CN211779146U

CN211779146U - Pressure positive feedback direct-acting three-way proportional pressure reducing valve

Info

Publication number: CN211779146U
Application number: CN202020078980.8U
Authority: CN
Inventors: 胡海滨; 李旭阳; 侯红玲
Original assignee: Shaanxi University of Technology
Current assignee: Shaanxi University of Technology
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-10-27
Anticipated expiration: 2030-01-15

Abstract

A pressure positive feedback direct-acting three-way proportional pressure reducing valve comprises a proportional electromagnet, an electromagnet push rod, a pressure regulating spring, a valve body and a valve core; the electromagnet push rod is connected with the valve body, one end of the electromagnet push rod is connected with the pressure setting spring, and the other end of the electromagnet push rod extends out of the shell and is connected with the proportional electromagnet; the valve core is tightly matched with the valve body and can slide in the valve body along the axis; the valve body is provided with an oil inlet P, a throttling port B and an oil return port T; the area of the control cavity at the upper end of the valve core is smaller than that of the control cavity at the lower end of the valve core; the pressure of the valve outlet is introduced into one side with small area of the control cavity as positive feedback and introduced into one side with large area of the control cavity as negative feedback; the valve core makes corresponding displacement under the condition that the stress at two ends is not uniform A, the pressure at the outlet of the valve is controlled, and the pressure is in a linear relation with the input current of the proportional electromagnet.

Description

Pressure positive feedback direct-acting three-way proportional pressure reducing valve

Technical Field

The utility model belongs to the technical field of fluid drive and control, a pressure positive feedback direct action formula tee bend proportion relief pressure valve is related to.

Background

The pressure reducing valve is mainly used for reducing the pressure of a medium, and meanwhile, the opening degree of the opening and closing piece is adjusted by means of the action of the pressure behind the valve, so that the pressure behind the valve is kept within a certain range, and the outlet pressure is kept within a set range under the condition that the inlet pressure is continuously changed, so that the subsequent appliances for life production are protected; in real life, the pressure reducing valve is applied to a high-rise water supply system, an underground gas supply system and a hydraulic system in a city.

The common three-way pressure reducing valve generally adopts a pressure negative feedback structural form, namely, the pressure at the outlet of the valve is used as the driving force of a valve core to promote the area of a throttling opening of a valve port to be reduced, so that the outlet flow of the valve is reduced, and the response speed of the valve is lower by simply adopting the negative feedback structural form.

Therefore, designing a pressure positive feedback direct-acting three-way proportional pressure reducing valve is especially important for improving the response speed of the pressure reducing valve and the adjustment sensitivity of a hydraulic system.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model aims to provide a pressure positive feedback direct-acting three-way proportional pressure reducing valve.

The utility model adopts the following technical proposal:

a pressure positive feedback direct-acting three-way proportional pressure reducing valve comprises a proportional electromagnet 1, an electromagnet push rod 2, a pressure regulating spring 3, a valve body 4 and a valve core 5; the electromagnet push rod 2 is connected with the valve body 4, and the valve body 4 can slide along the axis of the electromagnet push rod 2; one end of the electromagnet push rod 2 is connected with the pressure regulating spring 3, and the other end of the electromagnet push rod 2 extends out of the shell and is connected with the proportional electromagnet 1.

The valve core 5 is in a stepped five-section outer cylinder form, is packaged in the valve body 4 and is tightly matched with the valve body 4; the upper end surface of the valve core 5 and the inner cavity of the valve body 4 form an upper oil cavity A1, and the lower end surface of the valve core 5 and the inner cavity of the valve body 4 form a lower oil cavity A2; an oil inlet P, a throttling port B, an upper oil return port C and an oil return port T are formed in the side face of the valve body 4, and a lower oil return port D is formed in the lower end face of the valve body 4; the throttle orifice B, the upper oil return port C and the lower oil return port D are communicated with the oil outlet A through pipelines; the valve body 5 is linearly slidable in the valve body 4, and the linear sliding of the valve body 5 enables the intermediate land of the valve body 5 to adjust the opening degree of the orifice B.

The pressure at the oil outlet A is led into an upper oil cavity A1 of the valve core 5 as positive feedback, and is led into a lower oil cavity A2 of the valve core 5 as negative feedback.

