CN220378584U - Oil return valve, oil return system and operation machine - Google Patents
Oil return valve, oil return system and operation machine Download PDFInfo
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- CN220378584U CN220378584U CN202321844190.6U CN202321844190U CN220378584U CN 220378584 U CN220378584 U CN 220378584U CN 202321844190 U CN202321844190 U CN 202321844190U CN 220378584 U CN220378584 U CN 220378584U
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- 230000000903 blocking effect Effects 0.000 claims description 74
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- 239000003921 oil Substances 0.000 description 321
- 239000010720 hydraulic oil Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 8
- 239000012188 paraffin wax Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
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- 238000012546 transfer Methods 0.000 description 3
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- 230000006835 compression Effects 0.000 description 2
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Abstract
The utility model relates to the technical field of engineering machinery and provides an oil return valve, an oil return system and an operation machine, wherein the oil return valve comprises a valve body, a through hole, a valve core and a driving piece, and the valve body is provided with an oil inlet communicated with a hydraulic system, a first oil outlet communicated with an oil tank and a second oil outlet communicated with the oil tank through a radiator; the oil inlet can be communicated with the first oil outlet and the second oil outlet respectively, the through hole and the valve core are arranged in the valve body, and the through hole is used for communicating the oil inlet and the second oil outlet; the driving piece drives the valve core to move from the first position to the second position, the driving piece comprises a thermosensitive medium, and the thermosensitive medium is arranged in the valve core and is deformed to provide power for the valve core according to the temperature change of oil in the valve body; the valve core is positioned at the first position to block the through hole; when the valve core is positioned at the second position, the first oil outlet is blocked. The flow rate of the oil liquid distributed to the radiator can be independently decided according to the current oil temperature of the hydraulic return oil of the hydraulic system, so that the oil temperature of the hydraulic system can be better controlled, and the efficiency of the hydraulic system is improved.
Description
Technical Field
The utility model relates to the technical field of engineering machinery, in particular to an oil return valve, an oil return system and an operation machine.
Background
Hydraulic systems are generally composed of power elements, control elements, actuators, working media, auxiliary elements such as tanks, pipes, radiators, filters, etc. The hydraulic system can be divided into an open system and a closed system, and the working temperature of hydraulic oil return in the hydraulic system is preferably 30-50 ℃, the maximum oil temperature of heavy machinery is not more than 85 ℃, and the minimum oil temperature is not less than 15 ℃. Too high oil temperature can reduce the viscosity of hydraulic oil, increase leakage of a hydraulic system and reduce the efficiency of the system; too low an oil temperature increases the viscosity of the hydraulic oil, and the pressure loss of the oil flow increases, resulting in a decrease in the working efficiency of the hydraulic system.
The hydraulic system is low in oil temperature at the initial stage of starting up, the oil temperature rises after a certain period of working, the oil temperature cannot be controlled within 85 ℃ by means of natural cooling, and a cooler is needed to be added, so that the oil return of the hydraulic system has the following three conditions: (1) All hydraulic return oil flows back to the oil tank at the initial working stage (so as to realize rapid increase of the oil temperature to a proper working zone); (2) The hydraulic oil return part flows back to the oil tank in the middle working period, and part flows through the radiator (so as to maintain the oil temperature in a proper working range); (3) When working for a long time or heavy load, hydraulic return oil completely flows through the radiator (so as to maintain the oil temperature in a proper working range).
In order to solve the problems, part of components of the existing hydraulic system are scattered, some pipelines are directly connected back to a hydraulic oil return tank, some pipelines are connected back to the oil return tank through a radiator, and the pipeline arrangement is relatively complicated; moreover, the cooling flow of the hydraulic return oil cannot be distributed and controlled according to the current oil temperature, so that the efficiency loss of the hydraulic system is larger.
Disclosure of Invention
The utility model provides an oil return valve, an oil return system and an operation machine, which are used for solving the problems that in the prior art, part of components of a hydraulic system are scattered, some pipelines are directly connected with an oil return tank, some pipelines are connected with the oil return tank through a radiator, and the pipeline arrangement is relatively complicated; and the defect that the efficiency loss of the hydraulic system is larger due to the fact that the cooling flow of the hydraulic return oil cannot be distributed and controlled according to the current oil temperature.
The utility model provides an oil return valve, comprising:
the oil inlet is used for being communicated with a hydraulic system of the working machine, the first oil outlet is used for being communicated with an oil return port of an oil tank of the working machine, and the second oil outlet is communicated with the oil return port of the oil tank through a radiator;
the through hole is arranged in the valve body and is used for communicating the oil inlet with the second oil outlet;
the valve core is arranged in the valve body;
the driving piece is used for driving the valve core to move from the first position to the second position, and comprises a thermosensitive medium which is arranged in the valve core and is used for providing power for the valve core according to the temperature change deformation of oil in the valve body;
when the valve core is positioned at the first position, the valve core seals the through hole; when the valve core is positioned at the second position, the valve core seals the first oil outlet.
