CN210371415U - Expansion valve core and hydraulic lock structure with same - Google Patents
Expansion valve core and hydraulic lock structure with same Download PDFInfo
- Publication number
- CN210371415U CN210371415U CN201921100030.4U CN201921100030U CN210371415U CN 210371415 U CN210371415 U CN 210371415U CN 201921100030 U CN201921100030 U CN 201921100030U CN 210371415 U CN210371415 U CN 210371415U
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- valve body
- valve
- expansion
- water conservancy
- conservancy diversion
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- 238000007789 sealing Methods 0.000 claims abstract description 24
- 210000004907 gland Anatomy 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 125000006850 spacer group Chemical group 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims 5
- 238000003754 machining Methods 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract description 7
- 230000001133 acceleration Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 20
- 239000010720 hydraulic oil Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 4
- 230000004323 axial length Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model relates to an expansion valve core and hydraulic pressure lock structure who has expansion valve core, including valve body, expansion cover, sealing washer, gland and first check valve, valve body one end is equipped with chamber and the runner that holds that has mutual intercommunication in first water conservancy diversion hole and the valve body along its axial, the expansion cover cup joints and passes through the runner and hold the chamber intercommunication in valve body periphery and expansion cover inner wall, the sealing washer sets up between expansion cover and valve body, the gland is installed and 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 first water conservancy diversion hole was kept away from to the valve body, first check valve setting is holding the intracavity and is connected with first water conservancy diversion hole and second water conservancy diversion hole respectively. The fit clearance receives the oil pressure to influence, the utility model discloses utilize the oil pressure big more, the inflation volume of inflation cover is big more, and the clearance between inflation case valve opening is little more, makes its acceleration rate of leaking the leakage volume slow down or contrary increase, has saved installation space, reduces machining error, reduces the required precision of processing equipment.
Description
Technical Field
The utility model relates to a case for hydraulic cylinder especially relates to an expansion valve core and hydraulic pressure lock structure that has expansion valve core.
Background
The valve core is often used for various hydraulic components and is one of necessary hydraulic parts. There are two common conventional valve core sealing methods: the contact seal can enable the valve core to achieve zero leakage through the seal, but is limited by the space limit required by the installation of the seal, and the undersized valve core cannot use the contact seal; 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 requirement of the working condition through a reasonable fit clearance and a sufficient throttling length. The clearance type sealed valve core and the valve hole need high processing precision and assembly requirements; the clearance seal always has leakage and is influenced by various factors such as the temperature of the system, the viscosity of oil and the like.
Therefore, a valve element and a hydraulic valve sealing method which can increase the leakage rate and increase the oil pressure reversely, save the installation space, reduce the machining error and reduce the precision of machining equipment are urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at prior art's defect, it is big more to provide an oil pressure, and the inflation volume of inflation cover is big more, makes the clearance between the case valve opening smaller, makes its acceleration rate of letting out the leakage volume slow down or contrary increase, save installation space, reduces machining error, reduces the required precision of processing equipment and can solve the expansion valve core of above-mentioned problem and the hydraulic pressure lock structure that has the expansion valve core.
The utility model discloses a realize through 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 chamber and the runner that holds that has mutual intercommunication in first water conservancy diversion hole and the valve body along its axial, the inflation cover cup joints and passes through the runner and hold the chamber intercommunication in valve body periphery and inflation cover inner wall, the sealing washer sets up between inflation cover and valve body, the gland is installed and is equipped with the second water conservancy diversion hole that corresponds with first water conservancy diversion hole on the one end of keeping away from first water conservancy diversion hole and the gland at the 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 the sealing performance of the expansion sleeve, the valve body is provided with an annular hydraulic cavity and an annular mounting groove which are mutually communicated, the annular mounting groove is arranged in the valve body and sleeved outside the accommodating cavity, the inner wall of the annular hydraulic cavity is communicated with the accommodating cavity through a flow channel, and the annular mounting groove is arranged on the outer peripheral surface of the valve body and used for mounting the expansion sleeve.
