CN110594218B - Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure - Google Patents
Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure Download PDFInfo
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- CN110594218B CN110594218B CN201910634257.5A CN201910634257A CN110594218B CN 110594218 B CN110594218 B CN 110594218B CN 201910634257 A CN201910634257 A CN 201910634257A CN 110594218 B CN110594218 B CN 110594218B
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- valve
- diversion hole
- valve body
- expansion
- hydraulic
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- 238000007789 sealing Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 10
- 210000004907 gland Anatomy 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000003921 oil Substances 0.000 claims description 19
- 239000010720 hydraulic oil Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 7
- 238000003754 machining Methods 0.000 description 9
- 238000004904 shortening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/04—Check valves with guided rigid valve members shaped as balls
- F16K15/042—Check valves with guided rigid valve members shaped as balls with a plurality of balls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/04—Check valves with guided rigid valve members shaped as balls
- F16K15/044—Check valves with guided rigid valve members shaped as balls spring-loaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0245—Construction of housing; Use of materials therefor of lift valves with ball-shaped valve members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Check Valves (AREA)
Abstract
The invention relates to an expansion valve core, a hydraulic lock structure with the expansion valve core and a sealing method thereof, comprising a valve body, an expansion sleeve, a sealing ring, a gland and a first one-way valve, wherein one end of the valve body is axially provided with a first diversion hole, a containing cavity and a runner are arranged in the valve body and are mutually communicated, the expansion sleeve is sleeved on the periphery of the valve body, the inner wall of the expansion sleeve is communicated with the containing cavity through the runner, the sealing ring is arranged between the expansion sleeve and the valve body, the gland is arranged at one end of the valve body far away from the first diversion hole, the gland is provided with a second diversion hole corresponding to the first diversion hole, and the first one-way valve is arranged in the containing cavity and is respectively connected with the first diversion hole and the second diversion hole. The fit clearance is affected by oil pressure, the larger the oil pressure is, the larger the expansion amount of the expansion sleeve is, and the smaller the clearance between valve holes of the expansion valve core is, so that the speed increase of the leakage amount is slowed down or increased reversely, the installation space is saved, the processing error is reduced, and the precision requirement of processing equipment is reduced.
Description
Technical Field
The present invention relates to a valve core for a hydraulic cylinder, and more particularly, to an expansion valve core, a hydraulic lock structure having the same, and a sealing method thereof.
Background
Valve spools are commonly used in a variety of hydraulic components, one of the necessary hydraulic parts. There are two common conventional valve element sealing modes: the contact type seal and the gap seal, the contact type seal can lead the valve core to achieve zero leakage through the sealing element, but the contact type seal cannot be used by the too small valve core due to the space limitation required by the installation of the sealing element; the contact type seal can generate friction force and is influenced by the cleanliness of oil, so that the service life of the contact type seal is greatly shortened; the clearance type seal meets the operating condition using requirement through reasonable fit clearance and enough throttling length. The clearance type sealed valve core and valve hole require high processing precision and assembly requirements; the gap seal always has leakage and is influenced by various factors such as the temperature of the system, the viscosity of the oil liquid and the like.
Therefore, there is an urgent need for a valve core and a hydraulic valve sealing method that increase the leakage rate and increase the oil pressure inversely, save installation space, reduce machining errors, and reduce the accuracy of machining equipment.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides an expansion valve core, a hydraulic lock structure with the expansion valve core and a sealing method thereof, wherein the expansion amount of the expansion sleeve is larger as the oil pressure is larger, the gap between valve holes of the valve core is smaller, the increasing speed of the leakage amount of the valve core is reduced or is inversely increased, the installation space is saved, the machining error is reduced, and the precision requirement of machining equipment is reduced.
The invention is realized by the following technical scheme: the utility model provides an expansion valve core, includes valve body, inflation cover, sealing washer, gland and first check valve, valve body one end is equipped with first water conservancy diversion hole and has the chamber and the runner that hold that communicate each other in the valve body along its axial, the inflation cover cup joints at valve body periphery and inflation cover inner wall and holds the chamber intercommunication through the runner, the sealing washer sets up between inflation cover and valve body, the gland is installed and is kept away from the second water conservancy diversion hole that corresponds with first water conservancy diversion hole on the one end and the gland of first water conservancy diversion hole of valve body, first check valve sets up and holds the intracavity and be connected with first water conservancy diversion hole and second water conservancy diversion hole respectively.
In order to facilitate strengthening the leakproofness of inflation cover, the valve body has annular hydraulic pressure chamber and the annular mounting groove that link up each other, annular mounting groove sets up in the valve body and the cover is located and is held the chamber outside, and annular hydraulic pressure intracavity wall passes through the runner and holds the chamber intercommunication, annular mounting groove sets up on the valve body outer peripheral face and is used for installing the inflation cover.
