TWI869693B - Expansion tank - Google Patents

Abstract

The present invention discloses an expansion tank comprises an upper barrel, a plastic lining and a leak-proof padding located in the upper barrel. The plastic lining has a first groove facing the upper barrel and a top surface located around the first groove. The first groove is covered by the upper barrel, the top surface abuts on the upper barrel, and the leak-proof padding is stuffed in the first groove of the plastic lining.

Description

Pressure water storage tank

The present invention relates to the structure of a pressure water storage barrel.

Pressure water storage barrels are commonly used in water supply pipeline systems to balance water pressure. In addition, pressure water storage barrels are often connected to reverse osmosis water purifiers to store pure water produced by reverse osmosis water purifiers. The detailed structure of such pressure water storage barrels can be found in patents such as US6,915,922, US6,517,177, US5,386,925, US9,255,663 and GB1209731. FIG. 7 shows a conventional pressure water storage barrel 9, which is basically composed of a metal barrel 91 and a plastic liner 92, a rubber elastic diaphragm 93 and a metal pressure ring 94 disposed in the metal barrel 91. The metal barrel 91 is generally composed of an upper cylinder 911 and a lower cylinder 912. The shapes of the plastic liner 92 and the rubber elastic diaphragm 93 roughly correspond to the upper cylinder 911, and are clamped together between the upper cylinder 911 and the metal pressure ring 94. A water storage space 901 with a variable volume can be formed between the plastic liner 92 and the rubber elastic diaphragm 93, and a gas storage space 902 with a variable volume can be formed between the rubber elastic diaphragm 93 and the lower cylinder 912.

The top of the upper cylinder 911 has a water inlet and outlet joint 95, which is connected to the above-mentioned water supply pipeline or reverse osmosis water purifier (not shown in the figure), so that the water in the water supply pipeline or reverse osmosis water purifier can enter and exit the water storage space 901 through the water inlet and outlet joint 95. The bottom of the lower cylinder 912 has an inflation check valve 96, which is used to replenish the air in the air storage space 902. As shown in FIG. 7 , when the water pressure of the water supply pipeline or the reverse osmosis water purifier is greater than the pressure in the air storage space 902, the water in the water supply pipeline or the reverse osmosis water purifier will flow into the water storage space 901 through the water inlet and outlet joints 95 for temporary storage, and the rubber elastic diaphragm 93 will compress the air storage space, causing the pressure in the air storage space 902 to increase. In addition, when the water pressure of the water supply pipeline or the reverse osmosis water purifier is lower than the pressure in the air storage space 902, the water temporarily stored in the water storage space 901 will be pushed out of the water inlet and outlet joint 95 by the rubber elastic diaphragm 93, so that the pressure in the air storage space 902 becomes lower.

As shown in FIG. 7 and FIG. 8 , a rubber anti-leakage pad 951 is usually arranged between the upper cylinder 911 of the pressure water storage barrel 9 and the plastic inner liner 92. The water inlet and outlet joints 95 of the pressure water storage barrel 9 will pass through a perforation 951a formed in the center of the anti-leakage pad 951. The anti-leakage pad 951 has a certain thickness and diameter, which inevitably generates a gap 950 between the top surface of the plastic inner liner 92 and the upper cylinder 911. The larger the capacity of the pressure water storage barrel 9, the larger the diameter of its water inlet and outlet joints 95, and the thickness and diameter of its anti-leakage pad 951 also increase accordingly, and the aforementioned gap 950 will of course also increase. This gap 950 allows the plastic liner 92 to have a chance to move toward the upper cylinder 911. For example, whenever the rubber elastic diaphragm 93 in the pressure water storage barrel 9 pushes water out of the water inlet and outlet joint 95, the plastic liner 92 will be pushed upward by the upward pressure caused by the water flowing outward. Although the plastic liner 92 is usually pressed by the metal pressure ring 94, after the plastic liner 92 is pushed upward many times, it is very likely that the pressing effect of the metal pressure ring 94 will deteriorate, so that the plastic liner 92 starts to move toward the upper cylinder 911. Once this happens, it means that The upper cylinder 911 and the metal pressure ring 94 no longer tightly clamp the plastic liner 93 and the rubber elastic diaphragm 92 therebetween. At this time, air and/or water leakage will occur between the upper cylinder 911 and the metal pressure ring 94, eventually causing the pressure water storage barrel 9 to lose its existing function and die.