According to the oil return valve provided by the utility model, the driving piece further comprises:
the first end of the ejector rod is propped against the valve body, and the second end of the ejector rod stretches into the valve core to be in contact with the thermosensitive medium.
According to the utility model, the oil return valve further comprises:
the first elastic piece is used for driving the valve core to return to the first position from the second position, the first end of the first elastic piece is connected with or propped against the valve core, the second end of the first elastic piece is connected with or propped against the valve body, and the elastic force of the first elastic piece is smaller than the expansion force of the thermosensitive medium.
According to the oil return valve provided by the utility model, the valve core comprises:
the first blocking piece is used for blocking the through hole;
the second blocking piece is used for blocking the first oil outlet;
the connecting rod is used for connecting the first blocking piece and the second blocking piece, and the thermosensitive medium is arranged in the connecting rod.
According to the oil return valve provided by the utility model, the through hole and/or the first blocking piece are in a conical structure, the first blocking piece can extend into the through hole, and the maximum diameter of the first blocking piece is larger than the minimum aperture of the through hole.
According to the oil return valve provided by the utility model, the first oil outlet comprises a conical hole, the second blocking piece can extend into the conical hole, and the maximum diameter of the second blocking piece is larger than the minimum aperture of the conical hole;
and/or the number of the groups of groups,
the second blocking piece comprises a conical part, the conical part can extend into the first oil outlet, and the maximum diameter of the conical part is larger than the caliber of the first oil outlet.
According to the utility model, the oil return valve further comprises:
the fixed support is arranged in the valve body, the first end of the fixed support is connected with the valve body, the second end of the fixed support is propped against or connected with the first elastic piece, and the second end of the fixed support is in sliding connection with the valve core.
The utility model also provides an oil return system comprising the oil return valve.
According to the oil return system provided by the utility model, the valve body of the oil return valve is provided with the third oil outlet, and the third oil outlet is communicated with the oil inlet of the valve body;
the oil return system further includes:
the first end of the first one-way valve is communicated with a first oil outlet of the oil return valve, the second end of the first one-way valve is communicated with an oil return port of an oil tank, and the conduction direction of the first one-way valve is consistent with the direction from the first end to the second end of the first one-way valve;
the first end of the second one-way valve is communicated with the second oil outlet of the oil return valve, the second end of the second one-way valve is communicated with the radiator, and the conduction direction of the second one-way valve is consistent with the direction from the first end to the second end of the second one-way valve;
the first end of the third one-way valve is communicated with the third oil outlet, the second end of the third one-way valve is communicated with an oil return port of the oil tank, and the conduction direction of the third one-way valve is consistent with the direction from the first end to the second end of the third one-way valve; and the opening pressure of the third one-way valve is larger than the opening pressures of the first one-way valve and the second one-way valve, and the opening pressure of the third one-way valve is smaller than or equal to the police backpressure.
The utility model also provides a working machine comprising an oil return valve as claimed in any one of the preceding claims or an oil return system as claimed in any one of the preceding claims.
The utility model provides an oil return valve, an oil return system and an operation machine, wherein the oil return valve comprises a valve body, a valve plate, a valve core and a driving piece, the valve body is provided with an oil inlet, a first oil outlet and a second oil outlet, the first oil outlet and the second oil outlet can be respectively communicated with the oil inlet, the oil inlet is used for being communicated with a hydraulic system of the operation machine, and the first oil outlet is used for being communicated with an oil return port of an oil tank of the operation machine so that hydraulic oil of the hydraulic system can directly flow back to the oil tank; the second oil outlet is communicated with an oil return port of the oil tank through the radiator, so that hydraulic oil of the hydraulic system flows into the oil return tank after being cooled by the radiator; the valve plate is arranged in the valve body, a through hole is formed in the valve plate and is used for communicating the oil inlet and the second oil outlet, so that hydraulic oil return of the hydraulic system flows out through the second oil outlet after passing through the through hole, the valve core is arranged in the valve body, the valve core can move along the axial direction of the through hole, and the valve core can be switched between the plugging through hole and the first oil outlet, namely the valve core is switched between the plugging of the second oil outlet and the first oil outlet; the driving piece is used for driving the valve core to move from the first position to the second position, when the valve core is positioned at the first position, the valve core seals the through hole so that the oil inlet cannot be communicated with the second oil outlet, at the moment, the oil inlet is communicated with the first oil outlet, and hydraulic return oil can flow back to the oil tank through the first oil outlet; when the valve core is positioned at the second position, the valve core seals the first oil outlet, at the moment, the through hole is communicated with the oil inlet and the second oil outlet, and hydraulic return oil can flow back to the oil tank after being cooled by the radiator through the second oil outlet.
