阅读说明：本技术 一种金属硬密封小流量调节柱塞阀 (Metal hard seal small-flow regulating plunger valve ) 是由 吴志强 郑益丰 王若晖 孙日霖 吴佩 杨明明 于 2019-10-26 设计创作，主要内容包括：本发明提出了一种金属硬密封小流量调节柱塞阀,包括外阀体,所述外阀体两端分别为主进口及主出口,所述外阀体内设有内阀体使其两者间形成输送夹层,所述内阀体朝向主出口的一端封闭,所述内阀体朝向主进口的一端设有副进口并与主进口固定连接,所述内阀体靠近副进口的一端设有副出口,所述内阀体内腔设有两根沿其周向方向均布设置,且轴线与内阀体同向的导向杆,所述内阀体内还设有与导向杆滑动配合的活塞,所述外阀体上设有驱动装置,所述驱动装置设有连至内阀体的阀杆,所述阀杆上设有曲柄,所述曲柄上铰接有与活塞相连的连杆。本发明具有流量调节细腻,密封性好,且在高温下性能稳定可靠的优点。(The invention provides a metal hard sealing small-flow regulating plunger valve which comprises an outer valve body, wherein a main inlet and a main outlet are respectively arranged at two ends of the outer valve body, an inner valve body is arranged in the outer valve body, a conveying interlayer is formed between the inner valve body and the outer valve body, one end, facing the main outlet, of the inner valve body is closed, an auxiliary inlet is arranged at one end, facing the main inlet, of the inner valve body and is fixedly connected with the main inlet, an auxiliary outlet is arranged at one end, close to the auxiliary inlet, of the inner valve body, an inner cavity of the inner valve body is provided with two guide rods which are uniformly distributed along the circumferential direction of the inner valve body, the axes of the guide rods are in the same direction as those of the inner valve body, a piston in sliding fit with the guide rods is further arranged in the inner valve body, a driving device is arranged on the outer valve. The invention has the advantages of fine flow regulation, good sealing performance and stable and reliable performance at high temperature.)

1. The utility model provides a metal seals little flow control plunger valve firmly, includes the outer valve body of tube-shape, outer valve body both ends are main import and main export respectively, its characterized in that: the inner valve body which is concentric with the outer valve body and is in a cylindrical shape is arranged in the outer valve body, so that a conveying interlayer is formed between the outer valve body and the inner valve body, one end of the inner valve body facing the main outlet is positioned in the main outlet and is sealed, one end of the inner valve body facing the main inlet is provided with an auxiliary inlet and is fixedly connected with the main inlet, one end of the inner valve body close to the auxiliary inlet is provided with a plurality of auxiliary outlets which are uniformly distributed and opened along the circumferential direction, the auxiliary outlet is communicated with the conveying interlayer, at least two inner cavities of the inner valve body are uniformly distributed along the circumferential direction of the inner cavity, and the axis of the guide rod is in the same direction with the inner valve body, a piston which is in sliding fit with the guide rod is also arranged in the inner valve body, the outer valve body is provided with a driving device, the driving device is provided with a valve rod connected to the inner valve body, the valve rod is provided with a crank, and the crank is hinged with a connecting rod which is connected with the piston and is used for controlling the piston to slide in the axial range of the inner valve body provided with the auxiliary outlet.

2. A metal-to-metal sealed small flow regulating plug valve according to claim 1, wherein: the piston is cylindrical, bearing seats are arranged at positions, close to two ends, of the inner cylindrical wall of the piston, sliding sleeves in sliding fit with the guide rods are arranged on the bearing seats, and the sliding sleeves are made of antimony-impregnated graphite.

3. A metal-to-metal sealed small flow regulating plug valve according to claim 2, wherein: the piston inner wall supports there is the piston strengthening rib, the piston strengthening rib center is equipped with the cross head with connecting rod articulated, the valve rod is located the piston towards one side of main export.

4. A metal-to-metal sealed small flow regulating plug valve according to claim 1, wherein: the valve seat sealing ring is arranged on the auxiliary inlet, an annular front sealing pair is arranged between the valve seat sealing ring and the inner wall, close to the auxiliary inlet, of the inner valve body, an outer chamfer is arranged at the junction of the end face, facing the auxiliary inlet, of the piston and the outer cylindrical wall, and the front sealing pair is in contact sealing with the outer chamfer.

5. A metal-to-metal sealed small flow regulating plug valve according to claim 4, wherein: the piston is equipped with removable back sealing pair towards main export one end terminal surface, the inner wall that interior valve body was equipped with vice export is equipped with the thickening ring, the vice outer cylinder wall of back sealing is equipped with the back chamfer rather than towards main import one end juncture, when the piston was sealed with preceding sealing pair contact, back sealing pair was sealed with the contact of back chamfer.

