JP6340556B2 - Biaxial rotary pump - Google Patents

Description

  In the present invention, two rotors supported in a cantilever manner by two rotating shafts arranged in parallel and rotating in opposite directions rotate in a non-contact manner in the cylinder chamber, and in the cylinder chamber, air is sucked from an intake port and exhausted. The present invention relates to a biaxial rotary pump provided to discharge from a mouth.

  Examples of the biaxial rotary pump include a roots pump and a claw pump. These biaxial rotary pumps have a vacuum suction function for generating a reduced-pressure vacuum state and a blower discharge function for generating a pressurized blown state, and both functions can be used simultaneously. For example, in paper handling processes such as printing factories and paper factories, by using them simultaneously as a vacuum pump and blower (blower), suitable paper by paper handling using the blower discharge function and suction conveyance using the vacuum suction function Feeding can be performed. Of course, only one of the vacuum suction function and the air exhaust function can be used.

  As a conventional biaxial rotary pump, for example, a cylinder includes a peripheral wall portion of the cylinder, one side plate portion, and the other side plate portion, and a gear box has a peripheral wall portion of the cylinder of the other side plate portion. A structure (housing) that is provided on the side opposite to the side and includes a peripheral wall portion of the gear box, one bearing portion, and the other bearing portion, and is configured integrally with the cylinder and the gear box. Is divided between the side plate portion of the cylinder and the peripheral wall portion of the cylinder, and is divided between the one bearing portion and the other bearing portion, so that the end wall on the exhaust port side (one side plate portion) The present applicant has proposed a three-part structure of an intermediate main body and a gear-side main body (see Patent Document 1). In this biaxial rotary pump, two rotors supported in a cantilever manner by two rotating shafts arranged in parallel and rotating in opposite directions rotate in a non-contact manner in the cylinder chamber, and air is sucked into the cylinder chamber from an intake port. And it is provided so that it may exhaust from an exhaust port.

  Further, as a conventional biaxial rotary pump, in order to provide means for simultaneously generating positive pressure and negative pressure with a single-stage pump, a vacuum connection part, a pressure connection part and a charging connection part are provided in the housing. At least two three-blade rotors disposed in the pump chamber, the rotors rotating in opposite directions about parallel axes spaced from each other and meshing in a non-contacting manner, A pressure-suction pump (see Patent Document 2) that defines cells separated from each other together with the peripheral wall of the pump chamber is disclosed. According to this, two recesses (auxiliary intake ports) that are open to the atmosphere are provided in the cover plate (side plate portion), and the auxiliary air is sucked to improve the blowing efficiency. it can. The reason for providing the auxiliary intake port in this way is basically to ensure the amount of blown air. That is, when vacuum suction is performed, the amount of air sucked gradually decreases as the degree of vacuum increases, and accordingly, the amount of blown air due to use as a blower also decreases. For this reason, in order to secure a certain amount of blown air (intake air), it is necessary to provide an auxiliary intake port to suck in the auxiliary air. Further, by sucking the auxiliary air into the cylinder chamber, a cooling effect that lowers the pump temperature is produced as a secondary effect.

  In the conventional pump device, the cool air sent from the cooling fan provided at the rear end of the rotary pump is first circulated and passed around the rotary pump, and the rotary pump is driven by the cool air in a sufficiently low temperature state. The cool air that has cooled the rotary pump efficiently and accurately is circulated and passed around the aftercooler provided around the belt drive means existing between the two rotary pumps and the electric motor. Thus, the present applicant proposes cooling the high-temperature compressed fluid discharged from the rotary pump that circulates and passes through the aftercooler (see Patent Document 3).

  Further, the conventional pump device is a pump device that includes a rotary drive type pump body and a driven pulley that is fixed to the rotation shaft of the pump body and that transmits the driving force of the electric motor via a belt. In order to generate an air flow so as to cool the main body, a mandrel fixed to the end surface of the driven pulley on the pump main body side and guiding the air flow in a direction substantially perpendicular to the axis of the rotation shaft, A centrifugal fan-type impeller provided with a plurality of blades provided on the pump body side and rotating together with the rotation axis of the pump body being coaxial with the shaft center, and covering the impeller and discharging air The present applicant has proposed a fan cover including a fan cover having a discharge port (see Patent Document 4).

  Further, in the conventional pump device, a rotary drive type pump main body, a driving means for rotationally driving the rotary shaft of the pump main body, and a centrifugal fan type blade fixed and rotated so as to be concentric with the rotary shaft of the pump main body A pump device comprising a vehicle and a fan cover covering the impeller, wherein the fan cover discharges air in a substantially tangential direction concentric with the axis of the rotation shaft by the rotation of the impeller. Has been proposed by the present applicant, which includes a discharge port provided in a part of a wall that constitutes and a guide wall extending in a tangential direction so as to guide air to the discharge port (see Patent Document 5).

