CN210461043U - Thread cartridge type speed sensitive load control valve - Google Patents
Thread cartridge type speed sensitive load control valve Download PDFInfo
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- CN210461043U CN210461043U CN201921145263.6U CN201921145263U CN210461043U CN 210461043 U CN210461043 U CN 210461043U CN 201921145263 U CN201921145263 U CN 201921145263U CN 210461043 U CN210461043 U CN 210461043U
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- oil port
- sleeve
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- valve core
- oil
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- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 20
- 238000005457 optimization Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
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Abstract
A threaded plug-in type speed sensitive load control valve is characterized by comprising a valve sleeve, a threaded sleeve, an adjusting rod, a valve core, a throttling sheet, a first spring seat, a second spring seat and a spring, wherein the valve sleeve is hollow in the axial direction and is sequentially provided with a first oil port and a second oil port from front to back in the lateral direction; the screw sleeve is axially hollow, is arranged at the rear end of the valve sleeve and forms an inner cavity with the valve sleeve, and is laterally provided with a third oil port; the valve core is arranged in an inner cavity formed by the thread sleeve and the valve sleeve, the front end of the valve core is in sliding fit with the valve sleeve, the rear end of the valve core is sleeved on the periphery of the front end of the adjusting rod, and the valve core is laterally and sequentially provided with a first oil port, a first oil through hole matched with the first oil port and a second oil through hole communicated with a third oil port from front to back. Compared with an electric control system applied to variable control of a hydraulic pump driven by an internal combustion engine, the hydraulic control system is low in cost and stable and reliable in operation.
Description
Technical Field
The utility model relates to a control valve can be applied to the declination that is used for adjusting the variable pump on internal-combustion engine driven's the hydraulic pump, control load.
Background
Before the load of the internal combustion engine is suddenly increased and exceeds the power range of the engine, the internal combustion engine needs to be controlled emergently to prevent the internal combustion engine from being flamed out in an overload mode, and at present, the emergency control is realized through a complex electric control system. The electric control system has the defect of high cost. How to realize global optimization matching with an internal combustion engine by automatically adjusting the deflection angle of a variable pump through simple hydraulic control is a research subject of researchers in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to foretell technical current situation and provide one kind through perception valve port flow and the pressure differential that produces with this control variable pump variable displacement mechanism declination to realize the sensitive load control valve of automatic speed change control's screw thread cartridge formula speed.
The present invention is directed to a speed-sensitive load control valve of the screw-in cartridge type, which can rapidly adjust the deflection angle of a variable displacement pump when the power rating of an internal combustion engine is exceeded.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a thread cartridge type speed sensitive load control valve is characterized by comprising
The valve sleeve is axially hollow and is provided with a first oil port and a second oil port in sequence from front to back in a lateral direction;
the screw sleeve is axially hollow, is arranged at the rear end of the valve sleeve and forms an inner cavity with the valve sleeve, and is laterally provided with a third oil port;
the adjusting rod is hermetically arranged in the screw sleeve, and the front end of the adjusting rod extends into an inner cavity formed by the screw sleeve and the valve sleeve;
the valve core is arranged in an inner cavity formed by the thread sleeve and the valve sleeve, the front end of the valve core is in sliding fit with the valve sleeve, the rear end of the valve core is sleeved on the periphery of the front end of the adjusting rod, and the valve core is laterally and sequentially provided with a first oil through hole matched with the first oil port and a second oil through hole communicated with the third oil port from front to back;
the throttling sheet is arranged at the front end of the valve core and is provided with a fourth oil port;
the first spring seat is sleeved at the front end of the adjusting rod and is abutted against the blocking wall of the adjusting rod;
the second spring seat is sleeved at the front end of the adjusting rod and can slide back and forth on the adjusting rod, and the second spring seat is positioned in front of the first spring seat and is abutted against the inner wall of the valve core; and
the spring is sleeved at the front end of the adjusting rod and always forces the second spring seat to keep away from the first spring seat;
when the valve core moves backwards, the first oil port is communicated with the first oil through hole, and the first oil port is blocked off from the second oil port; and under the state of the limit position of forward movement of the valve core, the first oil port and the first oil through hole are blocked, and the first oil port is communicated with the second oil port.
The spring is preferably arranged as follows: the front end of the spring is abutted against the second spring seat, and the rear end of the spring is abutted against the first spring seat.
