CN111441679A - Hydraulic stepless positioner - Google Patents

Abstract

The invention relates to the technical field of hydraulics, in particular to a hydraulic stepless positioner, to solve the technical problems that the existing hydraulic structure cannot be automatically unlocked, cannot be automatically unlocked, and the self-locking force and movement resistance are not ideal. The stage positioner includes a piston substructure floating in the oil cavity; the piston substructure is connected to the end of the piston rod, and includes a valve seat piston, a left spring arranged on the left side of the valve seat piston, and a valve seat piston arranged on the right side. Right spring; left and right springs are naturally compressed. The hydraulic stepless positioner provided by the present invention can effectively adjust the self-locking force Fsr and the movement resistance Fmr.

Description

Hydraulic stepless positioner

technical field

The invention relates to the field of hydraulic technology, in particular to a hydraulic stepless positioner.

Background technique

In the design of many door and window opening and closing systems, it is required that doors and windows can be stopped at any angle, and when starting from a static position, sufficient resistance is required, that is, self-locking force Fsr (anti-wind blowing, anti-gravity load, anti-vibration shock, etc.), open (closed) ) during the movement resistance Fmr is small enough.

However, the existing hydraulic structure cannot realize automatic switching between static and moving states, and the self-locking force and motion resistance are not ideal.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a hydraulic stepless positioner to solve the technical problems that the existing hydraulic structure cannot realize automatic switching between static and moving states, and the self-locking force and motion resistance are not ideal.

In order to solve the above-mentioned technical problems, the technical scheme provided by the present invention is:

A hydraulic stepless positioner, comprising a piston substructure floating in the oil cavity;

The piston substructure is connected to the end of the piston rod, and includes a valve seat piston, a left spring arranged on the left side of the valve seat piston and a right spring arranged on the right side of the valve seat piston;

The left and right springs are naturally compressed.

go a step further,

The piston substructure further includes a left spring seat on the left side of the valve seat piston and a right spring seat on the right side of the valve seat piston;

The left spring is sleeved on the left spring seat, and the right spring is sleeved on the right spring seat.

go a step further,

The left spring seat and the right spring seat both include a head and a handle;

The outer circumference of the head is in contact with the cylinder;

The handle portion extends from the head to the valve seat piston direction to abut against the valve seat piston, and the handle portion has a step structure whose height gradually decreases along the direction toward the valve seat piston, so The left spring and the right spring are both sleeved on the large diameter section of the handle.

go a step further,

The piston substructure further includes a right valve seat sliding sleeve;

the right spring is in contact with the outer side of the right valve seat sliding sleeve;

A first flow port is provided on the right side of the valve seat piston, the first flow port is in communication with the left side of the valve seat piston, and the right valve seat sliding sleeve blocks the first flow port in a natural state;

The gap between the outer circular surface of the valve seat piston and the large inner circular surface of the valve seat sliding sleeve constitutes a first annular gap;

The gap between the small inner circular surface of the valve seat sliding sleeve and the outer sliding sleeve part of the right spring seat constitutes a second annular gap;

The oil in the first annular gap and the second annular gap forms a liquid resistance.

go a step further,

The right valve seat sliding sleeve is sleeved on a partial area of the small diameter section of the handle of the right spring seat, and the right valve seat sliding sleeve has a protrusion extending to the right, and the right spring is sleeved on the Raised position.

go a step further,

The side of the right valve seat sliding sleeve facing the valve seat piston is provided with an annular groove, a right sealing ring is arranged in the annular groove, and the right sealing ring blocks the first flow in a natural state. mouth.

go a step further,

The piston substructure further includes a left valve seat sliding sleeve;

the left spring abuts on the outer side of the left valve seat sliding sleeve;

A second flow port is provided on the left side of the valve seat piston, and the second flow port is connected to the right side of the valve seat piston; the left valve seat sliding sleeve blocks the second flow port in a natural state mouth;

The gap between the outer circular surface of the valve seat piston and the large inner circular surface of the left valve seat sliding sleeve forms a third annular gap,

