CN203189412U - Bi-directional differential ratio pressure adjusting mechanism - Google Patents

Abstract

A bi-directional differential ratio pressure adjusting mechanism comprises a fluid laminar flow achieving mechanism, a first pressure measuring point, a second pressure measuring point and a pressure measuring point position adjusting mechanism. The fluid laminar flow achieving mechanism comprises a valve core and a valve sleeve, wherein an oil inlet, a first oil outlet and a second oil outlet are formed in the valve sleeve, the oil inlet is formed between the first oil outlet and the second oil outlet, the two ends of the valve core are provided with working steps which are matched with the valve sleeve in inner diameter, and a gap between the working steps of the valve core and the valve sleeve is communicated with the oil inlet, the first oil outlet and the second oil outlet. Both the first pressure measuring point and the second pressure measuring point are pressure measuring holes which penetrate through the valve sleeve, and the pressure measuring holes are communicated with the gap. The pressure measuring point position adjusting mechanism comprises the valve core and a pushing part which pushes the valve core to move in the valve sleeve, and L1 and L2 are made to change between 0 and L due to movement of the valve core. The bi-directional differential ratio pressure adjusting mechanism has the advantages that bi-directional differential ratio stable pressure adjusting is achieved through bi-directional rectilinear motion and control flexibility is high.

Description

Two-way differential ratio pressure-regulating device

Technical field

The utility model relates to a kind of two-way differential ratio pressure-regulating device.

Background technique

Proportional pressure control valve often is used as pilot valve to form two-stage or three step valves.Be exactly to be formed by electromagnetic force motor, proportional pressure-reducing valve and hydraulicchange-over valve as electro-hydraulic proportion reversing valve, proportional pressure-reducing valve is here as pilot stage, balance each other with the outlet pressure of its control and the spring force of commutation main valve one end, thus the displacement opening amount of control commutation main valve.The problem that existence control sensitivity is short of to some extent, difficulty of processing is big of existing two-way electro-hydraulic proportion reversing valve.

Summary of the invention

In order to solve present two-way valve control sensitivity shortcoming, the problem of pressure instability, the utility model proposes a kind of two-way differential ratio pressure-regulating device highly sensitive, that pressure regulation stable, difficulty of processing is low of controlling.

The laminar flow that the two-way proportional pressure-regulating device that the utility model proposes adopts fluid to flow is controlled pressure along stroke pressure loss principle, adopts move left and right to realize two-way proportional control.Be the example (see figure 1) with fluid flowing of laminar flow in pipe, as length and the diameter ratio l/d of pipe〉4 the time, be called elongated hole, the mobile Laminar Flow that generally presents of the elongated hole of flowing through according to fluid laminar flow flow formula in ducted stressed and pipe is:

$Q=\frac{\mathrm{\π}{d}^4}{128\mathrm{\μl}}(P_s-P_o)---\left(1\right)$

Wherein, Q is the flow by aperture; D is the pipe diameter; μ is the oil viscosity coefficient; P _sPressure for filler opening; P _oPressure for oil outlet; L is pipe length.

Two-way differential ratio pressure-regulating device described in the utility model is characterized in that: comprise fluid laminar flow realization mechanism, first pressure point, second pressure point and pressure point position adjusting mechanism;

The fluid laminar flow realizes that mechanism comprises spool and valve pocket, and filler opening, first oil outlet and second oil outlet are set on the described valve pocket, and described filler opening is arranged between described first oil outlet and second oil outlet; The working bank of the two ends setting of described spool and the internal diameter coupling of valve pocket; The working bank of described spool and the gap of valve pocket are communicated with filler opening, first oil outlet and second oil outlet, described gap is the laminar flow layer runner, fluid flows and presents laminar flow state in described gap, and the pressure distribution of filler opening and first oil outlet, second oil outlet presents stable linear distribution;

The first pressure point and second pressure point are the pressure-taking hole that runs through valve pocket, described pressure-taking hole is communicated with described gap, described first pressure point is arranged on the pressure regulation laminar flow layer between described first oil outlet and the described filler opening, described second pressure point is arranged on the pressure regulation laminar flow layer between described second oil outlet and the described filler opening, and the distance between the described first pressure point and the second pressure point is less than the length of described spool, greater than the distance between two working banks of spool, the pressure at the first pressure point and second pressure point place satisfies following formula:

$P_a=\frac{L_1}{L}(P_s-P_o)+P_o---\left(2\right)$

$P_b=\frac{L_2}{L}(P_s-P_o)+P_o---\left(3\right)$

Wherein, P _aBe the pressure at first pressure point place; P _bBe the pressure at second pressure point place; P _sPressure for filler opening; P _oBe the pressure of first oil outlet or second oil outlet; L ₁It is the distance between the first pressure point and first oil outlet; L ₂It is the distance between the second pressure point and second oil outlet; L is the length of the laminar flow layer runner of each working bank and valve pocket formation; And L ₁And L ₂Span be 0～L; P _aAnd P _bSpan be P _o～P _s

Pressure point position adjusting mechanism comprises described spool and promotes the push mechanism that spool moves that in described valve pocket the movement of spool makes L ₁And L ₂Between 0-L, change.

