CN-120626478-B - Electric control valve for closed hydraulic pump

CN120626478BCN 120626478 BCN120626478 BCN 120626478BCN-120626478-B

Abstract

The invention belongs to the technical field of electric control valves, and particularly relates to an electric control valve for a closed hydraulic pump. The electromagnetic valve comprises a shell, wherein a valve body is fixedly connected in the shell, electromagnetic driving parts are arranged on two sides of the shell, a first valve core is connected in a sliding manner in the valve body, a second valve core is connected on two sides of the first valve core in a threaded manner, a third valve core is connected on one side of the second valve core in a threaded manner, which is far away from the first valve core, a driving end of the electromagnetic driving part is used for pushing the third valve core to move, a first guide ring is connected in a rotating manner with the second valve core, a supporting rod is fixedly connected in the valve body, a feedback rod is fixedly connected with the supporting rod, and a valve control system and a circulating system are arranged in the valve body. According to the invention, the first guide ring guides and disperses the oil, so that the impact force of the oil on the edge of the second valve core is reduced, the probability of abrasion of the second valve core is reduced, and the sealing between the second valve core and the valve body is ensured.

Inventors

LIU QIN
WANG FUHONG
SUN XIAOHAO
ZHANG WENKE
ZHANG WU

Assignees

江苏可奈力机械制造有限公司

Dates

Publication Date: 20260512
Application Date: 20250609

Claims (5)

1. The electric control valve for the closed hydraulic pump is characterized by comprising a shell (1), wherein a valve body (2) is fixedly connected in the shell (1), electromagnetic driving pieces (3) are arranged on two sides of the shell (1), a first valve core (4) is connected in a sliding mode in the valve body (2), a second valve core (5) is connected on two sides of the first valve core (4) in a threaded mode, a third valve core (6) is connected on one side, far away from the first valve core (4), of the second valve core (5), the driving end of the electromagnetic driving piece (3) is used for pushing the third valve core (6) to move, a first guide ring (7) is connected with the second valve core (5) in a rotating mode, a supporting rod (8) is fixedly connected in the valve body (2), a feedback rod (9) is fixedly connected in the supporting rod, a valve control system and a circulation system are arranged in the valve body (2), and the valve control system is used for controlling the swing of the feedback rod (9), and the circulation system is used for providing a space for changing an oil way in the valve body (2). The first guide ring (7) is in a shape of a circular truncated cone; the first guide ring (7) is fixedly connected with guide bulges (21) which are circumferentially distributed; a second guide ring (31) is rotationally connected to the third valve core (6), and the second guide ring (31) is in contact with the adjacent second valve core (5); The second guide ring (31) is fixedly connected with guide convex strips (32) which are circumferentially distributed; The outer side of the projection of the second guide ring (31) on a plane passing through the axis of the second guide ring is arc-shaped.
2. The electric control valve for a closed hydraulic pump according to claim 1, wherein the circulation system is composed of a first outlet oil passage (100), a second outlet oil passage (200), a first inlet oil passage (300), a second inlet oil passage (400), a first return oil passage (500), a second return oil passage (600), a first through oil passage (700), a second through oil passage (800), a working chamber (900), a rotating chamber (1000) and an oil discharge passage (1100), the first outlet oil passage (100), the first inlet oil passage (300), the first return oil passage (500) and the first through oil passage (700) are all arranged on one side of the valve body (2), the second outlet oil passage (200), the second inlet oil passage (400), the second return oil passage (600) and the second through oil passage (800) are all arranged on the other side of the valve body (2), the number of the working chambers (900) is two, and are all arranged in the valve body (2), the first (4) is positioned in the two working chambers (100), the two adjacent sliding chambers (6), the first inlet oil passage (300), the second inlet oil passage (400), the second inlet oil passage (600) and the second through oil passage (800) are all arranged on one side of the valve body (2) The first oil return duct (500), the second oil return duct (600), the first oil return duct (700) and the second oil return duct (800) are respectively communicated with the adjacent working cavity (900), the rotary cavity (1000) is arranged in the valve body (2), the first oil return duct (500), the second oil return duct (600), the first oil return duct (700) and the second oil return duct (800) are respectively communicated with the rotary cavity (1000), and the oil drain duct (1100) is arranged on the supporting rod (8) and is communicated with the rotary cavity (1000).
3. The electrically controlled valve for a closed hydraulic pump according to claim 2, wherein the number of the first passage (700) and the second passage (800) is at least two.
4. The electrically controlled valve for a closed hydraulic pump according to claim 3, further comprising: The collecting shell (41) is arranged in the rotary cavity (1000), the collecting shell (41) is provided with a plurality of communication ports, the number of the communication ports is consistent with the sum of the numbers of all the first oil passing channels (700) and all the second oil passing channels (800), the collecting shell (41) is fixedly connected with a fixed column (42) at the communication ports, the fixed column (42) is fixedly connected with a discharge pipe (43), and the first oil passing channels (700) and the second oil passing channels (800) are respectively communicated with the adjacent discharge pipes (43); The fixed frame (44) is arranged on the upper side of the fixed column (42), the fixed frame (44) is fixedly connected with the interception net (45), and the interception net (45) is fixedly connected with the collecting shell (41).
5. The electrically controlled valve for a closed hydraulic pump according to claim 4, wherein the blocking net (45) has a guide portion and a dispersion portion, wherein the guide portion is located in the fixing frame (44) and is in a reverse truncated cone shape, and the dispersion portion is located outside the guide portion.