The driving piece comprises a thermosensitive medium which is arranged in the valve core and is used for expanding with heat and contracting with cold according to the temperature change of oil in the valve body, so that power can be provided for the valve core, the valve core can be moved from a first position to a second position, and switching connection between the oil inlet and the first and second oil outlets is realized. The heat-sensitive medium can provide power for the movement of the valve core according to the oil temperature of the hydraulic return oil entering the valve body, so that the oil return valve can autonomously decide the oil flow distributed to the radiator according to the current oil temperature of the hydraulic return oil of the hydraulic system, the oil temperature of the hydraulic system can be better controlled, and the efficiency of the hydraulic system is improved.
The valve core is used for axially closing or opening the through hole, so that the second oil outlet can be closed or opened, and leakage of oil through the second oil outlet can be effectively avoided, and the temperature of the oil cannot be kept in a proper working interval.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an oil return system according to the present utility model;
FIG. 2 is a schematic diagram of an oil return valve (when the valve core is in the first position, the heat sensitive medium is in the solid state);
FIG. 3 is a second schematic diagram of the oil return valve (when the valve core is at the first position, the heat sensitive medium is in solid state);
FIG. 4 is a schematic diagram of an oil return valve (when the valve core moves from the first position to the second position, the heat sensitive medium is in the phase change region);
FIG. 5 is a second schematic diagram of the oil return valve (when the valve core moves from the first position to the second position, the heat sensitive medium is in the phase change region));
FIG. 6 is a schematic diagram of an oil return valve (when the valve core is in the second position, the heat sensitive medium is in the liquid state);
FIG. 7 is a schematic diagram of a structure of the oil return valve according to the present utility model, wherein the heat sensitive medium is in a liquid state when the two valve cores are located at the second position;
fig. 8 is a schematic diagram of a valve core assembly (including a valve core, a driving member, a valve plate, an elastic member, etc.) of the oil return valve provided by the utility model.
Reference numerals:
1. a hydraulic system; 2. an oil tank; 3. a heat sink;
4. an oil return valve; 5. a first one-way valve; 6. a second one-way valve;
7. a third one-way valve; 41. a valve body; 42. an oil inlet;
43. a first oil outlet; 44. a second oil outlet; 45. a valve core;
46. a valve plate; 47. a push rod; 48. a first elastic member;
49. a second elastic member; 410. a fixed bracket; 411. a through hole;
451. a first blocking member; 452. a connecting rod; 453. a second blocking member;
454. an inner cavity.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The oil return valve, the oil return system, and the work machine of the present utility model are described below with reference to fig. 1 to 8.
The utility model provides an oil return valve which can comprise a valve body 41, a valve core 45 and a driving piece.
The valve body 41 may be provided with an oil inlet 42, a first oil outlet 43 and a second oil outlet 44, where the first oil outlet 43 and the second oil outlet 44 may be respectively capable of communicating with the oil inlet 42, the oil inlet 42 may be used to communicate with the hydraulic system 1 of the working machine, and the first oil outlet 43 may be used to communicate with an oil return port of the oil tank 2 of the working machine, so that hydraulic return oil of the hydraulic system 1 may directly flow back to the oil tank 2; the second oil outlet 44 may be connected to an oil return port of the oil tank 2 through the radiator 3, so that the hydraulic oil returned from the hydraulic system 1 flows into the oil return tank 2 after being cooled by the radiator 3, so as to maintain the oil temperature of the hydraulic oil return within a suitable working range.
The oil return valve further comprises a through hole 411, the through hole 411 can be arranged in the valve body 41, and the through hole 411 can be used for communicating the oil inlet 42 and the second oil outlet 44, so that hydraulic oil return of the hydraulic system 1 can flow out through the second oil outlet 44 after passing through the through hole 411.
The valve core 45 may be disposed in the valve body 41, and the valve core 45 may be movable in the axial direction of the through hole 411, and the valve core 45 may be switchable between blocking the through hole 411 and the first oil outlet 43, i.e., the valve core 45 may be switchable between blocking the second oil outlet 44 and the first oil outlet 43 to control the hydraulic return oil to pass through the radiator 3 in whole or in part, so that the temperature of the hydraulic return oil may be maintained within a suitable working interval.
And, the driving piece can be used for driving the valve core 45 to move from the first position to the second position, so that the oil inlet 42 can be switched to be communicated with the first oil outlet 43 and the second oil outlet 44.
