JP2000120535A - Linear compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration to be propagated to an enclosed housing without enlarging the outside dimensions of the enclosed housing in a linear compressor. SOLUTION: This linear compressor is equipped with a cylinder part 10 to be supported by a supporting mechanism part 90 in a chest 80, a piston body 28 to be slidably supported at the same axial center with the cylinder part 10 along the axial direction, and a linear motor part to generate a thrust after making up a magnetic circuit with a movable part 40 to be locked to the piston body 28 and a stationary part 50 to be locked to the cylinder part 10, and in this constitution, an axial center direction of the cylinder part 10 is turned to a horizontal direction. IN this case, the supporting mechanism part 90 is comprised of a coil spring 91 on one end side, supporting the cylinder 10 from both ends, and a coil spring 92 on the other end side, while at least either of these coil springs 91, 92 at both end sides is constituted after both these coil springs 91, 92 are juxtaposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear compressor in which a cylinder slidably supporting a piston is supported on a closed container by a coil spring.

[0002]

2. Description of the Related Art In a refrigeration cycle, it is said that an HCFC-based refrigerant represented by R22 destroys the ozone layer due to the stability of its physical properties. In recent years, HCFC
Although an HFC-based refrigerant is used as a substitute refrigerant for the system refrigerant, the HFC-based refrigerant has a property of promoting a warming phenomenon. Therefore, recently, HC-based refrigerants that do not significantly affect the destruction of the ozone layer and the warming phenomenon have begun to be adopted. However, since the HC-based refrigerant is flammable, it is necessary to prevent explosion and ignition from the viewpoint of ensuring safety. For this purpose, it is required to minimize the amount of the refrigerant used. On the other hand, the HC-based refrigerant has no lubricity as the refrigerant itself, and has a property of being easily dissolved in a lubricant. From the above, when an HC-based refrigerant is used, an oilless or oil-poor compressor is required, and a linear compressor in which a load hardly acts in a direction orthogonal to the axis of the piston is effective.

Here, in a conventional linear compressor, it has been proposed to support the compression mechanism by a coil spring in order to prevent the vibration of the compression mechanism from being applied to the outside.
For example, Japanese Patent Application Laid-Open No. 9-88817 proposes a configuration in which an upper portion of a cylinder and an upper end surface of a casing are supported by a plurality of coil springs, and a lower portion of the cylinder and a lower end surface of the casing are supported by a plurality of coil springs. I have. In Japanese Utility Model Laid-Open Publication No. 58-137885, a compressor mechanism having a horizontal vibration direction is shown.
A support structure has been proposed in which both sides of the compression mechanism are suspended by a coil spring. In addition, 3-1142
Japanese Patent Application Laid-Open No. 7-74131 discloses a configuration in which a discharge pipe that leads a refrigerant compressed in a compression chamber to an outside of a closed container is wound in a spring shape.

[0004]

However, Japanese Patent Laid-Open No. 9-8 / 1994
Since the support structure described in JP-A-8817 is configured to support the compression mechanism at the upper part and the lower part, the spring constant of the upper-side coil spring and the lower-side coil spring is set as described in the same publication. You have to consider it. Further, the support configuration described in Japanese Utility Model Laid-Open No. 58-137885 is not a support configuration inside a closed container. Therefore, if the support structure of the coil spring described in the publication is provided in the closed container as it is, there is a problem that the closed container becomes large. Further, in the device disclosed in Japanese Utility Model Publication No. 3-11427, the discharge pipe is wound in a spring shape, and therefore, it is considered that there is an effect of reducing damage to the discharge pipe due to vibration or the like. It is not always clear whether there is sufficient damping effect in relation to the department.

Accordingly, the present invention provides a cylinder supported from both ends by a support mechanism in a closed container, a piston slidably supported along the same axis along the axis of the cylinder, and a piston. A linear compressor having a movable section fixed to the cylinder and a linear motor section for generating a thrust by forming a magnetic path with a fixed section fixed to the cylinder, without increasing the outer dimensions of the closed vessel, It is intended to reduce the vibration transmitted to the vehicle. More specifically, it is an object of the present invention to provide a support mechanism capable of effectively controlling not only vibration generated in the axial direction of the piston but also vibration generated in the circumferential direction with respect to the axial center. And Another object of the present invention is to provide a linear compressor that can use the same coil spring without considering characteristics of the coil spring corresponding to each installation position when the configuration is such that the linear compressor is supported by a plurality of coil springs. And Another object of the present invention is to improve the vibration resistance of the discharge pipe by effectively utilizing the space in the sealed container generated by such a support structure using a coil spring.