JP 2011-64078 A (first page) Japanese translation of PCT publication No. 2002-513887 (first page, FIG. 3) Japanese Patent Laying-Open No. 2005-299508 (first page) JP 2008-163907 A (first page) JP 2008-163909 A (first page)

The problem to be solved regarding the biaxial rotary pump is that two three-blade rotors having different shapes are arranged in the cylinder chamber, and the side plate portion forming the end face of the cylinder chamber has two shapes and sizes different from each other. One provided with two auxiliary air inlets is disclosed in Patent Document 2, but in this form, it is difficult to appropriately adjust the suction of auxiliary air.
Therefore, an object of the present invention is to provide a biaxial rotary pump that can appropriately adjust the suction of auxiliary air sucked into a cylinder chamber.

The present invention has the following configuration in order to achieve the above object.
According to one aspect of the biaxial rotary pump according to the present invention, the two rotors supported in a cantilever manner by the two rotary shafts arranged in parallel and rotating in opposite directions rotate in a non-contact manner in the cylinder chamber. A two-shaft rotary pump provided with a blade portion having three or more lobes, wherein the auxiliary air is supplied to the cylinder chamber. An auxiliary intake port provided at a position where the blade portion divides the cylinder chamber so as not to be communicated with the intake port or the exhaust port is inserted into the rotating shaft of the cylinder chamber. The two side plate portions constituting the non-side end portion are provided in two locations corresponding to the two rotors in the axial direction of the rotating shaft, and the two auxiliary intake ports are provided on the rotor. Times It is alternately opened and closed by.

Moreover, according to one form of the biaxial rotary pump which concerns on this invention, the said 2 rotor can be formed in the same shape, and it has the said blade part of the same shape, It can be characterized by the above-mentioned.
Further, according to one embodiment of the biaxial rotary pump according to the present invention, the two locations corresponding to the two rotors are symmetrical with respect to a line passing through an intermediate point of the axis of the two rotary shafts as a center line. An auxiliary air inlet may be located.

  Further, according to one aspect of the biaxial rotary pump according to the present invention, the auxiliary intake branch path branched from one auxiliary intake communication port is connected to the two auxiliary intake ports. can do.

  Moreover, according to one form of the biaxial rotary pump which concerns on this invention, the said side plate part is piled up and fixed on the outer side of this main body side plate and the main body side plate which forms the inner surface of the edge part of the said cylinder chamber. And the cover side plate is configured to have a double structure, and the auxiliary air intake port corresponds to the two rotors at two locations on the main body side plate so that the auxiliary air is sucked into the cylinder chamber. The auxiliary air that is opened in the axial direction of the rotating shaft is provided to the two auxiliary intake ports, and the auxiliary air drawn from the one auxiliary intake communication port is branched and ventilated by the auxiliary intake branch passage. As described above, the auxiliary intake branching passage may be constituted by an auxiliary intake groove formed in the main body side plate.

  Further, according to one embodiment of the biaxial rotary pump according to the present invention, a drive-side rotary shaft arranged in one of the two rotary shafts and provided in the rotary pump body including the cylinder chamber, and driving of the drive motor A fan impeller mounted coaxially on a power connecting shaft portion that connects the shaft is provided, and the exhaust port is provided to be opened in the side plate portion, and communicates blown air discharged from the exhaust port. An exhaust cooling air passage for the aftercooler that cools the air from the exhaust port passes through the lower side of the rotary pump body to the lower side of the impeller and is further provided around the periphery of the impeller. It can be characterized by being.

  Moreover, according to one form of the biaxial rotary pump which concerns on this invention, the said 2 rotor can be a rotor of a Roots pump, It can be characterized by the above-mentioned.

  According to one aspect of the biaxial rotary pump according to the present invention, there is a particularly advantageous effect that the suction of the auxiliary air sucked into the cylinder chamber can be appropriately adjusted.

It is a perspective view which shows the external appearance of the example of a biaxial rotary pump which concerns on this invention. It is a front side perspective view which shows the state which removed the cover ring of the example of FIG. It is a back side perspective view which shows the state which removed the cover ring of the example of FIG. FIG. 3 is a front perspective view showing a form in which an intake air filter, an auxiliary intake air filter, and an exhaust box are removed from the state of FIG. 2. It is a front side perspective view which shows the form which removed the exhaust branch box and the cover side plate from the state of FIG. It is a perspective view which shows the inner side of the component single-piece | unit of the cover side plate which concerns on this invention. FIG. 6 is a front perspective view showing two rotors in the cylinder chamber, with the main body side plate removed from the state of FIG. 5. It is a perspective view as a component single-piece | unit of the motor joint which concerns on this invention. It is sectional drawing as a component single-piece | unit of the motor joint which concerns on this invention. It is the longitudinal cross-sectional view which abbreviate | omitted some internal structures of the example of a form of FIG. It is the cross-sectional view which abbreviate | omitted a part of internal structure of the example of FIG. It is explanatory drawing which shows the rotational state of two rotors, and demonstrates the form example of the positional relationship of two rotors and two auxiliary inlets. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG. It is explanatory drawing of the state which rotated the 2 rotors 10 degrees from FIG.

