JP3099266B2 - Gas compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a gas compressor used for a refrigerator or an air conditioner.

[0002]

2. Description of the Related Art A conventional gas compressor as shown in FIG. 7 is known. As shown in FIG. 7, the gas compressor includes a rotor in a cylinder chamber 2 formed by a cylindrical cylinder block 1 having an inner peripheral surface having an elliptical cross section in the axial direction (the front-rear direction in FIG. 7). 3 is rotatably arranged. As shown in FIG. 7, multiple slits 4 are provided in the axial direction of the rotor 3, and a vane 5 is slidably accommodated in each slit 4 in a radial direction. Two side blocks (not shown) are fixed to both end surfaces of the cylinder block 1 in parallel with each other, and a cylinder chamber 2 as shown in FIG. 7 is formed.

A notch 6 is formed in the outer peripheral wall of the cylinder block 1 by cutting out the end of the compression step by the vane 5, and the gas compressed in the cylinder chamber 2 is discharged into the notch 6. For this purpose, as shown in FIG. 8, two ejection holes 7 are provided. A discharge valve 8 for opening and closing the discharge holes 7, 7 is attached to a notch 6 in the circumferential direction of the cylinder block 1 by a bolt 9 as shown in FIG. The bolt 9 engages with the screw hole 9A. Immediately after the outlet side of the discharge hole 7, a case 11 surrounding the outer surface of the cylinder block 1 and the surface of the discharge valve mounting portion 6 as shown in FIG.
And a discharge gas chamber 17 surrounded by reinforcing ribs 6A provided on both sides of the discharge valve mounting portion 6. The discharge gas chamber 17 is connected via a communication passage to a discharge chamber (not shown) for temporarily storing the compressed gas.

In the conventional gas compressor having such a configuration, when the rotor 3 rotates, the vane 5 is slid by being pressed against the inner peripheral surface of the cylinder chamber 2 by centrifugal force or the like.
As a result, the volume of the space formed by the vane 5 and the inner peripheral surface of the cylinder chamber 2 changes, and the change in the volume is used to suck and compress the gas. 7 to the discharge gas chamber 17. The discharged gas is then discharged to the outside via a discharge chamber (not shown).

[0005]

Since the gas discharged from the gas compressor has a pulsation due to the discharge pressure, the gas compressor is designed to reduce the discharge pulsation and reduce noise. A muffler (muffler) is provided in a discharge pipe connected to the outside of the discharge side. In addition, for the same purpose as above, instead of the above-mentioned discharge piping, the actual
As described in Japanese Patent Application Publication No. -10484, there is known a gas compressor in which a space having a function of a silencer is provided on the outer periphery of a gas compressor. However, in the case where a muffler is provided in the discharge pipe, there are problems that the size of the discharge pipe increases and the cost required for welding and the like increases. On the other hand, in the case where a space having a silencer function is provided on the outer periphery of the gas compressor, there are problems that the gas compressor becomes large and hinders installation.

Accordingly, an object of the present invention is to provide a gas compressor capable of reducing noise accompanying discharge pulsation without increasing the size at low cost.