Here, when the valve core 45 is located at the first position, the valve core 45 may axially block the through hole 411, so that the oil inlet 42 cannot communicate with the second oil outlet 44, and at this time, the oil inlet 42 communicates with the first oil outlet 43, and the hydraulic return oil may all flow back to the oil tank 2 through the first oil outlet 43; when the valve core 45 is located at the second position, the valve core 45 can seal the first oil outlet 43, at this time, the through hole 411 is communicated with the oil inlet 42 and the second oil outlet 44, and hydraulic return oil can flow back to the oil tank 2 after being cooled by the radiator 3 through the second oil outlet 44.
It should be noted that, in the process of moving the valve core 45 from the first position to the second position, that is, when the valve core 45 is located between the first position and the second position, the oil inlet 42 may be respectively communicated with the first oil outlet 43 and the through hole 411, so that hydraulic oil return may respectively pass through the first oil outlet 43 and the second oil outlet 44, a part of hydraulic oil return may directly flow back to the oil tank 2 through the first oil outlet 43, and another part may flow back to the oil tank 2 after being radiated by the radiator 3 through the second oil outlet 44, so that the oil temperature of hydraulic oil return is maintained within a suitable working interval.
The through hole 411 is axially closed or opened by the valve core 45, so that the second oil outlet 44 can be closed or opened, and leakage of oil through the second oil outlet 44 can be effectively avoided, so that the temperature of the oil cannot be kept in a proper working interval.
In addition, the driving member may include a heat-sensitive medium, and the heat-sensitive medium may be disposed in the valve core 45, and the heat-sensitive medium may be used for thermal expansion and cold-contraction deformation according to a temperature change of the oil in the valve body 41, so as to provide power for the valve core 45, so that the valve core 45 may move from the first position to the second position, and realize switching conduction between the oil inlet 42 and the first oil outlet 43 and the second oil outlet 44.
Here, the thermosensitive medium may be a thermosensitive paraffin medium.
Specifically, when the heat-sensitive medium expands to the first state, the driving member may drive the valve core 45 to move from the first position to the second position, so that the oil inlet 42 may be respectively communicated with the through hole 411 and the first oil outlet 43, even though the oil inlet 42 may be respectively communicated with the second oil outlet 44 and the first oil outlet 43, so that a part of the hydraulic return oil may directly flow back to the oil tank 2 through the first oil outlet 43, and another part may flow back to the oil tank 2 through the second oil outlet 44 after being cooled by the radiator 3, so as to ensure that the temperature of the hydraulic return oil is kept within a suitable working interval.
When the heat sensitive medium expands to the second state, the driving member may drive the valve core 45 to move to the second position, so that the valve core 45 closes the first oil outlet 43, and the oil inlet 42 is communicated with the through hole 411, even if the oil inlet 42 is communicated with the second oil outlet 44. In this way, the hydraulic return oil can be made to flow entirely through the second oil outlet 44 and back to the oil tank 2 after being cooled by the radiator 3.
When the thermal medium is not expanded or is less expanded, i.e. the thermal medium is in a solid state region, the valve core 45 is kept at the first position, the valve core 45 seals the through hole 411, and the oil inlet 42 is communicated with the first oil outlet 43, so that hydraulic return oil can directly flow back to the oil tank 2 through the first oil outlet 43.
It should be noted that, the first state of the heat-sensitive medium may be a state in the phase change region, i.e. a solid-liquid mixed state; the second state of the thermal medium may be a state in a liquid state; when the oil temperature of the hydraulic oil return is more than 43 ℃ and less than 60 ℃, the thermosensitive medium can be expanded to a first state; when the oil temperature of the hydraulic return oil is higher than 60 ℃, the thermosensitive medium can be expanded to a second state; when the temperature of the hydraulic return oil is less than 43 ℃, the thermosensitive medium is in a solid region.
In this way, the thermosensitive medium can provide power for the movement of the valve core 45 according to the oil temperature of the hydraulic return oil entering the valve body 41, so that the oil return valve 4 can autonomously decide the oil flow distributed to the radiator 3 according to the current oil temperature of the hydraulic return oil of the hydraulic system 1, the oil temperature of the hydraulic system 1 can be better controlled, and the efficiency of the hydraulic system 1 is improved.
In an alternative embodiment, the valve body may include a first valve body and a second valve body, between which the valve plate 46 may be disposed, the through hole 411 may be disposed on the valve plate 46, and the first oil outlet 43 may be disposed at an end of the first valve body remote from the second valve body, the oil inlet 42 may be disposed at a side of the first valve body, and the second oil outlet 44 may be disposed at a side of the second valve body.
