JPH054589B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a pressure type water cooler, a so-called water cooler. [Prior Art] As shown in FIG. 6, a conventional generally known pressure water cooler has a water supply pipe 11.
The water entering the cooling tank 12 is stored while being cooled by a pipe coming from the cooling device 15.
Cold water is spouted from the discharge port 13 and is drunk. The inside of the cooling tank has a flat bottom, and the water in the cooling tank can be discharged from a pipe coming out from the center of the tank through a drain outlet 14. By the way, in order to improve the cooling efficiency of conventional pressure-type water chillers, the tip of the water inlet pipe that faces the cold water tank (cooling tank) is turned diagonally downward, so that the tank corresponding to the cooling surface is A water cooler was developed in the 1970s, which was constructed so that it faced the inner wall of the tank, and the discharged water came into direct contact with the inner wall of the tank and flowed down in a spiral pattern.
This is disclosed as a device in Japanese Patent No. 37337. In other words, since the inner wall of the tank forms a cooling surface, the discharged water comes into direct contact with the cooling surface and flows down in a spiral pattern, resulting in effective heat exchange. receives sufficient cooling action,
The so-called cooling efficiency can be improved. [Problem to be solved by the invention] Since the conventional pressure-type water cooler has the above-mentioned structure, the tap water that enters the cooling tank (cold water tank) from the water supply pipe will remain in the cooling tank as the residence time increases. Chlorine decreases and bacterial contamination progresses. It is also increasingly contaminated by sedimentation and accumulation of iron and insoluble organic matter. According to experiments conducted by the present inventor, when a pressure-type water cooler was initially found to have a general bacteria count of 10 bacteria/ml, when around 20 tanks of water were passed through it every day, as the amount of water flowing through it increased, the general bacteria count increased. Although there was a tendency for the number to increase, the increase remained at 40 cells/ml. However, when I left the cold water in the cooling tank without using it for 3 days, the water turned 110.
The number increased to 10 cells/ml, and decreased to less than 10 cells/ml when water flow was resumed. Next, when the bottle was not used for 5 days and cold water was allowed to stagnate therein, the number of general bacteria increased to 10 ³ /ml, and when the water flow was resumed, the number of bacteria decreased. But after that 3~
After 5 days of retention, an increase in bacteria was observed each time. In addition, we conducted other experiments to investigate the rate of contamination when water remained in the cooling tank of a pressure-type water cooler.
After 24 hours, the number of general bacteria decreased from 5 to 3.
130 pieces/ml on the 10th day, 310 pieces/ml on the 10th day,
On the 16th day, the residual chlorine was 0 and the number of general bacteria was 25x.
10 It became ² pieces/ml. and after 20 days 16×10 ²
However, when 20% of tap water was passed through the cooling tank while draining the accumulated water, the residual chlorine became 0.3 ppm and the general bacterial count decreased to 3 bacteria/ml. Iron and insoluble organic matter amount to 0.22mg/20 days later, but they tend to increase even when tap water is passed through the water. This is because the iron and insoluble organic matter that had settled and accumulated at the bottom of the cooling tank are agitated by the running tap water, and the drain outlet is not connected to the lowest point in the center of the bottom. Well, it must be because there was a structural defect that caused the remaining amount to stagnate at the bottom. By the way, in the conventional technique disclosed in the above-mentioned Japanese Utility Model Publication No. 52-37337, the water discharged into the tank from the only water inlet pipe flows in a spiral along the wall surface of the tank, thereby improving the cooling effect. , it is stated that the adhesion of impurities contained in moisture is eliminated, and furthermore, the impurities adhering to the inner wall can be easily removed. The tendency of impurities to adhere to the lower part of the cold water tank, where all of the water always comes into contact with the wall surface and the speed of flow down the wall surface is slow, will only increase and cannot be reduced. In addition, the arrangement of the water inlet pipe on the wall is simply that only one piece is installed diagonally downward against the inner wall of the tank, and there is no special throttle structure at the opening end of the water inlet pipe, so the water pressure is reduced. Depending on the size of the water column, it