  Hereinafter, the detail of the example of the biaxial rotary pump which concerns on this invention is demonstrated based on an accompanying drawing (FIGS. 1-23). As shown in FIGS. 11 and 12, etc., the biaxial rotary pump of the present invention has a basic configuration in which two rotary shafts 11A and 11B that are arranged in parallel and rotate in opposite directions are supported in a cantilever manner. The two rotors 12 </ b> A and 12 </ b> B rotate in a non-contact manner in the cylinder chamber 13, and are provided so that air is sucked from the intake port 21 and discharged from the exhaust port 22 in the cylinder chamber 13. As shown in FIGS. 10 and 11, the two rotary shafts 11 </ b> A and 11 </ b> B are supported by a bearing portion 16 a and a bearing portion 16 b configured as both end portions of the gear box 15. It is rotationally driven by the drive mechanism by the same gear structure 17. FIG. In the biaxial rotary pump of this embodiment, the two rotors 12A and 12B are the roots pump rotors, each of which includes a trilobal blade portion 12x (see FIGS. 7 and 12). Further, the two rotors 12A and 12B are formed in the same shape, and have a three-leaf blade portion 12x having the same shape, and have a highly symmetrical form.

  7 and 12, the blade portion 12x does not communicate with the intake port 21 or the exhaust port 22 by partitioning the cylinder chamber 13 so that the auxiliary air is sucked into the cylinder chamber 13. The auxiliary intake ports 25A and 25B provided at the positions are at two positions corresponding to the two rotors 12A and 12B of the side plate portion 19 constituting the end portion of the cylinder chamber 13 on the side where the rotation shafts 11A and 11B are not inserted. The two auxiliary intake ports 25A and 25B are alternately opened and closed by the rotation of the rotor. In this embodiment, the two auxiliary intake ports 25A and 25B are formed in a circular opening having the same shape.

  According to this, the auxiliary intake ports 25A and 25B are formed in the same shape for each of the two rotors 12A and 12B rotating in the cylinder chamber 13 having a cross-sectional shape obtained by superposing a part of two circles. Therefore, it is possible to appropriately adjust the suction of the auxiliary air sucked into the cylinder chamber 13 and appropriately adjust the air blowing function. For this reason, an optimal and highly functional operation can be performed as a blowing function (blower) by the biaxial rotary pump. The rotors 12A and 12B of the present embodiment are provided with the trilobal blade portion 12x, but the present invention is not limited to this, and if the blade portion 12x is equal to or more than the trilobal, as described above, Since the blade portion 12x partitions the inside of the cylinder chamber 13, a portion that does not communicate with the intake port 21 and the exhaust port 22 is generated in the side plate portion 19 and the cylinder peripheral wall portion 14, and an auxiliary intake port is provided at that portion. It can be provided.

  Further, in the embodiment shown in FIG. 12, the two rotors 12A, 12B are symmetrical with respect to a line passing through the midpoint of the axis of the two rotating shafts 11A, 11B of the two rotors 12A, 12B as a center line (CL). The two auxiliary inlets 25A and 25B corresponding to are located. That is, at the midpoint of the imaginary line connecting the axes of the two rotating shafts 11A and 11B, the auxiliary intake air is symmetric about two lines around the line perpendicular to the imaginary line and parallel to the surface of the side plate portion 19. The mouths 25A and 25B are located. In this embodiment, the two rotary shafts 11A and 11B of the two rotors 12A and 12B are arranged so as to be horizontally arranged, and the center positions of the two auxiliary intake ports 25A and 25B are It is provided at the same high position as the height position of the center of the two rotating shafts 11A and 11B.

  According to this embodiment, as can be seen from FIGS. 12 to 23 showing the state in which the two rotation shafts 11A and 11B are sequentially rotated by 10 °, the sum of the openings by the two auxiliary intake ports 25A and 25B is obtained. As much as possible, the intake amount of the auxiliary air can be made as constant as possible. That is, the area of the opening through which the auxiliary air is sucked becomes half the sum of the openings of the two auxiliary air intake ports 25A and 25B and becomes as constant as possible. In other words, the amount of exhausted air is always as constant as possible.

