CN204060740U - a safety valve - Google Patents

Abstract

The utility model discloses a safety valve, including valve casing, valve barrel, case and joint, the valve barrel is equipped with first liquid hole and the second of crossing and crosses the liquid hole, and the case insert in the valve barrel and with the valve barrel between be equipped with first seal structure, first seal structure be located first liquid hole and the second of crossing and cross between the liquid hole, first seal structure is equipped with the constant head tank that holds first sealing washer including the first sealing washer of cover on the case and the second sealing washer of cover on first sealing washer on the outer periphery of first sealing washer. This relief valve sets up the seal structure who constitutes by two matched with sealing rings between case and valve barrel, and first sealing washer is for being equipped with the dysmorphism circle of constant head tank, forms the extrusion to first sealing washer in the second sealing washer embedding constant head tank to make first sealing washer inseparabler with the case contact, finally can improve the sealed effect between case and the valve barrel.

Description

a safety valve

technical field

The utility model relates to a coal mine fully mechanized mining hydraulic support, in particular to a 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, joint, return spring, spring seat and pressure regulating screw. Inside the valve casing, one end of the return 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 joint is inserted into the other end of the valve housing and is threadedly connected with the valve housing. There is a cavity inside the joint for accommodating the valve sleeve. The valve core is located in the joint and passes through the valve sleeve. The end of 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. The valve core moves back and forth. Valve failed.

Utility model content

The utility model provides a safety valve, which aims to improve the sealing effect between a valve core and a valve sleeve.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a safety valve, including a valve casing, a valve sleeve, a valve core and a joint, the joint is provided with a working port and an unloading hole, and the valve core is provided with a working port with the joint. One end of the valve sleeve is inserted into the joint, and the other end is inserted into the valve casing. The valve sleeve is located in the joint and is provided with a first liquid passage hole communicating with the unloading hole. The valve The part of the sleeve located in the valve housing is provided with a second liquid passage hole communicating with the unloading hole. The valve core is inserted into the valve sleeve and a first sealing structure is provided between the valve sleeve. The first sealing structure is located in the first passage. Between the liquid hole and the second liquid hole, the first sealing structure includes a first sealing ring sleeved on the valve core and a second sealing ring sleeved on the first sealing ring, and the outer peripheral surface of the first sealing ring is provided with There is a positioning groove for accommodating the first sealing ring.

The positioning groove is an annular positioning groove extending along the entire circumferential direction on the outer peripheral surface of the first sealing ring, and the longitudinal section of the positioning groove is arc-shaped.

A second sealing structure identical to the first sealing structure is provided between the valve core and the valve sleeve.

The first sealing structure is located at the part of the valve sleeve inserted into the valve casing, the second sealing structure is located at the position of the valve sleeve inserted into the joint, and the second sealing structure is located at the first Between a liquid passage hole and the end face of the valve sleeve.

The valve sleeve is provided with an inner cavity that accommodates the valve core and extends from one end face to the other end face in the axial direction. The inner cavity includes a large-diameter cavity communicating with the first liquid passage hole and a The small-diameter chamber connected to the second liquid passage hole has a diameter larger than that of the small-diameter chamber.

The spool includes a large-diameter body inserted into the large-diameter cavity and a small-diameter body inserted into the small-diameter cavity, the large-diameter body is provided with a third liquid passage hole for connecting the large-diameter cavity and the inner cavity of the spool, The small-diameter body is provided with a fourth liquid passage hole for connecting the small-diameter cavity and the inner cavity of the valve core.

The inner cavity of the valve sleeve also includes a medium-diameter cavity between the large-diameter cavity and the small-diameter cavity, and the medium-diameter cavity is provided with a screw sleeve that is threadedly connected with the valve sleeve, and the screw sleeve is provided with a A hole through which the small-diameter body of the spool passes.

The small-diameter body of the valve core is provided with a fifth liquid passage hole for connecting the large-diameter cavity and the inner cavity of the valve core, and the fifth liquid passage hole is located between the fourth liquid passage hole and the large-diameter body. between the ends.

The inner cavity of the spool includes a large-diameter hole, a middle-diameter hole, and a small-diameter hole that are sequentially arranged in the axial direction and whose diameter gradually decreases. The third liquid passage hole communicates with the large-diameter hole, and the fourth liquid passage hole The hole and the fifth liquid passage hole communicate with the small-diameter hole.

The outer peripheral surface of the part of the valve sleeve located in the valve housing is provided with a liquid passage groove communicated with the second liquid passage hole, and the liquid passage groove is located between the first liquid passage hole and the second liquid passage hole. between holes.

In the safety valve of the present utility model, a sealing structure composed of two matching sealing rings is set between the valve core and the valve sleeve, and the first sealing ring is a special-shaped ring with a positioning groove on the outer peripheral surface, and the second sealing ring Embedded in the positioning groove, the first sealing ring is squeezed, so that the first sealing ring is in closer contact with the valve core, and the pressure liquid overflowing from the valve core's liquid passage hole is weakened. erosion, thereby improving the sealing reliability and service life of the sealing structure, and finally improving the sealing effect between the valve core and the valve sleeve.

