Corrosion-resistant rectangular expansion water tank

Abstract

The utility model provides a corrosion-resistant rectangular expansion water tank, which is characterized in that a rubber diaphragm is arranged in an outer shell to divide a water accommodating cavity communicated with a liquid inlet pipe and an air accommodating cavity communicated with an air inlet pipe; the corrosion-resistant coating arranged on the inner wall of the outer shell is matched with the nickel-plated protective layers arranged on the inner surface and the outer surface of the liquid inlet pipe, so that the expansion water tank and the related liquid receiving structure thereof are prevented from being corroded or rusted by water liquid due to direct and long-time contact with the water liquid; meanwhile, a filter screen structure capable of being opened and closed in a one-way mode is arranged on an outlet of the liquid inlet pipe and matched with a reset assembly and a limiting groove which are arranged on the inner wall of the liquid inlet pipe, so that impurities carried when water enters the expansion water tank are filtered out in a one-way mode, and corrosion of the impurities to the interior of the expansion water tank is avoided to the maximum extent; the composite fiber strips wound at intervals are arranged on the inner wall of the liquid inlet pipe and matched with the annular sealing ring arranged at the outer end of the outer outlet of the liquid inlet pipe, so that a good leakage-proof function at the joint is guaranteed; according to the scheme, the corrosion resistance of the expansion water tank is improved, the service life of the expansion water tank is prolonged, and the product competitiveness is improved.

Description

Technical Field

[0001] This utility model belongs to the field of expansion tank technology, specifically relating to a corrosion-resistant rectangular expansion tank. Background Technology

[0002] Expansion tanks are crucial components in wall-hung boilers and HVAC systems. In heating systems, they serve to hold water and maintain pressure. Due to the thermal expansion and contraction of water in the heating system, the water volume increases as the system heats up. When there is nowhere to accommodate this expansion, the water pressure in the heating system rises, affecting normal operation. The expansion tank accommodates this expansion, reducing pressure fluctuations caused by water expansion. When the system leaks or cools down for any reason, the expansion tank replenishes the system with water. Therefore, the point where the expansion tank connects to the system is often considered a pressure stabilization or constant pressure point, thus ensuring the system's pressure stability. Ensuring the system does not empty, overflow, or overpressure improves the safety and reliability of system operation. Meanwhile, the expansion tank is often connected to the inlet of the water pump, and its pressure-regulating function provides some protection for the pump. However, existing expansion tanks, lacking corresponding anti-corrosion measures, are susceptible to corrosion from the water or impurities within it during prolonged use. This damage leads to a shorter lifespan for the expansion tank, causing significant inconvenience to the normal operation of the heating system. Furthermore, repairing or replacing them increases economic costs.

[0003] In response to the aforementioned phenomena and problems, in-depth research was conducted, and a corrosion-resistant rectangular expansion tank was proposed, which improved the corrosion resistance of the expansion tank, extended the service life of the product, and increased the product's competitiveness. Utility Model Content

[0004] To address the aforementioned problems, this invention proposes a corrosion-resistant rectangular expansion tank. A protective layer is provided on the surface of the part that comes into contact with the liquid, and a special filter structure is installed in the inlet pipe to improve the corrosion resistance of the expansion tank, extend the service life of the product, and increase the product's competitiveness.

[0005] To achieve the above objectives, this utility model provides a corrosion-resistant rectangular expansion tank, comprising an outer shell, a liquid inlet pipe, and an air inlet pipe. The inner wall of the outer shell is coated with a corrosion-resistant coating, and a rubber diaphragm is disposed inside it. The rubber diaphragm divides the interior of the outer shell into an adjustable-sized air-receiving cavity and a water-receiving cavity. The liquid inlet pipe communicates with the water-receiving cavity, and the air inlet pipe communicates with the air-receiving cavity. The inner wall and outer surface of the liquid inlet pipe are coated with a nickel-plated protective layer, and the pipe includes a tube penetrating the outer shell, an outlet located outside the outer shell, and a portion located in the water-receiving cavity. An inner outlet is provided at the inner outlet, which is equipped with a filter structure that can be opened and closed in one direction. The filter structure includes a filter, a hinge, and a limiting member. An auxiliary soft sheet is provided on the side of the filter facing the inner outlet, and one end of the auxiliary soft sheet is fixed on the filter at the position of the hinge. The hinge and the limiting member are symmetrically arranged at both ends of the filter, and the hinge is hinged to the inner wall of the tube on the side near the inner outlet. A reset component is provided on the inner wall of the tube on the side with the same position as the hinge, and a limiting groove is provided on the side opposite to the position of the hinge.

