pump

Abstract

To enable switch control of various channels by a switch valve integrated type pump.SOLUTION: A pump is equipped with a pump chamber 13 that has a suction port P11 and a plurality of discharge ports P21 and P22, an electric motor 41 that can normally and reversely rotate, an impeller 21 that is provided in the pump chamber and is driven by the electric motor, and a switch valve 31 that has a valve body portion 32 opening / closing the discharge ports and is rotated by the electric motor through the impeller. The valve body portion has a plurality of shielding portions blocking the discharge ports and a plurality of hole-opening portions opening the discharge ports. The shielding portions and the hole-opening portions are disposed so as to surround the impeller and are alternately aligned in a circumferential direction of the valve body portion so as to open or block the discharge ports according to rotary positions of the valve body portion. The discharge ports are formed on an inner peripheral surface 13a of the pump chamber along an outer peripheral surface of the valve body portion. The pump is equipped with a one-way rotation transmission mechanism 51 that is interposed between the impeller and the switch valve to transmit rotational force in a second direction from the impeller to the switch valve, but does not transmit rotational force in a first direction from the impeller to the switch valve.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a pump, and more particularly to a pump having an integral switching valve for switching a fluid flow path. [Background technology]

[0002] In recent years, automotive heat exchange systems have become more complex. This is due to the increasing electrification of automobiles from the perspective of carbon neutrality, and the number of objects to be cooled has increased, including not only the interior of the vehicle but also the motor and battery.

[0003] In such heat exchange systems, a switching valve and a water pump are provided to switch the path for circulating the cooling water in various ways depending on the operating conditions, and to perform efficient cooling (see, for example, Patent Documents 2 and 3 below).

[0004] Furthermore, Patent Document 1 listed below is a document that discloses a pump that is provided with a switching valve integrally therewith and that operates the switching valve using the driving force of an electric motor that drives an impeller. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-113623 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-213583 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-98628 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, switching valves and water pumps are usually used as a set, but in electric vehicles (EVs) and hybrid vehicles, heat exchange systems are often constructed by incorporating multiple sets of switching valves and water pumps, and each switching valve and water pump is equipped with a control motor.

[0007] Therefore, there is room for improvement in the current heat exchange system, for example, by integrating the switching valve and the pump, or by sharing the electric motor that drives the switching valve and the electric motor that drives the pump, thereby simplifying the system and reducing space and energy consumption.

[0008] On the other hand, Patent Document 1 discloses a pump with an integrated switching valve. However, this pump is a two-position, three-way switching valve, and the switching valve is controlled at two positions: a default position and a full lift position. For this reason, the pump described in this document is limited to simply switching the outlet or suction port (selectively opening one of two outlet or suction ports), and is not capable of more diverse control, such as simultaneously opening or closing two outlet ports, or having three or more outlet ports or two or more suction ports and switching the flow path between them.

[0009] SUMMARY OF THE INVENTION Therefore, an object of the present invention is to enable more diverse flow path switching control in a pump with an integrated switching valve that switches flow paths using an electric motor that drives the pump. [Means for solving the problem]

[0010] [First Invention] In order to solve the above problems and achieve the object, the pump of the first invention of the present application is a pump comprising: a pump chamber having an intake port for sucking in a fluid and two or more discharge ports for discharging the fluid; an electric motor capable of generating a rotational driving force in a first rotational direction and a rotational driving force in a second rotational direction that is opposite to the first rotational direction; an impeller rotatably provided within the pump chamber and driven to rotate by the electric motor, thereby generating a fluid flow that causes the fluid to flow from the intake port into the pump chamber and the fluid to flow out from the discharge port; and a switching valve having a valve body portion that opens and closes the discharge port and is driven to rotate by the electric motor via the impeller.

[0011] The valve body has two or more blocking wall portions that close the discharge port and two or more openings that open the discharge port. These blocking wall portions and openings are arranged to surround the impeller and are arranged alternately in the circumferential direction of the valve body so that the discharge port can be opened or closed depending on the rotational position (rotation angle) of the valve body. The two or more discharge ports are formed on the inner peripheral surface of the pump chamber around the impeller so as to follow the outer peripheral surface of the valve body. The pump also includes a one-way rotation transmission mechanism interposed between the impeller and the switching valve that transmits rotational drive force in the second rotation direction from the impeller to the switching valve but does not transmit rotational drive force in the first rotation direction from the impeller to the switching valve.

[0012] The pump according to the first aspect of the present invention is a pump that is integrally equipped with a switching valve that switches the fluid flow path, and makes it possible to drive the switching valve using an electric motor that drives the pump (impeller).

[0013] To drive the pump (impeller), the electric motor is rotated in a first rotational direction. The impeller receives rotational driving force from the electric motor and rotates in the first rotational direction. This rotation of the impeller draws fluid into the pump chamber through the intake port and discharges the drawn fluid out of the pump chamber through the open discharge port. Note that this rotational driving force in the first rotational direction is not transmitted to the selector valve because a one-way rotation transmission mechanism is interposed between the impeller and the selector valve. In this application, rotation in the first rotational direction may be referred to as "forward rotation," and rotation in the opposite second rotational direction may be referred to as "reverse rotation."

[0014] To drive the switching valve (switch the flow path), the motor is rotated in the reverse direction (in the second rotation direction). When the motor is rotated in the reverse direction, the one-way rotation transmission mechanism interposed between the impeller and the switching valve transmits the rotational drive force in the second rotation direction from the impeller to the switching valve, and the switching valve receives this rotational drive force and rotates in the second rotation direction. This allows the flow path to be switched.

[0015] The valve body of the switching valve has a blocking wall portion that closes the discharge port and an aperture portion that opens the discharge port, and these blocking wall portions and aperture portions are arranged so as to surround the impeller, and are arranged (circumferentially) along the circumferential surface of the valve body in a specific arrangement pattern (circumferential arrangement order, arrangement number, and circumferential length of each blocking wall portion and aperture portion).

[0016] On the other hand, the discharge ports (two or more discharge ports) through which the fluid flows out of the pump chamber are formed on the inner peripheral surface of the pump chamber around the impeller so as to follow the outer peripheral surface of the valve body. The valve body rotates and slides while in contact with each discharge port (the edge of the discharge port), and when the blocking wall portion faces the discharge port (when positioned at the discharge port formation position), the discharge port is closed, and when the opening portion faces the discharge port (when positioned at the discharge port formation position), the discharge port is opened.

