CN103161791B - Bidirectional proportional pressure regulating mechanism - Google Patents

Abstract

The two-way proportional pressure regulating mechanism includes a fluid laminar flow realization mechanism, a first pressure-taking point, a second pressure-taking point, and a pressure-taking point position adjustment mechanism; the fluid laminar flow realization mechanism includes a valve core and a valve sleeve, and the valve sleeve is An oil inlet, a first oil outlet and a second oil outlet are set, and the oil inlet is arranged between the first oil outlet and the second oil outlet; the two ends of the valve core A working step matching the inner diameter of the valve sleeve is set; the working step of the spool and the gap between the valve sleeve communicate with the oil inlet, the first oil outlet and the second oil outlet; the first pressure-taking point and the second pressure-taking point The pressure points are all through the pressure-taking holes of the valve sleeve, and the pressure-taking holes are connected to the gap; the pressure-taking point position adjustment mechanism includes the valve core and the pusher that pushes the valve core to move in the valve sleeve. Components, the movement of the spool changes _L1 and _L2 between 0-L. The beneficial effects of the present invention are: adopting two-way linear motion to realize two-way differential proportional stable voltage regulation; and high control sensitivity.

Description

Two-way proportional pressure regulating mechanism

technical field

The invention relates to a two-way proportional pressure regulating mechanism.

Background technique

Proportional pressure control valves are often used as pilot valves to form two-stage or three-stage valves. For example, the electro-hydraulic proportional reversing valve is composed of an electromagnetic force motor, a proportional pressure reducing valve and a hydraulic directional valve. Balance, so as to control the displacement opening of the reversing main valve. The general proportional reversing valve is mostly two-way proportional control, but there are problems of lack of control sensitivity and difficult processing.

Contents of the invention

In order to solve the problems of lack of control sensitivity and unstable pressure of the current bidirectional valve, the present invention proposes a bidirectional proportional pressure regulating mechanism with high control sensitivity, stable pressure regulation and low processing difficulty.

The two-way proportional pressure regulating mechanism proposed by the invention adopts the principle of pressure loss along the laminar flow of fluid flow to control the pressure, and realizes two-way proportional control by moving left and right. Take the laminar flow of fluid in a round tube as an example (see Figure 1), when the ratio of the length to diameter of the round tube l/d>4, it is called a slender hole, and the flow through the slender hole generally presents a laminar flow Flow, according to the force of the fluid in the pipeline and the formula of laminar flow in the circular tube is:

$\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&pi;d</span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}}{\mathrm{<span\; class="notranslate">\; 128</span>}\mathrm{<span\; class="notranslate">\; \&mu;l</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, Q is the flow rate through the small hole; d is the diameter of the circular tube; μ is the viscosity coefficient of the oil; P _s is the pressure at the oil inlet; P _o is the pressure at the oil outlet; l is the length of the circular tube.

The two-way proportional pressure regulating mechanism of the present invention is characterized in that it includes a fluid laminar flow realization mechanism, a first pressure taking point, a second pressure taking point and a pressure taking point position adjustment mechanism;

The fluid laminar flow realization mechanism includes a valve core and a valve sleeve, the valve sleeve is provided with an oil inlet, a first oil outlet and a second oil outlet, and the oil inlet is arranged at the first oil outlet Between the port and the second oil outlet; the two ends of the valve core are provided with working steps matching the inner diameter of the valve sleeve; the working steps of the valve core and the gap between the valve sleeve are connected to the oil inlet, the first outlet The oil port and the second oil outlet, the gap is a laminar laminar flow channel, the fluid flow in the gap presents a laminar flow state, the oil inlet, the first oil outlet, and the second oil outlet The pressure distribution presents a stable linear distribution;

