JP2008163905A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump device for enhancing sound deadening performance, by properly increasing the volume of an exhaust chamber 21A of an exhaust case 30A in a limited space. <P>SOLUTION: This pump device has a pump body provided with an intake port for sucking gas and an exhaust port for delivering the gas, and is integrally provided with a body part 41 of an intake case 40 arranging an intake chamber 42 connected to the intake port and a body part 31A of an exhaust case 30A arranging an exhaust chamber 21A connected to the exhaust port, and is formed by partitioning the intake chamber 42 and the exhaust chamber 21A by a partition wall 35 being a side wall used in common. The partition wall 35 is asymmetrically arranged in a state of being deviatively positioned to the intake chamber 42 side so as to become larger in the volume of the exhaust chamber 21A than the volume of the intake chamber 42. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pump device including a pump body provided with an intake port for sucking gas and an exhaust port for discharging gas.

As a silencer for reducing noise generated when gas is discharged from the vacuum pump device, a volume-type or expansion-type silencer method is used. The volumetric method is a method in which exhaust is guided to a space having a volume as large as possible, and the exhaust sound is attenuated by echo and silenced. The expansion method is a method in which the exhaust is contracted and expanded by a throttle portion or a pipe to mute the sound. According to this expansion method, the exhaust sound due to the pumping action of the pump can be effectively silenced.
However, in the volumetric method, it is difficult to suitably secure a space that can be set as a sound deadening chamber, and the sound deadening performance is naturally limited. Further, in the expansion method, the back pressure (venting resistance) tends to be high. Note that there is a sound absorption method as another silencing method.

Conventionally, the intake case connected to the intake port of the pump body and the exhaust case connected to the exhaust port of the pump body are provided substantially separately. That is, the intake chamber provided in the intake case and the exhaust chamber provided in the exhaust case are formed substantially independently.
Japanese Patent Application Laid-Open No. 55-119251 (FIG. 3)

Moreover, as a silencer provided with the throttle part, the first throttle port for passing the gas discharged from the exhaust port of the vacuum pump between two or more large rooms and the large room and the last large room A vacuum pump silencer having a structure for reducing the noise of the gas and exhausting it into the outside air in order through a second throttle port that communicates with the outside air. A silencer for a vacuum pump is proposed by the present applicant, characterized in that it is equipped with a regulating valve that adjusts the amount in a wide and narrow manner according to the pressure of the gas passing through the first throttle port or the amount of the gas passing therethrough. (See Patent Document 2).
However, in the case of a silencer provided with such a throttle portion, the silencing performance tends to decrease as the exhaust flow rate decreases. Moreover, since ventilation resistance tends to be high, energy is easily consumed wastefully.

On the other hand, as shown in FIG. 7, in the vacuum pump device, the first silencing chamber 51 connected to the exhaust port of the pump body via the exhaust introduction port, the first silencing chamber 51 and the partition wall portion. A second silencing chamber 52 arranged in series via 54 and a cylindrical shape whose both ends are closed, and a plurality of through holes 53 are provided in the side walls of both ends to open the first The present applicant has disclosed a silencer comprising a cylindrical member 56 fixed to a through-hole of a partition wall portion 54 so as to allow the silencer chamber 51 and the second silencer chamber 52 to communicate with each other (see Patent Document 1). ).
However, in the form as shown in FIG. 7, the sound deadening performance including the airflow resistance is inferior to the form in which the throttle part is provided.
JP 2001-289167 A (Claim 1, FIG. 1, FIG. 3)

The problem to be solved with respect to the pump device is that when the volume-type silencer structure is adopted, the volume of the exhaust chamber cannot be increased and the silencer performance cannot be increased in the conventional form.
SUMMARY OF THE INVENTION An object of the present invention is to provide a pump device in which the volume of an exhaust chamber of an exhaust case is appropriately increased in a limited space and the sound deadening performance is improved.

The present invention has the following configuration in order to achieve the above object.
According to an aspect of the pump device of the present invention, the pump device includes a pump body provided with an intake port for sucking gas and an exhaust port for discharging gas, and an intake chamber connected to the intake port A body portion of the intake case provided and a body portion of the exhaust case provided with an exhaust chamber connected to the exhaust port are integrally provided, and the intake chamber and the exhaust chamber are separated by a partition wall that is a shared side wall. And the partition wall is disposed asymmetrically in a state of being biased to the intake chamber side so that the volume of the exhaust chamber is larger than the volume of the intake chamber. .