[0006] Preferably, an adjustment component is also provided, the adjustment component including an adjustment groove and an adjustment block; the adjustment groove is disposed on the inner wall of the tube on the side of the hinge near the outer outlet, and its length is the same as the diameter of the filter screen; the adjustment block is disposed on the inner wall of the tube on the side of the hinge near the inner outlet.

[0007] Preferably, the reset assembly includes a reset spring, a protective membrane, and a traction spring; two sets of reset springs are provided and are respectively disposed at both ends of the adjustment groove; the protective membrane is connected to the inner wall of the tube outside both ends of the adjustment groove; one end of the traction spring is connected to the filter screen near the hinge, and the other end is connected to the adjustment block.

[0008] Preferably, the inner wall of the tube is provided with a connecting threaded section, and a section of the connecting threaded section near the outer outlet is wound with composite fiber strips at intervals.

[0009] Preferably, an annular sealing ring is provided at the outer end of the outer outlet.

[0010] Preferably, the outer shell includes an upper shell, a lower shell, and a fixing member. The upper shell and the lower shell are symmetrically connected and the fixing member surrounds and wraps around the connection between the upper shell and the lower shell.

[0011] Preferably, a control valve is provided on the air intake pipe, and a cover is also provided on the outside of the control valve.

[0012] Preferably, the gas-containing cavity is pre-filled with a certain amount of nitrogen gas.

[0013] Preferably, the outer surface of the outer casing is provided with an anti-rust coating.

[0014] Preferably, a label groove is provided on the outer surface of the outer casing.

[0015] Compared to existing technologies, the advantages of this utility model are as follows: This utility model provides a corrosion-resistant rectangular expansion tank. The inner wall of the outer shell is coated with a corrosion-resistant coating. A rubber diaphragm is used to create a water-containing cavity connected to an inlet pipe and an air-containing cavity connected to an inlet pipe. The inner and outer surfaces of the inlet pipe are coated with a nickel-plated protective layer. A unidirectionally opening and closing filter structure is provided at the inner outlet of the inlet pipe located in the water-containing cavity. Through the cooperation of hinges and limiting members on the filter structure with a reset component and limiting groove on the inner wall of the inlet pipe, the filter structure can close when water enters the water-containing cavity and open when water flows out of the water-containing cavity. Furthermore… The inner wall of the tube is provided with composite fiber strips wound at intervals, and the outer end of the outlet is provided with an annular sealing ring. The corrosion-resistant coating on the inner wall of the outer shell and the nickel-plated protective layer on the inner and outer surfaces of the inlet pipe in this patent solution can prevent the expansion tank and its liquid-contacting structures from direct and prolonged contact with the liquid, thus preventing corrosion or rust. At the same time, the one-way opening and closing filter structure can filter out impurities carried by the liquid when it enters the expansion tank, minimizing the corrosion of the expansion tank interior by impurities. Furthermore, the annular sealing ring and the composite fiber strips work together to ensure good leak-proof function at the connection, improving its overall corrosion resistance, extending the product's service life, and increasing its competitiveness. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a corrosion-resistant rectangular expansion tank according to the present invention;

[0017] Figure 2 This is a three-dimensional schematic diagram of a corrosion-resistant rectangular expansion tank according to the present invention;

[0018] Figure 3 for Figure 1 A schematic diagram of the structure when water enters the expansion tank at point A;

[0019] Figure 4 for Figure 1 A schematic diagram of the structure when water is discharged from the expansion tank at point A.

