KR20110097066A - Cooler - Google Patents

Abstract

The cryogenic freezer according to the present invention is a cylindrical cylinder that forms a compression space; A displacer housing in axial communication with the cylinder; A piston reciprocating linearly in the axial direction inside the cylinder; A displacer located inside the piston center and the displacer housing and interlocked in a direction opposite to the piston; A plurality of through holes processed in the displacer housing to penetrate the inside and the outside of the displacer housing; And, since the groove portion provided on the inner peripheral surface of the displacer housing to include the through holes; it can reduce the amount of burrs generated as the through holes are processed in a relatively thin portion, even if the burrs are generated by processing Since it is accommodated in the groove inside the housing, it is possible to remove the burr easily, as it is not necessary to precisely remove the burr.

Description

Cryogenic Freezers {COOLER}

The present invention relates to a cryogenic freezer, and more particularly, to a cryogenic freezer capable of easily processing a burr even when burrs are generated by processing holes in the displacer housing.

In general, the cryogenic freezer is a low vibration high reliability freezer used to cool small electronic parts or superconductors, and a working fluid such as helium or hydrogen generates a freezing output through a process of compression and expansion. Stirling refrigerators, GM refrigerators or Joule-Thomson refrigerators are widely known. These refrigerators have a problem in that their lubrication is deteriorated during high-speed operation as well as a separate lubrication for the wear of the friction portion during operation. Therefore, there is a need for a cryogenic freezer that maintains reliability even at high speeds and does not require long-term maintenance without additional lubrication. In recent years, a high-pressure working fluid acts as a kind of bearing to reduce friction between components. Lubricated cryogenic freezers are being applied.

The cryogenic refrigerator is pumped while compressing the refrigerant in a compression space, undergoes a heat dissipation and regeneration process, and then expands in the expansion space, and is configured to maintain the cryogenic temperature through heat exchange with the surroundings. At this time, a cylindrical cylinder and a displacer housing communicating with the cylindrical shape are provided to form a compression space, and the piston and the displacer are installed inside the cylinder and the displacer housing so as to reciprocate linearly. Of course, the refrigerant compressed in the compression space flows along a predetermined flow path, that is, inside the cylinder which is the compression space, outside the cylinder and the displacer housing, and the inside of the displacer. It is provided to penetrate in the direction, the through-hole through which the inner / outer communication also in the displacer housing is provided to penetrate in the radial direction.

However, since the conventional cryogenic freezer manufactures a cylindrical displacer housing integrally like a cylinder, and then forms a plurality of holes on the outer circumferential surface of the displacer housing, burrs generated during processing are displaced. In addition to remaining on the inner peripheral surface of the housing there is a problem that a precise process is required to completely remove the burr.

The present invention has been made to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a cryogenic freezer that can easily handle the burrs generated by processing the through hole in the displacer housing.

Cryogenic freezer according to the present invention for solving the above problems is a cylindrical cylinder to form a compression space; A displacer housing in axial communication with the cylinder; A piston reciprocating linearly in the axial direction inside the cylinder; A displacer located inside the piston center and the displacer housing and interlocked in a direction opposite to the piston; A plurality of through holes processed in the displacer housing to penetrate the inside and the outside of the displacer housing; And a groove provided on the inner circumferential surface of the displacer housing so as to include the through holes.

Further, in the present invention, the through holes are arranged at intervals in the circumferential direction of the displacer housing, the groove portion is characterized in that the ring-shaped groove.

In the present invention, the through hole is characterized in that the slot is formed long in the circumferential direction of the displacer housing.

In addition, in the present invention, the displacer includes a displacer rod having a displacer rod engaged with the center of the piston, a through-hole disposed on the inner circumferential surface of the displacer housing and having a groove provided on the outer circumferential surface to include the same; The groove of the displacer housing may be accommodated inside the groove of the displacer body even if the displacer moves in a reciprocating linear motion.

The cryogenic freezer according to the present invention configured as described above has a burr because it is accommodated in a groove-shaped groove provided inside the displacer housing even if a burr is generated by processing the through holes to radially penetrate the cylindrical displacer housing. Even if it is generated, it is possible to reduce the occurrence of the burr, and because it is possible to remove the burr without precision, there is an advantage that can easily remove the burr.

1 is a side view showing an example of a cryogenic freezer according to the present invention.
Figure 2 is a side cross-sectional perspective view showing an example of the cryogenic freezer according to the present invention.
Figure 3 is a side cross-sectional view showing an example of the cryogenic freezer according to the present invention.
Figure 4 is a side cross-sectional view showing an example of a fixing member of the cryogenic freezer according to the present invention.
5 is a cross-sectional view taken along line AA of FIG. 4.
Figure 6 is a side cross-sectional view showing an example mounted on the fixing member of the cryogenic freezer according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 is a view showing an example of the cryogenic freezer according to the present invention.

