CN212147456U

CN212147456U - Miniature liquid needle injection valve

Info

Publication number: CN212147456U
Application number: CN202020528686.2U
Authority: CN
Inventors: 郑国平; 陈旭
Original assignee: Nanjing Jieya Extrusion Equipment Co ltd
Current assignee: Nanjing Jieya Extrusion Equipment Co ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2020-12-15
Anticipated expiration: 2030-04-10

Abstract

The utility model discloses a micro liquid injection needle valve, which comprises a valve body, a needle and an adjusting mechanism, wherein one end of the valve body is an outlet end, the other end is an adjusting end, a containing cavity and a liquid injection cavity communicated with the containing cavity are arranged in the valve body along the length direction, the liquid injection cavity runs through the outlet end, the adjusting mechanism is arranged in the containing cavity, the outlet end of the valve body is provided with a first liquid outlet hole and a threaded connecting hole corresponding to the length direction of the valve body, a nozzle is connected at the outlet end of the valve body through threads and can be disassembled and replaced, when the flow is very small and the liquid cannot form trickle through the nozzle hole, the nozzle with smaller aperture can be replaced, compared with the traditional liquid injection needle valve in which the discharge hole is processed on the valve body, the small hole is difficult to be processed, and the valve body needs to be replaced when the aperture is changed, the nozzle of, can be according to different service behavior, change different and bump the mouth, its commonality is strong not only.

Description

Miniature liquid needle injection valve

Technical Field

The utility model relates to a double screw extruder field, concretely relates to needle valve is annotated to miniature liquid.

Background

With the rapid development of the rubber and plastic industries, twin-screw extruders are increasingly being used. The twin-screw extruder is particularly advantageous in that it is excellent in mixing properties, and in actual production, various liquid auxiliaries are sometimes added to the extruder for blending operation. And (3) adding the liquid material into the double-screw extruder, namely requiring a liquid injection needle valve, atomizing the liquid material through the liquid injection needle valve, and then adding the atomized liquid material into the double-screw extruder.

The working principle of a common liquid injection needle valve is as follows: the liquid metering pump delivers high-pressure fluid into the inner cavity of the liquid injection needle valve, the valve needle moves upwards against the spring force and the resistance of the sealing piece under the action of hydraulic force, a gap is formed between the valve needle and the sealing surface of the valve seat, and the liquid is atomized through a proper gap.

The traditional liquid injection nozzle discharge hole is processed on a valve body, small holes are difficult to process, the valve body needs to be replaced when the hole diameter is changed, the processing period of the valve body is long when the valve body is processed again, the material waste is large, an outlet at the bottom of the valve body is usually large for adapting to large-flow liquid, but the phenomenon of 'cutoff' occurs when the liquid flow is small, namely the liquid is discharged for a while, and the liquid is not discharged for a while, and the reason is that the diameter of a liquid injection needle valve discharge hole is too large, and the internal structure is not suitable for small flow; in addition, it is difficult to clean the metal sheet when clogging occurs.

The utility model discloses small flow liquid injection needle valve is designed for solving small flow liquid filling problem.

Disclosure of Invention

In order to solve the problem, the utility model discloses a miniature liquid needle injection valve.

In order to achieve the above purpose, the utility model provides a following technical scheme: a micro liquid injection needle valve comprises a valve body, a needle and an adjusting mechanism, wherein one end of the valve body is an outlet end, the other end of the valve body is an adjusting end, the valve body is internally provided with an accommodating cavity and a liquid injection cavity communicated with the accommodating cavity along the length direction, the liquid injection cavity penetrates through the outlet end, the adjusting mechanism is arranged in the accommodating cavity, the outlet end of the valve body is provided with a first liquid outlet hole and a threaded connecting hole corresponding to the length direction of the valve body, the diameter of the first liquid outlet is smaller than that of the threaded connecting hole, two ends of the first liquid outlet are respectively communicated with the liquid injection cavity and the threaded connecting hole, the valve needle is arranged in the liquid injection cavity, one end of the valve needle is connected with the adjusting mechanism, the other end of the first liquid outlet hole extends to the joint of the first liquid outlet hole and the liquid injection cavity and plugs the first liquid outlet hole, and the threaded connecting hole extends downwards and penetrates through the outlet end;

