JPH0518359A - Silencer of oil-feeding type compressor - Google Patents

Abstract

PURPOSE:To significantly restrain the blowing-out of oil from an oil-feeding type compressor to the outside. CONSTITUTION:In the inside of a housing 24 having a connection 27 to be connected to the suction port of a compressor on its one end, a filter element 29 is arranged so as to be supported by a supporting plate 30. One end of a ventilating pipe 35 which has been liquid-tightly penetrated through the side wall of the housing 24 is extended to the region A between the supporting plate 30 and the bottom of the housing 24, and in the region A, a screening plate 36 is arranged so as to have a space of a specified distance L from the end of the ventilating pipe 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler suitable for use in a refueling type compressor, particularly a refueling type compressor having an unload mechanism.

[0002]

2. Description of the Related Art Usually, a compressor is often equipped with a silencer for reducing intake noise. As this silencer, an extended type is generally used,
For the purpose of removing dust from the intake air, a filter element is arranged inside the housing, and the air taken into the housing is sent to the suction port of the compressor through the filter element.

In a compressor provided with an unload mechanism, the suction valve is opened during air unloading to cause air to flow backward. However, the air flowing back is used to remove the oil in the compressor. Part of it goes into the muffler and its large oil particles are captured by the filter element,
The small oil particles will diffuse through the filter element and into the housing.

[0004]

However, in the conventional silencer, a suction port for taking in air is provided in the housing at a position facing the filter element, and a ventilation pipe attached to this suction port. However, the oil that has passed through the filter element enters the suction pipe directly or along the inner wall of the housing, and the oil around the compressor blows out from the suction pipe. There was a problem of being contaminated.

The present invention has been made to solve the above-mentioned conventional problems, and provides a muffler for a refueling type compressor capable of greatly suppressing the outflow of the oil flowing back from the compressor to the outside. It is in.

[0006]

In order to achieve the above-mentioned object, the present invention provides a housing having a connection opening portion to a suction opening of a compressor at a portion facing the connection opening portion in a housing. The filter element is arranged so as to be supported by a support plate provided to face the inner surface of the one end side, and one end of a ventilation pipe that penetrates the side wall of the housing in a liquid-tight manner is connected to the inner surface of the other end side of the housing and the support plate. It is characterized in that it is configured so as to extend to a region between them, and further, if desired, a shield plate is arranged in a front region of the ventilation pipe in the housing.

[0007]

In the muffler of the oil-filled compressor constructed as described above, the tip of the ventilation pipe is extended to the region between the inner end surface of the housing and the support plate supporting the filter element. The oil that has passed through does not directly enter the ventilation pipe, and the oil that has propagated through the inner wall of the housing does not enter the ventilation pipe. Also, when a shield plate is placed in the front area of the ventilation pipe, fine oil droplets scattered in the housing collide with the shield plate and are captured, so that the outflow of oil to the ventilation pipe is further suppressed. To be

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 3 and 4, reference numeral 1 is a refueling type compressor, and 21 is a silencer attached to the compressor according to the present invention. The compressor 1 includes a cylinder 3 in which a piston 2 is slidably mounted, and a cylinder head 5 integrated with the cylinder 3 via a valve seat plate 4, and the piston 2 is a crank arranged below the cylinder 3. A connecting rod 6 extending from a shaft (not shown) is connected to one end of the connecting rod 6 with a pin 7 so as to perform a reciprocating motion according to the rotation of the crankshaft. The interior of the cylinder head 5 is divided into a suction chamber 8 and a discharge chamber 9 by a partition wall,
The valve seat plate 4 is provided with a suction port 10 which communicates the suction chamber 8 with the inside of the cylinder 3, and a discharge port 11 which communicates with the discharge chamber 9 and the inside of the cylinder 3. Cylinder head 5
Large-diameter screw holes 12a, 12b are provided on the side walls of the suction chamber 8 and the discharge chamber 9, respectively, and the main compressor 21 is connected to one screw hole 12a facing the suction chamber 8.

A suction valve 13 for opening and closing the suction port 10 is provided on the cylinder 3 side of the valve seat plate 4, and a discharge port is provided on the cylinder head 5 side.
Discharge valves 14 for opening and closing 11 are arranged respectively. The suction valve 13 and the discharge valve 14 are formed of leaf springs, and one end of each is fixed to the valve seat plate 4 so that the suction port 10 and the discharge port 11 are normally closed (only the suction valve 13 side is shown here). ) 15
It has been fixed using. On the other hand, an unloading mechanism 16 is arranged on the ceiling portion of the cylinder head 5 corresponding to the suction chamber 8. The unload mechanism 16 includes a piston portion 18 slidably housed in a cylinder portion 17 provided in the cylinder head 5, and a piston portion 18 extending from the piston portion 18 through a ceiling of the piston head 5 to a vicinity of a suction port 10. Flared rod part 19
And a spring 20 that normally biases the piston portion 18 upward. Further, the intake port 17 is provided on the lid 17a of the cylinder portion 17.
b is opened, compressed air is supplied to this intake port during unloading operation, and this air pressure causes the piston portion 18 to move downward against the urging force of the spring 20, and the suction valve 13 at the tip of the rod portion 19 It will be opened.

