WO2009015544A1

WO2009015544A1 - A sliding vane torsion spring for a rotary compressor and its application

Info

Publication number: WO2009015544A1
Application number: PCT/CN2008/000254
Authority: WO
Inventors: Zhenhua Chen; Zhengxiong Xiaojin; Ziqiang Liang; Chunxian Long; Qiang Gao
Original assignee: Guang Dong Mei Zhi Refrigeration Equipment Co., Ltd
Priority date: 2007-07-29
Filing date: 2008-01-31
Publication date: 2009-02-05
Also published as: CN101100998A; CN101100998B

Abstract

A sliding vane torsion spring for a rotary compressor includes an electric motor and a compression assembly which are disposed in a hermetic casing (19). The compression assembly comprises a piston (4) provided in a cylinder (3), an eccentric crankshaft (9) for driving the piston (4) to rotate, bearings (7, 8) for supporting the eccentric crankshaft (9), and a sliding vane (5) disposed in a sliding vane slot (10) of the cylinder. The sliding vane (5) is in contact with one or more torsion springs having a winding coil portion (6, 6') and two end portions (12, 12.1, 12.2, 13, 13”), one end portion (12, 12.1, 12.2) making contact with the sliding vane (5), the other end portion (13, 13”) abutting against a front wall (17) or a back wall (16) of the sliding vane slot (10). A support is disposed on the sliding vane (5), on which is provided an elongated hole, or on the sliding vane (5) is provided an elongated hole; and the torsion spring is formed with a hook head (18) on one end portion (12, 12.1, 12.2).

Description

Sliding torsion spring of rotary compressor and its application

The present invention relates to a rotary compressor, and more particularly to a slider torsion spring of a rotary compressor and an application thereof.

Background technique

Rotary compressor with more than 40 years of history, designed by improving efficiency, twin-cylinder and two-stage compression, new refrigerant and high-pressure refrigerant for C0 _2, and application of two-cylinder capacity control. It has indeed been developing, and the biggest design change points are: (1) In order to improve efficiency and cope with high-pressure refrigerant, the cylinder height becomes smaller year by year; (2) In order to cope with the two-stage compression and capacity control, the slide cavity must be closed. In this context, as shown in Figure 1, the use of the previous coil-type vane spring has the following problems: (A) The spring-fitted hole must be opened at the back of the vane cavity, which directly reduces the cylinder Rigid; (B) For the slide cavity that must be sealed, the spring assembly hole is very difficult to seal and the manufacturing cost is also high; (C) The spring design in the tensile direction is difficult.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a slider torsion spring of a rotary compressor having a simple and reasonable structure, high cylinder strength, low sealing cost, and wide application range, and an application thereof, to overcome the deficiencies in the prior art.

A sliding vane torsion spring of a rotary compressor designed according to the purpose, comprising a motor and a compression assembly disposed in the sealed casing, the compression assembly comprising a piston respectively disposed on the cylinder and an eccentric crankshaft driving the piston to rotate, supporting the eccentric crankshaft The bearing, the sliding piece disposed in the cylinder sliding cavity, is characterized in that the sliding piece is connected with one or more torsion springs, and each torsion spring comprises a coiled coil portion and two ends, one of which ends with The sliders are connected, and the torsion springs are arranged laterally or vertically.

One end of the torsion spring is hooked or crimped with the sliding piece, and the other end is crimped on the front wall or the rear wall of the sliding cavity; and/or the connecting portion of the torsion spring and the sliding piece is disposed at the center of the sliding piece in the up and down direction Above the line or centerline.

Confirmation The sliding piece is provided with a bracket, the bracket is provided with a strip hole, or the sliding piece is provided with a strip hole; and/or one end of the torsion spring is provided with a hook head.

The bearing comprises an upper bearing and a lower bearing, the upper bearing and/or the lower bearing are provided with a U-shaped or V-shaped opening, and/or the cylinder is provided with a U-shaped or V-shaped opening; the torsion spring The coil portion is disposed in the opening; and/or the torsion spring and the sliding portion are disposed above the center line or the center line of the slider in the up and down direction.

