KR100333397B1 - Stirring Refrigerator - Google Patents

Abstract

The present invention relates to a sterling refrigerator, the purpose of which is to compact the product by reciprocating the piston with the displacer using one drive rod to reduce the mechanical friction loss of the drive rod and to prevent the outflow of the working fluid It is.

According to the Stirling refrigerator according to the present invention, by installing the linear motor 60, the piston 30 and the displacer 20 in series in the case 10 and the filling space portion 13, the inner space is filled with the working fluid and It is divided into a compression space 12 and an expansion space 11, the displacer using a drive rod 22 axially penetrating the central portion of the piston 30 and reciprocating by the linear motor 60 ( By driving 20 and the piston 30, there is an advantage that the product can be made compact. In addition, since the seal bearing 40 is installed at the center of the piston 30 so as to support the sliding motion of the driving rod 22 and may be freely spaced in a direction perpendicular to the direction of movement, the movement of the driving rod 22 is smoothly made. Of course, the efficiency of the Stirling refrigerator is improved, there is an effect that can prevent the working fluid in the compression space 12 to flow out to the filling space 13 side.

Description

Stirring Freezer

The present invention relates to a sterling refrigerator, and more particularly, a sterling refrigerator having a reciprocating piston and a seal bearing member for supporting the displacer driving rod passing therein so as to reciprocate while maintaining coaxiality. It is about.

Generally, a sterling refrigerator is a device that generates a freezing output through a process such as expansion-compression of a working fluid such as helium or hydrogen, and is applied to a product capable of storing food such as a refrigerator. Figure 1 schematically shows a conventional sterling freezer.

As shown in the related art, the conventional sterling refrigerator has a pair of displacers 2 so as to partition the inside of the container 1 filled with a working fluid such as helium or hydrogen gas into an expansion space 6 and a compression space 7. The piston 3 is provided, and the regeneration means 8 is provided between the expansion space 6 and the compression space 7.

The regeneration means 8 includes a high temperature space portion 8c for dissipating heat by a compression action of the working fluid, a low temperature space portion 8a for absorbing heat by expansion of the working fluid, and interposed therebetween to accumulate heat. It consists of a regenerator 8b, etc., the low temperature space portion 8a communicates with the expansion space 6 through the first pipe 8d, and the high temperature space portion 8c is the compressed space through the second pipe 8e. It is linked with (7).

The displacer 2 and the piston 3 are connected to the crankshaft 4 and the connecting rods 2c and 3b which are rotated by the drive motor 5, so that the container when the drive motor 5 rotates. (1) Up and down reciprocating motion with constant phase difference inside, its detailed structure is as follows.

First, the crankshaft 4 is built in the horizontal direction in the lower portion of the container (1), one end of the connecting rod (3b) is coupled to the piston (3) to be rotated by a predetermined angle through the rolling pin (3a), the connecting rod ( The other end of 3b) is engaged with the crankshaft 4. The displacer 2 is provided with an extension rod 2a extending between the pair of pistons 3, and the lower end of the extension rod 2a is provided with a rolling pin 2b and a connecting rod 2c. Coupling with the crankshaft (4). At this time, since the connecting rod 2c for connecting the displacer 2 and the connecting rod 3b for connecting the piston 3 are disposed to be offset from each other, the displacer 2 and the piston 3 have a constant phase difference. Will work with.

When the driving motor 5 is driven in the Stirling refrigerator configured as described above, the piston 3 and the displacer 2 connected through the respective connecting rods 2c and 3b according to the rotational motion of the crankshaft 4 are compressed space. (7) and the expansion space (6) reciprocate.

Accordingly, the expansion space 6 and the compression space 7 is variable in volume, and the working fluid filled by the volume change thereof is isothermally compressed and isothermally expanded. Subsequently, the working fluid of the expansion space 6 is supplied and expanded to the low temperature space portion 8a to absorb heat, thereby cooling the heat medium (not shown) of the heat exchange means (not shown).

The working fluid of the compression space 7 is supplied and compressed to the high temperature space 8c to release heat filled in the absorbing member (not shown) of the heat exchange means (not shown).

However, in this conventional sterling refrigerator, a plurality of connecting rods 2c and 3b and rolling pins 2b to reciprocate the displacer 2 and the piston 3 in the compression space 7 and the expansion space 6. Since 3a, the crankshaft 4, and the like are mounted, there is a problem that excessive vibration and noise are generated due to the operation of the respective connecting portions.

That is, the displacer 2 and the piston 3 are connected to each of the refracted crankshafts 4 through the connecting rods 2c and 3b to be rotated at a predetermined angle so as to operate with a constant phase difference. It takes a long time, the drive motor 5 for driving the crankshaft 4 is exposed to the outside of the container 1, the appearance is not beautiful, there are various problems that the overall product size is enlarged.

