JPS6016796Y2 - pump air supply device - Google Patents

Description

[Detailed Description of the Invention] The present invention is designed to prevent variations in the amount of air replenishment in an air replenishment device for a pump.

The present invention will be explained below with reference to the drawings. Reference numeral 1 denotes an air replenishing device, which consists of a case 3 housing a ball-shaped float valve 2 therein, and a base member 4 that closes an opening at the lower end of the case 3.

The case 3 has an air intake port 5 and an air supply port 6 at its upper end, and a ball valve 7 is provided at the air intake port 5.
and spring 8 are housed therein.

Reference numeral 9 denotes a cap attached to the air intake port 5, which accommodates the valve seat 10 against which the ball valve 7 comes into contact, and has a vent hole 11.11 bored at its upper end.

On the other hand, a ball valve 12 is also accommodated within the air supply port 6, and a retaining plate 13 is attached to the opening.

Further, the base member 4 has a water passage hole 14 in the center thereof, and a valve seat 1 in the form of an annular flat plate having elasticity at the edge of the opening.
5, and an annular projection 16 is integrally formed so as to surround this valve seat.

Threads are cut on the inner and outer circumferential surfaces of this annular protrusion, and a valve seat retainer 17 is screwed into the thread on the inner circumferential surface to fix the valve seat 15 so that it does not move.

This valve seat holder 17 is taller than the annular projection 16,
The inner circumferential surface 18 tapers toward the upper end, and the diameter of the upper end opening is approximately equal to the inner diameter of the case 3.

In addition, a plurality of over-tightening prevention pieces 19 are protruded from the outer peripheral surface of the valve seat holder 17, so that when the valve seat holder 17 is screwed onto the annular protrusion 16, it may be screwed too deeply. Valve seat 1
5 is pressed down with excessive force to prevent the elasticity from being lost or the opening shape to collapse.

The base member 4 with the valve seat 15 fixed by the valve seat retainer 17 is attached to the case 3 by inserting and screwing the annular projection 16 into the lower end opening of the case 3, thereby closing the lower end opening.

20 is an annular backing for preventing water leakage.

The air replenishing device 1 of the present invention has the above structure, but when in use, the air supply port 6 is connected to the auxiliary tank of the pump by a pipe (not shown), and the water inlet 14 is connected to the suction side of the pump.

With this connection, when the pump is stopped, water enters the air supply device through the water inlet 14 and the float valve 2 floats there, but when the pump is operated, water in the air supply device flows into the air supply device. is drawn to the suction side.

As a result, a negative pressure is created in the air supply device 1, and the ball valve 7 is pulled down against the spring 8, causing the vent hole 11.1 to be pulled down.
1 and air intake 5 into this air supply device.

When the pump stops, water flows into the air supply device 1 again through the water inlet 14, so the air in the air supply device pushes open the ball valve 12 in the air supply port 6 and enters the pre-pressure tank. Provide air supply.

In the conventional air supply device, the height of the valve seat retainer 17 is lower than the annular projection 16, and the inner circumferential surface near the upper end opening is not tapered as in the present invention, so that when the water level drops, the float The valve 2 hits the upper edge of the annular protrusion 16 or hits the upper edge of the valve seat holder, causing variations in the time it takes to close the water inlet 14, and as a result, the amount of air supplied is not constant. Ta.

In this case, the valve seat retainer 17 is higher than the annular protrusion 16, and the inner peripheral surface is expanded in a tapered manner, so that when the water level drops, the float valve 2 moves toward the water inlet 14. It is guided smoothly and the closer it gets to the water inlet, the faster it hits the valve seat 15, so the water inlet is reliably closed and there is no variation in the time it takes to close.

As described above, in the present invention, the valve seat holder 17 is made higher than the annular protrusion 16 provided on the base member, and the inner peripheral surface of the valve seat holder is expanded upward, so that the upper and lower parts of the float valve 2 are At the same time as the movement becomes smoother, the force hitting the valve seat 15 becomes stronger, and unlike conventional float valves, when the water level drops, the amount of air replenishment may vary, or the force hitting the valve seat may be weak, causing the water inlet to close. is never incomplete.

Furthermore, since the valve seat holder 17 is higher than the annular projection 16, it is easy to screw the valve seat holder onto the annular projection 16, and the valve seat made of an elastic material can be formed into a flat plate shape. Since the over-tightening prevention piece is provided on the presser foot, it is possible to prevent the opening shape of the valve seat from collapsing due to over-tightening of the valve seat presser, prevent air leakage into the pump body, and eliminate the fear that the pump will be unable to pump water.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of the air replenishment device of the present invention. 5...Air intake port, 6...Air supply port, 2
...Float valve, 3...Case, 14
...Water port, 15...Valve seat, 16...
... Annular projection, 4 ... Base member, 17.
... Valve seat holder, 19 ... Over-tightening prevention piece.

Claims (1)

[Scope of utility model registration request] The case has an air intake port and an air supply port at the top and a ball-shaped float valve inside, and a water inlet in the center and a resilient flat valve seat on the edge of the opening. The base member has an annular protrusion protruding from its upper surface that is screwed into the lower end opening of the case, and a valve seat holder that is threaded onto the inner peripheral surface of the annular protrusion. An air replenishing device for a pump, which is made higher than the protrusion and has its upper end opening widened to near the inner diameter of the case, and has an over-tightening prevention piece formed on the outer periphery that touches the upper end of the annular protrusion.