JP3336721B2 - Rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor in which a compression element comprising a cylinder, a front head and a rear head is housed in a closed casing, and a muffler is mounted on the rear head.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 2-267389.
As shown in the publication, a compression element comprising a cylinder, a front head and a rear head having a cylinder, a compression head and a motor having a drive shaft on the other side are provided on one side in the longitudinal direction of a horizontal sealed casing having an oil reservoir at the bottom. A muffler is fitted to the rear head disposed on the side opposite to the motor, and the compression element is driven by the rotation of the drive shaft, and the gas compressed by the compression element is once discharged into the muffler. After that, a horizontal rotary compressor that discharges into the casing is known.

In this rotary compressor, as shown in FIG. 5, a cylindrical bearing cylinder B1 for bearing and supporting a drive shaft D is formed on a rear head B of a compression element A.
A muffler C having a cylindrical portion C1 fitted to the bearing cylinder B1 of the rear head B is attached to the rear head B. Further, a cylindrical inner surface corner C2 of the cylindrical portion C1 of the muffler C and the rear head B bearing cylinder B1
O-ring E between the conical portion B2 formed at the axial end of
To seal. This sealing is performed by pressing the O-ring E between the conical portion B2 and the cylindrical inner surface corner portion C2. An oil supply pump F is provided at an end of the drive shaft D on the rear head B side.

[0004] Then, with the seal using the O-ring E,
The high-pressure gas in the muffler C is prevented from flowing into the oil supply pump F, and the pumping capacity of the oil pumped from the oil reservoir by the oil supply pump F is prevented from being reduced.

[0005]

However, in the conventional rotary compressor described above, as shown in FIG. 5, the above-mentioned rotary compressor for sealing between the muffler C and the end surface of the bearing cylinder B1 of the rear head B is used. The O-ring E is compressed in a state surrounded by the conical portion B2 of the bearing cylinder B1 and the cylindrical inner surface corner C2 of the muffler C, and is compressed by being tightened from three sides. There was a problem that the deformation rate due to the compression of the ring E was increased, and the durability was deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the deformation rate of the O-ring by tightening the O-ring in two directions, improve the durability, and improve the sealing performance. It is an object of the present invention to provide a rotary compressor that can improve the O-ring easily, can easily position the O-ring, and can improve the assembling property.

[0007]

In order to achieve the above object, the present invention provides a closed casing 1 in which a cylinder 31 is provided.
In a rotary compressor in which a compression element 3 including a front head 32 and a rear head 33 having bearing cylinders 32a and 33a is installed, and a muffler 6 is attached to the rear head 33 , a cylinder portion 62 is provided on the muffler 6, An O-ring 8 is disposed on the outer periphery of the cylindrical portion 62, and the O-ring 8 is pressed against the end surface of the bearing cylinder 33 a and the inner surface of the muffler 6 around the cylindrical portion 62 when the muffler 6 is attached. It is.

Further, the inner diameter of the pre-Symbol O-ring 8, as the tube outer diameter or less under the muffler 6, than it was holding the O-ring 8 to the outer periphery of the tubular portion 62.

Furthermore, the pre-Symbol O-ring 8, the end surfaces of the bushing 33a of the rear head 33, a seal portion 81 for crimping to the inner surface of the surrounding cylindrical portion 62 of the muffler 6, radially inside from the seal portion 81 Extending towards
A holding portion 82 having an inner diameter smaller than the outer diameter of the cylindrical portion 62 is formed, and the holding portion 82 is held on the outer periphery of the cylindrical portion 62 of the muffler 6.