[0006]

According to a first aspect of the present invention, there is provided a linear compressor according to the present invention, comprising: a cylinder supported by a support mechanism in a closed container; A piston that is slidably supported by the piston, and a linear motor section that generates a thrust by forming a magnetic path with a movable section fixed to the piston and a fixed section fixed to the cylinder, and the shaft of the cylinder is provided. A horizontal linear compressor having a horizontal center direction, wherein the support mechanism is configured by one end side coil spring and the other end side coil spring that support the cylinder from both ends in the closed container, and the one end side At least one of the coil spring and the other end side coil spring is configured by arranging a plurality of coil springs in parallel. According to a second aspect of the present invention, in the linear compressor according to the first aspect, the one end side coil spring and the other end side coil spring are configured by the same number of coil springs. According to a third aspect of the present invention, in the linear compressor according to the second aspect, the one end side coil spring and the other end side coil spring have two coil springs arranged side by side in a lateral direction. According to a fourth aspect of the present invention, in the linear compressor according to the first aspect, a discharge pipe that leads the compressed refrigerant to the outside is provided at an end of the closed container. The present invention according to claim 5 provides:
The linear compressor according to claim 1, wherein a suction pipe for introducing a compressed refrigerant into the inside is provided at an end of the closed container. The present invention described in claim 6 is the first invention.
Wherein the compression chamber is formed at one end of the cylinder, and a discharge pipe that guides the refrigerant compressed by the compression chamber from one end of the closed container that is closer to the compression chamber. In the linear compressor, when the support mechanism that supports one end of the closed container is a one-end coil spring, the number of coil springs constituting the other-end coil spring is larger than that of the one-end coil spring. It is characterized by. The linear compressor according to the present invention according to claim 7,
A cylinder supported from both ends by a support mechanism in a closed container, a piston slidably supported along the axial direction at the same axis as the cylinder, a movable part fixed to the piston, and A linear motor section for generating a thrust by forming a magnetic path at a fixed portion fixed to the cylinder, forming a compression chamber on one end side of the cylinder, and allowing the refrigerant compressed in the compression chamber to flow outside the sealed container. A linear compressor in which the discharge pipe is wound around the support mechanism on one end side in a spring shape and disposed, and the spring constant of the support mechanism on one end side is The spring constant of the discharge pipe is larger than the spring constant. Claim 8
According to the present invention, in the linear compressor according to the present invention, a part of the discharge pipe is disposed on an outer periphery of the cylinder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A linear compressor according to a first embodiment of the present invention is of a horizontal type in which the axial direction of a cylinder housed in a closed container is horizontal, and a support for supporting the cylinder is provided. One end side coil spring and the other end side coil spring that horizontally support both ends of the cylinder are used as the mechanism. In addition, at least one of the one end side coil spring or the other end side coil spring that supports the cylinder from both ends has a plurality of coil springs arranged in parallel. By arranging a plurality of coil springs in this way, it is possible to prevent movement occurring in the circumferential direction with respect to the axis of the cylinder, and to stably support the cylinder in a balanced manner.

A linear compressor according to a second embodiment of the present invention is the same as the first embodiment, except that the one end side coil spring and the other end side coil spring are constituted by the same number of coil springs. By using the same number of coil springs as described above, the own weight of the cylinder acts in common, so that the same number of coil springs can be used.

A linear compressor according to a third embodiment of the present invention is different from the second embodiment in that one end side coil spring and the other end side coil spring are each constituted by two coil springs. By configuring the one end side coil spring and the other end side coil spring with the two coil springs in this manner,
In addition to improving the earthquake resistance, a sufficient space can be formed around the support mechanism to secure a space around which the discharge pipe or the like is wound.

