CN210240156U - Holding valve - Google Patents
Holding valve Download PDFInfo
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- CN210240156U CN210240156U CN201920743169.4U CN201920743169U CN210240156U CN 210240156 U CN210240156 U CN 210240156U CN 201920743169 U CN201920743169 U CN 201920743169U CN 210240156 U CN210240156 U CN 210240156U
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Abstract
A holding valve comprises a valve locking sleeve, wherein a hydraulic cavity is arranged in the valve locking sleeve, a liquid inlet is formed in one end of the hydraulic cavity, a pressure relief opening is formed in the other end of the hydraulic cavity, a valve locking core is arranged in the middle of the hydraulic cavity in a sliding mode, the valve locking core is arranged in a sealing mode with the inner wall of the hydraulic cavity, and one end, close to the liquid inlet, of the valve locking core is matched with the liquid inlet and is sealed or separated from the liquid inlet; a liquid outlet arranged in the hydraulic cavity is close to the liquid inlet, and a through hole is formed in one end part of the lock valve core; the inside of the lock valve core is provided with a cavity which is communicated with the hydraulic cavity and the liquid outlet through a through hole, the cavity is communicated with the pressure relief opening, the pressure relief opening is provided with a sealing element and a control element, and the sealing element is sealed or separated from the pressure relief opening through the control element. When the arranged lock valve core seals the liquid inlet, the lock valve core seals the liquid inlet under the action of the return spring and by means of the pressure of the returned hydraulic oil, and the sealing effect is better when the pressure of the returned hydraulic oil is higher; after the hydraulic oil enters the liquid inlet, the lock valve core is pushed open by itself to work, and the hydraulic oil pump is simple and practical.
Description
Technical Field
The utility model relates to a hydraulic control valve, concretely relates to keep valve.
Background
The hydraulic element has the advantages of high power, simple and convenient installation and arrangement, easy control, convenient and comfortable operation, low failure rate, convenient maintenance and the like, and is very suitable for the application of agricultural machinery with changeable structural forms and severe working conditions. For decades, hydraulic technology has been increasingly applied to mechanical equipment such as agricultural machinery, machine tools, engineering machinery, construction machinery, aerospace equipment and the like, and forms a huge market. The hydraulic elements used by agricultural machinery in China have the largest quantity, the smallest variety and the lowest price, so the hydraulic element is the industrial field with the most development potential. However, the application of hydraulic technology to agricultural machinery is far from sufficient; meanwhile, the application of the hydraulic technology to agricultural machinery is limited due to the low purchasing power of farmers in China. The quality grade of the agricultural machine adopting the hydraulic technology is improved, the price is increased, and the agricultural machine is difficult to accept by farmers, so that the quality and the technical content of the main machine product are difficult to greatly improve. Therefore, the host factory has to trade off the market for a reduced configuration, changing the configuration, so that both the host product quality and the technology content are reduced.
At present, hydraulic systems of Chinese tractors mostly adopt domestic hydraulic elements, wherein a multi-way valve for controlling a lifter is also a common manual reversing multi-way valve, the position pressure maintaining of a large-flow reversing valve adopts gap sealing, a valve core with the diameter of 25mm is generally used, the leakage rate is more than or equal to 50ml/min, and the static settlement requirement of the lifter cannot be met. The leakage amount can be reduced by reducing the sealing clearance, but the manufacturing difficulty and the manufacturing cost are greatly increased by reducing the sealing clearance, and meanwhile, the failure rate of the multi-way valve is increased. Aiming at the situations, a holding valve is needed to be designed for a working port of the multi-way valve, the leakage quantity is ensured to be less than or equal to 1ml/min, and the static settlement requirement of a tractor lifter is met.
SUMMERY OF THE UTILITY MODEL
To demand among the prior art, the utility model provides a keep valve should keep valve simple structure compact, and the space accounts for than little.
A holding valve, characterized by: the hydraulic pressure valve comprises a valve locking sleeve, wherein a hydraulic cavity is arranged in the valve locking sleeve, one end of the hydraulic cavity is provided with a liquid inlet, the other end of the hydraulic cavity is provided with a pressure relief opening, a valve locking core is arranged in the middle of the hydraulic cavity in a sliding mode, the valve locking core is arranged in a sealing mode with the inner wall of the hydraulic cavity, and one end, close to the liquid inlet, of the valve locking core is matched with the liquid inlet and is sealed or separated from the liquid inlet; a liquid outlet arranged in the hydraulic cavity is close to the liquid inlet, and a through hole is formed in the end part, close to the liquid inlet, of the valve core of the lock valve;
the lock valve core is internally provided with a cavity which is communicated with the hydraulic cavity and the liquid outlet through the through hole, the cavity is communicated with the pressure relief opening, the pressure relief opening is provided with a sealing element and a control element, the sealing element is sealed or separated from the pressure relief opening through the control element, and the lock valve core is separated from the liquid inlet and then returns through the control element.
