JP4273737B2 - Linear motor and linear compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a linear compressor using a linear motor used in a refrigeration cycle or the like.
[0002]
[Prior art]
In recent years, the need for higher efficiency in refrigeration equipment has further increased, and compressors using linear motors are widely used for higher efficiency because they can be expected to significantly reduce sliding loss due to the simple mechanical structure. (For example, refer to Patent Document 1).
[0003]
The conventional linear compressor will be described below with reference to the drawings.
[0004]
FIG. 12 is a cross-sectional view of a conventional linear compressor.
[0005]
In FIG. 12, the hermetic casing 1 accommodates a main body 3 having a linear motor portion 2 and stores lubricating oil 4.
[0006]
The linear motor unit 2 is held by the frame 5 and is held by the first silicon steel plate layer 6 formed in a hollow cylindrical shape, and is also held by the frame 5, and the outer periphery of the first silicon steel plate layer 6 is rotated. A stator 9 composed of a hollow cylindrical second silicon steel plate layer 8 formed with a predetermined gap on the side, and loosely inserted between the first silicon steel plate layer 6 and the second silicon steel plate layer 8; A plurality of magnets 11 are bonded to the tip of a magnet shell 10 made of a non-magnetic material, and the movable element 12 is formed in a hollow cylindrical shape.
[0007]
The magnet 11 is generally made of a magnet material made of a rare earth having a strong magnetic field such as neodymium, and is magnetized in a direction perpendicular to the reciprocating direction.
[0008]
The piston 15 inserted so as to freely reciprocate in a cylinder 14 having a cylindrical bore forms a bearing portion 16 with the cylinder 14, and the magnet shell 10 is integrally formed coaxially. The cylinder 14 is arranged inside the first silicon steel plate layer 6 formed in a hollow cylindrical shape, and the frame 5 is integrally formed on the outer periphery.
[0009]
The piston 15 has a hollow cylindrical shape, and a suction passage 17 is formed in the internal space. A suction valve 19 is attached to the opening end of the suction passage 17 on the compression chamber 18 side. A discharge valve 20 is disposed at the open end of the compression chamber 18.
[0010]
The cylinder 14, the piston 15, the first silicon steel plate layer 6, and the second silicon steel plate layer 8 share an axis, and the piston 15 holds the mover 12 by a bearing portion 16 formed between the piston 15 and the cylinder 15. Thus, the magnet 11 maintains a predetermined gap between the first silicon steel plate layer 6 and the second silicon steel plate layer 8.
[0011]
Both the inner resonance spring 21 and the outer resonance spring 22 are compression coil springs. The inner resonance spring 21 is disposed so as to contact the first silicon steel sheet layer 6 and the magnet shell 10, and the outer resonance spring 22 is disposed so as to contact the magnet shell 10 and the outer frame 23, and assembled together in a compressed state. It has been. The oil supply pump 24 is formed at the bottom of the main body 3 and is located in the lubricating oil 4.
[0012]
About the linear compressor comprised as mentioned above, the operation | movement is demonstrated below.
[0013]
First, when the coil 7 is excited through current, a series of magnetic fluxes are transferred from the first silicon steel plate layer 6 to the air gap, the magnet 11, the air gap, the second silicon steel plate layer 8, the air gap, the magnet 11, the air gap, and the first silicon steel plate layer 6. A loop occurs and forms a magnetic circuit. The magnet 11 is attracted to the magnetic pole formed on the second silicon steel plate layer 8 by this magnetic flux. Next, by alternating current to the coil 7, the mover 12 reciprocates in the horizontal direction in FIG. 12 between the first silicon steel plate layer 6 and the second silicon steel plate layer 8, and is coupled to the mover 12. The moved piston 15 also reciprocates in the cylinder 14.
[0014]
As a result, the refrigerant gas in the space in the sealed casing 1 is sucked into the compression chamber 18 from the suction valve 19 through the suction passage 17, compressed in the compression chamber 18, and discharged from the discharge valve 20. It will begin to work.
[0015]
At this time, the inner resonance spring 21 interposed between the cylinder 14 and the first silicon steel sheet layer 6 and elastically supporting the inner side of the movable element 12 and the outer resonance spring 22 elastically supporting the outer side of the movable element 12 are The linear reciprocating motion of the piston 15 is converted into elastic energy and stored, and the stored elastic energy is converted into linear motion to induce resonance motion.