[0020] In the diagram: 1-Outer shell, 11-Upper shell, 12-Lower shell, 13-Fixed component, 14-Corrosion resistant coating, 15-Rubber diaphragm, 16-Water chamber, 17-Gas chamber, 2-Inlet pipe, 21-Nickel-plated protective layer, 22-Annular sealing ring, 23-Filter screen, 24-Auxiliary soft sheet, 25-Hinge, 26-Limiting component, 27-Limiting groove, 28-Adjusting groove, 29-Adjusting block, 210-Reset spring, 211-Protective membrane, 212-Traction spring, 213-Composite fiber strip, 3-Inlet pipe, 31-Baffle. Detailed Implementation

[0021] To provide a more detailed description of this utility model, the following description is provided in conjunction with the accompanying drawings. It should be noted that the embodiments described below are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0022] See Figure 1 and Figure 2 This embodiment provides a corrosion-resistant rectangular expansion tank including an outer shell 1, a liquid inlet pipe 2, and an air inlet pipe 3. The outer shell 1 includes an upper shell 11, a lower shell 12, and a fixing member 13. The outer surfaces of the upper shell 11 and the lower shell 12 are provided with an anti-rust coating (not shown in the figure), and their inner walls are covered with a corrosion-resistant coating 14. The upper shell 11 and the lower shell 12 are symmetrically connected. The fixing member 13 surrounds the connection between the upper shell 11 and the lower shell 12. A receiving cavity is provided within the cavity formed between the upper shell 11 and the lower shell 12. A rubber diaphragm 15 divides the accommodating cavity into a gas accommodating cavity 17 and a water accommodating cavity 16 with adjustable space size. The water accommodating cavity 16 is connected to the liquid inlet pipe 2, and the gas accommodating cavity 17 is connected to the air inlet pipe 3. The gas accommodating cavity 17 is pre-filled with pressurized gas. In this embodiment, the pressurized gas is nitrogen gas at 1.0 Bar. A control valve (not shown in the figure) is provided on the air inlet pipe 3. A cover 31 is also provided on the outside of the control valve. A label groove (not shown in the figure) is provided on the outer surface of the outer shell 1.

[0023] See Figure 1 , Figure 2 , Figure 3 and Figure 4The inner and outer surfaces of the inlet pipe 2 are both provided with a nickel-plated protective layer 21. Specifically, it includes a pipe body, an outer outlet, and an inner outlet. The pipe body penetrates the lower housing 12, and a threaded section (not shown in the figure) is provided on the inner wall for connection. Composite fiber strips 213 are wound around the section of the threaded section near the outer outlet at intervals, and a limiting groove 27 is provided on the inner wall opposite to the position of the hinge 25. A reset component is provided on the side with the same position as the hinge 25. The inner outlet is located at one end of the pipe body near the water receiving cavity 16, where a filter structure that can be opened and closed in one direction and an adjustment component are provided. The outer outlet is located at one end of the pipe body outside the lower housing 12, and an annular sealing ring 22 is provided at its outer end. The annular sealing ring 22 and the composite fiber strips 213 cooperate with each other to ensure good leak-proof function at the connection and also avoid corrosion or rust of the inlet and outlet pipes by water.

[0024] The filter structure includes a filter screen 23, a hinge 25, and a limiting member 26. An auxiliary soft sheet 24 is provided on the side of the filter screen 23 facing the inner outlet. One end of the auxiliary soft sheet 24 is fixed to the filter screen 23 at the connection point with the traction spring 212. Its length is shorter than that of the filter screen 23 and can only cover the part of the filter screen 23 between the traction spring 212 and the limiting member 26. The hinge 25 and the limiting member 26 are symmetrically arranged at both ends of the filter screen 23, and the hinge 25 is hinged to the inner wall of the tube on the side near the inner outlet.

