A throttle valve for a high pressure common rail fuel system

Abstract

The present invention provides a throttle valve for a high-pressure common rail fuel system applied to the field of throttle valves. The throttle valve is achieved by fixing a cylinder at the center position of the right end of a hydraulic chamber, and slidingly installing an auxiliary valve plate and a valve ring inside and outside the cylinder respectively. With the help of a driving component, continuous and stable oil supply or oil extraction operations are performed to the hydraulic chamber and the right end of the cylinder. The movement mode of the auxiliary valve plate and the valve ring can be controlled by changing the oil supply and extraction directions, which is conducive to instantaneous large-scale adjustment or small-scale fine adjustment of the movement of the valve core according to actual needs, and to a certain extent improves the flexibility of the throttle valve during use, so that it responds promptly during adjustment and has high adjustment accuracy.

Description

Technical Field

[0001] The present application relates to the field of throttle valves, and in particular to a throttle valve for a high-pressure common rail fuel system. Background Art

[0002] A throttle valve is a valve that controls the flow of a fluid by changing the throttle section or throttle length. It is widely used in today's pipeline systems and can flexibly adjust the flow rate of materials in the pipeline system according to actual usage requirements. A throttle valve is installed in a high-pressure common rail fuel system. By adjusting the throttle valve, the fuel supply can be flexibly changed according to actual working conditions, which is conducive to a more rational use of fuel, thereby achieving the purpose of saving fuel and avoiding energy waste.

[0003] In the prior art, when the throttle valve in the high-pressure common rail fuel system is adjusted, the movement speed of the valve core is usually kept constant at the same rate, and the adjustment mode cannot be flexibly switched according to actual needs. Although the opening and closing adjustment of the valve core in the constant mode can maintain the adjustment stability of the throttle valve as much as possible, it is impossible to quickly adjust and control the valve core in time when facing emergencies. If the valve core is not opened and closed in time during the adjustment process, it is easy to increase the duration of fuel supply errors, affecting the stability of the high-pressure common rail fuel system during operation.

[0004] Therefore, a throttle valve for a high pressure common rail fuel system is proposed to solve some problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present application is to solve the problem that the throttle valve core adjustment mode in the high-pressure common rail fuel system in the prior art is single, the opening and closing speed and the opening and closing accuracy cannot be flexibly adjusted according to actual needs, and the fuel supply stability of the fuel system is affected. Compared with the prior art, a throttle valve for a high-pressure common rail fuel system is provided, including a main valve body, a valve cavity is provided inside the main valve body, an oil inlet connected to the valve cavity is provided on the left end wall of the main valve body, an oil outlet connected to the valve cavity is provided on the front end wall of the main valve body, a valve core sliding left and right is installed inside the valve cavity, a hydraulic cavity located on the right side of the valve cavity is provided inside the main valve body, and the valve The right end of the core is fixedly connected with a connecting rod which is movable and penetrates into the hydraulic chamber, and the right end of the connecting rod is connected with a main valve plate which matches the internal size of the hydraulic chamber, a cylinder is installed inside the hydraulic chamber on the right side of the main valve plate, and the central axis of the cylinder coincides with the central axis of the hydraulic chamber, an auxiliary valve plate which matches the internal size of the cylinder is slidably installed inside the cylinder, and a valve ring which matches the internal size of the hydraulic chamber is slidably installed on the outer side of the cylinder, the hydraulic chamber is filled with hydraulic oil which is located between the main valve plate, the auxiliary valve plate and the valve ring, and a driving assembly for controlling the left and right movement of the auxiliary valve plate and the valve ring is installed on the right side of the hydraulic chamber.

[0006] By fixing the cylinder at the center of the right end of the hydraulic chamber, and slidingly installing an auxiliary valve plate and a valve ring inside and outside the cylinder respectively, the driving component can be used to continuously and stably supply oil or pump oil to the hydraulic chamber and the right end of the cylinder. The movement mode of the auxiliary valve plate and the valve ring can be controlled by changing the direction of oil supply and pumping, which is beneficial to instantaneously adjust the movement of the valve core by a large amplitude or by a small amplitude and fine adjustment according to actual needs, and to a certain extent improves the flexibility of the throttle valve during use, so that it responds promptly during adjustment and has high adjustment accuracy.

