JP4851236B2 - Electric feed pump - Google Patents

Description

  The present invention relates to an electric liquid supply pump used for dispensing a liquid from a plastic container, and more particularly to a pump suitably used for supplying kerosene from a plastic container to a cartridge tank such as an oil fan heater.

  The electric liquid supply pump includes a liquid suction pipe having a liquid feed impeller built in at a lower end, a discharge hose connected to a side surface near the upper end of the liquid suction pipe, and a grip fixed to the upper end of the liquid suction pipe. . The liquid absorption pipe normally includes a liquid feed impeller, an electric motor whose output shaft is directly connected to the impeller, and wiring for connecting the battery and the electric motor. Also, the grip usually doubles as a battery case. An air intake port is provided at the connection portion between the grip and the liquid suction pipe in order to stop the liquid supply from continuing due to the siphon phenomenon even after the motor is stopped.

  When using such an electric liquid supply pump, the liquid suction pipe is put in the plastic container, the discharge hose is put in the cartridge tank, and the switch attached to the outer surface of the grip is turned on. As a result, the electric motor drives the liquid phase impeller, the liquid in the plastic container is pumped up from the liquid absorption pipe, most of the liquid is discharged from the discharge hose, and part of the liquid comes out from the air intake port and the outer peripheral surface of the liquid absorption pipe Is returned to the plastic container. After the liquid supply is completed, the motor is stopped by turning off the switch or automatically turning off based on the detection signal from the liquid level sensor, and the outside air is introduced from the air intake port. As a result, the residual liquid in the liquid suction pipe returns to the plastic container by its own weight, and the residual liquid in the discharge hose falls to the cartridge tank.

By the way, the plastic container that has been widely used in recent years has a low profile for improving stability, and its opening is at a position lower than the air intake port of the conventional electric liquid supply pump. For this reason, the troublesomeness that keeps the liquid suction pipe and the opening of the plastic container in a non-contact state during the liquid supply so that the liquid falling along the outer peripheral surface of the liquid suction pipe does not flow out of the plastic container. there were. Therefore, in order to avoid this bothersomeness, a cover that covers the air intake and surrounds the upper part of the liquid suction pipe is attached, or a groove connected to the air intake is provided on the outer peripheral surface of the liquid suction pipe in the axial direction and returned. A technique for concentrating liquid in a groove has been proposed (Patent Document 1). For the same purpose, a fixed pump in which a stopper that fits into the opening of the plastic container is attached to the upper part of the air intake port has been proposed.
JP 2001-165084 A

However, in any case, in the conventional electric liquid supply pump, a part of the pumped liquid is returned to the plastic container from the air intake port as described above, so that battery energy is wasted correspondingly. Will be. Further, in the case of a type provided with a cover or a groove, it seems to be leaking during liquid supply, and anxiety is felt. In the case of the fixed type, a plurality of plastic containers having different heights cannot be handled.
Therefore, an object of the present invention is to provide a non-fixed electric liquid supply pump that is excellent in liquid supply efficiency and can be used with confidence.

In order to solve the problem, the electric liquid supply pump of the present invention is
Electric liquid supply comprising a liquid suction pipe having a liquid feed impeller driven by an electric motor, a discharge hose connected to a side surface near the upper end of the liquid suction pipe, and a gas passage for communicating the inside of the liquid suction pipe with the outside air In the pump,
The gas passage is provided with a valve that allows inflow from outside air into the liquid absorption pipe and prevents flow in the opposite direction.
According to this configuration, during supply of the liquid, the valve is closed because the air pressure in the liquid suction pipe is maintained equal to or higher than the outside air as the liquid is pumped. Accordingly, almost all of the pumped liquid is discharged from the discharge hose. On the other hand, when the liquid supply is finished and the energization to the electric motor is stopped, the liquid in the liquid suction pipe and the discharge hose tends to fall by their own weight. For this reason, the atmospheric pressure in the liquid suction pipe drops instantaneously, but immediately the valve opens to take in outside air. Therefore, the siphon phenomenon does not occur. The gas passage may be formed integrally with the liquid absorption pipe or may be formed separately. When the grip is fixed on the liquid supply pipe, the gas passage may be formed integrally or separately in the grip.

