JPH05560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a selective delivery pump, and more particularly, to a selective delivery pump for selectively supplying washer fluid to the front window and rear window of an automobile. , relates to a selective delivery pump that selectively supplies liquid to two systems from one tank.

(Prior Art) When supplying washer fluid to the front and rear windows of an automobile, generally a washer fluid tank and a delivery pump are provided separately for each window. However, if each cleaning device is provided separately in this way, the space occupied by each cleaning device becomes large and the cost also increases.

In order to solve these problems, there is a system that selectively delivers washer fluid from a common washer fluid to two different cleaning systems using one selective delivery pump.

FIG. 14 is an axial cross-sectional view of the conventional selective delivery pump, and FIG. 15 is a cross-sectional view taken along the line -- in FIG. 14 (Japanese Patent Laid-Open No. 60-6096).

The pump 10 has a centrifugal impeller 14 fixed to the output shaft of a forward/reverse motor 12, and a manifold chamber partitioned into two upper and lower chambers by an elastic membrane 18 on the side of a housing 16 that houses the impeller 14. 20,2
2 is formed. The upper and lower manifold chambers 20, 22 are then communicated into the housing 16 by two symmetrically located tangential conduits 24, 26 from the housing 16, respectively. Further, discharge holes 28 and 30 are opened in the manifold chambers 20 and 22 at positions facing the elastic membrane 18, respectively, and the opening edges of the discharge holes 28 and 30 are formed in the valve seat.

With this configuration, the impeller 14 is the first
When rotated counterclockwise in FIG. 5, liquid flowing into the housing 16 through the axial bore 32 flows into each manifold chamber 20, 22 through both tangential conduits 24, 26. At this time, the pressure on the side of the tangential conduit 24 facing the rotation direction of the impeller 14 is higher than that on the side of the tangential conduit 26 extending in the opposite direction to the rotation direction of the impeller 14, and the pressure difference between the two causes elasticity. The membrane 18 is brought into close contact with the valve seat to open the discharge hole 30.
is closed, while the discharge hole 28 is opened and liquid is sent out from the discharge hole 28.

When the impeller 14 is rotated clockwise, the discharge hole 28 is now closed by the elastic membrane 18, while the discharge hole 30 is opened, and the liquid is sent out from the discharge hole 30.

In this way, liquid is selectively delivered to two channels.

(Problems to be Solved by the Invention) However, the above selective transmission pump 10 also has the following problems.

That is, both tangential conduits 24, 26 mentioned above
is for the suction side (axial hole 32) of the pump,
Although the angles are different, both are on the discharge side. Therefore, when the impeller 14 rotates, regardless of the direction of rotation of the impeller 14, positive pressure is created in both the tangential conduits 24 and 26 relative to the suction side. Just impeller 1
4, both tangential conduits 24, 26
There is a difference in the pressure within the valve seat, and this pressure difference is used to simply bring the elastic membrane 18 into close contact with one of the valve seats.

In this way, since the insides of both the tangential conduits 24 and 26 are both positive pressure, foreign matter or the like may be present, causing the elastic membrane 18 to
If the sealing of the valve seat, which should be sealed by the valve seat, becomes incomplete, there is a problem in that, although the discharge pressure is low, liquid may also be sent to the side of the discharge hole that should originally be blocked. In addition, when the pump starts up, when the power supply voltage drops, or when the flow resistance between the pump and the jet nozzle is large, a sufficient pressure difference can be created to make the elastic membrane completely adhere to the valve seat. Even if it is difficult, the seal may be incomplete and there is a problem that liquid may leak toward the discharge hole that should be blocked.

Therefore, the present invention has been made to solve the above problems, and its purpose is to provide a selective delivery system that can completely prevent liquid leakage toward the discharge hole that should be blocked, and that can be easily assembled. There is a pump to provide.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes the following configuration.

