JPH033993A - Compressor - Google Patents

Abstract

PURPOSE:To perform the preset rotating motion with high reliability and lower the cost by providing an inner gear section on the inner periphery of the end section of a cylinder, and providing an outer bearing section coupled with the inner gear section concentrically with the axis of a piston to constitute a rotating means. CONSTITUTION:When a cylinder 6 or a piston 9 serving as the power input side receives the power and is rotated, an outer gear section 21 and an inner gear section 22 are coupled, the piston 9 or the cylinder 6 serving as the driven side is driven and rotated in the preset relationship, and the rotary motion required for compression is attained. The mechanism using an inner gear mechanism to rotate the piston 9 or the cylinder 6 has no portion with weak rigidity on a main body section like an Oldham's ring although the gear mechanism is also stored in the cylinder 6, and the reliability against a load is high. the components to be used are only the outer gear section 21 and the inner gear section 22, the structure is simple, the number of components can be small, and the cost can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a compressor that compresses a medium to be compressed, such as a refrigerant gas.

(Prior art) Compressors used in refrigeration cycles such as air conditioners and refrigerators generally use a reciprocating type that uses a reciprocating piston or a rotary type that rotates a disc-shaped piston eccentrically within a cylinder. .

However, all of these types of compressors have the disadvantage that the compressor section has a complicated structure and a large number of parts.

Therefore, recently, a compressor called a helical blade type has been proposed. This compressor unit is constructed by combining a cylindrical cylinder with one end on the suction side and the other end on the discharge side, and a cylindrical piston with spiral blades on its outer circumferential surface. It is.

Specifically, the piston is provided with a groove on its outer circumferential surface, the pitch of which decreases from the suction side to the discharge side, into which a spiral blade with an outer diameter that corresponds to the inner diameter of the cylinder is inserted and removably inserted. It is an insert. This piston is inserted into the cylinder and placed so that the blade is in contact with the inner peripheral surface of the cylinder, and the entire piston is positioned eccentrically from the axis of the cylinder so that a portion of the outer peripheral surface is in contact with the inner peripheral surface of the cylinder. Place it in The bearings support both ends of the cylinder so as to be rotatable around the axis. Also, both ends of the piston are rotatably supported using the same bearing, so that they can pivot relative to the cylinder. Furthermore, an autorotation mechanism (autorotation means) for rotating the piston in synchronization with the rotation of the cylinder is provided between the piston and the cylinder.

In such a helical blade type compressor, the cylinder rotates in the normal direction around its axis by rotating the cylinder. Further, the piston rotates around the axis of the cylinder while maintaining contact with the inner peripheral surface of the cylinder, and rotates in synchronization with the rotation of the cylinder. Then, the volume of the crescent-shaped compression chamber inside the cylinder partitioned by the blades changes continuously in the direction of contraction. As a result, refrigerant gas is sucked in from the suction side of the cylinder. This refrigerant gas is compressed while moving to the discharge side of the cylinder, and then the compressed refrigerant gas is discharged from the discharge side.

By the way, conventionally, the rotation mechanism of this compressor has
An Oldham ring is used that is movable in two orthogonal directions on a plane perpendicular to the axis of the cylinder. A specific structure includes, for example, inserting the center of the Oldham ring into the piston end so that it can slide freely in one orthogonal direction using a joint such as a full-length projection or a protrusion, and the outer peripheral part of the Oldham ring into the cylinder end.
In the other direction, it is mounted so as to be slidable with a pin or a joint such as a pin.

(Problems to be Solved by the Invention) In such a helical blade type compressor, the entire Oldham ring including the joint portion must be housed inside the cylinder due to the structure of the compressor. For this reason, the Oldham ring (1! including the hand) has no choice but to be made small.

By the way, a compressor generates a fairly large load because it compresses a medium to be compressed, such as refrigerant gas.

However, with the Oldham ring, there is a high risk that due to the earlier demand for miniaturization, the main body may have thin parts that pose strength problems or parts that receive concentrated stress.

For this reason, the reliability of the Oldham ring against the load has become a problem.

This invention was made with attention to these circumstances,
The purpose is to provide a compressor that can perform a predetermined rotational motion with high reliability.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the compressor of the present invention provides an internal gear portion along the circumferential direction on the inner periphery of the end of the cylinder. An external gear part is provided on the outer periphery of the end of the piston in correspondence with the position of the internal gear part, and is concentric with the axis of the piston and engages with the internal gear part according to the internal engagement between the piston and the cylinder. , constitutes a rotation means.

(Function) According to the compressor of the present invention, when the cylinder or piston serving as the power input end receives power and rotates,
The external gear part and the internal gear part fit together, causing the piston or cylinder on the driven side to follow in a predetermined relationship and rotate on its own axis, thereby establishing the turning motion necessary for compression.