Furthermore, a stop ring matched with the first spring seat in an abutting mode is arranged on the inner wall of the rear end of the valve core.
Furthermore, the front end of the adjusting rod is sequentially provided with a locking nut and a gasket which is matched with the second spring seat in an abutting mode from front to back.
The periphery of the valve core is provided with a guide sleeve, the outer wall of the guide sleeve is sealed with the inner wall of the valve sleeve and can slide, and the guide sleeve plays a certain supporting role as an intermediate part, so that the valve core is ensured to stably and reliably operate.
Considering the size adjustment of the oil inlet to adapt to different working conditions, the front end of the valve core is arranged on the outer side of the throttling sheet and is provided with an adjusting seat, a through hole is formed in the adjusting seat, a conical piece is convexly arranged on the inner side of the adjusting seat, and the conical piece is over against the fourth oil port and can adjust the oil inlet size of the fourth oil port.
Compared with the prior art, the utility model has the advantages of: the utility model adjusts and controls the deflection angle of the variable mechanism of the variable pump by sensing the pressure difference generated by the valve port flow, realizes the automatic speed change control, can realize the control of the walking speed by only pedaling the accelerator by an operator, has simple and convenient operation, and can reduce the oil consumption; meanwhile, the method is combined with the power characteristics of the internal combustion engine to realize global optimization control, and before the load surge exceeds the power domain of the engine, the exponential acceleration adjustment reduces the deflection angle of the variable pump, so that the internal combustion engine is prevented from being overloaded and flameout, and the burden and the skill requirement of an operator can be reduced. Compared with an electric control system applied to an internal combustion engine, the electric control system has low cost and stable and reliable operation.
Drawings
FIG. 1 is a schematic structural diagram of the embodiment
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1, the threaded cartridge type speed-sensitive load control valve in the present embodiment includes a valve housing 5, a threaded sleeve 15, an adjustment rod 16, a valve core 6, a throttle plate 4, a first spring seat 121, a second spring seat 12, and a spring 13.
The valve sleeve 5 is axially hollow and is provided with a first oil port 1b and a second oil port 1c in sequence from front to back in the lateral direction; the screw sleeve 15 is axially hollow, is arranged at the rear end of the valve sleeve 5, forms an inner cavity with the valve sleeve 5, and is laterally provided with a third oil port 1 d.
The adjusting rod 16 is hermetically arranged in the threaded sleeve 15, and the front end of the adjusting rod extends into an inner cavity formed by the threaded sleeve 15 and the valve sleeve 5; the adjusting rod 16 can move back and forth to adjust the stroke of the valve core 6.
The valve core 6 is arranged in an inner cavity formed by a threaded sleeve 15, a threaded sleeve 15 and a valve sleeve 5, the front end of the valve core 6 is in sliding fit with the valve sleeve 5, the rear end of the valve core 6 is sleeved on the periphery of the front end of the adjusting rod 16, and the valve core 6 is laterally and sequentially provided with a first oil through hole 61 matched with the first oil port 1b and a second oil through hole 62 communicated with the third oil port 1d from front to back;
the throttle plate 4 is provided at the front end of the valve body 6 through the orifice stopper 3 and has a fourth oil port 1 a.
The first spring seat 121 is sleeved at the front end of the adjusting rod 16 and abuts against the blocking wall 161 of the adjusting rod 16; the second spring seat 12 is sleeved at the front end of the adjusting rod 16 to enable the adjusting rod 16 to slide back and forth, and the second spring seat 12 is located in front of the first spring seat 121 and abuts against the inner wall 53 of the valve core 6; the spring 13 is sleeved on the front end of the adjusting rod 16, the front end of the adjusting rod abuts against the second spring seat 12, and the rear end of the adjusting rod abuts against the first spring seat 121. The spring 13 always forces the second spring seat 12 to maintain a tendency away from the first spring seat 121.
In the state that the valve core 6 moves backwards, the first oil port 1b is communicated with the first oil through hole 61, and the first oil port 1b is blocked from the second oil port 1 c; in the state of the extreme position where the spool 6 moves forward, the first port 1b blocks the first oil passage hole 61, and the first port 1b communicates with the second port 1 c.
The inner wall of the rear end of the valve core 6 is provided with a stop ring 14 which is matched with the first spring seat 121 in an abutting mode. The front end of the adjusting rod 16 is sequentially provided with a locking nut 9 and a washer 11a which is propped against the second spring seat 12 from front to back. The periphery of the valve core 6 is provided with a guide sleeve 7 through a shaft retainer ring 8, and the outer wall of the guide sleeve 7 is sealed with the inner wall of the valve sleeve 5 and can slide.
