JPH07107949A - Apparatus for heating - Google Patents

Abstract

PURPOSE:To uniformly increase the temperature to a sterilizing temperature in a short time without causing scorching and facilitate the disassembling, inspecting and washing. CONSTITUTION:This apparatus for heating is provided by forming a helical flow passage (26) from an inner cylinder (13) and a cylinder (20) of a fixed hollow housing (11) and a helical protruding ridge (21) formed in the cylinder (20), further forming a helical groove (22) in the end edge part of the helical protruding ridge (21), housing a Teflon(R) tube (23) in the helical groove, inserting and passing a metallic wire (25) for wrapping the Teflon(R) tube (23) around the helical groove (22) and fixing the Teflon(R) tube (23) through the Teflon(R) tube (23), providing an inner hole space (24) in the inner hole part of the Teflon(R) tube and forming a clearance (C) between the Teflon(R) tube (23) and the inner cylinder (13) at the time of no heating.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to a heating device for high temperature sterilization of liquids, for example low viscosity liquids such as coffee solutions, to high viscosity liquids such as curries.

[0002]

2. Description of the Related Art As is well known, in a high temperature instant sterilizer, an untreated liquid must be heated to a predetermined temperature for high temperature sterilization.

Conventionally, in this type of heating device, three systems of a plate system, a tube system and a scraping system have been used, but these systems have the following problems. In the plate type, (1) heat denaturation and burn-in of the liquid to be treated occur due to uneven heating and residence time. This is because a dead space is structurally inevitably present in the contact portion of each leaf of the plate and the seal packing portion of each leaf, and therefore stagnation is caused by the flow, and it is particularly remarkable in a viscous liquid.

(2) It cannot be used for sterilization of highly viscous liquids. This is the shape of the plate, the plate thickness (usually 05 to 1 m
5 kg / due to structural problems such as m) and seal packing
This is because it is difficult to manufacture a device that can withstand a liquid supply pressure that requires a pressure of cm ² G or more.

(3) Disassembly and inspection are complicated, and it is difficult to clean the inside.

This means that sufficient cleaning cannot be performed when the liquid to be treated is changed and sterilized.

In the tube type, (1) a fluid phenomenon inherent to the tube occurs, in which the flow velocity is high in the central portion of the tube and slow in the wall surface of the tube,
The heating time from the entering of the liquid to the exit and the temperature rising rate are not uniform.

(2) Although it is possible to manufacture a device having a pressure resistant structure necessary for sterilization of a highly viscous liquid, as a result of the structure of the tube, it is impossible to visually inspect and clean the inside, and only the chemical solution is washed. Is possible.

(3) The heat transfer coefficient is as low as 200 to 1000 kcal / m ² h ° C. when heating water. This causes burn-in on the inner wall surface of the tube because the temperature of the supply heat medium (for example, steam) is considerably higher than the sterilization temperature. In order to prevent this, it is necessary to enlarge the heat transfer surface and the device becomes large.

There is a problem that

Next, in the scraping method, (1) because of the structure, two strip-shaped scrapers rotate on the inner peripheral surface of the heat transfer cylinder, so that the flow velocity becomes non-uniform between the center part and the peripheral part of the cylinder. Therefore, a temperature difference occurs in the liquid temperature, uniform sterilization is difficult, and the residence time is uneven.

(2) Since the structure is complicated and disassembly and inspection are difficult, cleaning and cleaning of the inside are complicated.

(3) Since the heat transfer area is smaller than the ratio of the internal retention volume, rapid temperature rise cannot be performed. This causes thermal denaturation of the liquid to be treated, and the scraped object accumulates on the scraper and is thermally denatured and stays.

There is a problem that

[0015]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a high temperature instant in which the temperature can be uniformly increased to sterilization without causing sticking in a short time, and disassembly, heat transfer surface inspection and cleaning are easy. A heating device for a sterilizer is provided.

