WO2019104786A1 - 一种细长条漏斗状射流喷嘴结构 - Google Patents

一种细长条漏斗状射流喷嘴结构 Download PDF

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Publication number
WO2019104786A1
WO2019104786A1 PCT/CN2017/117616 CN2017117616W WO2019104786A1 WO 2019104786 A1 WO2019104786 A1 WO 2019104786A1 CN 2017117616 W CN2017117616 W CN 2017117616W WO 2019104786 A1 WO2019104786 A1 WO 2019104786A1
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Prior art keywords
elongated
jet nozzle
strip
shaped
shaped guide
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PCT/CN2017/117616
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English (en)
French (fr)
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谢晶
柳雨嫣
王金峰
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上海海洋大学
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Priority to JP2018562579A priority Critical patent/JP2020511622A/ja
Priority to EP17910495.5A priority patent/EP3513661B1/en
Priority to US16/207,019 priority patent/US10602760B2/en
Publication of WO2019104786A1 publication Critical patent/WO2019104786A1/zh

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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/36—Freezing; Subsequent thawing; Cooling
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/36—Freezing; Subsequent thawing; Cooling
    • A23L3/361—Freezing; Subsequent thawing; Cooling the materials being transported through or in the apparatus, with or without shaping, e.g. in form of powder, granules, or flakes
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/001—Details of apparatus, e.g. for transport, for loading or unloading manipulation, pressure feed valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/048—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like having a flow conduit with, immediately behind the outlet orifice, an elongated cross section, e.g. of oval or elliptic form, of which the major axis is perpendicular to the plane of the jet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D13/00—Stationary devices, e.g. cold-rooms
    • F25D13/06—Stationary devices, e.g. cold-rooms with conveyors carrying articles to be cooled through the cooling space
    • F25D13/067—Stationary devices, e.g. cold-rooms with conveyors carrying articles to be cooled through the cooling space with circulation of gaseous cooling fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D25/00—Charging, supporting, and discharging the articles to be cooled
    • F25D25/04—Charging, supporting, and discharging the articles to be cooled by conveyors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • F25D3/11—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air with conveyors carrying articles to be cooled through the cooling space
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/005—Nozzles or other outlets specially adapted for discharging one or more gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/30—Quick freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2500/00—Problems to be solved
    • F25D2500/02—Geometry problems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
    • Y02P60/85—Food storage or conservation, e.g. cooling or drying

