JPS6221828Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the structure of a spring pressure-feeding intermittent metering discharge valve.

Intermittent metering discharge valves are incorporated into various lubricating oil supply systems, and these can be broadly divided into so-called "first-out type" and "later-out type" types. The "first-out system" is, for example,
As shown in Nos. 9511 and 38-20769,
a cylinder chamber having an inlet connected to the primary side piping extending from the pump device and an outlet connected to the refueling point side; and a cylinder chamber arranged coaxially between the inlet and the outlet of the cylinder chamber. a hollow guide shaft, a piston slidably disposed in the cylinder along the guide shaft, and a spring biasing the piston toward the inlet port;
According to this device, the pump device is operated intermittently, and the pump device includes a valve body disposed between the guide shaft and the inlet and opened and closed by the supply pressure in the primary side piping. The oil pumped through the side pipe opens the valve body (at this time, the guide shaft is closed by the valve body), flows into the cylinder chamber, and moves the piston backward against the biasing force of the spring. It is filled into a measuring chamber formed on this side. Then, when the pump operation is cut off and the pressure in the primary piping is depressurized, the piston is pushed back by the spring, and the pressure moves the valve body to close the inlet, while the guide shaft is closed. It is opened. Therefore, the oil in the metering chamber is transferred through the guide shaft to the rear chamber of the cylinder formed behind the piston. The oil thus transferred into the rear chamber is forced to the outlet side by the piston which is retracted as described above in accordance with the supply pressure during the next pump operation. As is clear from the above, in this "first-out system," the discharge pressure is uniformly determined by the supply pressure of the primary piping, so in particular, oil is supplied at different pressures to multiple oiling points. The disadvantage was that it could not be supplied. On the other hand, an intermittent metering discharge valve called a "post-discharge method" has an oil storage cylinder with a built-in spring-biased piston, and this oil storage cylinder is connected to the primary piping and the secondary piping. It is connected to the pipes through an umbrella valve that opens and closes depending on the pressure difference within the pipes.
Therefore, according to this discharge valve, a certain amount of oil is accumulated in the oil storage cylinder when the pump is operated, but this accumulated oil is not used in the above-mentioned "first-out method".
However, when the pump stops operating and the primary piping is depressurized, the spring pressure that biases the piston is used to send pressure into the secondary piping. By making an appropriate selection, oil can be supplied to a predetermined oil supply point at an appropriate pressure. However, in the previous example, a branch path was provided for the oil supply path including the primary side piping and the secondary side piping, and the oil storage cylinder was passed through the branch path, which resulted in miniaturization. There is a limit in the upper part, and it may not be possible to install it in a very narrow space.

Therefore, the purpose of this invention is to arrange a metering chamber (oil storage chamber) and a piston coaxially with respect to the inlet on the primary side and the outlet on the secondary side, and to achieve a compact structure. An object of the present invention is to provide an intermittent metering discharge valve using a "post-discharge method".

A specific example illustrating the structure of this invention will be described below.

Please pay attention to the first embodiment shown in Figures 1 to 4. This embodiment is an integral construction of three discharge valves of the present invention. As is clear from the cut-out portion, the base body 1 has the following components:
A hole having an inlet 14 is provided at the bottom, and an obturator 2, which also serves as a pipe connector, is screwed into the opening of the hole to form a piston chamber. A cylindrical guide shaft 4, one end of which is held by the core of the obturator 2 and the other end of which reaches the inside of the inlet 14, is supported by a stop ring 7 in the piston chamber. A free piston 3, which has an axial hole that fits the guide shaft 4 and is formed to fit into the peripheral wall of the piston chamber, is also provided in the piston chamber in a predetermined state, forming a valve chamber 13 on the inlet side of the free piston and a vacant chamber 13a on the outlet side. The valve chamber 13 has a function of temporarily holding and accumulating the pressurized fluid that is supplied and flows in, and a coil spring 8 is installed in one vacant chamber 13a, and a through hole 17 is provided as a venting means to accommodate the volume change of the vacant chamber that occurs during operation. Seal materials 12 and 18 are pressed around the free piston 3 and into the axial hole to prevent the fluid held in the valve chamber 13 from flowing out toward the vacant chamber 13a.
indicates a washer which acts as a retainer for the sealing material 18 or as a washer for the coil spring 8 described later. Similar to the washer 9, a washer 11 is provided on the outlet side of the guide shaft 4 to support the sealing material 10 pressed around the guide shaft 4. As will be understood already, between the free piston 3 and the obturator 2, i.e., in the empty chamber 13a, a spiral coil spring 8 is inserted around the guide shaft 4 with the washers 9, 11 provided on the sides of both components as their respective bearing surfaces, and its elasticity is imparted to the free piston 3.