[0016]

According to the present invention, a cylinder having a helical projection formed on the outer peripheral surface thereof is provided in a hollow housing so as to be movable up and down, and the projection, the cylinder and the inner circumference of the hollow housing are connected to each other. A helical flow path is defined therebetween, a heating medium chamber is defined radially outward or inward of the helical flow path, and a helical groove is formed at an end portion of the helical protrusion.
A synthetic resin tube is housed in the helical groove, a metal wire for winding and fixing the synthetic resin tube around the helical groove is inserted into the synthetic resin tube, an inner hole space is provided in an inner hole portion of the synthetic resin tube, and when not heated. A gap is formed between the synthetic resin tube and the hollow housing.

As the synthetic resin tube, it is preferable to use a Teflon tube which has a high heat resistance, a treatment liquid does not easily adhere thereto, and a friction coefficient is small.

[0018]

In the heating device configured as described above,
Since the Teflon tube has a larger expansion coefficient than a metal cylinder, it expands when heated. Since the inner side of the Teflon tube in the cylinder axis direction and the inner side in the radial direction are respectively restrained by the side portion and the bottom portion of the helical groove, the Teflon tube bulges outward in the radial direction and adheres closely to the inner circumference of the hollow housing. for that reason,
The helical passage is reliably sealed.

During cleaning, that is, when not heated, the Teflon tube contracts and returns to its original shape. Therefore, a gap is formed between the Teflon tube and the inner circumference of the hollow housing. As a result, the cylinder can be easily withdrawn in the axial direction.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a heating apparatus for a high temperature instantaneous sterilizer, which is generally designated by 10 and embodying the present invention, includes an outer cylinder 1
2 and fixed hollow housing 1 formed outside the inner cylinder 13
1 is provided. A ring-shaped outer cylinder steam chamber 14 is defined between the outer cylinder 12 and the inner cylinder 13 and is reinforced by a plurality of reinforcing ribs 15.

Inside the inner cylinder 13, a cylinder 20 made of metal such as stainless steel is housed concentrically with the fixed hollow housing 11 so as to be slidable in the axial direction.
The hollow shaft 27 is fitted. An inner cylinder steam chamber 28 is defined between the outer circumference of the hollow shaft 27 and the cylinder 20,
The inner circumference of the hollow shaft 27 is covered with a cylindrical heat insulating material 29.

The fixed hollow housing 11 is erected on the upper stage S1, and on the lower stage S2, a column 30 for vertically supporting the hollow shaft 27 via inner cylinder slide metals 31, 31 is erected. It is set up. A hydraulic cylinder 32 is erected concentrically with the support column 30 on a support mounting base 30 a provided at the bottom of the support column 30, and the top of the piston rod 33 of the hydraulic cylinder 32 is connected to the cylinder 20 and the hollow shaft 27 via a connecting flange 34. Is connected to the top surface of. Therefore, when the hydraulic cylinder 32 is extended, the cylinder 20 and the hollow shaft 27 are loaded into the fixed hollow housing 11 to define a helical flow path, and when the hydraulic cylinder 32 is reduced, the cylinder 20 and the hollow shaft 27 are separated from the fixed hollow housing. All heat transfer surfaces are opened by pulling out downward.

A steam inlet 40 is provided in the upper part of the outer cylinder steam chamber 14, and a drain outlet 4 is provided in the lower part on the opposite side.
1 is provided. A steam inlet 42 and a drain outlet 43 are provided at the bottom of the inner cylinder steam chamber 28 so as to face each other. Reference numerals 44 and 45 in the figure are hydraulic hoses,
48 is a wear ring, and 49 is an O-ring packing which is fitted to the upper and lower ends of the cylinder 20 in accordance with the inner diameter of the inner cylinder 13 for loading and fixing the cylinder 20 in the center position of the fixed housing inner cylinder 13. is there.

