CN105257323A - Medium-flow safety valve - Google Patents

Abstract

The invention discloses a medium-flow safety valve which comprises a valve shell, a valve sleeve, a valve core, a valve body, a spring seat and a pressure regulating screw, wherein the pressure regulating screw and the valve body are respectively connected with two ends of the valve shell, one end of the spring is abutted against the pressure regulating screw, the other end of the spring is abutted against the spring seat, the end part of the valve core is contacted with the spring seat, and the spring seat is provided with a liquid passing hole for enabling liquid entering between the spring seat and the valve sleeve to flow into a space between the spring seat and. This medium flow relief valve is through setting up the liquid hole on the spring holder, and when the high-pressure oil in the admission valve body flowed into between spring holder and the valve barrel from the gap between case and the valve barrel, high-pressure oil can be through the liquid hole of crossing on the spring holder in flowing into the space between spring holder and the adjusting screw, and high-pressure oil can not block up between spring holder and valve barrel, avoids producing the resistance to the spring holder when the spring holder removes, ensures that the spring holder can be fast convenient promotes the case and removes to close the relief valve.

Description

A Medium Flow Safety Valve

technical field

The invention relates to a coal mine fully mechanized mining hydraulic support, in particular to a middle-flow safety valve.

Background technique

With the large-scale implementation and development of coal mine fully mechanized mining hydraulic supports, fully mechanized mining work has more and more stringent requirements for hydraulic supports, so there are further requirements for the safety valve of the hydraulic cylinder of the protection support, especially for the safety valve There are further requirements for the service life and reliability of the hydraulic support. When the pressure from the top of the hydraulic support causes passive force, whether the safety valve can unload in a short time, fully and stably under the condition of high pressure directly affects the service life of the support. and support security. It will not only damage seals, pipes and hydraulic components, but also cause vibration and noise; sometimes cause errors in certain pressure-controlled hydraulic components.

The currently used safety valve includes valve casing, valve sleeve, valve core, valve body, spring, spring seat and pressure regulating screw. Inside the valve casing, one end of the spring is against the pressure regulating screw threaded with the end of the valve casing. , the other end rests on the movable spring seat, the valve body is inserted into the other end of the valve casing and is threadedly connected with the valve casing, the valve sleeve is set inside the valve body and is threadedly connected with the valve body, the valve core is located between the valve sleeve and the valve body body, and the spool is in contact with the spring seat. This kind of safety valve adopts a straight-through unloading method, which is sealed by a single O-ring, and the valve core moves back and forth. The unloading hole on the valve core often rubs against the O-ring, which may damage the sealing ring and cause the safety valve to fail. Moreover, when this kind of safety valve is unloaded, the high-pressure oil entering the valve body will flow into the spring seat and the valve sleeve through the gap between the valve core and the valve sleeve, and the high-pressure oil is blocked here, making it difficult for the spring to push the valve core. Return to close the safety valve.

Contents of the invention

The invention provides a medium-flow safety valve, which aims at preventing high-pressure oil from being blocked between a spring seat and a valve sleeve.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a medium-flow safety valve, including a valve casing, a valve sleeve, a valve core, a valve body, a spring, a spring seat and a pressure regulating screw, and the valve body is provided with an unloading hole , the pressure regulating screw and the valve body are respectively connected to both ends of the valve casing, one end of the spring inside the valve casing is against the pressure regulating screw, and the other end is against the spring seat inside the valve casing and on one side of the valve body, the valve The sleeve is inserted into the valve body at the end opposite to the spring seat on the valve body to connect with the valve body. The valve core is located in the valve sleeve and the valve body, and the end of the valve core is in contact with the spring seat. The liquid entering between the spring seat and the valve sleeve flows to the liquid passage hole in the space between the spring seat and the pressure regulating screw.

A plurality of the liquid passage holes are arranged on the opposite end of the spring seat to the valve body in the circumferential direction, and the axis of the liquid passage holes is parallel to the axis of the spring seat.

