JP2019039572A - refrigerator - Google Patents

Abstract

To make compatible both the securement of the rigidity of a cylinder and the favorable refrigeration performance of a refrigerator.SOLUTION: In a refrigerator for generating cold at one end side of a cylindrical cylinder, a rib continuing to the other end side from one end side is arranged at an external periphery of the cylinder. By this constitution, even if a wall thickness of a portion other than the rib out of the cylinder is thinned, the deformation of the cylinder can be suppressed by the rib, that is, the rigidity of the cylinder can be secured. Furthermore, since the wall thickness of the portion other than the rib out of the cylinder can be thinned, the flow-in of heat to one end side from the other end side of the cylinder can be suppressed, and favorable refrigeration performance can be secured. That is, the securement of the rigidity of the cylinder and the favorable refrigeration performance of the refrigerator can be made compatible.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a refrigerator.

  Conventionally, this type of refrigerator has been proposed in which an expansion chamber is formed by a cylinder and a displacer, and the displacer reciprocates in the cylinder to generate a refrigeration action around the expansion chamber (for example, Patent Documents). 1). Moreover, what forms the wall part of the cylinder of a refrigerator so that thickness may increase continuously toward a high temperature end part from a low temperature end part is proposed (for example, refer patent document 2). In the latter refrigerator, the rigidity of the cylinder is increased by configuring the cylinder in this way.

Japanese Patent Application Laid-Open No. 2014-6001 JP 2008-75991 A

  In the former refrigerator, the wall of the cylinder has a uniform thickness. To suppress heat inflow from the high temperature end of the cylinder to the low temperature end (end on the expansion chamber side), it is preferable to reduce the wall thickness of the entire cylinder, but if the cylinder thickness is reduced , Its rigidity will be low. Moreover, in the latter refrigerator, although the rigidity of the cylinder is easily ensured as compared with the former refrigerator, the wall thickness on the high temperature end side is large, so that the heat inflow from the high temperature end portion to the low temperature end portion is large. Therefore, the refrigeration performance tends to decrease.

  The main purpose of the refrigerator of the present invention is to ensure both the rigidity of the cylinder and the good refrigeration performance of the refrigerator.

  The refrigerator of the present invention employs the following means in order to achieve the main object described above.

The refrigerator of the present invention is
A refrigerator that generates cold on one end side of a cylindrical cylinder,
The outer periphery of the cylinder is provided with a rib that extends from the one end side to the other end side,
This is the gist.

  In the refrigerator of the present invention, in the refrigerator that generates cold on one end side of the cylindrical cylinder, a rib that extends from one end side to the other end side is provided on the outer periphery of the cylinder. As a result, even if the thickness of the cylinder other than the rib is reduced, the rib can suppress deformation of the cylinder, that is, the rigidity of the cylinder can be ensured. In addition, since the thickness of portions other than the ribs in the cylinder can be reduced, heat inflow from the other end side of the cylinder to the one end side can be suppressed, and good refrigeration performance can be ensured. That is, it is possible to achieve both of the rigidity of the cylinder and the good refrigeration performance of the refrigerator. Here, examples of the “freezer” include Gifford McMahon refrigerator (GM refrigerator) and Stirling refrigerator.

  In such a refrigerator of the present invention, the rib may be provided so as to be inclined with respect to the axial direction of the cylinder. If it carries out like this, the distance of the rib from the other end side of a cylinder to one end side can be lengthened, and the heat | fever inflow through the rib from the other end side to one end side can be suppressed more. In this case, the rib may be provided in a spiral shape.

  Moreover, the refrigerator of this invention WHEREIN: The sub-rib which connects two different points in the said rib may be further provided in the outer periphery of the said cylinder. In this way, the cylinder rigidity can be more sufficiently ensured.

  Further, in the refrigerator of the present invention, a cold head is fixed to the one end side of the cylinder, and the rib is provided on an outer periphery of a portion of the cylinder not surrounded by the cold head. It may be a thing.

2 is a configuration diagram showing an outline of the configuration of a refrigerator 20. FIG. 2 is an external view showing an external appearance of a cylinder 32 of the refrigerator 20. FIG. 2 is an external view showing an external appearance of a cylinder 132. FIG. 2 is an external view showing an external appearance of a cylinder 232. FIG. 3 is an external view showing an external appearance of a cylinder 332. FIG.

