JP3294398B2 - Heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating apparatus for high-temperature sterilization of liquids, for example, from 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 flash sterilizer, an untreated liquid must be heated to a predetermined temperature for high-temperature sterilization.

Conventionally, in this type of heating apparatus, three types, a plate type, a tube type and a scraping type, have been used. However, these types have the following problems. In the plate method, (1) heat denaturation and burning of the liquid to be treated occur due to uneven heating and residence time. This is because dead space is inevitably structurally present at the contact portion of each leaf of the plate and at the seal packing portion of each leaf, thus causing flow stagnation.

(2) It cannot be used for sterilization of highly viscous liquids. This is the shape and thickness of the plate (usually
m), 5kg /
This is because it is difficult to manufacture a device capable of withstanding a liquid supply pressure requiring a pressure of cm ² G or more.

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

[0006] This means that sufficient cleaning cannot be performed when sterilizing by changing the type of the liquid to be treated.

In the case of the tube type, there are the following problems: (1) The fluid flow inherent in the tube occurs in that the flow rate is high at the center of the tube and low at the tube wall.
The heating time from when the liquid enters to when it exits and the rate of temperature rise are not uniform.

(2) Although it is possible to manufacture an apparatus having a pressure-resistant structure necessary for sterilization of a highly viscous liquid, as a result of the structure of a tube, it is impossible to inspect and clean the inside with the naked eye, and only to wash a chemical solution. Is possible.

(3) The heat transfer coefficient is as low as 200 to 1000 kcal / m ² h ° C. in heating water. This causes burns 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 treatment temperature. In order to prevent this, it is necessary to enlarge the heat transfer surface, and the device becomes large.

There has been a problem that:

[0011] Next, in the scraping method, (1) Due to the structure, two strip-shaped scrapers are rotating on the inner peripheral surface of the cylindrical heat transfer, so that the flow velocity is not uniform between the central part and the peripheral part of the cylinder. Therefore, a temperature difference occurs in the liquid temperature, and it is difficult to perform uniform sterilization, and the residence time is not uniform.

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

(3) Since the heat transfer area is small as compared with the ratio of the retained volume inside, rapid temperature rise is not possible. This causes the liquid to be treated to undergo thermal denaturation, and the scraped object accumulates on the scraper, thermally denatures and stays.

There was a problem that:

[0015]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a high-temperature instant which can uniformly raise the temperature up to sterilization without causing burning in a short time, and which is easy to disassemble, inspect and clean the heat transfer surface. A heating device for a sterilizer is provided.

[0016]

According to the present invention, a cylinder having a helical ridge formed on an outer peripheral surface thereof is provided in a hollow housing so as to be vertically movable, and is provided between the ridge, the cylinder and the inner circumference of the hollow housing. Defining a helical flow path therebetween, defining a chamber of the heating medium radially outward or inward of the helical flow path, forming a helical groove at the edge of the helical ridge,
A synthetic resin tube is placed in the helical groove, a synthetic resin tube is wound around the helical groove, and a metal wire for fixing is inserted into the synthetic resin tube. 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 having a high heat resistance and a small coefficient of friction since the treatment liquid is unlikely to adhere thereto.

[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 in the cylinder axis direction and the inner side in the radial direction of the Teflon tube are suppressed to the side and the bottom of the helical groove, respectively, they bulge outward in the radial direction and come into close contact with the inner periphery of the hollow housing. for that reason,
The helical passage is securely sealed.

Further, at the time of washing, that is, at the time of non-heating, the Teflon tube contracts and returns to its original shape. Therefore, a gap is formed between the Teflon tube and the inner periphery of the hollow housing. As a result, the cylinder can be easily pulled out in the axial direction.

[0020]

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

In FIG. 1, a heating device for a high-temperature instantaneous sterilizer, which is generally shown by reference numeral 10 and in which the present invention is implemented, includes an outer cylinder 1.
2 and a 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 metal cylinder 20 such as stainless steel is housed concentrically and slidably in the axial direction with respect to the fixed hollow housing 11.
A hollow shaft 27 is fitted. An inner cylinder steam chamber 28 is defined between the outer periphery of the hollow shaft 27 and the cylinder 20.
The inner periphery of the hollow shaft 27 is covered with a tubular heat insulating material 29.

The fixed hollow housing 11 is erected on the upper stage S1. On the lower stage S2, a column 30 for supporting the hollow shaft 27 up and down via the inner cylindrical slide metals 31, 31 is freely erected. Has been established. A hydraulic cylinder 32 is erected concentrically with the column 30 on a support mount 30 a provided at the bottom of the column 30, and the top of the piston rod 33 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. When the hydraulic cylinder 32 is reduced, the cylinder 20 and the hollow shaft 27 are separated from the fixed hollow housing. It is pulled down to open all the heat transfer surfaces.