[0007] Furthermore, the left inner end wall of the valve cavity is configured as a funnel-shaped structure, the oil inlet is connected to the center of the funnel-shaped structure, and the left end of the valve core is configured as a conical structure adapted to the left inner end wall of the valve cavity.

[0008] Furthermore, the main valve body is vertically divided into left and right parts from the middle position of the valve cavity. A sealing gasket is clamped between the left and right parts of the main valve body. The left and right parts of the main valve body are fastened together by bolts, and internal threads are formed on the inner end walls of the oil inlet and the oil outlet by tapping.

[0009] Furthermore, a pointer located outside the oil inlet is engraved on the left end wall of the main valve body, and the arrow of the pointer is pointing toward the center of the oil inlet. A pointer located outside the oil outlet is also engraved on the front end wall of the main valve body, and the arrow of the pointer is pointing away from the center of the oil outlet.

[0010] Optionally, the drive assembly includes a pipeline sub-control module and a hydraulic oil supply module connected to the end of the pipeline sub-control module, the pipeline sub-control module includes a rear cover plate sealed at the right end of the hydraulic chamber, and a T-shaped channel is opened inside the rear cover plate, the upper end of the T-shaped channel extends upward and is connected to the hydraulic oil supply module, the left end of the T-shaped channel is connected to the right end of the cylinder, and the right end of the T-shaped channel is connected to the right end of the hydraulic chamber, a miniature solenoid valve is fixedly installed inside the T-shaped channel, and the hydraulic oil supply module performs stable oil supply or oil extraction operations into the T-shaped channel.

[0011] Furthermore, the right end of the hydraulic chamber passes through the right end wall of the main valve body, the rear cover plate covers the right end wall of the main valve body and is fixedly connected by bolts, a sealing gasket is also clamped between the main valve body and the rear cover plate, and the cylinder is fixedly welded to the rear cover plate.

[0012] Furthermore, the right end of the T-shaped channel is fixedly connected to a diversion chamber opened in the rear cover plate, and the diversion chamber and the right end of the hydraulic chamber are connected to multiple diversion channels opened in the rear cover plate, and the multiple diversion channels are distributed around the outside of the hydraulic chamber and the diversion chamber.

[0013] Furthermore, the hydraulic oil supply module includes a hydraulic supply box installed on the main valve body and the top of the rear cover plate, and a valve block matching the internal dimensions of the hydraulic supply box is slidably installed inside the hydraulic supply box, a transversely arranged screw is rotatably installed at the middle position of the hydraulic supply box, and the screw passes through the center position of the valve block and is threadedly connected to the valve block, a micro motor located on the left side of the hydraulic supply box is installed on the top of the main valve body, and the drive shaft of the micro motor is transmission-connected to the screw, and a circular hole corresponding to the top of the T-shaped channel is opened on the right side of the bottom of the hydraulic supply box.

[0014] Furthermore, the hydraulic supply box is fastened to the main valve body and the top of the rear cover plate by bolts. The bolts are located at the four corners of the hydraulic supply box, two of which are fastened to the top of the main valve body, and the other two are fastened to the top of the rear cover plate. A rubber sealing ring is clamped between the round hole and the top of the T-shaped channel.

[0015] Optionally, a plug rod is movably inserted into the right end of the connecting rod, and the right end of the plug rod is fixedly welded to the middle position of the left end wall of the main valve plate. A spring is movably sleeved on the outer side of the connecting rod, and the spring is elastically supported on the right end of the valve core and the right inner end wall of the valve cavity.

[0016] Compared with the prior art, the advantages of this application are:

[0017] (1) The present application fixes the cylinder at the center of the right end of the hydraulic chamber, and slides the auxiliary valve plate and the valve ring inside and outside the cylinder respectively. With the help of a driving assembly, the hydraulic chamber and the right end of the cylinder are continuously and stably supplied with oil or pumped out with oil. The movement mode of the auxiliary valve plate and the valve ring can be controlled by changing the direction of supplying and pumping oil, which is conducive to instantaneous large-scale adjustment or small-scale fine adjustment of the movement of the valve core according to actual needs, thereby improving the flexibility of the throttle valve during use to a certain extent, making it respond promptly during adjustment and having high adjustment accuracy.