[0010] A linear compressor according to a fourth embodiment of the present invention is the same as the first embodiment, except that a discharge pipe is provided at an end of the closed vessel for discharging compressed refrigerant to the outside. As described above, by providing the discharge pipe at the end of the closed container, the discharge pipe can be provided by utilizing a space required for disposing the support mechanism. Therefore, in a low-pressure compressor, the discharge pipe can be lengthened, or a vibration-proof structure can be adopted so as to withstand vibration. A space can be formed.

A linear compressor according to a fifth embodiment of the present invention is the same as the first embodiment, except that a suction pipe for introducing a compressed refrigerant into the inside of the closed vessel is provided at the end of the closed vessel. As described above, by providing the suction pipe at the end of the closed container, the suction pipe can be provided by utilizing a space required for disposing the support mechanism. Therefore, in the high-pressure compressor, the suction pipe can be lengthened, or a vibration-proof structure can be adopted to withstand vibration.

A linear compressor according to a sixth embodiment of the present invention is different from the first embodiment in that a compression chamber is formed at one end of a cylinder, and the refrigerant compressed in the compression chamber is supplied to a closed container. It is provided with a discharge pipe extending from one end of the side close to the compression chamber, and when the support mechanism that supports one end of the closed container is a one end coil spring, the other end coil spring is more than the one end coil spring. The number of constituent coil springs is increased. By reducing the number of coil springs on the side where the discharge pipe is provided, a space for winding the discharge pipe can be sufficiently secured, and the earthquake resistance of the discharge pipe can be improved.

In a linear compressor according to a seventh embodiment of the present invention, the discharge pipe is wound in a spring shape along a support mechanism, and at this time, the spring constant of the support mechanism is changed to the spring constant of the discharge pipe. Larger than. By making the spring constant of the support mechanism larger than the spring constant of the discharge pipe, the vibration of the cylinder is reliably damped by the support mechanism,
The load on the discharge pipe can be reduced. Therefore, the vibration resistance of the discharge pipe can be improved, and damage to the discharge pipe can be reliably prevented.

The linear compressor according to an eighth embodiment of the present invention is the same as the linear compressor according to the seventh embodiment, except that a part of the discharge pipe wound in a spring shape is disposed on the outer periphery of the cylinder. The total length can be further reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the linear compressor according to the present invention will be described below with reference to the drawings. First, the overall structure of the linear compressor of the present invention will be described with reference to FIG. This linear compressor is roughly divided into a cylinder section 10, a piston section 20, a movable section 40 and a fixed section 50 constituting a linear motor section,
Discharge mechanism 60, spring mechanism 70, closed container 80
And a support mechanism 90 and the like.

The cylinder 10 includes a flange 11 and a flange 11
The boss portion 12 protruding leftward in the figure from the left, and the cylindrical body portion 13 and the like holding the piston portion 20 are integrally formed. The piston body 2 is provided inside the boss portion 12.
A space portion 14 forming a compression chamber in which the pressure chamber 8 is disposed is formed with one end side opened. In addition, the suction port 1 provided on the flange 11 side
5 communicates with the inside of the space 14. Further, a cylinder hole 16 formed inside the cylindrical portion 13 communicates with the space portion 14 and opens at the rear end side. A ring body 17 made of a thin metal material or the like is fitted on the inner surface of the cylinder hole 16. In this embodiment, the cylinder section 10 is made of an aluminum material, and the ring body 17 is provided for improving the slidability.

The piston portion 20 is composed of a rod 22 forming an inner hole 21 and a piston body 28, and in this embodiment is formed of an aluminum material. By using an aluminum material for the piston portion 20, the weight can be reduced, and the rigidity of a spring mechanism 70 described later can be reduced. Piston 2
Reference numeral 0 denotes a thin steel liner 23 fitted around the outer periphery of the rod 22 and the piston body 28. The thin steel liner 23 is slidably held by the ring body 17 on the cylinder section 10 side. A flange portion 24 is provided at the rear end of the piston portion 20.
A piston body 28 is provided at the front end. Flange part 2
4 is formed with a hole 24A at the center thereof for fitting the piston portion 20, and a side portion 24B concentric with the axis of the piston portion 20.
And the side portion 24B orthogonal to the axis of the piston portion 20
The end face 24C formed adjacent to the spring mechanism 70 and the spring mechanism 70
And a connecting shaft portion 25 that connects to the shaft. In addition, the flange 2
4 is a ring-shaped push plate 26 which comes into contact with the end face portion 24C.
Are connected by bolts 27.

