CN211820155U - Safety valve and engineering machinery - Google Patents
Safety valve and engineering machinery Download PDFInfo
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- CN211820155U CN211820155U CN202020515419.1U CN202020515419U CN211820155U CN 211820155 U CN211820155 U CN 211820155U CN 202020515419 U CN202020515419 U CN 202020515419U CN 211820155 U CN211820155 U CN 211820155U
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Abstract
The utility model relates to a hydraulic pressure technical field particularly, relates to a relief valve and engineering machine tool. The safety valve comprises a valve body, a sliding valve core, a conical valve core, an elastic piece and a buffer piston; the cone valve core is movably connected with the sliding valve core, and the end part of the sliding valve core and the cone valve core enclose to form a sealed first space; the end part of the buffer piston close to the slide valve core and the valve body form a sealed second space; an inlet of the conical valve core is used for being connected with an oil inlet of the valve body, and an outlet of the conical valve core is connected with the first space through a first throttling hole; the elastic piece provides elastic force to enable the cone valve core to move so as to seal an oil return port of the valve body; the first space extends to the second space through the inner cavity of the spool, and the spool is connected with the second space through the second orifice. The buffer overflow function of the motor can be efficiently and quickly completed.
Description
Technical Field
The utility model relates to a hydraulic pressure technical field particularly, relates to a relief valve and engineering machine tool.
Background
In the process of walking starting and braking of the engineering mechanical excavator, the load of the walking mechanism rises instantly to be larger, the internal impact of the walking mechanism is larger, the abrasion of parts is serious, and the average service life of the motor buffering overflow device is shorter.
In the prior art, the safety valve has poor buffering effect and cannot better play the role of buffering overflow protection.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a relief valve and engineering machine tool, for example, it can accomplish the buffering overflow function to the motor high-efficiently, swiftly.
The embodiment of the utility model discloses a can realize like this:
in a first aspect, an embodiment of the present invention provides a safety valve, which is used for being connected with a motor, including:
the valve comprises a valve body, a sliding valve core, a conical valve core, an elastic piece and a buffer piston, wherein the sliding valve core, the conical valve core, the elastic piece and the buffer piston are movably arranged in the valve body;
the cone valve core is movably connected with the sliding valve core, and the end part of the sliding valve core and the cone valve core enclose to form a sealed first space;
the end part of the buffer piston close to the slide valve core and the valve body form a sealed second space;
an inlet of the conical valve core is used for being connected with an oil inlet of the valve body, and an outlet of the conical valve core is connected with the first space through a first throttling hole;
the elastic piece provides elastic force to enable the cone valve core to move so as to seal an oil return port of the valve body;
the first space extends to a second space through an inner cavity of the spool, and the spool is connected with the second space through a second orifice.
In an alternative embodiment, the throttle opening of the second throttle hole is adjustable. The second throttle hole is set as a variable throttle for adjusting the damping time. So can adjust the state of relief valve under different operating modes and the condition effectively to make the motor can adapt to more operating condition.
In an alternative embodiment, the valve body comprises a main valve seat, a main valve sleeve and a bushing;
the bushing is arranged at one end of the main valve seat, and the main valve sleeve is arranged at the other end of the main valve seat; the cone valve core, the slide valve core and the elastic piece are arranged in the main valve seat, and the buffer piston is arranged in the main valve sleeve;
the oil return port of the valve body is arranged on the main valve seat, and the oil inlet of the valve body is arranged on the bushing. The valve body comprises a main valve seat, a main valve sleeve and a bushing respectively, so that the whole structure of the valve body is simpler, the valve body is simple to manufacture and convenient to assemble, the whole occupied space is smaller, and the economic benefit is outstanding.
In an alternative embodiment, the end of the bushing remote from the main valve seat has a first tapered surface that connects with a motor port. The bushing is sealed with the motor conical surface, so that the safety valve is stably connected with the motor, and the conical surface is good in sealing effect, simple in structure and small in occupied space.
In an alternative embodiment, the bushing is in interference engagement with the main valve seat. The bush and the main valve seat are in interference connection, so that the tightness of the main valve seat can be guaranteed while the stable connection of the bush and the main valve seat is guaranteed.
In an alternative embodiment, the end of the main valve seat adjacent to the bushing has a second conical surface that connects with the oil inlet on the bushing. The sealing performance between the main valve seat and the bushing can be remarkably improved by adopting a conical surface sealing mode.
In an alternative embodiment, the valve body further comprises a first seal, and the spool is sealed from the main spool by the first seal. The first sealing element guarantees the sealing performance between the sliding valve core and the main valve sleeve, and the stability of the whole structure of the safety valve is guaranteed.
