JPS621113B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reciprocating pump that is operated by compressed air without using a motor.

Conventionally, ordinary pumps have been driven by electric motors, which has been extremely dangerous in the event of electrical leakage.
Additionally, when the switching valve body is operated by air pressure, it has the disadvantage that it may not work if the air pressure is low, or a dead center may occur and the switching of the valve body may not operate smoothly. . This invention does not use electrical parts in the pump part, and is a reciprocating pump invented for the purpose of allowing workers to use the pump stably even when immersed in water, and smoothing the switching operation of the switching valve body. It's a pump.

An embodiment of this invention will be described based on the drawings.
1 and 1' are a pair of pump chambers, each of which has a first air inlet/outlet 2 and a second air inlet/outlet 2' in its upper part;
Moreover, a first water intake port 4 and a second water intake port 4' are formed on the bottom surface. First and second check valves 5 and 5' are attached to the first and second water intake ports 4 and 4', respectively.

In addition, the lower portions of both pump chambers 1 and 1' are communicated with each other through a connecting cylinder 7, and a ball valve 8 is accommodated in this connecting cylinder 7. This constitutes a valve mechanism for the pump chambers 1, 1' that alternately switches the two valve ports 9'. Furthermore, this connecting tube 7
A water spout 10 is formed in the center of the pipe.

Reference numerals 12 and 12' denote first and second pistons housed in pump chambers 1 and 1' for vertical movement, respectively, which divide each pump chamber into upper and lower chambers A, B, A', and B'. 1. A connecting rod that allows the piston rods 13, 13' connected to the upper part of the second piston to protrude to the upper part of the pump chamber, and that allows the upper parts of both piston rods 13, 13' to slide vertically about the support shaft 18 in the center as a fulcrum. They are connected by 14.

Reference numeral 20 denotes a main body of an air supply/exhaust switching mechanism attached to the upper part of both pump chambers 1, 1'.A cylinder 21 with both ends open is provided in this main body.
A first port 22, a second port 23, and a third port 24 are formed in a straight line in the axial direction at the center of the outer periphery of the second port 23 for air inflow, which is connected to a compressor (not shown). An exhaust port 25 is formed on the opposite side of the cylinder in the radial direction.

A support shaft 18, which serves as a fulcrum for the connecting rod 14, is supported on a pair of side walls 19, 19 standing up on both sides of the central portion of the main body 20, with the cylinder 21 straddling the cylinder 21 in the radial direction. The spring stopper 2 is formed by integrally or separately forming projecting pieces 15, 15 on both sides of the center lower part of the spring stopper 14, and engaging a fork-shaped bifurcated engaging part with a shaft 16 that is rotatably supported by the projecting pieces 15, 15.
8 is attached.

Reference numeral 30 denotes a cylindrical switching valve body that is slidably accommodated in the cylinder 21, and in the upper side of the valve body 30 in FIG. The first recess 31 communicates both the first port 22 and the second port 23, which serves as an inlet for air supplied from the compressor, and the first port 22 is always in an insulated state.
slides in the opposite direction (to the left in Figure 2), the second recess 32 connects the third port 24, which serves as an air discharge inlet that communicates with the upper chamber A' of the pump chamber 1', with the second port 23. Form in a straight line. On the other hand, the second
On the lower side of the figure is a third recess 33 that communicates the third port 24 with the exhaust port 25 when in the state shown in the figure.
In this state, a fourth recess 34 is formed which does not communicate with the exhaust port 25 but communicates with the first and second ports 22 and 23 via the through holes. Note that 36 is a connecting groove that allows the second recess 32 and third recess 33 to communicate with each other.

An elongated hole 26 communicating with the cylinder 21 passes through the central upper surface of the main body of the supply/exhaust switching mechanism configured as described above, and an engagement recess 37 is formed in the central upper surface of the switching valve body 30. Furthermore, both upper ends of the rocking piece 38, which has a substantially U-shape from the front, are connected to the side walls 19, 19 by the support shaft 3.
9 and 39, and an engaging pin 40 provided at the lower part of the swinging piece 38 is inserted into the elongated hole 28.
3 from above to engage the engagement recess 36 of the switching valve body 30, and engage the locking portion 41 at the center of the fork-like forked portion provided on the upper surface of the intermediate portion of the swinging piece 38 and the connecting rod. A compression spring 42 is interposed between the spring stopper 28 provided on the 14 side.

