CN202832578U - A large flow hydraulic control check valve - Google Patents

Abstract

The utility model discloses a large-traffic liquid accuse check valve, it includes the valve body, the valve barrel, the case, disk seat and ejector pin, be equipped with the sap cavity on the disk seat, the ejector pin is located the inside of disk seat, the position that is close to the sap cavity in the inside of disk seat still is equipped with the stopper, the head of ejector pin passes the stopper and stretches into the sap cavity of disk seat, be formed with the oil storage chamber between the tip inner wall of the tip of ejector pin and valve body, the case of placing in the valve barrel in is divided into big case and little case, big case overlaps the outside at little case, big case and disk seat sealing connection, the head of little case stretches out in the outside of big case, be equipped with the three working port that supplies the hydraulic oil business turn over on the valve body, one of them working port intercommunication oil storage chamber, the sap cavity of crossing of a working port intercommunication disk seat, the inlet. Compared with the prior art, the high-flow hydraulic control one-way valve has the advantages of simple structure, simple installation, convenient disassembly and maintenance, small hydraulic impact during unloading and long service life, and is provided with two valve cores.

Description

A large flow hydraulic control check valve

technical field

The utility model relates to a hydraulic component in a hydraulic circuit of a coal mine hydraulic support, in particular to a large-flow hydraulic control check valve.

Background technique

Since the beginning of fully mechanized mining in coal mines, due to the different coal mining environments, there have been stricter requirements on hydraulic supports and supporting equipment. The large flow hydraulic control check valve currently used has a small flow rate and a large hydraulic shock during unloading, which will reduce the service life of each component and the overall life of the valve. Moreover, the hydraulic control check valve is composed of many structural parts, and the replacement of the seals requires It is extremely inconvenient downhole to disassemble many parts, and many problems plague the normal work and production of the downhole hydraulic support.

Utility model content

The technical problem to be solved by the utility model is to provide a large-flow hydraulic control one-way valve with small hydraulic impact during unloading, long service life and convenient installation and maintenance.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a large-flow hydraulic control check valve, which includes a valve body, a valve sleeve, a valve core, a valve seat and a push rod, and the valve seat is provided with a liquid outlet valve. cavity, the ejector rod is located inside the valve seat, and a limit block is provided inside the valve seat close to the liquid passage chamber. The head of the ejector rod extends into the liquid passage chamber of the valve seat through the limit block. There is also a return spring in the middle of the valve body. One end of the return spring is against the limit block, and the other end is against the protrusion provided on the rod body of the ejector rod. Between the end of the ejector rod and the inner wall of the end of the valve body An oil storage chamber is formed. The spool built in the valve sleeve is divided into a large spool and a small spool. The large spool is placed outside the small spool. There is also a spring between the valve sleeves, and the spring pushes the small valve core to make the head of the valve core protrude from the outside of the large valve core. There are three working ports for hydraulic oil to enter and exit on the valve body, one of which is connected to In the oil storage chamber, one working port communicates with the liquid passage chamber of the valve seat, and the other working port communicates with the liquid inlet passage provided on the valve sleeve.

A valve pad is provided at the sealing connection between the valve seat and the large valve core.

The utility model adopts the above-mentioned technical scheme. Compared with the prior art, the large-flow hydraulic control check valve has a simple structure, simple installation, convenient disassembly and maintenance, has two valve cores, small hydraulic impact during unloading, and long service life.

Description of drawings

Fig. 1 is the structural representation of hydraulic control check valve of the present utility model;

The marks in the above figures are: 1. Valve sleeve; 2. Large valve core; 3. Valve body; 4. Valve seat; 5. Return spring; 6. Push rod; 7. Fluid chamber; 8. Small valve Core; 9, limit block; 10, liquid inlet channel; 11, valve pad; 12, spring; 13, oil storage cavity.