In an alternative embodiment, the valve body further comprises a threaded sleeve;
the thread sleeve is arranged at the end part of the main valve seat close to the main valve sleeve, and the thread sleeve seals the main valve seat and the main valve sleeve simultaneously. The threaded sleeve is connected with the main valve sleeve, so that the whole valve body is covered, and the stability and the reliability of the whole structure are guaranteed.
In an alternative embodiment, the threaded sleeve is in threaded connection with the main valve sleeve. The threaded connection has the characteristics of simple structure and convenience in operation, and the sealing performance is outstanding.
In a second aspect, an embodiment of the present invention provides a construction machine, including the safety valve according to any one of the preceding embodiments.
The utility model discloses beneficial effect includes, for example:
the safety valve of this scheme has first orifice, second orifice to and buffer piston, thereby realize secondary throttle and buffer function, such mode of setting up can fully eliminate the pressure fluctuation and strike, pressure when avoiding the motor switching-over strikes, has ensured motor working process's stability and security, and simple structure, small, consequently has outstanding economic benefits.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of the safety valve according to the present embodiment of the present invention.
Icon: 1-a bushing; 2-a cone valve core; 3-a spool; 4-a second seal; 5-a second retainer ring; 6-a spring; 7-main valve seat; 8-a gasket; 9-a first retainer ring; 10-a first seal; 11-main valve sleeve; 12-a buffer piston; 13-thread sleeve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a safety valve, and the present embodiment provides a safety valve for connecting with a motor, including a valve body spool 3, a cone spool 2, an elastic member, and a damping piston 12.
The slide valve core 3, the cone valve core 2, the elastic piece and the buffer piston 12 are movably arranged in the valve body;
the cone valve core 2 is movably connected with the slide valve core 3, and the end part of the slide valve core 3 and the cone valve core 2 enclose to form a sealed first space;
the end part of the buffer piston 12 close to the slide valve core 3 and the valve body form a sealed second space;
an inlet of the cone valve core 2 is used for being connected with an oil inlet of the valve body, and an outlet of the cone valve core 2 is connected with the first space through a first throttling hole;
the elastic element provides elastic force to make the cone valve core 2 move to seal the oil return port of the valve body;
the first space extends through the interior of the spool 3 to the second space, and the spool 3 is connected to the second space via a second orifice.
In the prior art, the safety valve buffer device is completely arranged outside the overflow valve sleeve and directly bears pressure impact, so that the buffer device is easy to clamp and seriously worn, the average service life of the buffer device is short, and meanwhile, the buffer device is buffered by the volume generated by the movement of the buffer piston, so that the buffer effect is poor, and the protection effect of buffering overflow cannot be better played. The disadvantages of the prior art are as follows:
the buffer piston can directly bear the fluctuation impact of oil pressure force, has two matching surfaces, is easy to generate abrasion and clamping stagnation, has higher matching precision on the shell and the overflow valve sleeve, and is easy to damage and difficult to repair due to abrasion of the shell;
in the moving process of the overflow valve core, the requirement on the fit clearance between the overflow valve core and the overflow valve sleeve is higher;
the buffer piston is not adjustable, so the buffer time is fixed;
the casing oil duct is complicated, and the processing degree of difficulty increases, and overflow buffer occupies the casing space great simultaneously, can lead to whole mechanism size increase.
The overflow valve is designed in a split mode, the installation is complex, and the O-shaped ring between the part and the motor shell is sealed, so that risks exist; the structure is complex.
The safety valve of the embodiment is provided with the first throttling hole, the second throttling hole and the buffering piston 12, so that secondary throttling and buffering functions are achieved, pressure fluctuation and impact can be fully eliminated in the arrangement mode, pressure impact during reversing of the motor is avoided, stability and safety of the working process of the motor are guaranteed, the structure is simple, the size is small, and therefore the safety valve has outstanding economic benefits.
Optionally, in this embodiment, the elastic member is a spring 6. The spring 6 has simple structure, reliable elasticity, standard component and low cost. It should be noted that, in other embodiments of the present invention, the elastic member may also be an elastic wire, rubber, or the like, which is not limited herein.
Further, in the present embodiment of the present invention, the throttle opening of the second throttle hole is adjustable. The second throttle hole is set as a variable throttle for adjusting the damping time. So can adjust the state of relief valve under different operating modes and the condition effectively to make the motor can adapt to more operating condition.
In this embodiment, the valve body comprises a main valve seat 7, a main valve sleeve 11 and a bushing 1; the bush 1 is arranged at one end of the main valve seat 7, and the main valve sleeve 11 is arranged at the other end of the main valve seat 7; the cone valve core 2, the slide valve core 3 and the elastic element are arranged in the main valve seat 7, and the buffer piston 12 is arranged in the main valve sleeve 11; the oil return opening of the valve body is arranged on the main valve seat 7, and the oil inlet of the valve body is arranged on the bushing 1.