[0017] The switching state of the flow path, i.e., which of the two or more outlets is open and which is closed, is determined by the rotational position (rotation angle) of the valve body. Note that, to detect the rotational position (rotation angle) of the valve body, a rotational angle sensor using, for example, a Hall element may be provided.

[0018] Furthermore, the type of switching state (multiple different switching states) that can be realized can be set in various ways depending on the number of outlets and their positions, the number of blocking wall portions and openings and their positions, the circumferential length of each blocking wall portion, etc.

[0019] For example, in the first embodiment described below, two discharge ports are provided at positions opposite each other across the rotation axis of the valve body portion, and the valve body portion is provided with three blocking wall portions and three opening portions. This not only allows the fluid discharge port to be simply switched between the first discharge port and the second discharge port (realizing two switching states), but also allows four switching states to be realized: (1) a state in which the first discharge port is open and the second discharge port is closed (forming a flow path for discharging the fluid that has flowed in from the suction port from the first discharge port), (2) a state in which the first discharge port is closed and the second discharge port is open (forming a flow path for discharging the fluid that has flowed in from the suction port from the second discharge port), (3) a state in which both the first discharge port and the second discharge port are open (forming a flow path for discharging the fluid that has flowed in from the suction port from both the first discharge port and the second discharge port), and (4) a state in which both the first discharge port and the second discharge port are closed (blocking of the flow path).

[0020] In addition to the first embodiment described above, according to the present invention (when the term "the present invention" is used in this application, it includes both the first invention described above and the second invention described below), it is possible to realize various switching states other than the four switching states described above, for example, by increasing the number of outlets to three or more, providing four or more blocking wall portions or openings, or changing the length (circumferential length) of each blocking wall portion.For example, it is possible to provide three outlets and discharge fluid from any one, two, or three of these outlets, or to provide two or more suction ports as in the second invention and second embodiment described below, so that the suction port through which the fluid flows in can be switched.

[0021] The switching valve may have a support part that supports the valve disc part and rotates together with the valve disc part, and the one-way rotation transmission mechanism may be a one-way clutch (for example, a cam clutch) provided between the support part and the impeller. Note that the one-way rotation transmission mechanism referred to in the present invention is not limited to any particular type. In addition to a one-way clutch, the one-way rotation transmission mechanism of the present invention may be, for example, a ratchet mechanism or any other mechanism that transmits rotational force in one direction but does not transmit rotational force in the opposite direction.

[0022] In the first aspect of the present invention, it is preferable to provide a one-way rotation blocking mechanism that allows the switching valve to rotate in the second rotation direction while blocking it from rotating in the first rotation direction. This is to more reliably maintain the switching valve in a stopped state and maintain the current switching state of the flow path. More specifically, when the electric motor is rotated in the first rotation direction to drive the pump (impeller), the rotational drive force in the first rotation direction is not transmitted to the switching valve due to the one-way rotation transmission mechanism. However, due to frictional force generated between the impeller and the switching valve, the rotating impeller may drag the switching valve, causing it to rotate in the first rotation direction, and the switching state of the flow path may change. Therefore, to prevent this, it is preferable to provide the one-way rotation blocking mechanism.

[0023] In this aspect, the switching valve may include a support part that supports the valve body and rotates together with the valve body, and the one-way rotation prevention mechanism may be provided between the support part and the inner surface of the pump chamber. The one-way rotation prevention mechanism may be, for example, a ratchet mechanism.

[0024] In the first aspect of the present invention, the impeller and the valve body portion may be arranged coaxially (in other words, the rotation axis of the impeller and the rotation axis of the valve body portion may coincide with each other).

[0025] Furthermore, in a typical embodiment of the first invention, the discharge port comprises a first discharge port and a second discharge port, each of which is arranged at a position opposite to each other across the rotation axis of the valve body portion; the valve body portion has a first opening portion, a second opening portion, and a third opening portion as the aperture portion, and a first shielding wall portion, a second shielding wall portion, and a third shielding wall portion as the shielding wall portion, the first opening portion and the third opening portion being formed at a position opposite to each other across the rotation axis of the valve body portion; the second opening portion is formed between the first opening portion and the third opening portion in the circumferential direction of the valve body portion; the first shielding wall portion extends between the first opening portion and the second opening portion; the second shielding wall portion extends between the second opening portion and the third opening portion; and the third shielding wall portion extends between the third opening portion and the first opening portion.

[0026] In the first aspect of the invention, when the direction parallel to the rotation axis of the impeller is defined as the up-down direction, the suction port may be provided on the bottom surface of the pump chamber below the impeller, and the electric motor may be provided above the impeller.

[0027] [Second Invention] The pump according to the second aspect of the present invention has two or more suction ports that draw fluid into a pump chamber, and is capable of opening, closing, or switching not only the discharge port but also these two or more suction ports.

[0028] Specifically, the pump includes a pump chamber having two or more intake ports for sucking in a fluid and two or more discharge ports for discharging the fluid, an electric motor capable of generating a rotational driving force in a first rotational direction and a rotational driving force in a second rotational direction opposite to the first rotational direction, an impeller rotatably provided within the pump chamber and driven to rotate by the electric motor to generate a fluid flow that causes the fluid to flow from the intake ports into the pump chamber and the fluid to flow out from the discharge ports, and a first valve body portion that opens and closes the discharge ports and a second valve body portion that opens and closes the intake port. and a switching valve that is rotationally driven by an electric motor via an impeller, wherein the first valve body portion has two or more blocking wall portions that close the discharge port and two or more opening portions that open the discharge port, the two or more blocking wall portions and the two or more opening portions are arranged so as to surround the impeller and are arranged alternately in the circumferential direction of the valve body portion so that the discharge port can be opened or closed depending on the rotation position of the valve body portion, the two or more discharge ports are formed on the inner peripheral surface of the pump chamber around the impeller so as to follow the outer peripheral surface of the valve body portion, and the second valve body portion is arranged together with the first valve body portion. Rotate The pump is provided with a one-way rotation transmission mechanism that is interposed between the impeller and the switching valve and transmits the rotational driving force in the second rotation direction from the impeller to the switching valve, but does not transmit the rotational driving force in the first rotation direction from the impeller to the switching valve.

[0029] In addition, in the pump according to the second invention, the switching valve may have a support part that supports the first valve body part and the second valve body part and rotates together with the first valve body part and the second valve body part, and the one-way rotation transmission mechanism may be constituted by a one-way clutch interposed between the support part and the impeller.

[0030] Furthermore, for the same reasons as in the first invention, it is preferable that the second invention also be provided with a one-way rotation prevention mechanism that allows the switching valve to rotate in the second rotation direction while preventing the switching valve from rotating in the first rotation direction.