the liquid injection needle valve also comprises a nozzle, a connecting part is convexly arranged on the nozzle upwards, the connecting part extends into the threaded connecting hole and is connected and matched with the threaded connecting hole through threads, a second liquid outlet hole is formed in the nozzle along the length direction of the nozzle, and the second liquid outlet hole penetrates through the nozzle;

the sealing device is characterized in that a sealing gasket is further arranged between the connecting part and the threaded connecting hole, a conical sealing surface is convexly arranged at the top of the sealing gasket, the top of the threaded connecting hole corresponds to the conical sealing surface, a conical concave surface which is in sealing fit with the conical sealing surface is concavely arranged on the conical sealing surface in a sealing and abutting mode, a third liquid outlet hole is formed in the sealing gasket, two ends of the third liquid outlet hole are respectively communicated with the first liquid outlet hole and the second liquid outlet hole, and the first liquid outlet hole, the second liquid outlet hole and the third liquid outlet hole are coaxially arranged.

As an improvement of the utility model, the top of nozzle is equipped with the round bulge loop to the epirelief, the sealed bottom of filling up inwards concavely be equipped with the round with the complex recess is connected to the bulge loop, the recess buckle in on the bulge loop.

As an improvement of the utility model, the sealing gasket is a polytetrafluoroethylene sealing gasket.

As an improvement of the utility model, adjustment mechanism includes that case, cover locate the O shape sealing washer on the case and revolve the cap, the case sets up and is holding the intracavity to through O shape sealing washer and hold the chamber and seal up the cooperation mutually, the top of case with revolve the cap and rotate mutually and be connected, and revolve and be provided with the spring between the bottom of cap and the top of case, the bottom of case is connected with the needle, revolve the cap and stretch out to the outside of valve body.

Compared with the prior art, the utility model has the advantages of as follows:

1. the utility model discloses a nozzle installation, dismantlement and processing are all comparatively convenient, can be according to different service behavior, change different and bump the mouth, and it is strong not only, and it is fast to change the nozzle;

2. when blockage occurs, the nozzle is screwed down to clean the inside of the needle valve, and blockage is cleaned more conveniently and quickly;

3. the connecting portion and the sealed pad of nozzle all set up inside the valve body, and sealed the top of filling up and compare with traditional plane for this toper of toper sealed face, and its area of contact is bigger sealing performance better.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a portion of the outlet end of the valve body of FIG. 1;

FIG. 3 is an enlarged view of a portion A of FIG. 1;

fig. 4 is a schematic view of a connection structure of the nozzle and the gasket.

List of reference numerals: 1. a valve body; 11. an accommodating chamber; 12. a liquid injection cavity; 13. a first liquid outlet hole; 14. connecting a threaded hole; 141. a conical concave surface; 2. a valve needle; 3. an adjustment mechanism; 4. a nozzle; 41. a connecting portion; 42. a second liquid outlet hole; 43. a convex ring; 5. a gasket; 51. a tapered sealing surface; 52. a third liquid outlet hole; 53. and (4) a groove.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Example (b): referring to fig. 1-4, a micro liquid injection needle valve comprises a valve body 1, a needle 2 and an adjusting mechanism 3, wherein one end of the valve body 1 is an outlet end, the other end of the valve body is an adjusting end, a containing cavity 11 and an injection cavity 12 communicated with the containing cavity 11 are formed in the valve body 1 along the length direction of the valve body, the injection cavity 12 penetrates through the outlet end, and the adjusting mechanism 3 is arranged in the containing cavity 11; the tightness of the spring can be adjusted by rotating the screw cap, so that the resistance of the valve needle 2 to the spring is changed; the valve body 1 is also provided with a liquid inlet hole which is communicated with the liquid injection cavity 12 and is used for being communicated with an external pipeline to inject liquid into the liquid injection cavity 12;

