JPH062689A - Delivery muffler for compressor - Google Patents

Abstract

PURPOSE:To prevent breakage or falling of a cover by providing a release part to release muffler inside abnormal pressure in a delivery muffler composed of a bearing member to form a compression chamber by blocking up the opening edge of a cylinder and the cover installed in the same member. CONSTITUTION:In a rolling piston type rotary compressor, gas compressed in a cylinder flows into a delivery muffler 13 through a delivery port 19 and a delivery valve 20, and is discharged to a compressor housing from annular clearance 33 between a cover 30 and an upper bearing 8 in a condition that a pulsation component is removed there, and is delivered outside from a delivery pipe. In this case, a spring 32 is fitted on an installation bolt 31 of the cover 30 installed on the upper bearing 8. When high pressure is generated in inner space of the delivery muffler 13 due to liquid compression and so on, since the cover 30 rises from the upper bearing 8 against the spring 32, clearance is created between the outer peripheral edge of the upper bearing 8 and the outer peripheral edge of the cover 30, so that high pressure can be dispersed from this clearance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge muffler of a rotary compressor.

[0002]

2. Description of the Related Art FIG. 12 is a longitudinal sectional view of a conventional rolling piston type rotary compressor, and FIG. 13 is a transverse sectional view of a compression mechanism portion of the same compressor. In FIG. 12, 1 is a housing, 2 is a motor housed in the housing, 2a is a stator of the motor, 2b is a rotor of the motor, 3 is a compression mechanism part housed in the housing, 4 is a motor rotor. Connected to the shaft, 5 is a crankpin of the same shaft, 6 is a rotor fitted to the crankpin, 7 is a cylinder, 8 is an upper bearing, 9 is a lower bearing, 13
Is a discharge muffler provided in the upper bearing 8, 12 is a suction pipe,
Reference numeral 16 is a discharge pipe provided on the upper part of the housing. Figure 1
3, numeral 10 is a blade, 11 is a suction chamber formed in the cylinder 7, 14 is a compression chamber formed in the cylinder, 15 is a discharge port notch, and 18 is a blade groove in which the blade slides. , 17 are springs that press the blade against the rotor 6.

FIG. 14 is a vertical sectional view of the discharge muffler 13 of the compressor, and FIG. 15 is a plan view of the muffler. In the figure, 19 is a discharge port, 20 is a discharge valve, 21 is a cover that forms the outer wall of the discharge muffler 13, 22 is a mounting bolt for the cover, and 23 is an annular gap between the cover 21 and the upper bearing 8.

In this compressor, when the shaft 4 is rotationally driven by the motor 2, the rotor 6 fitted to the crank pin 5 of the shaft 4 eccentrically rotates inside the cylinder 7, and accordingly the cylinder 7 and the rotor 6 are rotated. Gas is sucked from the suction pipe 12 into the suction chamber 11 that is limited by the upper bearing 8, the lower bearing 9, and the blade 10, and is compressed. The compressed gas flows into the discharge muffler 13 from the compression chamber 14 through the discharge port notch 15, the discharge port 19, and the discharge valve 20, where the pulsating component is removed, and the gas is removed from the cover 21 along the arrow X in FIG. It is discharged from the annular gap 23 between the upper bearings 8 into the housing 1, and discharged from the discharge pipe 16 through the gap between the motor stator 2a and the motor rotor 2b.

Although FIG. 14 shows an example in which gas is discharged from the annular gap 23, there is no such gap, and instead a plurality of gas discharge holes are provided in the cover, and gas is discharged from the holes. Some are done.

[0006]

When a condition in which the liquid and the gas are mixed in the cylinder 7 is generated, the liquid is compressed and a high pressure is generated in the discharge muffler 13. Therefore, a large stress is generated in the cover 21. Due to this repetitive stress, the cover 21 is sometimes damaged and drops off, and when it drops off, the coil of the stator 2a is damaged.