A structure in which the piston or cylinder rotates on its own axis using an internal gear mechanism does not have a weakly rigid part in the main body like an Oldham ring, even if the piston or cylinder is housed in the same cylinder, so it is less reliable under load. is expensive.

In addition, since only the external gear portion and the internal gear portion are required, the structure is simple and the number of parts is also reduced, resulting in cost reduction.

(Example) The present invention will be described below based on an example shown in FIGS. 1 and 2. FIG. 2 shows a hermetic compressor to which the present invention is applied, for example, used in a refrigeration cycle, where 1 is a horizontally elongated hermetic case, and 2 is an electric motor section disposed at the center of the hermetic case 1. The electric motor section 2 includes a stator 3 fixed to the inner peripheral surface of the sealed case 1 and an annular rotor 4 provided inside the stator 3.

Further, a compressor section 5 is disposed within the sealed case 1 between the ends of the sealed case 1. Regarding the compressor section 5, reference numeral 6 is a cylinder disposed between the ends of the middle stage of the closed case 1.

The cylinder 6 is composed of a cylindrical member having a long length, and the rotor 4 is concentrically fixed to the outer peripheral surface of the cylinder 6.

Both ends of the cylinder 6 are fitted into bosses 7a and 8a of bearings 7 and 8 fixed to both ends of the closed case 1, and are rotatably supported. That is, the cylinder 6 is supported rotatably around the axis. In addition,
Both ends of the cylinder 6 are made airtight by fitting into the boss portions 7a and 8a.

Further, a piston 9 is inserted into the cylinder 6. The piston 9 is formed from a cylindrical body having an outer diameter smaller than the inner diameter of the cylinder 6. Furthermore, support shafts 10 and 11 are integrally provided at the centers of both ends of the piston 9, respectively. The piston 9 is disposed at a position eccentrically downward, for example, by a distance I4e with respect to the axis of the cylinder 6, thereby bringing a part of the outer circumferential surface of the piston 9 into line contact with the inner circumferential surface of the cylinder 6. There is. The support shaft 10.11 of this piston 9 is the boss portion 7a.

The piston 9 is rotatably fitted into a bearing hole 12.13 formed in the cylinder 8a, and supports the piston 9 in a rotatable manner relative to the cylinder 6. Note that the bearing portion 8 includes a cylinder 6 and a piston 9.
A suction passage 14 is formed which communicates with the space between the
The right side of the cylinder 6 is the suction side. However, 15 is a suction pipe (connected to the refrigeration cycle equipment) connected to the suction path 14.

Also, on the outer peripheral surface of the piston 9, the suction side of the cylinder 6 (
A spiral groove 16 is formed at a pitch that decreases from the right side to the discharge side (left side). A spirally formed blade 17 is fitted into the groove 16 so as to be freely removable and removable. The blade 17 has an outer diameter corresponding to the inner diameter of the cylinder 6, and its entire outer circumferential end is in contact with the inner circumferential surface of the cylinder 6. The blade 17 partitions the space formed between the cylinder 6 and the piston 9 into a plurality of crescent-shaped compression chambers 18 . Of course, the volume of the compression chamber 18 gradually decreases from the suction side to the discharge side of the cylinder 6 due to the pitch of the grooves 16.

On the other hand, an internal gear type synchronous rotation mechanism 19 (corresponding to rotation means) is provided at the end of the piston 9 on the discharge side of the cylinder 6. To explain the synchronous rotation mechanism 19, 20 is a stepped portion formed at the end of the piston 9 on the discharge side.

The stepped portion 20 is, for example, formed by cutting out the end portion of the piston 9 in the same manner as the support shaft 10. As shown in FIG. 1, a ring-shaped outer li! 2@
A wheel 21 (corresponding to an external gear portion) is press-fitted and fixed. Thereby, the external gear 21 is mounted concentrically with the axis of the piston 9. Further, the outer ω gear 21 has a structure in which, for example, a plurality of teeth 21a having a root circle set to be the same as the outer diameter of the piston 9 are provided at equal pitch intervals.

Further, 22 corresponds to the position of the tooth 21a of the external gear 21,
This is an internally toothed hole (corresponding to an internal gear) bored in the peripheral wall of the cylinder 6. This hole 22 is formed by the external gear 2.
Holes of the same number as the number of teeth are provided at equal pitch intervals along the circumferential direction, thereby forming an internal gear on the inner circumferential surface of the cylinder 6. Then, the hole 2 having these eccentric relationships
2 and the teeth 21a of the external gear 21 are in mesh with each other at a position of contact between the cylinder 6 and the piston 9, and the piston 9 is rotatably coupled to the cylinder 6. As a result, the rotation of the cylinder 6 (rotation around the axis) given from the electric motor section 2 is transferred to the piston 9 by meshing.
The piston 9 is rotated in synchronization with the cylinder 6 while maintaining its inscribed state. In other words, by rotating the piston 9, the volume of the compression chamber 18 can be continuously varied in the discharge side direction, and the refrigerant gas (
After compressing the medium to be compressed, it can be discharged into the sealed case 1 from the hole 22 of the synchronous rotation mechanism 19 which also serves as a discharge hole.

