JP6551130B2 - Electric water pump - Google Patents

Description

  The present invention relates to an electric water pump.

  Conventionally, an electric water pump comprising a pump case having a pump chamber, an impeller rotatably accommodated in the pump chamber, a rotor integrally provided rotatably with the impeller, and a stator forming a rotating magnetic field on the rotor Are known (see, for example, Patent Document 1).

  In such an electric water pump, when the rotating magnetic field is formed by the stator, the impeller rotates with the rotor, and the liquid is sucked into the pump chamber from the inlet formed in the pump case, and the liquid is formed in the pump case Discharged from the outlet.

Japanese Patent No. 40111654

  By the way, in such a system using an electric water pump, it may be desired to prevent liquid from flowing from the upstream side to the downstream side of the electric water pump through the electric water pump when the electric water pump is stopped. .

  As a technique for preventing liquid from flowing from the upstream side to the downstream side of the electric water pump through the electric water pump in this way, for example, an electric valve or the like is provided between the upstream side of the electric water pump and the inlet of the electric water pump. It is conceivable to interpose the drive unit.

  However, when a drive unit such as an electric valve is used in this way, the number of parts increases and the cost increases. Therefore, it is desirable that the flow of liquid from the inlet to the outlet can be restricted when the electric water pump is stopped without using a drive unit such as an electric valve.

  The present invention has been made in view of the above problems, and it is an object of the present invention to restrict the flow of liquid from the inlet to the outlet when the electric water pump is stopped without using a drive unit such as an electric valve. To do.

  The electric water pump according to claim 1 includes a pump case, a pump case having an inlet and an outlet respectively communicating with the pump chamber, a plurality of blades arranged radially, and a space between the plurality of blades. And an impeller rotatably received in the pump chamber, a rotor rotatably and axially movable integrally with the impeller, and a flow passage for conveying liquid from the inlet to the outlet. By having an axial magnetic centerline axially offset with respect to the axial magnetic centerline of the rotor, an attraction force to one side in the axial direction is applied to the rotor, and a rotating magnetic field is applied to the rotor when energized. And the impeller and the rotor are caused by the suction force acting on the rotor when the stator is de-energized. In the state of moving to one side in the direction, the communication between the flow path and the outlet is cut off, and the impeller and the rotor are pivoted by the negative pressure of the pump chamber accompanying the rotation of the impeller when the stator is energized. In a state of moving to the other side in the direction, a valve structure portion that communicates the flow path and the outlet is provided.

  In the electric water pump according to the first aspect, the impeller and the rotor move to one side in the axial direction by the attractive force of the stator acting on the rotor when the stator is not energized. And in this state, communication with the flow path and outlet between a plurality of blades provided in the impeller is blocked by the valve structure. On the other hand, when the stator is energized, the impeller and the rotor move to the other side in the axial direction due to the negative pressure in the pump chamber accompanying the rotation of the impeller. Communication with outlets.

  Here, according to the electric water pump of claim 1, as described above, when the stator is not energized, the suction force of the stator acts on the rotor, whereby the impeller and the rotor move to one side in the axial direction, Communication between the flow path between the plurality of blades and the outlet is blocked by the valve structure. Therefore, it is possible to restrict the flow of liquid from the inlet to the outlet when the electric water pump is stopped without using a drive unit such as an electric valve.

  The electric water pump according to claim 2 is the electric water pump according to claim 1, wherein the valve structure portion is formed in a peripheral wall portion of the pump chamber and communicates with the pump chamber and the outlet. A closed portion formed at an edge of the communication hole, and in a state in which the impeller and the rotor are moved to one side in the axial direction, the closed portion closes the flow passage, In the state where the communication with the outlet is shut off and the impeller and the rotor move to the other side in the axial direction, the flow passage and the outlet are communicated through the communication hole.

  According to the electric water pump of claim 2, the valve structure portion has a simple structure having the communication hole formed in the peripheral wall portion of the pump chamber and the closing portion formed in the edge portion of the communication hole. Therefore, an increase in cost can be suppressed.

