JP2014037872A - Electromagnetic type cutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light electromagnetic type cutoff valve using a combined valve at high response, and with a space-saving property and excellent durability.SOLUTION: A valve body 61 of an electromagnetic cutoff valve is freely fitted in a cylindrical body whose tip face projecting at a tip of a plunger 51 is opened and on which an opening 67 is formed at a predetermined position at a base end of a peripheral wall movably in an axial line direction by a predetermined distance and non-detachably in a tip direction. A communication hole 91 communicating the tip face of the valve body with a base end face is formed. A main valve body 63 with a main valve seat 64 of a valve chamber bottom part 82 as a valve seat is formed on the tip face, and a pilot valve body 62 with a pilot valve seat 65 on the tip face of the plunger as a valve seat is formed on the base end face. When the plunger is sucked in a base end direction by an electromagnetic force, only the plunger is pulled, and the pilot valve seat on the tip face of the plunger is separated from the pilot valve body and opened. After a differential pressure between a fuel flow inlet 71 side and an exhaust port 72 side is dissolved, the main valve body is raised and opened.

Description

  The present invention relates to an electromagnetic shut-off valve.

  Conventionally, when a high-pressure gaseous fuel such as CNG is supplied to a gas engine or the like, an electromagnetic shut-off valve has been installed in the fuel passage, and many are formed in a block body as shown in FIG. A valve chamber is formed at the communicating portion between the inflow port and the discharge port, and the valve chamber is normally urged in a closing direction by a spring to close the discharge port. 2. Description of the Related Art An electromagnetic shut-off valve having a configuration in which a plunger is magnetized and pulled against a biasing force of a spring and moved to a proximal end side to open a valve element disposed on the distal end side of the plunger is often used.

  However, in the electromagnetic shut-off valve, as shown in FIG. 5, when the valve is in a closed state, in addition to the biasing force of the spring, a force that presses the valve in the direction of closing the valve acts greatly. It is difficult to open the main valve 63 independently only by the attractive force of the magnetized plunger (force to move the valve in the opening direction) with a magnetic field generated by energizing a general coil. In order to require an extremely large electromagnetic force, there is a problem that a large electromagnet having a large main cylinder force must be used.

  Therefore, as means for solving this problem, as shown in FIG. 6, for example, two plungers are provided, and a main plunger 51 and a sub-plunger 52 are provided on the outside thereof. The solenoid valve has a structure in which the pilot valve 62 is disposed, the main plunger 63 is disposed in the sub plunger 52, and the main plunger 51 and the sub plunger 52 are coupled by the coupling pin 101. A valve has been proposed.

  In the electromagnetic shut-off valve, when electricity is supplied, a magnetic field is generated in the valve chamber by the supplied current and coil, and the main plunger 51 is magnetized, so that the pilot valve 62 is driven by the main plunger 51. Sucked.

  Since the pilot valve 62 has a closed seat diameter smaller than that of the main valve 63, the pressing force applied in the valve closing direction is smaller than that of the main valve 63. Thus, the pilot valve 62 can be attracted by the magnetic force of the coil of the main plunger 51.

  When the pilot valve 62 is opened, the gas fuel flows in from the pilot valve 62, so that the differential pressure from the downstream side of the main valve 63 is eliminated.

  When the force in the valve closing direction becomes weaker and the suction force becomes larger, the main plunger 51 further sucks the valve body, thereby interlocking the sub-plunger 52 connected by the connecting pin. The main valve 63 can be opened.

  However, in such an electromagnetic shut-off valve, since it is necessary to provide a two-stage independent plunger and valve body, the plunger space for the whole shut-off valve increases, and the plunger to be operated operates. There is a problem that the total weight increases due to the increase in weight.

  Further, since two independent devices are used, there is a problem of durability and failure due to poor response performance and complexity of the device.

  Therefore, Patent Document 1 discloses an electromagnetic shut-off valve having a valve structure in which a plunger is integrated and a pilot valve and a main valve are integrated.

