CN105275484A - Hydraulic control one-way valve - Google Patents

Abstract

The invention discloses a hydraulic control one-way valve which comprises a valve body, a threaded sleeve, a valve core, a valve seat, a push rod, a first spring and a piston, wherein the valve seat is positioned between the threaded sleeve and the piston, the push rod is axially provided with a head part, a limiting part, a sliding part and a tail part, a first through hole which is adjacent to an unloading cavity and is used for the sliding part of the push rod to pass through is arranged in the valve seat, a second through hole which is used for the tail part of the push rod to pass through is arranged on the piston, the head part and the limiting part of the push rod are positioned in the unloading cavity in the valve seat, and the diameter. According to the hydraulic control one-way valve, the piston connected with the ejector rod is arranged in the valve body, the first spring, the ejector rod, the piston and the valve seat can be connected into a plug-in hydraulic assembly by arranging the limiting part and the retaining ring on the ejector rod, and threads do not need to be arranged on the ejector rod and the valve seat, so that the structures of the ejector rod and the valve seat can be simplified, the processing and manufacturing of the ejector rod and the valve seat are facilitated, and the assembly of the ejector rod, the valve seat and the piston is facilitated.

Description

A hydraulically controlled one-way valve

technical field

The invention relates to a hydraulic component in a hydraulic circuit of a coal mine hydraulic support, in particular to a 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. At present, the hydraulic control check valve is equipped with a plug-in hydraulic component, and the end of the ejector rod and the valve seat are provided with matching threads, resulting in a complicated structure of the ejector rod and the valve seat, which is not conducive to production, and because the ejector rod It passes through the threaded hole in the valve seat. When the ejector rod moves, the surface of the ejector rod will contact the thread in the threaded hole of the valve seat. Long-term use will cause the thread of the valve seat to be damaged, which will eventually affect the removal of the ejector rod.

Contents of the invention

The invention provides a hydraulically controlled one-way valve, the purpose of which is to simplify the structure of a push rod.

In order to achieve the above object, the technical solution adopted by the present invention is: a hydraulically controlled one-way valve, including a valve body, a screw sleeve, a valve core, a valve seat, a push rod and a first spring sleeved on the push rod, the screw sleeve It is inserted into the valve cavity and connected with the valve body by thread, the valve core is built in the screw sleeve, and the valve seat is provided with an unloading cavity. The hydraulic control check valve also includes a Coaxial piston, the valve seat is located between the screw sleeve and the piston, the ejector rod is provided with a head, a limiting part, a sliding part and a tail along the axial direction, and a valve seat adjacent to the unloading chamber is provided in the valve seat And let the sliding part of the ejector rod pass through the first through hole, the piston is provided with a second through hole for the tail of the ejector rod to pass through, and the head of the ejector rod and the limiting part are located in the unloading cavity in the valve seat , the diameter of the limiting part is greater than the diameter of the first through hole, and the tail is provided with a retaining ring for axial limiting, one end of the first spring is against the limit block, and the other end is against the piston; the valve body The first working port, the second working port and the third working port communicated with the valve cavity are arranged on the top, the first working port is coaxial with the valve cavity and located on one side of the piston, the axis of the second working port is in line with the axis of the valve cavity Vertical, and the second working port is located on one side of the screw sleeve, the angle between the axis of the third working port and the axis of the valve cavity is less than 90 degrees, and the third working port is located on one side of the valve seat.

The end of the valve seat is provided with a valve pad for sealing connection with the valve core.

The sealing end of the valve core is a truncated cone structure, and the head of the ejector rod and the valve core start to contact at the valve pad.

The diameter of the sliding portion of the push rod is larger than the diameter of the second through hole.

The diameter of the head of the ejector rod is smaller than the diameter of the limiting part.

In the hydraulically controlled one-way valve of the present invention, a piston connected to the ejector rod is arranged in the valve body, and the first spring, the ejector rod, the piston and the valve seat can be connected to form a plug-in valve by setting a stopper and a stop ring on the ejector rod. Installed hydraulic components, and there is no need to set threads on the ejector rod and valve seat, so that the structure of the ejector rod and valve seat can be simplified, which is beneficial to the processing of the ejector rod and valve seat, and also facilitates the connection between the ejector rod and the valve seat and the piston. assembly.