[0016]
Further, the oil supply pump 24 supplies lubricating oil to the bearing portion 16 by vibration of the compressor body 3.
[0017]
[Patent Document 1]
JP 2001-73942 A
[0018]
[Problems to be solved by the invention]
However, since the mover 12 swings between the first silicon steel plate layer 6 and the second silicon steel plate layer 8 in the conventional configuration, the mover 12 includes the first silicon steel plate layer 6 and the second silicon steel plate layer 8. And have voids.
[0019]
The gaps for the two layers are provided with a distance necessary to prevent the mover 12 from coming into contact with both the first silicon steel plate layer 6 and the second silicon steel plate layer 8, but the space is magnetic. Since the magnetic flux is reduced in proportion to the distance, the current supplied to the coil 7 by an amount corresponding to the decrease in the magnetic flux due to the gap of the two layers is obtained in order to obtain the thrust necessary to drive the mover 12. As a result, the number of inputs increases, which makes it difficult to increase efficiency.
[0020]
At the same time, in order to obtain the thrust required to drive the mover 12, the conventional linear motor has to have a large magnet 11. However, since the magnet 11 uses an expensive rare earth as a material, the magnet 11 becomes large, resulting in a significant increase in cost.
[0021]
Furthermore, it is desirable that the two layers of gaps formed between the mover 12 and the first silicon steel plate layer 6 and the second silicon steel plate layer 8 have the same distance at any location. This is because if there is a difference in the gap distance, an unbalance of the magnetic attractive force occurs between the magnet 11 and the first silicon steel plate layer 6 or the second silicon steel plate layer 8, and as a result, in the swing direction of the mover 12. This is because a right-angle twisting force is generated, causing not only a sliding loss in the bearing portion 16 constituted by the piston 15 and the cylinder 14, but also causing abnormal wear and reducing the life. .
[0022]
Further, when the twisting force between the piston 15 and the cylinder 14 is large enough to cause wear, noise accompanying the sliding has occurred.
[0023]
In order to avoid this, there is a method of increasing the distance between the gaps of the two layers and reducing the ratio of the distance difference. However, the input increases and the magnet 11 needs to be further increased. Therefore, normally, the processing accuracy of the drive system including the magnet shell 10 is increased, but in order to increase the processing accuracy, it is necessary to increase the thickness of the magnet shell 10 which is a movable part, and as a result, the driving The weight of the system increases. And the thrust required to drive the mover 12 increases, the current supplied to the coil 7 increases, the input increases, the load supported by the bearing also increases, and the sliding loss increases. .
[0024]
Moreover, the magnet shell 10 and the piston 15 are connected outside the first silicon steel plate layer 6 and the second silicon steel plate layer 8, and an inner resonance spring 21 is provided between the magnet shell 10 and the first silicon steel plate layer 6. Since it is arranged, the magnet shell 10 has a long shape in the axial direction. In this way, with the cylindrical shape that is long in the axial direction, the rigidity of the tip portion to which the magnet 11 is attached tends to be low, and in order to ensure accuracy, it is necessary to increase the rigidity by a method that increases the weight, such as thickening the plate. is there.
[0025]
In addition to machining accuracy, it is indispensable to assemble with high precision so that the air gap is uniform, in order to reduce the unbalance of magnetic attraction force, but since there are two air gaps, both inside and outside of the magnet shell It is necessary to manage the air gaps in the manufacturing process, and the control of the accuracy during manufacturing becomes strict, resulting in a cost increase.
[0026]
Further, the hollow cylindrical magnet shell 10 is usually formed of a thin plate for weight reduction. However, if the rigidity of the magnet shell 10 or the structure supporting the magnet shell 10 is insufficient, the component accuracy and assembly accuracy, and the magnetic force variation of the magnet 11 are varied. The magnetic attraction force is unbalanced due to the above, and the support structure is deformed to attract the magnet 11 in the radial direction. Then, the magnet 11, the first silicon steel plate layer 6 and the second silicon steel plate layer 8 approach each other in each of the two air gaps, and the magnetic attractive force is further increased, so that the eccentricity of the magnet 11 is further increased. . As a result, a large force acts on the magnet shell 10 and the like, and noise is generated due to deformation. In the worst case, the first silicon steel plate layer 6 and the second silicon steel plate layer 8 collide with the magnet 11 and are damaged. There was a drawback of causing.
