CN111838312A - Milk fermentation tank with excellent heat exchange performance - Google Patents
Milk fermentation tank with excellent heat exchange performance Download PDFInfo
- Publication number
- CN111838312A CN111838312A CN202010715721.6A CN202010715721A CN111838312A CN 111838312 A CN111838312 A CN 111838312A CN 202010715721 A CN202010715721 A CN 202010715721A CN 111838312 A CN111838312 A CN 111838312A
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- Prior art keywords
- inner container
- heat exchange
- barrel
- fermentation tank
- exchange performance
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- 238000000855 fermentation Methods 0.000 title claims abstract description 34
- 230000004151 fermentation Effects 0.000 title claims abstract description 34
- 239000008267 milk Substances 0.000 title claims abstract description 31
- 235000013336 milk Nutrition 0.000 title claims abstract description 31
- 210000004080 milk Anatomy 0.000 title claims abstract description 31
- 238000003756 stirring Methods 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000004806 packaging method and process Methods 0.000 claims abstract description 18
- 238000009413 insulation Methods 0.000 claims abstract description 4
- 239000011521 glass Substances 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 235000020124 milk-based beverage Nutrition 0.000 description 2
- 238000012946 outsourcing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
- A23C9/00—Milk preparations; Milk powder or milk powder preparations
- A23C9/12—Fermented milk preparations; Treatment using microorganisms or enzymes
- A23C9/122—Apparatus for preparing or treating fermented milk products
- A23C9/1226—Apparatus for preparing or treating fermented milk products for making set yoghurt in containers without stirring, agitation or transport of the yoghurt or the containers during incubation, heating or cooling; Domestic yoghurt apparatus without agitating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/04—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being spirally coiled
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Microbiology (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Dairy Products (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention provides a milk fermentation tank with excellent heat exchange performance, which aims at the defects of poor heat exchange performance and easy vortex effect generation of the milk fermentation tank in the prior art, belongs to the technical field of milk processing equipment, and comprises an outer package cylinder and a liner cylinder, wherein the liner cylinder is provided with a feed inlet and a discharge outlet, the outer surface of the liner cylinder is coiled with a plurality of sections of mutually independent coil pipes, all the coil pipes are sequentially coiled on the outer surface of the liner cylinder from bottom to top, each section of the coil pipe is communicated with a water inlet pipe and a water outlet pipe, and a heat insulation layer is filled between the outer package cylinder and the liner cylinder; a rotating shaft which is vertically arranged and can only rotate is arranged in the inner container barrel, and an asymmetric stirring blade is fixedly arranged on the rotating shaft; and a motor for driving the rotating shaft to rotate is fixedly arranged on the outer packaging barrel. The invention has excellent heat exchange performance, and the asymmetric stirring blade does not generate vortex effect when stirring milk.
Description
Technical Field
The invention belongs to the technical field of milk processing equipment, and particularly relates to a milk fermentation tank with excellent heat exchange performance.
Background
In the process of processing the milk beverage, a fermentation process is usually performed, and in the process of fermenting the raw material of the milk, a fermentation tank for producing the milk beverage is usually adopted for fermentation. The existing fermentation tank adopts a mode of one coil pipe for one inlet and one outlet to realize heat exchange of the inner cylinder, the heat exchange performance is poor, and the temperature in the fermentation tank is difficult to control in time. Meanwhile, the stirring device in the conventional fermentation tank is generally arranged at the central position of the fermentation tank, and the stirring device is easy to generate vortex effect when stirring the milk in the fermentation tank, can bring a large amount of bow-shaped materials into the milk, influences the milk fermentation quality, obviously reduces the power consumption of the stirrer and enables the stirring blades to be partially exposed out of the liquid level. If the stirring device is eccentrically arranged, the stirring efficiency is affected.
Disclosure of Invention
The invention provides the milk fermentation tank with excellent heat exchange performance, aiming at the defects that the milk fermentation tank in the prior art has poor heat exchange performance and is easy to generate vortex effect.
