JP4011227B2 - Gas compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary type gas compressor used in a car air conditioner and the like, and more particularly, to a gas compressor that suppresses fluctuations in compression torque generated during operation of the gas compressor.
[0002]
[Prior art]
The rotary type gas compressor includes a vane type and a scroll type, and any type of rotary type gas compressor causes a cyclic compression torque fluctuation during one rotation of the rotor shaft that compresses the gas. For example, in the gas compressor shown in FIG. 1 and FIG. 2 in which the vanes 2 on the rotor 16 side are five and the discharge valves 3 and 3 are symmetrically disposed at two locations of the cylinder chamber 4, the cylinder chamber 4 When the compression chamber 5 surrounded by two adjacent vanes in the inside communicates with the suction chamber 6 and passes through a cylinder inlet hole (not shown) opened in the cylinder chamber 4, the volume of the compression chamber 5 increases. Accordingly, the refrigerant gas is sucked from the suction chamber 6, and the refrigerant gas confined in the compression chamber 5 is compressed along with the rotation of the rotor shaft 1, and when passing through the discharge valve 3, the discharge chamber 8 of the discharge valve 3. The refrigerant gas compressed by opening the discharge valve 3 due to a pressure difference between the cylinder chamber 4 and the compression chamber 5 is sent to the discharge chamber 8. The suction / compression / discharge cycle is 5 times during one rotation of the rotor shaft, and 5 times on the other discharge valve 3 side, and the phase is shifted by 1/2 cycle on the other discharge valve 3 side. 10 times in total.
[0003]
Then, with this cycle as one cycle, fluctuations in the compression torque of the compressor occur as shown in FIG. That is, in the case of the five-vane two-discharge valve shown in FIG. 2, the compression torque fluctuation is periodically generated 10 times during one rotation of the rotor shaft.
[0004]
[Problems to be solved by the invention]
When the gas compressor is mounted in an engine room of an automobile, the rotor shaft 1 rotates by receiving rotational power from the engine shaft (crankshaft) of the automobile. That is, the rotational power is transmitted to the pulley 10 of the gas compressor from the pulley attached to the engine shaft (not shown) through the belt 9 in FIG. It is transmitted to axis 1. Therefore, the rotational speed of the rotor shaft 1 increases or decreases in proportion to the engine speed (rotational speed).
[0005]
The gas compressor is attached to the chassis of the automobile body with bolts or the like at the attachment portions 12a, 12a,.
[0006]
The compression torque fluctuation during the operation of the gas compressor is transmitted to the outside of the gas compressor as a mechanical vibration force via the attachment portion 12a and the belt 9, and vibrates a steering, a piping system, and the like that easily vibrate. While driving, the engine noise and driving noise are not bothering you much, but especially when the air compressor is running and the air compressor is running during quiet idling, the rotation of the gas compressor at that time If the vibration due to the fluctuation of the compression torque in the speed is close to the resonance frequency of the steering system, the piping system, etc., the vibration described above becomes an abnormal noise, which is very worrisome. Therefore, the generation of the abnormal noise must be prevented.
[0007]
Accordingly, the present invention provides a gas compressor in which fluctuations in compression torque are suppressed by increasing the moment of inertia of a rotating portion such as a rotor, rotor shaft, and pulley of the gas compressor.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 is a gas compressor that compresses gas by rotating a rotating part including a rotor, a rotor shaft, and a pulley fixed to the rotor shaft. The pulley is set to have a diameter larger than that of the rotor, and the pulley is provided with an inertia moment adding portion for increasing the inertia moment. The inertia moment adding portion does not have a larger diameter than the pulley. It is extended from an outer peripheral part and is provided between the pulley outer peripheral part and the case body which covers a gas compressor main body, It is characterized by the above-mentioned.
[0011]
In the first aspect of the present invention, since the inertia moment adding portion is provided in the pulley having a large diameter in the rotating portion, the inertia moment adding portion having a large inertia moment with respect to the mass is obtained, and the inertia moment is reduced with a small increase in the weight of the gas compressor. Increases efficiently.
