JP3215530U - Jet nozzle for impact-type quick refrigeration equipment - Google Patents

Abstract

[PROBLEMS] To effectively improve the uniformity of the temperature-decreasing process of frozen foods, and to improve the quality of the frozen food by improving the large difference existing in the temperature-decreasing speed of the frozen food at different positions in the food freezing process in the conventional structure. A jet nozzle for an impact-type quick refrigeration apparatus that can be improved is provided. A plurality of V-shaped guide grooves 1 arranged in parallel along the moving direction of a frozen scraper conveyor 3 and a slit nozzle 2 communicating with the lower end of the V-type guide groove 1 are provided. The type diversion groove 1 includes two long plates installed so as to be inclined to face each other, and the V type diversion groove 1 has a rectangular cross section and an inverted trapezoidal longitudinal cross section. Yes, the upper portions of two adjacent V-shaped flow guide grooves 1 are connected by a flat plate, and the slit nozzle 2 includes two elongated plates that are installed in parallel to face each other. The upper ends of the long plates are respectively connected to the lower ends of the two long plates of the V-shaped flow guide groove 1. [Selection] Figure 1

Description

The present invention relates to the technical field of food quick freezing, and more particularly to a jet nozzle for an impact-type quick freezing apparatus.

The blown quick freezer is a device commonly used in the field of quick frozen foods. Among them, the impact-type quick freezer has a high convective heat transfer coefficient. And is attracting attention by researchers. In the quick refrigeration apparatus, the fact that the air flow in the plenum chamber emits a high-speed air flow by the nozzle structure is a factor that achieves an impact effect, and the impact effect mainly depends on the structure and dimensions of the nozzle structure. The nozzle structure of the conventional impact type quick freezing apparatus is generally a plate structure with a circular hole, but such a structure has a problem that the temperature drop process of the frozen material in the freezing region is not uniform.

An object of the present invention is to provide at least an impact-type rapid freezing apparatus jet nozzle capable of improving the uniformity of the temperature lowering process of the frozen material in the freezing region.

In order to achieve the above object, the present invention provides a plurality of V-shaped guide grooves that are arranged in parallel along the direction of movement of the frozen scraper conveyor, and a slit nozzle that communicates with the lower ends of the V-type guide grooves. The V-shaped diversion groove includes two long plates installed so as to be opposed to each other, and the longitudinal direction of the long plate is a horizontal direction, and the V-shaped diversion groove is crossed. Two sheets with a rectangular surface and an inverted trapezoidal longitudinal cross-section, with the upper part of two adjacent V-shaped channel grooves connected by a flat plate, and slit nozzles installed vertically to be parallel to each other The longitudinal direction of the elongated plate is a horizontal direction, and the upper ends of the two elongated plates of the slit nozzle are the lower ends of the two elongated plates of the V-shaped guide groove, respectively. A jet nozzle for an impact-type quick refrigeration apparatus is provided. The slit nozzle is a diagonally slit nozzle that is symmetrically diagonally cut from the center point of the lower ends of the two long plates of the slit nozzle to both ends, and the cutting ratio Ψ (1 ≧ Ψ ≧ 0) is the nozzle. The ratio between the cutting height at both ends of the nozzle and the height at the center in the vertical direction of the nozzle.

In one embodiment, the slit nozzle has a length of 1000-2000 mm, a width of 3-10 mm, and a height of 20-40 mm, and a shortest vertical distance between the slit nozzle and a scraper conveyor below the slit nozzle is 10-60 mm. It is.

In one embodiment, the slit nozzle has a length of 1200 to 1800 mm, a width of 4 to 7 mm, and a height of 25 to 35 mm. The shortest vertical distance between the slit nozzle and the scraper conveyor below the slit nozzle is 20 to 50 mm. It is.

In one embodiment, the slit nozzle has a length of 1500 mm, a width of 5 mm, and a height of 30 mm, and a shortest vertical distance between the slit nozzle and a scraper conveyor below the slit nozzle is 40 mm.

In one embodiment, for Hs <10, 1> Ψ ₀ > 0, where Hs is the ratio of the distance between the slit nozzle and the scraper conveyor below it and the width of the slit nozzle, and Ψ ₀ is critical When the cutting ratio is Ψ = Ψ0, the heat exchange uniformity of the refrigeration region in the scraper conveyor of the quick refrigeration apparatus is optimal, and the distance is the shortest vertical distance between the slit nozzle and the scraper conveyor.