The present invention is intended to solve the above-mentioned drawbacks of the prior art and to prevent the cover from being damaged or falling off even if a high pressure is generated in the discharge muffler.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a discharge muffler is formed by a bearing member that closes the open end of a cylinder to form a compression chamber and a cover that is mounted on the member. However, the present invention relates to a discharge muffler having the following characteristics in a discharge muffler of a compressor that discharges gas compressed in a compression chamber via the same discharge muffler. (1) The muffler is provided with a discharge portion that discharges the abnormal pressure due to the movement of the cover itself due to the abnormal pressure rise in the muffler or the deformation of the elastic member forming the cover. (2) The cover is movable along the mounting bolt, and a spring is provided to press the mounting surface of the cover against the cover mounting surface of the bearing member. (3) An outer member fixed to the bearing member, which includes an end surface having a sufficient gap with respect to the outer diameter of the shaft portion of the bearing member and an outer peripheral surface continuing to the outer peripheral edge of the end surface, and both end portions of the band-shaped elastic member. Is formed into a substantially cylindrical shape by overlapping and the inner member is in contact with one end of the outer member in the vicinity of the inner edge of the end face, and the inner member can be restored by tightening due to the pressure difference between the inner and outer discharge mufflers. Be fixed to. (4) The cover is provided with a valve plate portion that is elastically deformed and opened / closed based on the pressure difference between the inside and outside of the discharge muffler. (5) An opening is provided on the side surface of the cover, and the opening is
One end is fixed to the cover and the other end is covered and closed by a leaf spring held movably along the side surface of the cover, and the leaf spring is deformed by the pressure difference between the inside and outside of the discharge muffler to open the closing portion. thing. (6) A cutout is provided in the bearing member, the cover is made of an elastically deformable material, and the cover is installed so that the inner edge of the cover is adjacent to the cutout, and the pressure difference between the inside and outside of the discharge muffler is set. When the cover is deformed by, the cutout portion increases the flow passage cross-sectional area.

[0009]

[Action]

(Means 1) In the discharge muffler of the present invention, when a high pressure such as liquid compression is generated in the muffler, the cover itself moves, or a part or the whole of the cover is deformed so that the pressure discharge part is formed. Form and release high pressure. (Means 2) When a high pressure is generated in the muffler, the cover moves against the pressing force of the spring, and the high pressure is released between the cover and the bearing member. (Means 3) When a high pressure is generated in the muffler, the inner member is tightened, and the high pressure is released from between the inner edge of the end surface of the outer member and the inner member. (Means 4) When a high pressure is generated in the muffler, the valve plate portion provided on the cover is deformed to release the high pressure. (Means 5) When a high pressure is generated in the muffler, the leaf spring covering the opening is deformed and a gap is created between the leaf spring and the cover, so that the high pressure is released through the opening and the gap. (Means 6) When a high pressure is generated in the muffler, the cover is deformed to form a flow path between the inner edge portion and the cutout portion or further increase the flow path, and the high pressure is released from the flow passage. .

[0010]

1 is a vertical sectional view of a first embodiment of a discharge muffler of the present invention, and FIG. 2 is a plan view of the same discharge muffler. In the figure, 4 is a shaft, 8 is an upper bearing, 19 is a discharge port,
20 is a discharge valve, 13 is a discharge muffler, 30 is a discharge muffler 1.
3, a cover forming the outer wall of 3, a mounting bolt 31 for mounting the cover 30 on the upper bearing 8, a spring 32 interposed between the head of the mounting bolt and the discharge muffler, 33 a cover 30 and the upper bearing 8 Annular gap between the two, X is the same gap 33
A gas flow in a normal time via Y, Y is a flow of a fluid generated only when the internal space of the discharge muffler becomes particularly high in pressure, as described later.

In this device, when a spring 32 is provided on a mounting bolt 31 of a cover 30 mounted on the upper bearing 8, when a high pressure due to liquid compression or the like is generated in the internal space of the discharge muffler, the cover 30 is removed. Floats above the upper bearing 8 against the pressing force of the spring 32, and the discharge muffler 13
As the inner volume of the upper bearing 8 increases, a gap is created between the outer peripheral edge of the upper bearing 8 and the outer peripheral edge of the cover 30, and the gap expands so that high pressure is released along the arrow Y. This can prevent the cover 30 from being damaged and further improve the reliability.

