High-speed response nozzle flapper speed regulating valve with controllable valve core movement

Abstract

The present application provides a high-speed response nozzle flapper speed control valve with controllable valve core movement, comprising a flapper structure, a valve body, a valve core, a quick-exhaust valve core, a quick-exhaust valve body, and a throttle. The valve body is provided with a first cavity, a second cavity, an oil outlet, an oil inlet, a first oil outlet, a first throttling channel, and a jet channel. The valve core is provided with a third cavity, a main channel, an oil inlet channel, and an oil outlet channel. The quick-exhaust valve body is provided with a first quick-exhaust channel, a second quick-exhaust channel, a third quick-exhaust channel, a fourth quick-exhaust channel, and a quick-exhaust valve core channel. The flapper structure is provided in the first cavity, the valve core is provided in the second cavity, the quick-exhaust valve core and the quick-exhaust valve body are provided in the third cavity, and the throttle is provided in the first throttling channel. The speed control valve of the present application can quickly and effectively ensure that the hydraulic speed control device can stably adjust the speed, while reducing the heat generated by friction between the valve core and the valve wall, thereby increasing the service life of the device.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic valves, and in particular to a high-speed response nozzle flapper speed regulating valve with controllable valve core movement. Background Art

[0002] Hydraulic speed control devices offer high precision and reliability and are widely used in various mechanical equipment, such as industrial production lines, lifting equipment, and rail transit. The nozzle-flapper valve is a critical component in hydraulic speed control devices. The speed at which the nozzle-flapper valve regulates the oil pressure within the valve body determines the device's ability to regulate engine speed. While existing nozzle-flapper valves can adjust the oil pressure within the valve body by adjusting the distance between the nozzle and the flapper, thereby adjusting the valve core's movement speed, these valves lack the ability to quickly and effectively control the valve core's movement speed. Significant changes in engine load also cause significant fluctuations in engine speed. To maintain a stable engine speed at the set value, the speed of the speed control valve's spool must also vary significantly. Excessive speed fluctuations can cause friction between the spool and the valve wall, generating significant heat and affecting the oil's operating temperature. Furthermore, excessive spool speed can cause excessive impact between the spool and the valve wall, shortening the valve's service life. When the engine load fluctuates slightly—that is, when the engine load changes just enough to cause the valve core's movement to fluctuate around the critical point—the friction between the valve core and the valve wall changes between static and dynamic friction, causing the valve core's movement to cease continuously, thereby reducing the valve core's service life. Therefore, how to quickly and effectively ensure that the hydraulic speed control device can stably adjust the speed while reducing the heat generated by friction between the valve core and the valve wall and extending the device's service life remains a pressing issue. Summary of the Invention

[0003] In response to the problems existing in the prior art, an embodiment of the present application provides a speed control valve that quickly and effectively ensures that a hydraulic speed control device can stably adjust the speed of the valve core, while reducing heat generation and friction of the valve core, thereby increasing the service life of the device.

[0004] The embodiment of the present application provides a high-speed response nozzle flapper speed control valve with controllable valve core movement. The speed control valve includes a flapper structure, a valve body, a valve core, a quick-exhaust valve core, a quick-exhaust valve body, and a throttle. The valve body is provided with a first cavity, a second cavity, an oil outlet, an oil inlet, a first oil outlet, a first throttling channel, a jet channel, and a second oil outlet. The valve core is provided with a third cavity, a main channel, an oil inlet channel, and an oil outlet channel. The quick-exhaust valve body is provided with a first quick-exhaust channel, a second quick-exhaust channel, a third quick-exhaust channel, a fourth quick-exhaust channel, and a quick-exhaust valve core channel. The flapper structure is provided in the first cavity, the valve core is provided in the second cavity, the quick-exhaust valve body is provided in the third cavity, the quick-exhaust valve core is provided in the quick-exhaust valve core channel, and the throttle is provided in the first throttling channel.

[0005] The valve core divides the second chamber into two chambers, which are a chamber on the side away from the baffle structure and a chamber on the side close to the baffle structure. The chamber on the side of the first chamber close to the baffle structure is connected through a jet channel, and the main channel connects the chamber on the side away from the baffle structure and the chamber on the side close to the baffle structure. The oil inlet channel connects the oil inlet and the main channel, the other end of the oil inlet is connected to the atmosphere, the oil outlet is connected to the main channel and the atmosphere, the second oil discharge port is connected to the first chamber and the atmosphere, and the third chamber is connected to the chamber on the side away from the baffle structure and the main channel.

[0006] The first quick exhaust channel connects the quick exhaust valve core channel and the second quick exhaust channel, the second quick exhaust channel connects the quick exhaust valve core channel, the first quick exhaust channel and the second cavity, the third quick exhaust channel connects the quick exhaust valve core channel, the fourth quick exhaust channel and the second cavity, the fourth quick exhaust channel connects the quick exhaust valve core channel, the third quick exhaust channel and the main channel, the quick exhaust valve core divides the quick exhaust valve core channel into two flow channels, and the second quick exhaust channel and the third quick exhaust channel are respectively connected to one of the flow channels.

