JP6167010B2 - Pilot type control valve - Google Patents

Description

  The present invention relates to a pilot type control valve, and relates to a pilot type control valve used in a refrigeration cycle such as an air conditioner.

  Conventionally, as a pilot-type solenoid valve used in a refrigeration cycle such as an air conditioner, for example, a valve body provided with a main valve chamber having a valve port with a main valve seat, and an inlet joint connected to the main valve chamber of the valve body (Inlet) and an outlet joint (outlet) connected downstream from the main valve seat in the valve body, and a main valve body that is slidably inserted into the valve body and contacts and separates from the main valve seat, An electromagnetic actuator that moves the main valve element via a pilot valve element is known. (For example, Patent Document 1)

  In this type of pilot-type solenoid valve, a valve opening spring comprising a coil spring that urges the main valve body in the valve opening direction is compressed in the main valve chamber of the valve body, and the coil of the electromagnetic actuator is energized. The pilot valve body is moved (lifted) in the valve opening direction to open the pilot passage of the main valve body, and the fluid in the back pressure chamber above the main valve body is discharged to the outlet joint (outlet) at once through the pilot passage. The As a result, the back pressure chamber is decompressed and the main valve body is lifted and opened by the biasing force of the valve opening spring. The main valve body is lifted until its upper end surface comes into contact with the inner peripheral side portion (annular flat surface) of the lower end flange-like portion of the guide pipe of the electromagnetic actuator.

JP 2007-92826 A

  In the above-described conventional pilot type solenoid valve, although the main valve body can be driven with a small driving force, fluid flows from the inlet joint (inlet) connected to the main valve chamber to the outlet joint (outlet) when the valve is opened. At this time, the present inventors have confirmed that the valve opening spring disposed in the main valve chamber may be deformed by the fluid pressure of the fluid. Specifically, the valve opening spring is contracted by the fluid pressure, the lower end of the valve opening spring is lifted in the flow direction of the fluid, and the lower end is engaged between the main valve body and the main valve seat. It has been confirmed by the present inventors that the problem that the main valve body does not return to the closed state can occur.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a pilot-type control valve that can reliably prevent the main valve body from returning with a simple configuration. It is in.

  In order to solve the above-described problems, a pilot-type control valve according to the present invention has a main valve chamber defined therein, a first opening that opens to the main valve chamber is formed in a side portion, and the main valve chamber is formed in a bottom portion. A valve body having a second valve opening formed in the valve chamber, and a cylindrical valve seat member having a valve opening and a main valve seat opening in the main valve chamber in the second opening; and the main valve A main valve body disposed in the chamber so as to be movable up and down, an elevating drive unit for moving the main valve body up and down relative to the main valve seat, and a valve opening direction disposed around the valve seat member A pilot-type control valve provided with a valve-opening spring biased to the outer peripheral surface of the valve seat member, wherein a concave groove in which a lower end portion of the valve-opening spring is disposed is provided. It is a feature.

  In a preferred embodiment, the valve-opening spring is a conical spring.

  In a more preferred embodiment, the lower end portion of the valve opening spring is slidable in the concave groove.

  According to the pilot type control valve of the present invention, a concave groove is provided on the outer peripheral surface of the valve seat member, and the lower end portion of the valve opening spring is disposed in the concave groove, so that the outlet from the inlet when the valve is opened. When the fluid flows into the main valve chamber, the lower end portion of the valve opening spring disposed in the main valve chamber can be held in the concave groove provided on the outer peripheral surface of the valve seat member. The lower end of the valve opening spring is slidable in the concave groove, and the valve opening spring is deformed by the fluid pressure of the fluid flowing from the inlet to the outlet when the valve is opened. In addition, the behavior of the lower end portion of the valve opening spring can be restricted in the concave groove. Therefore, it is possible to reliably prevent the lower end portion of the valve opening spring from being caught between the main valve body and the main valve seat, and it is possible to reliably prevent the main valve body from returning.

It is a figure which shows one Embodiment of the pilot type control valve which concerns on this invention, Comprising: The longitudinal cross-sectional view which shows the valve closing state. The longitudinal cross-sectional view which shows the valve opening state of the pilot type control valve shown in FIG.

