Water storage tank structure and operating method for the reverse osmosis water purifying system

Abstract

A water storage tank built for a reverse osmosis water purifying system deploys multi water flow passages of purified water and drainage water, allocated a soft bladder unit receiving purified water encompassed by the waste water in the tank. When the water tank unit is fully filled with water, the water pressure activates the auto-shut-off valve or solenoid valve to stop operation of the reverse osmosis water purifying system. When the dispensing faucet is turned on, the drainage water swells to squeeze the soft bladder unit to deliver the purified water out from the soft bladder unit to the dispensing faucet, and the drainage water flushes the reverse osmosis membrane as well. The technique enables the tank to take the least water pressure resistance to hold water and drain water which results in energy saving and water saving.

Claims

1. A water tank unit (A) comprising: a tank (1) having a room (11) defined therein, multiple holes (111, 111a, 111b) defined through a top of the tank (1), the tank (1) having an open bottom (12) to which a bottom cover (13) is connected; a control valve (2) mounted atop the tank (1) and having multiple water passages, the water passages including a drainage water inlet passage (a), a drainage water outlet passage (b) and a purified water passage (c) and connected with the holes (111, 111a, 111b) in the top of the tank (1) respectively, and a soft bladder unit (3) located in the room (11) of the tank (1) and having a bladder (31) with an axial support shaft (32) connected therein, the axial support shaft (32) having a connection path (33) connected to a top thereof, the connection path (33) connected with the purified water passage (c), the control valve (2) controls drainage water to enter into and to flow out from the room (11) of the tank (1), and when the drainage water enters into the room (11), the drainage water squeezes purified water in the soft bladder unit (3) out from the tank (1).

2. The water tank unit as claimed in claim 1, wherein a pressure P2 is formed in the soft bladder unit (3) as the bladder is filled and no drainage water is received in the room (11) of the tank (1).

3. The water tank unit as claimed in claim 2, wherein a check valve (4b) is connected in a connection pipe (d) connected between the drainage water outlet passage (b) and the purified water passage (c).

4. The water tank unit as claimed in claim 3, wherein the control valve (2) has a valve body (21), a spring member (22), a plunger core (23) and a diaphragm unit (24), the spring member (22), the plunger core (23) and the diaphragm unit (24) are installed in a stepped hole (213) in the valve body (21) in sequence, the spring member (22) provides a spring force P3 to move the plunger core (23), when the water tank unit (A) generates purified water, the pressure P2 is larger than the spring force P3 so that the control valve (2) allows a flow of the drainage water out.

5. The water tank unit as claimed in claim 4, wherein the valve body (21) has a body (210) and two side covers (211, 212), the diaphragm unit (24) includes a film (241) and a stopper seat (242) to which the film (241) is connected, the two side covers (211, 212) are respectively connected to two ends of the body (210), the drainage water inlet passage (a) and the purified water passages(c) respectively extend through the two side covers (211, 212), the drainage water outlet passage (b) communicates within the interior of the body (210).

6. The water tank unit as claimed in claim 5, wherein the stepped hole (213) includes a first access (214) and a second access (215), the first access (214) communicates with the drainage water inlet passage (a), the second access (215) communicates with the drainage water outlet passage (b), the plunger core (23) has a first flow spacer (232), a second flow spacer (233) and a stopper seat (234), the plunger core (23) is located in the stepped hole (213), the first flow spacer (232) is located in the first access (214), the second flow spacer (233) is located in the second access (215), the plunger core (23) is pushed by the drainage water so that the drainage water enters into the room (11) of the tank (1) to squeeze the purified water in the soft bladder unit (3) out.

7. The water tank unit as claimed in claim 6, wherein a flow restrictor (4) is connected at a connection portion between the drainage water inlet passage (a) and the room (11) of the tank (1), another flow restrictor (4a) is connected at a connection portion between the drainage water inlet passage (a) and the first access (214).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view to show the water tank unit of the present invention:

(2) FIG. 2 is an exploded view of the water tank unit of the present invention;

(3) FIG. 3 is an exploded view of the control valve of the water tank unit of the present invention;

(4) FIG. 4 shows the parts of the reverse osmosis water purifying system of the present invention;

(5) FIG. 5 is a cross sectional view of the water tank unit wherein no water is stored therein;

(6) FIG. 6 is a cross sectional view of a portion of the water tank unit wherein no water is stored;

(7) FIG. 7 is a cross sectional view of the water tank unit of the present invention wherein purified water is produced and stored in the soft bladder unit;

(8) FIG. 8 shows that the drainage water is released from the water tank unit when purifying water;

(9) FIG. 9 shows that the water tank unit is fully filled with purified water;

(10) FIG. 10 shows that the purified water is squeezed out from the water tank unit;

(11) FIG. 10a is an enlarged section of FIG. 10;

(12) FIG. 11 shows another reverse osmosis water purifying system of the present invention;

(13) FIG. 12 shows yet another reverse osmosis water purifying system of the present invention;

(14) FIG. 13 shows the steps of the operation of water tank unit of the present invention, and

(15) FIG. 14 shows a conventional reverse osmosis water purifying system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(16) Referring to FIGS. 1 to 5, the present invention relates to a water tank unit A of a reverse osmosis water purifying system B. The waste water of the reverse osmosis water purifying system B is converted to be the power to dispense the purified water from the water tank unit A. The water tank unit A comprises a tank 1 having a chamber 11 defined therein, a soft bladder unit 3 is built in the chamber 11.