6. A metal-to-metal sealed small flow regulating plug valve according to claim 4, wherein: one end of the inner valve body, which faces the main outlet, is sealed by arranging a tail cone cover, one end of the guide rod is fixed on the tail cone cover, and the other end of the guide rod is fixed on the valve seat sealing ring.

7. A metal-to-metal sealed small flow regulating plug valve according to claim 5, wherein: a plurality of springs which are uniformly distributed and supported along the circumferential direction of the front sealing pair are arranged between the end face of the front sealing pair, which is back to the main outlet, and the valve seat sealing ring, and the front sealing pair can push the compression springs under the extrusion of the piston to enable the front sealing pair and the rear sealing pair to realize sealing simultaneously.

8. A metal-to-metal sealed small flow regulating plug valve according to claim 7, wherein: and a metal O-shaped ring is arranged between the front sealing pair and the inner cylindrical wall at the end of the inner valve body, which is provided with the auxiliary inlet.

9. A metal-to-metal sealed small flow regulating plug valve according to claim 1, wherein: and the outer wall of the inner valve body and the inner wall of the outer valve body are supported and fixed through supporting ribs.

10. A metal-to-metal sealed small flow regulating plug valve according to claim 1, wherein: the flow of the cross section of the conveying interlayer is not less than the sum of the flow of the cross sections of the auxiliary outlets.

Technical Field

The invention relates to the field of valves, in particular to a metal hard-sealing small-flow regulating plunger valve.

Background

The large valve is difficult to adjust with small flow, when the valve is opened very little, the flow is still larger, the valve used in wind tunnel tests and other occasions is larger in flow, the flow adjusting range and precision requirements are higher, and therefore the traditional valve is difficult to effectively perform.

Under the high temperature occasion, the high temperature valve need guarantee not the jam between piston and sleeve, so need give a clearance of H1 between piston and sleeve, need 2~4mm usually, for guaranteeing the low discharge, it sets up long inclined plane to go out to seal the face in front and back, the flow area of valve in the time of the low aperture has been reduced greatly, guarantee that the valve is sealed the wearing and tearing of face nevertheless can lead to around sealing to differ in the flow control performance under the low aperture, cause one of them sealed face contact sealed back, another sealed face is not sealed completely, thereby cause the leakage, if adopt rubber seal, because operating temperature is higher, be difficult to effectively seal when high temperature operating mode 350~550 degrees centigrade.

Disclosure of Invention

Based on the problems, the invention aims to provide the metal hard-sealing small-flow-rate regulating plunger valve which is fine and smooth in flow regulation, good in sealing performance and stable and reliable in performance at high temperature.

Aiming at the problems, the following technical scheme is provided: a metal hard sealing small flow regulating plunger valve comprises a cylindrical outer valve body, wherein a main inlet and a main outlet are respectively arranged at two ends of the outer valve body, a cylindrical inner valve body which is concentric with the outer valve body is arranged in the outer valve body, so that a conveying interlayer is formed between the outer valve body and the inner valve body, one end of the inner valve body, which faces the main outlet, is positioned in the main outlet and is sealed, an auxiliary inlet is arranged at one end of the inner valve body, which faces the main inlet, and is fixedly connected with the main inlet, a plurality of auxiliary outlets which are uniformly distributed and arranged along the circumferential direction of the inner valve body are arranged at one end of the inner valve body, which is close to the auxiliary inlet, the auxiliary outlets are communicated with the conveying interlayer, at least two guide rods which are uniformly distributed along the circumferential direction of the inner valve body are arranged in an inner cavity of the inner valve body, the axes of the guide rods are in the same direction with the inner valve body, a piston which, the valve rod is provided with a crank, and the crank is hinged with a connecting rod which is connected with the piston and used for controlling the piston to slide in the axial range of the inner valve body provided with the auxiliary outlet.

In the structure, the driving device is a driving motor or a hydraulic cylinder or an air cylinder, so that the valve rod is driven to rotate within a certain angle range, the valve rod drives the crank to rotate, meanwhile, the crank pushes the connecting rod to drive the piston to enable the piston to slide along the guide rod, the guide rod can effectively control the sliding direction of the piston, the piston is prevented from shaking, and the repeated positioning and the opening and closing flow accuracy are improved; fluid medium enters from the auxiliary inlet, the size of the auxiliary outlet is adjusted and controlled through the sliding of the piston to control the flow of the fluid medium, and the fluid medium enters the conveying interlayer from the auxiliary outlet and then flows out from the main outlet.

