JPH0519726Y2 - - Google Patents

Description

[Detailed description of the invention] a. Industrial application field This invention is applied to a cylindrical ice-making machine that produces ice by flowing ice-making water down the inner wall surface of an inner cylindrical part and peeling off the ice that has grown on the surface with a rotating blade. This relates to a type of evaporator.

b. Conventional technology Conventionally, mainly for the purpose of reducing manufacturing costs, a cylindrical evaporator for ice making machines has a double pipe structure consisting of an inner cylinder part and an outer cylinder part, and a refrigerant inlet pipe and a refrigerant outlet pipe are provided in the outer cylinder part. Directly attached devices are known. and,
In this case, when the refrigerant entering from the refrigerant inlet pipe flows through the annular gap between the inner cylinder and the outer cylinder, the refrigerant cools the ice-making water flowing down the inner wall of the inner cylinder. , ice is produced on the inner wall surface of the inner cylinder.

c Problems to be solved by the invention In the conventional cylindrical evaporator for ice making machines as described above, when the refrigerant flows through the annular gap, it takes a path with small pressure loss, and as a result, the refrigerant inlet pipe Since the refrigerant tries to flow through the shortest path between the refrigerant and the refrigerant outlet pipe, the refrigerant flows in a part of the annular gap, which causes a problem of poor cooling efficiency. In addition, it is desirable that the gap size of the annular gap is uniform in the circumferential direction;
The refrigerant flow is not uniform due to distortion and eccentricity of the inner cylinder and outer cylinder, resulting in uneven refrigerant flow and areas where ice does not grow at all or does not grow sufficiently on the inner wall of the inner cylinder. There was also the problem that this occurred.

This invention was made in order to solve such problems, and the object is to obtain a cylindrical evaporator for an ice making machine that has good cooling efficiency and has a constant gap size in the annular gap.

d Means for solving the problem The cylindrical evaporator for an ice making machine according to this invention includes an inner cylinder part 1 and an inner cylinder part 1 arranged concentrically with the inner cylinder part 1.
an outer cylindrical part 3 which forms an annular cavity 2 together with a heat insulating material attached to the outer wall surface; and an annular cavity 2.
A hollow and annular upper annular small chamber 6 provided at the upper part of the annular cavity 2, a hollow annular lower annular small chamber 9 provided at the bottom of the annular cavity 2, and a lower annular small chamber connected to the lower annular small chamber 9 to supply the refrigerant to the lower annular small chamber. Refrigerant inlet pipe 1 leading to 9
0, a refrigerant outlet pipe 11 connected to the upper annular small chamber 6 and discharging the refrigerant to the outside, and a partition plate 14 provided in the annular cavity 2 and dividing the annular cavity 2,
A plurality of first small holes 16 are formed in each of the upper annular small chamber 6 and the lower annular small chamber 9 at intervals in the circumferential direction, and a plurality of first small holes 16 are formed in the partition plate 14 at intervals in the circumferential direction. A second small hole 17 is formed therein, and a stepped portion 15 protruding from the outer cylindrical portion 3 is formed on the outer periphery of the second small hole 17 .

e Effect In this invention, the refrigerant led from the refrigerant inlet pipe 10 to the lower annular chamber 9 is guided radially from the first small hole 16 of the lower annular chamber 9 into the lower annular cavity 13, and further through the partition plate. 14 second small holes 1
7 into the upper annular cavity 12 and flows throughout the annular cavity 2, the inner cylindrical part 1 is uniformly cooled over the entire area.

f. Example Hereinafter, an example of this invention will be described with reference to the drawings. Figures 1 to 3 show an embodiment of this invention, in which ice-making water flows down onto the inner wall surface and ice is generated on the outer periphery of the inner cylinder section 1. An outer cylindrical portion 3 is disposed concentrically with the inner cylindrical portion 1 and forms an annular cavity 2 with the inner cylindrical portion 1. A first flange 4 and an upper annular member 5 are disposed in the upper part of the annular cavity 2.
An annular upper annular chamber 6 with a hollow cavity formed from
is provided. At the bottom of the annular cavity 2, there is a second
An annular lower annular chamber 9 is provided in a cavity formed by the flange 7 and the lower annular member 8.
A refrigerant inlet pipe 10 is connected to the lower annular chamber 9 to introduce the refrigerant into the lower annular chamber 9 . The upper annular chamber 6 has a refrigerant outlet pipe 11 for discharging the refrigerant to the outside.
is connected. The annular cavity 2 has an annular flat partition plate 14 that divides the annular cavity 2 into two to form an upper annular cavity 12 and a lower annular cavity 13.
is provided. The partition plate 14 has a stepped portion 1 on the circumference.
5 is formed, and its stepped portion 15 protrudes from the outer wall surface of the outer tube portion 3, and is provided with reinforcement against the force acting on the inner tube portion 1 and a heat insulating material (not shown) provided on the outer wall surface of the outer tube portion 3. ) has a locking function.

