JP2007092859A - Pilot type solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pilot type solenoid valve free of the influence on the sliding motions of a plunger or a valve element by engaging a guide pipe with the valve element without increasing the number of component parts or the man-hours for processing and eliminating a distortion due to thermal deformation at the time of engagement. <P>SOLUTION: The solenoid valve is equipped with a valve body furnished with a main valve chamber having a main valve seat, the main valve element contacting with and separating from the main valve seat, an inlet joint brazed fast to the upstream of the main valve seat in the valve body, an outlet joint secured to the downstream of the main valve seat, a coil for feeding current for energization, a sucking piece installed on the inner peripheral side of the coil, the plunger arranged confronting the sucking piece, a plot valve element arranged moving in a single piece with the plunger, and the guide pipe having a minor diametric portion to admit inserting slidably of the plunger and a major diameter portion on which the main valve element is fitted slidably, wherein the major diameter portion of the guide pipe is inserted into a mounting opening formed in the valve body and is engaged fast to the valve body using a means exerting less thermal influence than brazing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pilot-type electromagnetic valve in which a pilot valve body is driven to open and close by an electromagnetic actuator, and a main valve body is opened and closed in response to the pilot valve body.

  A conventional example of this type of pilot type solenoid valve is shown in FIG. 3 (see also Patent Document 1 below). The illustrated pilot type solenoid valve 1 ′ is used in a refrigeration cycle such as an air conditioner, for example, and includes a valve body 10 provided with a valve chamber 13 having a main valve seat (valve port) 14, and the valve body 10. Inlet joint (inlet) 11 brazed and fixed (in-furnace brazing) upstream of main valve seat 14 and outlet joint brazed and fixed (in-furnace brazing) downstream of main valve seat 14 (Outlet) 12, a main valve body 15 that is slidably inserted into the valve main body 12 and contacts and separates from the main valve seat 14, and an electromagnetic actuator 20.

  The electromagnetic actuator 20 includes a coil 22 for energizing excitation, a housing 21 arranged to cover the outer periphery of the coil 22, and an upper inner circumference side of the coil 22 and fixed to the housing 21 by bolts 28. A bottomed cylindrical or columnar suction element 25 and a plunger 30 arranged to face the suction element 25 are provided. A holding hole 31 is provided at the tip of the plunger 30, and a pilot valve body 35 made of a ball is accommodated in the holding hole 31 with a part of the lower surface thereof exposed and fixed by caulking (caulking portion 31 a). ing. In the upper part of the plunger 30, a vertical hole (spring chamber) 30a and a horizontal hole (equal pressure equalization hole) 30b into which a valve closing spring 26 made of a coil spring is inserted and locked are formed.

  The plunger 30 is slidably fitted into a guide pipe 32 having an upper portion disposed between the coil 22 and the attractor 25. The upper end 32 a of the guide pipe 32 is fixed to the outer peripheral step portion of the suction element 25 by a method such as welding, and the outer peripheral portion of the lower end hook-shaped portion 32 b is placed on the upper inner peripheral step portion 16 of the valve body 10. . The lower end flange portion 32b of the guide pipe 32 is fixed by caulking with a caulking portion 16a provided in the upper inner circumferential step portion 16 of the valve body 10 with a metal ring-shaped member 17 interposed therebetween, and further, the caulking portion The part 16a, the ring-shaped member 17 and the guide pipe 32 are fixed by brazing (the brazed part 18).

  The main valve body 15 is a short cylindrical body composed of an outer peripheral member 15B made of brass and an inner peripheral member 15A made of Teflon having a convex cross section and being fitted and fixed (caulking portion 15c). A pilot passage 37 that is opened and closed by the pilot valve body 35 is formed so as to penetrate the portion. A pressure equalizing hole 19 is formed in the outer peripheral member 15B of the main valve body 15 so as to be in contact with the inner peripheral member 15A.

  The main valve chamber 13 is fitted with a valve opening spring 33 formed of a coil spring that urges the main valve body 15 in the valve opening direction.

  A back pressure chamber 40 is provided between the plunger 30 and the main valve body 15. When the main valve body 15 is closed, the fluid introduced from the inlet joint (inlet) 11 to the main valve chamber 13 is The gas is introduced into the back pressure chamber 40 through the space between the outer peripheral surface of the main valve body 15 and the inner peripheral surface of the valve body 10 (between the sliding surfaces). 32 is also led to a gap space S formed between the lower end surface of the suction element 25 and the plunger 30 through the space between the inner peripheral surface 32 (between the sliding surfaces), the horizontal hole 30b, and the vertical hole 30a.

  In addition to the above configuration, in the pilot type solenoid valve 1 ′ shown in the drawing, the lower surface inner peripheral side (flat surface) of the lower end hook-shaped portion 32 b of the guide pipe 32 moves in the valve opening direction (upward) of the main valve body 15. It is a stopper surface part that regulates.