The utility model has the advantages that: a pressure positive feedback direct-acting three-way proportional pressure reducing valve introduces pressure oil at an oil outlet A into an oil cavity A1 on a valve body 4 as pressure positive feedback; pressure oil at the oil outlet A is introduced into the lower oil cavity A2 of the valve body 4 to serve as negative feedback; during the valve operation, the valve core 5 is driven by different hydraulic pressures from the upper oil chamber a1 and the lower oil chamber a2, so that the valve core 5 is displaced, and the response speed of the valve can be remarkably improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, a pressure positive feedback direct-acting three-way proportional pressure reducing valve comprises a proportional electromagnet 1, an electromagnet push rod 2, a pressure regulating spring 3, a valve body 4 and a valve core 5; the electromagnet push rod 2 is connected with the valve body 4, and the valve body 4 can slide along the axis of the electromagnet push rod 2; one end of the electromagnet push rod 2 is connected with the pressure regulating spring 3, and the other end of the electromagnet push rod 2 extends out of the shell and is connected with the proportional electromagnet 1; the valve core 5 is in a step-shaped five-section outer cylinder form, is packaged in the valve body 4 and is tightly matched with the valve body 4, and the upper end of the valve core 5 is connected with the pressure regulating spring 3; an oil inlet P, a throttling port B and an upper oil return port C are formed in the side face of the valve body 4, and a lower oil return port D is formed in the lower end face of the valve body 4; the upper oil return port C, the lower oil return port D and the throttle B are communicated with the oil outlet A through pipelines; the valve core 5 can slide linearly in the valve body 4, and the linear sliding of the valve core 5 can enable the middle shoulder of the valve core 5 to adjust the opening degree of the throttling port B; oil enters from the oil inlet P and flows out from the oil outlet A to enter the execution element; when the valve core 5 moves upward to completely close the upper limit position of the throttle B, the oil at the oil outlet a can flow back to the oil tank from the lower oil chamber a2 through the oil return port T.

The utility model discloses a working process does:

high-pressure oil enters the valve body 4 from the oil inlet P and flows out of the valve body 4 through the throttling port B to the oil outlet A to enter an execution element; at the oil outlet A, oil enters an upper oil chamber A1 through an upper oil return port C and enters a lower oil chamber A2 through a lower oil return port D, wherein the upper oil chamber A1 plays a role in positive pressure feedback, and the lower oil chamber A2 plays a role in negative pressure feedback; the valve core 5 is in a step-shaped five-section outer cylinder form, the upper and lower stress surfaces of the valve core 5 are different and generate pressure difference, when the stress of the valve core 5 at the lower oil cavity A2 is greater than that at the upper oil cavity A1, the valve core 5 moves upwards, the flow area at the throttling port B is reduced, and the flow passing through the throttling port B is reduced, so that the pressure at the oil outlet A is ensured to be the set pressure value of the spring; when the pressure of the oil outlet A rises to a certain value, an oil path flowing from the oil inlet P to the oil outlet A is closed, the lower end of the valve core 5 is higher than the oil return port T, oil in the lower oil cavity A2 flows back to the oil tank from the oil return port T, the pressure of the oil outlet A is reduced to be the set value of the pressure regulating spring 3, and the set value of the pressure regulating spring 3 is set by the proportional electromagnet 1; the set value is in direct proportion to the current value input into the proportional electromagnet 1.

Claims

1. The utility model provides a pressure positive feedback direct action formula three-way proportional pressure reducing valve which characterized in that: comprises a proportional electromagnet (1), an electromagnet push rod (2), a pressure regulating spring (3), a valve body (4) and a valve core (5); the electromagnet push rod (2) is connected with the valve body (4), and the valve body (4) can slide along the axis of the electromagnet push rod (2); one end of the electromagnet push rod (2) is connected with the pressure regulating spring (3), and the other end of the electromagnet push rod (2) extends out of the shell and is connected with the proportional electromagnet (1);

the valve core (5) is in a stepped five-section outer cylinder form, is packaged in the valve body (4) and is tightly matched with the valve body (4); the upper end surface of the valve core (5) and the inner cavity of the valve body (4) form an upper oil cavity A1, and the lower end surface of the valve core (5) and the inner cavity of the valve body (4) form a lower oil cavity A2; an oil inlet P, a throttling port B, an upper oil return port C and an oil return port T are formed in the side face of the valve body (4), and a lower oil return port D is formed in the lower end face of the valve body (4); the throttle orifice B, the upper oil return port C and the lower oil return port D are communicated with the oil outlet A through pipelines; the valve core (5) can slide linearly in the valve body (4), and the linear sliding of the valve core (5) can enable the middle shoulder of the valve core (5) to adjust the opening degree of the throttle orifice B.

2. A pressure positive feedback direct acting three-way proportional pressure reducing valve according to claim 1, wherein: the pressure at the oil outlet A is led into an upper oil cavity A1 of the valve core (5) as positive feedback, and is led into a lower oil cavity A2 of the valve core (5) as negative feedback.