The cylinders are two, and a partition plate is disposed between the partitions, and a through hole is arranged in the partition plate, and a coil portion of the torsion spring is disposed in the through hole, and two ends of the torsion spring respectively and two of the two cylinders Connected, the cylinder is provided with a vertical hole for adjusting the pressure of the sliding vane cavity to the same pressure as the casing; and/or a through hole of the partition plate is provided with a pin shaft, and the coil portion of the torsion spring is sleeved on the pin shaft; There are two cylinders, and a partition plate is arranged between them. The upper cylinder and the lower cylinder are respectively provided with a torsion spring, one end of the torsion spring is connected with the sliding piece, the other end is connected with the sliding piece cavity, the cylinder sliding piece cavity and the pressure are switched. The tubes are connected to each other, and/or a pressure balance hole is disposed on the sliding chamber;

Or two cylinders, the torsion spring is disposed on one of the cylinders, one end of which is in contact with the sliding piece; and/or the connecting portion of the torsion spring and the sliding piece is disposed above the center line or the center line of the sliding piece in the up and down direction.

The application of the torsion spring of a rotary compressor designed for this purpose is characterized in that one end of the torsion spring is mounted on the sliding piece, the sliding piece is pushed toward the piston, or the sliding piece is pulled away from the side of the piston.

The other end of the torsion spring is mounted on a cylinder, a bearing or a spacer, or by fixing a coil portion of the torsion spring to generate an elastic force to the slider.

The torsion spring is installed in the sliding cavity, and the width of the sliding cavity is W1 and the width W2 of the torsion spring is to prevent the torsion spring from moving in the left-right direction.

The torsion spring may be installed in a single cylinder or in a double cylinder or multiple cylinders, wherein the pressure of the sliding chamber in the double cylinder may be the same or different.

The torsion spring in one of the two cylinders acts on the compression direction, and the torsion spring in the other cylinder acts on the stretching direction.

Normally, the vane spring acts as a compression magazine, which acts to press the front end of the slider The outer circumference of the piston, so that the cylinder can be compressed as soon as the compressor is started. When the compressor starts to compress the cylinder, the pressure on the back of the slider (and the vane chamber) becomes the high pressure side.

Since the pressure of the cylinder compression chamber changes back and forth between the low pressure side and the high pressure side, the pressure at the back of the vane is higher than the pressure in the cylinder compression chamber. Therefore, the vane can follow the piston even without the vane spring, and the compressor can continue to compress. Therefore, the vane spring is only the part that is required when the rotary compressor is started. Further, according to the spring constant of the slider, the force in the compression direction of the slider is only 10% or less with respect to the force in the compression direction due to the pressure difference. Therefore, in the two cylinders of the two-cylinder rotary compressor, as long as one has a vane spring, and in the other cylinder, even if there is no vane spring, the twin cylinders can start to compress.

The invention has the advantages of simple and reasonable structure, low production cost and wide application range, and can be applied to the case of a sliding cavity seal, such as a capacity control compressor, a two-stage compression or a low-pressure shell type compressor; and can also be applied to a cylinder with a low height. , such as C0 ₂ rotary compressor, high pressure compressor such as R410A or high efficiency compressor; can also be applied to the sliding spring in the direction of stretching, such as capacity control compressor or two cylinder rotary compressor.

DRAWINGS

FIG. 1 is a schematic structural view of an embodiment of the prior art.

2 to 3 are schematic views showing the structure of the slider in a state of being stretched and compressed, respectively, in the first embodiment of the present invention.

Figure 4 is a schematic cross-sectional view of the Y-Y of Figure 2;

Fig. 5 is a front enlarged structural view of the first torsion spring.

Figure 6 is a top plan view of Figure 5.

Figure 7 is a schematic view showing the structure of a second embodiment of the present invention.

Figure 8 is a schematic view of the X-direction structure of Figure 7.

Figure 9 is a schematic enlarged view of the second torsion spring.

Figure 10 is a schematic right side view of Figure 9.

