Oil rotary vacuum pump

Abstract

An oil rotary vacuum pump according to one embodiment of the present invention is provided with: a pump main body having an intake port, an exhaust port, a pump chamber for conveying gas from the intake port to the exhaust port, and an exhaust valve provided at the exhaust port, the exhaust valve preventing gas from flowing back from the exhaust port to the pump chamber; the housing has: a storage chamber that accommodates the pump body and stores lubricating oil supplied to the pump chamber; and an exhaust passage that communicates the storage chamber with outside air. The first baffle plate comprises a first housing part which is arranged on the pump main body and covers the exhaust valve, a first discharge port which is arranged on the first housing part and discharges the gas discharged from the exhaust port to the storage chamber, and a first wall part which is arranged on the first housing part and divides the space between the exhaust port and the first discharge port into a plurality of space parts.

Description

TECHNICAL FIELD

[0001] The present application relates to an oil rotary vacuum pump. BACKGROUND

[0002] An oil rotary vacuum pump realizes a desired pump function by sucking, compressing, and discharging gas while rotating a rotor in a pump chamber. At this time, vacuum pump oil is used for lubrication of the rotor that slides on the inner surface of the pump chamber and lubrication of a bearing portion of a rotation shaft that supports the rotor to rotate.

[0003] As the oil rotary vacuum pump, there are known types such as a Gede type, a lobe type, and a swing piston type. In the case of the Gede type, the above-described rotor corresponds to a rotor blade that includes a rotor and a plurality of blades.

[0004] Further, in Patent Literature 1, there is described a Gede type oil rotary vacuum pump that has a cylinder wall having a gas discharge port, a gas discharge valve that covers the gas discharge port, and a gas discharge baffle that is provided with an opening that passes gas and bends the direction of the gas on a side wall that houses an oil tank that stores oil that hermetically holds the gas discharge port and the gas discharge valve.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Realization Patent Publication No. Hei 7-17985 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] However, in the structure of Patent Literature 1, when the gas discharged from the gas discharge port flows to the opening, the discharged gas directly rises from the oil tank. That is, the discharged gas is released to the air in a large lump, and thus there is a problem that noise caused by a breaking sound of the lump of the gas generated when released to the air is easily generated.

[0010] In view of the above, an object of the present application is to provide an oil rotary vacuum pump that can reduce noise caused by discharged gas.

[0011] SOLUTION TO PROBLEM

[0012] In order to achieve the above object, an oil rotary vacuum pump of one embodiment of the present application has a pump main body, a housing, and a first baffle.

[0013] The above-described pump main body has a gas inlet port, a gas discharge port, a pump chamber that transports gas from the gas inlet port to the gas discharge port, and a gas discharge valve provided at the gas discharge port, and the gas discharge valve prevents backflow of gas from the gas discharge port to the pump chamber.

[0014] The housing has a storage chamber that houses the pump body and stores lubricating oil supplied to the pump chamber, and an exhaust passage that communicates the storage chamber with outside air.

[0015] The first baffle has a first housing portion provided to the pump body and covering the exhaust valve, a first discharge outlet provided to the first housing portion and discharging gas discharged from the exhaust port to the storage chamber, and a first wall portion provided to the first housing portion and partitioning a space between the exhaust port and the first discharge outlet into a plurality of space portions.

[0016] In the above structure, the first baffle having the first discharge outlet that discharges gas discharged from the exhaust port provided to the pump body to the storage chamber has the first wall portion that partitions a space between the exhaust port and the first discharge outlet into a plurality of space portions. Thereby, the gas discharged from the exhaust port is inhibited from being directly discharged to the first discharge outlet. That is, by the gas discharged from the exhaust port colliding with the first wall portion, sound generated by the gas is attenuated, so that noise emitted to the outside of the first baffle can be reduced.

[0017] The plurality of space portions can be configured to be capable of housing the lubricating oil discharged from the exhaust port, and the first wall portion can include a vertical wall portion extending downward from a top surface of the first housing portion.

[0018] The first wall portion can include a plurality of wall surface portions extending in a direction intersecting the vertical wall portion.

[0019] The first baffle can further include a second baffle provided to the first housing portion, the second baffle can have a second housing portion covering the first discharge outlet and a second discharge outlet provided to the second housing portion and discharging gas discharged from the first discharge outlet to the storage chamber, and a passage portion that communicates between the first discharge outlet and the second discharge outlet can be formed by the second baffle being overlaid on the first baffle.

[0020] The passage portion can be configured to be capable of housing the lubricating oil discharged from the first discharge outlet.

[0021] A separation distance in a horizontal direction between the first discharge outlet and the second discharge outlet can be longer than a separation distance in a horizontal direction between the exhaust port and the first discharge outlet.

[0022] The second discharge outlet can be provided to a top surface, a side surface, or a bottom surface of the second housing.

[0023] The second discharge outlet can be a single hole portion or an arrangement of a plurality of hole portions.

[0024] The second baffle can further include a second wall portion provided in the second housing portion and partitioning the passage portion into a plurality of space portions.

[0025] The second wall portion can be provided in the second housing portion in such a manner that the flow direction of the gas in the passage portion becomes at least two directions.

[0026] The storage chamber can store the lubricating oil at a liquid level immersed by the first baffle.

[0027] Inventive Effects

[0028] According to the present application, noise generated by gas discharged from an oil rotary vacuum pump can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 (A) is a side sectional view showing the structure of an oil rotary vacuum pump according to a first embodiment of the present application.

[0030] Figure 2 (B) is an enlarged view of a pump body of the oil rotary vacuum pump.

[0031] Figure 3 (A) is a sectional view taken along the line Figure 2 (A) is a sectional view taken along the line

[0032] Figure 4 (A) is an exploded perspective view of a pump body and a first baffle, (B) is a view showing a state before the pump body and the first baffle are combined, and (C) is a view showing a state after the pump body and the first baffle are combined.

[0033] Figure 5 (D) is a view showing the first baffle as viewed from the exhaust port side.

[0034] Figure 6 (A) is a view showing the flow of gas in the first baffle.

[0035] Figure 7 (A) is an exploded perspective view of an oil rotary vacuum pump according to a second embodiment of the present application.

[0036] Figure 8 (A) is a perspective view, and (B) is a sectional view.

[0037] Figure 9 (A) is a second exhaust port of the second embodiment, (B) is a first modification of the second exhaust port, (C) is a second modification of the second exhaust port, and (D) is a third modification of the second exhaust port.