Description of drawings

This manual includes the following drawings, the contents shown are:

Fig. 1 is a sectional view of a hydraulic control check valve of the present invention;

Fig. 2 is a sectional view of the push rod;

Fig. 3 is a sectional view of the valve seat;

Fig. 4 is a sectional view of the piston;

Fig. 5 is a top view of the hydraulic control check valve of the present invention;

Labeled in the figure:

1. Screw sleeve; 2. Valve body; 21. Valve cavity; 22. Installation slope;

3. Push rod; 31. Head; 32. Limiting part; 33. Sliding part; 34. Tail part;

4. Valve seat; 41. Unloading cavity; 42. Port; 43. First through hole; 44. Receiving groove;

5. Piston; 51. Second through hole;

6. Retaining ring; 7. Valve core; 8. First spring; 9. Second spring; 10. Valve pad;

PB, the first working port; A, the second working port; PA, the third working port.

detailed description

The specific embodiment of the present invention will be described in further detail by describing the embodiments below with reference to the accompanying drawings, the purpose is to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and contribute to its implementation.

As shown in Figures 1 to 5, a hydraulic control check valve of the present invention includes a valve body 2, a screw sleeve 1, a valve core 7, a valve seat 4, a push rod 3, a first spring 8 and a second spring 9, The first spring 8 is sleeved on the push rod 3 . The valve cavity 21 is a circular hole formed by indenting from one end of the valve body 2 toward the inside of the valve body 2. The screw sleeve 1 is inserted into the valve cavity 21 at this end of the valve body 2 and is threadedly connected with the valve body 2. This end closes off the valve chamber 21 . Inside the valve chamber 21, there is a stepped surface for limiting the valve seat 4 in the axial direction. The end of the screw sleeve 1 inserted into the valve chamber 21 is sleeved on one end of the valve seat 4. When the screw sleeve 1 is tightened, the screw sleeve 1 Push the valve seat 4 to move in the valve chamber 21 so that the other end of the valve seat 4 contacts the stepped surface in the valve chamber 21, and the screw sleeve 1 cooperates with the stepped surface to clamp the valve seat 4. There is an unloading chamber 41 inside the valve seat 4, and a port 42 communicating with the unloading chamber 41 is provided on the end surface of the valve seat 4 facing the screw sleeve 1, and the port 42 is axially penetrating through the end side of the valve seat 4. The wall is a circular hole coaxial with the spool 7. The valve core 7 is built in the screw sleeve 1, and a concave hole for accommodating the valve core 7 is provided inside the screw sleeve 1, and the second spring 9 is located in the concave hole, and one end of the second spring 9 is against the inner wall of the screw sleeve 1 , the other end is inserted into the valve core 7, and the second spring 9 is used to push the valve core 7 to move toward the port 42 of the valve seat 4, so as to realize the closing of the hydraulic control check valve. The hydraulic control check valve also includes a piston 5 inserted into the valve chamber 21 of the valve body 2 and coaxial with the valve seat 4, the valve seat 4 is located between the screw sleeve 1 and the piston 5, the piston 5 is a cylindrical structure, and the piston 5 It can slide axially in the valve cavity 21 . The ejector rod 3 is a revolving body coaxial with the piston 5 and the sliding seat. The ejector rod 3 is provided with a head 31, a limiting part 32, a sliding part 33 and a tail part 34 in sequence along the axial direction. The cavity 41 is adjacent to the first through hole 43 that allows the sliding part 33 of the push rod 3 to pass through, the piston 5 is provided with the second through hole 51 that allows the tail portion 34 of the push rod 3 to pass through, and the head of the push rod 3 31 and the limiting part 32 are located in the unloading cavity 41 in the valve seat 4, the diameter of the limiting part 32 is larger than the diameter of the first through hole 43, the tail part 34 is provided with a retaining ring 6 for axial limiting, the first spring One end of 8 is against the limit block, and the other end is against the piston 5. Since the push rod 3 is provided with a limiting portion 32 and a retaining ring 6, the ejector rod 3 is axially limited by the limiting portion 32 and the retaining ring 6, and the ejector rod 3 is connected with the valve seat 4 and the piston 5 and sleeved on the The first spring 8 on the ejector rod 3 forms an integral structure, forming a plug-in hydraulic assembly that can be inserted into the valve cavity 21. The ejector rod 3 and the valve seat 4 do not need to be threaded, and neither the ejector rod 3 nor the valve seat 4 Threads are set, so that the structure of the ejector rod 3 and the valve seat 4 can be simplified, which is beneficial to the processing and manufacture of the ejector rod 3 and the valve seat 4, and also facilitates the assembly of the ejector rod 3, the valve seat 4 and the piston 5, and improves the assembly of hydraulic components efficiency.

