JPH0414264B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cylindrical evaporator in an auger ice maker.

[Conventional technology]

Conventionally, mainly for the purpose of reducing manufacturing costs, it has been proposed that a cylindrical evaporator has a double-tube structure consisting of an inner peripheral part and an outer cylinder part, and a refrigerant inlet pipe and an outlet pipe are directly attached to the outer cylinder part. Ta. In this cylindrical evaporator, the refrigerant supplied from the refrigerant inlet pipe passes through the annular space between the inner and outer cylindrical parts and exits the evaporator from the refrigerant outlet pipe. Since the refrigerant tries to flow through the shortest path, the flow of the refrigerant in the annular cavity is biased towards the refrigerant inlet pipe and outlet pipe, resulting in a decrease in the evaporative heat transfer area and an area where ice does not form on the ice-making surface. As a result, the amount of ice produced was drastically reduced. In other words, the ice-making surface on the side where the refrigerant inlet pipe and the refrigerant outlet pipe are provided is sufficiently cooled, but the ice-making surface on the opposite side is not sufficiently cooled.

[Problem that the invention seeks to solve]

Therefore, the conventional double-tube evaporator has a problem in terms of ice-making efficiency, and has been merely a proposal and has not been put to practical use.

[Means for solving problems]

The purpose of the present invention is to provide a means for quickly solving the above-mentioned problems.The present invention aims to provide a means for quickly solving the above-mentioned problems. In a cylindrical evaporator for an ice making machine that produces ice by exfoliating ice, an inner cylinder member and an outer cylinder member are arranged coaxially with an annular cavity therebetween, and are in fluid communication with the annular cavity. an upper annular chamber and a lower annular chamber disposed at the upper and lower ends of the evaporator, and a refrigerant outlet pipe and a refrigerant inlet pipe connected in fluid communication to the upper and lower annular chambers, respectively; A plurality of small holes are bored at equal intervals in the circumferential direction in the circumferential wall defining the upper and lower annular chambers, and the refrigerant flows between each of the upper and lower annular chambers and the annular cavity through the small holes. It is characterized by fluid communication.

[Effect]

In the above configuration, the refrigerant supplied from the refrigerant inlet pipe is guided radially throughout the annular cavity from each small hole in the lower annular compartment, and the refrigerant in the annular cavity is guided to each of the upper annular compartments. By leading the refrigerant to the outlet pipe through the small hole, a substantially uniform flow of the refrigerant within the annular cavity is obtained, and the ice is uniformly frozen over the entire surface of the ice making surface.

〔Example〕

Hereinafter, the cylindrical evaporator structure for an ice maker according to the present invention will be described in detail with reference to the drawings.

In the drawings, the reference numeral 1 indicates an evaporator having a generally cylindrical shape. It is composed of an inner cylinder member 2 and an outer cylinder member 3 having different diameters, and a pair of annular flange members 4, 4 are provided at both ends of the inner cylinder member 2 and outer cylinder member 3. It is being

The annular hollow portion 1a is held in a closed state by each flange member 4, 4, and an upper annular member 5 and a lower annular member each having an annular shape as a whole are provided in the extension portions 4a, 4a of each of the flange members 4, 4. 6 are integrally provided. An upper annular chamber 8 and a lower annular chamber 9 are formed by the circumferential walls 7, 7, the flange members 4, 4, and the upper and lower annular members 5, 6, which form part of the outer cylinder member 3.

As shown in FIGS. 1 and 2, each circumferential wall 7, 7 has a large number of small holes 1 arranged radially along each circumferential wall 7, 7 and at equal intervals approximately in the circumferential direction.
A refrigerant outlet pipe 11 is integrally provided in the upper annular member 5 of the upper annular small chamber 8, and a refrigerant inlet pipe 12 is integrally provided in the lower annular member 6 of the lower annular small chamber 9. It is being

A water sprinkler tank 13 is disposed on the axial center of the cylindrical evaporator 1, and a water sprinkler pipe 13 of this water sprinkler 13
The ice-making surface 1b is formed on the inner circumferential surface of the cylindrical evaporator 1, and water is sprayed onto the upper part of the ice-making surface 1b.