That is, a housing, an impeller that is rotatably housed within the housing, has a large number of blades on its peripheral wall, and forms a working passage for pumping liquid between the inner wall of the housing and the outer periphery of the blades;
A forward/reverse motor that connects the impeller to an output shaft and rotates the impeller in forward and reverse directions; and a forward/reverse motor that connects the impeller to an output shaft and rotates the impeller in forward and reverse directions; a liquid introduction passage connected to an external liquid tank and extending within a partition wall partitioning the two valve chambers; and a suction opening in the partition wall to communicate the liquid introduction passage with both valve chambers. a discharge port provided on the inner wall of both the valve chambers at a position facing each of the suction ports, and a discharge port that is slidably inserted through the partition wall so that both ends thereof can protrude into each of the valve chambers. comprising a valve stem, fixed to both ends of the valve stem, and when the valve stem moves, the inlet of one valve chamber is opened and the outlet of the other valve chamber is closed, the inlet of the other valve chamber is closed; a valve body having a valve portion that opens a discharge port, the impeller and the valve body are disposed in a component storage portion of a pump body in which a component storage portion is recessed, and the component storage portion is covered. and fit the cap to the pump body.
By fixing, the housing, the working passage, and the two valve chambers are formed between the pump body and the cap, and the end face of the partition wall provided on the inner bottom surface of the member storage portion A concave groove provided in at least one of the end face of the partition wall and the inner surface of the cap that faces the end face of the partition wall forms a space that opens into the two valve chambers as the suction port and guides the valve stem of the valve body. shall be.

(effect) Next, the effect will be explained.

As shown in FIG. 2, when the impeller 40 is rotated counterclockwise, the pressure in the valve chamber 46 becomes negative, while the pressure in the valve chamber 47 becomes positive. As a result, the valve part 5
4 and 55 move to the left in FIG.
4 opens the suction port 50 and closes the discharge port 52, and the valve portion 55 closes the suction port 51 and opens the discharge port 53.
Therefore, the liquid flows through the liquid introduction path 49, the suction port 50,
It flows into the valve chamber 46, the working passage 44, and the valve chamber 47, and is delivered to the required location from the discharge port 53. Impeller 40
When the liquid is rotated in the direction of rotation of the hour hand as shown in FIG. 3, the liquid is sent out from the discharge port 52 to the other required location.

In the present invention, since the liquid introduction passage 49, one valve chamber, the working passage 44, and the other valve chamber are connected in series in this order, one valve chamber always has a negative pressure with respect to the liquid introduction passage 49, and the other valve chamber always has a negative pressure. The valve chamber of the valve chamber always has a positive pressure, and the liquid is not erroneously delivered to the discharge port opening into the valve chamber on the side where the pressure is negative, and the liquid can be accurately selected and delivered to the required location.

To assemble the pump, place the impeller 40 and the valve body 59 in the component storage section 64 of the pump body 61,
This can be easily done by fitting and fixing the cap 62 to the pump body 61 while covering the member storage portion 64.

(Example) Hereinafter, preferred embodiments embodying the present invention will be described in detail based on the accompanying drawings.

First, the basic principle of the apparatus of the present invention will be explained with reference to FIGS. 1 to 3.

In FIG. 1, 40 is a disk-shaped impeller with a large number of grooves 41 formed on its circumferential surface, and a housing 4
2 so as to be rotatable around a shaft 43. A working passage 44 is formed between the circumferential side of the impeller 40 and the inner wall of the housing 42, which exhibits a pumping action when the impeller 40 rotates.

It is preferable that the working passage 44 is set so as to cover about 80% of the circumference of the impeller (about 50% is shown in FIG. 1).

Next, 46 is a valve chamber communicating with one end side of the working passage 44. Further, 47 is a valve chamber, which communicates with the other end of the working passage 44 . Both valve chambers 46, 4
7 are located adjacent to each other and partitioned by a partition wall 48. Further, a liquid introduction passage 49 is formed in the partition wall 48 , and the liquid introduction passage 49 communicates with the valve chamber 46 through an inlet 50 and also with the valve chamber 47 through an inlet 51 . . The liquid introduction path 49 is connected to the liquid tank by a suitable connecting pipe (not shown).

