Eccentric throttle valve

Abstract

The present invention discloses an eccentric throttle valve, which comprises a valve body; a driving mechanism is arranged at the top of the valve body; a pipe joint is arranged in the air inlet cavity of the valve body, and a valve seat component is arranged at the connection part between the air inlet cavity and the air outlet cavity of the valve body; a valve disc is arranged on the valve seat component, a rotating shaft is arranged on the valve disc, and the top of the rotating shaft is connected with the driving mechanism. Among them, an elastic part is arranged at the connection end of the valve seat component and the valve disc; the working stroke of the valve disc is 0° to 90°; the valve disc center line of the valve disc is coaxial with the valve seat component central axis of the valve seat component, and a rotation center fixing part connected with the rotating shaft is arranged on the back of the valve disc, and the center of the rotation center fixing part is eccentric in the radial direction with respect to the valve disc center line and the rotating shaft axis of the rotating shaft; the pipe joint is a horn-shaped rotating body and the large-diameter end is arranged facing the valve seat component, and the pipe joint rotation axis of the pipe joint is eccentric with respect to the valve disc center line and the rotating shaft axis of the rotating shaft in the radial direction respectively. The present invention not only has precise control of the intake air flow, but also has almost zero internal leakage volume.

Description

Technical Field

[0001] The present invention relates to the technical field of throttle valves, and particularly to an eccentric throttle valve capable of fully controlling the gas flow rate in the intake pipe. Background Art

[0002] An electronic throttle valve (Electrical Throttle valve Control) is an electric continuously position-adjustable and controllable valve assembly used to control the entry of fresh air into the engine, and controls the intake air flow rate of the engine by controlling the opening degree of the valve.

[0003] The electronic throttle valve is divided into a normally closed structure and a normally open structure. In the normally closed structure, in the natural state, under the action of the return spring, the valve plate plane is perpendicular to the axis of the valve flow passage, and the flow area of the entire valve is the smallest; in the normally open structure, in the natural state, under the action of the return spring, the valve plate plane is parallel to the axis of the valve flow passage, and the flow area of the entire valve is the largest.

[0004] The electronic throttle valve is generally driven by a DC motor, and directly drives the valve plate to rotate by reducing and increasing the torque through a speed reduction gear train. However, due to limitations in processing, assembly processes, etc. of the existing electronic throttle valve, the valve plate and the valve body cannot be completely fitted without clearance, resulting in the sealing performance in the fluid chamber being difficult to meet the safety requirements that the internal leakage amount is almost zero when the intake path of new energy, especially hydrogen energy, is shut off. Therefore, an electronic throttle valve that can meet the safety requirements that the internal leakage amount is almost zero when the intake path of new energy, especially hydrogen energy, is shut off is an urgent problem to be solved by those skilled in the art at the present stage. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an eccentric throttle valve that can meet the safety requirements that the internal leakage amount is almost zero when the intake path of new energy, especially hydrogen energy, is shut off.

[0006] To solve the above technical problem, the following technical solutions are adopted in the present invention.

[0007] Eccentric throttle valve, comprising a valve body; a gear chamber is provided at the top of the valve body, and a driving mechanism is provided inside the gear chamber; a pipe joint is provided in the air inlet chamber of the valve body, and a valve seat component is provided at the connection between the air inlet chamber and the air outlet chamber of the valve body; a valve disc is provided on the valve seat component, a rotating shaft is provided on the valve disc, and the top of the rotating shaft penetrates into the gear chamber and is connected to the driving mechanism. Among them, an elastic part for closely fitting with the sealing surface of the outer circle of the valve disc is provided at the connection end of the valve seat component with the valve disc; the driving mechanism drives the rotating shaft to rotate to drive the working stroke of the valve disc to be 0° - 90°; the center line of the valve disc of the valve disc is coaxial with the central axis of the valve seat component of the valve seat component, and a rotation center fixing part connected to the rotating shaft is provided on the back of the valve disc, and the center of the rotation center fixing part is eccentric in the radial direction with respect to the valve disc center line and the axis of the rotating shaft of the rotating shaft; the pipe joint is a trumpet-shaped rotating body, the large-diameter end of the pipe joint faces the valve seat component, and the rotation axis of the pipe joint is eccentric with respect to the valve disc center line and the axis of the rotating shaft of the rotating shaft in the radial direction.

