JP2015055171A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent, in a gas compressor, amplification of noises in a cavity portion formed between the outer peripheral wall of a pulley and a rotor in an electromagnetic clutch.SOLUTION: In a cavity portion 91c which is formed between the outer peripheral wall 91a of a pulley 91 and the outer peripheral wall 92a of a rotor 92 in an electromagnetic clutch 90 and is opened facing an armature 94 side, rubber 95 is filled. With this, a magnetization noise which is generated when the outer ring 94b of the armature 94 contacts with the side end face 92b of the rotor 92, and a separation noise which is generated when the outer ring 94b separates from the side end face 92b are prevented from being amplified in the cavity portion 91c.

Description

  The present invention relates to a gas compressor (compressor), and more particularly, to an improvement of an electromagnetic clutch that transmits power to a rotating shaft.

  Conventionally, a gas compressor having a compression chamber for compressing a gas such as a refrigerant gas into a high-pressure compressed gas is used in an air conditioning system (hereinafter referred to as an air conditioning system).

Among these gas compressors, those that operate by receiving power from the outside are provided with an electromagnetic clutch in order to switch between accepting input of the power and stopping the input.
The electromagnetic clutch is housed in a pulley that is wound around a peripheral wall with a belt or the like, rotated by receiving power, a rotor that is joined to an inner peripheral portion of the pulley and rotated together with the pulley, and a housing space formed in the rotor. And an armature that comes into contact with the outer surface of the rotor by magnetic flux generated by energization of the electromagnetic coil and leaves from the outer surface of the rotor when the magnetic flux disappears when energization of the electromagnetic coil is stopped (Patent Document 1).
Conventionally, the pulley and the rotor were integrally molded with a thick metal, but the thin pulley and the thick rotor were formed separately, and the rotor was joined to the inner peripheral side of the pulley. By integrating, the weight can be reduced.

Japanese Utility Model Publication No. 7-35830

As in the electromagnetic clutch described above, in the case where the pulley and the rotor are separately formed for the purpose of weight reduction, the extra weight is cut off, so the hollow portion formed between the outer peripheral wall of the pulley and the rotor Is open on the side of the armature to be attached to and detached from the outer surface of the rotor.
Here, when the armature is magnetized on the rotor, a magnetizing sound is generated from the contact portion between them, and when the armature is detached from the rotor, a separating sound is also generated.
Since the above-mentioned cavity portion is opened to the side where these sounds (magnetization sound, separation sound) are generated, these sounds enter the inside of the cavity from the opening portion and are amplified. The
As a result, there is a problem that a loud sound is generated each time the armature is magnetized or detached.

  The present invention has been made in view of the above circumstances, and provides a gas compressor capable of preventing sound amplification in a hollow portion formed between an outer peripheral wall of a pulley of an electromagnetic clutch and a rotor. With the goal.

The gas compressor according to the present invention prevents the amplification of sound in the hollow portion by closing at least the inlet portion of the hollow portion formed between the outer peripheral wall of the pulley of the electromagnetic clutch and the rotor. is there.
That is, the gas compressor according to the present invention includes a pulley having an outer peripheral wall and a rotor joined to an inner peripheral side portion of the pulley, and a cavity formed between the outer peripheral wall of the pulley and the rotor. The portion includes an electromagnetic clutch that opens to the side of the armature that is attached to and detached from the outer surface of the rotor, and at least the inlet portion that is open in the hollow portion is closed.

  According to the gas compressor of the present invention, it is possible to prevent amplification of sound in a hollow portion formed between the outer peripheral wall of the pulley of the electromagnetic clutch and the rotor.

It is a longitudinal section showing a vane rotary type compressor which is one embodiment of a gas compressor concerning the present invention. It is a side view by arrow A in FIG. FIG. 2 is an enlarged detailed cross-sectional view of an electromagnetic clutch in the compressor shown in FIG. 1. It is sectional drawing equivalent to FIG. 3 which shows other embodiment (Embodiment 2). It is sectional drawing equivalent to FIG. 3 which shows other embodiment (Embodiment 3).

