JPH0426714Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a seal structure for a rotary compressor, and in particular, the invention relates to a seal structure for a rotary compressor, and in particular, a seal structure for sealing a rotary compressor. The present invention relates to a seal structure for a rotary compressor that can prevent leakage of high-pressure fluid in a space and avoid a decrease in compression capacity.

[Conventional technology]

A so-called rolling piston type rotary compressor used in vehicle air conditioning compressors, etc. rotates a rolling piston built into a cylinder eccentrically while contacting the inner peripheral surface of the cylinder and a vane that can be retracted into the cylinder. A working chamber for sucking and pressurizing refrigerant gas, which is a fluid, is defined in the cylinder, and a discharge space for refrigerant gas, which is pressurized from the working chamber, is formed in a shell surrounding the cylinder. Publication No. 59-231191). This rotary compressor is
In order to seal each side of the rolling piston and the vane, an annular pressure guiding groove communicating with the discharge space is provided on the cylinder side side of the housing attached to each side of the cylinder, and the pressure is introduced through the pressure guiding groove. A side seal body, which is deformed to seal each side of the rolling piston and vane by high-pressure fluid in the discharge space, is sandwiched between the cylinder and each housing.

[Problem that the invention attempts to solve]

By the way, in the rotary compressor, the fifth
As shown in Figures 7 to 7, a side surface 18a on the cylinder side of one housing, for example, the front housing 18, is deformed to seal the side surfaces 8a, 16a of the eccentrically rotating rolling piston 8 and the reciprocating vane 16. The side seal body 58 is provided with the annular pressure guiding groove 54 that causes the high pressure fluid in the discharge space 44 to act, and the suction passage 3 of the cylinder 4 is provided.
A suction groove 62 communicating with 4 is provided. A pressure guiding groove 54 provided on the side surface 18a of this front housing 18
In order to seal between the front housing 18 and the suction groove 62, a groove seal 64 is sandwiched between the front housing 18 and the side seal 58, as shown in FIG. This inter-groove seal body 64 has a fifth
As shown in the figure, a plurality of small holes 70 are arranged along the pressure guiding groove 54 so that the high pressure fluid introduced into the pressure guiding groove 54 acts on the side seal body 58 side. Note that the reference numeral 68 indicates the pressure guiding groove 54 and the discharge space 44.
This is a communication groove that communicates with the

As a result, the high pressure fluid acting on the gap between the side seal body 58 and the groove seal body 64 when the rolling piston 8 and the side surfaces 8a, 16a of the vane 16 are deformed to seal each other, as shown in FIG. The inter-groove seal body 64 is pressed against the side surface 18a side of the front housing 18, and the pressure guiding groove 54 and the suction groove 62 are
It acts as a seal between the two.

However, conventionally, since the groove face seal body 64 is in contact with almost the entire surface of the deformable portion of the side seal body 58, as shown in FIG. Along with this, the groove seal body 64 also deforms and the side surface 18a of the front housing 18
This caused the problem that the seal between the pressure guiding groove 54 and the suction groove 62 was damaged. As a result, high-pressure fluid leaks from the pressure guiding groove 54 to the suction groove 62, damaging the seals of the cylinder 4, rolling piston 8, and vane 16, resulting in a disadvantage that the performance of the compressor is reduced.

[Purpose of invention]

Therefore, the purpose of this invention was to create a rotating type that can prevent leakage of high-pressure fluid in the discharge space from the pressure guiding groove formed in one housing attached to the side of the cylinder to the suction groove, and avoid a decrease in compression capacity. The goal is to realize a seal structure for compressors.

[Means for solving problems]

In order to achieve this purpose, this device forms a working chamber that sucks and pressurizes fluid into the cylinder by a rolling piston that is rotated eccentrically while being in contact with the inner circumferential surface of the cylinder and a vane that can be retracted into the cylinder. In addition, in a rotary compressor in which a discharge space for the fluid to be pumped from the working chamber is formed in a shell enclosing the cylinder, the discharge space is provided on the cylinder-side side of each housing attached to each side of the cylinder. Annular pressure guiding grooves communicating with the spaces are provided, and a suction groove communicating with the suction passage of the cylinder is provided on the side surface of one housing on the cylinder side, so that high pressure in the discharge space introduced through each of the pressure guiding grooves is provided. A side seal body that is deformed by fluid to seal each side of the rolling piston and the vane is sandwiched between the cylinder and each of the housings, and a pressure guiding groove and a suction groove are formed in the side surface of the one housing. A groove seal body is sandwiched between the first housing and the side seal body to provide a seal between the housing and the side seal body, and the groove seal body is provided with a cutout portion surrounding the annular pressure guiding groove. Features.