Figure 11 is a schematic view showing the structure of a third embodiment of the present invention. Figure 12 is a schematic enlarged view of the third torsion spring.

Figure 13 is a schematic right side view of Figure 12;

Figure 14 is a top plan view of Figure 11.

Figure 15 is a schematic enlarged view of the slider.

Figure 16 is a schematic view showing the structure of a fourth embodiment of the present invention.

17 to 18 are enlarged schematic views of the fourth torsion spring.

19 is a structural schematic view showing the pin shaft of the fourth torsion spring.

Figure 22 is a schematic view showing the structure of a fifth embodiment of the present invention.

Figure 23 is a schematic view showing the structure of a sixth embodiment of the present invention.

Figure 24 is a cross-sectional view showing the structure of the Z-Z of Figure 23;

detailed description

The invention is further described below in conjunction with the drawings and embodiments.

In the figure: 3 is the cylinder, 4 is the piston, 5 is the sliding piece, 6 is the coil part of the first torsion spring, 6' is the coil part of the 2nd torsion spring, 7 is the upper bearing, 8 is the lower bearing, 9 is eccentric The crankshaft, 10 is the sliding cavity, 12 is the operating end of the first torsion spring, 12.1 and 12.2 are the operating ends of the fourth torsion spring, 13 is the fixed end of the first torsion spring, and 13 is the fixing of the third torsion spring. End, 14 is an opening, 15 is a bracket, 16 is a sliding chamber rear wall, 17 is a sliding chamber front wall, 18 is a hook head, 19 is a compressor housing, 21 is a partition, 22 is a through hole, 23 It is a vertical hole, 31 is a pin shaft, 33 is a pressure balance hole, 41 is an upper cylinder, 42 is a pressure switching tube, 43 is a lower cylinder, Θ is an angle of the first torsion spring, and θ ' is a second torsion spring The included angle and θ〃 are the angles of the third twist.

First embodiment

Referring to Figures 2–3, a sealed rotary compressor housing houses a motor and compression assembly. The compression assembly consists of a cylinder 3, a piston 4, a vane 5, a first torsion spring and upper and lower bearings 8 and 8 which seal these components, and an eccentric crankshaft 9 supported by two bearings. In addition, use a screw (not shown) to connect the cylinder to the upper and lower bearings.

The first torsion spring is received in the slider cavity 10 disposed on the back of the slider, as shown in FIG. 4-6, the first twist The spring is composed of two twisted turns, including two coil portions 6, a common action end 12 in the middle and two fixed ends 13 on the side, and the coil portion 6 of the first torsion spring is received in the U-shaped opening 14 of the lower bearing 8. The front end of the action end 12 is mounted in a strip-shaped hole in the bracket 15 in which the rear end of the slider 5 is processed. The two fixed ends of the side of the coil portion are mounted on the rear wall 16 of the slider chamber 10, and a V-shaped or U-shaped portion is formed between the fixed end and the action end, and on the one hand, the spring end is generated at the action end, and on the other hand, the fixed end is It is fixed to the rear wall of the sliding vane cavity by the reaction force. Further, the width W1 of the slider chamber 10 in Fig. 4 is smaller than or equal to the first torsion spring width W2 in Fig. 6, so that the first torsion spring accommodated in the slider chamber is prevented from moving in the left-right direction. '

The sliding piece reciprocates in the horizontal direction. At the same time, the sliding piece joint portion of the operating end 12 performs an approximate circular motion centering on the intersection of the extending end of the operating end and the fixed end. When the first torsion spring performs the telescopic movement, the coil portion and The fixed end will perform a small amount of up and down movement. Therefore, the inner diameter of the U-shaped opening 14 is designed to be slightly larger than the outer diameter of the coil portion, so that the gap has a gap, so that the first torsion spring can freely expand and contract, the slide spring Local stress does not occur inside.

When the angle 动作 between the action end and the fixed end is greater than the maximum angle when installed in the compressor, the slide will act on the first torsion spring in compression, since the front end of the slide is in contact with the outer circumference of the piston, Gas compression begins at the same time as the compressor is started.

