JPS62188879A - Remote control type poppet valve - Google Patents

Abstract

PURPOSE:To prevent the outflow of pilot oil to a main oil passage by forcing pilot oil inside a back pressure chamber to flow out, through a hollow part in an input rod, from a pilot oil discharging port provided separately from a main passage. CONSTITUTION:A poppet 21 controls opening of a main passage and a passage 30a is formed inside a hollow input rod 30 and an orifice 31 is formed. When a control rod 32 is displaced, pilot oil is discharged, through an inside passage 30a, from a back pressure chamber 24 and the poppet 21 follows rapidly. Consequently, pilot oil flowing into the back pressure chamber 24 is made to flow out from a pilot oil discharging port 34. For this reason, there is never such a case where the pilot oil flows out into the main passage in a moment at the time of opening the valve causes a cylinder positioned on its downstream to move instantly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remotely operated poppet valve that moves the poppet position of the poppet valve following an input member.

[Conventional technology]

Conventionally, there has been one poppet valve of this type, such as the one shown in FIG.

To briefly explain 29, valve body 1 has poppets 1 to 2.
is stored in the poppet 2 and urged in the valve closing direction by a spring B, and a passage having an orifice 4 is provided in the poppet 2 so as to communicate between the input port 5 and the back pressure chamber 6. A passageway with a conical opening 8 communicating between the pressure chamber 6 and the outlet port 7 is provided.

This poppet 2 forms an orifice 11 at the tip of the input rod 10 and follows the input rod 10. That is, when the input rod 10 is pushed to the right in the figure, the orifice 11 is closed and the back is closed. Increase the pressure in pressure chamber 6, and poppet 2
As shown in the figure, the right edge is in close contact with the seat portion 12 to close the flow path between the inlet port 5 and the outlet port 7.

When the input rod 10 is moved to the left, the poppet 2 follows and moves to the left, separating from the seat portion 12 and opening the flow path.

[Problem that the invention seeks to solve]

However, in such conventional remote-operated poppet valves, the operating rod was simply rod-shaped and protruded outward from the back pressure chamber, so the pressure at the outlet port acted on the cross-sectional area of the operating rod. . Therefore, in order to drive the input rod at an extremely high speed and cause the poppet to follow it, a large operating force is required, making it unsuitable for high-speed driving.

Furthermore, even if the flow path between the inlet port and the outlet port is opened at high speed, pilot oil will momentarily flow out from the back pressure chamber to the outlet port, and this will be added to the original flow. Therefore, there was a problem that the cylinders located downstream from the outlet port 1 were moved by -v#.

Furthermore, even when the poppet is fully open, orifice 1
If there is a leak in 1, this will directly appear at the outlet port, and since the poppet is controlled only by the operating rod, there is a problem that if it becomes inoperable due to some kind of trouble, emergency operation cannot be performed. There was also.

This invention aims to solve these various problems.

[Means for solving problems]

Therefore, the remotely operated poppet valve according to the present invention has a poppet that opens and closes the main flow path slidably housed within the valve body, and inlet port pressure of the main flow path is applied to one surface of the poppet.

In a poppet valve that drives the poppet by controlling the pressure in a back pressure chamber whose other surface is exposed, a hollow input that projects into the back pressure chamber and moves toward and away from the poppet or moves in and out of the poppet to position the poppet in a follow-up manner. A rod is slidably provided in the valve body, and the back pressure chamber is communicated with the pilot oil discharge port through the hollow part of the input rod, and the pilot oil discharge port is connected to the return line during control. , a switching valve that is closed when not controlled or connected to a hydraulic power source.

[For production]

During control, when the input rod is displaced away from the poppet, the pilot oil in the back pressure chamber passes through the hollow part of the input rod and is instantly discharged from the pilot oil discharge port to the tank, so that the poppet moves away from the input rod. The main flow path opens quickly following the displacement.

Furthermore, since the input rod is formed in a hollow shape, the pressure-receiving area is small, so it can be operated with a small force, and high-speed driving is possible.

Further, since the pilot oil in the back pressure chamber flows out through the hollow part of the input rod to the pilot oil discharge port separate from the main flow path, the controlled flow rate does not appear at the outlet port of the main flow path.

In addition, when the control is not performed, if the discharge port is closed by the switching valve or communicated with the hydraulic pressure source, the hydraulic pressure in the back pressure chamber increases, and the poppet moves regardless of the position of the input lot to close the main flow path.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Satoko Arrival Team FIG. 1 is a sectional view showing a first embodiment of the invention.