In addition, in FIG. 2, 23 is a discharge pipe (connected to the refrigeration cycle equipment) connected to the peripheral wall of the sealed case 1.

Thus, in the compressor configured in this way, by energizing the electric motor section 2, the rotor 4 is moved to the cylinder 6.
It rotates forward together with the cylinder 6 around the axis of the cylinder. At the same time, the rotation of this cylinder 6 is
Piston 9 through meshing between hole 22 and external gear 21
will be transmitted to. Here, since the teeth 21a of the inscribed external gear 21 and the hole 22 of the cylinder 6 have the same number of teeth, the piston 9 maintains a state in which it is partially in contact with the inner peripheral surface of the cylinder 6, and also It rotates around the axis of the cylinder 6 while rotating in synchronization with the rotation. Then, the crescent-shaped compression chamber 18 in the cylinder 6 partitioned by the blade 17 continuously changes in the direction of contraction with respect to the discharge side direction.

As a result, refrigerant gas is sucked into the cylinder 6 from the suction pipe 15, and is compressed by changing the volume of the compression chamber 18. Note that the compressed refrigerant gas flows through the hole 22. It is discharged from the discharge pipe 23 to the outside through the sealed case 1.

Here, the synchronous rotation mechanism 19 housed inside the cylinder 6
Since it is an internal gear type, there is no need to create a part with weak rigidity on the external gear side, which is the main body, as is clear from Fig. 1.

Therefore, the synchronous rotation mechanism 19 has high reliability against the load of the compressor. In addition, since it is only a combination of the external gear 21 serving as external teeth and the hole portion 22 serving as internal teeth, it is structurally simple. In addition, the number of parts can be reduced, so
It has the advantage of being inexpensive.

Moreover, by setting the number of teeth on the external and internal teeth sides to be the same and rotating the piston 9 in synchronization with the rotation of the cylinder 6, there is an advantage that the sliding loss of the piston 9 can be reduced. .

In addition, in one embodiment, since the discharge hole for discharging compressed gas was used, a hole was used instead of a general gear on the internal gear side, but it is of course possible to use an internal gear inside the membrane. . In this case, the internal gear may be press-fitted into the cylinder.

Of course, the discharge hole will be provided separately.

Further, in one embodiment, an externally toothed gear is used on the externally toothed side, but a plurality of teeth may be provided protrudingly on the outer peripheral surface of the piston itself to form the externally toothed portion. It goes without saying that the shapes of the external teeth and internal teeth that mesh with each other can be modified in various ways, and the numbers of teeth that mesh with each other may not be the same number but may be different numbers.

Furthermore, in one embodiment, the present invention was applied to a compressor in which the cylinder rotates around the axis and the piston rotates relative to it; however, conversely, the piston rotates around the axis and the cylinder rotates. The present invention may be applied to a helical blade type compressor.

[Effects of the Invention] As explained above, according to the present invention, even if the rotation means using an internal gear type mechanism is housed in the same cylinder, the main body does not have rigidity like an Oldham ring. No more developing weak areas.

Therefore, the reliability of the compressor against load is high.

In addition, since only the external gear part and the internal gear part are required, the structure is simple. Moreover, since the number of parts can be reduced, there is an advantage that costs can be reduced.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG.
FIG. 2 is a cross-sectional view of the rotation mechanism taken along line I-1, and FIG. 2 is a cross-sectional view showing a closed type compressor to which the present invention is applied. DESCRIPTION OF SYMBOLS 1... Sealed case, 2... Electric motor part, 5... Compressor part, 7, 8... Bearing part, 9... Piston, 15...
... Suction pipe, 16... Groove, 17... Blade, 1
8...Compression chamber, one...Synchronized rotation mechanism (rotation means)
, 21... External gear (external gear part), 22... Hole (internal gear part), 23... Discharge pipe.

Claims (1)

[Claims] a cylindrical cylinder with one end on the suction side and the other end on the discharge side; a cylindrical piston inserted into the cylinder eccentrically so that a portion of the outer circumferential surface touches the inner circumferential surface of the cylinder; A spiral groove is provided on the outer peripheral surface of the piston and is formed at a pitch that decreases from the suction side to the discharge side. a helical blade; a supporting means for supporting the ends of the piston and the cylinder so that one end of the piston and the cylinder is rotatable about the axis, and the other end of the cylinder is rotatable relative to the end of the piston and the cylinder; In the compressor, the compressor includes an autorotation means for causing the other rotatably supported side to rotate in accordance with the rotation of the side that rotates about the center, the autorotation means including an autorotation means that rotates around the inner circumference of the end of the cylinder along the circumferential direction. an internal gear part provided in the cylinder; A compressor comprising an external gear part that fits with the teeth of the internal gear part.