  In the electromagnetic shut-off valve shown in Patent Document 1, a plunger and a valve body having a distal end side as a main valve and a proximal end side as a pilot valve are connected by pins with a certain degree of mobility. It is the structure which solves said subject.

  Also in the structure of the electromagnetic shut-off valve, the contact portion with the plunger on the upper part of the valve body serves as a pilot valve, so that the problem at the time of valve opening due to the differential pressure at the time of valve opening can be solved. .

  However, this electromagnetic shut-off valve has a connecting pin with a plunger and a valve body installed in a long hole formed in the valve body. The burden on the pin during operation is large, and the pin or the valve body may be damaged due to contact with the valve body, resulting in a problem in durability.

JP2010-1916

  The present invention uses a combined valve with a conventional sub-plunger function added to the inside of the main plunger to solve the problems of the electromagnetic shut-off valve. It is an object to provide an electromagnetic shut-off valve that is not only lightweight but also excellent in durability.

The present invention made in order to solve the above problems is arranged in a fuel passage for sending gas fuel, and a valve port is formed at a communication portion between an inlet and an outlet formed in a block body, A valve seat communicating with the discharge port is formed at the valve port,
And, a plunger provided with a valve body at the tip is disposed in the valve chamber formed in the block body, facing the valve seat of the valve port,
Normally, the plunger that is attracted by the electromagnetic force of the electromagnet disposed around the valve chamber is closed by applying a biasing force in the valve chamber closing direction to close the valve port formed in the valve seat, A shutoff valve that pulls the plunger against the urging force in the proximal direction to open the valve port of the valve seat to open the inflow port and the discharge port,
The valve body is movable in the axial direction by a predetermined distance into a cylindrical body that opens at least a distal end surface projecting from the distal end of the plunger and forms an opening at a predetermined position at the proximal end portion of the peripheral wall. And it is loosely fitted in the tip direction so as not to be removable,
Further, the valve body forms a communication hole that communicates the distal end surface and the proximal end surface of the valve body, and a main valve body having a valve seat as a main valve seat at the bottom of the valve chamber is formed on the proximal end surface of the distal end surface. Are respectively formed with pilot valve bodies having a pilot valve seat on the tip surface of the plunger as a valve seat,
At the time of shutting off the valve body, the plunger is urged in the distal direction, the valve body is sandwiched between the valve seat and the pilot valve seat, and the main valve and the pilot valve are closed. Shut off the gas fuel,
When the plunger is attracted in the proximal direction against the biasing force by the electromagnetic force, the main valve element is attached to the valve seat due to the differential pressure between the inlet side and the outlet side. Sometimes, only the plunger is pulled, and the pilot valve seat on the front end surface of the plunger is opened away from the pilot valve body, and from the opening formed in the cylindrical body leading to the outflow port, the valve body The inflow port and the discharge port communicate with each other through a communication hole penetrating from the distal end surface to the proximal end surface,
A differential pressure between the inlet and the outlet is eliminated, and the main valve is opened by lifting the valve body together with the plunger.

  Further, at least one hole for communicating the inlet and the outlet formed in the valve chamber through which gas fuel flows when the pilot valve is opened on the peripheral wall of the accommodating portion of the plunger At least one of the main valve or the pilot valve provided at the front end or the base end of the valve body is formed so as to project annularly with respect to the front end or the base end.

  Further, in the present invention, the entire valve body is molded from a resin having appropriate elasticity, or a base portion of the valve body is formed of metal or the like, and a contact portion with the valve seat of the valve body Is characterized by being molded of an elastic body.

  According to the present invention, there is provided an electromagnetic shut-off valve that is highly responsive under high pressure conditions, is space-saving, and is reduced in weight.

The cross-sectional schematic diagram of the electromagnetic shut-off valve which concerns on this invention. Cross-sectional operation explanatory drawing of the valve body of the electromagnetic shut-off valve which concerns on this invention. Another embodiment of the valve body. Another embodiment of the valve body. The cross-sectional schematic diagram of the conventional general electromagnetic shut-off valve. The cross-sectional schematic diagram of the general electromagnetic cutoff valve for the conventional high pressure gas.