FIG. 3 is a vertical sectional view of a second embodiment of the discharge muffler of the present invention, FIG. 4 is a sectional view taken along the line AA of FIG. 3, and FIG. 5 is a perspective view of an inner member of the discharge muffler. In the figure, 8a
Is a boss portion formed in a part of the lower end of the upper bearing 8 in an excess thickness state. A muffler cover 40 is composed of an outer member 41 and an inner member 42. Outer member 4
A cylindrical outer peripheral surface 41a and a flat plate-shaped upper surface 41b are integrated with each other, and a gas discharge hole 43 at a normal pressure is provided on the upper surface 41b. This member is fixed to the upper bearing 8 at the peripheral edge. Also the inner member 4
As shown in FIG. 5, 2 is a substantially cylindrical shape having overlapping portions 44 at its ends. Reference numeral 45 is a bolt insertion hole provided in a portion other than the above-mentioned overlapping portion. Reference numeral 46 in FIGS. 3 and 4 denotes a bolt for attaching the inner member 42 to the boss portion 8a of the upper bearing 8 using the bolt insertion hole 45. Reference numeral 47 is a gap formed between the inner member 42 and the upper bearing 8.

In the present apparatus, the inner member 42 is made of an elastic material and is elastically deformed based on the pressure difference between the inside and outside of the muffler cover 40. If the pressure in the muffler becomes large, it will be tightened and the discharge muffler will be opened. That is, at this time, the internal space of the muffler communicates with the external space of the muffler in the housing through the gap 47, and the high pressure is discharged from the gas discharge hole 43 and this communication part, and the pressure inside the muffler is reduced. When the pressure in the muffler reaches the normal pressure, the inner member 42 is rewound to close the discharge muffler. Here, the predetermined pressure difference for opening and closing the inner member 42 is appropriately selected according to the fracture strength due to factors such as the material of the material forming the muffler and the wall thickness. During normal operation,
Even if the inner member 42 does not necessarily completely close the discharge muffler, the amount of gas discharged is smaller than that of the hole 43, as long as the muffler function of the discharge muffler is not impaired.

FIG. 6 is a longitudinal sectional view of a third embodiment of the discharge muffler of the present invention, and FIG. 7 is a perspective view of an inner member of the discharge muffler. In the figure, 8c and 8b are parts provided in the lower part of the upper bearing 8, 8c is a tapered portion whose outer diameter increases as it goes downward, and 8b is a constant outer diameter under the tapered portion 8c. Is a straight portion provided with. A discharge muffler is formed by covering the outer surface of the upper bearing with the cover 50. The cover 50 includes an outer member 51 and an inner member 52. The outer member 51 has the same structure as the outer member of the second embodiment described above, and has a shape in which a cylindrical outer peripheral surface 51a and a flat plate-shaped upper surface 51b are integrated, and the upper surface 51b is normally formed. A gas discharge hole 53 at the time of pressure is provided. This member is fixed to the upper bearing 8 at the peripheral edge. As shown in FIG. 7, the inner member 52 is formed by forming a flat plate into a substantially cylindrical shape, and the slit 54 is cut halfway downward from the upper end over the entire circumference, and a large number of valve plates 55 are formed. Supporting portions 56 which are formed and are bent outwardly at arbitrary intervals are alternately provided with the valve plate 55 in this example.

The inner member 52 is supported at its lower end by the straight portion 8b of the upper bearing 8 and at its upper end by the upper surface 51b of the outer member 51 which is in pressure contact with the supporting portion 56, and a gap is formed between the inner member 52 and the upper bearing 8. 57 is installed. The inner member 52 is made of an elastic material, and in particular, the valve plate 55 is elastically deformed and bent based on the pressure difference between the inside and the outside of the discharge muffler during liquid compression, and the discharge muffler is opened and closed. The predetermined pressure for opening and closing the discharge muffler is appropriately selected according to the breaking strength that depends on the material of the material forming the muffler, the wall thickness, and the like. In this example, the valve member is provided on the inner member of the cover, but it may be provided on the upper surface or the outer peripheral surface of the outer member, and the shape and the number thereof are not limited.

FIG. 8 is a side view of a fourth embodiment of the discharge muffler of the present invention, and FIG. 9 is a sectional view taken along line BB of FIG. In the figure, 8 is an upper bearing, 60 is a cover of the discharge muffler fixed to the bearing, 61 (a portion surrounded by a chain line in FIG. 8) is an opening provided on a side surface of the cover, and 62 is the same opening. A leaf spring for closing the portion, 63 is a fixing means for fixing the leaf spring to the cover 60, and 64 is a stopper fixed to the leaf spring 62 so that both ends thereof hang on the inner edge of the opening. The fixing means may be caulking, welding, or anything. Also, the stopper allows circumferential displacement of the tip of the leaf spring,
The displacement in the radial direction is regulated.