The gas passage has a direction changing portion that exits the liquid suction pipe and is horizontal or upward, and then descends, and the valve is provided in the descending path . Since the electric liquid supply pump is normally used with a liquid absorption pipe standing up, according to this configuration, the pressure in the liquid absorption pipe and the weight of the valve body during liquid supply can be obtained even without a holding member such as a valve spring. Because it can be closed and the structure is simple. Therefore, for example, the valve may be composed of a valve seat whose diameter decreases downward and a spherical valve body placed on the valve seat.
The connecting portion of the gas passage with the liquid suction pipe is preferably formed at an eccentric position opposite to the discharge hose with respect to the axis of the liquid suction pipe. This is because it is possible to minimize the situation in which the liquid flows excessively into the gas passage during the liquid supply.

Furthermore, the liquid absorption pipe and the discharge hose may be directly connected, or may be indirectly connected via a bifurcated connection pipe or the like. The gas passage when the connecting pipe is provided includes a cylindrical socket formed so as to protrude from the upper end of the connecting pipe , and the valve fitted to the socket. This is because the valve can be formed separately from the liquid suction pipe, the discharge pipe, etc., and can be attached and detached. In this case, the valve is usually composed of a resin valve chamber and a spherical metal valve body. And, particularly preferably, a joint in which the valve chamber is fitted to the socket, a cylindrical valve chamber main body that leads to the joint through a small hole, a valve seat that is formed on the lower surface of the valve chamber main body and decreases in diameter toward the lower side, And a lid that is connected to the valve chamber main body by a belt-like hinge and closes the upper surface of the valve chamber main body.

  Since the liquid does not flow out from the gas passage during the liquid supply, the liquid supply efficiency is excellent, and the liquid does not flow down along the outer peripheral surface of the liquid suction pipe, so that the liquid can be supplied with peace of mind.

Embodiment 1
Hereinafter, the present invention will be specifically described based on embodiments. Fig.1 (a) is a partially broken front view which shows the electric liquid supply pump (henceforth "a pump") of this invention.
The pump 1 includes a cylindrical liquid suction pipe 2 made of hard plastic, a flexible discharge hose 3, and a grip 4. A liquid feeding impeller 5 and an electric motor 6 having an output shaft directly connected to the impeller 5 for driving the liquid feeding impeller 5 are built in the lower end of the liquid suction pipe 2. The discharge hose 3 is connected to the side surface in the vicinity of the upper end of the liquid suction pipe 2 and is formed intermittently or entirely bellows in the length direction so as to have the flexibility. A liquid level sensor may be attached to the tip of the discharge hose 3. The grip 4 is for an operator to hold the pump 1 when the pump 1 is used to maintain the posture of the pump 1, but the upper part also serves as a battery case. The battery 7 in the grip 4 is electrically connected to the electric motor 6 via a wiring not shown in the liquid absorption pipe 2.

  The lower part of the grip 4 also serves as a joint for connecting the liquid suction pipe 2 and the discharge hose 3 at the upper end of each other. The discharge hose 3 is connected to the upper end of the liquid suction pipe 2 via the grip 4 or by the grip 4. It is connected to the nearby side. A vent hole 21 is formed on the side surface of the liquid suction pipe 2 at a position opposite to the connection position of the discharge hose 3 as shown in FIG. The diameter of the vent hole 21 is sufficiently smaller than that of the discharge hose 3, for example, about ¼, and the center thereof is higher than that of the discharge hose 3.