Description of drawings

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

Fig. 1 is the sectional view of safety valve of the present utility model;

Fig. 2 is a sectional view of the valve sleeve;

Fig. 3 is a sectional view of the spool;

Figure 4 is a sectional view of the joint;

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

Figure 6 is an enlarged view of the second sealing structure at B in Figure 1;

Fig. 7 is a sectional view of the first sealing ring;

Figure 8 is an enlarged view at C in Figure 1;

Fig. 9 is a sectional view of the valve housing and the reset mechanism;

Fig. 10 is a sectional view of the pressure regulating screw;

Figure 11 is a sectional view of the spring seat;

Figure 12 is a sectional view of the valve core assembly;

Labeled in the figure:

1. Pressure adjusting screw;

2. Return spring;

3. Spring seat; 31. The first boss; 32. The guide section; 33. The second boss;

4. Joint; 41. Working port; 42. Unloading cavity; 43. Unloading hole;

5. Valve sleeve; 51. First liquid passage hole; 52. Second liquid passage hole; 53. Large diameter chamber; 54. Medium diameter chamber; 55. Small diameter chamber; 56. Balance chamber; 57. Liquid passage tank; 58 , the first inner groove; 59, the second inner groove; 510, the third inner groove; 511, the fourth inner groove; 512, the first outer groove; 513, the second outer groove; Three outer grooves; 515, limit block; 516, first inner wall surface; 517, second inner wall surface; 518, fifth inner groove; 519, sixth inner groove;

6, spool; 61, the third liquid hole; 62, the fourth liquid hole; 63, the fifth liquid hole; 64, large diameter body; 65, small diameter body; 66, large diameter hole; 67, middle diameter Hole; 68, small diameter hole; 69, stop surface;

7. The first sealing ring; 71. The positioning groove; 8. The second sealing ring;

9. Valve housing; 91. Step surface; 10. Screw sleeve; 11. Thread segment; 12. The third boss; 13. The third sealing ring; 14. The fourth sealing ring; 15. The fifth sealing ring; 16. The sixth sealing ring; 17, air vent; 18, inner hexagonal hole.

Detailed ways

Next, with reference to the accompanying drawings, through the description of the embodiments, the specific implementation of the present utility model will be further described in detail, 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 utility model , and contribute to its implementation.

As shown in FIGS. 1 to 12 , a safety valve of the present invention includes a valve casing 9 , a valve sleeve 5 , a valve core 6 , a joint 4 , a pressure regulating screw 1 , a return spring 2 and a spring seat 3 .

The valve casing 9 is a cylindrical member with openings at both ends and a hollow interior. The pressure regulating screw 1 and the joint 4 are threadedly connected to the valve casing 9 at opposite ends of the valve casing 9 respectively. The pressure regulating screw 1 is at one end of the valve casing 9 Screw into the valve housing 9 and be threaded with the valve housing 9, and the joint 4 is threaded with the valve housing 9 at the other end of the valve housing 9 covering the end of the valve housing 9. The return spring 2 and the spring seat 3 form a reset mechanism that pushes the valve core 6 to move to close the safety valve. Between them, the spring seat 3 is pushed by the return spring 2 and the valve core 6 in the valve casing 9 to slide axially, the valve core 6 pushes the spring seat 3 to move toward the pressure regulating screw 1 to open the safety valve, and the return spring 2 pushes the spring Seat 3 moves toward valve sleeve 5 to close the safety valve.

The joint 4 is used to connect with the oil cylinder of the fully mechanized mining hydraulic support in the coal mine. The joint 4 is provided with a working port 41, an unloading chamber 42 and an unloading hole 43. A circular hole extending axially toward the inside of the joint 4. The unloading cavity 42 is a stepped hole formed in the inside of the joint 4 from the working port 41 in the axial direction toward the end face of the other end of the joint 4. The unloading cavity 42 is connected to the working The port 41 is coaxial, and the unloading hole 43 is a circular hole radially penetrating through the joint 4 on the side wall of the joint 4. A plurality of them are uniformly distributed along the circumferential direction, so that the oil entering the safety valve from the working port 41 flows out.