As shown in FIGS. 1 and 5 , the valve body 2 is provided with a first working port PB, a second working port A and a third working port PA communicating with the valve cavity 21 . The first working port PB is coaxial with the valve cavity 21 and is located on one side of the piston 5. The first working port PB is set at the other end opposite to the end where the screw sleeve 1 is located in the length direction of the valve body 2. From the first working port The hydraulic oil entered by the PB can push the piston 5 to move, and then the piston 5 pushes the ejector rod 3 to move toward the valve core 7 until it contacts the valve core 7, and the hydraulic control check valve opens. The second working port A is set on one side of the valve body 2 in the thickness direction. The setting position of the working port A corresponds to the screw sleeve 1, the second working port A communicates with the valve chamber 21, and a liquid passage hole corresponding to the position of the concave hole is provided on the side wall of the screw sleeve 1, and the concave hole in the screw sleeve 1 passes through the passage. The liquid hole communicates with the second working port A. The third working port PA is set on an installation slope 22 on the valve body 2. The installation slope 22 extends from the edge of the end face where the first working port PB is located toward the side edge where the second working port A is located. The installation slope 22 and The included angle between the end face and the side surface is greater than 90 degrees, the axis of the third working port PA is perpendicular to the installation slope 22, and the third working port PA is arranged obliquely relative to the first working port PB and the second working port A , to match the posture of the joint inserted into the third working port PA, so as to facilitate the insertion of the joint. The angle between the axis of the third working port PA and the axis of the valve cavity 21 is less than 90 degrees, and the third working port PA is located on one side of the valve seat 4, and the side wall of the valve seat 4 is provided with an unloading chamber 41 is a fluid hole communicating with the valve cavity 21, through which the third working port PA can communicate with the unloading hole.

As shown in Figure 5, there are two second working ports A on the valve body 2, and the valve cavity 21 is located at the center of the valve body 2 in the width direction. The axes are symmetrically distributed along the line of symmetry, and the two second working ports A communicate with the valve cavity 21 on both sides of the axis of the valve cavity 21 .

As shown in FIG. 1 , the hydraulic control check valve is provided with a valve pad 10 coaxial with the valve core 7 at the port 42 of the valve seat 4 , and the valve core 7 is tightly connected with the valve pad 10 to enhance the sealing performance. In order to further enhance the sealing performance, the valve core 7 and the valve seat 4 can be directly connected by a hard seal. The valve core 7 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 soft material seal and the hard seal not only have good sealing performance, but also can withstand ultra-high pressure, and the service life of the check valve is long. As shown in Figure 1, the head of the spool 7 is a truncated cone structure, the head of the spool 7 no longer extends into the unloading chamber 41, and the head 31 of the ejector rod 3 and the spool 7 are only on the valve seat 4. The upper valve pad 10 starts to contact, the structure of the valve core 7 is simpler, and the overall structure of the hydraulic control check valve is more compact.

