CN204828710U - Big adjustable control valve that compares of low discharge - Google Patents

Abstract

The utility model relates to a control valve with a small flow rate and a large adjustable ratio, which includes a valve body, a medium inlet and a medium outlet respectively set in the valve body, the valve body and the valve cover are sealed and connected by fasteners, and a valve is also set inside the valve body. Cavity, valve seat and sleeve are respectively installed in the valve cavity, a valve core installation hole is opened in the valve seat, the large valve core is installed in the valve core installation hole, the large valve core is threaded with the valve core sleeve, and the valve The rod extends into the inside of the valve cover, and it passes through the valve core sleeve through the small valve core and connects with the through hole inside the large valve core. spring. The utility model has a simple structure and adopts a combination of large and small valve cores to replace the original scheme of two sets of valve structures, so that a small flow rate and a large adjustable ratio can be realized through one valve, which can directly reduce the user's investment cost by 70%, and meet the small flow rate. A wide range of adjustment to large flow not only meets the needs of use, but also prolongs the service life of the equipment.

Description

Small Flow Large Adjustable Ratio Control Valve

technical field

The utility model relates to the field of control valves, in particular to a control valve with a small flow rate and a large adjustable ratio which can not only aim at a small flow rate but also regulate the flow rate in a wide range.

Background technique

At present, for the control valve structure with small flow rate and large adjustable ratio, domestic and foreign manufacturers use two sets of valve structures to solve the problem, that is, use a small flow valve to control small flow rate, use a large flow valve to control large flow rate, and implement main-by-side control valve structure. At the same time, the small flow valve meets the requirements of flow characteristics by modifying the shape of the needle-shaped valve core. The size of the above-mentioned needle-shaped valve core is generally only 1-2mm. Flow valve requirements, but the following disadvantages will appear in the actual use process: due to the small size of the needle valve core, it is easy to break the valve core in the actual application process, in addition, due to the small size of the valve core, the fluid in The flow rate at the spool is fast, and it is easy to cause destructive erosion to the needle spool, thereby destroying the needle spool and making its adjustment accuracy worse. At the same time, the investment cost, pipeline cost and equipment investment cost of the valve also increase to a certain extent.

In order to improve the domestic technical level of valves in this situation, and also for our company to quickly enter this high-end field, our company has designed a unique structure through creative design, so that the original problems can be completely eliminated, and the existing problems can be fundamentally solved. Problems, not only meet the use requirements, but also prolong the service life.

Utility model content

In view of the above existing problems, the applicant has carried out research and improvement, and provided a control valve with small flow rate and large adjustable ratio, which can realize large adjustable ratio and small flow rate through one valve, which greatly saves the user's investment cost and not only meets the use requirements , also prolongs the service life.

The technical scheme adopted in the utility model is as follows:

A control valve with a small flow rate and a large adjustable ratio includes a valve body, a medium inlet and a medium outlet are set in the valve body respectively, the valve body and the valve cover are sealed and connected by fasteners, and the inside of the valve body is also set The valve cavity, the valve seat and the sleeve are respectively installed in the valve cavity, and a valve core installation hole is opened in the valve seat, and the large valve core is installed in the valve core installation hole, and the large valve core and the valve core The valve stem extends into the inside of the bonnet, which passes through the spool sleeve through the small spool and connects with the through hole inside the large spool. The small spool is integrally formed on one end of the valve stem, and The outer end of the valve rod is also sleeved with a spring.

As a further improvement of the above technical solution:

The top of the sleeve is in contact with the bottom of the valve cover, the bottom of the sleeve is in contact with the top of the valve seat, and several through holes are opened along the wall of the sleeve;

The upper end of the spring extends into the upper positioning groove of the valve cover and abuts against the bottom of the positioning groove, and the lower end of the spring is embedded in the positioning ring groove on the upper surface of the valve core sleeve;

A large valve core upper cavity is also provided in the valve core sleeve for the valve stem to pass through. The outer circumference of the valve stem is in sealing and sliding fit with the large valve core upper cavity. The through hole inside the large valve core is formed from The through hole of the spool and the lower chamber of the large spool opened in sequence from top to bottom, the through hole of the spool and the lower chamber of the large spool axially penetrate the large spool, the upper chamber of the large spool, the through hole and the lower cavity of the large spool are connected to each other and arranged coaxially, and the small spool cooperates with the through hole of the spool;

