JPS63212790A - Compressor - Google Patents

Abstract

PURPOSE:To intensify compressive action, by providing a regulating means by which the rotation of a piston is regulated and further the revolution of the piston around the shaft center of a rotor is allowed, and a fixing means by which the discharge-side open end of a screw hole in the piston is opened when the piston moves in the axial direction. CONSTITUTION:A compression part 5 has a cylinder 7 having a screw hole 6, a piston 8, and a regulating means 9 by which the rotation of the piston 8 is regulated and further the revolution thereof around the shaft center of a rotor 4 is allowed. Since the sliding surface of a flange member 31 is made greater than the opening of the cylinder 7 on the discharge side 12, the fluid sent from the suction side 13 is given a discharge resistance, and is substantially compressed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a compressor for compressing refrigerant, etc., and particularly relates to a compressor for compressing refrigerant, etc. The present invention relates to a compressor for compressing refrigerant.

(Prior Art) An example of a compressor used in a refrigerating machine is a compressor as shown in FIG. 8.

As shown in the figure, this compressor includes an electric part and a compression part C in a sealed case 1.

The electric part consists of a stator d that is integral with a closed case a, and a rotor e that is located on the axis of the closed case a. The compression part consists of a cylindrical cylinder Q that rotates together with the rotor e on the axis of the rotor e, and a spiral groove formed along the axial direction on the inner surface of the cylinder g. mated,
It consists of a piston 1 that is prevented from rotating and revolves relative to the cylinder 9. In order to prevent the rotation of the piston i and allow it to revolve, in the above compressor, a pin j integrally provided in the fixed system is passed through the protrusion k of the piston 1 relative to the cylinder 9 in the radial direction. Accordingly, the piston i is caused to reciprocate relative to the bin j.

(Problems to be Solved by the Invention) The cylinder and piston have spiral surfaces fitted to each other to transfer refrigerant etc. from one side to the other.
However, when considering stable refrigerant transfer and sealing, it is necessary to keep the relative position of the cylinder and piston constant in the axial direction. That is, it is necessary to prevent the piston from moving in the axial direction with respect to the cylinder so that no shearing force is applied to the bottle.

It is also required to improve manufacturing and assembly efficiency. Furthermore, the cylinder and piston only transfer fluid from one side to the other, and there is no compression of the fluid in the transfer process.
Improvements are desired in this respect as well.

[Structure of the Invention] (Means for Solving the Problems) This invention aims to solve the above problems. The present invention includes an electric part provided in a sealed case, a cylinder provided along the axis of a rotor of the electric part and having a helical screw hole, and a helical screw fitted into the screw hole of the cylinder. a regulating means for regulating the rotation of the piston and allowing the piston to revolve around the axis of the rotor; and a regulating means for allowing the piston to move slightly in the axial direction, and for allowing the piston to move slightly in the axial direction and having a threaded hole in the cylinder during the movement. and a fixing means for opening the open end on the discharge side of the compressor.

(Function) When the rotor is rotated, the cylinder integrated with it is rotated. When the cylinder is rotated, the piston is prevented from rotating with respect to the cylinder by the restricting means, and performs a relative orbital motion. This revolving movement causes the fluid on the suction side to be sent to the discharge side via the cylinder. At this time,
Since the piston relative to the cylinder is allowed to move slightly in the axial direction by the fixing means, when the piston is moved to the discharge side, it is transferred from the FJArm between it and the fixing means to cover the discharge side opening of the cylinder. The fluid is squeezed and discharged. That is, the fluid is substantially compressed.

(Embodiment) A preferred embodiment of the compressor of the present invention will be described below based on the accompanying drawings.

In Fig. 1, 1 is a sealed case, inside which is a motorized part 2.
is provided.

The electric part 2 includes a stator 3 that is press-fitted into the sealed case 1 and a rotor 4 that is rotated by the stator 3.