  Hereinafter, an embodiment according to the gas compressor of the present invention will be described with reference to the drawings.

(Embodiment 1)
(Constitution)
A vane rotary type compressor 100 (hereinafter simply referred to as a compressor 100), which is an embodiment of a gas compressor according to the present invention, compresses a supplied refrigerant gas G (gas) to a high pressure as shown in FIG. The compressor main body 60 is accommodated inside the housing 10.
The compressor 100 is configured as a part of an air conditioning system (hereinafter, simply referred to as an air conditioning system) that performs cooling using the heat of vaporization of a cooling medium, and includes a condenser and an expansion that are other components of the air conditioning system. Along with a valve, an evaporator, etc., it is provided on the circulation path of the cooling medium.

The compressor 100 compresses the refrigerant gas G as a gaseous cooling medium taken from the evaporator of the air conditioning system, and supplies the compressed refrigerant gas G to the condenser of the air conditioning system.
The condenser heat-exchanges the compressed refrigerant gas G with ambient air and the like to dissipate heat from the refrigerant gas G and liquefy it, and sends it to the expansion valve as a high-pressure liquid refrigerant.
The high-pressure liquid refrigerant is reduced in pressure by the expansion valve and sent to the evaporator. The low-pressure liquid refrigerant absorbs heat from ambient air and vaporizes in the evaporator, and cools the air around the evaporator by heat exchange accompanying the vaporization of the refrigerant.
The vaporized low-pressure refrigerant gas G returns to the compressor 100 and is compressed, and the above steps are repeated thereafter.

The housing 10 includes a case 11 having one end closed and the other end opened, and a front head 12 covering the other open end of the case 11. The front head 12 is attached to the case 11 by a fastening member such as a bolt. It is assembled.
With the front head 12 assembled to the case 11, a space is formed inside the housing 10, and the compressor body 60 is accommodated in the space.
The front head 12 is connected to a low-pressure pipe 120 (pipe member) connected from the evaporator to form a suction port 12a (suction port, opening) for taking in the low-pressure refrigerant gas G. A high-pressure pipe 110 (pipe member) connected to the condenser is connected to form a discharge port 11a (discharge port, opening) for discharging the high-pressure refrigerant gas G compressed by the compressor body 60.
The suction port 12a is provided with a check valve for preventing the refrigerant gas G from flowing back from the inside of the housing 10 to the low-pressure pipe 120. However, the check valve is not shown in order to avoid complication. Yes.

The compressor main body 60 includes a rotating shaft 51, a rotor 50, a cylinder 40, a vane 58, a front side block 20, and a rear side block 30.
The rotating shaft 51 receives a driving force from a power source such as an engine via an electromagnetic clutch 90 connected outside the housing 10 and is driven to rotate about an axis C.
The rotor 50 is formed in a cylindrical shape and rotates integrally with the rotation shaft 51.
The cylinder 40 has an inner peripheral surface 41 having a substantially elliptical cross-sectional outline that surrounds the outer peripheral surface of the rotor 50 and is open at both ends.
The vane 58 is formed in a plate shape and is embedded in the rotor 50 so as to be able to protrude outward from the outer peripheral surface 52 of the rotor 50, and the tip on the protruding side follows the contour shape of the inner peripheral surface 41 of the cylinder 40. Thus, the amount of protrusion is variable, and it is arranged on the rotor 50 around the axis C at equal angular intervals.
For example, five vanes 58 (two, three, four, etc. other than five) may be provided.
The front side block 20 and the rear side block 30 are fixed so as to cover the open end surfaces from the outside of the open end surfaces on both sides of the cylinder 40, respectively.
The rear side block 30 is provided with an oil separator 70 that separates the refrigerating machine oil R (lubricating oil) from the refrigerant gas G.

