JP2001263527A - Pilot type solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a pilot type solenoid valve stabilizing the valve body with its suspended to a plunger in opening the valve. SOLUTION: This pilot type solenoid valve is so formed that the valve body is divided into two, a valve element guide and a valve element holder, and after the valve element guide is engaged with the bottom end of the plunger, the valve element holder is fixed to the valve element guide, and the valve body raised by being pulled by the plunger in opening the valve abuts on the bottom face of a chamber formed by the top end of the valve element guide in a connecting member, before the plunger is attracted by a stator, so as to restrict the raising of the plunger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot type solenoid valve in which a valve body is stabilized while being hung by a plunger when the valve is opened, and in particular, the valve body is connected to a valve body guide and a valve body holder. The present invention relates to a pilot-type solenoid valve which is divided into two parts so that parts can be easily processed.

[0002]

2. Description of the Related Art FIG. 3 is a longitudinal sectional view showing a conventional pilot-type solenoid valve disclosed in Japanese Patent Application Laid-Open No. 11-182726 when the valve is closed. FIG. It is a fragmentary vertical sectional view showing other forms. The conventional pilot-type solenoid valve includes an upper half solenoid 1 and a lower half valve 2. A coil 3 in which a copper wire is wound in a hollow cylindrical shape is formed in the solenoid unit 1, and a housing 4 is provided so as to surround the coil 3. At the upper end of the hollow portion of the solenoid portion 1, a stator 5 inserted almost to the center of the coil 3
Has been fixed. A plunger tube 7 whose upper end is welded and connected to the stator 5 and whose lower end is welded to the connecting member 6 is inserted into the hollow portion of the solenoid portion 1, and the plunger tube 7 is vertically movable within the plunger tube 7. Jar 8 is inserted. And, the plunger 8 includes the stator 5
And is always urged downward by a spring 9 provided between them.

On the other hand, the valve section 2 is constituted by a main body 13 in which an inflow port 11 and an outflow port 12 are formed. The main body 13 is opened upward, and the connecting member 6 fixed to the housing 4 is screwed into the main body 13, so that the solenoid portion 1 and the valve portion 2 are integrally formed. A main valve seat 15 is formed inside the main body 13 so as to protrude above a valve port 14 communicating the inflow port 11 and the outflow port 12, and a main valve chamber is provided on a primary side of the main valve seat 15. 16 are formed. In the main valve chamber 16, a valve body 18 connected to a lower end of the plunger 8 via a pin 17 is provided.
Are arranged. The valve body 18 is loosely fitted into the lower end of the plunger 8, and the pin 17 is inserted into the large insertion hole 19 penetrating in a radial direction through the overlapped portion thereof with a margin in the moving direction of the plunger 8. . Therefore, the valve body 18 is inserted into the insertion hole 1 with respect to the plunger 8.
It can be moved by an axial gap between the pin 9 and the pin 17.

[0004] A pilot valve chamber 21 is formed in the valve body 18 into which the lower end of the plunger 8 is inserted. The valve body 18 is provided with a small hole 22 for communicating the pilot valve chamber 21 and the main valve chamber 16 in the lateral direction, and further, a pilot hole 23 is formed in the axial portion thereof. A valve seat 24 protruding from the side is formed. On the other hand, at the lower end of the plunger 8 inserted into the pilot valve chamber 21 of the valve body 18, a pilot valve body 25 that comes into contact with or separates from a valve seat 24 formed on the valve body 18 is held. The lower end of the valve body 18 has a valve seat 15 formed on the body 13.
The main valve body 20 which comes into contact with and separates from the main valve body 20 is held.

The pilot type solenoid valve has a stepped portion 26 in which the axial dimension of the valve body 18 is shortened and the lower portion is expanded in the radial direction. The step 26 abuts against the lower end surface of the connecting member 6 when the valve is opened. At this time, the plunger 8 and the valve body 18 have a relationship in which a slight gap is formed without the plunger 8 coming into contact with the stator 5. , Its axial dimension is determined. This is because when the plunger 8 is attracted by the stator 5 and rises, the upward force applied to the plunger 8 by the magnetic attraction and the reaction force from the connecting member 6 due to the contact of the step 26 with the valve body The structure is such that the downward force applied to the element 18 is balanced.

