CN111946833A

CN111946833A - Flow-adjustable needle valve

Info

Publication number: CN111946833A
Application number: CN202010845163.5A
Authority: CN
Inventors: 张磊; 孙围华; 张魁榜; 张智明
Original assignee: Chuanbei Vacuum Technology Beijing Co ltd
Current assignee: Chuanbei Vacuum Technology Beijing Co ltd
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2020-11-17

Abstract

The invention provides a flow-adjustable needle valve, which belongs to the technical field of needle valves and comprises: a valve body; a needle-like seal shaft; the driving rod is connected in the valve body in an axially movable mode through threads, and one end of the driving rod is abutted to the top end of the needle-shaped sealing shaft; according to the flow-adjustable needle valve, the driving rod axially moves in the valve body to drive the needle-shaped sealing shaft to move, and the movement distance of the driving rod is adjustable and controllable due to the fact that the driving rod moves through threads, so that the movement distance of the needle-shaped sealing shaft is controllable, the front end of the needle-shaped sealing shaft gradually moves towards the small hole, the size of an opening of the small hole is gradually changed, and the flow in the small hole is adjusted; the needle-shaped sealing shaft comprises a sealing shaft body and an adjusting needle, the sealing shaft body is in threaded connection with the adjusting needle, the adjusting needle can be worn for a long time, and the needle is conveniently replaced and saves cost through being in threaded connection with the sealing shaft body.

Description

Flow-adjustable needle valve

Technical Field

The invention relates to the technical field of needle valves, in particular to a needle valve capable of adjusting flow.

Background

Needle valves are commonly used in vacuum systems, and the common needle valves mainly have two states in operation: open and close. When the vacuum valve is opened, the vacuum pipeline is communicated; when the vacuum valve is closed, the vacuum pipeline is disconnected. In some vacuum systems, not only an on-off function but also a function of enabling flow regulation is required.

The valve plug of the needle valve is needle-shaped, and the sealing between the needle-shaped sealing shaft and the valve seat is achieved by the close fit of the conical surface of the needle-shaped sealing shaft and the valve seat.

In the prior art, the flow rate of the needle valve is adjusted as follows: the needle-shaped sealing shaft is connected with the driving rod through threads; the driving rod rotates to realize the reciprocating movement of the needle-shaped sealing shaft in the valve body, thereby realizing the regulation of flow.

However, during the rotation of the driving rod, the needle-shaped sealing shaft has a large rotation torsion, and in a vacuum system, the torsion has a large influence on the sealing effect of the needle valve.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that when the needle valve in the prior art is used for adjusting the flow, the needle sealing shaft has torsion and has a great influence on the sealing effect, so that the needle valve capable of adjusting the flow is provided.

The invention provides a needle valve capable of adjusting flow, which comprises:

the valve body is internally provided with a channel for circulating a medium, and the channel is internally provided with a small hole suitable for regulating the flow;

a needle seal shaft slidably disposed within the passage of the valve body and having a tip directed toward the orifice;

the driving rod is connected in the valve body in an axially movable mode through threads, one end of the driving rod is abutted to the top end of the needle-shaped sealing shaft, and the other end of the driving rod is suitable for being connected with a hand wheel;

the needle-shaped sealing shaft is provided with a plurality of needle-shaped sealing shafts, and the needle-shaped sealing shafts are sleeved with the driving rods.

Preferably, the end of the driving rod is provided with a receiving groove which is suitable for being sleeved on the top end of the needle-shaped sealing shaft.

Preferably, the needle-shaped sealing shaft is provided with a first annular groove suitable for embedding the rolling piece on the outer wall of the part extending into the accommodating groove of the driving rod;

a second annular groove which is opposite to the first annular groove and is suitable for embedding a rolling element is formed in the inner wall of the accommodating groove;

a plurality of rolling pieces are embedded in the first annular groove and the second annular groove.

Preferably, the rolling members are spherical.

