JP3879916B2 - Exhaust mechanism of rotary vane pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust mechanism of a rotary vane pump that rotates a rotor in which a vane is inserted in a housing.
[0002]
[Prior art]
In the conventional rotary vane pump exhaust mechanism, generally, for example, as shown in FIG. 3, the gas discharged from the inside of the housing 20 that rotates the rotor 10 in which the vane 12 is inserted is passed through the silencer 30. Then, after the noise of the gas is reduced, the gas in the silencer 30 is passed through the gas exhaust port 32 of the silencer and the partition chamber 40 communicating with the gas exhaust port, and the exhaust port of the partition room The air is discharged from the air 42 into the outside air or sent into a pipe line (not shown) connected to the exhaust port 42 of the partition room.
The exhaust mechanism of the rotary vane pump has a structure in which a pressure adjusting valve 50 is provided at the gas discharge port 32 of the silencer as shown in FIG. 3 recently published in Japanese Patent Laid-Open No. 2001-289167. Things have been developed.
In this exhaust mechanism, when the pressure of the gas passing through the gas exhaust port 32 of the silencer increases, that is, when the pressure of the gas in the silencer 30 increases, or the amount of gas flowing into the silencer 30 increases. When the amount of gas passing through the gas discharge port 32 increases, the opening amount of the gas discharge port 32 of the silencer can be increased by the pressure adjustment valve 50 accordingly. The amount of gas discharged from the silencer 30 to the outside of the silencer 30 can be increased through the gas discharge port 32 whose opening amount is increased by the pressure adjustment valve 50.
Conversely, when the pressure of the gas passing through the gas exhaust port 32 of the silencer decreases, that is, when the pressure of the gas in the silencer 30 decreases, or the amount of gas flowing into the silencer 30 decreases, When the amount of gas passing through the gas outlet 32 decreases, the amount of opening of the silencer gas outlet 32 can be reduced by the pressure adjusting valve 50 accordingly. The amount of gas discharged from the silencer 30 to the outside of the silencer 30 can be reduced through the gas discharge port 32 whose opening amount is reduced by the pressure regulating valve 50.
Then, the pressure of the gas in the silencer 30 that greatly increases or decreases as the amount of gas flowing into the silencer 30 increases or decreases can be leveled to a state close to a substantially constant value. Then, the gas in the silencer 30 whose pressure is leveled to a substantially constant value can be discharged from the silencer 30 through the gas discharge port 32 of the silencer.
As a result, an excessive load is applied to the vane 12 in the housing 20 of the rotary vane pump communicating with the silencer 30 from the gas whose pressure in the silencer 30 is increased, resulting in a large power loss in the rotary vane pump or noise reduction. Since the pressure of the gas in the muffler 30 has decreased, the load applied to the gas discharged from the muffler 30 to the outside of the muffler 30 through the gas discharge port 32 becomes too small, and the gas that passes through the muffler 30 It can be prevented by the pressure regulating valve 50 that the noise of the pressure cannot be sufficiently reduced.
[0003]
[Problems to be solved by the invention]
However, in the exhaust mechanism of the rotary vane pump described above, as shown in FIG. 3, the gas discharged from the muffler 30 through the gas discharge port 32 to the outside of the muffler 30 is stored in a large size in which the pressure adjustment valve 50 is accommodated. The partition room 40 is provided through the inside of the partition room 40 to be discharged into the outside air from the exhaust port 42 of the partition room or sent into a pipe line connected to the exhaust port 42 of the partition room. For this reason, the rotary vane pump exhaust mechanism has become larger and more complicated. Therefore, the exhaust mechanism of the rotary vane pump cannot be reduced in size and simplified.
[0004]
In the exhaust mechanism of the rotary vane pump, when the rotary vane pump is started, the pressure of the gas discharged from the pump increases rapidly, or the amount of discharged gas increases rapidly. And the pressure of the gas which flows in in the silencer 30 increases rapidly, or the amount of gas which flows in in the silencer 30 increases rapidly. Therefore, when the rotary vane pump is started, the pressure adjusting valve 50 provided in the gas exhaust port 32 of the silencer is a gas in which the pressure flowing into the silencer 30 suddenly increases or the inflow amount suddenly increases. As a result, the gas exhaust port 32 of the muffler is pushed up sharply to the outside and the gas exhaust port 32 of the muffler is greatly opened. Next, the gas in the silencer 30 suddenly escapes to the outside of the silencer 30 from the widely opened gas discharge port 32, and the pressure of the gas in the silencer 30 rapidly decreases, or the inside of the silencer 30. The amount of gas decreases rapidly. Then, the pressure regulating valve 50 pushed up to the outside of the gas discharge port 32 suddenly descends in the direction of the gas discharge port 32 and violently collides with the silencer 30 around the gas discharge port 32. Thereafter, the same steps are repeated, and the pressure adjustment valve 50 vibrates greatly in and out of the gas discharge port 32. As a result, the vibration sound of the pressure regulating valve 50 that vibrates greatly in and out of the gas discharge port 32 deteriorated the surrounding environment.