The invention aims to be realized by the following technical scheme: a milk fermentation tank with excellent heat exchange performance comprises an outer packaging barrel and an inner container barrel arranged in the outer packaging barrel, wherein a feeding hole and a discharging hole are formed in the inner container barrel, a plurality of sections of mutually independent coil pipes are coiled on the outer surface of the inner container barrel, all the coil pipes are sequentially coiled on the outer surface of the inner container barrel from bottom to top, each section of coil pipe is communicated with a water inlet pipe and a water outlet pipe, the water inlet pipe is located at the lowest end of each coil pipe, and the water outlet pipe is located at the highest end of each coil pipe; the outer ends of the water inlet pipe and the water outlet pipe extend out of the outer side of the outer package cylinder, and a heat insulation layer is filled between the outer package cylinder and the inner container cylinder; a rotating shaft which is vertically arranged and can only rotate is arranged in the inner container barrel, and an asymmetric stirring blade is fixedly arranged on the rotating shaft; the asymmetric stirring blades comprise two sub-blades which are respectively positioned at two sides of the rotating shaft, each sub-blade comprises a vertical stirring plate which is vertically arranged, the bottom of the vertical stirring plate is fixedly provided with a transverse stirring plate which is used for stirring the bottom of the liner cylinder, at least two transverse stirring rods which are fixedly connected with the rotating shaft are also vertically arranged on the vertical stirring rod, and the transverse stirring rods on the two sub-blades are sequentially arranged in a staggered manner; and a motor for driving the rotating shaft to rotate is fixedly arranged on the outer packaging barrel.
In the above scheme, can realize that the multistage formula is intake through the multistage coil pipe, can show the heat exchange efficiency who promotes the inner bag barrel. Through the asymmetric stirring vane who sets up, at the stirring in-process, certain mixed flow can be markd to the material in the fermentation cylinder, can not produce the swirl effect.
Preferably, the bottom of the inner cavity of the inner container barrel is of an inverted conical structure, a supporting seat for supporting the rotating shaft is fixedly arranged at the central position of the bottom of the inner cavity of the inner container barrel, and a bearing is arranged between the supporting seat and the rotating shaft; the lateral surface of the transverse stirring plate facing the bottom of the inner cavity of the inner container barrel is parallel to the bottom of the inner cavity of the inner container barrel. The horizontal stirring plate is arranged to be of a V-shaped structure, so that the milk at the bottom of the liner cylinder can be stirred well, and the milk in the liner cylinder can be stirred more uniformly.
Preferably, the feed inlet is located the inner bag barrel upper end, the feed inlet rigidity is equipped with the inlet pipe, and the inlet pipe upper end is located the outsourcing barrel outside, and the inlet pipe lower extreme stretches into inner bag barrel inner chamber bottom, the discharge gate is located inner bag barrel lower extreme central point and puts, and the discharge gate position is equipped with the pull rod valve. The discharge port can be controlled to be opened or closed through the pull rod valve, and the discharge can be controlled.
Preferably, the coil pipe positioned at the lowest end is coiled around the discharge hole from the lower end surface of the liner cylinder body; the heights of the inner container barrels coiled by the coil pipes at each section are equal. The coil pipe located at the lowermost end can wrap most of the lower end face of the inner container barrel, and the heat exchange performance of the inner container barrel can be improved.
Preferably, the coil is in three sections. The three sections of the coils can achieve excellent heat exchange efficiency, the utilization rate of heat exchange media in the coils is high, when the number of the coils is one section or two sections, the heat exchange efficiency is low, and when the number of the coils is larger than three sections, the heat exchange efficiency can be better achieved, but the utilization rate of the heat exchange media in the coils is low. When the number of the coil pipes is three, the comprehensive performance is optimal.
Preferably, the inner container barrel is further provided with a ventilation cap, and the outer end of the ventilation cap is located on the outer side of the outer packaging barrel.
Preferably, the outsourcing barrel is provided with a quick-opening manhole and a cleaning opening which are communicated with the liner barrel, and the cleaning opening is detachably connected with a sealing cover.
Preferably, the inner container barrel is further provided with a lamp hole sight glass, and the outer package barrel is provided with a first notch at a position corresponding to the lamp hole sight glass.
Preferably, the inner container barrel is also provided with a sampling valve and a digital display thermometer for detecting the temperature of the inner cavity of the inner container barrel; and a second notch is arranged at the position, corresponding to the sampling valve and the digital display thermometer, on the outer packaging barrel body. The milk in the inner container cylinder can be sampled through the sampling valve. The thermometer can penetrate the temperature in the inner container barrel through digital display.