[0027]
The present invention maintains a uniform air gap, prevents noise and breakage due to imbalance in magnetic attraction force, and reduces loss generated in the sliding portion for supporting the mover, and is a highly efficient linear motor And it aims at providing a linear compressor.
[0028]
[Means for Solving the Problems]
  According to a first aspect of the present invention, there is provided a stator composed of a fixed iron core and a magnet wire engaged with the fixed iron core, a mover including a movable iron core and a magnet, and both sides of the movable element in a swinging direction. Disposed, a part is attached to the mover, the other part is attached to the stator, the mover is opposed to the stator while maintaining a constant gap with the magnetic pole of the stator, A leaf spring that is pivotably supported in the axial direction;The movable element has a substantially cylindrical shape, and the leaf spring has a plurality of arm parts extending from a fastening and fixing position to the movable element to a fastening and fixing position to the stator, and all the arm parts are Extending while turning in the same direction as seen from the axial directionBy supporting the mover with a leaf spring with respect to the stator, there is no need for a sliding portion for supporting the mover, and the effect of reducing the loss associated with the reciprocation of the mover of the motor is achieved. HaveIn addition, since the arm portion that is relatively long compared to the diameter is formed, the swing range within the elastic range can be increased, and the pivoting directions of the arms of the two leaf springs are the same. The direction of rotation caused by the minute torsion of the accompanying spring is the same, it does not increase the stress of the spring that occurs when the torsion is constrained, and the mover is substantially cylindrical, so the mover accompanying the deformation of the leaf spring Since the gap with the stator is kept constant even when there is rotation, the mover can be rotated.

[0030]
  further,The leaf springs arranged on both sides of the mover are attached while being shifted in the rotational direction so that the positions of the arm portions do not coincide with each other when viewed from the axial direction. A gap gauge can be inserted between the armature and the arm between the arm and the stator, so that the assembly can be performed while ensuring the space.
[0031]
  Claim 2The invention described inClaim 1The linear motor described in the above, a cylinder that shares an axis with the linear motor and forms a fixed portion together with the stator, and a piston that is reciprocally inserted into the cylinder and forms a movable portion together with the mover. A linear compressor driven at a frequency in the vicinity of the resonance frequency determined by the mass of the fixed part and the movable part and the spring constant of the leaf spring, and utilizing the resonance action of the spring and the mass With low energy loss, the piston reciprocates efficiently, and the mover is supported by a leaf spring to prevent the moving part's own weight from acting as a load in the sliding part of the cylinder and piston. Has the effect of reducing the force.
[0032]
  Claim 3The invention described inClaim 2In the described invention, the piston and the mover are connected via a ball joint. Even when the swinging direction of the motor and the direction of the cylinder axis are slightly shifted, the ball joint portion rotates. It has the effect of absorbing angular misalignment and preventing twisting.
[0033]
  Claim 4The invention described inClaim 2In the described invention, since the piston and the mover are connected via a retractable rod made of an elastic body, the retractable rod is elastically deformed even when the swinging direction of the motor and the axis of the cylinder are slightly displaced. As a result, the piston is allowed to be displaced in the direction parallel to the axis and in the rotational direction, and thus has an effect of preventing twisting.
[0034]
  Claim 5The invention described isClaims 2 to 4In the invention according to any one of the above, the swinging direction of the mover is substantially horizontal, and the diameter is small and long while holding the shaft against the weight of the mover by a leaf spring. By disposing a long compressor in the horizontal direction, the overall height of the compressor can be reduced as compared with the case where the swinging direction is made vertical or another type of linear motor is adopted. .
[0035]
  Claim 6The invention described inClaim 5Since the lubricating oil is not used, the lubricating oil adheres to the heat transfer surface of the heat exchanger of the cooling system, thereby preventing the heat transfer of the refrigerant gas from being inhibited.
[0036]
Claim 7The invention described inClaim 6In the invention described in (1), the sliding portion between the piston and the cylinder is constituted by a gas bearing, so that the sliding loss between the piston and the cylinder due to the viscous resistance of the lubricating oil is eliminated, and the efficiency is improved.