Both the first pressure-taking point and the second pressure-taking point are pressure-taking holes penetrating the valve sleeve, the pressure-taking hole communicates with the gap, and the first pressure-taking point is set at the first oil outlet port and the oil inlet, the second pressure point is set between the second oil outlet and the oil inlet, and the first pressure point and the second The distance between the two pressure tapping points is equal to the length of the spool, and the pressure at the first pressure tapping point and the second pressure tapping point satisfies the following formula:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Among them, P _a is the pressure at the first pressure-taking point; P _b is the pressure at the second pressure-taking point; P _s is the pressure at the oil inlet; P _o is the pressure at the first oil outlet or the second oil outlet pressure; L ₁ is the distance between the first pressure point and the first oil outlet; L ₂ is the distance between the second pressure point and the second oil outlet; L is the distance between each working step and the valve sleeve The length of the laminar flow channel; and the value range of L ₁ and L ₂ are both 0 ~ L; the value range of P _a and P _b are both P _o ~ P _s ;

The pressure-taking point position adjustment mechanism includes the spool and the pushing part that pushes the spool to move in the valve sleeve, and the movement of the spool changes _L1 and _L2 between 0-L.

The gap can be a slit or an elongated hole and any channel that makes the fluid flow appear as a laminar flow state.

The valve core moves along the axial direction of the valve sleeve, the gap is distributed in a straight line, the first oil outlet and the second oil outlet are arranged outside the two ends of the valve core, the The above-mentioned oil inlet is arranged between the two working steps of the above-mentioned spool.

The working steps at both ends of the spool are distributed symmetrically along the center line of the spool.

The first pressure-taking point and the second pressure-taking point are distributed symmetrically along the center of the valve sleeve.

The working principle of the present invention is: when the valve core slides along the valve sleeve to the first oil outlet, the length of the gap formed between the working step of the valve core near the first oil outlet and the valve sleeve remains unchanged, while the gap between the valve sleeve near the first oil outlet remains unchanged. The working step of the spool at the second oil outlet crosses the second pressure point, so that the distance between the first pressure point and the first oil outlet gradually increases, and at the same time, the distance between the second pressure point and the second oil outlet It is always 0, so that the pressure at the first pressure-taking point increases gradually, while the pressure at the second pressure-taking point remains unchanged. According to the pressure calculation formulas at the first pressure-taking point and the second pressure-taking point: In the process of the pressure at the first pressure taking point changing linearly with the distance between the first pressure taking point and the first oil outlet, the pressure at the second pressure taking point is equal to the pressure at the second oil outlet; otherwise , when the spool slides along the valve sleeve to the second oil outlet, the length of the gap formed between the working step of the spool near the second oil outlet and the valve sleeve remains unchanged, while the working step near the first oil outlet The working step of the spool crosses the first pressure-taking point, so that the distance between the first pressure-taking point and the first oil outlet is always 0, and the distance between the second pressure-taking point and the second oil outlet gradually increases, thereby realizing the first The pressure at the first pressure measuring point remains constant, and the pressure at the second pressure measuring point gradually increases. According to the pressure calculation formulas at the first pressure measuring point and the second pressure measuring point, it can be known that the pressure at the second pressure measuring point follows the When the distance between the second pressure point and the second oil outlet changes linearly, the pressure at the first pressure point is equal to the pressure at the first oil outlet, so that during the entire movement of the spool Realize the steady pressure regulation function of the two-way proportional pressure regulation mechanism.

The beneficial effects of the invention are as follows: the pressure regulating mechanism adopts left and right bidirectional linear motions to realize bidirectional proportional pressure regulation; the pressure regulation is stable; the control sensitivity is high; and the processing difficulty is low.

Description of drawings

Figure 1 is a schematic diagram of fluid laminar pressure distribution (where P is the pressure at the pressure tap; l ₀ is the distance between the pressure tap and the oil outlet).

Fig. 2 is a structural diagram of the present invention (two-way arrows represent the movement direction of the spool).

Fig. 3 is a schematic diagram of the working process of the present invention (the spool is in the initial position).

Fig. 4 is a schematic diagram of the working process of the present invention (the spool moves to the side of the first oil outlet).

Fig. 5 is a schematic diagram of the working process of the present invention (the spool moves to the side of the second oil outlet).