the outlet end of the valve body 1 is provided with a first liquid outlet hole 13 and a threaded connecting hole 14 corresponding to the length direction of the valve body 1, the diameter of the first liquid outlet hole 13 is smaller than that of the threaded connecting hole 14, two ends of the first liquid outlet hole 13 are respectively communicated with the liquid injection cavity 12 and the threaded connecting hole 14, the valve needle 2 is arranged in the liquid injection cavity 12, one end of the valve needle 2 is connected with the adjusting mechanism 3, the other end of the valve needle extends to the connection position of the first liquid outlet hole 13 and the liquid injection cavity 12 and blocks the first liquid outlet hole 13, concretely, the bottom of the valve needle 2 is provided with a tip end, the tip end is partially inserted into the first liquid outlet hole 13 under the elastic action of the spring, the side surface of the tip end is in sealing butt joint with the first liquid outlet hole 13 to prevent liquid from;

the liquid injection needle valve further comprises a nozzle 4, a connecting part 41 is convexly arranged on the nozzle 4 upwards, the connecting part 41 extends into the threaded connecting hole 14 and is connected and matched with the threaded connecting hole 14 through threads, a second liquid outlet hole 42 is formed in the nozzle 4 along the length direction of the nozzle, and the second liquid outlet hole 42 penetrates through the nozzle 4;

still be provided with sealed the pad 5 between connecting portion 41 and the threaded connection hole 14, the protruding sealed face 51 that is equipped with of top of this sealed pad 5, the top of threaded connection hole 14 corresponds the sealed face 51 of toper and concavely is equipped with the toper concave surface 141 with the sealed face 51 of toper mutually sealed complex, through screwing up nozzle 4, connecting portion 41 of nozzle 4 compresses tightly sealed pad 5 and supports on the toper concave surface 141 of threaded connection hole 14, so that the sealed face 51 of toper is sealed to be supported on toper concave surface 141, connecting portion 41 and sealed pad 5 of nozzle 4 all set up inside valve body 1, and sealed pad 5 top is the sealed face 51 of toper and this toper sealed face 51 compares with traditional plane, its area of contact is bigger, sealing performance is better.

A third liquid outlet 52 is formed in the sealing pad 5, two ends of the third liquid outlet 52 are respectively communicated with the first liquid outlet 13 and the second liquid outlet 42, the first liquid outlet 13, the second liquid outlet 42 and the third liquid outlet 52 are coaxially arranged, and the first liquid outlet 13, the second liquid outlet 42 and the third liquid outlet 52 form a liquid flow channel together;

when the valve works, the screw cap is unscrewed firstly, so that the spring is in a not-too-tight state, liquid with pressure conveyed from the metering pump enters the liquid injection cavity 12 of the valve body 1 from the liquid inlet of the valve body 1, the valve core moves upwards under the action of liquid pressure, the needle valve 2 is opened, the liquid flows out from the second liquid outlet hole 42 of the nozzle 4, the diameter of the second liquid outlet hole 42 on the nozzle 4 is usually set to be about 0.5mm, the liquid can form stable trickle, the screw cap is adjusted, the spring is properly pressed, the valve core is pushed downwards by the spring, the valve port gap is reduced, and the trickle flowing out from the nozzle can be changed into fine mist to be sprayed outwards after the gap reaches a proper size;

in the design, the nozzle 4 is connected on the valve body by threads and can be detached and replaced, when the flow is very small, the nozzle 4 with smaller aperture can be replaced when liquid cannot form thin flow through a second liquid outlet hole 42 (the diameter is 0.5 mm) of the nozzle, and compared with the traditional liquid injection needle valve, the discharge hole of the liquid injection needle valve is processed on the valve body, the small hole is difficult to process, and the needle valve needs to be replaced when the aperture is changed, the utility model discloses the installation, the detachment and the processing of the nozzle 4 are all convenient, different touch nozzles can be replaced according to different use working conditions, the universality is strong, and the nozzle replacing speed is fast; when the blockage is generated, the nozzle 4 is screwed down to clean the inside of the needle valve, and the blockage is cleaned more conveniently and quickly.

