CN111997956A

CN111997956A - Hydraulic speed regulating valve

Info

Publication number: CN111997956A
Application number: CN202010811410.XA
Authority: CN
Inventors: 张静静; 耿永红
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2020-11-27

Abstract

The invention discloses a hydraulic speed regulating valve which comprises a valve body, wherein a P port, an A port and a T port are formed in the side surface of the valve body; the left end of the valve body is provided with a first valve hole and a second valve hole; a valve cover is fixedly arranged at the left end of the valve body, and a third valve hole is formed in the valve cover; the third valve hole is connected with a first sliding rod in a sliding mode, the right end of the first sliding rod is provided with a cone valve core, the second valve hole is connected with a second sliding rod in a sliding mode, and a connecting rod is arranged between the left end of the second sliding rod and the right end of the cone valve core; a fourth valve hole, a fifth valve hole and a sixth valve hole are formed in the left side of the valve body; a valve sleeve is fixedly arranged in the fifth valve hole, and a first sliding hole, a second sliding hole and a third sliding hole are sequentially arranged in the valve sleeve from right to left; an overflow valve core is connected in the first sliding hole in a sliding manner; the left plug is internally and slidably connected with a throttle valve core; a throttling hole is arranged in the throttling valve core; the hydraulic speed regulating valve is simple in structure, compact in size and low in manufacturing cost.

Description

Hydraulic speed regulating valve

Technical Field

The invention belongs to the technical field of hydraulic valves, and particularly relates to a hydraulic speed regulating valve.

Background

The hydraulic speed regulating valve is used for keeping the flow of the hydraulic oil at a set value and not changing along with the change of an external load. At present, most of speed regulating valves in the market are formed by connecting a fixed-differential pressure reducing valve and a throttle valve in series, the principle is that the flow of hydraulic oil is regulated through the throttle valve, the fixed-differential pressure reducing valve automatically compensates the influence of load change, so that the pressure difference between the front and the back of the throttle valve is a fixed value, and the influence of the load change on the flow is eliminated. For example, the invention patent with application number 201320323049.1, entitled fast speed regulating valve, includes a pressure reducing valve, a throttle valve connected in series with the pressure reducing valve, an oil inlet arranged at one side of the pressure reducing valve and communicated with the pressure reducing valve, an oil outlet arranged at one side of the throttle valve and communicated with the throttle valve, a pressure reducing port arranged on the pressure reducing valve, and a throttle port arranged on the throttle valve, wherein a first channel and a second channel are arranged between the pressure reducing valve and the throttle valve, two ends of the first channel are respectively communicated with the pressure reducing valve and the side part of the throttle valve, one end of the second channel is communicated with the left end of the. The working principle of the speed regulating valve is as follows: the pressure before and after the throttle valve is respectively led to two ends of a valve core of the pressure reducing valve, when the load pressure is increased, the hydraulic pressure acting on the pressure reducing valve core is increased or reduced, and the opening of the valve core is opened and closed, so that the differential pressure of the throttle valve is kept unchanged; and vice versa. However, in the actual use process, there is a problem that the speed regulating valve does not have a safety protection function, and in order to perform safety protection on the execution elements such as the hydraulic cylinder or the hydraulic motor, the speed regulating valve must be used together with the overflow valve when in use, when the hydraulic cylinder or the hydraulic motor controlled by the speed regulating valve moves to a terminal position, the pressure at the outlet of the speed regulating valve rises sharply, the overflow valve behind the speed regulating valve is opened, and because the hydraulic cylinder or the hydraulic motor stops moving at the moment, the oil at the outlet of the speed regulating valve overflows from the overflow valve to the oil tank, so that not only is the energy consumption larger, the system is heated seriously, but also the flow requirements of other hydraulic branches are influenced.

Disclosure of Invention

The invention aims to provide a hydraulic speed regulating valve which is simple in structure, compact in size and low in manufacturing cost.