[0038] Figure 10 (A) is a perspective view, and (B) is a sectional view, of the first baffle, the second baffle, and the second pump body of the oil rotary vacuum pump of the third embodiment of the present application.

[0039] Figure 11 (A) is a perspective view, and (B) is a sectional view, of the first baffle, the second baffle, and the second pump body of the oil rotary vacuum pump of the fourth embodiment of the present application.

[0040] Figure 12 (A) is a perspective view, (B) is a perspective view of the first baffle, and (C) is a view as seen from the A direction of (A), of the first baffle, the second baffle, and the second pump body of the oil rotary vacuum pump of the fifth embodiment of the present application.

[0041] Figure 13 An experimental result of comparing the noise of the conventional oil rotary vacuum pump, the oil rotary vacuum pump of the first embodiment of the present application, and the oil rotary vacuum pump of the fifth embodiment of the present application. DETAILED DESCRIPTION

[0042] Hereinafter, an embodiment of the present application will be described with reference to the drawings.

[0043] <First Embodiment>

[0044] Figure 1 (A) is a perspective view, and (B) is a sectional view, of the first baffle, the second baffle, and the second pump body of the oil rotary vacuum pump of the third embodiment of the present application.

[0045] [Structure of Oil Rotary Vacuum Pump]

[0046] The oil rotary vacuum pump 1 of the present embodiment has a housing 10, a driving portion 20, a pump body 30, and a first baffle 70.

[0047] (Housing)

[0048] The housing 10 has a first housing 101 and a second housing 102. The first housing 101 constitutes a main portion of the housing 10, and the driving portion 20 and the pump body 30 are assembled thereto, respectively. The second housing 102 is attached to one end of the first housing 101 (in the X-axis direction in the drawing). The first housing 101 and the second housing 102 are made of a metal material, and are joined to each other by welding or the like. Figure 1The second housing 102 has a storage chamber 13 (see FIG. 2) that stores the pump oil O inside and houses the pump body 30. A liquid level gauge 103 for confirming the liquid surface Ps of the pump oil O in the storage chamber 13 is installed at a prescribed position of the second housing 102. In the present embodiment, the liquid surface Ps of the pump oil O is located at a lower position in the Z-axis direction (negative direction of the Z-axis) than the first baffle 70, but is not limited thereto and can be located at a higher position in the Z-axis direction (positive direction of the Z-axis) than the first baffle 70.

[0049] The housing 10 has an intake pipe 11 and an exhaust pipe 12. The intake pipe 11 is installed in the first housing 101 and connected to a vacuum chamber or the like via an unillustrated intake pipe connection portion. An intake passage 111 that communicates between the intake pipe 11 and the pump body 30 is formed in the first housing 101. The exhaust pipe 12 is an exhaust passage that is installed in the second housing 102 and communicates the storage chamber 13 with the outside air, and exhausts gas G sucked into the device from the outside via the intake pipe 11 by the pump body 30. An unillustrated exhaust pipe connection portion or the like is connected to the exhaust pipe 12.

[0050] (Drive unit)

[0051] The drive unit 20 is constituted by a motor that drives the pump body 30 and a motor housing or the like that houses the above motor, and is installed in the housing 10 (first housing 101). The drive unit 20 has a rotation shaft 21 that extends in the Y-axis direction, and rotates the rotation shaft 21 about its axis. The rotation shaft 21 can also be an axial member that is linked to the drive shaft of the above motor. In this case, the above axial member can be directly connected to the above drive shaft, or can be connected to the drive shaft via a belt, a gear, or the like rotation transmission mechanism. The rotation shaft is rotatably supported by, for example, a slide bearing or the like.

[0052] (Pump body)

[0053] The pump body 30 is constituted by a two-stage Gerotor pump unit. Figure 2 FIG. 4 is an enlarged view of the pump body 30. The pump body 30 has a first pump body 31, a second pump body 32 (pump body), an intermediate body 321, and a side cover 33.

[0054] The first pump body 31 is fixed to the partition wall 112 that constitutes the first housing 101. The intermediate body 321 is fixed between the first pump body 31 and the second pump body 32, and has a penetration hole 322 through which a slide bearing 211 that supports the rotation shaft 21 penetrates. The first pump body 31 has a first pump chamber P1 inside. A first rotary body R1 is rotatably housed in the first pump chamber P1. The first rotary body R1 has a first rotor 41 that is linked to the rotation shaft 21, and a pair of first vanes 51 that are installed so as to be slidable in the radial direction around the first rotor 41.

[0055] The side cover 33 is fixed to the second pump main body 32, whereby a second pump chamber P2 is formed in the inside of the second pump main body 32. A second rotary body R2 is rotatably accommodated in the second pump chamber P2. The second rotary body R2 has a second rotor 42 coupled to the rotary shaft 21 and a pair of second vanes 52 freely slidably installed around the second rotor 42 in the radial direction. The first pump main body 31, the second pump main body 32, and the side cover 33 are fixed to the partition wall 112 via, for example, a plurality of screw members B having an axial direction in the Y-axis direction.

[0056] The pump main body 30 is lubricated by the pump oil O stored in the storage chamber 13. The pump main body 30 is provided with lubrication lines (passages) for supplying the pump oil O to the first pump chamber P1 and the second pump chamber P2, respectively. The above-mentioned lubrication lines communicate the pump oil O between the storage chamber 13 and the pump chambers P1, P2.

[0057] The above-mentioned lubrication lines have a first through-hole L1, a second through-hole L2, a third through-hole L3, and a fourth through-hole L4. In the following description, the first through-hole L1 to the fourth through-hole L4 are collectively referred to as the lubrication lines L, except for cases where they are described separately.

[0058] The first through-hole L1 is formed at a position offset by a prescribed distance from the axis of the rotary shaft 21 in such a manner as to pass through the side cover 33 in the Y-axis direction. Further, the second through-hole L2 is formed at a position offset by the above-mentioned prescribed distance from the axis of the rotary shaft 21 in such a manner as to pass through the second rotor 42 in the Y-axis direction and be able to align with the first through-hole L1 at any rotational position of the second rotor 42.

[0059] The third through-hole L3 is formed at a position offset by the above-mentioned prescribed distance from the axis of the rotary shaft 21 in such a manner as to pass through the intermediate body 321 in the Y-axis direction and be able to align with the second through-hole L2 at any rotational position of the second rotor 42. The formation position of the third through-hole L3 is not particularly limited, but in the present embodiment, it is formed on the upper side (positive direction side of the Z-axis) relative to the direction of gravity than the rotary shaft 21.