A bushing seat is also arranged in the upper chamber of the large valve core, the inner ring of the bushing seat presses the soft sealing bush, and the soft sealing bush is pressed and fitted on the outer periphery of the small valve core;

At one end of the small spool, set a "V" shaped beveled groove along the axial direction of the small spool, and the bottom center line L2 of the "V" shaped beveled groove is along the upper end of the small spool It is inclined to the lower end, so that the groove depth of the "V"-shaped beveled groove increases gradually from the upper end to the lower end of the small valve core. An included angle α is formed, the angle range of said α is 4°～40°, and an included angle β is formed between the left and right inner sidewalls of said “V”-shaped beveled groove;

At one end of the valve stem extending into the valve cover, a packing liner and a packing gland are also arranged on the outer periphery of the valve stem, and a packing is arranged between the packing liner and the packing gland, and the packing gland and the The packing gland abuts, and the packing gland is affixed to one end of the valve cover through fasteners;

The valve core sleeve is also provided with a medium inflow hole, and the outer peripheral wall of the valve core sleeve is in sealing and sliding fit with the inner hole wall of the sleeve.

The beneficial effects of the utility model are as follows:

The utility model is simple in structure and easy to use. It adopts a structure combining large and small valve cores to replace the original scheme of two sets of valve structures, so that a small flow rate and a large adjustable ratio can be realized through one valve, which can directly reduce the user's investment cost by 70%. Satisfy the wide range of adjustment from small flow rate to large flow rate. When the small spool moves, the big spool exerts sealing pre-tightening force through the spring, so as to ensure the closing of the big spool when the small spool moves and ensure the leakage level. When the small spool is fully When it is opened, the small valve core and the large valve core are driven by the valve stem to move the compression spring, so as to realize the adjustment of large flow rate. The minimum flow rate solves the problem of poor adjustment accuracy of the original needle valve core, which not only meets the needs of use, but also prolongs the service life of the equipment.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the utility model.

Fig. 2 is a schematic structural view of the medium and small spool of the utility model.

FIG. 3 is a schematic cross-sectional structural diagram of FIG. 2 along the B direction.

FIG. 4 is a schematic diagram of the enlarged structure at A in FIG. 1 .

Fig. 5 is a structural schematic diagram of a large valve core in the utility model.

Among them: 1. Valve body; 1a, medium inlet; 1b, medium outlet; 2, valve seat; 3, sleeve; 4, large valve core; 4a, large valve core upper cavity; 4b, valve core through hole; 4c, 5, small spool; 6, spool cover; 6a, medium inflow hole; 601, positioning ring groove; 7, valve cover; 701, upper positioning groove; 8, spring; 9, the first six Angle nut; 10. First stud bolt; 11. Packing gasket; 12. Packing; 13. Packing gland; 14. Packing gland; 15. Second stud bolt; 16. Second hex nut; 17 1, the first O-ring; 18, the second O-ring; 19, the valve stem; 20, the valve cover gasket; 21, the bush seat; 22, the sealing soft bush; 23, the valve seat gasket.

Detailed ways

Below in conjunction with accompanying drawing, illustrate the specific embodiment of the present utility model.

As shown in Figure 1, the control valve with small flow rate and large adjustable ratio includes a valve body 1, the medium inlet 1a and the medium outlet 1b are respectively opened in the valve body 1, and the valve body 1 and the valve cover 7 pass through the first stud 10 and the second A hexagonal nut 9 is sealed and connected, and a valve chamber is also provided inside the valve body 1. The valve seat 2 and the sleeve 3 are respectively installed in the valve chamber. The bottom of the valve seat 2 is provided with a valve seat gasket 23. The bottom of the valve cover 7 is in contact with each other, the bottom of the sleeve 3 and the top of the valve seat 2 are in contact with each other, and several through holes are opened along the wall of the sleeve 3 . A spool installation hole is set in the above-mentioned valve seat 2, the large spool 4 is installed in the spool installation hole, the large spool 4 is threaded with the spool sleeve 6, and the outer peripheral wall of the spool sleeve 6 is connected to the inner hole of the sleeve 3 The wall is sealed and slidingly matched, and the medium inflow hole 6a is set on the valve core sleeve 6. The position of the valve core sleeve 6 can be rotated and adjusted, and the stroke of the large valve core 4 can be adjusted according to the actual application, which broadens the scope of application of the utility model. The valve stem 19 stretches into the inside of the valve cover 7, and it passes through the valve core sleeve 6 through the small valve core 5 and is connected with the through hole inside the large valve core 4. The outer end of 19 is also socketed with spring 8, the upper end of spring 8 stretches into the upper positioning groove 701 of valve cover 7, and abuts against the groove bottom of positioning groove 701, and the lower end of spring 8 is embedded in the positioning ring on the upper surface of valve core cover 6 In the groove 601, the arrangement of the upper positioning groove 701 and the positioning ring groove 601 can stabilize the position of the spring 8, thereby improving the stability of the control valve during operation. As shown in FIG. 1 , the medium inlet 1 a of the valve body communicates with the external space of the valve seat 2 and the sleeve 3 , and the medium outlet 1 b communicates with the lower end of the valve seat installation hole.