The present invention provides a pressure water storage barrel, which includes a metal barrel, the metal barrel includes an upper barrel body and a lower barrel body, the upper barrel body has a first through hole. The pressure water storage barrel also includes a pipe joint fixed on the upper barrel body, a plastic inner liner located in the upper barrel body, an elastic diaphragm located in the plastic inner liner, a metal pressure ring located in the elastic diaphragm, and a leak-proof pad. The pipe joint includes an outer pipe section and an inner pipe section, the outer pipe section is located outside the upper barrel body, and the inner pipe section passes through the first through hole of the upper barrel body. The plastic inner liner has a second through hole, the second through hole is opposite to the first through hole of the upper barrel body and is passed through by the inner pipe section of the pipe joint. In addition, the plastic liner also has a first groove facing the upper barrel body and communicating with the second through hole and a top surface located around the first groove, the first groove is covered by the upper barrel body, and the top surface is close to the upper barrel body. The leak-proof pad is filled in the first groove of the plastic liner and has a third through hole. The third through hole is opposite to the first through hole of the upper barrel body and is passed through by the inner pipe section of the pipe joint. The elastic diaphragm and a water storage space with a variable volume are formed between the elastic diaphragm and the plastic liner, and a gas storage space with a variable volume is formed between the elastic diaphragm and the lower barrel body. The metal pressure ring tightly presses the elastic diaphragm and the plastic liner onto the upper barrel.

The pressure water storage barrel of the present invention accommodates the leak-proof pad by means of the first groove of the plastic liner, so that the top surface of the plastic liner can be against the upper barrel body, eliminating the gap formed by the leak-proof pad between the plastic liner and the upper barrel body in the past, thereby solving the above-mentioned air leakage and/or water leakage problems of the conventional pressure water storage barrel.

100:Metal barrel

1: Upper barrel

10: Bottom

11: Water inlet and outlet joints

110: First perforation

111: Outer pipe section

112: Inner pipe section

112a: Final paragraph

12: Leak-proof ring

13: Gasket

2: Lower barrel

20: Top

201: Bottom

21: Inflatable check valve

3: Plastic lining

31: First groove

32: Top

33: Second perforation

35: First bump

36: Second bump

37: Second groove

4: Elastic diaphragm

41: Water storage space

42: Gas storage space

5:Metal pressure ring

6: Leak-proof pad

61: Third canal perforation

Learning

9: Pressure water storage barrel

901: Water storage space

902: Gas storage space

91:Metal barrel

911: Upper cylinder

912: Lower cylinder

92: Plastic lining

93: Rubber elastic diaphragm

94:Metal pressure ring

95: Water inlet and outlet joints

950: Gap

951: Rubber anti-leakage pad

951a: Perforation

96: Inflatable check valve

Figure 1 shows a three-dimensional exploded view of a preferred embodiment of the pressure water storage barrel of the present invention.

Figures 2 and 3 show partial cross-sectional views of the plastic liner 3 of the preferred embodiment of the present invention.

Figure 4 shows a partial cross-sectional view of the preferred embodiment of the present invention.

Figure 5 shows a partial cross-sectional view of the preferred embodiment of the present invention near the inlet and outlet water joints 11.

Figure 6 shows a partial cross-sectional view of the preferred embodiment of the present invention near the metal pressure ring 5.

Figure 7 shows a cross-sectional view of a conventional pressure water storage bucket.

FIG8 shows a partial cross-sectional view of the conventional pressure water storage barrel.

FIG. 1 and FIG. 4 show a preferred embodiment of the pressure water storage barrel of the present invention, which includes a metal barrel 100, a water inlet and outlet joint 11 disposed on the metal barrel 100, a plastic liner 3 disposed in the metal barrel 100, a leak-proof pad 6 disposed between the metal barrel 100 and the plastic liner 3, an elastic diaphragm 4 disposed in the plastic liner 3, and a metal pressure ring 5 for pressing the elastic diaphragm 4 and the plastic liner 3 together on the metal barrel 100.

The metal barrel 100 includes an upper barrel body 1 and a lower barrel body 2. A bottom 10 of the upper barrel body 1 and a top 20 of the lower barrel body 2 are joined together so that the metal barrel 100 has a hollow interior. The upper barrel body 1 and the lower barrel body 2 are preferably made of sheet iron, and the two are joined together by welding, but not limited to this. Among them, the upper barrel body 1 has a first through hole 110, an inner pipe section 112 of the inlet and outlet water joint 11 passes through the first through hole 110 of the upper barrel body 1, and an outer pipe section 111 of the pipe joint 11 is located outside the upper barrel body 1. Preferably, the outer pipe section 111 is welded to the upper barrel body 1. A bottom 201 of the lower barrel 2 is provided with an inflation check valve 21, and an air pump with a pressure gauge can be used to connect the inflation check valve 21 to inject gas into the lower barrel 2.

The plastic inner liner 3 has a second through hole 33, which is opposite to the first through hole 110 of the upper barrel body 1 and is penetrated by the inner tube section 112 of the water inlet and outlet joint 11. In addition, as shown in Figures 2 and 3, the plastic inner liner 3 also has a first groove 31 facing the upper barrel body 1 and communicating with the second through hole 33, and a top surface 32 located around the first groove 31. In addition, the leak-proof pad 6 has a third through hole 61, which is opposite to the first through hole 110 of the upper barrel body 1 and is penetrated by the inner tube section 112 of the water inlet and outlet joint 11.

