JPH09137790A - Bidirectional pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bidirectional pump certain in motion, large in flow rate and simple in structure. SOLUTION: Axes of a pair of outflow ports 51 , 52 provided on a pump case 1 are roughly in parallel with each other. A reversing body 40 furnished with a pair of blocking plates 421 , 422 and formed roughly in an L shape is installed free to oscillate in the pump case 1 between these outflow ports 51 , 52 . This reversing body 40 is oscillated by movement of a fluid caused by revolution of an impeller 20, and the outflow ports 51 , 52 are separately blocked free to open and close by the blocking plates 421 , 422 . Additionally, as the blocking plates 421 , 422 open and close the outflow ports 51 , 52 along the axial direction of the outflow ports 51 , 52 , no frictional force is generated between margins of the outflow ports 51 , 52 as a conventional example. Furthermore, the reversing body 40 selects the outflow ports 51 , 52 and simultaneously form a flow passage. Consequently, changeover motion of the reversing body 40 is certainly carried out, and a flow rate is never reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional pump that selectively allows a fluid to flow into an inside of a pump case from an inflow port to flow out from only one of a pair of outflow ports provided in the pump case.

[0002]

2. Description of the Related Art Conventionally, it is necessary to change the flow direction of a fluid by 2
It has been common to use a valve such as a one-way valve or a three-way valve, or a bidirectional pump as described above. FIG. 9-
FIG. 11 shows a conventional example of such a bidirectional pump. In these bidirectional pumps, a pair of outflow ports 51 are provided in a pump case 50 into which fluid is introduced from an inflow port (not shown), and a forward and reverse operation is performed by a motor or the like. The impeller 53 rotatable in both directions has a common basic structure housed in the pump case 50.

In the conventional example shown in FIG. 9, an outlet 51 is provided at the lower end.
A pair of outflow pipes 52 are provided in the pump case 50 with their axes substantially parallel to each other.
A substantially fan-shaped flapper 54 having an arc-shaped closing body 54a for selectively closing each of the outlets 51 is rotatably attached around the rotating shaft 53a of the impeller 53. Less than,
The operation of this conventional example will be briefly described with reference to FIG. However, in the following description, left, right, top, bottom, etc. all represent the directions, directions, etc. in FIG. First, as shown in the figure, when the impeller 53 is rotated clockwise, the flapper 54 is also rotated clockwise by the fluid moving in the pump case 50, so that the right outlet 51 is The flapper 54 is closed by the closing body 54a, and the fluid in the pump case 50 flows out only from the left outlet 51. On the contrary, when the rotation direction of the impeller 53 is reversed and rotated counterclockwise, the flapper 54 also reversely rotates counterclockwise to close the left outlet 51 and at the same time to the right flow. Since the outlet 51 is opened, the fluid in the pump case 50 flows out only from the outlet 51 on the right side. That is, by changing the rotation direction of the impeller 53, one of the pair of outlets 51 can be selected and the fluid can be discharged.

Further, in the conventional example shown in FIGS. 10 and 11, a pair of outflow pipes 52 are provided in the pump case 50 so that their axes are substantially aligned with each other, and the pump is provided along the axes of the pair of outflow pipes 52. Float 55 moving in the case 50
The pump case 50 is provided with a and 55b and a wall 56 that restricts the movement range of the floats 55a and 55b. In the case of FIG. 10, the float 55a is formed in a substantially spherical shape, and in the case of FIG. 11, the float 55b is formed in a substantially cylindrical shape having hemispherical portions at both ends. It is common. The operation of this conventional example will be briefly described below with reference to FIG. However, the left, right, up, down, etc. in the following description all represent the directions, directions, etc. in FIGS. 10 and 11. First, as shown in FIG. 10, when the impeller 53 is rotated clockwise, the fluid moving in the pump case 50 moves the float 55a to the right and closes the right outlet 51, so that the pump The fluid in the case 50 will flow out only from the left outlet 51. On the contrary, when the impeller 53 is rotated in the counterclockwise direction by reversing the rotation direction, the float 55a
Moves to the left to close the left outlet 51 and at the same time the right outlet 51 is opened.
The fluid inside 0 flows out only from the outlet 51 on the right side. That is, also in this conventional example, the impeller 53
By changing the turning direction of the fluid, one of the pair of outlets 51 can be selected to cause the fluid to flow out.

