JP3723195B2 - Sterilization disinfection washing machine - Google Patents

Description

This invention is designed to spray high-temperature water on floors, shelves, conveyors, steamers, kettles and other various machinery and equipment, and floors and machinery and equipment in machinery factories, and sterilize and clean these parts simultaneously. The present invention relates to a sterilizing / disinfecting machine for efficient operation.

JP-A-10-192371 discloses a sterilizing / disinfecting machine in which high-temperature water is sprayed onto a floor of a food factory, a cooking table, and the like to sterilize and disinfect each of these parts at the same time. FIG. 1 shows an outline of the sterilizing / disinfecting washing machine 10, 11 is a burner using city gas or kerosene as fuel, 12 is a base chamber, and an outer cylinder 13 and a middle cylinder 14 are concentric on the upper surface of the base chamber 12. The outer cylinder 13 and the middle cylinder 14 are filled with a heat-resistant heat insulating material 15, and the middle cylinder 14
An exhaust cylinder 14a projects from above, and a coil 17 composed of a fin tube 16 is fixed inside. The fin tube 16 has a fin projecting on the outer surface of a pipe, tap water is supplied to the lower end 16c via a pump (not shown), and hot water is taken out from the upper end 16d. An inner cylinder (combustion cylinder) 18 made of a perforated plate made of a heat-resistant steel plate is installed inside the middle cylinder 14. This combustion cylinder 18
Comprises a plurality of partition plates 18a, 18b, 18c, 18d that divide the interior up and down, and center holes 18e and 18f are opened in the lowermost partition plate 18a and the second partition plate 18b, respectively. The diameter of the former is set larger than that of the latter.
JP-A-10-192371

The sterilizing and disinfecting and washing machine 10 takes out high-temperature water having a temperature of 105 to 120 ° C. from the upper end 16d of the fin tube 16 through a hose and sprays it from a nozzle at the tip of the hose, thereby sterilizing and disinfecting floors and machinery. Washing can be performed simultaneously. However, the above-mentioned sterilizing / disinfecting and washing machine 10 has a large heat loss and is dangerous because high-temperature exhaust gas reaching a temperature of 400 ° C. is exhausted from the exhaust cylinder 14a into the working room. If the coil 17 (heat exchanger) consisting of the tube 16 is long and large and the exhaust temperature is lowered, the sterilization disinfection and washing machine 10 becomes heavy and heavy, and it becomes unstable when it can be moved on a carriage. It was difficult. In addition, when the work is stopped, it takes a long time to cool the fin tube 16 after the burner digestion by flowing tap water, and if the cooling time is too long, condensation occurs on the fins of the fin tube 16. Removal became difficult, causing corrosion, clogging, poor ignition, and the like.

In the present invention, as described above, the coil of the fin tube is erected, and while supplying water to the fin tube with a pump, this water is heated by a burner installed below the center of the coil to generate hot washing water. In the sterilizing and disinfecting and washing machine that discharges the exhaust of the burner to the upper side of the coil, the pressure-regulated surplus water generated in accordance with the pressure control of the water supplied to the fin tube is used for cooling the exhaust. Thus, without increasing the size of the sterilizing / disinfecting / washing machine, the temperature of the exhaust gas is lowered and the heat loss is reduced to improve the thermal efficiency.

The sterilizing and disinfecting and washing machine according to the present invention has two coils of different heights formed by winding two long and short fin tubes of different lengths in a coil shape, with the first coil on the higher side facing down. The lower second coil is placed up and up and down in two stages, and a burner is installed below the center of the first coil to form a vertical flue inside the first coil and the second coil. Is. A discharge side of the water circulation pump is connected to one end of the first coil fin tube via a pressure regulating valve, and a discharge nozzle is connected to the other end of the first coil fin tube via a discharge hose. Further, a sewage pipe for circulating the pressure regulating spilled water of the pressure regulating valve to the water supply side of the water circulation pump is connected to one end of the second coil fin tube, and the water circulation is connected to the other end of the second coil fin tube. Connect the water supply side of the pump.

