A proportional pressure reducing valve

Abstract

This invention discloses a proportional pressure reducing valve, comprising a valve sleeve with an oil inlet and an oil return port. An axially movable valve core is housed within the valve sleeve, and an oil outlet channel with a connecting hole is located within the valve core. An oil outlet is located at the right end of the valve sleeve, and a hollow guide is fixed at the oil outlet, allowing the valve core to move along the guide. The left end of the valve core passes through the valve sleeve and is inserted into a ejector pin. A limit pin is radially inserted at this connection point. This invention uses the guide to guide and support the valve core, ensuring its coaxiality with the valve sleeve. The limit pin facilitates the disassembly and reassembly of the valve core and ejector pin, and, in conjunction with a spring, eliminates the need for a limiting platform.

Description

Technical Field

[0001] This utility model relates to the field of pressure reducing valve technology, and in particular to a proportional pressure reducing valve. Background Technology

[0002] The proportional pressure reducing valve is an important component of the directional proportional valve assembly, serving to reduce and stabilize pressure. A proportional pressure reducing valve typically includes a solenoid valve assembly, a ejector pin, a bushing, a valve core, and a valve sleeve, etc. The valve core and ejector pin are fixedly connected within the movable cavity of the bushing. A spring is also fitted onto the valve core within the movable cavity, and a limiting platform is provided on the valve core to abut against the spring. This structure has the following problems: 1. The fixed connection between the valve core and ejector pin makes disassembly and assembly inconvenient if the valve core wears down later; 2. The need to machine the limiting platform on the valve core to facilitate its engagement with the spring increases the cost of the valve core; 3. Over time, the coaxiality between the valve core and the valve sleeve deteriorates, affecting the performance of the proportional pressure reducing valve. Utility Model Content

[0003] This utility model proposes a proportional pressure reducing valve, in which the guide component provides guidance and support for the valve core, ensuring its coaxiality with the valve sleeve; the setting of the limiting pin facilitates the disassembly and connection of the valve core and the ejector pin, and at the same time, in cooperation with the spring, the setting of the limiting platform is eliminated.

[0004] The technical solution of this utility model is implemented as follows: A proportional pressure reducing valve includes a valve sleeve, an oil inlet and an oil return port, an axially movable valve core inside the valve sleeve, an oil outlet channel inside the valve core, a connecting hole in the oil outlet channel, an oil outlet at the right end of the valve sleeve, a hollow guide fixed at the oil outlet, and the valve core moving along the guide; the left end of the valve core passes through the valve sleeve and is connected to a push pin, and a limit pin is inserted radially at the connection point.

[0005] Furthermore, a bushing is provided at the left end of the valve sleeve, and a movable cavity is provided inside the bushing. The left end of the valve core passes through the valve sleeve and is placed in the movable cavity. The valve core and the ejector pin are inserted into the movable cavity.

[0006] Furthermore, a support spring is provided inside the movable cavity. The support spring is fitted onto the valve core and abuts against the limit pin.

[0007] Furthermore, the axial length of the limiting pin is less than the inner diameter of the movable cavity and greater than the outer diameter of the valve core, and the difference between the outer diameter of the valve core and the inner diameter of the movable cavity is less than the axial length of the limiting pin. This restriction prevents the limiting pin from detaching from the connection between the valve core and the ejector pin, while not affecting the axial movement of the valve core.

[0008] Furthermore, the guide component includes a connecting block fixed at the oil outlet. An axial through hole is provided within the connecting block, communicating with the valve sleeve. An axial guide tube is provided at one end of the connecting block near the valve core, and a sliding groove is provided on the valve core to mate with the guide tube. The guide tube serves to support and guide the valve, while the axial through hole facilitates oil discharge.

[0009] The beneficial effects of this utility model are: This invention utilizes a guide component to support and guide the axial movement of the valve core, ensuring the coaxiality of the valve core and valve sleeve. Simultaneously, the guide component is hollow, thus not affecting oil flow. The limiting pin securely connects the valve core and the ejector pin, preventing detachment and facilitating assembly and disassembly. Furthermore, the limiting pin, in conjunction with the support spring, eliminates the need for a limiting platform structure at the valve core end, reducing valve core costs. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Valve sleeve 1, oil inlet 2, oil return port 3, valve core 4, oil outlet channel 5, connecting hole 6, shoulder groove 7, oil outlet 8, connecting block 9, axial through hole 10, guide cylinder 11, bushing 12, movable cavity 13, limit pin 14, support spring 15, armature block 16. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] like Figure 1 As shown, a proportional pressure reducing valve includes a valve sleeve 1, an oil inlet 2 and an oil return port 3 on the valve sleeve 1, an axially movable valve core 4 inside the valve sleeve 1, an oil outlet channel 5 on the same axis inside the valve core 4, a connecting hole 6 on the oil outlet channel 5, and a shoulder groove 7 communicating with the connecting hole 6 on the outer side wall of the valve core 4.