  Hereinafter, preferred embodiments of the present invention will be described in detail.

  The electromagnetic shut-off valve according to the present invention shown in FIG. 1 has the same structure as that of the conventional shut-off valve shown in FIG.

  However, as shown in FIG. 5, in the conventional general shutoff valve, since the plunger 51 and the valve body are not separated, the suction force of the plunger 51 remains as it is to open the discharge port 72. Is arranged.

  If it is a conventional fuel supply shut-off valve that does not use ordinary high-pressure fuel, there is almost no problem of differential pressure on the inlet side and outlet side, so this method can be used without problems, When a high-pressure fuel such as CNG is used, the pressure in the valve closing direction is large, and the urging force of the pressure and the spring 4 exceeds the suction force of the plunger 51. It may be difficult to open the valve only with the suction force of the jar 51.

  The electromagnetic shut-off valve according to the present invention is disposed in a fuel passage for sending gas fuel, and a valve port 73 is formed at a communication portion between the inlet 71 and the outlet 72 formed in the block body. .

  The valve port 73 normally includes a plunger 51 that urges the valve body 61 in the closing direction and moves the valve body 61 in the opening direction against the urging force by electromagnetic force, and a drain opening at the tip of the valve port 73. A valve body 61 for opening and closing the outlet 72 is inserted.

  The valve body 61 has a main valve 63 having a peripheral edge of the discharge port 72 as a main valve seat 64 at a distal end and a pilot valve 62 having a distal end of the plunger 51 as a pilot valve seat 65 at a proximal end. doing.

  In addition, the valve body 61 is formed with a communication hole 91 that passes through the distal end and the proximal end.

  In the electromagnetic shut-off valve, when the plunger is pulled against the biasing force by the electromagnetic force, only the plunger 51 is first pulled to open the pilot valve 62 and penetrate the valve body 61. The inflow port 71 and the discharge port 72 communicate with each other through the communication hole 91, so that the differential pressure from the downstream side is eliminated, and the main valve 63 is opened by retracting the plunger 51 together with the valve body 61. To do.

  In particular, in the present embodiment, the valve body 61 is formed in a cylindrical shape projecting from the tip of the plunger 51 and is open at the tip so that it can move by a predetermined distance in the opening / closing direction. An opening 67 that is housed in a non-removable manner from the formed opening and that communicates with the outlet 72 when the pilot valve 62 is opened by pulling at least the plunger 51 into the peripheral wall of the housing. Is formed.

  Specifically, the valve body 61 is accommodated in the housing portion 54 of the plunger 51, and the annular ridge 66 of the valve body 61 is connected to the inner peripheral edge of the housing portion 54 of the plunger 51. By being locked by a valve body locking portion 53 projecting inwardly, the plunger 51 is connected to the plunger 51 so as to be able to reciprocate within a predetermined width.

  In addition, the valve body latching | locking part 53 is formed in the flange shape protruded inwardly at the inner peripheral part of the housing part 54, or the some bent | flunged inwardly arrange | positioned at predetermined intervals in a week direction. Further, the attachment method of the valve body locking portion 53 is not particularly limited, but a material having sufficient durability so as not to be damaged by contact with the valve body 61 is used. Although an attachment method is selected, for example, means such as caulking a metal link or fixing by a laser welding can be considered.

  When the force in the valve closing direction exceeds the suction force of the plunger 51 due to the pressure at the time of valve closing, first, the pressure concerned first is small, and the pilot valve 62 provided on one side of the valve opens. By doing so, the pressure is reduced below the suction force of the plunger 51, and the main valve 63 provided on the other side of the valve body is opened to open the valve.

  Here, the valve body 61 disposed in the valve chamber 81 has a proximal end on the plunger 51 side and a distal end on the discharge port 72 side. A pilot valve seat 65, a valve is provided at the distal end of the plunger 51. A main valve seat 64 is provided at the peripheral edge of the mouth, and the valve is opened and closed by contacting the valve seat and the valve body.