[0018]
The “moment of inertia addition part” in the present invention is not an essential part for performing the functions as a compressor product (gas compression function, transmission function to the rotor, sealing function with the outside, etc.). The part for increasing the moment. However, even if it is a function performing part as the above-mentioned product, if it is replaced with a material having a high density only in order to increase the moment of inertia, for example, this material replacement part is an “inertia moment addition part”. is there. In addition, the “inertia moment adding portion” may also serve as, for example, a mounting portion for a jig or a weight balancing portion for rotational balancing used in a manufacturing process, a distribution process, or the like.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0020]
FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG.
[0021]
The gas compressor is attached to the chassis of the automobile body by bolts or the like at the attachment portions 12a, 12a,. Further, the refrigerant gas to be compressed is sucked from the suction pipe 13 connected to the gas compressor and discharged from the discharge pipe 21.
[0022]
The rotational power of the rotating part of the gas compressor is transmitted to the pulley 10 by a belt 9 wound between a pulley attached to the engine shaft of the automobile and a pulley 10 attached to the rotor shaft 1 of the gas compressor. Is done. The pulley 10 is rotatably held on the front side block 14 via a bearing 22. When the electromagnetic clutch 11 attached to the pulley 10 is engaged, the friction plate 22 of the electromagnetic clutch 11 and the pulley 10 are coupled, and the pulley 10 is fixed to the rotor shaft 1. Is transmitted to. That is, when the electromagnetic clutch 11 is ON, the operating state of the gas compressor is OFF, and when the electromagnetic clutch 11 is OFF, it is in a stopped state. When the electromagnetic clutch 11 is stopped, only the main body of the pulley 10 and the electromagnetic clutch 11 is the belt. 9 is idle.
[0023]
Next, according to FIG. 1 and FIG. 2, the gas compressor in which the discharge valves are arranged symmetrically in two places in the cylinder chamber with five vanes is generated 10 times during one rotation of the rotor shaft. The torque fluctuation will be described in detail.
[0024]
In the gas compressor shown in FIG. 1, the refrigerant gas that has circulated through the refrigerant circulation system of the air conditioner flows from the suction pipe 13 of the refrigerant circulation system to the check valve 6a of the suction port of the gas compressor by the operation of the gas compressor. Through the cylinder chamber inlet holes (not shown) provided in the front side block 14 and the rear side block 15, respectively, and then the rotor as indicated by an arrow A (see FIG. 2). 16, the cylinder 17, and the two vanes 2 and 2, and are sucked into the compression chamber 5 whose volume gradually increases.
[0025]
The five vanes 2, 2,... Are slidably inserted into five vane grooves that are evenly arranged on the rotor 16, and are always elliptical of the cylinder 17 during operation of the gas compressor. It comes in contact with the inner wall of the shape. Since this operating principle is well known and is not directly related to the present invention, a detailed description is omitted here.
[0026]
As the rotor 16 rotates, the compression chamber 5 is blocked by the above-described cylinder chamber inlet hole and the vane 2 on the rear side of the compression chamber 5 (opposite to the rotation direction of the rotor 16 (arrow B)), and is closed from the outside. The volume of the compressed chamber 5 is reduced, and the trapped refrigerant gas is compressed. Next, when the vane 2 on the front side of the compression chamber 5 (rotation direction (arrow B) side of the rotor 16) passes through the opening of the cylinder outlet hole 18, the compressed gas pressure in the compression chamber 5 is applied to the discharge chamber 8. Since it is higher than the gas pressure of the discharge chamber front chamber 19 to be communicated, the discharge valve 3 is opened and the compressed gas flows into the discharge chamber front chamber 19.
[0027]
The compressed gas separates the lubricating oil mixed in the refrigerant gas from the front chamber 19 of the discharge chamber by the oil separator 20, enters the discharge chamber 8, and is further sent to the discharge pipe 21 to circulate in the refrigerant circulation system. Return to the suction pipe 13.
[0028]
During the above-described suction / compression / discharge cycle, fluctuations in the compression torque occur in the rotating parts such as the rotor shaft 1, the rotor 16, the pulley 10, and the electromagnetic clutch 11. Since the belt 9 having low rigidity is interposed between the pulley 10 and the engine shaft side, the fluctuation in the compression torque is not absorbed and suppressed on the engine shaft side, and mechanical vibration (rotational fluctuation) is achieved. Will be invited.