Reference numeral 52 denotes a discharge port, which opens in the wall surface of the valve chamber 46 facing the suction port 50 . Further, 53 is also a discharge port, which opens in the wall surface of the valve chamber 47 facing the suction port 51 . Note that the opening area of both discharge ports 52 and 53 is the same as that of liquid introduction path 49 and both suction ports 50 and 5.
It is set smaller than the opening area of No. 1.

Next, 54 is a valve part, and the inlet 5 of the valve chamber 46
0 and the discharge port 52 are opened and closed. 55 is also a valve portion, which opens and closes the suction port 51 and the discharge port 53 of the valve chamber 47. Both valve portions 54 and 55 are fixed to both ends of a valve rod 56 that is slidably supported within the liquid introduction path 49 and both suction ports 50 and 51 by appropriate members. Valve part 5
4, 55 and the valve stem 56 constitute a valve body 59. When the valve stem 56 moves so that one valve part closes the inlet of the valve chamber and opens the discharge port, the other valve part opens the inlet of the valve chamber and discharges. It is set in such a way that it blocks the exit.

Next, the operation of the above embodiment will be explained.

When the impeller 40 is stationary, the positions of the valve bodies 54 and 55 are not determined and are in a free state (FIG. 1).

When the impeller 40 rotates in the direction of arrow A (FIG. 2) in this state, the pressure in the valve chamber 46 becomes negative and the pressure in the valve chamber 47 becomes positive. Therefore, when the impeller 40 begins to rotate, the liquid flows from the suction port 50 into the valve chamber 4 under negative pressure.
In the valve chamber 47, the liquid also flows to the rear side of the valve portion 55 (discharge port 53 side). As a result, substantially the same liquid pressure acts on both sides of the valve part 55, and on the other hand, as the impeller 40 continues to rotate, substantially the same liquid pressure acts on both sides of the valve part 54.
Since negative pressure is applied to the 2 side and positive pressure is applied to the suction port 50 side, a pressing force acts on both valve parts 54 and 55 as a whole in the direction of arrow C, and the valve parts 54 and 55 are moved. The valve portion 54 completely opens the suction port 50 and closes the discharge port 52, and the valve portion 55 closes the suction port 51 and completely opens the discharge port 53 (FIG. 2). Therefore, the liquid is supplied to the required location from the discharge port 53 by the pump action in the working passage 44 through a pipe or the like (not shown).

Note that the above operation is performed instantaneously, and during this time some liquid 6 may flow from the discharge port 52 into the valve chamber 46, which is under negative pressure, but the liquid is not sent to the discharge port 52 side as in the conventional case. It can't happen. Therefore, even if the sealing of the discharge port 52 by the valve portion 54 is somewhat incomplete, the liquid will still flow through the discharge port 5.
It will no longer be sent to the 2nd side. Also, the valve part 55
Even if the seal of the inlet 51 is incomplete,
There is no major inconvenience as long as the amount of liquid sent to the discharge port 53 is slightly reduced.

FIG. 3 shows a state in which the impeller 40 is rotated in the opposite direction to that in FIG. In this case, the valve portions 54 and 55 move in the opposite direction to the above, acting in the same manner as described above.
The suction port 51 and the discharge port 52 are opened, and the liquid is sent to another required location from the discharge port 52 through an appropriate pipe or the like.

FIG. 4 shows another embodiment.

In this embodiment, check valves 5 are provided at both discharge ports 52 and 53 to prevent backflow of liquid to both valve portions 46 and 47.
7 and 58, respectively, are the same as the above embodiment.