[0008] Preferably, the axis of the rotating shaft is concentric with the center of the rotation center fixing part of the valve disc, and the rotating shaft is a smooth round shaft without eccentric steps and without crank.

[0009] Preferably, the minimum inner pipe radius of the pipe joint is less than the distance from the center of the axis of the rotating shaft of the rotating shaft to the farthest end of the outer edge of the valve disc and greater than the radius of the valve disc.

[0010] Preferably, an inner ring cylindrical surface is provided on the valve seat component, and the center line of the inner ring cylindrical surface is located on the central axis of the valve seat component; an installation hole is provided on the front surface of the valve disc, and the center line of the installation hole is located on the valve disc center line to realize uniform extrusion and close fitting between the elastic part and the sealing surface.

[0011] Preferably, the elastic part and the valve seat component are an inseparable whole.

[0012] Preferably, an arc surface coaxial with the valve disc center line is provided on the rotation center fixing part.

[0013] Preferably, a needle roller bearing is provided at the top of the valve body, and the top of the rotating shaft penetrates through the needle roller bearing; a ball bearing is provided at the bottom of the valve body, a shaft shoulder is provided on the bottom end shaft of the rotating shaft, the shaft shoulder is arranged on the inner ring of the ball bearing, a threaded hole is axially opened at the center of the bottom end of the rotating shaft, and a screw is threadedly connected to the threaded hole, and a gasket is sleeved on the nut end of the screw and is located between the nut and the ball bearing.

[0014] Preferably, a grease seal structure is provided on the needle roller bearing, and the grease seal structure is two lip seals arranged at intervals; a bowl-shaped plug for sealing is provided at the bottom of the valve body.

[0015] Preferably, the driving mechanism includes a DC motor, an intermediate gear, and a driven gear; a motor gear is provided on the rotating shaft of the DC motor; the intermediate gear meshes with the motor gear and the driven gear respectively; the driven gear is assembled on the rotating shaft.

[0016] Due to the adoption of the above technical solutions, the technological progress achieved by the present invention is as follows.

[0017] By providing a valve plate with a working stroke of 0° to 90° and being eccentric, the present invention can achieve precise control of the intake air flow; by providing elastic parts, when the valve plate is in the fully closed state, the sealing performance in the fluid chamber is improved, which can better meet the safety requirements that the internal leakage is almost zero when the intake path of new energy, especially hydrogen energy, is shut off; by arranging the rotating shaft in the valve body with needle bearings and ball bearings and locking the screws and gaskets, the axial up-and-down movement of the rotating shaft can be effectively prevented; by providing an oil seal structure on the needle bearing and a cup plug at the bottom of the valve body, the gas leakage into the atmosphere can be effectively reduced, and thus it can be ensured that the intake air can be effectively utilized under the current conditions of large displacement and large intake pressure in engines, new energy fuel cells, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of the present invention;

[0019] Figure 2 is a longitudinal sectional view of the present invention;

[0020] Figure 3 is a schematic structural view of the gear chamber of the present invention;

[0021] Figure 4 is a schematic view of the valve plate of the present invention;

[0022] Figure 5 is a schematic view of the fully open valve of the present invention;

[0023] Figure 6 is a schematic view of the open valve of the present invention;

[0024] Figure 7 is a schematic structural view of the needle bearing with an oil seal structure of the present invention;

[0025] Figure 8 is a schematic structural view of the axial positioning of the rotating shaft of the present invention.

