JPS5830367A - Constant discharge valve - Google Patents

Abstract

PURPOSE:To enhance reliability of products and reduce cost by incorporating a differential piston in a valve body and threrby discharging a fixed quantity of liquid at constant velocity of flow. CONSTITUTION:The valve body consists of a main body 1 of the valve body, an intermediate member 2 of the valve body and a top member 3 of the valve body. A valve spool 4 and a liquid pump piston 5 are built in the valve body with permitted vertical movement. A nozzle 6 is screwed at the lower tip of the main body 1 of the valve body. Liquid sent by pressure passes 4b from a liquid conduit 4a provided at the center of the valve spool 4, and optionally fixed quantity of the liquid is enclosed in a pump chamber 1a in the valve body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a constant discharge valve, and is particularly suitable as a constant discharge valve for applying high viscosity liquid agents such as liquid gaskets to adhesive surfaces such as oil pans. .

Conventionally, when applying high-viscosity liquids such as liquid gaskets to adhesive surfaces such as oil pans, the liquid was pressurized using a large-capacity air pong with a high compression ratio, passed through piping or hoses, and a switching valve with a nozzle attached to the tip was used. The flow rate was fully controlled using a regulator and flow rate adjustment valve. However, this conventional method has no problems with high viscosity materials, such as grease, but when used with highly viscous and extremely aerobic liquids such as liquid gaskets, the pump characteristics There are large fluctuations in the discharge amount and discharge flow rate due to pressure fluctuations due to pressure fluctuations or hardening of the liquid in piping and nozzles.Also, due to the high viscosity, the response is slow even when the valve is switched, and the liquid does not flow autonomously, so the nozzle There were problems such as poor cutting from the tip, a stringy liquid dripping down, hardening on contact with the atmosphere, and making it impossible to eject when reapplying.

The present invention has been made to solve the above-mentioned problems of the conventional ones, and its overall purpose is to provide a constant discharge pulp that discharges all the liquid required for one cycle in one stroke and at a constant volume and flow rate. It is something.

The constant discharge pulp of the present invention includes a valve spool and a differential piston of a liquid pump piston that are reciprocatably housed in a pulp body, and a nozzle that is attached to the tip of the pulp body, and A liquid is formed between the pulp spool, the liquid pump piston, and the pulp body, and temporarily stores a certain amount of the liquid from the liquid pipe of the spool, and the stored liquid is removed by moving the pump piston to one side. a pump chamber configured to be pressurized, and the spool is provided with a liquid passageway between the pump chamber and the nozzle conduit of the nozzle, which is communicated with the spool by movement of the spool to one side;
A conduit is provided that closes the liquid passage by moving the spool to the other side and draws the liquid remaining in the nozzle.kt+! It shall be ＠.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the pulp body is a pulp body main body 1.
, a pulp body intermediate member 2, and a pulp body top part 3. A valve spool 4 and a liquid pump piston 5 are housed in the pulp body so as to be movable up and down. Further, a nozzle 6 is screwed onto the lower end of the valve body main body 1. In addition, 7 is an air needle valve,
8 is a check valve, and 9 is an adjustment nut.

In the constant discharge pulp configured as shown in FIG. 4b, a predetermined amount of the liquid is sealed in the pump chamber 1a in the pulp body main body 1. At this time, the air for pulp switching passes through the pipe line 1d and 2a, and is branched into pulp switching air and pump air, and pressurizes the pressurizing chambers 2b and 20 to maintain the original position. The liquid agent is discharged by switching the air switching pulp, which will be described later, to transfer compressed air from the air port 3a to the pipe line 2.
c, and pressurizes the pressurizing chambers 2d and 2ff. The air in the pressurizing chamber 2d operates the piston 4e, and the piston pushes down the spool 4fr, so that the liquid passage 1b and the liquid passage 4C are connected. The air arbitrarily controlled by the air needle valve 7 pressurizes the pressurizing chamber 2f, pushes down the liquid pump piston 5 at a predetermined speed, and the liquid flows from the pump chamber 1a to the liquid passage 1b, the pipe line 4c and By passing through the nozzle conduit 6af as indicated by the arrow 10b, the liquid agent is discharged in a fixed amount and at a constant flow rate, as shown by the arrow 10b. When the dispensing of the liquid agent is completed, a suitable period of time, i.e.
The air switching pulp is activated by a timer set for a short time so that the liquid does not harden, and the valve spool 4 is activated.
is pulled up, and at the same time as the spool 4 is switched, the liquid accumulated in the liquid passage 1c in the pulp body main body 1 is drawn in by the liquid drawing stroke, and before the liquid hanging at the tip of the nozzle 6 is hardened, It is drawn into the nozzle pipe 6a and waits for the next cycle. At this time, the spool operating stroke is performed by an adjustment nut 9 set on the top of the spool 4. Next, the air branched from the air pipe line 2a pressurizes the pressurizing chamber 2ei, and as the pump piston 5 rises, the liquid agent is again sealed in the pump chamber 1a, and the only air in the pressurizing chamber 2f is the check valve 8f: is released into the atmosphere through
The cycle is complete. Note that if the liquid is stopped for a long time, the liquid will come into contact with the atmosphere inside the nozzle pipe 6a, causing partial hardening, but when restarting, the liquid drawing action will reverse and the liquid drawing stroke will be reduced. It acts as an air booster and blows out the hardened area under high pressure. Therefore, even after being stopped for a long time, smooth quantitative and constant flow rate discharge effects can be obtained.