And according to the biaxial rotary pump of the form example shown in FIG. 12, since the two auxiliary inlets 25A and 25B do not open largely simultaneously, the maximum flow rate of auxiliary air is appropriately suppressed. Therefore, the size of the air passages connected to the two auxiliary intake ports 25A and 25B (for example, the auxiliary intake communication port 35 and the auxiliary intake branch passage 26 described later) and the auxiliary intake air filter 51 are small. Therefore, the apparatus can be downsized and the product cost can be reduced.
That is, according to this embodiment, the suction amount of the auxiliary air is made constant, so that the following problem can be solved. If the suction volume of the auxiliary air is not constant but increases momentarily, it is necessary to design a large flow path that matches the maximum suction volume and to select an intake filter, which increases the size and cost of the device. Problems arise. Furthermore, there is a problem that the suction sound of the air becomes louder when the suction amount of the auxiliary air increases or decreases.
In this embodiment, the two rotor shafts 11A and 11B are horizontally arranged so that the two rotors 12A and 12B are horizontally arranged. However, the present invention is limited to this. Instead, the two rotors 12A and 12B may be arranged so as to be arranged vertically.

  If the two auxiliary intake ports 25A and 25B are in a line-symmetrical position with a line passing through the midpoint between the axes of the two rotating shafts 11A and 11B as the center line (CL), the two auxiliary intake ports are provided. Even when the center positions of 25A and 25B are provided at the required distance from the position of the axis of the two rotation shafts 11A and 11B, the two auxiliary intake ports as described above. The sum total of the openings by 25A and 25B is as much as possible. Specifically, for example, if the example of FIG. 12 is used as a reference, the center positions of the two auxiliary intake ports 25A and 25B are above and below the height position of the axis of the two rotation shafts 11A and 11B. The case where it is provided at a position away from the same required distance corresponds to this, and the same effect as in the embodiment of FIG. 12 is obtained. For this reason, the opening positions of the two auxiliary intake ports 25A and 25B can be appropriately set within a predetermined range depending on design conditions.

  Further, in this embodiment, as shown in FIG. 5, the auxiliary intake ports 25A and 25B corresponding to the two rotors 12A and 12B branch from one auxiliary intake communication port 35 (see FIG. 4). An auxiliary intake branch 26 is connected.

According to this, by connecting one auxiliary intake air filter 51 (see FIGS. 1 to 3) to one auxiliary intake communication port 35 (see FIG. 4), two auxiliary intake ports 25A and 25B are provided. Since the number of parts can be reduced, it can be arranged compactly. For this reason, size reduction of an apparatus and cost reduction of a product can be aimed at. The auxiliary intake branch 26 is not limited to the form of the structure of the side plate portion 19 described later, but can also be provided with a form in which the ventilation path is branched by a pipe or the like provided in a branched shape. .
Further, the shape of the two auxiliary intake ports 25A and 25B is not limited to the circular shape as in the present embodiment, and may be other shapes, and each location is constituted by a plurality of openings. May be.

  By the way, it is point-symmetric about the midpoint of the axis of the two rotating shafts 11A and 11B of the two rotors 12A and 12B, and a desired angle is given to the virtual line connecting the two rotating shafts 11A and 11B. If the two auxiliary intake ports 25A and 25B corresponding to the two rotors 12A and 12B are positioned, the two auxiliary intake ports 25A and 25B are opened at the same time and closed at the same time. Will be repeated. According to this, it can utilize effectively depending on use conditions. As described above, the two rotors 12A and 12B are formed in the same shape, and the two auxiliary intake ports 25A and 25B are formed in the same shape, so that the air is sucked into the cylinder chamber 13. The suction of auxiliary air can be adjusted appropriately, and the air blowing function can be adjusted appropriately according to the use conditions.

  Next, according to the biaxial rotary pump according to the present invention, the side plate portion 19 constituting the end portion of the cylinder chamber 13 on the side where the rotation shafts 11 </ b> A and 11 </ b> B are not inserted is the inner surface of the end portion of the cylinder chamber 13. The main body side plate 20 is formed in a double structure, and the cover side plate 30 is overlapped and fixed on the outer side of the main body side plate 20. Further, the auxiliary intake ports 25 </ b> A and 25 </ b> B provided at positions where the blade portion 12 x does not communicate with the intake port 21 and the exhaust port 22 by partitioning the cylinder chamber 13 so that the auxiliary air is sucked into the cylinder chamber 13. Are provided in two locations on the main body side plate 20 corresponding to the two rotors 12A and 12B and are opened in the axial direction of the rotation shafts 11A and 11B.