[0026] Wherein: 1. Rotating shaft, 1a. Shoulder, 2. Valve disc, 2a. Sealing surface, 2b. Mounting hole surface, 2c. Front surface, 2d. Rotation center fixing part, 2e. Arc surface, 2f. First side of valve disc, 3. Valve seat component, 3a. Elastic part, 3c. Inner ring cylindrical surface, 4. Valve body, 4a. Pipe joint, 4b. Valve seat component mounting end face, 4c. Mechanical dead point, 5. DC motor, 6. Intermediate gear, 7. Driven gear, 8. Gear chamber, 9. Needle bearing, 10. Ball bearing, 11. Cup plug, 12. Screw, 13. Gasket, L1. Center line of valve disc, L2. Axis of rotating shaft, L3. Central axis of valve seat component, L4. Rotation axis of pipe joint, r. Minimum inner pipe radius of pipe joint, R. Distance from center of rotating shaft axis to the farthest end of outer edge of valve disc, G1. Minimum height of first fluid passage, G2. Minimum height of second fluid passage, A1. First minimum flow area, A2. Second minimum flow area, D1. Inner cavity flow aperture, D2. Throat diameter. Detailed implementation mode

[0027] The present invention will be further described in detail below in conjunction with the drawings and specific implementation modes.

[0028] An eccentric throttle valve, combined with Figures 1 to 2 As shown, it includes a valve body 4, a gear chamber 8 is arranged at the top of the valve body 4, and a driving mechanism is arranged inside the gear chamber 8; a pipe joint 4a is arranged in the air inlet cavity of the valve body 4; a valve seat component 3 is arranged at the communication part of the air inlet cavity and the air outlet cavity of the valve body 4, a valve disc 2 is arranged on the valve seat component 3, a rotating shaft 1 is arranged on the valve disc 2, and the top of the rotating shaft 1 penetrates into the gear chamber 8 and is connected with the driving mechanism.

[0029] As Figure 3 As shown, the driving mechanism includes a DC motor 5, an intermediate gear 6 and a driven gear 7. Among them, the DC motor 5 is used as a power source, which has the characteristics of fast response time and can work at 360°. A motor gear is arranged on the output shaft of the DC motor 5; the intermediate gear 6 is used to amplify and transmit torque, and is meshed with the motor gear and the driven gear 7 respectively; the driven gear 7 is assembled on the rotating shaft 1, so as to realize the torque amplification of the DC motor 5 and transmit it to the valve disc 2 through the rotating shaft 1. A return spring is also arranged between the rotating shaft 1 and the gear chamber 8, and the return spring is used to balance the rotational torque of the DC motor 5, and further stabilize the opening degree of the valve disc 2 on the rotating shaft 1. An EGR valve sensor component is also arranged in the gear chamber 8.

[0030] A needle bearing 9 is arranged at the top of the valve body 4. The rotating shaft 1 is a smooth round shaft without eccentric steps and without crank. The top of the rotating shaft 1 passes through the needle bearing 9 and is assembled with the driven gear 7. As Figure 8As shown in the figure, in order to ensure that the rotating shaft 1 does not move axially, a ball bearing 10 is provided at the bottom of the valve body 4. The outer ring of the ball bearing 10 is fixedly connected to the valve body 4. An axial shoulder 1a is provided on the bottom end shaft of the rotating shaft 1, and the axial shoulder 1a is arranged on the inner ring of the ball bearing 10. A threaded hole is axially opened at the center of the bottom end of the rotating shaft 1, and a screw 12 is threadedly connected to the threaded hole. A gasket 13 is sleeved on the nut end of the screw 12, and the gasket 13 is located between the nut and the ball bearing 10. After assembly, when the rotating shaft 1 moves upward, because the valve body 4 is in contact with the ball bearing 10, and the rotating shaft 1 is respectively located at both end faces of the ball bearing 10 through the axial shoulder 1a and the gasket 13, and the screw 12 is used to integrate the rotating shaft 1 and the ball bearing 10, the rotating shaft 1 is fixed on the inner ring of the ball bearing 10, which can effectively prevent the rotating shaft 1 from moving axially up and down. Such a structural design not only has fewer components, reduces frictional losses, but also has high reliability.