Preferably, the lower end of the outer packaging cylinder body is fixedly connected with a plurality of supporting columns.
Compared with the prior art, the invention has the following beneficial effects: the invention can greatly improve the heat exchange efficiency in the liner cylinder by arranging the multi-section coil pipes, and the asymmetric blades can not generate vortex effect during stirring.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of the present invention;
the labels in the figure are: 1. the outer package barrel, 2, the inner bag barrel, 3, the feed inlet, 4, the discharge gate, 5, the inlet pipe, 6, the pull rod valve, 7, the coil pipe, 8, the inlet tube, 9, the outlet pipe, 10, the heat preservation, 11, the pivot, 12, the supporting seat, 13, the sub-blade, 14, vertical stirring board, 15, horizontal stirring board, 16, horizontal stirring rod, 17, the motor, 18, the quick-open manhole, 19, the washing mouth, 20, the lamp hole sight glass, 21, first breach, 22, the sample valve, 23, the digital display thermometer, 24, the second breach, 25, the support column, 26, ventilative cap.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which:
example 1
As shown in fig. 1 and 2, the milk fermentation tank with excellent heat exchange performance comprises an outer package barrel body 1 and a liner barrel body 2 arranged in the outer package barrel body 1, wherein a feed inlet 3 and a discharge outlet 4 are formed in the liner barrel body 2, the feed inlet 3 is positioned at the upper end of the liner barrel body 2, a feed pipe 5 is fixedly arranged at the feed inlet 3, the upper end of the feed pipe 5 is positioned at the outer side of the outer package barrel body 1, and the lower end of the feed pipe 5 extends into the bottom of an inner cavity of the liner barrel body 2. The discharge port 4 is positioned at the center of the lower end of the liner cylinder 2, and a pull rod valve 6 is arranged at the discharge port 4. Three sections of independent coil pipes 7 are coiled on the outer surface of the inner container barrel 2, the three sections of coil pipes 7 are sequentially coiled on the outer surface of the inner container barrel 2 from bottom to top, and the coil pipe 7 at the lowest end is coiled around the discharge port 4 from the lower end surface of the inner container barrel 2; the height of the inner container barrel 2 coiled by each section of coil pipe 7 is equal, each section of coil pipe 7 is communicated with a water inlet pipe 8 and a water outlet pipe 9, the water inlet pipe 8 is positioned at the lowest end of the coil pipe 7, and the water outlet pipe 9 is positioned at the highest end of the coil pipe 7; the outer ends of the water inlet pipe 8 and the water outlet pipe 9 extend out of the outer side of the outer packaging barrel body 1, and a heat insulation layer 10 is filled between the outer packaging barrel body 1 and the inner container barrel body 2.
The bottom of the inner cavity of the inner container barrel 2 is of an inverted conical structure, a rotating shaft 11 which is vertically arranged and can only rotate is arranged in the inner container barrel 2, a supporting seat 12 used for supporting the rotating shaft 11 is fixedly arranged at the central position of the bottom of the inner cavity of the inner container barrel 2, and a bearing is arranged between the supporting seat 12 and the rotating shaft 11. An asymmetric stirring blade is fixedly arranged on the rotating shaft 11; asymmetric stirring vane includes that two are located the sub-blade 13 of 11 both sides of pivot respectively, and each sub-blade 13 all includes the vertical stirring board 14 of a vertical setting, and vertical stirring board 14 bottom is fixed to be equipped with the horizontal stirring board 15 that is used for stirring 2 bottoms of inner bag barrel, horizontal stirring board 15 is the V-arrangement structure, and just horizontal stirring board 15 is parallel with 2 inner bag barrel bottoms of inner bag barrel towards the side of 2 inner chamber bottoms of inner bag barrel. Two transverse stirring rods 16 fixedly connected with the rotating shaft 11 are vertically arranged on the vertical stirring rod of one sub-blade 13, three transverse stirring rods 16 fixedly connected with the rotating shaft 11 are vertically arranged on the vertical stirring rod of the other sub-blade 13, and the transverse stirring rods 16 on the two sub-blades 13 are sequentially arranged in a staggered manner; and a motor 17 for driving the rotating shaft 11 to rotate is also fixedly arranged on the outer packaging cylinder body 1.