[0005]
An object of the present invention is to provide an exhaust mechanism of a rotary vane pump that can solve such a problem.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, the exhaust mechanism of the rotary vane pump of the present invention allows the gas discharged from the housing that rotates the rotor in which the vane is inserted to pass through the silencer, and the gas has An exhaust mechanism of a rotary vane pump that, after reducing noise, discharges the gas in the silencer through the gas exhaust port of the silencer to the outside of the silencer,
A rotary vane pump provided with a pressure adjusting valve at the gas outlet of the silencer that increases or decreases the amount of opening of the gas outlet in accordance with the increase or decrease of the pressure of gas in the silencer or the amount of gas flowing into the silencer. In the exhaust mechanism of
The silencer outer wall around the gas outlet provided with the pressure regulating valve has a cylindrical pipe line connecting portion that communicates the inner space of the pipe line connecting portion with the gas outlet port, and surrounds the pressure regulating valve. It is characterized by being provided so as to surround.
[0007]
In the exhaust mechanism of the rotary vane pump, the gas discharged from the silencer through the gas discharge port to the outside of the silencer is disposed inside the cylindrical pipe line connection portion provided on the silencer outer wall around the gas discharge port. Therefore, the air can be discharged directly into the outside air outside the silencer without being passed through the large partition room, or can be directly fed into a pipe line connected to the pipe line connecting portion.
At the same time, the inner space of the cylindrical pipe line connecting portion can be used as a room for operably accommodating the pressure regulating valve.
Therefore, the pump exhaust mechanism can be reduced in size and simplified because the above-described partition chamber is not provided in the pump exhaust mechanism.
In other words, the pipe line connecting portion provided on the outer wall of the silencer around the gas discharge port for connecting the pipe line is also used as a partition room for accommodating the pressure regulating valve, and accommodates the pressure regulating valve. The pump exhaust mechanism can be miniaturized or simplified because no separate room is provided.
[0008]
In the exhaust mechanism of the rotary vane pump according to the present invention, it is preferable that a gas leakage path for allowing a part of the gas in the silencer to escape to the inner space of the pipe line connection portion is provided. The gas leakage path may be a small hole or groove provided in the silencer portion around the pressure adjusting valve or the gas discharge port and communicating between the inside of the silencer and the inner space of the pipe line connecting portion.
[0009]
In that case, when the rotary vane pump is started, the pressure of the gas flowing into the silencer from the pump suddenly increases or the amount of gas increases rapidly. A part of the silencer is provided through a gas leakage path consisting of a small hole or groove that communicates the interior of the silencer and the inner space of the pipe line connection part provided in the silencer part around the pressure regulating valve or gas outlet. It is possible to escape from the inside to the inner space of the pipe connection part. Conversely, when the pressure of the gas in the silencer suddenly drops or the amount of gas suddenly drops when the rotary vane pump is started, a part of the gas in the inner space of the pipe connection part Through the gas leakage path consisting of a small hole or groove that communicates the interior of the silencer and the inner space of the pipe connection section, which is provided in the silencer part around the pressure regulating valve or gas outlet. It can be made to flow backward. And the gas pressure and the gas amount in the silencer that greatly increase or decrease when the rotary vane pump is started can be relaxed. When the rotary vane pump is started, the pressure of the gas in the silencer increases rapidly, or the amount of gas increases rapidly. When the pressure is rapidly increased to the outside of the outlet, or conversely, the pressure of the gas in the silencer decreases rapidly, or the amount of the gas decreases sharply, the pressure increases to the outside of the gas outlet. It is possible to prevent the produced pressure regulating valve from dropping rapidly in the direction of the gas discharge port and violently colliding with the silencer portion around the gas discharge port. And it can prevent that the pressure regulation valve vibrates violently greatly inside and outside a gas exhaust port, and emits a loud vibration sound.
[0010]
Further, in the exhaust mechanism of the rotary vane pump of the present invention, the pipe line connecting part is connected to a pipe line for sending the gas discharged from the silencer through the gas discharge port into the inner space of the pipe line connecting part. It is preferable to have a structure provided with connection means for this purpose.
