Double-sided film feedback type throttler structure

Abstract

The invention discloses a double-sided film feedback type throttler structure, belongs to the field of hydrostatic pressure supporting, and is particularly suitable for occasions with high requirements on throttling stability and response speed in a hydrostatic pressure rotary table. The throttling device comprises a throttling body, a double-face metal elastic film arranged in the middle of the body, an upper feedback cavity, a lower feedback cavity, a double-concentric-square-shaped pressure reduction oil way and a sealing structure, the two sides of the film are communicated with the upper feedback cavity and the lower feedback cavity respectively, the film deforms bidirectionally under the action of pressure difference, and therefore an upper throttling gap and a lower throttling gap are adjusted. And automatic flow regulation and stable feedback control are realized. The feedback response speed and the system stability are improved through the double-sided structure, the bearing rigidity and the floating precision are remarkably improved, the problems of adjustment lag and insufficient stability of an existing single-sided feedback throttler under high-load and dynamic change working conditions are solved, and the single-sided feedback throttler has the advantages of being compact in structure, easy and convenient to manufacture, high in adaptability and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of liquid static pressure bearing control in precision machinery, and particularly relates to a double-sided thin feedback type throttler structure. BACKGROUND

[0002] The liquid static pressure bearing system is widely applied to the fields of high-precision rotary tables, numerical control machine tools, optical platforms and the like, and the running precision and load capacity thereof mainly depend on the stable regulation ability of a throttler to flow and pressure. The throttlers commonly used in the existing liquid static pressure system include a capillary throttler, a small hole throttler and a slide valve feedback type throttler, but they have great limitations in actual application. The capillary throttler and the small hole throttler are fixed throttlers, which make oil pass through long or small gap oil channels to generate frictional resistance as the oil channel pressure, but the flow channel is thin and narrow, is easy to be blocked and has no self-regulation ability. The slide valve feedback type throttler relies on the movement of a slide valve to play a feedback role, but the slide valve has great inertia and is easy to have overshoot problems in the regulation process.

[0003] The thin film feedback type throttler is a key throttling control element, and the structure of the throttler realizes automatic regulation of a throttling gap through deformation of a metal elastic thin film under the action of a pressure difference, so as to stabilize the bearing oil film thickness and improve the rigidity and dynamic response characteristics of the system. However, the traditional thin film feedback type throttler is usually a single-sided structure, that is, only a feedback chamber is arranged on one side of the thin film, and one-way deformation of the thin film is driven by pressure change on the side. This kind of structure can obtain a certain degree of feedback effect under the conditions of medium and low speed and stability, but cannot solve the problems in the actual application under the conditions of high speed instability and partial load.

[0004] Therefore, we provide a double-sided thin film feedback type throttler structure to solve the above problems. SUMMARY

[0005] The technical problem to be solved by the application is to design a double-sided thin film feedback type throttler structure to solve the common partial load instability phenomenon in actual operation conditions, that is, there is a pressure difference between multiple working oil chambers, so that the static pressure bearing system is unevenly stressed, thereby affecting the precision stability of workpiece positioning and movement.

[0006] To solve the above technical problems, the application is implemented by the following technical scheme.

[0007] The structure of the double-sided film feedback type restrictor comprises a base 1, a double-sided metal elastic film 2, an upper adjusting chamber 3, a lower adjusting chamber 4, an adjusting gasket 5, an upper valve body 6, a first restrictor platform 7, a second restrictor platform 8, an oil inlet 11, an upper oil outlet 12, a lower oil outlet 13 and a restrictor gap 14; the double-sided metal elastic film 2 is located between the upper adjusting chamber 3 and the lower adjusting chamber 4 and is fixed by the adjusting gasket 5; a double-ring-shaped rectangular restrictor cavity composed of a first annular oil channel 9 and a second annular oil channel 10 is arranged between the upper adjusting chamber 3 and the double-sided metal elastic film 2, the restrictor cavity is provided with a restrictor convex platform composed of the first restrictor platform 7 and the second restrictor platform 8, and the first restrictor platform 7 and the second restrictor platform 8 form an annular restrictor gap 14 with the double-sided metal elastic film 2.