[0015] The right end of the valve sleeve 1 is provided with an oil outlet 8. A hollow guide component is fixed at the oil outlet 8. The guide component includes a connecting block 9, which is fixed to the oil outlet 8 by threads. An axial through hole 10 is provided inside the connecting block 9, which communicates with the inside of the valve sleeve 1 to facilitate oil discharge. An axial guide cylinder 11 is fixed to one end of the connecting block 9 near the valve core 4. The guide cylinder 11 and the connecting block 9 are integral structures. The valve core 4 is provided with a sliding groove that mates with the guide cylinder 11. The guide cylinder 11 is placed in the sliding groove, and the valve core 4 moves along the guide cylinder 11 to ensure that the valve core 4 moves axially.

[0016] The left end of valve sleeve 1 is threadedly connected to bushing 12. Bushing 12 has a movable cavity 13. The left end of valve core 4 passes through valve sleeve 1 and is placed within the movable cavity 13. Valve core 4 and ejector pin are inserted into the movable cavity 13. A insertion groove is provided at the left end of valve core 4, and the end of ejector pin is engaged with the insertion groove. A limit pin 14 is radially inserted at this insertion point. The axial length of the limit pin 14 is less than the inner diameter of the movable cavity 13 and greater than the outer diameter of valve core 4. The difference between the outer diameter of valve core 4 and the inner diameter of the movable cavity 13 is less than the axial length of the limit pin 14. The limit pin 14 does not affect the axial movement of valve core 4 within the movable cavity 13. Simultaneously, due to the restriction of the movable cavity 13, it will not detach from the insertion point of valve core 4 and ejector pin, thus preventing separation of valve core 4 and ejector pin.

[0017] A support spring 15 is provided in the movable cavity 13. The support spring 15 is fitted on the valve core 4 and abuts against the limit pin 14. The ejector pin is connected to the armature block 16 of the electromagnet assembly. The electromagnet assembly is an existing structure. When the electromagnet assembly is energized, the armature block 16 drives the ejector pin to move. When the ejector pin pushes the valve core 4 to move axially, the limit pin 14 pushes the support spring 15 to compress. When the electromagnet assembly is de-energized, the support spring 15 extends and pushes the pin to reset, thereby driving the valve core 4, ejector pin and armature block 16 to reset.

[0018] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A proportional pressure reducing valve, comprising a valve sleeve having an oil inlet and an oil return port, an axially movable valve core disposed within the valve sleeve, an oil outlet channel disposed within the valve core, a connecting hole disposed on the oil outlet channel, and an oil outlet at the right end of the valve sleeve, characterized in that: A hollow guide is fixed at the oil outlet, and the valve core moves along the guide. The left end of the valve core passes through the valve sleeve and is connected to the ejector pin. A limit pin is inserted radially at the connection point.

2. The proportional pressure reducing valve according to claim 1, characterized in that: A bushing is provided at the left end of the valve sleeve, and a movable cavity is provided inside the bushing. The left end of the valve core passes through the valve sleeve and is placed in the movable cavity. The valve core and the ejector pin are inserted into the movable cavity.

3. A proportional pressure reducing valve according to claim 2, characterized in that: A support spring is installed inside the movable cavity. The support spring is fitted onto the valve core and abuts against the limit pin.

4. A proportional pressure reducing valve according to claim 2 or 3, characterized in that: The shaft length of the limit pin is less than the inner diameter of the movable cavity and greater than the outer diameter of the valve core. The difference between the outer diameter of the valve core and the inner diameter of the movable cavity is less than the shaft length of the limit pin.

5. A proportional pressure reducing valve according to claim 1, characterized in that: The guide includes a connecting block, which is fixed at the oil outlet. An axial through hole is provided inside the connecting block, which communicates with the valve sleeve. An axial guide tube is provided at one end of the connecting block near the valve core, and a sliding groove that mates with the guide tube is provided on the valve core.

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