[0010]

SUMMARY OF] In this invention, the muffler 6, provided with a cylindrical portion 62, the outer periphery of the cylindrical portion 62, is disposed an O-ring 8,
When the muffler 6 is attached to the muffler 6, the O-ring 8 is brought into pressure contact with the end surface of the bearing cylinder 33 a and the inner surface of the muffler 6 around the cylindrical portion, so that when attaching the muffler 6 to the bearing cylinder 33 a of the rear head 33, Since the O-ring 8 is located on the outer peripheral side of the cylindrical portion 62 of the muffler 6, the displacement of the O-ring 8 is limited by the cylindrical portion 62, and the O-ring 8 is attached to the end surface of the bearing cylinder 33a. Since the O-ring 8 can be securely positioned, the O-ring 8 can be reliably sealed, and the assemblability can be improved. Further, the O-ring 8 is attached to the bushing 3.
The end face 3a and the inner surface of the muffler 6 can be pressed only from two directions.
The ring 8 is elastically deformed only in two directions, that is, the inner surface side and the outer surface side of the O-ring 8 which are perpendicular to the direction of pressing. Therefore, the O-ring 8 is forcibly compressed,
Since the deformation rate can be prevented from increasing, the durability of the O-ring 8 can be improved as compared with the conventional seal using the O-ring.

Further, the inner diameter of the pre-Symbol O-ring 8, as the tube outer diameter or less under the muffler 6, wherein because the O-ring 8 is held by the outer periphery of the tubular portion 62, the O wherein a ring 8 bearing sleeve 33a When assembling between the end surface of the muffler 6 and the inner surface of the muffler 6, the O-ring 8 is attached to the cylindrical portion 6 of the muffler 6.
Since the muffler 6 can be assembled to the rear head 33 in a state where the muffler 6 is held on the outer surface of the muffler 6, the O-ring 8 can be held in the cylindrical portion 62 of the muffler 6. Therefore, during operation, even if a pressing force due to a pressure difference between the gas pressure in the muffler 6 and the gas pressure in the casing 1 acts, the displacement of the O-ring 8 can be reliably prevented and the O-ring 8 can be prevented from being displaced. Elastic deformation can also be prevented, and the O-ring 8 can be more reliably positioned at the end surface of the bearing cylinder 33a. Therefore, the durability can be further improved, and the sealing with the O-ring 8 can be performed more reliably.

Furthermore, the pre-Symbol O-ring 8, and the end face of the bushing 33a of the rear head 33, a seal portion 81 for crimping to the inner surface around the cylindrical portion of the muffler 6, radially inward from the seal portion 81 And a holding portion 82 having an inner diameter equal to or less than the outer diameter of the cylindrical portion 62, and the holding portion 82 is held on the outer periphery of the cylindrical portion 62 of the muffler 6. Since the holding portion 82 is held on the outer periphery of the cylindrical portion 62 of the muffler 6 irrespective of 81, the holding portion 82 need only consider the holding effect without considering the sealing effect.
When the O-ring 8 is held by the tubular portion 62 of the muffler 6, the O-ring 8 can be easily attached to the tubular portion 62 without requiring excessive force. The assembly can be performed satisfactorily. In addition, the O
When the ring 8 is assembled to the cylindrical portion 62, the holding portion 82 is pressed against the cylindrical portion 62 to be held. Therefore, when the seal portion 81 is elastically deformed by being tightened in two directions, With the elastic deformation of the seal portion 82, the holding portion 82 is also elastically deformed inward in the radial direction, so that the holding portion 82 can be further pressed against the cylindrical portion 82. Thus, the sealing effect by the elastic deformation of the holding portion 82 can be expected while improving the durability of the holding portion 82.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

The first embodiment shown in FIG. 2 is a horizontal hermetic rotary compressor in which a motor 2 is disposed on one side in the longitudinal direction of a closed casing 1 and a compression element 3 is disposed on the other side in the longitudinal direction. The casing 1 is provided with an oil reservoir 1a at the bottom.

The motor 2 comprises a stator 21 fixed to the casing 1 and a rotor 22 rotatably disposed inside the stator 21 and having a drive shaft 4. Cylinder 31, front head 32 and rear head 3 that sandwich cylinder 31
3 and bearing cylinders 32a, 33a formed in the front head 32 and the rear head 33.
The bearing is supported.

