JP2004009314A - Fluid injection nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a fluid from flowing into an extruder cylinder from a fluid injection nozzle when the inside of the extruder cylinder is in vacuum. <P>SOLUTION: The fluid injection nozzle 1 has the main body 1a in which the perforation 10 is formed, the tie 2 in which the perforation 11 is formed, the inflow prevention part 3 to prevent the fluid from flowing into the inside of the extruder cylinder 20, and the back flow prevention part 4 to prevent the resin from back-flow. The inflow prevention part 3 has the ball 6, the ball bed 7 supporting the ball 6, the spring 8 which urges the ball bed 7, and the liner 9 supported by the retaining part 10b. There is formed on the ball bed 7 the groove 7b, i.e. passage along which the fluid passes. The spring 8 is a coil spring with the urging force so set that it may not contract only with the vacuum inside the extruder cylinder 20. The back-flow prevention part 4 has the ball 12 and the ball bed 5 which accepts the ball 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluid injection nozzle for injecting a fluid supplied from the outside into an extruder cylinder for resin molding.
[0002]
[Prior art]
A side of an example of a fluid injection nozzle for injecting a liquid or gas such as water, oils, flame retardant, etc. in the extruder cylinder of a conventional extruder in order to improve the physical properties of the resin material being kneaded and melted. A cross-sectional view is shown in FIG.
[0003]
The fluid injection nozzle includes a cylindrical main body 100 having a through-hole 105 formed therein, an oil blower 102 for fixing the main body 100 to the extruder cylinder 104, a pressure from a liquid from the through-hole 105 side, or an extruder cylinder 104. It has a ball 101 that can be moved up and down by a resin pressure from inside and a backflow prevention unit 107 including a ball receiver 106 that receives the ball 101.
[0004]
The operation of supplying liquid to the extruder cylinder in the conventional fluid injection nozzle will be described.
[0005]
When the liquid is supplied to the fluid injection nozzle from the outside, the liquid first passes through the through-hole 105 and flows out from the gap between the ball 101 located on the ball receiver 106 and the outlet of the through-hole 105. A groove through which the liquid flows even when the ball 101 is pressed is formed in the ball receiver 106, and the liquid flows into the extruder cylinder 104 through the groove.
[0006]
On the other hand, when receiving the resin pressure from the inside of the extruder cylinder 104, the ball 101 located on the ball receiver 106 is lifted by this resin pressure until it comes into contact with the outlet of the through hole 105. The exit of the through-hole 105 is closed by the lifted ball 101, thereby preventing the resin in the extruder cylinder 104 from flowing back into the through-hole 105.
[0007]
[Problems to be solved by the invention]
However, in the above-described conventional fluid injection nozzle, when there is no resin pressure from the inside of the extruder cylinder and the inside of the extruder cylinder is in a vacuum state, the ball is lowered without blocking the through hole due to the negative pressure, and the liquid is May flow out of the gap between the ball and the outlet of the through hole and enter the extruder cylinder.
[0008]
Accordingly, a first object of the present invention is to provide a fluid injection nozzle in which liquid does not enter the extruder cylinder from the fluid injection nozzle even when the inside of the extruder cylinder is in a vacuum state.
[0009]
A second object of the present invention is to provide a fluid injection nozzle in which the resin in the extruder cylinder does not flow back into the fluid injection nozzle.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the fluid injection nozzle of the present invention is a fluid injection nozzle for injecting a fluid supplied from the outside into an extruder cylinder for resin molding,
A jumpsuit in which a through hole that is a fluid flow path is formed,
A body formed with a through hole for communicating the through hole and the inside of the extruder cylinder,
The outlet of the through-hole is urged by a spring that is not contracted by the negative pressure in the extruder cylinder, and is contracted when the pressure of the fluid in the through-hole becomes a predetermined pressure or more. A sealing portion housed in an intermediate portion of the through hole, which seals the outlet by contacting the outlet.