The gap between the small inner circular surface of the left valve seat sliding sleeve and the part of the left spring seat stem portion extending into the left valve seat sliding sleeve constitutes a fourth annular gap.

go a step further,

The left valve seat sliding sleeve is sleeved on a partial area of the small diameter section of the handle of the left spring seat, and the left valve seat sliding sleeve has a protrusion extending to the left, and the left spring is sleeved on the Raised position.

go a step further,

The side of the left valve seat sliding sleeve facing the valve seat piston is provided with an annular groove, a left sealing ring is arranged in the annular groove, and the left sealing ring blocks the second sealing ring in a natural state. mouth;

go a step further,

An outer sealing mechanism is arranged between the valve seat piston and the cylinder;

An inner sealing mechanism is arranged between the valve seat piston and the piston rod.

The following briefly describes at least the technical effects that the hydraulic stepless positioner provided by the present invention can achieve:

The hydraulic stepless positioner provided by the present invention includes a piston substructure floating in the oil cavity, and the piston substructure includes a valve seat piston, a left spring arranged on the left side of the valve seat piston, and a left spring arranged on the right side of the valve seat piston. The right spring, left spring and right spring are in a compressed state in a natural state, that is, in a natural state, the left spring exerts a rightward elastic force directed toward the seat piston, and the right spring exerts a leftward force directed toward the seat piston. Elasticity.

When the axial pressure force or thrust applied to the end of the piston rod causes the pressure of the oil chamber on the left side of the valve seat piston or the pressure in the oil chamber on the right side of the valve seat to increase, but it is not enough to overcome the spring force, the piston rod cannot move, and it acts on the valve seat at this time. The difference between the hydraulic pressure on the left and right ends of the piston is the self-locking force Fsr; on the contrary, when the axial pressure force or thrust applied to the end of the piston rod causes the pressure of the left oil chamber or the right oil chamber of the valve seat piston to increase, it is enough to overcome the With spring force, the piston rod can be compressed to the left or extended to the right.

It can be seen from the above analysis that the axial pressure force or thrust applied to the end of the piston rod needs to overcome the spring force first, that is to say, the spring effectively increases the self-locking force Fsr.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a schematic diagram of the overall structure of a hydraulic stepless positioner provided by an embodiment of the present invention;

2 is a schematic diagram of a piston substructure in a hydraulic stepless positioner provided by an embodiment of the present invention;

3 is a schematic diagram of the positions of the first annular gap, the second annular gap, the third annular gap and the fourth annular gap in the piston substructure of the hydraulic stepless positioner according to the embodiment of the present invention.

Icon: 100-piston substructure; 110-seat piston; 120-left spring; 130-right spring; 140-left spring seat; 150-right spring seat; 160-left seat slide; 170-right seat slide sleeve; 101-left sealing ring; 102-right sealing ring; 103-outer sealing ring; 104-inner sealing ring. 200-cylinder; 300-piston rod; 400-isolating piston; 500-guide sealing mechanism; 001-first flow port; 002-second flow port; Gap1-first annular gap; Gap2-second annular gap; Gap3- The third annular gap; Gap4 - the fourth annular gap.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "left", "right" and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Embodiment 1 is described in detail below in conjunction with Fig. 1, Fig. 2 and Fig. 3:

This embodiment provides a hydraulic stepless positioner,

The hydraulic stepless positioner includes a cylinder barrel 200, and an isolation piston 400 is arranged in the cylinder barrel 200. The isolation piston 400 divides the inner cavity of the cylinder barrel 200 into an air cavity and an oil cavity, and the piston rod 300 protrudes from the end of the oil cavity. Inside the oil cavity, and at the end of the oil cavity located in the oil cavity, a guide sealing mechanism 500 sleeved on the piston rod 300 is provided.