  Then, the two auxiliary intake ports 25A and 25B are sucked from one auxiliary intake communication port 35 (see FIG. 4) provided in the axial direction of the rotation shafts 11A and 11B of the cover side plate 30. The auxiliary intake branch 26 is formed by an auxiliary intake groove 26a formed in the main body side plate 20 so that the auxiliary air is branched and ventilated by the auxiliary intake branch 26 (see FIG. 5). ).

According to this, the two auxiliary intake ports 25A and 25B can be communicated with one auxiliary intake communication port 35 without requiring special piping or the like, the number of parts can be reduced, and the arrangement can be made compact. Therefore, the apparatus can be downsized.
Further, as shown in FIG. 6, the cover side plate 30 has an inner side surface of the cover side plate 30 together with the auxiliary intake groove portion 26 a of the main body side plate 20 so as to expand the auxiliary intake branch passage 26. An auxiliary intake groove 26b is formed. According to this, the air permeability of the auxiliary intake air is improved, and the ventilation function can be stabilized because the airflow resistance is kept low and the suction balance is not lost.

  1 to 3, one auxiliary intake air filter 51 is attached to one auxiliary intake communication port 35 (see FIG. 4) of the cover side plate 30. According to this, it is only necessary to connect one auxiliary intake air filter 51 to the two auxiliary intake ports 25A, 25B, the number of parts can be reduced, the size can be reduced, and the product cost can be reduced.

The main body side plate 20 is provided with an intake port 21 (see FIG. 5) that is opened in the axial direction of the rotation shafts 11A and 11B, communicates with the intake port 21, and the cover side plate 30 has the rotation shafts 11A and 11B. An intake communication port 31 (see FIG. 4) opened in the axial direction is provided, and an intake air filter 50 (see FIGS. 1 to 3) is attached to the intake communication port 31.
As shown in FIG. 4, the intake communication port 31 is provided at the left and right centers of the cover side plate 30, while the auxiliary intake communication port 35 is provided at a position biased to one side. This is for mounting the auxiliary intake air filter 51 in a position where it does not interfere with the intake communication port 31 and the exhaust communication port 32, and is provided on the front side in consideration of maintainability. ing.

  In this way, the intake air filter 50, the auxiliary intake air filter 51, and the exhaust box 69 described later can be mounted on the surface of the side plate portion 19 and the side surface of the biaxial rotary pump as a whole device. Can be limited in height. That is, since the intake air filter 50 and the auxiliary intake air filter 51 are not mounted on the upper surface side of the biaxial rotary pump, the height of the entire apparatus can be reduced, and the apparatus can be freely installed. The degree increases. Further, according to the present embodiment, as shown in FIGS. 1 and 2, the maintenance surfaces of the intake air filter 50 and the auxiliary intake air filter 51 are unified to the front surface facing the blown air connection port 77. Therefore, it is configured to facilitate maintenance management.

  Next, according to the biaxial rotary pump according to the present invention, the rotary shaft 11A on the drive side disposed in the rotary pump body 10 which is one of the two rotary shafts 11A and 11B and includes the cylinder chamber 13, and the drive motor A power connection shaft portion 43 (see FIGS. 10 and 11) for connecting the 40 drive shafts 41 is provided with an impeller 45 of a blower mounted coaxially.

  The exhaust port 22 is provided by being opened in the side plate portion 19 that constitutes the end portion of the cylinder chamber 13 on the side where the rotation shafts 11A and 11B are not inserted, and the exhaust (air blowing) discharged from the exhaust port 22 is provided. An exhaust cooling air passage 71 of the aftercooler 70 that ventilates and cools the air) passes through the lower side of the rotary pump body 10 from the exhaust port 22 to the lower side of the impeller 45, and further, It is provided in a form surrounding the periphery.

  According to this, with the rotational drive of the drive shaft 41 of the drive motor 40, the impeller 45 mounted coaxially rotates, and the air blown to the inside of the impeller 45 and discharged outward is made. The rotary pump main body 10 and the aftercooler 70 can be appropriately cooled. That is, the impeller 45 substantially constitutes a centrifugal fan, and cooling air is sucked into the inside of the impeller 45 to generate airflow that flows along the outer surface of the rotary pump body 10. The exhaust cooling air passage 71 of the aftercooler 70 can be efficiently cooled by the air blown by the suction and the air blown to the outside of the periphery of the impeller 45. In this embodiment, the exhaust cooling air passage 71 of the aftercooler 70 is configured to be a long air passage extended by the exhaust branch box 72, the connection cooling pipe 73, the exhaust relay box 74, and the cooling pipe 75. The flow of the cooling air generated by the impeller 45 is applied to the cooling pipe 75 or the like to promote cooling.