[0005]

However, in the conventional example shown in FIG. 9, the sealing performance of the outflow port 51 and the flapper 54.
It will be contrary to the operating performance of. That is, in order to improve the sealing performance of the outflow port 51, if the gap between the outflow port 51 and the closing member 54a of the flapper 54 is reduced, or if the sealing member 57 is attached to each outflow port 51 as shown in FIG. The closing body 54a of the flapper 54 is the outlet 51.
Since the outlet 51 is opened and closed while sliding relative to the outlet 51, the closing member 54a of the flapper 54 and the outlet 51 are closed.
Alternatively, the operating performance of the flapper 54 may be reduced by the frictional force caused by sliding with the seal member 57, and conversely, if the operating performance is to be improved, the sealing performance will be reduced, so that both performances are satisfied at the same time. However, there is a problem in that the flapper 54 and the seal member 57 wear due to the sliding of the flapper 54 and the life of the flapper 54 and the like is shortened.

Further, in the conventional example shown in FIGS. 10 and 11, for example, when the impeller 53 is rotated clockwise, the fluid flow in the movement paths of the floats 55a and 55b is directed rightward, and therefore, originally, If so, the outlet 5 on the right side
Although it requires less resistance to flow out from No. 1, the right side outlet 51 is actually closed by the floats 55a and 55b, so that the fluid has resistance compared to the right side as shown by the arrows in FIGS. Flows out from the outlet 51 on the left side having a large size. The situation is the same when the rotation direction of the impeller 53 is opposite (counterclockwise). The point is that in this conventional example, the impeller 53 is caused to flow out from the outflow port 51 having the larger resistance to the fluid. In addition, there was a problem that the amount of outflow from the outflow port 51 was relatively reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a bidirectional pump having a reliable operation, a large flow rate, and a simple structure.

[0008]

In order to achieve the above object, the invention of claim 1 provides only one of a pair of outlets provided in the pump case for allowing fluid to flow into the pump case from the inlet. A pump case in which a pair of outlets are arranged side by side with their axes in parallel, an impeller rotatably housed in the pump case, and a pump case in the pump case. And a reversing body attached so as to be swingable between the two outflow ports of the reversing body, and the reversing body forms a pair of closing plates that individually open and close the outflow ports substantially along the axial direction of the outflow ports. In addition to being provided, the flow path is oscillated in reverse according to the rotation of the impeller and one of the outlets is closed by one closing plate, and at the same time, the other closing plate forms a flow path to the other outlet. Yes, depending on the direction of rotation of the impeller Rolling swing to be able to selectively flow out only one of the pair of outlet, moreover,
Since the closing plate of the reversing body that opens and closes the outlet port opens and closes substantially along the axial direction of the outlet port, there is no frictional force between the closing plate and the outlet port unlike the conventional example, and it operates. It is possible to achieve both performance and sealing performance, and it is possible to prevent a decrease in life due to wear. Further, since the reversing body is attached between the outlets arranged in parallel to each other, the resistance in the flow path formed by the closing plate of the reversing body becomes small, and the resistance from the outlet is smaller than that in the conventional example. The fluid flow rate can be increased.

According to a second aspect of the present invention, in the first aspect of the present invention, an elastic body for sealing is provided on at least one of the periphery of the outlet and the surface of each closing plate that abuts the periphery of each outlet. The elastic body fills the gap between the outflow port and the closing plate, so that the sealing performance can be improved. According to a third aspect of the invention, in the first aspect of the invention, at least the pair of closing plates included in the reflector are formed of elastic bodies, and the sealing performance can be improved without increasing the number of parts.

[0010] The invention of claim 4 is the invention of claim 1 or 2 or 3.
In the invention described above, the impeller blades are curved in the rotating direction of the impeller, and the flow rate from each outlet can be varied depending on the rotating direction of the impeller.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, a DC motor 31 is attached to the pump case 1 by a motor mount 30, and the power of the DC motor 31 is rotatably stored in the pump case 1 by a power transmission means 32 described later. It is transmitted to the impeller 20 that is rotated, and the impeller 20 is rotatable both clockwise and counterclockwise in FIG.