[0007] To achieve such an object, the present invention provides:
A cylindrical syringe having an inner peripheral surface with an elliptical axial cross section
Dublock and flanges fixed parallel to both end faces
With front side block and rear side block
And an elliptical cylindrical shape formed by them.
A cylinder chamber, at least one discharge hole formed in the cylinder block, and an open end at one end.
A casing surrounding the constriction, and an opening in the casing
Front head mounted to seal the front
The switch is housed inside the cylinder chamber and is provided in the axial direction.
A rotor having a lit and the slit of the rotor
It is slidably held, and the centrifugal force and the
And the vane back pressure acting on the bottom of the slit
The gas rotates under pressure while closely contacting the inner peripheral wall of the cylinder chamber.
Condensation vanes, consists city, compress sucks gas from the suction hole by the rotation of the rotor, a gas compression portion for discharging the compressed gas from the discharge hole, the outlet of the discharge hole of the gas compressor unit The discharge gas chamber formed immediately after the side, and the discharge hole of the outer peripheral wall of the cylinder block.
Near the side wall and the surface of the cylinder block in the circumferential direction.
The notch formed by notching except for the notch
The opening of this notch is formed on the inner peripheral surface of the casing.
By covering by a silencer chamber formed at least two said discharge gas chamber is partitioned in accordance with the discharge hole, drilled in the sidewalls of the discharge gas chamber, the discharge gas discharged from the discharge hole and a discharge hole for exhausting from the gas chamber, before
A communication hole formed in the partitioning portion and communicating between the muffling chambers, the communication hole having a cross-sectional area approximately equal to that of the discharge hole and approximately half of the discharge hole.

As described above, according to the present invention, the discharge gas chamber 34 formed immediately after the outlet side of the discharge hole 7 of the gas compression section 10 includes:
The discharge gas chamber 34 is partitioned in accordance with the discharge holes 7 to form at least two silence chambers 37 and 38, and the silence chamber 3
7 and 38, the cross-sectional area of which is approximately the same as that of the discharge hole 7, so that a communication hole 36a of about 1/2 of the discharge hole 32a is formed.
And a partition portion 36. For this reason, in the present invention, the noise caused by the discharge pulsation due to the gas discharged from the discharge hole 7 of the gas compression unit 10 can be reduced by the sound deadening unit. Also, the inside of the discharge valve mounting surface 33a of the notch 33
In the circumferential direction of the central cylinder block 13, the silencers 37, 3
8 are provided. others
To increase the rigidity of the discharge valve mounting surface 33a,
Deformation due to large internal pressure can be prevented, improving durability
I do. At the same time, the discharge valve of the notch 33 is removed.
Vibration of the attachment surface 33a can be prevented, and noise accompanying this vibration can be reduced.
Can be prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to FIGS. FIG.
Shows a cross-sectional view of a gas compressor of an embodiment of the present invention,
FIG. 3 is a sectional view taken along line B1-B2 of FIG. 2. FIG.
It is sectional drawing of the 1-A2 line. FIG. 3 is a perspective view showing a schematic configuration of the discharge gas chamber. FIG. 4 is a front view of a cutout portion of the cylinder block. FIG. 5 shows C1-C2 of FIG.
It is sectional drawing of a line. As shown in FIG. 1, the gas compressor includes a gas compressor 10 and a casing 11 surrounding the gas compressor.
And a front head 12. Casing 11
Has an opening at one end, and a front head 12 is attached so as to seal this opening. The gas compressing unit 10 includes a cylindrical cylinder block 13 having an inner peripheral surface having an elliptical cross section in the axial direction, and a front side block 14 and a rear side block 15 fixed to both end surfaces in parallel with each other. These form an elliptical cylindrical cylinder chamber 2.

As shown in FIG. 2, a rotor 3 having five vanes 5 slidably held in slits 4 is accommodated in the cylinder chamber 2. Each slit 4 for slidably holding the vane 5 is provided in the axial direction of the rotor 3. The rotor shaft 3 integrated on the left and right of the rotor 3
A and 3b are slightly larger in diameter than these, and are rotatably supported in shaft bearing holes 18a and 18b formed in the front side block 14 and the rear side block 15, respectively. The end of the rotor shaft 3a is connected to a prime mover (not shown).
The vanes 5 are configured to rotate and compress refrigerant gas while being in close contact with the inner peripheral wall of the cylinder chamber 2 due to centrifugal force and vane back pressure.