[0018] (2) By setting the left inner end wall of the valve cavity as a funnel-shaped structure and connecting the oil inlet to the center of the funnel-shaped structure, when the fuel enters the valve cavity through the oil inlet, it directly impacts the left end of the valve core. With the help of the cone structure on the left end of the valve core to disperse the incoming fuel, the impact of high-pressure impact on the valve core can be reduced, which is conducive to ensuring that the valve core is stable under pressure and not easily deformed, thereby prolonging the service life of the throttle valve to a certain extent.

[0019] (3) By dividing the main valve body into two left and right parts from the middle position of the valve cavity, the main valve body can be disassembled from the middle position of the valve cavity, which is convenient for inspection and maintenance of the internal structure of the valve cavity and can effectively reduce the manufacturing difficulty of the throttle valve.

[0020] (4) By engraving direction marks on the outside of the oil inlet and the oil outlet, the connection direction of the throttle valve and the oil pipe in the fuel system can be guided, reducing the probability of incorrect connection direction, which is conducive to improving the installation convenience of the throttle valve.

[0021] (5) The rear cover plate is covered on the right end of the main valve body by bolt connection to seal the right port of the hydraulic chamber, so that the main valve body and the rear cover plate can be flexibly disassembled, which is convenient for inspection and maintenance of the structure in the hydraulic chamber, and can also reduce the manufacturing difficulty of the throttle valve.

[0022] (6) By distributing a plurality of flow diversion channels around the hydraulic chamber and the flow diversion chamber, the hydraulic oil in the flow diversion chamber flows into the hydraulic chamber in a more uniform direction, which is beneficial to ensuring the stability of the valve ring when it is pushed by the supplied hydraulic oil.

[0023] (7) The hydraulic supply box is fixedly installed on the top of the main valve body and the rear cover plate by bolts, so as to realize the modular disassembly and assembly of the throttle valve, which is conducive to reducing its processing difficulty. At the same time, the bolts used to fix the hydraulic supply box are respectively fastened on the top of the main valve body and the rear cover plate, so that the connection between the main valve body and the rear cover plate can be reinforced from above, thereby further improving the tightness of the connection between the main valve body and the rear cover plate.

[0024] (8) By movably sleeved the connecting rod on the plug rod fixed at the left end of the main valve plate, and elastically supporting the spring between the valve core and the right inner end wall of the valve cavity, the valve core maintains a tendency to move to the left under normal conditions and closes with the left inner end wall of the valve cavity, thus achieving one-way flow restriction, which is beneficial to avoid backflow during the fuel supply process and ensures the stability of the fuel flow direction in the fuel system to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a split diagram of this application;

[0026] Figure 2 A perspective view of the present application;

[0027] Figure 3 A perspective view of the internal structure of this application;

[0028] Figure 4 This is the front view of the application;

[0029] Figure 5 for Figure 4 Sectional view at AA in the middle;

[0030] Figure 6 for Figure 5 Schematic diagram of the middle structure in working state;

[0031] Figure 7 for Figure 4 Sectional view at the middle BB;

[0032] Figure 8 A top view of the present application;

[0033] Fig. 9 for Figure 8 Sectional view at CC;

[0034] Fig.10 for Figure 8 Sectional view at DD in the middle.

[0035] Description of the numbers in the figure:

[0036] 1. Main valve body; 101. Valve chamber; 102. Oil inlet; 103. Oil outlet; 2. Valve core; 201. Hydraulic chamber; 202. Connecting rod; 203. Main valve plate; 204. Cylinder; 205. Auxiliary valve plate; 206. Valve ring; 3. Back cover; 301. T-channel; 302. Diverter chamber; 303. Diverter channel; 304. Micro solenoid valve; 4. Hydraulic supply box; 401. Valve block; 402. Screw; 403. Micro motor; 5. Sealing gasket; 6. Insert rod; 601. Spring. DETAILED DESCRIPTION

[0037] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present application.