may come into contact with the wall surface with a water column-like discharge action, but there is no nozzle effect, and impurities on the inner surface of the wall are slightly removed only from the localized areas of the wall surface that it directly hits. It is recognized that this is no more than the extent to which this is done. In addition, although the bottom of the cooling tank in this technology is shaped like a bowl that is curved downward, the drain outlet is located away from the center rather than at the lowest point in the center, so complete drainage of the cold water tank is impossible. It's impossible. Furthermore, there is no conventional pressure water cooler that has both a water supply mechanism and a cleaning mechanism, and even if it has a cleaning function, it is considered as an incidental effect of the water supply mechanism as described above. However, it was insufficient and incomplete for this type of pressure-type water chiller, where perfect hygiene management is said to be of the utmost importance. This invention was made by focusing on the above points, and includes a water supply pipe that can constantly supply water with a separate cleaning means for cleaning the inner wall of the cooling tank, and a drain connected to the lowest center of the hemispherical bottom. To provide a pressure type water chiller equipped with an occasional cleaning type cooling tank which is provided with a drainage means to perform complete cleaning and to constantly perform complete sanitary management. [Means for Solving the Problems] In other words, the present invention provides a drainage means having a hemispherical bottom portion of a cooling tank and communicating with a drain outlet from the lowest center thereof, a water supply means having an end opened at the top of the cooling tank, and this invention. A washing means comprising a plurality of water supply pipes for washing water and a spout nozzle branching from the middle of the water supply means and directed toward the cooling tank, and
The cleaning means penetrates the cylindrical inner wall of the cooling tank by distributing cleaning water supply pipes at equal intervals, and furthermore, the cleaning water supply pipes have two or more flat and slender fan-shaped ends at the ends of the cleaning water supply pipes. A jet nozzle is partitioned by a joint, and the jet nozzle is bent and opened toward the inner wall of the tank, and the cleaning water discharged from the nozzle is sprayed onto the inner wall of the tank with a fan-shaped thin layer spreading. Pressure-type cold water equipped with an occasional cleaning type cooling tank, characterized in that the inner wall of the tank can be washed by rotating it in a spiral shape, and a water stop valve is provided for each of the drainage means, water supply means, and cleaning means. Accordingly, the above objective can be achieved. [Operation] When supplying water into the tank, close the water stop valves of the drainage means and cleaning means, open the water stop valve of the water supply means, and fill the tank with the desired amount of water. The filled water is cooled to a set temperature by a known cooling mechanism provided around the outer circumference of the tank. To drain the water in the tank and purify the tank inner wall, close the water stop valve of the water supply means and open the water stop valves of the discharge means and purification means, and the cooling water in the tank will be drained from the drain outlet. At the same time, the adhering matter adhering to the tank inner wall is peeled off by the discharged water sprayed onto the tank inner wall from the plurality of jet nozzles. In other words, since the ejection nozzle is formed into a flat and elongated shape divided into two or more sections, the ejected water acts on the inner wall of the tank with a fan-shaped, thin layer of spreading surface, and it may be possible to form a knife edge. Because it works in a similar manner, the deposits appear in a peeling state and can be removed very easily. Furthermore, the removal of the deposits is carried out by the jet nozzle at multiple locations on the wall surface, not just one, so the deposits are removed over the entire wall surface, and the drainage means is located at the center of the hemispherical bottom. Since it is located at the lowest level, drainage is complete and there is no residual liquid, ensuring complete purification. By closing the water stop valves of the purification means and drainage means and opening the water stop valve of the water supply means, water can be supplied into the tank in the same manner as described above. [Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5 of the drawings. In the drawings, FIG. 1 is a longitudinal sectional view of the cooling tank of the pressure type water cooler of the present invention, and 1 indicates the cooling tank. 3 is a discharge pipe which spouts drinking cold water.