The top of nozzle 4 is equipped with round bulge loop 43 to the epirelief, and sealed bottom of filling up 5 is inwards sunken to be equipped with round and is connected complex recess 53 with bulge loop 43, and recess 53 buckle is on bulge loop 43, and sealed 5 of filling up has certain elasticity, and it is more convenient with nozzle 4 connection, can take out sealed 5 of filling up in step when rotating spiral-out nozzle 4 to in whole the change is carried out to it.

The sealing gasket 5 is a polytetrafluoroethylene sealing gasket which has better corrosion resistance and is suitable for the working condition of corrosive liquid.

The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims

1. The utility model provides a needle valve is annotated to miniature liquid, includes valve body (1), needle (2) and adjustment mechanism (3), the one end of valve body (1) is the exit end, and the other end is for adjusting the end, set up one along its length direction in valve body (1) and hold chamber (11) and with hold notes liquid chamber (12) that chamber (11) are linked together, it runs through to annotate liquid chamber (12) the exit end, adjustment mechanism (3) set up in holding chamber (11), its characterized in that: the outlet end of the valve body (1) is provided with a first liquid outlet hole (13) and a threaded connecting hole (14) corresponding to the length direction of the valve body (1), the diameter of the first liquid outlet hole (13) is smaller than that of the threaded connecting hole (14), two ends of the first liquid outlet hole (13) are respectively communicated with a liquid injection cavity (12) and the threaded connecting hole (14), the valve needle (2) is arranged in the liquid injection cavity (12), one end of the valve needle (2) is connected with the adjusting mechanism (3), the other end of the valve needle extends to the joint of the first liquid outlet hole (13) and the liquid injection cavity (12) and plugs the first liquid outlet hole (13), and the threaded connecting hole (14) extends downwards and penetrates through the outlet end;

the liquid injection needle valve further comprises a nozzle (4), a connecting part (41) is arranged on the nozzle (4) in an upward protruding mode, the connecting part (41) extends into the threaded connecting hole (14) and is connected and matched with the threaded connecting hole (14) through threads, a second liquid outlet hole (42) is formed in the nozzle (4) along the length direction of the nozzle, and the second liquid outlet hole (42) penetrates through the nozzle (4);

still be provided with sealed pad (5) between connecting portion (41) and threaded connection hole (14), the protruding sealed face (51) of toper that is equipped with in top of this sealed pad (5), the top of threaded connection hole (14) correspond toper sealed face (51) the concave toper concave surface (141) that is equipped with toper sealed face (51) looks seal fit, toper sealed face (51) sealed butt on toper concave surface (141), sealed pad (5) is last to have seted up third liquid hole (52), and the both ends of this third liquid hole (52) are linked together with first liquid hole (13) and second liquid hole (42) respectively, first liquid hole (13), second liquid hole (42) and third liquid hole (52) are coaxial to be set up.

2. The micro liquid needle injection valve according to claim 1, wherein: the top end of the nozzle (4) is provided with a circle of convex ring (43) in an upward protruding mode, the bottom end of the sealing gasket (5) is provided with a circle of concave groove (53) which is connected and matched with the convex ring (43) in an inward concave mode, and the concave groove (53) is buckled on the convex ring (43).

3. The micro liquid needle injection valve according to claim 1 or 2, wherein: the sealing gasket (5) is a polytetrafluoroethylene sealing gasket.

4. The micro liquid needle injection valve according to claim 1, wherein: the adjusting mechanism (3) comprises a valve core, an O-shaped sealing ring and a rotating cap, wherein the O-shaped sealing ring and the rotating cap are sleeved on the valve core, the valve core is arranged in the containing cavity (11) and is in sealing fit with the containing cavity (11) through the O-shaped sealing ring, the top of the valve core is rotatably connected with the rotating cap, a spring is arranged between the bottom of the rotating cap and the top of the valve core, the bottom of the valve core is connected with the valve needle (2), and the rotating cap extends out of the valve body (1).