[0060] Further, the fourth through-hole L4 is formed at a position offset by the above-mentioned prescribed distance from the axis of the rotary shaft 21 in such a manner as to pass through the first rotor 41 in the Y-axis direction and be able to align with the third through-hole L3 at any rotational position of the first rotor 41.

[0061] By the rotation of the rotors 41, 42, a negative pressure is formed in each of the pump chambers P1, P2, and a pressure difference is generated between the storage chamber 13 and the pump chambers P1, P2. Thereby, the pump oil O stored in the storage chamber 13 is supplied to the first pump chamber P1 and the second pump chamber P2 via the lubrication lines L.

[0062] Further, an oil seal is installed around the rotation shaft 21 between the first pump chamber P1 and the drive section 20. Thereby, the pump oil is prevented from being immersed from the first pump chamber P1 to the drive section 20.

[0063] In the present embodiment, a differential pressure oil supply method is adopted in which, by the rotation of the rotors 41, 42, negative pressure is formed in each of the pump chambers P1, P2, and a pressure difference is generated between the reservoir chamber 13 and the pump chambers P1, P2, whereby the pump oil O is supplied to the pump chambers P1, P2, but it is of course not limited thereto. For example, a forced oil supply method in which the pump oil O is forcibly supplied to the pump chambers P1, P2 by a hydraulic pump not shown can also be adopted.

[0064] A first intake port T1 which communicates with the intake passage 111 and a first exhaust port E1 which penetrates the first cylinder block 31 in the radial direction are formed in the inner peripheral surface of the first pump chamber P1, respectively. The first intake port T1 corresponds to the intake port of the pump main body 30. The first exhaust port E1 can be plural or single. Further, an exhaust valve V' which covers each exhaust port E1 is disposed in the peripheral surface of the first cylinder block 31, respectively. The exhaust valve V' is a check valve of a reed valve type which opens when the pressure in the first exhaust port E1 exceeds the atmospheric pressure, and exhausts the gas together with the pump oil O.

[0065] Each first vane 51 is disposed in a pair of grooves which are formed radially at 180-degree intervals around the first rotor 41, and a plurality of springs 61 which penetrate the first rotor 41 and the rotation shaft 21 in the radial direction are installed in a pre-compressed state between these vanes 51. Further, the first rotation body R1 also functions as a sliding section which slides each first vane 51 on the inner wall surface of the first pump chamber P1 by rotating the first rotor 41, and transports the gas from the first intake port T1 to the first exhaust port E1.

[0066] Figure 3 For Figure 2 A sectional view in the direction of the [A] - [A] line. The second pump chamber P2 is of the same structure as the first pump chamber P1, and is formed in a cylindrical shape eccentric to the rotation shaft 21, but the volume of the second pump chamber P2 is formed to be smaller than that of the first pump chamber P1. A second intake port T2 and a second exhaust port E2 are formed in the inner peripheral surface N2 of the second pump chamber P2, respectively, and the gas is transported from the second intake port T2 to the second exhaust port E2.

[0067] The second intake port T2 communicates with the first exhaust port E1 via a communication passage 121 which is formed across the first pump main body 31, the intermediate body 321, and the second cylinder block 32. The second exhaust port E2 can be plural or single. The second exhaust port E2 corresponds to the exhaust port of the pump main body 30, and penetrates the second pump main body 32 in the radial direction. Further, a recessed surface portion 320 (refer to FIG. 6) is formed by cutting a part of the peripheral surface of the second pump main body 32, and an exhaust valve V" which covers the second exhaust port E2 is disposed in the recessed surface portion 320. The exhaust valve V" is a check valve of a reed valve type which opens when the pressure in the second exhaust port E2 exceeds the atmospheric pressure, and exhausts the gas together with the pump oil O.Figure 4 The pump body 320 is equipped with an exhaust valve V covering the second exhaust port E2 and a valve clamping member 34 that presses the exhaust valve V toward the second pump body 32. The concave portion 320 is, for example, a plane orthogonal to the Z-axis direction, and the second exhaust port E2 is formed to penetrate the bottom of the concave portion 320. In addition, a first baffle 70 (described later) covering the exhaust valve V and the valve clamping member 34 is provided on the second pump body 32.

[0068] Each second blade 52 is disposed in a pair of slots radially formed at 180-degree intervals around the second rotor 42, and a spring 62, which passes radially through the second rotor 42 and the rotating shaft 21, is installed between these blades 52 in a pre-compressed state.

[0069] Each second blade 52 is subjected to centrifugal force generated by the rotation of the second rotor 42 and the elastic force of the spring 62, and is forced radially outward of the second rotor 42, with the tip of each blade 52 pressed against the inner wall surface of the second pump chamber P2. Furthermore, the tip of each blade 52 functions as a sliding portion sliding against the inner wall surface of the second pump chamber P2, transporting gas from the second inlet port T2 to the second exhaust port E2. At this time, the second rotor 42 is eccentrically positioned relative to the second pump chamber P2, therefore, the protrusion of the second blades 52 changes with the rotational position of the second rotor 42, thus changing the volume of the gas transport space. The second exhaust port E2 is formed in the region with the smallest volume of the transport space, so the gas is compressed and guided to the second exhaust port E2. The gas guided to the second exhaust port E2 is discharged from the exhaust pipe 12 via the exhaust valve V, the first baffle 70, and the storage chamber 13.

[0070] The exhaust valve V is a reed valve-type check valve that prevents gas G and pump oil O from flowing back from the second exhaust port E2 into the pump chamber P2. When the pressure in the second exhaust port E2 exceeds atmospheric pressure, the valve opens, releasing gas G along with pump oil O. The valve clamping member 34 is positioned overlapping the exhaust valve V when viewed from the Z-axis direction, and its shape is warped towards the positive Z-axis direction when viewed from the Y-axis direction. Therefore, when the exhaust valve V opens, it can prevent the exhaust valve V from opening excessively towards the positive Z-axis direction.

[0071] The exhaust valve V and the valve clamping member 34 are jointly mounted on the second pump body 32 by screw N1. In this embodiment, as... Figure 4 As shown in (A), a through hole V1 for screw N1 to pass through is provided at one end of the exhaust valve V, and a through hole 341 for screw N1 to pass through is provided at one end of the valve clamping member 34. A first screw hole 323 for screw N1 to be screwed into is provided in the concave part 320 of the second pump 32. Screw N1 passes through the exhaust valve V and the valve clamping member 34 in the Z-axis direction and is screwed into the first screw hole 323, so that the exhaust valve V is clamped between the valve clamping member 34 and the concave part 320.

