JP2995022B2 - Compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor used as a drive source for a cooling device or the like, and more particularly to a compressor called a linear compressor having excellent durability.

[0002]

2. Description of the Related Art FIG. 5 is a structural view of a linear compressor.
This compressor is a so-called opposed type in which two sets of compression units Ua and Ub are incorporated in a cylindrical case 1. Vibration can be canceled by moving the pistons of the two units in opposite phases. In applications where vibration is allowed, a unit called a single unit having only one unit may be used.

The units Ua and Ub have the same configuration.
The unit Ua will be described below. The piston 3 is inserted into the cylinder 2 integrated with the case 1 and the piston 3
The one end and the other end of the shaft 4 that holds the shaft 4 are supported on the case 1 by leaf springs 5 and 6, respectively, and the coil 8 is mounted on a bobbin 7 fixed at an arbitrary position between the one end and the other end of the shaft 4. While being wound, the coil 8 is loosely inserted into the groove 9 a of the yoke 9. Reference numeral 9b denotes a permanent magnet attached to the yoke 9, and reference numeral 10 denotes a pipe communicating between a cooling device (not shown) and the cylinder 2, and the pipe 10 and the cylinder 2 are filled with a refrigerant.

When an alternating current is applied to the coil 8, the leaf spring 5,
The piston 3 supported by 6 reciprocates in an alternating cycle, and the pressure of the cylinder 2 changes by Pr ± PΔ. Here, Pr is the internal pressure (back pressure) of the case 1. Here, leaf springs 5 and 6
Has high rigidity in the radial direction (X direction in the figure) and weakness in the axial direction (Y direction in the figure). That is, since the piston 3 is easy to move in the Y direction and hard to move in the X direction, a minute clearance between the piston 3 and the cylinder 2 can be maintained, and the piston 3 and the cylinder 2 are brought into a non-contact state to wear or stick. Such obstacles can be avoided and the durability can be improved.

[0005]

However, in such a conventional compressor, a shaft 4 having a piston 3 attached to one end is supported on the case 1 by two leaf springs 5 and 6. For the reasons described below, the non-contact state between the piston 3 and the cylinder 2 may not be maintained in some cases, and there is a problem to be improved in that high durability can be obtained in any environment.

FIG. 6 shows two leaf springs 5 and 6 and a shaft 4.
FIG. 2 is a conceptual diagram of a main part showing a piston and a piston. Where Pa
Is the support point of the shaft 4 by the leaf spring 5 on the left side of the drawing, Pb
Is the point at which the shaft 4 is supported by the leaf spring 6 on the right side of the drawing, A is the distance from Pa to the piston 3, B is the distance from Pb to the piston 3, A is greater than B, and B is greater than 0 ( A>B> 0).

Now, consider the case where a lateral force F is applied to the piston 3 in the illustrated direction. Such a side force F is, for example,
This occurs when the pressure distribution on the pressure receiving surface of the piston 3 is biased or when an external force such as gravity or impact force is applied. The two supporting points Pa and Pb have a drag R according to the side force F.
1 and R2, respectively, and these drags R1 and R2
Can be written as follows: R1 = | B / (AB) || F |... R2 = | A / (AB) || F |> | F | ... From these equations, the following relationship is obtained: R1 + R2> | F |

The equation is that when a lateral force F is applied to the piston 3,
This means that the two plate springs 5 and 6 must bear a resistance (R1 + R2) greater than the side force F.
Therefore, in the above-described conventional compressor, the rigidity of the leaf springs 5 and 6 in the radial direction (X direction in FIG. 5) may be insufficient depending on the magnitude of the resistance, and the piston 3 and the cylinder 2 come into contact with each other and have durability. There is a problem of impairing the performance.

Here, FIG. 7 shows an ideal conceptual diagram in which the configuration of FIG. 6 is modified. The difference from FIG. 6 is that two support points P
The point is that the piston 3 is located between the points a and Pb.
Also in this configuration, when the lateral force F is applied to the piston 3, the drags R1 and R2 are generated at the two support points Pa and Pb, respectively, but the value obtained by adding R1 and R2 does not exceed F. This is because if the distance from Pa to the piston 3 is C and the distance from Pb to the piston 3 is D, and [C = D], then R1 = R2 = F / 2.

