JPH0437652Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a liquid chemical pressure pump for a power sprayer, and particularly relates to a pressure regulator mechanism that allows easy setting of spray pressure.

Prior Art As shown in FIG. 5, this type of device includes, for example, a valve body 56 having a passage 55 that communicates a pressure regulation port 52 of a pump 60 with a spillage port 54, and a pressure regulation port in the passage 55. This handle is attached to the inner surface of the pump, which consists of a valve body 58 that sits facing a valve seat 57 provided on the side, and a pressure regulating spring holder 50 that compresses a pressure regulating spring 59 between the valve body 58. A cam groove 6 having an appropriate number of steps concentrically with the rotation center 68 of the cam groove 6.
5, and a pressure regulating spring holder 50 is installed in this cam groove.
Pumps are known that have a pressure regulating valve that adjusts pressure by abutting a guide shaft 50a protruding from the guide shaft as a driven joint. (Refer to Japanese Utility Model Application Publication No. 60-102558.) However, this pump is, for example, a chemical liquid pressure pump for a spray machine whose drive source is a small internal combustion engine 72 attached to the lower part of a backpack-type chemical liquid tank 71 as shown in FIG. 60, even if you try to operate the handle 64 while carrying the tank 71 on your back with the backpack strap 73, you will not be able to clearly determine the pressure setting position of the handle with just your sense of touch, so you will have to adjust the pressure every time you change the spray pressure. It was a hassle to lower the heavy tank and set the discharge pressure.
In addition, in the mechanism in which the guide shaft 50a slides in the cam groove 65, the spring pressure of the pressure regulating spring 59 is concentrated at the tip of the thin guide shaft 50a, so the cam groove is greatly worn down and the pressure setting gradually changes. I was afraid I was going crazy.

Composition of the invention The present invention provides a pump for an atomizer equipped with a pressure adjustment mechanism in which the pressure setting position can be clearly felt when operating the handle, and an error in the setting pressure is unlikely to occur. , its gist is that it communicates with the chemical liquid discharge flow path of the chemical liquid pressure pump through a pressure regulating valve body, and has a valve chamber with a spill outlet opening at an appropriate location, and a valve chamber that is movably housed in this valve chamber and controls the pressure regulating valve body. A valve rod that presses against a valve seat provided on the discharge flow path side via a spring is provided.The other end of the valve rod has a substantially polygonal cross-sectional shape, and the distance from each side to the center of the cam rotation axis is provided. A power sprayer in which the spray pressure is set by rotatably engaging a pressure regulating cam whose length is gradually increased, and by rotating the rotating shaft of the pressure regulating cam with a pressure setting handle. It is found in mechanical chemical liquid pressure pumps.

Examples will be described below with reference to the drawings.

FIG. 1 shows an opposed plunger pump for force-feeding a chemical liquid, which is an embodiment of the present invention, in which a plunger 30 that reciprocates in a cylinder 31 serving as a pressurized chamber for medical liquid is supplied to an inlet 32a. It enters the suction passage 32 through the suction passage 32, opens the suction valve 33 that partitions the passage 32 and the cylinder 31, enters the cylinder 31 and is pressurized, opens the discharge valve 35, reaches the discharge passage 36, and opens the discharge port. 36a to the spray nozzle side, and this operation is repeated alternately on both head sides of the plunger 30. A cylinder 1 communicating with the upper peripheral surface is integrally provided in this discharge flow path 36, and a screw cap 2 that closes the opening is screwed into the upper end opening of the cylinder 1. Lid 2
A pressure fine adjustment screw 3 is screwed through the center of the pressure adjustment screw 3. Adjacent to the protruding end of the pressure fine adjustment screw 3 into the cylinder 1, a protruding edge 4b is placed on the upper and lower ends of a floating rod 4a coaxial with the cylinder 1, and slides into contact with the inner circumferential surface of the cylinder via O-rings 4c, 4c. , 4b.
is stored in the floating rod 4a, and a discharge flow path 3 is stored in the floating rod 4a.
A communication hole 4d is bored through which the valve chamber 5, which is comprised of the space inside the cylinder 1 below the floating valve seat 4, communicates with the valve chamber 5.
The pressure regulating valve body 6 is pressed by the elastic force of the pressure regulating spring 7 to the opening end 4e of the communication hole 4d, which opens near the center of the lower projecting edge 4b. Reference numeral 8 denotes a valve rod that presses down the pressure regulating spring 7, which is a compression coil spring, and is slidably housed in the valve chamber 5 via an O-ring that is fitted into a circumferential groove 8a of the valve rod. The lower end 8b of the valve rod 8 engages with a pressure regulating cam 9 supported so as to be rotatable integrally with a cam rotation shaft 10 pivotally mounted on the lower end of the cylinder 1 in a direction perpendicular to the cylinder 1.
Reference numeral 11 designates a pressure setting handle fixed to one side of the cam rotation shaft 9, and reference numeral 5a designates a water spill port opening in the peripheral wall of the valve chamber 5.