The valve sleeve 5 and the valve core 6 of the safety valve constitute a valve core assembly, and the valve core assembly is provided with a sealing structure for sealing between the valve housing 9 and the joint 4 and for sealing between the valve sleeve 5 and the valve core 6 . The valve sleeve 5 is located in the joint 4 and the valve housing 9. The valve sleeve 5 is coaxial with the valve housing 9 and the joint 4. One end of the valve sleeve 5 is inserted into the unloading chamber 42 of the joint 4, and the other end is inserted into the inner hole of the valve housing 9. , the valve sleeve 5 is provided with an inner cavity for accommodating the spool 6, and the valve sleeve 5 is located in the joint 4. A valve is provided to connect the inner cavity of the valve sleeve 5 with the unloading cavity 42 and the unloading hole 43 of the joint 4. The first liquid passage hole 51, the second liquid passage hole 52 connecting the inner cavity of the valve sleeve 5 with the unloading cavity 42 and the unloading hole 43 of the joint 4 is provided at the position of the valve sleeve 5 located in the valve housing 9. There is a certain distance between the first liquid passage hole 51 and the second liquid passage hole 52 , and a plurality of the first liquid passage hole 51 and the second liquid passage hole 52 are evenly distributed on the side wall of the valve sleeve 5 along the circumferential direction. The spool 6 is located in the joint 4 and the valve sleeve 5. The spool 6 and the valve sleeve 5 are coaxial. The spool 6 is movable in the axial direction in the valve sleeve 5. The inner cavity communicated with the port 41, the side wall of the valve core 6 is provided with a liquid passage hole for communicating the inner cavity with the inner cavity of the valve sleeve 5.

The sealing structure of the valve core assembly includes a first sealing structure arranged between the valve core 6 and the valve sleeve 5, and the first sealing structure is located between the first liquid passage hole 51 and the second passage along the axial direction of the valve sleeve 5. Between the liquid holes 52, the first sealing structure includes a first sealing ring 7 sleeved on the valve core 6 and a second sealing ring 8 sleeved on the first sealing ring 7, and the inner peripheral surface of the first sealing ring 7 is in contact with the valve The outer peripheral surface of the core 6 is attached, and the second sealing ring 8 exerts radial pressure on the first sealing ring 7 so that the first sealing ring 7 is in close contact with the valve core 6. The outer peripheral surface of the first sealing ring 7 is also provided with The positioning groove 71 for accommodating the first sealing ring 7 . Because the spool 6 is movable, the side wall of the spool 6 is provided with a liquid passage hole, and the first sealing ring 7 and the second sealing ring 8 that are matched are arranged between the spool 6 and the valve sleeve 5. The first sealing structure is formed. The first sealing ring 7 is a special-shaped ring with a positioning groove 71 on the outer peripheral surface. When the pressure liquid enters the inner cavity of the valve core 6 to make the valve core 6 push the spring seat 3 to move, the pressure liquid At the same time, it enters the liquid passage hole of the valve core 6. When the valve core 6 moves to align the liquid passage hole with the first sealing ring 7, the pressure liquid will erode the inner peripheral surface of the first sealing ring 7, and the first sealing ring will be eroded. The pressure generated by the ring 7 will further cause the first sealing ring 7 to expand in the radial direction, and the second sealing ring 8 is embedded in the positioning groove 71 to form a squeeze on the first sealing ring 7 to prevent the expansion of the first sealing ring 7 , so that the first sealing ring 7 is in closer contact with the valve core 6, and the erosion of the inner peripheral surface of the first sealing ring 7 by the pressure liquid overflowing from the liquid passage hole of the valve core 6 is weakened, thereby improving the sealing structure. The reliability and service life of the seal can be improved, and finally the sealing performance can be improved.

Specifically, the first sealing ring 7 is a special-shaped ring made of nylon, preferably high-strength nylon. The first sealing ring 7 of nylon has the advantages of high strength, high precision and good wear resistance, and has a high service life and sealing effect. The second sealing ring 8 is an O-ring made of rubber and has certain elasticity. As shown in Figure 5 and Figure 7, the first sealing ring 7 is a circular ring, and its inner peripheral surface is a cylindrical surface in contact with the valve core 6, and the width of the first sealing ring 7 in the axial direction is greater than that of the second sealing ring 8 Width, the outer diameter of the first sealing ring 7 is smaller than the outer diameter of the second sealing ring 8 , and the outer diameter of the first sealing ring 7 is larger than the inner diameter of the second sealing ring 8 . The positioning groove 71 is an annular positioning groove extending along the entire circumferential direction on the outer peripheral surface of the first sealing ring 7, and the longitudinal section shape of the positioning groove 71 is arc-shaped, and its radian is about 120 degrees, so as to adapt to the second sealing ring. 8 shapes. The minimum diameter at the positioning groove 71 of the first sealing ring 7 is approximately the same as or slightly larger than the inner diameter of the second sealing ring 8 , so that the second sealing ring 8 can be aligned with the first sealing ring 7 Close contact. The first sealing ring 7 and the second sealing ring 8 form a composite sealing structure, and the second sealing ring 8 exerts pressure on the first sealing ring 7 so that the first sealing ring 7 and the valve core 6 are reliably sealed.