The volume of the compression chamber 43, which is a space partitioned by two vanes 58 and 58 that follow each other along the rotation direction of the two side blocks 20 and 30, the rotor 50, the cylinder 40, and the rotation shaft 51, rotates. By repeating the increase / decrease according to the rotation of the shaft 51, the refrigerant gas G is sucked into the compression chambers 43 (intake stroke), the refrigerant gas G is compressed in the compression chambers 43 (compression stroke), and the compression chambers are compressed. The process of discharging the high-pressure refrigerant gas G from the inside 43 (discharge process) is repeated.
The compressor 100 is configured to perform a series of cycles of a suction stroke, a compression stroke, and a discharge stroke twice while the rotary shaft 51 rotates once.
Accordingly, the two suction strokes, the two compression strokes, and the two discharge strokes are set in ranges that are shifted from each other by a rotation angle of 180 degrees.

Inside the housing 10 is discharged from the suction chamber 13, which is a space through which the refrigerant gas G supplied through the suction port 12 a and sucked into the compression chamber 43 of the compressor body 60 passes, and the compression chamber 43 of the compressor body 60. A discharge chamber 14 which is a space through which the refrigerant gas G discharged through the port 11a passes is formed by the housing 10 and the compressor body 60, respectively.
The suction chamber 13 is a space surrounded by the front head 12 and the front side block 20 of the compressor main body 60, and partly a lip seal that seals the gap between the through hole of the front head 12 and the rotary shaft 51. A seal chamber 13 a provided with 53 is formed.
On the other hand, the discharge chamber 14 is a space surrounded by the case 11 and the rear side block 30 of the compressor body 60.

Refrigerating machine oil R separated from the refrigerant gas G by the oil separator 70 is stored at the bottom of the discharge chamber 14.
The refrigerating machine oil R includes oil passages 34 a and 34 b formed in the rear side block 30 of the compressor main body 60 by the high pressure of the refrigerant gas G discharged into the discharge chamber 14, an oil passage 44 formed in the cylinder 40, and the front side. Through the oil passage 24 formed in the block 20, it is supplied as a back pressure that causes the vane 58 to protrude outward.

The electromagnetic clutch 90 includes a pulley 91, a rotor 92, an electromagnetic coil 93, and an armature 94.
As shown in FIGS. 2 and 3, the pulley 91 is formed by plastically deforming a thin metal plate, and a belt is wound around the outer peripheral wall 91a so that power can be transmitted from a power source such as an engine. Receive input.
As shown in FIG. 3, the rotor 92 is made of a thick metal, and the inner peripheral side portion 91 b of the pulley 91 is welded to the outer peripheral wall 91 a of the rotor 92 so that the pulley 91 and the rotor 92 are integrated. It has become.

A cylindrical hollow portion 91 c is formed between the outer peripheral wall 91 a of the pulley 91 and the outer peripheral wall 92 a of the rotor 92.
The hollow portion 91c is filled with rubber 95, and the hollow portion 91c is closed including the inlet portion 91d that becomes the opening of the hollow portion 91c.
The rubber 95 is fixed by being press-fitted or bonded to the hollow portion 91c.
In addition, what is filled in the cavity part 91c is not limited to the rubber | gum 95, What is necessary is just a specific gravity lighter than a metal at least, for example, resin, glass wool, etc. may be sufficient.

The rotor 92 is fixed to the front head 12 via a radial bearing, and is rotatable about the rotation axis C.
Accordingly, when power is input to the pulley 91, the pulley 91 and the rotor 92 rotate about the axis C as a unit.
A cylindrical coil housing space 92c is formed in the rotor 92, and a cylindrical electromagnetic coil 93 is housed in the coil housing space 92c.

  The electromagnetic coil 93 is fixed to the front head 12 via the yoke 93a, does not rotate around the axis C, generates a magnetic flux when energized, and disappears when the energization is stopped.

The armature 94 includes an inner ring 94a, an outer ring 94b, and a leaf spring 94c.
The inner ring 94a is fastened to the end of the rotating shaft 51 protruding from the front head 12.
The outer ring 94b is formed to project outward in the radial direction from the inner ring 94a, and is formed of a material having a high friction coefficient.
The leaf spring 94c connects the inner ring 94a and the outer ring 94b, and within the range of elastic deformation of the leaf spring 94c along the direction in which the axis C extends, the outer ring 94a is connected to the inner ring 94a. 94b is allowed to displace.
As a whole, the armature 94 can rotate about the axis C integrally with the rotating shaft 51.