The pump case 1 is composed of a box-shaped body 2 having an outer flange-shaped flange 2a on the periphery of the opening end, and a cover 10 for sealing the opening of the body 2.
An inflow port 3 for allowing a fluid to flow in from the outside is provided on the bottom surface of the body 2, and an inflow pipe 4 communicating with the inflow port 3 is provided so as to project from the outer bottom surface of the body 2. A fixed base 7 to which a shaft (rotating shaft) 21 for pivotally supporting the impeller 20 is fixed is provided near the inflow port 3, and one end of the shaft 21 is inserted and fixed to the fixed base 7. .
Further, provided substantially by parallel pair of outlet 5 _1, 5 ₂ and the axial direction on the side top part 2b adjacent to the bottom surface of the body 2, the outlet 5 ₁ and from the outer surface of the Gawaitadaki portion 2b, 5 ₂
Outflow pipes 6 ₁ and 6 ₂ that communicate with each other are erected substantially parallel to each other. The impeller 20 is attached to the other end of the shaft 21, one end of which is inserted and fixed to the fixed base 7 of the body 2, and the impeller 20 is rotatable about the shaft 21. In addition, the cover 10 that seals the opening surface of the body 2 includes an impeller 20 that is installed inside the body 2.
A main body 11 formed in a bottomed cylindrical shape in accordance with the shape of
Side wall portion 1 integrally formed so as to surround the periphery of the main body 11.
2 and an outer flange portion 13 provided at the peripheral end of the side wall portion 12. With the side wall portion 12 inserted into the body 2, the outer flange portion 13 is brought into contact with the vicinity of the opening peripheral edge of the body 2. Can be installed. That is, the cover 10 serves as a partition wall to prevent the fluid in the pump case 1 from leaking to the DC motor 31 side.

Impeller 2 housed in pump case 1
0 is a cylindrical body portion 22 in which a bearing portion 22a into which the shaft 21 is inserted and fixed is provided substantially in the center, and this bearing portion 22.
The body 22 of the opening side of a is provided with the blades 23 of a flat plate shape which are erected radially around the bearing 22a. Four blades 23 have the same shape, and adjacent blades 23 are provided at an angle of approximately 90 degrees. Further, the body portion 22 of the impeller 20 is adapted to be housed in the main body 11 of the cover 10 which is formed in a bottomed cylindrical shape. Further, a magnet 32 a forming the power transmission means 32 is embedded in the body portion 22 of the impeller 20 so as to face the side wall portion 12 of the main body 11. Needless to say, the number of blades 23 of the impeller 20 is not limited to four and may be three or less or five or more.

The DC motor 31 is mounted and fixed by a fixing screw 33 with the motor shaft 31a inserted through the bottom surface of a motor mounting base 30 formed in a box shape. A disk-shaped base 34 is attached to the tip of the motor shaft 31a, and a magnet 32b is attached near the periphery of the base 34. The magnet 32b attached to the base 34 is attached. And impeller 20
The power transmission means 3 with the magnet 32a embedded in the body portion 22 of the
2 are configured. That is, both magnets 32a and 32b
Is magnetically coupled, the base 34 and the impeller 20 are integrally rotated, and the power of the DC motor 31 can be transmitted to the impeller 20. Also, the motor mount 3
A screw hole 30a is drilled on the opening surface side of the motor mounting base 0, and a mounting screw 35 inserted into a screw insertion hole 2c provided in the flange 2a of the body 2 is screwed into the screw hole 30a to mount the motor mounting base. 30 is fixed to the pump case 1.

Next, the part relating to the reversal body 40, which is the subject matter of the present invention, will be described. In the present embodiment, the pair of rectangular flat plate-shaped closing plates 42 ₁ and 42 ₂ are integrally formed on the outer peripheral surface of the cylindrical bearing body 41 so as to be substantially orthogonal to each other, so that the axial direction of the bearing body 41 is reduced. Seen from L
The inverted body 40 of the shape is constituted. Here, as shown in FIG. 1A, the reversal body 40 is formed so that the intersection of the center lines 42a of the both closing plates 42 ₁ and 42 ₂ coincides with the center point 43a of the swing shaft 43. Then, the swing shaft 43, which is inserted into the bearing body 41 of the reversing body 40, is attached between the two outflow ports 5 ₁ and 5 ₂ in the vicinity of the side top portion 2b to swing the reversing body 40. It is attached to the pump case 1 so as to be swingable around a shaft 43. That is, the reversing member 40 prevents the pressure from the fluid moving in the pump case 1 from closing the plate 4.
By being received by 2 ₁ , 42 ₂ , it swings around the swing shaft 43. At this time, the oscillating range of the reversing body 40 is such that the closing plates 42 ₁ and 42 ₂ of the reversing body 40 are respectively outflow ports 5 ₁ and
5 ₂ would be restricted to the range of up to abut, at the respective closure plate 42 _1, 42 ₂ each outlet by abut 5 _1, 5 ₂ is closed to each other.