By providing the check valves 57 and 58 in this manner, it is possible to prevent the liquid from flowing back from the discharge port to the valve chamber when the impeller 40 starts rotating as described above.
Furthermore, since this backflow can be prevented, the liquid can be instantly delivered to a desired location when the rotation direction of the impeller 40 is changed. This is because if a space is created in the pipe on the discharge direction side due to the reverse flow, the delivery will be delayed accordingly.

FIGS. 5 to 12 show more specific embodiments. The same members as in the previous embodiment are designated by the same reference numerals.

In this embodiment, the entire casing is basically formed by a pump body 61 and a cap 62 in order to facilitate assembly of the device. Pump body 6
1 and the cap 62 are each integrally formed of synthetic resin or the like.

As is clear from FIGS. 5 and 6, the pump main body 61 has a member storage section 6 surrounded by a peripheral wall 63.
It has 4. The impeller 40 and the valve body 59 are incorporated into the member storage portion 64 during assembly of the device.

A through hole 65 into which the boss of the impeller 40 fits is provided at the inner bottom of the member storage portion 64. Further, a position close to the inner wall surface of the member storage portion 64 becomes a substantially U-shaped working passage 44 (a passage exhibiting a pumping action) as shown in FIG. Both ends of the working passage 44 become valve chambers 46 and 47 separated by a partition wall 48.

The partition wall 48 stands up from the inner bottom of the member storage section 64,
The wall surface facing the impeller forms an arcuate surface on which the blades of the impeller 40 slide. A groove 66 having a semicircular cross section is formed in the end face of the partition wall 48, and a liquid introduction path 49 opens at the center of the groove 66. The liquid introduction path 49 extends toward the back side of the component storage portion 64, and its end is open as a connection port 68 to an external liquid tank 67 (FIG. 12). An air vent hole 69 that communicates the inside of the housing 42 and the liquid introduction path 49 is provided in the part of the member storage section 64 where the impeller 40 is stored, that is, on the inner bottom surface of the housing 42 .

In addition, the pump main body 61 has a forward/reverse motor 45 (first
A fitting tube 71 is provided to fit and connect a motor housing 70 that accommodates the motor housing 70 (see FIG. 2). The output shaft 72 of the forward/reverse motor 45 passes through the through hole 73 in the outer wall of the liquid introduction path 49 and enters the pump body 61, and its tip fits into the boss of the impeller 40.

Reference numeral 74 denotes a packing housing cylinder, which houses a packing 75 and seals the through hole 73 and the output shaft 72 in a liquid-tight manner.

The valve body 59 (FIGS. 9 and 10) is entirely formed of a rubber-like elastic body, and the valve stem 56 is provided in a cross-shaped cross section. When assembling the device, half of the valve stem 56 is inserted into the groove 66 of the partition wall 48.

Note that a groove 77 into which a packing 76 (FIG. 12) is inserted is formed in the end surface of the peripheral wall 63. Further, a notch 78 is formed in a part of the inner surface of the peripheral wall 63 for positioning the cap 62 when fitting the cap 62 into the pump body 61.

The cap 62 is fitted and fixed into the peripheral wall 63 so as to close the member storage section 64, as shown in FIG.

A two-step stepped portion 7 is provided at the peripheral edge of the inner surface of the cap 62.
9 and 80 are formed, and these stepped portions 79 and 80 abut against stepped portions provided on the peripheral wall end faces of the opposing pump body 61.

On the inner surface of the cap 62, there is a bulge 8 that forms one wall surface of the housing 42 that accommodates the impeller 40 when the cap 62 is combined with the pump body 61.
1 is formed. Further, on the inner surface of the cap 62 corresponding to the aforementioned partition wall 48 of the pump body 61, a groove 8 having a semicircular cross section corresponding to the groove 66 of the partition wall 48 is provided.
2 is formed.

Further, the above-mentioned peripheral wall 63 is provided on the outer wall surface of the bulging portion 81.
A protrusion 83 is provided to fit into a notch 78 formed on the inner surface.

