JP2019045102A - Continuous transport type freezer - Google Patents

Abstract

To provide a continuous transport type freezer which can cool workpieces more efficiently.SOLUTION: A continuous transport type freezer 1 has: a housing 10 forming a cooling space enclosed by a heat insulation wall; a conveyor belt 20 which is provided within the housing and transports workpieces W; a cooling air circulation part 30 which circulates cooling air c in the housing; and a slit nozzle unit 40 which jets the cooling air to the workpieces to cool the workpieces. Slit nozzles 41 provided at the slit nozzle unit are disposed so as to extend in a direction that intersects with an orthogonal direction D2 orthogonal to a transport direction D1 in which the workpieces are transported.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a continuous transfer type freezer.

  2. Description of the Related Art Conventionally, there has been known a continuous transfer type freezer which cools by continuously injecting cold air to a work while transporting the work such as food by a conveyor belt housed in a housing.

  In relation to this, for example, in Patent Document 1 below, a slit nozzle disposed to extend in a direction orthogonal to the conveyance direction of the work piece sprays vertically toward the conveyor belt, The structure which cools a workpiece | work by forming the cold air | gas circulation path which returns to a cooler (cooler) from the recessed part (exhaust path) between slit nozzles is disclosed.

WO2006 / 046317 International Publication

  However, with respect to the configuration of Patent Document 1, it is required to cool the work more efficiently and to reduce the influence of the cold air to the outside of the storage.

  The present invention was invented to solve the above-mentioned problems, and an object thereof is to provide a continuous transfer type freezer capable of cooling a work more efficiently and reducing the influence of cold air outside the storage. .

  A continuous transfer type freezer according to the present invention for achieving the above object comprises a housing forming a cooling space surrounded by a heat insulating wall, a conveyor belt provided in the housing for transferring a work, and cold air in the housing And a slit nozzle unit which jets the cold air to the work to cool the work. Further, the slit nozzle provided in the slit nozzle unit is arranged to extend in a direction intersecting with an orthogonal direction orthogonal to the conveying direction in which the work is conveyed.

  According to the continuous transfer type freezer configured as described above, the heat transfer to the work W is compared with the continuous transfer type freezer arranged such that the slit nozzle extends in the direction orthogonal to the transfer direction of the work Improve the rate. Further, the amount of cold air leakage can be reduced as compared with a continuous transfer type freezer in which the slit nozzles are arranged to extend in a direction orthogonal to the transfer direction of the work. Therefore, it is possible to provide a continuous transfer type freezer that can cool the work more efficiently and reduce the influence of cold air outside the storage.

It is a schematic perspective view which shows the continuous conveyance type freezer concerning this embodiment. It is a perspective view showing a slit nozzle unit concerning this embodiment. It is a front view showing a slit nozzle unit concerning this embodiment. It is a top view which shows the slit nozzle unit of the continuous conveyance type freezer concerning a comparative example. It is a graph which shows the temperature transition of a 1st test piece. It is a graph which shows the temperature transition of a 2nd test piece. FIG. 7 (A) is a view showing a state of cold air leakage of the continuous transfer type freezer according to the embodiment, and FIG. 7 (B) is a view showing a state of cold air leak of the continuous transfer type freezer according to the comparative example. It is.

  Embodiments of the present invention will be described with reference to FIGS. 1 to 3. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. The dimensional proportions of the drawings are exaggerated for the convenience of the description, and may differ from the actual proportions.

  FIG. 1 is a schematic perspective view showing a continuous transfer type freezer 1 according to the present embodiment. FIG. 2 is a perspective view showing the slit nozzle unit 40 according to the present embodiment. FIG. 3 is a front view showing the slit nozzle unit 40 according to the present embodiment.

