CN106403463A - A New Orifice Plate of Blast Freezer - Google Patents

Abstract

A new orifice plate for a blast type quick-freezing machine, including the arc surface of the first orifice plate, the arc surface of the second orifice plate, and the opening of the orifice plate. The orifice plate is formed by alternately connecting the arc surface of the orifice plate and the straight orifice plate surface. The invention effectively increases the convection coefficient between the side of the quick-frozen food and the cold air, reduces the freezing time of the food, better improves the single-direction impact problem of the traditional flat orifice plate, and provides a new method for the study of improving the freezing rate of the quick-freezing machine. train of thought.

Description

A New Orifice Plate of Blast Freezer

technical field

The invention belongs to the technical field of quick-frozen food, relates to a novel orifice plate of a blast type quick-freezing machine, and in particular relates to an orifice structure for improving the freezing efficiency of the quick-freezing machine.

Background technique

As a device to improve the uniformity of the cold air jet of the quick-freezing machine, the orifice plate of the quick-freezing machine has been widely used in the food industry in recent years, but there has not been much breakthrough in the research and design of the orifice plate itself. The air hole plate is generally a flat plate surface. During the operation of the impact type quick-freezer, the cooled food is only impacted by cold air in one direction, resulting in a low convective heat transfer coefficient on the side of the food, which increases the freezing time and affects the freezing rate of the food. The operating efficiency of the quick freezer. At present, the structure of the orifice plate of the quick-freezing machine is basically a flat plate surface, and its structure is simple. Therefore, related research is rarely involved; changing the shape of the opening is a commonly used method at present, but changing the shape of the opening has no effect on the quick-freezing effect of the quick-freezing machine. Improved significantly.

Contents of the invention

Aiming at the defect of the orifice plate structure of the existing quick-freezing machine, the present invention proposes a novel blast-type quick-freezing machine orifice plate.

The technical solution of the invention includes designing a new orifice plate of the quick-freezing machine, increasing the blasting area of the side of the frozen food by the cold air, improving the freezing efficiency of the quick-freezing machine and the like. The specific technical solutions are:

The orifice plate of the blast type quick-freezing machine includes the surface of the blowing orifice plate, the arc surface of the orifice plate, and the opening of the orifice plate; The surface of the orifice plate; the arc surface of the orifice plate is a circular arc surface with a radius R, and the included angle of the arc surface is 45°; the chord surface of the arc surface of the orifice plate is on the same plane as the surface of the positive blowing orifice plate; the opening radius of the orifice plate is 4-6mm, the hole spacing along the direction of the groove is 30-50mm; three rows of orifice holes are distributed on the arc surface of the orifice plate, the angle between the holes of two adjacent rows of orifice plates is 11.25°, and the holes in two adjacent rows The arc surface distance between the plate openings is 30-40mm; the air blowing orifice plate surface and the orifice arc surface are arranged periodically, and are interconnected as a unified whole; the orifice plate of the new blast type quick-freezing machine is installed on the quick-freezing machine One side of the mesh belt, and the surface of the positive blowing orifice plate is parallel to the plane of the mesh belt; the distance between the surface of the positive blowing orifice plate and the mesh belt is 50-100mm.

The arc surface radius R of the orifice plate is determined by the arc surface distance L between two adjacent rows of orifice plate openings; the relationship between the two is: R=16L/π.

The hole spacing along the groove direction is 35-45mm.

The hole spacing along the groove direction is 40mm.

The hole radius of the orifice is 5mm.

The width A of the orifice plate of the quick-freezing machine is determined according to the width B of the mesh belt of the quick-freezing machine, and the relationship between the two is: A=B+50mm.

The length C of the orifice plate of the quick-freezing machine is determined by the length D of the static pressure box of the quick-freezing machine, and the relationship between the two is: C=D.

The orifice plate of the new blast type quick-freezer is made of stainless steel.

A new orifice plate of blast type quick-freezing machine described in the present invention can effectively improve the heat transfer coefficient of the side of the frozen food, reduce the freezing time of the frozen food, and better improve the single-direction impact of the traditional flat orifice plate. This problem provides a new way of thinking for the study of improving the freezing rate of the blast freezer.

Description of drawings

Fig. 1 is a kind of three-dimensional schematic diagram of orifice plate of novel blast type quick-freezing machine of the present invention;

Fig. 2 is a partial enlarged schematic diagram of the orifice plate of a novel blast type quick-freezing machine of the present invention;

In Fig. 1, 1, the face of the orifice plate for blowing air; 2, the curved surface of the orifice plate; 3, the opening of the orifice plate.

detailed description

In order to make the operation process and creative features realized by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

The orifice plate of the blast type quick-freezing machine includes a positive blowing orifice plate surface 1, an orifice arc surface 2, and an orifice opening 3; the orifice plate structure of the new blasting type quick-freezing machine is characterized in that the width of the positive blowing orifice plate surface 1 is 80mm , the orifice plate surface of length A; the arc surface 2 of the orifice plate is a circular arc surface with a radius R and the included angle of the arc surface is 45°; The radius of the orifice hole 3 is 5mm, and the hole spacing along the direction of the groove is 40mm; the orifice arc surface 2 is distributed with three rows of orifice holes 3, and the angle between two adjacent rows of orifice holes 3 is 11.25° , and the arc surface distance between two adjacent rows of orifice plate openings 3 is 35mm; the positive blowing orifice plate surface 1 and the orifice arc surface 2 are arranged periodically, and are interconnected as a unified whole; The orifice plate of the quick-freezing machine is installed on the side of the mesh belt of the quick-freezing machine, and the face 1 of the positive blowing orifice plate is parallel to the plane of the mesh belt; the distance between the face 1 of the blowing orifice plate and the mesh belt is 70mm.