[0008] The restrictor gap 14 formed between the first restrictor platform 7, the second restrictor platform 8 and the double-sided metal elastic film 2 realizes the liquid resistance effect of the restrictor; the hydraulic oil with a certain pressure output by a hydraulic station is divided into two paths after entering the oil inlet 11 on the side of the body, and the two paths of hydraulic oil enter the upper adjusting chamber 3 and the lower adjusting chamber 4 respectively; the hydraulic oil first enters the second annular rectangular oil channel 10 of the adjusting chamber and then flows into the first annular rectangular oil channel 9, and then flows out from the upper oil outlet 12 and the lower oil outlet 13 after being restricted by the restrictor gap 14.

[0009] Under the condition of no load, due to the symmetrical effect of the double-sided film feedback type restrictor, the double-sided metal elastic film 2 located between the upper adjusting chamber 3 and the lower adjusting chamber 4 is in a flat state, the pressures of the adjusting chambers on both sides of the double-sided metal elastic film 2 are the same, the annular restrictor gap 14 is the same, and the flow rates of the two adjusting chambers are the same.

[0010] When the working oil cavities connected to the upper oil outlet 12 and the lower oil outlet 13 are unbalancedly stressed, a partial load phenomenon occurs, the pressures of the upper adjusting chamber 3 and the lower adjusting chamber 4 in the restrictor are different, a pressure difference occurs, the double-sided metal elastic film 2 is deformed by bending, and the double-sided metal elastic film 2 bends towards the side with smaller pressure, so that the annular restrictor gap 14 of the adjusting chamber with smaller pressure decreases, that is, the liquid resistance increases, and the pressure of the adjusting chamber with smaller pressure further decreases; at this time, the annular restrictor gap 14 of the adjusting chamber with larger pressure increases, so that the liquid resistance of the adjusting chamber decreases, and the pressure of the adjusting chamber with larger pressure further increases; in this way, the pressure difference resisting the external partial load is further increased, so that the displacement under the action of the partial load is reduced, and the pressure difference on both sides is gradually restored to balance, so that the dynamic response and self-adaptive adjustment of the external load change are realized.

[0011] The double-sided film feedback type throttler adopts symmetrical constant volume chamber structure composed of upper adjusting chamber 3 and lower adjusting chamber 4, and a double ring-shaped rectangular oil channel composed of first ring-shaped oil channel 9 and second ring-shaped oil channel 10 is arranged in the upper adjusting chamber 3 and the lower adjusting chamber 4 to realize pressure regulating function, so as to reduce feedback pressure response time, improve stability under dynamic load condition, and enhance anti-interference ability of the system.

[0012] The present application has the following beneficial effects:

[0013] 1. The present application adopts double-sided symmetrical structure, and the feedback oil cavity and the film arranged symmetrically upwards and downwards, so that the feedback response direction consistency is better, and the adjusting sensitivity and stability are improved.

[0014] 2. The double ring-shaped rectangular oil channel is adopted in the upper and lower feedback oil cavities, controllable pressure drop is generated when the hydraulic oil flows through the oil channel, the size of the rectangular oil channel can be adjusted according to different load conditions, and the feedback sensitivity is enhanced.

[0015] 3. The metal film 65Mn with good linear elasticity and fatigue resistance is adopted, and the adjusting gasket is arranged to control the maximum stroke, so as to enhance the consistency of the service life and the response.

[0016] 4. Compared with the constant flow type throttler, the anti-unbalanced load capacity can be effectively improved, and the throttler is suitable for load change, unbalanced load, frequent start and stop and other conditions. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiment of the present application, the drawings needed to be used for the embodiment description will be simply introduced as follows.

[0018] Figure 1 It is a sectional view of the present application.

[0019] Figure 2 It is an overall structure explosion diagram of the present application.

[0020] Figure 3 It is a local structure perspective view of the present application.

[0021] Figure 4 It is an overall structure perspective view of the present application.