FIG. 8 shows an example in which the configuration of FIG. 7 is materialized. In this example, the cylinder 11 is supported on the case 1 by two leaf springs 5 and 6, and the piston 12 is fixed to the case 1. . Reference numerals 13 and 14 denote flow paths, and the end of the flow path 14 is connected to a cooling device (not shown). According to this, since the point of action of the external force is located substantially in the middle between the two support points Pa and Pb, the above equation can be applied, and the rigidity of the leaf springs 5 and 6 in the radial direction does not occur. Therefore, it is advantageous in that the non-contact state between the piston 12 and the cylinder 11 can be maintained and the durability can be improved, but on the other hand, it is necessary to form the flow path 13 in the piston 12, and the volume of the flow path 13 However, there is a problem that the compression efficiency is reduced due to a dead volume.

Accordingly, an object of the present invention is to maintain the non-contact state between the piston and the cylinder by bringing the point of action of the external force as close to the ideal position as possible without reducing the compression efficiency.

[0012]

The invention according to claim 1 is
And two leaf springs which are furnished in a cylindrical casing, of the two flexible in the axial direction of the case by the leaf spring, and supported piston so as to be rigid in the radial direction of the case, of the case to the piston and a driving means for applying an axial driving force, the driving means, integral with the bobbin and the piston, and a coil wound around the tip of the bobbin, Ruyo over to hold the electromagnets opposed to the coil And the bobbin is attached to a first shaft supported by the case by one of the two leaf springs or a member integral with the first shaft, and the other of the two leaf springs One end of a connecting rod is attached to the second shaft or a member integral with the second shaft supported by the case, and the connecting rod is passed through a through hole formed in the yoke, and the other of the connecting rod is The is characterized in that mounted on the member integral with the first shaft or the first shaft.

According to this, the piston can be located near the point where the other leaf spring supports the first shaft (or a member integral with the first shaft). Therefore,
The point of action of the external force is brought as close as possible to the ideal position (piston position in FIG. 7) to maintain the non-contact state between the piston and the cylinder, thereby improving durability and providing an extra flow path (see flow path 13 in FIG. 8). Since it is not required, there is no dead volume and no loss in compression efficiency.

According to a second aspect of the present invention, two leaf springs are provided inside a cylindrical case, and the two leaf springs make the case soft in the axial direction and rigid in the radial direction of the case .
And a driving means for applying a driving force in the axial direction of the case to the piston, the driving means comprising: a bobbin integrated with the piston; and a coil wound around a tip of the bobbin. in the compressor constructed in the Ruyo over click to hold the electromagnets opposed to the coil, together with the first shaft or the first shaft is supported by the case by one of the inner peripheral portion of the two leaf springs Attach the bobbin to the member of the other , the other of the two leaf springs
The second shaft or the second shaft and the integral member is supported on the casing by the inner peripheral portion, the first sheet is attached to the first shaft or the first shaft and the integral member
The shaft and the second shaft are integrated, and the integrated
The first shaft and the second shaft are connected to the inner peripheral portion of the yoke.
Through which the two leaf springs are connected to the support point by the inner periphery.
Allowed, and, the piston inside the second shaft one
And a part of the cylinder is partially
It is characterized by being located between the shaft and the piston .

According to this, in addition to the function of claim 1,
The support point between the two leaf springs can be rigidly connected, the assembling accuracy and rigidity can be improved, and the size can be reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. (1) FIG. 1 shows a first compressor of the present invention (claim 1).
It is a figure showing an example. Here, one of the two opposing units (see the unit Ua in FIG. 5) is shown, but it is not limited to the opposing unit. It may be a single unit.

In FIG. 1, reference numeral 20 denotes a cylindrical case. Inside the case 20, a first leaf spring 21, a second leaf spring 22, a yoke 23, a cylinder 24, a first shaft 2
5, the second shaft 26, the bobbin 27 and the like are mounted. Hereinafter, the connection relation of each part will be described.
The leaf springs 21 and 22 are assembled by stacking, for example, four leaf springs so as to obtain required spring characteristics. The outer peripheral portions of the first and second leaf springs 21 and 22 are in contact with the outer peripheral portion of the yoke 23, and the inner peripheral portion of the first leaf spring 21
The shaft 25 is held, and the inner peripheral portion of the second leaf spring 22
It holds the shaft 26.

The yoke 23 includes the first and second leaf springs 2.
1 and 22 each have an outer peripheral portion 23a whose both ends are in contact with each other, and an inner peripheral portion 23b formed to be shorter than the axial length of the outer peripheral portion 23a.
A bottomed hole 23c for loosely inserting the coil 28 wound around the distal end of the hole 23, and a through hole 23d located closer to the case 20 than the bottomed hole 23c are formed. In addition, 23e
Is a permanent magnet attached to the bottomed hole 23c.

A first plate member 29 is integrally attached to one end of the first shaft 25, and a second plate member 30 is also integrally attached to one end of the second shaft 26. The one plate member 29 and the second plate member 30 are integrally connected by a plurality of (two of them are shown in the figure) connecting rods 31 inserted with play into the through holes 23d of the yoke 23. ing.