In one embodiment, for Hs <10, the relation between Ψ0 and Hs is Ψ ₀ = 0.001Hs ⁴ +0.0349 Hs ³ −0.4127 Hs ² +1.86989 Hs−1.9617.

In one embodiment, when Hs ≧ 10, Ψ ₀ = 0, where Hs is the ratio of the distance between the slit nozzle and the scraper conveyor below it to the width of the slit nozzle, and Ψ is the distance between the ends of the nozzle. The ratio of the cutting height to the height at the center of the nozzle in the longitudinal direction, the distance being the shortest vertical distance between the slit nozzle and the scraper conveyor.

The above technical proposal according to the present invention effectively improves the uniformity of the temperature-decreasing process of the frozen product, and improves the large difference existing in the temperature-decreasing rate of the frozen product at different positions in the food freezing process in the conventional structure, Improve the quality of frozen products.

It is a three-dimensional structure schematic diagram of the jet nozzle of the present invention. It is a front view schematic diagram of the jet nozzle of the present invention. It is a side view schematic diagram of the jet nozzle of the present invention. It is a Nu number change figure in x / s = 0 and x / s = 150 on the conditions of different cutting ratio Ψ when Hs = 2. It is a Nu number change figure in x / s = 0 and x / s = 150 on the conditions of different cutting ratio (PSI) when Hs = 4. It is a Nu number change figure in x / s = 0 and x / s = 150 under the conditions of different cutting ratio Ψ when Hs = 6. It is a Nu number change figure in x / s = 0 and x / s = 150 on conditions of different cutting ratio Ψ when Hs = 8. It is a Nu number change figure in x / s = 0 and x / s = 150 on conditions of different cutting ratio Ψ when Hs = 10. It is a Nu number change figure in x / s = 0 and x / s = 150 under the conditions of different cutting ratio Ψ when Hs = 12. It is a distribution curve figure of a critical cutting ratio.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, taking specific examples as examples.

As shown in FIGS. 1-3, the jet nozzles for impact type quick freezing apparatus of this invention are several parallelly arranged in parallel along the moving direction (direction shown by the arrow of FIG. 1) of the frozen material scraper conveyor 3. As shown in FIG. And a slit nozzle 2 communicating with the lower end of the V-type flow groove 1. The V-shaped flow guide groove 1 includes two long plates installed so as to be opposed to each other, and has a rectangular cross section and an inverted trapezoidal longitudinal cross section. The upper part of the mold flow groove 1 is connected by a flat plate. The slit nozzle 2 includes two long plates that are vertically arranged so as to be parallel to each other, and the upper ends of the two long plates of the slit nozzle 2 are two sheets of the V-shaped guide groove 1 respectively. Connected to the lower end of the long plate. The slit nozzle is a diagonally slit nozzle that is symmetrically diagonally cut from the center point of the lower ends of the two long plates of the slit nozzle to both ends, and the cutting ratio Ψ (1 ≧ Ψ ≧ 0) is the nozzle. The ratio between the cutting height at both ends of the nozzle and the height at the center in the vertical direction of the nozzle. After the low-temperature air from the evaporator is sucked in by the blower of the quick freezer, the pressure is increased and then flows out, enters the jet nozzle through the plenum chamber, is ejected from the nozzle, flows out from the nozzle outlet, and enters the evaporator to exchange heat. And then sucked in by the blower and enters the next cycle.

Compared to the conventional plate structure with a circular hole, the jet nozzle according to the present invention improves the jet impact speed on the surface of the scraper conveyor, further improves the Nu number on the conveyor surface, and is above the conveyor. Increase heat exchange in the freezing area, thereby increasing the freezing rate of the frozen material. Furthermore, the jet nozzle according to the present invention greatly improves the heat exchange uniformity in the short direction of the quick refrigeration equipment, i.e., improves the consistency of the freezing speed of the frozen material on both sides and the central position of the scraper conveyor. Furthermore, the quality uniformity of the frozen product can be improved.

Taking into account both the heat exchange effect and the energy consumption of the blower, the heat exchange uniformity of the surface of the scraper conveyor can be improved under the condition that the energy consumption of the blower is reduced as much as possible to increase the heat exchange in the freezing area. Preferably, the slit nozzle 2 has a length of 1000 to 2000 mm, a width of 3 to 10 mm, and a height of 20 to 40 mm, and the slit nozzle 2 and a frozen scraper conveyor 3 below it. Distance H (both shortest vertical distances) is 10-60 mm.