Preferably, the sealing structure of the valve core assembly further includes a second sealing structure provided between the valve core 6 and the valve sleeve 5 . As shown in Figure 1 and Figure 6, the second sealing structure is the same as the first sealing structure, which is also composed of the above-mentioned first sealing ring 7 and second sealing ring 8, and has the same use effect as the first sealing structure, but according to Where the first sealing structure and the second sealing structure are located, the size of the two sealing rings of the first sealing structure is different from the size of the two sealing rings of the second sealing structure. The first sealing structure is located at the position where the valve sleeve 5 is inserted into the valve casing 9, close to the second liquid hole 52, the second sealing structure is located at the position where the valve sleeve 5 is inserted into the joint 4, and the second sealing structure It is located between the first liquid passage hole 51 and the end surface of the valve sleeve 5 . Since the valve sleeve 5 is provided with liquid passage holes at two places along the axial direction, the corresponding valve core 6 must be provided with at least two places along the axial direction which are respectively connected with the first liquid passage hole 51 and the second liquid passage hole 52 on the valve sleeve 5. Accordingly, a first sealing structure and a second sealing structure are provided between the valve sleeve 5 and the valve core 6, thereby further improving the sealing performance of the safety valve sealing structure and improving the sealing effect.

As shown in Fig. 1 and Fig. 2, the inner cavity for housing the valve core 6 set in the center of the valve sleeve 5 of the safety valve is a stepped hole extending from one end face to the other end face along the axial direction of the valve sleeve 5. The body includes a large-diameter chamber 53 communicating with the first liquid passage hole 51 and a small-diameter chamber 55 communicating with the second liquid passage hole 52 . The diameter of the large-diameter chamber 53 is greater than the diameter of the small-diameter chamber 55 . The first liquid passage hole 51 is arranged on the side wall surrounding the large-diameter chamber 53 of the valve sleeve 5, the first liquid passage hole 51 is a circular hole penetrating through the side wall of the valve sleeve 5, and the first liquid passage hole 51 is in the valve sleeve. 5 The position of the unloading hole 43 facing outward on the side wall extends obliquely, that is, the axis of the first liquid passage 51 intersects the axis of the valve sleeve 5, and the angle between the two is less than 90 degrees. The unloading hole of the joint 4 43 is facing the first liquid hole 51. The second liquid hole 52 is arranged on the side wall surrounding the small-diameter chamber 55 of the valve sleeve 5. The second liquid hole 52 is a circular hole that runs through the side wall of the valve sleeve 5, and the axis of the second liquid hole 52 is in line with the valve. The axis of cover 5 is vertical.

As shown in Figure 2, the inner cavity of the valve sleeve 5 also includes a medium-diameter cavity 54 between the large-diameter cavity 53 and the small-diameter cavity 55. The diameter of the large-diameter cavity 53, the middle-diameter cavity 54 and the small-diameter cavity 55 are coaxial. In the valve sleeve 5, the middle diameter cavity 54 and the large diameter cavity 53 form a first inner wall surface 516, a second inner wall surface 517 is formed between the small diameter cavity 55 and the middle diameter cavity 54, the first inner wall surface 516 and the second inner wall surface The wall surface 517 is a circular plane perpendicular to the axis of the valve sleeve 5 . In addition, the length of the large-diameter cavity 53 is the largest, the length of the small-diameter cavity 55 is next, and the length of the medium-diameter cavity 54 is the smallest.

As shown in Figures 1 and 3, the spool 6 of the safety valve includes a large-diameter body 64 inserted into the large-diameter cavity 53 of the valve sleeve 5 and a small-diameter body 65 inserted into the small-diameter cavity 55 of the valve sleeve 5, the large-diameter body 64 and small diameter body 65 are cylindrical. The outer diameter of the large-diameter body 64 is equal to the diameter of the large-diameter cavity 53, the outer diameter of the small-diameter body 65 is equal to the diameter of the small-diameter cavity 55, and the first sealing ring 7 of the first sealing structure is sleeved on the small-diameter body 65. The first sealing ring 7 of the two-sealing structure is sleeved on the large-diameter body 64 . The large-diameter body 64 and the small-diameter body 65 are coaxial and integrally processed to form the spool 6 of an integral structure. Since the outer diameter of the large-diameter body 64 is greater than the outer diameter of the small-diameter body 65, the large-diameter body 64 and the small-diameter body 65 The connected end surfaces form a stop surface 69 , which is a circular plane parallel to and adjacent to the first inner wall surface 516 . In the large-diameter cavity 53 of the valve sleeve 5 , the space between the first inner wall surface 516 and the stop surface 69 is a balance cavity 56 .

As shown in Figure 3, the large-diameter body 64 of the spool 6 is provided with a third fluid hole 61 for communicating with the large-diameter cavity 53 and the inner cavity of the spool 6, and the small-diameter body 65 is provided with a small-diameter body 65 for communicating with the small-diameter cavity 55 and the inner cavity of the valve core 6. The fourth liquid passage hole 62 of the inner cavity of the valve core 6 is also provided with a fifth liquid passage hole 63 for communicating with the large diameter chamber 53 and the inner cavity of the valve core 6 on the small diameter body 65, and the fifth liquid passage hole 63 is located at Between the fourth liquid passage hole 62 and the stop surface 69 of the large diameter body 64, the fifth liquid passage hole 63 is closer to the stop surface 69, that is, the fifth liquid passage hole 63 can connect the balance chamber 56 to the valve core 6 The inner cavity is connected.