The outer-wrapping cylinder body 1 is provided with a quick-opening manhole 18 and a cleaning opening 19 which are communicated with the inner container cylinder body 2, and the cleaning opening 19 is detachably connected with a sealing cover. The inner container barrel 2 is further provided with a lamp hole sight glass 20, and the outer package barrel 1 is provided with a first notch 21 at a position corresponding to the lamp hole sight glass 20. The inner container barrel 2 is also provided with a sampling valve 22 and a digital display thermometer 23 for detecting the temperature of the inner cavity of the inner container barrel 2; and a second notch 24 is arranged at the position, corresponding to the sampling valve 22 and the digital display thermometer 23, on the outer packaging cylinder body 1. The lower end of the outer packaging barrel body 1 is fixedly connected with four support columns 25. The inner container barrel 2 is also provided with a ventilation cap 26, and the outer end of the ventilation cap 26 is positioned outside the outer packaging barrel 1.
The milk fermentation cylinder of this application need be at 8 position connection cold and hot water supply device of inlet tube when using, and the valves through cold and hot water supply device switches cold water or hot water and gets into coil pipe 7, and water gets into coil pipe 7 from inlet tube 8 of coil pipe 7 lower extreme, flows from the delivery port of 7 upper ends of coil pipe again, realizes the heat exchange to inner bag barrel 2, and the design of syllogic coil pipe 7 can apply to the heat exchange of fermentation cylinder together, can show the heat exchange efficiency who promotes the fermentation cylinder. Asymmetric blade's setting mainly is asymmetric setting between the horizontal puddler 16 on two sub-blades 13, for crisscross setting, like this when asymmetric blade stirs in to the fermentation vat, horizontal puddler 16 can make the turbulent flow of stirring to the milk in the fermentation vat, avoids the production of vortex effect, and the swirl form fluid of more symmetrical formula stirring, the turbulent flow can be better play the effect of heat exchange.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. A milk fermentation tank with excellent heat exchange performance is characterized by comprising an outer packaging barrel body and an inner container barrel body arranged in the outer packaging barrel body, wherein a feeding hole and a discharging hole are formed in the inner container barrel body; the outer ends of the water inlet pipe and the water outlet pipe extend out of the outer side of the outer package cylinder, and a heat insulation layer is filled between the outer package cylinder and the inner container cylinder; a rotating shaft which is vertically arranged and can only rotate is arranged in the inner container barrel, and an asymmetric stirring blade is fixedly arranged on the rotating shaft; the asymmetric stirring blades comprise two sub-blades which are respectively positioned at two sides of the rotating shaft, each sub-blade comprises a vertical stirring plate which is vertically arranged, the bottom of the vertical stirring plate is fixedly provided with a transverse stirring plate which is used for stirring the bottom of the liner cylinder, at least two transverse stirring rods which are fixedly connected with the rotating shaft are also vertically arranged on the vertical stirring rod, and the transverse stirring rods on the two sub-blades are sequentially arranged in a staggered manner; and a motor for driving the rotating shaft to rotate is fixedly arranged on the outer packaging barrel.
2. The milk fermentation tank with excellent heat exchange performance of claim 1, wherein the bottom of the inner cavity of the inner container barrel is of an inverted conical structure, a support seat for supporting the rotating shaft is fixedly arranged at the center of the bottom of the inner cavity of the inner container barrel, and a bearing is arranged between the support seat and the rotating shaft; the lateral surface of the transverse stirring plate facing the bottom of the inner cavity of the inner container barrel is parallel to the bottom of the inner cavity of the inner container barrel.
3. The milk fermentation tank with excellent heat exchange performance of claim 2, wherein the feeding port is located at the upper end of the inner container barrel, the feeding port is fixedly provided with a feeding pipe, the upper end of the feeding pipe is located outside the outer bag barrel, the lower end of the feeding pipe extends into the bottom of the inner cavity of the inner container barrel, the discharging port is located at the center of the lower end of the inner container barrel, and the discharging port is provided with a pull rod valve.
4. The milk fermentation tank with excellent heat exchange performance of claim 3, wherein the coil pipe at the lowest end is coiled around the discharge port from the lower end face of the inner container barrel; the heights of the inner container barrels coiled by the coil pipes at each section are equal.