In order to achieve the purpose, the invention provides the following technical scheme:

a hydraulic speed regulating valve comprises a valve body, wherein a port P, a port A and a port T are arranged on the side surface of the valve body; the left end of the valve body is provided with a first valve hole, the right end of the first valve hole in the valve body is provided with a second valve hole communicated with the port P, and the first valve hole and the second valve hole are coaxially arranged; the valve body is fixedly provided with a valve cover at the left end of the first valve hole, a third valve hole which is communicated with the first valve hole and is coaxially arranged is arranged in the valve cover, and the diameters of the third valve hole and the second valve hole are the same; the third valve hole is connected with a first sliding rod in a sliding mode, a conical valve core used for controlling the size of an opening at the left end of the second valve hole is arranged at the right end of the first sliding rod, a second sliding rod is connected in the second valve hole in a sliding mode, and a connecting rod is arranged between the left end of the second sliding rod and the right end of the conical valve core; a left cavity communicated with the first valve hole is formed between the left end of the first sliding rod and the left end of the third valve hole in the third valve hole, a right cavity is formed between the right end of the second sliding rod and the right end of the second valve hole in the second valve hole, and a first spring used for forcing the second sliding rod to move leftwards is arranged in the right cavity;

a fourth valve hole communicated with the first valve hole is formed in the left side of the valve body, a fifth valve hole communicated with the T port is formed in the right side of the valve body, and a sixth valve hole which extends leftwards and is communicated with the A port is formed in the left end of the fifth valve hole in the valve body; the fourth valve hole, the fifth valve hole and the sixth valve hole are coaxially arranged; a communicating hole for communicating the fourth valve hole and the fifth valve hole is formed in the valve body; the left end of the fourth valve hole is provided with a left plug, a valve sleeve is fixedly arranged in the fifth valve hole, and a first sliding hole communicated with the T port, a second sliding hole communicated with the right cavity and a third sliding hole communicated with the sixth valve hole are sequentially arranged in the valve sleeve from right to left; an overflow valve core used for controlling the on-off of the second sliding hole is connected in the first sliding hole in a sliding manner; a throttle valve core which penetrates through the communicating hole and is connected with the overflow valve core is connected in the left plug in a sliding manner, and a through-flow gap is formed between the inner side wall of the third sliding hole and the outer side of the throttle valve core; a throttling hole communicated with the fourth valve hole and a first through hole for communicating the throttling hole with the sixth valve hole are formed in the throttling valve core;

when the pressure of the port A is smaller than the set pressure of the overflow valve core, the pressure difference between the left chamber and the right chamber is constant; when the pressure of the port A reaches the set pressure of the overflow valve core, the overflow valve core is opened, the opening degree of the throttling hole is reduced, and the port A stops outputting.

Furthermore, a right plug is fixedly arranged at the right end of the first sliding hole; the right plug is internally threaded with an adjusting screw rod, the left end of the adjusting screw rod is provided with a piston body connected in a first sliding hole in a sliding manner, and a second spring used for forcing the overflow valve core to be tightly pressed on a second sliding hole is arranged between the overflow valve core and the piston body in the first sliding hole.

Furthermore, a second through hole for communicating the sixth valve hole with the port A and a fifth through hole for communicating the port P with the second valve hole are formed in the valve body; be equipped with first annular on the inside wall of fifth valve opening, be equipped with the third through-hole that is used for communicateing T mouth and first annular in the valve body, be equipped with the fourth through-hole that is used for communicateing first slide opening and first annular in the valve barrel.

Further, the valve barrel is equipped with the second annular groove in the outside that is close to the left end, be equipped with the sixth through-hole that is used for communicateing second annular groove and second sliding hole in the valve barrel, be equipped with the seventh through-hole that is used for communicateing second annular groove and right cavity room in the valve body to and be used for communicateing the eighth through-hole of first valve opening and fourth valve opening.

Furthermore, a ninth through hole for communicating the left cavity with the first valve hole is formed in the first sliding rod and the cone valve core.