Further, according to one aspect of the pump device according to the present invention, the partition wall is biased toward the intake chamber side in a curved shape following the outer peripheral shape of a cylindrical filter attached to the intake chamber. It is characterized in that it is formed in a state of being positioned.
Moreover, according to one form of the pump apparatus concerning this invention, the said exhaust case is provided as a silencer, and the said exhaust chamber is formed as a 1st silencer chamber connected to the exhaust port of the said pump main body by an exhaust introduction port. The second silencer chamber having a volume smaller than that of the first silencer chamber provided in series with the first silencer chamber and the partition wall, and the thick portion forming the exhaust inlet is the The exhaust inlet may be provided on the partition wall side of the first silencing chamber so as to be a part of the partition wall.

Further, according to one aspect of the pump device according to the present invention, the thick part forming the exhaust inlet and the side wall near at least the exhaust inlet are standard on other side walls forming the silencer. It can be characterized by being thicker than the wall thickness.
Moreover, according to one form of the pump apparatus concerning this invention, it was provided in the pipe shape which both ends opened, and penetrates the said partition part so that the said 1st silencer chamber and the said 2nd silencer chamber may be connected. And a pipe member arranged in a row.

  Moreover, according to one form of the pump apparatus concerning this invention, the said pump main body can be characterized by being a rotary type pump provided with a vane.

  The pump device according to the present invention has a particularly advantageous effect that the volume of the exhaust chamber of the exhaust case can be suitably increased in a limited space, and the noise reduction performance can be improved.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode of an intake case and an exhaust case according to the pump device of the present invention will be described in detail with reference to the accompanying drawings (FIGS. 1 and 2).
FIG. 1 is a cross-sectional view seen from above showing an embodiment of an intake case and an exhaust case of the present invention. FIG. 2 is a perspective view showing a form example of the central case portion of the intake case and the exhaust case.
The pump device to which the intake case and the exhaust case are attached includes a pump body 10 provided with an intake port 12 for sucking gas and an exhaust port 13 for discharging gas (see FIG. 3). If the gas to be discharged is used as the product gas, the pump device can be used as a blower device.

  Moreover, since the pump main body 10 is a vane type pump, the inlet 12 and the exhaust 13 are provided in the side surface part in parallel (refer FIG. 3). In the present embodiment, the intake port 12 and the exhaust port 13 are arranged on the upper surface of the pump main body 10 in the axially central portion so as to be arranged at intervals in a direction orthogonal to the axial direction.

Reference numeral 40 denotes an intake case having an intake chamber 42 connected to the intake port 12. Reference numeral 30 </ b> A denotes an exhaust case having an exhaust chamber 21 </ b> A connected to the exhaust port 13.
The longitudinal direction of the intake case 40 and the exhaust case 30A is the same as the extending direction of the axis of the rotary shaft 16, and the axes are parallel to each other.
With such an arrangement relationship, the intake case 40 and the exhaust case 30A can be appropriately arranged in a limited space.

Reference numeral 41 denotes a body portion of the intake case, and reference numeral 31A denotes a body portion of the exhaust case. The two body portions 41 and 31A are integrally provided, and the intake chamber 42 and the exhaust chamber 21A are partitioned by a partition wall 35 that is a shared side wall.
In this way, the body portion 41 of the intake case and the body portion 31A of the exhaust case are integrated, and thereby the central case portion 50 is configured.
The central case portion 50 can be efficiently mass-produced by die casting.

The partition wall 35 is disposed asymmetrically in a state of being biased toward the intake chamber 42 so that the volume of the exhaust chamber 21A is larger than the volume of the intake chamber 42.
According to this, the volume of the first silencing chamber 21 which is the exhaust chamber 21A of the exhaust case 30A can be suitably maximized in a limited space, and the volumetric silencing effect can be improved.

In addition, the partition wall 35 of the present embodiment is formed in a curved shape following the outer peripheral shape of the cylindrical filter 45 attached to the intake chamber 42 so as to be biased toward the intake chamber 42 side. Yes.
According to this, the volume of the first silencing chamber 21 that is the exhaust chamber 21A can be more preferably maximized, and the volume-type silencing effect can be improved.

Next, the case where the exhaust case 30A is provided in the vacuum pump device as the silencer 20 using both the volume method and the expansion method will be described with reference to FIGS.
FIG. 3 is a cross-sectional view showing a main part of an embodiment of the vacuum pump device according to the present invention. 3A is a cross-sectional view cut along an AA line parallel to the axis, and FIG. 3B is a cross-sectional view cut along a BB line orthogonal to the axis. FIG. 4 is a cross-sectional view showing details of the silencer used in the vacuum pump device of FIG. FIG. 5 is a perspective view showing the entire vacuum pump device.

