JPH0522295Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a power sprayer having a plunger-type chemical liquid pumping section.

Conventionally, this type of sprayer has a plunger that slides back and forth in the cylinder through a plurality of gaskets made of V gaskets, oil-impregnated felt, etc., and the reciprocating movement of the plunger creates an inlet in the cylinder. The medicinal solution is inhaled through an inhalation valve, passed through a discharge valve, and discharged from a discharge port, passed through an air chamber (accumulator), smoothed the pulsation of discharge pressure, and then sprayed from a spray nozzle. However, the gasket that seals the plunger is easily damaged by friction with the plunger and heat generation, and furthermore, when the chemical liquid contains fine powder such as lime, such as Bordeaux liquid, the gasket is particularly damaged. Damage to the seal will inevitably lead to liquid leakage from the plunger seal, which will stain the sprayer, and if this is left untreated, there is a risk that the bearing of the drive unit will corrode. In addition, there is a drawback that maintenance management is quite troublesome.

Effects of the invention The present invention was developed in response to the above-mentioned circumstances. A pair of chemical liquid pressure feeding parts are symmetrically connected to the left and right sides of the plunger drive part, and the cylinder of one chemical liquid feeding part is connected symmetrically to the left and right sides of the plunger drive part. In a sprayer having a chemical liquid pressure feeding device configured such that a cylinder in the other chemical liquid force feeding section is in a chemical liquid discharge stroke when the cylinder is in the suction stroke, two or more gasket chambers are respectively provided around the inner walls of the pair of cylinders. By making the auxiliary packing chambers provided close to the plunger drive part communicate with each other through a communication pipe, leakage from the plunger seal part can be prevented and the plunger seal part can be lubricated by the chemical solution itself. The power sprayer is characterized by: Hereinafter, a detailed explanation will be given based on one embodiment.

FIG. 1 is a cross-sectional view showing the main parts of the sprayer according to the present invention in principle. , 2 are provided so that their central axes are in the same straight line, and a common plunger 3 is housed therein. Both ends 3a, 3a of the plunger 3 reach into pressurizing chambers 4, 4 provided in the cylinder head.
communicates with the suction port 6 via the suction valves 5, 5, and with the discharge ports 8, 8 via the discharge valves 7, 7, respectively. 1a, 1a, 1b, 1b are cylinders 2,
A main packing chamber and an auxiliary packing chamber are provided around the inner wall of 2, and the main packing chamber 1a is located closest to the pressurizing chamber 4, and the auxiliary packing chamber 1
b and 1b are provided closer to the drive shaft 13 than the main packing chamber. Main gaskets 9a, 9a made of V gaskets and auxiliary gaskets 9b, 9b for protecting the driving portion from leakage from the main gaskets are housed therein, forming a plunger seal portion. The auxiliary gaskets 9b, 9b are
In addition to the above purpose, it also serves to prevent air from being sucked in from the drive unit side during suction, which would occur if the seal of the main gasket is incomplete. The plunger 3 reciprocates within the cylinders 2, 2 by an eccentric ring 11.

13 is a rotary drive shaft taken out from the prime mover, 1
4 is a key that integrates the inner ring of the eccentric ring and the rotary drive shaft, and 15 is a coil spring. Such a configuration is no different from a conventional dual-acting dual-acting plunger pump. The features of the present invention are that the auxiliary packing chamber 1b provided in the two cylinders 2, 2,
1b are configured to communicate with each other through a communication conduit 16. With such a configuration, when the plunger 3 reciprocates, when the chemical solution in the pressurizing chamber 4 on the left side in the figure is pressurized, the plunger head 3a in the pressurizing chamber on the right side moves toward the drive shaft 13 side. The medicine solution is introduced from the inhalation port by retreating.
On the other hand, when the right-hand cylinder performs a process of pumping the chemical liquid through the discharge valve, the left-hand cylinder performs a suction process of the chemical liquid. Along with this, high pressure is applied to the auxiliary gasket 9b in the cylinder during the discharge stroke, and negative pressure is applied to the cylinder during the suction stroke, but the left and right auxiliary gasket chambers 1b, 1b are in communication with each other. Therefore, even if the sealing by the main packing is incomplete at high pressure and leakage reaches the auxiliary packing chamber, the negative pressure from the other side will reach the auxiliary packing chamber through the communication pipe 16. It flows toward the auxiliary packing chamber on the negative pressure side through the communication pipe without leaking to the drive unit side. Thus, even if the plunger reciprocates at high speed, leakage from the main gasket alternately moves toward the cylinder on the suction stroke side and is absorbed. Therefore, leakage to the outside is completely prevented, and the auxiliary gasket prevents air from flowing into the cylinder from the drive unit side during suction. or,
Since this leakage liquid itself reaches the sliding parts of the packing, it acts as a lubricating fluid and does not require oiling to the packing.

In this way, the pressurized liquid discharged from the discharge ports 8, 8 passes through an accumulator (not shown) as necessary to smooth out the pulsations in the discharge pressure, and is then sent to a spray nozzle (not shown). It is sprayed from to the spray target.
In this application, the main packing chamber means the one closer to the cylinder head side than the other packing chambers, and the auxiliary packing chamber means the one closer to the drive side than the other packing chambers, and this refers to the one closer to the drive side than the other packing chambers. The same is true even if the packing chambers are provided in one cylinder.

Effects The present invention can be employed in a plunger reciprocating sprayer of the type in which the suction stroke and discharge stroke are performed synchronously. In this type of sprayer, the main gasket is generally extremely prone to wear, and even if it is replaced with a new one, it will soon wear out and the seal will become incomplete. The present invention is particularly effective in such cases. In other words, in this state, the chemical liquid enters the small gap between the cylinder and the main packing, and lubrication by the chemical liquid is essentially achieved.
In addition, the auxiliary gasket provides self-lubrication and prevents air from being sucked in from the drive side, and the auxiliary gasket chambers that communicate with each other absorb leakage liquid, preventing liquid leakage and air suction into the cylinder. Complete prevention of this and self-lubrication of the sliding parts by the chemical solution are realized. Furthermore, if the communicating conduit is constructed of a transparent tube or the like, the degree of wear and tear on the packing can be determined by the amount of water in the communicating conduit, and the appropriate time to replace the packing can be easily determined. In this way, the simple structure completely prevents liquid leakage, and
It achieves self-lubrication and has the effect of greatly reducing the troublesome maintenance after use, removing the cylinder head to replace the gasket, and lubrication.

[Brief explanation of drawings]

FIG. 1 is a sectional view conceptually showing the main parts of the present invention.

Claims (1)

[Scope of utility model registration request] The cylinder is equipped with a plunger that slides back and forth through seal packings housed in a plurality of packing chambers circumferentially provided on the inner wall of the cylinder. , a pair of chemical liquid pressure feeding parts configured to discharge the chemical liquid to a discharge port communicating with the cylinder via a discharge valve are symmetrically connected to both sides of the plunger drive part,
In a sprayer having a chemical liquid force feeding device configured such that when the cylinder of one chemical liquid force feeding unit is in the chemical liquid suction stroke, the cylinder of the other chemical liquid force feeding unit is in the chemical liquid discharge stroke, the two cylinders are provided on the inner wall of the pair of cylinders, respectively. The main packing chamber and the auxiliary packing chamber are made to communicate with each other through a communication pipe, thereby preventing liquid leakage from the plunger seal portion and providing lubrication with a chemical solution. Characteristic power sprayer.