2 is a water supply pipe corresponding to a water supply means, and the end thereof is connected to a water tap. 8 is a drain outlet of the cooling tank 1. In this embodiment, a water supply pipe 5 for cleaning water, which corresponds to a cleaning means, branches in the middle of the water supply pipe 2, and its tip enters the cooling tank 1 and becomes a jet nozzle 4. The bottom part 10 of the cooling tank 1 is hemispherical, and the lowest position in the center thereof is connected to the drain outlet of the cooling tank 1 to form a drainage means. The water supply pipe 5 for washing water has a water stop valve 7 with a check valve for the water supply pipe, and the water supply pipe 2 has a water stop valve 6 with a check valve for the water supply pipe near the top of the branch point with the water supply for washing water. will be established.
Reference numeral 9 denotes a water stop valve with a check valve for a cooling tank drain drain pipe provided near the cooling tank 1. These valves can be easily automated using existing solenoid valves. FIG. 2 shows the cleaning means, and is a plan view showing a cleaning water supply pipe and a jet nozzle 4 whose tip opens into the cooling tank 1. The number of ejection nozzles 4 is plural, preferably four, and the case of four is shown in FIG. The mounting positions must be equidistant, but they do not necessarily need to be installed on the same plane. The shape of the jet nozzle 4 is such that when viewed from the top, the cooling tank 1 is oriented at a certain angle as shown in FIG.
The tip is curved so that the cleaning water hits the inner wall. The angle, α in FIG. 3, is in the range of 15° to 45°, but it is changed depending on the capacity of the cooling tank 1, that is, the size of the diameter. Moreover, this injection nozzle 4 is
If you look at the tip from the front, as shown in Figure 4, it has a thin, flat, vertically long tip.For example, in this figure, it is joined and partitioned at four places, so in the cross-sectional view of Figure 5, there are five parts. creating layers. The action will be explained based on the above structure. First, manually or automatically (for example, a solenoid valve), close the water stop valve 6 with a check valve for the water supply pipe 2, open the water stop valve with a check valve 9 for the cooling tank drain drain pipe, and then After draining the water, open the water stop valve 9 with a check valve for the cooling tank drain drain pipe, and keep the water stop valve 6 closed and wash water pipe 5.
When the water stop valve 7 with check valve is opened, the pressure of tap water supplied from the water pipe causes the plurality of injection nozzles 4
The tap water gushes out all at once and collides with the inner surface of the wall of the cooling tank 1, so that impurities adhering to the wall surface can be powerfully removed and washed with the tap water containing residual chlorine. In particular, since each jet nozzle 4 has a flat and elongated shape and is partitioned by joining at two or more points, the jetted water spreads out in a fan-shaped thin layer and collides with the inner surface of the wall. It acts like a kind of knife edge and can easily remove impurities attached to the wall surface. Since the ejected water has a nozzle effect, it has a strong force and exerts a peeling action over a wide range of wall inner surfaces, allowing impurities to be efficiently removed. After such cleaning, the tap water flows out from the drain outlet 8 through the open water stop valve 9 while washing away iron and insoluble organic matter that have settled in the center of the hemispherical bottom part. In this way, the inside of the cooling tank 1 is completely cleaned. Note that if an existing timer is used to operate each of the water stop valves described above, the cooling tank can be automatically cleaned at regular intervals. By the way, when the water stop valve 6 is closed and the water stop valve 7 is opened,
The water pressure of the water supply pipe 5 for cleaning water is normally 1 Kgf/ ^m2 , so the angle of the jet nozzle 4, that is, α in Fig. 3, is set to 15° to 45°, and the number of jet nozzles is four. In this case, the tap water collides with the inner wall of the cooling tank 1 with 5 to 10 times the water pressure, resulting in powerful cleaning. If this operation is performed once a month and the amount of water ejected at one time is 5 to 10 times, that is, the same amount or twice the capacity of the cooling tank, the inside of the cooling tank will always be kept clean. It will be done. After completely cleaning the inside of the cooling tank 1, close the water stop valve 9 for the drain pipe, close the water stop valve 7 for the washing water pipe, and open the water stop valve 6 for the water supply pipe, and the water supply pipe 2 will be cleaned. After filling the cooling tank 1 with fresh tap water and cooling it, it can be used sanitarily as drinking water. Next, the cleaning of the cooling tank 1 and the state of recovery of water quality in this example are shown in the table.