[0007] The valve core has two working positions, which are described as follows:

[0008] When the valve core is in the first working position, the first quick exhaust passage is communicated with the first oil exhaust port, and the oil outlet passage is communicated with the oil outlet port.

[0009] When the valve core is in the second working position, the first quick exhaust passage and the first oil exhaust port are disconnected, and the oil outlet passage and the oil outlet port are disconnected.

[0010] In an optional embodiment, a spring is further provided between the throttle and the valve body, the throttle is a throttle ball, and the baffle structure is a piezoelectric crystal.

[0011] In an optional embodiment, in a cross section perpendicular to the axis, the cross-sectional area of the third fast exhaust channel is smaller than the cross-sectional area of the second fast exhaust channel.

[0012] In an optional embodiment, it further includes a first flow channel and a second flow channel, and the first flow channel and the second flow channel are opened in the valve core, wherein the first flow channel connects the fourth quick exhaust channel and the main channel, and the second flow channel connects the second quick exhaust channel, the third quick exhaust channel and the side of the second cavity away from the baffle structure.

[0013] In an optional embodiment, the cross-sectional area of the first flow channel is larger than the cross-sectional area of the second flow channel.

[0014] In an optional embodiment, a third flow channel is further included, which is opened on the side of the valve body close to the baffle structure. The third flow channel connects the side of the second cavity close to the baffle structure and the oil tank. A piezoelectric crystal or an electrically controlled throttle valve or an electrically controlled overflow valve is arranged in the third flow channel.

[0015] In an optional embodiment, from the side close to the baffle structure to the side away from the baffle structure, the second cavity further includes a first cavity, a second cavity, a third cavity and a fourth cavity in sequence, and the valve core is arranged in the first cavity. The valve core includes a first valve core body and a second valve core body. In the cross-section perpendicular to the axial centerline, the cross-sectional area of the second cavity, the third cavity and the first cavity is smaller than the cross-sectional area of the first cavity, the cross-sectional shape of the first valve core body is the same as the cross-sectional shape of the second cavity, and the cross-sectional shape of the second valve core body is the same as the cross-sectional shape of the first cavity.

[0016] In an optional embodiment, a blocking block is further provided in the first oil drain port, and the blocking block is provided on a side close to the second cavity.

[0017] In an optional embodiment, the blocking block is a mesh film structure or a block structure with a plurality of pores, or a plurality of through holes are provided on the valve body.

[0018] In an optional embodiment, a screw is further included, and a thread is provided on a side of the first oil drain port away from the second cavity, and the screw is used to cooperate with the thread.

[0019] Compared to the prior art, the present invention controls the speed of change in oil pressure at both ends of the speed control valve spool by providing a throttle, quick-discharge valve core, and quick-discharge valve body, thereby controlling the speed of movement of the speed control valve spool. When the engine load changes significantly, the engine speed will also change significantly, affecting the movement speed of the spool. When the engine load changes significantly, on the one hand, the movement speed between the control valve core and the valve body varies within a relatively low range, which can reduce the friction of the oil between the valve core and the valve body, thereby reducing the heat generated by friction, allowing the oil to operate at a lower temperature, and thus ensuring that the operating viscosity of the oil varies within the required operating range. On the other hand, the movement speed between the control valve core and the valve body is rapidly reduced, which can prevent excessive impact between the valve core and the valve body, thereby extending the service life of the speed control valve. When the engine load changes less, the movement speed between the control valve core and the valve body is increased, which can keep the movement speed of the spool stable, thereby maintaining the movement of the spool in a continuous state and extending the service life of the spool. Therefore, the speed control valve provided in the present application can quickly and effectively ensure that the hydraulic speed control device can stably adjust the speed, while reducing the heat generated by friction between the valve core and the valve wall, thereby increasing the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a high-speed response nozzle flapper speed regulating valve with controllable valve core movement provided in Example 1 of the present application;

[0021] Figure 2 A schematic structural diagram of the valve body provided in Example 1 of the present application;

[0022] Figure 3 A schematic diagram of the structure of the valve core provided in Example 1 of the present application;

[0023] Figure 4 This is a schematic structural diagram of the quick exhaust valve body provided in Example 1 of the present application;

[0024] Figure 5 for Figure 2 Schematic diagram of the structure at A;

[0025] Figure 6 This is a schematic structural diagram of a high-speed response nozzle flapper speed regulating valve with controllable valve core movement provided in Example 2 of the present application;

[0026] Figure 7 A schematic structural diagram of the valve body provided in Example 2 of the present application;

[0027] Figure 8 A schematic diagram of the structure of the valve core provided in Example 2 of the present application;

[0028] Figure 9 This is a schematic structural diagram of the quick exhaust valve body provided in Example 2 of the present application.