In an alternative embodiment of the utility model, the driving member may further comprise a push rod 47, a first end of the push rod 47 may abut against the valve body 41, and a second end of the push rod 47 may extend into the valve core 45 to contact the heat sensitive medium. In this way, the thermal medium can transfer the expansion deformation force to the ejector rod 47 after being expanded and deformed by the heat of the oil, and the ejector rod 47 transfers the reaction force to the thermal medium due to the limitation of the valve body 41 to the ejector rod 47, the thermal medium transfers the reaction force to the valve core 45, and the valve core 45 is forced to move from the first position to the second position.
In an alternative embodiment, the valve core 45 may have an inner cavity 454, the thermal medium may be disposed in the inner cavity 454, and the second end of the ejector 47 may extend into the inner cavity 454 to contact the thermal medium.
Here, the first end of the ejector rod 47 may abut against or be connected to the second end wall of the valve body 41, which may be an end wall of the valve body 41 near the second oil outlet 44, and the second end of the ejector rod 47 may extend into the inner cavity 454 of the valve core 45 through the through hole 411; also, the first oil outlet 43 may be provided on a first end wall of the valve body 41, and the first end wall and the second end wall may be two opposite end walls of the valve body 41.
In an alternative embodiment of the present utility model, the oil return valve 4 may further include a first elastic member 48, where the first elastic member 48 may be used to drive the valve core 45 to return from the second position to the first position, so that the valve core 45 may be restored, specifically, a first end of the first elastic member 48 may be connected to or abutted against the valve core 45, and a second end of the first elastic member 48 may be used to be connected to or abutted against the valve body 41. Thus, when the heat sensitive medium is contracted by low temperature, the first elastic piece 48 can drive the valve core 45 to reset, the through hole 411 is blocked, and the hydraulic return oil flows back to the oil tank 2 only through the first oil outlet 43.
Here, the elastic force of the first elastic member 48 may be smaller than the expansion force of the heat sensitive medium.
In an alternative embodiment of the present utility model, the valve cartridge 45 may include a first blocking member 451, a second blocking member 453, and a connection rod 452, the first blocking member 451 may be used to block the through hole 411, the second blocking member 453 may be used to block the first oil outlet 43, the connection rod 452 may be used to connect the first blocking member 451 and the second blocking member 453, and a heat-sensitive medium may be disposed in the connection rod 452.
Here, the lumen 454 may be provided on the connection rod 452.
In an alternative embodiment, the first oil outlet 43 and the through hole 411 are coaxially disposed, and the first and second stoppers 451 and 453 may be coaxially disposed. In this way, the valve core 45 is convenient to block the through hole 411 or the first oil outlet 43, and the first blocking member 451 and the second blocking member 453 can axially block the through hole 411 and the first oil outlet 43 respectively, and a sliding gap does not exist between the valve body 41 and the first blocking member 451 and the second blocking member 453, so that oil leakage can be effectively avoided.
In alternative embodiments, the through-hole 411 and/or the first blocking member 451 may have a tapered configuration, and the first blocking member 451 may be capable of extending into the through-hole 411, and the maximum diameter of the first blocking member 451 may be greater than the minimum aperture of the through-hole 411.
Specifically, in the first manner, the through hole 411 may have a tapered structure, that is, the through hole 411 may be a tapered hole, the first blocking member 451 may extend into the tapered hole, and the diameter of the first blocking member 451 may be greater than the minimum diameter of the tapered hole, so that the first blocking member 451 may completely close the through hole 411.
In the second manner, the first blocking member 451 may have a tapered structure, the first blocking member 451 may be capable of extending into the through hole 411, and the maximum diameter of the first blocking member 451 may be larger than the aperture of the through hole 411, so that the first blocking member 451 may completely close the through hole 411.
In a third manner, the through hole 411 and the first blocking member 451 may have a tapered structure, the first blocking member 451 may extend into the through hole 411, and the maximum diameter of the first blocking member 451 may be greater than the minimum diameter of the through hole 411, so that the first blocking member 451 may completely close the through hole 411.
Thus, the through hole 411 and the first blocking piece 451 can be sealed by a conical surface, the through hole 411 can be completely blocked, the tightness of the first blocking piece 451 after blocking the through hole 411 is improved, the sealing is more reliable, and the oil can be effectively prevented from leaking from the through hole 411.
Here, the diameter of the first blocking member 451 and/or the through hole 411 gradually decreases in a direction away from the second blocking member 453.
In addition, in the first embodiment, the first oil outlet 43 may include a tapered hole, the second blocking member 453 may extend into the tapered hole, and the diameter of the second blocking member 453 may be greater than the minimum diameter of the tapered hole, so that the second blocking member 453 completely blocks the first oil outlet 43.
