JPS62137481A - Solenoid valve for use in hydraulic burner - Google Patents

Abstract

PURPOSE:To make it possible to easily control feeding oil quantity and returning oil quantity for a hydraulic burner by forming, on a piston, a notch whose oil passage area gradually changes by the sliding with a cylinder and simultane ously shifting the piston by means of an electromagnet optionally. CONSTITUTION:A piston 3 is stored, inside the free cylinder 4 of a solenoid valve main body 1 with a lower spring 5 pinched therein while on the other hand, a notch 3a, which is directed along the axial direction and gradually deepened as it goes toward the oil outlet side 2, is formed on the surface of this piston 3. When voltage is applied to a bobbin coil 14, a power plunger 6 and a fixed magnetic head 9 attract each other and then the piston 3 united in a body with the power plunger 6 also shifts to the specified position. When the piston 3 shifts, the end of the V notch 3a is projected from the end of the free cylinder 4 and oil of a quantity corresponding to the quantity of its projec tion can be passed from an oil inlet P to the oil outlet 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Related Industrial Field) The present invention relates to improvements in solenoid valves used in hydraulic burners.

(Prior art) Conventionally, when the combustion amount of a hydraulic burner is changed steplessly by supply oil pressure or return oil pressure, the fuel control part and its driving part are each installed separately, and these are connected to each other by a linkage or the like. Ta. For this reason, it was very important to achieve uniform control of the combustion amount by adjusting the position, angle, etc. of the linkage. Furthermore, the control part requires precision, and it has been difficult to mass produce products with uniform control performance, especially for small hydraulic burners.

(Problems and Objectives to be Solved by the Invention) In view of the problems of the prior art, it is an object of the present invention to automatically control the grooves on both sides of the supply hydraulic pressure control or return hydraulic pressure control of a hydraulic burner, and to do so at a low cost. be.

(Solution) A groove is provided that can slide in close contact with the free cylinder provided in the main body, and the oil passage area formed between the free cylinder and the free cylinder gradually changes toward the oil outlet side. comprising a piston and a drive device that moves the piston in a direction where the oil passage area of the if & It is characterized in that it is performed by.

(First Example) This will be explained based on FIG. 1. A is a solenoid valve according to the present invention, 1
is its main body, which has an oil outlet 2 at its tip, is hollow in the center, and screws 1 and 3 are fitted concentrically into this N. The piston 3 is housed in a precision-machined free cylinder 4 with a lower spring 5 in between. 3a is a plurality of V grooves provided in the axial direction of the piston 3, and the depth of the V grooves gradually increases toward the oil outlet 2. Reference numeral 6 denotes a power plunger integrated with the piston 3, which is slidably inserted into a guide case 7 sealed with a circle ring 8 with respect to the main body 1.

The power plunger 6 has a hollow center, and an upper spring 1o fitted therein is housed between the power plunger 6 and a fixed magnetic head 9 made of a magnetic material. Reference numeral 6a denotes an oil hole in the power plunger 6, which communicates the hollow portion into which the upper spring 10 is fitted and the oil chamber 11 formed on the outside of the free cylinder 4. The fixed magnetic head 9 has an oil hole 9a in the center, and the oil hole 9a communicates with the oil inlet 12a of the oil inlet joint 12.

13 is a lower plate fixed to the main body 1 with screws 13a. 1
A bobbin coil 4 is wound around the lower plate 13, the guide case 7, and the oil inlet joint 12. 15 is a cap of the bobbin coil 14, which is connected to the lower plate 13 and the oil inlet joint 12.
It is fixed with a washer 16 fitted in. 17 is an electric wire.

The solenoid valve A having the above configuration is installed between the oil supply circuit from the oil pump 18 to the burner 19 and the return pipe to the oil tank as shown in FIG. 3, and controls the oil pressure of the burner 19 steplessly. The amount of oil can be controlled steplessly.