[0011]
The fluid injection nozzle of the present invention configured as described above, when injecting a fluid supplied from the outside into the extruder cylinder, contracts the spring by applying a pressure equal to or higher than a predetermined pressure to the fluid. The fluid is injected into the extruder cylinder by opening the outlet of the through hole. In addition, the spring that urges the sealing portion of the fluid injection nozzle of the present invention has no resin in the extruder cylinder, so that the inside of the extruder cylinder is in a vacuum state, that is, so that it does not contract even when a negative pressure is applied. Since it is set, even if the inside of the extruder cylinder is in a vacuum state, fluid does not flow into the extruder cylinder.
[0012]
Further, in the fluid injection nozzle of the present invention, the sealing portion has a ball, a ball receiving surface for receiving the ball, a through hole serving as a fluid flow path, and at least one groove communicating from the outer periphery to the through hole. And a ball receiver that receives a biasing force from a spring.
[0013]
Further, the fluid injection nozzle of the present invention is configured such that the resin pressure from the inside of the extruder cylinder presses the ball, which is pressed against the outlet of the communication portion that connects the intermediate portion side and the inside of the extruder cylinder to seal the outlet, and the ball. It may have a backflow prevention portion including a ball receiving surface for receiving, a through hole serving as a fluid flow path, and a ball receiver formed with at least one groove communicating from the outer periphery to the through hole. By having this backflow prevention part on the downstream side of the communicating part in the direction in which the fluid is supplied from the intermediate part, it is possible to prevent the resin in the extruder cylinder from flowing into the intermediate part. It is possible to prevent the spring and the sealing part housed in the above from malfunctioning due to the resin that has flowed in beforehand.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 shows a side sectional view of a fluid injection nozzle according to an embodiment of the present invention, which is attached to an extruder cylinder.
[0016]
The fluid injection nozzle 1 of the present embodiment is detachably attached to an extruder cylinder 20 and has a cylindrical main body 1a in which a through hole 10 is formed, and a fluid supplied from the outside, that is, a liquid or a gas. A hole 2 formed with a through hole 11 to be introduced into the through hole 10, and a liquid for preventing the liquid from flowing into the extruder cylinder 20 when the pressure inside the extruder cylinder 20 becomes negative. It has an inflow prevention unit 3 and a backflow prevention unit 4 for preventing backflow of resin from inside the extruder cylinder 20 into the fluid injection nozzle 1.
[0017]
The main body 1a of the fluid injection nozzle 1 of the present embodiment is configured to be screwed to the extruder cylinder 20, and the jumper 2 is screwed into the through hole 10 on the side where the liquid flows, and the liquid The ball receiver 5 of the backflow prevention unit 4 is screwed into the side from which the water is discharged, whereby the through hole 10 communicates the through hole 11 of the jumper 2 with the inside of the extruder cylinder 20. Further, the inflow prevention portion 3 is incorporated in the intermediate portion 10a of the through hole 10.
[0018]
The jumpsuit 2 is screwed into the main body 1 a as described above, and is further fixed by the lock nut 11. The jumper 2 also has a function of positioning a ball 6 urged by a spring 8, which will be described later.
[0019]
The inflow prevention portion 3 includes a ball 6 having a diameter larger than the inner diameter of the through hole 11 of the jumpsuit 2, a sealing portion 15 including a ball receiver 7 supporting the ball 6, and a spring 8 for urging the ball receiver 7. And the liner 9 held by the holding portion 10b.
[0020]
As shown in the plan view of FIG. 2A and the sectional side view of FIG. 2B, the ball receiver 7 has a cylindrical shape with a through-hole 7a formed therein. The ball receiving surface 7c is formed by chamfering to receive the ball. Further, four grooves 7b are formed on the upper surface 7d side to connect from the through hole 7a to the outer periphery 7f of the ball receiver 7. The groove 7b is a flow path through which the liquid flowing through the through hole 11 of the jumpsuit 2 passes. As described later, the liquid flows from the outer periphery 7f of the ball receiver 7 through the groove 7b to the through hole 7a. And flows in. The ball receiver 7 receives the urging force of the spring 8 on the lower surface 7e.