Described gap can be slit or elongated hole and make the mobile any runner that is rendered as laminar flow state of fluid.

Described spool moves along the axial direction of valve pocket, described gap linearly direction distributes, and described first oil outlet and second oil outlet are arranged on outside the two ends of described spool, described filler opening is arranged between two working banks of described spool.

The working bank at described spool two ends is symmetrically distributed along the center line of spool.

Working principle of the present utility model is: when spool along valve pocket in the first oil outlet direction sliding process, the gap length that the working bank of spool and valve pocket form is constant, but the distance of first pressure point distance, first oil outlet increases gradually, the distance of second pressure point distance, second oil outlet reduces gradually simultaneously, the pressure at the pressure point place that wins is increased gradually, the pressure at the point of second pressure simultaneously place reduces gradually, according to the calculation of pressure formula at the first pressure point and second pressure point place as can be known: the pressure at first pressure point place is linear with the distance between the first pressure point and first oil outlet, the pressure at second pressure point place is linear with the distance between the second pressure point and second oil outlet, realizes the steady voltage regulation function of two-way differential ratio pressure-regulating device in the movement process of whole spool.

The beneficial effects of the utility model show: pressure-regulating device adopts left and right sides two-way linear motion to realize two-way differential ratio pressure regulation; Pressure regulation is stable; Control highly sensitive; Simple in structure; Difficulty of processing is low.

Description of drawings

Fig. 1 is that (wherein, P is the pressure at pressure tappings place to fluid layer flowing pressure distribution schematic diagram; l ₀Be the distance between pressure tappings and the oil outlet).

Fig. 2 is voltage-regulation principle figure of the present utility model.

Fig. 3 is structural drawing of the present utility model (four-headed arrow represents the valve core movement direction).

Fig. 4 is sectional view of the present utility model.

Fig. 5 is working procedure schematic representation of the present utility model (valve core movement is to first oil outlet, one side).

Fig. 6 is working procedure schematic representation of the present utility model (valve core movement is between first oil outlet and second oil outlet).

Fig. 7 is working procedure schematic representation of the present utility model (valve core movement is to second oil outlet, one side).

Embodiment

Further specify the utility model below in conjunction with accompanying drawing

With reference to accompanying drawing:

Embodiment's 1 two-way differential ratio pressure-regulating device described in the utility model comprises fluid laminar flow realization mechanism 1, the first pressure point 2, the second pressure point 3 and pressure point position adjusting mechanism;

The fluid laminar flow realizes that mechanism 1 comprises spool 11 and valve pocket 12, and filler opening 121, first oil outlet 122 and second oil outlet 123 are set on the described valve pocket 12, and described filler opening 121 is arranged between described first oil outlet 122 and second oil outlet 123; The working bank 111 of the two ends setting of described spool 11 and the internal diameter coupling of valve pocket 12, the gap 13 of the working bank of described spool 11 and valve pocket 12 is communicated with filler opening 121, first oil outlet 122 and second oil outlet 123, described gap 13 is the laminar flow layer runner, fluid flows and presents laminar flow state in described gap 13, and the pressure distribution of filler opening 121 and first oil outlet 122, second oil outlet 123 presents stable linear distribution;

The first pressure point 2 and the second pressure point 3 are the pressure-taking hole that runs through valve pocket, described pressure-taking hole is communicated with described gap 13, the described first pressure point 2 is arranged on the pressure regulation laminar flow layer between described first oil outlet 122 and the described filler opening 121, the described second pressure point 3 is arranged on the pressure regulation laminar flow layer between described second oil outlet 123 and the described filler opening 121, and the distance between the described first pressure point and the second pressure point is less than the length of described spool, greater than the distance between two working banks of spool, the pressure that 3 places are put in the first pressure point 2 and second pressure satisfies following formula:

$P_a=\frac{L_1}{L}(P_s-P_o)+P_o---\left(2\right)$

$P_b=\frac{L_2}{L}(P_s-P_o)+P_o---\left(3\right)$

Wherein, P _aBe the pressure at first pressure point place; P _bBe the pressure at second pressure point place; P _sPressure for filler opening; P _oBe the pressure of first oil outlet or second oil outlet; L ₁It is the distance between the first pressure point and first oil outlet; L ₂It is the distance between the second pressure point and second oil outlet; L is the laminar flow layer runner length that each working bank and valve pocket form; And L ₁And L ₂Span be 0～L; P _aAnd P _bSpan be P _o～P _s

Pressure point position adjusting mechanism comprises described spool 11 and promotes the push mechanism that spool moves that in described valve pocket the movement of spool 11 makes L ₁And L ₂Between 0-L, change.