The sealing performance of the expansion sleeve is further convenient to strengthen, and the length of the annular hydraulic cavity along the axial direction of the valve body is smaller than that of the annular mounting groove along the axial direction of the valve body.
In order to be convenient for stop the hydraulic oil in the annular hydraulic pressure chamber and flow out of the valve body from the expansion shell, be equipped with two annular seal grooves that are used for installing the sealing washer on the valve body and annular seal groove are located annular hydraulic pressure chamber's both sides respectively.
For sealing, the first one-way valve comprises a first spring and first steel balls connected to two ends of the first spring.
In order to facilitate installation, one side of the gland close to the valve body is provided with a spacer bush, and the gland is connected with the valve body through the spacer bush.
The utility model provides a have hydraulic lock of expansion valve case, includes valve piece and expansion valve case, be equipped with in the valve piece along its axial setting gradually and link up each other first inner chamber, second inner chamber and third inner chamber, have third water conservancy diversion hole and fourth water conservancy diversion hole respectively in first inner chamber and the third inner chamber, be equipped with the second check valve that is used for controlling third water conservancy diversion hole and be equipped with the third check valve that is used for controlling fourth water conservancy diversion hole in the second inner chamber, the expansion valve case sets up in the third inner chamber, third inner chamber both ends lateral wall is equipped with fifth water conservancy diversion hole and sixth water conservancy diversion hole respectively, fifth water conservancy diversion hole with sixth water conservancy diversion hole is located expansion valve case both sides respectively.
In order to facilitate self-locking and sealing, the third diversion hole is communicated with a rod cavity of the hydraulic cylinder, and the fourth diversion hole is communicated with a rodless cavity of the hydraulic cylinder.
A hydraulic valve sealing method employing an expansion valve core, comprising the steps of: firstly, placing an expansion valve core into a valve block, and opening a first one-way valve when oil pressure is arranged on the left side of the expansion valve core, wherein hydraulic oil flows in from a first diversion hole; and the second step, when the first steel ball moves to the flow passage, hydraulic oil in the accommodating cavity enters the annular hydraulic cavity from the flow passage, the sealing ring blocks the hydraulic oil in the annular hydraulic cavity from flowing out of the expansion valve core from the expansion sleeve, and simultaneously, under the action of pressure, the expansion sleeve expands to seal the valve block, and the right one-way valve seals and blocks the hydraulic oil in the accommodating cavity from entering the second diversion hole.
The invention has the beneficial effects that:
The fit clearance is affected by oil pressure, the larger the oil pressure is, the larger the expansion amount of the expansion sleeve is, the smaller the clearance between valve holes of the expansion valve core is, the speed of leakage amount is slowed down or increased reversely, namely, the larger the pressure is, the smaller the leakage is, and the result is that the wall thickness of a sleeve of the expansion sleeve is related;
the same leakage amount can be used for shortening the length of the expansion valve core, so that the installation space is saved, the machining error is reduced, and the precision requirement of machining equipment is lowered.
Drawings
FIG. 1 is a schematic illustration of the structure of an expansion valve core;
FIG. 2 is a schematic illustration of a hydraulic lock configuration having an expansion spool;
FIG. 3 is a diagram of a hydraulic lock structure with an expansion valve core in use with a cylinder;
In the figure: 1. a valve body; 11. a first deflector aperture; 12. a receiving chamber; 13. a flow passage; 14. an annular hydraulic chamber; 15. an annular mounting groove; 16. an annular seal groove; 2. an expansion sleeve; 3. a seal ring; 4. a gland; 41. a second diversion 15 hole; 42. a spacer bush; 5. a first one-way valve; 51. a first spring; 52. a first steel ball; 6. a valve block; 61. a first lumen; 62. a second lumen; 63. a third lumen; 64. a third deflector aperture; 65. a fourth deflector aperture; 66. a second one-way valve; 67. a fifth deflector hole; 68. a sixth deflector hole; 69. a third one-way valve; 7. a hydraulic cylinder; 71. a rod cavity is arranged; 72. a rodless cavity.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention. The directional terms referred to in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., refer only to the directions of the attached drawings. Accordingly, directional terminology is used to describe and understand the invention and is not limiting of the invention.