The spring seat is a cylindrical structure with a concave hole for accommodating the spring at the end opposite to the pressure regulating screw, and the spring seat is in clearance fit with the valve housing.

The end face of the spring seat opposite to the valve body is provided with a spherical boss in contact with the end of the valve core, and the end face of the valve core in contact with the boss is a plane.

A limiting step is provided on the inner wall of the valve housing near the middle of the valve housing in the length direction.

The sealing structure between the valve core and the valve sleeve includes a first sealing ring sleeved on the valve core and a second sealing ring sleeved on the first sealing ring, and the material of the first sealing ring is composite plastic.

The second sealing ring is an O-ring.

A first dustproof cover for covering the unloading hole is sheathed on the valve body.

The end of the valve housing is sheathed with a second dustproof cover.

The working port of the valve body is covered with a nut.

In the medium flow safety valve of the present invention, by providing a liquid passage hole on the spring seat, when the high-pressure oil entering the valve body flows into the space between the spring seat and the valve sleeve from the gap between the valve core and the valve sleeve, the high-pressure oil will pass through the spring The liquid hole on the seat flows into the space between the spring seat and the adjusting screw, and the high-pressure oil will not be blocked between the spring seat and the valve sleeve, avoiding resistance to the spring seat when the spring seat moves, ensuring that the spring seat can be quickly and conveniently Push the spool to move to close the safety valve.

Description of drawings

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

Fig. 1 is the sectional view of flow safety valve among the present invention;

Fig. 2 is a sectional view of the spring seat;

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

Fig. 4 is an enlarged view of the sealing structure at A in Fig. 1;

Fig. 5 is an enlarged view of the sealing structure at B in Fig. 1;

Labeled in the figure:

1. Regulating screw; 2. Valve casing; 3. Spring seat; 31. Concave hole; 32. Boss; 33. First liquid hole; 4. Spring; 5. Valve sleeve; 51. Second liquid hole ;52, inner groove; 53, outer groove; 6, spool; 7, the first dust cover; 8, the second dust cover; 9, valve body; 10, nut; 11, the first sealing ring ; 12, the second sealing ring; 13, the limit step; 14, the first unloading hole; 15, the second unloading hole.

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 medium-flow safety valve of the present invention includes a valve casing 2, a valve sleeve 5, a valve core 6, a valve body 9, a spring 4, a spring seat 3, a pressure regulating screw 1, and a valve body 9 There is a first unloading hole 14 that penetrates the side wall in the radial direction. The pressure regulating screw 1 and the valve body 9 are respectively connected to the two ends of the valve housing 2. The pressure regulating screw 1 is screwed into the valve housing at one end of the valve housing 2. 2 and is threaded with the valve housing 2, the valve body 9 is inserted into the valve housing 2 at the other end of the valve housing 2 and is threaded with the valve housing 2. Both the spring 4 and the spring seat 3 are located in the valve casing 2, the spring seat 3 is located on one side of the valve body 9, the spring seat 3 can move axially in the valve casing 2, and one end of the spring 4 is against the pressure regulating screw 1 , the other end against the spring seat 3. The valve sleeve 5 is inserted into the valve body 9 at the end opposite to the spring seat 3 on the valve body 9 and is threadedly connected with the valve body 9. A cavity for accommodating the valve sleeve 5 is correspondingly provided in the valve body 9. The first unloading The hole 14 communicates with the cavity, and the cavity communicates with the working port at the end of the valve body 9 . The valve core 6 is inserted into the valve sleeve 5 and the valve body 9. When the valve is in the closed state, a part of the valve core 6 is located in the center hole of the valve sleeve 5, and the remaining part is located in the cavity containing the valve sleeve 5 in the valve body 9. . One end of the spool 6 facing the working port of the valve body 9 is provided with an unloading cavity communicated with the working port of the valve body 9, and the position corresponding to the unloading cavity on the spool 6 is provided with a second unloading chamber radially penetrating the side wall. The loading hole 15, the second unloading hole 15 communicates with the unloading cavity. The other end of the spool 6 is in contact with the spring seat 3. After the high-pressure oil enters the working port of the valve body 9, the high-pressure oil will push the spool 6 to move, and the spool 6 will then push the spring seat 3 to move until the first position on the spool 6 The second unloading hole 15 communicates with the first unloading hole 14 on the valve body 9 through the second liquid passage hole 51 on the valve sleeve 5 to form an oil passage for high-pressure oil to pass through. The spring seat 3 of the flow safety valve in this paper is also provided with a first fluid hole 33 that allows the liquid entering between the spring seat 3 and the valve sleeve 5 to flow to the space between the spring seat 3 and the pressure regulating screw 1, so that The high-pressure oil will not be blocked between the spring seat 3 and the valve sleeve 5, avoiding resistance to the spring seat 3 when the spring seat 3 needs to push the valve core 6 to move, and ensuring that the spring seat 3 can quickly and conveniently push the valve core 6 to move. To close the safety valve to ensure that the safety valve works reliably.