Therefore, in the above-described conventional pilot-type solenoid valve, the valve body 18 is fixed even in a case where the valve body 18 is subjected to vibration during the valve-opening operation, for example, for use in an automobile, so that it does not swing because it is in a stable state. . Therefore, the valve body 18 and the plunger 8 do not come into contact with other members due to vibration, and wear due to collision or rubbing is avoided.

In a pilot type solenoid valve shown in FIG. 5 showing another embodiment, a valve body 33 is connected to a lower end of a plunger 31 via a pin 32. The valve body 33 is loosely fitted into the lower end of the plunger 31 and is inserted into a large insertion hole 34 penetrating the overlapped portion in the radial direction.
The pin 32 is inserted with a margin in the movement direction of the plunger 31. A pilot valve chamber 35 is formed in the insertion portion of the valve body 33 into which the lower end of the plunger 31 is inserted. The valve body 33 is provided with a small hole 36 for communicating the pilot valve chamber 35 and the main valve chamber 16, and a pilot hole 37 is provided in the axial center portion so as to project toward the pilot valve chamber 35. The provided valve seat 38 is formed. On the other hand, the valve body 33
At the lower end of the plunger 31 inserted into the pilot valve chamber 35, the valve seat 3 formed on the valve body 33 is provided.
The pilot valve body 39 which is in contact with and separates from the pilot valve body 8 is held. At the lower end of the valve body 33, a main valve body 40 that is in contact with and separates from the valve seat 15 formed on the body 13 is held.

The step portion 41 of the valve body 33 is formed with a tapered surface having the same angle as the contact surface of the connecting member 42 to be contacted. When the valve is opened, the stepped portion 41 comes into contact with the lower end face of the connecting member 42. At this time, the movable iron core 31 and the valve body 33 are in a relationship in which the plunger 31 does not hit the stator 5 and a slight gap is formed. Thus, its axial dimension is determined. In the valve body 33 having such a configuration,
Since the step portion 41 is stopped by hitting the tapered surface of the connecting member 42, the valve body 33 is stabilized when the valve body 33 comes into contact with the connecting member 42 when the valve is opened. Fixed, no longer swing,
Lateral deviation is also suppressed.

[0009]

However, the conventional pilot type solenoid valve has the following problems. (1) Pin 1 in which valve bodies 18 and 33 have backlash
Since they are connected to the lower ends of the plungers 8 and 31 via the holes 7 and 32, not only the cutting of the insertion holes 19 and 34 but also the processing of the pins are required, resulting in an increase in the cost of the parts. I have. Also, when assembling parts by inserting the pins into the insertion holes, the pins are difficult to drop out and assemble. (2) Since the outer diameter of the pilot valve body 25 is larger than the inner diameter of the rubber main valve body 20, scraps from the rubber main valve body 20 become waste and waste resources. .
Further, when the main valve body 20 and the pilot valve body 25 are molded products, two types of molds are required. (3) An O-ring (no reference numeral) is used to hermetically join the main body 13 and the connecting member 6, but since the O-ring is disposed above the screw portion, the O-ring is used for screwing. Chips generated by rubbing may get into the system.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the conventional pilot type solenoid valve, and has a valve body divided into a valve body guide and a valve body holder.
After the valve body guide is engaged with the lower end of the plunger, the valve body holder is fixed to the valve body guide, and the valve body that is pulled up by the plunger when the valve is opened and rises with respect to the stator. Before the plunger is attracted by suction, the upper end of the valve body guide contacts the bottom surface of the chamber formed in the connecting member to limit the rise of the plunger, thereby making it possible to easily process parts with a simple structure. It is intended to provide a simple pilot type solenoid valve.

That is, in the first invention, the outflow port 12
The main valve seat 1 is connected to the valve port 14 communicating between the
5, a solenoid unit 1 including a stator 5 fixed to the wound coil 3 shaft center and a plunger 8 movable in the axial direction, the main unit 13 and the solenoid unit After the pilot valve body 25 fixed to the lower end of the plunger 8 is opened, the main valve body 20 is held, and the valve body forming the valve seat 24 is lifted. In the pilot type solenoid valve constructed as described above, the lower part of the connecting member 6 has a chamber 6
a, the lower end of the plunger 8 facing the chamber 6a is bulged to provide a locking portion 8a.
Cylindrical valve body guide 51 that engages with the locking portion 8a
And a valve body holder 52 fixed to the lower end of the valve body guide 51, and the valve body 50 that is pulled up by the plunger 8 when the valve is opened and rises with respect to the stator 5. Before the plunger 8 is adsorbed, the upper end of the valve guide 51 abuts against the bottom surface 6b of the chamber 6a formed in the connecting member to limit the rise of the plunger 8 and the valve body 50. It is a type solenoid valve.