In a second embodiment, second blocking member 453 may include a tapered portion that may extend into first oil outlet 43, and the maximum diameter of the tapered portion may be greater than the caliber of first oil outlet, such that second blocking member 453 may completely block first oil outlet 43.
In a third embodiment, first oil outlet 43 may include a tapered hole, second blocking member 453 may include a tapered portion, the tapered portion may extend into the tapered hole, and a maximum diameter of the tapered portion may be greater than a minimum aperture of the tapered hole, such that second blocking member 453 may completely block first oil outlet 43.
In this way, the second blocking member 453 can be ensured to completely block the first oil outlet 43, so that the first oil outlet 43 and the second blocking member 453 are sealed by a conical surface, and leakage of hydraulic oil return from the first oil outlet 43 during oil return through the second oil outlet 44 can be avoided.
In an alternative embodiment of the present utility model, the oil return valve 4 may further include a fixing bracket 410, the fixing bracket 410 may be disposed within the valve body 41, and a first end of the fixing bracket 410 may be connected with the valve body 41, in particular, a first end of the fixing bracket 410 may be connected with the valve plate 46, and a second end of the fixing bracket 410 may be abutted or connected with a second end of the first elastic member 48. Therefore, the first elastic member 48 can be limited, so that the first elastic member 48 can be triggered in the process of moving the valve core 45 from the first position to the second position, and the first elastic member 48 is deformed, so that the first elastic member 48 can drive the valve core 45 to return to the first position when the heat-sensitive medium contracts.
Here, the second end of the fixing bracket 410 may be slidably coupled to the valve body 45, so that the fixing bracket 410 may be prevented from obstructing the movement of the valve body 45.
In an alternative embodiment, the first elastic member 48 may be sleeved outside the connecting rod 452, and a first end of the first elastic member 48 may abut against or be connected with the first blocking member 451, and a second end of the second elastic member 49 may abut against or be connected with a second end of the fixing bracket 410. Thus, when the valve element 45 moves from the first position to the second position, the first elastic member 48 can be deformed by the pressing force of the first blocking member 451; when the force of the first elastic member 48 is removed, the first elastic member 48 can restore the deformation to push the first blocking member 451 to move reversely, so as to push the valve core 45 to move towards the first position.
In an alternative embodiment, the oil return valve 4 may further include a second elastic member 49, where the second elastic member 49 may be sleeved outside the connecting rod 452, and a second end of the second elastic member 49 may abut or be connected with the second blocking member 453, and a first end of the second elastic member 49 may abut against a second end of the fixing bracket 410.
Specifically, when the valve element 45 is located at the second position, the first end of the second elastic member 49 may abut against the second end of the first rod portion, and the second elastic member 49 may be placed in a compression deformation state. Thus, when the oil temperature of the hydraulic return oil is high, and the expansion rate of the heat sensitive medium is high, the second elastic member 49 is compressed when the valve core 45 moves down to the bottom dead center, and a certain pre-compression force is provided for the second blocking member 453, so as to reduce the hysteresis of the valve core 45 when the oil temperature is reduced.
It should be noted that, the first elastic member 48 and the second elastic member 49 may be springs.
In alternative embodiments, the fixed bracket 410 may include a plurality of bent rods, a first end of each of which is coupled to the valve plate 46, a second end of each of which may be in contact with the connecting rod 452, and which may be disposed around the valve core 45.
Also, the connection rod 452 may include a first rod portion and a second rod portion, a first end of the first rod portion may be connected with the first blocking member 451, a first end of the second rod portion may be connected with a second end of the first rod portion, and a second end of the second rod portion may be connected with the second blocking member 453, where the first rod portion and the second rod portion may be in an integrated structure.
Here, the second end of the bent rod may be in end-face contact with the second end of the first rod portion, the diameter of the first rod portion may be larger than the diameter of the second rod portion, and the second end of the first rod portion may be provided with a rounded chamfer so that the first rod portion is facilitated to pass through the holes surrounded by the second ends of the plurality of bent rods when the valve core 45 is moved from the first position to the second position.