  The electric water pump according to claim 3 is the electric water pump according to claim 1 or 2, wherein the valve structure portion is formed on a peripheral wall portion of the pump chamber, and the pump chamber communicates with the outlet. And the closing portion formed in the impeller, and in a state in which the impeller and the rotor are moved to one side in the axial direction, the communication hole is closed by the closing portion and the flow passage In the state where the communication with the outlet is shut off and the impeller and the rotor move to the other side in the axial direction, the flow passage and the outlet are communicated through the communication hole.

  According to the electric water pump of the third aspect, the valve structure has a simple structure including the communication hole formed in the peripheral wall of the pump chamber and the closing portion formed in the impeller. Can be suppressed.

  The electric water pump according to claim 4 comprises a pump case having a pump chamber, an inlet and an outlet respectively communicating with the pump chamber, a first cover provided with a plurality of radially arranged vanes, and And a flow path formed between the plurality of vanes and transporting the liquid from the inlet to the outlet. An impeller rotatably received in the pump chamber, a rotor integrally rotatable with the first cover, a stator forming a rotating magnetic field on the rotor when energized, and a second cover provided with the rotor The outlet of the flow passage is closed when the second cover is disposed at the outlet of the flow passage and the second cover approaches the first cover when the impeller is stopped, and In sometimes it states that the second cover by the pressure of the liquid flowing into the flow path is spaced from the first cover, and a valve structure for releasing the outlet of the channel.

  In the electric water pump according to claim 4, when the stator is de-energized and the impeller is stopped, the second cover is in a state of approaching the first cover. In this state, the outlet of the flow path is closed by the valve structure. On the other hand, when the stator is energized and the impeller is rotating, the second cover is separated from the first cover by the pressure of the liquid flowing into the flow path. In this state, the outlet of the flow path is opened by the valve structure. The

  Here, according to the electric water pump of the fourth aspect, as described above, when the stator is not energized and the impeller is stopped, the second cover is brought close to the first cover, and the flow path The outlet of the valve is closed by the valve structure. Therefore, it is possible to restrict the flow of liquid from the inlet to the outlet when the electric water pump is stopped without using a drive unit such as an electric valve.

It is a longitudinal cross-sectional view of the electric water pump concerning a first embodiment of the present invention, and is a figure showing the state at the time of a stop of an electric water pump. It is a figure which shows the state at the time of the action | operation of the electric water pump shown by FIG. It is a longitudinal cross-sectional view of the electric water pump which concerns on 2nd embodiment of this invention, Comprising: It is a figure which shows the state at the time of the stop of an electric water pump. It is a figure which shows the state at the time of the action | operation of the electric water pump shown by FIG.

First Embodiment
First, a first embodiment of the present invention will be described.

  As shown in FIGS. 1 and 2, the electric water pump 10 according to the first embodiment of the present invention has a pump case 12, a motor housing 14, an impeller 16, a rotor 18, a stator 20, and a valve structure. Part 22. In addition, arrow A1, A2 shown by each figure has each shown the axial direction one side and the other side of each part.

  The pump case 12 includes a pump chamber 24 and an inlet 26 and an outlet 28 that communicate with the pump chamber 24, respectively. The pump chamber 24 is formed in a circular shape as viewed in the axial direction of the pump case 12, and is open on one side in the axial direction of the pump case 12.

  The inlet 26 is disposed on the other axial side of the pump chamber 24 and extends in the axial direction of the pump chamber 24. A cylindrical connected portion 30 protruding into the pump chamber 24 is formed on the inlet 26 on the pump chamber 24 side. The outlet 28 is disposed radially outside the pump chamber 24 and extends in the tangential direction of the pump chamber 24.

  The motor housing 14 is disposed on one axial side of the pump case 12. The motor housing 14 is formed in a bottomed cylindrical shape that opens to the pump case 12 side, and is assembled to the pump case 12.