As a result of the research, the length of the slit nozzle is 1200-1800mm, the width is 4-7mm, the height is 25-35mm, and the distance H between the slit nozzle 2 and the scraper conveyor 3 of the frozen material immediately below is 20-50mm. In some cases, better effects can be obtained. Here, most preferably, the slit nozzle 2 has a length of 1500 mm, a width of 5 mm, a height of 30 mm, and a distance H between the slit nozzle 2 and the scraper conveyor 3 of the frozen material immediately below is 40 mm. When the distribution of Nu number on the surface of the scraper conveyor is large and the heat exchange uniformity on the surface of the scraper conveyor is good, the minimum blower energy consumption can be realized.

As a result of further research by the inventor, the change in the ratio Hs (Hs = H / s) between the distance H between the nozzle 2 and the scraper conveyor 3 and the width S of the nozzle affects the uniformity of the cooling process of the frozen material, In the case of Hs <10, there is a significant difference in the heat exchange strength of the surface of the scraper conveyor 3 along the direction indicated by the arrow in FIG. 3 which is the short direction of the scraper conveyor 3 (also the cross flow direction), It has been found that when Hs ≧ 10, the law of excellent uniformity of heat exchange strength at different positions on the surface of the scraper conveyor 3 is satisfied. As is apparent from FIG. 3, the cutting ratio Ψ is the ratio between the cutting height T at both ends of the nozzle and the height K at the center in the longitudinal direction of the nozzle, where Ψ = T / K.

In order to further improve the uniformity of the heat exchange strength, i.e. the uniformity of the cooling process of the frozen product, the inventor has obtained data for the data calculated for the slit nozzle 2 under different cutting ratios Ψ and different Hs conditions. Processed. FIG. 4-9 is a diagram showing the Nu number change at x / s = 0 and x / s = 150 under the conditions of different cutting ratios Ψ when Hs changes.

The cutting ratio Ψ (Ψ = T / K) is the ratio of the cutting height T at both ends of the nozzle to the height K at the longitudinal center of the nozzle, Nu is the Nusselt number, and X is the scraper conveyor The coordinate values in the short direction, the four median points are x / s = 150, and the side of the scraper conveyor is x / s = 0. As is apparent from FIG. 4-9, when Hs <10 and Ψ = 0, there is a significant difference in the heat exchange strength of the surface of the scraper conveyor in the cross flow direction, that is, when x / s = 0, the scraper The number of Nu on the surface of the conveyor is much larger than x / s = 150. When Hs <10, the difference in the heat exchange strength on the surface of the scraper conveyor gradually decreases along the cross flow direction as Ψ increases. When the critical cutting ratio ψ ₀ is exceeded, the Nu number on the surface of the steel strip at x / s = 0 becomes lower than x / s = 150. The critical cutting ratio Ψ ₀ is determined based on the fact that the Nu numbers at the two points x / s = 0 and x / s = 150 are equal. Therefore, when Ψ = Ψ0, the heat exchange uniformity on the surface of the scraper conveyor is the best. The critical cutting ratio Ψ ₀ tends to increase first and then decrease as Hs increases. When Hs ≧ 10, the critical cutting ratio Ψ ₀ is very small, and when Hs = 10, the critical cutting ratio Ψ _{When 0} = 0.03 and Hs = 12, the critical cutting ratio Ψ ₀ = 0.02, and when Ψ = 0 and Hs = 10, x / s = 0 and x / s = 150 The absolute difference in Nu number between the two points is 1.6, the percentage of the difference is less than 1%, and when ψ = 0 and Hs = 12, the two points of x / s = 0 and x / s = 150 The absolute difference of the Nu number is 11.8, the percentage of the difference is 7.5%, and the uniformity of the Nu number distribution satisfies the actual production requirements under the Ψ = 0 condition. The ratio Ψ ₀ = 0.

As shown in FIG. 10, the curve of the critical cutting ratio Ψ ₀ tends to increase first and then decrease as Hs increases, and when it is in the vicinity of Hs = 4, Ψ ₀ peaks. Ψ ₀ and Hs satisfy the relationship of Ψ ₀ = 0.001Hs ⁴ +0.0349 Hs ³ −0.4127 Hs ² +1.86989 Hs−1.9617.

