JPH06320139A - Heating and sterilizing apparatus for liquid - Google Patents

Abstract

PURPOSE:To provide a liquid heating and sterilizing apparatus improved in heat efficiency, low in running cost and having sterilizing and heat insulating function. CONSTITUTION:An entry pipeline 2 receiving the supply of a liquid to be treated is connected to the inlet of a boiler 1 and an exit pipeline 3 is connected to the outlet of the boiler 1. A liquid heat exchanger 4 is provided on the way of the entry pipeline 2 and the exit pipeline 3 and the heat energy of the liquid passing through the exit pipeline 3 is recovered by the liquid to be treated passing through the entry pipeline 2 and the liquid to be treated preheated by the liquid heat exchanger 4 is supplied to the boiler 1 to be sterilized under heating. A bypass passage 25 is provided to the exit pipeline 3 so as to bypass the liquid heat exchanger 4. A wax thermometer 26 is provided to the bypass passage 25 and the mixing of the liquid on the side of the bypass passage 25 with the liquid on the side of the exit pipeline 3 is controlled to send out the liquid while the temp. of the liquid is controlled to set heat insulating temp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid heat sterilizer for heat sterilizing liquid such as hot water in a bathtub or industrial water.

[0002]

2. Description of the Related Art For example, as a method for sterilizing hot and cold water in a bathtub, a method is provided in which a circulating pipe for circulating hot and cold water in the bathtub is provided with a filter, and when the circulating hot and cold water passes through the filter, it is sterilized with ozone. In addition, in large public baths, chlorine is put into the bath to sterilize it. In addition, industrial water for cooling molds and the like also has the problem that algae will grow in the molds unless it is sterilized. Therefore, ultraviolet rays are used for sterilization.

[0003]

However, the method of sterilization using ozone or chlorine has a problem that the pipeline through which the liquid to be treated passes is corroded by the chlorine or ozone, and the liquid after sterilization treatment has a problem. There is a problem that odor remains.

Further, the method of sterilization using ultraviolet rays has a problem that the apparatus requires a large scale and it is difficult to perform sterilization within a short time when the liquid to be treated passes through the circulation pipeline.

The present inventor has proposed a method of heat sterilization in order to solve the above conventional problems. It is generally known that bacteria die at a temperature of 60 ° C. or higher, and the liquid to be treated can be sterilized in a short time by heating the liquid to be treated at a temperature of, for example, 70 ° C. As this heat sterilization device, for example, a system in which the liquid to be treated is introduced into a heating means such as a boiler to be sterilized and the sterilized liquid is returned to the original position from the outlet pipe line is conceivable. However, in this method, the heat energy of the high-temperature liquid after heat sterilization is discarded without being reused, so that energy is wasted and the running cost of the apparatus increases.

The present invention has been made to solve the above problems, and an object of the present invention is to recover the heat of a liquid after heat sterilization and reuse it to save energy and reduce the running cost of the liquid. It is to provide a heat sterilizer.

[0007]

In order to achieve the above object, the present invention is constructed as follows. That is, the present invention is provided with a heating means for heating and sterilizing the liquid to be treated supplied from the inlet side pipeline and sending it from the outlet side pipeline, and the liquid in the outlet side pipeline is provided in the middle of the inlet side pipeline. A liquid heat exchanger that recovers heat into the liquid in the inlet pipe is provided, and a bypass passage is provided in the outlet pipe across the liquid heat exchanger. The liquid coming through the liquid heat exchanger at the confluence with the outlet pipe that has flowed out of the reactor is liquid heat exchanged with the liquid coming through the bypass passage when the temperature of the liquid falls below the set temperature for heat retention. The temperature control means is provided for mixing the liquid flowing through the vessel and controlling the temperature of the mixed liquid to a preset temperature for heat retention and delivering the temperature.

