JPH059972Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a washing pump for automobiles, and more specifically, it selectively supplies washing liquid to the front and rear windows of an automobile from a common tank. This relates to selective delivery pumps such as:

(Prior Art) A conventional selective delivery pump is disclosed in Japanese Patent Application Laid-Open No. 60-6096, and in FIGS. A manhold chamber 2 is rotatably housed in the manhold chamber 2 and is partitioned into two upper and lower chambers by an elastic membrane 18.
0,22 are communicated into housing 16 by respective tangential conduits 24,26. Discharge ports 28 and 30 are opened in each manfold chamber 20 and 22 at positions facing the elastic membrane 18, respectively.

With this configuration, when the impeller 14 rotates, liquid entering the housing 16 through the axial inlet 32 passes through the tangential conduits 24, 26,
The air flows into each manfold chamber 20, 22. At this time, the tangential conduit side of the impeller 14 rotation direction is
The pressure in the reverse direction becomes higher than that in the tangential conduit, and the difference between the two pressures causes the elastic membrane 18 to move, closing the discharge port 28 and causing the liquid to be discharged from the discharge port 30.

When the rotation direction of the impeller is reversed, the pressure difference acting on the elastic membrane 18 is reversed, and as a result, the discharge port 30
is closed and liquid is sent out from the discharge port 28.

(Problem to be Solved by the Invention) However, in the selective delivery pump, both the tangential conduits 24 and 26 have positive pressure with respect to the suction port 32, and the pressure generated in both the tangential conduits 24 and 26 Since a sufficient difference cannot be obtained, especially when switching the delivery direction, the switching action of the elastic membrane 18 becomes slow due to the residual pressure of the liquid remaining in the manfold chamber that was on the delivery side until just before the switching, and the switching action of the elastic membrane 18 becomes slow, causing the switching operation that was originally blocked. There is a problem in that the liquid is also sent to the discharge port side where it should be.

(Means for solving the problems) This invention has the following configuration to solve the above problems.

That is, in an axial flow pump driven by a reversible motor, two truncation-direction conduits led out from the pump chamber are communicated with opposing valve chambers via a partition chamber, and discharge is discharged into each valve chamber. An outlet is provided, and a valve stem is provided that is movably inserted through the partition wall and has both ends protruding into the partition chamber, and the discharge port of one valve chamber is opened at both ends of the valve stem when the valve stem moves. In this case, a valve body for closing the discharge port of the other valve chamber is fixedly installed, and a return conduit from the partition chamber is communicated with an axial suction port of the axial flow pump.

(Example) This will be explained in detail based on the drawings.

In FIGS. 1 to 5, 30 is a small electric motor capable of forward and reverse rotation, and an impeller 40 of an axial flow pump is fixed to the output shaft 32 of the motor 30.
The impeller 40 is rotatably installed within the pump chamber 42 . 44 is an axial suction port through which liquid flows into the pump chamber 42. 46 and 48 are tangential conduits located axially symmetrically to the pump chamber 42.

Next, 50 and 52 are valve chambers, respectively, which are arranged via a partition chamber 54 and communicate with the pump chamber 42 by means of tangential conduits 46 and 48. 55 and 56 are discharge ports provided in the valve chambers 50 and 52, and 58 and 60 are water ports that communicate the valve chamber 50 and the partition chamber 54, and the partition chamber 54 and the valve chamber 52.

Next, 62 is a valve body located in the valve chamber 50 to open and close the discharge port 55 and the water passage port 58. 64 is also a valve body, located within the valve chamber 52, and opens and closes the discharge port 56 and the water passage port 60. Both valve bodies 62 and 64 are fixed to both ends of a valve rod 60 that is slidably supported within the partition chamber 54 and the water inlets 58 and 60. valve stem 66
By moving, when one valve element opens the outlet and closes the water outlet, the other valve element opens the outlet and closes the outlet.

A return conduit 68 communicates the partition chamber 54 with the axial suction port 44 .

Next, the operation of the present invention will be explained.

When the impeller 40 is stationary, the valve bodies 62 and 64 are in a free state. (Fig. 1) In this state, the impeller 4
0 rotates counterclockwise (FIG. 2), liquid passes from the axial inlet 44 through the tangential conduit 48;
It flows into the valve chamber 52. Correspondingly, the valve chamber 52
The other valve chamber 50 has a positive pressure gradient and the valve body 64 is moved in the direction of arrow C. The valve body 64 then opens the discharge port 56 and closes the water passage port 60. The valve body 62 closes the discharge port 55 and opens the water inlet 46. As a result, the liquid is delivered from the discharge port 56 to, for example, a front window (not shown).By switching the polarity of the power supply to the motor 30, the impeller 4
0 in the clockwise direction (Fig. 3), the valve bodies 62 and 64 move in the opposite direction (to the right) as described above, and the discharge port 55 is opened and the liquid flows through the discharge port. 55 to, for example, a rear window (not shown).

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

Note that by providing the return conduit 68, the liquid in the partition chamber 54 is returned to the axial suction port 44, so that the inside of the partition chamber 54 has a negative pressure gradient with respect to both valve chambers 50, 52, and the liquid in the partition chamber 54 is particularly The value is large for the side valve chamber. When the rotation of the impeller 40 is switched from counterclockwise to clockwise (FIG. 4), the liquid in the valve chamber 52, which had been under high pressure on the discharge side until just before, is transferred to the valve body 54.
As the water moves slightly to the right, the water inlet 66 opens and the water flows into the partition chamber 54. Therefore, the pressure in the valve chamber 52 rapidly decreases, so that the valve bodies 62, 6
4 can quickly move to the right in response to the pressure gradient in both valve chambers 50, 52.

(Results of the invention) As described above, according to the selective delivery pump according to this invention, the installation of the bulkhead chamber is replaced by the installation of a return conduit that communicates the bulkhead chamber and the suction port, and the residual pressure is used when switching the delivery direction. This has the effect that the movement of the valve body is not hindered, the switching operation is quick, and the liquid can be accurately delivered without being erroneously delivered to the discharge port that should be blocked.

[Brief explanation of drawings]

Figures 1 to 5 show the present invention.
The figure is a cross-sectional view showing the principle of the pump, Figure 2 is a cross-sectional view showing the operating state when the impeller rotates counterclockwise, Figure 3 is a cross-sectional view showing the operating state when the impeller rotates clockwise, and Figure 4 is a cross-sectional view showing the operating state when the impeller rotates counterclockwise.
The figure is a cross-sectional view showing the operating state when the impeller is switched from counterclockwise to clockwise, and FIG. 5 is a cross-sectional view of the pump. FIG. 6 is a cross-sectional view of a conventional pump, and FIG. 7 is a cross-sectional view taken along the - line. 30... Motor, 40... Impeller, 42... Pump chamber, 44... Suction port, 46, 48... Tangential conduit, 50, 52... Valve chamber, 54... Bulkhead chamber,
55, 56...Discharge port, 58,60...Water port,
62, 64... Valve body, 66... Valve stem, 68... Return conduit.

Claims (1)

[Scope of utility model registration request] Two tangential conduits led out from the pump chamber of an axial flow pump driven by a motor capable of forward and reverse rotation are communicated with opposing valve chambers via a partition chamber, and discharge is discharged into each valve chamber. An outlet is provided, a valve stem is provided that is movably inserted through the partition wall and has both ends protruding into the partition chamber, and the discharge port of one valve chamber is opened at both ends of the valve stem when the valve stem moves. A selective delivery pump characterized in that a valve body is fixedly installed to close the discharge port of the other valve chamber, and a return conduit from the partition chamber is communicated with an axial suction port.