Definitions

  • the invention belongs to the field of quick-frozen food machinery and relates to a slender funnel-shaped jet nozzle structure.
  • the blasting quick-freezing machine is a common equipment in the field of quick-frozen food processing.
  • the impact chiller has become a closely watched object of the quick-freezing machine manufacturer and scientific researcher with its high convective heat transfer coefficient.
  • the airflow in the static pressure box of the quick-freezer releases the high-speed airflow through the nozzle structure, which is the key to achieve the impact effect, and the impact effect depends largely on the structure and size of the nozzle structure.
  • the nozzle structure of the existing impact type quick-freezing machine is mostly a circular perforated plate structure. However, such a structure has a problem that the freezing rate of the frozen product in the frozen region is low and the uniformity of the cooling process is low.
  • the present invention provides an elongated strip funnel-shaped jet nozzle structure comprising an elongated strip-shaped guide trough, an elongated jet nozzle, and a conveyor belt;
  • the elongated strip funnel-shaped nozzle is characterized by: slender The stripe conical flow channel (1), the elongated jet nozzle (2) and the conveyor strip (3) have a thickness of 1-5 mm;
  • the elongated strip-shaped guide channel (1) is a hollow inverted elongated elliptical truncated cone shape including an upper end opening and a lower end opening, and the upper end opening of the guiding trough is connected with the elongated elliptical opening, and the lower end opening of the guiding trough is open Connecting the inlet of the nozzle, the nozzle is a hollow elongated elliptical cylinder;
  • the length of the outlet section of the elongated jet nozzle (2) is 15-20 mm, the diameter of the semicircles on both sides is 4-6 mm, and the height is 20-40 mm; the conveyor belt (3) is located directly below the elongated jet nozzle (2) and is conveyed The distance between the strip (3) and the elongated jet nozzle (2) is 20-40 mm.
  • the elongate strip conical flow channel (1), the elongated jet nozzle (2), and the transfer strip (3) have a thickness of 1-3 mm.
  • the elongated strip-shaped guide channels (1) are arranged in a linear arrangement, and the spacing between two adjacent elongated strip-shaped guide channels (1) is 75-85 mm.
  • the upper end of the elongated strip-shaped guide channel (1) has a length of 57 mm, a semicircle on both sides having a diameter of 45 mm and a height of 40 mm.
  • the elongate jet nozzle (2) has a cross section of 17 mm in length and a semicircle on both sides having a diameter of 5 mm and a height of 30 mm.
  • the distance between the conveyor belt (3) and the elongated jet nozzle (2) is 30 mm.
  • FIG. 1 is a three-dimensional view showing the structure of a sliver funnel-shaped jet nozzle of the present invention.
  • Figure 2 is a plan view showing the structure of a sliver funnel-shaped jet nozzle of the present invention.
  • Figure 3 is a front elevational view of a sliver funnel nozzle of the present invention.
  • the elongated strip-shaped guide channel (1) is a hollow inverted elongated elliptical truncated cone shape including an upper end opening and a lower end opening, and the upper end opening of the guiding trough is connected with the elongated elliptical opening, and the lower end opening of the guiding trough is open Connecting the inlet of the nozzle, the nozzle is a hollow elongated elliptical cylinder;
  • the elongated strip-shaped guide channels (1) are arranged in a linear arrangement, and the spacing between two adjacent elongated strip-shaped guide channels (1) is 70-90 mm; the elongated strip-shaped guide channels ( 1) The upper end opening has a length of 55-60 mm, the semicircles on both sides have a diameter of 40-50 mm, and the height is 30-50 mm; the spacing of the two adjacent elongated strip-shaped guide channels (1) is two The distance between the geometric centers of the elongated elliptical holes;
  • the length of the outlet section of the elongated jet nozzle (2) is 15-20 mm, the diameter of the semicircles on both sides is 4-6 mm, and the height is 20-40 mm; the conveyor belt (3) is located directly below the elongated jet nozzle (2) and is conveyed The distance between the strip (3) and the elongated jet nozzle (2) is 20-40 mm.
  • the low-temperature air from the evaporator is sucked by the fan of the quick-freezer and then boosted and flows out. After passing through the static pressure tank, it enters the jet nozzle. After being sprayed through the nozzle, it flows out from the outlet of the nozzle structure into the evaporator for heat exchange, and then is again sucked into the fan. The next cycle.
  • the above-mentioned jet nozzle structure provided by the invention can greatly improve the heat exchange intensity of the surface of the conveyor belt, increase the freezing rate of the frozen product, and at the same time, the speed of the nozzle outlet is large.
  • the improvement of the flow in the frozen area improves the uniformity of the cooling process of the frozen product, thus improving the quality of the frozen product.
  • the size of the orifice plate is 600*600*2mm, and the numerical simulation of the sliver funnel-shaped nozzle is carried out.
  • the orifice plate with the elongated elliptical opening is selected as a comparison.
  • Structure as a comparison.
  • the simulated fluid is air, and the following assumptions are made: 1 Air is an incompressible fluid 2 Model During normal operation, the internal flow field is considered to be a steady state 3 static pressure tank wall is considered to be adiabatic. This model uses the k- ⁇ turbulence model, and the energy equation is turned on due to temperature changes during the impact process.
  • the inlet temperature is set to 230K and the outlet temperature is 235K.
  • the conveyor belt was treated as a conveyor belt with a thermal conductivity of 16.3 W/(m* °C).
  • the thickness of the elongated strip-shaped guide groove 1, the elongated jet nozzle 2 and the transfer strip 3 is 2 mm; the elongated strip-shaped guide grooves 1 are arranged in a linear arrangement and two adjacent The distance between the elongated strip-shaped guide channels 1 is 80 mm; the length of the upper end of the elongated strip-shaped guide trough 1 is 57 mm, the diameter of the semi-circles on both sides is 45 mm, and the height is 40 mm; the exit section of the elongated jet nozzle 2 The length is 17 mm, the semicircles on both sides are 5 mm in diameter and 30 mm in height; the transfer strip 3 is located directly below the elongated jet nozzle 2, and the distance between the transfer strip 3 and the elongated jet nozzle 2 is 30 mm.
  • the simulation results show that the average Nusselt number of the surface of the conveyor belt under the sliver funnel-shaped nozzle structure is 159.89, and the thinning on the traditional perforated flat plate is the same when the nozzle outlet area is the same.
  • the average Nusselt number under the long nozzle is 146.06. It can be seen that the average Nu number of heat transfer in the novel slender funnel nozzle structure is increased by about 9.47%, and the uniformity of the Nu number distribution is better.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Nutrition Science (AREA)
  • Food Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