Detailed ways

Further illustrate the present invention below in conjunction with accompanying drawing

Referring to the attached picture:

Embodiment 1 The two-way proportional pressure regulating mechanism of the present invention includes a fluid laminar flow realization mechanism 1, a first pressure taking point 2, a second pressure taking point 3 and a pressure taking point position adjustment mechanism;

The fluid laminar flow realization mechanism 1 includes a valve core 11 and a valve sleeve 12, the valve sleeve 12 is provided with an oil inlet 121, a first oil outlet 122 and a second oil outlet 123, and the oil inlet 121 is provided with Between the first oil outlet 122 and the second oil outlet 123; the two ends of the valve core 11 are provided with a working step 111 matching the inner diameter of the valve sleeve 12, and the working step 111 of the valve core 11 is The gap 13 between the step and the valve sleeve 12 communicates with the oil inlet 121, the first oil outlet 122 and the second oil outlet 123. The gap 13 is a laminar flow channel, and the fluid flow in the gap 13 presents Laminar flow state, the pressure distribution of the oil inlet 121, the first oil outlet 122, and the second oil outlet 123 presents a stable linear distribution;

Both the first pressure-taking point 2 and the second pressure-taking point 3 are pressure-taking holes that go through the valve sleeve, and the pressure-taking holes communicate with the gap 13, and the first pressure-taking point 2 is set on the Between the first oil outlet 122 and the oil inlet 121, the second pressure point 3 is set between the second oil outlet 123 and the oil inlet 121, and the The distance between the first pressure tapping point 2 and the second pressure tapping point 3 is the same as the length of the valve core 11, and the pressure at the first pressure tapping point 2 and the second pressure tapping point 3 satisfies the following formula:

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Among them, P _a is the pressure at the first pressure-taking point; P _b is the pressure at the second pressure-taking point; P _s is the pressure at the oil inlet; P _o is the pressure at the first oil outlet or the second oil outlet pressure; L ₁ is the distance between the first pressure point and the first oil outlet; L ₂ is the distance between the second pressure point and the second oil outlet; L is the distance between each working step and the valve sleeve The length of the laminar laminar flow channel; and the value range of L ₁ and L ₂ are both 0 ~ L; the value range of P _a and P _b are both P _o ~ P _s ;

The pressure-taking point position adjustment mechanism includes the spool 11 and the pushing part that pushes the spool to move in the valve sleeve. The movement of the spool 11 makes _L1 and _L2 change between 0-L.

The gap 13 can be a slit or an elongated hole and any flow channel that makes the fluid flow appear in a laminar flow state.

The valve core 11 moves along the axial direction of the valve sleeve 12, the gap 13 is distributed in a straight line, and the first oil outlet 122 and the second oil outlet 123 are arranged on the valve core 11. Besides the two ends, the oil inlet 121 is arranged between the two working steps 111 of the valve core 11 .

The working steps 111 at both ends of the spool 11 are distributed symmetrically along the center line of the spool 11 .

The first pressure-taking point 2 and the second pressure-taking point 3 are symmetrically distributed along the center of the valve sleeve 12 .