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. Note that reference numerals 44 and 45 in the figure are hydraulic hoses,
Reference numeral 48 denotes a wear ring, which is fitted to the upper and lower ends of the cylinder 20 in accordance with the inner diameter of the inner cylinder 13 so as to load and fix the cylinder 20 at the center position of the inner cylinder 13 of the fixed housing. 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 cylinder 13 and the inner cylinder 13. A processing liquid inlet 46 is provided at a lower portion of the helical flow path 26, and a processing liquid outlet 47 is provided at an upper portion on the opposite side.

A helical groove 22 is formed at the edge of the helical ridge 21, and a synthetic resin tube, for example, a Teflon tube 23 is accommodated in the helical groove 22. A metal wire 2 is inserted into the inner hole of the Teflon tube 23.
The Teflon tube 23 passing through the metal wire 25 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. Further, a small gap C (for example, 0.2 mm) is formed between the Teflon tube 23 and the inner cylinder 13 at the time of non-heating.

In operation, steam 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
Of the helical ridge 21 is heated. Here, since the expansion coefficient of the Teflon tube 23 is larger than that of the metal helical ridge 21, the Teflon tube 23 expands.

However, since the side and bottom of the Teflon tube 23 are restrained by the side and bottom of the helical groove 22, the Teflon tube 23 bulges outward in the radial direction. become. If the operation is performed at a temperature equal to or higher than the temperature at which the gap C becomes zero, for example, at 140 ° C., the excessive expansion of the Teflon tube is absorbed by the buffer action of the inner space 24 provided in the inner hole of the Teflon tube 23. Can be. Therefore, a sealed helical passage 26 is formed. Therefore, the processing liquid inlet 4
When the processing liquid is supplied from the helical flow path 26
, While being discharged from the processing liquid outlet 47 through the processing liquid outlet 47, the processing liquid is heated by the steam in the outer cylinder steam chamber 14 and the inner cylinder steam chamber 28, and the processing liquid is heat-sterilized in a very short time.

On the other hand, at the time of non-treatment, that is, at the time of non-heating, the gap C is formed in the original shape because the Teflon tube 23 is not heated. Therefore, when the hydraulic cylinder 32 is reduced, 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, the O-ring packing 4
Nine compression allowances S are 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 housing inner cylinder 1
When loading and unloading the helical ridge 21, the Teflon tube 23 of the helical ridge 21 is protected by the upper O-ring packing so as to prevent the Teflon tube 23 from rubbing against the inner wall of the inner housing 13 and can move up and down. Also, since the inner surface of the housing inner cylinder 13 is concentric and has the same cylindrical shape, the upper surface of the cylinder 20 is pulled out while cleaning the inner wall surface of the housing 13 by the O-ring packing. To replace the O-ring packing 49, replace the cylinder 20 with the inner cylinder 1 of the housing.
3 can be easily performed in a state where it is pulled out.

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

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

In the heating device embodying the present invention, the temperature difference between the steam of the heating medium and the water of the liquid to be treated is 2 due to the combination of the helical ridge, the helical groove, the synthetic resin tube and the metal wire.
Even when the temperature is about 3 ° C., the heat transfer rate of water at 120 ° C. is 150
The temperature 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 there is no deterioration in the quality (for example, a decrease in the medicinal effect of Chinese medicine). Also, when disassembled, all the heat transfer surfaces inside can be opened by hydraulic pressure.

[0035]

Since the present invention is configured as described above, the following effects can be obtained.

(1) Since the Teflon tube is provided in the cylinder having the helical flow path, it can be easily taken out of the hollow housing, so that the visual inspection and cleaning of the heat transfer surface can be easily performed. .

(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 it can be sent at a high supply pressure. A large flow velocity can be obtained, and a large heat transfer coefficient can be obtained from an increase in the number of Reynolds nozzles (the number of turbulent flows of the fluid).

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

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one 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. 2;

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

FIG. 5 is a flow sheet diagram showing an example of a high-temperature flash sterilizer embodying 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 ... Connection flange 40,42 ... Steam Entrance 41, 43 ... Dre Outlet 44, 45 ... hydraulic hose 46 ... treatment liquid inlet 47 ... treatment liquid outlet 48 ... wear ring 49 ... O-ring

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁷ , DB name) A23L 3/22 A61L 2/06 F28D 7/02 Patent file (PATOLIS)

Claims (1)

(57) [Claims] A cylinder having a helical ridge formed on an outer peripheral surface thereof is provided in a hollow housing so as to be vertically movable.
A helical flow path is defined between the cylinder and the inner periphery of the hollow housing, and a chamber for the heating medium is defined radially outward or inward of the helical flow path. A helical groove is formed, a synthetic resin tube is housed in the helical groove, a metal wire for winding the synthetic resin tube around the helical groove is inserted into the synthetic resin tube, and the synthetic resin tube and the hollow housing are not heated when not heated. A heating device having a gap formed therebetween.