  In the present embodiment, the diameter (seat diameter) of the opening 67 on which the pilot valve 62 acts is φ1 mm, and the diameter (seat diameter) of the valve port 73 on which the main valve 63 acts is φ6.5 mm.

  Next, the operation of the electromagnetic shut-off valve according to the present invention will be described with reference to the explanatory diagram shown in FIG.

  FIG. 2 shows three patterns as sectional views of the operating states of the pilot valve 62 and the main valve 63.

  Here, FIG. 2A shows a state where both the pilot valve 62 and the main valve 63 are closed.

  That is, the plunger 51 is urged toward the valve chamber lower part 82 by the compression spring 4, and the main valve 63 is brought into close contact with the main valve seat 65 to close the valve port 73.

  And gaseous fuel is sent out from a fuel cylinder, and the flow path introduced into an engine is interrupted.

  At this time, the plunger 51 is in close contact with the pilot valve 62 by the urging force of the compression spring 4, closes the opening 67 and closes the communication hole 91.

  In this case, since the valve closing pressure and the urging force of the return spring 4 are applied to the valve body 61, the main valve 63 applied to the valve port 73 connected to the discharge port 72 only by the suction force of the plunger 51 is opened. It becomes difficult to speak.

  FIG. 2B is a cross-sectional view showing a state where the plunger 51 is slightly sucked, the pilot valve 62 is opened, and the main valve 63 is closed.

  Therefore, in order to control the shut-off valve with good responsiveness, the pilot valve 62 provided on the side of the valve body 61 connected to the plunger 51 on the side in contact with the plunger 51 is opened first.

  Then, as shown in the enlarged view of FIG. 2 (b), the plunger is lifted and the pilot valve 62 is opened. As shown in the enlarged view of FIG. As described above, the fuel gas flows through the vent hole 55 to the discharge port 72.

  As a result, the main valve 63 can be easily opened by reducing the pressure difference between the inlet 71 side and the outlet 72 side.

  Here, the reason that the pilot valve 62 can be opened by the suction force of the plunger 51 is that, generally, the smaller the seat diameter, the smaller the pressure applied in the direction of closing the valve body. The seat diameter of the communication hole 91 connected to the opening 67 on which the pilot valve 62 acts is made smaller than the seat diameter of the main valve 63. As a result, it is considered that the pilot valve 62 can be opened only by the suction force of the plunger 51.

  In FIG. 2C, the pilot valve 62 and the main valve 63 are both opened.

  The plunger 51 in the valve chamber 81 is magnetized by the magnetic field generated by energization of the coil 2 of the electromagnetic shut-off valve body 1, thereby attracting the plunger 51 and lifting the valve body 61. The main valve 63 is opened.

  As a result, the fuel flow passage blocked by the main valve 63 is opened, and the gas fuel can be supplied at a large flow rate as indicated by the arrow in the enlarged view of FIG.

  This maintains the valve opening as long as the suction force of the plunger 51 exceeds the biasing force of the spring and the pressure applied.

  Note that the closing of the electromagnetic shut-off valve 1 is achieved by shutting off the energization of the coil 2.

  That is, since the attraction force disappears due to the disappearance of the magnetism of the plunger 51, the urging force of the return spring 4 causes the valve body 61 to operate in the valve closing direction, and both the pilot valve 62 and the main valve 63 are closed.

  In the present invention, since the valve body 61 is incorporated in the plunger 51 so as to be slidable in the axial direction, the force during operation of the valve body 61 is applied equally to the latching portion. Resistant to wear and excellent in durability.

  The configuration of the valve body is not limited to the present embodiment, but at least one of the main valve 63 and the pilot valve 62 formed at the distal end or the proximal end of the valve body 61 is the distal end and the base of the valve body 61. It is formed to project annularly from the surface around the end (FIGS. 1 to 4).