  Next, the form for implementing this invention is demonstrated. FIG. 1 is a configuration diagram illustrating an outline of a configuration of a refrigerator 20 as an embodiment of the present invention, and FIG. 2 is an external view illustrating an appearance of a cylinder 32 of the refrigerator 20. In the following description, “upper” and “lower” mean “upper” and “lower” in FIGS. 1 and 2, and the refrigerator 20 is actually arranged in the direction of FIGS. 1 and 2. Not necessarily.

  As shown in FIG. 1, the refrigerator 20 of the embodiment is configured as a Gifford McMahon refrigerator (GM refrigerator), and generates a cold with a compressor 22 that compresses a working fluid (for example, helium gas). The cold generator 30, the flow path 50 that connects the discharge side of the compressor 22 and the room temperature space Sh (described later) of the cold generator 30, the high-pressure valve 51 provided in the flow path 50, and the suction of the compressor 22 A flow path 52 connecting the side and the room temperature space Sh of the cold generation unit 30, a low pressure valve 53 provided in the flow path 52, a drive unit 60 that drives the cold generation unit 30, the high pressure valve 51, and the low pressure valve 53; And a control device 80 for controlling the entire refrigerator. The cold generating unit 30 includes a cylinder 32 and a displacer (piston) 40 that reciprocates within the cylinder 32.

  The cylinder 32 is cylindrical with a bottom and has a first cylinder part 33 having a hole 33 h at the center of the lower wall part (bottom part), and is connected to the lower wall part of the first cylinder part 33 coaxially with the first cylinder part 33. And is fixed to the outer periphery of the second cylinder part 34 having a bottomed cylindrical shape and a smaller diameter than the first cylinder part (inner circumference is the same diameter as the hole 33h) and the lower end of the side wall part of the first cylinder part 33. A cylindrical first cold head 35 and a cylindrical second cold head 36 fixed to the outer periphery of the lower end portion of the side wall portion of the second cylinder portion 34 are provided. The first cylinder part 33 and the second cylinder part 34 are made of stainless steel, for example. The first cold head 35 and the second cold head 36 are made of copper, for example. A flange portion 33 f is provided at the upper end portion (base end portion) of the first cylinder portion 33, and the flange portion 33 f is fixed to the lower side wall portion of the crankcase 70 of the drive unit 60.

  As shown in FIG. 2, on the outer periphery of a cylindrical portion (hereinafter referred to as “first non-enclosing portion 33a”) of the first cylinder portion 33 other than the flange portion 33f and not surrounded by the first cold head 35. Are provided with a main rib 33b continuous from the upper end to the lower end of the first non-enclosing portion 33a and at least one (for example, six) sub-ribs 33c that connect two different points of the main rib 33b. The main rib 33b is provided so as to be inclined with respect to the axial direction (vertical direction in FIG. 2) of the first cylinder portion 33, and specifically, provided in a spiral shape. The sub rib 33c extends in a direction different from the inclination direction of the main rib 33b with respect to the axial direction of the first cylinder portion 33, and is provided so as to connect two different points of the main rib 33b. In the embodiment, the main rib 33b and the sub rib 33c are formed integrally with the first non-enclosing portion 33a by cutting or the like. The main rib 33b and the sub rib 33c may be formed separately from the first non-enclosing portion 33a and joined to the outer periphery of the first non-enclosing portion 33a by brazing or the like. In this case, the main rib 33b is joined to the outer periphery of the first non-enclosing portion 33a so that an arc-shaped (for example, semicircular) member having a twist is spiraled as a whole, and the sub-rib 33c is twisted. It is good also as what is joined to the outer periphery of the 1st non-enclosing part 33a so that an arc-shaped member may connect two different points of the main rib 33b.