The inlet side of the guide shaft 4 in the above structure is provided with an elastic umbrella-shaped valve 5 that can close the opening of the guiding hole 16, and the valve 5 is connected to the opening of the guiding hole 16. A coil spring 6 is provided in the direction of pressure contact, and the guide hole, the valve chamber 13 and the inlet port 1 are provided.
The passages between the passages 4 and 4 are opened and closed in opposite states as the fluid pressure acting thereon changes.

In the above structure, the guiding hole 1 is provided in the core of the guide shaft 4.
6, and one opening of the guide hole 16 is connected to the valve chamber 1.
It should be noted that the valve chamber 13 opens into the valve chamber 3 and the other end is connected to the outlet 15, so that the valve chamber 13 and the outlet 15 can be directly connected.

Below, in order to further clarify the principle of this invention, based on another specific example shown in Figures 5 to 8,
Portions that differ from the configuration of the specific example described above will be explained. The base body 21 of this example has a shape suitable for use in conjunction with a joint such as a distributor,
One discharge valve is configured on one base. In the internal structure, the free piston is formed by a combination of a piston member 3b and a sealing material 19 of a special shape, for example, called a lip packing, which is fitted on the inflow side of the piston member 3b, and effectively seals around the piston and the shaft hole. I have to. 20 in the figure is
It is a pivot member for supporting the guide shaft 4 for the same purpose as the stop ring in the specific example, and is provided with a guide hole 22 that communicates between the inlet side and the valve chamber side.

It goes without saying that the common symbols in the two types of specific examples described above indicate common parts or common parts, but by clearly indicating the common points, the principle of this invention can be fully understood. With this in mind, the operation will be explained below based on FIGS. 6 to 8.

FIG. 6 shows the discharge valve of this invention in a stationary state. Now, when pressurized fluid flows in from the inlet 14, the edge of the umbrella-shaped valve 5 is contracted inward by the fluid pressure as shown in Figure 7, and the fluid enters the valve chamber through the gap. Inflow towards. In this case, since the opening of the guide hole 16 provided in the core of the guide shaft 4 is closed by the upper surface of the valve element 5,
The inflowing fluid is stored in the valve chamber 13 while pushing up the free piston 3 against the elasticity of the coil spring 8 due to its pressure, and eventually pushes the free piston 3 to the upper limit of operation as shown in FIG. 7. and stop.

At that point, the fluid supply action is stopped and the pressure on the supply side (main pipe) is depressurized (significantly reduced).
Then, the fluid accumulated and pressured in the valve chamber 13 uses pressure to push the valve element 5 back toward the inlet 14 to the state shown in FIG. 8, and closes the space between the inlet and the valve chamber 13 In addition, a gap is provided between the end surface of the guide shaft 4 and the upper surface of the valve element 5 so that the guide hole 16 and the valve chamber 13 are electrically connected to each other. Therefore, the fluid is forced toward the outlet 15 through the guide hole 16 by the pressure of the coil spring 8 .

Note that due to the structure of this invention, the inlet 14 and the valve chamber 13
It goes without saying that the valve that opens and closes the fluid passage between the valve chamber and the outlet 15 can be constructed without being limited to using the umbrella-shaped valve shown in the specific example, and such differences in structure , should be understood as a natural variation of this idea.