[0008]

In the present invention having the above-mentioned structure, the liquid to be treated supplied from the inlet pipe is sterilized by heat treatment in the heating means, and the liquid after sterilization passes through the outlet pipe to the liquid heat exchanger. Leading to. Here, the heat energy of the high temperature liquid in the outlet pipe is taken by the low temperature liquid to be treated in the inlet pipe to recover the energy, and the liquid in the inlet pipe is changed to the liquid in the outlet pipe. The liquid to be treated heated to substantially the same temperature and heated in the liquid heat exchanger is supplied to the heating means and sterilized. Although the temperature of the liquid from which the energy has been recovered in the liquid heat exchanger decreases, when the temperature of the liquid exiting the liquid heat exchanger falls below the set temperature for heat retention, the high temperature of the liquid passing through the bypass passage The liquid is mixed by the temperature control means to compensate for the decrease in temperature, whereby the liquid controlled to the preset heat retention temperature is delivered to the desired delivery destination.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of the first embodiment of the present invention. In the figure, a boiler 1 is used as a heating means for performing sterilization, an inlet side pipeline 2 is connected to an inlet side of the boiler 1, and an outlet side pipeline 3 is connected to an outlet side of the boiler 1. It is connected. The inlet side of the inlet side pipeline 2 and the outlet side of the outlet side pipeline 3 are connected to a bath or a water tank for industrial water.

In this embodiment, a liquid heat exchanger 4 is provided in the middle of the inlet pipe line 2 and the outlet pipe line 3. The liquid heat exchanger 4 is, for example, as shown in FIG.
The pipe connecting portions 6 and 7 are provided at both ends of the tank 5, and the tank 5 is interposed between the inlet pipes 2 by using the pipe connecting portions 6 and 7, and the tank 5 is provided with the outlet pipes. 3 or, on the contrary, a tank 5 is interposed between the outlet side pipe lines 3 and the inlet side pipe line 2 is passed through the tank 5, and the liquid in the outlet side pipe line 3 is formed. Is absorbed by the liquid in the inlet pipe, and the heat energy in the outlet pipe is recovered by the liquid in the inlet pipe. In order to recover this heat energy more efficiently, fins 9 are provided in the pipe penetrating the tank 5 as necessary.

According to this embodiment, the liquid to be treated supplied from the inlet pipe 2 side is heated to, for example, 70 ° C. or higher in the boiler 1 to be sterilized. Then, when the high temperature liquid discharged from the boiler 1 passes through the liquid heat exchanger 4, heat is recovered by the liquid to be treated on the inlet side pipeline 2 side and cooled, and the liquid on the inlet side pipeline 2 side is heated. Then, heat exchange is performed so that both the inlet and outlet liquids have approximately the same temperature. In this way, the liquid heat exchanger 4 recovers the heat energy of the liquid in the outlet conduit 3 and heats the liquid in the inlet conduit 2, so that the heat in the liquid in the outlet conduit 3 is wasted. It will be effectively utilized without being thrown away by
As a result, the combustion energy of the boiler 1 can be reduced accordingly, and the running cost of the device can be significantly reduced.

By the way, the heating means can be constructed by using means other than the boiler. In FIG. 3, the heating means is formed by the water heater 8, the tank 10 and the circulation pump 14. The tank 10 includes a return pipe 11, a circulation pump 14, and a forward pipe.
A circulation pipe line 13 composed of 12 and 12 is connected, and a water heater 8 is provided in the outward pipe 12. By rotating this circulation pump 14, the liquid of the heating source filled in the tank 10 reaches the water heater 8 from the return pipe 11 through the circulation pump 14 and is heated by the water heater 8 to, for example, 70 ° C. or higher. The high-temperature hot water is produced, and this high-temperature hot water is returned to the tank 10 via the outward pipe 12, and the temperature of the liquid of the heating source in the tank 10 is always kept at a high temperature of 70 ° C. or higher.

Inside the tank 10, there is provided a heating pipe line 15 which leads from the inlet pipe line 2 side to the outlet pipe line 3, and the liquid to be treated supplied from the inlet pipe line 2 side is When passing through the heating pipe 15, the liquid is heated and sterilized by the high temperature liquid in the tank 10 and returned to the outlet pipe 3.

