Water purifier with hot tank

Abstract

The utility model discloses a water purifier with a hot tank, which comprises an RO (reverse osmosis) filter element, a rear filter element and the hot tank, after raw water is filtered by the RO filter element, the prepared purified water enters the hot tank after passing through the rear filter element, and the purified water is provided for a user through a faucet after being heated; the water purification end of the RO filter element is also provided with a backflow bypass which is controlled by a backflow electromagnetic valve, so that purified water prepared by the RO filter element flows back to the water inlet end of the RO filter element for secondary filtration; a first TDS probe is arranged in the water path before the purified water enters the hot tank and detects the TDS value of the purified water entering the hot tank, and if the TDS value is higher than a set value, the backflow electromagnetic valve is opened for secondary filtration of the RO filter element. According to the utility model, the problems of scale and peculiar smell of the hot tank can be avoided under the condition that the original waterway is slightly changed.

Description

Technical Field

[0001] The utility model belongs to water purification equipment, in particular to a water purifier with a hot tank. Background Art

[0002] Hot tank water purifiers still have a relatively large market. Their basic structure includes a filter element. The filtered clean water enters a hot tank. The hot tank has the function of heating and heat preservation, that is, there is always hot water in the hot tank so that users can use it at any time. Obviously, the disadvantage of this method is that there is water in the hot tank for a long time, and it may be heated repeatedly, which is easy to produce scale, so there are higher requirements for the water quality in the hot tank. Although the water in the hot tank itself is filtered clean water, if the raw water conditions are very poor, the clean water entering the hot tank still cannot withstand the test of repeated heating, and scale and odor may still form in the hot tank. Summary of the invention

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a water purifier with a hot tank.

[0004] The technical solution adopted by the utility model is as follows: a water purifier with a hot tank includes an RO filter element, a post-filter element and a hot tank. After raw water is filtered by the RO filter element, the obtained clean water enters the hot tank after passing through the post-filter element, and is provided to users through a faucet after being heated; the utility model is characterized in that: the clean water end of the RO filter element also has a reflux bypass, which is controlled by a reflux solenoid valve to reflux the clean water obtained by the RO filter element to the water inlet end of the RO filter element for secondary filtration; a first TDS probe is provided in the water path before entering the hot tank to detect the TDS value of the clean water entering the hot tank. If the TDS value is higher than the set value, the reflux solenoid valve is opened to perform secondary filtration of the RO filter element.

[0005] Furthermore, it also includes a water path that is directly connected from the post-filter to the faucet without passing through the hot tank.

[0006] A second TDS probe is also provided on the water path before entering the RO filter element, and the reflux bypass is connected between the second TDS probe and the water inlet end of the RO filter element.

[0007] The desalination rate of the RO filter element is basically a constant value, for example, 85%, and after secondary filtration, the theoretical desalination rate can reach 97.75%. It is enough to meet the requirements of the hot tank. The reflux bypass of the secondary filtration is controlled by the first TDS probe before entering the hot tank, that is, only when the purified water needs to enter the hot tank, its TDS value will be analyzed to determine whether secondary filtration is needed. This method is more targeted and will not waste the service life of the RO filter element. The first and second TDS probes are respectively arranged before and after the RO filter element, and the changes in the values ​​before and after can be compared to calculate the life of the RO filter element. Therefore, the utility model will return the purified water after the initial filtration to the second TDS probe, which will not affect the correct evaluation of the RO filter element.

[0008] It can be seen that the utility model can avoid the problems of scale and odor of the hot tank under the condition of little change to the original water circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the waterway of the utility model.

[0010] The accompanying drawings are marked as follows: 1-raw water inlet end; 2-pre-filter element; 3-second TDS probe; 4-boosting pump; 5-first solenoid valve; 6-second solenoid valve; 7-RO filter element; 8-third solenoid valve; 9-post-filter element; 10-fourth solenoid valve; 11-first TDS probe; 12-fifth solenoid valve; 13-sixth solenoid valve; 14-hot tank; 15-water pump; 16-intake valve; 17-seventh solenoid valve; 18-faucet. DETAILED DESCRIPTION

[0011] See the attached drawings. In this embodiment, there are multiple solenoid valves, which have different functions; among them, the first solenoid valve 5 and the second solenoid valve 6 are parallel selectivity. When the first solenoid valve 5 is opened and the second solenoid valve 6 is closed, the raw water does not pass through the RO filter element, but flows out through the faucet 18 after simple filtration by the pre-filter element 2, which is generally used in scenes with low water quality requirements. When the first solenoid valve 5 is closed and the second solenoid valve 6 is opened, the water outlet of the pre-filter element enters the RO filter element 7 for filtration. The third solenoid valve 8 is a reflux solenoid valve, which is used to control the on and off of the water outlet reflux bypass of the RO filter element; the fourth solenoid valve 10 is a waste water solenoid valve of the RO filter element; the fifth solenoid valve 12 and the sixth solenoid valve 13 are parallel selectivity. When the fifth solenoid valve 12 is opened and the sixth solenoid valve 13 is closed, the water outlet of the post-filter element 9 does not pass through the hot tank 14 but is directly connected to the faucet 18 and then the water is discharged; when the fifth solenoid valve 12 is closed and the sixth solenoid valve 13 is opened, the water outlet of the post-filter element 9 enters the hot tank 14. The air inlet valve 16 is a one-way valve to balance the air pressure inside and outside the hot tank so that water can be discharged smoothly; the seventh solenoid valve 17 and the water pump 15 are opened at the same time to allow the hot water in the hot tank to be discharged through the faucet 18.

[0012] In the case where the hot tank is not used, the present invention is no different from the prior art.

[0013] When a hot tank is required, the first TDS probe 11 detects the water quality. If the TDS value is higher than the set value, the reflux solenoid valve 8 is opened to allow the water outlet of the RO filter element 7 to flow back between the second TDS probe 3 and the booster pump 4, and then enter the RO filter element for filtration again after being pressurized, thereby obtaining purified water with a lower TDS value after secondary filtration.

Claims

1. A water purifier with a hot tank, comprising an RO filter element, a post-filter element and a hot tank. After the raw water is filtered by the RO filter element, the purified water passes through the post-filter element and enters the hot tank, and is heated and provided to the user through the tap; the characteristics are: The purified water end of the RO filter element also has a reflux bypass, which is controlled by a reflux solenoid valve to reflux the purified water produced by the RO filter element to the water inlet end of the RO filter element for secondary filtration; a first TDS probe is provided in the water path before entering the hot tank to detect the TDS value of the purified water entering the hot tank. If it is higher than the set value, the reflux solenoid valve is opened to perform secondary filtration of the RO filter element.

2. The water purifier with a hot tank as claimed in claim 1, characterized in that: It also includes a water line that connects directly from the post-filter to the faucet without passing through the hot tank.

3. The water purifier with a hot tank according to claim 1 or 2, characterized in that: A second TDS probe is also provided on the water path before entering the RO filter element, and the reflux bypass is connected between the second TDS probe and the water inlet end of the RO filter element.

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