  From the upper end to the lower end of the second non-enclosed portion 34a on the outer periphery of a cylindrical portion of the second cylinder portion 34 that is not surrounded by the second cold head 36 (hereinafter referred to as “second non-enclosed portion 34a”). The main rib 34b that extends continuously over the main rib 34b and at least one (for example, six) sub-ribs 34c that connect two different points of the main rib 34b are provided. The main rib 34b is provided so as to be inclined with respect to the axial direction (vertical direction in FIG. 2) of the second cylinder portion 34, and specifically, provided in a spiral shape. The sub-rib 34c extends in a direction different from the inclination direction of the main rib 34b with respect to the axial direction of the second cylinder portion 34, and is provided so as to connect two different points of the main rib 34b. In the embodiment, the main rib 34b and the sub-rib 34c are formed integrally with the second non-enclosing portion 34a by cutting or the like. The main rib 34b and the sub-rib 34c may be formed separately from the second non-enclosing portion 34a and joined to the outer periphery of the second non-enclosing portion 34a by brazing or the like. In this case, the main rib 34b is joined to the outer periphery of the second non-enclosing portion 34a so that an arc-shaped member (for example, a semicircle) having a twist is spiraled as a whole, and the sub-rib 34c has a twist. The arc-shaped member may be joined to the outer periphery of the second non-enclosing portion 34a so as to connect two different points of the main rib 34b.

  As shown in FIG. 1, the displacer (piston) 40 is disposed in the first cylinder portion 33 and is connected to the hollow and cylindrical first piston portion 41, the first piston portion 41 and the second cylinder. A second piston part 42 that is disposed in a large part in the part 34 and that is smaller in diameter and hollow than the first piston part 41 and has a cylindrical shape is further provided. The 1st piston part 41 and the 2nd piston part 42 are formed, for example with resin. A first regenerator 43 is built in the first piston part 41, and a second regenerator 44 is built in the second piston part 42. The first regenerator 43 is composed of a plurality of wire mesh regenerators and the like. The second regenerator 44 is composed of a plurality of wire meshes, a fine spherical metal regenerator, a net-like member that prevents the reflow of the spherical metal regenerator, and the like.

  A communication hole 41 a that communicates the inside of the first piston part 41 (first regenerator 43) and the room temperature space Sh is formed in the upper side wall part of the first piston part 41, and the side wall part of the first piston part 41 A communication hole 41b for communicating the inside of the first piston portion 41 and the first expansion space Sc1 is formed on the lower end side. Here, the room temperature space Sh is a space formed above the first piston part 41 in the first cylinder part 33, and is mainly driven by the inner peripheral surface (the inner surface of the side wall part) of the first cylinder part 33 and the drive. The lower end surface of the crankcase 70 of the portion 60 (the outer surface of the lower side wall portion) and the upper end surface of the first piston portion 41 (the outer surface of the upper side wall portion) are formed. The flow path 50 and the flow path 52 described above are connected to the room temperature space Sh. The first expansion space Sc <b> 1 is a so-called first stage low-temperature space formed below the first piston portion 41 in the first cylinder portion 33, and mainly the inner peripheral surface ( The inner surface of the side wall portion and the bottom surface (the inner surface of the lower wall portion), the lower end surface of the first piston portion 41 (the outer surface of the lower wall portion), and the outer peripheral surface of the second piston portion 42 (the outer surface of the side wall portion). . A seal member 45 is attached to the outer peripheral surface of the first piston portion 41 (the outer surface of the side wall portion), and is interposed between the outer peripheral surface of the first piston portion 41 and the inner peripheral surface of the first cylinder portion 33. The working fluid is prevented from flowing in the room temperature space Sh and the first expansion space Sc1.

  A communication hole 42 a that communicates the inside of the second piston portion 42 (second regenerator 44) and the first expansion space Sc <b> 1 is formed in the upper side wall portion of the second piston portion 42. A communication hole 42b for communicating the inside of the second piston portion 42 and the second expansion space Sc2 is formed on the lower end side of the side wall portion. Here, the second expansion space Sc2 is a so-called second stage low-temperature space formed below the second piston portion 42 in the second cylinder portion 34, and mainly the inner peripheral surface of the second cylinder portion 34. (The inner surface of the side wall portion) and the bottom surface (the inner surface of the lower side wall portion) and the lower end surface of the second piston portion 42 (the outer surface of the lower side wall portion). A seal member 46 is attached to the outer peripheral surface of the second piston portion 42 (the outer surface of the side wall portion), and is interposed between the outer peripheral surface of the second piston portion 42 and the inner peripheral surface of the second cylinder portion 34. The working fluid is prevented from flowing in the first expansion space Sc1 and the second expansion space Sc2.