In this embodiment, the poppet 21 that is slidably housed within the valve body 20 is a poppet having a substantially equal area, and the opening of the main flow path between the inlet port 22 and the outlet port 23 is defined by the tip edge of the poppet 21. is controlled by a gap formed between the valve body 20 and the conical surface 20a forming the valve seat.

This poppet 21 is biased by a spring 25 provided in the back pressure chamber 24 in a direction to close the opening of the flow path.

Then, the pressure of the inlet port 22 is applied to one end surface 21a (the end surface on the right side in the figure) of the poppet 21, and the orifice 26 is inserted from the inlet port 22 into the back pressure chamber 24 to which the other end surface 21b is exposed. A passage 27 through which pilot oil flows is formed in the valve body 20.

Furthermore, this poppet 21 is provided with a large diameter part 21c (diameter D3) on the back pressure chamber 24 side, and a small diameter part 21d is provided between this and the main diameter part (diameter D1) to connect it to the valve body 20. An oil chamber 28 is formed between them. Then, the end surface 21 of the large diameter portion 21e
A center hole 216 having a conical opening 21f that opens into the back pressure chamber 24 is bored along the central axis from b to the small diameter portion 2.
This center hole 21.1d. A radial passage hole 21g that communicates between the oil chamber 28 and the oil chamber 28 is formed.

On the other hand, the input cullot 30 is hollow and has a passage 30a formed therein, and is slidably inserted into a sliding hole 20b formed in the valve body 20, and its tip is inserted into the back pressure chamber 24. Projecting out is the conical opening 2 in the end face 21b of the poppet 21.
1f, and an orifice 31 is formed between them.

Further, a valve body 20 is provided at the rear end of this input lot 30.
A small-diameter operating rod 32 protruding from the input rod 30 is integrally fixed with the input rod 30, as shown in FIG. An oil chamber 33 is formed between the end of the input rod 30 on the operating rod 32 side and the valve body 20, and the oil chamber 33 is communicated with a pilot oil discharge port 34.

In addition, the input lot 30 has a large diameter portion 30d (
A diameter Do) is provided, and an oil chamber 37 formed by a diameter difference between the large diameter portion 30d and the main diameter portion (D2) is communicated with the tank 35 through a tank port 38.

Furthermore, a pair of notches are provided on both sides of the operating rod 32 along the axial direction from the rear end surface (left end surface in FIG. 1) of the input rod 30! job, 30b is provided to open the internal passageway 30. The pilot oil flowing into the back pressure chamber 24 is guided from the oil chamber 33 to the pilot oil discharge port (tank port) 34 through the forming orifice 31 and the internal passage 30a and cutout 30b of this input lot 30.

And this pilot oil drain port! +4 is connected to the return line to tank 3rd via solenoid valve 3rd, which is a 2nd place switching valve.

The operating principle of this embodiment is similar to that of the conventional example shown in FIG. Since a large amount of pressure oil in the back pressure chamber 24 can be discharged instantaneously through the poppet 21, it is possible to make the poppet 21 follow the displacement of the input rod 30 at high speed.

By the way, the difference in pressure receiving area between the large diameter portion 21C (diameter D3) and the main diameter portion (diameter DI) of the poppet 21 is (π/4)・(D3”
DI”) is the area (π
/4) D2''.

Therefore, when the orifice 31 is fully closed, the poppet 2
1, the pressure applied to the end surface 21a and the pressure in the opposite direction applied to the end surface 21b are balanced, and the closing force of the spring 25 causes the conical surface 20.1 of the valve body 20 to close. Close to.

On the other hand, the input rod 30 is not affected by the pressure inside the back pressure chamber 24, and only the operating rod 32 protrudes to the outside, and its diameter (D5) is small, and the force acting on it is generally Since it is essentially the pilot oil discharge port (tank port) pressure, its ejection force is extremely small.

Therefore, when the operating rod 32 is displaced to the left in FIG. ．． Since a large amount of pilot oil is discharged from the back pressure chamber 24 through the
1 follows.

In addition, the solenoid valve 36 is normally switched so that the pilot oil discharge port 34 is communicated with the tank 3S, and in a steady state, the back pressure chamber 24 is connected through the orifice 26.
A small amount of the pilot flow flowing into the inlet port 22 flows out from the pilot oil discharge port 34, but in an emergency operation, if the solenoid valve 36 is switched to the blocked state shown, the pilot flow flowing from the inlet port 22 through the orifice 26 The oil reduces the hydraulic pressure in the back pressure chamber 24,
The poppet 21 can be moved to the right end regardless of the state of the input lot 30.