The invention is further arranged in such a way that the piston is cylindrical, bearing seats are arranged at positions, close to two ends, of the inner cylindrical wall of the piston, sliding sleeves in sliding fit with the guide rods are arranged on the bearing seats, and the sliding sleeves are made of antimony-impregnated graphite.

In the structure, when the piston and the guide rod are in a high-temperature working condition, the piston and the guide rod are easy to block, and the soaked antimony graphite (high-temperature-resistant soaked antimony alloy graphite) is arranged between the piston and the guide rod, can resist 650 ℃, has very good wear resistance and self-lubricating property at high temperature, ensures that the piston runs smoothly under the high-temperature working condition, and is favorable for improving the opening and closing sensitivity.

The invention is further provided that a piston reinforcing rib is supported on the inner wall of the piston, a cross head hinged with the connecting rod is arranged in the center of the piston reinforcing rib, and the valve rod is positioned on one side of the piston facing the main outlet.

In the structure, the connecting rod is hinged with the cross head, so that the smooth movement of the transmission chain is ensured.

The invention is further arranged in such a way that a valve seat sealing ring is arranged on the auxiliary inlet, an annular front sealing pair is arranged between the valve seat sealing ring and the inner wall of the inner valve body close to the auxiliary inlet, an outer chamfer is arranged at the junction of the end surface of the piston facing one end of the auxiliary inlet and the outer cylindrical wall, and the front sealing pair is in contact sealing with the outer chamfer.

In the structure, the outer chamfer can be abutted to the annular front sealing pair, and the outer chamfer has a guiding effect and can play a role in mutual play adaptation when being abutted to the front sealing pair.

The invention is further arranged in such a way that a detachable rear sealing pair is arranged on the end face of one end, facing the main outlet, of the piston, a thickened ring is arranged on the inner wall, provided with the auxiliary outlet, of the inner valve body, a rear chamfer is arranged at the junction of the outer cylindrical wall of the rear sealing pair and one end, facing the main inlet, of the rear sealing pair, and when the piston is in contact sealing with the front sealing pair, the rear sealing pair is in contact sealing with the rear chamfer.

In the above-mentioned structure, can play synchronous sealed effect, when the sealed pair of back and thickening ring contact are sealed simultaneously, can effectively stabilize the axis of piston, avoid the piston slope jamming to appear.

The invention is further arranged in such a way that one end of the inner valve body facing the main outlet is closed by arranging a tail cone cover, one end of the guide rod is fixed on the tail cone cover, and the other end of the guide rod is fixed on the valve seat sealing ring.

In the structure, the tail cone cover has a rectification effect, and the turbulence of the inner valve body towards one end of the main outlet is reduced.

The invention is further arranged in that a plurality of springs which are uniformly distributed and supported along the circumferential direction of the front sealing pair are arranged between the end surface of the front sealing pair, which is back to the main outlet, and the valve seat sealing ring, and the front sealing pair can push the compression springs under the extrusion of the piston to enable the front sealing pair and the rear sealing pair to realize sealing simultaneously.

In the structure, the spring can enable the piston to retreat when in contact sealing with the front sealing pair until the rear sealing pair is in contact sealing with the thickening ring, so that the reliability of the sealing of the front sealing pair and the thickening ring is effectively ensured.

The invention is further arranged in that a metal O-shaped ring is arranged between the front sealing pair and the inner cylindrical wall of the end of the inner valve body, which is provided with the auxiliary inlet.

In the structure, the inert gas is filled in the metal O-shaped ring, the sealing effect is good, and the sealing can meet the standard requirement when the front sealing pair is contacted with the piston to generate axial sliding.

The invention is further arranged that the outer wall of the inner valve body and the inner wall of the outer valve body are supported and fixed through the supporting ribs.

In the structure, the direction of the support rib is the same as the axial line of the outer valve body or the inner valve body, and the flowing resistance of the medium can be reduced.

The invention is further provided that the flow of the cross section of the conveying interlayer is not less than the sum of the flow of the cross sections of the auxiliary outlets.

In the structure, the loss of the flow caused by the conveying interlayer can be reduced.

The invention has the beneficial effects that: the driving device is a driving motor or a hydraulic cylinder or an air cylinder, so that the valve rod is driven to rotate within a certain angle range, the valve rod drives the crank to rotate, meanwhile, the crank pushes the connecting rod to drive the piston to slide along the guide rod, the guide rod can effectively control the sliding direction of the piston, the piston is prevented from shaking, and the repeated positioning and the flow opening and closing precision are improved; fluid medium enters from the auxiliary inlet, the size of the auxiliary outlet is adjusted and controlled through the sliding of the piston to control the flow of the fluid medium, and the fluid medium enters the conveying interlayer from the auxiliary outlet and then flows out from the main outlet.