Next, a description will be given of a structure of a noise reduction unit for reducing noise due to pulsation of gas discharged from the discharge hole 7 of the cylinder block 13. FIG. As shown in FIGS. 2 and 3, the silencer is provided immediately after the outlet of the discharge hole 7 for discharging the gas compressed in the cylinder chamber 2.
The discharge gas chamber 34 is partitioned by a partition portion 36 to form two noise reduction chambers 37 and 38.
The section 7 and the muffling chamber 38 are configured such that a section formed in the thickness direction of the partition section 36 communicates with a circular communication hole 36a. The silencing chambers 37 and 38 have a large cross-sectional area, the communication hole 36a of the partition 36 has a smaller cross-sectional area than the silencing chambers 37 and 38, and the silencers 37 and 38 and the communication hole 36a as a whole reduce noise. Forming a bowl.

The muffle chambers 37 and 38 are provided in the cylinder block 1
In the outer peripheral wall 3, the vicinity of each discharge hole 7 is defined as a side wall (rib) 3.
Notch portions 33, 33 are cut out in the circumferential direction of the cylinder block 13 except for the portions 1, 32 and the partition portion 36.
Is formed by covering the openings of the notches 33, 33 with the inner peripheral surface of the casing 11. A discharge hole 32a is formed in the thickness direction of the side wall 32. The discharge hole 32a communicates with a passage (not shown) formed inside the rear side block 15, the oil separator 24, and the discharge chamber 25. Have been. The rear end side of the discharge valve 8 is fixed to the discharge valve mounting surface 33 a of the cutout portion 33 by a bolt 9 so that each discharge hole 7 can be opened and closed by the discharge valve 8. As shown in FIGS. 4 and 5, the bolt 9 is configured to mesh with a screw hole 35 provided on the discharge valve mounting surface 33 a of the notch 33. here,
The cross-sectional area of the communication hole 36 a formed in the partition portion 36 is substantially equal to the cross-sectional area of the discharge hole 7, and the discharge hole 32 formed in the side wall 32.
It is preferable that the cross-sectional area of “a” is set to about の in that the noise reduction effect can be achieved without increasing the power loss of the gas compressor.

As shown in FIG. 1, a suction chamber 22 is formed in the front head 12, and an intake port 23 for sucking a refrigerant gas to be compressed from an evaporator (not shown) is formed in the suction chamber 22. . The front side block 14 is formed with a suction port 14 a for communicating the suction chamber 22 and the cylinder chamber 2, and a part of the suction port 14 a is connected to an inlet side of a suction passage 13 a provided in the cylinder block 13. ing. The outlet side of the suction passage 13 a is provided in the rear side block 15 and is connected to a suction port 15 a communicating with the cylinder chamber 2. Accordingly, the refrigerant gas (suction gas) sucked into the suction port 23 is sucked into the cylinder chamber 2 from the suction port 14a as shown in the drawing, while passing through the suction port 14a, the suction passage 13a, and the suction port 15a. And is sucked into the cylinder chamber 2.

The discharge hole 7 is formed in the cylinder block 13 as described above. The refrigerant gas discharged from the discharge hole 7 is discharged to a discharge gas chamber 34 shown in FIG. After being exhausted from the pump, the oil reaches an oil separator 24 through a passage (not shown) formed inside the rear side block 15, and is separated from the oil by the oil separator 24. Gas compressor 10 and casing 1
A discharge chamber 25 is formed between the discharge chamber 1 and the refrigerant chamber 1, and the refrigerant gas separated by the oil separator 24 is discharged into the discharge chamber 25. A discharge port 26 is formed in the casing 11 above the discharge chamber 25 so that the refrigerant gas in the discharge chamber 25 is discharged to the outside via the discharge port 26 and supplied to a condenser (not shown). Has become. The oil separated by the oil separator 24 is stored in an oil sump 27 formed at the bottom of the discharge chamber 25.