The front end of the valve core 6 is arranged outside the throttling sheet 4 and is provided with an adjusting seat 1, a through hole 12c is formed in the adjusting seat 1, a conical piece 11 is convexly arranged on the inner side of the adjusting seat 1, and the conical piece 11 is over against the fourth oil port 1a and can adjust the oil inlet size of the fourth oil port 1 a. The size of the oil inlet of the fourth oil port 1a can be adjusted by moving the adjusting seat 1 back and forth.
The thread cartridge speed sensitive load control valve mainly senses the pressure difference generated by the flow of the valve port to adjust and control the deflection angle of a variable mechanism of the variable pump, thereby realizing the automatic speed change control; meanwhile, the method is combined with the power characteristics of the internal combustion engine to realize global optimization control, and before the load surge exceeds the power domain of the engine, the exponential acceleration adjustment is carried out to reduce the deflection angle of the variable pump, so that the internal combustion engine is prevented from being overloaded and flameout.
Speed sensitive principle: the fourth oil port 1a is connected with an auxiliary constant delivery pump of a closed system of the direct connection of the internal combustion engine, the flow of flowing oil is in direct proportion to the rotating speed of the internal combustion engine, when the oil flows through the throttle plate 4, the front cavity and the rear cavity of the fourth oil port 1a corresponding to the two ends of the throttle plate 4 generate pressure difference, and the size of the pressure difference and the flowing flow form an exponential relationship of 2 power. When an operator steps on an accelerator pedal, the rotating speed of the internal combustion engine is increased, the flow is increased in proportion, the pressure difference is exponentially enlarged, the valve core 6 is pushed to move leftwards by overcoming the prepressing force of the spring 13 under the action of the pressure difference, the valve core 6 drives the second spring seat 12 to move, meanwhile, the spring 13 is compressed, the groove corresponding to the first oil through hole 61 and the channel of the first oil port 1b are enlarged, the pressure of the first oil port 1b is increased, the flowing flow is also increased, and therefore the variable piston of the variable pump is pushed to eject, the deflection angle of the pump regulating mechanism is increased, the output flow of the variable pump is increased, and the walking speed of the vehicle is. The operator can control the speed of the vehicle by only stepping on the size of the oil pressure valve, and the operation mode is simplified.
According to the Bernoulli equation and the fluid continuity equation of Newtonian hydrodynamics, the throttling principle is adopted.
Load control principle: when the load of the vehicle is increased rapidly and limited by the power domain of the internal combustion engine, and the load power is close to the boundary of the power domain of the engine, the rotating speed of the internal combustion engine is reduced rapidly, the output flow of the auxiliary constant delivery pump of the closed system directly connected with the internal combustion engine is reduced synchronously and rapidly, and the pressure difference of the front cavity and the rear cavity of the fourth oil port 1a generated when oil flows through the throttle plate 4 is reduced in an exponential manner of 2. The second spring seat 12 is pushed to move forwards by overcoming hydraulic pressure generated by pressure difference under the action of the spring 13, the valve core 6 is pushed to move rightwards rapidly until the second spring seat 12 abuts against the gasket 11a, a channel of the first oil through hole 61 and a channel of the first oil port 1b are reduced until closed, the first oil port 1b is communicated with the second oil port 1c, the pressure of the first oil port 1b is reduced rapidly, the variable piston of the variable pump retracts, the deflection angle of the variable mechanism of the regulating pump is reduced until zero, the output flow of the variable pump is reduced instantly until zero, the output power of the internal combustion engine is reduced rapidly, the power overload flameout of the internal combustion engine is avoided, the overload automatic protection control of the vehicle is realized, at the moment, an operator does not need to operate in an emergency, and the operation requirement is reduced.
The utility model discloses simple structure adopts and adjusts mechanical spring characteristic fit explosive motor power domain curve, through the pressure differential transmission, and restriction variable pump output guarantees that the load matches, avoids explosive motor to transship and flame-out. The whole layout is novel and reasonable, the structure is compact, the number of parts is small, and the operation is reliable and durable.