Description

Electric control valve for closed hydraulic pump Technical Field The invention accords with the technical field of electric control valves, and particularly relates to an electric control valve for a closed hydraulic pump. Background The closed hydraulic pump periodically changes the sealing volume through the movement of the plunger to realize the suction and discharge of liquid, and meanwhile, the high-pressure outlet of the hydraulic pump is directly connected with the input end of the hydraulic motor, and the output end of the motor is connected with the oil suction port of the hydraulic pump to form a closed oil path. In order to regulate the displacement and flow rate of the hydraulic pump and control the flow direction of oil, an electric control valve is arranged in the hydraulic pump, and the electric control valve which is generally used at present is found to be an electric proportional valve (for example, A4VG model series) through investigation, and the displacement or direction of the hydraulic pump is directly controlled mainly through axial displacement of a valve core driven by a proportional electromagnet. The existing electric proportional valve (represented by A4VG series) has the structural reliability defect that when an internal valve core is in reciprocating movement, under the working state, oil flowing at high speed in different oil channels (particularly high-pressure oil drain ports) can generate fluid acting force (such as dynamic pressure and shearing force) on the surface of the valve core (particularly corresponding to the area of the oil drain ports), and as the service time is prolonged, the position of the valve core corresponding to the oil drain ports can be worn due to long-term scouring and abrasion of the oil, so that the fit clearance between the valve core and a valve body hole is increased, the sealing performance is reduced, and the flow of the oil in the electric proportional valve is uncontrollable, so that the electric proportional valve cannot accurately control the displacement or direction of a hydraulic pump. Disclosure of Invention In order to overcome the drawbacks set forth in the background art above, the present invention provides an electrically controlled valve for a closed hydraulic pump. The technical scheme includes that the electric control valve for the closed hydraulic pump comprises a shell, a valve body is fixedly connected in the shell, electromagnetic driving pieces are arranged on two sides of the shell, a first valve core is connected in a sliding mode in the valve body, a second valve core is connected on two sides of the first valve core in a threaded mode, a third valve core is connected on one side, far away from the first valve core, of the second valve core in a threaded mode, a driving end of the electromagnetic driving piece is used for pushing the third valve core to move, the second valve core is rotationally connected with a first guide ring, a supporting rod is fixedly connected in the valve body, a feedback rod is fixedly connected in the supporting rod, a valve control system and a circulating system are arranged in the valve body, the valve control system is used for controlling swing of the feedback rod, and the circulating system is used for providing a space for changing an oil way in the valve body. Further stated, the first guide ring is in the shape of a circular truncated cone. Further stated, the circulation system is composed of a first oil outlet channel, a second oil outlet channel, a first oil inlet channel, a second oil inlet channel, a first oil return channel, a second oil return channel, a first oil passing channel, a second oil passing channel, a working cavity, a rotary cavity and an oil discharging channel, wherein the first oil outlet channel, the first oil inlet channel, the first oil return channel and the first oil passing channel are all arranged on one side of the valve body, the second oil outlet channel, the second oil inlet channel, the second oil return channel and the second oil passing channel are all arranged on the other side of the valve body, the number of the working cavities is two, and the first valve core is positioned in two working cavities, the two valve cores are respectively positioned adjacent in the working cavities, the first oil outlet channel, the second oil outlet channel, the first oil inlet channel, the second oil inlet channel, the first oil return channel, the second oil return channel, the first oil return channel, the second oil passing channel, the rotary cavity, the first oil passing channels, the rotary cavity, the second oil channels, the rotary cavities and the first oil passing through the two. Further stated, the first guide ring is fixedly connected with guide protrusions distributed in the circumferential direction. Further stated, the third valve core is rotatably connected with a second guide ring, and the second guide ring is in contact with the adjacent se