[Effect]

According to the structure of this invention, the groove seal body sandwiched between the housing and the side seal body is provided with a cutout portion surrounding the annular pressure guiding groove, and the gap between the deformable portion of the side seal body and the groove is provided. By reducing the contact area with the seal body, deformation of the side seal body does not affect the inter-groove seal body, thereby ensuring a seal between the pressure guiding groove and the suction groove.

〔Example〕

Embodiments of this invention will be described in detail below based on the drawings.

1 to 4 show examples of this invention. In FIGS. 3 and 4, 2 is a so-called rolling piston rotary compressor (hereinafter simply referred to as a compressor) used, for example, in a vehicle air conditioning compressor. This compressor 2 has a cylinder 4 and
A crankshaft 6, a rolling piston 8 mounted on the crankshaft 6 and provided inside the cylinder 4, and a vane spring 14 for bringing the tip 12 into contact with the outer peripheral surface 10 of the rolling piston 8.
The vane 16 is biased by a vane 16 and is provided so as to be able to protrude and retract into the cylinder 4.

A front housing 18 and a rear housing 20 are attached to each axial side surface 4a, 4b of the cylinder 4, respectively. The crankshaft 6 is rotatably supported in the cylinder 4 by penetrating these front and rear housings 18 and 20, and
An electromagnetic clutch mechanism 22 is provided at the outer end of the front housing 18 side for intermittent rotational force transmission, and the cylinder 4 is covered from the rear housing side 20 by a shell 24 serving as an envelope.

Thereby, the compressor 2 drives the crankshaft 6 to eccentrically rotate the outer circumferential surface 10 of the rolling piston 8 while contacting the inner circumferential surface 26 of the cylinder 4 and the tip 12 of the vane 16. For example, a working chamber 28 for sucking and pressurizing refrigerant gas is defined within the cylinder 4.

This working chamber 28 includes an inlet 30 and an outlet 32.
and is provided. The refrigerant gas sucked into the working chamber 28 from the suction passage 34 through the suction port 30 is
It is supplied from a suction port 38 of a suction section 36 provided in the front housing 18 through a suction groove 62, which will be described later.
Further, the refrigerant gas pressure-fed from the discharge port 32 is discharged into the discharge space 44 in the shell 24 through the discharge passage 42 via the discharge valve 40 . The refrigerant gas discharged into this discharge space 44 is
It is supplied to a desired site from a discharge port 48 of a discharge section 46 provided in the. Note that the reference numeral 50 is a wire mesh-like demister for separating lubricating oil from the refrigerant gas, and 52 is a lubricating oil reservoir provided at the lower part of the discharge space 44 .

Each side surface 8a, 8b, 16 of the eccentrically rotating rolling piston 8 and the reciprocating vane 16
cylinder-side sides 18a, 20b of the front and rear housings 18, 20 attached to each side 4a, 4b of the cylinder 4 to seal the cylinders 4a, 16b;
an annular pressure guiding groove 5 communicating with the discharge space 44;
4 and 56, respectively, and each side surface 8 of the rolling piston 8 and the vane 16 is
Side seal bodies 58, 60 that are deformed to seal the cylinders 4, 8b, 16a, 16b are sandwiched between the cylinder 4 and the front and rear housings 18, 20, respectively.

Further, on the cylinder-side side surface 18a of one housing, for example, the front housing 18, there is a side seal body 58 that is deformed to seal the side surfaces 8a, 16a of the eccentrically rotating rolling piston 8 and the reciprocatingly moving vane 16. The annular pressure guiding groove 54 for applying the high pressure fluid in the discharge space 44 is provided, and a suction groove 62 communicating with the suction passage 34 of the cylinder 4 is provided. This front housing 1
The pressure guiding groove 54 and the suction groove 62 provided on the side surface 18a of 8
As shown in FIGS. 1 and 2, a groove seal member 64 is sandwiched between the front housing 18 and the side seal member 58 in order to provide a seal between the front housing 18 and the side seal member 58. and,
As shown in FIG. 1, this groove seal body 64 includes:
A cutout 66 is provided to surround the annular pressure guiding groove 54 so that the high pressure fluid introduced into the pressure guiding groove 54 acts on the side seal body 58 side. In addition,
Reference numeral 68 is a communication groove that communicates the pressure guiding groove 54 with the discharge space 44 .