One example of the cryogenic freezer according to the present invention is a case (10) to form an external appearance, as shown in Figures 1 to 3, the fixing member 20 is fixed in the case 10 to form a predetermined space, The movable member 30 is installed between the case 10 and the fixed member 20 to compress and expand the refrigerant while reciprocating linear movement in the compression space C in the fixed member 20 in the axial direction. A linear motor 40 driving the linear motor 40, a regenerator 50 coupled to the axial direction of the movable member 30, and a regenerator 50 which is equally regenerated between the refrigerant flowing in opposite directions. The radiating unit 60, which radiates heat of the refrigerant compressed and compressed around the movable member 30 and the regenerator 50 to the outside, is combined to form an expansion space E in the axial direction of the regenerator 50, and expands. The refrigerant is made up of a cooling unit 70 for absorbing external heat.

The case 10 includes a frame concentric with the regenerator 50, the heat dissipation unit 60, and the cooling unit 70, and a cylindrical shell tube fixed to the axial direction of the frame 11. tube: 12). The portion of the frame 11 to which the fixing member 20 is bolted is formed to have a thicker thickness than the shell tube 12 even though the diameter is smaller than that of the shell tube 12. To increase the thickness is formed thinner. The shell tube 12 is provided with a predetermined tube 13, and the inside of the case 10 maintains a vacuum state close to 100%, and then injects a refrigerant such as genuine He gas to form a vacuum state. In order to bleed air or to inject a refrigerant 13 is provided. In addition, the shell tube 12 is provided with a power supply terminal 14 for supplying power supplied to the linear motor 40.

The fixing member 20 is fixed to the frame 11 and extends from the cylinder 21 to the inside of the shell tube 12 and the displacer housing extending from the cylinder 21 to engage the inside of the frame 11. displacer housing (22). The cylinder 21 and the displacer housing 22 are formed in a stepped cylindrical shape. The diameter of the displacer housing 22 is smaller than that of the cylinder 21, and the connecting portion is extended on the outer circumferential surface of the cylinder 21. This frame 11 is bolted. At this time, the cylinder 21 and the displacer housing 22 form a compression space C in which the refrigerant is compressed. The through holes 21h and 22h communicate with the inside of the heat dissipation unit 60, respectively.

The movable member 30 includes a piston 31 reciprocating linearly in the cylinder 21 and a displacer 32 reciprocating linearly in conjunction with the piston 31 in the displacer housing 22. It includes. The piston 31 includes a piston body 311 provided with a gap on the inner circumferential surface of the cylinder 21, and a piston plug 312 provided inside the piston body 311. The displacer 32 includes a displacer rod 321 which is pierced through the center of the piston plug 312 and is bufferably supported by the leaf spring S fixed to the case 10, and the displacer housing ( It is composed of a displacer cover (322) to form a predetermined space in which the refrigerant flows by being accommodated / coupled to the displacer body (321a), which is an end of the displacer rod 321 embedded in the 22). A compression space C is formed between the piston 31 and the displacer body 321a. At this time, the displacer body 321a is formed with a U-shaped cross section and is provided with first and second through holes 321h and 321H communicating with the inside of the heat dissipation unit 60. In addition to the displacer valve 323 opened and closed by a pressure difference, a suction hole (not shown) communicating with the regenerator 50 is provided with a through hole 322H communicating with the inside of the displacer body 321a.

On the other hand, since the movable member 30 is a reciprocating linear motion, in addition to the leaf spring (S), a gas bearing capable of lubricating the components friction with each other is applied, it can be configured as follows. A plurality of storage grooves formed in the circumferential direction along the outer circumferential surface of the piston plug 312 to communicate with the flow path 312a provided in the axial direction of the piston plug 312 so that the refrigerant in the compression space (C) ( 312b is provided, and a plurality of radially penetrating the piston body 311 to supply the refrigerant stored in the storage groove 312b of the piston plug 312 into the space between the piston body 311 and the cylinder 21 The hole 311h is provided and radially of the piston plug 312 to supply the refrigerant stored in the storage groove 312b of the piston plug 312 into the space between the piston plug 312 and the displacer rod 321. A plurality of through holes 312h are provided. Of course, in order to guide the refrigerant stored in the storage groove 312b of the piston plug 312 to the hole 311h of the piston body 311 or the hole 312h of the piston plug 312, the outer peripheral surface of the piston plug 312 Various types of grooves (not shown) are provided in the circumferential direction or the axial direction.

