JPH0414127Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a pulsation absorbing device that is connected to the discharge side of a liquid pump in a power sprayer and absorbs pulsations in the discharge pressure of the liquid pump by changing the volume of air. It is.

[Conventional technology]

In FIG. 3, a power sprayer equipped with a conventional pulsation absorbing device will be explained. This power sprayer is used, for example, as a chemical sprayer for spraying chemicals onto fields. A crankshaft 12 is disposed in the crankcase 10, and the crankshaft 12 is rotatably supported by the crankcase 10 at both ends. The liquid pump 14 has a piston rod 1 disposed in a cylinder pipe 16 connected to the crankcase 10.
8, and the piston rod 18 is connected to the crankshaft 12 via a connecting rod 20 at its base end. The piston body 22 is loosely fitted to the tip end of the piston rod 18, and the liquid in the suction port 24 passes through the gap on the inner peripheral side of the piston body 22 as the piston rod 18 moves toward the crankshaft 12. Then, it is guided to the pump chamber 26. The discharge valve 28 is arranged between the pump chamber 26 and the discharge part 30 and is pushed open upon movement of the piston rod 18 towards the discharge valve 28 so that the liquid in the pump chamber 26 is discharged through the discharge valve 28. part 3
It leads to 0. The pressure regulating valve 32 is connected to the cylinder pipe 1
When the pressure of the liquid in the discharge part 30 exceeds a predetermined value, the valve body 36 built in the pressure regulating valve 32 is pressed. When the valve is opened, the liquid returns to the tank through the spill port (not shown) of the pressure regulating valve 32, thereby adjusting the discharge pressure of the liquid pump 14 to a constant value. The pulsation absorber 38 is connected to the housing 4
0, and the connection port 42 at the bottom of the housing 40 is attached to the cylinder tip 34. Housing 4
The discharge portion 3 is connected to the internal space of 0 through the connection port 42.
Liquid enters the housing 40 from the
The interior space of is divided into an upper air part 44 and a lower liquid part 46. Pressure gauge 48 is in communication with discharge portion 30 via needle valve 50 and indicates the discharge pressure of liquid pump 14 .

As the liquid pressure pulsates in the discharge part 30, the height of the upper surface of the liquid part 46 in the pulsation absorbing device 38 changes, and the volume of the air part 44 changes, so that the pulsations in the discharge pressure of the liquid pump 14 are absorbed. be done.

[The problem that the idea attempts to solve]

However, the air in the air portion 44 within the housing 40 contacts the liquid in the pressurized liquid portion 46 and also
Since the upper surface of the pump 6 vibrates violently with the pressure pulsations in the liquid portion 46, there is a problem in that the air in the air portion 44 dissolves into the liquid in the liquid portion 46 and decreases as the operating time of the liquid pump 14 passes. A decrease in the air portion 44 in the housing 40 causes a decline in the function of the pulsation absorber 38, resulting in damage to the pressure gauge 48, abnormal vibrations in the piping, hoses, liquid pump, and installation frame, and uneven wear and valve noise in the pressure regulating valve 32. etc., which may cause various problems.

The purpose of this invention is to provide a pulsation absorbing device for a power sprayer that can suppress a decrease in the amount of air within the housing.

[Means to solve the problem]

According to the pulsation absorbing device for a power sprayer of this invention, in the pulsation absorbing device in which a blind member is fitted to the upper edge of the housing disposed on the discharge side of the liquid pump, a plurality of appropriately shaped A floating member 62 formed in
The floating member 62 is detachably fixed to the housing 40 so that the surface of the liquid inserted into the housing 40 can be covered by the floating member 62.

[Effect]

As the liquid pump operates, liquid flows into the housing. The floating member contained in the housing floats on the surface of the liquid flowing into the housing and covers the liquid surface, substantially shielding the air on the upper side from the liquid on the lower side from each other. Prevent contact between air and liquid.

The liquid level within the housing moves up and down in relation to the pulsations in the discharge pressure of the liquid pump 14, and the floating member also moves up and down accordingly. As a result, the volume of the air portion of the housing increases or decreases, and pulsations in the discharge pressure of the liquid pump are buffered.