[0031] In this case, the switching valve may have a support portion that supports the first valve body portion and the second valve body portion and rotates together with the first valve body portion and the second valve body portion, and the one-way rotation prevention mechanism may be constituted by a ratchet mechanism that is interposed between the support portion and the inner surface of the pump chamber.

[0032] Furthermore, the impeller, the first valve body portion, and the second valve body portion may be arranged coaxially (the rotation axis of the impeller, the rotation axis of the first valve body portion, and the rotation axis of the second valve body portion may be aligned).

[0033] In a typical embodiment of the second invention, the discharge port comprises a first discharge port and a second discharge port, each of which is arranged at a position opposite to each other across the rotation axis of the first valve body portion; the first valve body portion has a first opening portion, a second opening portion, and a third opening portion as opening portions, and a first blocking wall portion, a second blocking wall portion, and a third blocking wall portion as blocking wall portions, the first opening portion and the third opening portion being formed at a position opposite to each other across the rotation axis of the valve body portion; the second opening portion is formed between the first opening portion and the third opening portion in the circumferential direction of the valve body portion; the first blocking wall portion extends between the first opening portion and the second opening portion; the second blocking wall portion extends between the second opening portion and the third opening portion; and the third blocking wall portion extends between the third opening portion and the first opening portion.

[0034] In yet another aspect of the second invention, the second valve body has a cylindrical shape and is arranged coaxially with the first valve body, and has one or more blocking walls that close the suction port and one or more openings that open the suction port, the blocking walls and openings being arranged circumferentially of the second valve body so that the suction port can be opened or closed depending on the rotational position of the second valve body, and the pump has a cylindrical suction chamber that houses the second valve body so that it can slide and rotate, and the two or more suction ports open on the inner surface of the suction chamber.

[0035] In the above-mentioned another aspect, when the direction parallel to the rotation axis of the impeller is defined as the up-down direction, the suction chamber may be provided on the underside of the pump chamber, and the electric motor may be provided above the impeller. [Effects of the Invention]

[0036] According to the present invention, in a pump with an integrated switching valve that switches flow paths using an electric motor that drives the pump, it is possible to perform more diverse flow path switching control.

[0037] Other objects, features, and advantages of the present invention will become apparent from the following description of the preferred embodiments of the present invention, which is given with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention is not limited to the following embodiments, and that various modifications can be made within the scope of the claims. In addition, the same reference numerals in the various drawings indicate the same or equivalent parts. [Brief explanation of the drawings]

[0038] [Figure 1] FIG. 1 is a perspective view showing a pump according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a vertical cross-sectional view showing the pump according to the first embodiment. [Figure 3] FIG. 3 is a horizontal end view (an end view taken along the line X1-X1 in FIG. 2) showing the pump according to the first embodiment. [Figure 4] FIG. 4 is a horizontal end view (an end view taken along the line X2-X2 in FIG. 2) showing the pump according to the first embodiment. [Figure 5] FIG. 5 is a horizontal end view (an end view taken along the line X1-X1 in FIG. 2) showing a first switching state by the switching valve of the pump according to the first embodiment. [Figure 6] FIG. 6 is a horizontal end view (an end view taken along the line X1-X1 in FIG. 2) showing a second switching state by the switching valve of the pump according to the first embodiment. [Figure 7] FIG. 7 is a horizontal end view (an end view taken along the line X1-X1 in FIG. 2) showing a third switching state by the switching valve of the pump according to the first embodiment. [Figure 8] FIG. 8 is a horizontal end view (an end view taken along the line X1-X1 in FIG. 2) showing a fourth switching state by the switching valve of the pump according to the first embodiment. [Figure 9] FIG. 9 is a horizontal end view (an end view taken along the line X1-X1 in FIG. 2) showing a modification of the pump according to the first embodiment. [Figure 10] FIG. 10 is a horizontal end view (an end view taken along the line X1-X1 in FIG. 2) showing another modified example of the pump according to the first embodiment. [Figure 11] FIG. 11 is a horizontal end view (an end view taken along the line X1-X1 in FIG. 2) showing yet another modified example of the pump according to the first embodiment. [Figure 12] FIG. 12 is a perspective view showing a pump according to a second embodiment of the present invention. [Figure 13] FIG. 13 is a vertical cross-sectional view showing the pump according to the second embodiment. [Figure 14] FIG. 14 is a horizontal end view (an end view taken along the line X3-X3 in FIG. 13) showing the first switching state of the switching valve of the pump according to the second embodiment. [Figure 15] FIG. 15 is a horizontal end view (an end view taken along the line X3-X3 in FIG. 13) showing the second switching state of the switching valve of the pump according to the second embodiment. [Figure 16] FIG. 16 is a horizontal end view (an end view taken along the line X3-X3 in FIG. 13) showing a third switching state by the switching valve of the pump according to the second embodiment. [Figure 17] FIG. 17 is a horizontal end view (an end view taken along the line X3-X3 in FIG. 13) showing a fourth switching state by the switching valve of the pump according to the second embodiment. [Figure 18] FIG. 18 is a horizontal end view (an end view taken along the line X3-X3 in FIG. 13) showing the first switching state by the switching valve of the modified example of the pump according to the second embodiment. [Figure 19] FIG. 19 is a horizontal end view (an end view taken along the line X3-X3 in FIG. 13) showing the second switching state by the switching valve of the modified example of the pump according to the second embodiment. [Figure 20]FIG. 20 is a horizontal end view (an end view taken along the line X3-X3 in FIG. 13) showing a third switching state by the switching valve of the modified example of the pump according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0039] [First embodiment] As shown in Figures 1 to 4, a pump 11 according to a first embodiment of the present invention includes a housing 12 having a pump chamber 13 therein, an impeller 21 rotatably installed inside the pump chamber 13, a suction pipe 15 for drawing fluid into the pump chamber 13, two discharge pipes (a first discharge pipe 16 and a second discharge pipe 17) having discharge ports P21 and P22 for discharging the fluid from the pump chamber 13, a switching valve 31 for opening and closing the discharge ports P21 and P22, an electric motor (motor) 41 for driving the rotation of the impeller 21 and the switching valve 31, a one-way clutch (one-way rotation transmission mechanism) 51 interposed between the impeller 21 and the switching valve 31, a ratchet mechanism (one-way rotation prevention mechanism) 61 interposed between the switching valve 31 and the housing 12 (the inner peripheral surface 13a of the pump chamber 13), and a lid 14 for closing the top surface of the pump chamber 13.