Thus, the reciprocating pump of the present invention supplies priming water to one of the pump chambers, for example 1, from the priming port (not shown), and on the other hand, the first port 22 and the first
On the other hand, the third port 24 and the second inlet/outlet 2' are communicated, and the second port 23 is communicated with a compressor (not shown), and the first and second water intake ports 4, 4 are communicated with each other. The compressor is driven with the tube connected to the water either directly or through a hose (not shown). In FIG. 3, compressed air supplied from the second port 23 passes through the first recess 31, is supplied from the first port 22 to the first inlet/outlet 2, is pressurized into the upper chamber A of the pump chamber, and is compressed into the first piston 12.
When pressed down, the water in the lower chamber B moves forward the ball valve 8 that closes the first valve port 9, opens the first valve port 9, and conversely closes the second valve port 9' and closes the connecting tube. The water is discharged from a spout 10 provided at 7 with a required discharge pressure. When the first piston descends as described above, the second piston 13' is pulled up via the connecting rod 14, and since the second valve port 9' is already closed, the lower chamber
Since the pressure inside B' is reduced, the second check valve 5' opens and sucks water into the lower chamber B' from the second water intake port 4'. As the second piston 12' rises, the air in the upper chamber A' is forced out from the second inlet/outlet 2', leading to the third port 24, the second recess 32, the communication groove 36, and the third recess 33.
It is then discharged into the atmosphere from the exhaust port 25. However, when the right side of the connecting rod 14 in FIG. 1 rises and rises above the horizontal line Y passing through the support shaft 18 as shown in FIG. 5, the support shaft 18 shown in FIG.
The shaft 16 moves to the right of the perpendicular X passing through the support shaft 39, and at the same time the spring 42 tilts in the opposite direction as shown by the dashed line in FIG.
Since the switching valve body 30 is pressed in the direction of the arrow E by the engaging portion 40, the valve body 30 moves in the same direction and switches the switching valve body 30. In this case, the first and second pistons 12, 12' are moved to the positions shown by the dashed lines in FIG.

Next, from the compressor to the second port 23,
When compressed air is supplied into the upper chamber A' of the second pump chamber 1' from the second inlet/outlet 2' via the second recess 32 and the third port 24, the second piston 12' descends.
While closing the second check valve 5', the ball valve 8
is advanced in the direction opposite to the arrow, and on the other hand, the second valve port 9' is opened.
to open the lower chamber and close the first valve port 9 on the other hand.
The water in B' is drained from the spout 10 via the second valve port 9'. In this case, water is sucked into the lower chamber B of the first pump chamber from the first water intake port 4 where the opened first check valve 15 exists.

A continuous pumping action is performed by repeating the above operations alternately.

As explained in detail above, in this invention, since the pump main body does not have any electrical parts, it can be used safely even when submerged in water. Since it is installed so that no dead center occurs due to the action of the interposed compression spring 42, the switching operation is smooth and a stable water pumping effect can be obtained. In addition, the amount of water discharged can be changed by changing the discharge amount of the compressor, which has the advantageous feature that it can also be used as a metering pump.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
The figure is a cross-sectional view of the entire structure with piping parts omitted; Figure 2 is a cross-sectional view of the supply/exhaust switching mechanism mainly showing the switching valve body and cylinder; Figure 3 is a vertical cross-sectional view of the main parts of the mechanism;
FIG. 4 is a partially cutaway front view showing the relationship between the connecting rod and the valve body of the same essential part, and FIG. 5 is an explanatory view showing the switching state of the switching valve body. 1 is a pump chamber, 2 is an inlet/outlet, 4 is a water intake port, 5 is a check valve, 7 is a connecting cylinder, 8 is a ball valve, 9 is a valve port, 10 is a water outlet, 12 is a piston, 13 is a rod, 14 is a A connecting rod, 20 a main body, 30 a switching valve body, 38 a rocking piece, and 42 a spring.

Claims (1)

[Scope of Claims] 1 A pair of pump chambers each having an air inlet/outlet and a water intake with a check valve at the lower part are formed, and the lower parts of the pump chambers are communicated with each other by a connecting tube, A discharge port is opened in the center of the connecting cylinder, and ball valves for alternately opening and closing the water intake ports of each of the pumps are housed in the connecting cylinder, while pistons are housed in the pump chambers so as to be able to move up and down. The upper part of each piston rod is connected to a connecting rod that slides about the center part, and a switching valve body is provided to switch the flow path of air sent from the compressor toward each pump chamber to the air inlet/outlet side on the other side. a protrusion integrally formed in the center of the connecting rod;
A reciprocating pump in which a pin body loosely engaged with the surface of a switching valve body is connected via a spring. 2. The reciprocating pump according to item 1 above, wherein the switching valve body is housed in a cylinder having an air inlet in the center, an air discharge inlet on both sides thereof, and an exhaust outlet on the radially opposite side of the air inlet. 3. The switching valve body has a pair of recesses on the outer periphery that alternately communicates one of the air discharge inlets with the air inlet and a pair of recesses that alternately communicate with the exhaust port,
A passage connecting a recess that is in communication with the air inlet and the air discharge inlet and a recess that is not in communication with the air outlet, and a passage that is not in communication with the air inlet but is in communication with the air outlet. 3. The reciprocating pump according to item 1 or 2 above, which has a passage connecting the recessed part and the recessed part in communication with the exhaust port.