JPS5938604B2 - Flow with check valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow regulating valve with a check valve that prevents jumping and shock and is capable of pressure compensation.

A conventional example of a flow rate regulating valve with a check valve is shown in FIG.

That is, a pressure compensation valve 126, a flow rate adjustment orifice 121, and a check valve 128 are built into the valve body 101, and the pressure compensation valve includes a pressure compensation valve body 102,
A spring 103 that presses the compensation valve body in the oil chamber 125, oil chambers 124 and 123, and pilot passages 120 and 1, respectively.
19 and communicates the primary port 110 with the oil passage 114; is inserted into the oil passage 114 and the oil passage 11 of the secondary port 111.
6, a sleeve 104 forming a control section 115 between the oil chamber on the adjusting screw 101 side of the orifice, and the spring 106.
The check valve includes a pilot hole 122 provided in the orifice so as to communicate with the oil chamber on the side, and a pilot passage 121 that communicates the oil chamber 125 with the oil chamber on the orifice adjusting screw 101 side. Road 11
6 and connected to the oil passage 117 of the primary port 110, the control portion 118 is formed in contact with the check valve body 108, and a spring 109 pressurizes the valve body. Therefore, first, in the case of a forward control flow in which pressure oil flows in from the primary port 110, when the pressure oil passes through the control section 113 of the pressure compensating valve 126,
The pressure is reduced so that the pressure difference before and after the control section 115 of the orifice 105 becomes a constant value, and the oil reaches the control section 115 via the oil path 114. The flow rate is adjusted by the controller and flows out to the secondary port 111.

The opening area of the control section 115 of the flow rate regulating orifice 127 can be changed by moving the adjusting screw 107 forward or backward,6 thereby making it possible to change the flow rate. The desired flow rate is obtained. In this case, the pressure oil that has flowed into the sixth oil passage 117 is caused by the check valve body 108 of the sixth check valve 128 being pressed against the spring 10.
Since the control unit 118 is closed by being compressed by port 9, the water does not flow into secondary port 111 of port 6. Next, in the case of free flow,
When pressure oil flows into the secondary port 111. Partial pressure oil is F
bI leg 115. It flows out to the primary port 110 via the oil passage 114 and the control section 113. Most of the time, the check valve is pushed against the spring 109 to open its control portion 118 and open the valve chamber 112. It flows out to the primary port 110 via the oil passage 117.

As mentioned above. The conventional flow regulating valve with check valve is. Since the pressure compensation valve, flow rate control orifice, and check valve are housed separately in one valve body, the external shape and weight become large, and the passage that connects the independent functional parts of the husband and wife becomes long. Because the response surname is slowed down? μru.

Also, adjusting the initial opening of the pressure compensation valve will help prevent the jamping phenomenon. This alone is not a complete countermeasure, and adjustments are required each time the inlet and outlet pressures of the valve change.6Furthermore, if the electromagnetic switching valve is switched to supply pressure oil to the actuator, a shock will occur and the problem will occur. There are many inconveniences and disadvantages in constructing a hydraulic circuit as an integrated valve. This invention was made to eliminate the drawbacks of the conventional ones. The object of the present invention is to provide a flow rate regulating valve with a check valve that not only achieves a smaller and lighter valve suitable for an integrated valve and simplifies the passage within the valve, but also prevents jamping and shock.