[0038] Example 1

[0039] The present invention provides a throttle valve for a high pressure common rail fuel system. Figure 1 - Fig.10, including a main valve body 1, a valve cavity 101 is provided inside the main valve body 1, an oil inlet 102 connected to the valve cavity 101 is provided on the left end wall of the main valve body 1, an oil outlet 103 connected to the valve cavity 101 is provided on the front end wall of the main valve body 1, a valve core 2 sliding left and right is installed inside the valve cavity 101, a hydraulic cavity 201 located on the right side of the valve cavity 101 is provided inside the main valve body 1, a connecting rod 202 movably penetrating into the hydraulic cavity 201 is fixedly connected to the right end of the valve core 2, and a main valve plate 203 adapted to the internal size of the hydraulic cavity 201 is connected to the right end of the connecting rod 202, and the hydraulic A cylinder 204 located on the right side of the main valve plate 203 is installed inside the pressure chamber 201, and the central axis of the cylinder 204 coincides with the central axis of the hydraulic chamber 201, an auxiliary valve plate 205 matching its internal dimensions is slidably installed inside the cylinder 204, a valve ring 206 matching the internal dimensions of the hydraulic chamber 201 is slidably installed outside the cylinder 204, the hydraulic chamber 201 is filled with hydraulic oil located between the main valve plate 203 and the auxiliary valve plate 205 and the valve ring 206, and a drive assembly for controlling the left and right movement of the auxiliary valve plate 205 and the valve ring 206 is installed on the right side of the hydraulic chamber 201.

[0040] During actual use of the throttle valve, the staff installed the throttle valve in a high-pressure common rail fuel system so that the oil inlet 102 is connected to the oil inlet pipe of the fuel system, and the fuel enters the throttle valve through the oil inlet 102 and is discharged from the oil outlet 103. At the same time, the electronic control unit on the throttle valve needs to be connected to a power supply through a wire to provide power support for its operation. When the throttle valve is working, the valve core 2 moves left and right to adjust the open gap in the valve cavity 101, so as to control the fuel flow rate flowing through the pipeline, and the movement adjustment of the valve core 2 is achieved by moving the main valve plate 203. The auxiliary valve plate 205 and the valve ring 206 can move left and right together under the control of the drive component, and can also move left and right independently. The drive component also controls the movement of the cylinder 204 and the auxiliary valve plate 205 by supplying and withdrawing hydraulic oil. The amount of hydraulic oil supplied by the drive component to the auxiliary valve plate 205 and the valve ring 206 is continuous and stable.

[0041] When hydraulic oil is supplied to the right side of the auxiliary valve plate 205 inside the cylinder 204, the auxiliary valve plate 205 moves to the left under the push of the supplied hydraulic oil. Due to the conduction of hydraulic oil between the main valve plate 203 and the cylinder 204 and the auxiliary valve plate 205, the main valve plate 203 moves to the left, and the moving distance is equal to the moving distance of the auxiliary valve plate 205. When the same unit of hydraulic oil is supplied to the right side of the valve ring 206 inside the hydraulic chamber 201 and the right side of the auxiliary valve plate 205 inside the cylinder 204, the right hydraulic oil simultaneously pushes the auxiliary valve plate 205 and the valve ring 206 to move. Since the inner diameter of the filling space is converted from the inner diameter of the cylinder 204 to the inner diameter of the hydraulic chamber 201, the cylinder 204 and the auxiliary valve plate 205 move to the left synchronously when the amount of supplied hydraulic oil remains unchanged, and the leftward displacement becomes smaller, which also reduces the leftward displacement of the main valve plate 203, and the movement of the main valve plate 203 can be controlled more finely.

[0042] The present application fixes the cylinder 204 at the center of the right end of the hydraulic chamber 201, and slides the auxiliary valve plate 205 and the valve ring 206 inside and outside the cylinder 204 respectively, and uses the driving component to continuously and stably supply oil or pump oil to the hydraulic chamber 201 and the right end of the cylinder 204. The movement mode of the auxiliary valve plate 205 and the valve ring 206 can be controlled by changing the direction of supplying and pumping oil, which is beneficial to instantaneously adjust the movement of the valve core 2 by a large amplitude or by a small amplitude and fine adjustment according to actual needs, and to a certain extent improves the flexibility of the throttle valve during use, so that it responds promptly during adjustment and has high adjustment accuracy.

[0043] See also Figure 3 , Figure 5 and Figure 6 The left inner end wall of the valve cavity 101 is set as a funnel-shaped structure, the oil inlet 102 is connected to the center position of the funnel-shaped structure, and the left end of the valve core 2 is set as a conical structure adapted to the left inner end wall of the valve cavity 101. In actual use, the throttle valve sets the left inner end wall of the valve cavity 101 as a funnel-shaped structure, and connects the oil inlet 102 to the center position of the funnel-shaped structure, so that when the fuel enters the valve cavity 101 through the oil inlet 102, it directly impacts the left end of the valve core 2. With the help of the cone structure on the left end of the valve core 2 to disperse the incoming fuel, the impact of high-pressure impact on the valve core 2 can be reduced, which is conducive to ensuring that the valve core 2 is stable under pressure and not easy to deform, thereby improving the service life of the throttle valve to a certain extent.

[0044] See also Figure 1 , Figure 5 and Fig. 9The main valve body 1 is vertically divided into left and right parts from the middle position of the valve cavity 101, and a sealing gasket 5 is clamped between the left and right parts of the main valve body 1. The left and right parts of the main valve body 1 are fastened together by bolts, and internal threads are formed on the inner end walls of the oil inlet 102 and the oil outlet 103 by tapping. In actual use of the throttle valve, the main valve body 1 is divided into left and right parts from the middle position of the valve cavity 101, so that the main valve body 1 can be disassembled from the middle position of the valve cavity 101, which is convenient for inspection and maintenance of the internal structure of the valve cavity 101, which is conducive to improving the convenience of inspection and maintenance of the throttle valve, and can effectively reduce the difficulty of manufacturing the throttle valve. At the same time, by clamping the sealing gasket 5 between the left and right parts of the main valve body 1, it is conducive to improving its sealing tightness. By opening internal threads in the oil inlet 102 and the oil outlet 103, the oil pipe in the fuel system can be connected to the throttle valve by threaded connection, which improves the convenience of connection and use of the throttle valve to a certain extent.

[0045] See also Figure 2 The left end wall of the main valve body 1 is engraved with a pointer located on the outside of the oil inlet 102, and the arrow of the pointer is pointing to the center of the oil inlet 102. The front end wall of the main valve body 1 is also engraved with a pointer located on the outside of the oil outlet 103, and the arrow of the pointer is pointing away from the center of the oil outlet 103. In actual use of the throttle valve, by engraving pointers on the outside of the oil inlet 102 and the oil outlet 103, the connection direction of the throttle valve and the oil pipe in the fuel system can be guided, thereby reducing the probability of incorrect connection direction, which is conducive to improving the installation convenience of the throttle valve.

[0046] Example 2

[0047] The present invention provides a throttle valve for a high pressure common rail fuel system. Figure 1 - Fig.10 The driving component includes a pipeline sub-control module and a hydraulic oil supply module connected to the end of the pipeline sub-control module. The pipeline sub-control module includes a rear cover plate 3 blocked at the right end of the hydraulic chamber 201, and a T-shaped channel 301 is opened inside the rear cover plate 3. The upper end of the T-shaped channel 301 extends upward and is connected to the hydraulic oil supply module. The left end of the T-shaped channel 301 is connected to the right end of the cylinder 204, and the right end of the T-shaped channel 301 is connected to the right end of the hydraulic chamber 201. A micro solenoid valve 304 is fixedly installed inside the T-shaped channel 301, and the hydraulic oil supply module performs stable oil supply or oil extraction operations into the T-shaped channel 301.

[0048] In actual use of the throttle valve, the hydraulic oil supply module supplies or extracts hydraulic oil to the inside of the T-shaped channel 301 through the upper end thereof. When only the auxiliary valve plate 205 needs to be controlled to move, the micro solenoid valve 304 installed inside the right end of the T-shaped channel 301 is closed. At this time, the upper end of the T-shaped channel 301 is only connected to the left end of the T-shaped channel 301. The supply or extraction operation of the hydraulic oil supply module only acts on the auxiliary valve plate 205 in the cylinder 204. When it is needed, the micro solenoid valve 304 installed inside the right end of the T-shaped channel 301 is closed. To assist the valve plate 205 and the valve ring 206 to move synchronously, it is only necessary to control the micro solenoid valve 304 installed inside the right end of the T-shaped channel 301 to open, so that the upper end of the T-shaped channel 301 is connected to its left and right ends at the same time. At this time, the supply and extraction operations of the hydraulic oil supply module on the hydraulic oil will act synchronously on the right side of the auxiliary valve plate 205 and the valve ring 206, controlling the auxiliary valve plate 205 and the valve ring 206 to move synchronously, thereby realizing flexible control of the movement status of the auxiliary valve plate 205 and the valve ring 206.

[0049] See also Figure 1 and Fig. 9 The right end of the hydraulic chamber 201 passes through the right end wall of the main valve body 1, and the rear cover plate 3 covers the right end wall of the main valve body 1 and is fixedly connected by bolts. A sealing gasket 5 is also clamped between the main valve body 1 and the rear cover plate 3. The cylinder 204 is fixedly welded to the rear cover plate 3. During actual use of the throttle valve, the rear cover plate 3 covers the right end of the main valve body 1 by bolt connection to seal the right port of the hydraulic chamber 201, so that the main valve body 1 and the rear cover plate 3 can be flexibly disassembled, which is convenient for maintenance of the structure in the hydraulic chamber 201, and can also reduce the manufacturing difficulty of the throttle valve.

[0050] See also Figure 3 The right end of the T-shaped channel 301 is fixedly connected to a diverter chamber 302 opened in the rear cover plate 3, and the diverter chamber 302 and the right end of the hydraulic chamber 201 are connected to a plurality of diverter channels 303 opened in the rear cover plate 3. The plurality of diverter channels 303 are distributed around the outside of the hydraulic chamber 201 and the diverter chamber 302. During actual use of the throttle valve, the plurality of diverter channels 303 are distributed around the hydraulic chamber 201 and the diverter chamber 302, so that the hydraulic oil in the diverter chamber 302 is supplied to the hydraulic chamber 201 in a more uniform direction, which is beneficial to ensure the stability of the valve ring 206 when it is pushed by the hydraulic oil.

[0051] See also Figure 1 , Figure 7 and Fig. 9The hydraulic oil supply module includes a hydraulic supply box 4 installed on the top of the main valve body 1 and the rear cover plate 3, and a valve block 401 adapted to its internal size is slidably installed inside the hydraulic supply box 4, a transversely arranged screw 402 is rotatably installed at the middle position of the hydraulic supply box 4, and the screw 402 passes through the center position of the valve block 401 and is threadedly connected to the valve block 401, a micro motor 403 located on the left side of the hydraulic supply box 4 is installed on the top of the main valve body 1, and the drive shaft of the micro motor 403 is transmission-connected to the screw 402, and a T-shaped channel 30 is opened on the right side of the bottom of the hydraulic supply box 4 1. In actual use of the throttle valve, the micro motor 403 is powered on to start, driving the screw 402 connected to its drive shaft to rotate, and the left and right movement of the valve block 401 is controlled by the threaded connection between the screw 402 and the valve block 401. When the valve block 401 moves to the right in the hydraulic supply box 4, it pushes the hydraulic oil into the T-shaped channel 301 to realize the supply of the hydraulic oil. When the valve block 401 moves to the left in the hydraulic supply box 4, it sucks the hydraulic oil in the T-shaped channel 301 into the hydraulic supply box 4 to realize the withdrawal of the hydraulic oil.

[0052] See also Figure 1 The hydraulic supply box 4 is fastened to the top of the main valve body 1 and the rear cover plate 3 by bolts. The bolts are located at the four corners of the hydraulic supply box 4, two of which are fastened to the top of the main valve body 1, and the other two are fastened to the top of the rear cover plate 3. A rubber sealing ring is clamped between the round hole and the top of the T-channel 301. During actual use of the throttle valve, the hydraulic supply box 4 is fixedly installed on the top of the main valve body 1 and the rear cover plate 3 by bolts, so as to realize modular disassembly and assembly of the throttle valve, which is conducive to reducing its processing difficulty. At the same time, the bolts used to fix the hydraulic supply box 4 are fastened to the top of the main valve body 1 and the rear cover plate 3 respectively, so that the connection between the main valve body 1 and the rear cover plate 3 can be reinforced from above, and the tightness of the connection between the main valve body 1 and the rear cover plate 3 can be further improved.

[0053] This embodiment 2 refers to embodiment 1 and forms differences based on embodiment 1. Only the differences are described here.

[0054] Example 3

[0055] The present invention provides a throttle valve for a high pressure common rail fuel system. Figure 1 - Fig.10The right end of the connecting rod 202 is movably inserted with the plug rod 6, and the right end of the plug rod 6 is fixedly welded to the middle position of the left end wall of the main valve plate 203. The outer side of the connecting rod 202 is movably sleeved with a spring 601, and the spring 601 is elastically supported on the right end of the valve core 2 and the right inner end wall of the valve chamber 101. In actual use of the throttle valve, the connecting rod 202 is movably sleeved on the plug rod 6, and the plug rod 6 is fixedly connected to the main valve plate 203, which makes the existence of the plug rod 6 to cooperate with the main valve plate 203 to limit the right movement limit position of the valve core 2. When the high-pressure fuel enters from the oil inlet 102, the valve core 2 is pushed to the right, so that the valve core 2 overcomes the elastic supporting force of the spring 601 and moves to the right to open. By moving the main valve plate 203, the plug rod 6 is driven to move, and the opening amplitude of the valve core 2 is controlled. Adjustment, and when the fuel supply at the oil inlet 102 is lost, the high-pressure push when the fuel enters is lost, and under the elastic support of the spring 601, the left end of the valve core 2 is tightly fitted with the left inner end wall of the valve cavity 101. At this time, the fuel at the oil outlet 103 cannot flow back to the oil inlet 102 through the valve cavity 101, thereby ensuring the stability of the fuel supply direction. By movably sleeved the connecting rod 202 on the plug rod 6 fixed at the left end of the main valve plate 203, and elastically supporting the spring 601 between the valve core 2 and the right inner end wall of the valve cavity 101, the valve core 2 maintains a tendency to move leftward under normal conditions and is closed with the left inner end wall of the valve cavity 101, thereby realizing one-way flow restriction, which is beneficial to avoiding backflow during the fuel supply process and, to a certain extent, ensuring the stability of the fuel flow direction in the fuel system.

[0056] This embodiment 3 refers to embodiment 2 and forms differences based on embodiment 2. Only the differences are described here.

[0057] The above are only the best implementation methods adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. A throttle valve for a high-pressure common rail fuel system, comprising a main valve body (1), characterized in that: The main valve body (1) has a valve cavity (101) formed inside, an oil inlet (102) connected to the valve cavity (101) formed on the left end wall of the main valve body (1), an oil outlet (103) connected to the valve cavity (101) formed on the front end wall of the main valve body (1), a valve core (2) slidable left and right is installed inside the valve cavity (101), a hydraulic cavity (201) located on the right side of the valve cavity (101) is formed inside the main valve body (1), a connecting rod (202) movably penetrating into the hydraulic cavity (201) is fixedly connected to the right end of the valve core (2), and a main valve plate (203) having an internal size matching that of the hydraulic cavity (201) is connected to the right end of the connecting rod (202). A cylinder (204) located on the right side of the main valve plate (203) is installed inside the hydraulic chamber (201), and the central axis of the cylinder (204) coincides with the central axis of the hydraulic chamber (201). An auxiliary valve plate (205) matching the internal dimensions of the cylinder (204) is slidably installed inside the cylinder (204), and a valve ring (206) matching the internal dimensions of the hydraulic chamber (201) is slidably installed outside the cylinder (204). The hydraulic chamber (201) is filled with hydraulic oil located between the main valve plate (203), the auxiliary valve plate (205) and the valve ring (206). A driving component for controlling the left and right movement of the auxiliary valve plate (205) and the valve ring (206) is installed on the right side of the hydraulic chamber (201).

2. A throttle valve for a high pressure common rail fuel system according to claim 1, characterized in that: The left inner end wall of the valve cavity (101) is configured as a funnel-shaped structure, the oil inlet (102) is connected to the center of the funnel-shaped structure, and the left end of the valve core (2) is configured as a conical structure that matches the left inner end wall of the valve cavity (101).