  The impeller 16 includes a first cover 32, a second cover 34, and a plurality of blades 36. The second cover 34 is assembled to the first cover 32 from the other axial side of the first cover 32, and is fixed to the first cover 32 by screws 38. The plurality of blades 36 are provided on the first cover 32 and are arranged in a spiral shape. Between the plurality of blades 36, a flow path 40 for transporting liquid from the inlet 26 to the outlet 28 is formed.

  The impeller 16 is accommodated in the pump chamber 24 so as to be rotatable and movable in the axial direction of the pump chamber 24. In FIG. 1, the impeller 16 is moved to one side in the axial direction of the pump chamber 24, and in FIG. 2, the impeller 16 is moved to the other side in the axial direction of the pump chamber 24. The first cover 32 is formed with a cylindrical connecting portion 42 that protrudes toward the connected portion 30 side. The connected portion 30 is inserted inside the connecting portion 42. The flow passage 40 formed inside the impeller 16 is in communication with the inlet 26 through the inside of the connected portion 30 and the connecting portion 42.

  The rotor 18 is formed in a cylindrical shape, and is disposed coaxially with the impeller 16 on one side in the axial direction of the impeller 16. A plurality of magnetic poles are formed on the outer periphery of the rotor 18. A through hole 44 is formed in the shaft core portion of the rotor 18, and a shaft 46 is inserted into the through hole 44. By inserting the shaft 46 into the through hole 44, the rotor 18 is rotatably supported by the shaft 46 and is movable in the axial direction with respect to the shaft 46.

  The rotor 18 is integrated with the impeller 16, and can rotate integrally with the impeller 16 and can move in the axial direction. In FIG. 1, the rotor 18 is moved to one side in the axial direction together with the above-described impeller 16, and in FIG. 2, the rotor 18 is moved to the other side in the axial direction along with the above-described impeller 16. The axial one end of the shaft 46 is fixed to a fixed portion 48 provided at the bottom of the motor housing 14, and the other axial end of the shaft 46 is for preventing the rotor 18 from coming off. The retaining portion 50 is provided.

  The stator 20 is formed in an annular shape and is disposed around the rotor 18. The axial magnetic center line 52 of the stator 20 is offset to the side opposite to the impeller 16 side with respect to the axial magnetic center line 54 of the rotor 18. The axial magnetic center line 52 of the stator 20 is a line passing through the center of the magnetic balance in the axial direction of the stator 20, and the axial magnetic center line 54 of the rotor 18 passes the center of the magnetic balance in the axial direction of the rotor 18. Is a line.

  And, by having the axial magnetic center line 52 axially offset with respect to the axial magnetic center line 54 of the rotor 18, the stator 20 always moves from the stator 20 to one side in the axial direction with respect to the rotor 18. A suction force is applied. The stator 20 forms a rotating magnetic field in the rotor 18 when energized. A can (partition) (not shown) is provided between the rotor 18 and the stator 20.

  The valve structure 22 has a communication hole 56, a closing part 58, and a closing part 60. The communication hole 56 is formed in the peripheral wall portion of the pump chamber 24, and communicates the pump chamber 24 and the outlet 28. The closing part 58 is formed at the edge part (the edge part on the motor housing 14 side) of the communication hole 56, and the closing part 60 is formed at the outer peripheral part of the second cover 34. The details of the valve structure 22 will be described together with the operation of the electric water pump 10 later.

  Next, the operation of the electric water pump 10 according to the first embodiment of the present invention will be described.

  As shown in FIG. 1, when the stator 20 is not energized, the attraction force of the stator 20 acts on the rotor 18 so that the impeller 16 and the rotor 18 are moved to one side in the axial direction (arrow A1 side). In this state, the communication between the flow passage 40 between the plurality of blades 36 and the outlet 28 is blocked by the valve structure 22.

  That is, in a state in which the impeller 16 and the rotor 18 are moved to one side in the axial direction, the flow path 40 is closed by the closed part 58 by facing the outlet of the flow path 40 and the inlet of the communication hole 56. The communication hole 56 is closed by the closing part 60 when the closing part 60 is opposed thereto. Thereby, the communication between the flow path 40 and the outlet 28 is blocked.

