CN211117799U

CN211117799U - One-way valve with step-like speed regulation valve core

Info

Publication number: CN211117799U
Application number: CN201921664075.4U
Authority: CN
Inventors: 郭晓春; 李燕闽
Original assignee: Wuxi Hanwei Hydraulic Pneumatic Co ltd
Current assignee: Wuxi Hanwei Hydraulic Pneumatic Co ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-07-28
Anticipated expiration: 2029-09-30

Abstract

The utility model relates to a check valve with class notch cuttype speed governing case, including valve body, left locking lid, right locking lid, choke valve spring, case and first check valve, the case includes interconnect's damping portion and throttle portion, and the damping portion sets up in first intracavity, has first oil guide hole in the damping portion and its one end that is close to left oil guide hole has the damping terminal surface, and the outer circumference of throttle portion is multistage echelonment and its diameter and increases gradually or reduce along the axis direction of keeping away from the damping portion, has multistage circumferential weld clearance between throttle portion and the first chamber. The utility model utilizes the throttle valve spring, the valve core and the first one-way valve in the valve body and the multi-stage annular seam clearance between the throttling part of the valve core and the first cavity of the valve body to ensure that the one-way valve with the step-like speed regulating valve core can be automatically regulated to the corresponding speed according to different pressures; can play the role of an explosion-proof valve; the structure is compact, and the device can be additionally arranged outside the existing product to carry out system upgrading or remanufacturing; no redundant control ports and internal vents are required.

Description

One-way valve with step-like speed regulation valve core

Technical Field

The utility model relates to a sensor protection adjustment mechanism especially relates to a sensor protection adjustment mechanism that is used for automatic drawing-in machine harness wire to deviate from device.

Background

In the fields of engineering machinery and industry, particularly in the fields of cranes, jacks, continuous casting machines, elevators and the like, the piston rod is required to stably and smoothly move when falling back, and particularly an explosion-proof valve is often arranged at an oil port at the end of a rodless cavity, so that accidents caused by the fact that the piston rod is quickly retracted after the pipeline is exploded are avoided.

Under the normal condition, the retraction speed of the oil cylinder depends on the flow control of a system, after an external pipeline fails, the retraction speed depends on the load of a damping hole on an explosion-proof valve and the oil cylinder, the larger the load is, the higher the oil pressure is, the faster the retraction speed is, if the pressure is unstable in the retraction process, the impact vibration can be generated on the oil cylinder, and the flow stability is poor.

In some customization requirements, a customer needs the oil cylinder to have different stable retraction speeds under the condition of different load ranges, and the one-way constant-speed valve previously applied by the applicant cannot change different annular seam clearances under different pressures and cannot obtain corresponding different speeds.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the defect to prior art, provide a can be according to different pressure automatically regulated for the speed that corresponds and can play the check valve that has class notch cuttype speed governing case of the effect of explosion-proof valve.

The utility model discloses a realize through following technical scheme: a check valve with a step-like speed regulation valve core comprises a valve body, a left stop cover and a right stop cover which are arranged at two ends of the valve body, wherein a left oil guide hole and a right oil guide hole are respectively and sequentially arranged on the left stop cover and the right stop cover, the check valve further comprises a throttle valve spring, a valve core and a first check valve, a first cavity and a second cavity which are communicated with the left oil guide hole and the right oil guide hole are sequentially arranged in the valve body along the axial direction of the valve body, the valve core comprises a damping part and a throttling part which are connected with each other, the damping part is arranged in the first cavity, the damping part is internally provided with the first oil guide hole, one end of the first oil guide hole close to the left oil guide hole is provided with a damping end face, the throttling part is provided with one end arranged in the first cavity and the other end arranged in the second cavity, the throttling part is of a multi-stage step shape, the diameter of the throttling part is gradually increased or reduced along, the throttle portion is internally provided with a containing groove communicated with the first oil guide hole, the first one-way valve is arranged in the containing groove, and one end of the throttle valve spring is arranged in the first cavity, and the other end of the throttle valve spring is sleeved on the damping portion.

Further, the throttling part comprises a first throttling core column, a second throttling core column and a third throttling core column which are integrally formed, and the diameter of the first throttling core column is smaller than that of the second throttling core column and smaller than that of the third throttling core column.