The hydraulic stepless positioner also includes a piston substructure 100 floating in the oil cavity. The shape and structure of the piston substructure 100 are described in detail below:

The piston substructure 100 is connected to the end of the piston rod 300 and includes a valve seat piston 110, a left spring 120 arranged on the left side of the valve seat piston 110 and a right spring 130 arranged on the right side of the valve seat piston 110;

The left spring 120 and the right spring 130 are in a compressed state in a natural state. That is, in a natural state, the left spring 120 exerts a rightward elastic force directed toward the valve seat piston 110 , and the right spring 130 exerts a leftward elastic force directed toward the valve seat piston 110 .

When the axial pressure force or thrust applied to the end of the piston rod 300 causes the pressure of the left oil chamber or the right oil chamber of the valve seat piston 110 to increase, but it is not enough to overcome the spring force, the piston rod 300 cannot move. The difference between the hydraulic pressures on the left and right ends of the valve seat piston 110 is the self-locking force Fsr; on the contrary, when the axial pressure force or thrust applied to the end of the piston rod 300 causes the pressure in the left oil chamber of the valve seat piston 110 or the oil chamber on the right side When the pressure rises enough to overcome the spring force, the piston rod 300 can compress to the left or extend to the right. It can be seen from the above analysis that the axial pressure force or thrust applied to the end of the piston rod 300 needs to overcome the spring force first, that is to say, the spring effectively increases the self-locking force Fsr.

In the optional solution of this embodiment, more preferably,

The piston substructure 100 further includes a right spring seat 150 and a right valve seat sliding sleeve 170;

The right spring seat 150 is sleeved on the piston rod 300 and is located on the right side of the valve seat piston 110; the right spring seat 150 includes a head and a handle, the outer circumference of the head is in contact with the cylinder 200; the handle is from the head to the valve seat piston 110 The direction extends to abut against the valve seat piston 110 , and the handle portion has a step structure with a height gradually decreasing along the direction toward the valve seat piston 110 , and the right spring 130 is sleeved on the large diameter section of the handle portion.

The right valve seat sliding sleeve 170 is fitted over a part of the small diameter section of the handle of the right spring seat 150 , and the right valve seat sliding sleeve 170 has a protrusion extending to the right, and the right spring 130 is fitted in the convex position.

The side of the right valve seat sliding sleeve 170 facing the valve seat piston 110 is provided with an annular groove, and a right sealing ring 102 is arranged in the annular groove. The right sealing ring 102 blocks the first flow port 001 in a natural state.

In the optional solution of this embodiment, more preferably,

The piston substructure 100 further includes a left spring seat 140 and a left valve seat sliding sleeve 160;

The left spring seat 140 is sleeved on the piston rod 300 and is located on the left side of the valve seat piston 110;

The left spring seat 140 includes a head and a handle, and the outer circumference of the head is in contact with the cylinder 200; The direction height of the piston 110 is gradually reduced in a stepped structure, and the left spring 120 is sleeved on the large diameter section of the handle.

The left valve seat sliding sleeve 160 is sleeved on a part of the small diameter section of the handle of the left spring seat 140 , and the left valve seat sleeve 160 has a protrusion extending to the left, and the left spring 120 is sleeved in the protrusion position.

The side of the left valve seat sliding sleeve 160 facing the valve seat piston 110 is provided with an annular groove, and a left sealing ring 101 is arranged in the annular groove. The left sealing ring 101 blocks the second flow port 002 in a natural state.

In the optional solution of this embodiment, more preferably,

A first flow port 001 is provided on the right side of the valve seat piston 110, the first flow port 001 is connected to the left side of the valve seat piston 110, and the right valve seat sliding sleeve 170 blocks the first flow port 001 in a natural state; The gap between the circular surface and the large inner circular surface of the valve seat sliding sleeve constitutes the first annular gap Gap1; the gap between the small inner circular surface of the valve seat sliding sleeve and the outer sliding sleeve part of the right spring seat 150 constitutes the second annular gap Gap2; The oil in the first annular gap Gap1 and the second annular gap Gap2 forms a liquid resistance.