The piston body 28 has an opening / closing valve 29 provided on the opening side of the front end of the piston portion 20 and a stopper portion 30 for supporting the opening / closing valve 29 so as to be movable in the axial direction and restricting the amount of movement. A stopper member 31 is provided. A tapered surface 3 is provided on the opening side of the front end.
2 are formed. Further, a plurality of through holes 3 through which the suction refrigerant passes.
3 are formed, and the through holes 33 communicate with the suction ports 15 respectively. The stopper member 31 is connected to the inner hole 21 of the piston portion 20.
The shaft portion is fitted into the inside and fixed to the tip of the rod 22. On the other hand, the opening / closing valve 29 is provided on the tapered surface 3 of the piston body 28.
2 and a flat surface 35 on the front end side.
And is slidably supported by the tip of the piston portion 20. With the above structure, the opening / closing valve 29 is movable along the axial direction of the piston portion 20, and when the piston portion 20 moves in the refrigerant compression direction, the tapered portion 34 of the opening / closing valve 29 becomes the tapered surface 32 of the piston body 28. And the through hole 33 is closed. In the present embodiment, as shown in FIG.
8 and the flange portion 24 are configured separately,
The rod 22 and the piston body 28 or the rod 22 and the flange 24 may be formed integrally.

Next, the linear motor section will be described. As described above, the linear motor section includes the movable section 40 and the fixed section 50.
Consists of First, the movable section 40 includes a cylindrical holding member 41.
, A permanent magnet 42, a cylindrical body 43 and the like. The fixing portion 50 includes an inner yoke 51 and an outer yoke 5.
2, a coil 53 and the like. The cylindrical holding member 41, the permanent magnet 42, and the cylindrical body 43 of the movable section 40 are all cylindrical, and are arranged concentrically with the piston section 20. The cylindrical holding member 41 is made of a thin member, and has a flange surface 44 at the rear end. The cylindrical holding member 41 includes the side surface portion 24B and the end surface portion 24 of the flange portion 24.
It is arranged so as to circumscribe C. The permanent magnet 42 is provided so as to circumscribe the cylindrical holding member 41. The cylindrical body 43 is provided so as to circumscribe the permanent magnet 42. In this embodiment, the permanent magnet 42 is sandwiched between the cylindrical holding member 41 and the cylindrical body 43.

The fixed part 50 includes an inner yoke 51, an outer yoke 52, and a coil 53. Inner yoke 5
Reference numeral 1 denotes a cylindrical body, which is circumscribed to the cylindrical body 13 of the cylinder 10 and fixed to the flange 11. A minute gap is formed between the outer periphery of the inner yoke 51 and the cylindrical holding member 41. Thus, the inner yoke 51 is arranged concentrically with the cylinder part 10 and the piston part 20. On the other hand, the outer yoke 52 is also formed of a cylindrical body, and is disposed so as to form a minute gap around the outer periphery of the cylindrical body 43.
0 is fixed to the flange 11. Thus, the movable part 40 and the fixed part 50 are held concentrically.

Next, the ejection mechanism 60 will be described. FIG. 2 is a partial cross-sectional view illustrating the ejection mechanism unit 60. The discharge valve support 61 is fixed to the front end of the cylinder part 10, and a discharge hole 62 is formed in the center thereof. In addition, the ejection holes 62
Is provided with a discharge valve 63. The muffler 64 is fixed to the discharge valve support 61. On the other hand, the spiral discharge pipe 65
Has a base end connected to the discharge port 66 of the muffler 64 and a front end connected to the discharge pipe 67. Spiral discharge pipe 6
As shown in FIG. 5, the pipe 5 is formed by spirally bending a pipe material, and a part thereof is wound around the outer peripheral space of the cylinder portion 10 and the muffler 64. Here, the spiral discharge pipe 65 is configured to have a spring constant smaller than the spring constant of the support mechanism 90. In addition, the spiral discharge pipe 65 and the discharge pipe 67 may be formed integrally or may be formed by connecting different members.

Next, the spring mechanism 70 and the sealed container 80 will be described. The spring mechanism 70 includes flat spring plates 71 and 72 disposed on the other end side. As shown in the figure, the spring plates 71 and 72 are disposed on the rear end sides of the cylinder portion 10 and the piston portion 20, respectively, in such a manner as to extend over them. The closed container 80 is composed of a cylindrical container having a rear end plate 81, a front end plate 82, and a cylindrical body 83 fixed between them, and forms a space portion 84 therein. And the space 84
The components of the linear compressor are housed therein. The rear end plate 81 is provided with a suction pipe 85 and the front end plate 82 is provided with a discharge pipe 67.

Next, the support mechanism 90 will be described.
3 is a sectional view taken along the line III-III of FIG. 1, and FIG. 4 is a sectional view taken along the line IV-IV of FIG. The support mechanism 90 is provided with the other end side coil spring 9.
1 and one end side coil spring 92. The other end side coil spring 91 includes a bridge plate 93 and a rear end plate 81 of the sealed container 80.
And the one end side coil spring 92 is connected to the muffler 64.
And the front end plate 82 of the closed casing 80. As described above, the other end side coil spring 91 and the one end side coil spring 92 support the cylinder 10 from both sides.
The other end side coil spring 91 includes two coil springs 91.
A, 91B are arranged side by side in the lateral direction, and one end side coil spring 92 is provided.
Has two coil springs 92A and 92B arranged side by side in the lateral direction. Therefore, since the same load is applied to the other end side coil springs 91A and 91B and the one end side coil springs 92A and 92B, the same spring constants can be used. In this embodiment, the one end side coil spring 92
Although the two coil springs 91 and the other end side coil springs 91 are described in parallel, the one end side coil springs 92
Alternatively, by configuring at least one of the other end side coil springs 91 with two coil springs, the movement in the circumferential direction with respect to the axis of the cylinder portion 10 can be effectively damped. At this time, in the configuration as in the above embodiment, it is more preferable that the other end side coil spring 92 be formed of two coil springs. This is because, by reducing the number of coil springs constituting the one end side coil spring 91, a space for winding the spiral discharge pipe 65 can be sufficiently ensured. In the above embodiment, the two coil springs 92A and 92B forming the one end side coil spring 92 and the two coil springs 91A and 91B forming the other end side coil spring 91 are arranged side by side in the lateral direction. , May be arranged in the vertical direction, or may be arranged at other angles. In addition, by using three coil springs or more coil springs, the spring constant of one coil spring can be reduced, and the earthquake resistance can be further improved. However, in order to secure a sufficient space for winding the spiral discharge pipe 65, it is preferable that the number of coil springs is small, and it is preferable that the number of coil springs is three or less.

Next, the operation of the linear compressor of this embodiment will be described. First, when the coil 53 of the fixed portion 50 is energized,
A thrust proportional to the current is generated between the movable part 40 and the permanent magnet 42 according to Fleming's left-hand rule. Due to the generation of this thrust, a driving force is generated in the movable portion 40 that retreats in the axial direction. Cylindrical holding members 41, 41A of movable section 40
Is fixed to the flange portion 24, and the flange portion 24 is connected to the piston portion 20, so that the piston portion 20 retreats. Since the piston portion 20 is slidably supported by the cylinder portion 10, it retreats along its axial direction.

On the other hand, since the opening / closing valve 29 is freely supported by the piston main body 28 as the piston portion 20 retreats, a gap is formed between the opening and closing valve 29 by the retraction of the piston portion 20. Here, the energization of the coil 53 is given by a sine wave, and forward and reverse thrusts are alternately generated in the linear motor unit.
The piston portion 20 reciprocates due to the alternately generated forward and reverse thrusts.