FIG. 4 shows an example in which the amount of oil is controlled steplessly by installing the electromagnetic valve of the present invention in the oil return line from the nozzle of the burner 19 to steplessly change the amount of oil returned from the nozzle of the burner 19. ,ru.

In addition to the hydraulic burner, by inserting this electromagnetic valve into the conduit through which other liquids flow, as shown in FIG. 5, the flow rate can be varied steplessly.

(Function) When oil at a certain pressure P (kg/cJ) is supplied from the oil inlet 12a, the supplied oil flows through the oil inlet joint 12 → the oil hole 9a in the fixed magnetic head 9 → the inside of the power plunger 6. The oil passes through the oil hole 6a and flows into the oil chamber 11.

Then, the flow of oil is stopped at the part of the free cylinder 4 and piston 3 that are fitted to each other so as to be airtight and have almost no oil leakage.

In this state, when a voltage is gradually applied to the bobbin coil 14, the power plunger 6 and the fixed magnetic head 9 are attracted to each other, and the power plunger 6 is gradually pulled toward the right side in the figure.

When the power plunger 6 is pulled to a predetermined position.

The piston 3, which is integrated with the power plunger 6, is also pulled to a predetermined position at the same time. Then, the right end of the V-groove 3a provided in the piston 3 comes out further to the right than the right end of the free cylinder 4, so the groove 3a begins to function as an oil outlet groove. Therefore, oil supplied from the oil inlet 12a is supplied from the oil chamber 11 in the main body 1 through the oil outlet 2.

When the voltage applied to the coil 14 is further increased, the power plunger 6 is further pulled up to the right, the opening area of the groove becomes larger, and a large amount of the supplied oil is returned to the oil tank through the oil outlet 2. In this way, the bobbin coil 14
The amount of oil can be changed steplessly by gradually increasing or decreasing the voltage applied to the pump. The exit and entrance may be reversed.

The voltage applied to the bobbin coil 14 is a half-wave rectified voltage, a phase control voltage, a pulse frequency (constant voltage), a pulse voltage,
Any DC voltage or the like is possible.

When the applied voltage is within the above-mentioned half-wave rectified voltage, phase control voltage, pulse frequency, and pulse voltage, the power franchisor 6 and the piston 3 move while making a piston movement within the free cylinder 4 according to the supplied frequency. This will change the amount of oil spilled.

Note that the structure for moving the piston 3 up and down is not limited to applying voltage to the bobbin coil 14, but may also be controlled by directly connecting the piston 3 to a diaphragm valve or by air pressure.

Further, since the power plunger 6 and the piston 3 can be brought into close contact with each other by the upper and lower springs, there is no problem even if they are separated.

(Second embodiment) This will be explained based on FIG. 2. Reference numeral 1 designates the main body of the electromagnetic valve A', which has an oil outlet 2 at its tip, is hollow in the center, and has a piston 3 fitted concentrically into the saw. The piston 3 is housed in a precision-machined free cylinder 4 with a lower spring 5 in between.

3a is a plurality of grooves provided in the axial direction of the piston 3;
The depth of the groove becomes shallower toward the oil outlet 2. Reference numeral 6 denotes a power plunger that is separate from the piston 3 (although it may be integrated with the piston 3), and is slidably inserted into a guide case 7 made of a non-magnetic material. The power plunger 6 has a hollow center, and an upper spring 10 fitted therein is housed between the power plunger 6 and a fixed magnetic head 9 made of a magnetic material. Reference numeral 6a denotes an oil hole in the power plunger 6, which communicates the hollow portion into which the upper spring 10 is fitted and the oil chamber 11 formed on the outside of the cylinder 4. The fixed magnetic head 9 has an oil hole 9a in the center, and the oil hole 9a communicates with the oil inlet 12a of the oil inlet joint 12.

13 is a lower plate fixed to the main body 1 with screws 13a. 1
A bobbin coil 4 is wound around the lower plate 13, the guide case 7, and the oil inlet joint 12. 15 is a cap of the bobbin coil 14, which is connected to the lower plate 13 and the oil inlet joint 12.
It is fixed with a washer 16 fitted in. 17 is an electric wire.

(Operation of the second embodiment) When oil at a certain pressure P is supplied from the oil inlet 12a, the supplied oil flows through the oil inlet joint 12 → the oil hole 9a in the fixed magnetic head 9 → the inside of the power plunger 6. Through, oil hole 6a
→Flows into the oil chamber 11. Then, the flow of oil is stopped at the part of the free cylinder 4 and the piston 3 that are made airtight and fit together with almost no oil leakage.

In this state, when voltage is gradually applied to the bobbin coil 14, the power plunger 6 moves to the fixed magnetic head 9.
repel each other, and the power plunger 6 is pushed little by little toward the left side in the figure.

When the power plunger 6 is pushed to a predetermined position, the piston 3, which is separate and coaxially engaged with the power plunger 6,
is also pushed to a predetermined position at the same time. Then, the depth of the groove 3a provided in the piston 3 becomes deeper.

Groove 3a begins to function as an oil outlet groove. Therefore, oil supplied from the oil inlet 12a is supplied from the oil chamber 11 in the main body 1 through the oil outlet 2.

When the voltage applied to the coil 14 is further increased, the power plunger 6 is further pushed to the left, the opening area of the groove 3a becomes larger, and a large amount of supplied oil is supplied through the oil outlet 2. In this way, by gradually increasing or decreasing the voltage applied to the bobbin coil 14, the oil amount can be changed steplessly. Note that the entrance and exit may be reversed.

(Effects) A groove (tapered groove) that is inside the main body and can slide in close contact with the free cylinder, and the area of the oil passage formed between the free cylinder and the free cylinder gradually changes toward the oil outlet side. The fixed magnetic head and the power plunger are attracted to each other by applying a voltage to the bobbin coil of the driving device, which moves the piston having a piston (including This is done by pulling or pressing by repelling each other.

With this configuration, 1) the oil flow rate can be changed steplessly with uniformity;

2) Since the movable part and the driving part are integrated, the device has become very compact.

3) An automatic oil amount control device can be provided at low cost.

4) Since the piston is provided with a groove that gradually becomes larger and the oil passage is controlled by moving the groove, burner failures due to dirt clogging, etc. are eliminated.

5) Since the drive is direct drive, controllability has been greatly improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention. FIG. 2 is a sectional view of the second embodiment. 3, 4 and 5 show examples of piping of the solenoid valve of the present invention to a small burner circuit. In the figure: 1 Main body 2 Oil outlet 3 Piston 3a V groove 4 Free cylinder 5 Lower spring 6 Power plunger 6a Oil hole 7 Guide case 80 ring 9 Fixed magnetic head 9a Oil hole
10 Upper spring 11 Oil chamber 12 Oil inlet joint 13 Lower plate 14 Bobbin coil 15 Cap 16 Washer 17
Electric wire 18 Oil pump 19 Burner 20.21 Pipe line or more

Claims (1)

[Scope of Claims] [1] An oil passage that is slidable in close contact with the free cylinder (4) provided in the main body and is formed between the free cylinder (4) and the free cylinder (4) toward the oil outlet side. A piston (3) provided with a groove (3a) whose area gradually changes, and a drive device for moving the piston (3) in a direction in which the oil passage area of the groove (3a) increases, the drive The device is a solenoid valve used in a hydraulic burner, characterized in that a fixed magnetic head (9) and a power plunger (6) pull or press each other by applying voltage to a bobbin coil (14). . [2] Phase control of the voltage applied to the piston drive device;
A solenoid valve for use in a hydraulic burner according to claim [1], characterized in that it is a device that operates by pulse transmission number control, pulse width control, DC voltage control, and AC voltage control.