JP5238389B2 - Flow control valve - Google Patents

Description

  The present invention relates to a flow rate control valve that is used for controlling the refrigerant flow rate of a refrigeration cycle and that opens and closes a valve body by electromagnetic force.

  As an example of the flow control valve, conventionally used solenoid valves include, for example, a brass valve body 32 having a valve chamber 35 having a valve seat 36 therein, and a valve body 32 as shown in FIG. A copper inflow pipe 33 connected to the valve chamber 35, a copper outflow pipe 34 connected to the downstream side of the valve seat 36 of the valve body 32, and an upper part of the valve body 32 are attached to the valve seat 36. An electromagnetic actuator 38 and the like for bringing the ball-shaped valve element 37 into contact and separation are provided.

  The electromagnetic actuator 38 includes a coil 41 for energization excitation, an attractor 42 disposed on the upper inner peripheral side of the coil 41, an outer peripheral step portion of the attractor 42, and an upper inner peripheral step portion of the valve body 32. The guide pipe 46 made of stainless steel whose end is joined by welding or the like, and the guide pipe 46 are arranged below the suction element 42 inside the guide pipe 46, and at a predetermined interval with respect to the suction element 42 when the coil 41 is not energized. A plunger 44 that is opened and opposed is provided, and a housing 40 that covers the outer periphery of the coil 41.

  Further, a holding hole 45 is formed in the lower end portion of the plunger 44, and the valve body 37 is accommodated in the holding hole 45 with a part of its lower surface exposed and fixed by caulking (caulking portion 45a). ing. In the upper part of the plunger 44, a spring chamber 44a into which a valve closing spring 43 made of a coil spring is inserted and locked is extended in the vertical direction, and a pressure equalizing hole 44b is extended in the horizontal direction.

  When the coil 41 is energized, the solenoid valve 31 having the above configuration attracts and attracts the plunger 44 to the attractor 42, and accordingly, the valve element 37 is opened away from the valve seat 36. On the other hand, when the energization of the coil 41 is stopped, the plunger 44 and the valve element 37 are pushed back by the urging force of the valve closing spring 43 to close the valve.

  When the electromagnetic valve 31 is assembled, it is necessary to weld the inflow pipe 33, the outflow pipe 34, and the guide pipe 46 to the valve body 32. When the guide pipe 46 is welded to the valve body 32, the centering is performed. Need to do. Further, when welding the copper inflow pipe 33 and the outflow pipe 34 to the brass valve body 32, brazing using a flux is performed. For this reason, there are problems such as the possibility of adversely affecting the natural environment by using a large amount of flux and an increase in manufacturing cost due to an increase in the amount of work such as flux removal.

Therefore, in Patent Document 1, in a solenoid valve in which a valve body is provided inside a plunger and a spring is contracted between the upper end surface of the plunger and the lower end surface of the attracting element, the fluid passage of the solenoid valve is provided. An electromagnetic valve is described in which a member to be kept airtight is made of stainless steel in a tube shape and integrated with a valve body . According to this solenoid valve, the number of brazing points is reduced from three to two, and the centering of a conventional guide pipe or the like is not necessary, and the problem with flux can be solved.

  However, in the electromagnetic valve described in Patent Document 1, since the valve body formed in a tube shape is formed by pressing, the mechanical strength of the bottom portion in which the valve hole is drilled is insufficient, and the stable valve There was a possibility that the operation of could not be secured. In addition to this, since the bottom part where the valve hole is drilled is formed thin, the fixing force is weak when the pipe is welded and fixed, and the pipe may come off or the bottom part of the valve body may be damaged. . Furthermore, since the periphery of the valve hole at the bottom of the valve body is recessed, when this solenoid valve is used in a refrigeration cycle, etc., the lubricating oil for the compressor accumulates at the bottom of the valve body, and there is an area that receives the differential pressure. Increasing the load increases the load that presses the valve body downward, which hinders the opening and closing operation of the valve body, and also causes a problem that hinders the smooth operation of the compressor.

  Therefore, the present invention has been made in view of the problems in the conventional electromagnetic valve described above, and ensures a stable operation of the valve with a simple configuration, and ensures that the pipe is detached and the bottom of the valve body is damaged. It is an object of the present invention to provide a flow rate control valve capable of preventing the compressor and maintaining the smooth operation of the compressor even when used in a refrigeration cycle or the like.