Preferably, a rotatable ball is disposed in the receiving groove at a top end of the needle seal shaft.

As a preferred scheme, the valve body comprises an upper valve body and a lower valve body, the upper valve body is detachably connected with the lower valve body, and a sealing assembly is arranged between the upper valve body and the lower valve body.

Preferably, the sealing assembly includes:

the sealing pressure plate is clamped between the upper valve body and the lower valve body;

the first annular sealing element is arranged between the sealing pressure plate and the lower valve body in a sealing and pressing mode;

and one end of the corrugated pipe is hermetically connected to one section of the needle-shaped sealing shaft close to the tip, and the other end of the corrugated pipe is hermetically connected to the sealing pressure plate.

Preferably, a section of the needle-shaped sealing shaft near the tip is provided with an annular flange, and the annular flange is connected with one end of the corrugated pipe in a sealing mode.

Preferably, a third annular groove is formed in the lower surface of the annular flange, the third annular groove is a dovetail-shaped groove, a second annular sealing element is arranged in the third annular groove, and the second annular sealing element is suitable for being in sealing contact with the inner wall of the passage of the valve body.

Preferably, the lower valve body has a fourth annular groove facing the sealing pressure plate, and the first annular sealing member is accommodated in the fourth annular groove.

The technical scheme of the invention has the following advantages:

1. the invention provides a needle valve capable of adjusting flow, which comprises: the valve body, the needle-shaped sealing shaft and the driving rod; the driving rod axially moves in the valve body to drive the needle-shaped sealing shaft to move, and the movement distance of the driving rod is adjustable and controllable due to the fact that the driving rod moves through threads, so that the movement distance of the needle-shaped sealing shaft is controllable, the front end of the needle-shaped sealing shaft gradually moves towards the small hole, the size of an opening of the small hole is gradually changed, and the flow in the small hole is adjusted; a plurality of rolling pieces are arranged between the sleeving parts; through the setting of rolling member for can promote the removal of needle-like sealed axle when the drive shaft rotates, nevertheless can not make needle-like sealed axle produce torsion again, influence sealed effect, thereby the setting of this structure has guaranteed the sealed effect of needle valve.

2. According to the flow-adjustable needle valve provided by the invention, the end part of the driving rod is provided with the containing groove, the outer wall of the needle-shaped sealing shaft is provided with the first annular groove, the inner wall of the containing groove is provided with the second annular groove, and the first annular groove and the second annular groove are internally provided with the spherical rolling parts; the axial motion is converted into linear motion through the arrangement of the structure; the linear downward movement of the driving rod is driven by the downward movement of the driving rod, so that the sealing between the valve body and the needle-shaped sealing shaft is facilitated, and the sealing effect is improved.

3. According to the needle valve capable of adjusting the flow, the rotatable spherical part is arranged at the top end of the needle sealing shaft in the accommodating groove; the provision of the ball reduces friction at the connection between the needle seal shaft and the drive rod during relative rotation.

4. The invention provides a needle valve capable of adjusting flow, which comprises a sealing assembly and a valve body, wherein the sealing assembly comprises: the sealing pressure plate, the first annular sealing element and the corrugated pipe are arranged on the outer side of the sealing pressure plate; and the sealing between the upper valve body and the lower valve body is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a front sectional view showing a sealing state of an adjustable flow rate needle valve according to the present invention.

Fig. 2 is a partially enlarged view of a portion a shown in fig. 1.

Fig. 3 is a partially enlarged view of the point C shown in fig. 1.

Fig. 4 is a front sectional view showing a flow state of the flow rate adjustable needle valve of the present invention.

Fig. 5 is a partially enlarged view of B shown in fig. 4.