Next, referring to FIG. 2, in the present embodiment
Outlet 5₁, 5_TwoThe switching operation of will be described. First,
FIG. 3A shows a state in which the DC motor 31 is stopped.
Most of the fluid in the pump case 1 is moving.
Since it is not present, the reversal body 40 is stationary at a substantially intermediate position.
From there, drive the DC motor 31 to drive the impeller 20.
When rotated clockwise as shown in Figure (b), the pump
Is the fluid in Case 1 on the left as indicated by the arrow in Fig. 2 (b)?
To move to the right from both sides, the both blocking plates 42 of the reversing body 40.₁,
42_TwoHas a force that oscillates counterclockwise
The reversing body 40 is swung, and finally the closing plate 42 on the right side._Two
Is outlet 5 on the right_TwoAbut on the periphery of the outlet 5 _TwoTo
It will be blocked. At this time, the other (left) closing plate
42₁Must be located between the swing shaft 43 and the impeller 20.
And the flow in the pump case 1 flowing from the inlet 3
Outlet 5 on the left side₁Forming a flow path leading to
In addition, as shown in FIG. 3, the closing plate on the left side forming the flow path
42₁To the left F₁Working and outlet 5_Two
Plate 42 for closing the_TwoOutlet 5_TwoDirection to contact
Power of F _TwoAre working,
Outlet 5_TwoEdge and the closing plate 42_TwoThe degree of adhesion with
The sealing property is secured.

On the other hand, when the DC motor 31 is driven in the reverse direction to rotate the impeller 20 in the counterclockwise direction, the moving direction of the fluid in the pump case 1 is reversed from the right to the left, and as shown in FIG. The closing plate 42 that formed the flow path until then
_The leftward force F ₃ acts on ₁ and the reversing body 40 reciprocally swings clockwise. As a result, as shown in FIG. 2 (c), together with the closure plate 42 ₁ of the left closes the outlet 5 ₁ abuts on the left side of the outlet 5 ₁ of the periphery in turn, the other of the closure plate 42 ₂ the flow path of the other to one of the outlet 5 ₂ is to be formed Te.

As described above, the reversal body 40 includes the impeller 20.
By oscillating in reverse according to the turning direction of the closing plate 42 ₁ ,
Since each of the outlets 5 ₁ and 5 ₂ is closed by 42 ₂ , the rotating direction of the impeller 20 is changed to select _one of the pair of outlets 5 ₁ and 5 ₂ , and the outlet 5 _1
The fluid can be made to flow out only from ₁ , 5 ₂ . Moreover, according to this embodiment, the respective closing plates 42 ₁ , 4
2 ₂ rotates around the swing shaft 43 and opens and closes to the outlets 5 ₁ and 5 ₂ , respectively. In other words, the closing plates 42 ₁ and 42 ₂ move in the axial direction of the outlets 5 ₁ and 5 ₂ . The flapper 54 of the conventional example, which is slidably in contact with the peripheral edges of the outlets 5 ₁ and 5 ₂ since it abuts the peripheral edges of the outlets 5 ₁ and 5 ₂ substantially along the
In contrast to the closing plates 42 ₁ and 42 ₂ and the outlets 5 ₁ and 5 ₂
There is no frictional force between and. Therefore, the reversal body 40
And the sealing performance of the closing plates 42 ₁ and 42 _{2 do} not affect each other at all, and the operating performance and the sealing performance can be compatible with each other. In addition, the flow path formed by the closing plates 42 ₁ and 42 ₂ that do not close the outflow ports 5 ₁ and 5 ₂ has resistance against the moving direction of the fluid that occurs according to the rotating direction of the impeller 20. Outlet 5
The flow rate of the fluid flowing out from ₁ , 5 ₂ does not decrease, and the flow rate can be increased as compared with the conventional example.