The radius R of the arc surface 2 of the orifice plate is determined by the arc distance L between the openings 3 of the orifice plates in two adjacent rows; the relationship between the two is: R=16L/π; in this example, the openings of the two adjacent rows of orifice plates The arc surface distance between the holes 3 is L=35mm, therefore, the arc surface 2 radius of the orifice plate is R=16L/π=16*35/π=178mm.

The width A of the orifice plate of the quick-freezing machine depends on the width B of the mesh belt of the quick-freezing machine. The relationship between the two is: A=B+50mm. In this example, the width of the mesh belt of the quick-freezing machine is B=1200mm. Width A=B+50mm=1200+50=1250mm.

The length C of the orifice plate of the quick-freezing machine is determined by the length D of the static pressure box of the quick-freezing machine. The relationship between the two is: C=D. =D=8000mm.

The orifice plate of the new blast type quick-freezer is made of stainless steel.

In this example, the cooling air blown into the plenum box by the fan passes through the orifice plate to achieve a balanced pressure release. When the cold air releases pressure through the surface of the orifice plate, the static pressure energy of the air is converted into dynamic pressure energy at this time, making the air flow through the orifice The air flow rate of the plate opening to release the pressure is instantly increased to 8-20m/s, and the high-speed flowing cold air blows to the bottom of the orifice plate to freeze the food, especially the cold air jetted to the surface of the food through the arc surface of the orifice plate. The traditional single-direction air supply method. Through the numerical simulation of the use process of the orifice plate, the simulation results show that the angle between the adjacent openings on the arc surface of the orifice plate makes the cold air flow injected through the orifice plate openings not on the same plane, so that the frozen food The side is effectively impacted by the cooling air, and compared with the ordinary flat orifice plate currently used, the freezing time is significantly shortened.

A novel orifice plate of a blast-type quick-freezer according to the invention can effectively increase the side convective heat transfer coefficient of quick-frozen food, reduce the freezing time of the food, and provide a new idea for research on improving the freezing rate of quick-freezers.

Claims (8)

1. A new orifice plate for blast-type quick-freezing machine, characterized in that: the orifice plate for blast-type quick-freezing machine includes positive blowing orifice plate surface (1), orifice arc surface (2), orifice plate opening (3) The structure of the orifice plate of the new blast type quick-freezing machine is characterized in that: the orifice plate surface (1) of the positive blowing orifice plate is 80mm wide and long A; the arc surface of the orifice plate (2) is radius R, and the angle between the arc surface 45° arc surface; the chord surface of the orifice arc surface (2) is on the same plane as the blowing orifice plate surface (1); the orifice hole (3) has a radius of 4-6 mm, and the hole is along the direction of the groove The spacing is 30-50mm; three rows of orifice openings (3) are distributed on the arc surface of the orifice plate (2), the angle between two adjacent rows of orifice openings (3) is 11.25°, and two adjacent rows of holes The arc surface distance between the plate openings (3) is 30-40mm; the positive blowing orifice plate surface (1) and the orifice arc surface (2) are arranged periodically and are interconnected as a unified whole; The orifice plate of the type quick-freezing machine is installed on the side of the mesh belt of the quick-freezing machine, and the surface of the orifice plate (1) is parallel to the plane of the mesh belt; the distance between the surface of the orifice plate (1) and the mesh belt is 50-100mm . 2. A new orifice plate for blast-type quick-freezer as claimed in claim 1, characterized in that: the radius R of the arc surface (2) of the orifice plate is formed by the arc surface between two adjacent rows of orifice plate openings (3). The distance L is determined; the relationship between the two is: R=16L/π. 3. A new orifice plate for blast-type quick-freezing machine as claimed in claim 1, characterized in that: the hole spacing along the direction of the groove is 35-45mm. 4. A new orifice plate for blast-type quick-freezer as claimed in claim 1, characterized in that the hole spacing along the direction of the groove is 40mm. 5. A new orifice plate for blast-type quick-freezing machine according to claim 1, characterized in that: the radius of the opening (3) of the orifice plate is 5mm. 6. The orifice plate of a novel blast type quick-freezing machine as claimed in claim 1, characterized in that: the width A of the orifice plate of the quick-freezing machine is determined according to the width B of the mesh belt of the quick-freezing machine, and the relationship between the two is: A =B+50mm. 7. The orifice plate of a novel blast type quick-freezing machine as claimed in claim 1, characterized in that: the length C of the orifice plate of the quick-freezing machine is determined according to the length D of the static pressure box of the quick-freezing machine, and the relationship between the two is: C=D. 8. The orifice plate of a novel blast-type quick-freezing machine as claimed in claim 1, wherein the orifice plate of the novel blast-type quick-freezing machine is made of stainless steel.