The connecting means may be a female screw engraved on the inner wall of the pipe line connecting part or a male screw engraved on the outer wall of the pipe line connecting part for screwing the pipe line to the pipe line connecting part.
[0011]
In that case, the connecting means such as a female screw engraved on the inner side wall of the pipe line connecting part or a male screw engraved on the outer side wall of the pipe line connecting part is used to connect the pipe line connecting part and the pipe line. It can be easily and quickly screwed and connected to each other through a pipe joint such as a nipple or directly. The inner space of the pipe line connecting portion and the inside of the pipe path can be communicated with each other via the pipe joint inner space or directly. And the gas discharged | emitted from the silencer into the inner space of the pipeline connection part can be sent into the pipeline without leaking.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a preferred embodiment of an exhaust mechanism of a rotary vane pump according to the present invention, FIG. 1 is an enlarged sectional view thereof, and FIG. The exhaust mechanism will be described below.
[0013]
The exhaust mechanism of the rotary vane pump is discharged from the inside of the housing 20 that rotates the rotor in which the vane is inserted, as shown in FIG. 2, having the same structure as the rotary vane pump shown in FIG. Rotation of passing the gas to be passed through the silencer 30 to reduce the noise of the gas, and then discharging the gas in the silencer 30 to the outside of the silencer 30 through the gas outlet 32 of the silencer. An exhaust mechanism of the vane pump, in which the pressure adjusting valve 50 that increases or decreases the opening amount of the gas discharge port 32 according to the increase or decrease of the gas pressure in the silencer 30 or the amount of gas flowing into the silencer 30 is silenced. It is equipped with the exhaust mechanism of the rotary vane pump provided in the gas discharge port 32 of the vessel.
[0014]
In this exhaust mechanism, as shown in FIG. 1, a cylindrical pipe line connection portion 60 is provided on the outer wall of the silencer 30 around the gas discharge port 32 provided with the pressure regulating valve 50 of the rotary vane pump. The inner space 62 of the pipe line connecting portion communicates with the gas exhaust port 32 of the silencer and is erected so as to surround the pressure regulating valve 50.
[0015]
The pressure regulating valve 50 has a structure in which a disc-shaped valve main body 54 is provided in a T shape at the tip of a valve rod 52. The valve stem 52 is loosely inserted in the axial direction at the center of the gas discharge port 32 so as to be movable up and down. And it is comprised so that the gas exhaust port 32 can be block | closed from the outer side by the valve main body 54 at the front-end | tip of the valve rod 52 by dropping the valve rod 52 in the gas exhaust port 32 to the downward direction. Conversely, by raising the valve rod 52 in the gas discharge port 32 upward, the valve body 54 at the tip of the valve rod 52 can be lifted above the gas discharge port 32 to open the gas discharge port 32. It is configured as follows. Around the lower surface of the valve body 54, a ring 56 made of a flexible material such as a felt material is attached. When the valve main body 54 is lowered, the lower surface of the valve main body 54 is cushioned to the outer wall of the silencer 30 around the gas discharge port 32 through the ring 56 made of a flexible material, and impact is reduced. It has a structure that can be made to.
[0016]
A partition wall 34 is installed inside the middle part of the gas discharge port 32. A plurality of through holes 33 are provided on the surface of the partition wall 34. And, through the plurality of through holes 33, the gas can flow freely in the vertical direction inside the gas discharge port 32 without being blocked by the partition wall 34. A vertically long guide hole 36 is opened at the center of the partition wall 34, and a middle portion of the valve rod 52 is slidably inserted vertically into the guide hole 36. And the valve rod 52 of the pressure regulating valve 50 is supported by the partition wall 34 so that it can move up and down in the axial direction of the center in the gas discharge port 32 of the silencer. A compression coil spring 72 is loosely fitted around the valve rod 52 between the upper surface of the partition wall 34 and the lower surface of the valve body 54 facing the partition wall 34. The urging force that raises the valve body 54 outward from the gas discharge port 32 is applied to the valve body 54 by the compression coil spring 72. Similarly, a compression coil spring 74 is loosely fitted around the valve rod 52 between the lower surface of the partition wall 34 and the upper surface of the ring 58 fitted around the lower end of the valve rod 52 opposite thereto. A biasing force that lowers the valve body 54 inward of the gas discharge port 32 is applied to the valve body 54 by the compression coil spring 74. Then, as described above, when a gas such as air from the silencer 30 tries to escape to the outside of the silencer 30 through the gas discharge port 32, the pressure adjustment valve 50 is pushed up to the outside of the gas discharge port 32. Further, the elastic force of the compression coil spring 72 is assisted, so that the pressure regulating valve 50 can be surely pushed up to the outside of the gas discharge port 32. Next, when the gas in the silencer 30 escapes from the gas outlet 32 to the outside of the silencer 30, the atmospheric pressure in the silencer 30 decreases, and the pressure adjustment valve 50 attempts to descend toward the gas outlet 32. The pressure adjusting valve 50 pushed up to the outside of the gas discharge port 32 can be reliably lowered in the direction of the gas discharge port 32 by assisting the elastic force of the compression coil spring 74. That is, the elastic force of the compression coil springs 72 and 74 is assisted to allow the pressure regulating valve 50 to be raised and lowered reliably and smoothly inside and outside the gas discharge port 32.