[0040] The pump chamber 13 has a circular planar shape and an annular inner peripheral surface 13a that stands vertically so as to surround the impeller 21. The first discharge pipe 16 and the second discharge pipe 17 are provided so as to face each other across the pump chamber, and a first discharge port P21, which is an opening of the first discharge pipe 16 to the pump chamber 13, and a second discharge port P22, which is an opening of the second discharge pipe 17 to the pump chamber 13, are formed on the inner peripheral surface 13a of the pump chamber 13 so as to face each other across the central axis A of the pump chamber 13.

[0041] Impeller 21 is disposed in the center of pump chamber 13 so that rotation axis A is in the vertical direction (the up-and-down direction in FIG. 2), and suction port P11, which is the opening of suction pipe 15 to pump chamber 13, is formed below impeller 21 (at the center of the bottom surface of pump chamber 13). Note that the central axis A of pump 11 in this embodiment, the central axis A of pump chamber 13, the central axis A of suction pipe 15 (and suction port P11), the rotation axis A of impeller 21, the rotation axis A of rotor 42 (described later), and the rotation axis A of switching valve 31 all extend in the vertical direction and coincide (overlap) with one another when viewed from a plane (vertical direction).

[0042] A motor 41 is provided above the impeller 21 to drive the impeller 21 and the switching valve 31. The motor 41 has a rotor 42 with the impeller 21 integrally mounted at its lower end, and a stator 43 that includes a coil 44 and generates a magnetic field to rotate the rotor 42, and these are covered with a resin molded cover 45 formed on the upper surface of the lid 14. The rotor 42 is housed in a cylindrical portion 14a that is formed to protrude upward from the center of the lid 14, which closes the top surface (upper surface) of the pump chamber 13 in a watertight manner, and the stator 43 is disposed on the outside of the cylindrical portion 14a.

[0043] The rotor 42, impeller 21, and switching valve 31 are rotatably supported by a shaft 46 that extends vertically along the central axis A of the pump 11. The shaft 46 passes through the centers of the rotor 42, impeller 21, and switching valve 31. The upper end of the shaft 46 is fixed to the upper surface of the cylindrical portion 14a of the cover 14, and the lower end of the shaft 46 is fixed to a bearing member 47 disposed in the center of the suction port P11. The bearing member 47 is supported by legs 48 on the upper inner circumferential surface of the suction pipe 15.

[0044] Impeller 21 has a plurality of blades 24 extending radially from rotation axis A between bottom plate 23 and top plate 22, and also has a cylindrical raised base 25 that extends vertically downward and has no bottom or lid at the center of the underside of bottom plate 23. Note that top plate 22, bottom plate 23, and the blades 24 provided therebetween are collectively referred to as the impeller main body.

[0045] A central hole communicating with the plateau portion 25 is formed in the center of the bottom plate portion 23, and the interior of the impeller main body (the space between the bottom plate portion 23 and the top plate portion 22) and the suction port P11 are connected through the plateau portion 25. Therefore, the fluid (see arrow W1 in FIG. 2) sucked into the pump chamber 13 from the suction port P11 by the rotation of the impeller 21 passes through the inside of the plateau portion 25 and flows into the interior of the impeller main body (the space between the bottom plate portion 23 and the top plate portion 22) from the central hole of the bottom plate portion 23, and is released from between the blades 24 toward the inner circumferential surface 13a of the pump chamber 13 by the centrifugal force of the rotating impeller 21, and is then discharged to the outside through the open discharge ports P21, P22 and the discharge pipes 16, 17 (see arrow W2 in FIG. 2).

[0046] A switching valve 31 is provided around the impeller 21. The switching valve 31 has a cylindrical valve body portion 32 that surrounds the impeller main body portion, a support portion 33 that has a cylindrical shape so as to surround the elevated portion 25 and supports the valve body portion 32 from below, and an arm portion 34 that extends from the lower end of the support portion 33 toward the shaft 46 and rotatably supports the support portion 33 (switching valve 31) on the shaft 46.

[0047] Although the valve element 32 typically has a cylindrical shape as in this embodiment, it may also have a truncated cone shape or a flat barrel shape, for example. In that case, the pump chamber inner circumferential surface 13a around the valve element 32, where the discharge ports P21, P22 are formed, may have a shape corresponding to the circumferential shape of the valve element 32 (expanding along the outer circumferential surface of the valve element 32) so that the valve element 32 can open and close the discharge ports P21, P22.

[0048] The valve body portion 32 has a plurality of blocking wall portions 26 (26a, 26b, 26c) arranged circumferentially and a plurality of opening portions 27 (27a, 27b, 27c), and opens and closes the discharge ports P21, P22 by sliding and rotating against the inner surface 13a of the pump chamber 13 as the switching valve 31 rotates (rotating while in contact with the inner surface 13a of the pump chamber 13).

[0049] More specifically, in this embodiment, three blocking wall portions 26 that close the discharge ports P21, P22, i.e., a first blocking wall portion 26a, a second blocking wall portion 26b, and a third blocking wall portion 26c, and three opening portions 27 that open the discharge ports P21, P22, i.e., a first opening portion 27a, a second opening portion 27b, and a third opening portion 27c, are provided. The first opening portion 27a and the third opening portion 27c are formed at positions facing each other across the rotation axis A of the valve body portion 32, and the second opening portion 27b is formed between the first opening portion 27a and the third opening portion 27c in the circumferential direction of the valve body portion 32.

[0050] Furthermore, first blocking wall portion 26a extends between first opening 27a and second opening 27b, second blocking wall portion 26b extends between second opening 27b and third opening 27c, and third blocking wall portion 26c extends between third opening 27c and first opening 27a. When blocking wall portion 26 faces discharge ports P21 and P22, the discharge ports are closed, and when opening portion 27 faces discharge ports P21 and P22, the discharge ports are opened. The opening and closing operation of discharge ports P21 and P22 by switching valve 31 will be described in detail later with reference to FIGS. 5 to 8.

[0051] The one-way clutch 51 interposed between the impeller 21 and the switching valve 31 enables both the impeller 21 and the switching valve 31 to be driven by the common motor 41, and in this embodiment, a cam clutch is used (see FIG. 4). More specifically, the cam clutch 51 is provided on the support part 33 so as to be interposed between the plateau part 25 of the impeller 21 and the support part 33 surrounding the plateau part 25, and transmits rotational force from the plateau part 25 to the support part 33 in the second rotational direction R2, but does not transmit rotational force in the first rotational direction R1.