(17) Multiple passages 111, 111a, 111b are defined through the top of the tank 1. The tank 1 has an open bottom 12 to which a bottom cover 13 is connected. A recess 10 is defined on top of the tank 1 so as to receive a control valve 2 therein. The control valve 2 is fixed by a fixing member 14. A top cover 15 is mounted on top of the tank 1. A notch 16 is defined under side of the recess 10, as shown in FIG. 5, the notch 16 is to give room to the drainage water passage to flow smoothly when the soft bladder unit 3 is full.

(18) As shown in FIGS. 3 and 6, the control valve 2 has multiple water passages which include the drainage water inlet passage a, the drainage water outlet path b and the purified water inlet/outlet passage c. The 3 passages above are connected with gates 111, 111a, 111b on top of the tank 1 respectively. The control valve 2 further has a valve body 21, a spring member 22, a plunger core 23 and diaphragm unit 24. The spring member 22, the plunger core 23 and diaphragm unit 24 are installed in sequence in the division chamber 213 of the valve body 21. The spring member 22 provides a spring force P3 to push the plunger core 23. The control valve 21 has a body 210 and two side covers 211 and 212. The diaphragm unit 24 includes a film 241 and a seat 242 connected. The two side covers 211 and 212 are respectively connected to the both end of the valve body 210. The drainage water passage a and the purified water passage c respectively located on two side covers 211 and 212. The drainage water outlet passage b communicates with the interior of the body 210. The stepped hole 213 includes a first access 214 and a second access 215, wherein the first access 214 communicates with the drainage water inlet path a, and the second access 215 communicates with the drainage water outlet path b. The plunger core 23 has a first flow spacer 232, a second flow spacer 233 and a stopper seat 234. The valve plunger core 23 is located in the stepped hole 213, the first flow spacer 232 is located in the first access 214, and the second spacer 233 is located in the second path access. The plunger core 23 is located in the stepped hole 213, the first spacer 232 is located in the first access 214, and the second spacer 233 is located in the second access 215.

(19) As shown in FIGS. 2 and 5, a soft bladder unit 3 is located in the room 11 of the tank 1 and has a bladder 31 with an axial support shaft 32 connected therein. The axial support shaft 32 has a connection path 33 connected to the top thereof. The connection path 33 is connected with the purified water path c so that the purified water is dispensed from the soft bladder unit 3 via the purified water path c and the connection path 33. The bladder 31 accumulates a pressure level established by the purified water. The drainage water temporarily stored in the tank 1, encompass the bladder 31 as shown in FIG. 7.

(20) As shown in FIG. 6, a flow restrictor 4 is connected at the connection portion between the drainage water inlet path a and the room 11 of the tank 1, and another flow restrictor 4a is connected at a connection portion between the drainage water inlet path a and the first access 214. The flow restrictor 4, 4a restrict the drainage water from entering into the water tank unit A or the first access 214 by an excessive water pressure.

(21) As shown in FIGS. 4 and 7, the water tank unit A is cooperated with a filter 5, a first filter 6, a filter unit 61, an auto-shut-off valve 62, a second filter 7, a 4-way connector 73, a drainage pipe 82 and other pipes to assemble the reverse osmosis water purifying system B of the present invention. The inlet 51 of the filter 5 connected to the first filter 6, the outlet 52 of the filter 5 is connected to the purified water path c of the water tank unit A and the second filter 7 by the 4-way connector 73. The drainage water outlet 53 of the filter 5 is connected to the drainage water inlet path a of the water tank unit A.

(22) The reverse osmosis water purifying system B of the present invention uses low pressure and medium pressure to be cooperated with the feed water source with pre-set pressure, so that no booster pump is required to boost the water from the feed water source. When the water from the feed water source flows to the filter 5, the present invention processes the water and generates purified water and drainage water. The purified water and the drainage water respectively flow through the holes 111b and 111 via the purified water path c and the drainage water inlet path a of the water tank unit A. The purified water flows into the bladder 31 to form the purified water area via the connection path 33, and the drainage water encompass the bladder 31 inside the tank 1 to form the waste water area.