The utility model discloses a theory of operation: hydraulic oil with pressure enters the hydraulic cavity through the liquid inlet, one path of the hydraulic oil enters the cavity through the through hole, and the effect of the sealing element on sealing the pressure relief opening under the pressure action of the hydraulic oil is better after the hydraulic oil enters the cavity; the other path of the hydraulic oil is used for lifting the height of the external device through the liquid outlet, and at the moment, the pressure of the hydraulic oil at the liquid inlet is greater than the pressure of the hydraulic cavity, the cavity and the liquid outlet; after oil supply to the liquid inlet is stopped, hydraulic oil at the liquid inlet is changed into a non-pressure state, the hydraulic oil at the liquid outlet flows back to the hydraulic cavity under the action of the gravity of an external connecting device and generates pressure, meanwhile, the lock valve core is sealed on the liquid inlet again after returning through the control piece, then the pressure of the hydraulic oil in the hydraulic cavity and the pressure of the hydraulic oil in the cavity are equal to the pressure of the hydraulic oil flowing back from the liquid outlet, and the pressure of the lock valve core for plugging the liquid inlet is increased under the action of the pressure, so that; the sealing member is separated from the pressure relief opening through the control piece when the external device needs to descend, the hydraulic oil that the liquid outlet flows back is through the hydraulic pressure chamber all the way in proper order, the through-hole, flow out from the pressure relief opening behind the cavity, after the cavity decompression, under the effect of the hydraulic oil that the liquid outlet flows back, the lock valve core is pushed away from the inlet, make another way of hydraulic oil that the liquid outlet flows back flow out from the inlet, the diameter that the shutoff portion that uses the lock valve core is less than the lock valve core main part and be the prerequisite for the chamfer face at the terminal surface of shutoff portion and outer end axial face junction, under the effect of the hydraulic oil that the liquid outlet flows back. And then, after the control piece returns, the sealing piece is sealed on the pressure relief opening, and the external device is driven again in the process after the liquid inlet is filled with hydraulic oil.
Further comprises the following steps: the hydraulic cavity and the lock valve core are cylindrical, the end parts of two ends of the lock valve core are respectively a sliding part and a plugging part, the sliding part is in sliding fit with the hydraulic cavity, the port of the plugging part is arranged in a sealing manner, the joint of the end surface of the plugging part and the axial surface of the outer end is a chamfered surface, an annular convex edge matched with the chamfered surface is integrally arranged on the inner wall of the hydraulic cavity at the liquid inlet, and the annular convex edge is in contact with the chamfered surface and is arranged in a sealing manner; the through hole is located on the outer circumference of the blocking portion. The sealing effect of the sealing of the surface in line contact is better.
Further comprises the following steps: the sealing element comprises a sealing ball and a fixedly arranged sliding groove, and the sealing ball is positioned in the sliding groove and is in sliding fit with the sliding groove; one end of the sliding groove is covered on the pressure relief opening; the control piece comprises a return spring and a push rod, the return spring is positioned in the sliding groove, one side of the sealing ball is blocked on the pressure relief opening, the other side of the sealing ball is connected with one end of the return spring, and the other end of the return spring is fixedly arranged on the lock valve core; the ejector rod is used for ejecting the sealing ball to enable the sealing ball to be separated from the pressure relief opening. The sealing ball and the lock valve sleeve are reset under the action of a return spring; the ejector rod is in sliding fit with the lock valve sleeve, and the end part of one end of the ejector rod is close to the pressure relief opening (and the other end of the ejector rod is located outside the lock valve sleeve). The ejector rod is driven by external force to move, and the ejector rod pushes the sealing ball to separate the sealing ball from the pressure relief opening.
Further comprises the following steps: the port opening of the sliding part is arranged, the sliding groove is located in the cavity, one end of the return spring is abutted to the sealing ball, and the other end of the return spring is abutted to the inner end face of the blocking part. The structure is more compact.
Further comprises the following steps: the hydraulic pressure relief device comprises a pilot seat, wherein the pilot seat is fixed in a sealing mode in a hydraulic cavity, a pressure relief opening is formed in the pilot seat, and a sliding groove and the pilot seat are integrally arranged. Is convenient for processing and assembling.
