JP2010038321A - Flow rate control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow rate control valve which secures a stable operation, surely prevents dislocation of a pipe connected with the valve and damage on a bottom section of a valve body and maintains a smooth operation of a compressor even when it is used for a refrigerating cycle. <P>SOLUTION: The flow rate control valve 1 includes the valve body 2 internally having a valve chamber 5 and formed in a cylinder shape with a bottom, a projection section 2b arranged on the bottom of the valve body 2 and projecting toward an outflow tube 4 joined to the bottom of the valve body 2, and a valve hole 6 drilled on the projection section 2b and forming a flow passage for communication between the valve chamber 5 and the outflow tube 4, a valve 7 for opening and closing the valve hole 6, driving mechanisms 12-14 arranged inside the valve body 2 and moving the valve 7 in a direction for opening and closing the valve hole 6, and a coil mold 8 mounted on an outer periphery of the valve body 2 and generating an electromagnetic force for driving the driving mechanisms 12-14. The projection section 2b includes a large diameter section 2e brought into contact with an inner wall of the outflow tube 4, and a small diameter section 2d arranged between the large diameter section 2e and a bottom of the valve body 2 and forming a gap 16 between an inner wall of the outflow tube 4 and the projection section 2b. <P>COPYRIGHT: (C)2010,JPO&INPIT

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. A member for holding airtightness is made of stainless steel in a tube shape, and an electromagnetic valve integrated with a valve body is described. According to this electromagnetic valve, the number of brazing points is reduced from two to two in the past, Conventional centering of a guide pipe or the like is not necessary, and problems related to flux can be solved.

JP 2002-139169 A

  However, in the electromagnetic valve described in Patent Document 1, since the valve body is formed by press working and the bottom of the valve body is thin, the fixing force is weak when the outflow pipe is welded and fixed. There was a concern that it would come off or the bottom of the valve body would be damaged. Further, in the above-described electromagnetic valve, the mechanical strength of the bottom portion in which the valve hole is formed is insufficient, and there is a possibility that stable valve operation cannot be ensured. 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 provided at the bottom of the valve main body, which is formed in a bottomed cylindrical shape having a valve chamber inside, and the bottom of the valve main body. A projecting portion projecting toward the pipe to be joined, a valve hole formed in the projecting section and forming a fluid passage for communicating the valve chamber and the tube, and a valve body for opening and closing the valve hole, A drive mechanism provided inside the valve body for moving the valve body in a direction for opening and closing the valve hole; and a coil mold mounted on an outer periphery of the valve body for generating electromagnetic force for driving the drive mechanism. A large-diameter portion that abuts against the inner wall of the tube, and a gap formed between the large-diameter portion and the bottom of the valve body. And having a small diameter portion.

  According to the present invention, since the pipe can be firmly fixed by soldering from both the inside and outside using the gap secured by the small-diameter portion, the pipe is prevented from coming off and damaging the bottom of the valve body. can do. Further, when the valve main body and the pipe are assembled, the pipe can be positioned and temporarily fixed using the large diameter portion, so that the pipe mounting work can be facilitated.

  In the above flow control valve, the outer diameter of the large diameter portion can be set to be equal to or larger than the inner diameter of the pipe, and according to this, the valve body and the pipe can be more firmly fixed. It is possible to prevent the wax accumulated in the gap from leaking into the pipe.

  Moreover, the said flow control valve can be provided with the notch formed in the boundary part of the bottom face of the said valve main body, and a cylindrical side surface. According to this, the mechanical strength of the bottom portion can be increased by the notch, the mechanical strength of the bottom portion can be increased with a simple configuration, and stable operation of the valve can be ensured. In addition, the lubricating oil collected at the bottom is guided to the inclined surface when the notch 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 downward 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, notches (grooves) 2a having a V-shaped cross section are formed at a plurality of locations (in this embodiment, 5 locations). Is done. Further, by forming this notch 2a, an inclined surface 2c is formed on the bottom surface portion, so that the lubricating oil accumulated at the bottom of the valve body 2 is guided to the inclined surface 2c and is 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. The cross-sectional shape of the notch (groove portion) 2a can be various shapes such as a U-shape in addition to the 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 projecting portion 2b is formed at the same time when the valve body 2 is formed by press molding. The projecting portion 2b has a small-diameter portion 2d at a portion immediately below the bottom surface of the valve body 2, and a large-diameter portion 2e at the lower end portion. Have.