Claims (6)
1. A thread cartridge type speed sensitive load control valve is characterized by comprising
The valve sleeve (5) is hollow in the axial direction, and is provided with a first oil port (1b) and a second oil port (1c) from front to back in sequence in the lateral direction;
the screw sleeve (15) is axially hollow, is arranged at the rear end of the valve sleeve (5), forms an inner cavity together with the valve sleeve (5), and is laterally provided with a third oil port (1 d);
the adjusting rod (16) is hermetically arranged in the threaded sleeve (15) and the front end of the adjusting rod extends into an inner cavity formed by the threaded sleeve (15) and the valve sleeve (5);
the valve core (6) is arranged in an inner cavity formed by the threaded sleeve (15) of the threaded sleeve (15) and the valve sleeve (5), the front end of the valve core (6) is in sliding fit with the valve sleeve (5), the rear end of the valve core is sleeved on the periphery of the front end of the adjusting rod (16), and the valve core (6) is laterally provided with a first oil through hole (61) matched with the first oil port (1b) and a second oil through hole (62) communicated with the third oil port (1d) from front to back in sequence;
a throttle plate (4) which is arranged at the front end of the valve core (6) and is provided with a fourth oil port (1 a);
a first spring seat (121) which is sleeved at the front end of the adjusting rod (16) and is propped against the blocking wall of the adjusting rod (16);
the second spring seat (12) is sleeved at the front end of the adjusting rod (16) to enable the adjusting rod (16) to slide back and forth, and the second spring seat (12) is positioned in front of the first spring seat (121) and is abutted against the inner wall of the valve core (6); and
the spring (13) is sleeved at the front end of the adjusting rod (16) and always forces the second spring seat (12) to keep away from the trend of the first spring seat (121);
when the valve core (6) moves backwards, the first oil port (1b) is communicated with the first oil through hole (61), and the first oil port (1b) is blocked from the second oil port (1 c); in the state of the limit position where the valve core (6) moves forward, the first oil port (1b) blocks the first oil through hole (61), and the first oil port (1b) communicates with the second oil port (1 c).
2. The threaded cartridge speed sensitive load control valve according to claim 1, characterized in that the spring (13) has a front end abutting against the second spring seat (12) and a rear end abutting against the first spring seat (121).
3. The threaded cartridge type speed-sensitive load control valve according to claim 1, wherein the inner wall of the rear end of the valve core (6) is provided with a stop ring (14) which is in butt fit with the first spring seat (121).
4. The threaded cartridge type speed-sensitive load control valve according to claim 1, wherein the front end of the adjusting rod (16) is provided with a lock nut (9) and a washer (11a) which is matched with the second spring seat (12) in an abutting manner from front to back in sequence.
5. The threaded cartridge type speed sensitive load control valve according to claim 1, characterized in that the valve core (6) is provided with a guide sleeve (7) at its outer periphery, and the outer wall of the guide sleeve (7) is sealed with the inner wall of the valve sleeve (5) and can slide.
6. The threaded cartridge type speed-sensitive load control valve according to claim 1, wherein the front end of the valve core (6) is located outside the throttle plate (4) and is provided with an adjusting seat (1), the adjusting seat (1) is provided with a through hole (12c), the inner side of the adjusting seat (1) is convexly provided with a conical member (11), and the conical member (11) is arranged over against the fourth oil port (1a) and can adjust the oil inlet size of the fourth oil port (1 a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921145263.6U CN210461043U (en) | 2019-07-19 | 2019-07-19 | Thread cartridge type speed sensitive load control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921145263.6U CN210461043U (en) | 2019-07-19 | 2019-07-19 | Thread cartridge type speed sensitive load control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210461043U true CN210461043U (en) | 2020-05-05 |
Family
ID=70446657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921145263.6U Withdrawn - After Issue CN210461043U (en) | 2019-07-19 | 2019-07-19 | Thread cartridge type speed sensitive load control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210461043U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285048A (en) * | 2019-07-19 | 2019-09-27 | 宁波克泰液压有限公司 | Screw thread inserting type speed sensitive load control valve |
-
2019
- 2019-07-19 CN CN201921145263.6U patent/CN210461043U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285048A (en) * | 2019-07-19 | 2019-09-27 | 宁波克泰液压有限公司 | Screw thread inserting type speed sensitive load control valve |
| CN110285048B (en) * | 2019-07-19 | 2024-03-19 | 宁波克泰液压有限公司 | Screw thread plug-in type speed sensitive load control valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200505 Effective date of abandoning: 20240319 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200505 Effective date of abandoning: 20240319 |