  As shown in FIG. 1, the continuous transfer type freezer 1 circulates cool air that circulates cool air c in the housing 10 forming a cooling space surrounded by a heat insulating wall, a conveyor belt 20 transferring a work W, and the housing 10. It has the part 30 and the slit nozzle unit 40 which ejects the cold air c with respect to the workpiece W. The workpiece W transported by the conveyor belt 20 is not particularly limited, but it can be applied to scallops, fish fillets, fish meat such as crab meat, and livestock meat such as viscera of cows, pigs and chickens.

  The housing 10 is configured in a substantially rectangular shape as shown in FIG. The housing 10 has an inlet opening which is an inlet of the workpiece W, and an outlet opening which is an outlet of the workpiece W. Although the material which comprises the housing 10 is not specifically limited, It is preferable to provide heat insulation.

  The conveyor belt 20 conveys the workpiece W from the inlet opening of the housing 10 to the outlet opening. The workpiece W is placed on the conveyor belt 20 and is rapidly frozen as it passes through the housing 10.

  The cold air circulation unit 30 has a cooler 31 for cooling the air in the housing 10, and a fan 32 for sending the air (cold air c) cooled by the cooler 31 toward the slit nozzle unit 40. A positive pressure zone is formed in the upper space of the slit nozzle unit 40 by the fan 32.

  The cooler 31 is disposed inside the side wall of the housing 10. A refrigerant is supplied to the cooler 31 from a refrigerator unit (not shown) provided outside the housing 10 to cool the air in the housing 10.

  The fan 32 is provided above the cooler 31. The air (cold air c) cooled by the cooler 31 is sent by the fan 32 toward the slit nozzle unit 40, and a positive pressure zone is formed in the upper space of the slit nozzle unit 40.

  The slit nozzle unit 40 is provided adjacent to the cooler 31 and below the fan 32. The slit nozzle unit 40 is supported by a support 90. A plurality of slit nozzle units 40 are arranged to be liftably mounted on the support by the support columns 90 along the transport direction D1. The slit nozzle unit 40 has a plurality of slit nozzles 41.

  The slit nozzle 41 is disposed so as to extend in a direction inclined 45 degrees with respect to the transport direction D1 of the workpiece W, as shown in FIG. In other words, as shown in FIG. 2, the slit nozzle 41 is arranged to extend in a direction inclined 45 degrees with respect to the orthogonal direction D2 orthogonal to the transport direction D1 of the workpiece W. The jet holes 41a provided at the tip of the slit nozzle 41 form a slit-like opening directed in a direction inclined 45 degrees with respect to the transport direction D1 and the orthogonal direction D2.

  As shown in FIG. 3, the slit nozzles 41 are arranged at equal intervals at a pitch P when the slit nozzle unit 40 is viewed from the front (the diagonally lower left in FIG. 2).

  The slit nozzle 41 has an accelerating portion 42 having a funnel-shaped cross section and a rectifying portion 43 having the same flow passage cross-sectional area.

  The cool air c sent to the slit nozzle unit 40 is accelerated by the acceleration unit 42, rectified by the rectification unit 43, and then jetted from the jet holes 41 a toward the conveyor belt 20.

  Next, the flow of the cold air c in the housing 10 will be described.

  As shown in FIG. 1, the air (cold air c) cooled in the cooler 31 is sent by the fan 32 toward the slit nozzle unit 40. Then, as shown in FIG. 3, the cool air c sent to the slit nozzle unit 40 is jetted out as a collision jet from the jet holes 41 a of the slit nozzle 41 toward the work W on the conveyor belt 20 to cool the work W Do.

  At this time, since the cold air c blown out from the ejection holes 41 a collides in the vertical direction with the work W, a stable thin film flow enveloping the work W in close contact with the side surface of the work W by the Coanda effect Can. This thin film flow can make the heat transfer coefficient to the work W extremely good and improve the cooling effect.

<Example>
Hereinafter, the present invention will be described in more detail by way of examples with reference to FIGS. 4 to 7. However, the technical scope of the present invention is not limited to the following examples.