At the center of the front side block 14 on the cylinder chamber 2 side, a fan-shaped vane back pressure chamber (Saray) 28a is provided.
Is provided. The vane back pressure chamber 28a includes a shaft support hole 18a, an oil supply passage 29d provided in the front side block 14, an oil supply passage 29c provided in the cylinder block 13, and an oil supply passage 29a provided in the rear side block 15. , 29b to the oil sump 27. A fan-shaped vane back pressure chamber 28b is provided at the center of the rear side block 15 on the cylinder chamber 2 side. The vane back pressure chamber 28b is connected to the oil sump 27 via a shaft support hole 18b and an oil supply path 29a provided in the rear side block 15.

Next, the operation of the embodiment configured as described above will be described. Now, when the rotor 3 is driven to rotate by a motor (not shown), the suction gas flows into the suction port 23.
Is sucked into the cylinder chamber 2 via the suction chamber 22 and the like, and is compressed by the vane 5 and discharged from the discharge hole 7. As shown in FIG. 3, the discharged gas reaches the oil separator 24 via a discharge gas chamber 34 provided immediately after the outlet side of the discharge hole 7, and is separated from oil by the oil separator 24. Then, only the discharge gas is discharged from the discharge port 26 of the discharge chamber 25 to the outside.

During the operation of such a gas compressor, a high pressure difference is generated between the discharge chamber 25 and the vane back pressure chambers 28a, 28b on the discharge chamber 25 side. Therefore, the oil (lubricating oil) in the oil sump 27 of the discharge chamber 25 is supplied to the oil supply passage 29a,
The oil flows to the bottom of the slit 4 of the rotor 3 via the oil supply path 29b, the oil supply path 29c, the oil supply path 29d, the shaft support hole 18a, and the vane back pressure chamber 28a. At the same time, the oil in the oil sump 27 flows to the bottom of the slit 4 via the oil supply passage 29a, the shaft bearing hole 18b, and the vane back pressure chamber 28b. For this reason, the vane 5 rotates while being in close contact with the inner peripheral wall of the cylinder chamber 2 due to the centrifugal force caused by the rotation of the rotor 3 and the pressure (vane back pressure) acting on the bottom of the slit 4.

Immediately after the outlet side of the discharge hole 7 provided in the cylinder block 13, a discharge gas chamber 34 constituting the silencer 30 is provided.
The sound-absorbing chamber 3 having a large sectional area partitioned by the partition portion 36
7 and 38 are formed, and the two sound deadening chambers 37 and 38 are communicated with each other by a communication hole 36 a of a partition 36 having a small sectional area. For this reason, since the discharge gas chamber 34 forms a small silencer as a whole, the discharge holes 7 of the cylinder block 13 are formed.
The discharge pulsation of the gas discharged from is reduced when passing through the discharge gas chamber 34, and the noise caused by the discharge pulsation is reduced. On the other hand, in the circumferential direction of the cylinder block 13 at the center of the discharge valve mounting surface 33a of the notch 33,
A partition 36 for forming the nozzle 38 is provided. The partition 36 increases the rigidity of the discharge valve mounting surface 33a, prevents deformation of the cylinder chamber 2 due to a large internal pressure, and improves durability. At the same time, the vibration of the discharge valve mounting surface 33a of the notch 33 can be prevented, and the noise caused by the vibration can also be prevented.

Further, in this embodiment, since the silencer can be realized by the simple configuration as described above, the production cost of the silencer can be reduced. Further, in this embodiment, since the muffler is provided inside the gas compressor, the overall size can be reduced without affecting the appearance.

As described above, in this embodiment, the communication hole 3 is formed in the partition 36 that partitions the inside of the discharge gas chamber 34.
6a was drilled, and the drilling position was set at the same distance from the two discharge holes 7 and the shortest position. However, as shown in FIG. 6, the position of the communication hole 36a formed in the partition 36 is
The position may be relatively distant from the two discharge holes 7, 7, and the position where the partition 36 is provided is not limited.