The sealing performance of the expansion sleeve is further enhanced, and the length of the annular hydraulic cavity in the axial direction of the valve body is smaller than that of the annular mounting groove in the axial direction of the valve body.
In order to facilitate blocking of hydraulic oil in the annular hydraulic cavity to flow out of the valve body from the expansion sleeve, two annular sealing grooves used for installing sealing rings are arranged on the valve body, and the annular sealing grooves are respectively located on two sides of the annular hydraulic cavity.
In order to facilitate 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, which is close to the valve body, is provided with a spacer bush, and the gland is connected with the valve body through the spacer bush.
A hydraulic lock structure with an expansion valve core comprises a valve block and the 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 are communicated with each other are arranged in the valve block, a third flow guide hole and a fourth flow guide hole are respectively arranged in the first inner cavity and the third inner cavity, a second one-way valve used for controlling the third flow guide hole is arranged in the first inner cavity, a third one-way valve used for controlling the fourth flow guide hole is arranged in the second inner cavity, the expansion valve core is arranged in the third inner cavity, side walls of two ends of the third inner cavity are respectively provided with a fifth flow guide hole and a sixth flow guide hole, and the fifth flow guide hole and the sixth flow guide hole are respectively positioned on two sides of the expansion valve core.
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 adopting an expansion valve core comprises the following steps: firstly, an expansion valve core is placed in a valve block, when oil pressure exists on the left side of the expansion valve core, a first one-way valve is opened, and hydraulic oil flows in from a first flow guide hole; and secondly, after the first steel ball moves to the flow channel, the hydraulic oil in the accommodating cavity enters the annular hydraulic cavity from the flow channel, 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 check valve blocks the hydraulic oil in the accommodating cavity from entering the second flow guide hole.
This practical neotype beneficial effect is:
the fit clearance is influenced 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 acceleration of the leakage amount of the expansion valve core is slowed down or reversely increased, namely, the larger the pressure is, the smaller the leakage is, and the result is related to the wall thickness of a sleeve of the expansion sleeve;
the length of the expansion valve core can be shortened by the same leakage amount, 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 structural view of an expansion valve core;
FIG. 2 is a schematic diagram of a hydraulic lock configuration with an expansion valve spool;
FIG. 3 is a diagram showing the state of the hydraulic lock structure with an expansion valve core in cooperation with an oil cylinder;
in the figure: 1. a valve body; 11. a first flow guide hole; 12. an accommodating chamber; 13. a flow channel; 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 flow guide hole; 42. a spacer sleeve; 5. a first check 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 flow guide hole; 65. a fourth diversion hole; 66. a second one-way valve; 67. a fifth flow guide hole; 68. a sixth flow guide hole; 69. a third check valve; 7. a hydraulic cylinder; 71. a rod cavity; 72. a rodless cavity.
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. 1-3, 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 flow guide hole 11 along the axial direction thereof, the valve body 1 is internally provided with a containing cavity 12 and a flow channel 13 which are communicated with each other, 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 containing 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 of the valve body 1 far away from the first flow guide hole 11, the gland 4 is provided with a second flow guide 41 hole 15 corresponding to the first flow guide hole 11, the first check valve 5 is arranged in the containing cavity 12 and respectively connected with the first flow guide hole 11 and the second flow guide 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, annular hydraulic chamber 14 inner wall passes through runner 13 and holds chamber 12 intercommunication, annular mounting groove 15 sets up on 1 outer peripheral face of valve body and is used for installing inflation cover 2, annular hydraulic chamber 14 is less than annular mounting groove 15 along 1 axial length of its valve body along the axial length of its valve body, be equipped with two annular seal groove 16 and the annular seal groove 16 that are used for installing sealing washer 3 on valve body 1 and be located the both sides of annular hydraulic chamber 14 respectively, first check valve 5 includes first spring 51 and connects the first steel ball 52 at first spring 51 both ends, one side that gland 4 is close to valve body 1 is equipped with spacer 42, gland 4 passes through spacer 42 and is connected with valve body 1.