Referring also to FIGS. 2 and 3, a helical ridge 21 is formed on the outer periphery of the cylinder 20.
A helical channel 26 having a rectangular cross section is defined between the inner tube 13 and the inner tube 13. A treatment liquid inlet 46 is provided in the lower portion of the helical flow path 26, and a treatment liquid outlet 47 is provided in the upper portion on the opposite side.

A helical groove 22 is formed at the edge of the helical protrusion 21, and a synthetic resin tube such as a Teflon tube 23 is housed in the helical groove 22. In the inner hole of the Teflon tube 23, the metal wire 2
5, the Teflon tube 23 through which the metal wire 25 is passed is wound around the helical groove 22 at the time of assembly, and the metal wire 25 is pulled so that the Teflon tube 23 is fixed to the helical groove 22 by the metal wire 25. Has become. A slight gap C (for example, 0.2 mm) is formed between the Teflon tube 23 and the inner cylinder 13 when not heated.

In operation, steam serving as a heating medium is supplied to the outer cylinder steam chamber 14 from the steam inlet 40, and steam is supplied to the inner cylinder heating chamber 28 from the steam inlet 42. The cylinder 20
The helical ridge 21 of is heated. Here, since the expansion coefficient of the Teflon tube 23 is larger than that of the metallic helical protrusion 21, the Teflon tube 23 swells.

However, since the side portion and the bottom portion of the Teflon tube 23 are restrained by the side portion and the bottom portion of the helical groove 22, the Teflon tube 23 bulges outward in the radial direction, and the gap C is zero at 120 ° C., for example. become. If the gap C is above the temperature at which it becomes zero, for example, at 140 ° C., the buffer space of the inner hole space 24 provided in the inner hole of the Teflon tube 23 absorbs the excessive swelling of the Teflon tube. You can Therefore, a sealed helical passage 26 is formed. Therefore, the processing liquid inlet 4
When the processing liquid is supplied from No. 6, the processing liquid flows in the helical flow path 26.
While being discharged from the treatment liquid outlet 47 through the treatment liquid, the treatment liquid is heated by the steam in the outer cylinder steam chamber 14 and the inner cylinder steam chamber 28, and the treatment liquid is sterilized by heating in a very short time.

On the other hand, at the time of non-treatment, that is, at the time of non-heating, since the Tefunulo tube 23 is not heated, the gap C is formed in the original shape. Therefore, when the hydraulic cylinder 32 is contracted, the cylinder 20 and the hollow shaft 27 are pulled out downward. Therefore, the inner circumference of the inner cylinder 13 and the outer circumference of the cylinder 20 that define the helical flow path 26 can be easily cleaned.

As shown in FIG. 4, O-ring packing 4
The compression margin S of 9 is made equal to the difference S ′ between the inner wall surface of the housing inner cylinder 13 and the diameter of the seal portion. Thus S = S '
By setting the cylinder 20 to the inner cylinder 1 of the housing
When loading and pulling out to and from 3, the Teflon tube 23 of the helical projection 21 can be moved up and down while being protected by the upper O-ring packing so as not to rub against the inner wall of the hoisting inner cylinder 13. Further, since the inner surface of the housing inner cylinder 13 is concentric and has the same diameter, the upper O-ring packing of the cylinder 20 removes dirt while cleaning the inner wall surface of the housing 13. The O-ring packing 49 is replaced by replacing the cylinder 20 with the housing inner cylinder 1.
It can be easily done in the state of being pulled out from 3.

FIG. 5 shows an example of the flow for carrying out the present invention. The liquid to be treated is pressurized to 5 to 15 kg / cm ² G by the feed pump 1, heated to 80 to 90 ° C. by the preheater 2, and It is heated to 120 ° C. to 140 ° C. by the heating device 3 embodying the invention. Next, the holding unit 4 holds it for 10 to 30 seconds, and the cooling device 5 holds it at 50 ° C to 5 ° C.
2 to 4 kg / c by pressure control valve 6
m ² G supplied as a treated liquid.