Advantageous effects

Compared with the prior art, the technical scheme of the invention has the following advantages:

(1) the speed regulating valve and the overflow valve are integrated, so that the speed regulating valve is compact in size, simple in structure and low in manufacturing cost, compared with the prior art, the speed regulating valve does not need to be additionally provided with a separate safety valve, the pipeline connection is facilitated, and the overall cost of the pipeline is reduced;

(2) when the overflow valve is used, when the pressure of the port A does not reach the set pressure of the overflow valve core, the constant flow can be output no matter how the pressure of the port A changes; when the pressure of the port A reaches the set pressure of the overflow valve core, the overflow valve core is opened and drives the throttle valve core to move to reduce the opening of the throttle hole, so that when the set pressure of the overflow valve core is reached, the system reduces the flow output to the port A, the energy-saving effect is achieved, the heating of the system is reduced, and the flow requirements of other hydraulic branches can be met.

Drawings

FIG. 1 is a cross-sectional structural view of the present invention;

fig. 2 is a sectional view showing a valve body according to the present invention.

Detailed Description

Referring to fig. 1-2, a hydraulic speed regulating valve includes a valve body 1, wherein a port P, a port a and a port T are disposed on a side surface of the valve body 1; the left end of the valve body 1 is provided with a first valve hole 11, the right end of the first valve hole 11 in the valve body 1 is provided with a second valve hole 12 communicated with the port P, and the first valve hole 11 and the second valve hole 12 are coaxially arranged; the valve body 1 is fixedly provided with a valve cover 3 at the left end of the first valve hole 11, a third valve hole 31 which is communicated with the first valve hole 11 and is coaxially arranged is arranged in the valve cover 3, and the diameters of the third valve hole 31 and the second valve hole 12 are the same; the third valve hole 31 is connected with a first sliding rod 21 in a sliding manner, a cone valve core 23 used for controlling the size of an opening at the left end of the second valve hole 12 is arranged at the right end of the first sliding rod 21, a second sliding rod 22 is connected in the second valve hole 12 in a sliding manner, and a connecting rod 24 is arranged between the left end of the second sliding rod 22 and the right end of the cone valve core 23; the third valve hole 31 forms a left chamber 3a communicating with the first valve hole 11 between the left end of the first slide bar 21 and the left end of the third valve hole 31, the second valve hole 12 forms a right chamber 1a between the right end of the second slide bar 22 and the right end of the second valve hole 12, and a first spring 9 for forcing the second slide bar 22 to move leftward is provided in the right chamber 1 a.

A fourth valve hole 1d communicated with the first valve hole 11 is formed in the left side of the valve body 1, a fifth valve hole 14 communicated with the T port is formed in the right side of the valve body 1, and a sixth valve hole 1e which extends leftwards and is communicated with the A port is formed in the left end of the fifth valve hole 14 in the valve body 1; the fourth valve hole 1d, the fifth valve hole 14 and the sixth valve hole 1e are coaxially arranged; a communication hole 13 for communicating the fourth valve hole 1d and the fifth valve hole 14 is arranged in the valve body 1; a left plug 91 is arranged at the left end of the fourth valve hole 1d, a valve sleeve 5 is fixedly arranged in the fifth valve hole 14, and a first sliding hole 51 communicated with the T port, a second sliding hole 52 communicated with the right cavity 1a and a third sliding hole 53 communicated with the sixth valve hole 1e are sequentially arranged in the valve sleeve 5 from right to left; an overflow valve core 6 for controlling the on-off of the second sliding hole 52 is connected in the first sliding hole 51 in a sliding manner; the left plug 91 is internally and slidably connected with a throttle valve core 4 which penetrates through the communicating hole 13 and is connected with the relief valve core 6, and a through-flow gap 8 is formed between the inner side wall of the third sliding hole 53 and the outer side of the throttle valve core 4; an orifice 4a1 communicated with the fourth valve hole 1d and a first through hole 4a for communicating the orifice 4a1 and the sixth valve hole 1e are arranged in the throttle valve core 4; when the pressure of the port A is smaller than the set pressure of the overflow valve core 6, the pressure difference between the left chamber 3a and the right chamber 1a is constant; when the port a pressure reaches the set pressure of the relief valve body 6, the relief valve body 6 opens, the orifice 4a1 decreases in opening degree, and the port a stops outputting.