In the above sterilizing and disinfecting machine, when the water supply side of the water circulation pump is connected to the tap with a hose and the tap water is supplied to the pump, the tap water is pressurized and passes through the pressure regulating valve from the discharge side of the pump. The pressure is controlled to be fed to one end of the first coil fin tube and discharged from the other end via a discharge hose and a discharge nozzle. When the burner is ignited, hot air generated by the combustion rises up the inner flue of the first coil and the second coil and is exhausted from the upper end of the second coil. Here, the fin tube is a kind of heat exchanger in which fins are spirally wound around the outer surface of a pipe made of copper or other metal, so that the hot air is inside the first coil. When passing through the flue, the water flowing through the first coil fin tube is heated to become high-temperature water and discharged from the discharge nozzle.

On the other hand, the low-temperature pressure regulating spill discharged from the pressure regulating valve is divided into one returned to the water supply side of the circulation pump through the spill pipe and one sent to one end of the second coil fin tube. The latter pressure regulating surplus water flows from one end of the fin coil for the second coil toward the other end and is heated by hot air passing through the flue inside the second coil in the meantime to become hot water and circulate as described above Returned to the water supply side of the pump. Therefore, the hot air passing through the flue is cooled, the temperature thereof decreases, and the temperature of tap water supplied to the circulation pump increases.

A first combustion cylinder and a second combustion cylinder made of perforated plates are respectively installed inside the first coil and the second coil, and the flue is formed inside the first combustion cylinder and the second combustion cylinder. In this case, as the fuel burns, the first combustion cylinder and the second combustion cylinder are heated, in particular, the first combustion cylinder is almost uniformly red-heated, and thereby the first coil and the second coil are heated. In addition, complete combustion of the fuel is facilitated. The first combustion cylinder inside the first coil is preferably provided with several partition plates that divide the inside of the first combustion cylinder in the vertical direction, thereby facilitating complete combustion. Moreover, complete combustion can be further facilitated by opening a central hole in the lower side of the partition plate so that the diameter of the lower side becomes larger.

The first coil fin tube may be supplied with tap water at the lower end and discharged from the upper end, and conversely, may be supplied at the upper end and discharged from the lower end. It is more advantageous to supply to the surface in that there is less adhesion of condensation. Also, in the second coil fin tube described above, pressure regulation surplus water may be supplied to the lower end thereof and returned to the pump from the upper end, and conversely, supplied to the upper end and returned from the lower end. However, it is advantageous to supply to the lower end in terms of less condensation.

The sterilizing / disinfecting and washing machine according to the present invention has a tall first coil and a short second coil made up of fin tubes arranged one above the other with the former facing down, and the first coil serves as a washing heat exchanger. The second coil constitutes a heat exchanger for exhaust cooling, supplies low-temperature pressure-regulating surplus water to the second coil, cools the exhaust heat, and supplies the pressure-regulating surplus water heated by this cooling to the water circulation pump In addition to tap water on the water supply side, the above waste heat is used for preheating tap water. Therefore, unlike the case where the second coil is not used and the height of the first coil is increased, the working environment is improved by reducing the temperature of the exhaust gas without changing the size of the sterilizing / disinfecting washing machine. Can be achieved, and heat loss can be reduced to improve thermal efficiency. In addition, as described above, low-temperature pressure-regulating surplus water is supplied to the second coil and tap water is supplied to the first coil. Therefore, when the operation is stopped, the cooling of the first coil and the second coil is conventionally reduced. Although it is performed gently, it can be done in a short time and can prevent condensation and clogging due to overcooling. In particular, the invention according to claim 2 enables complete combustion of the fuel and further improves the thermal efficiency.

In the sterilizing / disinfecting machine 20 shown in FIG. 2, an outer cylinder 23 and a first middle cylinder 24 are provided concentrically on a base chamber 22 provided with a burner 21, and the first middle cylinder 24 has a first inside. A first coil 27 comprising a fin tube 26 is installed, and a first combustion cylinder 28 is installed inside the first coil 27. The first middle cylinder 24, the first fin tube 26, the first coil 27 and the first combustion cylinder 28 correspond to the middle cylinder 14, the fin tube 16, the coil 17 and the inner cylinder 18 of FIG. The middle cylinder 24 is provided with an exhaust cylinder 24a at the upper end, and the first combustion cylinder 28 is provided with partition plates 28a, 28b, 28c and 28d in the same manner as described above.