The outer ring 94b is disposed through a slight gap with respect to the side wall surface 92b (outer surface) orthogonal to the axis C of the rotor 92, but comes into contact with the side wall surface 92b of the rotor 92 by elastic deformation of the leaf spring 94c. In some cases, it is possible to rotate together with the rotor 92 by the frictional force generated between the side wall surface 92b.
A hollow portion 91c formed between the outer peripheral wall 91a of the pulley 91 and the outer peripheral wall 92a of the rotor 92 opens toward the outer ring 94b side of the armature 94.

Further, the armature 94 is attracted to the rotor 92 side by the magnetic flux generated by energizing the electromagnetic coil 93 and is in contact with the side wall surface 92b of the rotor 92. The armature 94 receives frictional force due to contact from the side wall surface 92b of the rotor 92. Thus, the rotation of the rotor 92 is transmitted.
On the other hand, when the energization of the electromagnetic coil 93 is stopped, the magnetic flux attracting the armature 94 disappears, the armature 94 is separated from the side wall surface 92b of the rotor 92, and the rotation of the rotor 92 is not transmitted.
Therefore, when the rotational driving force from a power source such as an engine is constantly input to the pulley 91 and the pulley 91 and the rotor 92 are constantly rotating, the rotation of the rotor 92 is performed when the electromagnetic coil 93 is not energized. Is not transmitted to the armature 94 and the rotating shaft 51 does not rotate. On the other hand, when the electromagnetic coil 93 is energized, the rotation of the rotor 92 is transmitted to the armature 94 and the rotating shaft 51 rotates.
In this way, the electromagnetic clutch 90 switches between driving and stopping the compressor 100 according to whether or not the electromagnetic coil 93 is energized.

(Function)
According to the compressor 100 of the present embodiment configured as described above, when the electromagnetic coil 93 of the electromagnetic clutch 90 is energized, the pulley 91 and the rotor 92 that are always rotated by the power input from the power source, The armature 94 is connected to the armature 94 to rotate, thereby rotating the rotating shaft 51.

Here, when the outer ring 94b of the armature 94 is magnetized on the side wall surface 92b of the rotor 92 by the magnetic flux generated by the electromagnetic coil 93, a magnetizing sound is generated due to the strong contact between the metals.
Since the cavity 91c is opened toward the outer ring 94b, the magnetized sound has a cavity portion from the inlet portion 91d where the magnetized sound is opened in the compressor described in the prior art document. Since it entered 91c and was amplified inside the hollow portion 91c, it was loud.
Further, when the outer ring 94b of the armature 94 that is in contact with the rotor 92 by the magnetic flux is separated from the side wall surface 92b of the rotor 92, the electromagnetic clutch 90 generates a separation sound, and this separation sound is also generated from the inlet portion 91d. Since it entered the hollow portion 91c and was amplified inside the hollow portion 91c, the sound was loud.

On the other hand, in the compressor 100 of the present embodiment, the hollow portion 91c including the inlet portion 91d is closed by the filled rubber 95.
As a result, the magnetized sound and the separation sound are not amplified by entering the hollow portion 91c, and therefore the magnetization sound and the separation sound do not become loud.
As described above, according to the compressor 100 of the present embodiment, the hollow portion 91c formed between the outer peripheral wall 91a of the pulley 91 of the electromagnetic clutch 90 and the outer peripheral wall 92a of the rotor 92 and opened toward the armature 94 side. Amplification of sound can be prevented.

Further, in the compressor 100 of the present embodiment, the thin pulley 91 and the thick rotor 92 are separately formed and then integrated, so that both are integrated with a thick member. The weight can be reduced as compared with the one formed in a conventional manner.
Since the rubber portion 95 c is filled with the rubber 95, vibration generated when the outer ring 94 b of the armature 94 hits the side wall surface 92 b of the rotor 92 can also be absorbed by the rubber 95.