On the other hand, the eccentric portion 41 of the drive shaft 4 is inserted into a roller 34 interposed in the cylinder 31,
The rotation of the roller 34 caused by the rotation of the motor 2 compresses the gas refrigerant sucked into the cylinder 31 from the suction pipe 11 connected to the cylinder 31, and compresses the compressed gas refrigerant into the front head. The nozzles 32 and the rear head 33 discharge from respective discharge holes (not shown) to discharge chambers 51 and 61 formed by mufflers 5 and 6 that cover the end surfaces of the heads 32 and 33, respectively. The fluid is discharged into the casing 1 through a discharge pipe 6 and discharged to the outside of the casing from a discharge pipe 12 connected to an upper portion of the casing 1.

The discharge gas discharged into the discharge chamber 61 in the muffler 6 on the rear head side is discharged from the discharge head 61 on the front head side by a through hole (not shown) passing through the rear head 33, the cylinder 31, and the front head 32. The mufflers 5 and 6 are fixed by tightening bolts 7.

Further, an oil supply passage 42 extending in the axial direction extends through the drive shaft 4, and an oil pumping pipe 4 having one end opened to the oil reservoir 1a at one end of the oil supply passage 42 opposite to the motor.
3 and a pump plate 24 is disposed on the end face of the end ring 23 on the side opposite to the compression element of the rotor 22, and the rotation of the pump plate 24 accompanying the rotation of the rotor 22 causes the oil pumping pipe 43 to rotate. It constitutes a centrifugal pump for pumping oil from the oil reservoir 1a.

Thus, in the above hermetic compressor,
In the embodiment shown in FIG. 1 and FIG.
A muffler 6 attached to the rear head 33 is provided with a cylindrical portion 62 which can be inserted into the bearing cylinder 33a of the rear head 33, and an O-ring 8 is held around the outer periphery of the cylindrical portion 62. When the bolt 7 is attached by tightening, the O-ring 8 is brought into pressure contact with the end surface of the bearing cylinder 33a and the inner surface of the muffler 6 around the cylindrical portion 62.

More specifically, as shown in FIG. 1, the central portion of the muffler 6 projects toward the rear head 33 into a cylindrical shape having an outer diameter smaller than the inner diameter of a bearing cylinder 33a of the rear head 33. Further, the distal end side of the protruding portion is formed in a cylindrical shape having an outer diameter smaller than the inner diameter of the oil supply passage 42 of the drive shaft 4, thereby forming a stepped cylindrical portion 62.

The small-diameter portion 62 of the cylindrical portion 62
When the muffler 6 is attached to the rear head 33, the small diameter portion 62b is inserted so as not to contact the inside of the oil supply passage 42 when the muffler 6 is attached to the rear head 33.

Further, the O-ring 8 has a seal portion 81 having a circular cross section which is pressed against the end surface of the bearing tube 33a of the rear head 33 and the inner surface of the muffler 6 around the tube portion 62. It has an inner diameter that is smaller than the outer diameter of the large-diameter portion 62a of the cylindrical portion 62 of the muffler 6 and extends inward from the center in the thickness direction on the inner surface side, and is thinner than the thickness of the seal portion 81. A lip-shaped holding portion 82 is formed, and the holding portion 82 is pressed against and held on the outer periphery of the large-diameter portion 62 a in the cylindrical portion 62 of the muffler 6. The O-ring 8 is
It is preferable to use a fluororesin having heat resistance and excellent refrigerant resistance, but other elastic materials may be used.

In order to interpose the O-ring 8 described above between the muffler 6 and the end face of the bearing cylinder 33a, first, the O-ring 8 must be connected to the cylindrical portion 62 of the muffler 6.
The holding portion 82 of the O-ring 8 is pressed against and held by the large-diameter portion 62 a of the cylindrical portion 62 of the muffler 6, and in this held state, the muffler 6 is attached to the rear head 33. The O-ring 8 is pressed into contact with the end surface of the bearing cylinder 33a and the inner surface of the muffler 6 around the cylindrical portion 62, and the gas in the muffler 6 is released by the O-ring 8. The sealing is performed so as not to flow into the oil supply passage 42 of the drive shaft 4.