As shown in Figure 3, the inner cavity of the valve core 6 includes a large-diameter hole 66, a middle-diameter hole 67 and a small-diameter hole 68 arranged in sequence along the axial direction and the diameter gradually decreases, and the large-diameter hole 66, the middle-diameter hole 67 and the small-diameter hole The three holes 68 are coaxial and coaxial with the valve core 6 , and the large-diameter hole 66 faces the working port 41 of the joint 4 and communicates with the working port 41 . The large-diameter hole 66 and the middle-diameter hole 67 are located in the large-diameter body 64 of the valve core 6, and the small-diameter hole 68 is located in the small-diameter body 65 of the valve core 6. The axial direction extends for a certain distance toward the inside of the small-diameter body 65 , but does not penetrate the small-diameter body 65 . The diameters of the large-diameter hole 66 , the middle-diameter hole 67 and the small-diameter hole 68 gradually decrease, so as to have a damping effect on the pressure liquid flowing into the valve core 6 , slow down the flow velocity of the pressure liquid, and reduce the hydraulic shock. The third liquid hole 61 communicates with the large-diameter hole 66 , the third liquid hole 61 is a round hole penetrating through the side wall of the valve core 6 , and the axis of the third liquid hole 61 is perpendicular to the axis of the valve core 6 . The fourth liquid passage hole 62 and the fifth liquid passage hole 63 communicate with the small-diameter hole 68, the fourth liquid passage hole 62 and the fifth liquid passage hole 63 are circular holes penetrating through the side wall of the valve core 6, and the fourth liquid passage hole 62 The axis of the fifth liquid passage hole 63 is perpendicular to the axis of the spool 6 .

The third liquid passage hole 61, the fourth liquid passage hole 62 and the fifth liquid passage hole 63 are evenly distributed along the circumferential direction on the side wall of the valve core 6, and the fifth liquid passage hole 63 is located between the third liquid passage hole 61 and the fifth liquid passage hole. There is a certain distance between the four liquid passage holes 62 and the third liquid passage hole 61 and the fourth liquid passage hole 62 respectively. The length of the spool 6 is greater than the length of the valve sleeve 5. When the safety valve is in the closed state as shown in Figure 1, one end of the spool 6 extends out of the valve sleeve 5 and is inserted into the unloading chamber 42 of the joint 4, and the rest is inserted into the valve In the inner cavity of set 5. The length of the inner cavity of the valve core 6 is less than the length of the inner cavity of the valve sleeve 5, and in the axial direction of the safety valve, the distance between the axis of the third fluid hole 61 and the axis of the fourth fluid hole 62 is greater than The distance between the axis of the first liquid passage hole 51 and the axis of the second liquid passage hole 52 , the fifth liquid passage hole 63 communicates the balance chamber 56 with the small-diameter hole 68 in the valve core 6 .

The diameter of the third liquid passage hole 61 on the spool 6 is larger than the diameters of the fourth liquid passage hole 62 and the fifth liquid passage hole 63, the fifth liquid passage hole 63 is slightly larger than the fourth liquid passage hole 62, and the fifth liquid passage hole 63 is slightly larger than the fourth liquid passage hole 62. The third liquid hole 61 , the fourth liquid hole 62 and the fifth liquid hole 63 have small diameters and are smaller than the small diameter hole 68 , which are small damping holes that have a damping effect on the pressure liquid flowing through. The fifth fluid hole 63 is used to fill the balance chamber 56 with pressure liquid. When the pressure liquid flowing in from the working port 41 of the joint 4 enters the inner cavity of the valve core 6 to push the valve core 6 to move, a part of the pressure liquid will First, it flows into the balance chamber 56 through the fifth liquid passage hole 63, and the pressure liquid in the balance chamber 56 will generate resistance to the valve core 6, which largely relieves the hydraulic shock of the valve core 6 opening instantly, and reduces the pressure of the valve core 6. The axial pressure on the spring seat 3 makes the opening of the safety valve stable in time, well protects the seal and other parts of the safety valve, and greatly increases the service life of the safety valve.

As shown in Figure 1, in the middle diameter chamber 54 of valve sleeve 5, also be provided with the screw sleeve 10 that is threadedly connected with valve sleeve 5, the outer surface of screw sleeve 10 is provided with external thread, the middle diameter chamber 54 of valve sleeve 5 The inner wall of the inner wall is correspondingly provided with an internal thread, the screw sleeve 10 is fixed in the valve sleeve 5, the first sealing structure is adjacent to the position of the screw sleeve 10, and the screw sleeve 10 can limit the first sealing structure in the axial direction on the one hand, and on the other hand On the one hand, it facilitates the installation of the first sealing structure. By screwing the screw sleeve 10 into the middle-diameter cavity 54, the screw sleeve 10 will push the two sealing rings of the first sealing structure into the first inner groove in the valve sleeve 5 58, so that the first sealing structure can be installed quickly and conveniently. The center of the screw sleeve 10 is also provided with a through hole for the small-diameter body 65 of the valve core 6 to pass through, and the diameter of the through-hole is equal to the outer diameter of the small-diameter body 65 .