  In the pilot type electromagnetic valve 1 ′ having such a configuration, when the coil 22 is energized, the plunger 30 is attracted and attracted to the attractor 25, and accordingly, the pilot valve body 35 is opened ( It is moved (lifted) upward. As a result, the pilot passage 37 is opened, and the fluid in the back pressure chamber 40 is discharged to the outlet joint (outlet) 12 through the pilot passage 37 all at once. For this reason, the back pressure chamber 40 is decompressed, the main valve body 15 is lifted by the urging force of the valve opening spring 33, and the valve is opened. In this case, the main valve body 15 is lifted until its upper end surface is brought into contact with the stopper surface portion (inner peripheral side portion of the lower end flange portion 32b of the guide pipe 32) 32b, and the stopper surface portion 32b (annular flat surface). ) To stop the surface contact.

Japanese Patent Laid-Open No. 10-103556

  However, in the conventional pilot type solenoid valve as described above, the guide pipe 32 and the valve body 10 are fastened and fixed by brazing, so that the vicinity of the brazing portion 18, that is, the sliding portion of the plunger 30. A portion near the lower end of the guide pipe 32 and a portion near the stepped portion 16 of the valve body 10 that is a sliding portion of the main valve body 15 are distorted by the heat effect of brazing, and the plunger 30 and the main valve body are distorted. Since 15 may not slide smoothly, additional processing (secondary processing) is required after brazing, resulting in an increase in cost.

  The present invention has been made in view of the above circumstances, and its purpose is to increase the number of parts, man-hours, etc. and increase the cost, and in the vicinity of the fastening portion between the guide pipe and the valve body, An object of the present invention is to provide a pilot-type solenoid valve that does not hinder the sliding of the plunger and the main valve body.

  In order to achieve the above object, a pilot-type solenoid valve according to the present invention basically includes a valve main body provided with a main valve chamber having a main valve seat, and a main valve body contacting and separating from the main valve seat. An inlet joint brazed and fixed upstream of the main valve seat in the valve body, an outlet joint fixed downstream of the main valve seat in the valve body, a coil for energization excitation, A suction element disposed on the inner peripheral side, a plunger disposed opposite to the suction element, a pilot valve body configured to move integrally with the plunger, and the plunger are slidably inserted. A guide pipe having a small-diameter portion and a large-diameter portion into which the main valve body is slidably fitted.

  And the large diameter part of the said guide pipe is inserted in the attachment opening part provided in the said valve main body, It is characterized by being fastened and fixed to the said valve main body by means with less heat influence than brazing.

  In a preferred embodiment, the guide pipe is fastened and fixed to the valve body by projection welding.

  In another preferred embodiment, a flange-like portion is provided at the lower end of the large-diameter portion of the guide pipe, the attachment opening of the valve body is formed in an inverted L shape, and the upper surface of the flange-like portion is the attachment opening. Is brought into contact with the lower surface of the portion.

  In another preferred embodiment, the terrace portion between the small diameter portion and the large diameter portion of the guide pipe is a stopper that restricts movement of the main valve body in the valve opening direction.

  The fastening and fixing portion between the guide pipe and the valve body is preferably sealed with a resin, an adhesive or the like to prevent crevice corrosion.

  In the pilot type solenoid valve according to the present invention, the guide pipe has a small diameter portion into which the plunger is slidably inserted and a large diameter portion into which the main valve body is slidably inserted. That is, in the conventional example, the main valve body was slidably fitted into the valve body, but in the present invention, both the plunger and the main valve body are slidably fitted into the guide pipe. The large diameter part of the guide pipe is inserted into the mounting opening provided in the valve body, and it is fastened and fixed to the valve body by means of projection welding, for example, with less heat influence than brazing. Pilot type with high quality and high reliability, which prevents the plunger and the main valve body from sliding in the vicinity of the fastening fixing part between the guide pipe and the valve body without increasing the cost or increasing the cost. A solenoid valve can be provided.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a pilot type electromagnetic valve according to the present invention, and FIG. 2 is an enlarged sectional view of a main part thereof.

  In the pilot type solenoid valve 1 of the illustrated embodiment, parts having the same configuration or the same functions as those of the conventional part of the pilot type solenoid valve 1 ′ shown in FIG. The description will be omitted, and the differences will be mainly described below.

  The pilot type electromagnetic valve 1 of the present embodiment is also used in a refrigeration cycle such as an air conditioner, for example, and differs from the above-described conventional example in the configuration of the valve body 10 and the guide pipe 32.

  That is, in the pilot type solenoid valve 1 of the present embodiment, the guide pipe 32 has a small diameter portion 32A into which the plunger is slidably inserted and a large diameter portion 32B into which the main valve body 15 is slidably inserted. A flange-like portion 32C is provided at the lower end of the large-diameter portion 32B.