Since the O-ring 8 can be assembled while being held on the large-diameter portion 62a of the cylindrical portion 62 of the muffler 6 via the holding portion 82, the assembly can be easily performed. After the assembly, since the O-ring 8 is held by the large-diameter portion 62a, the displacement can be prevented, and the O-ring 8 can be reliably positioned on the end face of the bearing cylinder 33a. Therefore, the sealing by the O-ring 8 can be reliably performed.

Further, the O-ring 8 is connected to the bearing cylinder 3
The end face 3a and the inner surface of the muffler 6 can be pressed only from two directions.
The ring 8 is elastically deformed only in two directions, that is, the inner surface side and the outer surface side of the O-ring 8 which are perpendicular to the direction of pressing. Therefore, the O-ring 8 is forcibly compressed,
Since the deformation rate can be prevented from increasing, the durability of the O-ring 8 can be improved as compared with the conventional seal using the O-ring.

Further, in the first embodiment, a seal portion 81 for pressing the O-ring 8 against the end surface of the bearing tube 33a of the rear head 33 and an inner surface around the cylindrical portion of the muffler 6; And a holding portion 82 having an inner diameter less than or equal to the outer diameter of the cylindrical portion 62, and the holding portion 82 is simply formed without considering the sealing effect. Because it has a thickness that has a holding force that simply considers only the holding effect,
The mounting of the holding portion 82 to the cylindrical portion 62 can be easily performed without requiring excessive force.

When the O-ring 8 is attached to the cylindrical portion 62, the holding portion 82 is pressed against the cylindrical portion 62 to be held, so that the seal portion 81 is tightened in two directions. When elastically deformed, the holding portion 82 is also elastically deformed inward in the radial direction with the elastic deformation of the seal portion 82 in two radial directions. Therefore, the O-ring 8 can be assembled well, the durability can be improved, and a sealing effect by the elastic deformation of the holding portion 82 can be expected.

In the first embodiment, the O-ring 8
Is composed of the seal portion 81 and the holding portion 82 formed on the inner surface side of the seal portion 81, but may have a circular cross section. In this case, by making the inner diameter of the O-ring 8 smaller than the outer diameter of the cylindrical portion 62 of the muffler 6, the O-ring 8 can be held by the cylindrical portion 62. The outer diameter of the cylindrical portion 62 may be larger than that of the cylindrical portion 62 and may not be held by the cylindrical portion 62 even when tightened by the bolt 7. As described above, the O-ring does not need to be held by the tubular portion 62, but the tubular portion 62 can limit the displacement of the O-ring 8 when the O-ring 8 is positioned on the end surface of the bearing barrel 33a. It is preferred that By doing so, the sealing at the end face of the bearing cylinder 33a can be reliably performed, and the deterioration of the sealing performance can be prevented.

Next, a second embodiment will be described with reference to FIG. In the second embodiment, the cylinder portion 62 is provided by using a pump case 44 attached to an end of a bearing cylinder 33a of the rear head 33. More specifically, an opening is provided in an oil supply passage 42 of the drive shaft 4. The discharge chamber 61 is formed by the opening side peripheral surface of the pump case 44 and the muffler 6 fixed to this peripheral surface.
The O-ring 8 is held by the cylindrical portion 62 formed by the outer peripheral surface of the pump case 44.

That is, a hole 63 having a diameter that can be inserted into the outer peripheral surface of the pump case 44 is formed in the center of the muffler 6.
The hole 63 is inserted into the outer peripheral surface of the pump case 44 and fixed by welding or the like, and the cylindrical portion facing the discharge chamber 61 by the peripheral surface of the pump case 44 on the opening side to the oil supply passage 42. 62, and the cylindrical portion 62 is provided with the O
With the ring 8 inserted and fitted so as to face the inner surface side of the muffler 6, the bolt 7 is tightened while the holding portion 82 of the O-ring 8 is held by the cylindrical portion 62 provided on the pump case 44. Accordingly, the O-ring 8 is pressed against the end surface of the bearing cylinder 33a on the inner surface of the muffler 6, and the pump case 44 is attached to the end of the bearing cylinder 33a.