In the present invention, a second middle cylinder 34 having a height which is a fraction lower than that of the first middle cylinder 24 is stacked on the first middle cylinder 24, and a second fin is disposed inside the second middle cylinder 34. A second coil 37 made of a tube 36 is fixed, a second combustion cylinder 38 made of a perforated plate is installed inside the second coil 37, a second exhaust cylinder 34a is mounted on the second middle cylinder 34, and the above-mentioned Third exhaust cylinders 23a are respectively projected on the outer cylinder 23, and a flue toward the exhaust cylinder 23a is formed above the burner 21. An asbestos-like heat-resistant heat insulating material (trade name “Fineflex”) 15 made of ceramics is filled between the outer cylinder 23, the first middle cylinder 24 and the second middle cylinder 34.

The discharge side 40a of the water circulation pump 40 is connected to the lower end of the first fin tube 26 constituting the first coil 27 via the discharge pipe 41, the pressure regulating valve 42 and the cleaning water supply pipe 43, and the first fin tube A discharge nozzle (not shown) is connected to the upper end of 26 via a cleaning hose 44. On the other hand, the lower end of the second fin tube 36 of the second coil 37 is connected to the first discharge port 45a of the T joint 45 connected to the pressure adjusting surplus water discharge port of the pressure regulating valve 42 via the cooling water supply pipe 46. The upper end of the second fin tube 36 is connected to the first water supply port 47a of the T joint 47 fixed to the A port 40c on the water supply side 40b of the water circulation pump 40 by a return pipe 48.

And the 2nd discharge port 45b of the T joint 45 connected to the pressure regulation surplus water discharge port of the said pressure regulation valve 42 is connected to B port 40d of the water supply side 40b of the water circulation pump 40 by the surplus water pipe 49, The second water supply port 47b of the T joint 47 fixed to the A port 40c on the water supply side 40b of the water circulation pump 40 is a water tap (not shown) through the water supply pipe 50, the electromagnetic on-off valve 51, and the flow rate switch 52. ). The water supply section including the water circulation pump 40, the pressure adjustment valve 42, the water supply pipe 50, the electromagnetic on-off valve 51, the flow rate switch 52, and the like includes the kerosene burner 21, the base chamber 22, the outer cylinder 23, and the first middle cylinder. 24, the first coil 27, the first combustion cylinder 28, the second middle cylinder 34, the second coil 37, the second combustion cylinder 38 and the like are installed on the carriage and integrated as a movable sterilizing / disinfecting washing machine. It becomes.

In the above structure, when the operation is started, the burner fan attached to the burner 21 is rotated, the water circulation pump 40 is subsequently driven, and tap water is supplied to the water supply pipe 50, the water circulation pump 40, the pressure adjustment valve 42, and the cleaning water supply pipe. It is sent to the first fin tube 26 through 43 and further discharged from the discharge nozzle through the cleaning hose 44. A part of the pressure regulating surplus water generated by the pressure regulating valve 42 is sent to the second fin tube 36 through the cooling water supply pipe 46, passes through the second fin tube 36, and then circulates through the return pipe 48. The remaining pressure-regulated waste water is returned to the water circulation pump 40 through the spill pipe 49. When the water circulation starts and water is discharged from the discharge nozzle, the burner 21 is ignited, the water passing through the first fin tube 26 is heated, and high-temperature water is discharged from the discharge nozzle. It becomes. On the other hand, the low-temperature pressure-regulating surplus water flowing through the second fin tube 36 cools the exhaust gas that has flowed into the second coil 37 from the exhaust cylinder 24a, and this cooling increases the temperature in the second fin tube 36. The excess pressure water is returned from the return pipe 48 to the control pump 40 and added to the tap water from the water supply pipe 50 to always warm the tap water.

When the cleaning operation is completed and the operation stop button is pressed, the burner 21 is first extinguished, and the water circulation pump 40 is stopped after the set time, but until then, water circulation and water discharge from the discharge nozzle are continued, Heat exchange in the first fin tube 26 and the second fin tube 36 continues. Then, after the next set time, the electromagnetic on-off valve 51 is closed, the burner fan is stopped, and cooling water discharge is completed. Although the water circulation is stopped by stopping the water circulation pump 40, the water temperature rises slightly due to the residual heat of the first fin tube 26 and the second fin tube 36 and the electromagnetic on-off valve 51 is closed until the water is closed. Since pressure is applied, water breakage in the fin tubes 26 and 36 does not occur, natural cooling is performed, condensation does not occur in the fin gaps of the fin tubes 26 and 36, and accidents such as clogging and burner ignition failure occur. Is prevented.