[0022] In the drawings: 1, base, 2, double-sided metal elastic film, 3, upper adjusting chamber, 4, lower adjusting chamber, 5, adjusting gasket, 6, upper valve body, 7, first throttling table, 8, second throttling table, 9 first ring-shaped oil channel, 10, second ring-shaped oil channel, 11, oil inlet, 12, upper oil outlet, 13, lower oil outlet, 14, throttling gap. DETAILED EMBODIMENT

[0023] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

[0024] A double-sided thin film feedback type restrictor structure is shown in Figures 1-4 The double-sided thin film feedback type restrictor structure comprises a base 1, a double-sided metal elastic film 2, an upper adjusting chamber 3, a lower adjusting chamber 4, an adjusting gasket 5, an upper valve body 6, a first restrictor platform 7, a second restrictor platform 8, an oil inlet 11, an upper oil outlet 12, a lower oil outlet 13 and a restrictor gap 14. The double-sided metal elastic film 2 is located between the upper adjusting chamber 3 and the lower adjusting chamber 4 and is fixed by the adjusting gasket 5. A double-ring-shaped rectangular restrictor cavity composed of a first annular oil channel 9 and a second annular oil channel 10 is arranged between the upper adjusting chamber 3 and the double-sided metal elastic film 2. The restrictor cavity is provided with a restrictor protrusion composed of the first restrictor platform 7 and the second restrictor platform 8. The first restrictor platform 7 and the second restrictor platform 8 form the annular restrictor gap 14 with the double-sided metal elastic film 2.

[0025] The restrictor gap 14 formed by the first restrictor platform 7, the second restrictor platform 8 and the double-sided metal elastic film 2 realizes the liquid resistance of the restrictor. The hydraulic oil with a certain pressure output by a hydraulic station is divided into two paths after entering the oil inlet 11 on the side of the body. The two paths of hydraulic oil enter the upper adjusting chamber 3 and the lower adjusting chamber 4 respectively. The hydraulic oil first enters the second annular rectangular oil channel 10 of the adjusting chamber and then flows into the first annular rectangular oil channel 9. After being restricted by the restrictor gap 14, the hydraulic oil flows out from the upper oil outlet 12 and the lower oil outlet 13.

[0026] Under the condition of no load, due to the symmetrical effect of the double-sided thin film feedback type restrictor, the double-sided metal elastic film 2 located between the upper adjusting chamber 3 and the lower adjusting chamber 4 is in a flat state. The pressures of the adjusting chambers on both sides of the double-sided metal elastic film 2 are the same, the annular restrictor gap 14 is the same, and the flow rates of the two adjusting chambers are the same.

[0027] When the working oil cavities connected to the upper oil outlet 12 and the lower oil outlet 13 are unbalancedly stressed, a partial load phenomenon occurs. The pressures of the upper adjusting chamber 3 and the lower adjusting chamber 4 in the restrictor are different, a pressure difference occurs, the double-sided metal elastic film 2 is deformed and bent towards the side with smaller pressure, the annular restrictor gap 14 of the adjusting chamber with smaller pressure decreases, that is, the liquid resistance of the restrictor increases, the pressure of the adjusting chamber with smaller pressure is further reduced, the annular restrictor gap 14 of the adjusting chamber with larger pressure increases, the liquid resistance of the adjusting chamber is reduced, and the pressure of the adjusting chamber with larger pressure is further increased. In this way, the pressure difference resisting the external partial load is further increased, so that the displacement under the action of the partial load is reduced, and the pressure difference on both sides is gradually restored to balance, thereby realizing the dynamic response and self-adaptive adjustment of the external load change.

[0028] The double-sided film feedback throttle adopts a symmetrical constant volume chamber structure composed of an upper adjusting chamber 3 and a lower adjusting chamber 4, and a double-ring rectangular oil channel composed of a first ring oil channel 9 and a second ring oil channel 10 is arranged in the upper adjusting chamber 3 and the lower adjusting chamber 4 to realize pressure regulating, reduce feedback pressure response time, improve stability under dynamic load conditions, and enhance the anti-interference ability of the system.