[0029] Main reference numerals:

[0030] Baffle structure 100;

[0031] Valve body 200; oil outlet 201; oil inlet 202; first oil discharge port 203; first throttling channel 204; jet channel 205; second throttling channel 206; third channel 207; second oil discharge port 208; first chamber 210; blocking block 211; oil discharge pipe 212; second chamber 220; first chamber 221; second chamber 222; third chamber 223; fourth chamber 224;

[0032] Valve core 300; first valve core body 310; third cavity 311; main flow channel 312; oil inlet flow channel 313; oil outlet flow channel 314; first flow channel 315; second flow channel 316; first oil inlet flow channel 317; second oil inlet flow channel 318; second valve core body 320;

[0033] Quick exhaust block 400; quick exhaust valve core 410; quick exhaust valve body 420; first quick exhaust passage 421; second quick exhaust passage 422; third quick exhaust passage 423; fourth quick exhaust passage 424; quick exhaust valve core passage 425;

[0034] Restrictor 500. DETAILED DESCRIPTION

[0035] To fully describe the technical content, structural features, objectives and effects of this application, the following will be described in detail with reference to the accompanying drawings.

[0036] First embodiment:

[0037] See also Figure 1 , Figure 1 This is a schematic structural diagram of a high-speed responsive nozzle baffle speed regulating valve with controllable valve core movement provided in Example 1 of the present application. The structure of the high-speed responsive nozzle baffle speed regulating valve with controllable valve core movement includes a baffle structure 100, a valve body 200, a valve core 300, a quick-exhaust valve core 410, a quick-exhaust valve body 420 and a throttle 500.

[0038] See also Figure 2 , Figure 2 This is a structural schematic diagram of the valve body 200 provided in Example 1 of the present application, in which the valve body 200 is provided with a first cavity 210, a second cavity 220, an oil outlet 201, an oil inlet 202, a first oil discharge port 203, a first throttling channel 204, a jet channel 205, a second throttling channel 206, a second oil discharge port 208, a first accommodating cavity 210, a blocking block 211 and a second cavity 220.

[0039] See also Figure 3 , Figure 3 This is a structural diagram of the valve core 300 provided in Example 1 of the present application. A third cavity 311 , a main flow channel 312 , an oil inlet flow channel 313 and an oil outlet flow channel 314 are provided in the valve core 300 .

[0040] Please also refer to Figure 1 and Figure 4 , Figure 4 This is a structural diagram of the quick exhaust valve body 420 provided in Example 1 of the present application. The quick exhaust valve body 420 is provided with a first quick exhaust channel 421, a second quick exhaust channel 422, a third quick exhaust channel 423, a fourth quick exhaust channel 424 and a quick exhaust valve core channel 425.

[0041] In a cross-section perpendicular to the axis, the cross-sectional shape of the quick-exhaust valve core 410 is identical to the cross-sectional shape of the quick-exhaust valve core channel 425. In this embodiment, the quick-exhaust valve core 410 is a cylinder. In other embodiments, the quick-exhaust valve core 410 can be any polygonal body, and accordingly, the quick-exhaust valve core channel 425 is a polygonal channel that cooperates with the quick-exhaust valve core 410. The identical shape of the quick-exhaust valve core 410 and the quick-exhaust valve core channel 425 allows for a tighter fit. This tight fit results in a certain starting resistance for the quick-exhaust function. When the starting resistance is not reached, the speed of the valve core 300 is very low, the quick-exhaust function is not activated, and the valve core 300 does not accelerate.

[0042] Please also refer to Figures 1 to 4The baffle structure 100 is disposed within the first chamber 210. Preferably, the baffle structure 100 is a piezoelectric crystal. In some other embodiments, the baffle structure 100 may also be an electrically controlled displacement baffle or an electrically controlled angular displacement baffle. Piezoelectric crystals offer excellent control, enabling the speed control valve to quickly respond to and provide feedback on engine speed changes.

[0043] The valve core 300 is disposed in the second cavity 220 and contacts the valve body 200. When there is a difference in oil pressure between the two ends of the valve core 300, the valve core 300 can slide along the contact surface. Preferably, the valve core 300 is made of rubber and the valve body 200 is made of stainless steel.

[0044] The quick-exhaust valve core 410 and the quick-exhaust valve body 420 are disposed within the third chamber 311. The quick-exhaust valve core 410 is made of rubber, while the quick-exhaust valve body 420 is made of plastic. In some embodiments, the quick-exhaust valve core 410 is made of stainless steel, while the quick-exhaust valve body 420 is made of rubber. Alternatively, the quick-exhaust valve body 420 is made of stainless steel, while the quick-exhaust valve core 410 is made of rubber. In other embodiments, the quick-exhaust valve body 420 may be formed by stacking multiple layers.

[0045] The throttle 500 is disposed in the first throttling flow channel 204. Preferably, the throttle 500 is a screw, and the throttle 500 and the valve body 200 are threadedly engaged. In some other embodiments, a spring is further included between the throttle 500 and the valve body 200 to reset the throttle 500. In other embodiments, the throttle 500 can also be a throttle ball. By using springs of different stiffnesses, the throttle 500 will obtain different opening pressures. On the one hand, it can prevent the internal structure of the speed control valve from being damaged due to excessive pressure. On the other hand, since the speed of the valve core 300 is related to the pressure, it can also control the critical speed of the valve core 300.

[0046] Optionally, the valve body 200 further includes a second throttle channel 206, which connects the first throttle channel 204 and the oil tank. The throttle 500 controls the opening size of the connection between the first throttle channel 204 and the second throttle channel 206, thereby controlling the speed at which the oil flows from the second chamber 220 to the oil tank, thereby achieving a buffering effect.