  Further, according to this biaxial rotary pump, the cover ring 18 that includes the rotary pump main body 10, the intake air filter 50, and the auxiliary intake air filter 51 is provided. The cover ring 18 guides the cooling air flow generated by the suction of the impeller 45. In this embodiment, the impeller 45 is provided in the same form as that used for a sirocco fan, which is one of centrifugal fans, and has a shape in which a large number of blades are arranged in a ring shape on the core plate portion. The inner side of the impeller 45 is configured to open to the rotary pump body 10 side. According to this, air for cooling (cooling air) is blown so as to be sucked from the side of the rotary pump main body 10 to the inner part of the impeller 45 and discharged to the outside of the surroundings. Along with this, the cooling air is blown so as to pass between the outer surface of the rotary pump body 10 and the inner surface of the cover ring 18, and the rotary pump body 10 and the connection cooling pipe 73 are cooled first. . Next, the cooling air that has cooled the rotary pump body 10 is blown onto the cooling pipe 75, thereby cooling the cooling pipe 75. The exhaust air (blast air) is cooled by the aftercooler 70 thus cooled, and can be discharged as blow air through the blow air connection port 77.

  Further, according to the embodiment shown in FIGS. 5 and 7, as described above, the side plate portion 19 includes the main body side plate 20 that forms the inner surface of the end portion of the cylinder chamber 13, and the main body side plate 20. The main body side plate 20 is provided with an exhaust port 22 opened in the axial direction of the rotation shafts 11A and 11B. The continuous exhaust communication path 23 is constituted by an exhaust groove 23 a provided in the main body side plate 20 and an exhaust groove 23 b provided on the inner side surface of the cover side plate 30. According to this, it is possible to improve the air permeability of the exhaust through the exhaust communication passage 23. The exhaust communication passage 23 communicates with an exhaust communication port 32 provided in the cover side plate 30 and opened in the axial direction of the rotary shafts 11A and 11B. The exhaust communication port 32 cools and silences the exhaust gas. An exhaust box 69 is connected. Further, the exhaust box 69 is connected to the exhaust cooling air passage 71 of the aftercooler 70 for cooling the exhaust through the connection pipe 69a. In the present embodiment, the connection pipe 69 a is connected to the exhaust branch box 72 that constitutes a part of the exhaust cooling air passage 71. In addition, the exhaust communication port 32 is provided on the back side of the side surface when the surface on which the blown air connection port 77 is provided is a front surface in order to mount the exhaust box 69 so as not to interfere with the auxiliary intake air filter 51. Yes.

According to this, since the exhaust port 22 is connected to the exhaust box 69 via the exhaust communication passage 23 and the exhaust communication port 32, the exhaust is cooled and silenced primarily. The exhaust is ventilated through the exhaust cooling air passage 71 of the aftercooler 70, whereby the exhaust is cooled and silenced secondarily. As a result, the exhaust (blowing air) can be cooled and silenced more appropriately, and the blowing air suitable for the use conditions can be discharged from the blowing air connection port 77.
In the present embodiment, the exhaust port 22 is connected to the exhaust branch box 72 via the exhaust box 69, but may be connected to the exhaust branch box 72 from the exhaust communication path 23 without passing through the exhaust box 69. Good. For example, the exhaust communication passage 23 is provided so as to extend downward through the side plate portion 19 and communicate therewith, and at the lower end portion of the exhaust communication passage 23, the exhaust cooling air passage 71 of the aftercooler 70 is provided. It can be set as the form connected to the exhaust branch box 72 which comprises.

Further, as shown in FIGS. 8 and 9, a frame body portion 62 for fixing the rotary pump main body 10 is provided at one end portion of the cylindrical body 61, and the drive motor 40 is fixed to the other end portion of the cylindrical body 61. The rotary pump main body is provided with a motor joint 60 provided with a flange portion 63 for the purpose and including a power connecting shaft portion 43 in which the impeller 45 is mounted inside the cylindrical body 61 so as to function as a fan hood. 10 and the drive motor 40 are fixed in a connected state.
The rotary pump main body 10 and the frame body portion 62 are spaced members that can form a required gap so that the inside of the impeller 45 and the surrounding space of the rotary pump main body 10 communicate with each other through the opening 62a of the frame body portion 62. It is fixed via 65.

  According to this motor joint 60, the rotary pump main body 10 and the drive motor 40 such as an electric motor can be reliably fixed with high accuracy in their relationship. At the same time, since the motor joint 60 also functions as a fan hood, the motor joint 60 forms a cooling fan together with the impeller 45, so that the number of parts can be reduced. Yes.