During the operation of the compressor, the first torsion spring expands and contracts with the reciprocating motion of the slider. Figure 2 shows the state of the maximum stroke of the slider, that is, the length of the slider entering the inside of the cylinder is the longest, Figure 3 is The state in which the slide stroke is the smallest. The first torsion spring is stretched and contracted as shown in Figs. 2 and 3.

Second embodiment

Referring to Figures 7-10, the functions of the second torsion spring and the first torsion spring are substantially the same, but the second torsion spring only includes a torsion spring, the coil portion is disposed in the middle, and the side portions of the coil portion are the action end and the fixed end, respectively.

The remaining parts are not described in the first embodiment and will not be repeated.

Both the first torsion spring and the second torsion spring act on the compression aspect of the slider.

Third embodiment

Referring to Figures 11-15, the third torsion spring can apply spring force to the direction in which the slider is stretched, Figure 12 The angle θ of the third torsion spring shown in the figure is large in the minimum state of the slider stroke, so that the slider can be applied to the stretching direction, but the fixed end 13〃 must be mounted on the front wall 17 of the slider chamber 10. In Fig. 15, the slider holder 15 is provided with a strip-shaped oblong hole. When the third torsion spring is being expanded and contracted, the hook 18 of the action end slides up and down in the oblong hole, and the third torsion spring can be freely stretched. . Therefore, in this design, it is not necessary to design the inner diameter of the U-shaped opening 14 to be larger than the outer diameter of the coil portion. Moreover, the action point of the sliding end of the sliding piece is above the center line or the center line of the upper and lower positions of the sliding piece, the same below, not only in the stretching direction, but also in the compression direction, the action point of the moving end relative to the sliding piece is also increased. The radius of the circular motion, as for the reason why the third torsion spring is required to be stretched, will be further explained later. The remaining parts are not described in the first embodiment and will not be repeated.

Fourth embodiment

Referring to Figures 16-20, the application method of the torsion spring on the two-cylinder rotary compressor will be described. In the case of a rotary compressor, there must be a partition 21 between the two cylinders. The coil portion of the torsion spring is housed in the rectangular through hole 22 provided in the partition plate 21. The two ends of the fourth torsion spring are respectively connected to the two sliding pieces of the two cylinders, and thus the two end portions become two The independent end points 12.1 and 12.2, the rectangular through hole is slightly larger than the outer diameter of the coil portion, and even if the fourth torsion spring is slightly shifted up and down due to the expansion and contraction of the operating end, the movement is smooth.

The vertical hole 23 provided in the lower bearing 8 adjusts the pressure of the vane chamber 10 to the same pressure as the casing (usually the high pressure side), which is equivalent to the pressure balance hole, but this structure cannot be applied to the low back pressure of the casing. In the case of a rotary compressor, or in the case of capacity control or the like, since both types are sealed by the vane chamber, the pressure balance hole cannot be used.

In actual use, a pin shaft 31 may be disposed in the through hole, and the coil portion of the fourth torsion spring is sleeved on the pin shaft and disposed in the rectangular through hole of the partition plate 21, due to the outer diameter of the pin shaft and the inner diameter of the coil portion A small gap is reserved between them, so that the coil portion can be freely rotated, but limited by the pin 31, so that only a small amount of movement can be performed in the up and down direction. The remaining parts are not described in the first embodiment and will not be repeated.

Fifth embodiment

Referring to Figure 22, this structure is a device that can completely seal the sliding cavity and control the refrigeration capacity of the compressor. An application example of a two-cylinder rotary compressor with capacity control function, a variable-capacity rotary compressor can normally switch the pressure of the vane chamber freely on the high-pressure side and the low-pressure side, and stop the slide and release the stop motion. . In the present embodiment, the second torsion spring in the compression direction is employed in the upper cylinder 41, and the third torsion spring in the extension direction is employed in the lower cylinder 43. The lower cylinder 43 seals the vane chamber and connects the pressure switching pipe 42. If the upper cylinder maintains the same high pressure as the casing pressure, the pressure equalizing hole 33 must be opened. The remaining parts are not described in the first embodiment and will not be repeated.