[0072] Further, the valve presser 34 is formed with a through-hole 342 through which a screw N2 for fixing a first baffle 70 to be described later to a concave portion 320 of the second pump main body 32 is inserted, and the concave portion 320 is formed with a second screw hole 324 into which the screw N2 is screwed.

[0073] (First Baffle)

[0074] Figure 4 FIG. 1 is a perspective view of a first baffle 70 and a pump main body 30 in an oil rotary vacuum pump 1, (A) is an exploded perspective view of each component between the pump main body 30 and the first baffle 70, (B) is a perspective view before the pump main body 30 and the first baffle 70 are combined, and (C) is a perspective view of a state after the pump main body 30 and the first baffle 70 are combined. Figure 5 FIG. 2 is a perspective view of the first baffle 70 viewed from a second exhaust port E2 side. Further, Figure 6 FIG. 3 is a schematic side sectional view showing a flow of gas G in the first baffle 70.

[0075] The first baffle 70 has a first housing portion 71, a first discharge port 72, and a first wall portion 73. The first housing portion 71 is provided to the pump main body 30 and covers the exhaust valve V. The first discharge port 72 is provided to the first housing portion 71 and discharges gas (gas) and pump oil O discharged from the second exhaust port E2 (hereinafter also referred to as exhaust port E2) to the reservoir chamber 13. The first wall portion 73 is provided to the first housing portion 71 and divides a space between the exhaust port E2 and the first discharge port 72 into a plurality of space portions W1, W2. In the present embodiment, the first baffle 70 is composed of, for example, an aluminum die cast, but is not limited thereto and can be composed of other metal materials, resin materials, or the like.

[0076] The first housing portion 71 forms an internal space W in which the valve presser 34 and the exhaust valve V are accommodated, and has a top surface portion 711 which is a surface facing the valve presser 34 and the exhaust valve V in the Z-axis direction, and a peripheral surface portion 712 which is provided around the top surface portion 711 and abuts against the second pump main body 32 (the concave portion 320) (refer to FIG. 1). Figures 3-6

[0077] The top surface portion 711 has a through-hole 711A through which a screw N2 for fixing the first baffle 70 to the second pump main body 32 (the concave portion 320) is inserted. Further, as shown in Figure 6 FIG. 3, the first discharge port 72 is provided to the top surface portion 711 in the Z-axis direction. In the present embodiment, the first discharge port 72 is two, but is not limited thereto and can be one or more than three. Further, the first discharge port 72 can be provided to the peripheral surface portion 712.

[0078] ​The internal space W is configured to be filled with pump oil (lubricating oil) O that is discharged from the exhaust port E2 together with the gas G. The peripheral surface portion 712 is formed to follow the shape of the recessed surface portion 320 when the first housing portion 71 is fixed to the second pump main body 32. Thus, the gas G and the pump oil O discharged from the exhaust port E2 can be inhibited from leaking out from between the peripheral surface portion 712 and the recessed surface portion 320 in the internal space W.

[0079] The first wall portion 73 includes a vertical wall portion 731 that extends in the Z-axis direction from the top surface portion 711 toward the bottom portion side (exhaust valve V side) of the recessed surface portion 320. The vertical wall portion 731 is formed to be parallel to the Y-axis direction and separates the internal space W into a first internal space W1 on the exhaust port E2 side and a second internal space W2 on the first discharge port 72 side when viewed in the Z-axis direction. A lower end portion 731A (see FIG. 6) of the vertical wall portion 731, which is an end portion on the recessed surface portion 320 side, faces the upper surface of the valve presser 34 with a prescribed gap therebetween. That is, the gas G and the pump oil O discharged from the exhaust port E2 to the first internal space W1 flow to the second internal space W through the prescribed gap and are discharged from the first discharge port 72 (see FIG. 6). Figure 6 Figure 6 In other words, the vertical wall portion 731 forms a communication passage M1 (gap) that communicates the first internal space W1 and the second internal space W2, and the gas G and the pump oil O pass through the communication passage M1 to be discharged from the first discharge port 72. Further, as shown in FIG. 6, the height of the communication passage M1 in the Z-axis direction is smaller (lower) than the heights of the first internal space W1 and the second internal space W2 in the Z-axis direction. Figure 6

[0080] Further, the communication passage M1 is not limited to the example of the gap formed between the lower end portion 731A of the vertical wall portion 731 and the upper surface of the valve presser 34, and may, for example, be a single or a plurality of holes that penetrate the vertical wall portion 731 in the X-axis direction, or may be a notch portion provided to a portion of the lower end portion 731A of the vertical wall portion 731. Alternatively, a tubular passage member that is installed on the outside of the first housing portion 71 can be used to communicate between the first internal space W1 and the second internal space W2. In this case, the passage member described above functions as the communication passage M1.

[0081] Further, in the present embodiment, the vertical wall portion 731 is formed to be perpendicular to the top surface portion 711 (parallel to the Z-axis direction), but is not limited thereto and can be inclined at a prescribed angle with respect to the Z-axis direction. As shown in FIG. 6, the vertical wall portion 731 is preferably provided at a height position that intersects a virtual line segment S that connects between the exhaust port E2 and the first discharge port 72. Figure 3

[0082] ​​​In the present embodiment, the first wall portion 73 further includes a plurality of wall surface portions 732 extending in a direction intersecting the vertical wall portion 731. In the present embodiment, the plurality of wall surface portions 732 extend from the vertical wall portion 731 toward a direction orthogonal to the vertical wall portion 731 (X-axis direction), dividing the first internal space Wl in a direction orthogonal to the wall surface portions 732 (Y-axis direction). Each wall surface portion 732 extends in the Z-axis direction from the top surface portion 711 toward the bottom side of the concave portion 320 (exhaust valve V side), like the vertical wall portion 731. Each wall surface portion 732 is formed parallel to the X-axis direction, dividing the first internal space Wl into a plurality when viewed in the Z-axis direction. Each wall surface portion 732 functions as a rib reinforcing the top surface portion 711 by being formed integrally with the top surface portion 711 and the vertical wall portion 731. Typically, the lower end portion 732A of each wall surface portion 732 can be formed on the same plane as the lower end portion 731A of the vertical wall portion 731, partially provided with a tapered portion (not shown) for avoiding contact with the valve pressing member 34, as shown in FIG. 9. Figure 6 Figure 6

[0083] In the present embodiment, four wall surface portions 732 are provided, but the number is not limited to this and can be three or more than five. In addition, a single wall surface portion can be provided. In the present embodiment, the lower end portion 732A of each wall surface portion 732 is the same height as the lower end portion 731A of the vertical wall portion 731, but the height is not limited to this and can be higher or lower than the lower end portion 731A of the vertical wall portion 731. Furthermore, each wall surface portion 732 can be provided not only in the first internal space Wl but also in the second internal space W2.

