JPH0435598Y2 - - Google Patents

Description

[Detailed explanation of the idea]

Industrial Application Field The present invention is provided with a plurality of vanes that can be freely retracted from the rotor, and the rotor is rotated with the vanes protruding into the compression chamber to obtain a compression effect. The present invention relates to a slide vane type rotary compressor, and more particularly to a mechanism for alleviating the start-up shock at startup by utilizing the effect of the vanes flying out toward the compression chamber due to the action of centrifugal force at startup. Conventional technology Generally speaking, in a slide vane type rotary compressor, compressed air is compressed in a space formed by a cylinder block formed in a hollow cylindrical shape and front and rear side plates that shield the front and rear ends of the cylinder block. A chamber is provided to allow the rotor to rotate freely,
In addition, a plurality of vanes are inserted into the rotor so as to be freely retractable in the radial direction, the vanes are pushed into the compression chamber, and the rotor is rotated with the tip of the vane in sliding contact with the inner wall surface of the cylinder block. The compression chamber is divided into a plurality of blocks by vanes, and each compression block is provided so as to obtain a compression action. The force that pushes the vanes toward the compression chamber at startup is the centrifugal force caused by the rotation of the rotor.After startup, in addition to that centrifugal force, the lubricating oil stored at the bottom of the separation chamber is A method is used in which the extrusion effect is obtained by feeding the material into a back pressure chamber formed at the bottom of the vane groove using the discharge pressure in the separation chamber, that is, by applying back pressure with lubricating oil in the separation chamber. There is. Problems that the invention aims to solve: However, when the compressor is started as described above, the vanes are pushed out by the action of centrifugal force, which causes a sudden load to be applied to the engine at the same time as the compression operation starts. Become. Therefore, when starting the compressor, the driver feels a sense of deceleration due to a sudden drop in engine output, which causes problems in that the driving feeling deteriorates and the compressor does not start up smoothly. That is, in the case of a compressor with a conventional structure, as shown in Fig. 3, each vane 8, 8, 8, 8 is made of the same material (iron, aluminum, etc.), has the same shape, and has the same weight. By being used, each vane 8, 8, 8, 8 will fly out at the same time at the time of startup, but by each vane flying out at the same time in this way, the entire compression chamber, that is, all of the The compression block instantaneously starts compressing and applies load torque to the engine, leading to a sudden drop in engine output, impairing the driving feeling of the vehicle, and causing the compressor to not start smoothly. This results in the following. Furthermore, if the engine speed is low when the compressor is started, sufficient centrifugal force cannot be obtained, and even if the rotor of the compressor rotates, the compressing action is not immediately performed. Means for Solving the Problems The present invention is an attempt to improve the above-mentioned problems by making each vane eject from the compression chamber at different rotational speeds. Therefore, the purpose is to alleviate the start-up shock at the time of start-up, and to allow the vanes to fly out smoothly even at a low rotation speed at the time of start-up. More specifically, at least one of the plurality of vanes that are fitted in and out of the rotor in a radial direction is provided with a high specific gravity member in order to obtain a larger weight than the other vanes. In other words, a weight difference is set between the vane and other vanes, and the same vane is ejected toward the compression chamber at a slightly earlier ejection timing than other vanes, so that all vanes are formed at once. By preventing the compression action from occurring in the compression block, the compressor is made to rise from slippage so as to reduce the engine load when starting the compressor. Function When the compressor starts at low speed rotation, the vanes formed by embedding high specific gravity members exert a large centrifugal force even at low rotation speeds, so that the vanes eject first when other vanes have not yet ejected. . That is, a compression action is obtained in some of the compression blocks, and discharge pressure is generated. This discharge pressure generates vane back pressure, and the centrifugal force and vane back pressure cause other vanes to fly out. This provides a smooth start of compression and eases the start-up shock. When starting at medium to high speeds, the centrifugal force necessary for ejection acts on all vanes, so all the vanes eject, but due to the slipping action of the clutch and belt, the slope is slightly reduced. Since the rotational speed increases over time, the vane formed by embedding the high specific gravity member has the effect of popping out at a slightly earlier timing than other vanes. Therefore, compression starts from the compression block formed by the vane that flew out early (vane with a high specific gravity member embedded), and the start of compression in the compression block formed by other vanes is delayed, so the engine and compression The load on the machine is distributed and the start-up shock is alleviated. Embodiments Specific embodiments of the present invention will be described below with reference to illustrative drawings. In each drawing shown in Figures 1 to 3, 1
is a housing that constitutes the outer shell of the compressor,
The housing 1 is formed by covering the opening of a rear housing 1R, which has an opening on the front side and is formed in a bottomed cylindrical shape, with a front housing 1F. An electromagnetic clutch 19 is rotatably supported on the front housing 1F via a cylindrical boss (not shown) located at the center of the front housing 1F. A cylinder block 2 is fitted into the rear housing 1R, and a front side plate 3F and a rear side plate 3R are fitted on both sides of the cylinder block 2 so as to sandwich the cylinder block 2 therebetween. The inside of the cylinder block 2 is formed into a hollow elliptic cylinder shape with openings at both the front and rear ends.
Both the front and rear openings are the above-mentioned side plates 3F,
3R, both side plates 3F,
A rotor shaft 4 is horizontally suspended between the 3Rs by penetrating the hollow portion. A cylindrical rotor 5 is mounted on the rotor shaft 4 in correspondence with the hollow part of the cylinder block 2. It is provided so as to be able to come into sliding contact with the diameter portion. By providing the rotor 5 in sliding contact with the short diameter portion of the inner wall surface in this manner, a pair of upper and lower compression chambers 6, 6 are formed between the outer peripheral surface of the rotor 5 and the outer peripheral surface of the rotor 5 on the long diameter side of the inner wall surface. be done. Further, a plurality of vane grooves 7, 7, 7, 7 are formed in the rotor 5 so as to extend in the radial direction so that the front and rear ends thereof are open to both the front and rear end surfaces of the rotor 5. And each vane groove 7, 7,
Vanes 8A, 8A, 8B, 8B are inserted into and retracted from the bottom of the groove 7 so as to form a back pressure chamber 7a between the lower ends and the bottom of the groove 7, respectively. The vanes 8A, 8A, 8B, and 8B are made of iron or aluminum and have the same shape and weight. Among the vanes 8A and 8B, vanes located in symmetrical positions, for example, 8A and 8A
A pair of punched holes 20, 20 formed in a circular shape are provided at approximately the center thereof so as to pass through both the front and back sides, and the punched holes 20,
20 has a weight 2 having the same volume as the punched hole 20.
1 and 21 are embedded. Note that the weights 21, 21 are formed using a material having a higher specific gravity than the material of the vane 8A, for example, lead. For example, if the vanes are made of Al and Fe,
Experiments show that the rotation speeds at which the centrifugal force necessary for the vanes to fly out are 1600 rpm and 924 rpm, respectively. If the centrifugal force required for the vane to fly out is F (academic unit in g), the mass of the vane is m, the peripheral speed of the rotor is V, and the radius of the rotor is r, then it is expressed by the formula F=m・V ² /r.