Further comprises the following steps: a sliding sleeve is arranged between the ejector rod and the hydraulic cavity, the sliding sleeve is fixed in the hydraulic cavity in a sealing mode, the middle of the ejector rod is in sliding fit with the sliding sleeve and is arranged in a sealing mode, and the outer end of the ejector rod is located outside the sliding sleeve; a gap is reserved between the guide seat and the sliding sleeve, and a backflow port is arranged on the position, corresponding to the gap, of the lock valve sleeve. The return port is used for returning the hydraulic oil flowing out of the pressure relief port to the oil storage tank.
The utility model has the advantages that: when the arranged lock valve core seals the liquid inlet, the lock valve core seals the liquid inlet under the action of the return spring and by means of the pressure of the backflow hydraulic oil, the sealing effect is better when the backflow hydraulic oil pressure is higher, and therefore the requirement of the multi-way valve on the leakage amount is met; after the hydraulic oil enters the liquid inlet, the lock valve core is pushed open by self to work, and the hydraulic oil pump is simple and practical; the liquid inlet is provided with the convex edge which is in contact sealing with the chamfer surface at the end part of the lock valve core, and the sealing effect of the sealing of the surface and the line contact is better, so that the leakage is not easy to occur; the assembly of the lock valve core, the return spring and the sealing ball is simple in structure, easy to assemble and simple and stable in structure; the push rod pushes the sealing ball to open the pressure relief port for pressure relief, the structure is simple and easy to operate, and the complexity of the conventional internal operation structure is avoided.
Drawings
Fig. 1 is a schematic sectional view of the utility model in a first state;
fig. 2 is a schematic sectional view of the utility model in a second state;
fig. 3 is a schematic sectional view of the third state of the present invention.
In the figure, 1, a mandril; 2. A sliding sleeve; 3. a lock valve housing; 30. a hydraulic chamber; 31. a liquid inlet; 311. an annular rib; 32. a liquid outlet; 33. a return port; 4. a pilot base; 41. a pressure relief port; 5. a sealing ball; 6. a lock valve core; 60. a cavity; 61. a sliding part; 62. a plugging section; 621. a through hole; 622. chamfering; 7. a return spring; 8. a chute.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. It should be noted that the terms of orientation such as left, middle, right, up and down in the examples of the present invention are only relative to each other or are referred to the normal use status of the product, and should not be considered as limiting.
A holding valve comprises a lock valve sleeve 3, as shown in fig. 1 and fig. 2, a hydraulic cavity 30 is arranged in the lock valve sleeve 3, a liquid inlet 31 is arranged at one end of the hydraulic cavity 30, a pressure relief port 41 is arranged at the other end of the hydraulic cavity 30, a lock valve core 6 is arranged in the middle of the hydraulic cavity 30 in a sliding mode, the lock valve core 6 is arranged in a sealing mode with the inner wall of the hydraulic cavity 30, and one end, close to the liquid inlet 31, of the lock valve core 6 is matched with the liquid inlet 31 and is sealed or separated from the liquid inlet 31; a liquid outlet 32 arranged in the hydraulic cavity 30 is close to the liquid inlet 31, the liquid outlet 32 is located at the end of the lock valve sleeve 3 where the liquid inlet 31 is located, and a through hole 621 is formed in the end of the lock valve core 6 close to the liquid inlet;
a cavity 60 is arranged in the lock valve core 6, the cavity 60 is communicated with the hydraulic cavity 30 through the through hole 621 and is communicated with the liquid outlet 32, the cavity 60 is communicated with the pressure relief port 41, a sealing element and a control element are arranged at the pressure relief port 41, the sealing element is sealed or separated from the pressure relief port 41 through the control element, and the lock valve core 6 is separated from the liquid inlet 31 and then returns through the control element;
wherein, as shown in fig. 3, the hydraulic chamber 30 and the lock valve core 6 are both of a cylinder type, the end portions of the two ends of the lock valve core 6 are respectively a sliding portion 61 and a blocking portion 62, the sliding portion 61 is in sliding fit with the hydraulic chamber 30, the outer circumference of the sliding portion 61 is matched and attached with the outer circumference of the hydraulic chamber 30, the port of the blocking portion 62 is sealed, the joint of the end surface of the blocking portion 62 and the outer end axial surface is a chamfered surface 622, the inner wall of the hydraulic chamber 30 is provided with an annular rib 311 which is integrally arranged at the liquid inlet 31 and matched with the chamfered surface 622, the lock valve sleeve 3 is provided with a liquid inlet channel, the inner end of the liquid inlet channel is a liquid inlet 31, the liquid inlet channel is circular and has a radius smaller than the radius of the hydraulic chamber 30, a step is formed from the inner end of the liquid inlet channel to the inner wall of the hydraulic chamber 30, the upper edge of the step is provided with a, the annular convex rib 311 is in contact with the chamfered surface 622 and is arranged in a sealing manner; the through hole 621 is located on the outer circumference of the blocking portion 62;