As the preheater 2, any known heat exchanger, for example, a tube type can be used, and it is used in a low temperature range where the liquid to be treated does not undergo thermal denaturation or sticking.

In the heating apparatus embodying the present invention, the temperature difference between the vapor of the heating medium and the water of the liquid to be treated is 2 due to the combination of the helical protrusion, the helical groove, the synthetic resin tube and the metal wire.
Even at about 3 ° C, the heat transfer coefficient of 120 ° C water is 150
It was 0 to 2000 Kcal / m ² h ° C., which was about twice that of the known technique.

Therefore, there is no burning or thermal denaturation of the liquid to be treated and no deterioration in quality (for example, decrease in medicinal effect in Chinese herbs). Also, when disassembling, all the heat transfer surfaces inside can be opened by hydraulic pressure.

[0035]

Since the present invention is constructed as described above, it has the following effects.

(1) Since the cylinder having the helical flow path is provided with the Teflon tube, it can be easily taken out from the hollow housing, and therefore the heat transfer surface can be visually inspected and cleaned easily. .

(2) Since the heating and heat transfer surface is a cylinder having the same diameter in the upper and lower parts, it is easy to manufacture, sufficient mechanical strength can be obtained, and the liquid can be sent at a high supply pressure. A large heat transfer coefficient can be obtained by increasing the flow velocity and increasing the Reynolds number (turbulent flow related number of fluids).

(3) Since the cross section of the flow path from the inlet to the exit is defined by the same smooth rectangle, the residence time is constant and the distance from the center of the flow path to the heat transfer surface is short and uniform. Is. Therefore, the heat transfer is uniform and the fluid velocity in each part of the flow path cross section is also uniform.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a correlation diagram between a cylinder and an inner cylinder of a fixed housing.

FIG. 5 is a flow sheet diagram showing an example of a high-temperature instant sterilization device for carrying out the present invention.

[Explanation of symbols]

 C ... Gap S1 ... Upper stage S2 ... Lower stage 1 ... Pump 2 ... Preheater 3 ... Heating device 4 ... Holding unit 5 ... Cooling device 6 ... Pressure control valve 10 ... Heating device 11 ... Fixed hollow housing 12 ... Outer cylinder 13 ... Inner cylinder 14 ... Outer cylinder Steam chamber 15 ... Reinforcing rib 20 ... Cylinder 21 ...・ Helical ridge 22 ・ ・ ・ Helical groove 23 ・ ・ ・ Teflon tube 24 ・ ・ Inner hole space 25 ・ ・ ・ Metal wire 26 ・ ・ ・ Helical flow path 27 ・ ・ ・ Hollow shaft 28 ・ ・ ・ Inner cylinder steam chamber 29・ ・ ・ Insulation material 30 ・ ・ ・ Support 30a ・ ・ ・ Support mount 31 ・ ・ ・ Inner cylinder slide metal 32 ・ ・ ・ Hydraulic cylinder 33 ・ ・ ・ Piston rod 34 ・ ・ ・ Coupling flanges 40, 42 ・ ・ ・ Steam Entrance 41, 43 ... Outlet 44, 45 ... hydraulic hose 46 ... treatment liquid inlet 47 ... treatment liquid outlet 48 ... wear ring 49 ... O-ring

Claims (1)

[Claims] 1. A cylinder having a helical projection formed on an outer peripheral surface thereof is provided in a hollow housing so as to be movable up and down.
A helical flow path is defined between the cylinder and the inner circumference of the hollow housing, and a heating medium chamber is defined radially outward or inward of the helical flow path, and at the edge of the helical protrusion. A helical groove is formed, a synthetic resin tube is housed in the helical groove, a metal wire for winding and fixing the synthetic resin tube around the helical groove is inserted into the synthetic resin tube, and when the synthetic resin tube and the hollow housing are not heated, A heating device characterized in that a gap is formed therebetween.