  On the other hand, the lower part of the grip 4 surrounds the liquid suction pipe 2 to an appropriate height below the vent hole 21, and a notch 41 is formed on the inner peripheral surface of the lower end portion at substantially the same circumferential position as the vent hole 21. The others are in close contact with the outer peripheral surface of the liquid suction pipe 2. A space surrounded by the inner peripheral surface of the grip 4 and the outer peripheral surface of the liquid suction pipe 2 is a gas passage that starts at the notch 41 and ends at the vent hole 21. Between the vent hole 21 and the notch 41, a valve seat 81 having a reverse octagonal shape or a truncated cone shape whose diameter decreases downward and a spherical valve body placed on the valve seat 81. A valve 8 consisting of 82 is provided. The valve body 82 is made of a material having a large specific gravity such as metal. The valve 8 is closed by the weight of the valve body 82 when the pump 1 is in the standing posture. Therefore, the passage of the gas entering from the notch 41 is allowed, but the flow in the opposite direction is blocked unless an impact is applied.

  When the pump 1 is used to dispense kerosene from a plastic container to a cartridge tank, for example, the liquid suction pipe 2 is inserted into the plastic container and the discharge hose 3 is inserted into the cartridge tank, and a switch (not shown) is turned on. As a result, the electric motor 6 drives the liquid feed impeller 5, and the kerosene in the plastic container is pumped up from the liquid suction pipe 2 and discharged from the discharge hose 3 as indicated by the arrow in FIG. The air in the liquid suction pipe 2 is discharged from the discharge hose 3 prior to kerosene at the beginning of liquid supply, and partly presses the valve body 82 against the valve seat 81 through the vent hole 21. For this reason, during refueling, the pressure in the gas passage above the valve 8 is kept equal to or higher than the outside air. Therefore, the fact that the vent hole 21 is sufficiently small also acts so that kerosene rarely passes through the vent hole 21 and is stopped by the valve 8 even if it passes.

  When the refueling is finished and the energization to the electric motor 6 is stopped, the liquid in the liquid suction pipe 2 and the discharge hose 3 tends to fall by their own weights as indicated by arrows in FIG. For this reason, the atmospheric pressure in the liquid suction pipe 2 instantaneously decreases. However, as shown in FIG. 2 (b) as an enlarged view of the B part in FIG. Open and take in outside air. Therefore, even if the liquid level in the plastic container is higher than the liquid level in the cartridge tank, the siphon phenomenon does not occur, and refueling stops when the remaining liquid in the discharge hose 3 is discharged.

Embodiment 2
This embodiment is an example in which the valve is detachable from the pump. FIG. 3 is a longitudinal sectional view showing a main part of the electric liquid supply pump according to this embodiment, FIG. 4 shows a valve chamber attached to the pump, (a) is a perspective view, and (b) is from another direction. FIG. 5 shows the same valve chamber, (a) is a plan view, (b) is a front view, (c) is a bottom view, (d) is a left side view, and (e) is a right side view. It is.
The electric liquid supply pump includes a hard plastic connecting pipe 11 and a valve 18. The connecting pipe 11 includes a battery housing part 14, a liquid absorption pipe socket 12, and a discharge hose socket 13. The socket 12 and the socket 13 are in communication with each other so as to form an inverted L shape, and the upper end of an unillustrated suction pipe and the upper end of a discharge hose are connected to the socket 12 and the socket 13 in a liquid-tight manner, respectively. Yes. The battery housing portion 14 has a cylindrical shape and is integrally formed on the upper end of the socket 12, that is, on the outer peripheral surface of the socket 13. A cylindrical valve socket 15 is formed in the battery housing portion 14 so as to protrude upward. The socket 15 communicates with the socket 12 and the socket 13 through a small hole.