(Embodiment 2)
In the compressor 100 according to the first embodiment described above, the entire hollow portion 91c formed between the outer peripheral wall 91a of the pulley 91 and the outer peripheral wall 92a of the rotor 92 is blocked by the filled rubber 95. However, the gas compressor according to the present invention is not limited to this form, as long as at least the inlet portion that opens toward the armature side of the hollow portion is closed. Good.
For example, as shown in FIG. 4, the electromagnetic clutch in which only the inlet portion 91 d that opens toward the armature 94 in the hollow portion 91 c is closed by a plate-like or other shape lid member 96. 90 can also be applied.

According to the compressor 100 provided with the electromagnetic clutch 90, the magnetizing sound and separation sound of the electromagnetic clutch 90 are blocked by the lid member 96, so that the sound does not enter the hollow portion 91c and the sound is amplified in the hollow portion 91c. Can be prevented.
Further, the compressor 100 including the electromagnetic clutch 90 can reduce the weight as in the first embodiment.
Moreover, the electromagnetic clutch 90 in the compressor 100 of the first embodiment is filled with the rubber 95 in substantially the entire hollow portion 91c, whereas the electromagnetic clutch 90 in the second embodiment has an inlet portion 91d of the hollow portion 91c. Since only the lid member 96 is provided in the upper portion of the hollow portion 91c and most of the hollow portion 91c remains hollow, the weight can be further reduced as compared with the compressor 100 of the first embodiment.

Note that the lid member 96 may be rubber, resin, or the like, or metal.
Further, the lid member 96 may be press-fitted and fixed in the hollow portion 91c, or may be bonded and fixed.

(Embodiment 3)
In the compressor 100 of the second embodiment described above, the lid member 96 is newly formed and fixed to the inlet portion 91d of the hollow portion 91c. However, the gas compressor according to the present invention is not limited to this form. As the lid member 96, for example, as shown in FIG. 5, a portion 94e (hereinafter referred to as an extended portion 94e) in which the outer ring 94b of the armature 94 is extended outward in the radial direction can be applied.
The extension portion 94e is disposed at the inlet portion 91d only in a state where the outer ring 94b of the armature 94 is magnetized on the side wall surface 92b of the rotor 92, and in a state where the outer ring 94b is detached from the side wall surface 92b of the rotor 92, Although it is in a state separated from the entrance portion 91d, the extension portion 94e also prevents the magnetized sound and the separation sound from entering the cavity portion 91c as in the case of the lid member 96 in the second embodiment. Sound amplification can be prevented.

90 electromagnetic clutch 91 pulley 91a outer peripheral wall 91c hollow portion 91d inlet portion 92 rotor 92b side wall surface 93 electromagnetic coil 94 armature 94b outer ring 95 rubber 100 compressor C shaft center G refrigerant gas R refrigerating machine oil

Claims (7)

An armature having a pulley having an outer peripheral wall and a rotor joined to an inner peripheral side portion of the pulley, and a hollow portion formed between the outer peripheral wall of the pulley and the rotor is attached to and detached from the outer surface of the rotor With an electromagnetic clutch opening on the side of
A gas compressor in which at least an open inlet portion of the hollow portion is closed.   The gas compressor according to claim 1, wherein the hollow portion is filled with a filling member, and the inlet portion is closed.   The gas compressor according to claim 2, wherein the filling member is formed of rubber or resin.   The gas compressor according to claim 1, wherein a lid member that closes the inlet portion is disposed, and the inlet portion is closed.   The gas compressor according to claim 4, wherein the lid member is press-fitted or bonded to the inlet portion.   The gas compressor according to claim 4, wherein the lid member is formed of rubber or resin. The lid member is formed by a portion in which the armature is extended outward in the radial direction,
The gas compressor according to claim 4, wherein the lid member is disposed at the inlet portion only in a state where the armature is magnetized on the outer surface of the rotor.

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