A second flow port 002 is provided on the left side of the valve seat piston 110, and the second flow port 002 is connected to the right side of the valve seat piston 110; the left valve seat sliding sleeve 160 blocks the second flow port 002 in a natural state; the valve seat The gap between the outer circular surface of the piston 110 and the large inner circular surface of the left valve seat sliding sleeve 160 constitutes the third annular gap Gap3, and the small inner circular surface of the left valve seat sliding sleeve 160 and the rod of the left spring seat 140 protrude into the left valve seat The gap between the parts of the sliding sleeve 160 constitutes the fourth annular gap Gap4.

In the optional solution of this embodiment, more preferably,

An outer sealing mechanism is arranged between the valve seat piston 110 and the cylinder barrel 200; specifically, a groove is provided on the outer peripheral surface of the valve seat piston 110, and an outer sealing ring 103 is arranged in the groove, and the outer sealing ring 103 forms an outer sealing ring. Sealed structure.

In the optional solution of this embodiment, more preferably,

An inner sealing mechanism is provided between the valve seat piston 110 and the piston rod 300 . Specifically, a groove is provided on the inner surface of the valve seat piston 110, and an inner sealing ring 104 is arranged in the groove, and the inner sealing ring 104 abuts against the piston rod 300 to form an inner sealing mechanism.

The realization principle of the motion resistance Fmr during the opening (closing) process is described in detail as follows:

When the oil pressure on the left side of the valve seat piston 110 overcomes the spring force of the right spring 130 and pushes open the right sealing ring 102, the oil on the left side of the valve seat piston 110 flows through the first flow port 001 in two parts and flows to the right through the two annular gaps The cavity on the right side of the valve seat sliding sleeve 170, the gap between the outer circular surface of the valve seat piston 110 and the large inner circular surface of the valve seat sliding sleeve constitutes the first annular gap Gap1; the small inner circular surface of the valve seat sliding sleeve and the right spring seat 150 The gap between the outer sliding sleeve parts constitutes the second annular gap Gap2; these two gaps form a liquid resistance, the oil pressure on the left side of the valve seat sliding sleeve is greater than the oil pressure on the right side of the valve seat sliding sleeve, and the oil on the left side of the valve seat sliding sleeve The hydraulic pressure is greater than the spring force acting on the right end surface of the valve seat sliding sleeve, the valve seat sliding sleeve slides to the right, the liquid resistance decreases, and finally the oil pressure on the left side of the valve seat sliding sleeve and the force acting on the right end surface of the valve seat sliding sleeve The spring force is balanced, and the force acting on the piston substructure 100 is the sum of the hydraulic force acting on the valve seat piston 110 and the spring force exerted by the right spring 130 on the right spring seat. This is the compression motion resistance Fmr.

When the oil pressure on the right side of the valve seat piston 110 overcomes the spring force of the second spring and pushes open the left sealing ring 101, the oil on the left side of the valve seat piston 110 flows through the second orifice 002 and then passes through the two annular gaps in two parts Flow to the left cavity of the left valve seat sliding sleeve 160, the gap between the outer circular surface of the valve seat piston 110 and the large inner circular surface of the left valve seat sliding sleeve 160 constitutes the third annular gap Gap3, the small inner circular surface of the left valve seat sliding sleeve 160 and the The gap between the part of the rod of the left spring seat 140 extending into the sliding sleeve 160 of the left valve seat constitutes a fourth annular gap. These two gaps form a liquid resistance, the oil pressure on the right side of the valve seat sliding sleeve is greater than the oil pressure on the left side of the valve seat sliding sleeve, and the oil pressure on the right side of the valve seat sliding sleeve is greater than the spring force acting on the left end face of the valve seat sliding sleeve , the valve seat sliding sleeve slides to the left, the liquid resistance is reduced, and finally the oil pressure on the right side of the valve seat sliding sleeve is balanced with the spring force acting on the left end surface of the valve seat sliding sleeve. At this time, the effect acting on the piston substructure 100 The force is the difference between the spring force exerted by the second spring on the left spring seat 140 and the hydraulic force acting on the valve seat piston 110 , which is the compression motion resistance Fmr.