(23) As shown in FIG. 8, the purified water flows through the purified water path c and the pressure P2 in the purified water area push the second part 233 toward left to communicate the drainage water outlet path b and the hole 111a, so that the drainage water enters the second access 215 and the first access 214 via the hole 111a. The drainage water then flows to the drainage pipe 82 via the drainage water outlet path b. If the pressure P2 is lower than the spring force P3, the plunger core 23 move toward right to shut off the communication between the drainage water outlet path b and the hole 111a as shown in FIG. 6.

(24) As shown in FIGS. 4 and 9, when the bladder 31 is fully filled with purified water and has a pressure P2 to shut off the valve 62, as shown in FIG. 4 via the purified water path c, a diaphragm piece 621 in the auto-shut-off valve 62 stops the feed water to filter 5. This stops both producing purified water and drainage water. The water tank unit A has small amount of drainage water therein.

(25) As shown in FIGS. 4 and 9, when the dispensing faucet 72 is turned on, the purified water in the water tank unit A flows toward the second filter unit 71 and through to the faucet 72 by the force created by the amount of drainage water entering into the drainage water area in the water tank unit A and the accumulating force squeezes the bladder 31, wherein the bladder 31 has a pressure P2 stored therein, so that the purified water is squeezed out from the bladder 31 via the purified water path c. The pressure P2 then drops and activates the reverse osmosis water purifying system B to produce purified water again. The drainage water flows into the water tank unit A via the holes 111, 111a and the drainage water inlet path a. The pressure in the drainage water area is established by the entering of the drainage water so as to keep squeezing the soft bladder unit 3 to dispense the purified water until the faucet 72 is turned off. The water tank unit A then is under the status of producing purified water as shown in FIG. 8.

(26) As shown in FIG. 10a, in order to prevent the water tank unit A from exploding by high pressure due to problems of the auto-shut-off valves 62, 63, a check valve 4b is connected in the connection pipe d connected between the drainage water outlet path b and the purified water path c. That means when the pressure in the water tank unit A is too high, the pressure P2 of the purified water is able to activate the check valve 4b, and a portion of the purified water is released via the drainage water outlet path b to prevent the water tank unit A from being damaged by high pressure.

(27) As shown in FIG. 11 which shows a reverse osmosis water purifying system B1 that is connected with the water tank unit A, the difference between the reverse osmosis water purifying system B and the reverse osmosis water purifying system B1 is that the auto-shut-off valve 63 and the 3-way connector 74 used in the reverse osmosis water purifying system B1 are used for the feed water source with specific pressure without any booster pump. The reverse osmosis water purifying system B1 is able to produce purified water.

(28) As shown in FIG. 12 which shows a reverse osmosis water purifying system B2 that is connected with the water tank unit A, the difference between the reverse osmosis water purifying system B2 and the reverse osmosis water purifying system B1 is that the reverse osmosis water purifying system B2 uses a pressure switch 64 or solenoid valve and a booster pump 65. The pressure switch 64 or solenoid valve and the booster pump 65 are electrically connected to the electric-control module 81 and the power source 8. The reverse osmosis water purifying system B2 uses the booster pump 65 to deliver the water from the feed water source and generates a pre-set pressure. The water with the pre-set pressure pushes a diaphragm 631 in the auto-shut-off valve 63 and flows toward the filter 5 so as to produce purified water and drainage water. The purified water and the drainage water respectively flows into the water tank unit A via the purified water path c and the drainage water inlet path a.

(29) When the water tank unit A is fully filled with water, the pressure P2 of the purified water applies to the diaphragm 631 which blocks the path of the water pumped from the feed water source not to enter the filter 5, and a pressure of the water is accumulated. When the pressure switch 64 detects the pressure, the electric-control module 81 will shut off the electro-magnetic valve and the pump 65.

(30) When the water tank unit A dispenses water, the pressure in the auto-shut-off valve 63 drops so that the water from the water source can turn the auto-shut-off valve 63 and flows toward the filter 5. When the pressure switch 64 detects the low pressure, the electric-control module 81 activates the pump 65 to allow the water from the water source to flow to the filter 5 via the auto-shut-off valve 63 to produce purified water and drainage water. The purified water and the drainage water are stored in the water tank unit A. The circulation makes the reverse osmosis water purifying system B2 to operate properly.

(31) As shown in FIG. 13, the method for operating the water tank unit A comprising:

(32) a step (a) of installing a drainage water and purified water paths: preparing a water tank unit A which has a tank 1, a drainage water inlet path a, a drainage water outlet path b and purified water path c being defined in the tank 1;

(33) a step (b) of installing a soft bladder unit 3: installing a soft bladder unit 3 in the tank 1 for storage of purified water therein, and

(34) a step (c) of installing a control valve: installing a control valve 2 between the drainage water inlet path a and the drainage water outlet path b, the control valve 2 communicating with the purified water path c and controlling the drainage water and the purified water to be introduced into and drawn out from the water tank unit A.

(35) While we have shown and described the embodiments in accordance with the present invention, it should be clear to those skills in the art that further embodiments may be made without departing from the scope of the present invention.