The linear motor 40 includes a cylindrical inner stator 41 fixed to the outer circumferential surface of the cylinder 21, and a cylindrical outer stator fixed to the inner circumferential surface of the shell tube 12 so as to maintain a constant distance outside the inner stator 41. an outer stator 42 and a permanent magnet 43 connected to the piston body 311 so as to maintain a gap between the inner stator 41 and the outer stator 42. Of course, the outer stator 42 has a plurality of core blocks 412 mounted on the coil winding 411, and the coil winding 411 is connected to the power supply terminal 14 on the case 10 side. .

The regenerator 50 includes a cylindrical regeneration housing 51 coupled to the displacer housing 321a, a heat storage material 52 inserted into a portion of the displacer housing 321a and the regeneration housing 51, and a regeneration housing. (51) It consists of an end cap (53) attached to cover the end part, and is comprised so that a refrigerant | coolant can pass through the heat storage material 52 and the end cap 53. As shown in FIG. The heat storage material 52 receives and accumulates and returns energy during heat exchange with the refrigerant gas, and thus, the heat storage material 52 has a large heat exchange area and specific heat, a small thermal conductivity coefficient, and is preferably made of a material having uniform breathability. For example, it may be configured in a form in which fine threads are aggregated.

The heat dissipation unit 60 is composed of a cylindrical base 61 and a plate-like fin 62 arranged densely in the circumferential direction thereof, and is formed of a metal material such as copper having high heat transfer efficiency.

The cooling unit 70 is mounted at the end of the regenerator 50 to form an expansion space E between the end cap 53 and maintains the cryogenic temperature through a heat exchange action. Of course, the cooling unit 70 may be configured to form a larger surface area for heat exchange between the refrigerant inside and the outside air.

In addition, reference numeral 80, which is not shown, denotes a passive balancer, which reduces vibrations generated during operation of the cryogenic freezer.

Looking at the operation of the cryogenic freezer configured as described above, as follows.

First, when a current is supplied to the outer stator 42 through the power supply terminal 14, mutual electromagnetic force is generated between the inner stator 41, the outer stator 42, and the permanent magnet 43, and the permanent force is generated by the electromagnetic force. The magnet 43 is reciprocated linearly. At this time, since the permanent magnet 43 is connected to the piston body 311 and the piston plug 312 engaged therewith, the piston 31 moves reciprocally linearly with the permanent magnet 43. Therefore, when the piston 31 reciprocates linearly in the cylinder 21, the displacer 32 moves in the opposite direction to the movement of the piston 31 by the inertial force and is elastically supported by the leaf spring S. .

Accordingly, the refrigerant is compressed in the compression space C inside the cylinder 21 by the reciprocating linear motion of the piston 31 and the displacer 32 and passes through the through hole 21h of the cylinder 21 to form the frame 12. Pass through the inside is subjected to an isothermal compression process that is radiated by the heat dissipation unit (60). Thereafter, the refrigerant having undergone isothermal compression flows into the regenerator 50 through the through hole 22h of the displacer housing 22 and the first through hole 321h of the displacer body 321a, and flows in opposite directions. It undergoes an equal recovery process while exchanging heat with the refrigerant. Thereafter, the refrigerant having undergone the isotropic regeneration process exits and expands into the expansion space E and undergoes an isothermal expansion process in which the cooling unit 70 cools the outside air. Thereafter, the refrigerant having undergone the isothermal expansion process is introduced again into the regenerator 50 and then subjected to the isotropic regeneration process that is regenerated by the refrigerant flowing in the opposite direction as described above. At this time, after passing through the displacer body 321a and the displacer cover 322 through the inlet port and the displacer valve 323 provided in the displacer cover 322, the refrigerant may pass through the through hole of the displacer cover 322 ( 322H and the second through hole 321H of the displacer body 321a are introduced into the compression space C again. Of course, while the linear motor 40 is operated, the above isothermal compression process, isotropic regeneration process, isothermal expansion process, and isotropic regeneration process are repeated in sequence, and the cryogenic cooling is performed in the cooling unit 70.

4 is a side cross-sectional view showing an example of a fixing member of the cryogenic freezer according to the present invention, Figure 5 is a cross-sectional view taken along the line A-A of FIG.

Looking at the fixing member of the cryogenic freezer according to the present invention in more detail with reference to Figures 4 to 5, at the same time the cylindrical cylinder 21 and the cylindrical displacer housing 22 having a smaller diameter is connected stepwise When the caster housing 22 is integrally manufactured to be provided with a groove-shaped groove portion 22a on the inner circumferential surface thereof, and then a plurality of through holes 22h are processed along the groove portion 22a of the displacer housing 22, The burr generated in the can be accommodated in the groove portion 22a or can be easily removed.