[0017]
And by such a structure, the cylindrical piping path installed in the silencer 30 outer wall around the gas exhaust port 32 with the gas exhausted from the silencer 30 through the gas exhaust port 32 to the outside of the silencer 30 Without passing through the inside of the large partition room 40 described above through the inner space 62 of the connecting portion, it is discharged directly into the outside air outside the silencer 30 or into the piping 80 connected to the piping connecting portion 60. It can be sent directly.
At the same time, the valve main body 54 of the pressure regulating valve 50 can be moved up and down by an appropriate amount in the inner space 62 of the pipe connection portion in accordance with the increase or decrease of the gas pressure or the gas inflow amount in the silencer 30. I have to. Then, the amount of gas discharged from the silencer 30 to the outside of the silencer 30 through the gas discharge port 32 of the silencer is increased or decreased by the pressure adjustment valve 50. Can be increased or decreased. The gas pressure in the silencer 30 can be leveled to a substantially constant value.
The exhaust mechanism can be reduced in size or simplified by the amount that the partition chamber 40 in which the pressure regulating valve 50 is accommodated is not provided in the exhaust mechanism.
[0018]
In addition, the exhaust mechanism of the rotary vane pump shown in the figure is provided with a gas leakage path 100 that allows a part of the gas in the silencer 30 to escape to the inner space 62 of the pipe line connecting portion.
The gas leakage path 100 is a small hole or groove (in FIG. 1) that communicates between the silencer 30 and the inner space 62 of the pipe line connection portion provided in the silencer 30 portion around the pressure regulating valve 50 or the gas discharge port 32. , A small hole provided vertically through the valve main body 54 of the pressure regulating valve.
[0019]
With such a configuration, when the rotary vane pump is started, when the pressure of the gas flowing into the silencer 30 from the pump suddenly increases or the amount of the gas suddenly increases, the silencer 30 A small hole or groove that communicates a part of the gas that flows into the silencer 30 and the inner space 62 of the pipe line connection portion provided in the silencer 30 part around the pressure regulating valve 50 or the gas discharge port 32. Through the gas leakage path 100 made of, etc., it is possible to escape from the silencer 30 to the inner space 62 of the pipe line connecting portion. Conversely, when the pressure of the gas in the silencer 30 is suddenly reduced or the amount of gas is suddenly reduced when the rotary vane pump is started, the gas in the inner space 62 of the pipe connection portion is reduced. Gas leakage comprising a small hole or a groove or the like partially communicating with the inside of the silencer 30 and the inner space 62 of the pipe line connection portion provided in the silencer 30 portion around the pressure regulating valve 50 or the gas discharge port 32 It can be made to flow back into the silencer 30 through the path 100. And the pressure and gas quantity of the gas in the silencer 30 which increase / decrease largely at the time of starting of a rotary vane pump can be eased. When the rotary vane pump is started, the pressure of the gas in the silencer 30 increases rapidly, or the amount of the gas increases rapidly, and the pressure adjustment valve 50 provided in the gas discharge port 32 of the silencer The valve body 54 is suddenly pushed up to the outside of the gas discharge port 32, or conversely, the pressure of the gas in the silencer 30 is suddenly reduced or the amount of gas is suddenly reduced. The valve main body 54 of the pressure regulating valve 50 that is pushed up to the outside of the gas exhaust port 32 suddenly descends in the direction of the gas exhaust port 32 and collides with the silencer 30 around the gas exhaust port 32 violently. It can be prevented. And it can prevent that the pressure regulation valve 50 vibrates greatly greatly in and out of the gas exhaust port 32, and emits a vibration sound.