The vacuum pump device includes a pump body 10 that causes a device connected to the intake side to be depressurized, and a silencer 20 that is connected to an exhaust port 13 of the pump body 10.
The pump body 10 is a rotary type vacuum pump including a vane 11 and is a vacuum pump that is operated by a driving unit such as an electric motor 15 (see FIG. 5). Reference numeral 16 denotes a rotating shaft, to which the power of the electric motor 15 is transmitted. The vacuum pump device according to the present embodiment is an oil-free pump. If the exhaust gas is a product gas, it can be used as a blower device. In the vacuum pump device of FIG. 5, two pump bodies 10 are arranged in parallel and are driven by one electric motor.

The silencer 20 has the following configuration.
Reference numeral 21 denotes a first silencing chamber, which is connected to the exhaust port 13 of the pump body 10 by an exhaust introduction port 23. The exhaust chamber 21 </ b> A shown in FIG. 1 is provided as the first silencer chamber 21.
Reference numeral 22 denotes a second silencing chamber, which is provided in series via the first silencing chamber 21 and the partition wall 24 and is provided in a volume smaller than that of the first silencing chamber 21. That is, the first silencing chamber 21 and the second silencing chamber 22 are provided adjacent to each other in the axial direction by sharing the partition wall portion 24.
Reference numeral 25 denotes a pipe member, which is provided in a pipe shape having both ends opened, and is arranged through the partition wall portion 24 so as to communicate the first silencing chamber 21 and the second silencing chamber 22.

The pipe member 25 is fixed to the center so that the axis of the pipe member 25 coincides with the axis of the silencer 20 itself. The axial center of the pipe member 25 and the silencer 20 has a mounting relationship parallel to the axial center of the rotating shaft 16.
The pipe member 25 may be fixed by using known fixing means. For example, as shown in FIG. 4, the pipe member 25 is fixed by press-fitting the pipe member 25 into a through hole provided in the partition wall portion 24. be able to. As still another fixing method, the pipe member 25 may be fixed to the partition wall 24 by screwing or the like through a bracket to which the pipe member 25 is fixed.

The thick part 23a forming the exhaust inlet 23 of the silencer 20 and the side wall part 26a at least in the vicinity of the exhaust inlet 23 are thicker than the standard thickness of the other side walls 26 forming the silencer 20. Is provided. In this embodiment, the entire side wall of the surface of the central body portion 31 described later where the exhaust inlet 23 is provided is thicker than the standard thickness of the other side wall 26 by 1.5 times or more.
Thereby, solid vibration can be attenuated, and annoying noise can be reduced. Thus, the sound is appropriately silenced by both the effects of attenuating the solid vibration and attenuating the fluid vibration by the volume method or the expansion method.

Further, as shown in FIG. 4, the exhaust introduction port 23 is formed on the partition wall 24 side of the first silencing chamber 21 so that the thick portion 23 a forming the exhaust introduction port 23 becomes a part of the partition wall 24. Is provided. One end 25a of the pipe member 25 is opened in the first silencing chamber 21 toward the side opposite to the partition wall 24 side.
Thereby, the volume of the first silencing chamber 21 that is the exhaust chamber 21A of the exhaust case 30A can be utilized to the maximum, and the volume-based silencing can be effectively performed. Also, the air flow can be reversed, thereby enhancing the silencing effect.

Reference numeral 27 denotes a small hole exhaust passage, and a plurality of exhaust passages are provided so as to exhaust the exhaust gas flowing through the pipe member 25 and flowing into the second silencing chamber 22 in a diverted state. The small-hole exhaust passage 27 is formed by a small-diameter cylindrical portion 29 that extends from the end face wall 28 that forms the second silencing chamber 22 toward the opposing partition portion 24.
By dividing the exhaust gas in this way, the silencing effect can be enhanced while preventing the ventilation resistance from increasing.

The other end 25 b of the pipe member 25 is opened at a position opposite to the partition wall 24 side from the center in the second silencing chamber 22.
An opening 27a in the second silencing chamber 22 in the small hole exhaust passage 27 formed by the small diameter cylindrical portion 29 is provided at a position closer to the partition wall portion 24 than the other end 25b of the pipe member 25. Yes.
Furthermore, the opening 27 a in the second silencing chamber 22 in the small hole exhaust path 27 of the present embodiment is provided at a position closer to the partition wall portion 24 than the center in the second silencing chamber 22.
Thereby, the flow of exhaust gas can be largely reversed at two locations, and the silencing effect can be enhanced.

Further, when the pump main body 10 is used as a pump part of a blower device, the dust collecting filter 45 is detachably provided in the first silencer chamber 21 and the pipe member 25 is detachably attached to the partition part 24. Yes.
According to this, the vacuum pump device of this embodiment can be suitably used as a blower device, and versatility can be improved.

Further, as shown in FIG. 4, the body 30 constituting the silencer 20 is connected to the central body portion 31 including the partition wall portion 24 and the central body portion 31 so as to be integrated with the first silencer chamber. 21, and one end side body portion 32 that is connected to the central body portion 31 to form the second silencing chamber 22 together.
In the present embodiment, a connecting sleeve 34 is interposed between the central body portion 31 and the one end side body portion 32.
Thus, since the body 30 is comprised by several body parts, it can shape | mold appropriately and can be assembled easily.

