plurality of liquid outlet holes communicating with the liquid outlet cavity, and the liquid outlet cavity is provided with a first fluid output pipe; the outside of the heat exchange section is rotary sealedly connected to a heat exchanger outer shell, a plurality of groups of outer axial flow blades are provided on the outside of the heat exchange section, and a plurality of outer and middle axial flow blades are provided in each group, and a second fluid input pipe and a second fluid output pipe are provided on the heat exchanger outer shell.

[0006] Furthermore, a plurality of groups of inner axial flow blades are provided inside the heat exchange section of the inner tube of the heat exchanger, and a plurality of inner axial flow blades are provided in each group.

[0007] Furthermore, the outer axial flow blades and the inner axial flow blades have the same rotation direction.

[0008] Furthermore, the outer axial flow blades and the inner axial flow blades have opposite rotation directions.

[0009] Furthermore, the outer axial flow blades and the inner tube of the heat exchanger are integrally formed, and the inner axial flow blades and the inner tube of the heat exchanger are integrally formed.

[0010] Furthermore, the outer axial flow blades and the inner tube of the heat exchanger adopt a plug-in structure, and the inner axial flow blades and the inner tube of the heat exchanger adopt a plug-in structure. The inner tube of the heat exchanger is provided with plug-in holes that cooperate with the outer axial flow blades and the inner axial flow blades. The outer axial flow blades and the inner axial flow blades are installed in the plug-in holes and welded fixed.

[0011] Furthermore, ten groups of outer axial flow blades are provided, and in each group, there are twelve outer axial flow blades evenly distributed around the circumference.

[0012] Furthermore, two first ball bearings are provided between the heat exchanger shell and the heat exchanger inner tube, two second ball bearings are provided between the liquid outlet cavity and the heat exchanger inner tube, and a third ball bearing is provided between the liquid inlet cavity and the heat exchanger inner tube.

[0013] Furthermore, a connecting sleeve is provided at the closed end of the inner tube of the heat exchanger, and the output shaft of the motor is fixedly connected to the connecting sleeve.

[0014] The beneficial effects of the present invention are:

[0015] The integrated axial-flow blade shell-and-tube heat exchanger device of the present invention, when the shell-and-tube heat exchanger is in operation, is driven to rotate the inner tube of the heat exchanger by an electric motor. Since the inner and outer walls of the inner tube of the heat exchanger have multiple sets of axial-flow blades, the rotation of the blades provides pumping force to the fluid in the shell and tube, driving the fluid to circulate. By setting the rotation direction of the axial-flow blades on the inner and outer walls of the inner tube, the two fluids can be circulated in the forward and reverse directions. Compared with the traditional dual-pump shell-and-tube heat exchanger, the integrated axial-flow blade shell-and-tube heat exchanger device no longer requires dual pumps to achieve the circulation of the two fluids. At the same time, the added axial-flow blades can not only increase the heat exchange area, but also apply radial force to the fluid, destroying the laminar boundary layer of the fluid near the wall, increasing disturbance, and strengthening the heat exchange capacity between the cold and hot fluids. By replacing the dual-pump system with a motor, not only is energy consumption reduced, costs are reduced, and the volume is reduced, but the fluid also has a higher flow rate.

[0016] The present invention achieves directional fluid transport by varying the rotational direction of the outer and inner axial flow blades. The inner and outer axial flow blades not only provide axial force, increasing fluid velocity and pumping force to achieve fluid circulation, but also radial force, which not only radially flushes the fluid against the wall to prevent fouling, but also disrupts the boundary layer, increasing fluid turbulence and enhancing heat transfer between the hot and cold fluids. Furthermore, the inner and outer axial flow blades increase the heat exchange area of the heat exchange tubes, significantly enhancing heat transfer.

[0017] This invention utilizes the high-speed rotation of the motor to drive the high-speed axial flow blades in the inner tube, increasing fluid turbulence and velocity, thereby enhancing heat exchange between the cold and hot fluids and improving heat exchange efficiency. The high-speed rotation of the axial flow blades creates intense turbulence, repeatedly flushing the walls and preventing the adhesion of dirt. Compared to dual-pump systems, motor-driven fluid flow is less expensive, smaller, and easier to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the heat exchanger with the outer shell, liquid outlet cavity and liquid inlet cavity removed;

[0020] Figure 3 It is the front view of the inner tube of the heat exchanger;

[0021] Figure 4 for Figure 3 Cross-sectional view of AA in the figure.