Furthermore, the configuration shown in FIG. 3 shows another embodiment according to the present invention, in which an annular cavity is formed between each inner cylinder member 2 and outer cylinder member 3 constituting the cylindrical evaporator 1. A connecting plate 7a constituting an annular circumferential wall 7 is integrally attached to the upper and lower parts of the portion 1a, and the connecting plate 7a, the outer cylindrical members 2 and 3, and the flanges 4 and 4 form an upper and lower annular small chamber. 8 and 9 are formed in the outer cylinder member 3, and a refrigerant outlet pipe 11 and a refrigerant inlet pipe 12 are respectively formed in the outer cylinder member 3.

Note that the upper and lower annular chambers may be arranged inside the inner cylinder member, and the outer peripheral surface of the outer cylinder member may be used as the ice-making surface.

In the above configuration, when using the cylindrical evaporator according to the present invention by flowing the refrigerant, the refrigerant supplied from the refrigerant inlet pipe 12 has a cross section larger than the refrigerant passage cross section of the small hole 10. Since the air is introduced into the lower annular chamber 9 having a large area, the pressure inside the lower annular chamber 9 is almost constant throughout, and the air is uniformly blown into the annular cavity 1a through the radially arranged small holes 10. The entire ice-making surface 1b is cooled almost uniformly over the entire circumference, and then the refrigerant reaches the small hole 10 in the upper part again, and as described above, the pressure equalization effect is obtained by the small hole 10 and the upper annular small chamber 8. Therefore, the annular hollow part 1a
The upper annular chamber 8 passes through the small hole 10 almost uniformly.
The refrigerant is sent to the refrigerant outlet pipe.

As described above, when the ice making water is sprinkled from the water sprinkling pipe 13a in a state where the entire ice making surface 1b is sufficiently and uniformly cooled over its entire circumference, the ice making surface 1b is
b Ice of uniform thickness is formed over the entire area. According to the results of the experiment, it was found that even if small holes were provided in either one of each annular chamber, a fairly uniform flow of refrigerant could be obtained. Complete was found to be sufficient.

〔Effect of the invention〕

Since the cylindrical evaporator structure for an ice maker according to the present invention has the above-described configuration and operation, the refrigerant flows uniformly within the annular space, and as a result, the ice making surface is uniformly cooled and ice is made. Ice of almost uniform thickness is formed over the entire surface, which greatly improves the ice-making capacity and reliability of the ice-making machine.In addition, it has a simple structure. Therefore, manufacturing costs can be significantly reduced.

[Brief explanation of drawings]

The drawings are for showing the cylindrical evaporator structure according to the present invention. FIG. 1 is a schematic sectional view showing the entire structure with the right side from the center of the axis omitted, and FIG.
A sectional view taken along line A, and FIG. 3 is a sectional view showing another embodiment. 1 is a cylindrical evaporator, 1a is an annular cavity, 1b is an ice making surface, 2 is an inner cylinder member, 3 is an outer cylinder member, 4 is a flange member, 5 is an upper annular member, 6 is a lower annular member, 7 is a In the circumferential wall, 7a is a connecting plate, 8 is an upper annular chamber, 9 is a lower annular chamber, 10 is a small hole, 11 is a refrigerant outlet pipe, and 12 is a refrigerant inlet pipe.

Claims (1)

[Claims] 1 A cylindrical evaporator for an ice making machine that produces ice by causing ice making water to flow down a cylindrical ice making surface 1b and peeling off the frozen ice on the ice making surface using a rotating blade, with an annular space between the two. an inner cylindrical member 2 and an outer cylindrical member 3 coaxially disposed with a diameter of 1a; and an upper annular chamber disposed at the upper and lower ends of the evaporator in fluid communication with the annular cavity 1a. 8 and lower annular chamber 9
and a refrigerant outlet pipe 11 and a refrigerant inlet pipe 12 connected in fluid communication to the upper and lower annular compartments 8 and 9, respectively. Multiple small holes equally spaced in the circumferential direction 1
A cylindrical evaporator for an ice-making machine, characterized in that a hole 10 is bored through the small hole 10, and refrigerant fluid is communicated between each of the upper and lower annular chambers 8, 9 and the annular cavity 1a.