  Further, as shown in FIG. 3, a pilot valve seat 65 molded by an elastic body is provided at the tip of the plunger 51, and a valve body 61 formed of metal or resin is pressed against the pilot valve seat 65. It is good.

  As shown in FIG. 4, the structure of the pedestal 68 and the valve of the valve body 61 may be formed entirely of an elastic body, resin, or the like. It is good also as a structure which forms the main valve 63 and the pilot valve 62 which were formed with the elastic body at the front-end | tip and base end of the base 68 formed.

  1 solenoid shut-off valve body, 2 coil, 3 sleeve, 4 return spring, 51 plunger (main plunger), 52 sub-plunger, 53 valve body locking part, 54 housing part (accommodating part), 55 vent, 61 valve body, 62 pilot valve, 63 main valve, 64 main valve seat part, 65 pilot valve seat part, 66 annular convex part, 67 opening part, 68 mount, 71 inlet, 72 outlet, 73 valve, 81 valve Chamber, 82 bottom of valve chamber, 91 communication hole, 101 connecting pin

Claims (5)

A valve port is formed in a fuel passage for delivering gas fuel, and a valve port is formed at a communication portion between the inlet and the outlet formed in the block body, and the valve port communicates with the outlet. Is formed,
And, a plunger provided with a valve body at the tip is disposed in the valve chamber formed in the block body, facing the valve seat of the valve port,
Normally, the plunger that is attracted by the electromagnetic force of the electromagnet disposed around the valve chamber is closed by applying a biasing force in the valve chamber closing direction to close the valve port formed in the valve seat, A shutoff valve that pulls the plunger against the urging force in the proximal direction to open the valve port of the valve seat to open the inflow port and the discharge port,
The valve body is movable in the axial direction by a predetermined distance into a cylindrical body that opens at least a distal end surface projecting from the distal end of the plunger and forms an opening at a predetermined position at the proximal end portion of the peripheral wall. And it is loosely fitted in the tip direction so as not to be removable,
Further, the valve body forms a communication hole that communicates the distal end surface and the proximal end surface of the valve body, and a main valve body having a valve seat as a main valve seat at the bottom of the valve chamber is formed on the proximal end surface of the distal end surface. Are respectively formed with pilot valve bodies having a pilot valve seat on the tip surface of the plunger as a valve seat,
At the time of shutting off the valve body, the plunger is urged in the distal direction, the valve body is sandwiched between the valve seat and the pilot valve seat, and the main valve and the pilot valve are closed. Shut off the gas fuel,
When the plunger is attracted in the proximal direction against the biasing force by the electromagnetic force, the main valve element is attached to the valve seat due to the differential pressure between the inlet side and the outlet side. Sometimes, only the plunger is pulled, and the pilot valve seat on the front end surface of the plunger is opened away from the pilot valve body, and from the opening formed in the cylindrical body leading to the outflow port, the valve body The inflow port and the discharge port communicate with each other through a communication hole penetrating from the distal end surface to the proximal end surface,
An electromagnetic shut-off valve, wherein a pressure difference between the inlet and the outlet is eliminated, and the valve is lifted together with the plunger to open the main valve.   At least one or more holes for communicating the inlet and the outlet formed in the valve chamber through which gas fuel flows when the pilot valve is opened are provided in the peripheral wall of the accommodating portion of the plunger. The electromagnetic shut-off valve according to claim 1, wherein the electromagnetic shut-off valve is provided.   The at least one of the main valve or pilot valve formed at the front end or the base end of the valve body is formed to project annularly with respect to the front end or the base end. Electromagnetic shut-off valve.   The electromagnetic shut-off valve according to claim 1, 2 or 3, wherein the valve body is molded from a resin having appropriate elasticity.   The base of the said valve body is formed with the metal, The main valve and pilot valve which were formed in the front-end | tip and base end of the said valve body are formed with the elastic body, The Claim 1, 2, or 3 characterized by the above-mentioned. Electromagnetic shut-off valve.

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