As shown in Figures 1 and 2, the surface at the head 31 of the push rod 3 is a smooth surface, and the diameter of the head 31 is smaller than the diameter of the stopper 32, and the stopper 32 is a conical structure, and its small-diameter end is in contact with the head. The large-diameter end is connected with the sliding part 33, and the diameter of the large-diameter end of the limiting part 32 is larger than the diameter of the first through hole 43 on the valve seat 4, which can play a position-limiting role, so that when the push rod 3 and the valve seat 4 can prevent valve seat 4 from slipping after being connected. Moreover, the diameter of the sliding portion 33 of the push rod 3 is greater than the diameter of the second through hole 51 on the piston 5, and the retaining ring 6 is stuck on the tail portion 34, and the retaining ring 6 and the sliding portion 33 are distributed on both sides of the piston 5, at the tail portion 34 axially limit the piston 5, so that the push rod 3 is connected with the piston 5.

Preferably, the circlip 6 installed on the tail portion 34 of the push rod 3 is an elastic circlip for the shaft.

Preferably, as shown in Fig. 1 and Fig. 3, on the end of the valve seat 4 facing the piston 5, a circular accommodation groove 44 is formed concavely from the end surface toward the inside, and the accommodation groove 44 is used for accommodating The first spring 8, the accommodating groove 44 communicates with the first through hole 43 and is coaxial, the sliding part 33 passes through the accommodating groove 44, the first spring 8 is sleeved on the sliding part 33, and one end of the first spring 8 is inserted into the accommodating groove 44 and against the inner wall of the receiving groove 44. The accommodating groove 44 is provided on the valve seat 4, the first spring 8 can be positioned, the axial positioning of the first spring 8 is more reliable, the first spring 8 will not be bent and inclined in the valve seat 4, and the first spring 8 can be positioned. The guiding performance of the spring 8 ensures better axial force of the first spring 8 .

The working principle of the hydraulic control check valve is the same as that of the prior art. The length of the hydraulic control check valve is 132mm, the width is 80mm, the thickness is 85mm, the nominal flow rate is 250L/min, and the nominal pressure is 50MPa, the working medium is emulsion.

The present invention has been exemplarily described above with reference to the accompanying drawings. Apparently, the specific implementation of the present invention is not limited by the above methods. As long as various insubstantial improvements are made using the method concept and technical solution of the present invention; or without improvement, the above-mentioned concept and technical solution of the present invention are directly applied to other occasions, all within the protection scope of the present invention within.

Claims (5)

1. A hydraulically controlled one-way valve, comprising a valve body, a screw sleeve, a valve core, a valve seat, a push rod and a first spring sleeved on the push rod, the screw sleeve inserted into the valve cavity is threadedly connected with the valve body, The valve core is built in the screw sleeve, and the valve seat is provided with an unloading cavity, which is characterized in that it also includes a piston inserted into the valve cavity of the valve body and coaxial with the valve seat, and the valve seat is located on the screw sleeve. Between the piston and the piston, the ejector rod is provided with a head, a limiting part, a sliding part and a tail in the axial direction, and a first valve seat adjacent to the unloading chamber and allowing the sliding part of the ejector rod to pass through is provided in the valve seat. Through hole, the piston is provided with a second through hole through which the tail of the ejector rod passes. The head of the ejector rod and the limiting part are located in the unloading cavity in the valve seat, and the diameter of the limiting part is larger than that of the first through hole. Diameter, the tail is provided with a retaining ring for axial limit, one end of the first spring is against the limit block, and the other end is against the piston; the valve body is provided with a first working port that communicates with the valve chamber , the second working port and the third working port, the first working port is coaxial with the valve cavity and located on one side of the piston, the axis of the second working port is perpendicular to the axis of the valve cavity, and the second working port is located at one side of the screw sleeve On the side, the angle between the axis of the third working port and the axis of the valve cavity is less than 90 degrees, and the third working port is located on one side of the valve seat. 2. The hydraulic control check valve according to claim 1, characterized in that: the end of the valve seat is provided with a valve pad for sealing connection with the valve core. 3 . The hydraulic control check valve according to claim 2 , wherein the sealing end of the valve core is a frustum of cone structure, and the head of the ejector rod and the valve core start to contact at the valve pad. 4 . 4. The hydraulic control check valve according to claim 2 or 3, characterized in that: the diameter of the sliding part of the push rod is larger than the diameter of the second through hole. 5. The hydraulic control check valve according to claim 4, characterized in that: the diameter of the head of the ejector rod is smaller than the diameter of the limiting portion.