  The drive unit 60 includes a motor 61, a crankpin 63 that is eccentrically fixed to the output shaft 62 of the motor 61, and a crankcase 70. The motor 61 is configured as a synchronous motor or an induction motor, for example, and is driven and controlled by a drive circuit (not shown). The drive circuit includes a converter that converts power from an AC power source into DC power, and an inverter that converts DC power from the converter into three-phase AC power and supplies the same to the motor 61. The crankcase 70 is fixed to the case of the motor 61 and accommodates a part of the piston rod 48 connected to the upper side wall portion of the first piston portion 41 of the displacer 40, the output shaft 62 of the motor 61, the crankpin 63, and the like. To do. A through hole 71 into which the piston rod 48 is inserted is formed in the lower side wall portion of the crankcase 70, and the piston rod 48 is positioned in a vertical direction ( A recess 72 that is recessed upward from the inner surface is formed so as to allow movement in particular of the upper side. The piston rod 48 is supported by the crank pin 63 via a bearing 64 so as to be swingable around the crank pin 63, and a crank case 70 via a sliding bearing 65 so as to be movable in the vertical direction in the through hole 71. And is supported by the crankcase 70 via a sliding bearing 66 so that it can move in the vertical direction within the recess 72. In accordance with the rotation of the motor 61, the piston rod 48 connected to the crank pin 63 via the bearing 64 reciprocates in the vertical direction, and accordingly, the displacer 40 reciprocates in the cylinder 32 in the vertical direction.

  The drive unit 60 includes a cam (not shown) that is connected to the output shaft 62 or the crank pin 63 of the motor 61 and opens and closes the high-pressure valve 51 and the low-pressure valve 53. The high-pressure valve 51 and the low-pressure valve 53 open and close as follows according to the rotation of the motor 61. When the crank angle θcr when the crank pin 63 is at the lowest position (bottom dead center) is 0 degree, the crank angle θcr is in the range and angle from the angle θ1 (eg, −30 degrees) to the angle θ2 (eg, 30 degrees). In a range from θ3 (for example, 150 degrees) to an angle θ4 (for example, 210 degrees), both the high-pressure valve 51 and the low-pressure valve 53 are closed. When the crank angle θcr is in the range of the angle θ2 to the angle θ3, the high pressure valve 51 is open and the low pressure valve 53 is closed. When the crank angle θcr is in the range of the angle θ4 to the angle θ1, the high-pressure valve 51 is closed and the low-pressure valve 53 is in the low-pressure open state.

  The control device 80 is configured as a microprocessor including a CPU, a ROM, a RAM, and the like. Signals from various sensors necessary for operating the refrigerator 20 are input to the control device 80. The control device 80 outputs a drive control signal to the compressor 22 and a drive control signal to the motor 61 (inverter).

  In the refrigerator 20 configured as described above, when the crank angle θcr reaches the angle θ1, the both valves are closed according to the rotation of the motor 61, and then the high pressure is opened when the crank angle θcr reaches the angle θ2. In the valve state, the displacer 40 (the first piston portion 41 and the second piston portion 42) moves upward, and the working fluid from the compressor 22 passes through the flow path 50 (the high pressure valve 51) and the room temperature space Sh. Then, it flows into the first expansion space Sc1 and the second expansion space Sc2. At this time, the working fluid is cooled by the first regenerator 43 in the first piston part 41 and flows into the first expansion space Sc1, and further cooled by the second regenerator 44 in the second piston part 42. It flows into the second expansion space Sc2. Then, when the crank angle θcr reaches the angle θ3, the both valve closing state is reached, and when the crank angle θcr reaches the angle θ4 thereafter, the low pressure valve opening state occurs, the second expansion space Sc2 and the first expansion space are reached. A working fluid such as Sc1 flows to the compressor 22 side via the flow path 52 (low pressure valve 53), and the temperature of the working fluid decreases due to Simon expansion, so that the cold is generated in the second expansion space Sc2 and the first expansion space Sc1. Occur. At this time, the working fluid in the second expansion space Sc2 flows into the first expansion space Sc1 while cooling the second regenerator 44 in the second piston portion 42, and the working fluid in the first expansion space Sc1 is the first piston. The first regenerator 43 is cooled in the part 41 and flows to the compressor 22 side through the room temperature space Sh and the flow path 52. Then, while the displacer 40 (the first piston portion 41 and the second piston portion 42) moves downward, the working fluid in the second expansion space Sc2 and the first expansion space Sc1 is further compressed via the flow path 52. It flows to the machine 22 side. Thus, the periphery of the first cold head 35 (first stage cooling stage) is set to about 30K to 75K, and the vicinity of the second cold head 36 (second stage cooling stage) is set to about several K to 20K to perform the first cooling. The cooling target placed on the stage or the second cooling stage is cooled (exhibits refrigeration performance).