A right plug 92 is fixedly arranged at the right end of the first sliding hole 51; an adjusting screw rod 93 is connected with the right plug 92 through an internal thread, a piston body 94 which is connected in the first sliding hole 51 in a sliding mode is arranged at the left end of the adjusting screw rod 93, and a second spring 7 which is used for forcing the overflow valve core 6 to be pressed on the second sliding hole 52 is arranged between the overflow valve core 6 and the piston body 94 in the first sliding hole 51.

A second through hole 1f for communicating the sixth valve hole 1e with the port A and a fifth through hole 15 for communicating the port P with the second valve hole 12 are formed in the valve body 1; be equipped with first annular 16 on the inside wall of fifth valve opening 14, be equipped with the third through-hole 1g that is used for communicateing T mouth and first annular 16 in the valve body 1, be equipped with the fourth through-hole 5a that is used for communicateing first slide opening 51 and first annular 16 in the valve barrel 5.

The valve sleeve 5 is provided with a second annular groove 54 on the outer side near the left end, a sixth through hole 5b for communicating the second annular groove 54 with the second sliding hole 52 is arranged in the valve sleeve 5, a seventh through hole 1b for communicating the second annular groove 54 with the right chamber 1a and an eighth through hole 1c for communicating the first valve hole 11 with the fourth valve hole 1d are arranged in the valve body 1. And a ninth through hole 3a for communicating the left chamber 3a with the first valve hole 11 is formed in the first sliding rod 21 and the cone valve core 23.

When the invention is used, the P port is an inlet (generally connected with an outlet of a hydraulic pump), the A port is an outlet (generally connected with an inlet of a reversing valve), and the output flow and the highest service pressure of the A port can be adjusted. The T port is a pressure relief port.

When the pressure at the port a does not reach the set pressure of the relief valve body 6 in the speed control function, the relief valve body 6 and the throttle valve body 4 are in the positions shown in fig. 1 by the biasing force of the second spring 7, the orifice 4a1 is in the fully open position, and the hydraulic fluid at the port P flows into the port a through the fifth through hole 15, the second valve hole 12, the first valve hole 11, the eighth through hole 1c, the fourth valve hole 1d, the orifice 4a1, the first through hole 4a, the sixth valve hole 1e, and the second through hole 1 f. The first slide bar 21, the cone valve core 23, the connecting rod 24 and the second slide bar 22 are used for ensuring that the pressure difference between the front and the rear of the throttle 4a1 is kept constant, and further ensuring that the flow rate passing through the throttle 4a1 is constant. The method comprises the following specific steps: the pressure in front of the throttle hole 4a1, namely the pressure of the left chamber 3a acts on the left end of the first slide bar 21, the pressure behind the throttle hole 4a1 enters the right chamber 1a through the first through hole 4a, the sixth valve hole 1e, the gap 8, the second slide hole 52, the sixth through hole 5b, the second annular groove 54 and the seventh through hole 1b and acts on the right end of the second slide bar 22, when the pressure of the port a rises, the pressure difference between the front and the back of the throttle hole 4a1 decreases, the flow output to the port a decreases, at this time, the pressure of the right chamber 1a increases, the second slide bar 22 is pushed to move to the left, when the pressure of the second slide bar 22 moves to the left, the cone valve core 23 is driven by the connecting rod 24 to move to the left, the left end opening of the second valve hole 12 increases, the communication area between the first valve hole 11 and the second valve hole 12 increases, thereby the pressure of the left chamber 3a increases until the pressure difference between the, thus, the output flow is ensured to be constant when the pressure of the port A is increased; when the pressure of the port A is suddenly reduced, the pressure difference between the front and the back of the throttle hole 4a1 is increased, the pressure difference pushes the first sliding rod 21 to move rightwards, the first sliding rod 21 drives the cone valve core 23 to move rightwards, so that the left end opening of the second valve hole 12 is reduced, the communication area between the first valve hole 11 and the second valve hole 12 is reduced, the pressure of the left cavity 3a is reduced, and the output flow is constant when the pressure of the port A is reduced until the pressure difference between the left cavity 3a and the right cavity 1a is restored to the original size. Therefore, the invention can ensure that the output flow of the port A is constant no matter the pressure of the port A.

