阅读说明：本技术 一种大流量变压差自动恒流阀 (Large-flow variable-pressure-difference automatic constant flow valve ) 是由 张为荣 章良 吴辉 陈时健 潘正邦 祁崇可 马建光 于 2019-11-29 设计创作，主要内容包括：本发明属于一种大流量的、能自动控制液体瞬时流量接近恒定值的变压差流量调节阀。一种大流量变压差自动恒流阀,包括阀体,在阀体内设有阀芯,阀体前端设有弹簧盖,弹簧盖、阀体和阀芯共同形成的空腔内设置弹簧,弹簧盖上开有通孔,调节杆通过该通孔深入弹簧盖内,并且可以对弹簧施加压力。本发明的显著效果是：本发明在系统压力源变化较大的情况下稳定流量的效果好,且背压不会有太大变化,此阀结构简单,加工制造成本较低,在大流量的设计下占用空间相对较小,操作、维护比较方便。(The invention belongs to a variable pressure difference flow regulating valve which has large flow and can automatically control the instantaneous flow of liquid to be close to a constant value. The utility model provides a large-traffic automatic constant flow valve of vary voltage difference, includes the valve body, is equipped with the case in the valve body, and the valve body front end is equipped with the spring lid, sets up the spring in the cavity that spring lid, valve body and case formed jointly, and it has the through-hole to open on the spring lid, adjusts the pole and passes through this through-hole and go deep into the spring lid to can exert pressure to the spring. The invention has the following remarkable effects: the valve has the advantages of good flow stabilizing effect under the condition of large change of the pressure source of the system, no large change of the back pressure, simple structure, low processing and manufacturing cost, relatively small occupied space under the design of large flow, and convenient operation and maintenance.)

1. A large-flow variable-pressure-difference automatic constant-flow valve is characterized in that: including valve body (2), be equipped with case (4) in valve body (2), valve body (2) front end is equipped with spring cap (5), sets up spring (6) in the cavity that spring cap (5), valve body (2) and case (4) formed jointly, and it has the through-hole to open on spring cap (5), adjusts pole (7) and goes deep into in spring cap (5) through this through-hole to can exert pressure to spring (6).

2. The high-flow variable-pressure-difference automatic constant-flow valve according to claim 1, characterized in that: an end cover (1) is arranged at the rear part of the valve body (2), and the end cover (1) is fixed on the valve body (2) through a screw (8).

3. The high-flow variable-pressure-difference automatic constant-flow valve according to claim 2, characterized in that: the spring cover (5) is fixed on the valve body (2) through a screw (8).

4. A high flow variable pressure differential automatic constant flow valve according to claim 3, characterized in that: a feedback hole (a) is formed in the valve body (2), and automatic constant flow and stable backpressure are achieved through the size of the oil outlet backpressure automatic adjusting notch (b).

5. The high-flow variable-pressure-difference automatic constant-flow valve according to claim 4, characterized in that: and a mouth expander (3) is also arranged at the liquid outlet of the valve body (2) and used for stabilizing the oil outlet back pressure of the valve body (2) and ensuring the feedback regulation effect of the back pressure on the valve core (4).

6. The large-flow variable-pressure-difference automatic constant-flow valve according to claim 5, characterized in that: an oil discharge hole (c) is formed in the valve body (2) and used for discharging a small amount of hydraulic oil leaked from the dynamic seal position of the valve core (4) after the constant flow valve is used for a long time in a high-pressure state.

7. The high-flow variable-pressure-difference automatic constant-flow valve according to claim 4, characterized in that: an oil discharge hole (c) is formed in the valve body (2) and used for discharging a small amount of hydraulic oil leaked from the dynamic seal position of the valve core (4) after the constant flow valve is used for a long time in a high-pressure state.

Technical Field

The invention belongs to a variable pressure difference flow regulating valve which has large flow and can automatically control the instantaneous flow of liquid to be close to a constant value.

Background

In the hydraulic industry, in order to stabilize the flow rate of hydraulic oil and reduce the influence of load change on the flow rate, the flow rate is generally realized by a speed regulating valve or a bypass type speed regulating valve (overflow throttle valve), wherein the speed regulating valve is generally formed by connecting a fixed-difference pressure reducing valve and a throttle valve in series, and the bypass type speed regulating valve (overflow throttle valve) is generally formed by connecting the throttle valve and an overflow valve in parallel. However, the governor valve and the bypass governor valve (overflow throttle) are generally applied to a hydraulic system with a large load variation, and if the governor valve and the bypass governor valve are applied to a hydraulic system with a large pressure source variation, the change of the return oil back pressure is large, and the structures of the two valves are complex, and if the flow rate of the system is large, the volumes of the two valves are designed to be large, which wastes the space of the system.

Disclosure of Invention

The invention aims to provide a large-flow variable-pressure-difference automatic constant-flow valve aiming at the defects of the prior art.

The invention is realized by the following steps: the utility model provides a large-traffic automatic constant flow valve of vary voltage difference, includes the valve body, is equipped with the case in the valve body, and the valve body front end is equipped with the spring lid, sets up the spring in the cavity that spring lid, valve body and case formed jointly, and it has the through-hole to open on the spring lid, adjusts the pole and passes through this through-hole and go deep into the spring lid to can exert pressure to the spring.

According to the high-flow variable-pressure-difference automatic constant-flow valve, the end cover is arranged at the rear part of the valve body and is fixed on the valve body through the screw.

