Water pressure expansion pipe water return system

Abstract

The utility model relates to the field of water pressure pipe expansion water return systems, in particular to a water pressure pipe expansion water return system which comprises a water return device and a water pressure pipe expander, the water return device comprises a water return tank and a first return pipe, and the water return tank comprises a water tank water inlet pipe and a water tank water outlet pipe; the water pressure pipe expander comprises a pipe expander water inlet communicated with the water tank water outlet pipe, a pressure relief opening communicated with the first backflow pipe and a pipe expander water outlet, the pipe expander water outlet is connected with the pipe expander water outlet pipe, and the end, away from the water pressure pipe expander, of the pipe expander water outlet pipe is communicated with one end of the heat exchange pipe. Effective recycling of water resources in the water pressure pipe expansion operation process is achieved, the problem of unstable connection caused by too large water pressure is avoided, and meanwhile the stability of the system and the water resource utilization rate are remarkably improved through reasonable structural design.

Description

A water pressure expansion tube return water system Technical Field

[0001] This application relates to the field of hydraulic expansion tube return water systems, and in particular to a hydraulic expansion tube return water system. Background Technology

[0002] Water expansion is an important processing technology used in the manufacture of tube-fin heat exchangers and other fields. Water expansion involves injecting water at a certain pressure into the heat exchange tubes, using the water pressure to cause plastic deformation of the heat exchange tubes, causing their diameter to expand, thereby tightly bonding with components such as fins, achieving the purpose of enhancing heat transfer effect and improving connection strength.

[0003] Currently, before water expansion of stainless steel tube-fin heat exchangers, directly injecting water using the electric high-pressure water pump that comes with the water pressure tube expander can effectively increase the water injection speed. However, excessive water pressure and flow may occur, and the water flow impacting the outlet pipe of the water pressure tube expander may cause the outlet pipe to detach from the heat exchange tube. If a high-pressure overflow port is installed, a large amount of overflow water will be depressurized and lost. Summary of the Invention

[0004] The purpose of this application is to overcome the above-mentioned technical problems and provide a water pressure expansion tube return water system.

[0005] A hydraulic tube expansion and return water system is used in the hydraulic expansion process of a tube-fin heat exchanger, wherein the heat exchanger includes heat exchange tubes, and the hydraulic tube expansion and return water device includes:

[0006] The water return device includes a water return tank and a first return pipe. The water return tank includes a water tank inlet pipe and a water tank outlet pipe.

[0007] The hydraulic tube expander includes a tube expander inlet connected to the water outlet pipe of the water tank, a pressure relief port connected to the first return pipe, and a tube expander outlet. The tube expander outlet is connected to the tube expander outlet pipe, and one end of the tube expander outlet pipe away from the hydraulic tube expander is connected to one end of the heat exchange tube.

[0008] By adopting the above scheme, the water pressure tube expander injects water through the tube expander outlet pipe to expand the heat exchange tubes. When the water pressure of the water pressure tube expander is too high, it will cause instability at the connection between the heat exchange tube and the tube expander outlet pipe. The setting of the pressure relief port can reduce the water pressure. The first return pipe is connected to the return water tank, and the overflow water flows back to the return water tank through the first return pipe to prevent the waste of overflow water.

[0009] In one embodiment, the water return device further includes a second return pipe, one end of which is connected to the water return tank, and the other end of which is connected to the end of the heat exchange tube away from the outlet pipe of the tube expander.

[0010] By adopting the above scheme, during the water expansion process, the excess water in the heat exchange tube can be returned to the return water tank through the second return pipe for reuse, thus avoiding the waste of water resources.

[0011] In one embodiment, the tube expander outlet is provided with a first outlet valve and an air source. The first outlet valve is connected to the air source, the tube expander outlet and the tube expander outlet pipe respectively. The top of the return water tank is provided with an exhaust port.

[0012] By adopting the above scheme, after the heat exchange tube expands with water, the air source injects compressed air into the water pressure tube expander and the tube expander's outlet pipe through the first outlet valve. The water remaining in the water pressure tube expander flows back to the return water tank through the first return pipe, and the water remaining in the heat exchange tube flows back to the return water tank through the second return pipe. This prevents water from splashing during the insertion and removal of pipes and the drainage process, thus avoiding waste of water resources.