Furthermore, one end of the throttling part, which is far away from the damping part, is covered by a valve core cover, a second oil guide hole is formed in the valve core cover, and the accommodating groove is communicated with the right oil guide hole through the second oil guide hole.

Furthermore, the first check valve comprises a steel ball and a check valve spring which are connected with each other, the steel ball is arranged in the accommodating groove and close to one end of the first oil guide hole, and the check valve spring is arranged at the other end far away from the first oil guide hole and abuts against the valve core cover at one end far away from the steel ball.

More specifically, one end of the throttle spring abuts against the left stop cover and the other end of the throttle spring abuts against an end surface of the throttle portion close to the damping portion.

More specifically, the second lumen has an inner diameter greater than the inner diameter of the first lumen.

More specifically, the first cavity comprises a first cavity and a second cavity which are communicated with each other, and the length of the first cavity is larger than that of the second cavity.

The utility model has the advantages that: the utility model utilizes the throttle valve spring, the valve core and the first one-way valve in the valve body and the multi-stage annular seam clearance between the throttling part of the valve core and the first cavity of the valve body to ensure that the one-way valve with the step-like speed regulating valve core can be automatically regulated to the corresponding speed according to different pressures, namely has different stable retraction speeds under the conditions of different load ranges; can play the role of an explosion-proof valve; the structure is compact, and the device can be additionally arranged outside the existing product to carry out system upgrading or remanufacturing; no redundant control ports and internal vents are required.

Drawings

FIG. 1 is a schematic structural diagram of a check valve with a step-like speed regulation valve core;

FIG. 2 is another schematic structural diagram of a check valve with a step-like speed regulation valve core;

FIG. 3 is a flow equation look-up table;

in the figure: 1. a valve body; 11. a valve core cover; 12. a first cavity; 13. a second cavity; 14. a second chamber; 2. A left stop cover; 21. a left oil guide hole; 3. a right stop cover; 31. a right oil guide hole; 4. a throttle spring; 5. A valve core; 51. a damping part; 511. a first oil guide hole; 52. a throttle section; 521. a first throttle leg; 522. A second throttle leg; 523. a third throttle leg; 6. a first check valve; 61. a steel ball; 62. a check valve spring.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be clearly and clearly defined. In the present invention, directional terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc. refer to directions of the attached drawings only. Accordingly, the directional terms used are used for describing and understanding the present invention, and are not used for limiting the present invention.

As shown in fig. 1 and 2, a check valve 5 with a step-like speed regulating valve core comprises a valve body 1, and a left stop cover 2 and a right stop cover 3 disposed at two ends of the valve body 1, wherein the left stop cover 2 and the right stop cover 3 are respectively provided with a left oil guide hole 21 and a right oil guide hole 31 in sequence, and further comprises a throttle spring 4, a valve core 5 and a first check valve 6, the valve body 1 is internally provided with a first cavity and a second cavity 14 which are communicated with the left oil guide hole 21 and the right oil guide hole 31 in sequence along the axial direction thereof, the valve core 5 comprises a damping part 51 and a throttling part 52 which are connected with each other, the damping part 51 is disposed in the first cavity, the damping part 51 is provided with a first oil guide hole 511 therein and a damping end surface at one end thereof close to the left oil guide hole 21, the throttling part 52 is disposed in the first cavity and is disposed in the second cavity 14 at the other end thereof, it should be noted that, in an initial state, the throttle value is 0, one end of the throttle part 5252 close to the damping part 5151 is flush with the right end of the first cavity, the outer circumference of the throttle part 52 is in a multi-step shape, the diameter of the throttle part 52 gradually increases along the axial direction far away from the damping part 51, a multi-stage circumferential seam gap is formed between the throttle part 52 and the first cavity, a containing groove communicated with the first oil guide hole 511 is formed in the throttle part 52, the throttle part 52 comprises a first throttle valve core 5 column, a second throttle valve core 5 column and a third throttle valve core 5 column which are integrally formed, the diameter of the first throttle valve core 5 column is smaller than that of the second throttle valve core 5 column is smaller than that of the third throttle valve core 5 column, the first check valve 6 is arranged in the containing groove, one end of the throttle valve spring 4 is arranged in the first cavity, the other end of the throttle valve spring is sleeved on the damping part 51, further, one end of the throttle part 52 far away from the damping part 51 is covered with a valve core 5 cover 11, and the, the holding tank is communicated with the right oil guide hole 31 through the second oil guide hole, the first check valve 6 comprises a steel ball 61 and a check valve spring 62 which are connected with each other, the steel ball 61 is arranged in the holding tank and is close to one end of the first oil guide hole 511, the check valve spring 62 is arranged at the other end far away from the first oil guide hole 511, one end far away from the steel ball 61 abuts against the valve core 5 cover 11, one end of the throttle valve spring 4 abuts against the left stop cover 2, and the other end abuts against the end face, close to the damping part 51, of the throttling part 52, it should be noted that the throttle valve spring 4 can be an elastic part and is not limited to the throttle valve spring 4, the inner diameter of the second cavity 14 is larger than that of the first cavity, the first cavity comprises a first cavity 12 and a second cavity 13 which are communicated with each other, and the length of the first cavity 12 is larger than that of the second cavity 13.