[0047] The valve core 300 divides the second chamber 220 into two chambers: one away from the baffle structure 100 and one closer to the baffle structure 100. The first chamber 210 and the chamber closer to the baffle structure 100 are connected via the fluid channel 205. In a cross-section perpendicular to the axis, the cross-sectional area of the fluid channel 205 is smaller than that of both the first chamber 210 and the second chamber 220. By adjusting the position of the control baffle structure 100, the distance between the baffle structure 100 and the fluid channel 205 can be adjusted, thereby varying the oil pressure in the chamber closer to the baffle structure 100. This results in different pressures at the end of the valve core 300 closer to the baffle structure 100 and the end farther from the baffle structure 100, thereby controlling the movement of the valve core 300.

[0048] The main channel 312 connects the chamber on one side away from the baffle structure 100 and the chamber on the side close to the baffle structure 100, the oil inlet channel 313 connects the oil inlet 202 and the main channel 312, the other end of the oil inlet 202 is connected to the atmosphere, the oil outlet 201 connects the main channel 312 and the atmosphere, the second oil outlet 208 connects the first chamber 210 and the atmosphere, and the third chamber 311 connects the chamber on the side away from the baffle structure 100 and the main channel 312.

[0049] The first quick exhaust channel 421 connects the quick exhaust valve core channel 425 and the second quick exhaust channel 422. The second quick exhaust channel 422 connects the quick exhaust valve core channel 425, the first quick exhaust channel 421 and the second chamber 220. The third quick exhaust channel 423 connects the quick exhaust valve core channel 425, the fourth quick exhaust channel 424 and the second chamber 220. The fourth quick exhaust channel 424 connects the quick exhaust valve core channel 425, the third quick exhaust channel 423 and the main channel 312. The quick exhaust valve core 410 is disposed within the quick exhaust valve core channel 425. The quick exhaust valve core 410 divides the quick exhaust valve core channel 425 into two flow channels, with the second quick exhaust channel 422 and the third quick exhaust channel 423 respectively connecting to one of the flow channels. In some embodiments, in a cross-section perpendicular to the axis, the cross-sectional area of the third quick exhaust channel 423 is smaller than the cross-sectional area of the second quick exhaust channel 422.

[0050] Please also refer to Figure 2 and Figure 5 , Figure 5 for Figure 2In the structural diagram at A, a block block 211 is provided on the side of the first oil drain port 203 close to the second cavity 220, and a thread is provided on the side of the first oil drain port 203 away from the second cavity 220. Screws are also provided on the thread so that in the event of an operational abnormality, the first oil drain port 203 can be manually sealed to reduce the problem of excessive movement speed caused by abnormally fast draining. In this embodiment, the block block 211 is designed as an integral part of the valve body 200, and a plurality of oil drain pipes 212 are provided at the first oil drain port 203. The pores of the oil drain pipes 212 are smaller than those of the valve core 300. In some other embodiments, the block block 211 is a mesh film structure or a block structure with multiple pores.

[0051] Second embodiment:

[0052] See also Figure 6 , Figure 6 This is a schematic diagram of the structure of a high-speed responsive nozzle flapper speed regulating valve with controllable valve core motion provided in Example 2 of the present application. The structure of the high-speed responsive nozzle flapper speed regulating valve with controllable valve core motion includes a flapper structure 100, a valve body 200, a valve core 300, a quick-exhaust valve core 410, a quick-exhaust valve body 420, and a throttle 500.

[0053] See also Figure 7 , Figure 7 This is a structural schematic diagram of the valve body 200 provided in Example 2 of the present application, in which the valve body 200 is provided with a first cavity 210, a second cavity 220, an oil outlet 201, an oil inlet 202, a first oil drain port 203, a first throttling channel 204, a jet channel 205, a second throttling channel 206, a third channel 207, a second oil drain port 208, a first cavity 210 and a blocking block 211, wherein the second cavity 220 includes a first cavity 221, a second cavity 222, a third cavity 223 and a fourth cavity 224.

[0054] See also Figure 8 , Figure 8 This is a structural schematic diagram of the valve core 300 provided in Example 2 of the present application. A third cavity 311, a main channel 312, an oil inlet channel 313, an oil outlet channel 314, a first channel 315 and a second channel 316 are provided in the valve core 300. The valve core 300 includes a first valve core body 310 and a second valve core body 320. The oil inlet channel 313 includes a first oil inlet channel 317 and a second oil inlet channel 318.

[0055] Please also refer to Figure 8 and Figure 9 , Figure 9 This is a structural diagram of a quick exhaust valve body 420 provided in Example 2 of the present application. A first quick exhaust channel 421 , a second quick exhaust channel 422 , a third quick exhaust channel 423 , a fourth quick exhaust channel 424 and a quick exhaust valve core channel 425 are provided in the quick exhaust valve body 420 .