The working principle of the present invention is: when the valve core 11 slides along the valve sleeve 12 toward the first oil outlet 122, the gap formed between the working step 111 of the valve core 11 near the first oil outlet 122 and the valve sleeve 12 The length of 13 remains the same, but the working step 111 of the spool 11 near the second oil outlet 123 crosses the second pressure taking point 3, so that the distance between the first pressure taking point 2 and the first oil outlet 122 gradually increases, At the same time, the distance between the second pressure-taking point 3 and the second oil outlet 123 is always 0, so that the pressure at the first pressure-taking point 2 gradually increases, while the pressure at the second pressure-taking point 3 remains unchanged. The pressure calculation formula at the first pressure tapping point 2 and the second pressure tapping point 3 shows that the pressure at the first pressure tapping point 2 changes linearly with the distance between the first pressure tapping point 2 and the first oil outlet 122 During the process, the pressure at the second pressure point 3 is equal to the pressure at the second oil outlet 123; on the contrary, when the valve core 11 slides along the valve sleeve 12 to the second oil outlet 123, the pressure close to the second oil outlet The length of the gap 13 formed by the working step 111 of the valve core 11 at the oil port 123 and the valve sleeve 12 remains unchanged, while the working step 111 of the valve core 11 near the first oil outlet 122 crosses the first pressure-taking point 2, so that The distance between the first pressure point 2 and the first oil outlet 122 is always 0, and the distance between the second pressure point 3 and the second oil outlet 123 gradually increases, so that the pressure at the first pressure point 2 is not changed. The pressure at the second pressure-taking point 3 increases gradually. According to the pressure calculation formulas at the first pressure-taking point 2 and the second pressure-taking point 3, it can be known that the pressure at the second pressure-taking point 3 is the same as the second pressure-taking point 3. When the distance between point 3 and the second oil outlet 123 changes linearly, the pressure at the first pressure-taking point 2 is equal to the pressure at the first oil outlet 122, so that during the entire movement process of the spool 11 Realize the steady pressure regulation function of the two-way proportional pressure regulation mechanism.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also extends to the field Equivalent technical means that the skilled person can think of based on the concept of the present invention.

Claims (5)

1. The two-way proportional pressure regulating mechanism is characterized in that it includes a fluid laminar flow realization mechanism, a first pressure taking point, a second pressure taking point and a pressure taking point position adjustment mechanism; The fluid laminar flow realization mechanism includes a valve core and a valve sleeve, the valve sleeve is provided with an oil inlet, a first oil outlet and a second oil outlet, and the oil inlet is arranged at the first oil outlet Between the port and the second oil outlet; the two ends of the valve core are provided with working steps matching the inner diameter of the valve sleeve; the working steps of the valve core and the gap between the valve sleeve are connected to the oil inlet, the first outlet The oil port and the second oil outlet, the gap is a laminar laminar flow channel, the fluid flow in the gap presents a laminar flow state, the oil inlet, the first oil outlet, and the second oil outlet The pressure distribution presents a stable linear distribution; Both the first pressure-taking point and the second pressure-taking point are pressure-taking holes penetrating the valve sleeve, the pressure-taking hole communicates with the gap, and the first pressure-taking point is set at the first oil outlet port and the oil inlet, the second pressure point is set between the second oil outlet and the oil inlet, and the first pressure point and the second The distance between the two pressure tapping points is equal to the length of the spool, and the pressure at the first pressure tapping point and the second pressure tapping point satisfies the following formula: ${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$ ${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$ Among them, P _a is the pressure at the first pressure-taking point; P _b is the pressure at the second pressure-taking point; P _s is the pressure at the oil inlet; P _o is the pressure at the first oil outlet or the second oil outlet pressure; L ₁ is the distance between the first pressure point and the first oil outlet; L ₂ is the distance between the second pressure point and the second oil outlet; L is the distance between each working step and the valve sleeve The length of the laminar flow channel; and the value range of L ₁ and L ₂ are both 0 ~ L; the value range of P _a and P _b are both P _o ~ P _s ; The pressure-taking point position adjustment mechanism includes the spool and the pushing part that pushes the spool to move in the valve sleeve, and the movement of the spool changes _L1 and _L2 between 0-L. 2. The two-way proportional pressure regulating mechanism according to claim 1, characterized in that: the gap can be a slit or an elongated hole, or any flow channel that makes the fluid flow appear as a laminar flow state. 3. The two-way proportional pressure regulating mechanism according to claim 2, characterized in that: the valve core moves along the axial direction of the valve sleeve, the gap is distributed in a straight line, and the first oil outlet and The second oil outlet is arranged outside the two ends of the valve core, and the oil inlet is arranged between two working steps of the valve core. 4. The two-way proportional pressure regulating mechanism according to claim 3, wherein the working steps at both ends of the spool are symmetrically distributed along the center line of the spool. 5. The two-way proportional pressure regulating mechanism according to claim 3, characterized in that: said first pressure-taking point and said second pressure-taking point are symmetrically distributed along the center of the valve sleeve.