According to the second embodiment, the pump case 4
4, the muffler 6 can be made to have a simpler structure, but the seal between the muffler 6 and the oil supply passage 42 can be reliably formed by the seal with the O-ring 8. Can be sealed.

The muffler 6 and the O-ring 8 are assembled by attaching the O-ring 8 to the cylinder portion 62 of the pump case 44 after attaching the pump case 44 to the bearing cylinder 33a. Further, after the muffler 6 is inserted into and fixed to the cylindrical portion 62 of the pump case 44, an oil pumping pipe 43 may be connected to the pump case 44.

Next, a third embodiment will be described with reference to FIG. The third embodiment is applied to a vertical rotary compressor. A pump head 45 communicating with an oil supply passage 42 is attached to a lower end of a drive shaft 4 and the pump head 45 is rotated by the drive shaft 4. The oil supply passage 42
The oil in the oil reservoir 1a can be pumped up inside.

In the third embodiment, similar to the first embodiment,
A cylindrical portion 62 is formed integrally with the muffler 6. The cylindrical portion 62 has an outer diameter less than or equal to the inner diameter of the bearing tube 33a of the rear head 33, and an end of the cylindrical portion 62 is formed of the bearing tube 33a. Is formed so as to be located outside of the end face of.

As shown in FIG. 4, the O-ring 8 has a diamond-shaped cross-section and an inner surface whose diameter is smaller than the outer diameter of the cylindrical portion 62. The inner surface of the ring 8 is held on the outer surface of the cylindrical portion 62.

In this case, while the shape of the O-ring 8 can be simplified, when assembling the O-ring 8,
The O-ring 8 can be assembled in a state where the inner side end thereof is held by the cylindrical portion 62, so that the assembly can be performed satisfactorily.

The O-ring 8 can be held by pressing the inner surface thereof against the cylindrical portion 62 of the muffler 6.
During operation, even if a pressing force due to a pressure difference between the gas pressure in the muffler 6 and the gas pressure in the casing 1 acts, the displacement of the O-ring 8 can be reliably prevented, and large elastic deformation can be prevented. Since the O-ring 8 can be prevented and the O-ring 8 can be positioned more reliably at the end face of the bearing cylinder 33a, the sealing with the O-ring 8 can be performed more reliably while the durability can be further improved.

[0038]

As described above, according to the present invention, the cylinder 31, the bearing cylinders 32a, 33a
In a rotary compressor in which a compression element 3 including a front head 32 and a rear head 33 having a muffler 6 is mounted, and a muffler 6 is attached to the rear head 33 , a cylinder portion 62 is provided on the muffler 6, An O-ring 8 is provided, and when the O-ring 8 is attached to the muffler 6, the O-ring 8 is pressed against the end surface of the bearing cylinder 33a and the inner surface of the muffler 6 around the cylindrical portion 62. When the O-ring 8 is attached to the bearing cylinder 33a of the rear head 33, the O-ring 8 is positioned on the outer peripheral side of the cylinder 62 of the muffler 6, so that the O-ring 8 can be prevented from being displaced by the cylinder 62. , The O-ring 8
Can be reliably positioned on the end face of the bearing cylinder 33a, so that the sealing by the O-ring 8 can be reliably performed, and the assembling property can be improved. Further, since the O-ring 8 can be pressed only from two directions by the end surface of the bearing cylinder 33a and the inner surface of the muffler 6, the O-ring 8 is moved in a direction perpendicular to the pressing direction. The O-ring 8 is elastically deformed only in two directions, that is, the inner surface side and the outer surface side. Therefore, the O-ring 8 can be prevented from being forcibly compressed and its deformation rate can be prevented from increasing. The durability of the ring 8 can be improved as compared with the conventional O-ring seal.