[0025] The adjustment assembly includes an adjustment groove 28 and an adjustment block 29. The adjustment groove 28 is disposed on the inner wall of the tube on the side of the hinge 25 near the outer outlet, and its length is the same as the diameter of the filter screen 23. The adjustment block 29 is disposed on the inner wall of the tube on the side of the hinge 25 near the inner outlet.

[0026] The reset assembly includes a reset spring 210, a protective membrane 211, and a traction spring 212. A set of reset springs 210 is provided at each end of the adjustment groove 28, and their initial length is the same as the height of the adjustment groove 28. The protective membrane 211 has a certain deformation capacity and is connected to the inner wall of the tube outside both ends of the adjustment groove 28, completely covering the adjustment groove 28 and the two sets of reset springs 210. One end of the traction spring 212 is connected to the filter screen 23 near the hinge 25, and the other end is connected to the adjustment block 29. An elastic membrane (not shown in the figure) is provided on the outside of the traction spring 212 to prevent direct contact with the water. In this embodiment, when the filter screen structure is opened, the filter screen 23 will remain in the adjustment groove 28 under the impact of the water, compressing the reset spring 210. After the water flows back, the reset spring 210 rebounds to its initial position, cooperating with the traction spring 212 to ensure that the filter screen 23 closes again.

[0027] In specific application scenarios, the water in the heating system undergoes volume changes due to thermal expansion and contraction. When heated, the water expands beyond the system's capacity and enters the water-receiving chamber 16 through the receiving pipe. Under pressure, the space of the air-receiving chamber 17 is compressed and reduced. As the water cools and its volume decreases, it flows back into the heating system under pressure. The space of the water-receiving chamber 16 decreases, and the space of the air-receiving chamber 17 expands back to its initial size. This process repeats continuously to fulfill the function of the expansion tank within the heating system, ensuring that the hot water supply system always maintains an appropriate pressure and liquid level range. During the process of water entering the water-receiving chamber 16 through the receiving pipe... In this process, the filter screen 23, under the impact of the water flow, cooperates with the limiting member 26 and the limiting groove 27 for limiting, and the traction of the traction spring 212 to close laterally at the inner outlet. The auxiliary soft sheet 24 opens towards the water receiving cavity 16 under the impact of the water flow, so as to smoothly filter the water entering the water receiving cavity 16 and avoid impurities from corroding the inside of the expansion tank. During the process of water flowing back from the water receiving cavity 16 to the heating system, under the impact of the water flow, the auxiliary soft sheet 24 covers the filter screen 23 to ensure that the filter screen 23 can open in the direction of water flow, so as to ensure rapid water return and at the same time discharge any impurities that may be present from the water receiving cavity 16.

[0028] In this embodiment, the above is merely an example and is not intended to limit the scope of protection of this application.

[0029] This utility model provides a corrosion-resistant rectangular expansion tank. The inner wall of the outer shell is coated with a corrosion-resistant coating. A rubber diaphragm is used to create a water-receiving cavity connected to an inlet pipe and an air-receiving cavity connected to an air-receiving pipe. The inner and outer surfaces of the inlet pipe are coated with a nickel-plated protective layer. A unidirectionally opening and closing filter structure is provided at the inner outlet of the inlet pipe where it is located in the water-receiving cavity. Through the cooperation of hinges and limiting members on the filter structure with a reset component and limiting groove on the inner wall of the inlet pipe, the filter structure can close when water enters the water-receiving cavity and open when water flows out of the water-receiving cavity. Additionally, the inner wall of the pipe is provided with… The expansion tank is wrapped with composite fiber strips at intervals, and an annular sealing ring is provided at the outer end of the external outlet. The corrosion-resistant coating on the inner wall of the outer shell and the nickel-plated protective layer on the inner and outer surfaces of the liquid inlet pipe in this patent solution can prevent the expansion tank and its liquid-contacting structures from being directly and for a long time in contact with the liquid, thus preventing corrosion or rust. At the same time, the one-way opening and closing filter structure can filter out impurities carried by the liquid when it enters the expansion tank, minimizing the corrosion of the expansion tank interior by impurities. Furthermore, the annular sealing ring and the composite fiber strips work together to ensure good leak-proof function at the connection, improving its overall corrosion resistance, extending the product's service life, and increasing its competitiveness.