As shown in fig. 1-3, an expansion valve core comprises a valve body 1, an expansion sleeve 2, a sealing ring 3, a gland 4 and a first check valve 5, wherein one end of the valve body 1 is provided with a first diversion hole 1511 along the axial direction of the valve body, an accommodating cavity 12 and a flow channel 13 which are communicated with each other are arranged in the valve body 1, the expansion sleeve 2 is sleeved on the periphery of the valve body 1, the inner wall of the expansion sleeve 2 is communicated with the accommodating cavity 12 through the flow channel 13, the sealing ring 3 is arranged between the expansion sleeve 2 and the valve body 1, the gland 4 is arranged at one end, far away from the first diversion hole 1511, of the valve body 1, on the gland 4, and is provided with a second diversion 41 hole 15 corresponding to the first diversion hole 1511, the first check valve 5 is arranged in the accommodating cavity 12 and is respectively connected with the first diversion hole 1511 and the second diversion 41 hole 15, the valve body 1 is provided with an annular hydraulic cavity 14 and an annular mounting groove 15 which are communicated with each other, the annular mounting groove 15 is arranged in the valve body 1 and is sleeved outside the accommodating cavity 12, the inner wall of the annular hydraulic cavity 14 is communicated with the accommodating cavity 12 through the flow channel 13, the annular mounting groove 15 is arranged on the annular mounting groove 1, the annular mounting groove 1 and is arranged on the periphery of the valve body 1 and is provided with the annular mounting groove 1, and is arranged on the two sides of the valve body 1 and is provided with the annular groove 1 and the annular groove 15, which is respectively, and is connected with the annular groove 1 and the second diversion sleeve 15 through the second diversion sleeve 15, the axial groove 1 and the valve body 1 through the valve body 1 and the valve body 1, the valve body 1 and the valve body 1 through the valve 1.
The hydraulic lock with the expansion valve core comprises a valve block 6 and the expansion valve core, wherein a first inner cavity 61, a second inner cavity 62 and a third inner cavity 63 which are sequentially arranged along the axial direction of the valve block 6 and mutually communicated are arranged in the valve block 6, a third diversion hole 6415 and a fourth diversion hole 6515 are respectively arranged in the first inner cavity 61 and the third inner cavity 63, a second check valve 66 for controlling the third diversion hole 6415 is arranged in the first inner cavity 61, a third check valve 69 for controlling the fourth diversion hole 6515 is arranged in the second inner cavity 62, the expansion valve core is arranged in the third inner cavity 63, a fifth diversion hole 6715 and a sixth diversion hole 6815 are respectively arranged on the side walls of two ends of the third inner cavity 63, the fifth diversion hole 6715 and the sixth diversion hole 6815 are respectively arranged on two sides of the expansion valve core, in order to facilitate self-locking and sealing, the third diversion hole 6415 is communicated with a rod cavity 71 of a hydraulic cylinder 7, and the fourth diversion hole 6515 is communicated with a rodless cavity 72 of the hydraulic cylinder 7.
A hydraulic valve sealing method employing an expansion valve core, comprising the steps of: first, the expansion valve core is put into the valve block 6, when the left side of the expansion valve core has oil pressure, the first one-way valve 5 is opened, and hydraulic oil flows in from the first diversion hole 1511; in the second step, after the first steel ball 52 moves to the flow channel 13, the hydraulic oil in the accommodating cavity 12 enters the annular hydraulic cavity 14 from the flow channel 13, the sealing ring 3 blocks the hydraulic oil in the annular hydraulic cavity 14 from flowing out of the expansion valve core from the expansion sleeve 2, and meanwhile, under the pressure action, the expansion sleeve 2 expands to seal the valve block 6, and the right one-way valve seals and blocks the hydraulic oil in the accommodating cavity 12 from entering the second diversion 41 hole 15.
The rod cavity 71 of the hydraulic cylinder 7 is connected with the port A, the rodless cavity 72 is connected with the port B, when oil pressure enters from the port P, the second check valve 66 on the left side is pushed open to enter the rod cavity 71 of the hydraulic cylinder, meanwhile, the oil pressure pushes the expansion valve core to the right side, the third check valve 69 on the right side is pushed open, oil in the rodless cavity 72 can flow back to the oil tank from the oil path on the right side, in order to avoid that the oil pressure reaches the right side from the left side of the valve hole 15 through a gap, a sufficient length L and a gap Ss as small as possible are needed, the traditional expansion valve core L and Ss are invariable, and the leakage amount is caused by factors such as machining errors, movement wear and the like, and the leakage amount is possibly increased gradually.