【table】

〔Effect of the invention〕

According to this invention, since the cooling tank is equipped with a cleaning means that can be freely switched by a water stop valve to the water supply means, the water supply operation and the cleaning operation can be alternately switched as necessary. In addition, the cleaning means penetrates the inner wall of the tank and is bent so that the jet nozzle faces the inner wall of the tank, and the jet nozzle has a flat and elongated shape and is partitioned into two or more joints. The water pressure increases significantly and acts on the inner surface of the wall in a fan-shaped thin layer that acts like a kind of knife edge, allowing impurities adhering to the wall surface to be easily peeled off and removed. In addition, the jet nozzles are arranged so that water can be sprayed over the entire wall surface by placing multiple jets at intervals depending on the diameter of the cooling tank, so the inner surface of the tank can be constantly purified. Since the water can be completely drained from the central lowest part of the hemispherical bottom via the drainage means, the cooling tank can always be kept sanitary and cooling water can be supplied in a clean state. According to this invention, the functions of the water supply means and the cleaning means can be easily performed by switching the water stop valve, and the cleaning means is provided separately to improve the cleaning function, so that cleaning and purification can be easily performed. This ensures thorough hygiene management. The pressure-type water cooler of the present invention has the features that are clear in the above table by adopting cleaning of the cooling tank by jetting tap water, which is unprecedented in conventional pressure-type water coolers, and improving the structure of the cooling tank. As such, it effectively reduces the number of bacteria and removes iron and insoluble organic matter, so it has the extremely remarkable effect of completely preventing water pollution as seen in conventional pressure-type water coolers.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a cooling tank of a pressure type water cooler which is the main part of this invention, FIG. 2 is a plan view showing the relationship between the cooling tank corresponding to the cleaning means and the jet nozzle, and FIGS. The figure is an enlarged cross-sectional view showing the structure of a jet nozzle, and FIG. 6 is a vertical cross-sectional view showing a conventional pressure-type water chiller. 1...Cooling tank, 2...Water supply pipe, 3...Discharge pipe, 4...Blowout nozzle, 5...Washing water supply pipe,
6...Water stop valve for water supply pipe, 7...Water stop valve for washing water pipe, 8...Drain outlet, 9...Water stop valve for drain pipe, 10...Bottom of cooling tank, 11...Water supply pipe, 12 ...Cooling tank, 13...Discharge port, 14
...Drain pipe, 15...Cooling device.

Claims (1)

[Claims] 1. A drainage means that has a hemispherical bottom at the bottom of the cooling tank and connects to the drain outlet from the lowest point in the center, a water supply means that has its tip opened at the top of the cooling tank, and a plurality of water supply means that branch out from the middle of this water supply means and head toward the cooling tank. a cleaning means consisting of a cleaning water supply pipe and a jet nozzle, and the cleaning means penetrates the cylindrical inner wall of the cooling tank with cleaning water supply pipes arranged at equal intervals; The tip of the cleaning water supply pipe is a flat, elongated fan-shaped jet nozzle partitioned by two or more joints, and this jet nozzle is bent and opened toward the inner wall of the tank,
The cleaning water discharged from this nozzle is sprayed onto the inner wall of the tank with a fan-shaped thin layer spreading and swirls around the inner wall of the tank in a helical manner to clean it. A pressure-type water chiller equipped with a constantly-cleaning cooling tank, which is characterized by a water stop valve.