In other words, the flow rate regulating valve with check valve of the present invention is. The base of the flow rate adjusting throttle is formed in a large diameter part, and the head is formed in a small diameter part, and a broken poppet having a side hole on the outer periphery of the small diameter part is biased toward the tip of the head by a poppet spring to insert the valve. 6. The throttle is slidably disposed within the valve hole so that the poppet is seated on a seat portion halfway through a valve hole formed in a straight line in the valve body, and the valve hole at the back of the throttle is closed. A throttle spring chamber is provided in the throttle spring chamber, and a throttle spring that biases the throttle toward the distal end is provided in the throttle spring chamber.The end of the throttle head presses the side hole within the poppet to prevent the throttle from moving toward the distal end by the throttle spring. A stepped portion is provided on the inner wall of the valve hole to contact the shoulder surface of the large diameter portion of the poppet so as to restrict the valve to the closed position. What about the throttle? an adjusting screw for regulating the retracted position and setting the opening between the tip of the throttle head and the poppet side hole is disposed in the throttle spring chamber so as to be adjustable from the outside so as to come into contact with the end face of the back of the throttle; The inside of the valve hole on the side of the poppet side hole with the seat portion as a boundary is communicated with the primary port, while the seat opening in the valve hole on the opposite side is communicated with the secondary port via the pressure compensation control port, and A throttle passage is bored in the throttle to communicate the throttle spring chamber with the inside of the seat opening. A pressure compensating piston that faces the pressure compensating control port and controls the opening degree of the control port with its tip periphery is disposed coaxially with and opposite to the throttle; 6 further, the pressure compensating piston opens the opening degree of the control port A spring that elastically biases the valve in the direction is disposed in a spring chamber formed between the inner wall of the valve hole and the circumferential surface of the piston, and the spring chamber and the inside of the seat opening are connected to a passage bored in the piston. The pressure oil of the primary port is communicated with the tail end surface of the pressure compensating piston so as to oppose the spring.6 This achieves a compact and lightweight structure suitable for integrated valves and prevents jamping and shock. This has been achieved.

An embodiment of this invention will be explained with reference to the drawings. In FIG. 2, a flow rate adjusting throttle 2 and a pressure compensating piston 4 are built in facing each other on the axis of the valve hole in the valve body 1. The flow rate adjusting throttle 2 consists of a large diameter part A1 at the throttle base and a small diameter part A2 at the head, and has a throttle passage 19 having a throttle passing through both ends thereof.6 An annular poppet 3 is slid on the tip of the small diameter part. A poppet spring 20, which is movably inserted and disposed between the large-diameter portion, is pressed in the distal direction, and a throttle adjustment screw head 24 is screwed between the rear end face of the large-diameter portion and the valve body. A throttle spring 11 is elastically installed between the valve holes to form a throttle spring chamber 21 in the valve hole of this portion, and a throttle adjustment screw 22 that can freely move forward and backward is inserted into the adjustment screw base.

The shoulder surface of the large-diameter portion A1 of the throttle 2 abuts against a stepped portion in the valve hole, so that the limit position of movement in the distal direction is regulated to the state shown in FIG. 2. A poppet oil chamber 13 communicating with the primary port 9 is also formed in the valve hole around the poppet, and a side hole 5 communicating with the oil chamber 13 is bored in the side of the poppet 3. A flow rate adjusting throttle section is formed between the end 6 of the throttle 2 and the oil chamber 13 is communicated with a piston oil chamber 14, which will be described later, through this throttle section. The pressure compensating piston 4 is arranged so that its end on the flow rate adjusting throttle side can approach and leave the piston oil chamber 14, and the pressure compensating piston 4 has an opening at the boundary with another piston oil chamber 23 that communicates with the secondary port 10 in the valve hole. A pressure compensation control port 8 is formed on the edge, and the opening degree of the control port 8 is controlled by the piston bottom edge 7. Further, the other end of the piston 4 having an enlarged diameter is pressed downward in the drawing by a pressure compensating piston spring 12, and the spring chamber 15 and the piston oil chamber 14 are connected to each other by a passage 16 bored in the pressure compensating piston. The piston stopper screwed into the valve body 1 is connected to the spring chamber 21 in the valve hole and the piston back chamber 17 on the opposite side through the passage 18 from the primary port 9. Therefore, according to the configuration of this embodiment, pressure oil is brought into contact with the primary port 9.
When the 5-pressure oil flows into the secondary port 10 from the poppet oil chamber 13, it acts on the (A1-A2) cross-sectional area difference of the throttle 2 and pushes the throttle 2 up to the position determined by the throttle adjustment screw 22. However, at that position, the pressure oil flows into the piston oil chamber 14 and other piston oil chambers 23 through the throttle part formed by the poppet side hole 5 and the throttle tip 6, and then flows out from the secondary port 10. The pressure in the back chamber 17 at this time is the pressure in the poppet oil chamber 13 acting on the pressure compensating piston 4 via the primary port 9 and the passage 18, and the pressure in the piston oil chamber 14.
The pressure is transmitted to the pressure compensating piston spring chamber 15 through the piston passage 16 and acts on the piston together with the spring force of the pressure compensating piston spring 12 to balance the pressure in the piston back chamber, thereby controlling the pressure compensating control port. The opening degree of the pressure control section consisting of the piston bottom edge 7 and the piston bottom edge 7 is adjusted 5, so that the pressure difference before and after the flow rate adjustment throttle section is kept at a constant value determined by the spring force of the piston spring 12 and the cross-sectional area of the pressure compensating piston 6. Even if the pressure difference between the primary port 9 and the secondary port 10 changes, pressure compensation is performed so that the adjusted flow rate does not change. The flow rate adjustment throttle 2 is pressed against the tip of the throttle adjustment screw 22 by the pressure oil in the poppet oil chamber 13. When the adjusting screw is moved back and forth to move the position of the throttle, the opening area of the flow rate adjusting throttle section changes, so the adjusted flow rate can be changed.
In addition, when the pressure oil is not acting, the throttle 6 is pressed downward in FIG. The provision of the throttle allows the throttle to open slowly to prevent jamping and shock.