By the way, conventionally, since the groove seal body 64 is in contact with substantially the entire surface of the deformable portion of the side seal body 58, the groove seal body 64 also deforms as the side seal body 58 deforms, causing the front housing 18 to deform. side 1
8a, causing a problem that the seal between the pressure guiding groove 54 and the suction groove 62 is compromised, resulting in high pressure fluid leaking from the pressure guiding groove 54 to the suction groove 62, causing the cylinder 4, rolling piston 8 and Vane 16
The seal was damaged and the compressor performance was reduced.

However, as described above, in the present invention, the groove seal body 64 sandwiched between the front housing 18 and the side seal body 58 is provided with a cutout portion 66 that surrounds the annular pressure guiding groove 54, and the side seal body 58 is Since the contact surface between the deformable portion and the groove seal body 64 is made small, the deformation of the side seal body 58 does not affect the groove seal body 64. This results in
A seal between the pressure guiding groove 54 and the suction groove 62 can be ensured.

Therefore, the discharge space 4 introduced into the pressure guiding groove 54
4 can be prevented from leaking into the suction groove 62, and the sealing of the cylinder 4, rolling piston 8, and vane 16 can be ensured, and a decrease in the performance of the compressor 2 can be prevented. .

[Effect of idea]

As explained in detail above, according to this invention, the inter-groove seal body sandwiched between one housing and the side seal body is provided with a cutout portion surrounding the annular pressure guiding groove, and the side seal body is deformed. By reducing the contact area between the part and the groove seal body, the deformation of the side seal body is not affected by the groove seal body, thereby ensuring a seal between the pressure guiding groove and the suction groove. There is.

Therefore, leakage of high-pressure fluid from the pressure guiding groove to the suction groove can be prevented, the sealing of the cylinder, rolling piston, and vane can be ensured, and a decrease in the performance of the compressor can be avoided.

[Brief explanation of the drawing]

Figures 1 to 4 show examples of this invention. Figure 1 is a schematic configuration diagram of the seal structure, Figure 2 is a sectional view of the main part in a sealed state, and Figure 3 is a rolling piston type rotary compressor. FIG. 4 is an internal end view of a rolling piston type rotary compressor. 5 to 7 show conventional examples, FIG. 5 is a schematic diagram of the seal structure, FIG. 6 is a sectional view of a main part in a sealed state, and FIG. 7 is a sectional view of a main part in a leaking state. In the figure, 2 is a rolling piston type rotary compressor, 4 is a cylinder, 6 is a crankshaft, and 8 is a rotary compressor.
1 is a rolling piston, 10 is an outer peripheral surface, 16 is a vane, 18 is a front housing, 20 is a rear housing, 24 is a shell, 26 is an inner peripheral surface, 28 is a working chamber, 30 is an inlet port, 32 is a discharge port, 34 40 is a suction passage, 40 is a discharge valve, 42 is a discharge passage, 44 is a discharge space, 54, 56 are pressure guiding grooves, 58, 60 are side seal bodies, 62 is a suction groove, 64 is an inter-groove seal body, 6
6 is a cutout, and 68 is a communication groove.

Claims (1)

[Scope of utility model registration request] A rolling piston that rotates eccentrically while being in contact with the inner circumferential surface of the cylinder and a vane that can be retracted into the cylinder defines a working chamber that sucks and pressure-feeds fluid into the cylinder, and also forms a working chamber in a shell that encloses the cylinder. In the rotary compressor forming a discharge space for the fluid to be pumped from the working chamber, each housing attached to each side of the cylinder has an annular pressure guiding groove communicating with the discharge space on the cylinder side side. In addition, a suction groove communicating with the suction passage of the cylinder is provided on the side surface of the cylinder side of one housing, and each side surface of the rolling piston and vane is A side seal body that is deformed for sealing is sandwiched between the cylinder and each of the housings, and the one housing is configured to seal between a pressure guiding groove and a suction groove formed on the side surface of the one housing. A seal structure for a rotary compressor, characterized in that a groove seal body is sandwiched between the groove seal body and the side seal body, and the groove seal body is provided with a cutout portion surrounding the annular pressure guiding groove.