  Embodiments of a pilot type control valve according to the present invention will be described below with reference to the drawings, taking a pilot type solenoid valve using a solenoid as an actuator as an example. In the following, a mode in which a pilot type electromagnetic valve is mainly used as a pilot type control valve will be described. However, it is needless to say that a pilot type electric valve using a stepping motor or the like may be used as an actuator.

  FIG. 1 and FIG. 2 are diagrams showing an embodiment (pilot electromagnetic valve) of a pilot type control valve according to the present invention, and showing its closed state and open state.

  The pilot type solenoid valve 1 shown in the figure is used for a refrigeration cycle such as an air conditioner, for example, and is disposed in the main valve chamber 13 so as to be movable up and down, and a valve body 10 in which a main valve chamber 13 is defined. A main valve body 15 and an electromagnetic actuator (elevating drive unit) 20 for raising and lowering the main valve body 15 are provided.

  The valve body 10 has an inflow port (first opening) 11 that opens to the main valve chamber 13 at a side portion thereof, and an outflow port (second opening) 12 that opens to the main valve chamber 13 at the bottom portion. A cylindrical valve seat member 19 having a valve port 18 that opens to the main valve chamber 13 and a main valve seat 14 is integrally formed at the outlet 12. Then, a lateral inlet joint 11A is attached to the inlet 11 formed on the side, and a vertical outlet joint 12A communicating with the valve port 18 of the valve seat member 19 is attached to the outlet 12 formed on the bottom. ing.

  Here, on the outer peripheral surface of the tubular valve seat member 19, movement of a lower end corner portion 19 </ b> C as a lower spring receiving portion of a later-described valve opening spring 33 and movement of the lower end portion of the valve opening spring 33 at the time of valve opening is restricted. A concave groove 19A having an upper end corner portion 19B as a stopper and having a predetermined length L in the valve body ascending / descending direction is formed in an annular shape. An inclined surface 19D extending outward is connected to the lower end corner portion 19C of the recessed groove 19A, and is connected to the inner peripheral surface of the lower end of the substantially flat valve body 10 via the inclined surface 19D. Further, a diameter-reduced portion that is reduced in the upward direction is connected to the upper end corner portion 19B of the concave groove 19A, and the main valve seat 14 is formed at an end portion of the diameter-reduced portion. Note that the reduced diameter portion may be omitted, and the substantially cylindrical main valve seat 14 may be formed so as to be connected to the upper end corner portion 19B of the recessed groove 19A.

  The main valve body 15 is a short cylindrical body that is slidably fitted into the valve body 10 and has a cross-section that is fitted into the metal outer peripheral member 15B such as brass and caulked and fixed by a caulking portion 15C. The inner peripheral member 15A is made of synthetic resin such as convex Teflon (registered trademark), and the inner peripheral member 15A comes in contact with and separates from the main valve seat 14 of the valve seat member 19. Further, the main valve chamber 13 communicates with the back chamber 40 defined above the main valve body 15 so as to penetrate the central portion of the inner peripheral member 15A of the main valve body 15, and a pilot valve body 35 described later. A stepped pilot passage 37 that is opened and closed is formed.

  Further, around the valve seat member 19 of the valve body 10, a valve opening spring 33 made of a coil spring that urges the main valve body 15 in the valve opening direction is mounted. The valve-opening spring 33 is composed of a conical spring whose diameter is reduced downward in the valve body ascending / descending direction. The lower end corner portion 19 </ b> C of the groove 19 </ b> A formed in an annular shape on the outer peripheral surface of the member 19 is disposed in contact with the lower end corner portion 19 </ b> C.

  The electromagnetic actuator 20 is disposed above the main valve body 15, and mainly includes a coil 22 for energizing excitation, a housing 21 disposed so as to cover the outer periphery of the coil 22, and the upper inner peripheral side of the coil 22. And a bottomed cylindrical or columnar suction element 25 fixed to the housing 21 by a bolt 28, and a plunger 30 disposed opposite to the suction element 25. A holding hole 31 is provided at the tip of the plunger 30 on the main valve body 15 side, and a pilot valve body 35 made of a ball is accommodated in the holding hole 31 with a part of its lower surface exposed, and a caulking portion 31a. It is fixed by caulking. Further, a vertical hole 30a constituting a spring chamber and a horizontal hole 30b which is a pressure equalizing hole communicating with the vertical hole 30a are formed in the upper portion of the plunger 30, and the plunger 30 is urged in the vertical hole 30a in the valve closing direction (downward). A valve closing spring 26 comprising a coil spring is inserted and locked.