Description of reference numerals:

1. an upper valve body; 2. a lower valve body; 3. a needle-like seal shaft; 4. a drive rod; 5. a small hole; 6. an accommodating groove; 7. a first annular groove; 8. a second annular groove; 9. a rolling member; 10. a spherical member; 11. sealing the pressure plate; 12. a bellows; 13. a fourth annular groove; 14. a first annular seal; 15. an annular flange; 16. A hand wheel; 17. a third annular groove; 18. a second annular seal.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments of the present invention without any creative effort, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features related to the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The needle valve capable of adjusting the flow rate provided by the embodiment, as shown in fig. 1, includes: a valve body, a needle-shaped sealing shaft 3 and a driving rod 4; the actuating lever 4 carries out axial displacement in the valve body, drives needle-like sealed axle 3 and moves, because the removal of actuating lever 4 is through the screw thread, so the displacement is adjustable controllable, realizes that the needle-like sealed axle 3 displacement is controllable, and the front end of needle-like sealed axle 3 moves towards aperture 5 gradually for the open-ended size of aperture 5 changes gradually, realizes the regulation of flow in the aperture 5.

The valve body comprises an upper valve body 1 and a lower valve body 2 which are detachably connected, a channel which is communicated with each other and used for circulating a medium is arranged in each of the upper valve body 1 and the lower valve body 2, a small hole 5 suitable for flow regulation is formed in each channel, and the small hole 5 can be an inlet or an outlet.

Follow axial displacement in last valve body 1 and be provided with actuating lever 4, actuating lever 4 with go up the passageway threaded connection of valve body 1, the one end of actuating lever 4 and the top butt of needle-like sealed axle 3, the other end stretches out go up the passageway and the hand wheel 16 of valve body 1 and be connected.

As shown in fig. 2, the end of the driving rod 4 has a receiving groove 6, and the receiving groove 6 can be sleeved on the top end of the needle-shaped sealing shaft 3; a first annular groove 7 is formed in the outer wall of the part, extending into the accommodating groove 6 of the driving rod 4, of the needle-shaped sealing shaft 3, a second annular groove 8 is formed in the inner wall of the accommodating groove 6, the first annular groove 7 and the second annular groove 8 are oppositely arranged, and a plurality of rolling pieces 9 in spherical shapes are embedded in the first annular groove 7 and the second annular groove 8; the arrangement of the structure realizes that the rotation downward movement of the driving rod 4 drives the linear downward movement of the driving rod 4.

Further, the bottom of the receiving groove 6 and the top of the seal ring are provided with a ball 10, and the ball 10 is rotatably disposed with the driving rod 4 and the needle seal ring.

As shown in fig. 5, a sealing pressure plate 11 is pressed between the upper valve body 1 and the lower valve body 2, and one end of a corrugated pipe 12 is connected to the sealing pressure plate; a fourth annular groove 13 facing the sealing pressure plate is formed in the lower valve body 2, a first annular sealing member 14 is accommodated in the fourth annular groove 13, and the first annular sealing member 14 can enhance the sealing performance of the joint of the upper valve body 1 and the lower valve body 2;

as shown in fig. 3, an annular flange 15 is provided on one end of the needle-like seal shaft 3 near the tip, and the other end of the bellows 12 is connected to the annular flange 15; the lower surface of the first annular flange 15 is provided with a third annular groove 17, the third annular groove 17 is a dovetail-shaped groove, a second annular sealing element 18 is arranged in the third annular groove 17, and when the needle-shaped sealing shaft 3 seals the small hole 5, the second annular sealing element 18 is in sealing contact with the inner wall of the passage of the valve body, so that the sealing effect is enhanced.

The needle-shaped sealing shaft comprises a sealing shaft body and an adjusting needle, the sealing shaft body is connected with the adjusting needle through threads, and the adjusting needle moves along with the sealing shaft body, so that the size of an opening of a small hole is gradually changed, and the flow in the small hole is adjusted; the adjusting needle can be worn for a long time, and is convenient to replace and saves cost through being in threaded connection with the sealing shaft body.