[0030] The embodiments disclosed above are only for detailed description of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, simple improvements and changes made in accordance with the claims of the present utility model are still within the scope of protection of the present utility model.

[0031] The scope of protection of this utility model shall be determined by the defined scope. For those skilled in the art, various improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A corrosion-resistant rectangular expansion tank, comprising an outer shell, a liquid inlet pipe, and an air inlet pipe, characterized in that, The inner wall of the outer shell is coated with a corrosion-resistant coating, and a rubber diaphragm is installed inside it. The rubber diaphragm divides the interior of the outer shell into an adjustable-sized air-receiving cavity and a water-receiving cavity. The liquid inlet pipe is connected to the water-receiving cavity, and the air inlet pipe is connected to the air-receiving cavity. The inner wall and outer surface of the liquid inlet pipe are coated with a nickel-plated protective layer, including a tube penetrating the outer shell, an external outlet located outside the outer shell, and an internal outlet located in the water-receiving cavity. A filter structure that can be opened and closed in one direction is provided at the internal outlet. The filter structure includes a filter, a hinge, and a limiting member. An auxiliary soft sheet is provided on the side of the filter facing the internal outlet. One end of the auxiliary soft sheet is fixed to the position of the hinge on the filter. The hinge and the limiting member are symmetrically arranged at both ends of the filter, and the hinge is hinged to the inner wall of the tube near the internal outlet. A reset component is provided on the inner wall of the tube on the same side as the hinge, and a limiting groove is provided on the side opposite to the hinge.

2. The corrosion-resistant rectangular expansion tank according to claim 1, characterized in that, An adjustment component is also provided, which includes an adjustment groove and an adjustment block; the adjustment groove is located on the inner wall of the tube on the side of the hinge near the outer outlet, and its length is the same as the diameter of the filter screen; the adjustment block is located on the inner wall of the tube on the side of the hinge near the inner outlet.

3. The corrosion-resistant rectangular expansion tank according to claim 2, characterized in that, The reset assembly includes a reset spring, a protective membrane, and a traction spring; two sets of reset springs are provided and are respectively located at both ends of the adjustment groove; the protective membrane is connected to the inner wall of the tube outside both ends of the adjustment groove; one end of the traction spring is connected to the filter screen near the hinge, and the other end is connected to the adjustment block.

4. The corrosion-resistant rectangular expansion tank according to claim 1, characterized in that, The inner wall of the tube is provided with a connecting thread section, and a section of the connecting thread section near the outer outlet is wound with composite fiber strips at intervals.

5. A corrosion-resistant rectangular expansion tank according to claim 1, characterized in that, An annular sealing ring is provided at the outer end of the outlet.

6. A corrosion-resistant rectangular expansion tank according to claim 1, characterized in that, The outer shell includes an upper shell, a lower shell, and a fixing member. The upper shell and the lower shell are symmetrically connected and arranged, and the fixing member surrounds and wraps around the connection between the upper shell and the lower shell.

7. A corrosion-resistant rectangular expansion tank according to claim 1, characterized in that, A control valve is installed on the air intake pipe, and a cover is installed on the outside of the control valve.

8. A corrosion-resistant rectangular expansion tank according to claim 1, characterized in that, The gas-containing cavity is pre-filled with a certain amount of nitrogen.

9. A corrosion-resistant rectangular expansion tank according to claim 1, characterized in that, The outer surface of the outer casing is provided with an anti-rust coating.

10. A corrosion-resistant rectangular expansion tank according to claim 1, characterized in that, The outer surface of the outer casing is provided with a label groove.

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