[0013] In one embodiment, the end of the second return pipe away from the return water tank is provided with a second outlet valve and an exhaust valve, and the second outlet valve is connected to the heat exchange pipe, the exhaust valve and the second return pipe respectively.

[0014] By adopting the above solution, residual air may remain in the return water device during the water injection process, or some air may be carried away by the water flow. If this air is not discharged in time, it will occupy the space inside the heat exchanger, affecting the water injection speed and effect, causing the heat exchanger to not be completely filled with water, and thus reducing the heat exchange efficiency. The air vent valve can discharge this accumulated air during water injection, ensuring a smooth water injection process.

[0015] In one embodiment, the water tank outlet pipe is connected to an automatic start-stop water pump, and the end of the automatic start-stop water pump away from the water tank outlet pipe is connected to an expander inlet pipe that communicates with the expander inlet. The automatic start-stop water pump can sense the water pressure in the expander inlet pipe.

[0016] By adopting the above scheme, the self-starting and stopping water pump delivers water from the return water tank to the water pressure tube expander. At the same time, the water inlet volume can be controlled according to the water pressure to prevent the connection of the tube expander's water inlet pipe from becoming unstable due to excessive water pressure.

[0017] In one embodiment, the water tank outlet pipe extends from one end away from the self-starting and stopping water pump toward the bottom of the return water tank, and the extended end is provided with an inlet filter screen.

[0018] By adopting the above solution, impurities may be discharged into the return water tank during the water expansion process. These impurities may clog the heat exchanger pipes and affect the heat exchange effect. By installing an inlet filter screen at the extended end of the water tank outlet pipe, the filter screen can prevent impurities from entering the water pressure tube expander.

[0019] In one embodiment, the water tank has a drain outlet at the bottom.

[0020] By adopting the above solution, impurities that settle at the bottom of the water tank can be discharged from the water tank's drain outlet.

[0021] In one embodiment, the bottom of the return water tank is shaped like a frustum with the top surface facing down, and the drain outlet is located on the bottom surface of the frustum.

[0022] By adopting the above solution, the sediment at the bottom of the water tank can be concentrated at the drain outlet, making it easier to discharge impurities.

[0023] In one embodiment, the water tank inlet pipe extends into the return water tank, and the extended end of the water tank inlet pipe is higher than the inlet filter and is equipped with a water level control valve.

[0024] By adopting the above scheme, the inlet control valve can control the opening and closing of the water tank inlet pipe according to the water level, thereby controlling the water level in the return water tank and preventing water from overflowing from the return water tank.

[0025] In one embodiment, the return water tank is provided with a baffle, which is located on one side of the water inlet pipe of the water tank and has a water inlet hole at the bottom.

[0026] By adopting the above solution, since the extension end of the water tank inlet pipe is relatively high, when the water flows out of the water tank inlet pipe, the water is prone to impact the bottom surface of the return water tank, which causes impurities at the bottom of the return water tank to be rolled up, affecting the sewage discharge effect of the drain outlet. The baffle plate can reduce the water flow rate, thereby preventing impurities from being rolled up.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The water pressure tube expander injects water through the tube expander's outlet pipe to expand the heat exchange tubes. If the water pressure of the water pressure tube expander is too high, the connection between the heat exchange tubes and the tube expander's outlet pipe will be unstable. The setting of the pressure relief port can reduce the water pressure. Connect the first return pipe to the return water tank, and the overflow water will flow back to the return water tank through the first return pipe to prevent the waste of overflow water.

[0029] 2. Currently, the open-type compressed air method is used to accelerate drainage. During the insertion and removal of connectors and drainage, there is a problem of on-site water splashing and a large amount of water loss that cannot be recycled. After the heat exchange tube expands, the air source injects compressed air into the water pressure tube expander and the tube expander's outlet pipe through the first outlet valve. The water remaining in the water pressure tube expander flows back to the return water tank through the first return pipe, and the water remaining in the heat exchange tube flows back to the return water tank through the second return pipe. This prevents water splashing during the insertion and removal of pipes and drainage, thus avoiding waste of water resources.