The automatic constant flow valve with high flow rate and variable pressure difference is characterized in that the spring cover is fixed on the valve body through a screw.

According to the high-flow variable-pressure-difference automatic constant-flow valve, the valve body is provided with the feedback hole, and the size of the notch is automatically adjusted through the oil outlet backpressure, so that automatic constant flow and backpressure stability are realized.

The high-flow variable-pressure-difference automatic constant-flow valve is characterized in that a liquid outlet of the valve body is also provided with a flaring device for stabilizing the oil outlet back pressure of the valve body and ensuring the feedback regulation effect of the back pressure on the valve core. .

The high-flow variable-pressure-difference automatic constant flow valve is characterized in that the valve body is provided with an oil discharge hole for discharging a small amount of hydraulic oil leaked from the valve core dynamic seal after the constant flow valve is used for a long time in a high-pressure state.

The high-flow variable-pressure-difference automatic constant flow valve is characterized in that the valve body is provided with an oil discharge hole for discharging a small amount of hydraulic oil leaked from the valve core dynamic seal after the constant flow valve is used for a long time in a high-pressure state.

The invention has the following remarkable effects: (1) the invention is a large-flow adjustable variable-pressure-difference flow control valve which can automatically control the flow to be close to a constant value under different inlet pressures, and the valve can be used in a hydraulic system, thereby obviously reducing the influence of pressure source change on the flow, avoiding the oil return back pressure from changing too much, and having good practical value for the hydraulic system which has larger pressure source change and requires stable flow (for example, the pressure source is an energy accumulator, the change range of the environmental temperature is large, and the pressure change of compressed gas in the energy accumulator is large).

(2) The valve has the advantages of good flow stabilizing effect under the condition of large change of the pressure source of the system, no large change of the back pressure, simple structure, low processing and manufacturing cost, relatively small occupied space under the design of large flow, and convenient operation and maintenance.

Drawings

FIG. 1 is a schematic diagram of a high flow variable pressure differential automatic constant flow valve;

FIG. 2 is a cross-sectional view of a high flow variable pressure differential automatic constant flow valve;

FIG. 3 is a flow characteristic curve of a large-flow variable-pressure-difference automatic constant-flow valve calculated by simulation software,

in the figure: 1, end cover; 2, a valve body; 3, a flaring device; 4, a valve core; 5, a spring cover; 6, a spring; 7 adjusting a rod; 8, a screw; a feedback hole; b, notches; c an oil drain hole.

The abscissa in fig. 3 is the pressure at the inlet of the valve body in bar and the ordinate is the flow through the valve in L/min.

Detailed Description

The invention is described in detail below with reference to the attached drawing figures:

referring to fig. 2, the end cover 1 is connected with the valve body 2 through a screw 8, the spring cover 5 is connected with the valve body 2 through a screw 8, the adjusting rod 7 is connected with the spring cover 5 through a thread, the valve core 4 and the spring 6 are arranged inside the valve body 2 and the spring cover 5, two ends of the valve core 4 respectively prop against the end cover 1 and the spring 6, the other end of the spring 6 props against the adjusting rod 7, and the liquid outlet of the valve body 2 is also provided with the mouth expander 3.

Referring to fig. 2, a feedback hole a is formed in the valve body 2, after hydraulic oil flows into the valve body 2, the hydraulic oil is decompressed through the notch b, the pressure is reduced, and the hydraulic oil at the outlet flows to one end of the valve core 4 through the feedback hole a, so that the back pressure at the outlet acts on the end face of the valve core 4. When the inlet pressure is increased, the back pressure is increased, the valve core 4 is pushed by the back pressure to extrude the spring 6, the valve core 4 moves to a balance position towards the spring side, the flow area of the notch b is reduced, the flow cannot be increased along with the increase of the inlet pressure, and the pressure reduction effect is enhanced due to the reduction of the notch b, so that the back pressure is reduced; when the inlet pressure is reduced, the back pressure is reduced, the spring 6 pushes the valve core 4 to move reversely to a new balance position, the flow area of the notch b is increased, therefore, the flow cannot be reduced along with the reduction of the inlet pressure, and the pressure reducing effect is weakened due to the increase of the notch b, so that the back pressure is increased. Therefore, when the inlet pressure changes, the automatic constant flow and the stable back pressure are realized through the size of the back pressure automatic adjusting window b.

Referring to FIG. 3, it can be seen that the flow through the constant flow valve can be maintained at about 2400-.

Referring to fig. 2, the valve body 2 is provided with a flaring device 3, which can stabilize the oil outlet back pressure of the valve body 2 and ensure the feedback regulation effect of the back pressure on the valve core 4.

Referring to fig. 2, an adjusting rod 7 is mounted on the spring cover 5, the adjusting rod 7 is in threaded connection with the spring cover 5, a hexagonal head is arranged at the end of the adjusting rod 7, and the pre-tightening force of the spring 6 can be adjusted by rotating the adjusting rod 7 so as to adjust the flow of the constant flow valve.

Referring to fig. 2, the valve body 2 is provided with an oil discharge hole c, and as the sealing mode between the valve core 4 and the valve body 2 belongs to radial dynamic sealing, a little hydraulic oil leaks under long-term high-pressure action, and the leaked hydraulic oil can be introduced into an external oil collecting device through the oil discharge hole c.