Reference numeral 32 denotes a piston. The piston 32 is integrally attached to the first plate member 29 via the bobbin 27, and forms a variable volume chamber with the cylinder 24. Through a cooling device (not shown). In such a configuration, when an alternating current is applied to the coil 28, the coil 28 and the electromagnet 23
An electromagnetic force is generated between the bobbin 27 and the movable side of the movable bobbin 27.

Here, the bobbin 27 is connected to the first plate member 2.
9 and the piston 32 and the connecting rod 31
, The movement of the bobbin 27 in the left-right direction in the drawing is transmitted to the first plate member 29, the second plate member 30, and the piston 32. Since the first plate member 29 and the second plate member 30 are supported by the first leaf spring 21 and the second leaf spring 22 via the first shaft 25 and the second shaft 26, respectively, they are eventually passed through the coil 28. The piston 32 reciprocates in the cycle of the alternating current, and the chamber volume between the piston 32 and the cylinder 24 changes in the same cycle.

Now, comparing the configuration in FIG. 1 with the configuration in FIG. 7 at the beginning, one of the support points Pa in FIG.
The other support point Pb corresponds to a connection point between the second leaf spring 22 and the second shaft 26. 7 corresponds to the first shaft 25, the first plate member 29, the connecting rod 31, the second plate member 30, and the second shaft 26, and a slight difference between the two is in the position of the piston. . That is, in FIG. 7, it is located between the two support points Pa and Pb, but in FIG. 1, it is located closer to the other support point Pb. Now, assuming that the piston 32 in FIG. 1 is at the position of Pb, the drag forces R1, R2 generated at the two support points Pa, Pb are R1
= 0 and R2 = F. Therefore, as in the previous equation, R1
+ R2 = F, and the sum of the two drags does not exceed F.

Therefore, according to the present embodiment, the point of action of the external force can be made closer to the ideal position (between the two support points Pa and Pb), and the influence of the side force and the like acting between the piston 32 and the cylinder 24 can be obtained. And the piston 32 and the cylinder 2
4 can be avoided, and the durability can be improved. In addition, since no extra flow path (see flow path 13 in FIG. 8) is required, no dead volume is generated and the compression efficiency is not impaired. (2) FIGS. 2 and 3 show a second embodiment of the compressor according to the present invention (claim 1). Note that, here, one of the two opposing units (see unit Ua in FIG. 5).
However, a single unit may be used.

In FIG. 2, reference numeral 40 denotes a case, and 41 denotes a first case.
Leaf spring, 42 is a bobbin, 43 is a coil, 44 is a yoke,
45 is an electromagnet, 46 is a connecting rod, 47 is a plate, 48 is a second leaf spring, 49 is a piston, 50 is a cylinder, and 51 is a flow path. Connecting rod 4 between bobbin 42 and plate 47
6 and are connected together by a bobbin 42
The plate 47 and the plate 47 are supported by the case 40 by a first leaf spring 41 and a second leaf spring 48, respectively, and a piston 49 is integrally attached to the bobbin 42. Therefore, when an alternating current is applied to the coil 43, these components reciprocate at the cycle of the alternating current, and the piston 49
The chamber volume between the cylinder and the cylinder 50 changes in the same cycle.

The difference from the first embodiment lies in the position of the connecting rod 46. That is, in this embodiment, the bottomed hole 4 of the yoke 44
4a, a hole 44b is formed substantially as a through-hole.
The difference is that the connecting rod 46 is passed through 4b. Hole 44b
Is located on the magnetic flux path of the yoke 44, which may lead to non-uniform magnetic flux density. However, there is an advantage that the diameter of the yoke 44 can be reduced to reduce the size. (3) FIG. 4 shows a third embodiment of the compressor according to the present invention (claim 2).
It is a figure showing an example. Although one of the two opposing units is shown here (see the unit Ua in FIG. 5), a single unit may be used.