As can be seen from the above, the jet nozzle for the impact-type quick refrigeration apparatus according to the present invention effectively improves the uniformity of the cooling process of the frozen material by selecting an appropriate cutting ratio Ψ according to the change in the Hs value. In the conventional structure, it is possible to improve a large difference existing in the temperature drop rate of the frozen product at different positions in the food freezing process.

The above embodiments are merely illustrative of the principle of the present invention and its effects, and do not limit the present invention. Those skilled in the art can make modifications or changes to the above embodiments without departing from the spirit and scope of the present invention. Accordingly, all equivalent modifications or variations that can be conceived by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention shall fall within the scope of the claims of the present invention.

Claims (7)

A jet nozzle for an impact-type quick freezer,
A plurality of V-shaped channel grooves arranged in parallel along the moving direction of the frozen scraper conveyor and a slit nozzle communicating with the lower end of the V-shaped channel groove;
The V-shaped diversion groove includes two long plates installed so as to be inclined to face each other, the longitudinal direction of the long plate is a horizontal direction, and the cross-section of the V-type diversion groove is rectangular. , The longitudinal section in the short direction is an inverted trapezoid, and the upper part of two adjacent V-shaped groove is connected by a flat plate,
The slit nozzle includes two long plates installed vertically so as to be parallel to each other, and the longitudinal direction of the long plate is a horizontal direction, and the upper ends of the two long plates of the slit nozzle Are respectively connected to the lower ends of the two long plates of the V-shaped groove,
The slit nozzle is a diagonally slit nozzle that is symmetrically diagonally cut from the center point of the lower ends of the two long plates of the slit nozzle to both ends, and the cutting ratio Ψ (1 ≧ Ψ ≧ 0) is the nozzle. A jet nozzle for an impact-type quick refrigeration apparatus, characterized in that the ratio is the ratio of the cutting height at both ends of the nozzle to the height at the center in the longitudinal direction of the nozzle. The slit nozzle has a length of 1000-2000 mm, a width of 3-10 mm, and a height of 20-40 mm.
2. The jet nozzle for an impact-type rapid freezing apparatus according to claim 1, wherein the shortest vertical distance between the slit nozzle and the scraper conveyor below the slit nozzle is 10-60 mm. The slit nozzle has a length of 1200 to 1800 mm, a width of 4 to 7 mm, and a height of 25 to 35 mm.
The jet nozzle for an impact-type rapid freezing apparatus according to claim 2, wherein a distance between the slit nozzle and a scraper conveyor located below the slit nozzle is 20-50 mm. The impact type according to claim 3, wherein the slit nozzle has a length of 1500 mm, a width of 5 mm, and a height of 30 mm, and a distance between the slit nozzle and a scraper conveyor below the slit nozzle is 40 mm. Jet nozzle for quick refrigeration equipment. For Hs <10, 1> Ψ ₀ > 0, where Hs is the ratio of the distance between the slit nozzle and the scraper conveyor below it and the width of the slit nozzle, and Ψ ₀ is the critical cutting ratio,
2. The heat exchange uniformity of the refrigeration region in the scraper conveyor of the quick refrigeration apparatus is optimal when Ψ = Ψ ₀ , and the distance is the shortest vertical distance between the slit nozzle and the scraper conveyor. A jet nozzle for impact-type rapid refrigeration equipment described in 1. 6. When Hs <10, the relational expression of Ψ ₀ and Hs is Ψ ₀ = 0.001Hs ⁴ +0.0349 Hs ³ −0.4127 Hs ² +1.86989 Hs−1.9617, A jet nozzle for impact-type rapid refrigeration equipment described in 1. When Hs ≧ 10, ψ ₀ = 0, where Hs is the ratio of the distance between the slit nozzle and the scraper conveyor below it and the width of the slit nozzle, and ψ is the cutting height at both ends of the nozzle and the nozzle The jet nozzle for an impact-type rapid freezing apparatus according to claim 1, wherein the jet nozzle for impact type quick refrigeration apparatus according to claim 1, wherein the jet nozzle is a ratio to a height at a center in a vertical direction, and the distance is a shortest vertical distance between a slit nozzle and a scraper conveyor.

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