A hydraulic lock structure with an 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 are mutually communicated are arranged in the valve block 6, the first inner cavity 61 and the third inner cavity 63 are respectively provided with a third diversion hole 64 and a fourth diversion hole 65, the first inner cavity 61 is internally provided with a second one-way valve 66 for controlling the third diversion hole 64, the second inner cavity 62 is internally provided with a third one-way valve 69 for controlling the fourth diversion hole 65, the expansion valve core is arranged in the third inner cavity 63, the side walls of the two ends of the third inner cavity 63 are respectively provided with a fifth diversion hole 67 and a sixth diversion hole 68, the fifth pilot hole 67 and the sixth pilot hole 68 are located at both sides of the expansion valve spool, in order to facilitate self-locking and sealing, the third diversion hole 64 is communicated with a rod cavity 71 of the hydraulic cylinder 7, and the fourth diversion hole 65 is communicated with a rodless cavity 72 of the hydraulic cylinder 7.
A hydraulic valve sealing method adopting an expansion valve core comprises the following steps: firstly, an expansion valve core is placed in a valve block 6, when oil pressure exists on the left side of the expansion valve core, a first one-way valve 5 is opened, and hydraulic oil flows in from a first flow guide hole 11; and secondly, 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 prevents the hydraulic oil in the annular hydraulic cavity 14 from flowing out of the expansion valve core from the expansion sleeve 2, meanwhile, under the action of pressure, the expansion sleeve 2 expands to seal the valve block 6, and the right one-way valve seals the hydraulic oil in the accommodating cavity 12 and prevents the hydraulic oil from entering the second flow guide 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 oil 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 an oil tank from a right oil way, in order to avoid the situation 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 cores L and Ss are constant, and leakage amount is caused by factors such as machining errors and motion abrasion and the like.
It should be noted that the theoretical calculation of the flow rate is referred to the form in the following table, and ideally, the concentric circular seam is used, but in actual conditions, the valve core does not operate vertically, and the maximum eccentric circular seam is used as most of the conditions:
maximum eccentric ring gap
The true bookThe principle is explained by a novel ideal state, namely concentric circular seams: concentric ring gap flow
After the expansion valve core is applied, the oil pressure P pushes open the first one-way valve 5 on the left side in the expansion valve core, so that the expansion sleeve 2 on the expansion valve core is expanded, and Ss is further reduced, namely Ss is changed along with the pressure change.
The leakage equation of the expansion valve core is as follows: leakage amount
The discharge rate is in direct proportion to the pressure, the diameter of the expansion valve core and the clearance, and is in inverse proportion to the length and the viscosity coefficient;
the diameter variation of the expansion sleeve 2 after being pressed is as follows: change in expanded diameter
The diameter variation of the expansion sleeve 2 is in direct proportion to the pressure;
since the left side pressure of the expansion valve core is P and the right side pressure is 0 (oil tank), the pressure outside the right side of the expansion valve core is reduced along with the increase of the length L, and the pressure inside the expansion sleeve 2 is always P, so that the expansion amount of the right side of the expansion sleeve 2 is increased along with the increase of the differential pressure, the smaller the gap between the outer side and the valve hole 15 is, and the more obvious the throttling effect is.
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;
the requirement is simultaneously satisfied that the expansion sleeve 2 does not generate plastic deformation under the maximum impact pressure:
pn is the service 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 gap Ss, the internal leakage generated on the expansion valve core is effectively reduced along with the increase of the pressure, the performance of 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 requirement of the leakage standard);
this patent specification exemplifies a shuttle valve cartridge and is not limited to shuttle valve cartridges. The principle is as follows: an expandable structure is utilized to reduce the flow gap of the fluid to achieve a restriction or seal.
Compared with the prior art, the fit clearance is influenced 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 the acceleration or the reverse increase of the leakage amount is, namely, the larger the pressure is, the smaller the leakage is, and the result is related to the sleeve wall thickness of the expansion sleeve 2; the length of the expansion valve core can be shortened by the same leakage amount, the installation space is saved, the machining error is reduced, and the precision requirement of machining equipment is lowered.
