JPS6143556Y2 - - Google Patents

Description

[Detailed description of the invention] This invention provides that when spraying is temporarily stopped during spraying,
This is a reflux valve for an atomizer that is installed to prevent the pressure between the pump and the valve from becoming abnormally high.It has a coil spring shape that biases the valve body in a direction that keeps the valve body in constant contact with the valve seat of the valve case. The purpose of this improvement is to prevent abnormal noise from occurring when the valve body opens and liquid passes through the coil spring.

An embodiment of the present invention will now be described with reference to the accompanying drawings. Fig. 1 shows the associated structure from the suction port to the nozzle of the sprayer. 1 is a pump,
The pump is connected to a motor and driven by a battery or an AC power source. The suction port 2 of the pump 1 is inserted into a liquid container to suck up the liquid from the pump 1. The discharge hose of the pump 1 is connected to a reflux valve 4.
Reference numeral 5 denotes a nozzle which communicates with the reflux valve 4 via a communication pipe 6, and an opening/closing knockout 7 is provided midway along the communication pipe 6. This opening/closing knockout 7 is operated to temporarily stop the spray from the nozzle 5, thereby closing the passage of the communication pipe 6.

Figure 2 shows the internal structure of the reflux valve 4.
8 is a valve case having a suction port 9 to which the discharge hose 3 of the pump 1 is connected and a discharge port 10 communicating with the nozzle 5; 11 is a valve case corresponding to the discharge port 10 and located below the suction port 9; A valve seat is provided at 8, a valve body 12 is biased by a coil spring 13 in a direction in which it is always in contact with the valve seat 11, and 14 supports an end of the coil spring 13, and is detachable by being screwed into the valve case 8. The outlet case is attached to the outlet case and has a reflux port 15. The coil spring 13 has a conical shape on the valve body 12 side and a cylindrical shape on the outlet case 14 side. It is in contact with the

The reflux valve 4 is normally closed when the opening/closing knob 7 is open, and the valve body 12 is in contact with the valve seat 11, so that the liquid sucked up by the pump 1 is sucked into the reflux valve 4. It is sprayed from the nozzle 5 through the port 9, the discharge port 10, and the communication pipe 6. When the opening/closing pot 7 is closed to temporarily stop spraying during this spraying, the pressure in the passage connecting the pump 1 and the opening/closing pot 7 becomes abnormally high, but since the reflux valve 4 is provided, the reflux valve 4, the valve body 12 is pushed down and opened due to the pressure increase. As a result, the liquid sucked up by the pump 1 passes between the valve body 12 and the valve seat 11 from the suction port 9 of the reflux valve 4, and then passes between the coil wires of the conical part of the coil spring 13 as shown in FIG. The liquid is returned to the liquid container through the reflux port 15 of the outlet case 14 shown in FIG.

The coil spring 13' in the conventional reflux valve 4' is
As shown in Fig. 4, since it was constructed in a simple cylindrical shape, when the opening/closing pot is closed and the reflux valve 4' is opened to temporarily stop spraying during spraying, the liquid sucked up by the pump will be removed from the reflux valve. 4', passes between the valve body 12' and the valve seat 11' through the suction port 9', and then passes between the coil wires of the cylindrical coil spring 13' as shown in Figs. 5a and 5b, as shown in Fig. 4. The liquid is returned to the liquid container through the reflux port 15' of the outlet case 14'. However, in this conventional reflux valve 4', when the liquid sucked up by the pump passes between the coil wires of the coil spring 13', the coil spring 13' generates small vibrations in the vertical direction due to the opening and closing of the valve body 12'. At the same time, when the liquid passes between the coil wires, the passage of the liquid is obstructed by the compression of the coil spring 13' and is not uniformly distributed around the entire circumference of the coil spring 13', causing an imbalance and causing the coil spring 13' to oscillate laterally. As a result, intermittent flow of liquid occurs and abnormal noise is generated.

However, according to the present invention, the coil spring is configured to have a conical shape on the valve body side and a cylindrical shape on the outlet case side, and the cylindrical portion of the coil spring is brought into contact with the inner surface of the valve case. When the opening/closing switch is closed and the reflux valve is opened to temporarily stop spraying during spraying, the liquid sucked up by the pump passes between the valve body and the valve seat from the suction port of the reflux valve, and then passes through the coil of the conical part of the coil spring. It passes only between the wires and directly reaches the reflux port of the outlet case, which means that the coil spring will not cause small vibrations in the vertical direction, or intermittent flow will occur in the liquid due to horizontal vibration. Not,
As a result, it is possible to prevent abnormal sounds from occurring.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the relationship from the suction port of the sprayer to the nozzle, Fig. 2 is a sectional view of a reflux valve showing an embodiment of the present invention, Fig. 3 is a sectional view of a coil spring in the reflux valve, and Fig. 3 is a sectional view of a coil spring in the reflux valve. Fig. 4 is a sectional view of a conventional reflux valve, and Fig. 5 is a sectional view showing the operation of a coil spring in the reflux valve.
b shows the state when the valve body is completely opened. 1... pump, 5... nozzle, 8... valve case, 9... suction port, 10... discharge port, 11... valve seat, 12... valve body, 13... coil spring, 14...
...Exit case, 15...reflux port.

Claims (1)

[Scope of utility model registration request] A valve case has a suction port that communicates with the pump and a discharge port that communicates with a nozzle that is opened and closed by an opening/closing knob, a valve seat provided in the valve case, and a valve seat that is biased by a coil spring in a direction that constantly contacts the valve seat. a valve body; and an outlet case that supports an end of the coil spring and has a reflux port; the coil spring has a conical shape on the valve body side and a cylindrical shape on the outlet case side; A reflux valve for an atomizer, characterized in that a cylindrical part of a coil spring is brought into contact with an inner surface of a valve case.