The valve body comprises a main valve seat 7, a main valve sleeve 11 and a bushing 1 respectively, so that the whole structure of the valve body is simpler, the valve body is simple to manufacture, the valve body is convenient to assemble, the whole occupied space is smaller, and the economic benefit is outstanding.
As can be seen, the end of the spring 6 is held against the end of the main valve sleeve 11 by a washer 8.
Optionally, in this embodiment, the end of the bushing 1 away from the main valve seat 7 has a first conical surface, and the first conical surface is connected with the motor port.
The bushing 1 is sealed with the motor conical surface, so that the safety valve is stably connected with the motor, and the conical surface is good in sealing effect, simple in structure and small in occupied space.
It should be noted that the sealing between the bushing 1 and the motor cone is only an example, and in other embodiments of the present invention, the bushing 1 can be other sealing methods, which is not limited herein.
In the present embodiment of the present invention, the bushing 1 is connected to the main valve seat 7 in an interference manner. The bush 1 and the main valve seat 7 are in interference connection, so that the stable connection of the bush and the main valve seat 7 can be guaranteed, and meanwhile, the sealing performance of the main valve seat 7 is guaranteed.
Optionally, in the present embodiment of the present invention, the end of the main valve seat 7 close to the bushing 1 has a second tapered surface, and the second tapered surface is connected to the oil inlet on the bushing 1. The sealing performance between the main valve seat 7 and the bush 1 can be obviously improved by adopting a conical surface sealing mode.
It should be noted that the conical sealing between the main valve seat 7 and the bushing 1 is only an example, and in other embodiments of the present invention, the bushing 1 can be sealed in other sealing manners, which is not limited herein.
In the present embodiment of the present invention, the valve body further includes a first sealing member 10, and the spool 3 and the main valve housing 11 are sealed by the first sealing member 10. The first sealing element 10 guarantees the sealing performance between the spool 3 and the main valve sleeve 11, and guarantees the stability of the whole structure of the safety valve.
Optionally, the first seal 10 is an O-ring. In other embodiments of the present invention, the first sealing member 10 may have other structures, which are not limited herein.
Furthermore, as can be seen from the figure, the end of the first sealing element 10 close to the spool 3 is also provided with a first retaining ring 9, and the first retaining ring 9 and the first sealing element 10 jointly ensure the sealing of the spool 3 with the main valve sleeve 11.
In the present embodiment of the present invention, the valve body further includes a threaded sleeve 13; the threaded sleeve 13 is arranged at the end of the main valve seat 7 close to the main valve sleeve 11, and the threaded sleeve 13 seals the main valve seat 7 and the main valve sleeve 11 at the same time. The threaded sleeve 13 is connected with the main valve sleeve 11, so that the whole valve body is covered, and the stability and the reliability of the whole structure are guaranteed.
In the present embodiment of the present invention, the threaded sleeve 13 is connected to the main valve sleeve 11 by a screw. The threaded connection has the characteristics of simple structure and convenience in operation, and the sealing performance is outstanding.
It can also be seen that the outside of the main valve seat 7 is also provided with a second seal 4 and a second collar 5.
During assembly, the bush 1 is communicated with an oil port of the motor and is connected with the oil port of the motor through a conical surface; the bush 1 is connected with a main valve seat 7 (interference connection) and a conical valve core 2 (conical surface contact); the conical valve core 2 is in sliding connection with the main valve seat 7 and the sliding valve core 3, and is in clearance fit with the main valve seat, the conical valve core 2 is tightly attached to the lining 1 rightwards under the action of the force of the spring 6, and the pressure rises and slides leftwards against the force of the spring 6; the sliding valve core 3 is connected with the main valve sleeve 11 and sealed by an O-shaped ring; the main valve sleeve 11 is in clearance fit with the buffer piston 12, and can slide when being pushed by hydraulic oil; the threaded sleeve 13 is in threaded connection with the main valve sleeve 11 and covers the whole valve.
When the hydraulic buffer valve is used, hydraulic oil enters from an oil inlet (a port P), flows into the inner cavity of the slide valve core 3 through the throttling hole on the cone valve core 2, flows into the main valve sleeve 11 through the throttling hole (the hole is adjustable) on the slide valve core 3, and then pushes the buffer piston 12 to move leftwards;
in the process, due to the flowing of oil, pressure difference exists before and after the throttling hole of the conical valve core 2, when the pressure is greater than the set pressure, the conical valve core 2 is opened, and high-pressure oil has an oil inlet (P port) and flows to an oil return port (T port), so that the motor is protected;
when the buffer piston 12 moves to the leftmost side, the cone valve core 2 is closed, and the process is a buffer process;
when the pressure is further increased to reach the set pressure of the safety valve, the pressure oil in the oil inlet (P port) pushes the conical valve core 2 open, and the pressure oil directly flows out of the oil return port (T port) from the oil inlet (P port), so that the motor is protected.