According to the first aspect of the present invention, the valve body 50 is divided into a valve body guide 51 and a valve body holder 52, and after the valve body guide 51 is engaged with the lower end of the plunger 8, the valve body is Since the valve element holder 52 is fixed to the guide 51, there is no need to form an insertion hole in a conventional pin or plunger, so that the processing of the parts is easy, the cost of the parts is low, and the parts are easily assembled. It can be carried out.

According to a second aspect of the present invention, there is provided the pilot solenoid valve according to the first aspect, wherein the inner diameter of the main valve body 20 and the outer diameter of the pilot valve body 25 are made equal.

According to the second aspect of the present invention, the main valve body 15 made of rubber is used.
Since the punched waste can be used for the pilot valve element 25, not only the parts cost is reduced, but also resources are saved.

According to a third aspect of the present invention, an O-ring 53 is used on a joint surface below a screw portion for joining the connecting member 6 and the main body 13.
It is a pilot-type solenoid valve described.

According to the third aspect of the present invention, cutting chips generated by rubbing when the connecting member 6 is screwed to the main body 13 are prevented from entering the system by the lower portion of the screw portion connecting the connecting member 6 and the main body 13. It can be blocked by the O-ring 53 provided on the joint surface.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a structure for fixing a pilot type solenoid valve according to the present invention.
FIG. 1 is a longitudinal sectional view of a pilot type solenoid valve according to the present invention when the valve is closed, and FIG.
It is an expanded longitudinal cross-sectional view which shows a part. The pilot solenoid valve includes an upper half solenoid 1 and a lower half valve 2. The solenoid portion 1 includes a coil 3, a housing 4, a stator 5, a plunger tube 7, and a plunger 8 provided with a locking portion 8a by bulging a lower end portion.
It is composed of Reference numeral 9 denotes a spring for constantly urging the plunger 8 downward.

The connecting member 6 is for hermetically connecting the solenoid portion 1 and a valve portion 2 to be described later. The connecting member 6 has a chamber 6a provided at a lower central portion thereof. The lower end of the plunger 8 having the pilot valve body 25 at the lower end faces the inside of 6a.

The valve section 2 comprises a main body 13 having an inflow port 11 and an outflow port 12, and a valve main body 50 comprising a valve body guide 51 and a valve body holder 52. A connection member 6 is screwed into an opening above the main body 13, and the main body 1 is connected via an O-ring 53.
3 and the connecting member 6 are airtightly integrated. Since the O-ring 53 is used for the joint surface below the screw portion, chips generated when the connecting member 6 is screwed to the main body 13 are prevented from entering the system. I have.

The inflow port 11 is provided inside the main body 13.
A main valve seat 15 is formed protruding above a valve port 14 that communicates with the outlet port 12, and a main valve chamber 16 is formed on the primary side of the main valve seat 15. The engaging portion 8a at the lower end of the plunger 8 faces the main valve chamber 16. Around the engaging portion 8a of the plunger, a cylindrical valve body guide 51 having a communication hole 22 for communicating the main valve chamber 16 with the pilot valve chamber is freely suspended.

In the valve body holder 52, a pilot hole 23 is bored in the axial center portion, and a valve seat 24 protruding from the pilot valve chamber 21 side is formed.
Main valve body 20 that comes into contact with and separates from main valve seat 15 formed in
Is held. And this valve body holder 52
The valve body guide 52 is fixed to the lower end portion by, for example, caulking. In the drawing, δ is a gap between the taper of the locking portion 8a and the taper portion of the valve body guide 51. Since the inner diameter of the main valve body 20 and the outer diameter of the pilot valve body 25 are equal to each other, the scraps of the rubber main valve body 15 can be used for the pilot valve body 25, so that component costs are reduced. Not only is it cheaper, but it also saves resources.

