CN215059918U

CN215059918U - Electromagnetic valve

Info

Publication number: CN215059918U
Application number: CN202121439822.1U
Authority: CN
Inventors: 李瑞锋; 黄路路
Original assignee: Bosch Rexroth Changzhou Co Ltd
Current assignee: Bosch Rexroth Changzhou Co Ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2021-12-07
Anticipated expiration: 2031-06-25

Abstract

The application discloses solenoid valve includes: a valve body; a valve spool axially movable in the valve body; the electromagnet and the return spring act on the valve core along the axial opposite direction, and the electromagnet comprises an electromagnet core pipe arranged at the axial end part of the valve body; the valve is characterized in that a jack opened on the end face, a threaded hole positioned on the front side of the jack and an annular flange positioned on the front side of the threaded hole are formed in the axial end part of the valve body; the electromagnet core pipe comprises a flange and a threaded section positioned on the axial front side of the flange, an annular groove is formed between the flange and the threaded section, and a tail end convex ring with the outer diameter reduced relative to the threaded section is formed on the axial front side of the threaded section; the thread section is meshed in the threaded hole, the tail end convex ring pushes against the annular flange, the flange is completely or partially accommodated in the jack, and the annular groove is internally provided with the O-shaped ring.

Description

Electromagnetic valve

Technical Field

The present application relates to a solenoid valve for use in a hydraulic system.

Background

In a hydraulic system, various solenoid valves are used to control the flow of working fluid. Solenoid valves typically include an electromagnet and a return spring for controlling the motion of the valve spool. A partial structure of a solenoid valve is shown in fig. 1, revealing one side control end of the solenoid valve. The solenoid valve comprises an electromagnet which is provided with an electromagnet core tube 1 arranged on one side of a valve body 2 and a push rod 3 which can axially move in the electromagnet core tube 1 relative to the electromagnet core tube 1. The tail end of the electromagnet core tube 1 is provided with a thread section and a flange 4 with the diameter larger than the thread section, the thread section is meshed in the valve body 2, and the flange 4 pushes against a sinking groove formed on the end face of the valve body 2 for limiting. This achieves the mounting of the electromagnet on the valve body 2. The O-ring between the threaded section and the flange 4 provides a seal between the electromagnet and the valve body 2.

The electromagnetic valve shown in fig. 1 has a structure that a flange is matched with a sink groove, so that the processing technology is complex and the cost is high.

Therefore, it is desirable to construct a new type of solenoid valve that can at least solve the problems of complex process and high cost caused by the flange and sink fitting.

SUMMERY OF THE UTILITY MODEL

The present application aims to provide a simple and reliable solenoid valve.

According to an aspect of the present application, there is provided a solenoid valve including: a valve body; a valve spool axially movable in the valve body; the electromagnet and the return spring act on the valve core along the axial opposite direction, and the electromagnet comprises an electromagnet core pipe arranged at the axial end part of the valve body; the valve is characterized in that a jack opened on the end face, a threaded hole positioned on the front side of the jack and an annular flange positioned on the front side of the threaded hole are formed in the axial end part of the valve body; the electromagnetic iron core pipe comprises a flange and a threaded section positioned on the axial front side of the flange, an annular groove is formed between the flange and the threaded section, and a tail end convex ring with the outer diameter reduced relative to the threaded section is formed on the axial front side of the threaded section; the thread section is meshed in the threaded hole, the tail end convex ring pushes against the annular flange, the flange is completely or partially accommodated in the jack, and an O-shaped ring is arranged in the annular groove.

Optionally, a retainer ring is also disposed in the annular groove axially rearward of the O-ring to prevent the O-ring from collapsing when subjected to high hydraulic pressure.

Optionally, the flange has an outer diameter greater than or equal to an outer diameter of the threaded section.

Optionally, the end collar has a front end surface, the annular flange has a stop surface facing the opening side of the insertion hole, and the front end surface pushes against the stop surface.

Optionally, the receptacle is a smooth bore, and the ring groove and the receptacle together define a seal ring chamber.

Optionally, the axial length of the receptacle is equal to the sum of the axial lengths of the flange and the ring groove.

Optionally, the axial length of the threaded bore is equal to the sum of the axial lengths of the threaded section and the terminal collar.