On the other hand, in the case of free flow, the pressure oil flowing in from the 6 secondary ports 10 acts on the poppet 3 through the 6 piston oil chambers 23 and 14, and the poppet 3 is pushed open against the poppet spring 20 and the piston Pressure oil in the oil chamber 14 flows out to the primary port 9 through the poppet oil chamber 13 at a low pressure. As mentioned above, this invention has a flow rate adjustment throttle and a pressure compensating piston arranged side by side on the axis of the valve body, thereby allowing flow rate adjustment with pressure compensation and check valve operation to be performed, thereby making it possible to reduce the size and simplify the configuration. By providing a throttle passage through the flow rate adjusting throttle, jamping and shock can be prevented, which is of great practical benefit.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional side view of a conventional flow control valve with a check valve. FIG. 2 is a longitudinal sectional side view of an embodiment of the invention. 2...Flow rate adjustment throttle 3...Poppet, 4...Pressure compensating piston 69...
...Primary port, 10...--Secondary port. 11・
... Throttle spring, 12 ... Piston spring 613 ... Poppet oil chamber, 14 ...
・Piston oil chamber, 15...Piston spring chamber, 1
6... Piston passage, 17... Piston back chamber, 18-... Passage. 19... Throttle passage, 20... Poppet spring, 21...
... Throttle spring chamber, 22... Throttle adjustment screw, 23... Piston oil chamber.

Claims (1)

[Claims] 1 Consists of a large diameter part and a small diameter part in which an annular poppet, which is pressed in the distal direction by a poppet spring, is slidably inserted into the outer periphery of the tip, and passes through both diameter parts to form an axial throttle passage on both end surfaces. A flow rate adjustment throttle drilled in between is built into the valve hole in the valve body so as to be able to slide in the axial direction, and the retraction limit position can be adjusted with an adjustment screw that can come into contact with the tail end surface of the large diameter part. A spring chamber is formed in the valve hole in the tail end surface of the large diameter portion, a throttle spring is used to elastically bias the throttle, and a poppet oil chamber communicating with the primary port is formed around the poppet to form a flow rate adjustment portion. A piston oil chamber is formed between the tip of the poppet and the piston oil chamber that communicates with the poppet oil chamber when the poppet opens against the poppet spring, and a back chamber that communicates with the primary port is formed in the valve hole. A pressure compensating piston is provided at an end opposite to the spring chamber, and a pressure compensating piston is slidably disposed in a valve hole between the back chamber and the piston oil chamber, and a pressure compensating piston is disposed in a separate spring chamber in the valve body. The piston spring resiliently urges the piston against the primary pressure of the back chamber, and communicates the other spring chamber with the piston oil chamber through a passage in the pressure compensating piston. A flow rate regulating valve with a check valve, characterized in that a pressure control section whose opening degree is controlled at the tip of the piston is configured between the piston oil chamber and another piston oil chamber communicating with the secondary port.