[0056] Please also refer to Figures 6 to 9 The baffle structure 100 is arranged in the first cavity 210, the valve core 300 is arranged in the second cavity 220, the quick exhaust valve body 420 is arranged in the third cavity 311, the quick exhaust valve core 410 is arranged in the quick exhaust valve core channel 425, and the throttle 500 is arranged in the first throttling channel 204.

[0057] The valve core 300 divides the second chamber 220 into two chambers: one on the side away from the baffle structure 100 and the other on the side close to the baffle structure 100. The first chamber 210 and the side close to the baffle structure 100 are connected through the jet channel 205. The main channel 312 connects the chamber on the side away from the baffle structure 100 and the chamber on the side close to the baffle structure 100. The oil inlet channel 313 connects the oil inlet 202 and the main channel 312. The other end of the oil inlet 202 is connected to the atmosphere. The oil outlet 201 connects the main channel 312 and the atmosphere. The second oil drain port 208 connects the first chamber 210 and the atmosphere. The third chamber 311 connects the chamber on the side away from the baffle structure 100 and the main channel 312.

[0058] The first quick exhaust channel 421 connects the quick exhaust valve core channel 425 and the second quick exhaust channel 422, the second quick exhaust channel 422 connects the quick exhaust valve core channel 425, the first quick exhaust channel 421 and the second cavity 220, the third quick exhaust channel 423 connects the quick exhaust valve core channel 425, the fourth quick exhaust channel 424 and the second cavity 220, the fourth quick exhaust channel 424 connects the quick exhaust valve core channel 425, the third quick exhaust channel 423 and the main channel 312, wherein the quick exhaust valve core 410 is arranged in the quick exhaust valve core channel 425, and the quick exhaust valve body 420 divides the quick exhaust valve core channel 425 into two flow channels, and the second quick exhaust channel 422 and the third quick exhaust channel 423 are respectively connected to one of the flow channels.

[0059] The valve body 200 also includes a third flow channel 207, which is located on a side of the valve body 200 near the baffle structure 100. The third flow channel 207 connects the chamber near the baffle structure 100 and the oil tank. A piezoelectric crystal, an electronically controlled throttle valve, or an electronically controlled relief valve is disposed within the third flow channel 207. The piezoelectric crystal provides better control, allowing the speed control valve to quickly respond to changes in engine speed.

[0060] From the side closest to the baffle structure 100 to the side further away from the baffle structure 100, the second chamber 220 further comprises, in order, a first chamber 221, a second chamber 222, a third chamber 223, and a fourth chamber 224. In a cross-section perpendicular to the axis, the cross-sectional areas of the first chamber 221, the second chamber 222, and the third chamber 223 are smaller than the cross-sectional area of the first chamber 221. The cross-sectional shapes of the first chamber 221 and the fourth chamber 224 are circular, while the cross-sectional shapes of the second chamber 222 and the third chamber 223 are annular. In some other embodiments, the second chamber 222 and the third chamber 223 may be polygonal chambers. The arrangement of the third chamber 223 and the fourth chamber 224 ensures that the space between the valve core 300 and the valve body 200 remains filled with oil at both extreme positions. Therefore, when the valve core 300 begins to move from its extreme positions, the close contact between the valve core 300 and the valve body 200 does not hinder the entry of oil.

[0061] The valve core 300 is arranged in the first cavity 221, the second cavity 222 and the third cavity 223. The valve core 300 includes a first valve core body 310 and a second valve core body 320. The cross-section of the first valve core body 310 is the same as the cross-section of the second cavity 222, and the cross-section of the second valve core body 320 is the same as the cross-section of the first cavity 221.

[0062] The valve core 300 also includes a first flow channel 315 and a second flow channel 316. The first flow channel 315 and the second flow channel 316 are disposed within the valve core 300. The first flow channel 315 connects the fourth quick exhaust channel 424 with the main channel 312, while the second flow channel 316 connects the second quick exhaust channel 422, the third quick exhaust channel 423, and the cavity on the side away from the baffle structure 100. Preferably, the length of the first flow channel 315 is shorter than that of the second flow channel 316. In a cross-section perpendicular to the axis, the cross-sectional area of the first flow channel 315 is greater than that of the second flow channel 316. The larger cross-sectional area and smaller length of the first flow channel 315 allow oil to flow initially into channel 311 and then through channel 424 to the side of the quick exhaust valve core 410 away from the baffle structure 100. This allows the quick exhaust valve core 410 to move more quickly toward the side closer to the baffle structure 100 during initial oil supply.

[0063] The oil inlet channel 313 includes a first oil inlet channel 317 and a second oil inlet channel 318. The cross-sectional shape of the first oil inlet channel 317 is identical to that of the oil outlet channel 314, ensuring that the flow rate of oil flowing from the first oil inlet channel 317 into the main channel 312 and from the main channel 312 into the oil outlet channel 314 is the same. The cross-sectional areas of the first oil inlet channel 317 and the oil outlet channel 314 are smaller than the cross-sectional area of the second oil inlet channel 318. The design of the second oil inlet channel 318 ensures that the valve core 300 remains in communication with the oil inlet 202 regardless of its position.

[0064] In this embodiment, the second quick exhaust passage 422 and the third quick exhaust passage 423 are connected at an end away from the quick exhaust valve core passage 425 , and are communicated with the second flow passage 316 .