However, at this time, due to the pressure increase in the oil chamber 33, a pushing force applied to the operating rod 32 (diameter Ds) to the left acts on the operating rod 32 due to a pressing force corresponding to the cross-sectional area of the operating rod 32 (diameter Ds). Therefore, the relationship between the diameter D6 of the large diameter portion 30d of the input lot 30, the diameter D2 of the main diameter portion, and the diameter D5 of the operating rod 32 is expressed as (π/4)・(Ds ”−02”)=(π/4)D
s'', balance is achieved by generating a pressing force that cancels out this ejection force.

FIG. 3 shows a second embodiment of the present invention, and parts corresponding to those in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted.

The poppet 51 in this embodiment controls the opening of the flow path between the inlet port 1-52 and the outlet port 53 by the cut S1a formed in the cylindrical portion at the tip. This is the opposite of the embodiment shown in FIG.

This poppet 51 differs from the poppet 21 in FIG. 1 in that it has only a large diameter portion 51C.

Further, pilot oil is caused to flow into the back pressure chamber 24 from the inlet port 52 through a passage 54 having an orifice 26 formed in the valve body 20.

Furthermore, an oil seal 61 is provided between the valve body 20 and the operating rod 32, so that the operating rod 32 can be operated with high precision by a proportional solenoid 60 with a position sensor.

Further, when there is a pressure difference between the inlet port 52 and the outlet port S'z1, the closing force that constantly acts on the poppet 51 is utilized to create a structure that does not require a spring. Further, even if there is no pressure difference between them, the operation rod 32 can be closed by pushing it in because the forces in the left and right directions are balanced as described above.

FIG. 4 shows a third embodiment of the present invention, and parts corresponding to those in FIG.

This embodiment differs from the first embodiment shown in FIG. 1 by using a poppet 81 that eliminates the passage hole 21g, eliminates the spring 25, and communicates the oil chamber 28 with the tank 35 through a passage 82, and The oil discharge port 54 can be switchably connected to a hydraulic power source 86 and a tank 87 via a solenoid valve 85 which is a three-position switching valve.

Normally, the solenoid valve 85 is switched so that the pilot oil discharge port 34 communicates with the tank 87.
In a steady state, a small amount of pilot flow flows into the back pressure chamber 24 through the orifice 2 through the pilot oil discharge port 3.
However, in the event of an emergency operation, the solenoid valve 85 should be set to the blocked state as shown in the figure (in that case, the same as in the first embodiment), or the pilot oil discharge port 34 should be switched to be connected to the hydraulic source 86. Accordingly, the oil chamber 33 and the internal passage 30 of the input lot 30. through the back pressure chamber 24
When high pressure is applied to the input wood! The poppet 81 can be moved to the fully closed position at the right end regardless of the state of the poppet 10.

■'' (Document cylinder) Figure 5 shows the fourth embodiment of this invention, and Figures 1 and 3
The same reference numerals are given to the parts corresponding to those in the figure and FIG. 4, and the explanation thereof will be omitted.

This example is an operation wood! This is a case where the follow-up positioning method for +2 and poppet S1 is a spool-sleeve method.

A bottomed hole 9 opened in the direction of the central axis inside the poppet S1
1a, and circumferential grooves 91 bt and 91 b2 communicating with the flow path 92 and the flow path 93 are provided on the peripheral wall of this hole, and the flow path S2
The flow path 93 is opened to the inlet port 22 and the back pressure chamber 24, respectively.

In addition, in the bottomed hole 918 of the poppet 91, a pilot spool is provided as an input wood with a hollow oil passage 90c provided with a land portion 90a shown in FIG. 90 is slidably fitted, and by moving this in the central axis direction, the flow path S2 and the flow path S3 are communicated or closed, and the amount of pilot oil supplied to the back pressure chamber 24 is adjusted. is controlled to position the poppet 91.

Note that the land portion 90. Considering leakage during positioning and vibration during switching between opening and closing, the dimensional relationship of Ll is determined as shown in FIG. 6, and it is preferable to set it as L2.

According to this embodiment, the poppet 91 for the operating rod
The follow-up action is fast both when opening and closing, and when pressure oil is supplied from the pilot oil discharge port 34, closing can be ensured.

Fig. 7 shows the fifth embodiment of this invention, and Fig. 1 and Fig. 5
Portions corresponding to those in the figures are given the same reference numerals, and their explanations will be omitted.