It should be noted that, the theoretical calculation of the flow refers to the form in the following table, and the ideal state is concentric circular seam, but because of the actual situation, the valve core does not operate vertically, and the maximum eccentric circular seam is in a majority state: maximum eccentric annular gapThe invention is explained in principle in an ideal state, namely concentric circular seams: concentric ring gap flow
After the expansion valve core is applied, the oil pressure P pushes the first one-way valve 5 at the left side in the expansion valve core, so that the expansion sleeve 2 on the expansion valve core expands, and Ss is further reduced, namely, ss changes along with pressure changes. The leakage rate of the expansion valve core is as follows: leakage amount
The leakage rate is in direct proportion to the pressure, the diameter of the expansion valve core and the gap, and the leakage rate is in inverse proportion to the length and the viscosity coefficient;
the diameter change of the expansion sleeve 2 after being pressed is as follows: expansion diameter variation
The diameter variation of the expansion sleeve 2 is in direct proportion to the pressure;
Since the left pressure of the expansion valve body is P and the right pressure is 0 (the oil receiving tank), the pressure outside the right side of the expansion valve body decreases with the increase of the length L, and the pressure inside the expansion sleeve 2 is always P, so that the expansion amount increases as the pressure difference increases on the right side of the expansion sleeve 2, the smaller the gap between the outside and the valve hole 15 becomes, and the more the throttling effect becomes apparent.
The thickness of the expansion sleeve 2 needs to meet the wall thickness checking calculation:
delta is the wall thickness, D is the inner diameter of the expansion sleeve 2, and Pmax is the maximum pressure;
it is necessary to simultaneously satisfy that the expansion shell 2 does not undergo plastic deformation at the maximum impact pressure:
Pn is the use pressure, ppl is the plastic deformation pressure, D1 is the outer diameter of the expansion sleeve 2, and D is the inner diameter of the expansion sleeve 2;
Through the formula, the expansion valve core with the structure can be compared, under the condition of the same length and the same initial clearance Ss, the internal leakage generated on the expansion valve core is effectively reduced along with the increase of the pressure, the performance of the expansion valve core for improving the sealing (throttling) is increased along with the increase of the pressure, and under the condition of certain fit clearance, the minimum length of the valve core only needs to ensure the leakage standard at the lowest working pressure (along with the increase of the pressure, the clearance is reduced by the expansion sleeve 2 to meet the leakage standard requirement);
this patent description uses a shuttle valve spool as an example and is not limited to a shuttle valve spool. The principle is as follows: an expandable structure is utilized to reduce the fluid flow gap to achieve a restriction or seal.
Compared with the prior art, the fit clearance is affected by oil pressure, the larger the oil pressure is, the larger the expansion amount of the expansion sleeve 2 is, the smaller the clearance between the valve holes 15 of the expansion valve core is, the slower or reversely-increased the leakage amount is, namely, the larger the pressure is, the smaller the leakage is, and the result is that the wall thickness of the sleeve of the expansion sleeve 2 is related; the same leakage amount can be used for shortening the length of the expansion valve core, so that the installation space is saved, the machining error is reduced, and the precision requirement of machining equipment is lowered.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (7)
1. An expansion valve core, characterized in that: including valve body, inflation cover, sealing washer, gland and first check valve, valve body one end is equipped with first water conservancy diversion hole and has the chamber and the runner of holding that communicate each other in the valve body along its axial, and the valve body has annular hydraulic pressure chamber and the annular mounting groove of mutually link up, the annular mounting groove sets up in the valve body and overlaps and locate to hold the chamber outside, and annular hydraulic pressure intracavity wall passes through the runner and holds the chamber intercommunication, annular mounting groove sets up on the valve body outer peripheral face and is used for installing the inflation cover, the inflation cover cup joints at valve body periphery and inflation cover inner wall and passes through the runner and hold the chamber intercommunication, the sealing washer sets up between inflation cover and valve body, the gland is equipped with the second water conservancy diversion hole that corresponds with first water conservancy diversion hole on the one end and the gland that keep away from first water conservancy diversion hole of valve body, first check valve sets up in holding the intracavity and is connected with first water conservancy diversion hole and second water conservancy diversion hole respectively, first check valve includes first spring and the first steel ball of connection at first spring both ends.
2. The expansion valve cartridge of claim 1, wherein: the length of the annular hydraulic cavity along the axial direction of the valve body is smaller than that of the annular mounting groove along the axial direction of the valve body.
3. The expansion valve cartridge of claim 1, wherein: the valve body is provided with two annular sealing grooves for installing the sealing rings, and the annular sealing grooves are respectively positioned on two sides of the annular hydraulic cavity.
4. The expansion valve cartridge of claim 1, wherein: one side of the gland close to the valve body is provided with a spacer bush, and the gland is connected with the valve body through the spacer bush.