[0052] Therefore, when the motor 41 is rotated forward and the impeller 21 integrated with the rotor 42 is rotated in the first rotation direction R1 (when the pump is operating), the rotational driving force of the motor 41 is not transmitted from the impeller 21 (base portion 25) to the switching valve 31 (support portion 33). However, when the motor 41 is rotated reversely and the impeller 21 is rotated in the second rotation direction R2 (when the switching valve 31 is operating / when the flow path is switched), the rotational driving force of the motor 41 is transmitted from the impeller 21 (base portion 25) to the switching valve 31 (support portion 33), and therefore the switching valve 31 (and therefore the valve body portion 32) can be rotated in the second rotation direction R2.

[0053] On the other hand, the ratchet mechanism 61 interposed between the switching valve 31 and the inner circumferential surface 13a of the pump chamber 13 prevents the switching valve 31 from rotating in the first rotation direction R1.

[0054] Specifically, the ratchet mechanism 61 consists of a plurality of teeth 33a formed on the outer peripheral surface of the support portion 33 and a locking pin 62 extending from the inner peripheral surface 13a of the pump chamber 13 toward the support portion 33. When the support portion 33 rotates in the second rotation direction R2, the locking pin 62 escapes outward and does not engage with the teeth 33a, allowing the support portion 33 (switching valve 31) to rotate in the second rotation direction R2. However, when the support portion 33 rotates in the first rotation direction R1, the locking pin 62 engages with the teeth 33a, thereby preventing the support portion 33 (switching valve 31) from rotating in the first rotation direction R1.

[0055] By interposing the cam clutch 51 between the impeller 21 and the switching valve 31, the rotational driving force of the motor 41 is not transmitted to the switching valve 31 when the pump is driven (when the motor 41 is rotating forward), but if only the cam clutch 51 is used, there is a risk that the switching valve 31 will be dragged and rotated by the rotating impeller 21 due to the frictional force between the impeller 21 and the switching valve 31 (cam clutch 51). In contrast, by providing the ratchet mechanism 61, it is possible to reliably maintain the switching valve 31 in a stopped state when the pump is driven, thereby maintaining the switching state of the flow path.

[0056] The teeth 33a of the ratchet mechanism 61 are formed so as to engage exactly with the locking pin 62 in each of a plurality of switching states (first to fourth switching states) of the switching valve 31, which will be described later.

[0057] The operation of the pump 11 according to this embodiment will be described with reference to FIGS.

[0058] [First switching state] 5 shows the first switching state of the pump 11 according to this embodiment, in which the second opening 27b of the valve body 32 faces directly opposite the first discharge port P21, thereby opening the first discharge port P21, and the third blocking wall 26c of the valve body 32 closes the second discharge port P22. Therefore, when the pump 11 is driven in this first switching state (the motor 41 is rotated forward), the rotation of the impeller 21 causes fluid to be sucked into the pump chamber 13 from the suction port P11, and the fluid passes through the second opening 27b and the first discharge port P21 and is discharged from the first discharge pipe 16 (see arrow W2).

[0059] In addition, in Figure 5, a small schematic diagram showing the flow path is shown in the upper right corner, which shows that a flow path is formed from the intake port P11 to the first discharge port P21 (similar schematic diagrams are also shown in Figures 6 to 8 and Figures 14 to 20 of the second embodiment described below).

[0060] 2 and 3 show a structure in which the valve body portion 32 (shielding wall portion 26) contacts not only the edges of the discharge ports P21 and P22 but also the inner circumferential surface 13a between the first discharge port P21 and the second discharge port P22, whereas FIGS. 5 to 8 show a structure in which the edges of the discharge ports P21 and P22 protrude toward the center of the pump chamber 13, and the valve body portion 32 (shielding wall portion 26) contacts only the edges of the discharge ports and does not contact other parts of the inner circumferential surface 13a of the pump chamber (the inner circumferential surface 13a between the first discharge port P21 and the second discharge port P22). However, any of these structures may be adopted in the present invention, this embodiment, and the second embodiment described below.

[0061] However, when adopting a structure in which the valve body portion 32 contacts only the edges of the discharge ports P21, P22 as shown in Figures 5 to 8, in order to prevent some of the fluid flowing from the opening portion 27 toward the discharge ports P21, P22 from leaking into the gap between the valve body portion 32 and the pump chamber inner surface 13a, it is preferable to configure the opening portion 27 of the valve body portion 32 to be smaller than the discharge ports P21, P22 and so that the opening portion 27 is located inside the edges of the discharge ports P21, P22 when facing the discharge ports P21, P22.

[0062] In the first switching state, the locking pin 62 of the ratchet mechanism 61 is engaged with the teeth 33a (as shown in FIG. 4), and the switching valve 31 (support portion 33) does not rotate in the first rotation direction R1 even when the impeller 21 (high base portion 25) rotates. The same applies to the second to fourth switching states described below.

[0063] [Second switching state] Figure 6 shows the second switching state of the pump 11 according to this embodiment, in which the switching valve 31 is rotated 180° counterclockwise (towards the second rotation direction R2) from the first switching state.

[0064] To rotate the switching valve 31, as described above, the motor 41 is driven in the reverse direction to rotate the impeller 21 in the second rotation direction R2. As a result, the cam clutch 51 provided between the platform portion 25 (impeller 21) and the support portion 33 (switching valve 31) transmits the rotational drive force in the second rotation direction R2 from the platform portion 25 to the support portion 33, causing the switching valve 31 (valve body portion 32) to rotate counterclockwise. When the switching valve 31 is driven, an angle sensor (not shown) detects the rotation angle of the switching valve 31, and the driving of the motor 41 is stopped when the switching valve 31 has rotated 180°.

[0065] In this second switching state, the second opening 27b faces the second discharge port P22, thereby opening the second discharge port P22, and the third blocking wall 26c closes the first discharge port P21, thereby forming a flow path from the suction port P11 to the second discharge port P22. When the pump 11 is driven in this second switching state, fluid is sucked from the suction port P11 into the pump chamber 13, and the fluid passes through the second opening 27b and the second discharge port P22 and is discharged from the second discharge pipe 17 (see arrow W3).

[0066] [Third switching state] Figure 7 shows the third switching state of the pump 11 according to this embodiment, in which the switching valve 31 is rotated 270° counterclockwise (towards the second rotation direction R2) from the first switching state.