Each floating member is connected to each other by passing through a wire member, and is also connected to a blind member on the upper part of the housing via the wire member, so that the floating member is prevented from coming out of the housing along with the liquid. be done.

[Example] An example of this invention will be described below with reference to FIGS. 1 and 2. In addition, the parts already explained in FIG. 3 are given the same reference numerals, and the explanation thereof will be omitted.

FIG. 1 is a view of a power sprayer equipped with a pulsation absorbing device according to this invention seen from the tip side. Power is transmitted from the prime mover and coupled to the crankshaft 12. The screw hole 54 is provided at the top of the housing 40, and the plug 56 is screwed into the screw hole 54 to close the screw hole 54 and maintain airtightness within the housing 40.

FIG. 2 is a detailed view of the liquid surface covering member 58, and the liquid surface covering member 58 has a bead-like structure. That is, the plurality of wires 60 are connected to each other at both ends, and each wire 60 passes through a plurality of, for example, spherical floating members 62 to connect the floating members 62 to each other.

Returning to FIG. 1, the liquid level covering member 58 is inserted into the housing 40 through the screw hole 54. The through hole 64 is bored through the plug 56 in its diametrical direction at the lower end thereof, and the portion of the wire 60 exposed from the floating member 62 is inserted through the through hole 64 . As a result, the liquid surface coating member 58
It is now connected to 6. Also wire 6
By untying the knot 0, the liquid surface covering member 58 can be disconnected from the plug 56.

The operation of the embodiment will be explained.

With the operation of the liquid pump 14, the connection port 42
Liquid flows into the housing 40 from the discharge portion 30 through the discharge portion 30 . Due to its light weight, floating member 62 floats on the surface of liquid portion 46 . The floating member 62 is distributed over and covers the liquid surface in multiple layers and blocks the air portion 44 from the liquid portion 46 . This prevents the air in the air portion 44 from dissolving into the liquid in the liquid portion 46 and exiting the housing 40 along with the liquid in the liquid portion 46.

As the discharge pressure of the liquid pump 14 pulsates, the liquid level of the liquid portion 46 moves up and down, and in relation to this, the layer of the floating member 62 also moves up and down. In this way, the volume of the air portion 44 increases or decreases, and pulsations in the discharge pressure of the liquid pump 14 are absorbed.

The liquid level covering member 58 is connected to the lower end of the plug 56 via a portion of the wire 60, thereby preventing the liquid portion 46 from leaving the housing 40 as the liquid flows out of the housing 40. be done.

[Effect of idea]

As described above, according to this invention, the floating member is placed inside the housing and covers the surface of the liquid that has flowed into the housing, thereby almost blocking the air inside the housing from the liquid. The air dissolves in the liquid and is prevented from flowing out of the housing. In this way, the amount of air in the housing can be prevented from decreasing, and the function of the pulsation absorbing device can be maintained well.

In addition, each floating member is connected to each other by a filament member and to a blind member on the upper part of the housing, so that the floating member will come out of the housing as the liquid flows out from the housing. can be prevented.

[Brief explanation of drawings]

Figure 1 is a view of a power sprayer equipped with a pulsation absorbing device according to this invention, viewed from the tip side, and Figure 2 is a view of the power sprayer equipped with a pulsation absorbing device according to this invention.
3 is a detailed view of the liquid surface coating member shown in the figure, and FIG. 3 is a sectional view of a power sprayer equipped with a conventional pulsation absorbing device viewed from the side. 14...Liquid pump, 38...Pulsation absorber,
40...Housing, 44...Air portion (air chamber), 56...Plug (blind member), 60...Wire (striate member), 62...Floating member.

Claims (1)

[Scope of utility model registration request] In a pulsation absorbing device in which a blind member is fitted to the upper edge of a housing disposed on the discharge side of a liquid pump,
Inside the housing 40, a plurality of floating members 62 formed into an appropriate shape are secured in a bead-like manner by a filament member 60, and both ends of the filament member 60 are removably fixed to the blind member 56. and said housing 40
A pulsation absorbing device for a power sprayer, in which the floating member 62 can cover the surface of the liquid inserted therein.