[0065] The high-speed responsive nozzle flapper speed regulating valve with controllable valve core 300 motion in the second embodiment of the present application operates in two states: a non-oil supply state and an oil supply state. The oil supply states include an uncontrolled state, a state controlled by the flapper structure 100, a throttle control state, a quick exhaust control state, and a return state. The throttle control state and the quick exhaust control state can be enabled simultaneously, or only one of them can be enabled. A detailed description of each state is as follows:

[0066] When the high-speed responsive nozzle flapper speed regulating valve with controllable valve core 300 motion is not supplied with oil, the flapper structure 100 is not powered, and there is a distance between the flapper structure 100 and the fluidic channel 205. Oil can flow from the second chamber 220 through the fluidic channel 205 into the first chamber 210. The second throttling channel 206 and the third channel 207 are both disconnected from the oil tank, the second oil outlet 208 is connected to the oil tank, and the ends of the block 211 are connected to the second chamber 220 and the oil tank, respectively. In other words, no screws are provided at the first oil outlet 203. At this time, the valve core 300 is located on the side of the second chamber 220 away from the flapper structure 100.

[0067] When the high-speed response nozzle flapper speed regulating valve with controllable valve core 300 movement is in the uncontrolled state during the oil supply state, the initial state of each component is the same as the un-oiled state, and oil flows from the oil inlet 202 and fills the main channel 312. The oil flowing into the main channel 312 is divided into three branches. The oil in the first branch flows along the first channel 315 into the fifth quick exhaust channel 424 until it contacts the side of the quick exhaust valve core 410 away from the block block 211 and stops flowing due to the obstruction of the quick exhaust valve core 410. The oil in the second branch flows along the main channel 312 to fill the cavity on the side away from the flapper structure 100. The oil in the third branch flows along the main channel 312 to fill the cavity on the side close to the flapper structure 100. When the oil in the three branches fills the interior of the valve core, the oil in the first branch, under the action of the oil pressure, pushes the quick exhaust valve core 410 toward the side closer to the block block 211 until it abuts against the side of the quick exhaust valve core channel 425 closer to the block block 211. When the quick exhaust valve core 410 moves to the position where it abuts against the quick exhaust valve body 420, the third quick exhaust channel 423 and the fourth quick exhaust channel 424 are connected, and the first quick exhaust channel 421 and the second quick exhaust channel 422 are blocked by the quick exhaust valve body 420.

[0068] When the oil fills the cavity on the side away from the baffle structure 100, the oil flows from the second flow channel 316 into the connecting end of the second quick exhaust channel 422 and the third quick exhaust channel 423, and along the second quick exhaust channel 422, fills the side of the quick exhaust valve core 410 near the block 211. At this time, because the oil pressure on the side of the quick exhaust valve core 410 near the block 211 and the side away from the block 211 are the same, the quick exhaust valve core 410 does not move. When the oil fills the cavity on the side near the baffle structure 100, the oil flows through the jet channel 205 and fills the first cavity 210. When the oil fills the first cavity 210, it is discharged from the second oil outlet 208. At this time, the oil pressure on the side of the valve core 300 close to the baffle structure 100 is lower than the oil pressure on the side of the valve core 300 away from the baffle structure 100. Under the action of the oil, the valve core 300 moves toward the side close to the baffle structure 100 until it contacts the valve body 200. When the valve core 200 stops moving, the uncontrolled state ends.

[0069] During the movement of the valve core 300 toward the side close to the baffle structure 100, when the first valve core body 310 enters the second chamber 222, the first quick exhaust passage 421 is connected to the block block 211. Since the side of the quick exhaust valve core 410 close to the block block 211 is connected to the oil tank, the pressure on the side of the quick exhaust valve core 410 close to the block block is lower than the pressure on the side away from the block block 211, which will cause the quick exhaust valve core 410 to remain on the side of the quick exhaust valve core passage 425 close to the block block 211.

[0070] When the high-speed responsive nozzle flapper speed regulating valve with controllable valve core 300 movement is in the oil supply state and controlled by flapper structure 100, flapper structure 100 is energized, the distance between flapper structure 100 and fluid passage 205 decreases, and the oil flowing from fluid passage 205 into first chamber 210 increases in velocity, causing the pressure in second chamber 220 near flapper structure 100 to increase, causing valve core 300 to move away from flapper structure 100. When first valve core body 310 begins to enter second chamber 222, the control state of flapper structure 100 ends.

[0071] When the high-speed responsive nozzle flapper speed regulating valve with controllable valve core 300 movement is in the throttling control state within the oil supply state, the opening and closing of the throttle 500 corresponds to the opening and closing of the throttling control state. When the first valve core body 310 begins to move to the second chamber 222, the oil in the second and third chambers 222, 223 cannot flow out. As the valve core 300 continues to move, the oil pressure in the second and third chambers 222, 223 increases sharply until the throttle 500 opens. Because the throttle 500 acts as a throttle, i.e., the volume of oil flowing into the oil tank is limited, the oil pressure in the second and third chambers 222, 223 is greater than the oil pressure in the fourth chamber 224, thereby hindering the movement of the valve core 300. After the throttle 500 is opened, the valve core 300 moves rapidly at a constant speed, the speed of which is determined by the setting of the throttle 500. The throttle 500 controls the flow passage opening at the connection between the first throttle passage 204 and the second throttle passage 206 . The larger the opening, the faster the valve core 300 moves toward the side away from the baffle structure 100 .