[0037]
  Claim 8The invention described inClaim 6In the invention described in claim 1, since a material having self-lubricating property is used for at least one of the piston or the cylinder, there is no viscous resistance of lubricating oil in the sliding portion between the piston and the cylinder, and the sliding between the piston and the cylinder This has the effect of preventing the wear of the part.
[0038]
  Claim 9The invention described inClaim 6In the invention described in claim 1, since ceramic material is used for at least one of the piston and the cylinder, there is no viscous resistance of lubricating oil in the sliding portion between the piston and the cylinder, and wear of the sliding portion between the piston and the cylinder. It has the effect | action of preventing.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a linear motor and a linear compressor according to the present invention will be described with reference to the drawings. In addition, about the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
[0040]
(Embodiment 1)
1 is a side sectional view of a linear motor according to Embodiment 1 of the present invention, FIG. 2 is a schematic view showing a relative position of a leaf spring, FIG. 3 is a perspective view showing an assembled state of the linear motor, and FIG. FIG. 5 is a schematic diagram showing the direction of current flow in the linear motor.
[0041]
1 to 5, a substantially cylindrical stator 25 accommodates two magnet wires 26a and 26b wound in a ring shape and the magnet wires 26a and 26b, and three magnetic poles 29a and 26b on the inner periphery. The fixed iron core 27 which forms 29b and 29c, and the frame 28 which supports the outer periphery of the fixed iron core 27 are comprised.
[0042]
The fixed iron core 27 is magnetically non-directional and has high magnetic permeability, for example, silicon steel plates represented by a non-directional electromagnetic steel strip of JIS C2852 are arranged radially with respect to the cylindrical axis. . The fixed iron core 27 has magnetic poles 29a, 29b, and 29c formed on the inner peripheral surface, and is assembled so as to sandwich magnet wires 26a and 26b wound beforehand in a ring shape.
[0043]
The ends 26c, 26d, 26e, and 26f of the windings of the magnet wires 26a and 26b are provided with a gap in a part of the thin plate arranged radially of the fixed iron core 27 so that a current flows around the axis as shown in FIG. They are wired so that the flow directions are opposite to each other. Further, the end portions 26g and 26h are drawn to the outside of the fixed iron core 27 by using electrically insulated conductive wires.
[0044]
The mover 31 has a substantially cylindrical shape sharing an axis with the stator 25, is housed inside the stator 25 so as to be swingable in the axial direction, and includes a shaft 32 made of an iron-based material, and the shaft 32. A movable iron core 34 formed integrally with a thin plate portion 33 in which silicon steel plates, such as a non-oriented electromagnetic steel strip of JIS C2852, are arranged radially on the outer periphery of the steel plate and having a high magnetic permeability. It is formed of magnets 35a and 35b that are fixed to the outer periphery of the movable iron core 34 by an adhesive with an inner periphery of the stator 25 and a fixed gap, separated into two in the axial direction, and having different magnetic poles on the surface. As the magnet 35, a magnet containing a rare earth element and having a strong magnetic field is used.
[0045]
The leaf springs 42a and 42b are arranged on both sides of the mover 31 in the axial direction. The leaf springs 42a and 42b have elasticity and are made of a flexible plate-like metal material. Specifically, the leaf springs 42a and 42b are made of an iron-based material such as spring steel, tool steel, or stainless steel. The leaf springs 42a and 42b are provided with through holes at three locations, a center portion 42c and tip ends 42d and 42e of two spiral arms, and the center portion 42c is formed on the shaft 32 of the mover 31 and both ends 42d on the outer diameter side. , 42e are respectively connected to the frame 28 of the stator 25 by bolts.
[0046]
All the leaf springs are attached such that arm portions 42f and 42g extending from the center portion 42c to both ends 42d and 42e turn counterclockwise as viewed from the cylinder head side. Further, the attachment angle of the leaf spring 42a to the frame body 28 is rotated approximately 90 degrees with respect to the attachment angle of the leaf spring 42b to the frame body 28 so that the positions of the arm portions 42f and 42g do not coincide on both sides of the motor. It has become the direction.
[0047]
By the leaf springs 42a and 42b, the mover 31 faces the magnetic poles 29a and 29b of the stator 25 while maintaining a certain gap, and is supported to be swingable in the axial direction, so that the mover 31 and the stator 25 are supported. The linear motor 43 which consists of etc. is comprised.
[0048]
The operation of the linear motor configured as described above will be described below.