In this embodiment, instead of the pilot spool SO of the fourth embodiment, a pilot spool 100 having a triangular notch groove 103 on the land edge as shown in FIG. 8 is used as an input lot, and the input lot is similar to that in FIG. A passage 27 is provided to communicate the port 22 and the back pressure chamber 24.

The follow-up position control in a stationary steady state is controlled by the flow of pilot oil flowing into the back pressure chamber 24 from the inlet port via the orifice 26, as in the embodiments of FIGS. 1 and 3. However, when the operating rod 32 is moved with a large stroke in the closing direction during closing control, the flow path S2
The flow path S3 communicates with the inlet port 22, and the inlet pressure on the inlet port 22 side acts on the back pressure chamber 24, enabling high-speed closing.

Note that, according to this embodiment, the pilot spool 100
Since the flow path S2 is fully open when positioning the poppet S1, the dimensional relationship between Ll and Ll shown in FIG.
For example, if 1≧L2.

Even if this difference becomes large, there is no problem because the leakage is determined by the orifice. Further, even if this difference is too small, since the flow path S2 is structured not to open when the pilot spool 100 and the poppet S1 are positioned, no vibration will occur in this member.

〔Effect of the invention〕

As explained above, the remote-operated poppet valve according to the present invention allows the pilot oil in the back pressure chamber to flow out through the hollow part of the input rod to the pilot oil discharge port provided separately from the main flow path. This prevents the pilot oil from momentarily flowing out into the main flow path when the valve is opened and causing the cylinders, etc. located downstream thereof to move momentarily.

In addition, the input rod (pilot spool) has a structure that allows it to be operated with a small operating force, and a large amount of pressure oil in the back pressure chamber can flow out through the hollow part of the input rod, making high-speed driving possible.

Furthermore, the pilot oil discharge port is normally connected to the return line to the tank via a switching valve, and can be closed or connected to a hydraulic power source by switching the switching valve. Poppet valves can be closed at high speeds regardless of position. Therefore, highly reliable emergency operations are possible.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, FIG. 2 is a perspective view similarly seen from the rear end side of the operating rod, and FIG. 3 is a longitudinal sectional view showing a second embodiment of the invention. Surface diagram. FIG. 4 is a longitudinal sectional view showing a third embodiment of the invention. FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the invention. FIG. 6 is an enlarged sectional view of a main part showing the relationship between the land portion of the pilot spool and the circumferential groove of the poppet, and FIG. 7 is a longitudinal sectional view showing a fifth embodiment of the present invention. FIG. 8 is an enlarged cross-sectional view of the main part showing the relationship between the land portion of the pilot spool and the circular R groove of the poppet, and FIG. S is a vertical cross-sectional view illustrating a conventional remote-operated poppet valve. 20... Valve body 21.51, 81.91... Poppet 22.52...
・Inlet port 23.53...Outlet port 24...Back pressure chamber 25・
... Spring 26 ... Orifice 27.8
2... Passage 28.37... Oil chamber 30...
Inlet rod 3oa... Internal passage 31... Forming orifice 32... Operating rod 34... Pilot oil discharge port 36.85... Solenoid valve 39.87... Tank 60... With position sensor Proportional solenoid 86...hydraulic source

Claims (1)

[Claims] 1. A poppet for opening and closing a main flow path is slidably housed in a valve body, and the inlet port pressure of the main flow path is applied to one side of the poppet, while the other side is exposed. In the poppet valve that drives the poppet by controlling the pressure in the back pressure chamber, the valve body includes a hollow input rod that protrudes into the back pressure chamber and moves toward and away from the poppet, or moves in and out of the poppet to position the poppet. The back pressure chamber is slidably provided in the input rod, and the back pressure chamber is connected to the pilot oil discharge port through the hollow part of the input rod, and the pilot oil discharge port is connected to the return line during control, and is connected to the return line during non-control. A remotely operated poppet valve characterized by being provided with a switching valve that is closed or connected to a hydraulic power source. 2. The input rod has a large diameter part between the main diameter part and the operating rod, which is thicker than the diameter (D_2) of the main diameter part, and the diameter (D_6) of the large diameter part and the diameter (D_6) of the operating rod are D_5) The oil chamber formed by the difference in diameter between the large diameter part and the main diameter part is communicated with the pilot oil discharge port, and the oil chamber formed by the difference in diameter between the large diameter part and the main diameter part is communicated with the tank port. A remotely operated poppet valve according to claim 1.