一种细长条漏斗状射流喷嘴结构，包括细长条锥形导流槽(1)、细长射流喷嘴(2)、传送板带(3)，所述细长条锥形导流槽(1)、所述细长射流喷嘴(2)和所述传送板带(3)的厚度为1-5mm，所述细长条锥形导流槽(1)为包括上端开口和下端开口的中空倒细长椭圆锥台形，所述上端开口与细长椭圆形开孔连接，所述下端开口连接喷嘴的入口，喷嘴为中空细长椭圆柱形。该喷嘴结构可以有效提高冻结区域的换热强度，提高速冻机的冻结效率，有效改善传统喷嘴结构不能同时兼顾较高冻结效率和换热不均匀的缺陷。

Description

一种细长条漏斗状射流喷嘴结构 技术领域
本发明属于速冻食品机械领域，涉及一种细长条漏斗状射流喷嘴结构。
背景技术
鼓风速冻机是速冻食品加工领域的常用设备，其中的冲击式速冻机以其较高的对流换热系数越来越成为速冻机制造厂家及科研工作者密切关注的对象。速冻机静压箱内的气流通过喷嘴结构释放出高速气流是实现冲击效果的关键，而冲击效果在很大程度上取决于喷嘴结构的结构与尺寸。现有冲击式速冻机的喷嘴结构多为圆形开孔板式结构，然而此种结构存在冻结区域冻品冻结速率低和降温过程均匀性较低的问题。
发明内容
本发明的目的至少在于提供一种能够提高冻结区域冻品冻结速率低和降温过程均匀性的冲击式速冻机射流喷嘴结构。
为实现上述目，本发明提供了一种细长条漏斗状射流喷嘴结构包括细长条锥形导流槽、细长射流喷嘴、传送板带；细长条漏斗状喷嘴结构特征在于：细长条锥形导流槽(1)、细长射流喷嘴(2)和传送板带(3)的厚度为1-5mm；
所述细长条锥形导流槽(1)为包括上端开口和下端开口的中空倒细长椭圆锥台形，导流槽的上端开口与细长椭圆形开孔连接，导流槽的下端开口连接喷嘴的入口，喷嘴为中空细长椭圆柱形；
细长条锥形导流槽(1)排列方式为线性排列，且两个相邻的细长条锥形导流槽(1)的间距为70-90mm；细长条锥形导流槽(1)上端开口的长度为55-60mm，两侧半圆直径为40-50mm，高度为30-50mm；所述的两个相邻的细长条锥形导流槽(1)的间距为两个细长椭圆形孔几何中心之间的距离；
细长射流喷嘴(2)出口截面的长度为15-20mm，两侧半圆直径为4-6mm，高度为20-40mm；传送板带(3)位于细长射流喷嘴(2)正下方，且传送板带(3)与细长射流喷嘴(2)之间的距离为20-40mm。
在一个实施方式中，细长条锥形导流槽(1)、细长射流喷嘴(2)和传送板带(3)的厚度为1-3mm。
在一个实施方式中，细长条锥形导流槽(1)、细长射流喷嘴(2)和传送板带(3)的 厚度为2mm。
在一个实施方式中，细长条锥形导流槽(1)排列方式为线性排列，且两个相邻的细长条锥形导流槽(1)的间距为75-85mm。
在一个实施方式中，两个相邻的细长条锥形导流槽(1)的间距为80mm。
在一个实施方式中，细长条锥形导流槽(1)上端开口的长度为57mm，两侧半圆直径为45mm，高度为40mm。
在一个实施方式中，细长射流喷嘴(2)出口截面的长度为17mm，两侧半圆直径为5mm，高度为30mm。
在一个实施方式中，传送板带(3)与细长射流喷嘴(2)之间的距离为30mm。
本发明提供的上述技术方案可以有效地提高冻品的冻结速率和改善冻品降温过程的均匀性，改善传统结构在食品冷冻加工过程中不同位置处冻品降温速率存在的较大差异性，提高冻品质量。
附图说明
图1是本发明一种细长条漏斗状射流喷嘴结构三维示意图。
图2是本发明一种细长条漏斗状射流喷嘴结构俯视图。