Detailed ways

As shown in Figure 1, it is a large flow hydraulic control check valve of the present invention, which includes a valve body 3, a valve sleeve 1, a valve core, a valve seat 4 and a push rod 6, and the valve seat 4 is provided with a liquid passage chamber 7. The ejector rod 6 is located inside the valve seat 4, and a limit block 9 is provided inside the valve seat 4 close to the liquid chamber 7, and the head of the ejector rod 6 passes through the limit block 9 and extends into the valve seat 4. In the liquid chamber 7, a return spring 5 is set in the middle of the push rod 6. One end of the return spring 5 is against the limit block 9, and the other end is against the protruding part at the end of the body of the push rod 6. The outer diameter of the protrusion is greater than the shaft diameter of the rest of the push rod 6, and the protrusion slides along the inner wall of the valve seat 4, forming a gap between the protrusion at the end of the push rod 6 and the inner wall of the end of the valve body 3. Oil storage cavity 13 is arranged. There are two spools in the valve sleeve 1, which are respectively a large spool 2 and a small spool 8, the large spool 2 is set on the outside of the small spool 8, the small spool 8 slides in the large spool 2, and the large spool The spool 2 is sealed externally with the valve seat 4, and a spring 12 is also provided between the small spool 8 and the valve sleeve 1, and the spring 12 pushes the small spool 8 so that the head of the spool protrudes from the bottom of the large spool 2. Externally, the push rod 6 moves toward the spool under the push of the oil in the oil storage chamber 13, and first contacts with the small spool 8 to push the small spool 8 to move. At this time, the unloading amount is small. When the big spool 2 contacts, the big spool 2 is pushed to move, and the unloading capacity is larger at this moment. The valve body 3 is provided with three working ports for hydraulic oil to enter and exit, such as the working port A, the working port PA and the working port PB in the figure, wherein the working port PB is connected to the oil storage chamber 13, and the working port PA is connected to the valve seat 4 The liquid passage chamber 7, the working port A communicates with the liquid inlet channel 10 provided on the valve sleeve 1, and the valve sleeve 1 has a working port A'. Compared with the prior art, the large-flow hydraulic control check valve has a simple structure, simple installation, convenient disassembly and maintenance, has two valve cores, has small hydraulic impact during unloading, and has a long service life.

In addition, as shown in FIG. 1 , the hydraulic control check valve is provided with a valve pad 11 on the valve seat 4 , and the large valve core 2 is tightly connected with the valve pad 11 to enhance the sealing performance. In order to further enhance the sealing performance, the large valve core 2 and the valve seat 4 can be directly connected by a hard seal. The large valve core 2 is made of metal material, and vacuum quenching technology is used. After quenching, it is finely ground, and the hardness is high. Compared with the seal made of soft material, the hard seal not only has good sealing performance, but also can withstand ultra-high pressure, and the service life of the check valve is long.

The utility model has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited by the above-mentioned methods, as long as various insubstantial improvements are made by adopting the method concept and technical solutions of the utility model, or Directly applying the ideas and technical solutions of the utility model to other occasions without improvement is within the protection scope of the utility model.

Claims (2)

1. A large-flow hydraulic control check valve is characterized in that: it includes a valve body, a valve sleeve, a valve core, a valve seat and a push rod, the valve seat is provided with a liquid chamber, and the push rod is located inside the valve seat. There is also a limit block inside the valve seat close to the liquid passage chamber. The head of the ejector rod passes through the limit block and extends into the liquid passage chamber of the valve seat. A return spring is also set in the middle of the ejector rod. One end of the spring is against the limit block, and the other end is against the protrusion provided on the body of the ejector rod. An oil storage chamber is formed between the end of the ejector rod and the inner wall of the end of the valve body, which is built into the valve sleeve. The spool is divided into a large spool and a small spool. The large spool is placed outside the small spool. The large spool is sealed with the valve seat. There is also a spring between the small spool and the valve sleeve. The spring pushes The small spool makes the head of the spool protrude from the outside of the large spool, and the valve body is provided with three working ports for hydraulic oil to enter and exit, one of which is connected to the oil storage chamber, and the other is connected to the valve seat. Through the liquid cavity, a working port communicates with the liquid inlet channel provided on the valve sleeve. 2. The hydraulically controlled one-way valve with large flow rate according to claim 1, characterized in that: a valve pad is provided at the sealing connection between the valve seat and the large valve core.

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