In addition, it needs to be explained that:

First, the pressure of the left air chamber provides the hydraulic force acting on the piston rod 300 when the piston rod 300 is compressed;

Second, the size of the spring force, the ratio of the end face area of the valve seat piston 110 to the raised orifice area, determines the size of the self-locking force Fsr;

Third, the gap and length of each annular gap and the size of the spring force determine the size of the motion resistance Fmr.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (10)

1. a hydraulic stepless positioner, is characterized in that, comprises the piston substructure floating and arranged in the oil cavity; The piston substructure is connected to the end of the piston rod, and includes a valve seat piston, a left spring arranged on the left side of the valve seat piston and a right spring arranged on the right side of the valve seat piston; The left and right springs are naturally compressed. 2. The hydraulic stepless positioner according to claim 1, characterized in that, The piston substructure further includes a left spring seat on the left side of the valve seat piston and a right spring seat on the right side of the valve seat piston; The left spring is sleeved on the left spring seat, and the right spring is sleeved on the right spring seat. 3. The hydraulic stepless positioner according to claim 2, characterized in that, The left spring seat and the right spring seat both include a head and a handle; The outer circumference of the head is in contact with the cylinder; The handle portion extends from the head to the valve seat piston direction to abut against the valve seat piston, and the handle portion has a step structure whose height gradually decreases along the direction toward the valve seat piston, so The left spring and the right spring are both sleeved on the large diameter section of the handle. 4. The hydraulic stepless positioner according to claim 3, characterized in that, The piston substructure further includes a right valve seat sliding sleeve; the right spring is in contact with the outer side of the right valve seat sliding sleeve; A first flow port is provided on the right side of the valve seat piston, the first flow port is in communication with the left side of the valve seat piston, and the right valve seat sliding sleeve blocks the first flow port in a natural state; The gap between the outer circular surface of the valve seat piston and the large inner circular surface of the valve seat sliding sleeve constitutes a first annular gap; The gap between the small inner circular surface of the valve seat sliding sleeve and the outer sliding sleeve part of the right spring seat constitutes a second annular gap; The oil in the first annular gap and the second annular gap forms a liquid resistance. 5. The hydraulic stepless positioner according to claim 4, characterized in that, The right valve seat sliding sleeve is sleeved on a partial area of the small diameter section of the handle of the right spring seat, and the right valve seat sliding sleeve has a protrusion extending to the right, and the right spring is sleeved on the Raised. 6. The hydraulic stepless positioner according to claim 5, characterized in that, The side of the right valve seat sliding sleeve facing the valve seat piston is provided with an annular groove, a right sealing ring is arranged in the annular groove, and the right sealing ring blocks the first flow in a natural state. mouth. 7. The hydraulic stepless positioner according to claim 6, characterized in that, The piston substructure further includes a left valve seat sliding sleeve; the left spring abuts on the outer side of the left valve seat sliding sleeve; A second flow port is provided on the left side of the valve seat piston, and the second flow port is connected to the right side of the valve seat piston; the left valve seat sliding sleeve blocks the second flow port in a natural state mouth; The gap between the outer circular surface of the valve seat piston and the large inner circular surface of the left valve seat sliding sleeve constitutes a third annular gap, The gap between the small inner circular surface of the left valve seat sliding sleeve and the part of the left spring seat stem portion extending into the left valve seat sliding sleeve constitutes a fourth annular gap. 8. The hydraulic stepless positioner according to claim 7, characterized in that, The left valve seat sliding sleeve is sleeved on a partial area of the small diameter section of the handle of the left spring seat, and the left valve seat sliding sleeve has a protrusion extending to the left, and the left spring is sleeved on the Raised. 9. The hydraulic stepless positioner according to claim 8, characterized in that, The side of the left valve seat sliding sleeve facing the valve seat piston is provided with an annular groove, a left sealing ring is arranged in the annular groove, and the left sealing ring blocks the second sealing ring in a natural state. Mouth. 10. The hydraulic stepless positioner according to any one of claims 1-9, characterized in that, An outer sealing mechanism is arranged between the valve seat piston and the cylinder; An inner sealing mechanism is arranged between the valve seat piston and the piston rod.

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