[0031] As Figure 7 shown, an oil seal structure is provided on the needle roller bearing 9. The oil seal structure is two lip seals arranged at intervals, and the lips of the lip seals are lined with metal skeletons. Among them, the sealing function of the first lip seal is to seal gas. The lip of the first lip seal is arranged downward. After being subjected to the gas pressure of the intake air, it will cause the lip of the first lip seal to tightly adhere to the rotating shaft 1. The greater the pressure, the tighter the adhesion, and the better the sealing effect. The second lip seal is used to seal the gas that may leak out and the grease of the needle roller bearing 9. The lip of the second lip seal is arranged upward. Even if some gas passes through the first lip seal, the second seal will continue to seal. A bowl-shaped plug 11 is provided at the bottom of the valve body 4, and the bowl-shaped plug 11 seals from the bottom of the rotating shaft 1. During use, the oil seal structure can control the gas from leaking into the interior of the gear chamber 8, and the bowl-shaped plug 11 can control the gas from leaking out from the bottom, thereby effectively reducing the gas leakage into the atmosphere, and further ensuring that the intake air can be effectively utilized under the current conditions of large displacement and large intake pressure of new energy fuel cells in engines.

[0032] A valve seat component installation end face 4b is provided at the connection between the intake chamber and the exhaust chamber of the valve body 4. The inner end of the valve seat component 3 is tightly attached to the valve seat component installation end face 4b. The inner end of the valve seat component 3 is connected to the valve plate 2, and an elastic part 3a is provided. The elastic part 3a and the valve seat component 3 are an integral whole and cannot be disassembled. An inner ring cylindrical surface 3c is provided on the valve seat component 3, and the center line of the inner ring cylindrical surface 3c is located on the valve seat component central axis L3 of the valve seat component 3.

[0033] The valve disc 2 is in the shape of a circular plate, and the sealing surface 2a of its outer ring is in close contact with the elastic part 3a. When the valve disc 2 is in the fully closed state, the sealing surface 2a of the outer ring of the valve disc 2 is located at the installation end surface 4b of the valve seat component. A mounting hole is provided on the front surface 2c of the valve disc 2, and the center line of the mounting hole is located on the valve disc center line L1 of the valve disc 2. The valve disc center line L1 is coaxial with the center axis L3 of the valve seat component, thereby achieving uniform extrusion and close contact between the elastic part 3a and the sealing surface 2a.

[0034] A rotation center fixing portion 2d is provided on the back of the valve disc 2, and the rotation center fixing portion 2d is connected to the rotating shaft 1, so that the valve disc 2 is directly assembled on the rotating shaft 1. After assembly, the center of the rotation center fixing portion 2d is concentric with the rotating shaft axis L2 of the rotating shaft 1; the center of the rotation center fixing portion 2d is eccentric with the valve disc center line L1 and the valve seat component center axis L3 in the radial direction.

[0035] The valve plate 2 has a working stroke of 0° to 90° driven by the rotating shaft 1 and has only one mechanical stop point 4c. Figure 3 As shown, the mechanical stop point 4c is the full-open stop point, and the flow rate is the largest in the full-open state. For new energy fuel cells that pursue small volume, the flow rate must be fully utilized to avoid pressure difference loss, so the full-open angle is strictly controlled at 90°. Based on this, the rotating shaft 1 is as shown in FIG. Figure 5 As shown, the valve is rotated 90° clockwise, at which time the valve is in a fully closed state, the valve plate 2 is pressed tightly against the elastic part 3a, and the sealing performance of the valve plate 2 is improved, which can meet the sealing requirements of new energy sources.

[0036] like Figure 4 As shown, the rotation center fixing portion 2d is Figure 4 The viewing angle shape is approximately a rectangle. Since the center of the rotation center fixing portion 2d (i.e., the rotation axis L2) is radially eccentric to the valve plate center line L1, it is convenient to realize the sealing surface 2a, the mounting hole surface 2b, and the front surface 2c of the valve plate 2 during rotation processing. Figure 4 The viewing angle shape retains an arc surface 2e that is coaxial with the valve plate center line L1. The arc surface 2e is used for rotationally processing the sealing surface 2a, the mounting hole surface 2b and the front surface 2c of the valve plate 2 as a fixed reference, which not only saves processing costs, but also has high rotation processing accuracy and higher reliability.