Optionally, the axial length of the internal thread of the threaded bore is greater than the axial length of the external thread of the threaded section.

Optionally, the electromagnet is arranged at one axial end of the valve body, and the return spring is arranged at the other axial end of the valve body.

Optionally, the electromagnet and the corresponding return spring are respectively arranged at each axial end of the valve body.

According to the electromagnetic valve, the flange of the electromagnetic core tube is installed in the valve body, a sink groove matched with the flange does not need to be formed in the end face of the valve body, the valve body is simplified in processing, and cost can be reduced. Meanwhile, due to the reduction of the diameter of the electromagnetic iron core pipe flange, the processing cost and the material cost can be reduced.

Drawings

Embodiments of the present application will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a partial cross-sectional view of a solenoid valve according to the prior art, showing an electromagnet mounting structure according to the prior art;

FIG. 2 is a partial cross-sectional view of a solenoid valve according to an exemplary embodiment of the present application, illustrating an electromagnet mounting structure according to the present application;

FIG. 3 is a partial cross-sectional view of the solenoid core tube of the solenoid valve of FIG. 2;

FIG. 4 is a partial cross-sectional view of a valve body of the solenoid valve of FIG. 2;

fig. 5 is a partial sectional view of a solenoid valve according to a modified embodiment of the present application, illustrating another electromagnet mounting structure according to the present application.

Detailed Description

The present application relates generally to a solenoid valve, which may be a two-position or three-position directional valve, for controlling the direction of flow of a working fluid in a hydraulic system.

A solenoid valve according to an exemplary embodiment of the present application, a part of which is shown in fig. 2, includes an electromagnet having an electromagnet core tube 1, the electromagnet core tube 1 being mounted to one side of a valve body 2. The electromagnet also has a push rod 3 axially movable in the electromagnet core tube 1 with respect to the electromagnet core tube 1. Inside the valve body 2 is disposed an axially slidable valve element (not shown) against which the end of the push rod 3 is directly or indirectly urged axially. On the other side of the valve body 2, a return spring (not shown) corresponding to this electromagnet is provided. The return spring urges the spool in an axial direction opposite to the thrust of the push rod 3. When the electromagnet is electrified, the push rod 3 pushes the valve core to realize the corresponding valve position. After the electromagnet is powered off, the valve core is pushed back to the original position by the reset spring.

Referring to fig. 3, a portion of the electromagnet core tube 1 is depicted. A push rod cavity 7 is formed inside the electromagnet core tube 1 and used for accommodating the push rod 3 and guiding the push rod 3. On the axially front side (left side in fig. 2) of the plunger chamber 7, a cavity 8 having an enlarged diameter with respect to the plunger chamber 7 is formed in the solenoid core tube 1, and on the axially front side of the cavity 8, a groove 9 having an enlarged diameter with respect to the cavity 8 is formed.

On the outer periphery of the electromagnet core tube 1, a flange 4 and a threaded section 10 located on the axially forward side of the flange 4 are formed. An annular groove 11 is formed between the flange 4 and the threaded section 10. On the front side of the thread segment 10, a terminal collar 12 having a reduced outer diameter with respect to the thread segment 10 is formed. The collar 12 constitutes an end portion of the electromagnet core tube 1, and a front end face 12a of the collar 12 is a front end face of the electromagnet core tube 1. The collar 12 is located radially outside the front part of the groove 9. The threaded section 10 is located radially outwardly of the front portion of the cavity 8 and the rear portion of the recess 9. The ring groove 11 is located radially outside the rear side portion of the cavity 8. The outer diameter of the flange 4 is equal to the outer diameter of the threaded section 10.

Referring to fig. 4, a portion of the valve body 2 is depicted. The valve body 2 has an insertion hole 21, a threaded hole 22, and a valve body chamber 23 formed therein in this order from the rear end (the right end in fig. 4) toward the front in the axial direction. The insertion hole 21 directly communicates with the threaded hole 22. An annular flange 24 is arranged between the threaded hole 22 and the valve core chamber 23, but the threaded hole 22 is communicated with the valve core chamber 23. The flange 24 has a flange face 24a facing the axial rear side.