[0029]
In this embodiment, a pair of cylinder inlet holes / cylinder outlet holes arranged symmetrically with an odd number of vanes provides a 180 ° phase difference between the suction / compression / discharge cycles of both cylinder inlet holes / cylinder outlet holes. The compression torque fluctuations are leveled, but the compression torque fluctuations are still unavoidable, and as shown by the broken line in FIG. 6, the number of vanes per rotation (360 °) of the rotating part is twice. There are compression torque fluctuations of 10 cycles.
[0030]
An embodiment of the present invention that suppresses the above-described fluctuations in compression torque will be described below with reference to FIGS.
[0031]
3 to 5 are sectional views showing the pulleys according to the embodiment of the present invention.
[0032]
The pulley 10 of FIG. 3 has an annular inertia moment adding portion 24 extending from the outer peripheral portion of the pulley 10 between the outer peripheral portion of the pulley 10 and the case body 12 covering the gas compressor body. In the embodiment, the inertia moment adding portion 24 is formed integrally with the pulley 10. Due to the inertia moment adding portion 24, the inertia moment of the pulley 10 is increased by 0.27 × 10 ⁻³ kgm ² to 1.2 times the inertia moment of 1.65 × 10 ⁻³ kgm ² . Thus, if the inertia moment addition part 24 is provided between the pulley 10 and the case body 12, the inertial moment of the rotating part increases without increasing the size of the gas compressor. In addition, if the inertia moment addition part 24 is made into an annular shape with a large diameter, the inertia moment / weight can be increased efficiently, and the balance during rotation is not easily lost, and the manufacture is easy.
[0033]
When the pulley 10 of FIG. 3 is used in a gas compressor, the fluctuation in compression torque is reduced as shown by the solid line in FIG. 6, and when the gas compressor is mounted on an automobile and operated, the product 1 of the invention 1 in FIG. Thus, the noise during idling was 8 dB lower than the conventional product.
[0034]
In the pulley 10 of FIG. 4, the annular inertia moment adding portion 24 has a larger diameter than the belt engaging portion 10 a of the pulley 10. In this embodiment, the annular inertia moment adding portion 24 is formed integrally with the pulley 10. Due to the inertia moment adding portion 24, the inertia moment of the pulley 10 is increased by 0.52 × 10 ⁻³ kgm ² , and becomes an inertia moment of 1.90 × 10 ⁻³ kgm ² , which is 1.4 times. If the inertia moment adding portion 24 has a larger diameter than the belt engaging portion 10a in this way, the distance between the inertia moment adding portion and the rotation center axis C of the rotating portion increases, so that the mass increase of the rotating portion is small. The moment of inertia increases.
[0035]
When the pulley 10 of FIG. 4 is used for a gas compressor, the fluctuation of the compression torque is reduced to the solid line or more of FIG. 6, and when the gas compressor is mounted on an automobile and operated, the product 2 of FIG. In addition, the idling noise was 11 dB lower than the conventional product.
[0036]
The pulley 10 in FIG. 5 has an annular inertia moment adding portion 24 larger in diameter than the belt engaging portion 10a of the pulley 10 and compensates for an increase in the weight of the pulley 10. Annular recesses 10b and 10b are provided from the medium diameter part to the small diameter part. In this embodiment, the annular inertia moment adding portion 24 is formed integrally with the pulley 10. Compared to the pulley of FIG. 4, the weight increase was small and the moment of inertia increased to the same extent. If the concave portion 10b is formed in an annular shape, the balance at the time of rotation is not easily lost, and the manufacture is easy.
[0037]
When the pulley 10 of FIG. 5 is used in a gas compressor, the fluctuation in compression torque is reduced to substantially the same level as that of the pulley of FIG. 4. When this gas compressor is mounted on an automobile and operated, noise during idling is generated. It dropped at almost the same level as the pulley in FIG.
[0038]
Among the rotating parts of the gas compressor, the pulley 10 has a large diameter, and the room for changing the dimensions is relatively large. If the inertia moment adding portion 24 is provided at a position away from the rotation center axis C of the pulley 10 as in the above-described embodiment, an inertia moment adding portion having a large inertia moment with respect to the mass is obtained, and the weight of the gas compressor is increased. And the moment of inertia increases efficiently.