[0022] The main components in the figure are marked as follows:

[0023] 1. Heat exchanger inner tube; 11. Heat exchange section; 12. Medium outlet section; 13. Outer axial-flow blades; 14. Inner axial-flow blades; 15. Liquid outlet; 2. Heat exchanger outer shell; 21. Second fluid inlet pipe; 22. Second fluid outlet pipe; 23. First ball bearing; 3. Liquid outlet cavity; 31. First fluid outlet pipe; 32. Second ball bearing; 4. Liquid inlet cavity; 41. Third ball bearing; 5. Motor; 6. First fluid inlet pipe. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0025] Example 1

[0026] like Figures 1 to 4 As shown, the heat exchanger inner tube 1 is closed at one end, and the closed end of the heat exchanger inner tube 1 is connected to the output end of the motor 5. The motor drives the heat exchanger inner tube 1 to rotate. The open end of the heat exchanger inner tube 1 is rotationally sealed and connected to the liquid inlet cavity 4. The liquid inlet cavity 4 is fixedly connected to the first fluid input pipe 6.

[0027] The heat exchanger inner tube 1 includes a closed-end medium outflow section 12 and a central heat exchange section 11. The medium outflow section 12 is externally connected to a liquid outlet cavity 3 in a rotating seal. The medium outflow section 12 is provided with a plurality of liquid outlet holes 15 communicating with the liquid outlet cavity 3. These holes 15 are arranged in a circular array and serve as outlets for the heat exchanger inner tube 1. This ensures that the fluid after heat exchange can flow smoothly out of the heat exchanger even when the heat exchanger inner tube 1 rotates at high speed. Specifically, the high-speed rotation of the heat exchanger inner tube 1 causes the fluid to be thrown out of the heat exchanger inner tube 1 through the liquid outlet holes 15 under the action of centripetal force, and then collected in the liquid inlet cavity 4 for circulation. A first fluid output pipe 31 is provided on the liquid outlet cavity 3 for fluid discharge. The heat exchange section 11 is externally connected to the heat exchanger housing 2 in a rotating, sealable manner. Several groups of external axial-flow blades 13 are provided on the exterior of the heat exchange section 11. Each group includes a plurality of external axial-flow blades 13. In this embodiment, ten groups of external axial-flow blades 13 are provided, with twelve blades 13 evenly distributed around the circumference of each group. A second fluid inlet pipe 21 and a second fluid outlet pipe 22 are provided on the heat exchanger housing 2. These second fluid inlet pipes 21 and second fluid outlet pipes 22 are used to connect to the heat exchange pipeline to facilitate the outflow of the heat exchange fluid.

[0028] The first fluid output pipe 31 cooperates with the first fluid input pipe 6 to input cold fluid or hot fluid, and the second fluid input pipe 21 cooperates with the second fluid output pipe 22 to input cold fluid or hot fluid.

[0029] When hot fluid is input from the first fluid input pipe 6 and cold fluid is input from the second fluid input pipe 21 , the hot fluid and the cold fluid perform heat exchange in the heat exchange section 11 to achieve heat exchange.

[0030] When the cold fluid is input from the first fluid input pipe 6 and the hot fluid is input from the second fluid input pipe 21 , the hot fluid and the cold fluid perform heat exchange in the heat exchange section 11 to achieve heat exchange.

[0031] Two first ball bearings 23 are provided between the heat exchanger housing 2 and the heat exchanger inner tube 1, two second ball bearings 32 are provided between the liquid outlet cavity 3 and the heat exchanger inner tube 1, and a third ball bearing 41 is provided between the liquid inlet cavity 4 and the heat exchanger inner tube 1. The provision of the external axial flow blades 13, the second ball bearings 32, and the third ball bearings 41 allows for smoother rotation of the heat exchanger inner tube 1.

[0032] The closed end of the heat exchanger inner tube 1 is provided with a connecting sleeve, to which the output shaft of the motor 5 is fixedly connected. Alternatively, the heat exchanger inner tube 1 can be welded to a solid shaft with a smaller radius. The top of the solid shaft has a key hole, which is fixedly connected to the output shaft of the motor 5 through the key hole.

[0033] Example 2

[0034] The difference between Example 2 and Example 1 is that the heat exchange section of the heat exchanger inner tube 1 of Example 2 is further provided with several groups of inner axial flow blades 14, and each group is provided with several inner axial flow blades 14. The number of groups and the number of inner axial flow blades 14 can be the same as those of the outer axial flow blades 13, and the specific number can be increased or decreased according to actual needs. Among them, the outer axial flow blades 13 and the inner axial flow blades 14 have the same rotation direction, which can achieve the downstream flow of the two fluids. The outer axial flow blades 13 and the heat exchanger inner tube 1 are integrally formed, and the inner axial flow blades 14 and the heat exchanger inner tube 1 are integrally formed. The heat exchanger inner tube 1, the outer axial flow blades 13 and the heat exchanger inner tube 1 can be integrally cast or three-dimensionally printed with metal to obtain a heat exchanger inner tube 1 with an integrated structure. The outer axial flow blades 13 and inner axial flow blades 14 not only provide axial force to increase the fluid flow rate and provide axial pumping force to achieve fluid circulation, but also provide radial force, which not only allows the fluid to radially flush the wall to prevent fouling, but also destroys the boundary layer, increases the turbulence of the fluid, and enhances heat transfer between the cold and hot fluids. At the same time, the outer axial flow blades 13 and inner axial flow blades 14 greatly increase the axial flow blade area, increasing the heat exchange area of the inner heat exchange tube 1 and enhancing the heat exchange of the fluid.