Next, the operation of the pilot type solenoid valve of the present invention will be described. FIG. 1 shows a state when the coil 3 is not energized, and the valve port 14 and the pilot hole 23 are closed. When the coil 3 is energized in this state, the plunger 8 is attracted toward the stator 5 against the spring 9 and rises by the gap δ between the taper of the locking portion 8 a and the tapered portion of the valve body guide 51. At this time, the pilot hole 23 communicates, the fluid in the chamber 6a formed in the pilot valve chamber 21 and the connecting member flows to the outflow port 12, and the pressure in the chamber 6a formed in the pilot valve chamber 21 and the connecting member suddenly increases. The valve body 50 receives an upward force (in a direction in which the valve port 14 opens), the valve body guide portion 51 of the valve body 50 is lifted by the locking portion 8a of the plunger, and the main valve body 50 is lifted. 20 is separated from the main valve seat 15 and the valve port 14 is opened. At this time, before the plunger 8 is attracted to the stator 5 by the valve body 50, the upper end of the valve body guide 51 abuts against the bottom surface 6b of the chamber 6a formed in the connecting member. 8 and the valve body 50 are restricted from rising. That is, in the present invention, similarly to the conventional product, the plunger 8 is connected to the stator 5.
A gap is formed without adsorbing to the valve body, the valve body 50 and the plunger 8 are prevented from hitting other members due to vibration, wear due to collision or rubbing is avoided, and lateral displacement is suppressed.

[0023]

According to the pilot-type solenoid valve structure of the present invention, the valve body and the plunger do not come into contact with other members due to vibration, wear due to collision or rubbing is avoided, and lateral displacement is suppressed. In addition to the effects of the product, there are the following effects. (1) The valve body 50 is connected to the valve body guide 51 and the valve body holder 52.
After the valve guide 51 is engaged with the lower end of the plunger 8, the valve holder 52 is fixed to the valve guide 51, so that it is inserted into a conventional pin or plunger. Since there is no need to process the holes, component processing is easy, component costs are low, and component assembly can be easily performed. (2) Since the inner diameter of the main valve body 20 is equal to the outer diameter of the pilot valve body 25, punched chips made of a rubber main valve body 15 hole can be utilized for the pilot valve body 25, and component costs are reduced. Not only is it cheaper, but it also saves resources. (3) Since the O-ring 53 for airtightly integrating the main body 13 and the connecting member 6 is used on a joint surface below a screw portion for screwing the main body 13 and the connecting member 6, the main body 13
The chips generated when the connecting member 6 is rubbed when the connecting member 6 is screwed do not enter the system.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pilot type solenoid valve according to the present invention.

FIG. 2 is an enlarged vertical sectional view showing a valve body 50 in FIG.

FIG. 3 is a longitudinal sectional view of a conventional pilot type solenoid valve.

FIG. 4 is an enlarged vertical sectional view showing a valve body 33 of another conventional pilot-type solenoid valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Solenoid part 2 Valve part 3 Coil 4 Housing 5 Stator 6 Connecting member 6a Chamber 7 Plunger tube 8 Plunger 8a Locking part 9 Spring 11 Inflow port 12 Outflow port 13 Main body 14 Valve port 15 Main valve seat 16 Main valve chamber Reference Signs List 20 main valve body 21 pilot valve chamber 22 communication hole 23 pilot hole 24 valve seat 25 pilot valve body 50 valve body 51 valve body guide 52 valve body holder 53 O-ring

Claims (3)

[Claims] 1. A body 13 having a main valve seat 15 formed in a valve port 14 communicating between an outflow port 12 and an inflow port 11.
And a solenoid unit 1 having a stator 5 fixed to the wound coil 3 shaft center and a plunger 8 movable in the axial direction, and a connecting member 6 for connecting the main body 13 and the solenoid unit. A pilot solenoid valve that holds the main valve body 20 and lifts a valve body forming the valve seat 24 after the pilot valve body 25 fixed to the lower end of the plunger 8 is opened. A chamber 6a is provided at a lower central portion of the connection member 6;
A lower end of the plunger 8 facing the chamber 6a is bulged to provide a locking portion 8a, while a cylindrical valve body guide 51 for engaging the valve body 50 with the locking portion 8a, The valve body 52 is fixed to the lower end of the body guide 51. The valve body 50, which is pulled up by the plunger 8 when the valve is opened and rises, is connected to the stator 5 by the plunger 8. A pilot solenoid valve wherein the upper end of the valve body guide 51 contacts the bottom surface 6b of the chamber 6a formed in the connecting member before suction, thereby restricting the plunger 8 and the valve body 50 from rising. 2. The pilot type solenoid valve according to claim 1, wherein the inner diameter of the main valve body 20 and the outer diameter of the pilot valve body 25 are made equal. 3. The pilot-type solenoid valve according to claim 1, wherein an O-ring is used for a joint surface below a screw portion for connecting the connecting member to the main body.