As shown in Figure 5, a large valve core upper cavity 4a for the valve stem 19 to penetrate is also provided in the valve core sleeve 6, and the outer circumference of the valve stem 19 is in sealing and sliding fit with the large valve core upper cavity 4a. The through hole is composed of the spool through hole 4b and the large spool lower cavity 4c which are opened sequentially from top to bottom. 4a, the spool through hole 4b and the large spool lower cavity 4c are connected to each other and coaxially arranged, and the small spool 5 and the spool through hole 4b cooperate with each other. As shown in Figure 4, a bushing seat 21 is arranged in the upper cavity 4a of the large valve core, the inner ring of the bushing seat 21 presses the soft sealing bush 22, and the soft sealing bush 22 is pressed and fitted on the small valve core 5. peripheral.

As shown in Figure 2 and Figure 3, a "V"-shaped beveled groove is set at one end of the small valve core 5 along the axial direction of the small valve core 5, and the center line L2 of the bottom of the "V"-shaped beveled groove is along the direction of the small valve core. The upper end of the core 5 is inclined to the lower end, so that the groove depth of the "V"-shaped beveled groove increases gradually along the upper end to the lower end of the small valve core 5, and the bottom center line L2 of the "V"-shaped beveled groove is formed between the horizontal line L1. The included angle α, the angle range of α is 4°-40°, and the included angle β is formed between the left and right inner sidewalls of the “V”-shaped beveled groove. As shown in Figure 1, a packing liner 11 and a packing gland 13 are also arranged on the end of the valve stem 19 extending into the valve cover 7, and a packing gasket 11 and a packing gland 13 are arranged on the outer periphery of the valve stem 19, and a packing is arranged between the packing gasket 11 and the packing gland 13. 12. The packing gland 14 is in contact with the packing gland 13, and the packing gland 14 is fixedly connected to one end of the valve cover 7 through the second stud bolt 15 and the second hex nut 16. In the above-mentioned packing gland 13, the A first O-ring 17 and a second O-ring 18 are provided on the outer periphery of the valve stem 19 .

Concrete work process of the present utility model is as follows:

During practical application, the small spool 5 is moved upwards driven by the valve stem 19, so that the "V" shaped beveled groove of the small spool 5 moves upward, and the groove top of the "V" shaped beveled groove of the small spool 5 is higher than Seal the central hole of the soft bushing 22 and the bushing seat 21, so that the small valve core 5 is in the open position, the medium flows in from the medium inlet 1a, enters the sleeve 8 through a number of through holes arranged on the sleeve 8, and then flows into the hole through the medium 6a enters the valve core sleeve 6, the medium flows into the large valve core upper cavity 4a and the valve core through hole 4b of the valve core sleeve 6 through the "V" shaped oblique groove, and finally flows out from the large valve core lower cavity 4c and the medium outlet , so as to achieve the purpose of controlling the small flow rate. During the action of the above-mentioned small spool 5, the pre-tightening force of the spring 8 ensures that when the small spool 5 moves, the large spool 4 is closed by force to ensure the leakage level. When the small spool 5 is in the closed position, the top of the "V"-shaped beveled groove of the small spool 5 is lower than the central hole of the sealing soft bush 22 and the bushing seat 21, and the medium flows into the "V"-shaped beveled groove When the pressure is applied to the soft sealing bush 22, the soft sealing bush 22 is compressed by force, so that the soft sealing bush 22 is compressed and tightly hugged the small valve core 5 to prevent the movement of the small valve core 5 and ensure the tightness. , so as to realize the adjustment of the small flow rate. When the small spool 5 is in the fully open position, the small spool 5 of the valve stem 22 drives the large spool 4 to move up and down, and the large spool 4 compresses the spring 8 during the up and down operation. At this time, the medium enters the valve seat 5 through the sleeve 3, and finally flows out from the valve seat installation hole of the valve seat 5 and the medium outlet 1b, so as to realize the adjustment of large flow.