Further, the inner diameter of the pre-Symbol O-ring 8, as the tube outer diameter or less under the muffler 6, wherein because the O-ring 8 is held by the outer periphery of the tubular portion 62, the O wherein a ring 8 bearing sleeve 33a When assembling between the end surface of the muffler 6 and the inner surface of the muffler 6, the O-ring 8 is attached to the cylindrical portion 6 of the muffler 6.
Since the muffler 6 can be assembled to the rear head 33 in a state where the muffler 6 is held on the outer surface of the muffler 6, the O-ring 8 can be held in the cylindrical portion 62 of the muffler 6. Therefore, during operation, even if a pressing force due to a pressure difference between the gas pressure in the muffler 6 and the gas pressure in the casing 1 acts, the displacement of the O-ring 8 can be reliably prevented and the O-ring 8 can be prevented from being displaced. Elastic deformation can also be prevented, and the O-ring 8 can be more reliably positioned at the end surface of the bearing cylinder 33a. Therefore, the durability can be further improved, and the sealing with the O-ring 8 can be performed more reliably.

[0040] Furthermore, the pre-Symbol O-ring 8, and the end face of the bushing 33a of the rear head 33, a seal portion 81 for crimping to the inner surface around the cylindrical portion of the muffler 6, radially inward from the seal portion 81 And a holding portion 82 having an inner diameter smaller than or equal to the outer diameter of the cylindrical portion 62, and the holding portion 82 is held on the outer periphery of the cylindrical portion 62 of the muffler 6. Regardless of the portion 81, the muffler 6 is held by the holding portion 82 on the outer periphery of the cylindrical portion 62, and the holding portion 82 does not consider the sealing effect but only considers the holding effect only. When the O-ring 8 is held by the tubular portion 62 of the muffler 6, the O-ring 8 can be easily attached to the tubular portion 62 without requiring excessive force. Good It is to be performed in. In addition, the O
When the ring 8 is assembled to the cylindrical portion 62, the holding portion 82 is pressed against the cylindrical portion 62 to be held. Therefore, when the seal portion 81 is elastically deformed by being tightened in two directions, With the elastic deformation of the seal portion 82, the holding portion 82 is also elastically deformed inward in the radial direction, so that the holding portion 82 can be further pressed against the cylindrical portion 82. Thus, the sealing effect due to the elastic deformation of the holding portion 82 can be expected while improving the durability of the holding member 82.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of a rotary compressor according to the present invention.

FIG. 2 is a sectional view showing the entire rotary compressor of the first embodiment.

FIG. 3 is a sectional view of a main part showing a second embodiment.

FIG. 4 is an essential part cross-sectional view showing a third embodiment.

FIG. 5 is a cross-sectional view showing a conventional muffler seal structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed casing 3 Compression element 31 Cylinder 32 Front head 32a Bearing cylinder 33 Rear head 33a Bearing cylinder 6 Muffler 62 Tube part 8 O-ring 81 Seal part 82 Holding part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-125587 (JP, U) JP-A-2-132892 (JP, U) JP-A 5-17270 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) F04C 27/00 F04C 29/02 F04C 29/06

Claims (1)

(57) [Claims] A cylinder (3) is provided in a closed casing (1).
1) Rotary compression in which a compression element (3) including a front head (32) having a bearing cylinder (32a) (33a) and a rear head (33) is provided, and a muffler (6) is attached to the rear head (33). A cylinder (62) is provided on the muffler (6), and an O-ring (8) is disposed on the outer periphery of the cylinder (62). The O-ring (8) is attached to the muffler (6). when mounting the), the end face of said bushing (33a), and characterized in that it is pressed against to the inner surface around the cylindrical portion of the muffler (6), the inner diameter of the O-ring (8), a muffler ( 6) Outside the cylinder
The O-ring (8) and the cylindrical portion (62)
And the O-ring (8) is attached to the end surface of the bearing cylinder (33a).
A sheet to be crimped to the inner surface around the cylinder in the fuller (6)
(81) and radially inward from the seal (81).
, And not more than the outer diameter of the cylindrical portion (62).
And a holding portion (82) having an inner diameter.
2) is held on the outer periphery of the cylindrical portion (62) of the muffler (6)
Rotary compressor.