  In addition, air outlets 61a and 61b are provided at two portions excluding the upper end and the lower end of the cylindrical body 61 of the motor joint 60 so that the cooling air by the air blow of the impeller 45 is discharged. A difference is provided in the opening degree of the blower openings 61a and 61b. According to this, when there is a restriction that it is not appropriate to provide the air outlets 61a and 61b for the upper end and the lower end of the cylinder 61 of the motor joint 60 depending on the installation conditions of the biaxial rotary pump, Yes. In addition, although the ventilation openings 61a and 61b of this embodiment are formed by the opening of a plurality of oblong holes, the present invention is not limited to this, and other shapes may be used. It may be configured.

  And about the opening degree of the two air blowing ports 61a and 61b of this embodiment, as shown in FIG.8 and FIG.9, the opening area is larger on the downstream side than the upstream side of the flow of the aftercooler 70. It is provided to become. That is, in the cooling pipe 75 formed by bending the pipe into a U-shape on the outlet (air blowing air connection port 77) side of the exhaust cooling air passage 71 of the aftercooler 70, About the downstream part 75b of the cooling pipe 75, the opening area of the downstream blower opening 61b is larger than the upstream blower opening 61a so that the amount of cooling air is blown more than the upstream part 75a. Is set.

  According to this, the cooling by the ventilation of the impeller 45 is more preferentially performed in the downstream portion 75b of the cooling pipe 75 than in the upstream portion 75a. On the other hand, the upstream portion 75a of the cooling pipe 75 has a larger temperature difference from the cooling air than the downstream portion 75b, and the temperature difference can be ensured to be large, so that the cooling is efficiently performed. For this reason, the cooling pipe 75 can be appropriately cooled by providing a difference in the opening degree of the two air blowing ports 61a and 61b.

  Note that the air blowing ports 61a and 61b are not limited to this embodiment, and if there is no restriction on the arrangement position, air blowing ports may also be provided at the upper end portion and the lower end portion of the cylinder body 61 of the motor joint 60. Further, depending on the installation conditions, for example, the air outlet 61a can be configured so that the cooling air is concentrated on the upstream portion 75a of the cooling pipe 75 having a high temperature.

  Furthermore, in this embodiment, as shown in FIG. 9, the central axis of the fan hood formed by the motor joint 60 is provided so as to be eccentric with respect to the central axis of the impeller 45. In particular, with respect to the upstream air outlet 61a, the wall portion of the fan hood is formed in a logarithmic curve so that the air passage gradually widens toward the upstream air outlet 61a. According to this, the efficiency of cooling air blow by the fan exhaust of the impeller 45 can be improved, and the cooling efficiency concerning the cooling pipe 75 can be increased.

Next, an example of the aftercooler 70 will be described in more detail.
From the exhaust port 22 side related to the cylinder chamber 13 of the rotary pump body 10 to the blown air connection port 77 that is the outlet of the pressurized blown air, the exhaust communication passage 23 and the exhaust box 69 provided in the side plate portion 19, An exhaust branch box 72 which is a constituent element of the aftercooler 70, a connection cooling pipe 73 passing through the lower side of the rotary pump body 10, an exhaust relay box 74, and a cooling pipe 75 surrounding the impeller 45 are successively connected. The exhaust (ventilation air) passage is constituted by the exhaust cooling air passage 71 connected thereto. Among these, the connection cooling pipe 73 and the cooling pipe 75 are constituted by a plurality of thin copper pipes. By using a thin copper pipe in this way, it is possible to improve the degree of freedom in arrangement and save space. Moreover, according to this, the surface area of piping becomes large and it can improve cooling efficiency. In this embodiment, the diameter and the number (seven) of the pipes constituting the connection cooling pipe 73 and the cooling pipe 75 are the same.

According to this, the connection cooling pipe 73 can effectively function as a part of the aftercooler 70 by being disposed in the passage of the cooling air. In this embodiment, the connection cooling pipe 73 is disposed so as to be wound on the bottom side of the rotary pump main body 10 and is configured to be appropriately cooled by the cooling air that is guided and flows by the cover ring 18. .
The exhaust branch box 72 and the exhaust relay box 74 are flat and correspond to the width of the rotary pump main body 10 so as to appropriately form a connection portion of a pipe for connecting to the connection cooling pipe 73 and the cooling pipe 75. It is formed in a rectangular box shape with the maximum length.

  Then, from the exhaust port 22 associated with the cylinder chamber 13, the exhaust communication path 23 provided in the side plate portion 19, the exhaust box 69, the connection pipe 69 a, the exhaust branch box 72, the connection cooling pipe 73, the exhaust relay box 74, Exhaust (expanded air) is vented in the order of the cooling pipe 75 and the blown air connection port 77 for connecting to the equipment where the pressurized blown air is used. And the contraction is repeated, and an excellent silencing effect can be obtained.

