Method for solving expansion problem of hot water tank of straight drink machine and straight drink machine

Abstract

The invention provides a method for solving an expansion problem of a hot water tank of a straight drink machine, and the straight drink machine. The straight drink machine comprises a film processor, a pressurized water storage tank, a hot tank, a drain vale and a hot tank water inlet valve, wherein a water inlet of the film processor communicates with a water source, a purified water outlet of the same communicates with a water purification cavity of the pressurized water storage tank and an inlet of the hot tank water inlet valve, and a concentrated water outlet of the same communicates with a concentrated cavity of the pressurized water storage tank and an inlet of the drain valve, an outlet of the hot tank water inlet valve communicates with a water inlet of the hot tank, and the hot tank is provided with a water outlet; after the hot tank stops draining each time, a water level in the hot tank is reduced to be not higher than an upper control water level of the hot tank by reducing the amount of water in the concentrated water cavity in the pressurized water storage tank; and a set distance is formed between the upper control water level and the inner surface of the top of the hot tank. Compared with the prior art, the method utilizes the hot tank water inlet valve to replace a hot tank water outlet valve function of controlling water in and out of the hot tank, and thus the problem that the water outlet of the hot tank drips and leaks water due to unreliable sealing of the hot tank water outlet valve is thoroughly avoided.

Description

technical field [0001] The invention relates to the field of water purification equipment, in particular to a method for solving the problem of water expansion in a hot tank of a direct drinking machine and a direct drinking machine. Background technique [0002] A direct drinking machine generally includes a water purification unit, a water storage unit, a heating unit and a water outlet unit, wherein the heating unit mainly includes a hot tank, a heating element, a temperature control subunit, an expansion tank and / or a normal temperature and pressure water storage tank. When the water in the hot tank rises from low temperature to high temperature, the volume expansion will be accompanied by the effect of thermal expansion and contraction. There may also be some air bubbles in the water or on the tank wall. The volume expansion of the air bubbles is greater after heating. During the heating process, especially When it is close to the boiling point, it will also vaporize to...

AI Technical Summary

Problems solved by technology

[0004] 1. The expansion tank takes up space, making the machine larger, increasing the transportation cost, and increasing the requirements for the installation site;

[0005] 2. Increase the cost of manufacturing originals, the expansion tank itself and its matching connecting pipes and breathing ports, as well as the increased cost of the machine shell to accommodate the expansion tank;

[0006] 3. The temperature of the expansion tank and the supporting exhaust pipe is high during operation, and it will continuously dissipate heat to the environment, which increases the energy consumption of the machine during operation

[0008] 1. As a result, the temperature of the water in the normal temperature and pressure water storage tank will rise, which may usually rise to about 32°C to 35°C. This temperature range is very suitable for bacteria to multiply, so it is a common phenomenon that bacteria in normal temperature water of direct drinking machines using this design scheme exceed the standard.

[0009] 2. "Changing temperature" also causes energy waste

[0011] Another problem is that before heating, the inside of the hot tank and the exhaust pipe are partially filled with water below the water level of the normal temperature and pressure water storage tank. The gas in the form of tiny bubbles expands, and the small bubbles will merge with other expanded bubbles to become large bubbles in the process of moving upward after expansion. After entering the exhaust pipe, the large bubbles will continue to move upward under the action of their buoyancy. Push the water above the bubbles to the expansion tank or to the normal temperature and pressure water storage tank. This part of the water that is moved upward by the bubbles and pushed out of the hot tank is not the water produced by thermal expansion.

The part of water lost by the hot tank will be automatically replenished from the normal temperature water storage tank through the hot tank water inlet pipe. However, the temperature of this part of water may be very high, and the heat carried is not only wasted, but also aggravated the phenomenon of "temperature shifting"

The reason is that the air bubbles in the hot tank with this design structure can only be discharged through the exhaust pipe, and the exhaust pipe is already filled with water. Because the diameter of the exhaust pipe is generally small, the air bubbles cannot move upward through the water in the exhaust pipe. , can only push the water in the exhaust pipe to move upwards, so that during the heating process, what the exhaust pipe sprays to the expansion tank or the normal temperature and pressure water storage tank is a mixture of steam and water or a mixture of gas and water

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