As shown in detail in FIGS. 1 and 2, the muffler 21 is provided with a housing 24 having a cup-shaped main body 22 and a lid body 23 that covers the opening of the main body portion 22. There is. The main body 22 and the lid body 23 of the housing 24 are fitted together via an O-ring 25, and are detachably connected using a plurality of catches (catches) 26 provided on the peripheral surface of the main body 22. A central hole 22a is formed in the main body 22 of the housing 24, and a connection port portion 27 that can be screwed into the screw hole 12a communicating with the suction chamber 8 of the compressor is attached to the central hole 22a. That is, the muffler 21 is fastened and fixed to the compressor 1 by screwing the connection port portion 27 provided on the housing 24 into the screw hole 12.

On the other hand, in the housing 24, the central hole 22
A filter unit 28 is arranged so as to face a (connection port portion 27). The filter unit 28 is composed of an annular filter element 29 and a support plate 30 joined to one end of the filter element 29, and a bolt 32 is used for a bracket 31 extending from the inner surface of the lid 23 of the housing 24. It is fixed. That is, the nut 33 is previously attached to the bracket 31.
Is fixed by welding or the like, and the filter unit 28
Is fixed by screwing a bolt 32 through which the support plate 30 is inserted into the nut 33. Filter unit 28
Is approximately half the height of the housing 24, and a considerably large space (area) A is secured between the support plate 30 and the bottom surface of the housing 24.

A through hole 34 is formed in one side wall of the housing 24.
The vent pipe 35 is fitted into the through hole 34 in a liquid-tight manner. The vent pipe 34 has its tip extending to a region A between the support plate 30 of the filter unit 28 and the bottom surface of the housing 24. Further, a shielding plate 36 is arranged in the front area of the ventilation pipe 35. The shield plate 36 is erected on the bottom of the housing 24 so as to face the open end of the ventilation pipe 34. A predetermined distance L is set between the opening end of the ventilation pipe 35 and the shield plate 36, which is set from the oil capturing efficiency and the sound deadening characteristic described later.

The operation of the compressor silencer configured as described above will be described below.

During the load operation of the compressor 1, the rod portion 19 of the unload mechanism 16 is raised so that the suction valve 13 can open and close the suction port 10 of the valve seat plate 4. Under this state, when the piston 2 reciprocates in the cylinder 3 due to the rotation of the crankshaft, the suction valve 13
Is opened and the air sent from the muffler 21 is sucked into the cylinder 3 from the suction chamber 8 through the suction port 10 and is compressed by its rise, and the discharge valve 14 is opened when the pressure rises to a predetermined pressure. Valve and compressed air is delivered to the load through screw holes 12b. Then, at the time of intake into the cylinder 3, the silencer 21 side is connected to the housing through the ventilation pipe 35.
Air is introduced into 24, where it expands rapidly and suppresses the generation of intake noise. The air introduced into the housing 24 is sucked into the filter element 29 of the filter unit 28, dust is removed therefrom, and then flows into the suction chamber 8 of the compressor 1 through the connection port portion 27. Since the shielding plate 36 is present in the front region of the ventilation pipe 35, the air introduced from the ventilation pipe 35 into the housing 24 once collides with the shielding plate 36 or the support plate 30, and relatively large dust is generated there. The air that has been separated and removed and that has been introduced into the housing 24 does not hit the filter element 29 locally, so that the dustproof life of the filter element 29 is extended.

On the other hand, during the unloading operation of the compressor 1,
By introducing compressed air into the cylinder portion 17 of the unload mechanism 16, the rod portion 19 thereof descends against the urging force of the spring 20,
The suction valve 13 is opened. As a result, air flows in and out of the cylinder 3 through the suction port 10 in response to the reciprocating motion of the piston 2, and a part of the oil in the cylinder 3 rides on the air that flows backward, and the suction port 10, the suction chamber 8, and the screw hole. It flows into the muffler 21 through 12a and the connection port 27. In the silencer 21, the backflowed oil is sucked into the filter element 29, and at this time, large oil particles are trapped by the filter element 29, but small oil particles pass through the filter element 29 and diffuse into the housing 24. .