[0037] The pipe joint 4a is a trumpet-shaped rotating body, which is used to connect the pipe of the gas introduced from the outside. Figure 6As shown, the large-diameter end of the flare of the pipe joint 4a faces the valve seat component 3, and the pipe joint rotation axis L4 of the pipe joint 4a is radially eccentric to the valve plate center line L1 of the valve plate 2 and the rotation axis L2 of the rotating shaft 1. The purpose of this design is to ensure that during the operation of the valve plate 2, the minimum height G2 and the minimum flow area A2 of the second fluid passage formed by the first side 2f of the valve plate 2 and the elastic part 3a are always smaller than the minimum height G1 and the minimum flow area A2 of the first fluid passage formed by the first side 2f of the valve plate 2 and the inner wall of the pipe joint 4a; and the inner cavity flow aperture D1 of the pipe joint 4a is less than twice the distance R from the center of the rotation axis to the farthest end of the outer edge of the valve plate, but greater than the orifice diameter D2 of the elastic part 3a (as Figure 1 shown, that is, the minimum inner pipe radius r of the pipe joint 4a is less than the distance R from the center of the rotation axis of the rotating shaft 1 to the farthest end of the outer edge of the valve plate and greater than the radius of the valve plate 2). The parameters of the fluid inner cavity of the valve body 4 that affect the fluid flow rate are the minimum height G2 and the minimum flow area A2 of the second fluid passage formed by the first side 2f of the valve plate 2 and the elastic part 3a. Thus, by controlling the opening of the valve plate 2, the corresponding flow rate can be obtained, and the flow rate curve of the valve plate 2 from 0° to 90° is a monotonically increasing smooth curve, so as to achieve precise control of the intake air flow rate.

[0038] In the production of the present invention, first, the valve seat component 3 is pressed into the valve body 4; then, the rotating shaft 1 is pressed into the ball bearing 10, and the screw 12 and the gasket 13 are locked; then, the rotating shaft 1 that has been pressed into the ball bearing 10 is placed into the valve body 4 into which the valve seat component 3 has been pressed; next, the needle bearing 9 is pressed in turn, the valve plate 2 is inserted onto the rotating shaft 1, so that the valve plate 2 is in the fully closed position, and a tooling is used to ensure that the center of the valve plate coincides with the center of the valve seat component, and the valve plate 2 and the rotating shaft 1 are welded and fixed; secondly, the return spring and the passive gear 7 are installed, and the valve plate 2 is rotated to the fully open position as Figure 5 shown, the passive gear 7 is closely attached to the mechanical dead center 4c position. In this state, the rotating shaft 1 and the passive gear 7 are welded and fixed, and then the DC motor 5 is installed and fixed according to Figure 3 the position, the idler gear 6 is meshed with the passive gear 7 and the motor gear, and finally the EGR valve sensor component is installed.

[0039] When the present invention is in use, the working stroke of the valve disc 2 is 0° to 90°. By adopting the design that the valve disc center line L1 of the valve disc 2 is coaxial with the valve seat component center axis L3 of the valve seat component 3, the center of the rotation center fixing part 2d is radially eccentric with respect to the valve disc center line L1 and the valve seat component center axis L3, and the pipe joint rotation axis L4 of the pipe joint 4a is radially eccentric with respect to the valve disc center line L1 and the rotation axis L2 of the rotating shaft 1 respectively, precise control of the intake air flow can be achieved; through the provided elastic part 3a, when the valve disc 2 is in the fully closed state, the sealing performance in the fluid cavity is improved, which can better meet the safety requirements that when the intake path of new energy, especially hydrogen energy, is shut off, the internal leakage is almost zero; by arranging the rotating shaft 1 in the valve body 4 with needle bearings 9 and ball bearings 10 and locking the screw 12 and the gasket 13, the axial up-and-down movement of the rotating shaft 1 can be effectively prevented; through the oil seal structure arranged on the needle bearing 9 and the cup plug 11 arranged at the bottom of the valve body 4, the gas leakage into the atmosphere can be effectively reduced, and thus it can be ensured that under the current conditions of large displacement and large intake pressure in engine new energy fuel cells, etc., the intake air can also be effectively utilized.

Claims

1. Eccentric throttle valve, comprising a valve body (4); a gear chamber (8) is provided at the top of the valve body (4), and a driving mechanism is provided inside the gear chamber (8); a pipe joint (4a) is provided in the intake chamber of the valve body (4), and a valve seat component (3) is provided at the connection between the intake chamber and the outlet chamber of the valve body (4); a valve disc (2) is provided on the valve seat component (3), a rotating shaft (1) is provided on the valve disc (2), and the top of the rotating shaft (1) penetrates into the gear chamber (8) and is connected to the driving mechanism, characterized in that: An elastic part (3a) for closely attaching to the sealing surface (2a) on the outer circle of the valve disc (2) is arranged at the connection end of the valve seat part (3) and the valve disc (2); the working stroke of the valve disc (2) driven by the driving mechanism to drive the rotating shaft (1) to rotate is 0° to 90°; the valve disc center line (L1) of the valve disc (2) is coaxial with the valve seat part central axis (L3) of the valve seat part (3), a rotation center fixing part (2d) connected to the rotating shaft (1) is arranged on the back of the valve disc (2), and the center of the rotation center fixing part (2d) is eccentric in the radial direction with respect to the valve disc center line (L1) and the valve seat part central axis (L3); the pipe joint (4a) is a horn-shaped rotating body, the large-diameter end of the pipe joint (4a) faces the valve seat part (3) and the pipe joint rotation axis (L4) of the pipe joint (4a) is eccentric with respect to the valve disc center line (L1) and the rotation axis (L2) of the rotating shaft (1) in the radial direction; the minimum inner pipe radius (r) of the pipe joint (4a) is less than the distance (R) from the center of the rotation axis of the rotating shaft (1) to the farthest end of the outer edge of the valve disc and greater than the radius of the valve disc (2). An inner circle cylindrical surface (3c) is arranged on the valve seat part (3), and the center line of the inner circle cylindrical surface (3c) is located on the valve seat part central axis (L3); an installation hole is arranged on the front surface (2c) of the valve disc (2), and the center line of the installation hole is located on the valve disc center line (L1) to realize the uniform extrusion and close attachment of the elastic part (3a) and the sealing surface (2a).

2. The eccentric throttle valve according to claim 1, characterized in that: The rotation axis (L2) of the rotating shaft (1) is concentric with the center of the rotation center fixing part (2d) of the valve disc (2), and the rotating shaft (1) is a smooth circular shaft without eccentric steps and cranks.

3. The eccentric throttle valve according to claim 1, characterized in that: The elastic part (3a) and the valve seat part (3) are an inseparable whole.

4. The eccentric throttle valve according to claim 1, characterized in that: An arc surface (2e) coaxial with the valve disc center line (L1) is arranged on the rotation center fixing part (2d).

5. The eccentric throttle valve according to claim 1, wherein: A needle roller bearing (9) is arranged at the top of the valve body (4), and the top of the rotating shaft (1) is arranged in the needle roller bearing (9); a ball bearing (10) is arranged at the bottom of the valve body (4), a shoulder (1a) is arranged on the bottom end shaft of the rotating shaft (1), the shoulder (1a) is arranged on the inner ring of the ball bearing (10), a threaded hole is axially arranged at the center of the bottom end of the rotating shaft (1), and a screw (12) is threadedly connected to the threaded hole, and a gasket (13) is sleeved on the nut end of the screw (12) and is located between the nut and the ball bearing (10).

6. The eccentric throttle valve according to claim 5, characterized in that: An oil seal structure is arranged on the needle roller bearing (9), and the oil seal structure is two lip-shaped sealing rings arranged at intervals; a bowl-shaped plug (11) for sealing is arranged at the bottom of the valve body (4).

7. The eccentric throttle valve according to claim 1, characterized in that: The driving mechanism includes a DC motor (5), an intermediate gear (6) and a driven gear (7); a motor gear is arranged on the rotating shaft of the DC motor (5); the intermediate gear (6) is respectively meshed with the motor gear and the driven gear (7); the driven gear (7) is assembled on the rotating shaft (1).

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