  On the other hand, as shown in FIG. 2, when the stator 20 is energized, a rotating magnetic field is formed by the stator 20 and the impeller 16 rotates with the rotor 18. The impeller 16 and the rotor 18 are moved to the other side in the axial direction (arrow A <b> 2 side) because the pump chamber 24 becomes negative pressure as the impeller 16 rotates. In this state, the flow path 40 and the outlet 28 communicate with each other through the valve structure 22.

  That is, in a state in which the impeller 16 and the rotor 18 move to the other side in the axial direction, the closed portion 58 deviates with respect to the outlet of the flow passage 40 and the closed portion 60 deviates with respect to the inlet of the communication hole 56 In addition, the outlet of the flow path 40 and the inlet of the communication hole 56 face each other. As a result, the flow path 40 and the outlet 28 communicate with each other through the communication hole 56.

  1 and 2, for easy understanding of the valve structure 22, the pump chamber having the communication hole 56 and the closing portion 58, the outer peripheral portion of the impeller 16 having the outlet of the flow passage 40 and the closing portion 60. The distance to the peripheral wall portion 24 is exaggerated.

  Next, the operation and effects of the first embodiment of the present invention will be described.

  As described above in detail, in the electric water pump 10 according to the first embodiment of the present invention, as shown in FIG. 1, the suction force of the stator 20 acts on the rotor 18 when the stator 20 is not energized. The rotor 16 and the rotor 18 move axially to one side. In this state, communication between the flow path 40 and the outlet 28 between the plurality of blades 36 provided on the impeller 16 is blocked by the valve structure 22. On the other hand, as shown in FIG. 2, when the stator 20 is energized, the pump chamber 24 becomes negative pressure as the impeller 16 rotates, so that the impeller 16 and the rotor 18 move to the other side in the axial direction. The valve structure 22 communicates the flow path 40 and the outlet 28.

  Here, according to the electric water pump 10 according to the first embodiment of the present invention, as described above, the suction force of the stator 20 acts on the rotor 18 when the stator 20 is not energized, so that the impeller 16 and the rotor 18 are operated. Moves to one side in the axial direction, and the communication between the flow passage 40 between the plurality of blades 36 and the outlet 28 is interrupted by the valve structure 22. Therefore, the flow of the liquid from the inlet 26 to the outlet 28 can be limited when the electric water pump 10 is stopped without using a drive unit such as an electric valve. Thereby, size reduction, cost reduction, and low power consumption of the electric water pump 10 can be achieved.

  Further, according to the electric water pump 10 according to the first embodiment of the present invention, the valve structure portion 22 is formed in the communication hole 56 formed in the peripheral wall portion of the pump chamber 24 and the edge portion of the communication hole 56 The simple structure having the closing portion 58 and the closing portion 60 formed in the impeller 16 can suppress cost increase.

  Next, a modification of the first embodiment of the present invention will be described.

  In the first embodiment of the present invention described above, the valve structure 22 includes the communication hole 56 formed in the peripheral wall of the pump chamber 24, the closed portion 58 formed in the edge of the communication hole 56, and the impeller 16. And a closure 60 formed. However, either one of the closing part 58 and the closing part 60 may be omitted from the valve structure part 22.

  Further, in the first embodiment of the present invention described above, the closing portion 60 is formed on the outer peripheral portion of the second cover 34, but is formed on the impeller 16 at a place other than the outer peripheral portion of the second cover 34 Also good.

  Further, in the first embodiment of the present invention described above, the impeller 16 includes the first cover 32 and the second cover 34, but may have a structure in which the second cover 34 is omitted.

Second Embodiment
Next, a second embodiment of the present invention will be described.

  The structure of the electric water pump 70 according to the second embodiment of the present invention shown in FIGS. 3 and 4 is changed as follows, with respect to the electric water pump 10 according to the first embodiment described above.