As shown in fig. 1 to 3, the three conditions of the flow rate passing through the annular gap are generally as shown in fig. 3, and as shown in the structural diagram, the present valve element 5 has a certain guidance, so that the eccentric annular gap is mostly used in the actual use process. The description is analyzed in an ideal state, namely the concentric annular gap condition,

the flow Q can be expressed as:

Δ P-pressure difference, d-nominal diameter of spool 5, clearance (i.e. Ss) between outer diameter of spool 5 and inner hole of valve body 1

L effective damping length mu oil viscosity coefficient

Where (k — spring stiffness), let the back pressure be 0, and Δ P ═ P, the sum can be obtained as follows:

that is, in the adjustable L1, L2, L3 ranges, the flow rate is related to k, independent of the oil pressure P, but because the spool 5 is of a stepped configuration and the clearance between the spool 5 and the valve bore is related to the range of pressure P, the magnitude of pressure P determines the position of the spool 5, the position of the spool 5 determines the L segment corresponding to the circumferential seam, and the different L segments determine the magnitude of the clearance:

when the flow reaches (i.e. P1), the action section of the valve core 5 is L1, and the flow rate is, at this time, the flow gap is SS 1;

when the flow rate is between (i.e., P1) and (i.e., P2), the action section of the valve core 5 is L2, and the flow gap is SS 2;

when the flow rate is between (i.e. P2) and (i.e. P3), the action section of the valve core 5 is L3, the flow rate is the flow gap SS3, and d is the nominal diameter of the valve core 5;

the example is three-stage speed regulation, the speed can be actually divided into more or less stages of stable speed ranges according to the requirements of customers, and the diameters of all the steps can be sequentially increased or sequentially decreased according to the requirements of the customers.

The oil pressure is continuously changed, so when one step is in the throttling hole, the step of the other step can be in the throttling hole at the same time, the flow is calculated in an ideal state in the flow calculation, namely the flow is determined by the minimum throttling gap, and the flow is influenced by each step in practice.

When the oil pressure exceeds the adjusting range, the valve core 5 blocks the oil outlet, and the valve starts the function of the explosion-proof valve.