FIG. 4 shows a heating means for sterilizing the liquid to be treated, which is constructed by using a heat pump 16. The heat pump 16 includes a condenser heating device 18 and an evaporator heat recovery device 20.
And a refrigerant passage 21, and a compressor 17 and an expansion valve 19 provided in the refrigerant passage 21, and the liquid to be treated supplied through the inlet pipe passage 2 passes through the condenser heating device 18. It is sometimes sterilized by heating, and the sterilized liquid passes through the evaporator heat recovery device 20 and is then returned to the bathtub or the industrial water storage tank through the liquid heat exchanger 4. By using this heat pump as a heating means, it is possible to miniaturize the heat source for sterilization, but when starting the heat sterilization of the liquid to be treated, when the capacity of the heat pump is insufficient, the heat pump 16 is in a steady state. It is also possible to provide an auxiliary heating means for helping the capacity shortage of the heat pump 16 until the start-up.

FIG. 5 shows a constitution in which the heating time for heat-sterilizing the liquid to be treated is extended. In this example,
In order to increase the heating time for sterilization, a bypass pipe line 22 connecting the inlet side pipe line 2 and the outlet side pipe line 3 is provided between the liquid heat exchanger 4 and the boiler 1 and circulated in the bypass pipe line 22. A pump 23 is provided, and a check valve 24 is provided in the inlet side pipe line 2 between the bypass pipe line and the liquid heat exchanger 4.

In this example, the liquid to be treated supplied from the inlet pipe 2 enters the boiler 1 and is sterilized by heating, so that the boiler 1
Most of the delivered liquid amount is sucked to the bypass pipe line 22 side by the drive of the circulation pump 23, and is again guided to the boiler 1 through the inlet pipe line 2. Will be heated. From this circulation pump 23, through the inlet side line 2, the boiler 1 and the outlet side line 3 again the circulation pump.
By repeating the circulation up to 23, the heating time of the liquid to be treated becomes longer, and it becomes possible to surely sterilize the liquid to be treated. Further, the heating temperature for sterilization can be lowered by the amount corresponding to the longer heating time, whereby the combustion energy of the boiler 1 can be reduced and the running cost can be further reduced.

The example of FIG. 6 is also configured so that the heating time of the liquid to be treated is lengthened. In this example, a circulation pipe 13 in which the water heater 8 is incorporated is connected to the tank 10, and a circulation pump 14 is provided in the circulation pipe 13.

With this structure, the liquid to be treated supplied from the inlet pipe line 2 is filled in the tank 10, and the liquid to be treated in the tank 10 is repeatedly passed through the water heater 8 by driving the circulation pump 14. It is circulated and repeatedly sterilized each time it passes through the water heater 8. Then, a part of the sterilized liquid is sent from the tank 10 to the liquid heat exchanger 4 through the outlet pipe line 3.

The apparatus of this embodiment shown in FIG. 1 has a structure suitable for a system of a type in which the temperature of a liquid to be treated in a bathtub or a water tank is kept constant. A bypass passage 25 that straddles the heat exchanger 4 is provided.
The temperature control means such as the wax thermo 26 is provided in the. In this embodiment, when the temperature of the liquid exiting the liquid heat exchanger 4 from the boiler 1 is the set temperature of heat retention, it is returned without passing through the bypass passage 25, but when passing through the liquid heat exchanger 4, the inlet pipe When heat is taken by the liquid on the side of the passage 2 and becomes lower than the set temperature for heat retention, the liquid having a high temperature passing through the bypass passage 25 is kept warm to the liquid having a low temperature passing through the liquid heat exchanger 4. The wax thermo 26 is mixed to reach a set temperature, and the sterilized liquid is controlled to a set temperature and returned to a bath or a water tank.

FIG. 7 shows a second embodiment of the present invention. This second embodiment is a more specific embodiment of the first embodiment and is configured to heat and sterilize the hot and cold water in the bathtub 27 while keeping the hot and cold water in the bathtub 27 at a constant temperature. In this embodiment, the return pipe 28 connected to the bath 27 has a circulation pump 31 through a filter 30 for removing large dust such as hair.
Connected to the water absorption side of. Then, the pipe line on the discharge side of the circulation pump 31 is connected to the sand filter 32 for removing small dust and the like. Further, the outlet side of the sand filter 32 is connected to the inlet side pipe line 2. The liquid discharged from the wax thermo 26 is returned to the bath 27 via the forward pipe 33, and the rest of the configuration from the boiler 1 to the liquid heat exchanger 4 is the same as that of the first embodiment.