The present invention is to solve this problem, an object of the present invention is to install a linear motor, a piston and a displacer in a casing in order to partition the inner space into a filling space and a compression space and the expansion space filled with the working fluid To provide a Stirling Refrigerator capable of compacting the product by driving the displacer and the piston using a driving rod axially penetrating the center of the piston and reciprocating by a linear motor.

Another object of the present invention is to support the sliding movement of the driving rod in the center of the piston and to install the seal bearing so as to flow in a direction perpendicular to the direction of movement, thereby reducing the mechanical frictional loss of the driving rod to smooth its movement It is to provide a Stirling Refrigerator that can prevent the working fluid from flowing out to the filling space side.

1 is a configuration diagram schematically showing a conventional sterling refrigerator.

2 is a schematic view of a sterling freezer according to the present invention.

3 is an exploded perspective view showing only the piston structure according to the present invention.

Figure 4 is an enlarged cross-sectional view showing the internal structure of the piston according to the present invention.

Figure 5 shows a seal bearing structure according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10. Case 20. Display 22. Drive rod

30. Piston 32. Insertion hole 33. Bearing cover

40..Seal bearing 41..Step 42..Coil spring

60..Linear motor

The present invention for achieving this object is;

A case in which an inner space is provided to compress and expand the working fluid, a piston cylinder disposed in the middle of the case to partition the inner space from side to side, and a space on one side of the case partitioned by the piston cylinder into an expansion space portion and a compression space portion. The distal end portion of the displacer cylinder coaxially disposed with the piston cylinder and the linear motor disposed in the other space of the case to form a filling space between the piston cylinder and the displacer cylinder according to the drive of the linear motor according to the drive of the linear motor. In a displacer provided with a drive rod connected to a linear motor, a stirling refrigerator having a piston having a hollow portion in a central portion through which the drive rod slidably moves in an axial direction so as to move forward and backward in the piston cylinder according to the movement of the displacer.

The piston is fitted to one side of the hollow portion of the piston through which the drive rod penetrates to support the sliding motion of the drive rod, and seal bearing and seal bearing made of a cylindrical pipe shape to prevent the working fluid from the compressed space from leaking into the filling space. It is characterized by having a bearing cover coupled to cover one side end of the piston so as to prevent this.

In addition, the bearing cover is characterized in that the engaging projection protruding a predetermined height in the circumferential direction on the back of the bearing cover to be secured by being fitted into the coupling groove formed in the circumferential direction on one end of the piston end.

In addition, the piston is provided with an insertion hole in which the inner diameter is extended to be coupled to the seal bearing so as to allow the seal bearing to be freely spaced in a direction perpendicular to the sliding direction of the driving rod to prevent the side friction between the driving rod and the seal bearing.

Inside the insertion hole is characterized in that the coil spring is provided to elastically support the other end of the seal bearing so that one end of the seal bearing is in close contact with the back of the bearing cover.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Briefly, the accompanying drawings, Figure 2 shows the overall structure of the sterling refrigerator according to the present invention, Figures 3 and 4 show the internal structure of the piston according to the present invention.

As shown in FIG. 2, the Stirling refrigerator according to the present invention compresses a case 10 filled with a working fluid such as helium or hydrogen, and an inner space of the case 10 with the working fluid filling space 13. In order to partition the space 12 and the expansion space 11, the linear motor 60, the piston cylinder 31 and the display cylinder 21 having the resonant springs 61 arranged in series at predetermined intervals are By providing, a product is made compact.

That is, the filling space 13 is formed in the space between the piston cylinder 31 and the linear motor 60, the compression space 12 is in the space between the displacer cylinder 21 and the piston cylinder 31. Is formed. In addition, the expansion space 11 is provided in the space between the displacer cylinder 21 and the side surface of the case 10.

In addition, the regeneration means 50 is provided between the compression space 12 and the expansion space 11 to serve as a refrigerator. To this end, the regeneration means 50 includes a high-temperature space portion 52 that radiates heat by a compression action of the working fluid and a low-temperature space portion 54 and a high-temperature space 52 that absorbs heat by the expansion action of the working fluid. A regenerator 51 disposed between the space sections 54 and accumulating heat is provided. The high temperature space portion 52 is connected to the compression space portion 12 through the first pipe 53, and the low temperature space portion 54 communicates with the expansion space portion 11 through the second pipe 55.

In addition, the displacer 20 is provided in the displacer cylinder 21 having both ends open, and the piston 20 is reciprocated in the piston cylinder 21, which is provided from the center of one side of the displacer 20. It is operated by the extended drive rod 22.

That is, one end of the driving rod 22 is coupled to one side of the displacer 20, and the other end of the driving rod 22 has a linear motor 60 through the hollow portion 30a (see FIG. 3) formed axially in the center of the piston 30. ) Is fixed to the resonant spring 61.