[0067] In this third switching state, the first opening 27a faces the first discharge port P21 and the third opening 27c faces the second discharge port P22, so that both the first discharge port P21 and the second discharge port P22 are opened, and a flow path is formed from the suction port P11 to both the first discharge port P21 and the second discharge port P22. Therefore, when the pump 11 is driven in this third switching state, the fluid sucked into the pump chamber 13 from the suction port P11 is discharged from both the first discharge pipe 16 and the second discharge pipe 17 (see arrows W2 and W3).

[0068] [Fourth switching state] Figure 8 shows the fourth switching state of the pump 11 according to this embodiment, in which the switching valve 31 is rotated 210° counterclockwise (towards the second rotation direction R2) from the first switching state.

[0069] In this fourth switching state, the first discharge port P21 is closed by the first blocking wall portion 26a, and the second discharge port P22 is closed by the third blocking wall portion 26c, resulting in a valve-closed state in which the flow path is blocked.

[0070] Thus, according to this embodiment, it is possible not only to simply switch the flow path (outlet) between the first outlet P21 and the second outlet P22, but also to simultaneously eject fluid from both the first outlet P21 and the second outlet P22 (third switching state) or to block the flow path (fourth switching state).

[0071] The positions of the discharge ports (discharge pipes) can be variously arranged, such as arranging the first discharge port P21 (first discharge pipe 16) and the second discharge port P22 (second discharge pipe 17) at an angle of 90° to each other as shown in Fig. 9, or arranging them at an angle less than 90° or more than 90°. Also, the number of discharge ports (discharge pipes) can be, for example, three discharge ports P21, P22, and P23 as shown in Fig. 10, four discharge ports P21, P22, P23, and P24 as shown in Fig. 11, or five or more discharge ports.

[0072] Furthermore, by appropriately modifying the valve body portion 32, such as increasing or decreasing the number of blocking wall portions 26 and opening portions 27 or changing the circumferential length of the blocking wall portion 26, depending on the combination of flow paths (switching states) to be formed, it is possible to construct pumps based on the present invention that have various switching states other than those of this embodiment and the second embodiment described below.

[0073] Second Embodiment As shown in FIGS. 12 to 17, a pump 71 according to a second embodiment of the present invention, like the pump 11 of the first embodiment, comprises a housing 12 having a pump chamber 13 therein, an impeller 21 rotatably installed inside the pump chamber 13, two discharge pipes (a first discharge pipe 16 and a second discharge pipe 17) having discharge ports P21 and P22 for discharging fluid from the pump chamber 13, a switching valve 31 for opening and closing the discharge ports P21 and P22, a motor 41 for rotating the impeller 21 and the switching valve 31, and a switch valve 31 interposed between the impeller 21 and the switching valve 31. The pump 11 of the first embodiment is equipped with a one-way clutch 51, a ratchet mechanism interposed between the switching valve 31 and the housing 12 (the inner peripheral surface 13a of the pump chamber 13), and a cover 14 that closes the top surface of the pump chamber 13, thereby enabling the discharge ports P21, P22 to be switched, but unlike the pump 11 of the first embodiment, it is equipped with a plurality of suction pipes 73, 74 (two in this embodiment) that draw fluid into the pump chamber 13, enabling the plurality of suction ports P11, P12 corresponding to these plurality of suction pipes 73, 74 to be switched. Hereinafter, the same components as those of the first embodiment will be assigned the same reference numerals, and redundant explanations will be omitted, with the differences being mainly described.

[0074] In this embodiment, the switching valve 31 has a first valve body 32 that has a structure similar to that of the valve body 32 in the first embodiment and is therefore capable of opening and closing the first discharge port P21 and the second discharge port P22. In addition, the switching valve 31 has a second valve body 35 that opens and closes the suction ports P11 and P12. The bottom of the pump chamber 13 is provided with a suction chamber 72 that communicates with the pump chamber 13, and the second valve body 35 is disposed within the suction chamber 72. Furthermore, in this embodiment, a shaft 46 extends to the bottom of the suction chamber 72 and penetrates the second valve body 35 to rotatably support the second valve body 35. The lower end of the shaft 46 is supported on the bottom of the suction chamber 72.

[0075] The second valve body 35 has a cylindrical shape including one blocking wall portion 75 and one opening portion 76. The second valve body 35 is integral with the first valve body 32 and the support portion 33 and rotates together with the first valve body 32. The suction chamber 72 has a cylindrical shape with a bottom and no lid, and has a vertically extending inner circumferential surface 72a. The inner circumferential surface 72a of the suction chamber 72 is formed with a first suction port P11 and a second suction port P12, which are opposed to each other across the central axis of the suction chamber 72. The first suction port P11 and the second suction port P12 are opened and closed by the sliding rotation of the second valve body 35 within the suction chamber 72. Specifically, when the opening portion 76 of the second valve body 35 faces the suction port P11 or P12, the suction port is opened. When the blocking wall portion 75 of the second valve body 35 faces the suction port P11 or P12, the suction port is closed.

[0076] The suction chamber 72 and the second valve body portion 35 are arranged coaxially with the pump chamber 13, the impeller 21, the rotor 42 and the first valve body portion 32, and the central axis of the suction chamber 72 and the rotation axis A of the second valve body portion 35 both extend vertically and coincide with the central axis A of the pump chamber 13 and the rotation axes A of the impeller 21, the rotor 42 and the first valve body portion 32 when viewed from a plane (vertically).

[0077] The first suction pipe 73 and the second suction pipe 74 extend vertically downward from the outer peripheral surfaces of both radial ends of the suction chamber 72, with the upper ends of each suction pipe 73, 74 fixed to the outer peripheral surface of the suction chamber 72. At these fixed portions, holes formed to penetrate horizontally through the side walls of the suction pipes 73, 74 are connected to holes formed to penetrate horizontally through the side wall of the suction chamber 72, thereby communicating the suction pipes 73, 74 with the suction chamber 72. The suction ports P11, P12 are formed by the holes that penetrate the side walls of the suction chamber 72.

[0078] The operation of the pump 71 of this embodiment will be described as follows.

[0079] [First switching state] 14 shows the first switching state of the pump 71 according to this embodiment, in which the opening 76 of the second valve body 35 faces the first suction port P11, thereby opening the first suction port P11, and the blocking wall 75 of the second valve body 35 faces the second suction port P12, thereby closing the second suction port P12. In this first switching state, the first valve body 32 is in the first switching state shown in FIG.