[0030] 3. During the water expansion process, impurities may be discharged into the return water tank. These impurities may clog the heat exchanger pipes and affect the heat exchange effect. By installing an inlet filter at the extended end of the water tank outlet pipe, the filter can prevent impurities from entering the water pressure tube expander. Through the drain outlet and the bottom of the return water tank, the sediment at the bottom of the water tank can gather at the drain outlet, making it easier to discharge impurities. Attached Figure Description

[0031] Figure 1 is a structural schematic diagram of a water pressure expansion tube return water system provided in this application.

[0032] Figure 2 is a schematic diagram of the return water tank.

[0033] Figure 3 is a schematic diagram of the structure of a hydraulic tube expander.

[0034] Figure 4 is a schematic diagram of the heat exchanger.

[0035] Explanation of reference numerals in the attached drawings: 1. Water return device; 11. Water return tank; 111. Water tank inlet pipe; 1111. Water level control valve; 112. Water tank outlet pipe; 1121. Water inlet filter; 113. Vent; 114. Automatic start / stop water pump; 115. Sewage outlet; 116. Baffle; 1161. Water inlet hole; 12. First return pipe; 13. Second return pipe; 131. Second outlet valve; 1311. Vent valve; 2. Water pressure tube expander; 21. Tube expander inlet; 211. Tube expander inlet pipe; 22. Pressure relief port; 23. Tube expander outlet; 231. Tube expander outlet pipe; 232. First outlet valve; 233. Air source; 3. Heat exchanger; 31. Heat exchange tube. Detailed Implementation

[0036] Therefore, it is necessary to provide a water pressure expansion tube return water device 1 that enables the recycling of water resources.

[0037] Please refer to Figures 1-2. Figure 1 is a schematic diagram of a hydraulic tube expander return water system provided in the first embodiment of this application, including: a return water device 1 and a hydraulic tube expander 2. The return water device 1 includes a return water tank 11, a first return pipe 12, and a second return pipe 13. The hydraulic tube expander 2 includes a tube expander inlet 21 connected to the water tank outlet pipe 112, a pressure relief port 22 connected to the first return pipe 12, and a tube expander outlet 23. The tube expander outlet 23 is connected to the tube expander outlet pipe 231, and the end of the tube expander outlet pipe 231 away from the tube expander is connected to one end of the heat exchange tube 31, achieving the effect of effectively recovering overflow water and preventing water waste.

[0038] The return water tank 11 includes a water tank inlet pipe 111 and a water tank outlet pipe 112. The water tank inlet pipe 111 connects to the water source and can be made of steel or plastic; the material can be selected based on actual needs, using corrosion-resistant materials such as stainless steel or PVC. The water tank outlet pipe 112 also uses steel or plastic, and its end extends towards the bottom of the return water tank 11, with an inlet filter screen 1121 at the extended end. The inlet filter screen 1121 can be made of stainless steel mesh or nylon mesh. The function of the inlet filter screen 1121 is to prevent impurities in the return water tank 11 from entering the water pressure tube expander 2, thus preventing impurities from clogging the pipes.

[0039] The bottom of the return water tank 11 is equipped with a drain port 115, which can be either a manual or electric valve, depending on the actual needs. Furthermore, the drain port 115 can be equipped with adjustment components, such as a rotatable drain guide plate or a retractable drain pipe, to adapt to different operating conditions and further improve drain efficiency. The bottom of the return water tank 11 is shaped like a frustum with its top surface facing downwards, and the drain port 115 is located on the bottom surface of the frustum. The frustum-shaped design allows sediment in the return water tank 11 to accumulate towards the drain port 115, facilitating draining operations. The drain port 115 can be either a manual or electric valve, depending on the actual needs. The frustum-shaped design guides sediment to accumulate towards the drain port 115, reducing impurity residue and improving the cleanliness of the return water tank 11.