A spiral compression section 5 is provided at the axial center of the rotor 4 of the electric section 2 . This compression part 5 includes a cylinder 7 having an elliptical cross section intersecting in the axial direction and having a spiral screw hole 6;
a helical screw-shaped piston 8 that is fitted into the screw hole 6;
A regulating means for regulating the rotation of the piston 8 and allowing it to revolve around the axis of the rotor 4, and a stopper member for preventing the cylinder 7 from moving in the axial direction with respect to the screw hole 6 of the cylinder 7. It has become.

As shown in FIGS. 2 and 3, the piston 8 consists of a rod-shaped body with a circular cross section, and its center 08 is located at a distance ε from the center 0.
It is formed by twisting in a spiral while maintaining the

On the other hand, the cross section of the screw 60 of the cylinder 7 has an elliptical shape 10 with the centers 06 of semicircular parts having the same diameter as the diameter of the piston 8 separated from the center O by a distance of 12ε. 10, it is formed into a shape twisted 360 degrees around the center O.

As shown in Figure 5, 360y1 twisted 1 of screw hole 6
Assuming that the length of the pitch is L, the length of one pitch of the piston 8 is L/2, and the total length is L, as shown in FIG. The outer peripheral surface 7b of the cylinder 7 is formed to have a circular cross section, and as shown in FIG.
It is press-fitted into place.

A bearing member 15 is fitted onto the suction side 13 of the rotor 4 on the axis of the rotor 4, and the inner peripheral surface 15a of the bearing member 15 allows the suction side 13 of the cylinder 7 to rotate freely. They are designed to fit together.

The shaft bearing member 15 has seven flange 15 at the end on the suction side 13 side.
a, and is formed to a length such that the entire body including the flange 15a is housed in the space A of the inner circumferential surface of the stator 3.

On the other hand, a cover 1 is fixed to the end face of the suction side 3 of the sealed case 1 on the axis of the rotor 4, and is fixed to the end face in close contact with the seven flange 15a, and forms a suction chamber 30 inside.
7 is provided. A suction vibe 22 for refrigerant or the like is connected to the suction chamber 30 .

As described above, by making the outer diameter d of the seven flange 15 and the cover 17 smaller than the inner diameter D1 of the stator 3, it is possible to significantly reduce the axial length of the sealed case 1.

As shown in FIGS. 1 and 7, the piston 8 is provided with its suction side end 8a protruding into the cover 17, and the suction side end 8a contacts and slides against the suction side end surface 7C of the cylinder 7. It forms a head with a flat surface. The head 8a, which has the suction side end 8a as the head 8a, is prevented from rotating relative to the piston 8 by the regulating means 9, and is allowed to revolve.

As shown in FIG. 1, this regulating means 9 is rotatably supported by a fixed bottle 18 supported by a bearing member 15 and a cover 17111, and is fitted into a radial hole 19 of the head 8a. The rotation of the cylinder 7 causes the head 8a of the piston 8 to slide along the swing bin 2o and reciprocate around the fixed bin 18, so that the rotor 4 The piston 8 is not rotated about its axis, but is caused to revolve relative to the cylinder 7. The sealed case 1 has a discharge g! which communicates with the discharge side 13. 22 are connected.

On the other hand, the other end of the cylinder 7 is penetrated to the discharge side 12 of the rotor 4, as shown in FIGS. 1 and 7, and a flange member 31 that slides and sits on the penetrated end surface 7d is integrated It is attached. In this embodiment, the integration is performed by screws, but it is natural to prevent the flange member 31 from falling off using a knock pin, a retaining ring for the shaft, or the like after the screws are fastened.

Here, the flange member 31 serves as a fixing means.

Further, the total length between the head 8a and the flange member 31 relative to the total length of the cylinder 7 is L+e, which is slightly longer by e, thereby allowing the piston 8 to move in the axial direction with respect to the cylinder 7.