the sealing element comprises a sealing ball 5 and a fixedly arranged sliding groove 8, and the sealing ball 5 is positioned in the sliding groove 8 and is in sliding fit with the sliding groove 8; one end of the chute 8 is covered on the pressure relief port 41; the control piece comprises a return spring 7 and a push rod 1, the return spring 7 is positioned in the sliding groove 8, one side of the sealing ball 5 is plugged on the pressure relief opening 41, the other side of the sealing ball 5 is connected with one end of the return spring 7, and the other end of the return spring 7 is fixedly arranged on the lock valve core 6; the ejector rod 1 is used for ejecting the sealing ball 5 to separate the sealing ball from the pressure relief port 41. The sealing ball 5 and the lock valve sleeve 3 are returned under the action of a return spring 7; the middle part of the ejector rod 1 is in sliding fit with the lock valve sleeve 3, the end part of the inner end of the ejector rod 1 is close to the pressure relief port 41, the end part of the inner end of the ejector rod 1 is smaller than the pressure relief port 41, a gap is reserved between the ejector rod 1 and the pressure relief port 41 when the ejector rod 1 is arranged in the pressure relief port 41 in a penetrating mode, and the outer end of the ejector rod 1 is located outside the lock valve; the opening of the port of the sliding part 61 is arranged, the sliding groove 8 is positioned in the cavity 60, one end of the return spring 7 is abutted against the sealing ball 5, and the other end of the return spring 7 is abutted against the inner end face of the blocking part 62; the hydraulic control valve comprises a pilot seat 4, wherein the pilot seat 4 is fixed in a hydraulic cavity 30 in a sealing mode, a sealing ring is arranged between the pilot seat 4 and the inner wall of the hydraulic cavity 30 in an interference fit mode, a pressure relief opening 41 is formed in the pilot seat 4, a sliding groove 8 and the pilot seat 4 are integrally arranged, and an ejector rod, a sealing ball, a return spring, a valve core and a valve sleeve are located on the same axis.
Referring to fig. 3, a sliding sleeve 2 is arranged between the ejector rod 1 and the hydraulic cavity 30, the sliding sleeve 2 is sealed by a sealing ring and is fixedly arranged in the hydraulic cavity 30 in an interference fit manner, the middle part of the ejector rod 1 is in sliding fit with the sliding sleeve 2 and is arranged in a sealing manner by the sealing ring, and the outer end of the ejector rod 1 is located outside the sliding sleeve 2; a gap is reserved between the pilot seat 4 and the sliding sleeve 2, and a return port 33 is arranged on the position of the valve locking sleeve 3 corresponding to the gap.
The utility model discloses a theory of operation: hydraulic oil with pressure pushes the lock valve core away through the liquid inlet and then enters the hydraulic cavity, one path of the hydraulic oil enters the cavity through the through hole, and after the hydraulic oil enters the cavity, the effect of sealing the pressure relief opening by the sealing ball under the pressure action of the hydraulic oil is better, wherein the sealing ball is always blocked on the pressure relief opening under the action of the return spring; the other path of the hydraulic oil is used for lifting the height of the external device through the liquid outlet, and at the moment, the pressure of the hydraulic oil at the liquid inlet is greater than the pressure of the hydraulic cavity, the cavity and the liquid outlet; after oil supply to the liquid inlet is stopped, hydraulic oil at the liquid inlet is changed into a non-pressure state, the hydraulic oil at the liquid outlet flows back to the hydraulic cavity under the action of the gravity of an external connecting device and generates pressure, meanwhile, the lock valve core is reset through the return spring and then sealed on the liquid inlet again, then the pressure of the hydraulic oil in the hydraulic cavity and the pressure of the hydraulic oil in the cavity are equal to the pressure of the hydraulic oil flowing back from the liquid outlet, and the pressure of the lock valve core for plugging the liquid inlet is increased under the action of the pressure, so that; the sealing ball is propped through the ejector pin when external device needs to descend and the sealing ball is separated from the pressure relief opening, the hydraulic oil that the liquid outlet backward flow is through the hydraulic pressure chamber all the way in proper order, the through-hole, flow from the pressure relief opening behind the cavity, behind the cavity decompression, use the shutoff portion of lock case to be less than the diameter of lock case main part and be the prerequisite for the chamfer face at the terminal surface of shutoff portion and outer end axial plane junction, under the effect of the hydraulic oil that the liquid outlet backward flow, the lock case is pushed away from the inlet, make the hydraulic oil another way of liquid outlet backward flow from the inlet outflow, thereby make external device slowly descend, hydraulic oil flows back to the oil storage tank through the backward flow opening. And then, after the ejector rod returns, the sealing ball is sealed on the pressure relief opening again under the action of the return spring, and the external device is driven again in the process after the liquid inlet is filled with hydraulic oil.