[0021]
The spring 8 is a coil spring, and its urging force is set so as not to contract only by the negative pressure in the extruder cylinder 20. Therefore, even when there is no resin pressure and the inside of the extruder cylinder 20 is in a vacuum state, Then, the ball 6 is pressed against the outlet 16 of the through hole 11 of the jumpsuit 2 via the ball receiver 7 and sealed. This prevents the liquid in the through hole 11 from flowing into the extruder cylinder 20. The spring 8 is set so as to contract when the pressure of the fluid in the through hole 11 becomes equal to or higher than a predetermined pressure. It is preferable that the spring load of the spring 8 be set in a range of about 300 to 1000 kPa.
[0022]
The liner 9 is for adjusting the stroke amount of the spring 8, and the liner 9 is also formed with a through hole through which the liquid passes.
[0023]
The backflow prevention unit 4 includes a ball 12 having a diameter larger than a diameter of an outlet 10d of a communication part 10c that communicates the intermediate part 10a and the extruder cylinder 20, a ball receiver 5 for receiving the ball 12, a main body 1a and a ball receiver. 5, and a packing 13 b for sealing between the extruder cylinder 20 and the ball receiver 5. The backflow prevention portion 4 is provided downstream of the intermediate portion 10a in the direction in which the liquid flows.
[0024]
The structure of the ball receiver 5 is basically the same as that of the ball receiver 7 described above. A ball receiving surface 5c for receiving the ball 12 is formed on the inner periphery of the upper surface side, and the ball receiver 5 penetrates through the through hole 5a and the outer periphery 5f. A plurality of grooves 5b extending to the hole 5a are formed.
[0025]
Next, the operation of the fluid injection nozzle of the present embodiment will be described with reference to FIG.
[0026]
First, the operation of the fluid injection nozzle 1 when the liquid is injected into the extruder cylinder 20 will be described with reference to FIG. In FIG. 3A, an arrow A indicates a liquid inflow path, and an arrow B indicates a state in which the inflow prevention unit 3 is pushed down.
[0027]
The liquid supplied from the outside at a predetermined pressure passes through the through hole 11 of the jumpsuit 2 and pushes down the ball 6 that has been in contact with the outlet 16 of the through hole 11. The liquid that has flowed into the intermediate portion 10a from the gap between the through hole 11 and the ball 6 flows into the through hole 7a from the groove 7b of the ball receiver 7, passes through the inside of the spring 8, and the through hole of the liner 9, and passes through the communication portion. Flows into 10c. The liquid that has flowed into the communication portion 10c flows from the groove 5b of the ball receiver 5 into the through hole 5a, and is injected into the extruder cylinder 20.
[0028]
Next, the operation of the fluid injection nozzle 1 in a state where the inside of the extruder cylinder 20 is in a vacuum state will be described with reference to FIG.
[0029]
Even when there is no resin in the extruder cylinder 20 and a vacuum state is established, the ball 6 is pressed against the outlet 16 of the through hole 11 because the spring 8 is set so as not to shrink due to this negative pressure. The state can be maintained, and the state in which the through hole 11 is sealed by the ball 6 can be maintained. Therefore, the liquid in the through hole 11 is prevented from flowing into the extruder cylinder 20.
[0030]
Next, the operation of the fluid injection nozzle 1 in a state where the resin pressure from the inside of the extruder cylinder 20 is applied will be described with reference to FIG.
[0031]
When the resin pressure from the inside of the extruder cylinder 20 is applied to the fluid injection nozzle 1 side, the ball 12 is lifted by the resin pressure and pressed against the outlet 10 d of the through hole 10. Thereby, the through-hole 10 is sealed, so that the resin from the extruder cylinder 20 can be prevented from flowing into the through-hole 10. That is, it is possible to prevent the resin from flowing into the intermediate portion 10a, and therefore, it is possible to prevent the resin 8 from entering the spring 8 and causing a malfunction.