With this configuration, to assemble the device, first attach the forward/reverse motor 45 to the pump body 61.
The motor housing 70 incorporating the is fitted and fixed. Both can be fixed using an adhesive or by ultrasonic welding.

Next, the impeller 40 is fixed to the tip of the output shaft 72 of the motor that protrudes into the member storage portion 64 of the pump body 61. Further, the valve stem 56 of the valve body 59 is positioned in the groove 66 of the partition wall 48 (FIG. 11). Also, the surrounding wall 63
Fit the gasket 76 into the concave groove 77.

Next, the cap 62 is positioned so that the protrusion 83 fits into the notch 78, and is assembled to the pump body 61 so as to cover the member storage portion 64. The cap 62 and the pump body 61 can be fixed using a suitable adhesive or by ultrasonic welding.

By assembling the cap 62 to the pump body 61, the housing 42 that houses the impeller 40 is completed, and the valve stem 56 of the valve body 59 is attached to the partition wall 48.
The groove 66 of the cap 62 and the groove 82 of the cap 62 are movably positioned in the hollow formed by the combination. Moreover, the liquid introduction path 49 is formed by the hollow part.
The valve chambers 46 and 47 communicate with each other.

Note that the grooves provided on the end face of the partition wall 48 and the inner surface of the cap 62 may be provided on either the partition wall side or the cap side, or may be formed in the hollow portion through which the valve stem is moved.

In this embodiment, the casing is substantially composed of a pump body 61 and a cap 62, and the impeller 40 and the valve body 59 are housed in a member storage part 64, and the cap 62 is fitted into the pump body 61 to fix both. It is extremely easy to assemble. Furthermore, since the number of parts is small, costs can be reduced.

Since the overall structure and principle are the same as those of the previous embodiment, a detailed explanation will be omitted.

In this embodiment, an air vent hole 69 is provided that communicates the housing 42 and the liquid introduction path 49.

Therefore, as is clear from FIG. 12, the air in the housing 42 is pushed by the liquid introduced into the housing 42, and by the buoyancy of the air itself, so that the air flows through the air vent hole 60 and the liquid introduction path. 49, is released into the atmosphere from the external liquid tank 67.

Note that by providing the air vent hole 69 in the pump action path, it is naturally possible that the pump function will be degraded. However, when we experimented, we found that, as seen in the graph showing the relationship between pump pressure and flow rate in Figure 13, the maximum pressure decreased compared to the case without air vent holes, but on the low pressure side, air vent holes Since the air vent hole 69 also acts as a suction port, the flow rate was increased more than in the case where the air vent hole 69 was not provided, and a practically preferable result was obtained as a washer pump.

It goes without saying that the forward/reverse motor 45 described above may be powered by electricity, hydraulic pressure, or any other drive source.

(Effects of the Invention) As described above, according to the selective delivery pump according to the present invention, one valve chamber always has negative pressure and the other valve chamber always has positive pressure with respect to the liquid introduction path on the suction side. Therefore, even if the seal at the valve pair is incomplete due to the presence of foreign matter, the liquid will not be accidentally sent to the discharge port that should be blocked, and the liquid will be selectively delivered to the required location. , and can be sent accurately.

In addition, it is possible to adopt a simple pump structure of the circumferential flow pump type, and the valve body does not require that much precision, so it is less likely to break down and is suitable for applications such as washer fluid delivery pumps for car window washing that are operated irregularly. It can be used for.

In addition, by providing a check valve at the discharge port, it is possible to prevent the liquid from flowing back into the valve chamber, effectively preventing the liquid delivery time lag, and making the valve chamber more airtight, making the pump action more effective. I can reprimand you.