In this apparatus, when the pressure in the discharge muffler is normal, although not shown, the gas is discharged from a gas discharge hole on the upper surface of the cover or an annular discharge hole between the inner peripheral edge of the cover and the upper bearing. It When the pressure inside the discharge muffler becomes high due to liquid compression or the like, the leaf spring 62 bends outward, and a gap is created between the opening 61 and the leaf spring 62, and high pressure is released from there. This can prevent damage to the discharge muffler.

FIG. 10 is a sectional view of another example of the stopper of the above embodiment. In this example, the structure of the main part such as the cover is the same as that of FIG. 8, but FIG.
0, the only difference is that the stopper 65 is attached to the cover 60. The stopper of this example also permits circumferential displacement of the end portion of the leaf spring 62, but has the same action as the stopper 64 described with reference to FIG. 9 in that radial displacement is restricted.

FIG. 11 is a vertical sectional view of a fifth embodiment of the discharge muffler of the present invention. In the figure, 8 is an upper bearing, 8d is a notch provided in the upper bearing, 70 is a cover of the elastically deformable discharge muffler, 71 is an inner edge portion of the upper surface of the cover, 72 is the inner edge portion and the upper bearing. This is a gap formed between the notch 8d and the notch 8d.

In this apparatus, the gas is discharged from the gap 72 at normal pressure. When a high pressure is generated in the muffler due to liquid compression or the like, the cover 70 is bent in the direction of the arrow 73, the gap 72 is enlarged, and the high pressure is released from there. Therefore, damage to the discharge muffler can be prevented.

In the embodiments of the various discharge mufflers detailed above, the discharge muffler is provided in the upper bearing, but when the discharge port is provided in the lower bearing, the discharge muffler is in the lower part. It is installed in the bearing.

[0022]

In the discharge muffler of the compressor of the present invention, the muffler is discharged by releasing abnormal pressure due to movement of the cover itself due to abnormal pressure rise in the muffler or deformation of the elastic member constituting the cover. Since the portion is provided, even if a high pressure is generated in the discharge muffler, it is possible to prevent the cover from being damaged or falling off.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of a discharge muffler of the present invention.

FIG. 2 is a plan view of the muffler.

FIG. 3 is a vertical sectional view of a second embodiment of the discharge muffler of the present invention.

FIG. 4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a perspective view of an inner member of the discharge muffler.

FIG. 6 is a longitudinal sectional view of a third embodiment of the discharge muffler of the present invention.

FIG. 7 is a perspective view of an inner member of the discharge muffler.

FIG. 8 is a side view of a fourth embodiment of the discharge muffler of the present invention.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is a sectional view showing another example of the stopper in the above embodiment.

FIG. 11 is a vertical cross-sectional view of a fifth embodiment of the discharge muffler of the present invention.

FIG. 12 is a vertical sectional view of a conventional rolling piston type rotary compressor.

FIG. 13 is a cross-sectional view of a compression mechanism section of the compressor.

FIG. 14 is a vertical sectional view of a discharge muffler of the compressor.

FIG. 15 is a plan view of the discharge muffler.

[Explanation of symbols]

 1 Housing 2 Motor 2a Motor Stator 2b Motor Rotor 3 Compression Mechanism Part 4 Shaft 5 Crankpin 6 Rotor 7 Cylinder 8 Upper Bearing 8a Boss 8b Straight Part 8c Tapered Part 8d Notch 9 Lower Bearing 10 Blade 11 Suction Chamber 12 Suction Pipe 13 Discharge muffler 14 Compression chamber 15 Discharge port notch 16 Discharge pipe 17 Spring 18 Blade groove 19 Discharge port 20 Discharge valve 21 Cover 22 Mounting bolt 23 Annular gap 30 Cover 31 Mounting bolt 32 Spring 33 Annular gap 40 Cover 41 Outer member 41a Outer peripheral surface 41b Upper surface 42 Inner member 43 Gas discharge hole 44 Overlapping portion 45 Bolt insertion hole 46 Bolt 47 Gap 50 Cover 51 Outer member 51a Outer peripheral surface 51b Upper surface 52 Inner member 53 Gas discharge hole 54 Slit 55 Valve plate 56 Support part 57 Gap 60 Cover 61 Opening 62 Leaf spring 63 Fixing means 64 Stopper 65 Stopper 70 Cover 71 Inner edge of cover 72 Gap 73 Deflection direction