[0049]
When a current is passed through the ring-shaped magnet wires 26a and 26b, first, a magnetic flux Φ that loops to the fixed iron core, the gap, the magnet, the movable iron core, the magnet, the gap, and the fixed iron core is generated as indicated by the arrows. Due to this magnetic flux Φ, the magnetic poles 29a, 29b, 29c to the fixed iron core are magnetized to the N, S, and N poles, respectively. Since the outer surfaces of the magnets 35a and 35b of the mover 31 are magnetized to the S and N poles, the attractive and repulsive forces indicated by the white arrows are generated between the respective magnetic poles and the respective magnets. The child 31 is driven in the direction indicated by the arrow a.
[0050]
Next, when a reverse current flows through the magnet wires 26a and 26b, an operation opposite to that described above occurs, and the mover 31 is driven in the direction opposite to the arrow A. The reciprocating operation of the mover 31 is performed by controlling to alternately switch the direction and the magnitude of the current.
[0051]
Here, since the magnets 35a and 35b are fixed to the outer periphery of the movable iron core 34, compared to the conventional movable magnet type linear motor, there is no gap between the magnets 35a and 35b and the movable iron core 34, so that the magnet 35a and 35b is in the magnetic flux loop. There are few voids. As a result, since the magnetic resistance is reduced, the magnetic flux flows more easily than the movable magnet type, and the current to the magnet wires 26a and 26b that generate a constant magnetic flux to obtain the required thrust can be reduced, improving the efficiency. The amount of magnets can be reduced.
[0052]
In the mover 31, since the magnets 35a and 35b are bonded to the movable iron core 34, the structure is strong and the accuracy of the outer diameter can be easily improved. Further, although the mover 31 is supported by the leaf springs 42a and 42b with respect to the stator 25, the leaf springs 42a and 42b have higher radial rigidity than the axial spring constant. Even if a load due to the weight of the mover 31 or an imbalance of the magnetic attraction force acts between the stators 25, the change in the gap between the mover 31 and the stator 25 is extremely small. Accordingly, it is possible to prevent the mover 31 from being deformed to generate noise, and the mover 31 and the stator 25 to collide with each other.
[0053]
Since the leaf springs 42a and 42b have a plurality of arm portions 42f and 42g that extend while turning in the same direction, a relatively long arm portion is formed in comparison with the diameter. As a result, the increase in spring stress can be mitigated.
[0054]
Further, since the turning directions of the arm portions 42f and 42g of the leaf springs 42a and 42b are the same, the direction of rotation caused by the minute twist of the spring accompanying the reciprocation of the two springs is also the same, and the cylindrical movable element 31 By rotating slightly, it is possible to prevent an increase in stress generated when restraining torsion and improve reliability.
[0055]
Further, when the movable element 31 is fixed to the stator 25, it is necessary to secure a uniform gap by inserting a plurality of thin gap gauges having a small width between the movable element 31 and the stator 25. However, by disposing the leaf springs 42a and 42b on both end faces of the motor, the gap between the mover 31 and the stator 25 is hidden by the shadow of the leaf springs 42a and 42b, and the gap is exposed. The number of parts is reduced as shown in FIG. However, it is possible to insert the gap gauges on almost the entire circumference by disposing the attachment angles of the leaf springs 42a and 42b by 90 degrees on both sides of the mover 31 and inserting the gap gauges from both sides of the motor. . Therefore, a uniform gap can be secured by connecting the mover 31 and the stator 25 with a leaf spring after inserting the gap gauge. As a result, it is possible to prevent the generation of a twisting force due to the imbalance of the magnetic adsorption force, thereby reducing the occurrence of sliding loss and preventing wear.
[0056]
(Embodiment 2)
6 is a side sectional view of a linear compressor according to Embodiment 2 of the present invention, and FIG. 7 is a horizontal sectional view of FIG.
[0057]
6 and 7, the compressor main body 53 including the linear motor 43 is accommodated in the hermetic casing 1.
[0058]
A piston 52 connected to the mover 31 of the linear motor 43 is inserted into a cylinder 51 connected to the stator 25 of the linear motor so as to reciprocate. A cylinder head 54 and a suction muffler 55 are attached to the end surface of the cylinder 51, and a fixing portion 57 is formed together with the cylinder 51 and the stator 25.