In order to achieve the above object, the present invention is a flow control valve, which is formed in a bottomed cylindrical shape having a valve chamber therein, and has a valve body having a valve hole communicating with the valve chamber formed in the bottom portion. A pipe fixed to the bottom surface of the valve main body to form a fluid passage communicating with the valve chamber through the valve hole, a valve body for opening and closing the valve hole, and provided inside the valve main body. The valve body includes: a drive mechanism that moves the valve body in a direction to open and close the valve hole; and a coil mold body that is mounted on an outer peripheral portion of the valve body and generates an electromagnetic force that drives the drive mechanism. From the periphery of the valve hole toward the inside of the tube, the portion directly below the valve body has a small diameter and the lower end portion protrudes to have a large diameter, and a gap is formed between the inner peripheral surface of the tube Provided with a cylindrical projecting portion, an outer peripheral surface of one end of the tube and a bottom surface of the valve body While being brazed, characterized in that it is assigned an inner peripheral surface and the gallery of the one end portion of the outer peripheral surface and the tube of the projecting portion by brazing accumulated in the gap.

According to the present invention, not only the tube is brazed and fixed from the outside to the bottom surface of the valve body, but also the inner peripheral surface of one end of the tube and the outer peripheral surface of the protruding portion are brazed using the gap. Therefore, it is possible to firmly fix the tube from both the inside and outside by brazing, and avoid the disconnection of the tube and damage to the bottom of the valve body .

In the above flow control valve, before the groove is provided in the boundary portion between the bottom surface and the cylindrical side surface of Kiben body, to form an inclined surface for guiding the lubricating oil accumulated in the bottom portion of the valve body to the valve hole Rukoto Can do. As a result, the mechanical strength of the bottom of the valve body can be increased with a simple configuration, and a stable operation of the valve can be ensured. In addition, the lubricating oil collected at the bottom of the valve body is guided by the inclined surface when the groove is formed and is easily discharged from the valve hole, and the amount of lubricating oil collected at the bottom is reduced. Therefore, it can avoid that the load which presses a valve body below increases and the opening / closing operation | movement of a valve body is prevented. Thereby, even when this flow control valve is used in a refrigeration cycle or the like, the smooth operation of the compressor can be maintained.

  As described above, according to the present invention, with a simple configuration, the stable operation of the valve is ensured, the pipe is detached, the valve body bottom portion is reliably prevented, and even when used in a refrigeration cycle, A flow control valve capable of maintaining the smooth operation of the compressor can be provided.

  Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a solenoid valve 1 as an embodiment of a flow control valve according to the present invention. The electromagnetic valve 1 is formed in a bottomed cylindrical shape having a valve chamber 5 inside, a valve body 2 having a valve hole 6 formed in the bottom, a spherical valve body 7 for opening and closing the valve hole 6, a valve A suction element 12, a valve closing spring 13 and a plunger 14, which are provided inside the main body 2 and move the valve body 7 in a direction to open and close the valve hole 6, and are mounted on the outer peripheral portion of the valve main body 2, And a coil mold body 8 for generating an electromagnetic force for driving the drive mechanism.

  The valve main body 2 is formed in a bottomed cylindrical shape as a whole, an upper portion thereof is opened, and an upper end portion thereof is fixed to a step portion of the suction element 12. A plunger 14 is provided inside the valve body 2 so as to be movable in the vertical direction. The valve hole 6 drilled in the bottom of the valve body 2 is caulked and fixed to the holding hole 15 at the lower end of the plunger 14 (caulking part). 15a) The valve body 7 is opened and closed.

  A copper inflow pipe 3 and an outflow pipe 4 are fixed to the lower part of the valve body 2 by brazing, and the fluid passages in the inflow pipe 3 and the outflow pipe 4 communicate with the valve chamber 5 in the valve body 2. To do.

In order to reinforce the mechanical strength of the bottom surface at the boundary between the bottom surface of the valve body 2 and the cylindrical side surface , groove portions 2a having a V-shaped cross section are formed at a plurality of locations (in this embodiment, 5 locations). . Further, since the inclined surface 2c is formed on the bottom surface by forming the groove 2a, the lubricating oil accumulated on the bottom of the valve body 2 is easily guided to the inclined surface 2c and easily discharged from the valve hole 6. Thus, the amount of lubricating oil accumulated at the bottom of the valve body 2 can be reduced. In addition , the cross-sectional shape of the groove part 2a can be made into various shapes, such as U shape besides V shape.

  As clearly shown in FIG. 1 (c), a protruding portion 2 b protrudes downward from the periphery of the valve hole 6 of the valve body 2. The protruding portion 2b is formed such that a portion immediately below the bottom surface of the valve body 2 has a small diameter and a lower end portion has a large diameter, and a gap 16 is formed between the outer peripheral surface of the protruding portion 2b and the inner peripheral surface of the outflow pipe 4. Is formed. Therefore, not only the outflow pipe 4 is brazed and fixed to the outer surface of the valve body 2 from the outside (brazing portion 17), but an opening is formed at the upper end of the outflow pipe 4 and the gap 16 is used as a brazing pool. By brazing between the outflow pipe 4 and the protrusion 2b, the outflow pipe 4 can be firmly fixed by brazing from both the inside and outside.