[0072] A piezoelectric crystal, an electrically controlled throttle valve, or an electrically controlled relief valve is also disposed within the third flow channel 207 to control the size of the opening of the third flow channel 207. This controls the oil pressure on the side of the second chamber 220 near the baffle structure, thereby controlling the movement speed of the valve core 300. Specifically, when the valve core 300 moves toward the baffle structure 100, the larger the opening of the third flow channel 207, the faster the movement of the valve core 300. When the valve core 300 moves away from the baffle structure 100, the larger the opening of the third flow channel 207, the slower the movement of the valve core 300.

[0073] Since the oil discharge speed of the throttle 500 is limited and cannot meet the movement requirements of the valve core 300 even if it is opened to the maximum, the screw at 203 is unscrewed to open the quick discharge control state.

[0074] When the high-speed responsive nozzle flapper speed regulating valve with controllable valve core 300 movement is in the quick exhaust control state within the oil supply state, the oil pressure in the second and third chambers 222 and 223 reaches a certain value (i.e., the oil pressure in the second quick exhaust passage 422 is greater than the oil pressure in the fourth quick exhaust passage 424). This causes the oil to push the quick exhaust valve core 410 away from the block 211. When the quick exhaust valve core 410 moves to a position where it abuts the quick exhaust valve body 420, the first and second quick exhaust passages 421 and 422 are connected, while the third and fourth quick exhaust passages 423 and 424 are blocked by the quick exhaust valve core 410. At this point, the oil in the second and third chambers 222 and 223 flows sequentially through the second quick exhaust passage 422, the first quick exhaust passage 421, and the block 211, and then flows through the flow channel within the block 211 to the first oil discharge port 203, ultimately accumulating into the oil tank. Since the oil pressure in the oil tank is very low, the flow rate of the oil is very fast, so that the oil in the second chamber 222 and the third chamber 223 can be discharged quickly, thereby realizing the quick discharge function.

[0075] When the valve core 300 moves away from the baffle structure 100 and contacts the valve body 200, the oil outlet channel 314 communicates with the oil outlet 201. Oil from the oil inlet 202 flows through the second oil inlet channel 318, the first oil inlet channel 317, the main channel 312, and the oil outlet channel 314, and flows out of the oil outlet 201.

[0076] When the high-speed responsive nozzle flapper speed regulating valve with controllable valve core 300 movement is in the return stroke state within the oil supply state, the flapper structure 100 is de-energized, the distance between the flapper structure 100 and the fluidic channel 205 increases, and the pressure on the side of the second chamber 220 near the flapper structure 100 decreases, causing the valve core 300 to move toward the flapper structure 100. When the first valve core body 310 is located within the second chamber 222, the throttle 500 and the first oil drain port 203 are opened to control the speed of the valve core 300 movement. Specifically, the larger the throttle 500 opening, the slower the valve core 300 movement speed. Opening the first oil drain port 203 also reduces the speed of the valve core 300 movement. The return stroke state ends when the valve core 300 contacts the valve body 200.

[0077] Compared with the prior art, the present application controls the speed of change of the oil pressure at both ends of the speed control valve spool 300 by providing a throttle 500, a quick exhaust valve core 410, and a quick exhaust valve body 420, thereby controlling the speed of movement of the speed control valve spool 300. When the engine load changes significantly, the engine speed will also change significantly, thereby affecting the movement speed of the spool 300. When the engine load changes significantly, on the one hand, the movement speed between the control valve core 300 and the valve body 200 is controlled to change within a lower range, which can reduce the friction of the oil between the valve core 300 and the valve body 200, thereby reducing the heat generated by friction, allowing the oil to operate at a lower temperature, and thus ensuring that the working viscosity of the oil changes within the required working range. On the other hand, the rapid reduction in the movement speed between the control valve core 300 and the valve body 200 can prevent excessive impact between the valve core 300 and the valve body 200, thereby increasing the service life of the speed control valve. When the engine load changes slightly, increasing the speed of movement between the control valve core 300 and the valve body 200 can maintain a stable speed of the valve core 300, thereby maintaining continuous movement of the valve core 300 and extending the service life of the valve core 300. Therefore, the speed control valve provided by the present application can quickly and effectively ensure that the hydraulic speed control device can stably adjust the speed, while reducing the heat generated by friction between the valve core 300 and the valve wall, thereby extending the service life of the device.

[0078] The embodiments described above are merely descriptions of preferred implementation methods of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements made to the technical solutions of the present application by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present application.