Sixth embodiment

See Figure 23 - Figure 24 for a design example of the horizontal arrangement of the torsion spring. This makes it easy to understand the technical features provided in this paper, that is, the torsion spring is not only placed in the vertical direction, but also in the horizontal direction. The remaining parts are not described in the first embodiment and will not be repeated.

The contents are summarized as follows, as shown in Fig. 5-6, Fig. 9-10, Fig. 12-13, Fig. 17-20, all kinds of torsion springs are composed of action end, fixed end and coil part, action A V-shaped or U-shaped shape is formed between the end and the fixed end, so that a spring force can be generated. The coil portion can increase the overall length of the spring due to its small size, and reduces the spring coefficient and spring stress, which can improve the reliability of the spring while reducing the starting torque of the compressor. Further, the action end in Figs. 5 to 6 is provided at the center of the torsion spring, and the end portion on the outer side of the coil portion serves as a fixed end. Further, even if the end portion of the fixed coil or a part of the coil portion has the same function as the fixed end, the meaning of the fixed end cannot be narrowly understood.

In order to allow the torsion spring to apply the initial compressive force or tensile force to the sliding piece, a V-shaped or U-shaped angle θ is designed as a torsion spring unit, and its function is as follows: (1) In the application of the compression direction, it is usually slippery. The piece is pushed in the direction of the piston, (2) when applied in the direction of stretching, the blade is usually pulled away from the direction of the piston.

In Fig. 2, as the reciprocating movement of the slider, the torsion spring performs the telescopic movement, and the coil portion also performs a small range of up and down movement in conjunction with the telescopic movement. However, if the inner diameter of the U-shaped opening 14 is set to be slightly larger than the outer diameter of the coil portion and there is a certain gap, excessive stress is not generated on the vane spring.

Figure 7 is a more simplified design of the torsion spring with the effect of reducing the vane cavity.

Fig. 11 shows the design of the torsion spring applied in the stretching direction, and recently completed the study of stopping the sliding of a two-cylinder compressor for controlling the refrigeration capacity of the compressor. In this technology, it will take a short time The vane cavity becomes the low pressure side, separating the vane from the piston, and also requires a torsion spring in the tensile direction.

In Fig. 15, the slider holder 15 is provided with an oblong hole, so that the hook head 18 of the action end and the torsion spring are synchronized, and can be moved up and down in the holder. In addition, the action end of the torsion spring acts above the center line of the slider, so that the distance between the action point of the action end and the center of the coil becomes longer, and the radius of the circular motion of the action end becomes larger, so that the activity of the torsion spring is smooth, and the reliability thereof Can also be improved.

Fig. 16 is a design example in the case where the two vane chamber pressures in the two-cylinder rotary compressor are generally the same. In this design, the torsion spring does not substantially change the angle Θ between the operating ends with respect to the two sliding pieces, and the sliding piece is pressed in the compression direction while maintaining the initial compressive force, and the up and down movement of the coil portion can also be changed. Small, so it is an ideal application example.

In addition, the hook heads 18 of the two operating ends are designed to press against a portion of the back of the slider, and the hook head does not interfere with the advantage of the cylinder slider slot even if the slider stroke is increased into the slider slot. As such, the design of the hook head mounted on the slider has a variety of application examples and cannot be understood simply and narrowly.

Fig. 21 is a design in which a pin shaft is used in order to freely slide the coil portion up and down and further improve reliability. In this case, the up and down movement of the coil is limited by the sliding axis, and the upper and lower movements can be more accurately performed, thereby further improving the reliability of the slider spring. In addition, such a sliding shaft can be applied to all of the design examples of this time.

As shown in Fig. 22, if the pressure of the pressure switching pipe 42 is the high pressure side, the slider of the upper cylinder starts to work, but if it is switched to the low pressure side, the slider cavity is also switched to the low pressure side, and the slider is pulled by the torsion spring. Live and be stored in the slide cavity, so it doesn't work. In this way, the torsion spring in the tension direction can control the compression operation (ON/OFF) of the cylinder, so it can be used in the capacity control of the compressor.