  In such a refrigerator 20, in order to suppress heat inflow from the upper end portion (high temperature side end portion) to the lower end portion (low temperature side end portion) of the first and second cylinder portions 33, 34, The side wall portions (including the first and second non-enclosed portions 33a and 34a) of the two cylinder portions 33 and 34 are required to be as thin as possible. However, if the thickness of the side wall portions of the first and second cylinder portions 33 and 34 is reduced, the rigidity is lowered, and deformation (bending deformation or the like) of the first and second cylinder portions 33 and 34 is likely to occur. There are challenges. In consideration of this, in the embodiment, the first and second non-enclosed portions 33a and 34a are arranged on the outer periphery of the first and second non-enclosed portions 33a and 34a of the first and second cylinder portions 33 and 34 of the cylinder 32. The spiral main ribs 33b and 34b that continue from the upper end to the lower end of the main ribs 33 and at least one sub-rib 33c and 34c that connect two different points of the main ribs 33b and 34b are provided. Thus, by providing the main ribs 33b and 34b on the outer periphery of the first and second non-enclosing portions 33a and 34a, the main ribs 33b and 34b and the sub-ribs 33c and 34c among the side walls of the first and second cylinder portions 33 and 34 are provided. Even if the thickness of the portion where no is provided (hereinafter referred to as “non-rib portion”) is reduced, the rigidity of the first and second cylinder portions 33, 34 can be ensured by the main ribs 33b, 34b. As a result, the vibration resistance of the first and second cylinder parts 33 and 34 against the vibration caused by the pressure fluctuation in the first and second cylinder parts 33 and 34, the vibration of the cooling target, and the vibration of the drive part 60 is increased. Deformation of the first and second cylinder parts 33 and 34 can be suppressed. Moreover, since the thickness of the non-rib portion of the first and second cylinder portions 33 and 34 can be reduced, the heat inflow from the upper end portion to the lower end portion of the first and second cylinder portions 33 and 34 is suppressed. And good refrigeration performance can be ensured. That is, it is possible to achieve both the rigidity of the first and second cylinder portions 33 and 34 and the good refrigeration performance of the refrigerator 20. In addition, by providing sub-ribs 33c and 34c in addition to the main ribs 33b and 34b on the outer periphery of the first and second non-enclosed portions 33a and 34a, the first and second non-enclosed portions 33a and 34a can be compared with the case where only the main ribs 33b and 34b are provided. The rigidity of the cylinder portions 33 and 34 can be further increased. In other words, when the first and second cylinder portions 33 and 34 have the same rigidity, the thickness of the non-rib portion of the first and second cylinder portions 33 and 34 can be reduced. Further, since the main ribs 33b and 34b are provided in a spiral shape (so as to be inclined with respect to the axial direction of the first and second cylinder portions 33 and 34), the main ribs 33b and 34b are formed from the upper ends of the first and second cylinder portions 33 and 34. The distance of the main ribs 33b, 34b to the lower end can be increased, and heat inflow from the upper end to the lower end can be further suppressed.