  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 welding or the like, 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 caulked and fixed by a caulking portion 16a provided on the upper inner circumferential step portion 16 of the valve body 10 with the ring-shaped member 17 interposed therebetween. In addition, the flat lower surface of the lower end flange portion 32b of the guide pipe 32 serves as a stopper surface that restricts movement of the main valve body 15 in the valve opening direction (upward).

  Between the plunger 30 and the main valve body 15 is a back pressure chamber 40, and when the main valve body 15 is closed (see FIG. 1), the fluid introduced into the main valve chamber 13 from the inlet joint 11A. Is introduced into the back pressure chamber 40 through the space between the outer peripheral surface of the outer peripheral member 15B of the main valve body 15 and the inner peripheral surface of the valve body 10 (between the sliding surfaces). It is also guided to a space S formed between the suction element 25 and the plunger 30 through the space between the outer peripheral surface and the inner peripheral surface of the guide pipe 32 (between the sliding surfaces), the horizontal hole 30b, and the vertical hole 30a.

  In the pilot type solenoid valve 1 having such a configuration, when the coil 22 is energized, the plunger 30 is attracted and attracted to the attractor 25 as shown in FIG. It is moved (lifted) in the valve opening direction (upward). As a result, the pilot passage 37 of the main valve body 15 is opened, and the fluid in the back pressure chamber 40 is discharged through the pilot passage 37 to the outlet joint 12A all at once. For this reason, the back pressure chamber 40 is decompressed, and the main valve body 15 is lifted and opened by the biasing force of the valve opening spring 33. At that time, the main valve body 15 is lifted until its upper end surface comes into contact with the stopper surface (the lower surface of the lower end hook-shaped portion 32b of the guide pipe 32), and the movement stops when the surface comes into contact with the stopper surface.

  When the valve port 18 is opened, the valve opening spring 33 disposed around the valve seat member 19 is a fluid that flows from the inlet joint 11A to the downstream outlet joint 12B when the valve is opened (for example, a fluid such as a highly viscous refrigerant). ) May be deformed by the fluid pressure. Specifically, the length L of the concave groove 19A of the valve seat member 19 in the valve body raising / lowering direction is designed to be longer than the wire diameter of the valve opening spring 33, and the valve opening spring 33 contracts due to the fluid pressure of the fluid. When (compressed), the lower end portion of the valve opening spring 33 slides in the fluid flow direction along the surface of the concave groove 19A of the valve seat member 19, and the protrusion of the concave groove 19A of the valve seat member 19 occurs. The movement stops when it comes into contact with the upper or lower corner 19B.

  As described above, in the pilot type electromagnetic valve 1 of the present embodiment, the lower end portion of the valve opening spring 33 disposed around the valve seat member 19 contacts the concave groove 19A provided on the outer peripheral surface of the valve seat member 19. They are tangentially arranged. When the fluid flows from the inlet joint 11A to the outlet joint 12A at the time of valve opening, the valve opening spring 33 is contracted and deformed by the fluid pressure of the fluid, and the lower end of the valve opening spring 33 is the surface of the groove 19A ( The movement stops along the outer peripheral surface of the valve seat member 19 and comes into contact with the upper end corner 19B of the groove 19A. That is, the upper end corner portion 19B of the recessed groove 19A functions as a stopper that restricts the behavior of the lower end portion of the valve opening spring 33, and the behavior of the lower end portion of the valve opening spring 33 is reliably restricted in the recessed groove 19A. Therefore, even when the valve opening spring 33 is deformed by the fluid pressure of the fluid flowing through the main valve chamber 13, the lower end portion of the valve opening spring 33 is caught between the main valve body 15 and the main valve seat 14. Is suppressed, and the problem that the main valve body 15 does not return to the closed state can be surely solved.

  When energization of the coil 22 is stopped, the attracting force to the plunger 30 by the attractor 25 disappears, and therefore the plunger 30 is moved in the valve closing direction (downward) by the urging force of the valve closing spring 26, and the pilot valve body. 35 contacts the main valve body 15 and closes the pilot passage 37. When the pilot valve body 35 comes into contact with the main valve body 15, the plunger 30 and the main valve body 15 are moved together in the valve closing direction (downward) against the biasing force of the valve opening spring 33. The inner peripheral member 15A of the valve body 15 comes into contact with the main valve seat 14 and the valve port 18 is closed.