Figures 23 to 24 show an example in which the torsion springs are arranged horizontally, that is, the torsion springs are not only arranged in the vertical direction but also in the horizontal direction.

Claims

Claim

A slider torsion spring for a rotary compressor, comprising: a motor and a compression assembly disposed in a sealed housing, the compression assembly including a piston respectively disposed on the cylinder and an eccentric crankshaft driving the piston to rotate, and a bearing supporting the eccentric crankshaft, a sliding piece disposed in the cylinder slide cavity, characterized in that the sliding piece is connected with one or more torsion springs, each of the torsion springs comprises a crimped wire crotch portion and two end portions, one of which ends with the sliding piece Connect, the torsion spring is set horizontally or vertically.

2 . The slider torsion spring of a rotary compressor according to claim 1 , wherein one end of the torsion spring is hooked or crimped to the sliding piece, and the other end is crimped to the front wall or the rear wall of the sliding cavity. The upper portion and/or the torsion spring and the slider are disposed above the center line or the center line of the slider in the up and down direction.

3. The slider torsion spring of the rotary compressor according to claim 2, wherein the slider is provided with a bracket, the bracket is provided with a strip hole, or the slider is provided with a strip hole; / or a hook on one end of the torsion spring.

4. The slider torsion spring of a rotary compressor according to claim 1, wherein said bearing comprises an upper bearing and a lower bearing, and said upper bearing and/or lower bearing are provided in a U-shape or a V-shape. Openings, and/or cylinders are provided with U-shaped or V-shaped openings; the coil portion of the torsion spring is disposed in the opening; and/or the torsion spring and the sliding portion are disposed on the sliding plate in the up and down direction Above the centerline or centerline.

The slider torsion spring of a rotary compressor according to claim 1, wherein said cylinders are two, and a partition plate is disposed therebetween, and a through hole is provided in the partition plate, and a coil portion of the torsion spring is provided. Provided in the through hole, the two ends of the torsion spring are respectively connected with two sliding pieces of the two cylinders, and the cylinder is provided with a vertical hole for adjusting the pressure of the sliding piece cavity to be pressed with the casing; and/or a pin shaft is provided in the through hole of the plate, and the coil portion of the torsion spring is provided Set on the pin;

There are two cylinders, and a partition plate is arranged between them. The upper cylinder and the lower cylinder are respectively provided with a torsion spring, one end of the torsion spring is connected with the sliding piece, the other end is connected with the sliding piece cavity, the cylinder sliding piece cavity and the pressure are switched. The tubes are connected to each other, and/or a pressure balance hole is disposed on the sliding chamber;

Or two cylinders, the torsion spring is disposed on one of the cylinders, one end of which is in contact with the sliding piece; and/or the contact portion of the torsion spring and the sliding piece is disposed above the center line or the center line of the sliding piece in the up and down direction.

6. The use of a slider torsion spring for a rotary compressor according to claim 1, wherein one end of the torsion spring is mounted on the slider, the slider is pushed toward the piston, or the slider is oriented from the piston Pull sideways.

7. The use of a slider torsion spring for a rotary compressor according to claim 6, wherein the other end of the torsion spring is mounted on a cylinder, a bearing or a spacer, or by fixing a coil portion of the torsion spring. , and the elastic force is generated on the slider.

8. The use of a slider torsion spring of a rotary compressor according to claim 6, wherein said torsion spring is mounted in a slider chamber, and a width W1 of the slider chamber < a width W2 of the torsion spring is Prevent the torsion spring from moving in the left and right direction.

The application of the torsion spring of the rotary compressor of the rotary compressor according to claim 6, wherein the torsion spring can be installed in a single cylinder or in a double cylinder or a plurality of cylinders, wherein The pressure of the vane chamber in the two cylinders may be the same or different.

10. The use of a vane torsion spring of a rotary compressor according to claim 9, wherein a torsion spring in one of said two cylinders acts in a compression direction, and a torsion spring acts in the other cylinder. In the direction of stretching.