In the initial stage of starting the working machine, when the temperature of the oil does not reach the optimal operation temperature of the system, for example, the hydraulic return oil temperature is lower than 43 ℃, the hydraulic return oil of the hydraulic system 1 can enter the valve body 41 from the oil inlet 42 of the return valve 4, the thermosensitive paraffin medium in the valve core 45 is in a solid phase crystal transformation stage, the expansion force of the thermosensitive paraffin medium is insufficient to overcome the pretightening force of the first elastic member 48, the valve core 45 is kept at the first position and does not move, as shown in fig. 2 and 3, the valve core 45 is positioned at the top dead center position, the first blocking member 451 of the valve core 45 blocks the through hole 411, and at the moment, the first oil outlet 43 is in a completely opened state, and the hydraulic return oil of the hydraulic system 1 completely flows back to the oil tank 2 through the first oil outlet 43;
as the operation time of the working machine is prolonged, the temperature of oil is gradually increased, the thermosensitive paraffin medium in the oil return valve 4 is in a solid-liquid phase transition area, the ejector rod 47 in fig. 4 and 5 is heated by the expansion force of the thermosensitive paraffin medium, because the top end of the ejector rod 47 is limited by the upper wall of the valve body 41, the valve core 45 is moved downwards by the reaction force of the ejector rod 47 against the pretightening force of the first elastic piece 48, at the moment, the position of the valve core 45 is shown in fig. 4-5, the first blocking piece 451 is far away from the through hole 411, so that the through hole 411 is opened, even if the through hole 411 is communicated with the oil inlet 42, as the valve core 45 moves downwards, the opening of the first oil outlet 43 is gradually reduced, and the opening of the through hole 411 is gradually increased; along with the continuous increase of the oil temperature, the proportion of the hydraulic return oil flowing through the radiator 3 through the second oil outlet 44 is gradually increased, the proportion of the hydraulic return oil directly flowing back to the oil tank 2 through the first oil outlet 43 is gradually reduced, and the oil temperature of the hydraulic system 1 is maintained to be stable in a proper working interval in the process, so that the efficient operation of the hydraulic system 1 is ensured; when the device is under the heavy load working condition, the valve core 45 continuously moves down to the bottom dead center, that is, the valve core 45 moves down to the second position, as shown in fig. 6 and 7, the second blocking member 453 of the valve core 45 is completely attached to the wall surface of the first oil outlet 43, at this time, the through hole 411 of the oil return valve 4 is completely opened, so that the channels of the oil inlet 42 and the second oil outlet 44 are completely opened, the channels of the oil inlet 42 and the first oil outlet 43 are blocked, and the hydraulic oil returns to the oil tank 2 after being completely cooled by the radiator 3.
The oil return valve provided by the utility model has the advantages of simple structure, easiness in processing and realization, higher reliability of the action of the oil return valve, wide applicable flow range and accurate oil flow distribution.
The oil return system provided by the utility model is described below, and the oil return system described below and the oil return valve described above can be referred to correspondingly.
The oil return system provided by the utility model can comprise the oil return valve 4 according to any one of the embodiments.
The beneficial effects achieved by the oil return system provided by the utility model are consistent with those achieved by the oil return valve provided by the utility model, and will not be described in detail herein.
In an alternative embodiment of the utility model, the valve body 41 of the oil return valve 4 may be provided with a third oil outlet, which may be in communication with the oil inlet 42 of the valve body 41. Specifically, the third oil outlet may be provided at a side portion of the first valve body of the valve body 41.
And, the oil return system may further include a first check valve 5, a second check valve 6, and a third check valve 7.
Wherein, the first end of the first one-way valve 5 can be communicated with the first oil outlet 43 of the oil return valve 4, and the second end of the first one-way valve 5 can be communicated with the oil return port of the oil tank 2;
a first end of the second check valve 6 may be in communication with the second oil outlet 44 of the oil return valve 4, and a second end of the second check valve 6 may be in communication with the radiator 3;
the first end of the third one-way valve 7 may be in communication with a third oil outlet, and the oil outlet of the third one-way valve 7 may be in communication with an oil return port of the oil tank 2.
The conducting direction of the first check valve 5 may be identical to the direction from the first end to the second end of the first check valve 5; the conducting direction of the second one-way valve 6 may be identical to the direction from the first end to the second end of the second one-way valve 6; the direction of conduction of the third check valve 7 may coincide with the direction from the first end to the second end of the third check valve 7.
Here, the opening pressure of the third check valve 7 is greater than the opening pressures of the first check valve 5 and the second check valve 6, and the opening pressure of the third check valve 7 is less than the guard back pressure. Like this, when the pressure of the hydraulic oil return of hydraulic system 1 is greater than the guard backpressure, third check valve 7 can open, makes the hydraulic oil return flow back to oil tank 2, realizes the pressure release to guarantee that the pressure of the hydraulic oil return of hydraulic system 1 is less than the guard backpressure all the time, guarantees that hydraulic system 1 operates safely and stably.
Here, the opening pressure means the minimum pressure at which the check valve starts to operate.
The present utility model will be described below with reference to a work machine, and the work machine described below and the oil return valve or oil return system described above may be referred to in correspondence with each other.