[0059]
Further, the movable portion 58 is constituted by the piston 52, the movable element 31, and the like. The piston 52 is attached to the tip of the shaft 32 of the movable element 31, and the shaft 32 and the piston 52 are rotatable via the ball joint 61. Linked in state.
[0060]
Each of the leaf springs 42a and 42b is attached to the movable portion 58 at the center and to the fixed portion 57 at both ends to constitute a resonance spring 59.
[0061]
The cylinder 51 is attached to the frame body 28 of the stator 25 of the linear motor 43, and a piston 52 is inserted in a swingable state on a cylindrical inner surface 51a.
[0062]
The compressor body 53 is elastically supported by a suspension spring 64 in the hermetic casing 1 so that the reciprocating direction of the linear motor 43 is substantially horizontal.
[0063]
Furthermore, one end of the capillary tube 66 is immersed in the lubricating oil 4 stored at the bottom of the hermetic casing 1, and the other end is opened in the tube portion 55 a of the suction muffler 55.
[0064]
About the linear compressor comprised as mentioned above, the operation | movement is demonstrated below.
[0065]
When an electric current is passed through the linear motor 43, the reciprocating motion of the mover 31 causes the piston 52 attached thereto to reciprocate within the cylinder 51, thereby operating as a compressor. At this time, by setting the frequency of the current in the vicinity of the resonance frequency determined by the mass of the fixed portion 57 and the movable portion 58 and the spring constant of the resonance spring 59, the linear motor 43 can efficiently reciprocate due to the resonance action. It becomes.
[0066]
The refrigerant gas is sucked into the compression chamber 18 from the suction muffler 55. At this time, lubricating oil is supplied from the capillary tube 66 and lubricates the sliding portions of the piston 52 and the cylinder 51.
[0067]
Since the load acting between the mover 31 and the stator 25 is supported by the leaf springs 42a and 42b, the lateral force hardly acts on the sliding portion of the piston 52 and the cylinder 51. Furthermore, since the piston 52 and the mover 31 are connected via the ball joint 61, the swinging direction of the linear motor 43 and the axis of the cylinder 51 are slightly shifted due to the influence of component dimensions and assembly accuracy. Even in this case, since the ball joint 61 rotates, the piston 52 and the cylinder 51 can be prevented from being twisted. Therefore, it is possible to prevent a decrease in efficiency due to an increase in sliding loss and a decrease in reliability due to friction.
[0068]
Moreover, in the linear compressor of the present invention, the cylinder 51, the leaf spring 42b, the motor 43, and the leaf spring 42a are arranged in series in the axial direction, so compared to a linear compressor in which a cylinder is arranged in a conventional motor, Although the diameter is small, the axial length becomes long. However, by arranging the shafts so as to face in the horizontal direction, the overall height can be lowered as compared with the conventional compressor. As a result, when mounted on the refrigerator, the volume of the machine room that houses the compressor can be reduced, and the volume of the refrigerator can be increased.
[0069]
Moreover, since the movable portion 58 is securely supported by the leaf springs 42a and 42b, the weight of the movable portion 58 does not act as a contact load between the piston 52 and the cylinder 51 even when the compressor is placed horizontally. It is possible to prevent a decrease in efficiency due to an increase in dynamic loss and a decrease in reliability due to friction.
[0070]
(Embodiment 3)
FIG. 8 is a sectional view of a linear compressor according to Embodiment 3 of the present invention.
[0071]
In FIG. 8, the piston 71 and the mover 31 are connected via a retractable rod 72.
[0072]
The retractable rod 72 is composed of a rod-shaped elastic body with a thin diameter so as to have flexibility and elasticity in the lateral direction while giving rigidity sufficient to support a load in the axial direction, specifically stainless steel or spring steel. It is made of a metal material having elasticity and rigidity.
[0073]
In addition, since structures other than the retractable rod 72 are exactly the same as those in FIG. 6, the same portions are denoted by the same reference numerals and detailed description thereof is omitted.
[0074]
The operation of the linear compressor configured as described above will be described below.
[0075]
Since the piston 71 and the mover 31 are connected to each other by a flexible tiltable rod 72 in the lateral direction, even if the reciprocating shaft 32 of the mover 31 and the axis of the cylinder 51 are slightly displaced, the tiltable rod 72 is connected to the piston 71. Since movement in a direction parallel to the axis and deformation in the rotation direction are possible, the piston 71 and the cylinder 51 can be prevented from being twisted, and friction and wear can be prevented.