Furthermore, since the sliding surface of the flange member 31 is formed larger than the opening of the discharge side 12 of the cylinder 7, the fluid sent from the suction side 13 is discharged from the gap corresponding to the above-mentioned dimension e. It turns out.

That is, since a discharge resistance is applied to the fluid to be transferred, the fluid is substantially compressed during the force transfer process.

Next, the operation of this embodiment will be explained.

When the rotor 4 of the electric part 2 is rotated, the cylinder 7 is rotated accordingly. When the cylinder 7 rotates, the helical screw-shaped piston 8 fitted into the helical hole 6 is prevented from rotating by the regulating means 9. At this time cylinder 7
Since the piston 8 rotates together with the rotor 4, the piston 8 revolves around the axis of the rotor 4 relative to the cylinder 7. A cylinder v7a is formed between the screw hole 6 of the cylinder 7 and the piston 8, and the cylinder chamber 7a moves sequentially in one direction along the spiral screw hole 6 due to the rotation of the cylinder 7 and the revolution of the piston 8. I come to do it.

Therefore, 1. Refrigerant gas from the suction pipe 21 that enters between the cylinder 7 and the piston 8 from the suction port (not shown) of the cover 17 is sequentially transferred along the spiral thread 60 of the cylinder 7 and discharged. It is discharged from side 13 via discharge pipe 22 .

The regulating means 9 that regulates the orbital movement of the piston 8 is the rocking motion of its swinging pin 20 and the reciprocating sliding movement of the head 8a of the piston 8 along the pin 20. Strictly speaking, the restricting means 9 restricts the orbital movement of the piston 8. Instead, the piston 8 performs a relative revolution movement while swinging from side to side, but even this movement can perform the fluid pumping function without any problems.

In the above-described embodiment, suction is performed from the bearing portion 14 side, but it is of course possible to discharge in the opposite direction by rotating the rotor 4 in the opposite direction or by reversing the twisting direction of the spiral. Furthermore, although the fixed bottle 18 and the swing bottle 20 have been described as examples of the regulating member 9, any member may be used as long as it allows the piston 8 to revolve.

[Effects of the Invention] As is clear from the detailed description above, there is provided an electric part provided in a sealed case, and a cylinder provided along the axis of the rotor of the electric part and having a spiral screw hole. and a spiral threaded piston fitted into a tapped hole of the cylinder;
A regulating means for regulating the rotation of the piston and allowing the piston to revolve around the axis of the rotor, and a regulating means for blocking the discharge side open end of the threaded hole of the cylinder and allowing slight axial movement of the piston. Since the compressor is equipped with a fixing means, the axial position of the piston can be maintained at a fixed position relative to the cylinder, and the refrigerant can be compressed and discharged from the suction side to the discharge side, which is an excellent effect. Able to demonstrate

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the compressor of the present invention, and FIG.
The figure is a side view of the piston in Figure 1, Figure 3 is its front view,
Fig. 4 is a cross-sectional view of the cylinder in Fig. 1, Fig. 5 is a front sectional view thereof, Fig. 6 is a view taken along the line IV-IV in Fig. 1, and Fig. 7 is an axial view of the piston and cylinder. A cross-sectional view along FIG. 8 is a diagram showing a conventional compressor. In the figure, 1 is a sealed case, 2 is an electric part, 4 is a rotor, 6 is a spiral screw hole, 7 is a cylinder, 8 is a piston, 9 is a regulating means, and 31 is a flange member which is a fixing means.

Claims (1)

[Claims] An electric part provided in a sealed case, a cylinder provided along the axis of a rotor of the electric part and having a spiral threaded hole, and a spiral threaded piston fitted into the threaded hole of the cylinder. , a regulating means for regulating the rotation of the piston and allowing the piston to revolve around the axis of the rotor; and a regulating means for allowing the piston to slightly move in the axial direction and for controlling the discharge side of the threaded hole of the cylinder during the movement. A compressor comprising a fixing means for opening an open end.