[0084] (Working of the oil rotary vacuum pump)

[0085] In the oil rotary vacuum pump 1 of the present embodiment configured as described above, the first rotor 41 is rotated in the first pump chamber P1 by the rotational driving force of the driving portion 20 transmitted via the rotary shaft 21. Then, the gas is sucked, compressed, and delivered to the first exhaust port E1 by the first vane 51 sliding on the inner wall surface of the first pump chamber P1.

[0086] Here, in a case where the pressure of the gas delivered to the first exhaust port E1 exceeds a prescribed value (atmospheric pressure), the gas is released to the storage chamber 13 via the exhaust valve V' and discharged from the exhaust pipe 12. In addition, in a case where the pressure of the gas discharged from the first exhaust port E1 is equal to or less than the prescribed value (atmospheric pressure), the exhaust valve is not opened and the gas is introduced to the second pump chamber P2 via the communication passage 121.

[0087] ​​The second rotor 42 is also rotated within the second pump chamber P2 by the rotational driving force of the driving section 20 transmitted via the rotation shaft 21. Then, the gas is sucked from the second intake port T2, compressed by the second vane 52 sliding on the inner wall surface of the second pump chamber P2, and then delivered to the exhaust port (second exhaust port) E2, and discharged to the storage chamber 13 via the exhaust valve V and the first baffle 70.

[0088] (Action of the first baffle)

[0089] Here, as shown in FIG. 6, the exhaust valve V is opened, and the gas G and the pump oil O discharged from the exhaust port E2 are discharged into the first inner space Wl. The gas G discharged into the first inner space Wl collides repeatedly not only with the top surface portion 711 and the circumferential surface portion 712 but also with the first wall portion 73 as indicated by the arrow in FIG. 6, and then guided to the first discharge port 72 via the communication passage Ml and the second inner space W2. Thus, the sound generated from the first discharge port 72 can be reduced. Figure 6 Figure 6

[0090] That is, in the first baffle 70, the vertical wall portion 731 (first wall portion 73) that divides the space between the exhaust port E2 and the first discharge port 72 into a plurality of space portions (first inner space Wl, second inner space W2) is provided, and thus the gas G discharged from the exhaust port E2 is difficult to reach the first discharge port 72 directly. Thus, the gas G is likely to collide with the vertical wall portion 731 (first wall portion 73) and the like, and the impact of the sound generated from the second exhaust port E2 is dispersed and attenuated, and the sound generated from the first discharge port 72 is reduced.

[0091] That is, in the present embodiment, the structure in which the pump oil (lubricating oil) O is housed in the inner space W is adopted, and thus the pump oil O filled in the inner space W becomes a resistance for the gas G discharged from the exhaust port E2, and thus the sound generated from the first discharge port 72 is reduced. Further, the gas G is diffused as bubbles inside the pump oil O, and the bubbles collide repeatedly with the inner wall of the first baffle 70, and thus are micronized, and thus the sound generated from the first discharge port 72 is efficiently reduced along with the rupture of these bubbles.

[0092] In particular, in the present embodiment, the vertical wall portion 731 and the plurality of wall surface portions 732 are provided in the inner space W, and thus the number of collisions of the gas G with these wall surfaces is increased. Thus, the bubbles of the gas G are likely to be dispersed or disappear, and thus the sound reduction effect can be improved.

[0093] ​​Further, the exhaust port E2 and the first discharge port 72 are blocked by the vertical wall portion 731, so sound generated by the exhaust port E2 is difficult to reach the first discharge port 72 directly. Also, the communication passage M1 functions to throttle the flow path of the gas G, and can suppress the generation of large gas clumps by accelerating the flow rate of the gas. Thus, the reduction of sound generated by the first discharge port 72 can be further promoted.

[0094] Further, in order to reduce the impact sound of oil and the vane at the time of reaching the pressure, there is a method of reducing the impact sound by causing a slight leakage to flow out inside the pump. In this case, bubbles are always discharged from the exhaust port. According to the present embodiment, the breaking sound of the bubbles that are always generated can also be reduced. In this case, sound reduction is also achieved by colliding with and reflecting from the first wall portion 73 (the vertical wall portion 731, the wall surface portion 732) in the same manner. Further, the pump oil and the gas can be separated by lengthening the flow path of the discharged pump oil and the gas, and the discharge of oil droplets from the pump exhaust port can be reduced by discharging the pump oil from the exhaust port in the direction opposite to the position of the exhaust port.

[0095] <SECOND EMBODIMENT>

[0096] Figure 7 A perspective view of an oil rotary vacuum pump 1A according to a second embodiment of the present application, Figure 8 A diagram showing the first baffle 70, the second baffle 80, and the second pump body 32 in the oil rotary vacuum pump 1A described above, (A) is a perspective view, and (B) is a cross-sectional view. Hereinafter, the structure different from the first embodiment will be mainly described, the same reference numerals are attached to the same structure as the first embodiment, and the description thereof will be omitted or simplified.

[0097] In the present embodiment, the second baffle 80 is installed on the concave portion 320 of the second pump body 32 in addition to the first baffle 70, unlike the first embodiment. In the present embodiment, the second baffle 80 is provided on the upper peripheral edge of the top surface portion 711 of the first baffle 70.

[0098] The second baffle 80 has a second housing portion 81 and a second discharge port 82. The second housing portion 81 is provided on the top surface portion 711 of the first baffle 70, covering the first discharge port 72. The second discharge port 82 is provided on the second housing portion 81, discharging the gas G and the pump oil O discharged from the first discharge port 72 to the storage chamber 13. The second baffle 80 forms a second passage portion (passage portion) 83 that communicates between the first discharge port 72 and the second discharge port 82 by overlapping the first baffle 70. Further, in the present embodiment, the second baffle 80 is composed of an aluminum die cast like the first baffle 70, but is of course not limited thereto, and can be composed of other metal materials, resin materials, or the like.