Method of use and principles

As shown in fig. 1, the needle valve is in a sealing state that the needle-shaped sealing shaft 3 seals the small hole 5, i.e. the medium cannot pass through the needle valve; the hand wheel 16 is rotated to enable the driving rod 4 to rotate and move upwards in the upper valve body 1, and due to the arrangement of the rolling piece 9, the needle-shaped sealing shaft 3 cannot rotate along with the driving rod 4, but can move upwards along with the driving rod 4; the front end of the needle seal shaft 3 is disengaged from the small hole 5 as shown in fig. 4, so that the medium can flow through the small hole 5, and the needle valve is in a flow state.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A needle valve capable of adjusting flow, comprising:

a valve body, the interior of which is provided with a channel for circulating a medium, and the channel is internally provided with a small hole (5) suitable for adjusting the flow;

a needle-like sealing shaft (3) slidably arranged in the passage of the valve body and having a tip directed towards the small hole (5);

the driving rod (4) is connected in the valve body in an axially movable mode through threads, one end of the driving rod (4) is abutted to the top end of the needle-shaped sealing shaft (3), and the other end of the driving rod (4) is suitable for being connected with a hand wheel (16);

the needle-shaped sealing device is characterized in that a mutual sleeving part is arranged between the driving rod (4) and the needle-shaped sealing shaft (3), and a plurality of rolling pieces (9) are embedded between the mutual sleeving parts of the driving rod (4) and the needle-shaped sealing shaft (3).

2. Flow-adjustable needle valve according to claim 1, characterized in that the end of the driving rod (4) has a housing groove (6) suitable for fitting over the top end of the needle sealing shaft (3).

3. Flow-adjustable needle valve according to claim 2, characterized in that the portion of the needle-like sealing shaft (3) that protrudes into the housing groove (6) of the driving rod (4) has, on its outer wall, a first annular groove (7) adapted to engage in a rolling member (9);

the inner wall of the accommodating groove (6) is provided with a second annular groove (8) which is opposite to the first annular groove (7) and is suitable for embedding a rolling piece (9);

a plurality of rolling pieces (9) are embedded in the first annular groove (7) and the second annular groove (8).

4. A flow-adjustable needle valve according to claim 3, characterized in that the rolling member (9) is spherical.

5. Flow-adjustable needle valve according to any one of claims 2 to 4, characterized in that the accommodation groove (6) is provided with a rotatable ball (10) in the tip of the needle seal shaft (3).

6. The flow-adjustable needle valve according to any one of claims 1 to 5, characterized in that the valve body comprises an upper valve body (1) and a lower valve body (2), the upper valve body (1) and the lower valve body (2) are detachably connected, and a sealing assembly is arranged between the upper valve body (1) and the lower valve body (2).

7. The adjustable flow needle valve of claim 6, wherein the seal assembly comprises:

the sealing pressure plate (11) is clamped between the upper valve body (1) and the lower valve body (2);

the first annular sealing element (14) is arranged between the sealing pressure plate (11) and the lower valve body (2) in a sealing and pressing mode;

and one end of the corrugated pipe (12) is connected to one section of the needle-shaped sealing shaft (3) close to the tip in a sealing manner, and the other end of the corrugated pipe is connected to the sealing pressure plate (11) in a sealing manner.

8. The adjustable flow needle valve according to claim 7, wherein the needle seal shaft (3) has an annular flange (15) on a section near the tip, the annular flange (15) being sealingly connected to one end of the bellows (12).

9. The adjustable flow needle valve according to claim 8, wherein the annular flange (15) has a third annular groove (17) on a lower surface thereof, the third annular groove (17) being a dovetail groove, a second annular seal (18) being provided in the third annular groove (17), the second annular seal (18) being adapted to be in sealing contact with the inner channel wall of the valve body.

10. Flow-adjustable needle valve according to any one of claims 7 to 9, characterized in that the lower valve body (2) has a fourth annular groove (13) facing the sealing pressure plate (11), the first annular seal (14) being housed in the fourth annular groove (13).