The pressure regulating cam 9 has an approximately pentagonal cross-sectional shape, and its rotation shaft 10 is mounted at an eccentric position, so that the rotation center 1 is located from each side 9a to d of the approximately pentagon.
The length up to 0a is gradually increased. With this, for example, when the surfaces defined by the sides 9a to 9d are respectively engaged with the lower end positions of the valve rod 8,
The discharge pressure can be set to 0, 10, 20, or 25 kg/cm ² . To correct pressure errors during assembly or when replacing the pressure regulating valve body, pressure regulating spring, etc. based on the dimensions of the valve rod and spring pressure, turn the pressure fine adjustment screw 3 and adjust the floating valve seat 4. Adjusted by moving. In Figure 2, 9
e is a ridge that prevents further rotation of the cam, 1
Reference numeral 1a denotes a small ball that presses the side surface of the cam with spring pressure from the handle side, and is used to help the user feel the position of the handle by fitting into the positioning hole 9f on the side surface of the cam. In the above embodiment, the cam cross section was approximately pentagonal with rounded corners, but this can be increased or decreased as necessary, and the rounded corners are not essential.

Effects In the liquid chemical pressure pump for spraying machines of the present invention, the valve rod 8 and the pressure regulating cam 9 are engaged with each other over an incomparably large area compared to the conventional ones, so it can be carried on a person's back as shown in Fig. 5. When used in a power sprayer, when setting or changing the spray pressure, the pressure setting position of the handle can be touched without having to lower the heavy tank each time and visually check the position of the pressure setting handle. It is possible to know. Especially in the right place of the handle 11,
Triangular raised knob 11c and protrusion 11b
It will be even easier if you add a guide consisting of etc. In addition, the large-area engagement causes less wear on the cam and the valve rod that engages with the cam, so that the set pressure at the time of assembly is accurately maintained for a long time and does not go out of order.
In addition, in the past, for example, in the case shown in FIG. 5, it was often troublesome to change the thickness of the washer 61 to prevent deviations in the set pressure due to parts replacement or variations in the dimensions of assembled parts. In the case of a pump, this can be done extremely easily and accurately by loosening the nut 3a, turning the pressure fine adjustment screw 3, and displacing the floating valve seat 4, which is highly practical.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention. FIG. 2 is a sectional view taken along line A-A in FIG. FIG. 3 is an explanatory diagram showing the main parts of another embodiment of the present invention. FIG. 4 is an explanatory diagram showing an example of use of the present invention. FIG. 5 is an explanatory diagram showing an example of the prior art.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A liquid medicine suction flow path, a liquid medicine pressure chamber communicating with the suction flow path via a suction valve, and a liquid medicine discharge flow communicating with the pressurization chamber via a discharge valve. A liquid chemical pressure feeding pump having a valve chamber which communicates with the chemical liquid discharge flow path side via a pressure regulating valve body and has a spillway opening, and a valve chamber which is movably housed in the valve chamber and controls the pressure regulating valve body. a valve rod that is in pressure contact with a valve seat provided on the side of the chemical liquid discharge flow path via a pressure spring; the end of the valve rod has a substantially polygonal cross section, and a cam rotation shaft is attached from each side of the substantially polygonal shape; The distance to the center is
For a power sprayer, characterized in that the spray pressure can be set in stages by rotatably engaging different pressure regulating cams and turning a pressure setting handle that rotates integrally with the cam rotation shaft. Chemical liquid pressure pump. (2) The liquid chemical pressure pump according to claim 1, wherein the pressure setting handle is provided with a guide that allows the rotational position of the handle to be felt.