As shown in FIG. 5 , the first groove 31 of the plastic inner liner 3 is covered by the upper barrel body 1, and the top surface 32 of the plastic inner liner 3 is in contact with the upper barrel body 1. The leak-proof pad 6 is filled and filled in the first groove 31 of the plastic inner liner 3. In this embodiment, the leak-proof pad 6 is made of elastic rubber or silicone, and its thickness is slightly greater than the depth of the first groove 31; On the other hand, when the end section 112a of the inner pipe section 112 of the inlet and outlet water joint 11 is subjected to a riveting operation, the leak-proof pad 6 is completely retracted into the first groove 31 due to pressure, and thus fills the first groove 31.

As shown in FIG. 1 and FIG. 4 , the elastic diaphragm 4 is located in the plastic liner 3 , and a water storage space 41 with a variable volume is formed between the elastic diaphragm 4 and the plastic liner 3 , and a gas storage space 42 with a variable volume is formed between the elastic diaphragm 4 and the lower barrel 2 .

As shown in FIG6 , the metal pressure ring 5 is located in the elastic diaphragm 4 and tightly presses the elastic diaphragm 4 together with the plastic liner 3 onto the upper barrel 1 so that the water storage space 41 and the air storage space 42 are not connected to each other.

As shown in FIG. 4 and FIG. 5 , the plastic inner liner 3 has a first protrusion 35 that is opposite to the first groove 31 and the top surface 32 and protrudes downward. The first protrusion 35 surrounds the second through hole 33 of the plastic inner liner 3 , and the outer diameter R1 of the first protrusion 35 is greater than the inner diameter R2 of the first groove 31 .

In this embodiment, as shown in FIG. 1 and FIG. 5 , the pressure water storage barrel of the present invention further includes a leak-proof ring 12 and a gasket 13 . The plastic inner liner 3 has a second protrusion 36 protruding downward from the first protrusion 35. The second protrusion 36 surrounds the second through hole 33 of the plastic inner liner 3 and has a second groove 37 opposite to the first groove 31. The second groove 37 is communicated with the second through hole 33 of the plastic inner liner 3. The leak-proof ring 12 is filled in the second groove 37. The gasket 13 covers the second groove 37 and the second protrusion 36. After the end section 112a of the inner tube section 112 passes through the leak-proof ring 12 and the gasket 13 and the above-mentioned riveting operation is performed, the end section 112a is folded back and presses the gasket 13 onto the second protrusion 36. The outer diameter R3 of the second protrusion 36 is smaller than the outer diameter R1 of the first protrusion 35, but larger than the inner diameter R2 of the first groove 31. In addition, the inner diameter R4 of the second groove 37 of the second protrusion 36 of the plastic liner 3 is smaller than the inner diameter R1 of the first groove 31.

The pressure water storage barrel of the present invention accommodates the leak-proof pad 6 by the first groove 31 of the plastic inner liner 3, so that the top surface 32 of the plastic inner liner 3 can be against the upper barrel body 1, eliminating the gap formed by the leak-proof pad 6 between the plastic inner liner 3 and the upper barrel body 1 in the past (i.e., the gap 950 shown in FIG. 8), so that the above-mentioned air leakage and/or water leakage problems of the conventional pressure water storage barrel can be solved. In addition, the plastic inner liner 3 further has the first protrusion 35 and the second protrusion 36, so that an inner wall surface of the plastic inner liner 3 presents multiple levels, ensuring that the structure of the pressure water storage barrel at this point is not easily damaged.

100:Metal barrel

1: Upper barrel

2: Lower barrel

3: Plastic lining

4: Elastic diaphragm

41: Water storage space

42: Gas storage space

5:Metal pressure ring

Claims (2)

A pressure water storage barrel comprises: a metal barrel, comprising an upper barrel body and a lower barrel body, the upper barrel body having a first through hole; a pipe joint, fixed to the upper barrel body and comprising an outer pipe section and an inner pipe section, the outer pipe section being located outside the upper barrel body, the inner pipe section passing through the first through hole of the upper barrel body; a plastic inner liner, located inside the upper barrel body and having a second through hole, the second through hole being opposite to the first through hole of the upper barrel body and being passed through by the inner pipe section of the pipe joint, wherein the plastic inner liner further comprises a first groove facing the upper barrel body and communicating with the second through hole, and a top groove located around the first groove. The first groove is covered by the upper barrel body, and the top surface is close to the upper barrel body; a leak-proof pad is filled in the first groove of the plastic liner and has a third through hole, the third through hole is opposite to the first through hole of the upper barrel body, and is penetrated by the inner tube section of the pipe joint; an elastic diaphragm is located in the plastic liner. The elastic diaphragm is in the plastic liner, and a water storage space with a variable volume is formed between the elastic diaphragm and the plastic liner, and a gas storage space with a variable volume is formed between the elastic diaphragm and the lower barrel body; and a metal pressure ring is located in the elastic diaphragm, and tightly presses the elastic diaphragm and the plastic liner together on the upper barrel body. A pressure water storage barrel as described in claim 1, wherein the leak-proof gasket is made of elastic rubber or silicone, and its thickness is slightly greater than the depth of the first groove, and it is completely retracted into the first groove due to pressure, thereby filling the first groove.