  According to the vacuum pump device having the above configuration, the exhaust sound of the silencer alone can be reduced by 8 dB, and the generated sound of the entire device can be reduced by 3 dB, compared with the conventional product. Moreover, the ventilation resistance could be reduced.

Next, based on FIG. 6, another embodiment of the silencer will be described with respect to the best embodiment according to the vacuum pump device of the present invention.
A silencer 120 shown in FIG. 6 is connected to the exhaust port 13 of the pump body 10 to constitute a vacuum pump device that causes a pressure-reduced state to occur in the equipment connected to the intake side.

Reference numeral 121 denotes a first silencing chamber, which is connected to the exhaust port 13 of the pump body 10 via the exhaust introduction port 123.
Reference numeral 122 denotes a second silencing chamber, and the first silencing chamber 121 is provided in series via a first partition wall portion 124 provided on the exhaust inlet 123 side.
Reference numeral 130 denotes a third silencing chamber, and the first silencing chamber 121 is provided in series via a second partition wall 131 provided on a surface facing the first partition wall 124.
Reference numeral 125 denotes a first pipe member, which is provided in a pipe shape having both ends opened, and is arranged so as to communicate the first silencing chamber 121 and the third silencing chamber 130.
Reference numeral 132 denotes a second pipe member, which is provided in a pipe shape having both ends opened, and is arranged so as to communicate the third silencing chamber 130 and the second silencing chamber 122.

Reference numeral 127 denotes a small hole exhaust passage, and a plurality of exhaust passages are provided to exhaust the exhaust gas flowing into the second silencing chamber 122 in a diverted state.
According to the configuration of the silencer 120 shown in FIG. 6 described above, higher silencer performance can be obtained by using three silencer chambers.

  As described above, the present invention has been described in various ways with preferred embodiments. However, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

It is sectional drawing which shows the example of an exhaust case and the intake case which concern on this invention. It is a perspective view which shows the example of a center case part of an exhaust case and an intake case. It is sectional drawing which shows the principal part of the form example of the pump apparatus which concerns on this invention. It is sectional drawing which shows the detail of the silencer used for the pump apparatus of FIG. It is a perspective view which shows the example of a form of the pump apparatus which concerns on this invention. It is a side view which shows the other example of a silencer which concerns on this invention. It is sectional drawing which shows the prior art of the silencer for vacuum pump apparatuses.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pump main body 11 Vane 12 Intake port 13 Exhaust port 15 Electric motor 20 Silencer 21 1st silencer chamber 21A Exhaust chamber 22 2nd silencer chamber 23 Exhaust inlet 23a Thick part 24 Partition part 25 Pipe member 26 Side wall 26a Side wall Portion 30A Exhaust Case 31A Exhaust Case Body 35 Partition Wall 40 Intake Case 41 Intake Case Body 42 Intake Chamber 45 Filter 50 Central Case

Claims (6)

A pump device comprising a pump body provided with an intake port for sucking gas and an exhaust port for discharging gas,
The body portion of the intake case provided with the intake chamber connected to the intake port and the body portion of the exhaust case provided with the exhaust chamber connected to the exhaust port are integrally provided and used as a side wall. The intake chamber and the exhaust chamber are partitioned and formed by a partition wall,
The pump device according to claim 1, wherein the partition wall is disposed asymmetrically in a state of being biased toward the intake chamber so that a volume of the exhaust chamber is larger than a volume of the intake chamber.   The partition wall is formed in a curved shape following the outer peripheral shape of a cylindrical filter attached to the intake chamber so as to be biased toward the intake chamber side. Item 2. The pump device according to Item 1. The exhaust case is provided as a silencer, and the exhaust chamber is formed as a first silencer chamber connected to an exhaust port of the pump body by an exhaust introduction port,
A second silencing chamber provided in series with the first silencing chamber and the partition wall, and having a volume smaller than that of the first silencing chamber;
The exhaust introduction port is provided on the partition wall side of the first silencing chamber so that a thick part forming the exhaust introduction port becomes a part of the partition wall. The pump device according to 1 or 2.   The thick part forming the exhaust inlet and the side wall near at least the exhaust inlet are provided thicker than the standard thickness of the other side walls forming the silencer. Item 4. The pump device according to Item 3.   A pipe member provided in the shape of a pipe having both ends opened and provided to penetrate the partition wall so as to communicate the first silencing chamber and the second silencing chamber. Item 5. The pump device according to Item 3 or 4.   6. The pump device according to claim 1, wherein the pump body is a rotary pump including a vane.

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