  Note that the exhaust (blowing air) discharged from the cylinder chamber 13 as described above is not limited to the form of being cooled by the aftercooler 70, and the exhaust is directly used as the blown air from the exhaust box 69 for use. May be. According to this, although the advanced air cooling and noise reduction by the aftercooler 70 are not made about the blowing air discharged | emitted from the cylinder chamber 13, depending on a use, it can utilize appropriately as blowing air which satisfy | fills use conditions.

In the above, although the example of the roots pump was demonstrated based on FIG.7 and FIGS.12-23, this invention is not limited to this, For example, it can apply also to the claw pump whose rotor is a claw rotor. Of course.
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.

10 Rotating pump body 11A Rotating shaft (Rotating shaft on the drive side)
11B Rotating shaft (driven-side rotating shaft)
12A Rotor 12B Rotor 12x Blade portion 13 Cylinder chamber 14 Cylinder peripheral wall portion 15 Gear box 16a Bearing portion 16b Bearing portion 17 Gear configuration 18 Cover ring 19 Side plate portion 20 Main body side plate 21 Intake port 22 Exhaust port 23 Exhaust communication passage 23a Exhaust Groove portion 23b Exhaust groove portion 25A Auxiliary intake port 25B Auxiliary intake port 26 Auxiliary intake branch 26a Auxiliary intake groove portion 26b Auxiliary intake groove portion 30 Cover side plate 31 Intake communication port 32 Exhaust communication port 35 Auxiliary intake communication port DESCRIPTION OF SYMBOLS 40 Drive motor 41 Drive shaft 43 Power connection shaft part 45 Impeller 50 Intake air filter 51 Auxiliary intake air filter 60 Motor joint 61 Cylindrical body 61a Upstream side air outlet 61b Downstream side air outlet 62 Frame body part 62a Opening 63 Franc Part 65 spacing member 69 exhaust box 69a connecting pipe 70 aftercooler 71 exhaust cooling air passage 72 exhaust branch box 73 connected cooling pipe 74 exhaust relay box 75 cooling pipe 75a upstream portion 75b downstream portion 77 blown air connection port CL vertical line

Claims (6)

Two rotors supported in a cantilever manner by two rotating shafts arranged in parallel and rotating in opposite directions rotate in a non-contact manner in the cylinder chamber, and in the cylinder chamber, air is sucked from the intake port and discharged from the exhaust port. A two-shaft rotary pump in which each of the two rotors has a blade portion of three or more lobes,
An auxiliary intake port provided at a position where the blade portion does not communicate with the intake port or the exhaust port by partitioning the cylinder chamber so that auxiliary air is sucked into the cylinder chamber. Of the side plate portion constituting the end portion on which the rotating shaft is not inserted, corresponding to the two rotors, and opened in the same shape in the axial direction of the rotating shaft. The auxiliary air inlets are alternately opened and closed by the rotation of the rotor ,
A blower that is coaxially mounted on a power connection shaft portion that connects one of the two rotation shafts, which is a drive-side rotation shaft disposed in a rotary pump body including the cylinder chamber, and a drive shaft of a drive motor. Equipped with an impeller
The exhaust port is provided to be opened in the side plate portion;
An exhaust cooling air passage of an aftercooler that communicates and cools the blown air discharged from the exhaust port passes through the lower side of the rotary pump body from the exhaust port to the lower side of the impeller. A biaxial rotary pump characterized in that it is provided in a form surrounding the impeller .   The two-shaft rotary pump according to claim 1, wherein the two rotors are formed in the same shape and include the blade portions having the same shape.   The two auxiliary inlets corresponding to the two rotors are positioned symmetrically with respect to a line passing through an intermediate point between the axes of the two rotating shafts as a center line. The biaxial rotary pump according to 2.   The biaxial rotary pump according to any one of claims 1 to 3, wherein an auxiliary intake branch passage branched from one auxiliary intake communication port is connected to the two auxiliary intake ports. The side plate portion is configured in a double structure by a main body side plate that forms an inner surface of an end portion of the cylinder chamber, and a cover side plate that is overlapped and fixed on the outer side of the main body side plate,
The auxiliary intake port is provided in two locations of the main body side plate corresponding to the two rotors so as to be opened in the axial direction of the rotating shaft so that auxiliary air is sucked into the cylinder chamber.
The auxiliary intake branch is connected to the two auxiliary intakes so that the auxiliary air drawn from the one auxiliary intake communication port is branched and ventilated by the auxiliary intake branch. The biaxial rotary pump according to any one of claims 1 to 4, wherein the biaxial rotary pump is constituted by an auxiliary intake groove formed in the side plate. The two-shaft rotary pump according to any one of claims 1 to 5 , wherein the two rotors are rotors of a roots pump.

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