[0029] The above disclosed preferred embodiments of the present application are only used to help explain the present application, the preferred embodiments do not describe all the details, and the present application is not limited to the specific embodiments described. The embodiments are selected and described in the specification in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application.

Claims

1. A double-sided thin-film feedback restrictor structure, characterized by, The utility model relates to a double -sided metal elastic diaphragm feedback type throttle, including base (1), double -sided metal elastic diaphragm (2), upper adjusting chamber (3), lower adjusting chamber (4), adjusting washer (5), upper valve body (6), first throttle platform (7), second throttle platform (8), oil inlet (11), upper oil outlet (12), lower oil outlet (13) and throttle gap (14), and double -sided elastic metal diaphragm (2) is located between upper adjusting chamber (3) and lower adjusting chamber (4), and is fixed by adjusting washer (5) tightly, and be provided with the double annular matrix throttle cavity that is composed of first annular oil channel (9) and second annular oil channel (10) between upper adjusting chamber (3) and double -sided metal elastic diaphragm (2), and the throttle cavity is provided with the throttle boss that is composed of first throttle platform (7) and second throttle platform (8), and first throttle platform (7) and second throttle platform (8) form annular throttle gap (14) between double -sided metal elastic diaphragm (2).

2. A double-sided film restrictor structure according to claim 1, characterized in that: The throttle liquid resistance effect of the throttle is realized by the throttle gap (14) formed between the first throttle platform (7), the second throttle platform (8) and the double -sided metal elastic diaphragm (2); the hydraulic oil outputted by the hydraulic station at a certain pressure is divided into two paths of hydraulic oil after entering the oil inlet (11) on the side of the body, and the two paths of hydraulic oil enter the upper adjusting chamber (3) and the lower adjusting chamber (4) respectively, and the hydraulic oil first enters the second annular rectangular oil channel (10) of the adjusting chamber, and then flows into the first annular rectangular oil channel (9), and flows out from the upper oil outlet (12) and the lower oil outlet (13) after throttling through the throttle gap (14).

3. The bi-film restrictor structure of claim 1, wherein: Under the condition of no load, due to the symmetrical effect of the double -sided diaphragm feedback type throttle, the double -sided elastic metal diaphragm (2) located in the middle between the upper adjusting chamber (3) and the lower adjusting chamber (4) is in a flat state, the pressures of the adjusting chambers on the two sides of the double -sided elastic metal diaphragm (2) are the same, the annular throttle gap (14) is the same, and the flow rates of the two are the same.

4. The bi-film restrictor structure of claim 1, wherein: When the working oil cavities connected to the upper oil outlet (12) and the lower oil outlet (13) are unbalancedly stressed, the phenomenon of partial load occurs, the pressures of the upper adjusting chamber (3) and the lower adjusting chamber (4) inside the throttle are different, a pressure difference occurs, the double -sided metal elastic diaphragm (2) is deformed by bending, and bends towards the side with smaller pressure, the annular throttle gap (14) of the adjusting chamber with smaller pressure decreases, that is, the liquid resistance of the throttle increases, which promotes the pressure of the adjusting chamber with smaller pressure to be further reduced, the annular throttle gap (14) of the adjusting chamber with larger pressure increases, which makes the liquid resistance of the adjusting chamber to be smaller, and promotes the pressure of the adjusting chamber with larger pressure to be further increased; in this way, the pressure difference resisting the external partial load is further increased, so that the displacement under the action of the partial load is reduced, and the pressure difference on the two sides is gradually restored to balance, so that the dynamic response and self -adaptation adjustment of the external load change are realized.

5. The bi-film restrictor structure of claim 1, wherein: The double-sided film feedback throttle adopts symmetrical constant volume chamber structure composed of upper adjusting chamber (3) and lower adjusting chamber (4), and double ring-shaped rectangular oil channels composed of first ring-shaped oil channel (9) and second ring-shaped oil channel (10) are arranged in the upper adjusting chamber (3) and the lower adjusting chamber (4) to realize pressure regulating function, so as to reduce feedback pressure response time, improve stability under dynamic load condition, and enhance anti-interference ability of the system.

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