[0080] Therefore, when the pump 71 is driven (the motor 41 is rotated forward) in this first switching state, fluid is sucked into the pump chamber 13 through the suction chamber 72 from the first suction port P11 (first suction pipe 73) (see arrow W4), and the fluid is discharged from the first discharge pipe 16 through the second opening portion 27b (see Figure 5) of the first valve body portion 32 and the first discharge port P21.

[0081] [Second switching state] 15 shows a second switching state of the pump according to this embodiment, in which the switching valve 31 is rotated 180° counterclockwise (in the second rotation direction R2) from the first switching state. When the switching valve 31 is driven, the angle of rotation of the switching valve 31 is detected by an angle sensor (not shown) as in the first embodiment, and the driving of the motor 41 is stopped at the position where the switching valve 31 is rotated 180°.

[0082] In this second switching state, the opening 76 of the second valve body 35 faces the second suction port P12, thereby opening the second suction port P12, and the blocking wall 75 of the second valve body 35 faces the first suction port P11, thereby closing the first suction port P11. Furthermore, since the first valve body 32 and the second valve body 35 rotate integrally (together), in the second switching state the first valve body 32 is in the second switching state shown in FIG.

[0083] When the pump 71 is driven in this second switching state, fluid is sucked into the pump chamber 13 through the suction chamber 72 from the second suction port P12 (second suction pipe 74) (see arrow W5), and the fluid is discharged from the second discharge pipe 17 through the second opening portion 27b (see Figure 6) of the first valve body portion 32 and the second discharge port P22.

[0084] [Third switching state] Figure 16 shows the third switching state of the pump 71 in this embodiment, and this third switching state is a state in which the switching valve 31 is rotated 270° counterclockwise (towards the second rotation direction R2) from the first switching state.

[0085] In this third switching state, the opening 76 of the second valve body 35 opens both the first suction port P11 and the second suction port P12. The first valve body 32 is also in the third switching state shown in FIG.

[0086] When the pump 71 is driven in this third switching state, fluid is drawn into the pump chamber 13 through the suction chamber 72 from both the first suction port P11 (first suction pipe 73) and the second suction port P12 (second suction pipe 74) (see arrows W4 and W5), and the fluid is discharged from both discharge pipes 16 and 17. That is, the fluid is discharged from the first discharge pipe 16 through the first opening 27a (see FIG. 7) of the first valve body 32 and the first discharge port P21, and the fluid is discharged from the second discharge pipe 17 through the third opening 27c of the first valve body 32 and the second discharge port P22.

[0087] [Fourth switching state] Figure 17 shows the fourth switching state of the pump of this embodiment, which is a state in which the switching valve 31 is rotated 210° counterclockwise (towards the second rotation direction R2) from the first switching state.

[0088] In this fourth switching state, the second intake port P12 is open, but the first valve body portion 32 is in the fourth switching state shown in Figure 8, the first discharge port P21 is closed by the first blocking wall portion 26a, and the second discharge port P22 is closed by the third blocking wall portion 26c, so all flow paths are blocked and the valve is in a closed state.

[0089] 18 to 20 show a modification of this embodiment.

[0090] In this modified example, the relative positional relationship (positional relationship in the rotational direction) between the first valve body portion 32 and the second valve body portion 35 is changed so that when the first valve body portion 32 is in the first switching state shown in Figure 5, the second valve body portion 35 is rotated 90 degrees counterclockwise relative to the second embodiment (Figure 14) as shown in Figure 18.

[0091] 18, both suction ports P11 and P12 are opened, and fluid flows into the pump chamber 13 from both suction pipes 73 and 74 (see arrows W4 and W5). Then, the fluid is discharged from the first discharge pipe 16 through the second opening 27b (see FIG. 5) of the first valve body 32 and the first discharge port P21.

[0092] In addition, in the second switching state in which the switching valve 31 is rotated 180° counterclockwise (towards the second rotation direction R2) from the first switching state, as shown in Figure 19, both suction ports P11, P12 are opened as in the first switching state, and fluid flows into the pump chamber 13 from both suction pipes 73, 74 (see arrows W4, W5), but the discharge port has been switched to the second discharge port P22 by the first valve body portion 32 (see Figure 6) in the second switching state, and fluid is discharged from the second discharge pipe 17.

[0093] Furthermore, in a third switching state obtained by rotating the pump 10 counterclockwise (in the second rotation direction) by 270° from the first switching state, the first suction port P11 is opened and the second suction port P12 is closed, as shown in Fig. 20. The first valve body 32 is also in the third switching state (see Fig. 7) in which both discharge ports P21 and P22 are opened. Therefore, the fluid flows from the first suction pipe P11 into the pump chamber 13 (see arrow W4) and is discharged from both discharge pipes (the first discharge pipe 16 and the second discharge pipe 17).

[0094] In addition, in the fourth switching state, which is rotated 210° counterclockwise (in the second rotation direction) from the first switching state, both discharge ports P21, P22 are closed by the first valve body portion (see Figure 8), resulting in a closed valve state in which the flow path is blocked, as in the second embodiment.

[0095] In this way, by changing the relative positional relationship between the first valve body portion 32 that opens and closes the discharge ports P21, P22 and the second valve body portion 35 that opens and closes the intake ports P11, P12, it is possible to construct a pump that can achieve different switching states. [Explanation of symbols]

[0096] A rotation axis (central axis) P11 Inlet (1st inlet) P12 2nd intake port P21 1st discharge port P22 2nd outlet P23,P24 outlet W1,W2,W3,W4,W5 Fluid flow 11,71 Pump 12. Case 13 Pump Room 13a Inner surface of pump chamber 14 Lid 14a Cylindrical part of the lid 15 Suction pipe 16 1st discharge pipe 17 2nd discharge pipe 21 Impeller 22 Top plate 23 Bottom plate part 24 Feather 25 High ground 26,75 Shielding wall 26a 1st shielding wall part 26b Second shielding wall part 26c 3rd shielding wall part 27,76 Opening part 27a 1st hole 27b 2nd hole 27c 3rd hole 31 Switching valve 32 Valve body portion (first valve body portion) 33 Support part 33a Tooth 34 Arm section 35 Second valve body 41 Electric motor 42 Rotor 43 Stator 44 coils 45 Resin mold cover 46 Shaft 47 Bearing materials 48 Legs 51 One-way clutch (cam clutch) 61 Ratchet mechanism 62 Locking pin 72 Suction chamber 73 1st suction pipe 74 2nd suction pipe