A sterilization / disinfecting machine (Example) shown in FIG. In other words, a copper fin tube with a 3.2mm height fin protruding in a spiral shape on the outer surface of a pipe with an outer diameter of 15.0mm was cut into a length of 5731mm, wound in a coil shape and wound 11 times, an outer diameter of 212mm and a height of 310mm The first coil 27 was used. The same fin tube was cut to a length of 1563 mm, wound into a coil shape, and made into a second coil 37 of 3 turns and a height of 67 mm. Also, a kerosene burner is used as the burner 21, and water having a pressure of 3.5 to 14 Pa and a temperature of 27 ° C. is supplied to the first coil 27 at a flow rate of 5.2.
When the pressure adjusting surplus water is supplied to the second coil 37 at a flow rate of 2.0 to 3.0 l / min, the temperature of the high-temperature water discharged from the first coil 27 is 120 ° C., and the second coil 37 is supplied. The temperature of the hot water supplied to was 35 ° C, and the temperature of the exhaust was 150 ° C.

On the other hand, when the second coil 37 of the above example was omitted and the first coil 27 was used to produce a sterilizing / disinfecting and cleaning machine of Comparative Example 1, water was supplied to the first coil 27 in the same manner as in the example. The temperature of the hot water was 120 ° C and the temperature of the exhaust was 250-400 ° C. In addition, 14 coils of a 7300 mm long fin tube in which the fin tubes of the first coil 27 and the second coil 37 of the above embodiment are combined to make a coil having a height of 377 mm. When a washing machine was prototyped and water was supplied to this coil in the same manner as in Example 1, the temperature of the high-temperature water was 120 ° C., and the temperature of the exhaust was 250 to 300 ° C. In addition, the first coil 27 of the above-described embodiment of the first coil 27 is connected to the 1150 mm long fin tube 22 times to make a coil of 620 mm in height. When water was supplied to this coil in the same manner as in Example 1, the temperature of the high-temperature water was 120 ° C., and the temperature of the exhaust was 160 ° C.

It is sectional drawing of the principal part of the conventional apparatus. It is structure explanatory drawing of embodiment.

Explanation of symbols

20: Sterilization disinfection washing machine
21: Burner
22: Base chamber
23: outer cylinder
24: 1st middle cylinder
26: 1st fin tube
27: 1st coil
28: First combustion cylinder
34: Second inner cylinder
36: 2nd fin tube
37: Second coil
38: Second combustion cylinder
23a, 24a, 34a: Exhaust pipe
40: Circulation pump, 40a: Discharge side, 40b: Water supply side
42: Pressure regulating valve
44: Cleaning hose
46: Water supply pipe for cooling
49: Spillway
51: Solenoid valve
52: Flow rate switch

Claims (2)

Two long and short fin tubes of different lengths are wound in a coil shape, and two coils of different heights are arranged, with the higher first coil on the lower side and the lower second coil on the upper side. The upper and lower two stages are installed, and a burner is installed below the center of the first coil to form a vertical flue inside the first coil and the second coil. A discharge side of the water circulation pump is connected to one end via a pressure regulating valve, a discharge nozzle is connected to the other end of the first coil fin tube via a discharge hose, and the one end of the second coil fin tube is connected to the above A sterilization system characterized in that a sewage pipe for circulating pressure regulation sewage of a pressure regulating valve to the water supply side of the water circulation pump is connected, and a water supply side of the water circulation pump is connected to the other end of the fin coil for the second coil. Disinfection cleaning machine. A first combustion cylinder and a second combustion cylinder each made of a perforated plate are installed inside the first coil and the second coil, respectively, and a flue is formed inside the first combustion cylinder and the second combustion cylinder. The sterilizing / disinfecting machine according to claim 1, wherein the cylinder is provided with several partition plates that divide the inside of the cylinder up and down.

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