The α angle and β angle of the above-mentioned "V"-shaped oblique groove are used to control the minimum flow rate of the valve body, and the sizes of the α angle and β angle are designed according to different product requirements.

The above description is an explanation of the utility model, not a limitation of the utility model. For the limited scope of the utility model, refer to the claims. Without violating the basic structure of the utility model, the utility model can be modified in any form.

Claims (8)

1. the large regulating ratio control valve of small flow, it is characterized in that: comprise valve body (1), medium inlet (1a) and media outlet (1b) are opened in described valve body (1) respectively, described valve body (1) and valve gap (7) are tightly connected by fastening piece, also valve pocket is offered in the inside of described valve body (1), valve seat (2) and sleeve (3) are installed in described valve pocket respectively, spool mounting hole is offered in described valve seat (2), big valve core (4) is installed in described spool mounting hole, described big valve core (4) is threaded with valve core housing (6), valve rod (19) stretches into the inside of described valve gap (7), it runs through valve core housing (6) by small valve core (5) and the through hole inner with big valve core (4) is connected, described small valve core (5) is integrally formed in one end of valve rod (19), spring (8) is also socketed in the outer end of described valve rod (19).

2. the large regulating ratio control valve of small flow as claimed in claim 1, it is characterized in that: the top of described sleeve (3) abuts each other with the bottom of valve gap (7), the bottom of described sleeve (3) abuts each other with the top of valve seat (2), and the wall along described sleeve (3) offers some through holes.

3. the large regulating ratio control valve of small flow as claimed in claim 1, it is characterized in that: the upper end of described spring (8) is stretched into the upper locating slot (701) of valve gap (7) and abuts against with the bottom land of described locating slot (701), the lower end of described spring (8) embeds in the positioning ring groove (601) of valve core housing (6) upper surface.

4. the large regulating ratio control valve of small flow as claimed in claim 1, it is characterized in that: in described valve core housing (6), also offer the big valve core epicoele (4a) run through for valve rod (19), the periphery of described valve rod (19) and described big valve core epicoele (4a) seal and are slidably matched, the through hole of described big valve core (4) inside is made up of the valve core through hole (4b) sequentially offered from top to bottom and big valve core cavity of resorption (4c), described valve core through hole (4b) and big valve core cavity of resorption (4c) through big valve core (4) vertically, described big valve core epicoele (4a), valve core through hole (4b) and big valve core cavity of resorption (4c) are communicated with and coaxially arranged each other, described small valve core (5) coordinates each other with described valve core through hole (4b).

5. the large regulating ratio control valve of small flow as claimed in claim 4, it is characterized in that: in described big valve core epicoele (4a), also arrange liner clamp (21), the soft lining of inner ring press seal (22) of described liner clamp (21), the soft lining of described sealing (22) compression fit is in the periphery of small valve core (5).

6. the large regulating ratio control valve of small flow as claimed in claim 3, it is characterized in that: in one end of described small valve core (5), axial direction along described small valve core (5) is offered " V " shape and to be cut sth. askew groove, the cut sth. askew bottom land centre line L 2 of groove of described " V " shape tilts along the upper end of described small valve core (5) to lower end, described " V " shape is made to cut sth. askew the groove depth of groove along upper end to the lower end of described small valve core (5) in increasing progressively, described " V " shape is cut sth. askew between the bottom land centre line L 2 of groove and horizontal line L 1 and is formed angle α, the angular range of described α is 4 ° ~ 40 °, described " V " shape cut sth. askew groove left and right madial wall between form angle β.

7. the large regulating ratio control valve of small flow as claimed in claim 1, it is characterized in that: described valve rod (19) stretch into valve gap (7) one end, in the periphery of described valve rod (19), matrix liner (11) and filler pressing sleeve (13) are also set, between described matrix liner (11) and filler pressing sleeve (13), filler (12) is set, Gland (14) abuts with described filler pressing sleeve (13), and described Gland (14) is fixed in one end of valve gap (7) by fastening piece.

8. the large regulating ratio control valve of small flow as claimed in claim 1, it is characterized in that: described valve core housing (6) is also arranged MEDIA FLOW hand-hole (6a), the periphery wall of described valve core housing (6) and the inner hole wall of sleeve (3) seal and are slidably matched.