  The suction element 12 constituting the drive mechanism is fixed to the upper part of the valve body 2, and the housing 10 is fixed to the upper part of the suction element 12 by bolts 18. A valve closing spring 13 is interposed between the suction element 12 and the plunger 14 to urge the plunger 14 downward. A spring chamber 14a into which the valve closing spring 13 is inserted and locked is extended in the vertical direction at the upper portion of the plunger 14, and a pressure equalizing hole 14b is extended in the horizontal direction.

  The coil mold body 8 includes a coil 11 that is attached to the outer peripheral portion of the valve body 2 and generates an electromagnetic force that drives the drive mechanism, and a housing 10 that covers the outer periphery of the coil 11.

  When the coil 11 is energized, the solenoid valve 1 having the above configuration attracts and attracts the plunger 14 to the attractor 12, and the ball-shaped valve element 7 opens the valve hole 6 and opens the valve. As a result, fluid flows from the inflow pipe 3 to the outflow pipe 4 via the valve chamber 5. On the other hand, when the energization to the coil 11 is stopped, the urging force of the valve closing spring 13 pushes the plunger 14 and the valve body 7 downward to close the valve hole 6 and close the valve.

As described above, according to the electromagnetic valve 1, since the groove 2a is formed at the boundary between the bottom surface of the valve body 2 where the valve hole 6 is formed and the cylindrical side surface, the mechanical strength of the bottom of the valve body 2 is increased. And stable operation of the valve can be ensured.

Further, according to the solenoid valve 1, the lubricating oil collected at the bottom of the valve body 2 is guided by the inclined surface 2 c and is easily discharged from the valve hole 6, and the amount of lubricating oil collected at the bottom of the valve body 2 is reduced. Therefore, even when the electromagnetic valve 1 is used in a refrigeration cycle or the like, the smooth operation of the compressor can be maintained.

  Furthermore, since the protrusion 2b protrudes inside the outflow pipe 4 fixed to the valve body 2, and the outflow pipe 4 is firmly fixed by soldering from both the outer side and the inner side, the outflow pipe 4 from the valve main body 2 is fixed. This prevents the bottom of the valve body 2 from being damaged.

  In the above embodiment, the case where the present invention is applied to an electromagnetic valve having a plunger and an attractor as an actuator has been described. However, the present invention can also be applied to an electric valve using an electric motor as an actuator. it can.

It is a figure which shows one Embodiment of the flow control valve concerning this invention, Comprising: (a) is front sectional drawing, (b) is a bottom view, (c) is the partially expanded view of (a). It is front sectional drawing which shows an example of the conventional solenoid valve.

Explanation of symbols

1 solenoid valve 2 valve main body 2a groove 2b protruding portion 2c inclined surface 3 inlet tube 4 outlet pipe 5 valve chamber 6 valve hole 7 valve 8 coil mold body 10 housing 11 coil 12 suction element 13 the valve closing spring 14 the plunger 14a spring chamber 14b Pressure equalizing hole 15 Holding hole 15a Caulking portion 16 Clearance (wax pool)
17 Brazing part 18 bolt

Claims (2)

A valve body formed in a bottomed cylindrical shape having a valve chamber inside, and having a valve hole communicating with the valve chamber in the bottom portion;
A tube fixed to the bottom surface of the valve body to form a fluid passage communicating with the valve chamber via the valve hole;
A valve body for opening and closing the valve hole;
A drive mechanism provided inside the valve body and moving the valve body in a direction to open and close the valve hole;
A coil mold body that is mounted on an outer peripheral portion of the valve body and generates an electromagnetic force that drives the drive mechanism;
From the periphery of the valve hole of the valve body toward the inside of the pipe, the portion immediately below the valve body protrudes so as to have a small diameter and the lower end portion has a large diameter, and between the inner peripheral surface of the pipe. Provide a cylindrical protrusion that forms a gap,
The outer peripheral surface of one end of the tube and the bottom surface of the valve main body are brazed, and the outer peripheral surface of the protruding portion and the inner peripheral surface of one end of the tube are caused by the brazing accumulated in the gap. A flow control valve characterized by being brazed.   The groove part is provided in the boundary part of the bottom face of the said valve main body, and a cylindrical side surface, The inclined surface which guides the lubricant which accumulates in the bottom part of the said valve main body to the said valve hole was formed. Flow control valve.

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