Is Figure 6 an example of using the constant discharge pulp shown in Figure 1? This figure shows an example of applying a liquid gasket to the adhesive surface of an oil pan.

In FIG. 3, reference numeral 11 denotes a liquid gasket pressure pump, which is driven by an air plunger pump 12 on the downstream side 1 to pump the internal liquid casket 15 into pulps 14 and 15.
The constant discharge valve 1 of the present invention is passed through the first hose 16 and the steel pipe 17 through the alternating action
Send to 9. The liquid gasket sent from the hose 18 in FIG. 5 corresponds to the liquid agent indicated by the arrow 10a in FIG. Further, 20 is an air switching pulp, and a compressed air source 21
The air sent to the constant discharge valve 19 is alternately switched. First, the air-cut valve 20 switches the air to the inlets 1d and 3a shown in FIG. Reference numeral 22 denotes an oil pan, which is supported by a jig (not shown) and is rotated in the direction of arrow 23 by a copying device, while being discharged from the nozzle 6 of the constant discharge valve 19 to apply the filtrate gasket to the adhesive surface 24. .

As described above, according to the present invention, the liquid agent in front of the pulp body is discharged at a constant flow rate by the differential piston housed in the pulp body, thereby improving product reliability and reducing costs. In other words, when continuously applying liquid gaskets to oil pans, etc., in order to link with a constant speed follow-up jig,
Fluctuations in the discharge volume and discharge flow rate are caused by a large amount of liquid, and the cost of the product increases. Therefore, by discharging in a stationary position and at a constant flow rate, product reliability can be improved and costs can be reduced. 1. The liquid in the nozzle is drawn in by the return stroke of the pulp spool built into the pulp body, so the liquid drains easily at the nozzle after being discharged, and the liquid does not drip.
The drooping is due to the curing of the liquid agent (all kinds of problems unlike in the past do not occur).

As shown in Fig. 6, if the constant discharge valve of the present invention is used for continuous application of liquid gasket to an oil pan, it will not be necessary to use the regirator, flow rate adjustment valve, and other accessories for interlocking the conventional application nozzle and follow-up jig. This eliminates the need for various devices for discharging the liquid gasket, and it also integrates the entire pulp and nozzle of the conventional secondary discharge pump, so the length of piping and pipe fittings between the liquid gasket pressure pump and the discharge nozzle can be reduced. Not only is the resistance in the pipe very small, but there is also less opportunity for air to be absorbed and the liquid gasket to harden. Stability is avoided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention, FIG. 2 is a bottom view of FIG. 1, and FIG. 3 is an explanatory diagram showing an example of the use of the constant discharge valve of FIG. 1. . 1・°°Pulp body main body, 1a...pump chamber, 1b
, 1c...Liquid passageway, 2...Pulp body intermediate member, 3...Pulp body top member, 4...Pulp spool, 4a, 4b, 4c, 4d-Liquid agent pipe line, 4
e - Piston, 5... Liquid pump pinuton, 6
... Nozzle, 6a... Nozzle conduit. Patent applicant: Toyota Motor Corporation

Claims (1)

[Claims] (1) A differential piston of a valve spool and a liquid pump piston that are built into the valve body so as to be able to reciprocate;
and a nozzle attached to the tip of the valve body,
The valve spool is formed between the valve spool, the liquid pump piston, and the valve body, and temporarily stores a certain amount of liquid from the liquid pipe line of the spool, and the liquid is stored by moving the pump piston to one side. The spool is provided with a pump chamber metal for pressurizing and heating the liquid, and the spool is provided with a liquid passageway between the pump chamber and the nozzle conduit of the nozzle by moving the spool to one side. . A constant discharge valve comprising: a conduit that completely closes the liquid agent passage by moving the spool to the other side and draws the liquid remaining in the nozzle into a housing.