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A holding valve, characterized by: the hydraulic pressure valve comprises a valve locking sleeve, wherein a hydraulic cavity is arranged in the valve locking sleeve, one end of the hydraulic cavity is provided with a liquid inlet, the other end of the hydraulic cavity is provided with a pressure relief opening, a valve locking core is arranged in the middle of the hydraulic cavity in a sliding mode, the valve locking core is arranged in a sealing mode with the inner wall of the hydraulic cavity, and one end, close to the liquid inlet, of the valve locking core is matched with the liquid inlet and is sealed or separated from the liquid inlet; a liquid outlet arranged in the hydraulic cavity is close to the liquid inlet, and a through hole is formed in the end part, close to the liquid inlet, of the valve core of the lock valve;
the lock valve core is internally provided with a cavity, the cavity is communicated with the hydraulic cavity and the liquid outlet through the through hole, the cavity is communicated with the pressure relief opening, a sealing element and a control element are arranged at the pressure relief opening, and the sealing element is sealed or separated from the pressure relief opening through the control element.
2. A holding valve as claimed in claim 1, wherein: the hydraulic cavity and the lock valve core are cylindrical, the end parts of two ends of the lock valve core are respectively a sliding part and a plugging part, the sliding part is in sliding fit with the hydraulic cavity, the port of the plugging part is arranged in a sealing manner, the joint of the end surface of the plugging part and the axial surface of the outer end is a chamfered surface, an annular convex edge matched with the chamfered surface is integrally arranged on the inner wall of the hydraulic cavity at the liquid inlet, and the annular convex edge is in contact with the chamfered surface and is arranged in a sealing manner; the through hole is located on the outer circumference of the blocking portion.
3. A holding valve as claimed in claim 2, wherein: the sealing element comprises a sealing ball and a fixedly arranged sliding groove, and the sealing ball is positioned in the sliding groove and is in sliding fit with the sliding groove; one end of the sliding groove is covered on the pressure relief opening; the control piece comprises a return spring and a push rod, the return spring is positioned in the sliding groove, one side of the sealing ball is blocked on the pressure relief opening, the other side of the sealing ball is connected with one end of the return spring, and the other end of the return spring is fixedly arranged on the lock valve core; the ejector rod is in sliding fit with the valve locking sleeve, and the end part of one end of the ejector rod is close to the pressure relief opening.
4. A holding valve as claimed in claim 3, wherein: the port opening of the sliding part is arranged, the sliding groove is located in the cavity, one end of the return spring is abutted to the sealing ball, and the other end of the return spring is abutted to the inner end face of the blocking part.
5. A holding valve as claimed in claim 4, wherein: the hydraulic pressure relief device comprises a pilot seat, wherein the pilot seat is fixed in a sealing mode in a hydraulic cavity, a pressure relief opening is formed in the pilot seat, and a sliding groove and the pilot seat are integrally arranged.
6. A holding valve as claimed in claim 5, wherein: a sliding sleeve is arranged between the ejector rod and the hydraulic cavity, the sliding sleeve is fixed in the hydraulic cavity in a sealing mode, the middle of the ejector rod is in sliding fit with the sliding sleeve and is arranged in a sealing mode, and the outer end of the ejector rod is located outside the sliding sleeve; a gap is reserved between the guide seat and the sliding sleeve, and a backflow port is arranged on the position, corresponding to the gap, of the lock valve sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920743169.4U CN210240156U (en) | 2019-05-22 | 2019-05-22 | Holding valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920743169.4U CN210240156U (en) | 2019-05-22 | 2019-05-22 | Holding valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210240156U true CN210240156U (en) | 2020-04-03 |
Family
ID=69971507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920743169.4U Active CN210240156U (en) | 2019-05-22 | 2019-05-22 | Holding valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210240156U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185665A (en) * | 2019-05-22 | 2019-08-30 | 新乡市德恩智能工业有限公司 | A kind of holding valve |
-
2019
- 2019-05-22 CN CN201920743169.4U patent/CN210240156U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185665A (en) * | 2019-05-22 | 2019-08-30 | 新乡市德恩智能工业有限公司 | A kind of holding valve |
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