Drawings

Fig. 1 is a schematic front view of a full-section structure of the present invention.

Fig. 2 is a left side view structural diagram of the present invention.

Fig. 3 is a cross-sectional view taken along line E-E of fig. 2 in accordance with the present invention.

FIG. 4 is an enlarged view of the portion A of FIG. 1 according to the present invention.

FIG. 5 is an enlarged view of the portion B of FIG. 1 according to the present invention.

FIG. 6 is an enlarged view of the portion C of FIG. 3 according to the present invention.

The reference numbers in the figures mean: 10-an outer valve body; 11-a primary inlet; 12-a main outlet; 13-a transport sandwich; 14-a drive device; 15-a valve stem; 16-a crank; 17-a connecting rod; 18-support ribs; 20-an inner valve body; 21-an auxiliary inlet; 22-secondary outlet; 23-a guide bar; 24-a valve seat sealing ring; 25-front sealing pair; 251-metal O-ring; 26-thickened ring; 27-caudal vertebra cap; 28-a spring; 30-a piston; 31-a bearing seat; 32-a sliding sleeve; 33-piston reinforcing ribs; 34-a cross head; 35-outer chamfer angle; 36-rear sealing pair; 361-rear chamfer.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Referring to fig. 1 to 6, a metal hard sealing small flow rate regulating plunger valve as shown in fig. 1 to 6 includes a cylindrical outer valve body 10, a main inlet 11 and a main outlet 12 are respectively provided at two ends of the outer valve body 10, a cylindrical inner valve body 20 disposed concentrically with the outer valve body 10 is provided in the outer valve body 10 so that a conveying interlayer 13 is formed between the outer valve body 10 and the inner valve body 20, one end of the inner valve body 20 facing the main outlet 12 is disposed in the main outlet 12 and sealed, one end of the inner valve body 20 facing the main inlet 11 is provided with an auxiliary inlet 21 and fixedly connected with the main inlet 11, one end of the inner valve body 20 close to the auxiliary inlet 21 is provided with a plurality of auxiliary outlets 22 uniformly distributed and opened along the circumferential direction thereof, the auxiliary outlets 22 are communicated with the conveying interlayer 13, an inner cavity of the inner valve body 20 is provided with at least two guide rods 23 uniformly distributed along the circumferential direction thereof and having the same axis as the inner valve body 20, the inner valve body 20 is further internally provided with a piston 30 in sliding fit with the guide rod 23, the outer valve body 10 is provided with a driving device 14, the driving device 14 is provided with a valve rod 15 connected to the inner valve body 20, the valve rod 15 is provided with a crank 16, and the crank 16 is hinged with a connecting rod 17 which is connected with the piston 30 and is used for controlling the piston 30 to slide in a reciprocating manner in the axial range of the inner valve body 20 provided with the auxiliary outlet 21.

In the above structure, the driving device 14 is a driving motor or a hydraulic cylinder or an air cylinder, so as to drive the valve rod 15 to rotate within a certain angle range, so that the valve rod 15 drives the crank 16 to rotate, and simultaneously the crank 16 pushes the connecting rod 17 to drive the piston 30 to enable the piston 30 to slide along the guide rod 23, and the guide rod 23 can effectively control the sliding direction of the piston 30, avoid the piston 30 from shaking, and is beneficial to improving the precision of repeated positioning and opening and closing flow; the fluid medium enters from the secondary inlet 21, the size of the secondary outlet 22 is controlled through the sliding adjustment of the piston 30 to control the flow rate of the fluid medium, and the fluid medium enters the conveying interlayer 13 from the secondary outlet 22 and then flows out from the main outlet 12.

In this embodiment, the piston 30 is cylindrical, the inner cylindrical wall of the piston is provided with bearing seats 31 near two ends, the bearing seats 31 are provided with sliding sleeves 32 in sliding fit with the guide rods 23, and the sliding sleeves 32 are graphite impregnated with antimony.

In the structure, when the piston 30 and the guide rod 23 are in a high-temperature working condition, the piston 30 and the guide rod 23 are easy to block, and the sliding sleeve 32 made of antimony-impregnated graphite (high-temperature-resistant antimony-impregnated alloy graphite) is arranged between the piston 30 and the guide rod 23, so that the sliding sleeve can resist 650 ℃, has very good wear resistance and self-lubricating property at high temperature, ensures that the piston 30 runs smoothly under the high-temperature working condition, and is favorable for improving the opening and closing sensitivity.