图3是本发明一种细长条漏斗状喷嘴结主视图。
图1中，1、细长条锥形导流槽；2、细长射流喷嘴；3、传送板带；
具体实施方式
为使本发明实现的操作流程与创作特征易于明白了解，下面结合具体实施方式，进一步阐述本发明。
细长条漏斗状射流喷嘴包括细长条锥形导流槽1、细长射流喷嘴2、传送板带3；细长条漏斗状喷嘴结构特征在于：细长条锥形导流槽(1)、细长射流喷嘴(2)和传送板带(3)的厚度为1-5mm；
所述细长条锥形导流槽(1)为包括上端开口和下端开口的中空倒细长椭圆锥台形，导流槽的上端开口与细长椭圆形开孔连接，导流槽的下端开口连接喷嘴的入口，喷嘴为中空细长椭圆柱形；
细长条锥形导流槽(1)排列方式为线性排列，且两个相邻的细长条锥形导流槽(1)的间距为70-90mm；细长条锥形导流槽(1)上端开口的长度为55-60mm，两侧半圆直径为40-50mm，高度为30-50mm；所述的两个相邻的细长条锥形导流槽(1)的间距为两个细长椭圆形孔几何中心之间的距离；
细长射流喷嘴(2)出口截面的长度为15-20mm，两侧半圆直径为4-6mm，高度为20-40mm；传送板带(3)位于细长射流喷嘴(2)正下方，且传送板带(3)与细长射流喷嘴(2)之间的距离为20-40mm。
来自蒸发器的低温空气被速冻机的风机吸入后升压流出，经过静压箱后进入射流喷嘴，在经过喷嘴喷射后从喷嘴结构的出口流出进入蒸发器进行换热，然后再次被风机吸入进入下一个循环。
和传统的圆形开孔板式结构相比较，采用本发明提供的上述射流喷嘴结构，能够大幅提高传送板带表面的换热强度，提高冻品的冻结速率，同时由于喷嘴出口的速度有很大的提高，改善了冻结区域内的流动，从而改善了冻品降温过程的均匀性，因此提高了冻品质量。
以速冻机静压箱尺寸为600*600*600mm为例，孔板尺寸为600*600*2mm，对细长条漏斗状喷嘴进行了数值模拟，作为对比选择了细长椭圆开孔的孔板结构作为对比。模拟的流体为空气，进行了下列假设：①空气为不可压缩流体②模型在正常运行过程中，内部的流场视为稳态③静压箱壁面视为绝热。本模型采用k—ε湍流模型，由于在冲击过程中有温度的变化，故开启能量方程。压力入口边界条件为Pin＝250Pa，压力出口边界条件Pout＝0Pa。对于冻结区域，入口温度设置为230K，出口温度为235K。传送带作为传送板带处理，其热导率为16.3W/(m*℃)。
通过数值模拟优选，细长条锥形导流槽1、细长射流喷嘴2和传送板带3的厚度为2mm；细长条锥形导流槽1排列方式为线性排列，且两个相邻的细长条锥形导流槽1的间距为80mm；细长条锥形导流槽1上端开口的长度为57mm，两侧半圆直径为45mm，高度为40mm；细长射流喷嘴2出口截面的长度为17mm，两侧半圆直径为5mm，高度为30mm；传送板带3位于细长射流喷嘴2正下方，且传送板带3和细长射流喷嘴2之间的距离为30mm。
通过对速冻机冻结区域进行数值模拟，模拟结果表明：在喷嘴出口面积相同的情况下，细长条漏斗状喷嘴结构下传送板带表面平均努塞尔数为159.89，传统开孔平板上的细长条喷嘴下平均努塞尔数为146.06，可以看出这种新型细长条漏斗状喷嘴结构下换热的平均Nu数约提高了9.47％，同时Nu数分布的均匀性更好。
上述实施例仅例示性说明本发明的原理及其功效，而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由本发明的权利要求所涵盖。