The working principle is as follows: the left end of the oil circuit of the utility model is connected with the system oil circuit, the right end is connected with the cavity which needs to be adjusted by the oil cylinder, when the oil is supplied to the oil cylinder by the system, the oil pressure passes through the left oil guide hole 21 of the left stop cover 2, sequentially passes through the first cavity 12, the second cavity 13 and the second cavity 14 in the valve body 1, pushes away the steel ball 61 through the first oil guide hole 511 on the valve core 5, and enters the rodless cavity of the oil cylinder from the flow channel of the right stop cover 3 after passing through the second oil guide hole on the cover 11 of the valve core 5, and the; when the oil cylinder lifts heavy objects and needs to descend, oil pressure enters the valve body 1 from the right oil guide hole 31 of the right stop cover 3, because the one-way valve spring 62 and the steel ball 61 in the valve core 5 form the first one-way valve 6, the oil pressure can not pass through the first oil guide hole 511 on the valve core 5, at this time, a multi-stage circumferential seam clearance exists between the outer circle of the throttling part 52 of the valve core 5 and the inner diameter of the second cavity 13, because the outer circumference of the throttling part 52 is in a multi-stage step shape, when one step is in the throttling hole, the step of the previous step can be simultaneously in the throttling hole, in the flow calculation, the ideal state is calculated, namely, the flow is determined by the minimum throttling clearance, therefore, different speeds can be correspondingly adjusted under different pressures, and because the valve core 5 is pressed, the throttling spring 4 is pushed to be compressed until the elastic force of the throttling spring 4 is balanced with, the flow rate is stabilized at the moment, namely the descending speed of the oil cylinder is determined; when the valve core 5 is pushed to the extreme position, the damping end face of the valve core 5 is tightly attached to the left oil guide hole 21, so that the hydraulic medium can only flow over through the plane of the end face of the left oil guide hole 21 and the tightly attached damping part 51, namely, the hydraulic medium flows over through the damping end face.

Compared with the prior art, this utility model can be according to different pressure automatically regulated for the speed that corresponds, under the heavy burden scope condition of difference promptly, have the different stable speed that contracts, can play the effect of explosion-proof valve, compact structure can install additional outside current product, carries out system upgrade or reforms transform.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. The utility model provides a check valve with class notch cuttype speed governing case, includes the valve body and sets up left locking lid and the right locking lid at the valve body both ends, left side locking lid and right locking are covered and are equipped with left side in proper order respectively and lead oilhole and right side and lead oilhole, its characterized in that: the valve also comprises a throttle valve spring, a valve core and a first one-way valve, a first cavity and a second cavity which are communicated with the left oil guide hole and the right oil guide hole are sequentially arranged in the valve body along the axial direction of the valve body, the valve core comprises a damping part and a throttling part which are connected with each other, the damping part is arranged in the first cavity, a first oil guide hole is arranged in the damping part, and a damping end surface is arranged at one end of the damping part close to the left oil guide hole, the throttling part is provided with a plurality of stages of step-shaped outer circumferences, the diameter of the throttling part is gradually increased or decreased along the axial direction far away from the damping part, a plurality of stages of annular seam clearances are arranged between the throttling part and the first cavity, the throttling part is internally provided with an accommodating groove communicated with the first oil guide hole, the first one-way valve is arranged in the accommodating groove, one end of the throttle valve spring is arranged in the first cavity, and the other end of the throttle valve spring is sleeved on the damping portion.

2. The check valve with a step-like speed regulation spool according to claim 1, characterized in that: the throttling part comprises a first throttling valve core column, a second throttling valve core column and a third throttling valve core column which are integrally formed, and the diameter of the first throttling valve core column is smaller than that of the second throttling valve core column and smaller than that of the third throttling valve core column.

3. The check valve with a step-like speed regulation spool according to claim 1, characterized in that: one end of the throttling part, which is far away from the damping part, is covered with a valve core cover, a second oil guide hole is formed in the valve core cover, and the accommodating groove is communicated with the right oil guide hole through the second oil guide hole.

4. A one-way valve having a step-like speed regulation spool as defined in claim 3, wherein: the first check valve comprises a steel ball and a check valve spring which are connected with each other, the steel ball is arranged in the accommodating groove and is close to one end of the first oil guide hole, and the check valve spring is arranged at the other end far away from the first oil guide hole and abuts against the valve core cover at one end far away from the steel ball.

5. The check valve with a step-like speed regulation spool according to claim 1, characterized in that: one end of the throttle valve spring abuts against the left stop cover, and the other end of the throttle valve spring abuts against the end face, close to the damping part, of the throttling part.

6. The check valve with a step-like speed regulation spool according to claim 1, characterized in that: the second lumen has an inner diameter greater than the inner diameter of the first lumen.

7. The check valve with a step-like speed regulation spool according to claim 1, characterized in that: the first cavity comprises a first cavity and a second cavity which are communicated with each other, and the length of the first cavity is larger than that of the second cavity.