[0076]
(Embodiment 4)
FIG. 9 is a cross-sectional view of a linear compressor according to Embodiment 4 of the present invention.
[0077]
In FIG. 9, the cylinder 81 is provided with a gas passage 81b that communicates from the high-pressure chamber 54a of the cylinder head 54 to a position facing the piston 52 of the inner surface 81a, and a gas bearing 82 is formed. Further, the linear compressor of the present embodiment does not require the lubricating oil, and therefore does not include the lubricating oil 4 and the capillary tube 66 shown in FIG.
[0078]
In addition, since the structure of those other than this is completely the same as FIG. 6, 7, the same code | symbol is attached | subjected about the same structure and detailed description is abbreviate | omitted.
[0079]
The operation of the linear compressor configured as described above will be described below.
[0080]
In the gas bearing 82, the piston 52 floats with respect to the cylinder 81 by the high-pressure refrigerant gas supplied from the high-pressure chamber 55 a of the cylinder head 55.
[0081]
Normally, the gas bearing 82 has very little friction to prevent contact between solids, but it is necessary to flow a large amount of gas to support a large load, and when used between the piston 52 and the cylinder 81 of the compressor. In some cases, gas leakage was the cause of the loss. However, in the present invention, since the mover is supported by the leaf spring, only a small load acts on the gas bearing 82. In addition, since the piston 52 can be prevented from tilting with respect to the cylinder 81 by the ball joint 61, it is possible to reduce both sliding loss and leakage loss, improving the efficiency of the compressor, and reliability due to friction. Can be prevented.
[0082]
Furthermore, by not using the lubricating oil, since the lubricating oil does not adhere to the heat transfer surface of the heat exchanger of the cooling system, the heat transfer with the refrigerant can be improved, and the efficiency of the cooling system can be improved.
[0083]
(Embodiment 5)
FIG. 10 is a cross-sectional view of a linear compressor according to Embodiment 5 of the present invention.
[0084]
In FIG. 10, the cylinder 91 is made of a material having self-lubricating properties. Specifically, a diamond-like carbon film is applied to the sliding surface. Further, the linear compressor of the present embodiment does not require the lubricating oil, and therefore does not include the lubricating oil 4 and the capillary tube 66 shown in FIG.
[0085]
Since the other configuration is exactly the same as that in FIG. 6, the same components are denoted by the same reference numerals and detailed description thereof is omitted.
[0086]
The operation of the linear compressor configured as described above will be described below.
[0087]
Since the sliding portion of the piston 52 and the cylinder 91 has a small load, the self-lubricating property of the surface of the cylinder 91 prevents wear without using lubricating oil, and ensures the reliability of the sliding portion.
[0088]
Further, since no lubricating oil is used, no viscous friction acts between the piston 52 and the cylinder 91, so that the efficiency can be improved.
[0089]
In the present embodiment, a diamond-like carbon film is used, but the same effect can be obtained by using a material added with a self-lubricating material such as carbon or a material such as PTFE.
[0090]
In the present embodiment, the self-lubricating material is used for the cylinder 91, but the same effect can be obtained even if it is used for the piston 52.
[0091]
(Embodiment 6)
FIG. 11 is a cross-sectional view of a linear compressor according to Embodiment 6 of the present invention.
[0092]
In FIG. 11, the piston 96 is a ceramic material, specifically, a surface of which tungsten carbide coating is applied. Further, the linear compressor of the present embodiment does not require the lubricating oil, and therefore does not include the lubricating oil 4 and the capillary tube 66 shown in FIG.
[0093]
In addition, since the structure of those other than this is completely the same as FIG. 6, the same code | symbol is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0094]
The operation of the linear compressor configured as described above will be described below.
[0095]
Since the tungsten carbide film having high wear resistance is provided on the surface of the piston 96, the wear can be prevented and the reliability of the sliding portion can be ensured without using lubricating oil.
[0096]
Further, in this embodiment, since no lubricating oil is used, viscous friction can be reduced.
[0097]
In this embodiment, tungsten carbide is used as the ceramic material, but the reliability can be improved by using other ceramic materials such as zirconia.