  In the refrigerator 20 of the embodiment described above, the first and second non-enclosed portions 33a, 33a, 34a are disposed on the outer periphery of the first and second non-enclosed portions 33a, 34a of the first and second cylinder portions 33, 34 of the cylinder 32. Spiral main ribs 33b and 34b that are continuous from the upper end to the lower end of 34a are provided. As a result, it is possible to ensure both the rigidity of the first and second cylinder portions 33 and 34 and the good refrigeration performance of the refrigerator 20. Moreover, in addition to the main ribs 33b and 34b, at least one sub-ribs 33c and 34c that connect two different points of the main ribs 33b and 34b are also provided on the outer periphery of the first and second non-enclosing portions 33a and 34a. Thereby, the rigidity of the 1st, 2nd cylinder parts 33 and 34 can be made higher.

  In the refrigerator 20 of the embodiment, one spiral main ribs 33b and 34b are provided on the outer circumferences of the first and second non-enclosed portions 33a and 34a of the first and second cylinder portions 33 and 34 of the cylinder 32, respectively. However, a plurality of spiral main ribs may be provided.

  In the refrigerator 20 of the embodiment, the main ribs 33b and 34b and the sub ribs 33c and 34c are provided on the outer periphery of the first and second non-enclosed portions 33a and 34a of the first and second cylinder portions 33 and 34 of the cylinder 32. However, only the main ribs 33b and 34b may be provided without providing the sub-ribs 33c and 34c.

  In the refrigerator 20 of the embodiment, the cylinder 32 includes first and second cylinder portions 33 and 34 and first and second cold heads 35 and 36, and the first of the first and second cylinder portions 33 and 34. The spiral main ribs 33b and 34b that are continuous from the upper end to the lower end of the first and second non-enclosed portions 33a and 34a on the outer periphery of the second non-enclosed portions 33a and 34a are different from the main ribs 33b and 34b. At least one sub-rib 33c, 34c that communicates points is provided. However, as shown in the cylinder 132 of FIG. 3, the first and second cold heads are not provided, and the non-enclosed portions 133 a, 133 a, Spiral main ribs 133b, 134b that continue from the upper end to the lower end of 134a and at least one sub-rib 133c, 134c that connects two different points of the main ribs 133b, 134b may be provided. The sub-ribs 133c and 134c may not be provided.

  In the refrigerator 20 of the embodiment, the upper ends of the first and second non-enclosed portions 33a and 34a are arranged on the outer periphery of the first and second non-enclosed portions 33a and 34a of the first and second cylinder portions 33 and 34 of the cylinder 32. The spiral main ribs 33b and 34b that are continuous from the bottom to the bottom are provided. However, as shown in the cylinder 232 of FIG. 4, on the outer periphery of the non-enclosed portions 233 a and 234 a of the first and second cylinder portions 233 and 234, from the upper end to the lower end of the first and second non-enclosed portions 233 a and 234 a. The main ribs 233b and 234b may be provided so as to extend slightly inclined with respect to the axial direction of the first and second cylinder portions 233 and 234. Further, on the outer periphery of the non-enclosed portions 233a and 234a, the first and second non-enclosed portions 233a and 234a extend from the upper end to the lower end along the axial direction of the first and second cylinder portions 233 and 234. Main ribs 233b and 234b may be provided. In these cases, as with the refrigerator 20, sub-ribs may be provided.