[Table] From the above experimental results, the centrifugal force F required for the vane to fly out can be approximately approximated by the value F=652g. Therefore, the idling speed, e.g. 800rpm
However, in order to make the vane fly out, the weight of the vane is approximately
32g (4 times the aluminum vane above, 4 times the weight of the Fe vane)
1.3 times). As calculated above, by making at least one vane heavier, it will pop out when the rotation speed reaches 800 rpm.
You can get a vane that pops out when the rpm reaches 1600 rpm (for Al vanes). On the other hand, a discharge chamber 9 is formed between the rear housing 1R by cutting out a part of the cylinder block 2 at the end of both compression chambers 6, and a discharge hole 10 is formed between the discharge chamber 9 and the end of the compression chamber 6. It is provided so that it communicates with the 11 is the same discharge hole 1
A discharge valve 12 covers the discharge valve 11, and a retainer 12 regulates the opening angle of the discharge valve 11. Further, a suction chamber 13 is formed between the front housing 1F and the front side plate 3F, and the suction chamber 13 includes a suction port 28 opening to the front side plate 3F, a suction passage 29 formed in the cylinder block 2,
It is provided so as to communicate with the starting end of the compression chamber 6 via the suction hole 14 . And also rear side plate 3
There is a lubricating oil separation chamber 1 between R and rear housing 1R.
5 is formed, and the separation chamber 15 is provided so as to communicate with both the discharge chambers 9 through a discharge passage 16 and a filter 17. A reservoir 18 is provided at the bottom of the separation chamber 15, and the reservoir 18 includes a passage 26 and an annular groove 2 carved in the rear side plate 3R.
5. The rear bearing chamber 23 and the rear side plate 3R are provided so as to communicate with each back pressure chamber 7a via a pressurizing groove 27R carved in an arc shape so as to face the rotation locus of the back pressure chamber 7a. . FIG. 4 is a drawing showing the second embodiment,
A weight 21 formed in a long plate shape is embedded in the vane 8A so as to extend in both left and right width directions. Further, FIG. 5 is a drawing showing a third embodiment, in which a pair of notches 22, 22 formed in a gate shape facing the bottom of the vane 8A penetrates between the front and back surfaces. The notches 22, 2 are provided as shown in FIG.
2, the same notch portions 22, 22 are made of lead as a material.
Weights 21, 21 formed in the same shape as are embedded. Next, its effect will be explained. When the driving force of the engine is transmitted to the rotor shaft 4 through the connecting operation of the electromagnetic clutch 19, the rotor 5 rotates and the compressor is started. At this time, the rotation speed of the compressor takes some time to rise due to clutch and belt slippage, so each vane 8
Some vanes 8 of A, 8A, 8B, 8B
Each vane 8A has a larger weight than the other vanes 8B and 8B.
A, 8A, 8B, and 8B have the effect of ejecting toward the compression chamber 6 when they reach their respective ejecting rotational speeds, that is, with a slight time difference. In other words, immediately after startup, the heavier vanes 8A, 8
A, that is, the vanes 8A, 8A that can obtain a large centrifugal force at low rotation speeds pop out, and the vanes 8A, 8A have the effect of compressing the refrigerant gas in the compression chamber 6 (50% operation as a whole). At the same time, as the discharge pressure increases, the other vanes 8B, 8B
The back pressure against the vanes 8A, 8A, and
A compression effect (100% operation as a whole) can be obtained by 8B and 8B. And like this Vane 8
Since A, 8A and vanes 8B, 8B fly out with a slight time difference, there is no instantaneous high load applied to the engine that would cause the engine speed to suddenly drop.
It is possible to smoothly start up the compressor without giving a feeling of deceleration (shock) due to a sudden drop in engine output. Also, in this way, at the same time as the compressor is started, the vanes 8A and 8A move into the compression chamber 6.
By flying out toward the refrigerant gas, the refrigerant gas can be compressed at the same time as the compressor is started. In addition, although the above embodiment describes a compressor having a plurality of compression chambers at 180 degrees phase position with a rotor in between, the number of compression chambers is not limited to the above embodiment. It is also possible to implement this method for a compressor equipped with a single compression chamber. Further, in the above embodiment, an even number of vanes is provided and the vanes with a large thickness are arranged in symmetrical positions, but an odd number of vanes is provided and the vanes with a large thickness are arranged in an asymmetrical position. It is also possible to do so. Furthermore, when the vanes with such large plate thickness are arranged asymmetrically, the mass of the vanes is extremely small compared to the rotor, so it is possible to operate the compressor without uneven rotation of the rotor. I can do it. Effects of the invention The present invention has a vane groove shape by forming at least one of the plurality of vanes that are inserted and inserted into the rotor so as to be freely retractable into the rotor to have a weight greater than that of the other vanes. , without making any modifications to the rotor shape, etc., the same vane can be launched toward the compression chamber slightly earlier than other vanes at startup, without causing shock to the compressor engine. I was able to start it up smoothly. Furthermore, in the present invention, due to the above-described configuration, even when the engine is idling and the rotation speed is low and a large centrifugal action cannot be obtained, a large centrifugal force is exerted on some of the vanes. By configuring it so that it acts, it is possible to obtain the effect of pushing the vane towards the compression chamber at the same time as the compressor is started, that is, the effect of compressing the refrigerant gas at the same time as the compressor is started. By operating, discharge pressure is applied to the back surface of the vane to promote the vane's ejection, achieving a smooth start-up. In addition, since the outer shape of the vane of the present invention can be exactly the same as the conventional one, there is no need to modify the vane groove, rotor, etc., and the present invention can be implemented simply by improving the vane, which is an undeniable advantage. also occurred.