As is clear from the description of each example above,
This invention includes a piston chamber having an inlet 14 and an outlet 15 coaxially formed in each of the opposing end walls, and a guide hole 16 disposed between the inlet 14 and the outlet 15. a cylindrical guide shaft 4, and a piston constituting a valve chamber 13 that is slidably provided in the piston chamber using the guide shaft 4 as a guide and that is capable of metering fluid on the inflow side of the piston chamber. 3, and the piston 3 is connected to the inlet port 1.
A spring member 8 is disposed at the inflow side end of the guide shaft 4 to bias the valve chamber 13 toward the guide shaft 4 in response to changes in the pressure of the fluid supplied from the inlet. an on-off valve 5 that selectively communicates with either the inlet 16 or the inlet 14;
The fluid is filled into the valve chamber 13 while moving the piston 3 by the supply pressure from the inlet port 14, and when the supply pressure is released, the spring member 8 is applied via the piston 3.
This is an intermittent discharge valve using a "post-discharge method" characterized in that the pressure is forced from the inside of the valve chamber 13 through the guide hole 16 of the guide shaft 4 to the outlet 15 side. By arranging the valve chamber 13 and the piston 3 coaxially with respect to the inlet 14 and the outlet 15, the overall shape can be made smaller, and when attached to various mechanical devices. , which has the advantage of requiring only a small installation space. In addition, the structure of this invention is extremely simple and can be manufactured at a much lower cost than conventional discharge valves with similar functions.
Extremely practical.

[Brief explanation of the drawing]

Figure 1 is a front view of one specific example, Figure 2 is a partially cut-away plan view of the same, Figure 3 is a side view of the same, Figure 4 is a stopper used in the same example, and Figure 5 is a different one. FIG. 6 is an enlarged longitudinal section showing the internal structure of the specific example, FIG. 7 is a structural diagram similar to FIG. 6, and is an operational diagram showing the process of supplying fluid. FIG. 8 is an operation diagram showing the discharge process, similar to FIG. 7. In the figure, 1 is the base, 2 is an obturator that also serves as a pipe connector,
3 is a free piston, 4 is a guide having a guide hole,
5 is a valve element of the on-off valve; 6 is a coil spring biased by the valve element; 7 is a stop ring that supports the guide shaft;
8 is a coil spring that provides a pressure accumulation effect, 9 is a washer, 10 is a sealing material, 11 is a washer that also serves as a spring seat, 12 is a sealing material pushed around the free piston, 13 is a valve chamber, 13a is an empty chamber, 14
15 is an inlet, 15 is an outlet, 16 is a guide hole provided in the guide shaft, 17 is a through hole, 18 is a sealing material inserted between the free piston and the guide shaft, and the fifth
In the specific example shown in FIGS. 8 to 8, 3b is a piston member, 19 is a seal member, 20 is a pivot member, 21 is a base, and 22 is a guide hole communicating with both sides of the pivot member.

Claims (1)

[Claims for Utility Model Registration] A piston chamber having an inlet 14 and an outlet 15 coaxially formed in each of opposing end walls;
A cylindrical guide shaft 4 having a guide hole 16 disposed between the inflow port 14 and the outflow port 15; and a cylindrical guide shaft 4 provided slidably within the piston chamber using the guide shaft 4 as a guide; A piston 3 having a valve chamber 13 capable of measuring fluid on the inflow side thereof and having a variable volume cavity 13a on the back side thereof, and a piston 3 disposed within the cavity 13a to allow the piston 3 to be A spring member 8 biasing toward the inflow port 14 is disposed at the inflow side end of the guide shaft 4, and the spring member 8 biases the valve chamber 13 toward the inflow port 14 according to pressure changes of the fluid supplied from the inflow port 14. It includes an on-off valve 5 that selectively communicates with either the guide hole 16 of the guide shaft 4 or the inlet 14, and the fluid is supplied from the inlet 14 while moving the piston 3 by its supply pressure. The valve chamber 13 is filled, and when the supply pressure is released, the pressure of the spring member 8 applied via the piston 3 causes the air to flow from the inside of the empty valve 13 through the guide hole 16 of the guide shaft 14. The structure of the spring pressure-fed intermittent metering discharge valve is characterized in that the discharge valve is directly pressure-fed to the outlet 15 side.