Accordingly, as the linear motor 60 is driven, the volume of the expansion space 11 and the compression space 12 is changed in a predetermined phase by interlocking the displacer 20 together with the driving rod 22. As the volume of the expansion space 11 and the compression space 12 changes, the adjacent piston 30 also has a constant phase angle and reciprocates within the piston cylinder 31.

3 and 4, the hollow portion 30a of the piston 30 through which the driving rod 22 slidably slides is mechanically disposed between the driving rod 22 and the piston 30 of aluminum during operation. Seal bearing (40) to reduce friction loss and to prevent the working fluid of the compression space 12 to the filling space 13 and the piston to prevent the separation of the seal bearing (40) (30) A bearing cover 33 is provided to be coupled to cover one side end.

The seal bearing 40 is formed in a cylindrical pipe shape made of plastic material so that both ends thereof are opened, and the seal bearing 40 is installed to be movable in a direction perpendicular to the sliding direction of the driving rod 22, thereby driving when the driving rod 22 is eccentric. Uneven friction between the outer periphery of the rod 22 and the seal bearing 40 is prevented to reduce the mechanical loss, the detailed structure thereof is as follows.

First, the driving rod 22 is fitted to be coaxially coupled to the hollow portion 30a at the center of the piston 30, and the inner diameter D1 is disposed at the hollow portion 30a of the piston 30 adjacent to the compression space portion 12. ) Is made relatively larger than the other parts, the insertion hole 32 is formed is inserted into the seal bearing 40 is coupled. Seal bearing 40 is open at both ends and extends to a predetermined length in the shape of a cylindrical pipe, the outer diameter (D2) thereof is slightly smaller than the inner diameter (D1) of the insertion hole (32) to be coupled to the insertion hole (32) with ease. do. Therefore, a predetermined gap G is formed between the outer circumference of the seal bearing 40 and the inner circumference of the insertion hole 32.

In order to prevent the seal bearing 40 from being separated, a disc-shaped bearing cover 33 having a through hole 30a drilled in the center thereof is attached to one end of the piston 30 so as to penetrate the driving rod 22. A coupling protrusion 33b protruding a predetermined height in the circumferential direction is formed on the rear surface of the bearing cover 33, and a coupling groove 30b is provided at one end of the corresponding piston 30 in the circumferential direction. At this time, the stepped groove (30c) formed in the circumferential direction is formed in the inlet portion of the coupling groove (30b) the outer diameter is extended in the same manner as the bearing cover (33), forcing the coupling projection (33b) in the coupling groove (30b) When fitted, the outer surface of the bearing cover 33 is firmly fixed while forming the same surface as one end of the piston 30 to prevent the separation of the seal bearing 40.

In addition, in the insertion hole 32, a coil spring 42 for closely contacting one end portion 40a of the seal bearing 40 to the bearing cover 33 is provided. In order to install the coil spring 42, the other end portion 40b of the seal bearing 40 is provided with a stepped portion 41 having a reduced diameter, and the coil spring 42 is interposed therebetween. Therefore, the seal bearing 40 is elastically supported toward the bearing cover 33 side, whereby one end portion 40a of the seal bearing 40 is always maintained in close contact with the bearing cover 33.

As such, the driving rod 22 extending from the center of the displacer 20 passes through the seal bearing 40 provided in the insertion hole 32 and is connected to the resonance spring 61 of the linear motor 60. 40 is provided to be freely spaced in the direction perpendicular to the sliding movement direction of the drive rod 22 in the insertion hole (32). As a result, the displacer 20 and the piston 30 operate smoothly, and mechanical frictional loss is reduced as a result of the eccentric action of the driving rod 22. ) Is prevented from leaking to the filling space 13 side.

Next, the operation of the Stirling refrigerator according to the present invention configured as described above and the effects thereof will be described.

First, when power is applied to the linear motor 60 and driven, the displacer 20 connected through the driving rod 22 reciprocates in the displacer cylinder 21 in the axial direction, and at the same time, the piston cylinder ( 31) The piston 30 reciprocates with a constant phase difference from the displacer 20 therein.

Accordingly, the expansion space portion 11 and the compression space portion 12 is changed in the reverse phase of the volume, the working fluid filled in accordance with their volume change is isothermal compression and isothermal expansion. Subsequently, the working fluid of the expansion space 11 is supplied to the low temperature space 54 and expanded to absorb heat, thereby cooling the heat medium filled in the heat radiation member (not shown) of the heat exchange means (not shown). The working fluid of the compressed space 12 is supplied to the high temperature space 52 and compressed to release heat filled in the absorbing member (not shown) of the heat exchange means (not shown).