However, the tip of the ventilation pipe 35 is attached to the housing 24.
Area A between the bottom surface of the filter unit and the support plate 30 of the filter unit 28
Since the oil has passed through the filter element 29, the oil that has passed through the filter element 29 does not directly enter the ventilation pipe 35, and the oil that has propagated through the inner wall of the housing 24 also does not enter the ventilation pipe. In addition, a shield plate is provided in the front area of the ventilation pipe 35.
Since 36 is arranged, even small oil droplets scattered in the housing 24 partially collide with the shield plate 36 and adhere to the shield plate, and flow down to the bottom of the housing 24. That is, most of the oil that has flowed back into the housing 24 is vent pipe 35.
Does not flow into the vent pipe 35, so that the amount of oil blown out from the ventilation pipe 35 is extremely small, and the surroundings of the compressor 1 are not seriously contaminated with oil.

By the way, if the distance L between the opening end of the ventilation pipe 35 and the shield plate 36 is set too large, the oil capturing efficiency is lowered, and conversely, if it is set too small, the silencing characteristic of the silencer 21 is reduced. Is estimated to deteriorate. Therefore, as a result of testing the influence of the distance L variously on the blowout of oil and the noise value, as shown in FIG. 5, the noise value dB becomes smaller as the distance L becomes smaller than the diameter D of the ventilation pipe 35. However, it has become clear that there is a tendency for the oil pressure to rapidly deteriorate, and that the oil blowout deteriorates when the distance L exceeds twice the diameter D of the ventilation pipe 35. Therefore, in this embodiment, the ventilation pipe is
The distance L between the open end of 35 and the shielding plate 36 is set to be in the range of 1 to 2 times the diameter D of the ventilation pipe 35, whereby the oil blowout is extremely reduced without sacrificing the sound deadening characteristics. We were able to.

[0019]

As described above in detail, according to the muffler of the oil supply type compressor according to the present invention, the tip of the ventilation pipe is provided with the inner end surface of the housing and the support plate for supporting the filter element. Since it is extended to the area between the compressors, it is possible to significantly suppress the backflow of oil from the compressor from the ventilation pipe, and prevent the surroundings of the compressor from being seriously contaminated with oil. Not only is cleaning and maintenance easier, but the compressor can be packaged. Further, since the air introduced into the housing does not bypass the support plate and locally hits the filter element, the dustproof life of the filter element can be extended. Further, when the shielding plate is arranged in the front area of the ventilation pipe, fine oil droplets scattered in the housing collide with the shielding plate and are captured, so that the oil blowout from the ventilation pipe can be further suppressed. At the same time, it is possible to capture dust from the intake air, which has the effect of further extending the dust-proof life of the filter element.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a muffler of an oil supply type compressor according to the present invention.

FIG. 2 is a cross-sectional view showing the structure of the silencer at another cutting position.

FIG. 3 is a cross-sectional view showing the structure of an oil supply type compressor to which the present silencer is applied.

FIG. 4 is a side view showing an external appearance of a refueling compressor to which the present silencer is applied.

FIG. 5 is a graph showing the correlation between the installation position of the shielding plate and the noise value in the silencer.

[Explanation of symbols]

1 Refueling type compressor 2 pistons 3 cylinders 4 valve seat plate 5 cylinder head 16 Unloading mechanism 21 silencer 24 housing 27 Connection port 29 Filter element 30 support plate 35 ventilation pipe 36 Shield

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigeru Osaka             1116 Kozono, Ayase-shi, Kanagawa Tokiko stock             Company Sagami Factory (72) Inventor Tatsuya Yamazawa             1116 Kozono, Ayase-shi, Kanagawa Tokiko stock             Company Sagami Factory (72) Inventor Shinju Masuchibuchi             1116 Kozono, Ayase City, Kanagawa Prefecture Tokiko Giken             Sagami Business Office (72) Inventor Hiroshi Mitsuhashi             1116 Kozono, Ayase-shi, Kanagawa Tokiko stock             Company Sagami Factory

Claims (2)

[Claims] 1. A support plate, which is provided at a portion facing a connection opening in a housing having a connection opening to a suction opening of a compressor at one end thereof, is supported by an inner surface facing one end of the housing. And a filter element, and one end of a ventilation pipe that penetrates the side wall of the housing in a liquid-tight manner is extended to a region between the inner surface on the other end side of the housing and the support plate. Silencer of a rotary compressor. 2. A shield plate is further arranged in the front region of the ventilation pipe in the housing.
The silencer for the refueling compressor described in.