  Among these, the small-diameter portion 2d is for forming a gap 16 between the outer peripheral surface of the protruding portion 2b and the inner peripheral surface of the outflow pipe 4, and this gap 16 can be used as a brazing reservoir. . That is, by forming an opening at the upper end of the outflow pipe 4 and pouring wax into the gap 16, the outflow pipe 4 can be brazed and fixed to the outer surface of the valve body 2 from the outside (the brazed portion 17). In addition, the outflow pipe 4 and the protruding portion 2b can be brazed, and the outflow pipe 4 can be firmly fixed by brazing from both the outside and the inside.

  On the other hand, the large-diameter portion 2e functions as a positioning member for the outflow tube 4 or a temporary fixing member before welding by contacting the inner peripheral surface of the outflow tube 4 when the protruding portion 2b is inserted into the outflow tube 4. To do. The outer diameter of the large-diameter portion 2e is formed so as to be the same as or slightly larger than the inner diameter of the outflow pipe 4, and the protrusion 2b is formed into a size that can be press-fitted or lightly inserted into the outflow pipe 4.

  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, the protruding portion 2b protruding toward the outflow pipe 4 is formed at the bottom of the valve body 2, and the small diameter portion 2d for securing the gap 16 is formed as the protruding portion 2b. Therefore, the outflow pipe 4 can be firmly fixed by soldering from both the outer and inner sides, and the detachment of the outflow pipe 4 from the valve body 2 and the damage to the bottom of the valve body 2 can be avoided. . Further, when the protrusion 2b is inserted into the outflow pipe 4 when the valve body 2 and the outflow pipe 4 are assembled, the position of the outflow pipe 4 is fixed by the large diameter portion 2e, so that the positioning operation is facilitated. It becomes possible. Furthermore, since the outflow pipe 4 can be held by the large diameter portion 2e, the outflow pipe 4 can be temporarily fixed before welding, and the welding operation can be facilitated.

  Further, since the outer diameter of the large diameter portion 2e is the same as or slightly larger than the inner diameter of the outflow pipe 4, the valve body 2 and the outflow pipe 4 can be more firmly fixed. In addition, since the gap 16 can be reliably sealed by the large-diameter portion 2e, the wax accumulated in the gap 16 is prevented from leaking into the outflow pipe 4 when the valve body 2 and the outflow pipe 4 are assembled. It becomes possible.

  Furthermore, according to the solenoid valve 1, since the notch 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 can be increased. The stable operation of the valve can be ensured.

  Further, according to the electromagnetic valve 1, the lubricating oil collected at the bottom of the valve body 2 is guided by the inclined surface 2c 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.

  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

DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Valve body 2a Notch 2b Protruding part 2c Inclined surface 2d Small diameter part 2e Large diameter part 3 Inflow pipe 4 Outflow pipe 5 Valve chamber 6 Valve hole 7 Valve body 8 Coil mold body 10 Housing 11 Coil 12 Suction element 13 Valve closing Spring 14 Plunger 14a Spring chamber 14b Pressure equalizing hole 15 Holding hole 15a Caulking portion 16 Clearance (wax pool)
17 Brazing part 18 bolt

Claims (3)

A valve body formed into a bottomed cylindrical shape having a valve chamber therein;
A protrusion provided at the bottom of the valve body and protruding toward the pipe joined to the bottom of the valve body;
A valve hole that is perforated in the protruding portion and forms a fluid passage that communicates the valve chamber and the pipe;
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 the outer peripheral portion of the valve body and generates an electromagnetic force that drives the drive mechanism;
The protrusion includes a large-diameter portion that contacts the inner wall of the tube, and a small-diameter portion that is provided between the large-diameter portion and the bottom portion of the valve body and that forms a gap between the inner wall of the tube. A flow control valve characterized by comprising:   The flow control valve according to claim 1, wherein an outer diameter of the large diameter portion is equal to or larger than an inner diameter of the pipe.   The flow control valve according to claim 1, further comprising a notch formed at a boundary portion between a bottom surface of the valve body and a cylindrical side surface.

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