  That is, the second cover 34 of the impeller 16 can be brought into contact with and separated from the first cover 32 in the axial direction of the pump chamber 24. In FIG. 3, the state in which the second cover 34 approaches the first cover 32 (moving to one side in the axial direction) is shown, and in FIG. 4, the second cover 34 is separated from the first cover 32. The state (moving to the other side in the axial direction) is shown.

  The second cover 34 moves in the direction away from the first cover 32 along the shaft portion of the screw 38, and is prevented from coming off from the first cover 32 by the head of the screw 38. In the second embodiment of the present invention, the second cover 34 has a connecting portion 42, but the connected portion 30 (see FIGS. 1 and 2) is omitted from the pump case 12.

  Further, the electric water pump 70 according to the second embodiment of the present invention has a valve structure portion 72 provided on the outer peripheral portion of the second cover 34. The valve structure 72 is formed in a wall shape extending from the outer periphery of the second cover 34 toward the first cover 32, and is disposed at the outlet of the flow path 40. The details of the valve structure 72 will be described together with the operation of the electric water pump 70 later.

  Next, the operation of the electric water pump 70 according to the second embodiment of the present invention will be described.

  As FIG. 3 shows, the electric water pump 70 which concerns on 2nd embodiment is arrange | positioned by making a perpendicular direction into an axial direction. Then, when the stator 20 is not energized, the impeller 16 is stopped, and the liquid does not flow into the flow path 40 between the plurality of blades 36. Therefore, the pressure of the fluid does not act on the flow path 40, and the second cover 34 It will be in the state which approached the 1st cover 32 with dead weight. In this state, the outlet of the flow path 40 is closed by the valve structure 72, and the communication between the flow path 40 and the outlet 28 is blocked.

  On the other hand, as shown in FIG. 4, when the stator 20 is energized, a rotating magnetic field is formed by the stator 20 and the impeller 16 rotates with the rotor 18. Then, as the impeller 16 rotates, the liquid flows from the inlet 26 into the flow path 40, and the flow path 40 becomes positive pressure. The second cover 34 is separated from the first cover 32 by the pressure of the liquid flowing into the flow path 40. In this state, the outlet of the flow path 40 is opened by the valve structure 72, and the flow path 40 and the outlet 28 communicate with each other.

  3 and 4, for easy understanding of the valve structure 72, the outer periphery of the impeller 16 having the outlet of the flow passage 40 and the valve structure 72, and the peripheral wall of the pump chamber 24 having the communication hole 56. The space between the parts is shown exaggerated.

  Next, the operation and effects of the second embodiment of the present invention will be described.

  As described above in detail, in the electric water pump 70 according to the second embodiment of the present invention, as shown in FIG. 3, when the stator 20 is not energized and the impeller 16 is stopped, the second cover 34 is The first cover 32 is approached. In this state, the outlet of the flow path 40 is closed by the valve structure 72. On the other hand, as shown in FIG. 4, when the stator 20 is energized and the impeller 16 is rotating, the pressure of the liquid flowing into the flow passage 40 separates the second cover 34 from the first cover 32, and this state Then, the outlet of the flow passage 40 is opened by the valve structure 72.

  Here, according to the electric water pump 70 according to the second embodiment of the present invention, as described above, when the stator 20 is not energized and the impeller 16 is stopped, the second cover 34 is used as the first cover 32. The close state is established, and the outlet of the flow path 40 is closed by the valve structure 72. Therefore, the flow of the liquid from the inlet 26 to the outlet 28 can be restricted when the electric water pump 70 is stopped without using a drive unit such as an electric valve. Thereby, size reduction, cost reduction, and low power consumption of the electric water pump 70 can be achieved.

  Further, according to the electric water pump 70 according to the second embodiment of the present invention, the valve structure portion 72 has a simple wall-like structure extending from the outer peripheral portion of the second cover 34 to the first cover 32 side. Therefore, an increase in cost can be suppressed.

  Next, a modification of the second embodiment of the present invention will be described.