[Brief explanation of the drawing]

1 to 3 are drawings showing a first embodiment, in which FIG. 1 is a sectional view of the main parts of a compressor according to the present invention, FIG. 2 is a side sectional view showing the entire compressor, and FIG. FIG. 3 is an enlarged perspective view of the vane. Figure 4 is the second
FIG. 5 is an enlarged perspective view of a vane representing the third embodiment. FIG. Further, FIG. 6 is a sectional view of a compressed portion showing a conventional structure. 1...Housing, 1F...Front housing, 1R...Rear housing, 2...Cylinder block, 3F...Front side plate, 3
R...Rear side plate, 4...Rotor shaft,
5... Rotor, 6... Compression chamber, 7... Vane groove, 7a... Back pressure chamber, 8A, 8B... Vane, 9
...Discharge chamber, 10...Discharge hole, 11...Discharge valve,
12...Retainer, 13...Suction chamber, 14...
Suction hole, 15... Separation chamber, 16... Passage, 17...
... Filter, 18 ... Reservoir, 19 ... Electromagnetic clutch, 20 ... Punching hole, 21 ... Weight,
22... Notch, 23... Rear bearing chamber,
25... annular groove, 26... passage, 27R... pressure groove.

Claims (1)

[Scope of utility model registration request] A cylinder block formed into a hollow cylindrical shape,
In the space formed by both side plates that shield both the front and rear openings of the cylinder block,
A rotor is provided with a compression chamber so as to be freely rotatable, and a plurality of vanes are fitted into the rotor so as to be retractable in the radial direction so as to be able to protrude toward the compression chamber. In a sliding vane rotary compressor, at least one of the plurality of vanes is formed by embedding a high specific gravity member inside the vane in order to obtain a larger weight than the other vanes. A rising shock mitigation mechanism in a slide vane rotary compressor that sets a weight difference between the vane and the vane.