  The valve 18 includes a resin valve chamber 19 and a spherical metal valve body 10 which are molded separately from the connecting pipe 11. The valve chamber 19 is formed on a lower surface of a joint 19a that is airtightly fitted to the inner peripheral surface of the socket 15, a cylindrical valve chamber main body 19c that communicates with the joint 19a through a small hole 19b, and a lower surface of the valve chamber main body 19c. The valve seat 19d has a diameter that decreases toward the surface, and a lid 19f that is connected to the valve chamber body 19c by a belt-like hinge 19e and closes the upper surface of the valve chamber body 19c. The valve chamber 19 is symmetrical with respect to a straight line passing through the center of the joint 19a and the center of the valve seat 19d in plan view. The valve 18 is attached to the connecting pipe 11 by pressing the joint 19a into the socket 15 with the lid 19f opened, placing the valve body 10 on the valve seat 19d, and then closing the lid 19f. On the inner peripheral surface of the valve chamber main body 19c, stoppers 19g and 19h projecting radially from the positions on both sides with the symmetry axis in between are formed to prevent the lid 19f from sinking too much.

  When the pump of this embodiment is used, the liquid is pumped up from the liquid suction pipe and discharged from the discharge hose as in the first embodiment (arrow in FIG. 3). When the liquid supply is finished and the energization to the electric motor is stopped, the liquid in the liquid absorption pipe, the discharge hose and the connection pipe 11 branches in the connection pipe 11 as indicated by the arrows in FIG. And Therefore, although the atmospheric pressure in the connecting pipe 11 decreases instantaneously, as shown in FIG. 6, the valve body 10 immediately floats slightly to open the valve 18 and take in outside air. Therefore, even if the liquid level of the transfer destination is higher than the liquid level of the transfer source, the siphon phenomenon does not occur, and refueling stops when the remaining liquid in the discharge hose is discharged.

The electric liquid supply pump of Embodiment 1 is shown, (a) is a partially broken front view, (b) is the B section enlarged view of (a). FIG. 2A is a partially cutaway front view and FIG. 2B is an enlarged view of a portion B of FIG. It is a longitudinal cross-sectional view which shows the principal part of the electric liquid supply pump which concerns on Embodiment 2. FIG. The valve with which the said pump is mounted | worn is shown, (a) is a perspective view, (b) is the perspective view seen from another direction. The valve is shown, (a) is a plan view, (b) is a front view, (c) is a bottom view, (d) is a left side view, and (e) is a right side view. It is a longitudinal cross-sectional view which shows the principal part immediately after liquid supply end of the said electric liquid supply pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric supply pump 2 Liquid absorption pipe 3 Discharge hose 4 Grip 5 Liquid feed impeller 6 Electric motor 7 Battery 8, 18 Valve

Claims (4)

Electric liquid supply comprising a liquid suction pipe having a liquid feed impeller driven by an electric motor, a discharge hose connected to a side surface near the upper end of the liquid suction pipe, and a gas passage for communicating the inside of the liquid suction pipe with the outside air In the pump,
The gas passage has a direction changing section that exits the suction pipe, is horizontal or upwards, and subsequently descends, and allows the inflow from outside air into the suction pipe in the descending path, and flows in the opposite direction. An electric liquid supply pump, characterized in that a valve for preventing this is provided.   The pump according to claim 1, wherein the valve includes a valve seat having a diameter that decreases downward, and a spherical valve body that is placed on the valve seat. A liquid suction pipe with a built-in liquid feed impeller driven by an electric motor, a discharge hose connected to the side surface near the upper end of the liquid suction pipe, a gas passage for communicating the inside and outside of the liquid suction pipe, the liquid suction pipe and the discharge In the electric liquid supply pump provided with a connecting pipe for connecting the hose ,
The gas passage includes a cylindrical socket formed so as to protrude upward from the connecting pipe, and a valve fitted to the socket, and the valve allows inflow from outside air into the liquid absorption pipe and vice versa. An electric liquid supply pump characterized in that it prevents flow in the direction.   The valve comprises a resin valve chamber and a spherical metal valve body. The valve chamber is a joint that fits into the socket, a cylindrical valve chamber body that communicates with the joint through a small hole, and a lower surface of the valve chamber body. The pump according to claim 3, comprising: a valve seat that is formed at a lower portion and has a diameter that decreases downward, and a lid that is connected to the valve chamber body by a belt-like hinge and closes the upper surface of the valve chamber body.

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