In the second embodiment, the hot water sucked by the circulation pump 31 from the bath 27 through the return pipe 28 is a sand filter 32.
And through the liquid heat exchanger 4. Heat is absorbed by heat exchange when passing through the liquid heat exchanger 4, enters the boiler 1, and is sterilized by heating the boiler 1. Then, the sterilized hot water exchanges heat with the liquid to be treated on the side of the inlet side pipe 2 when passing through the liquid heat exchanger 4 to take heat, and when passing through the wax thermo 26, the first embodiment described above. By the same operation of the wax thermostat 26 as described above, the temperature is controlled to a constant heat retention temperature and returned to the bathtub 27 from the outward pipe 33, and the sterilized hot water in the bathtub 27 is kept at a constant heat retention temperature.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in the above-described embodiment, an example in which a boiler, a water heater and a heat pump are used as heating means for heat sterilization has been described, but this heating means can be configured using other heating means such as an electric water heater. .

In each of the above-mentioned embodiments, the bath water or industrial water is used as an example of the liquid to be treated, but other than that, for example, heat sterilization of liquids in various fields such as sterilization of water in pools and the like. It is applied to the device. Further, the heat-sterilized liquid does not necessarily have to be returned to the original place, and can be led to a desired place.

[0024]

INDUSTRIAL APPLICABILITY According to the present invention, the liquid type heat exchange is performed between the liquid in the inlet pipe line to which the liquid to be treated for heat sterilization is supplied and the liquid in the outlet pipe line through which the heat-treated high temperature liquid passes. Since it is configured so that heat is exchanged by the reactor, the liquid to be treated coming through the inlet pipe recovers the heat of the liquid in the outlet pipe when it passes through the liquid heat exchanger and is heated. Since it enters the heating means, the driving energy of the heating means for performing heat sterilization can be reduced accordingly, and the running cost of the heat sterilizer can be reduced.

Further, since the energy of the heat-sterilized high-temperature liquid is recovered and reused when passing through the liquid heat exchanger, the thermal efficiency of the operation of the apparatus is enhanced, and the waste of energy is effectively utilized. be able to.

Further, a bypass passage is provided in the outlet side pipe so as to straddle the liquid heat exchanger, and the bypass passage side is provided at a confluence portion of the bypass passage and the outlet side pipe exiting the liquid heat exchanger. Since the temperature control means for controlling the mixture of the liquid and the liquid on the outlet pipe side to control the temperature of the delivery liquid to the set temperature for heat retention,
The excellent effect that the liquid temperature of the delivery destination, for example, the hot water temperature of the bathtub can be kept warm can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a liquid heat sterilization apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of a liquid heat exchanger used in each example of the present invention.

FIG. 3 is a schematic configuration diagram showing an example of heating means other than a boiler.

FIG. 4 is a schematic configuration diagram showing an example of another heating means.

FIG. 5 is a schematic configuration diagram showing an example of circulation heating of a liquid.

FIG. 6 is a schematic configuration diagram showing another example of circulation heating of a liquid.

FIG. 7 is a schematic configuration diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Boiler 2 Inlet line 3 Outlet line 4 Liquid heat exchanger 25 Bypass passage 26 Wax thermostat

Claims (1)

[Claims] 1. A heating means for heating and sterilizing a liquid to be treated supplied from an inlet side pipe and sending it out from an outlet side pipe, wherein the heat of the liquid in the outlet side line is provided in the middle of the inlet side pipe. Is provided in the liquid in the inlet side pipe, and a bypass passage is provided in the outlet side pipe across the liquid heat exchanger, and the bypass passage and the liquid heat exchanger are provided. The liquid coming out of the bypass passage when the temperature of the liquid exiting through the liquid heat exchanger falls below the set temperature for heat retention at the junction with the outlet pipe A liquid heat sterilizer provided with temperature control means for mixing with the liquid passing therethrough and controlling the temperature of the mixed liquid to a preset temperature for heat retention and sending out.