Described gap 13 can be slit or elongated hole and make the mobile any runner that is rendered as laminar flow state of fluid.

Described spool 11 moves along the axial direction of valve pocket 12, described gap 13 linearly direction distributes, and described first oil outlet 122 and second oil outlet 123 are arranged on outside the two ends of described spool 11, described filler opening 121 is arranged between two working banks 111 of described spool 11.

The working bank 111 at described spool 11 two ends is symmetrically distributed along the center center line of spool 11.

Working principle of the present utility model is: when spool 11 along valve pocket 12 in first oil outlet, 122 direction sliding processes, the working bank 111 of spool 11 is constant with gap 13 length that valve pocket 12 forms, but the distance of the first pressure point, 2 distances, first oil outlet 122 increases gradually, the distance of the second pressure point, 3 distances, second oil outlet 123 reduces gradually, the pressure that makes the pressure of winning put 2 places increases gradually, the pressure that 3 places are put in second pressure reduces gradually, the calculation of pressure formula of putting 3 places according to the first pressure point 2 and second pressure is as can be known: it is linear with the distance between the first pressure point 2 and first oil outlet 122 that the pressure at 2 places is put in first pressure, second pressure is put the pressure at 3 places and is followed the distance between the second pressure point 3 and second oil outlet 123 linear, realizes the steady voltage regulation function of two-way differential ratio pressure-regulating device in the movement process of whole spool 11.

The described content of this specification embodiment only is enumerating the way of realization of model utility design; protection domain of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection domain of the present utility model also reach in those skilled in the art according to the utility model design the equivalent technologies means that can expect.

Claims (4)

1. two-way differential ratio pressure-regulating device is characterized in that: comprise fluid laminar flow realization mechanism, first pressure point, second pressure point and pressure point position adjusting mechanism;

The fluid laminar flow realizes that mechanism comprises spool and valve pocket, and filler opening, first oil outlet and second oil outlet are set on the described valve pocket, and described filler opening is arranged between described first oil outlet and second oil outlet; The working bank of the two ends setting of described spool and the internal diameter coupling of valve pocket; The working bank of described spool and the gap of valve pocket are communicated with filler opening, first oil outlet and second oil outlet, described gap is the laminar flow layer runner, fluid flows and presents laminar flow state in described gap, and the pressure distribution of filler opening and first oil outlet, second oil outlet presents stable linear distribution;

The first pressure point and second pressure point are the pressure-taking hole that runs through valve pocket, described pressure-taking hole is communicated with described gap, described first pressure point is arranged on the pressure regulation laminar flow layer between described first oil outlet and the described filler opening, described second pressure point is arranged on the pressure regulation laminar flow layer between described second oil outlet and the described filler opening, and the distance between the described first pressure point and the second pressure point is less than the length of described spool, greater than the distance between two working banks of spool, the pressure at the first pressure point and second pressure point place satisfies following formula:

$P_a=\frac{L_1}{L}(P_s-P_o)+P_o---\left(2\right)$

$P_b=\frac{L_2}{L}(P_s-P_o)+P_o---\left(3\right)$

Wherein, P _aBe the pressure at first pressure point place; P _bBe the pressure at second pressure point place; P _sPressure for filler opening; P _oBe the pressure of first oil outlet or second oil outlet; L ₁It is the distance between the first pressure point and first oil outlet; L ₂It is the distance between the second pressure point and second oil outlet; L is the length of the laminar flow layer runner of each working bank and valve pocket formation; And L ₁And L ₂Span be 0～L; P _aAnd P _bSpan be P _o～P _s

Pressure point position adjusting mechanism comprises described spool and promotes the push mechanism that spool moves that in described valve pocket the movement of spool makes L ₁And L ₂Between 0-L, change.

2. two-way differential ratio pressure-regulating device as claimed in claim 1 is characterized in that: described gap can be slit or elongated hole and fluid be flowed be rendered as any runner of laminar flow state.

3. two-way differential ratio pressure-regulating device as claimed in claim 2, it is characterized in that: described spool moves along the axial direction of valve pocket, described gap linearly direction distributes, and described first oil outlet and second oil outlet are arranged on outside the two ends of described spool, described filler opening is arranged between two working banks of described spool.

4. two-way differential ratio pressure-regulating device as claimed in claim 3 is characterized in that: the working bank at described spool two ends is symmetrically distributed along the center line of spool.

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