[0099] The second housing portion 81 has a top surface portion 811 which is a surface facing the top surface portion 711 of the first baffle 70 in the Z-axis direction, and a peripheral surface portion 812 which is provided around the top surface portion 811. The top surface portion 811 is formed in a rectangular shape having a long side in the X-axis direction. A passage portion 83 is formed between the top surface portion 711 of the first baffle 70 and the top surface portion 811 and the peripheral surface portion 812 of the second baffle 80. The passage portion 83 is configured to be able to accommodate the pump oil (lubricating oil) O discharged from the first discharge port 72, and in the present embodiment, the passage portion 83 is filled with the pump oil O.

[0100] The top surface portion 811 has a through-hole 811A through which a screw N2 for fixing the first baffle 70 and the second baffle 80 to the second pump main body 32 is passed. As shown in Figure 7 , the through-hole 811A is provided at a position overlapping with the through-hole 711A provided in the top surface portion 711 of the first baffle 70, the through-hole 342 provided in the valve presser 34, and the second screw hole 324 provided in the second pump main body 32 (the concave portion 320), respectively. Thus, the second baffle 80 can be fixed to the second pump main body 32 by the screw N2.

[0101] As shown in Figure 8 (A) and (B), in the present embodiment, the top surface portion 711 of the first baffle 70 has a facing surface portion 711B facing the bottom of the concave portion 320 when viewed in the Z-axis direction, and an outer top surface portion 711C provided in the peripheral surface portion 712 and disposed outside the inner space W when viewed in the Z-axis direction. The outer top surface portion 711C is formed in the same plane as the facing surface portion 711B, but is not limited thereto. In addition, the outer top surface portion 711C can be provided in the peripheral surface portion 812 of the second baffle 80, not in the top surface portion 711 of the first baffle 70.

[0102] The second discharge port 82 is provided in the top surface portion 811. In the present embodiment, the second discharge port 82 is one long hole having a long axis in the Y-axis direction, but is not limited thereto, and can be configured by a plurality of through-holes as described later. Further, as described later, the second discharge port 82 can be provided in the peripheral surface portion 812, the outer top surface portion 711C of the first baffle 70 (see Figure 10 , Figure 11 ).

[0103] The second discharge port 82 is provided at a position not overlapping with the first discharge port 72 and facing the outer top surface portion 711C when viewed in the Z-axis direction. As shown in Figure 8 (B), the first discharge port 72 and the second discharge port 82 are formed to have a longer interval distance X1 in the X-axis (horizontal) direction than an interval distance X2 in the X-axis direction between the exhaust port E2 and the first discharge port 72.

[0104] In the present embodiment, by further providing the second baffle 80, the gas G (bubbles) discharged from the second exhaust port E2 repeatedly collide not only within the first baffle 70 but also within the passage portion 83. Thus, the impact of the sound generated from the second discharge port 82 is dispersed and attenuated, and thus the sound generated from the second discharge port 82 is reduced.

[0105] Further, since the interval distance Xl in the X-axis (horizontal) direction between the first discharge port 72 and the second discharge port 82 is formed longer than the interval distance X2 in the X-axis direction between the exhaust port E2 and the first discharge port 72, the impact and pulsation of the pump oil O and the gas G discharged from the first discharge port 72 is rectified. That is, the distance in the X-axis direction between the first discharge port 72 and the second discharge port 82 is elongated, and thus the discharged gas G and pump oil O are separated toward the upper side and the lower side, respectively, as they flow and time passes, and rectification is achieved. Further, the impact and pulsation of the gas G discharged instantaneously is reduced by the flow when reaching the second discharge port 82.

[0106] Further, in the present embodiment, the structure in which the oil (pump oil) O is housed within the passage portion 83 is adopted as in the first embodiment, and thus the sound generated from the gas G discharged from the first discharge port 72 is reduced by the resistance formed by the pump oil O filling the passage portion 83.

[0107] In addition, in the second baffle 80, a wall portion that separates the first discharge port 72 and the second discharge port 82 when viewed in the Z-axis direction can be provided as in the first wall portion 73 in the first baffle 70. Thus, the number of collisions of the gas G discharged from the first discharge port 72 is further increased, and thus the sound generated from the second discharge port 82 can be further reduced.

[0108] <Modification Examples>

[0109] Figure 9 The modification examples of the oil rotary vacuum pump 1A of the second embodiment of the present application are as follows: (A) is the second discharge port 82 of the second embodiment, (B) is a first modification example of the second discharge port 82, (C) is a second modification example of the second discharge port 82, and (D) is a third modification example of the second discharge port 82. Hereinafter, the structures different from the second embodiment will be mainly described, the same reference numerals are attached to the same structures as those of the second embodiment, and the description thereof will be omitted or simplified.

[0110] In the present embodiment, the shape of the second discharge port 82 is different from that of the second embodiment. In the second embodiment, as shown in (A) of FIG. 10, the second discharge port 82 is one long hole shape, but Figure 9 in the present embodiment, as shown in (B) of FIG. 10, the second discharge port 82 is a plurality of long holes. In the present embodiment, the second discharge port 82 is formed of a plurality of long holes, and thus the impact of the sound generated from the second discharge port 82 is further reduced. Figure 9The second outlet 82A of the second baffle 80A shown in (B) is an arrangement of multiple holes 821A, which are holes arranged along the Y-axis and have an elongated hole shape (slit-like) in the X-axis direction. Furthermore, as... Figure 9 The second outlet 82B of the second baffle 80B shown in (C) is an arrangement of multiple holes 821B, which are arranged in multiple rows (mesh) along the Y-axis direction. Furthermore, as... Figure 9 The second outlet 82C of the second baffle 80C shown in (D) is an arrangement of multiple holes 821C, which are hexagonal holes arranged in multiple rows (configured in a honeycomb pattern) along the Y-axis direction.

[0111] In this variation, such as Figure 9 As in (B) to (D), the second outlets 82A to 82C are an arrangement of multiple holes 821A to 821C, thus further reducing the sound generated from the second outlet 82 more efficiently. In other words, the sound generated from the second outlet 82 is the sound of gas clumps breaking when large gas clumps float from the pump oil and are released into the atmosphere. Therefore, by using a shape that can refine the gas clumps, such as a slit, mesh, or honeycomb shape, as in this modified example, instead of using a large hole, the sound generated from the second outlet 82 can be reduced.

[0112] <Third Implementation Method>

[0113] Figure 10 The figures shown are perspective views (A) and cross-sectional views (B) of the first baffle 70, second baffle 80D, and second pump body 32 of the oil rotary vacuum pump 1D according to the third embodiment of the present invention. Hereinafter, the structures different from those in the first embodiment will be described in detail, while the same reference numerals will be used for the same structures as in the first embodiment, and their descriptions will be omitted or simplified.