  FIG. 4 is a top view showing the slit nozzle unit 340 of the continuous transfer type freezer according to the comparative example. FIG. 5 is a graph showing the temperature transition of the first test piece. FIG. 6 is a graph showing the temperature transition of the second test piece. FIG. 7A is a view showing a state of cold air leakage of the continuous transfer type freezer 1 according to the embodiment, and FIG. 7B is a view showing a state of cold air leak of the continuous transfer type freezer according to the comparative example. FIG.

  First, the configuration of the slit nozzle unit 340 of the continuous transfer type freezer according to the comparative example will be described with reference to FIG. In the slit nozzle unit 340 of the continuous transfer type freezer according to the comparative example, as shown in FIG. 4, a slit nozzle 341 arranged to extend in the orthogonal direction D2 orthogonal to the transfer direction D1 of the work W It is provided. When the slit nozzle unit 340 is viewed from the front (left side in FIG. 4), the pitch P between the slit nozzles 341 is 80 mm.

  On the other hand, as the continuous transfer type freezer 1 according to the embodiment, the pitch P between the slit nozzles 41 is 80 mm when the slit nozzle unit 40 is viewed from the front (see FIG. 3).

  A gel test package (first test piece) is used as a work W using the above-described two types of continuous transfer type freezers (continuous transfer type freezer 1 according to the embodiment and continuous transfer freezer according to the comparative example) The result of measuring the temperature transition of the first test piece is shown in FIG. In FIG. 5, the solid line indicates the transition of the temperature of the first test piece when using the continuous transfer type freezer 1 according to the embodiment, and the dotted line indicates the first test piece when using the continuous transfer type freezer according to the comparative example. Temperature transition.

  As shown in FIG. 5, according to the continuous transfer type freezer 1 according to the embodiment, the speed for cooling the work W is improved and the work W is cooled more efficiently than the continuous transfer type freezer according to the comparative example. It turned out that it can be done. In addition, it was found that the heat transfer coefficient to the first test piece (work W) was improved by about 1.2 times.

  Furthermore, stainless steel (second test piece) is used as the work W using the two types of continuous transfer type freezers described above (continuous transfer type freezer 1 according to the embodiment and continuous transfer freezer according to the comparative example). The result of measuring the temperature transition of the test piece is shown in FIG. In FIG. 6, the solid line represents the temperature transition of the second test piece when using the continuous transfer type freezer 1 according to the embodiment, and the dotted line represents the second test piece when using the continuous transfer type freezer according to the comparative example. Temperature transition. In FIG. 6, numerical values obtained by making the temperature non-dimensional are used as the vertical axis.

  As shown in FIG. 6, according to the continuous transfer type freezer 1 according to the embodiment, the speed for cooling the work W is improved and the work W is cooled more efficiently than the continuous transfer type freezer according to the comparative example. It turns out that you can do it. In addition, it was found that the heat transfer coefficient to the second test piece (work W) was improved by about 1.2 times.

  Hereinafter, two reasons why the continuous transfer type freezer 1 according to the present embodiment can cool the work W more efficiently than the continuous transfer type freezer according to the comparative example will be described.

  As the first point, the slit nozzle 41 is inclined by 45 degrees with respect to the orthogonal direction D2, whereby the distance L1 (see FIG. 2) between the adjacent slit nozzles 41 when viewed from above is continuous according to the comparative example. The distance between the slit nozzles 341 of the transfer type freezer (corresponding to the pitch P (see FIG. 4)) is approximately 1 / 1.41. That is, since the distance L1 between the adjacent slit nozzles 41 becomes short, the amount of injection of the cold air c to the conveyor belt 20 increases, and the work W can be cooled more efficiently.

  The second reason is as follows. That is, in the continuous transfer type freezer 90 according to the comparative example, the cold air leakage generated at the inlet opening 91 or the outlet opening 92 for the work W is a curtain having a thickness in the width direction as shown in FIG. 7B. Flow out. On the other hand, in the continuous transfer type freezer 1 according to the embodiment, the cold air leakage generated at the inlet opening 11 or the outlet opening 12 for the work W is interrupted in the width direction as shown in FIG. 7A. Flow out in a straight line. As described above, according to the continuous transfer type freezer 1 according to the embodiment, the amount of cold air leakage flowing out of the storage can be reduced, so that the work W can be cooled more efficiently. Furthermore, it is possible to reduce the adverse effect on the cooling performance due to the cold air leaking out of the refrigerator to adversely affect workers and the air outside the refrigerator flowing in and frost on the cooler.