Front page continuation (72) Inventor Norimasa Nishiura 3-1-1 Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Mitsubishi Heavy Industries, Ltd. Air-conditioner factory (72) Norimasa Oya No. 1 Takamichi, Iwatsuka-cho, Nakamura-ku, Nagoya Mitsubishi Heavy Industries, Ltd. Nagoya Research Institute (72) Inventor Tetsuo Shigeoka, No. 1 Takamichi, Iwatsuka-cho, Nakamura-ku, Nagoya City Mitsubishi Heavy Industries, Ltd. Nagoya Research Institute (72) Inventor, Yuji Maeda Iwazuka-cho, Nakamura-ku, Nagoya, Aichi Prefecture 1 at Chubishi Engineering Co., Ltd. at 60, Kutokoro (72) Inventor Yukio Yoshida 1 at Chubishi Engineering Co., Ltd. at Kutani, 60, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Aichi

Claims (6)

[Claims] 1. A discharge muffler is formed by a bearing member that closes an open end of a cylinder to form a compression chamber and a cover attached to the member, and a gas compressed in the compression chamber is passed through the discharge muffler. In the discharge muffler of the compressor that discharges,
A discharge muffler for a compressor, wherein the muffler is provided with a discharge portion that discharges an abnormal pressure by moving the cover itself or deforming an elastic member forming the cover due to an abnormal pressure rise in the muffler. 2. A discharge muffler is formed by a bearing member that closes an opening end of a cylinder to form a compression chamber and a cover attached to the member, and a gas compressed in the compression chamber is passed through the discharge muffler. In the discharge muffler of the compressor that discharges,
A discharge muffler for a compressor, wherein the cover is movable along a mounting bolt, and a spring is provided to press the mounting surface of the cover against the cover mounting surface of the bearing member. 3. A discharge muffler is formed by a bearing member that closes an open end of a cylinder to form a compression chamber and a cover attached to the member, and a gas compressed in the compression chamber is passed through the discharge muffler. In the discharge muffler of the compressor that discharges,
An outer member fixed to the bearing member, which is composed of an end surface having a sufficient gap with respect to the outer diameter of the shaft portion of the bearing member and an outer peripheral surface continuing to the outer peripheral edge of the end surface, and both ends of the band-shaped elastic member are overlapped with each other. And an inner member which is formed in a substantially cylindrical shape and one edge of which is in contact with the inner edge of the end surface of the outer member, and the inner member is fixed so that it can be wound and restored by the pressure difference between the inner and outer sides of the discharge muffler. The discharge muffler of the compressor, which is characterized in that 4. A discharge muffler is formed by a bearing member that closes an open end of a cylinder to form a compression chamber and a cover attached to the member, and the gas compressed in the compression chamber is passed through the discharge muffler. In the discharge muffler of the compressor that discharges,
A discharge muffler for a compressor, wherein the cover is provided with a valve plate portion that is elastically deformed and opened / closed based on a pressure difference between the inside and outside of the discharge muffler. 5. A discharge muffler is formed by a bearing member that closes an opening end of a cylinder to form a compression chamber and a cover attached to the member, and the gas compressed in the compression chamber is passed through the discharge muffler. In the discharge muffler of the compressor that discharges,
An opening is provided on the side surface of the cover, and the opening is covered and closed by a leaf spring having one end fixed to the cover and the other end movably held along the side surface of the cover. A discharge muffler of a compressor, wherein the leaf spring is deformed by the difference to open the closing portion. 6. A discharge muffler is formed by a bearing member that closes an open end of a cylinder to form a compression chamber and a cover attached to the member, and the gas compressed in the compression chamber is passed through the discharge muffler. In the discharge muffler of the compressor that discharges,
A cutout is provided in the bearing member, the cover is made of an elastically deformable material, and the cover is installed so that the inner edge of the cover is adjacent to the cutout. A discharge muffler for a compressor, characterized in that the flow passage cross-sectional area is increased by the notch when the pipe is deformed.