  Further, the valve body 10 includes a cylindrical body 10A provided with a mounting opening 10a having an inverted L-shaped cross section and a bottom forming body 10B having a convex cross section, and from the side of the cylindrical body 10A, that is, from the main valve seat 14. The inlet joint 11 is fixed to the upstream side by brazing in the furnace, and the outlet joint 12 is fixed to the bottom of the bottom forming body 10B, that is, the downstream side of the main valve seat 14 by an appropriate means such as press fitting.

  The large-diameter portion 32B of the guide pipe 32 is inserted into the mounting opening 10a of the cylindrical body 10A from below, and is fastened and fixed by means having little thermal influence during welding, for example, projection welding. In this case, the upper surface of the bowl-shaped portion 32C is brought into contact with the lower surface of the mounting opening 10a having an inverted L-shaped cross section, and between the upper surface of the mounting opening 10a and the outer peripheral surface of the large-diameter portion 32B of the guide pipe 32 (corner). The entire circumference of the portion is fastened and fixed by means of less heat influence than brazing such as projection welding. The cylindrical body 10A and the bottom forming body 10B are fastened and fixed together by an appropriate means after the guide pipe 32 is fastened and fixed.

  Further, the fastening and fixing portion 60 between the large diameter portion 32B of the guide pipe 32 and the cylindrical body 10A of the valve body 10 is sealed with a resin, an adhesive or the like to prevent crevice corrosion after fastening and fixing.

  Further, a terrace portion 32D between the small diameter portion 32A and the large diameter portion 32B of the guide pipe 32 serves as a stopper that restricts movement of the main valve body in the valve opening direction.

  In addition, a concave portion 15b serving as a back pressure chamber 40 is formed in the upper portion of the main valve body 15, and an upper end surface portion 15a on the outer peripheral side of the concave portion 15b comes into contact with the stopper (step terrace portion) 32D.

  Thus, in this embodiment, the guide pipe 32 has the small diameter part 32A in which the plunger 30 is slidably inserted, and the large diameter part 32B in which the main valve body 15 is slidably inserted. That is, in the conventional example, the main valve body is slidably inserted into the valve body, but in the embodiment of the present invention, both the plunger 30 and the main valve body 15 are slidably inserted into the guide pipe 32. Furthermore, since the large diameter portion 32B of the guide pipe 32 is inserted into the mounting opening 10a provided in the valve body 10, and is fastened and fixed to the valve body 10 by projection welding, which has less thermal influence than brazing. The sliding of the plunger 30 and the main valve body 15 is not hindered in the vicinity of the fastening and fixing portion 60 between the guide pipe 32 and the valve main body 10 without increasing the number of parts, man-hours, etc. or increasing the cost. Can be.

The longitudinal cross-sectional view which shows one Embodiment of the pilot type solenoid valve which concerns on this invention. The principal part enlarged view of the pilot type solenoid valve shown by FIG. The longitudinal cross-sectional view which shows the prior art example of a pilot type solenoid valve.

Explanation of symbols

1 Pilot Type Solenoid Valve 10 Valve Body 10a Mounting Opening 10A Cylindrical Body 10B Bottom Forming Body 11 Inlet Joint (Inlet)
12 Outlet joint (outlet)
13 main valve chamber 14 main valve seat 15 main valve body 20 electromagnetic actuator 25 attractor 26 valve closing spring 30 plunger 32 guide pipe 32A small diameter portion 32B large diameter portion 32C hook-shaped portion 32D stopper 60 fastening fixing portion

Claims (5)

  A valve main body provided with a main valve chamber having a main valve seat, a main valve body contacting and separating from the main valve seat, an inlet joint brazed and fixed upstream of the main valve seat in the valve main body, An outlet joint fixed downstream of the main valve seat in the valve body, a coil for energization excitation, an attractor disposed on the inner peripheral side of the coil, and a plunger disposed to face the attractor; A pilot valve body configured to move integrally with the plunger, a small diameter portion into which the plunger is slidably inserted, and a guide pipe having a large diameter portion into which the main valve body is slidably inserted The pilot pipe is inserted into a mounting opening provided in the valve body, and is fastened and fixed to the valve body by a joining means with little heat influence. Type solenoid valve.   The pilot-type solenoid valve according to claim 1, wherein the guide pipe is fastened and fixed to the valve body by projection welding.   A flange-shaped portion is provided at the lower end of the large-diameter portion of the guide pipe, the mounting opening of the valve body is formed in an inverted L shape in cross section, and the upper surface of the flange-shaped portion is in contact with the lower surface of the mounting opening The pilot type solenoid valve according to claim 1 or 2, wherein the pilot type solenoid valve is tightened.   The terrace part between the small diameter part and the large diameter part of the guide pipe is a stopper for restricting movement of the main valve body in the valve opening direction. Pilot type solenoid valve as described in the paragraph. 5. The pilot according to claim 1, wherein a fastening and fixing portion between the guide pipe and the valve main body is sealed with a resin, an adhesive, or the like so as to prevent crevice corrosion. Type solenoid valve.

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