  In the above-described embodiment, the form in which the upper end corner portion 19B of the recessed groove 19A formed on the outer peripheral surface of the valve seat member 19 functions as a stopper that regulates the behavior of the lower end portion of the valve opening spring 33 has been described. A protrusion or step portion is formed on the outer peripheral surface of the valve seat member 19 using a member different from the seat member 19, and the upper end corner portion of the concave groove is formed by the protrusion or step portion and the outer peripheral surface of the valve seat member 19. May be formed.

  In the above-described embodiment, the concave groove 19A having a predetermined length L is formed upward from the lower end of the outer peripheral surface of the tubular valve seat member 19, but, for example, in the middle of the outer peripheral surface of the valve seat member 19 A concave groove having a predetermined length may be formed from this portion.

  Further, the depth of the concave groove 19A formed in the outer peripheral surface of the valve seat member 19 (dimension in the direction perpendicular to the valve body lifting direction), that is, the direction perpendicular to the valve body lifting direction of the upper end corner portion 19B. The width at is preferably equal to or larger than the wire diameter of the valve opening spring 33 in order to reliably regulate the behavior of the lower end portion of the valve opening spring 33.

  In the above-described embodiment, the valve opening spring 33 has been described as a conical spring whose diameter decreases in the valve body lifting direction downward. However, the present invention is not particularly limited to this, and only the lower part thereof is contracted. Of course, it may be a cylindrical spring having a diameter, or a spring having a conical spring at its lower side and a cylindrical spring at its upper side.

  In the above-described embodiment, the lower end portion of the valve opening spring 33 has been described as being in contact with the concave groove 19A provided on the outer peripheral surface of the valve seat member 19, but the valve opening spring 33 is deformed. If the lower end portion of the valve opening spring 33 is pushed up, the lower end portion of the valve opening spring 33 is separated from the surface of the groove 19A. May be arranged. In this case, the width of the upper end corner 19B (the depth of the concave groove 19A) may be appropriately designed according to the wire diameter and inner diameter of the valve opening spring 33, the diameter of the bottom of the concave groove 19A, and the like.

  Furthermore, in the above-described embodiment, the valve seat member 19 has been described as being integrally formed with the valve main body 10, but the present invention is not particularly limited to this, and the valve seat member 19 is connected to the valve main body 10. Of course, it may be constituted by another member.

1 Pilot type solenoid valve (Pilot type control valve)
10 Valve body 11 Inlet (first opening)
12 Outlet (second opening)
11A Inlet joint 12A Outlet joint 13 Main valve chamber 14 Main valve seat 15 Main valve body 15A Inner peripheral member 15B Outer peripheral member 15C Caulking portion 16 Upper inner peripheral stepped portion 17 Ring-shaped member 18 Valve port 19 Valve seat member 19A Concave groove 19B Concave Upper end corner 19C of the groove Lower end corner 19D of the groove Inclined surface 20 Electromagnetic actuator (elevating drive unit)
26 Valve closing spring 30 Plunger 32 Guide pipe 32b Lower end flange 33 Valve opening spring 35 Pilot valve element 37 Pilot passage 40 Back pressure chamber

Claims (3)

A main valve chamber is defined inside, a first opening that opens to the main valve chamber is formed on a side portion, a second opening that opens to the main valve chamber is formed on a bottom portion, and the main opening is formed on the second opening. A valve body provided with a cylindrical valve seat member having a valve opening and a main valve seat that opens to the valve chamber; a main valve body that is arranged to be movable up and down in the main valve chamber; and A pilot-type control valve comprising an elevating drive unit that elevates and lowers with respect to the main valve seat, and a valve opening spring that is arranged around the valve seat member and biases the main valve body in the valve opening direction. ,
A pilot-type control valve, wherein a concave groove in which a lower end portion of the valve opening spring is disposed is provided on an outer peripheral surface of the valve seat member.   The pilot-type control valve according to claim 1, wherein the valve-opening spring is a conical spring. The pilot-type control valve according to claim 1 or 2, wherein a lower end portion of the valve-opening spring is slidable in the concave groove.

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