Specifically, the spring seat 3 is a cylindrical structure with a concave hole 31 for accommodating the spring 4 at the end opposite to the pressure adjusting screw 1, and the concave hole 31 is formed on the end surface of the spring seat 3 extending toward the inside of the spring seat 3. The circular hole, the end of the spring 4 is inserted into the concave hole 31 for positioning, the spring seat 3 is in clearance fit with the valve housing 2, and the outer cylindrical surface of the spring seat 3 is a smooth surface. The spring seat 3 of this structure can make the axial positioning of the spring 4 more reliable, and the spring 4 will not bend and tilt in the valve housing 2, which improves the guiding performance of the spring 4 and ensures better axial force of the spring 4.

The first liquid passage hole 33 is provided with a plurality of circumferentially on the opposite end of the spring seat 3 and the valve body 9, the first liquid passage hole 33 runs through the end of the spring seat 3, and communicates with the concave hole 31, and each The axis of the first fluid hole 33 is parallel to the axis of the spring seat 3 . In this embodiment, there are four first liquid passage holes 33 evenly distributed.

As shown in Figures 1 and 2, a spherical boss 32 in contact with the end of the valve core 6 is provided on the end face of the spring seat 3 opposite to the valve body 9, and the end face of the valve core 6 in contact with the boss 32 It is a plane perpendicular to its axis, and a point-surface contact is formed between the valve core 6 and the boss 32 of the spring seat 3. The function of the boss 32 is to make the spring seat 3 and the valve core 6 have good self-adaptability during the movement process. Make the spring seat 3 have a good centering property, make it fit well with the valve core 6 and the valve housing 2, and ensure the reliable operation of the safety valve. The first liquid passage holes 33 on the spring seat 3 are evenly distributed along the circumferential direction on the periphery of the boss 32 .

As shown in Figure 1, on the inner wall of the valve housing 2, there is a limit step 13 protruding toward the inside of the valve housing 2 near the middle of the length direction of the valve housing 2, and the limit step 13 is located between the spring seat 3 and the Between the pressure regulating screws 1, the moving spring seat 3 can be used as a limit.

As shown in Figure 1, there are two sealing structures in the axial direction between the valve core 6 and the valve sleeve 5, one is located at the inner end of the valve sleeve 5, and the other is located near the outer end. The sealing structure is the same, as shown in Figure 4 and Figure 5, the sealing structure includes a first sealing ring 11 sleeved on the valve core 6 and a second sealing ring 12 sleeved on the first sealing ring 11, the first sealing ring 11 is made of composite plastics, which has a longer service life and better sealing effect than traditional O-shaped sealing rings. The second sealing ring 12 is an O-ring, and the second sealing ring 12 applies pressure to the first sealing ring 11 to make the valve core 6 reliably seal. The valve sleeve 5 and the valve core 6 are sealed by two sealing structures. On the one hand, the sealing effect can be further improved, and the amount of high-pressure oil entering the space between the valve sleeve 5 and the spring seat 3 can be reduced; The direction can limit the valve core 6 to a certain extent.