As shown in Figure 1 and Figure 2, the outer diameter of the valve sleeve 5 located in the valve casing 9 is smaller than the outer diameter of the valve sleeve 5 located in the joint 4, and the two ends of the valve sleeve 5 are respectively equipped with A first outer groove 512 and a second outer groove 513 are provided for sealing rings, and a third outer groove 514 is provided on the outer circumferential surface of the valve sleeve 5 located in the joint 4, and the third outer groove 514 The groove 514 is an annular groove extending circumferentially on the outer peripheral surface of the valve sleeve 5, and the third outer groove 514 communicates with the first liquid passage hole 51, and the third outer groove 514 makes the first liquid passage hole 51 communicates with the unloading cavity 42 and the unloading hole 43 . A third outer groove 514 is provided on the valve sleeve 5, thereby forming an annular stopper 515 on the valve sleeve 5, which is adjacent to the valve housing 9 and limits the axial direction of the valve sleeve 5. There is a certain distance between the position block 515 and the end surface of the valve housing 9 , and there is a certain distance between the outer peripheral surface of the limit block 515 and the inner peripheral surface of the joint 4 in the radial direction of the valve sleeve 5 . On the outer circumferential surface of the valve sleeve 5 at the position in the valve housing 9, there is also a liquid passage 57 communicated with the second liquid passage 52, and the liquid passage 57 is formed along the entire The annular groove extending in the circumferential direction passes through the liquid groove 57 and extends axially from the second liquid passage hole 52 to the limit block 515 along the valve sleeve 5 . A fluid groove 57 is arranged on the valve sleeve 5, so that a gap for pressure liquid to pass is formed between the valve sleeve 5 and the inner peripheral surface at the end of the valve casing 9, and the pressure liquid flowing out from the second liquid passage hole 52 will enter the passage. In the liquid tank 57 , the pressurized liquid entering the liquid tank 57 will flow to the unloading hole 43 through the gap between the limiting block 515 and the inner peripheral surfaces of the valve housing 9 and the joint 4 . By arranging the liquid passage groove 57, the pressure liquid flowing out from the second liquid passage hole 52 is directed to the unloading cavity 42 and the unloading hole 43 of the joint 4 to be discharged, and there is no need to connect the second liquid passage hole 52 on the joint 4 or the valve casing 9. An unloading hole communicating with the second liquid passage hole 52 is provided at the corresponding position, so that the structure of the valve housing 9 and the joint 4 can be simplified, materials can be saved, processing can be facilitated, and costs can be reduced.

During the opening process of the safety valve, when the fourth liquid passage hole 62 on the valve core 6 passes through the first sealing structure, a small part of the pressure liquid passes through the fourth liquid passage hole 62 on the valve core 6 and the first liquid passage hole on the valve sleeve 5. The second liquid passage hole 52, the liquid passage groove 57 and the unloading cavity 42 flow to the unloading hole 43. When the third liquid passage hole 61 on the valve core 6 passes through the second sealing structure, most of the pressure liquid passes through the third liquid passage. The hole 61, the first liquid passage hole 51 on the valve sleeve 5 and the unloading cavity 42 flow to the unloading hole 43, and the pressure liquid entering the valve core 6 is divided into two paths through the third liquid passage hole 61 and the fourth passage respectively. The liquid hole 62 flows to the liquid passage hole on the valve sleeve 5 and the unloading cavity 42 of the joint 4 , and is finally discharged from the unloading hole 43 . The pressure liquid is discharged in two ways, which can reduce the hydraulic shock on the one hand and increase the unloading speed on the other hand.

As shown in Figure 1 and Figure 9, a limit step is provided in the inner hole of the valve casing 9, thereby forming a step surface 91 for limiting one end of the valve sleeve 5 in the axial direction, the valve sleeve 5 The other end is limited by the joint 4, the valve sleeve 5 is inserted into the valve housing 9, and is not directly connected with the valve housing 9, and is covered by the joint 4, and the valve sleeve 5 is finally fixed by tightening the joint 4.

The sealing structure of the safety valve core assembly also includes a third sealing ring 13 sleeved on the small diameter body 65 of the valve core 6, a fourth sealing ring 14 sleeved on the large diameter body 64 of the valve core 6, a fourth sealing ring 14 sleeved on the valve sleeve The fifth sealing ring 15 and the sixth sealing ring 16 on the 5, the third sealing ring 13, the fourth sealing ring 14, the fifth sealing ring 15 and the sixth sealing ring 16 are all O-rings made of rubber . The third sealing ring 13 and the fourth sealing ring 14 are used for the sealing between the valve sleeve 5 and the valve core 6, and the fourth sealing ring 14 and the fifth sealing ring 15 are used for the valve sleeve 5 and the valve housing 9 and the joint 4 seal between. As shown in Figure 2 and Figure 12, in order to facilitate the setting of the sealing rings of the sealing structure, the valve sleeve 5 is respectively provided with a first inner groove 58 for accommodating the first sealing structure and a second inner groove for accommodating the second sealing structure. The second inner groove 59, the third inner groove 510 for accommodating the third sealing ring 13 and the fourth inner groove 511 for accommodating the fourth sealing ring 14 are provided on the outer peripheral surface of the valve sleeve 5 The first outer groove 512 is used to accommodate the fifth sealing ring 15 , and the second outer groove 513 is used to accommodate the sixth sealing ring 16 .