The seal bearing 40 supports the driving rod 22 of the displacer 20 to perform a smooth sliding movement during the operation of the sterling refrigerator. That is, since the seal bearing 40 is installed to be movable in a direction perpendicular to the direction of movement of the drive rod 22, the displacer 20 and the piston 30 smoothly reciprocate.

In more detail, since the seal bearing 40 supporting the driving rod 22 is coupled to allow a little play in the insertion hole 32 of the piston 30, the outer circumference of the driving rod 22 is increased. Seal bearing 40 moves to the eccentric side even if eccentric friction occurs in the inner circumference. As a result, mechanical losses due to partial friction are reduced, and the reciprocating motion of the displacer 20 and the piston 30 is smoothly achieved.

As a result, the compression space 12, the expansion space 11, and the filling space 13 are sequentially formed in one case 10, and the circulation of the working fluid is smoothly driven by the linear motor 60. In this case, the mechanical frictional loss of the driving rod 22 is reduced by the seal bearing 40.

In addition, since the one end portion 40a of the seal bearing 40 maintains a state of being in close contact with the rear surface of the bearing cover 33 by the elastic force of the coil spring 42, the working fluid of the compression space 12 is filled with a space. It does not flow out to the part 13.

On the other hand, the technical idea is not limited to this, and as shown in FIG. 5, even if the seal bearings 400, 410 in a pair of symmetrical configuration of the present invention can of course achieve. That is, in another embodiment of the present invention, the insertion hole 320 is formed in the hollow part 300a of the piston 300 adjacent to the compression space part 120 and is perpendicular to the sliding direction of the driving rod 220. Install a pair of seal bearings 400 and 410 so as to be spaced apart. At this time, the seal bearings 400 and 410 are arranged to be spaced apart by a predetermined interval, and by installing the coil springs 420 therebetween, the ends of the seal bearings 400 disposed on the outside are in close contact with the bearing cover 330. do.

Therefore, even if the driving rod 220 acts eccentrically, a pair of seal bearings 400 and 410 flow together in the eccentric direction to reduce mechanical friction loss, as well as the working fluid of the piston 300 hollow portion ( Outflow to the filling space 13 side through 300a is prevented.

As described in detail above, according to the sterling refrigerator according to the present invention, the linear motor, the piston and the displacer are installed in a casing, and the inner space is divided into a filling space portion, a compression space portion, and an expansion space portion in which a working fluid is filled. By driving the displacer and the piston using a driving rod axially penetrating the center of the piston and reciprocating by the linear motor, there is an advantage that the product can be made compact. In addition, since the seal bearing is installed at the center of the piston to support the sliding movement of the driving rod and may be spaced in a direction perpendicular to the direction of movement, the movement of the driving rod is smoothly performed, thereby improving the efficiency of the Stirring Refrigerator. There is an action effect that can prevent the working fluid in the part from leaking to the filling space side.

Claims (2)

A case 10 having an internal space provided to compress and expand the working fluid, a piston cylinder 31 disposed in the middle of the case 10 and partitioning the internal space from side to side, and the piston cylinder 31. One side space of the case 10 partitioned by the expansion space portion 11 and the compression space portion 12 is divided into a displacer cylinder 21 and coaxially disposed with the piston cylinder 31, the piston The linear motor 60 disposed in the other space of the case 10 so as to form the filling space 13 between the cylinder 31 and the displacer cylinder 21 according to the driving of the linear motor 60. The displacer 20 is provided with a drive rod 22 connected to the linear motor 60 at a distal end thereof so that the drive rod 22 is moved forward and backward within the piston cylinder 31. Hollow in the center to penetrate axially In the Stirling refrigerator (30a) with piston (30) is formed, The piston 30 is A seal bearing 40 disposed on one side of the hollow part 30a and configured to have a cylindrical pipe shape to support a sliding motion of the driving rod 22 to prevent the outflow of the working fluid; An insertion diameter for preventing partial friction between the seal bearing 40 and the driving rod 22 is formed by expanding the inner diameter D1 on one side of the hollow portion 30a so that the seal bearing 40 can be disposed to be free. 32, In order to prevent detachment of the seal bearing 40 embedded in the insertion hole 32, a through hole 33a through which the driving rod 22 penetrates is formed to cover one end of the piston 30. Disc-shaped bearing cover 33, And a spring 42 disposed in the insertion hole 32 to elastically support the seal bearing 40 so that the end of the seal bearing 40 is in close contact with the bearing cover 33. Stirring freezer. The method of claim 1, A coupling groove 30b is formed in the circumferential direction at one end end surface of the piston 30, Stirling freezer, characterized in that the bearing cover 33 is provided with a coupling protrusion (33b) protruding a predetermined height in the circumferential direction to be forcibly coupled to the coupling groove (30b).