JPH0716057Y2 - Check valve device for blowing material pressure pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a check valve device for a pressure pump used in a spray gun for spraying paint.

"Prior art" Conventionally, there were snake type pumps and pumping tube type pressure pumps for cement-based spraying materials, but in both cases the pressure feeding pressure was low and the pressure feeding hose was large and inconvenient, so higher pressure was required. In order to obtain it, we tried to pump the cement-based spray material with a piston-plunger pump. The biggest problem in pressurizing the cement-based spray material with a piston pump was the valve structure. Structure of 150Kg / cm ² ~200Kg / cm ² ball valves are used a ball valve in the high pressure pump consists of a ball and the valve seat (valve seat), a valve seat immediately before the valve seat is closed by the ball Since the spray material flows through the gap between the ball and the ball, it is difficult for the ball to come into contact with the valve seat and the ball seat is not fully closed, so that the pressure does not rise. In particular, in the case of a relatively hard spray material, the above tendency is strong and the spray pressure suddenly decreases, making spraying difficult. Further, when the cement-based spray material is pressed, the cement-based spray material interferes with the close contact of the valve seat due to the vertical movement and pressurization of the ball valve. Further, it is difficult to pump the sand-aggregate-containing material under pressure. This is because sand-bone particles are trapped between the ball valve and the valve seat, causing a pressure leak and losing the effectiveness of the check valve.

"Problems to be solved by the invention" The present invention proposes that a ball valve element is brought into sufficient contact with the valve seat when the valve is closed to sufficiently raise the pump spraying pressure, so that a relatively hard (less fluid) spraying material or sand is used. It is an object of the present invention to obtain a check valve device for a blowing material pressure-feeding pump capable of spraying a bone-mixed material at high pressure for a long time.

In order to achieve the above-mentioned object, the present invention fits a reciprocating piston or a plunger in a cylinder, accommodates a ball valve element that operates when the piston or the plunger reciprocates, and In a valve chamber of a reciprocating pump including a valve seat of a valve body, an elevating guide cylinder for the valve body is provided on an upper surface of a diameter-increasing step formed on the outer periphery of the valve seat, and a spiral shape is provided on an inner surface of the guide cylinder. It is composed of a check valve device of a blowing material pressure feed pump having a groove.

"Action" Therefore, the piston or the plunger 7 rises and a negative pressure suction action occurs, whereby the ball valve body 2 rises from the valve seat 1 to a position above the elevating guide cylinder 4 to reduce the pressure in the valve chamber 8 and thereby the valve chamber. 8 is filled with the spray material from the inlet 9 by suction. When the ball valve body 2 is lowered by its own weight, the spray material and the ball valve body 2 are swung by the spiral groove 6 in the guide cylinder 4 and seated on the valve seat 1 to close the inlet 9, and in that state. The piston or plunger 7 descends and the pressurizing operation starts. When the weight is lowered, the valve body 2 enters the guide cylinder 4. At this time, pressure is applied to the upper surface of the ball valve body 2 by the spray material in the valve chamber 8, and the strong flow of the spray material between the valve body 2 and the valve seat 1 is reduced, so that the valve body 2 Swivels and presses against the valve seat 1 as described above. Therefore, the pressure in the valve chamber 8 rises. Then piston or plunger 7
As a result, the inside of the valve chamber 8 is decompressed, the blowing material is sucked from the inlet 9, and the ball valve element 2 is repeatedly moved upward above the guide cylinder 4 as described above.

The sprayed material at the time of pressurization in the valve chamber 8 is concentrated in the guide cylinder 4 and a downward pressure is applied to the ball valve body 2, and at the same time, the sprayed material passes through the spiral groove 6 and the inside of the guide cylinder 4 and the balls. A spiral flow is generated around the valve body 2 and a lateral rotational force is applied to the ball valve body 2 so that the ball valve body 2 turns as described above. Therefore, the sand-bone particles on the contact surface between the ball valve body 2 and the valve seat 1 are removed from the contact surface by the rotation of the ball valve body 2, and sufficient downward contact is obtained by the downward pressure applied to the upper surface of the ball valve body 2.

[Embodiment] An upright reciprocating pump 12 is provided in a machine box 11 provided in a machine frame 10, and a suction pipe 13 is vertically provided at a lower end. The pump 12 has a reciprocating piston or plunger 7 slidably fitted in a cylinder 14, and check valve chambers 8, 8 are provided at the lower end of the cylinder 14 and in the middle of the piston or plunger 7. A ball valve body 2 is housed in the valve chambers 8 and a valve seat 1 of the valve body 2 is formed. This valve seat 1 is provided at the upper end of the inlet 9, and an enlarged diameter step surface is provided on the outer circumference of the valve seat 1 in the valve chamber 8
Formed on the side. The valve seat 1 is formed by a rounded surface or a tapered surface and contacts the ball valve body 2 in a substantially linear or planar shape. The ball valve element 2 is provided on the upper surface 3 of the expanded step surface.
Is provided with an elevating guide cylinder 4, and the valve body 2 is provided at the upper end of the guide cylinder 4.
And the plurality of spiral grooves 6 are formed in the inner peripheral surface of the guide cylinder 4. As the spray material, a sand-bone mixture material such as a water / cement / stone powder mixture or a water / acrylic / stone powder mixture is used. Reference numeral 15 in the figure denotes a ball lift stopper, 16 denotes an outlet of the valve chamber 8, 17
Cylinder 14 outlet, 18 pressure automatic control machine,
Reference numeral 19 is a pressure gauge, 20 is a spray material transportation pipe, 21 is a spray gun for spraying, 22 is a compressed air hose for spraying, and 23 is a drain hose.

"Effect" Since the present invention is configured as described above, even if a relatively hard spray material such as sand-bone particles is used, the formation of a fluidized bed between the ball valve body 2 and the valve seat 1 is small and the valve body 2 is small. The upper surface of the valve body 2 is pushed by the internal pressure of the valve chamber 8 so that the valve body 2 turns laterally and comes into contact with the valve seat 1, so that the pressure in the valve chamber 8 can be remarkably improved. There is an effect that a sufficient spray pressure of a relatively hard spray material can be maintained for a long time.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a check valve device of a blowing material pressure pump of the present invention, FIG. 2 is a cutaway perspective view of a reciprocating pump, and FIG. 3 is a perspective view of an entire coating device. 1 ... Valve seat, 2 ... Ball valve element, 3 ... Expansion step upper surface, 4
...... Lifting guide tube, 6 ...... Spiral groove.

Claims (1)

[Scope of utility model registration request] 1. A valve chamber of a reciprocating pump comprising a reciprocating piston or a plunger fitted in a cylinder, a ball valve body which operates when the piston or the plunger reciprocates, and a valve seat of the valve body. A check valve for a blowing material pressure pump in which a lifting guide cylinder for the valve body is provided on the upper surface of the expanded diameter step formed on the outer periphery of the valve seat, and a spiral groove is formed on the inner surface of the guide cylinder. apparatus.