By the way, the closing plate 42₁, 42_TwoThe seal
In order to improve the performance, as shown in FIG.
2₁, 42_TwoAlternatively, the elastic body 44 may be attached. This elastic
The body 44 is a closing plate 42₁, 42_TwoFit into the opening provided in
It is combined and attached. That is, the closing plate 4
2₁, 42_TwoIs outlet 5₁, 5_TwoWhen closing the outlet
5₁, 5_TwoThe elastic body 44 contacts the periphery of the
Elastic body 44 causes the outlet 5 to₁, 5_TwoPressed against
Therefore, the closing plate 42₁, 42_TwoImproved sealing performance
It can be done. The elastic body 44 is
Outlet 5 as shown in 6 ₁, 5_TwoThe side that touches the periphery of
You may make it bulge outwards, and in this case,
The sealing performance can be improved. Or closed
Plate 42₁, 42 _TwoEven if it is made of elastic material
Good. In addition, the closing plate 42₁, 42_TwoAttach elastic body 44 to
Outlet 5 instead₁, 5_TwoRing-shaped around the
Even if the elastic body 45 is attached, the sealing performance
It is possible to improve.

Although the blades 23 of the impeller 20 are flat in this embodiment, arcuate blades 23 'which are curved in the same direction may be used as shown in FIG. In this case, as shown in FIG. 8B, when the impeller 20 is rotated clockwise, the flow rate flowing out from the outflow ports 5 ₁ , 5 ₂ becomes relatively small, and as shown in FIG. The outlet 5 when the impeller 20 is rotated counterclockwise as shown.
_The flow rate flowing out from ₁ , 5 ₂ is relatively large. Therefore, the driving force of the DC motor 31 is constant (DC motor 3
Even if the voltage or current applied to 1 is constant),
By changing the rotating direction of the impeller 20, the outlets 5 ₁ , 5
The flow rate of the fluid flowing out can be switched at the same time as the switching of ₂ .

As described above, according to the present invention, the operation performance and the sealing performance can be simultaneously improved without reducing the flow rate as compared with the conventional bidirectional pump, and the structure is simple and inexpensive. It is possible to provide a bidirectional pump.

[0022]

According to the first aspect of the present invention, there is provided a bidirectional pump in which a fluid flowing into the pump case from the inlet is selectively discharged from only one of a pair of outlets provided in the pump case. A pump case in which a pair of outlets are arranged side by side with their axes in parallel, an impeller rotatably housed in the pump case, and a swingable installation between both outlets in the pump case. And a pair of closing plates that individually open and close the outlets substantially along the axial direction of the outlets.
As the impeller rotates in reverse and swings, one of the outlets is closed by one blocking plate, and at the same time, the other blocking plate forms a flow path to the other outlet. The reversing body can be oscillated in a reversing manner depending on the situation and can selectively flow out from only one of the pair of outlets. Since it opens and closes substantially along the axial direction, there is no frictional force between the closing plate and the outlet as in the conventional example, it is possible to achieve both operating performance and sealing performance, and the life is shortened due to wear. The effect is that it can be prevented. Further, since the reversing body is attached between the outlets arranged in parallel to each other, the resistance in the flow path formed by the closing plate of the reversing body becomes small, and the resistance from the outlet is smaller than that in the conventional example. There is an effect that the flow rate of the fluid can be increased.

According to the second aspect of the present invention, since the elastic body for sealing is provided on at least one of the peripheral edge of the outflow port and the surface of each closing plate that abuts on the peripheral edge of each outflow port, the elastic body serves as the outflow port. There is an effect that the gap with the closing plate is filled and the sealing performance can be improved. According to the third aspect of the invention, at least the pair of closing plates included in the reflector are formed of the elastic body, so that there is an effect that the sealing performance can be improved without increasing the number of parts.

According to the fourth aspect of the present invention, since the impeller blades are curved in the rotational direction of the impeller, the flow rate from each outlet can be varied depending on the rotational direction of the impeller, and the rotational direction of the impeller can be changed. There is an effect that the outlet can be switched and the flow rate can be switched at the same time by changing.

[Brief description of the drawings]

FIG. 1 shows an embodiment, (a) is a partially cutaway front view, (b) is a partially broken side view, and (c) is a top view.

2A to 2C are cross-sectional views for explaining the operation of the same.

FIG. 3 is a cross-sectional view for explaining the operation of the above.

FIG. 4 is a cross-sectional view for explaining the operation of the above.

FIG. 5 is a cross-sectional view of an essential part showing another configuration of the above-mentioned inverted body.