Claims (8)

  1. 一种细长条漏斗状射流喷嘴结构包括细长条锥形导流槽、细长射流喷嘴、传送板带；细长条漏斗状喷嘴结构特征在于：细长条锥形导流槽(1)、细长射流喷嘴(2)和传送板带(3)的厚度为1-5mm；
    所述细长条锥形导流槽(1)为包括上端开口和下端开口的中空倒细长椭圆锥台形，导流槽的上端开口与细长椭圆形开孔连接，导流槽的下端开口连接喷嘴的入口，喷嘴为中空细长椭圆柱形；
    细长条锥形导流槽(1)排列方式为线性排列，且两个相邻的细长条锥形导流槽(1)的间距为70-90mm；细长条锥形导流槽(1)上端开口的长度为55-60mm，两侧半圆直径为40-50mm，高度为30-50mm；所述的两个相邻的细长条锥形导流槽(1)的间距为两个细长椭圆形孔几何中心之间的距离；
    细长射流喷嘴(2)出口截面的长度为15-20mm，两侧半圆直径为4-6mm，高度为20-40mm；传送板带(3)位于细长射流喷嘴(2)正下方，且传送板带(3)与细长射流喷嘴(2)之间的距离为20-40mm。
  2. 如权利要求1所述的一种细长条漏斗状射流喷嘴结构，其特征在于：
    细长条锥形导流槽(1)、细长射流喷嘴(2)和传送板带(3)的厚度为1-3mm。
  3. 如权利要求1所述的一种细长条漏斗状射流喷嘴结构，其特征在于：细长条锥形导流槽(1)、细长射流喷嘴(2)和传送板带(3)的厚度为2mm。
  4. 如权利要求1所述的一种细长条漏斗状射流喷嘴结构，其特征在于：
    细长条锥形导流槽(1)排列方式为线性排列，且两个相邻的细长条锥形导流槽(1)的间距为75-85mm。
  5. 如权利要求4所述的一种细长条漏斗状射流喷嘴结构，其特征在于：
    两个相邻的细长条锥形导流槽(1)的间距为80mm。
  6. 如权利要求1所述的一种细长条漏斗状射流喷嘴结构，其特征在于：
    细长条锥形导流槽(1)上端开口的长度为57mm，两侧半圆直径为45mm，高度为40mm。
  7. 如权利要求1所述的一种细长条漏斗状射流喷嘴结构，其特征在于：细长射流喷嘴(2)出口截面的长度为17mm，两侧半圆直径为5mm，高度为30mm。
  8. 如权利要求1所述的一种细长条漏斗状射流喷嘴结构，其特征在于：传送板带(3)与细长射流喷嘴(2)之间的距离为30mm。
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