Specifically, the first inner groove 58 and the third inner groove 510 are annular grooves extending circumferentially on the inner peripheral surface of the small-diameter cavity 55 of the valve sleeve 5, and the first inner groove 58 and the third inner groove The inner groove 510 is located on both sides of the second liquid passage hole 52, and the first inner groove 58 extends axially to the second inner wall surface 517 in the middle diameter cavity 54, so that the two sides of the first sealing structure Installation of a sealing ring.

The second inner groove 59 and the fourth inner groove 511 are annular grooves extending circumferentially on the inner peripheral surface of the large-diameter cavity 53 of the valve sleeve 5, and the second inner groove 59 and the fourth inner groove 511 are located on both sides of the first liquid passage hole 51, and the second inner groove 59 extends axially to the end surface of the valve sleeve 5, so as to facilitate the installation of the two sealing rings of the second sealing structure.

The first outer groove 512 and the second outer groove 513 are annular grooves extending circumferentially on the outer peripheral surface of the valve sleeve 5, the first outer groove 512 is located in the valve housing 9, and the first outer groove 512 And between the second liquid hole 52 and the end face of the end of the valve sleeve 5 inserted into the valve casing 9, the second outer groove 513 is located in the joint 4, the second outer groove 513 and the third outer groove 514 The position is adjacent, and the second outer groove 513 extends to the end surface of the valve sleeve 5 in the axial direction.

The third sealing ring 13 and the fourth sealing ring 14 are arranged in the third inner groove 510 and the fourth inner groove 511, so that the sealing performance between the valve sleeve 5 and the valve core 6 can be improved. 512 and the second outer groove 513 are provided with the fifth sealing ring 15 and the sixth sealing ring 16, so as to improve the sealing performance between the valve sleeve 5, the valve housing 9 and the joint 4.

A fifth inner groove 518 is arranged on the inner peripheral surface of the large-diameter chamber 53 of the valve sleeve 5 corresponding to the first liquid passage hole 51, and a fifth inner groove 518 is arranged on the inner peripheral surface of the small-diameter chamber 55 of the valve sleeve 5 corresponding to the second hole. A sixth inner groove 519 is provided at the liquid passage hole 52, the fifth inner groove 518 and the sixth inner groove 519 are both annular grooves, the fifth inner groove 518 communicates with the first liquid passage hole 51, The sixth inner groove 519 communicates with the second liquid passage hole 52 . The width of the fifth inner groove 518 is greater than the diameter of the first liquid passage hole 51 , and the width of the sixth inner groove 519 is greater than the diameter of the second liquid passage hole 52 .

As shown in Figure 9 and Figure 11, the spring seat 3 of the reset mechanism of the safety valve is composed of a guide section 32, a first boss 31 and a second boss 33, the guide section 32 is a circular block structure, the first The boss 31 and the second boss 33 are respectively connected to the guide section 32 on one side of the guide section 32 to form a spring seat 3 with an integral structure. The first boss 31 and the second boss 33 are coaxial with the guide section 32, the first boss 31 is cylindrical, the second boss 33 is spherical, and the second boss 33 is a small-diameter cavity for inserting the valve sleeve 5 55 is in contact with the end face of the spool 6 to push the spool 6 to move or bear the force exerted by the spool 6. The end face of the small-diameter body 65 of the spool 6 in contact with the second boss 33 is a plane perpendicular to its axis. The return spring 2 is a coil spring, and the first boss 31 is used for inserting into the return spring 2 to position one end of the return spring 2 . The diameter of the guide section 32 is larger than the diameter of the first boss 31, and the outer peripheral surface of the guide section 32 is an arc-shaped surface, which has good guiding performance. The outer diameter of the guide section 32 is slightly smaller than the inner diameter of the valve casing 9 , and there is a gap between the guide section 32 and the valve casing 9 .

As shown in Figures 9 and 10, the pressure regulating screw 1 includes a threaded section 11 connected to the valve casing 9 and a third boss 12 protruding from the threaded section 11, and the threaded section 11 is provided with threads on the outer circumference. Cylindrical structure, correspondingly provided with internal threads on the inner peripheral surface of the end of the valve housing 9, the third boss 12 is cylindrical with the same diameter as the first boss 31, and the third boss 12 is coaxial with the threaded section 11 . The third boss 12 is used to insert the other end of the back-moving spring 2 into the back-moving spring 2 to locate the other end. By arranging the first boss 31 and the third boss 12, the axial positioning of the back-moving spring 2 can be made more reliable. The spring 2 in the valve casing 9 will not be bent and tilted, and will not be displaced in the radial direction, which improves the guiding performance of the return spring 2 and ensures better axial force of the return spring 2 .