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 (8)
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 chamber and the runner that holds that has mutual intercommunication in first water conservancy diversion hole and the valve body along its axial, the inflation cover cup joints at valve body periphery and inflation cover inner wall through the runner and holds the chamber intercommunication, the sealing washer sets up between inflation cover and valve body, the gland is installed and is equipped with the second water conservancy diversion hole that corresponds with first water conservancy diversion hole on the one end of keeping away from first water conservancy diversion hole at the valve body and the gland, first check valve sets up and holds the intracavity and respectively with first water conservancy diversion hole and second water conservancy diversion jogged joint.
2. The expansion valve cartridge of claim 1, wherein: the valve body has cyclic annular hydraulic pressure chamber and the cyclic annular mounting groove that link up each other, cyclic annular mounting groove sets up in the valve body and the cover is located and is held outside the chamber, cyclic annular hydraulic pressure intracavity wall through the runner with hold the chamber intercommunication, cyclic annular mounting groove sets up on the valve body outer peripheral face and is used for installing the inflation cover.
3. The expansion valve cartridge of claim 2, 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.
4. The expansion valve cartridge of claim 3, wherein: the valve body is provided with two annular seal grooves for mounting the seal ring, and the annular seal grooves are respectively positioned on two sides of the annular hydraulic cavity.
5. The expansion valve cartridge of claim 1, wherein: the first one-way valve comprises a first spring and first steel balls connected to two ends of the first spring.
6. The expansion valve cartridge of claim 1, wherein: and a spacer bush is arranged on one side of the gland close to the valve body, and the gland is connected with the valve body through the spacer bush.
7. The utility model provides a hydraulic pressure lock structure with expansion valve core which characterized by: the expansion valve core comprises a valve block and the expansion valve core according to any one of claims 1 to 6, 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 are communicated with each other are arranged in the valve block, a third flow guide hole and a fourth flow guide hole are respectively arranged in the first inner cavity and the third inner cavity, a second one-way valve for controlling the third flow guide hole is arranged in the first inner cavity, a third one-way valve for controlling the fourth flow guide hole is arranged in the second inner cavity, the expansion valve core is arranged in the third inner cavity, a fifth flow guide hole and a sixth flow guide hole are respectively arranged on the side walls of the two ends of the third inner cavity, and the fifth flow guide hole and the sixth flow guide hole are respectively positioned on the two sides of the expansion valve.
8. The hydraulic lock structure with an expansion spool according to claim 7, wherein: the third flow guide hole is communicated with a rod cavity of the hydraulic cylinder, and the fourth flow guide hole is communicated with a rodless cavity of the hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921100030.4U CN210371415U (en) | 2019-07-15 | 2019-07-15 | Expansion valve core and hydraulic lock structure with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921100030.4U CN210371415U (en) | 2019-07-15 | 2019-07-15 | Expansion valve core and hydraulic lock structure with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210371415U true CN210371415U (en) | 2020-04-21 |
Family
ID=70271279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921100030.4U Withdrawn - After Issue CN210371415U (en) | 2019-07-15 | 2019-07-15 | Expansion valve core and hydraulic lock structure with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210371415U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594218A (en) * | 2019-07-15 | 2019-12-20 | 无锡市汉为液压气动有限公司 | Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure |
| CN111894931A (en) * | 2020-07-24 | 2020-11-06 | 东莞海特帕沃液压科技有限公司 | Hydraulic lock |
-
2019
- 2019-07-15 CN CN201921100030.4U patent/CN210371415U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594218A (en) * | 2019-07-15 | 2019-12-20 | 无锡市汉为液压气动有限公司 | Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure |
| CN110594218B (en) * | 2019-07-15 | 2024-07-09 | 无锡市汉为液压气动有限公司 | Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure |
| CN111894931A (en) * | 2020-07-24 | 2020-11-06 | 东莞海特帕沃液压科技有限公司 | Hydraulic lock |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200421 Effective date of abandoning: 20240709 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200421 Effective date of abandoning: 20240709 |