The cylinder 21 is formed in a cylindrical shape in which a compression space is formed therein, and a flange portion 21a is provided on an outer circumferential surface thereof and is bolted to the frame 12 (shown in FIG. 3) described above. At this time, a plurality of through holes 21h are formed to allow the refrigerant to escape from the compression space inside the cylinder 21, and the through holes 21h are circumferentially formed in the stepped portions of the cylinder 21 and the displacer housing 22. It is formed to penetrate in the axial direction at regular intervals in the direction. Of course, since the refrigerant exiting the through holes 21h of the cylinder 21 is radiated from the radiator 60 (shown in FIG. 3) located in the radial direction as described above, the through holes 21h of the cylinder 21 are included. Is inclined in the outer diameter direction from the center to guide the flow to the heat dissipation unit (60).

The displacer housing 22 is formed in a cylindrical shape stepped from the cylinder 21. In order to prevent the leakage of the refrigerant on the outer circumferential surface, the O-ring is placed at a part of the displacer housing 22 which is in contact with a component such as the frame 12 described above. Leakage preventing grooves 22b that can be inserted are provided. At this time, a plurality of through holes 22h are formed to allow the refrigerant outside the displacer housing 22 to flow into the inside, and the through holes 22h are ring-shaped grooves provided on the inner circumferential surface of the displacer housing 22. It is formed so as to penetrate radially at a predetermined interval in the circumferential direction 22a), the through holes 22h is composed of a plurality of slots (long) formed in the circumferential direction. Of course, the displacer housing 22 is cast to have a groove-shaped groove 22a on the inner circumferential surface, and then the through holes 22h having a smaller size than the groove portion 22a are provided on the outer circumferential surface of the displacer housing 22. It processes so that it may be located on (22a). Therefore, since the groove portion 22a is formed relatively thin in the displacer housing 22, the amount of burrs generated even when the through holes 22h are processed in the groove portion 22a is small. Of course, since the displacer body 321a (shown in FIG. 3) reciprocates linearly in contact with the inner circumferential surface of the displacer housing 22, the burr generated on the inner circumferential surface of the displacer housing 22 should be removed. At this time, even if a burr is generated inside the displacer housing 22, since the burr is accommodated in the groove part 22a having a groove shape, the burr may be easily removed as the burr may not be precisely processed to remove the burr.

Figure 6 is a side cross-sectional view showing an example mounted on the fixing member of the cryogenic freezer according to the present invention.

First, when the displacer body 321a is mounted inside the displacer housing 22, the through holes 22h of the displacer housing 22 communicate with the through holes 321h of the displacer body 321a in a stationary state. It is installed as possible. At this time, the displacer body 321a communicates with the through holes 321h of the displacer body 321a even though the displacer body 22 reciprocates linearly in the displacer housing 22. Preferably, for this purpose, a groove portion 321h 'including the through holes 321h of the displacer body 321a is uniformly axially in consideration of the stroke of the displacer body 321a on the outer circumferential surface of the displacer body 321a. It is formed beyond its length. Therefore, even if the displacer body 321a moves reciprocally linearly in the displacer housing 22, the through holes 22h of the displacer housing 22 are accommodated inside the groove portion 321h 'of the displacer body 321a. It is preferable that the size is determined.

In addition, the inner circumferential surface of the displacer housing 22 is provided with a groove portion 22a including the through holes 22h so that a kind of burr generated while processing the through holes 22h can be accommodated as described above. Similarly, the through holes 22h and the grooves 22a of the displacer housing 22 must communicate with the through holes 321h and the grooves 321h 'of the displacer body 321a. Therefore, even if the displacer body 321a reciprocates linearly in the displacer housing 22, the groove 22a of the displacer housing 22 is accommodated inside the groove 321h 'of the displacer body 321a. It is desirable for the size to be determined.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

Claims (4)

A cylindrical cylinder forming a compression space;
A displacer housing in axial communication with the cylinder;
A piston reciprocating linearly in the axial direction inside the cylinder;
A displacer located inside the piston center and the displacer housing and interlocked in a direction opposite to the piston;
A plurality of through holes processed in the displacer housing to penetrate the inside and the outside of the displacer housing; And,
Cryogenic freezer comprising a; a groove provided on the inner peripheral surface of the displacer housing to include the through-holes. The method of claim 1,
The through holes are arranged at intervals in the circumferential direction of the displacer housing,
Cryogenic freezer, characterized in that the groove is a ring-shaped groove. The method of claim 2,
The through-hole is a cryogenic freezer, characterized in that the slot is formed long in the circumferential direction of the displacer housing. The method of claim 2,
The displacer includes a displacer rod having a displacer rod engaged with the center of the piston, a through hole disposed on an inner circumferential surface of the displacer housing and penetrating through the inner and outer sides thereof, and a groove provided on the outer circumferential surface thereof.
Cryogenic freezer, characterized in that the groove portion of the displacer housing is accommodated inside the groove portion of the displacer body even if the displacer reciprocates linearly.

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