To attach the partition plate 14 to the annular cavity 2, first insert the partition plate 14 into the inner cylinder part 1, and then
The part B is welded by brazing, then the stepped part 15 of the partition plate 14 is sandwiched between the divided outer cylinder parts 3, and the part B is welded by brazing.

A plurality of first small holes 16 are formed in the inner peripheral surfaces of each of the upper annular small chamber 6 and the lower annular small chamber 9 at equal intervals in the circumferential direction. Partition plate 14
has second small holes 1 at equal intervals in the circumferential direction.
7 is formed. This second small hole 17 is located in the middle of each adjacent first small hole 16.

In the cylindrical evaporator for an ice maker configured as described above, the refrigerant supplied from the refrigerant inlet pipe 10 enters the lower annular chamber 9 having a cross-sectional area larger than the refrigerant passage cross-sectional area of the first small hole 16. To be guided,
The pressure of the refrigerant in the lower annular chamber 9 remains approximately constant throughout. In this state, the refrigerant flows through the first small hole 16.
and is blown into the lower annular cavity 13. Furthermore, the refrigerant is almost uniformly blown into the upper annular cavity 12 due to the same pressure equalization effect as described above by the second small hole 17, and the inner cylinder part 1 is cooled almost uniformly over the entire circumferential surface. . After this, the refrigerant passes through the first small hole 16 and the upper annular small chamber 6 into the refrigerant outlet pipe 11.
is discharged outdoors.

The ice-making water in the water sprinkling tank 18 flows down through the water sprinkling pipe 19 over the inner wall surface of the inner cylindrical portion 1 cooled in this manner, and on the way, the ice-making water receives the cold heat and undergoes a phase change into ice.

Incidentally, as shown in FIG. 4, the upper annular small chamber 6 and the lower annular small chamber 9 may be formed using a partition plate 14 having a stepped portion 15 together with the second small hole. Also,
A plurality of similar partition plates 14 may be attached to the annular cavity 2.

g. Effect of the invention As explained above, the cylindrical evaporator for an ice maker of this invention has the first small hole 16 formed in the lower annular small chamber 9 and the upper annular small chamber 6, and the flat partition plate 14. The refrigerant flows uniformly within the annular gap 2 due to the pressure equalization effect of the second small holes 17 formed, resulting in improved cooling efficiency. In addition, the partition plate 14
In this case, the distortion and eccentricity of the inner cylinder part 1 and the outer cylinder part 3 which are already present can be corrected during manufacturing, and the gap size of the annular cavity part 2 can be made constant. Further, the partition plate 14 acts as a reinforcing member against the load on the inner cylinder part 1 when, for example, ice is removed from the inner wall surface of the inner cylinder part 1, and the deformation thereof can be suppressed with a small member. Furthermore, the stepped portion 15 protruding from the outer wall surface of the outer tube portion 3 has the effect of reinforcing the load of the inner tube portion 1 and locking the heat insulating material attached to the outer wall surface of the outer tube portion 3.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a cylindrical evaporator for an ice maker showing one embodiment of this invention, with the right side omitted from the axis center, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 FIG. 1 is an enlarged sectional view of the main part, and FIG. 4 is a sectional view showing another embodiment of this invention. 1... Inner cylindrical part, 2... Annular cavity, 3... Outer cylindrical part, 6... Upper annular chamber, 9... Lower annular chamber,
10... Refrigerant inlet pipe, 11... Refrigerant outlet pipe, 14
...Partition plate, 15...Step, 16...First small hole, 17...Second small hole. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] An inner cylinder part 1 through which ice-making water flows down on the inner wall surface, an annular hollow part 2 formed together with the inner cylinder part 1 by being arranged concentrically with the inner cylinder part 1, and a heat insulating material attached to the outer wall surface. an outer cylindrical portion 3; a hollow and annular upper annular chamber 6 provided in the upper part of the annular cavity 2; and a hollow and annular lower annular chamber 9 provided in the lower part of the annular cavity 2; A refrigerant inlet pipe 10 connected to the lower annular chamber 9 and guiding the refrigerant to the lower annular chamber 9, a refrigerant outlet pipe 11 connected to the upper annular chamber 6 and discharging the refrigerant to the outside, and a refrigerant outlet pipe 11 connected to the upper annular chamber 6 and discharging the refrigerant to the outside. The upper annular small chamber 6 and the lower annular small chamber 9 each have a plurality of first small holes at intervals in the circumferential direction. 16 are formed in the partition plate 14, and a plurality of second small holes 17 are formed in the partition plate 14 at intervals in the circumferential direction, and the outer circumferential portion thereof has a plurality of second small holes 17 formed therein. Projected step 15
A cylindrical evaporator for an ice making machine, in which ice grown on the inner wall surface of the inner cylinder part 1 is peeled off by a rotating blade to produce ice.