[0114] In this embodiment, the difference from the second embodiment is that the second outlet 82D of the second baffle 80D is provided on the peripheral surface 812.

[0115] In this embodiment, the second outlet 82D is formed on the side of the second baffle 80D, which is the part furthest from the first outlet 72 in the X-axis direction. However, it is not limited to this and may also be formed on the side of the second baffle 80D on the long side.

[0116] In the present embodiment, the second discharge port 82D is provided at the peripheral surface portion 812 of the second baffle 80D, and thus the sound generated from the second discharge port 82D can be reduced. That is, the sound generated from the second discharge port 82D is the breaking sound of the lump of gas G when the large lump of gas is floated up from the pump oil and released into the atmosphere, and thus the gas needs to be fined in order to reduce the breaking sound. In the present embodiment, by providing the peripheral surface portion 812 at the second discharge port 82D, the gas G is pushed out to the outside of the second baffle 80D by the pump oil O, and thus the breaking sound of the lump of gas when the large lump of gas is floated up from the pump oil and released into the atmosphere can be reduced.

[0117] In addition, a wall portion that separates the first discharge port 72 and the second discharge port 82D when viewed in the Z-axis direction can be provided at the second baffle 80D. Thus, the number of collisions of the gas G discharged from the first discharge port 72 is further increased, and thus the sound generated from the second discharge port 82D can be further reduced.

[0118] <Fourth Embodiment>

[0119] Figure 11 To show the first baffle 70, the second baffle 80E, and the second pump body 32 in the oil rotary vacuum pump 1E of the fourth embodiment of the present application, (A) is a perspective view, and (B) is a sectional view.

[0120] Hereinafter, the structure different from the first embodiment will mainly be described, the same reference numerals are attached to the same structure as the first embodiment, and the description thereof will be omitted or simplified.

[0121] In the present embodiment, the second discharge port 82E is provided at the bottom surface (the outer top surface portion 711C) of the second baffle 80E, which is different from the second and third embodiments.

[0122] In the present embodiment, the second discharge port 82E is provided at the bottom surface of the second baffle 80E, and the gas G and the pump oil O are discharged to the lower side (the negative direction of the Z-axis) from the bottom surface. The second discharge port 82E is formed in a long hole shape extending in the Y-axis direction.

[0123] In the present embodiment, the second discharge port 82E is provided on the bottom surface of the second baffle 80E, and thus the sound generated from the second discharge port 82E can be reduced. That is, the sound generated from the second discharge port 82E is the breaking sound of the large gas mass when the large gas mass is floated from the pump oil O and released into the atmosphere, and thus in order to reduce the breaking sound, the gas needs to be fined. In the present embodiment, by providing the second discharge port 82E on the bottom surface, the gas G is pushed out to the outside of the second baffle 80E by the pump oil O, and thus the breaking sound of the gas mass when the large gas mass is floated from the pump oil and released into the atmosphere can be reduced.

[0124] Further, the second discharge port 82E is not limited to the case where it is formed in the shape of an elongated hole extending in the Y-axis direction, and can be an arrangement of a plurality of hole portions. By this, the gas G is fined, and thus the sound discharged from the second discharge port 82E can be reduced.

[0125] Further, in the present embodiment, a wall portion that separates the first discharge port 72 and the second discharge port 82E when viewed in the Z-axis direction can be provided in the passage portion 83 of the second baffle 80E. By this, the number of collisions of the gas G discharged from the first discharge port 72 is further increased, and thus the sound generated from the second discharge port 82E can be further reduced.

[0126] < Fifth Embodiment >

[0127] Figure 12 To show the first baffle 70F, the second baffle 80F, and the second pump body 32 in the oil rotary vacuum pump 1F of the fifth embodiment of the present application, (A) is a perspective view, (B) is a perspective view of the first baffle 70F, and (C) is a view as viewed from the arrow A of (A). Hereinafter, mainly the structure different from the first embodiment will be described, the same reference numerals are attached to the same structure as the first embodiment, and the description thereof will be omitted or simplified.

[0128] In the present embodiment, the second discharge port 82F of the second baffle 80F is provided on the bottom surface (the outer top surface portion 711C) unlike the second embodiment and the third embodiment. The second discharge port 82F is formed in the vicinity of the peripheral surface portion 712 of the first baffle 70F (see (B) of FIG. 12). Figure 12

[0129] Further, in the present embodiment, the second baffle 80F has the second wall portion 84 unlike the fourth embodiment. Figure 12 ​The arrow of (C) indicates the flow of the gas. The second wall portion 84 is provided in the housing portion 81 to divide the passage portion 83 into a plurality of space portions (a third internal space W3, a fourth internal space W4). The second wall portion 84 extends from the top surface portion 811 toward the top surface portion 711 of the first baffle 70F. The second wall portion 84 is formed in an L shape when viewed from the direction orthogonal to the top surface portion 811 (Z-axis direction) and is provided so as to surround the second discharge port 82F (see (C) of FIG. 8). Figure 12

[0130] The second wall portion 84 is provided so that the flow direction of the gas discharged from the first discharge port 72 in the passage portion 83 becomes at least two directions. In the present embodiment, as shown in (C) of FIG. 8, the second wall portion 84 has a first blocking portion 841 provided between the first discharge port 72 and the second discharge port 82F when viewed from the Z-axis direction, and a second blocking portion 842 provided in the first blocking portion 841 and formed so as to surround the second discharge port 82F with the first blocking portion 841 and the peripheral surface portion 812. The first blocking portion 841 and the second blocking portion 842 are provided so as to block the second discharge port 82F when viewed from the peripheral surface portion 812 side of the side where the first discharge port 72 is provided. Figure 12

[0131] When the oil rotary vacuum pump 1F is driven, the gas discharged from the first discharge port 72 flows in the direction of the arrow B through the third internal space W3 formed by the second wall portion 84, and thereafter, turns in the direction of the arrow C through the communication passage M2 that communicates the third internal space W3 and the fourth internal space W4, enters the fourth internal space W4 divided by the second wall portion 84 and including the second discharge port 82F, and is discharged from the second discharge port 82F.

[0132] The communication passage M2 is a gap formed between the top end portion of the second blocking portion 842 and the peripheral surface portion 812. The flow path width of the communication passage M2 is narrower than the passage width of the internal spaces W3, W4 through which the gas flows in the directions of the arrows B and C. In addition, the communication passage M2 can also be a through-hole provided in the second blocking portion 842 to communicate between the third internal space W3 and the fourth internal space W4.