  In the second embodiment of the present invention described above, the electric water pump 70 is disposed with the vertical direction as the axial direction, and when the stator 20 is not energized, the second cover 34 approaches the first cover 32 by its own weight. However, the second cover 34 may approach the first cover 32 when the stator 20 is not energized, for example, by being biased toward the first cover 32 by an elastic member or the like. Further, in this case, the electric water pump 70 may be arranged with the direction other than the vertical direction as the axial direction.

  As mentioned above, although the first and second embodiments of the present invention have been described, the present invention is not limited to the above, and besides the above, various modifications can be made without departing from the scope of the present invention Of course there is.

DESCRIPTION OF SYMBOLS 10 ... Electric water pump, 12 ... Pump case, 14 ... Motor housing, 16 ... Impeller, 18 ... Rotor, 20 ... Stator, 22 ... Valve structure part, 24 ... Pump chamber, 26 ... Inlet, 28 ... Outlet, 30 ... Subject Connection part 32 first cover 34 second cover 36 blade 38 screw 40 flow path 42 connection part 44 through hole 46 shaft 48 fixing part 50 Part, 52, 54 ... axial magnetic center line, 56 ... communication hole, 58 ... closing part, 60 ... closing part, 70 ... electric water pump, 72 ... valve structure part

Claims (4)

A pump case having a pump chamber and an inlet and an outlet respectively communicating with the pump chamber;
An impeller having a plurality of blades arranged radially and having a flow path for transporting liquid from the inlet to the outlet between the plurality of blades, and rotatably accommodated in the pump chamber;
A rotor that is rotatable integrally with the impeller and movable in the axial direction;
By having an axial magnetic center line axially offset with respect to the axial magnetic center line of the rotor, a suction force to one side in the axial direction is applied to the rotor, and the rotor rotates when the current is supplied. A stator that forms a magnetic field;
In a state where the impeller and the rotor are moved to one side in the axial direction by the suction force acting on the rotor when the stator is not energized, the communication between the flow path and the outlet is interrupted, and the stator is energized. In a state where the impeller and the rotor are moved to the other side in the axial direction because the pump chamber becomes negative pressure with the rotation of the impeller sometimes, a valve structure unit that communicates the flow path and the outlet;
Electric water pump equipped with The valve structure portion includes a communication hole formed in a peripheral wall portion of the pump chamber and communicating the pump chamber and the outlet, and a closed portion formed at an edge portion of the communication hole, the impeller and the valve In a state in which the rotor is moved to one side in the axial direction, the flow passage is closed by the closing portion to shut off the communication between the flow passage and the outlet, and the impeller and the rotor are moved to the other side in the axial direction In the state, the flow passage and the outlet are communicated with each other through the communication hole,
The electric water pump according to claim 1. The valve structure portion has a communication hole formed in a peripheral wall portion of the pump chamber and communicating the pump chamber and the outlet, and a closing portion formed in the impeller, and the impeller and the rotor are axially When the closing portion closes the communication hole in the state of moving to one side, the communication between the flow path and the outlet is shut off, and in the state of moving the impeller and the rotor to the other side in the axial direction, Connecting the flow path and the outlet through the communication hole;
The electric water pump of Claim 1 or Claim 2. A pump case having a pump chamber and an inlet and an outlet respectively communicating with the pump chamber;
A first cover provided with a plurality of blades arranged radially, a second cover capable of contacting and separating in the axial direction of the pump chamber with respect to the first cover, and formed between the plurality of blades An impeller rotatably accommodated in the pump chamber, and a flow path for conveying a liquid from the inlet to the outlet;
A rotor rotatable integrally with the first cover;
A stator that forms a rotating magnetic field on the rotor when energized;
The outlet of the flow passage is closed when the second cover is provided and disposed at the outlet of the flow passage and the second cover approaches the first cover when the impeller is stopped, and the impeller is rotated. A valve structure that opens the outlet of the flow path when the second cover is separated from the first cover due to the pressure of the liquid flowing into the flow path;
Electric water pump equipped with

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