[0040] The water inlet pipe 111 extends into the return water tank 11, with its extended end higher than the inlet filter 1121 and equipped with a water level control valve 1111. The water level control valve 1111 can be a float-type water level valve or a liquid level sensor control valve, with the control method selected according to actual needs. When the liquid level in the return water tank 11 is too high, the water level control valve 1111 can close the water inlet pipe 111 to prevent water from overflowing from the return water tank 11. A baffle 116 is provided inside the return water tank 11, located on one side of the water inlet pipe 111, and has a water inlet hole 1161 at its bottom. The baffle 116 can be made of stainless steel or plastic, with a thickness that can be set between 3mm and 5mm according to actual needs. The diameter of the water inlet hole 1161 can be set between 10mm and 20mm according to actual needs. When water flows out of the water tank inlet pipe 111, the baffle 116 can block the water flow and prevent the water flow from directly impacting the bottom of the water tank, causing impurities at the bottom of the return water tank 11 to be rolled up. The water flow can then flow down along the baffle 116 and into the return water tank 11 through the water inlet hole 1161.

[0041] Please refer to Figures 3-4. Figure 3 is a structural schematic diagram of the hydraulic tube expander 2, which includes a tube expander inlet 21, a pressure relief port 22, and a tube expander outlet 23. The tube expander inlet 21 is connected to the water tank outlet pipe 112 via a tube expander inlet pipe 211. A ball valve is installed at the connection between the water tank outlet pipe 112 and the tube expander inlet 21, which controls the opening and closing of the tube expander inlet 21. The tube expander inlet pipe 211 can be a high-pressure hose or a metal pipe, and the material must have certain flexibility and pressure resistance. The pressure relief port 22 is connected to the return water tank 11 via a first return pipe 12. The first return pipe 12 can be a rubber hose or a polyurethane hose, which has good flexibility and corrosion resistance. The tube expander outlet 23 is connected to one end of the heat exchange tube 31 via the tube expander outlet pipe 231. The tube expander outlet pipe 231 can be made of metal or reinforced plastic. The extended end of the tube expander outlet pipe 231 is equipped with a heat exchanger 3 inlet clamp for fixing the tube expander outlet pipe 231 and the heat exchange tube 31.

[0042] The self-starting and stopping water pump 114 is located between the water tank outlet pipe 112 and the tube expander inlet pipe 211. An internal pressure sensor is installed in the self-starting and stopping water pump 114. The pressure sensor detects changes in water pressure within the tube expander inlet pipe 211 and transmits the signal to the water pump controller. When the water pressure is lower than the set value, the controller starts the water pump, delivering water from the return water tank 11 to the water expander 2. When the water pressure reaches the set value, the controller stops the water pump. This design effectively maintains the stability of the water pressure within the water expander 2, avoiding connection instability caused by excessively high water pressure.

[0043] In this application, a first outlet valve 232 and an air source 233 are provided at the outlet 23 of the tube expander. The first outlet valve 232 is connected to the air source 233, the outlet 23 of the tube expander, and the outlet pipe 231 of the tube expander. An exhaust port 113 is provided at the top of the return water tank 11. The air source 233 can be a compressed air tank or an air compressor. The first outlet valve 232 is an ultra-high pressure three-way valve. One end of the second return pipe 13 is connected to the return water tank 11, and the other end is connected to the end of the heat exchange tube 31 away from the outlet pipe 231 of the tube expander. A second outlet valve 131 is provided at the end of the second return pipe 13 away from the return water tank 11. The second outlet valve 131 is connected to the heat exchange tube 31, the exhaust valve 1311, and the second return pipe 13. The second return pipe 13 can be made of the same material as the first return pipe 12, such as a rubber tube or a polyurethane tube. The second outlet valve 131 is also an ultra-high pressure three-way valve.

[0044] In actual use, residual air may exist in the return water device 1, or some air may be carried away by the water flow. If this air is not discharged in time, it will occupy the space inside the heat exchanger 3, affecting the speed and effect of water injection, causing the heat exchanger 3 to not be completely filled with water, thereby reducing the heat exchange efficiency. The air vent valve 1311 can discharge this accumulated air during water injection, ensuring that the water injection process proceeds smoothly. After the heat exchange tube 31 undergoes the tube expansion process, during the drainage process, the air source 233 injects compressed air into the water pressure tube expander 2 and the tube expander outlet pipe 231 through the first outlet valve 232. The residual water in the water pressure tube expander 2 flows back to the return water tank 11 through the first return pipe 12, and the residual water in the heat exchange tube 31 flows back to the return water tank 11 through the second return pipe 13, preventing water splashing during pipe insertion and drainage, thus avoiding waste of water resources.