5. The milk fermentation tank with excellent heat exchange performance of claim 4, wherein the coil is three-sectioned.
6. The milk fermentation tank with excellent heat exchange performance of claim 4, wherein the inner container cylinder is further provided with a ventilation cap, and the outer end of the ventilation cap is positioned outside the outer packaging cylinder.
7. The milk fermentation tank with excellent heat exchange performance of claim 1, wherein the outer package cylinder is provided with a quick-opening manhole and a cleaning opening which are communicated with the inner container cylinder, and the cleaning opening is detachably connected with a sealing cover.
8. The milk fermentation tank with excellent heat exchange performance as claimed in claim 1, wherein the inner container barrel is further provided with a lamp hole sight glass, and the outer casing barrel is provided with a first notch at a position corresponding to the lamp hole sight glass.
9. The milk fermentation tank with excellent heat exchange performance of claim 1, wherein the inner container barrel is further provided with a sampling valve and a digital display thermometer for detecting the temperature of the inner cavity of the inner container barrel; and a second notch is arranged at the position, corresponding to the sampling valve and the digital display thermometer, on the outer packaging barrel body.
10. The milk fermentation tank with excellent heat exchange performance of claim 1, wherein a plurality of support columns are fixedly connected to the lower end of the outer cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010715721.6A CN111838312A (en) | 2020-07-23 | 2020-07-23 | Milk fermentation tank with excellent heat exchange performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010715721.6A CN111838312A (en) | 2020-07-23 | 2020-07-23 | Milk fermentation tank with excellent heat exchange performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111838312A true CN111838312A (en) | 2020-10-30 |
Family
ID=72950453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010715721.6A Pending CN111838312A (en) | 2020-07-23 | 2020-07-23 | Milk fermentation tank with excellent heat exchange performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111838312A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022016989A1 (en) * | 2020-07-23 | 2022-01-27 | 浙江李子园食品股份有限公司 | Milk fermentation tank having excellent heat exchange performance |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101712923A (en) * | 2009-09-11 | 2010-05-26 | 云南昆船设计研究院 | Organic waste dry-type anaerobic fermentation device and technology |
| CN206385160U (en) * | 2017-01-19 | 2017-08-08 | 武汉好多多生物科技有限公司 | A kind of circulation fermentation tank |
| CN207754461U (en) * | 2017-11-23 | 2018-08-24 | 山东初饮生物科技有限公司 | A kind of fermentation tank with auto temperature controlled system |
| CN208071685U (en) * | 2018-01-26 | 2018-11-09 | 上海本优机械有限公司 | A kind of novel frame type stirred fermentor |
| CN211020794U (en) * | 2019-07-31 | 2020-07-17 | 临洮康源乳品有限责任公司 | Fermentation cylinder is used in milk drink production |
| CN212232939U (en) * | 2020-07-23 | 2020-12-29 | 浙江李子园食品股份有限公司 | Milk fermentation tank with excellent heat exchange performance |
-
2020
- 2020-07-23 CN CN202010715721.6A patent/CN111838312A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101712923A (en) * | 2009-09-11 | 2010-05-26 | 云南昆船设计研究院 | Organic waste dry-type anaerobic fermentation device and technology |
| CN206385160U (en) * | 2017-01-19 | 2017-08-08 | 武汉好多多生物科技有限公司 | A kind of circulation fermentation tank |
| CN207754461U (en) * | 2017-11-23 | 2018-08-24 | 山东初饮生物科技有限公司 | A kind of fermentation tank with auto temperature controlled system |
| CN208071685U (en) * | 2018-01-26 | 2018-11-09 | 上海本优机械有限公司 | A kind of novel frame type stirred fermentor |
| CN211020794U (en) * | 2019-07-31 | 2020-07-17 | 临洮康源乳品有限责任公司 | Fermentation cylinder is used in milk drink production |
| CN212232939U (en) * | 2020-07-23 | 2020-12-29 | 浙江李子园食品股份有限公司 | Milk fermentation tank with excellent heat exchange performance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022016989A1 (en) * | 2020-07-23 | 2022-01-27 | 浙江李子园食品股份有限公司 | Milk fermentation tank having excellent heat exchange performance |
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