As shown in Figure 1, a first dustproof cover 7 for covering the unloading hole is set on the valve body 9, and a second dustproof cover 8 is set at the end of the valve housing 2. The dustproof jacket 7 and the second dustproof jacket 8 can improve the waterproof, dustproof and rustproof performance of the safety valve, and improve the service life of the safety valve. A nut 10 is sleeved at the working port of the valve body 9. Since the outer surface of the working port of the valve body 9 is provided with external threads, the nut 10 is threadedly connected with the valve body 9, and the nut 10 can act as a protection valve. The effect of body 9 surface threads.

As shown in Figure 3, an inner groove 52 is provided on the inner wall of the central hole of the valve sleeve 5 corresponding to the second liquid passage 51, and an inner groove 52 is provided on the outer wall of the valve sleeve 5 corresponding to the second liquid passage 51. The outer groove 53, the inner groove 52 and the outer groove 53 are all annular grooves, the inner groove 52 and the outer groove 53 communicate with the second liquid hole 51, and the outer groove 53 communicates with the first hole on the valve body 9. A unloading hole 14 communicates. The width of the inner groove 52 is greater than the diameter of the second liquid passage hole 51, the width of the outer groove 53 is greater than the diameter of the first unloading hole 14, and the axis of the first unloading hole 14 is aligned with the axis of the second liquid passage hole 51. Parallel, there is a certain distance between the two axes, and the two are not on the same axis, so that the setting position of the first unloading hole 14 will not affect the sealing between the valve sleeve 5 and the valve body 9, and avoid sealing failure.

The nominal pressure of the medium flow safety valve with the above structure is 50MPa, and the nominal flow rate is 250L/min.

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 (10)

1. A medium-flow safety valve, including a valve casing, a valve sleeve, a valve core, a valve body, a spring, a spring seat and a pressure regulating screw. The valve body is provided with an unloading hole, and the pressure regulating screw and the valve body are respectively connected to the valve casing. One end of the spring located inside the valve housing is against the pressure regulating screw, and the other end is against the spring seat located inside the valve housing and on one side of the valve body. The valve sleeve is on the valve body opposite to the spring seat. The end of the valve core is inserted into the valve body and connected with the valve body. The valve core is located in the valve sleeve and the valve body, and the end of the valve core is in contact with the spring seat. The liquid between the sleeves flows to the liquid passage hole in the space between the spring seat and the pressure regulating screw. 2. The medium flow safety valve according to claim 1, characterized in that: the liquid passage hole is provided in a plurality on the end of the spring seat opposite to the valve body along the circumferential direction, and the liquid passage hole The axis is parallel to the axis of the spring seat. 3. The medium flow safety valve according to claim 1 or 2, characterized in that: the spring seat is a cylindrical structure with a concave hole for accommodating the spring at the end opposite to the pressure regulating screw , The spring seat is in clearance fit with the valve housing. 4. The medium flow safety valve according to claim 3, characterized in that: the end surface of the spring seat opposite to the valve body is provided with a spherical boss in contact with the end of the valve core, and the valve core is in contact with the end of the valve core. The end faces that the boss contacts are planar. 5 . The medium flow safety valve according to claim 4 , wherein a limit step is provided on the inner wall of the valve housing near the middle of the valve housing in the length direction. 5 . 6. The medium flow safety valve according to claim 5, characterized in that: the sealing structure between the valve core and the valve sleeve comprises a first sealing ring sleeved on the valve core and a first sealing ring sleeved on the first sealing ring. The second sealing ring on the top, the material of the first sealing ring is composite plastics. 7. The medium flow safety valve according to claim 6, wherein the second sealing ring is an O-ring. 8. The medium-flow safety valve according to claim 7, wherein a first dustproof cover for covering the unloading hole is sheathed on the valve body. 9. The medium flow safety valve according to claim 8, characterized in that: the end of the valve housing is covered with a second dustproof cover. 10. The medium flow safety valve according to claim 9, characterized in that: the end of the valve body is sleeved with a nut.