Claims

1. a pump chamber having an intake port for sucking in a fluid and two or more discharge ports for discharging the fluid; an electric motor capable of generating a rotational driving force in a first rotational direction and a rotational driving force in a second rotational direction opposite to the first rotational direction; an impeller that is rotatably provided within the pump chamber and is rotationally driven by the electric motor to cause the fluid to flow from the suction port into the pump chamber and then flow out of the fluid from the discharge port; a switching valve having a valve body portion that opens and closes the discharge port, the switching valve being rotationally driven by the electric motor via the impeller; A pump comprising: The valve body portion is two or more blocking wall portions that close the discharge port; two or more openings that open the discharge port; and the two or more blocking wall portions and the two or more opening portions are arranged so as to surround the impeller, and are arranged alternately in a circumferential direction of the valve body portion so as to open or close the discharge port depending on a rotational position of the valve body portion, the two or more discharge ports are formed on an inner peripheral surface of the pump chamber around the impeller so as to follow an outer peripheral surface of the valve body portion, The pump a one-way rotation transmission mechanism interposed between the impeller and the switching valve, which transmits the rotational drive force in the second rotation direction from the impeller to the switching valve, but does not transmit the rotational drive force in the first rotation direction from the impeller to the switching valve; Equipped with A pump characterized by:

2. the switching valve has a support portion that supports the valve body portion and rotates together with the valve body portion, The one-way rotation transmission mechanism is a one-way clutch provided between the support portion and the impeller.

2. The pump of claim 1.

3. a one-way rotation prevention mechanism that allows the switching valve to rotate in the second rotation direction but prevents the switching valve from rotating in the first rotation direction; Further equipped 3. A pump according to claim 1 or 2.

4. the switching valve has a support portion that supports the valve body portion and rotates together with the valve body portion, The one-way rotation prevention mechanism is a ratchet mechanism provided so as to be interposed between the support portion and the inner surface of the pump chamber.

4. The pump of claim 3.

5. The impeller and the valve body are arranged coaxially. A pump according to any one of claims 1 to 4.

6. the discharge port includes a first discharge port and a second discharge port, which are respectively disposed at positions opposite to each other across the rotation axis of the valve body portion; The valve body portion is The openings include a first opening, a second opening, and a third opening, The shielding wall portion includes a first shielding wall portion, a second shielding wall portion, and a third shielding wall portion, the first opening and the third opening are formed at positions opposite to each other across a rotation axis of the valve body, the second opening is formed between the first opening and the third opening in the circumferential direction of the valve body, the first shielding wall portion extends between the first opening portion and the second opening portion, the second shielding wall portion extends between the second opening portion and the third opening portion, The third shielding wall portion extends between the third opening portion and the first opening portion. A pump according to any one of claims 1 to 5.

7. When the direction parallel to the rotation axis of the impeller is defined as the up-down direction, The suction port is provided on a bottom surface of the pump chamber below the impeller, The electric motor is provided above the impeller. A pump according to any one of claims 1 to 6.

8. a pump chamber having two or more intake ports for sucking in a fluid and two or more discharge ports for discharging the fluid; an electric motor capable of generating a rotational driving force in a first rotational direction and a rotational driving force in a second rotational direction opposite to the first rotational direction; an impeller that is rotatably provided within the pump chamber and is rotationally driven by the electric motor to cause the fluid to flow from the suction port into the pump chamber and then flow out of the fluid from the discharge port; a switching valve having a first valve body portion that opens and closes the discharge port and a second valve body portion that opens and closes the suction port, the switching valve being rotationally driven by the electric motor via the impeller; A pump comprising: The first valve body portion is two or more blocking wall portions that close the discharge port; two or more openings that open the discharge port; and the two or more blocking wall portions and the two or more opening portions are arranged so as to surround the impeller, and are arranged alternately in a circumferential direction of the valve body portion so as to open or close the discharge port depending on a rotational position of the valve body portion, the two or more discharge ports are formed on an inner peripheral surface of the pump chamber around the impeller so as to follow an outer peripheral surface of the valve body portion, the second valve body portion rotates together with the first valve body portion to open and close the suction port; The pump a one-way rotation transmission mechanism interposed between the impeller and the switching valve, which transmits the rotational drive force in the second rotation direction from the impeller to the switching valve, but does not transmit the rotational drive force in the first rotation direction from the impeller to the switching valve; Equipped with A pump characterized by:

9. the switching valve has a support portion that supports the first valve body portion and the second valve body portion and rotates together with the first valve body portion and the second valve body portion, The one-way rotation transmission mechanism is a one-way clutch provided between the support portion and the impeller.

9. The pump of claim 8.

10. a one-way rotation prevention mechanism that allows the switching valve to rotate in the second rotation direction but prevents the switching valve from rotating in the first rotation direction; Further equipped 10. A pump according to claim 8 or 9.

11. the switching valve has a support portion that supports the first valve body portion and the second valve body portion and rotates together with the first valve body portion and the second valve body portion, The one-way rotation prevention mechanism is a ratchet mechanism provided so as to be interposed between the support portion and the inner surface of the pump chamber.

11. The pump of claim 10.

12. The impeller, the first valve body portion, and the second valve body portion are arranged coaxially. A pump according to any one of claims 8 to 11.

13. the discharge port includes a first discharge port and a second discharge port, which are respectively arranged at positions opposite to each other across the rotation axis of the first valve body portion; The first valve body portion is The openings include a first opening, a second opening, and a third opening, The shielding wall portion includes a first shielding wall portion, a second shielding wall portion, and a third shielding wall portion, the first opening and the third opening are formed at positions opposite to each other across a rotation axis of the valve body, the second opening is formed between the first opening and the third opening in the circumferential direction of the valve body, the first shielding wall portion extends between the first opening portion and the second opening portion, the second shielding wall portion extends between the second opening portion and the third opening portion, The third shielding wall portion extends between the third opening portion and the first opening portion. A pump according to any one of claims 8 to 12.

14. The second valve body portion is It has a cylindrical shape, The valve body is provided coaxially with the first valve body portion, the air intake includes one or more blocking wall portions that close the air intake port and one or more opening portions that open the air intake port; the blocking wall portion and the opening portion are arranged along the circumferential direction of the second valve body portion so as to open or close the suction port depending on the rotational position of the second valve body portion; the pump has a cylindrical suction chamber that accommodates the second valve body portion so as to be slidable and rotatable, The two or more suction ports are open to the inner peripheral surface of the suction chamber. A pump according to any one of claims 8 to 13.

15. When the direction parallel to the rotation axis of the impeller is defined as the up-down direction, The suction chamber is provided on a lower surface of the pump chamber, The electric motor is provided above the impeller.

15. The pump of claim 14.

Images