[0020]
In addition, in the exhaust mechanism of the rotary vane pump of the present invention, when it is not necessary to worry about the collision noise of the pressure regulating valve 50, the exhaust mechanism of the rotary vane pump of the present invention includes the space inside the silencer 30 and the pipe connection portion Of course, it is not necessary to provide the gas leakage path 100 that communicates with 62.
[0021]
In the exhaust mechanism of the rotary vane pump, as shown in FIG. 1, the gas discharged from the silencer 30 through the gas discharge port 32 into the inner space 62 of the pipe line connection portion at the pipe line connection portion 60. It is preferable to provide connection means 90 for connecting the pipe line 80 for feeding the water.
The connecting means 90 is engraved on the inner wall of the pipe line connecting part 60 or the outer wall of the pipe line connecting part 60 for screwing and connecting the pipe line 80 to the pipe line connecting part 60. It is good to comprise from the external thread (in FIG. 1, it is set as the external thread 92 carved in the outer side wall of the piping connection part 60).
Then, using the connecting means 90 such as the internal thread engraved on the inner side wall of the pipe line connecting part or the external thread 92 engraved on the outer side wall of the pipe line connecting part, the pipe line connecting part 60 and the pipe line 80 It is preferable that the screw can be easily and quickly screwed and connected to each other through a pipe joint such as a nipple or directly (directly in FIG. 1). Then, it is preferable that the inner space 62 of the pipe line connecting portion and the inside of the pipe path 80 can be communicated with each other via the pipe joint inner space or directly. The gas discharged from the silencer 30 to the inner space 62 of the pipe line connection portion may be sent into the pipe line 80 without leaking.
The connection means 90 may be a coupling type one.
[0022]
【The invention's effect】
As described above, according to the exhaust mechanism of the rotary vane pump of the present invention, it is possible to provide an exhaust mechanism of a small rotary vane pump that is greatly simplified in structure and easy to manufacture.
In addition, according to the exhaust mechanism of the rotary vane pump provided with a gas leakage passage that communicates the inside of the silencer and the inner space of the pipe connection portion, the pressure adjusting valve collides with the silencer portion around the gas discharge port. It is possible to greatly reduce the impact noise generated and the vibration noise generated when the pressure regulating valve vibrates greatly. And the exhaust mechanism of the rotary vane pump without noise pollution can be provided.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an enlarged structure of an exhaust mechanism of a rotary vane pump according to the present invention.
FIG. 2 is an explanatory view of an attached state of the exhaust mechanism of the rotary vane pump of the present invention.
FIG. 3 is a structural explanatory diagram of an exhaust mechanism of a conventional rotary vane pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Rotor 12 Vane 20 Housing 30 Silencer 32 Gas exhaust port 40 of silencer Partition room 42 Exhaust port 50 Pressure regulating valve 60 Pipe line connection part 80 Pipe line 90 Connection means 100 Gas leak path

Claims (4)

After the gas discharged from the housing that rotates the rotor in which the vanes are inserted passes through the silencer to reduce the noise of the gas, the gas in the silencer is discharged from the silencer. An exhaust mechanism of a rotary vane pump that discharges to the outside of the silencer through an outlet,
A rotary vane pump provided with a pressure adjusting valve at the gas outlet of the silencer that increases or decreases the amount of opening of the gas outlet in accordance with the increase or decrease of the pressure of gas in the silencer or the amount of gas flowing into the silencer. In the exhaust mechanism of
The silencer outer wall around the gas outlet provided with the pressure regulating valve has a cylindrical pipe line connecting portion that communicates the inner space of the pipe line connecting portion with the gas outlet port, and surrounds the pressure regulating valve. The exhaust mechanism of the rotary vane pump is further provided with a gas leakage path for allowing a part of the gas in the silencer to escape to the inner space of the pipe line connection portion . 2. The rotation according to claim 1 , wherein the gas leakage path is a small hole or groove that is provided in a silencer portion around the pressure regulating valve or the gas outlet and communicates the inside of the silencer and the inner space of the pipe connection part. Vane pump exhaust mechanism. To the pipe passage connecting portion, piping passage connecting portion of the gas outlet through the connection means according to claim 1 or 2, wherein provided is for connecting a pipe line for feeding the discharged gas from the muffler in the inner space Exhaust mechanism of rotary vane pump. The connection means is a female screw engraved on the inner wall of the pipe line connection part or an external screw engraved on the outer wall of the pipe line connection part for screwing the pipe line to the pipe line connection part. The exhaust mechanism of the rotary vane pump according to 3 .

Images