  In the refrigerator 20 of the embodiment, the upper ends of the first and second non-enclosed portions 33a and 34a are arranged on the outer periphery of the first and second non-enclosed portions 33a and 34a of the first and second cylinder portions 33 and 34 of the cylinder 32. The spiral main ribs 33b and 34b that are continuous from the bottom to the bottom are provided. However, as shown in the cylinder 332 of FIG. 5, annular annular ribs 333 b 1 to 333 b 3, 334 b 1 to 334 b 3 are formed on the outer circumferences of the first and second non-enclosed portions 333 a and 334 a of the first and second cylinder portions 233 and 234. Ribs 333c1 to 333c4 and 334c1 to 334c4 may be provided. The annular ribs 333b1 to 333b3 are spaced apart from each other in the axial direction of the first cylinder portion 333. The annular ribs 334b1 to 334b3 are provided at intervals in the axial direction of the second cylinder portion 334. The ribs 333c1 and 334c1 extend from the annular ribs 333b1 and 334b1 to the upper ends of the first and second non-enclosed portions 333a and 334a with a slight inclination with respect to the axial direction of the first and second cylinder portions 233 and 234. . The ribs 333c2 and 334c2 are arranged from positions different from the connection positions of the annular ribs 333b1 and 334b1 to the ribs 333c1 and 334c1 in the circumferential direction of the first and second cylinder parts 333 and 334 to the annular ribs 333b2 and 334b2. The second cylinder portions 333 and 334 extend slightly inclined with respect to the axial direction. The ribs 333c3 and 334c3 are arranged from positions different from the connection positions of the annular ribs 333b2 and 334b2 to the ribs 333c2 and 334c2 in the circumferential direction of the first and second cylinder portions 333 and 334 to the annular ribs 333b3 and 334b3. The second cylinder portions 333 and 334 extend slightly inclined with respect to the axial direction. The ribs 333c4 and 334c4 are arranged at first and second non-enclosing portions 333a from positions different from the connection positions of the annular ribs 333b3 and 334b3 with the ribs 333c3 and 334c3 in the circumferential direction of the first and second cylinder portions 333 and 334. , 334a extends slightly inclined with respect to the axial direction of the first and second cylinder portions 233, 234. The ribs 333c1 to 333c4 and 334c1 to 334c4 may extend along the axial direction of the first and second cylinder portions 333 and 334.

  The refrigerator 20 of the embodiment is configured as a two-stage GM refrigerator, but may be configured as a one-stage GM refrigerator, or configured as a three-stage or more GM refrigerator. It may be a thing.

  The refrigerator 20 of the embodiment is configured as a GM refrigerator, but may be configured as a Stirling refrigerator.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the cylinders (first and second cylinder portions 33 and 34) correspond to “cylinders”, and the main ribs 33b and 33c correspond to “ribs”. The sub ribs 33c and 34c correspond to “sub ribs”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problem should be made based on the description of the column, and the embodiment of the invention described in the column of means for solving the problem is described. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

  The present invention can be used in the refrigerator manufacturing industry and the like.

20 Refrigerator, 22 Compressor, 30 Chill generating part, 32, 132, 232, 332 Cylinder, 33, 133, 233, 333 First cylinder part, 33a, 133a, 233a, 333a First non-enclosing part, 33b, 34b 133b, 134b, 233b, 234b Main rib, 33c, 34c, 133c, 134c Sub-rib, 33f Flange, 33h Hole, 34, 134, 234, 334 Second cylinder, 34a, 134a, 234a, 334a Second non-enclosing portion , 35 1st cold head, 36 2nd cold head, 40 displacer, 41 1st piston part, 41a, 41b, 42a, 42b communication hole, 42 2nd piston part, 43 1st regenerator, 44 2nd regenerator, 45, 46 Seal member, 48 Piston rod, 50, 52 Flow path, 51 High pressure bar 53, low pressure valve, 60 drive unit, 61 motor, 62 output shaft, 63 crank pin, 64 bearing, 65, 66 slide bearing, 70 crank case, 71 through hole, 72 recess, 80 controller, 333b1-333b3, 334b1 ˜334b3 annular rib, 333c1 to 333c4, 334c1 to 334c4 rib, Sh room temperature space, Sc1 first expansion space, Sc2 second expansion space.

Claims (5)

A refrigerator that generates cold on one end side of a cylindrical cylinder,
The outer periphery of the cylinder is provided with a rib that extends from the one end side to the other end side.
refrigerator. The refrigerator according to claim 1,
The rib is provided so as to be inclined with respect to the axial direction of the cylinder.
refrigerator. The refrigerator according to claim 2,
The rib is provided in a spiral shape,
refrigerator. A refrigerator according to any one of claims 1 to 3,
The outer periphery of the cylinder is further provided with a sub-rib that connects two different points on the rib.
refrigerator. A refrigerator according to any one of claims 1 to 4, wherein
A cold head is fixed to the one end side of the cylinder,
The rib is provided on an outer periphery of a portion of the cylinder that is not surrounded by the cold head.
refrigerator.

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