The diameter of the receptacle 21 is equal to the outer diameter of the flange 4 so that the flange 4 can form a clearance fit with the receptacle 21. The inner peripheral wall of the threaded hole 22 is formed with an internal thread 25 for engagement with the external thread of the threaded section 10. The axial length of the insertion hole 21 is substantially equal to the sum of the axial lengths of the flange 4 and the ring groove 11. The axial length of the threaded bore 22 is substantially equal to the sum of the axial lengths of the threaded section 10 and the collar 12. The internal thread 25 starts at the axially rearward end of the threaded bore 22 and terminates adjacent the flange face 24a, the internal thread 25 having an axial length greater than the axial length of the external thread of the threaded segment 10.

Returning to fig. 2, and referring to fig. 3 and 4, in a state where the solenoid core tube 1 is assembled to the valve body 2, the external thread of the threaded section 10 is engaged with the internal thread 25 of the threaded hole 22. The front end face 12a of the projecting ring 12 is axially pushed against the flange face 24a of the flange 24, thereby achieving axial positioning of the solenoid core tube 1 with respect to the valve body 2. The flange 4 is located within the receptacle 21. The ring groove 11 and the receptacle 21 (e.g., a smooth bore) together define a seal ring chamber. The ring groove 11 carries an O-ring 5 which is located in the sealing ring chamber. A retaining ring 6, which is also carried by the annular groove 11, is located in this sealing ring chamber axially behind the O-ring 5. The O-ring 5 is radially compressed and axially expanded by the solenoid core tube 1 and the valve body 2, and is elastically pressed against the back side of the retainer ring 6.

The O-ring 5 is used to seal the electromagnet core tube 1 and the valve body 2. The material of the retainer ring 6 may be rubber or plastic with a certain hardness to protect the O-ring 5 from being crushed easily when subjected to high hydraulic pressure from the inside of the valve body 2. Such materials include, but are not limited to: butadiene rubber, butyl rubber, chlorosulfonated polyethylene, epoxy rubber, ethylene-propylene-diene rubber, ethylene-propylene rubber, fluororubber, nitrile rubber perfluororubber, polyacrylate rubber, polychloroprene (neoprene), polyisoprene rubber, polysulfide rubber, polytetrafluoroethylene, silicone rubber, styrene-butadiene rubber.

The reference to an O-ring herein is to be taken in a broad sense as an O-ring, which may be circular in cross-section, or any other suitable shape, including but not limited to square, X-shaped, Q-shaped.

The configuration of the O-ring 5 is in practice adapted to the operating environment of the solenoid valve, e.g. the type of valve, the type of fluid medium, the flow rate, etc.

Since the flange 4 is seated in the insertion hole 21, not against the outer end face of the valve body 2 as in fig. 1, it is not necessary to machine a sink in the outer end face of the valve body 2. Thus, the process of manufacturing the valve body 2 is simplified.

Further, since the outer diameter of the flange 4 is equal to the outer diameter of the threaded section 10, when the end portion of the core barrel 1 is machined, a cylindrical surface portion having an outer diameter equal to the outer diameters of the flange 4 and the threaded section 10 may be machined, then the annular groove 11 and the projecting ring 12 may be cut on this cylindrical surface portion, and then an external thread may be machined at a portion between the annular groove 11 and the projecting ring 12 to form the threaded section 10. According to the certificate supply, the threaded sections and the flanges 4 with different diameters do not need to be formed as shown in fig. 1, so that the processing process of the electromagnet core tube 1 is simplified. At the same time, material is also saved.

The utility model discloses a solenoid valve has adopted the preceding terminal surface 12a axial of bulge loop 12 to push up in flange face 24a of flange 24 in order to realize the axial positioning of solenoid core pipe 1 for valve body 2, replaced pushing up the location in the heavy groove in valve body 2 through flange 4 among the prior art, this kind of mode not only makes the structure of solenoid valve can be compacter, has saved the shared space of solenoid valve, still make location and sealed independent each other in addition, in order to obtain more reliable solenoid valve.

It is noted that the collar 6 is not essential. For example, in the modification shown in fig. 5, the retainer ring 6 is eliminated, and the O-ring 5 is provided only in the ring groove 11. Other aspects of the modification shown in fig. 5 are the same as those in fig. 2 to 4, and the description will not be repeated.

