JPS6366587B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device and apparatus for opening and closing a nozzle through which a fluid such as a synthetic resin material flows out (hereinafter referred to as "injection").

BACKGROUND OF THE INVENTION As a nozzle for a conventional opening/closing device for fluids, an opening/closing valve utilizing the action of a spring or the like has been put into practical use. However, there are cases where it is not possible to completely control the outflow and stoppage of fluid only by the action of these valves. For example, in a cold region, the nozzle may be used for a fluid whose viscosity or the like changes physically or chemically in response to changes in temperature. In other words, when materials such as these become cold, their fluidity decreases and their viscosity increases, resulting in changes in the amount of outflow even though the nozzle opening is open, and in severe cases, they may stick together and eventually fail. may become impossible to drain.

In addition, it is possible to control the opening and closing of the nozzle opening for conventional injection molding sprues and runnerless devices used when resin material is injected into a mold to produce molded products. However, it is not possible to maintain the nozzle opening at the optimum temperature for the fluidity of the resin material. Therefore, a method has been adopted that attempts to achieve this objective by heating the nozzle opening. However, all of these methods involve attaching equipment such as a heater to the entire nozzle or the nozzle opening to maintain the appropriate temperature, and by controlling the heater current, the nozzle temperature is maintained at the appropriate temperature. It is. However, these conventional methods cannot provide the following essential solution. To put it simply, the nozzle opening is made of an alloy that has wear resistance due to its functional properties. For example, if a tungsten-containing alloy is used, the thermal conductivity is very low. It takes a considerable amount of time for the heat to heat from the outside and reach the inner wall of the inner hole of the nozzle through which the material passes, making it impossible to respond immediately to injection flow. Furthermore, materials with high hardness are susceptible to cracking when heated rapidly, and even if they do not crack, wear-resistant materials inevitably deteriorate due to thermal stress if heating is repeated thousands of times. Furthermore, in order to obtain extremely precise injection quantity, the most important thing is not the temperature of the nozzle opening, but the temperature of the material itself flowing through the inner hole, but this point is not taken into consideration at all.

As described above, it has not been possible to obtain an apparatus and equipment in which the amount of outflow can be precisely controlled. At the same time, synthetic resin injection equipment that requires very fine control is being developed recently, which means that the flow rate from the nozzle can be controlled accurately at all times without being affected by the outside temperature. Equipment and equipment are essential items that are in high demand.

This is the basis for providing the present invention. That is, the feature of the present invention is that the valve is opened and closed using a float (stop valve) that is a heating element installed in the nozzle, and the float is energized and generates heat to heat the fluid and operate under appropriate temperature conditions. This relates to equipment and equipment designed to prevent solidification due to low temperatures.

An embodiment of the present invention will be described in detail with reference to the drawings.

FIGS. 1 to 4 are external appearance and cross-sectional views of an embodiment of the present invention. 1 is a nozzle;
2 is a float, 3 is a packing material, 4 is a spring, 5 is a heating wire, and 6 is an insulating material.

1 is a stainless steel cylinder, which has a pore diameter portion at the tip 11 and is provided with a mouth portion for injecting 12 fluids;
Reference numeral 13 denotes a tapered portion that engages the main body portion of 1 and the nozzle opening 11 . It is also possible to manufacture these in the same body by molding.

Next, 2 is a float installed inside this 1, and its tip part 21 has an outer diameter that can fit and move freely within the hole diameter of 11.The rear end part 23 is the main body of 2. A gap 24 is formed between the main body of 1 and 1, which can be filled with the material flowing out from the nozzle port, and a pressurized fluid is injected from the port 12. When this occurs, the portion 23 is pushed toward the rear end, allowing fluid to flow out from the inner hole 11. FIG. 3 shows this state.
This shows that between 24' here and 24 in FIG. 2, 24' has a larger fluid storage space. When the liquid pressure injected from 12 is greater than the spring force of 4, the spring 24 is pushed and the float 2 retreats to the position shown in Figure 3.
It is a patsuking that moves along the inner wall of the building. This packing material has a hole in the center, and from there 2
An extension 25 at the rear end of the holder 25 passes through the holder. 4 is a spring which pushes the float 2 forward; this force is balanced by the pressure of the fluid flowing in from the port 12. Therefore, depending on the pressure and viscosity conditions of the fluid, it is necessary to consider the spring performance, material, etc. to be loaded.

Next, the details of the structure and function of the second heating element float, which is the most characteristic feature of the present invention, will be explained with reference to the drawings. FIG. 4 is a cross-sectional diagram. 5 is a heating wire, and this heating wire is also buried in the tip portion of 21. 6 is an insulating powder such as magnesia.
51 and 52 are terminals connected to lead wires. These outer shells are made of corrosion-resistant metal such as stainless steel.

The float of the heating element of the present invention has a small outer diameter part at the tip and a large outer diameter in the main body, and the part where the small outer diameter and the large outer diameter engage is tapered. It consists of parts. Since this part 22 can be brought into close contact with the inside of the taper 13, the fluid can be opened and closed accurately at this point.

By energizing the heating wire buried inside the float, the float itself can heat the fluid around it to an appropriate temperature. Furthermore, since the heat generation state of the float itself can be changed to the heat generation temperature at the tip portion and the main body portion, it also has the feature that it is possible to delicately control the outflow temperature.

This remarkable feature is that the wire diameter of the buried heating wire is different in size between the main body and the tip, which causes differences in heat generation conditions such as the time difference and amount of heat generated. be. This has a positive effect on the fluid being heated.

When the present invention is used as a nozzle opening, it can also be applied to various fuel nozzles, lubricant supply nozzles, writing ink supply nozzles, and the like. The reason is that it is possible to control a certain amount of outflow in each case. This is because performance such as accurate opening and closing can be achieved immediately.

Furthermore, the float of the present invention can be applied to conventional nozzle ports, so it has great marketability. Furthermore, since the fluid flowing out can be heated, it is far superior in terms of labor saving and efficiency compared to the conventional device which heats the device itself.

[Brief explanation of drawings]

FIGS. 1 to 4 are external and cross-sectional views of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Nozzle device, 11... Tip part, 12... Inflow port, 13... Taper part, 2... Floater (heating element), 2
1... Tip part, 22... Taper part, 23... Rear end part, 2
4, 24'... Gap portion, 25... Rear end extension portion, 3
...Packing material, 4...Spring, 5...Heating wire, 51,
52... Current-carrying terminal part, 6... Insulating powder such as magnesia.

Claims (1)

[Claims] 1 In a nozzle opening/closing device installed in a nozzle device, a float (heating element) having a small diameter portion and a large diameter portion, these portions are engaged in a tapered shape 22, and has a tip portion 21. 2, and a current-carrying heating wire 5 is buried in an insulating powder 6 in the inner core of the tip portion 21 to form a float 2 having current-carrying terminal portions 51, 52, and the small diameter portion is A nozzle opening/closing device for outflowing and supplying fluids, the tip end 21 of which can be freely fitted into the outflow hole diameter 11 of the nozzle 1.