In FIG. 4, reference numeral 60 denotes a case, and 61 denotes a first case.
A leaf spring, 62 is a first shaft, 63 is a bobbin, 64 is a coil, 65 is a yoke, 66 is an electromagnet, 67 is a second shaft, 68 is a second leaf spring, 69 is a piston, 70 is a cylinder, and 71 is a flow path. der Ru. As is clear from the figure,
Similarly to the embodiment, the first and second leaf springs 61 and 62
For example, four sheets to obtain the required spring characteristics
Are assembled by laminating leaf springs. First and second
The leaf springs 61 and 62 are in contact with the yoke 65 at their outer peripheral portions.
Holding the first shaft 62 at the inner peripheral portion of the first leaf spring 61
Then, the second shaft 67 is held by the inner peripheral portion of the second leaf spring 68.
doing. Further, the yoke 65 is connected to the first and second plate bars.
61 and 62 have outer peripheral portions 65a at both ends thereof
Both are formed shorter than the axial length of the outer peripheral portion 65a.
It has an inner peripheral portion 65b. Then, the first shaft 62, the bobbin 63, the second shaft 67, and the piston 69
And the second shaft 67 and the piston 6
9, a cylinder 70 is mounted.

When an alternating current is applied to the coil 64, the first shaft 62, the bobbin 63, the second shaft 67, and the piston 69 reciprocate in synchronization with the frequency, and the first embodiment and the second embodiment differ from each other. In addition to achieving the same operation, in the present embodiment, the two supporting points of the first leaf spring 61 and the second leaf spring 68 are connected by the first shaft 62, the bobbin 63, and the second shaft 67. Compared with connecting with a thin connecting rod, rigidity and assembling accuracy are improved, and compactness can be achieved, which is effective in terms of practicality.

[0028]

According to the first aspect of the present invention, the point of application of the external force is made as close as possible to the ideal position (the piston position in FIG. 7), the non-contact state between the piston and the cylinder is maintained, and the durability can be improved. , Without dead volume,
An excellent effect of not impairing the compression efficiency can be obtained.

According to the second aspect of the present invention, in addition to the effects of the first aspect, it is possible to improve the assembly accuracy and rigidity and to achieve the effect of achieving downsizing.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a configuration diagram of a second embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a configuration diagram of a third embodiment.

FIG. 5 is a structural diagram of a linear compressor.

FIG. 6 is a conceptual diagram of a main part of FIG. 5;

FIG. 7 is an ideal conceptual diagram.

FIG. 8 is a substantial configuration diagram of FIG. 7;

[Explanation of symbols]

 Reference Signs List 20: case 21: first leaf spring (leaf spring) 22: second leaf spring (leaf spring) 23: yoke 23d: through hole 23e: electromagnet 25: first shaft 26: second shaft 27: bobbin 28: coil 31 : Connecting rod 32: piston 40: case 41: first leaf spring (leaf spring) 42: bobbin 43: coil 44: yoke 44 b: hole (through hole) 45: electromagnet 46: connecting rod 48: second leaf spring (plate) Spring) 49: Piston 60: Case 61: First leaf spring (leaf spring) 62: First shaft 63: Bobbin 64: Coil 65: Yoke 66: Electromagnet 67: Second shaft 68: Second leaf spring (leaf spring) 69: Piston 70: Cylinder

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-253185 (JP, A) JP-A-8-35730 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25B 9/14 520

Claims (2)

(57) [Claims] And two leaf spring 1. A decorated in a cylindrical case, and supported piston so as to be flexible in the axial direction of said casing by said two leaf springs, in the radial direction of the casing rigid, the A driving means for applying a driving force in the axial direction of the case to the piston, the driving means comprising: a bobbin integrated with the piston; a coil wound around the tip of the bobbin; and an electromagnet facing the coil. in the compressor constructed in the holding be Ruyo over click, one is attached to the bobbin member integrally with the first shaft or the first shaft is supported by the case by the two leaf springs, the two One end of a connecting rod is attached to a second shaft supported by the case by the other of the leaf springs or a member integral with the second shaft, and the connecting rod is passed through a through hole formed in the yoke. , Compressor, characterized in that the other end of the connecting rod attached to the member integral with the first shaft or the first shaft. And two plate springs wherein decorated in a cylindrical case, and supported piston so as to be flexible in the axial direction of said casing by said two leaf springs, in the radial direction of the casing rigid, the A driving means for applying a driving force in the axial direction of the case to the piston, the driving means comprising: a bobbin integrated with the piston; a coil wound around the tip of the bobbin; and an electromagnet facing the coil. in the compressor constructed in the holding be Ruyo over click, it is attached to the bobbin to the first shaft or the first shaft and the integral member is supported by the case by one of the inner peripheral portion of the two leaf springs A second support supported by the case by the other inner peripheral portion of the two leaf springs.
The first member is attached to a shaft or a member integral with the second shaft.
Attach a member integral with the shaft or the first shaft
The first shaft and the second shaft are integrated, and the integrated first and second shafts are
Through the inner circumference of the two leaf springs
Coupled to a support point and integrated with the piston inside the second shaft
And a part of the cylinder is disposed between the second shaft and the piston.
A compressor characterized by being located .