5. A hydraulic lock having an expansion valve core according to any one of claims 1 to 4, characterized in that: the valve comprises a valve block and an expansion valve core, wherein a first inner cavity, a second inner cavity and a third inner cavity which are sequentially arranged along the axial direction of the valve block and mutually communicated are arranged in the valve block, a third diversion hole and a fourth diversion hole are respectively arranged in the first inner cavity and the third inner cavity, a second one-way valve for controlling the third diversion hole is arranged in the first inner cavity, a third one-way valve for controlling the fourth diversion hole is arranged in the second inner cavity, the expansion valve core is arranged in the third inner cavity, a fifth diversion hole and a sixth diversion hole are respectively arranged on the side walls of two ends of the third inner cavity, and the fifth diversion hole and the sixth diversion hole are respectively positioned on two sides of the expansion valve core.
6. The hydraulic lock with the expansion spool of claim 5, wherein: the third diversion hole is communicated with a rod cavity of the hydraulic cylinder, and the fourth diversion hole is communicated with a rodless cavity of the hydraulic cylinder.
7. A hydraulic valve sealing method using the expansion valve cartridge according to claim 4, characterized in that: the method comprises the following steps: firstly, placing an expansion valve core into a valve block, and opening a first one-way valve when oil pressure is arranged on the left side of the expansion valve core, wherein hydraulic oil flows in from a first diversion hole; and the second step, when the first steel ball moves to the flow passage, hydraulic oil in the accommodating cavity enters the annular hydraulic cavity from the flow passage, the sealing ring blocks the hydraulic oil in the annular hydraulic cavity from flowing out of the expansion valve core from the expansion sleeve, and simultaneously, under the action of pressure, the expansion sleeve expands to seal the valve block, and the right one-way valve seals and blocks the hydraulic oil in the accommodating cavity from entering the second diversion hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910634257.5A CN110594218B (en) | 2019-07-15 | 2019-07-15 | Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910634257.5A CN110594218B (en) | 2019-07-15 | 2019-07-15 | Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure |
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| Publication Number | Publication Date |
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| CN110594218A CN110594218A (en) | 2019-12-20 |
| CN110594218B true CN110594218B (en) | 2024-07-09 |
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| CN201910634257.5A Active CN110594218B (en) | 2019-07-15 | 2019-07-15 | Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure |
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| CN (1) | CN110594218B (en) |
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| CN112503046A (en) * | 2020-12-07 | 2021-03-16 | 连云港师范高等专科学校 | Hydraulic valve with self-adaptive adjusting actuator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210371415U (en) * | 2019-07-15 | 2020-04-21 | 无锡市汉为液压气动有限公司 | Expansion valve core and hydraulic lock structure with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958792A (en) * | 1974-05-17 | 1976-05-25 | Barkelew Richard C | Valve with radially expansive valve plug |
| DE3144074A1 (en) * | 1980-11-10 | 1982-06-16 | Maremont Corp., 60601 Chicago, Ill. | Air filling valve |
| CN2117489U (en) * | 1992-03-26 | 1992-09-30 | 孙永才 | Expansion change valve |
| CN103791664B (en) * | 2012-10-31 | 2016-09-14 | 浙江三花股份有限公司 | A kind of with the heating power expansion valve being unidirectionally controlled function |
| CN102878734B (en) * | 2012-10-26 | 2014-10-15 | 温岭市恒发空调部件有限公司 | Expansion valve |
| CN202851488U (en) * | 2012-11-07 | 2013-04-03 | 常德中联重科液压有限公司 | Bi-direction hydraulic lock and landing leg control system and construction vehicle |
| CN103216980B (en) * | 2013-04-27 | 2015-02-04 | 温岭市恒发空调部件有限公司 | Bi-direction circulation expansion valve |
| CN203856793U (en) * | 2014-05-27 | 2014-10-01 | 常德中联重科液压有限公司 | Balance valve and hydraulic cylinder telescoping control loop with same |
| CN105781478B (en) * | 2016-04-06 | 2017-12-29 | 大庆昊运橡胶制品有限公司 | A kind of unlimited hydraulic fluid power expansion type casing external packer assembly |
| CN107237906B (en) * | 2017-07-19 | 2024-05-10 | 上海德尔格医疗器械有限公司 | Pressure relief valve and medical instrument's gas circuit system |
| CN208311567U (en) * | 2018-04-28 | 2019-01-01 | 郭怀宝 | A kind of throttling spool formula check valve |
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2019
- 2019-07-15 CN CN201910634257.5A patent/CN110594218B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210371415U (en) * | 2019-07-15 | 2020-04-21 | 无锡市汉为液压气动有限公司 | Expansion valve core and hydraulic lock structure with same |
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