[0035] Example 3

[0036] The difference between Example 3 and Example 2 is that the outer axial flow blades 13 and the inner axial flow blades 14 in Example 3 have opposite rotation directions, which can achieve countercurrent flow of the two fluids. By changing the rotation direction of the blades, directional transport of the fluid can be achieved.

[0037] Example 4

[0038] The difference between Example 4 and Example 2 is that in Example 4, the outer axial-flow blades 13 and the inner tube 1 of the heat exchanger are connected by a plug-in structure, and the inner axial-flow blades 14 and the inner tube 1 of the heat exchanger are connected by a plug-in structure. The inner tube 1 of the heat exchanger is provided with a plug-in hole for the outer axial-flow blades 13 and the inner axial-flow blades 14. The outer axial-flow blades 13 and the inner axial-flow blades 14 are installed in the plug-in hole and welded to the inner tube 1. The inner axial-flow blades 14 and the outer axial-flow blades 13 are manufactured separately. The plug-in hole is opened in the inner tube of the heat exchanger by laser cutting. The outer axial-flow blades 13 and the inner axial-flow blades 14 are then plugged and fixed to the plug-in hole respectively. The outer axial-flow blades 13 and the inner axial-flow blades 14 are then welded to the plug-in hole from the outside. The welds are then polished. The separation structure design of the heat exchanger inner tube 1 and the outer axial flow blades 13 and the inner axial flow blades 14 makes the manufacture of the heat exchanger inner tube 1 simpler and the quality more controllable.

Claims

1. An integrated axial flow pump blade shell and tube heat exchanger, characterized in that: It comprises a heat exchanger inner tube (1) with one end closed, the closed end of the heat exchanger inner tube (1) being connected to the output end of a motor (5), the open end of the heat exchanger inner tube (1) being rotatably sealed and connected to a liquid inlet cavity (4), and the liquid inlet cavity (4) being fixedly connected to a first fluid input pipe (6); The heat exchanger inner tube (1) comprises a medium outflow section (12) at a closed end and a heat exchange section (11) located in the middle; The medium outflow section (12) is externally connected to a liquid outlet cavity (3) in a rotary seal, the medium outflow section (12) is provided with a plurality of liquid outlet holes (15) communicating with the liquid outlet cavity (3), and the liquid outlet cavity (3) is provided with a first fluid output pipe (31); The heat exchange section (11) is externally connected to a heat exchanger housing (2) in a rotating seal manner. A plurality of groups of external axial flow blades (13) are provided on the outside of the heat exchange section (11), with each group including a plurality of external axial flow blades (13). A second fluid input pipe (21) and a second fluid output pipe (22) are provided on the heat exchanger housing (2).

2. The integrated axial flow pump blade-tube heat exchanger according to claim 1, characterized in that: Several groups of inner axial flow blades (14) are arranged inside the heat exchange section of the inner tube (1) of the heat exchanger, and several inner axial flow blades (14) are arranged in each group.

3. The integrated axial flow pump blade-tube heat exchanger according to claim 2, characterized in that: The outer axial flow blades (13) and the inner axial flow blades (14) have the same rotation direction.

4. The integrated axial flow pump blade-tube heat exchanger according to claim 2, characterized in that: The outer axial flow blades (13) and the inner axial flow blades (14) have opposite rotation directions.

5. The integrated axial flow pump blade-tube heat exchanger according to claim 2, characterized in that: The outer axial flow blades (13) and the inner tube (1) of the heat exchanger are integrally formed, and the inner axial flow blades (14) and the inner tube (1) of the heat exchanger are integrally formed.

6. The integrated axial flow pump blade-tube heat exchanger according to claim 2, characterized in that: The outer axial flow blades (13) and the inner tube (1) of the heat exchanger adopt a plug-in structure, and the inner axial flow blades (14) and the inner tube (1) of the heat exchanger adopt a plug-in structure. The inner tube (1) of the heat exchanger is provided with plug-in holes that match the outer axial flow blades (13) and the inner axial flow blades (14). The outer axial flow blades (13) and the inner axial flow blades (14) are installed in the plug-in holes and fixed by welding.

7. The integrated axial flow pump blade-tube heat exchanger according to claim 1, characterized in that: Ten groups of outer axial flow blades (13) are provided, and in each group, twelve outer axial flow blades (13) are evenly distributed around the circumference.

8. The integrated axial flow pump blade-tube heat exchanger according to claim 1, characterized in that: The closed end of the heat exchanger inner tube (1) is provided with a connecting sleeve, and the output shaft of the motor (5) is fixedly connected to the connecting sleeve.

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