  As shown in FIG. 1, the cold air jetted to the work W is returned to the cold air circulation unit 30 from the exhaust passage 44 (see FIG. 2) formed in the recess between the slit nozzles 41. Cold air leakage can be reduced by forming the exhaust passage 44 in the direction opposite to the cold air leakage direction as the inclination of the slit nozzle unit 40 is formed.

  As described above, according to the continuous transfer type freezer 1 according to the present embodiment, the distance L1 between the adjacent slit nozzles 41 is shorter than that of the continuous transfer type freezer according to the comparative example. The amount of injection of the cold air c to the air increases. Therefore, cold air leakage from the conveyor belt 20 can be suitably prevented.

  As described above, the continuous transfer type freezer 1 according to the present embodiment includes the housing 10 forming a cooling space surrounded by the heat insulating wall, and the conveyor belt 20 provided in the housing 10 to transfer the work W; In the housing 10, there are provided a cold air circulating portion 30 for circulating the cold air c, and a slit nozzle unit 40 for discharging the cold air c to the workpiece W to cool the workpiece W. Further, the slit nozzle 41 provided in the slit nozzle unit 40 is arranged to extend in a direction intersecting the orthogonal direction D2 orthogonal to the conveyance direction D1 in which the work W is conveyed. According to the continuous transfer type freezer 1 configured as described above, as described above, the continuous transfer type in which the slit nozzle 41 is arranged to extend in the orthogonal direction D2 orthogonal to the transfer direction D1 of the work W The heat transfer coefficient to the work W is improved as compared to the freezer. Further, the amount of cold air leakage can be reduced as compared with a continuous transfer type freezer in which the slit nozzle 41 is arranged to extend in the orthogonal direction D2 orthogonal to the transfer direction D1 of the work W. Therefore, it is possible to provide the continuous transfer type freezer 1 capable of cooling the work W more efficiently and reducing the influence of the cold air outside the storage.

  In addition, the slit nozzle 41 is disposed to extend in a direction inclined 45 degrees with respect to the orthogonal direction D2. According to the continuous transfer type freezer 1 configured as described above, the work W can be cooled more efficiently.

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the claims.

  For example, in the embodiment described above, the cold air c is injected only from the upper side of the conveyor belt 20. However, the cold air c may be jetted from the lower side of the conveyor belt 20 as well.

  Further, in the embodiment described above, the slit nozzle 41 is disposed so as to extend in a direction inclined 45 degrees with respect to the orthogonal direction D2 orthogonal to the conveyance direction D1 of the work W, as shown in FIG. . However, the slit nozzle is not particularly limited as long as it is disposed in a direction intersecting the orthogonal direction D2 orthogonal to the transport direction D1 of the workpiece W.

1 Continuous transfer freezer,
10 housings,
20 conveyor belts,
30 cold air circulation department,
40 slit nozzle units,
41 slit nozzles,
c Cold air D1 transport direction,
D2 orthogonal direction,
W work.

Claims (2)

A housing that forms a cooling space surrounded by an insulating wall;
A conveyor belt provided in the housing for transporting the workpiece;
A cold air circulating unit for circulating cold air in the housing;
And Slit nozzle unit for discharging the cold air to the work to cool the work.
The slit nozzle provided in the said slit nozzle unit is a continuous conveyance type freezer arrange | positioned so that it may extend in the direction orthogonal to the orthogonal direction orthogonal to the conveyance direction in which the said workpiece | work is conveyed.   The continuous transfer type freezer according to claim 1, wherein the slit nozzle is disposed to extend in a direction inclined 45 degrees with respect to the orthogonal direction.