Claims

1. A high-speed response nozzle flapper speed regulating valve with controllable valve core movement, characterized in that: The invention comprises a baffle structure, a valve body, a valve core, a quick exhaust valve core, a quick exhaust valve body and a throttle, wherein a first cavity, a second cavity, an oil outlet, an oil inlet, a first oil exhaust port, a first throttling flow channel, a jet flow channel and a second oil exhaust port are provided in the valve core, a third cavity, a main flow channel, an oil inlet flow channel and an oil outlet flow channel are provided in the valve core, a first quick exhaust channel, a second quick exhaust channel, a third quick exhaust channel, a fourth quick exhaust channel and a quick exhaust valve core channel are provided in the quick exhaust valve body, the baffle structure is arranged in the first cavity, the valve core is arranged in the second cavity, the quick exhaust valve body is arranged in the third cavity, the quick exhaust valve core is arranged in the quick exhaust valve core channel, and the throttle is arranged in the first throttling flow channel; The valve core divides the second cavity into two cavities, one of which is a cavity on the side away from the baffle structure and the other is a cavity on the side close to the baffle structure. The first cavity and the cavity on the side close to the baffle structure are connected through the jet channel. The main channel connects the cavity on the side away from the baffle structure and the cavity on the side close to the baffle structure. The oil inlet channel connects the oil inlet and the main channel. The other end of the oil inlet is connected to the atmosphere. The oil outlet connects the main channel and the atmosphere. The second oil discharge port connects the first cavity and the atmosphere. The third cavity connects the cavity on the side away from the baffle structure, the first oil discharge port, and the main channel. The first quick exhaust channel is connected to the quick exhaust valve core channel and the second quick exhaust channel, the second quick exhaust channel is connected to the quick exhaust valve core channel, the first quick exhaust channel and the second cavity, the third quick exhaust channel is connected to the quick exhaust valve core channel, the fourth quick exhaust channel and the second cavity, the fourth quick exhaust channel is connected to the quick exhaust valve core channel, the third quick exhaust channel and the main channel, the quick exhaust valve core divides the quick exhaust valve core channel into two flow channels, and the second quick exhaust channel and the third quick exhaust channel are respectively connected to one of the flow channels; The valve core has two working positions, which are described as follows: When the valve core is in the first working position, the first quick exhaust passage is connected to the first oil exhaust port, and the oil outlet passage is connected to the oil outlet port; When the valve core is in the second working position, the first quick exhaust passage and the first oil exhaust port are disconnected, and the oil outlet passage and the oil outlet port are disconnected.

2. The high-speed response nozzle flapper speed regulating valve with controllable valve core movement according to claim 1, characterized in that: A spring is further provided between the throttle and the valve body. The throttle is a throttle ball, and the baffle structure is a piezoelectric crystal.

3. The high-speed response nozzle flapper speed regulating valve with controllable valve core movement according to claim 1, characterized in that: In a cross section perpendicular to the axis, a cross-sectional area of the third fast exhaust channel is smaller than a cross-sectional area of the second fast exhaust channel.

4. The high-speed response nozzle flapper speed regulating valve with controllable valve core movement according to claim 1, characterized in that: It also includes a first flow channel and a second flow channel, wherein the first flow channel and the second flow channel are opened in the valve core, wherein the first flow channel connects the fourth quick exhaust channel and the main channel, and the second flow channel connects the second quick exhaust channel, the third quick exhaust channel and the side of the second cavity away from the baffle structure.

5. The high-speed response nozzle flapper speed regulating valve with controllable valve core movement according to claim 4, characterized in that: A cross-sectional area of the first flow channel is greater than a cross-sectional area of the second flow channel.

6. The high-speed response nozzle flapper speed regulating valve with controllable valve core movement according to claim 1, characterized in that: It also includes a third flow channel, which is opened on the side of the valve body close to the baffle structure. The third flow channel connects the side of the second cavity close to the baffle structure and the oil tank. A piezoelectric crystal or an electrically controlled throttle valve or an electrically controlled overflow valve is arranged in the third flow channel.

7. The high-speed response nozzle flapper speed regulating valve with controllable valve core movement according to claim 1, characterized in that: From the side close to the baffle structure to the side away from the baffle structure, the second cavity further includes a first cavity, a second cavity, a third cavity and a fourth cavity in sequence. The valve core is arranged in the first cavity. The valve core includes a first valve core body and a second valve core body. On the cross section perpendicular to the axis, the cross-sectional area of the second cavity, the third cavity and the first cavity is smaller than the cross-sectional area of the first cavity. The cross-sectional shape of the first valve core body is the same as the cross-sectional shape of the second cavity, and the cross-sectional shape of the second valve core body is the same as the cross-sectional shape of the first cavity.

8. The high-speed response nozzle flapper speed regulating valve with controllable valve core movement according to claim 1, characterized in that: A blocking block is further provided in the first oil drain port, and the blocking block is provided on a side close to the second cavity.

9. The high-speed response nozzle flapper speed regulating valve with controllable valve core movement according to claim 8, characterized in that: The blocking block is a mesh film structure or a block structure with a plurality of pores, or a plurality of through holes are provided on the valve body.

10. The high-speed response nozzle flapper speed regulating valve with controllable valve core movement according to claim 8, characterized in that: It also includes a screw, and a thread is provided on a side of the first oil drain port away from the second cavity, and the screw is used to cooperate with the thread.

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