The utility model provides a working machine which can comprise the oil return valve according to any one of the embodiments or the oil return system according to the embodiment.
The beneficial effects achieved by the working machine provided by the utility model are consistent with those achieved by the oil return valve or the oil return system provided by the utility model, and are not repeated here.
The working machine may be an excavator, a pump truck, a crane, a loader, a rotary drilling machine, or other construction machines.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. An oil return valve, comprising:
the oil inlet is used for being communicated with a hydraulic system of the working machine, the first oil outlet is used for being communicated with an oil return port of an oil tank of the working machine, and the second oil outlet is communicated with the oil return port of the oil tank through a radiator;
the through hole is arranged in the valve body and is used for communicating the oil inlet with the second oil outlet;
the valve core is arranged in the valve body;
the driving piece is used for driving the valve core to move from the first position to the second position, and comprises a thermosensitive medium which is arranged in the valve core and is used for providing power for the valve core according to the temperature change deformation of oil in the valve body;
when the valve core is positioned at the first position, the valve core seals the through hole; when the valve core is positioned at the second position, the valve core seals the first oil outlet.
2. The oil return valve of claim 1 wherein the driver further comprises:
the first end of the ejector rod is propped against the valve body, and the second end of the ejector rod stretches into the valve core to be in contact with the thermosensitive medium.
3. The oil return valve according to claim 1, further comprising:
the first elastic piece is used for driving the valve core to return to the first position from the second position, the first end of the first elastic piece is connected with or propped against the valve core, the second end of the first elastic piece is connected with or propped against the valve body, and the elastic force of the first elastic piece is smaller than the expansion force of the thermosensitive medium.
4. The oil return valve of claim 1, wherein the spool comprises:
the first blocking piece is used for blocking the through hole;
the second blocking piece is used for blocking the first oil outlet;
the connecting rod is used for connecting the first blocking piece and the second blocking piece, and the thermosensitive medium is arranged in the connecting rod.
5. The oil return valve according to claim 4, characterized in that the through hole and/or the first blocking member has a conical structure, the first blocking member being able to extend into the through hole, the maximum diameter of the first blocking member being larger than the minimum aperture of the through hole.
6. The oil return valve of claim 4, wherein the first oil outlet includes a tapered bore, the second closure member is extendable into the tapered bore, and a maximum diameter of the second closure member is greater than a minimum aperture of the tapered bore;
and/or the number of the groups of groups,
the second blocking piece comprises a conical part, the conical part can extend into the first oil outlet, and the maximum diameter of the conical part is larger than the caliber of the first oil outlet.
7. The oil return valve of claim 3, further comprising:
the fixed support is arranged in the valve body, the first end of the fixed support is connected with the valve body, the second end of the fixed support is propped against or connected with the second end of the first elastic piece, and the second end of the fixed support is in sliding connection with the valve core.
8. An oil return system comprising an oil return valve according to any one of claims 1-7.
9. The oil return system according to claim 8, wherein a third oil outlet is provided on a valve body of the oil return valve, the third oil outlet being in communication with an oil inlet of the valve body;
the oil return system further includes:
the first end of the first one-way valve is communicated with a first oil outlet of the oil return valve, the second end of the first one-way valve is communicated with an oil return port of an oil tank, and the conduction direction of the first one-way valve is consistent with the direction from the first end to the second end of the first one-way valve;
the first end of the second one-way valve is communicated with the second oil outlet of the oil return valve, the second end of the second one-way valve is communicated with the radiator, and the conduction direction of the second one-way valve is consistent with the direction from the first end to the second end of the second one-way valve;
the first end of the third one-way valve is communicated with the third oil outlet, the second end of the third one-way valve is communicated with an oil return port of the oil tank, and the conduction direction of the third one-way valve is consistent with the direction from the first end to the second end of the third one-way valve; and the opening pressure of the third one-way valve is larger than the opening pressure of the first one-way valve and the second one-way valve, and the opening pressure of the third one-way valve is smaller than or equal to the police backpressure.
10. A work machine comprising an oil return valve according to any one of claims 1-7 or an oil return system according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321844190.6U CN220378584U (en) | 2023-07-13 | 2023-07-13 | Oil return valve, oil return system and operation machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321844190.6U CN220378584U (en) | 2023-07-13 | 2023-07-13 | Oil return valve, oil return system and operation machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220378584U true CN220378584U (en) | 2024-01-23 |
Family
ID=89558876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321844190.6U Active CN220378584U (en) | 2023-07-13 | 2023-07-13 | Oil return valve, oil return system and operation machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220378584U (en) |
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2023
- 2023-07-13 CN CN202321844190.6U patent/CN220378584U/en active Active
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