FIG. 6 is a cross-sectional view of a main part showing still another configuration of the above-mentioned inverted body.

FIG. 7 is a cross-sectional view of an essential part showing still another configuration of the above-mentioned inverted body.

8 (a) to (c) are cross-sectional views for explaining the operation when the impeller blades in the same as above have different configurations.

FIG. 9 is a sectional view showing a conventional example.

FIG. 10 is a sectional view showing another conventional example.

FIG. 11 is a cross-sectional view showing another conventional example.

FIG. 12 is a sectional view showing still another conventional example.

[Explanation of symbols]

1 Pump Case 3 Inlet 5 ₁ , 5 ₂ Outlet 20 Impeller 40 Inverter 42 ₁ , 42 ₂ Blocker

[Procedure amendment]

[Submission date] July 8, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

In order to achieve the above object, the invention of claim 1 provides only one of a pair of outlets provided in the pump case for allowing fluid to flow into the pump case from the inlet. a pump case a bidirectional pump, the pair of outlet ports are juxtaposed to selectively flow out,
The pump case includes an impeller rotatably housed in the pump case, and an inversion body swingably attached between both outlets in the pump case. A pair of closing plates are provided to close each of the outlets so as to be openable and closable, and one of the outlets is closed by one of the closing plates while being inverted and oscillated according to the rotation of the impeller. A plate forms a flow path to the other outlet, and the reversing body reverses and swings according to the rotating direction of the impeller, and selectively flows out from only one of the pair of outlets. Moreover, since the closing plate of the reversing body that opens and closes the outlet opening and closing is opened and closed substantially along the axial direction of the outlet, the frictional force between the closing plate and the outlet is the same as in the conventional example. It is possible to achieve both operating performance and sealing performance without causing Shortening of the life due Worn can be prevented. Further, since the mounted inverted body between juxtaposed been outlet resistance in the reversing member channel formed by the closure plate is reduced in size, the fluid from the outlet port as compared with the prior art The flow rate can be increased.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

[0022]

According to the first aspect of the present invention, there is provided a bidirectional pump in which a fluid flowing into the pump case from the inlet is selectively discharged from only one of a pair of outlets provided in the pump case. a pair of flow outlets pump case are juxtaposed, an impeller this is housed in the pump case rotatably, and an inverting body swing is rotatably mounted between the two outlet in the pump casing The reversing body is provided with a pair of closing plates that individually close the outlets so as to be openable and closable substantially along the axial direction of the outlets, and one of the outlets is inverted and oscillated according to the rotation of the impeller. Since one of the closing plates simultaneously closes one of the closing plates, the other closing plate forms a flow path to the other outlet, so that the reversing body reverses and swings according to the rotating direction of the impeller. Selective outflow from only one of the outlets In addition, since the closing plate of the reversing body that opens and closes the outlet opening and closing substantially opens and closes along the axial direction of the outlet, a frictional force as in the conventional example is generated between the closing plate and the outlet. Therefore, it is possible to achieve both the operating performance and the sealing performance at the same time, and it is possible to prevent the life from being shortened due to wear. Further, since the mounted inverted body between juxtaposed been outlet resistance in the reversing member channel formed by the closure plate is reduced in size, the fluid from the outlet port as compared with the prior art There is an effect that the flow rate can be increased.

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

[Figure 5]

[Procedure Amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

[Procedure correction 6]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 11

Claims (4)

[Claims] 1. A bidirectional pump that selectively discharges a fluid flowing from an inlet into a pump case from only one of a pair of outlets provided in the pump case, wherein the pair of outlets are mutually A pump case with the shafts arranged side by side, an impeller rotatably housed in the pump case, and an inversion body swingably attached between both outlets in the pump case. The reversing body is provided with a pair of closing plates that individually close the outlets so as to be openable and closable substantially along the axial direction of the outlets, and one of the outlets is inverted and oscillated according to the rotation of the impeller. The bidirectional pump is characterized in that one of the closing plates is closed and at the same time, the other closing plate forms a flow path to the other outflow port. 2. The bidirectional pump according to claim 1, wherein an elastic body for sealing is provided on at least one of the periphery of the outlet and the surface of each closing plate that abuts against the periphery of each outlet. 3. A pair of closing plates provided in at least the reflector is formed of an elastic body.
Bidirectional pump described. 4. The impeller blades are curved in the direction of rotation of the impeller.
Bidirectional pump described.