In this embodiment, a piston rib 33 is supported on the inner wall of the piston 30, a cross head 34 hinged to the connecting rod 17 is arranged at the center of the piston rib 33, and the valve rod 15 is located on the side of the piston 30 facing the main outlet 12.

In the structure, the connecting rod 17 is hinged with the cross head 34, so that the smooth movement of the transmission chain is ensured.

In this embodiment, a valve seat sealing ring 24 is arranged on the auxiliary inlet 21, an annular front sealing pair 25 is arranged between the valve seat sealing ring 24 and the inner wall of the inner valve body 20 close to the auxiliary inlet 21, an outer chamfer 35 is arranged at the junction of the end face of the piston 30 facing one end of the auxiliary inlet 21 and the outer cylindrical wall, and the front sealing pair 25 is in contact sealing with the outer chamfer 35.

In the structure, the outer chamfer 35 can be contacted with the annular front sealing pair 25 in an abutting mode, and meanwhile the outer chamfer 35 has a guiding effect and can play a role in mutual play and adaptation when abutting against the front sealing pair 25.

In this embodiment, a detachable rear sealing pair 36 is disposed on an end surface of the piston 30 facing the main outlet 12, a thickened ring 26 is disposed on an inner wall of the inner valve body 20 having the auxiliary outlet 22, a rear chamfer 361 is disposed at a junction between an outer cylindrical wall of the rear sealing pair 36 and an end surface thereof facing one end of the main inlet 11, and when the piston 30 is in contact sealing with the front sealing pair 25, the rear sealing pair 36 is in contact sealing with the rear chamfer 361.

In the above-mentioned structure, can play synchronous sealed effect, back sealing pair 36 and thickening ring 26 contact when sealed simultaneously, can effectively stabilize the axis of piston 30, avoid piston 30 to appear the slope jamming.

In this embodiment, the end of the inner valve body 20 facing the main outlet 12 is closed by a tail cone cover 27, and one end of the guide rod 23 is fixed on the tail cone cover 27, and the other end is fixed on the valve seat sealing ring 24.

In the above structure, the tail cone cover 27 has a flow rectification effect to reduce the turbulent flow of the inner valve body 20 toward one end of the main outlet 12.

In this embodiment, a plurality of springs 28 are arranged and supported along the circumferential direction of the front sealing pair 25 between the end surface of the front sealing pair 25 facing away from the main outlet 12 and the valve seat sealing ring 24, and the front sealing pair 25 can push the compression springs 28 under the extrusion of the piston 30 to enable the front sealing pair 25 and the rear sealing pair 36 to realize sealing simultaneously.

In the structure, the spring 28 can enable the piston 30 to retreat when in contact sealing with the front sealing pair 25 until the rear sealing pair 36 is in contact sealing with the thickened ring 26, thereby effectively ensuring the reliability of the sealing of the two.

In this embodiment, a metal O-ring 251 is disposed between the front sealing pair 25 and the inner cylindrical wall of the inner valve body 20 at the end where the auxiliary inlet 21 is disposed.

In the structure, inert gas is filled in the metal O-shaped ring 251, the sealing effect is good, and the sealing can meet the standard requirement when the front sealing pair 25 is contacted with the piston 30 to generate axial sliding.

In this embodiment, the outer wall of the inner valve body 20 and the inner wall of the outer valve body 10 are supported and fixed by the support rib 18.

In the above structure, the support rib 18 is oriented in the same direction as the axis of the outer valve body 10 or the inner valve body 20, and the flow resistance of the medium can be reduced.

In this embodiment, the cross-sectional flow rate of the conveying interlayer 13 is not less than the sum of the cross-sectional flow rates of the secondary outlets 22.

In the above configuration, the loss of the flow rate by the conveyance sandwich 13 can be reduced.

The invention has the beneficial effects that: the driving device 14 is a driving motor or a hydraulic cylinder or an air cylinder, so as to drive the valve rod 15 to rotate within a certain angle range, the valve rod 15 drives the crank 16 to rotate, meanwhile, the crank 16 pushes the connecting rod 17 to drive the piston 30 to slide along the guide rod 23, the guide rod 23 can effectively control the sliding direction of the piston 30, the piston 30 is prevented from shaking, and the repeated positioning and the flow opening and closing precision are improved; the fluid medium enters from the secondary inlet 21, the size of the secondary outlet 22 is controlled through the sliding adjustment of the piston 30 to control the flow rate of the fluid medium, and the fluid medium enters the conveying interlayer 13 from the secondary outlet 22 and then flows out from the main outlet 12.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and those modifications and variations assumed in the above are also considered to be within the protective scope of the present invention.