Where O-rings and retaining rings are provided, the axial length of the groove 11 is configured to accommodate the configuration of the O-rings and retaining rings with which it is to be fitted, including but not limited to their shape, size and axial length.

Without a retaining ring, the axial length of the annular groove 11 is configured to accommodate an O-ring that fits therewith, including but not limited to its shape, size, and axial length.

In addition, the retainer ring 6 may be replaced with another O-ring.

According to a further variant, not shown, the diameter of the flange 4 (receptacle 21) may be slightly larger than the outer diameter of the threaded segment 10 (internal thread 25).

Further alternatively, the axial rear end surface (the right end surface in fig. 4) of the flange 4 and the axial rear end surface of the valve body 2 may be configured to be aligned. In an embodiment not shown, a sealing device may further be arranged at the end face formed by the axially rear end face of the aligned flange 4 and the axially rear end face of the valve body 2.

Other modifications to the electromagnet mounting structure described herein may be made by those skilled in the art to suit the particular application.

It should also be noted that, for a two-position electromagnetic valve, the electromagnetic valve may be installed at one axial end of the valve body, and a return spring may be installed at the other axial end of the valve body; for a three-position solenoid valve, the solenoid valve and the corresponding axially opposite return springs may be mounted at each axial end of the valve body.

It is also noted that other configurations of the solenoid valve may be used in the prior art, apart from the details of the construction described herein, and will not be described here.

Although the present application has been described herein with reference to particular embodiments, the scope of the present application is not intended to be limited to the details shown. Various modifications may be made to these details without departing from the underlying principles of the application.

Claims

1. A solenoid valve, comprising:

a valve body (2);

a valve spool axially movable in the valve body; and

the electromagnet and the return spring act on the valve core along the axial opposite direction, and the electromagnet comprises an electromagnet core tube (1) arranged at the axial end part of the valve body;

characterized in that, in the axial end portion of the valve body, an insertion hole (21) opened to an end surface, a threaded hole (22) located on a front side of the insertion hole (21), and an annular flange (24) located on a front side of the threaded hole are formed;

the electromagnetic iron core pipe comprises a flange (4) and a threaded section (10) located on the axial front side of the flange (4), an annular groove (11) is formed between the flange (4) and the threaded section (10), and a tail end convex ring (12) with the outer diameter being reduced relative to the threaded section (10) is formed on the axial front side of the threaded section (10);

the thread section (10) is meshed in the threaded hole (22), the tail end convex ring (12) is pushed against the annular flange (24), the flange (4) is completely or partially accommodated in the insertion hole (21), and an O-shaped ring (5) is arranged in the annular groove (11).

2. The solenoid valve according to claim 1, characterized in that in the annular groove (11) there is also placed a retaining ring (6) located axially behind the O-ring (5) to prevent the O-ring (5) from collapsing when subjected to high hydraulic forces.

3. The solenoid valve according to claim 1, characterised in that the outer diameter of the flange (4) is greater than or equal to the outer diameter of the threaded section (10).

4. The solenoid valve according to claim 1, characterised in that said terminal collar (12) has a front end face against which said annular flange (24) has a stop face facing towards the open side of said insertion hole (21), said front end face being pushed.

5. The solenoid valve according to claim 1, characterized in that said receptacle (21) is a plain bore, said annular groove (11) defining together with the receptacle (21) a sealing ring chamber.

6. The solenoid valve according to any one of claims 1 to 5, characterised in that the axial length of the receptacle (21) is equal to the sum of the axial lengths of the flange (4) and the annular groove (11).

7. The solenoid valve according to claim 6, characterized in that the axial length of said threaded hole (22) is equal to the sum of the axial lengths of the threaded section (10) and the terminal collar (12).

8. The solenoid valve according to any one of claims 1 to 5, characterized in that the axial length of the internal thread (25) of the threaded bore (22) is greater than the axial length of the external thread of the threaded section (10).

9. The solenoid valve according to any of claims 1 to 5, characterized in that the electromagnet is provided at one axial end of the valve body (2) and the return spring is provided at the other axial end of the valve body (2).

10. A solenoid valve according to any one of claims 1 to 5, characterised in that the electromagnet and the corresponding return spring are provided at each axial end of the valve body (2).