In addition, in the present invention, the impeller and the valve body are disposed within the pump body, and the cap is fitted and fixed to the pump body while covering the component storage portion, so that the entire device can be easily assembled, and the number of parts is reduced. This reduces costs and reduces costs.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the principle of the pump according to the present invention, Fig. 2 shows the operating state when the impeller of the pump rotates in the counterclockwise direction of the hour hand, and Fig. 3 shows the operating state when the impeller rotates in the direction of the hour hand. FIG. FIG. 4 is a sectional view showing another implementation example. Figures 5 to 12
The figures show a preferred embodiment of the device of the present invention, FIG. 5 is a front view of the pump body, and FIG.
7 is a front view of the cap, FIG. 8 is a sectional view taken along the - line in FIG. 7, FIG. 9 is a front view of the valve body, and FIG. 10 is a sectional view taken along the - line in FIG. 11
The figure is a plan view showing the impeller and the valve body housed in the pump body, and FIG. 12 is a sectional view showing the pump body attached to an external liquid tank. FIG. 13 is a graph showing pump pressure and liquid flow rate. FIG. 14 is a cross-sectional view of a conventional pump, and FIG. 15 is a cross-sectional view taken along the - line. 10...pump, 12...forward/reverse motor, 14...
... Impeller, 16 ... Housing, 18 ... Elastic membrane, 20, 22 ... Manifold chamber, 24, 26
...Tangential conduit, 28, 30...Discharge hole, 32
... Axial hole, 40 ... Impeller, 42 ... Casing, 43 ... Shaft, 44 ... Working passage, 45 ...
Forward/reverse motor, 46... Valve chamber, 47... Valve chamber, 48
...Partition wall, 49...Liquid introduction path, 50...Suction port, 51...Suction port, 52...Discharge port, 53...
Discharge port, 54, 55... Valve body, 56... Valve stem, 5
7, 58... Check valve, 59... Valve body, 60... External liquid tank, 61... Connection port, 62... Partition wall,
63...Air vent hole, 64...Component storage section, 65
...Through hole, 66...Concave groove, 67...External liquid tank, 68...Connection port, 69...Air vent hole, 70
... Motor housing, 71 ... Fitting cylinder, 72 ...
... Output shaft, 73 ... Through hole, 74 ... Packing storage cylinder, 75 ... Packing, 76 ... Packing, 77
... Concave groove, 78 ... Notch, 79, 80 ... Step portion, 81 ... Swelling portion, 82 ... Concave groove, 83 ... Protrusion.

Claims (1)

[Scope of Claims] 1. A housing, and a vane that is rotatably housed within the housing and has a large number of vanes on its peripheral wall, forming a working passage for pumping liquid between the inner wall of the housing and the outer periphery of the vane. a forward/reverse motor that connects the impeller to an output shaft and rotates the impeller in forward and reverse directions; and a forward/reverse motor that connects the impeller to an output shaft and rotates the impeller in forward and reverse directions; two valve chambers adjacent to each other; a liquid introduction path that connects to an external liquid tank and extends within a partition wall that partitions the two valve chambers; and a partition wall that connects the liquid introduction path to both valve chambers. an inlet opening in the valve chamber; a discharge port provided on the inner wall of both the valve chambers at a position facing each of the inlets; and a discharge port slidably inserted through the partition wall so that both ends thereof can protrude into the respective valve chambers. The valve stem is fixed to both ends of the valve stem, and when the valve stem moves, the suction port of one valve chamber is opened and the discharge port of the other valve chamber is closed. a valve body having a valve portion that closes a mouth and opens a discharge port; the impeller and the valve body are arranged in a component storage part of a pump body in which a component storage part is recessed; By fitting and fixing the cap to the pump body while covering the storage portion, the housing, the working passage, and the two valve chambers are formed between the pump body and the cap, and the member A concave groove provided in at least one of the end surface of the partition wall provided on the inner bottom surface of the storage portion and the inner surface of the cap opposite to the end surface of the partition wall opens into the two valve chambers as the suction port, and also opens into the valve body. A selective delivery pump characterized by forming a space for guiding a valve stem.