[0098]
【The invention's effect】
  As described above, the invention according to claim 1 can reduce the loss by eliminating the sliding portion.In addition, the reliability can be improved by reducing the stress of the leaf spring.
[0100]
  further,Assembling is possible in a state in which the air gap is securely secured.
[0101]
  Also,Claim 2The invention described in 1 can reduce the loss by reducing the load applied between the piston and the cylinder.
[0102]
  Also,Claim 3The invention described in 1 can prevent the piston and the cylinder from being twisted, reduce the sliding loss, and improve the reliability.
[0103]
  Also,Claim 4The invention described in 1 can prevent the piston and the cylinder from being twisted, reduce the sliding loss, and improve the reliability.
[0104]
  Also,Claim 5The described invention can expand the internal volume of the refrigerator.
[0105]
  Also,Claim 6The invention described in 1 can improve the efficiency of the cooling system.
[0106]
  Also,Claim 7The invention described in 1 can improve efficiency and reduce reliability by reducing friction.
[0107]
  Also,Claim 8The invention described in 1 can improve efficiency and reduce reliability by reducing friction.
[0108]
  Also,Claim 9The invention described in 1 can improve efficiency and reduce reliability by reducing friction.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a linear motor according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram showing a relative position of a leaf spring according to the embodiment;
FIG. 3 is a perspective view of the linear motor according to the embodiment.
FIG. 4 is a schematic diagram showing the operation principle of the linear motor according to the embodiment;
FIG. 5 is a schematic diagram showing a current flow of the linear motor according to the embodiment;
FIG. 6 is a side sectional view of a linear compressor according to a second embodiment of the present invention.
7 is a horizontal sectional view of FIG.
FIG. 8 is a side sectional view of a linear compressor according to a second embodiment of the present invention.
FIG. 9 is a side sectional view of a linear compressor according to a third embodiment of the present invention.
FIG. 10 is a side sectional view of a linear compressor according to a fourth embodiment of the present invention.
FIG. 11 is a side sectional view of a linear compressor according to a fifth embodiment of the present invention.
FIG. 12 is a cross-sectional view of a conventional linear compressor
[Explanation of symbols]
25 Stator
26a, 26b Magnet wire
27 Fixed iron core
29a, 29b, 29c Magnetic pole
31 Mover
34 Movable iron core
35a, 35b Magnet
42a, 42b leaf spring
42f, 42g arm
51 cylinders
52 piston
57 Fixed part
58 Moving parts
61 Ball joint
71 piston
72 retractable rod
81 cylinders
82 Gas bearing
91 cylinders
96 piston

Claims (9)

A stator comprising a fixed iron core and a magnet wire engaged with the fixed iron core, a mover provided with a movable iron core and a magnet, and arranged on both sides in the swinging direction of the mover, part of which is attached to the mover The other part of the leaf spring is attached to the stator, and the movable member is opposed to the stator while maintaining a certain gap with respect to the stator, and is supported so as to be swingable in the axial direction. The movable element is substantially cylindrical, and the leaf spring has a plurality of arm portions extending from a fastening and fixing position to the movable element to a fastening and fixing position to the stator, and all the arm portions The leaf springs arranged on both sides of the movable element are rotated in the rotational direction so that the positions of the arm portions do not coincide with each other when viewed from the axial direction. linear was characterized by mounting shifting Over data. The linear motor according to claim 1 , a cylinder that shares an axis with the linear motor and forms a fixed portion together with the stator, and a reciprocatingly inserted into the cylinder and forms a movable portion together with the mover A linear compressor comprising a piston and driven at a frequency in the vicinity of a resonance frequency determined by a mass of the fixed part and the movable part and a spring constant of the leaf spring. The linear compressor according to claim 2, wherein the piston and the mover are connected via a ball joint. The linear compressor according to claim 2, wherein the piston and the mover are connected via a retractable rod made of an elastic body. The linear compressor according to any one of claims 2 to 4 , wherein the swinging direction of the mover is substantially horizontal. The linear compressor according to claim 5 , wherein no lubricating oil is used. The linear compressor according to claim 6 , wherein the sliding portion of the piston and the cylinder is configured by a gas bearing. The linear compressor according to claim 6 , wherein a self-lubricating material is used for at least one of the piston or the cylinder. The linear compressor according to claim 6 , wherein a ceramic material is used for at least one of the piston and the cylinder.

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