As shown in Figure 9, the center of the third boss 12 on the pressure regulating screw 1 is provided with a vent hole 17, and the center of the threaded section 11 is provided with an inner hexagonal hole 18 communicating with the vent hole 17, and the vent hole 17 is along the The circular hole extending axially to the end face of the third boss 12, the aperture of the vent hole 17 is smaller, the inner hexagonal hole 18 extends axially to the end face of the threaded section 11, and the inner hexagonal hole 18 is used for inserting a wrench to screw Move the pressure regulating screw 1. Since the valve core assembly on one side of the spring seat 3 and the valve casing 9 are sealed by the fifth sealing ring 15, the vent hole 17 communicates with the inner hexagonal hole 18, so that the space where the reset mechanism in the valve casing 9 inner hole is located can be separated from the outside world. Connected, so that the space where the reset mechanism is located is non-airtight, ensuring that the spring seat 3 can move back and forth.

The nominal pressure of the safety valve with the above structure is 50MPa, the nominal flow rate is 1000L/min, and the pressure liquid is emulsion.

The utility model has been exemplarily described above in conjunction with the accompanying drawings. Apparently, the specific implementation of the present invention is not limited by the above methods. As long as the various insubstantial improvements made by adopting the method concept and technical solution of the present utility model; within the scope of protection.

Claims (10)

1. a safety valve, comprise valve casing, valve pocket, spool and joint, joint is provided with working hole and unloading hole, spool is provided with the inner chamber body be communicated with the working hole of joint, it is characterized in that: described valve pocket one end is inserted in described joint, the other end inserts in described valve casing, the position that valve pocket is positioned at joint is provided with the first liquid pass hole be communicated with described unloading hole, the position that valve pocket is positioned at valve casing is provided with the second liquid pass hole be communicated with unloading hole, described spool to insert in valve pocket and and be provided with the first hermetically-sealed construction between valve pocket, first hermetically-sealed construction is between the first liquid pass hole and the second liquid pass hole, first hermetically-sealed construction comprises the first sealing ring be enclosed within spool and the second sealing ring be enclosed within the first sealing ring, the outer circumference surface of the first sealing ring is provided with the locating slot of accommodation first sealing ring.

2. safety valve according to claim 1, is characterized in that: described locating slot is along the annular positioning groove that whole circumference extends on the outer circumference surface of described first sealing ring, and the vertical sectional shape of locating slot is arc.

3. safety valve according to claim 1 and 2, is characterized in that: be provided with second hermetically-sealed construction identical with described first hermetically-sealed construction between described spool with described valve pocket.

4. safety valve according to claim 3, it is characterized in that: the position of the described valve casing of insertion that described first hermetically-sealed construction is positioned at described valve pocket, the position of the described joint of insertion that described second hermetically-sealed construction is positioned at valve pocket, and the second hermetically-sealed construction is between described first liquid pass hole and the end face of valve pocket.

5. safety valve according to claim 4, it is characterized in that: be provided with in described valve pocket and hold described spool and the inner chamber body extending to other end vertically from an end face, inner chamber body comprises the chamber, large footpath be communicated with described first liquid pass hole and the path chamber be communicated with described second liquid pass hole, and the diameter in chamber, large footpath is greater than the diameter in path chamber.

6. safety valve according to claim 5, it is characterized in that: described spool comprises the large footpath body inserted in chamber, described large footpath and the path body inserted in described path chamber, large footpath body is provided with the 3rd liquid pass hole for being communicated with chamber, large footpath and valve core cavity body, and path body is provided with the 4th liquid pass hole for being communicated with path chamber and valve core cavity body.

7. safety valve according to claim 6, it is characterized in that: the inner chamber body of described valve pocket also comprises the central diameter chamber between described chamber, large footpath and described path chamber, and be provided with valve pocket in central diameter chamber to be the swivel nut be threaded, in swivel nut, to be provided with the hole allowing the path body of described spool pass.

8. safety valve according to claim 7, is characterized in that: the path body of described spool is provided with the 5th liquid pass hole for being communicated with described chamber, large footpath and valve core cavity body, and the 5th liquid pass hole is between described 4th liquid pass hole and the end face of described large footpath body.

9. safety valve according to claim 8, it is characterized in that: the inner chamber body of described spool comprise set gradually vertically and aperture reduce gradually hole, large footpath, central diameter hole and diameter holes, described 3rd liquid pass hole is communicated with hole, large footpath, and described 4th liquid pass hole is communicated with diameter holes with described 5th liquid pass hole.

10. safety valve according to claim 9, is characterized in that: the outer circumference surface being positioned at the position of described valve casing of described valve pocket be provided be communicated with described second liquid pass hole cross liquid bath, cross liquid bath between described first liquid pass hole and the second liquid pass hole.