[0045] The workflow of this application is as follows: During water injection, the ball valve at the inlet of the water pressure tube expander 2 is opened, and the self-starting and stopping water pump 114 on the return water tank 11 starts working to supply water to the expander. At the same time, the water pressure tube expander 2 is operated to inject water into the heat exchanger 3 pipeline. During the water injection process, the instantaneous high-pressure water generated by the electric water pump of the water pressure tube expander 2 flows back to the return water tank 11 through the pressure relief port 22 and the first return pipe 12, thereby preventing the high-pressure water from overflowing from the pressure relief port 22 and causing water waste, and removing excess water in the heat exchange tube 31. During drainage, the air source 233 inputs compressed air into the first outlet valve 232, and the residual water in the heat exchange tube 31 flows back to the return water tank 11 through the second return pipe 13. The residual water in the water pressure tube expander 2 flows back to the return water tank 11 through the first return pipe 12, and the compressed air is discharged through the exhaust port 113 at the top of the return water tank 11.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A water pressure expansion tube return system for a tube-fin heat exchanger (3) water expansion process, wherein the heat exchanger (3) includes heat exchange tubes (31), characterized in that, include: The water return device (1) includes a water return tank (11) and a first return pipe (12). The water return tank (11) includes a water tank inlet pipe (111) and a water tank outlet pipe (112). The water pressure tube expander (2) includes a tube expander inlet (21) connected to the water tank outlet pipe (112), a pressure relief port (22) connected to the first return pipe (12), and a tube expander outlet (23). The tube expander outlet (23) is connected to the tube expander outlet pipe (231). The end of the tube expander outlet pipe (231) away from the water pressure tube expander (2) is connected to one end of the heat exchange tube (31).

2. The water pressure expansion tube return water system according to claim 1, characterized in that: The water return device (1) also includes a second return pipe (13), one end of which is connected to the water return tank (11), and the other end is connected to the end of the heat exchange tube (31) away from the outlet pipe (231) of the tube expander.

3. The water pressure expansion tube return water system according to claim 1, characterized in that: The tube expander outlet (23) is provided with a first outlet valve (232) and an air source (233). The first outlet valve (232) is connected to the air source (233), the tube expander outlet (23) and the tube expander outlet pipe (231) respectively. The top of the return water tank (11) is provided with an exhaust port (113).

4. A water pressure expansion tube return system according to claim 2, characterized in that: The second return pipe (13) is provided with a second outlet valve (131) and an exhaust valve (1311) at the end away from the return water tank (11). The second outlet valve (131) is connected to the heat exchange pipe (31), the exhaust valve (1311) and the second return pipe (13) respectively.

5. A water pressure expansion tube return water system according to claim 1, characterized in that: The water tank outlet pipe (112) is connected to the self-starting and stopping water pump (114). The end of the self-starting and stopping water pump (114) away from the water tank outlet pipe (112) is connected to the tube expander inlet pipe (211) which is connected to the tube expander inlet (21). The self-starting and stopping water pump (114) can sense the water pressure in the tube expander inlet pipe (211).

6. A water pressure expansion tube return system according to claim 5, characterized in that: The water tank outlet pipe (112) extends from the end opposite to the self-starting and stopping water pump (114) toward the bottom of the return water tank (11), and the extended end is provided with an inlet filter screen (1121).

7. A water pressure expansion tube return water system according to claim 6, characterized in that: The bottom of the water tank is equipped with a drain outlet (115).

8. A water pressure expansion tube return water system according to claim 7, characterized in that: The bottom of the return water tank (11) is a frustum with the top surface facing down, and the drain outlet (115) is located on the bottom surface of the frustum.

9. A water pressure expansion tube return water system according to claim 6, characterized in that: The water tank inlet pipe (111) extends into the return water tank (11), and the extended end of the water tank inlet pipe (111) is higher than the water inlet filter (1121) and is equipped with a water level control valve (1111).

10. A water pressure expansion tube return system according to claim 9, characterized in that: The return water tank (11) is provided with a baffle (116), which is located on one side of the water tank inlet pipe (111) and has a water inlet hole (1161) at the bottom.

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