In a second aspect, an embodiment of the present invention provides a construction machine including the safety valve according to any one of the preceding embodiments. The engineering machinery has the advantages of simple structure, convenience in operation, stability in operation and outstanding economic benefit.
Such a construction machine achieves the following effects:
1) a plug-in type safety valve is designed on the traveling motor;
2) the safety valve is designed to be a constant pressure safety valve, so that the fault caused by overhigh motor pressure due to manual adjustment is avoided;
3) the safety valve has a buffer function, and pressure impact is avoided when the motor is reversed;
4) the buffer piston 12 of the safety valve is embedded into the inner side of the overflow valve sleeve, and only one matching surface which slides relatively is arranged, so that the abrasion is reduced;
3) the valve core is provided with a through small hole for throttling, so that pressure fluctuation and impact can be fully eliminated;
4) the seal between the overflow valve and the motor is a conical surface seal, so that the seal is reliable;
5) the overflow valve core adopts secondary throttling, and the second throttling hole is set to variable throttling and used for adjusting the buffering time.
The safety valve and the engineering machinery provided by the embodiment have at least the following advantages:
the maintenance is convenient; the service life is long; the structure is simple, and the highly integrated volume is small; the processing technology is simplified.
The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A safety valve for connection to a motor, comprising:
the valve comprises a valve body, a sliding valve core, a conical valve core, an elastic piece and a buffer piston, wherein the sliding valve core, the conical valve core, the elastic piece and the buffer piston are movably arranged in the valve body;
the cone valve core is movably connected with the sliding valve core, and the end part of the sliding valve core and the cone valve core enclose to form a sealed first space;
the end part of the buffer piston close to the slide valve core and the valve body form a sealed second space;
an inlet of the conical valve core is used for being connected with an oil inlet of the valve body, and an outlet of the conical valve core is connected with the first space through a first throttling hole;
the elastic piece provides elastic force to enable the cone valve core to move so as to seal an oil return port of the valve body;
the first space extends to a second space through an inner cavity of the spool, and the spool is connected with the second space through a second orifice.
2. The safety valve of claim 1, wherein:
the throttle opening degree of the second throttle hole is adjustable.
3. The safety valve of claim 1, wherein:
the valve body comprises a main valve seat, a main valve sleeve and a lining;
the bushing is arranged at one end of the main valve seat, and the main valve sleeve is arranged at the other end of the main valve seat; the cone valve core, the slide valve core and the elastic piece are arranged in the main valve seat, and the buffer piston is arranged in the main valve sleeve;
the oil return port of the valve body is arranged on the main valve seat, and the oil inlet of the valve body is arranged on the bushing.
4. The safety valve of claim 3, wherein:
the end part, far away from the main valve seat, of the bushing is provided with a first conical surface, and the first conical surface is connected with a motor oil port.
5. The safety valve of claim 3, wherein:
the bushing is in interference connection with the main valve seat.
6. The safety valve of claim 3, wherein:
the end part, close to the lining, of the main valve seat is provided with a second conical surface, and the second conical surface is connected with the oil inlet on the lining.
7. The safety valve of claim 3, wherein:
the valve body further comprises a first sealing element, and the spool and the main valve sleeve are sealed through the first sealing element.
8. The safety valve of claim 3, wherein:
the valve body also comprises a threaded sleeve;
the thread sleeve is arranged at the end part of the main valve seat close to the main valve sleeve, and the thread sleeve seals the main valve seat and the main valve sleeve simultaneously.
9. The safety valve of claim 8, wherein:
the threaded sleeve is in threaded connection with the main valve sleeve.
10. A construction machine characterized in that:
the working machine comprising a safety valve according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020515419.1U CN211820155U (en) | 2020-04-09 | 2020-04-09 | Safety valve and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020515419.1U CN211820155U (en) | 2020-04-09 | 2020-04-09 | Safety valve and engineering machinery |
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| Publication Number | Publication Date |
|---|---|
| CN211820155U true CN211820155U (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020515419.1U Active CN211820155U (en) | 2020-04-09 | 2020-04-09 | Safety valve and engineering machinery |
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| Country | Link |
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| CN (1) | CN211820155U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294287A (en) * | 2021-12-30 | 2022-04-08 | 靖江市穹顶安防工程有限责任公司 | Buffering overflow valve structure |
-
2020
- 2020-04-09 CN CN202020515419.1U patent/CN211820155U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294287A (en) * | 2021-12-30 | 2022-04-08 | 靖江市穹顶安防工程有限责任公司 | Buffering overflow valve structure |
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