When the invention realizes the overflow flow limiting function, if the pressure of the port A reaches the set pressure of the overflow valve core 6, the overflow valve core 6 moves rightwards to open and drive the throttle valve core 4 to move rightwards, so that the opening degree of the throttle hole 4a1 is reduced, at the moment, the port A stops outputting because the actuator stops moving, the oil of the port P flows into the port T through the fifth through hole 15, the second valve hole 12, the first valve hole 11, the eighth through hole 1c, the fourth valve hole 1d, the throttle hole 4a1, the first through hole 4a, the sixth valve hole 1e, the gap 8, the second slide hole 52, the first slide hole 51, the fourth through hole 5a, the first ring groove 16 and the third through hole 1g, because the opening of the throttle hole 4a1 is small, the overflow flow passing through the overflow valve core 6 can be small, namely the flow supplied to the port A from the port P is reduced, the energy consumption is reduced, and the energy-saving effect is achieved, and the flow requirements of the remaining hydraulic branches can be guaranteed.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A hydraulic speed regulating valve comprises a valve body, wherein a port P, a port A and a port T are arranged on the side surface of the valve body; the left end of the valve body is provided with a first valve hole, the right end of the first valve hole in the valve body is provided with a second valve hole communicated with the port P, and the first valve hole and the second valve hole are coaxially arranged; the valve body is fixedly provided with a valve cover at the left end of the first valve hole, a third valve hole which is communicated with the first valve hole and is coaxially arranged is arranged in the valve cover, and the diameters of the third valve hole and the second valve hole are the same; the third valve hole is connected with a first sliding rod in a sliding mode, a conical valve core used for controlling the size of an opening at the left end of the second valve hole is arranged at the right end of the first sliding rod, a second sliding rod is connected in the second valve hole in a sliding mode, and a connecting rod is arranged between the left end of the second sliding rod and the right end of the conical valve core; a left cavity communicated with the first valve hole is formed between the left end of the first sliding rod and the left end of the third valve hole in the third valve hole, a right cavity is formed between the right end of the second sliding rod and the right end of the second valve hole in the second valve hole, and a first spring used for forcing the second sliding rod to move leftwards is arranged in the right cavity;

when the pressure of the port A is smaller than the set pressure of the overflow valve core, the pressure difference between the left chamber and the right chamber is constant; when the pressure of the port A reaches the set pressure of the overflow valve core, the overflow valve core is opened, and the opening degree of the throttling hole is reduced.

2. The hydraulic speed regulating valve according to claim 1, wherein a right plug is fixedly mounted at the right end of the first sliding hole; the right plug is internally threaded with an adjusting screw rod, the left end of the adjusting screw rod is provided with a piston body connected in a first sliding hole in a sliding manner, and a second spring used for forcing the overflow valve core to be tightly pressed on a second sliding hole is arranged between the overflow valve core and the piston body in the first sliding hole.

3. The hydraulic speed regulating valve according to claim 1, wherein a second through hole for communicating the sixth valve hole with the port a, and a fifth through hole for communicating the port P with the second valve hole are provided in the valve body; be equipped with first annular on the inside wall of fifth valve opening, be equipped with the third through-hole that is used for communicateing T mouth and first annular in the valve body, be equipped with the fourth through-hole that is used for communicateing first slide opening and first annular in the valve barrel.

4. The hydraulic governor valve of claim 1, wherein the valve housing is provided with a second ring groove at an outer side near the left end, a sixth through hole for communicating the second ring groove with the second slide hole is provided in the valve housing, a seventh through hole for communicating the second ring groove with the right chamber is provided in the valve body, and an eighth through hole for communicating the first valve hole with the fourth valve hole.

5. The hydraulic speed regulating valve of claim 1, wherein a ninth through hole for communicating the left chamber with the first valve hole is formed in the first sliding rod and the cone valve core.