[0021]

As described above, according to the gas compressor of the present invention, the discharge gas chamber formed immediately after the outlet side of the discharge hole of the gas compression section and the discharge gas chamber are partitioned according to the discharge hole. and forming at least two muffler chambers, communicating between the muffler chamber, the cross-sectional area of the discharge hole at the same level as the discharge hole 1 /
A partition portion having approximately two communication holes was provided . For this reason, in the present invention, the noise caused by the discharge pulsation by the discharge gas from the discharge hole of the gas compression unit can be reduced by the sound deadening unit. In addition, the discharge valve is attached to the notch 33.
In the circumferential direction of the cylinder block 13 at the center of the surface 33a,
A partition 36 for forming the sound chambers 37 and 38 is provided.
You. Therefore, the rigidity of the discharge valve mounting surface 33a is increased, and
Deformation due to large internal pressure of the Linden chamber 2 can be prevented,
The durability is improved. At the same time, the notch 33
Of the discharge valve mounting surface 33a can be prevented.
The accompanying noise can also be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the entire configuration of a gas compressor according to an embodiment of the present invention, and is a cross-sectional view taken along line B1-B2 in FIG.

FIG. 2 is a sectional view taken along line A1-A2 of FIG.

FIG. 3 is a perspective view showing a schematic configuration of a discharge gas chamber.

FIG. 4 is a front view of a cutout portion of the cylinder block.

FIG. 5 is a sectional view taken along line C1-C2 in FIG. 4;

FIG. 6 is a perspective view showing another configuration of the discharge gas chamber.

FIG. 7 is a cross-sectional view illustrating a configuration of a conventional gas compressor.

FIG. 8 is a front view of a cutout portion of a conventional cylinder block.

FIG. 9 is a sectional view taken along line D1-D2 of FIG. 8;

[Description of Signs] 2 Cylinder chamber 3 Rotor 4 Slit 5 Vane 7 Discharge hole 10 Gas compression section 13 Cylinder block 31, 32 Side wall 33 Notch section 34 Discharge gas chamber 36 Partition section 36a Communication hole 37, 38 Muffle chamber

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Shimada 4-3-1 Yashiki, Narashino-shi, Chiba Seiko Seiki Co., Ltd. Field surveyed (Int. Cl. ⁷ , DB name) F04C 23/00-29/10 331 F04C 18/30-18/352

Claims (1)

(57) [Claims] 1. An inner peripheral surface having an elliptical cross section in an axial direction.
Cylindrical cylinder block and both ends parallel to each other
Front side block and rear side fixed to
Composed of blocks and formed by these
And elliptic cylindrical cylinder chamber, and at least one discharge hole formed in the cylinder block, and open at one end, cable surrounding said gas compression portion
Shing and attached to seal the opening of the casing
Front head , housed inside the cylinder chamber, and provided in the axial direction.
A rotor having a slit, slidably held by the slit of the rotor,
Centrifugal force due to the rotation of the rotor and the bottom of the slit
Due to the acting vane back pressure, the inner peripheral wall of the cylinder chamber is tightly closed.
Vane rotates while wearing compressing gas, consists city, compress sucks gas from the suction hole by the rotation of the rotor, a gas compression portion for discharging the compressed gas from the discharge hole, the gas A discharge gas chamber formed immediately after the outlet side of the discharge hole of the compression section, and a portion of the outer peripheral wall of the cylinder block near the discharge hole.
With a side wall and a partition in the circumferential direction of the cylinder block.
Notch formed except for the part of the part
Then, the opening of the cutout is formed by the inner peripheral surface of the casing.
Ri by covering the muffler chamber which is formed at least two said discharge gas chamber is partitioned in accordance with the discharge hole, drilled in the sidewalls of the discharge gas chamber, the discharge gas discharged from the discharge hole A discharge hole for exhausting from the gas chamber, and a communication hole formed in the partition portion and communicating between the muffling chambers and having a cross-sectional area approximately equal to that of the discharge hole and about half of the discharge hole. A gas compressor comprising: