JPH025166Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a double-acting solenoid valve that can adjust the valve opening degree in stages, and is particularly applicable to waste treatment equipment, water treatment equipment, and waste liquid. The present invention relates to a solenoid valve used in a liquefied gas supply system in processing equipment, refrigeration equipment, etc.

<Prior Art> Conventionally, as a solenoid valve whose opening degree can be changed in stages, for example, a plurality of plungers are arranged concentrically and stacked in a valve body, and
A plurality of drive coils are arranged in correspondence with the plungers, a valve body is integrally provided with the plunger on one end, and by sequentially energizing the drive coils, the amount of movement of the plungers is accumulated, and the valve body linked to the plunger is opened. A method in which the amount is adjusted in stages has been proposed (Utility Model Application Publication No. 177568, 1983).

<<Problems to be solved by the invention>> In the liquefied gas that is the object of the invention, the volume change between the liquid state and the gaseous state is extremely large, so even a slight difference in flow rate in the liquid state results in a large volume after vaporization. Therefore, it is required to accurately set the opening amount in each switching state of the valve.

However, in the conventional example, a valve body is formed on the most advanced plunger, the plunger is biased in the valve closing direction by a spring force, and the plunger is operated against the spring by the magnetic force of the drive coil. The plunger is designed to catch the plunger that is activated.

For this reason, in the conventional type, the plunger must be operated from the tip side, and when the drive coil is energized and the plunger is operated to the valve opening side, the actuated plunger and the receiving plunger are integrated, and the receiving plunger is integrated. The stop plunger will be affected by the magnetic force of the drive coil, and the plunger will be suspended due to the balance between the valve-closing force of the spring and the valve-opening force of the magnetic force. There is a problem in that the holding position is not stable and precise control of the valve opening amount cannot be performed.

Therefore, the conventional example cannot be used for stepwise control of the flow rate of liquefied gas.

<Means for Solving the Problems> The present invention provides a double-acting solenoid valve that can be used in a liquefied gas flow path. A double-acting electromagnetic valve comprising a valve element disposed facing a formed valve seat, a plunger made of a magnetic material for controlling the advance and retreat of the valve element, and a plurality of drive coils disposed in correspondence with the plunger, A plurality of plungers are arranged in series in the body, a valve stem insertion hole is provided in each plunger, and the valve stem extending from the valve element is inserted into the valve stem insertion hole, thereby connecting the valve stem and the plunger. By forming the plunger separately and arranging the plunger receiving piece on the valve stem in correspondence with the plunger, the forward and backward movement of the plunger is transmitted to the valve element via the valve stem, and each receiving piece and each plunger are arranged opposite to each other. The gap between the plunger and the valve face is formed so that it becomes narrower toward the valve element when the valve is in the closed position, and the plungers are operated in order from the side farthest from the valve element by the magnetic force of the drive coil, and the plungers are arranged between each plunger. The plunger movement limiter is fixed to the plunger on the side far from the valve via a non-magnetic material.

<<Operation>> In the present invention, a plurality of plungers are arranged in series within the valve body, and the valve stem extending from the valve element is inserted into the valve stem insertion hole provided in each plunger, so that the valve stem and the plunger can be connected to each other. are formed separately, and a plunger receiving piece is arranged on the valve stem in correspondence with the plunger, so that the movement of the plunger toward and away is transmitted to the valve element via the valve stem, and each receiving piece and each plunger are arranged opposite to each other. The gap between the face and the valve is formed so that it becomes narrower toward the valve head in the closed position, so by operating the plunger in order from the side farthest from the valve head, the plunger that moved first can be firmly fixed. Even if the magnetic force of the drive coil is sufficiently increased, the valve stem can be moved in and out by a certain amount, and there is a gap between the plunger and the plunger stopper. Since the valve is moved by the difference between the amount of movement of the plunger and the distance, the amount of valve opening can be controlled by a minute amount. Furthermore, since the plunger movement limiter disposed between each plunger is fixed to the plunger on the side far from the valve via a non-magnetic material, the magnetic force of the drive coil does not act on other plungers.

《Example》 Figure 1 shows a longitudinal cross-sectional view of a liquefied gas jet nozzle valve, in which a nozzle tip 2 is attached to the tip of a cylindrical valve body 1.
A liquefied gas outlet passage 3 is provided in the nozzle tip 2 in a tapered shape, and a valve seat 4 is formed at the inner end of the liquefied gas outlet passage 3. A valve element 5 is disposed within the valve body 1 to face the valve seat 4, and a rod-shaped body 6 protruding from the valve element 5 projects into the liquefied gas outlet passage 3.

A plunger 7 made of a magnetic material is installed inside the valve body 1 so as to be slidable using the inner surface of the valve body 1 as a guide surface. The plunger 7 is divided into three parts, and each divided plunger 7a, 7b, 7c has a valve stem insertion hole 8.
is transparently provided, and the valve stem 9 extending from the valve element 5 and each of the divided plungers 7a, 7b, 7c can be interlocked with each other by a plunger receiving piece 10 fitted to the valve stem 9.

A fixed magnetic body 11 is fixed so as to be adjustable in position inside the base end of the valve body 1, and a valve closing mechanism is provided between the fixed magnetic body 11 and the plunger receiving piece 10 located on the protruding tip side of the valve stem 9. A force spring 12 is arranged.

The first plunger 7 located on the far side from the valve 5
A movement limiter 13 for the second plunger 7b is arranged between the second plunger 7b and the second plunger 7b, and the movement limiter 13 is fixed to the first plunger 7a via a non-magnetic material 14. , a second plunger 7b and a third plunger 7c located on the valve side.
There is also a movement limiter 13 of the third plunger 7c between the
The movement limiter 13 is fixed to the second plunger 7b via a non-magnetic material 14.

A recessed hole 15 is formed in the fixed magnetic body side end surface of each plunger 7a, 7b, 7c, and a plunger receiving piece 10 is located in each recessed hole 15. The distance L between the hole 15 and the bottom wall is formed to be narrower as the plunger is located closer to the valve element in the valve closed position. In addition, in the valve closed position, there is a gap between the bottom wall of the recessed hole 15 in the first plunger 7a and the plunger receiving piece 10 facing thereto.
_L1 is formed to be smaller than S between the first plunger 7a and the fixed magnetic body 11.

Each plunger 7a, 7 is provided on the outer periphery of the valve body 1.
Driving coils 16 are arranged corresponding to b and 7c.

In the figure, reference numeral 17 is a liquefied gas inlet, 18 is a fluid passage within the valve body, and the valve element 5 located within this fluid passage 18 is formed in a polygonal shape as shown in FIG. Fluid can flow between the inner peripheral surface of the valve element 5 and the valve element 5.

Incidentally, a groove 19 is formed in the circumferential surface of the plunger 7 and the plunger movement limiter 13 in the axial direction, and a part of the fluid flows from the groove 19 toward the fixed magnetic body 11 to prevent the plunger 7 from moving. The same fluid pressure is applied to both sides.

Next, the distance S between the first plunger 7a and the fixed magnetic body 11 is 9 mm, and the distance between the plunger catch 10 and the bottom wall of the recessed hole in the first plunger 7a is 6 mm.
mm, the distance between the plunger holder 10 and the bottom wall of the recessed hole in the second plunger 7b is set to 3 mm,
In the third plunger 7c, the plunger stopper 10
The operation in a state where it is brought into contact with the bottom wall of the recessed hole will be explained with reference to FIG.

FIG. 3A shows the valve in the closed position, where L 1 is 6 mm between the plunger holder 10 and the recess 15 in the first plunger 7a, and the distance _L1 between the plunger holder 10 and the recess in the second plunger 7b is 6 mm. Between the hole 15 = L ₂ is 3 mm, and between the plunger holder 10 and the recessed hole 15 in the third plunger 7c = L ₃ is 0, and the valve element 5 and valve seat 4 are in contact. are doing.

FIG. 3B shows a state in which only the drive coil 16 corresponding to the first plunger 7a is energized from the state of FIG. 3A, and the magnetic force generated in the drive coil 16 causes
The first plunger 7a moves toward the fixed magnetic body 11 side. At this time, since the magnetic force of the drive coil is also acting on the fixed magnetic body 11, the fixed magnetic body 11 and the first
The plunger 7a is attracted to the plunger 7a. The amount of movement of this first plunger 7a is 9 mm, but
6 between the plunger stopper 10 and the bottom wall of the recessed hole.
Since there is a distance between mm, the valve stem is retracted by 3 mm. Therefore, there is also a gap of 3 mm between the valve element 5 and the valve seat 4. Since the non-magnetic material 14 is fixed to the second plunger 7b side of the first plunger 7a, even if the first plunger 7a is excited by the drive coil 16, the influence of the magnetic force is absorbed by the second plunger 7.
It has no effect on b.

3C shows a state in which the drive coil 16 corresponding to the second plunger 7b is energized from the state shown in FIG. 3B, and the magnetic force of the drive coil 16 moves the second plunger 7b toward the first plunger 7a. The first plunger 7a moves 9mm, which is the same as the amount of movement of the first plunger 7a, but the first plunger
Due to the movement of the plunger 7a, the valve stem 9 is pulled up by 3 mm, and the distance _L2 between the bottom wall of the recessed hole of the second plunger 7b and the plunger stopper 10 is 6 mm. The amount of retraction of the valve stem 9 due to the movement of 7b is 3 mm. As a result, a gap of 6 mm is created between the valve element 5 and the valve seat 4. Even in this case, since the non-magnetic material is fixed to the second plunger 7b, even if the second plunger 7b is excited, the influence of the magnetic force will not appear on the third plunger 7c.

FIG. 3D shows a state in which the drive coil 16 corresponding to the third plunger 7c is energized from the state shown in FIG. The valve stem 9 is moved by 9 mm, which is equal to the amount of movement of the plunger 7b, but due to the movement of the second plunger 7b, the valve stem 9 is pulled up by 6 mm from the valve closing position, and the bottom wall of the recessed hole of the third plunger 7c and the plunger retainer 10 are moved. Since L ₃ is 6 mm, the third plunger 7c
The amount of retraction of the valve stem 9 due to the movement of is 3 mm. As a result, a distance of 9 mm is created between the valve element 5 and the valve seat 4.

<<Effects of the invention>> The invention comprises a body having a fluid passage therein, a valve element disposed to face a valve seat formed in the body, and a plunger made of a magnetic material for controlling the advance and retreat of the valve element. , a double-acting electromagnetic valve consisting of a plurality of drive coils arranged in correspondence with the plungers, in which a plurality of plungers are arranged in series in the body, each plunger is provided with a valve stem insertion hole, and the valve stem is inserted through the valve stem. By inserting the valve stem extending from the valve into the hole, the valve stem and the plunger are formed separately, and by arranging the plunger receiving piece on the valve stem in correspondence with the plunger, the plunger can be moved back and forth. The information is transmitted to the valve element via the valve stem, and the space between each receiving piece and the opposing surface of each plunger is formed so that it becomes narrower toward the valve element in the valve closed position. By operating the plunger in order from the farthest side, the plunger that moved first can be held securely in a fixed state.
Even if the magnetic force of the drive coil is sufficiently increased, the valve stem can be moved in and out by a certain amount. This results in
Even if there is a current fluctuation, the separation distance between the valve element and the valve seat can be maintained correctly, so the accuracy of valve opening amount control can be improved.

In addition, since the plunger movement limiter placed between each plunger is fixed to the plunger on the side far from the valve element via a non-magnetic material, even if the plunger that has moved is energized, its magnetic force will be stronger than that of the valve element. Since it does not affect the plunger located on the side, the plunger does not start moving unexpectedly.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is an explanatory diagram of the operating state. 1...Body, 4...Bent seat, 5...Bentko, 7...
...Plunger, 8...Valve stem insertion hole, 9...Valve stem,
10... Plunger receiving piece, 11... Spring receiver (fixed magnetic material), 12... Elastic body, 13... Plunger movement limiter, 14... Non-magnetic material.

Claims (1)

[Claims for Utility Model Registration] 1. A body 1 having a fluid passage therein, a valve 5 disposed to face a valve seat 4 formed in the body 1, and controlling the valve 5 to advance and retreat. In a double-acting electromagnetic valve consisting of a plunger 7 made of a magnetic material and a plurality of drive coils 16 arranged in correspondence with the plunger 7, a plurality of plungers 7 are arranged in series within the body 1, and each plunger 7 has a valve. A rod insertion hole 8 is provided through the valve rod insertion hole 8.
A valve stem 9 extending from the valve stem 5 is inserted into the valve body 5, and an elastic body 12 is mounted between the protruding tip of the valve stem 9 and a spring holder 11 provided on the body 1 to close the valve 5. A plunger receiving piece 10 is formed at a position corresponding to each plunger 7 on the valve stem 9, and a gap L between each receiving piece 10 and the opposing surface of each plunger 7 is formed. The valve is formed so that it becomes narrower toward the valve element in the closed position, and a plunger movement limiter 13 is arranged between each plunger 7, and the plunger movement limiter 13 is attached to the plunger 7 on the side far from the valve element 5 using a non-magnetic material. 1. A double-acting solenoid valve for liquefied gas, characterized in that it is fixed via a valve 14. 2. The double-acting electromagnetic valve for liquefied gas according to claim 1, in which the spring holder 11 is fixed to the body 1 so as to be adjustable forward and backward.