3. A throttle valve for a high pressure common rail fuel system according to claim 1, characterized in that: The main valve body (1) is vertically divided into left and right parts from the middle position of the valve cavity (101), a sealing gasket (5) is clamped between the left and right parts of the main valve body (1), the left and right parts of the main valve body (1) are fastened together by bolts, and the inner end walls of the oil inlet (102) and the oil outlet (103) are both formed with internal threads by tapping.

4. A throttle valve for a high pressure common rail fuel system according to claim 1, characterized in that: The left end wall of the main valve body (1) is engraved with a pointer located outside the oil inlet (102), and the arrow of the pointer points toward the center of the oil inlet (102). The front end wall of the main valve body (1) is also engraved with a pointer located outside the oil outlet (103), and the arrow of the pointer points in a direction away from the center of the oil outlet (103).

5. A throttle valve for a high pressure common rail fuel system according to claim 1, characterized in that: The drive assembly comprises a pipeline sub-control module and a hydraulic oil supply module connected to the end of the pipeline sub-control module. The pipeline sub-control module comprises a rear cover plate (3) sealed at the right end of the hydraulic chamber (201), and a T-shaped channel (301) is provided inside the rear cover plate (3). The upper end of the T-shaped channel (301) extends upward and is connected to the hydraulic oil supply module. The left end of the T-shaped channel (301) is connected to the right end of the cylinder (204), and the right end of the T-shaped channel (301) is connected to the right end of the hydraulic chamber (201). A micro electromagnetic valve (304) is fixedly installed inside the T-shaped channel (301). The hydraulic oil supply module performs a stable oil supply or oil extraction operation into the T-shaped channel (301).

6. A throttle valve for a high pressure common rail fuel system according to claim 5, characterized in that: The right end of the hydraulic chamber (201) passes through the right end wall of the main valve body (1); the rear cover plate (3) covers the right end wall of the main valve body (1) and is fixedly connected by bolts; a sealing gasket (5) is also clamped between the main valve body (1) and the rear cover plate (3); and the cylinder (204) is fixedly welded to the rear cover plate (3).

7. A throttle valve for a high pressure common rail fuel system according to claim 6, characterized in that: The right end of the T-shaped channel (301) is fixedly connected to a flow diversion chamber (302) provided in the rear cover plate (3), and the flow diversion chamber (302) and the right end of the hydraulic chamber (201) are connected to a plurality of flow diversion channels (303) provided in the rear cover plate (3), wherein the plurality of flow diversion channels (303) are distributed around the outside of the hydraulic chamber (201) and the flow diversion chamber (302).

8. A throttle valve for a high pressure common rail fuel system according to claim 6, characterized in that: The hydraulic oil supply module comprises a hydraulic supply box (4) mounted on the top of the main valve body (1) and the rear cover plate (3), and a valve block (401) matching the internal dimensions of the hydraulic supply box (4) is slidably mounted inside the hydraulic supply box (4), a transversely arranged screw rod (402) is rotatably mounted at the middle position of the hydraulic supply box (4), and the screw rod (402) passes through the center position of the valve block (401) and is threadedly connected to the valve block (401), a micro motor (403) located on the left side of the hydraulic supply box (4) is mounted on the top of the main valve body (1), and a drive shaft of the micro motor (403) is transmission-connected to the screw rod (402), and a circular hole corresponding to the top of the T-shaped channel (301) is opened on the right side of the bottom of the hydraulic supply box (4).

9. A throttle valve for a high pressure common rail fuel system according to claim 8, characterized in that: The hydraulic supply box (4) is fastened to the top of the main valve body (1) and the rear cover plate (3) by bolts, the bolts being located at the four corners of the hydraulic supply box (4), two of which are fastened to the top of the main valve body (1), and the other two are fastened to the top of the rear cover plate (3), and a rubber sealing ring is clamped between the circular hole and the top of the T-shaped channel (301).

10. A throttle valve for a high pressure common rail fuel system according to claim 1, characterized in that: The right end of the connecting rod (202) is movably inserted with an insertion rod (6), and the right end of the insertion rod (6) is fixedly welded to the middle position of the left end wall of the main valve plate (203). The outer side of the connecting rod (202) is movably sleeved with a spring (601), and the spring (601) is elastically supported on the right end of the valve core (2) and the right inner end wall of the valve chamber (101).

Images