[0133] As described above, according to the present embodiment, the flow path length from the first discharge port 72 to the second discharge port 82F can be greatly extended by the second wall portion 84, and thus the number of collisions of the gas discharged from the first discharge port 72 in the passage portion 83 can be increased, whereby the sound reduction effect by the second baffle 80F can be further improved.

[0134] Further, according to the present embodiment, the flow rate of the gas is accelerated by the second wall portion 84 forming a throttle portion (communication passage M2) of the gas flow path, and thus the generation of a large gas clump can be suppressed. Thus, the sound generated from the second discharge port 82 can be further reduced.​​

[0135] Here, the use of the oil-rotary vacuum pump 1 of the first embodiment is described. Figure 13 The noise level of the oil-rotary vacuum pump of the above embodiment is described. Figure 13 One experimental result of a comparison of the noise of the existing oil-rotary vacuum pump 1', the oil-rotary vacuum pump 1 of the first embodiment of the present application, and the oil-rotary vacuum pump 1F of the fifth embodiment.

[0136] Here, the existing oil-rotary vacuum pump 1' is a structure without the first wall portion 73 of the oil-rotary vacuum pump 1 of the first embodiment. In addition, 50 Hz and 60 Hz indicate the power frequency.

[0137] As shown in FIG. 8, in the oil-rotary vacuum pump 1, about 4 dB of noise was confirmed to be reduced at 50 Hz, and about 2.5 dB of noise was confirmed to be reduced at 60 Hz, compared with the existing oil-rotary vacuum pump 1'. Further, in the oil-rotary vacuum pump 1F, about 1.0 dB of noise was confirmed to be reduced at 50 Hz, and about 0.8 dB of noise was confirmed to be reduced at 60 Hz, compared with the oil-rotary vacuum pump 1. Figure 13

[0138] The above describes the embodiments of the present application, and the present application is not limited to the above-described embodiments, and of course can be variously changed.

[0139] For example, in the above-described embodiments, only the first baffle 70 on the second-stage side of the two-stage oil-rotary vacuum pump was described, but the same structure can be applied to the first-stage side.

[0140] In the above-described embodiments, the example of the two-stage oil-rotary vacuum pump was described, and of course is not limited thereto, and can be applied to a single-stage oil-rotary vacuum pump. In addition, the present application can be similarly applied to a two-stage oil-rotary vacuum pump having a different structure from the above-described embodiments.

[0141] In addition, the structures of each of the embodiments and the modified examples can be applied to different embodiments, not only to the embodiments and the modified examples thereof. For example, the shape of the first discharge port 72 of the oil-rotary vacuum pump 1 of the first embodiment can be made into the shape shown in (B) to (D) of the modified example, and of course is not limited thereto. Figure 9

[0142] Explanation of Reference Numerals

[0143] 1, 1A, 1D, 1E, 1F: Oil-rotary vacuum pump;

[0144] 10: Housing;

[0145] 12: Exhaust pipe (exhaust passage);​​

[0146] 13: storage chamber

[0147] 20: drive section

[0148] 21: rotation shaft

[0149] 30: pump main body

[0150] 31: first pump main body

[0151] 32: second pump main body

[0152] 70, 70A: first baffle

[0153] 71: first housing section

[0154] 72: first discharge port

[0155] 73: first wall section

[0156] 731: vertical wall section

[0157] 732: wall surface section

[0158] 80, 80A-80F: second baffle

[0159] 81: second housing section

[0160] 82, 82A-82F: second discharge port

[0161] 83: passage section

[0162] 84: second wall section

[0163] E2: second exhaust port

[0164] G: gas (bubbles)

[0165] O: pump oil

[0166] P1: first pump chamber

[0167] P2: second pump chamber

[0168] T1: first intake port

[0169] V: exhaust valve

Claims

1. An oil rotary vacuum pump, comprising: The pump body has an air inlet, an air outlet, a pump chamber for conveying gas from the air inlet to the air outlet, and an exhaust valve disposed at the air outlet, the exhaust valve preventing gas from flowing back from the air outlet to the pump chamber; The housing has a storage chamber and an exhaust passage that connects the storage chamber to the outside air, the storage chamber housing the pump body and storing lubricating oil supplied to the pump chamber; as well as The first baffle has: a first housing portion disposed on the pump body, forming an internal space covering the exhaust valve; and a first outlet disposed on the first housing portion, for discharging gas and lubricating oil discharged from the exhaust outlet into the storage chamber; And a first wall portion, which is disposed in the first housing portion, divides the internal space between the exhaust port and the first outlet port into a first internal space on the exhaust port side and a second internal space on the first outlet port side. The internal space is configured to be filled with the lubricating oil discharged from the vent. The first wall portion includes: a vertical wall portion extending downward from the top surface of the first housing portion, and a plurality of wall portions extending in a direction intersecting the vertical wall portion and dividing the first internal space into a plurality of spaces.

2. The oil rotary vacuum pump according to claim 1, wherein, It also has a second baffle disposed in the first housing portion. The second baffle has a second housing portion covering the first outlet and a second outlet disposed in the second housing portion. The second outlet discharges the gas and the lubricating oil discharged from the first outlet to the storage chamber. The second baffle overlaps the first baffle to form a channel portion that connects the first outlet and the second outlet.

3. The oil rotary vacuum pump according to claim 2, wherein, The channel portion is configured to be filled with the lubricating oil discharged from the first outlet.

4. The oil rotary vacuum pump according to claim 2, wherein, The horizontal distance between the first outlet and the second outlet is longer than the horizontal distance between the exhaust port and the first outlet.

5. The oil rotary vacuum pump according to claim 4, wherein, The second outlet is located on the top, side, or bottom surface of the second housing.

6. The oil rotary vacuum pump according to claim 5, wherein, The second outlet is a single or multiple holes arranged together.

7. The oil rotary vacuum pump according to claim 2, wherein, The second baffle also has a second wall portion disposed in the second housing portion and dividing the channel portion into multiple spatial portions.

8. The oil rotary vacuum pump according to claim 7, wherein, The second wall portion is disposed in the second housing portion such that the flow direction of the gas in the channel portion is in at least two directions.

9. The oil rotary vacuum pump according to any one of claims 1 to 7, wherein, The storage chamber stores the lubricating oil at the liquid level level of the first baffle.

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