The refrigerant is introduced from the suction pipe 85 into the closed container 80. The refrigerant introduced into the closed container 80 is
Mainly through the outer periphery of the outer yoke 52, the cylinder portion 10
Is introduced into the space part 14 of the cylinder part 10 from the suction port 15 of the cylinder part 10. This refrigerant is retreated by the retraction of the piston portion 20 and the tapered portion 34 of the on-off valve 29 and the piston body 2.
8 through the gap formed between the suction compression chamber 6 and the tapered surface 32.
Go inside 8. Then, the refrigerant in the suction compression chamber 68 is compressed by the advance of the piston portion 20. The compressed refrigerant is
The discharge valve 63 is opened, enters the muffler 64 through the discharge hole 62 of the discharge valve support 61, is diffused and muffled, enters the spiral discharge pipe 65 from the discharge port 66, and moves out of the discharge pipe 67. It is discharged toward. The vibration of the cylinder 10 caused by the reciprocation of the piston 20 as described above is
The vibration is damped by the other end side coil spring 91 and the one end side coil spring 92.

[0027]

As described above, according to the present invention, it is possible to reduce the vibration transmitted to the closed container without increasing the outer dimensions of the closed container. More specifically, the present invention can effectively control not only the vibration generated in the axial direction of the piston but also the vibration generated in the circumferential direction with respect to the axial center. Stable supported. In addition, since a common spring can be used, it is possible to simplify component management and reduce costs. Furthermore, the discharge pipe is wound in a spring shape, and the spring constant of the supporting mechanism is made larger than the spring constant of the discharge pipe, so that the vibration resistance is improved and the overall length of the compressor is shortened and downsized. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the overall configuration of a linear compressor according to one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a discharge mechanism according to the embodiment.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cylinder part 20 Piston part 28 Piston main body 40 Movable part 50 Fixed part 60 Discharge mechanism part 65 Spiral discharge pipe 66 Discharge port 67 Discharge pipe 80 Sealed container 90 Support mechanism part 91 Other end side coil spring 92 One end side coil spring

Claims (8)

[Claims] 1. A cylinder supported by a support mechanism in an airtight container, a piston slidably supported along the axis of the cylinder along the same axis, and a movable member fixed to the piston. And a linear motor section that generates a thrust by forming a magnetic path with a portion and a fixed portion fixed to the cylinder, wherein the horizontal linear compressor has a horizontal axis direction of the cylinder, The mechanism unit includes one end coil spring and the other end coil spring that support the cylinder from both ends in the closed container. At least one of the one end coil spring or the other end coil spring has a plurality of coil springs arranged in parallel. A linear compressor comprising: 2. The linear compressor according to claim 1, wherein the one end side coil spring and the other end side coil spring are constituted by the same number of coil springs. 3. The linear compressor according to claim 2, wherein the one end side coil spring and the other end side coil spring have two coil springs arranged in a horizontal direction. 4. The linear compressor according to claim 1, wherein a discharge pipe that leads the compressed refrigerant to the outside is provided at an end of the closed container. 5. The linear compressor according to claim 1, wherein a suction pipe for introducing a compressed refrigerant into the inside is provided at an end of the closed container. 6. A linear compressor having a compression chamber formed at one end of the cylinder, and a discharge pipe for leading a refrigerant compressed in the compression chamber from one end of the closed container close to the compression chamber. Where, when the support mechanism portion supporting one end side of the closed container is one end side coil spring, the number of coil springs constituting the other end side coil spring is larger than the one end side coil spring, The linear compressor according to claim 1. 7. A cylinder supported from both ends by a support mechanism in an airtight container, a piston slidably supported along the same axial center as the cylinder along its axial direction, and fixed to the piston. A linear motor portion that forms a magnetic path with a movable portion and a fixed portion fixed to the cylinder to generate a thrust, forms a compression chamber at one end of the cylinder, and a refrigerant compressed in the compression chamber. A linear discharge compressor having a discharge pipe leading out of the closed container, wherein the discharge pipe is wound around an outer periphery of the support mechanism on one end side in a spring-like manner, and the support mechanism on one end side is provided. The spring constant of a part is larger than the spring constant of the said discharge pipe, The linear compressor characterized by the above-mentioned. 8. The linear compressor according to claim 7, wherein a part of the discharge pipe is disposed on an outer periphery of the cylinder.