[0032]
The predetermined pressure for supplying the liquid is equal to or higher than the pressure at which the spring 8 can be depressed, and when the resin pressure from the extruder cylinder 20 is applied to the fluid injection nozzle 1 side, the ball 12 is also depressed. Because of the necessity, a pressure higher than the resin pressure is applied.
[0033]
Further, in the present embodiment, the configuration in which the sealing portion 15 includes the ball 6 and the ball receiver 7 has been described as an example. However, the present invention is not limited thereto. If the configuration is such that the liquid is allowed to flow into the extruder cylinder 20 through the through-hole 10 when the outlet 16 is opened after sealing, for example, the ball 6 and the ball receiver 7 are integrally formed. The ball 6 may have a shape other than a spherical shape.
[0034]
【The invention's effect】
As described above, according to the fluid injection nozzle of the present invention, the penetration of the jumpsuit by the sealing portion urged by the spring set so as not to contract even when the inside of the extruder cylinder becomes a negative pressure. The outlet of the hole is sealed. Accordingly, it is possible to prevent the fluid from flowing into the extruder cylinder when the inside of the extruder cylinder is in a vacuum state. Further, since the backflow prevention portion is provided on the downstream side of the intermediate portion, the resin from the extruder cylinder can be prevented from flowing into the intermediate portion, and thus the spring and the sealing portion housed in the intermediate portion can be prevented. It is possible to prevent an operation failure due to the resin that has flowed in beforehand.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a fluid injection nozzle according to an embodiment of the present invention, attached to an extruder cylinder.
FIG. 2 is a plan view and a side sectional view of a ball receiver used in the fluid injection nozzle shown in FIG.
FIG. 3 is a view showing a state in which liquid is injected, a state in which liquid is prevented from flowing in a vacuum state in a cylinder, and a state in which resin is prevented from flowing backward in the fluid injection nozzle shown in FIG. It is.
FIG. 4 is a side sectional view of an example of a conventional fluid injection nozzle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fluid injection nozzle 1a Main body 2 Jumpsuit 3 Inflow prevention part 4 Backflow prevention part 5b, 7b Grooves 5a, 7a, 10, 11 Through holes 5c, 7c Ball receiving surface 5f, 7f Outer circumference 6, 12 Ball 7d Upper surface 7e Lower surface 8 Spring 9 Liner 10a Intermediate part 10b Holding part 10c Communication part 10d, 16 Outlet 11 Lock nut 13a, 13b Packing 15 Sealing part 20 Extruder cylinder

Claims (3)

In a fluid injection nozzle for injecting a fluid supplied from the outside into an extruder cylinder for resin molding,
A jumpsuit (2) having a through-hole (11) as a fluid flow path;
A main body (1a) having a through hole (10) for communicating the through hole (11) with the inside of the extruder cylinder (20);
A spring (8) set so as not to contract by the negative pressure in the extruder cylinder (20) and to contract when the pressure of the fluid in the through-hole (11) exceeds a predetermined pressure. The through hole (11) is housed in the intermediate portion (10a) of the through hole (10) which is urged and abuts on the outlet (16) of the through hole (11) to seal the outlet (16). A fluid injection nozzle having a sealing portion (15). The sealing portion (15) extends from the ball (6), a ball receiving surface (7c) receiving the ball (6), a through hole (7a) serving as a fluid flow path, and an outer periphery (7f) to the through hole (7f). The fluid injection nozzle according to claim 1, wherein at least one groove (7b) communicating with 7a) is formed, and a ball receiver (7) receiving a biasing force from the spring (8) on a lower surface (7e). . The resin pressure from the inside of the extruder cylinder (20) pushes the outlet (10d) of the communicating part (10c) that connects the intermediate part (10a) side and the inside of the extruder cylinder (20) to the outlet. (10d), a ball (12) for sealing, a ball receiving surface (5c) for receiving the ball (12), a through hole (5a) serving as a fluid flow path, and an outer periphery (5f) from the through hole (5a). The fluid injection nozzle according to claim 1 or 2, comprising a backflow prevention part (4) including a ball receiver (5) formed with at least one groove (5b) communicating with the nozzle.

Images