[0039]
In addition, these inertia moment addition parts 24 provided in the pulley 10 can also be used in a manufacturing process, a distribution process, or the like, for example, as an attachment part to a jig or as a weight balancing part for rotational balancing.
[0040]
In the above-described embodiment, the inertia moment adding portion 24 is integrally formed with the pulley 10. However, the main body portion of the pulley 10 is made of iron as in the conventional product, and the inertia moment adding portion 24 is made of lead, copper alloy, heavy metal. If a material having a higher density than iron is used, the moment of inertia can be further increased. In this case, the inertia moment adding portion 24 is fixed to the pulley 10 by a technique such as brazing, bonding, welding, screwing or the like. Further, in order to prevent an accidental dropout during rotation and to prevent loss of balance, a concave ring portion is provided on the inner diameter side of the pulley 10 as shown by a broken line d in FIGS. It is preferable to adopt a structure in which a convex ring portion provided on the inner diameter side of the inertia moment adding portion 24 is fitted.
[0041]
The inertia moment adding portion in the present invention may be provided in another portion of the rotating portion. For example, by using a material with a large mass such as lead, copper alloy, heavy metal, etc. as the material near the outer diameter of the rotor, the original functional parts of the rotor (vane groove surface, joint surface with the rotor shaft, sliding contact with the side block) The surface or the like) may be made of another suitable material by covering, or a material having a large mass may be attached to the friction plate of the electromagnetic clutch.
[0042]
【The invention's effect】
As described in detail above, according to the present invention, since the inertia moment adding portion is provided in the rotation portion of the rotor, rotor shaft, pulley, etc. of the gas compressor, the inertia moment of the rotation portion is increased and the compression torque fluctuation is suppressed. In addition, it is possible to prevent the occurrence of abnormal sounds such as steering and piping systems.
[0043]
If the inertia moment addition part is provided on a pulley with a large diameter among the rotating parts, it becomes an inertia moment addition part with a large inertia moment for the mass, and the weight increase of the gas compressor due to the provision of the inertia moment addition part is small. Tesumu.
[0044]
In addition, if the inertia moment adding portion provided on the pulley is extended from the pulley outer periphery between the pulley outer periphery and the case body covering the gas compressor main body, the inertia moment adding portion can be provided even if the inertia moment adding portion is provided. The moment of inertia can be increased without increasing the size.
[0045]
Furthermore, if the inertia moment addition portion provided on the pulley is made larger in diameter than the belt engagement portion, the distance between the inertia moment addition portion and the rotation center axis of the rotation portion is large, so the mass increase of the rotation portion is small. On the other hand, the moment of inertia can be increased.
[0046]
In addition, when the pulley is provided with an inertia moment adding portion and a recess is provided in the middle diameter portion or small diameter portion of the pulley closer to the rotation center axis of the rotating portion than the inertia moment adding portion, the increase in mass due to the inertia moment adding portion is reduced. Even if compensation is provided by a decrease in mass due to the above and an inertia moment adding portion is provided, an increase in the weight of the pulley can be suppressed.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view showing a main part of FIG. 1;
FIG. 4 is a cross-sectional view showing a main part of another embodiment of the present invention.
FIG. 5 is a sectional view showing a main part of still another embodiment of the present invention.
FIG. 6 is an explanatory diagram showing fluctuations in the compression torque of the gas compressor.
FIG. 7 is an explanatory diagram showing the relationship between the moment of inertia of the rotating part of the gas compressor and the noise level.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor shaft 2 Vane 4 Cylinder chamber 5 Compression chamber 9 Belt 10 Pulley 10a Belt engaging part 10b Recess 12 Case body 12a Attachment part 16 Rotor 17 Cylinder 24 Inertia moment addition part 25 Gas compressor main body

Claims (1)

In a gas compressor that compresses a gas by rotating a rotating part including a rotor, a rotor shaft, and a pulley fixed to the rotor shaft ,
The pulley is set to have a diameter larger than that of the rotor, and the pulley is provided with an inertia moment adding portion for increasing the inertia moment,
The inertia moment adding part is
A gas compressor, wherein the gas compressor extends from a pulley outer peripheral portion so as not to have a larger diameter than the pulley and is provided between the pulley outer peripheral portion and a case body covering the gas compressor main body .

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