Valve sealing structure and electric controlled throttle valve

Abstract

A valve sealing structure includes a valve body, a valve core, a sealing ring, a mounting bracket, an elastic ring, a wave spring, and a pressure applying part. The valve core is rotatably mounted on the valve body. The sealing ring is mounted on the mounting bracket, which has a fluid passage hole along the axial direction. The elastic ring is disposed between the mounting bracket and the wave spring, with its front end in sealing contact with the rear end of the mounting bracket and its outer peripheral surface in sealing contact with the inner surface of the valve body. The wave spring is bellows-shaped, with its front end abutting against the rear end of the elastic ring. The pressure applying part abuts against the rear end of the wave spring to apply an axial pressure to the wave spring. This axial pressure is transmitted to the sealing ring through the elastic ring and the mounting bracket, causing the sealing ring to tightly adhere to the surface of the valve core. This invention maintains good sealing performance even in high and low temperature environments and under conditions of cumulative assembly and part dimensional deviations.

Description

Technical Field

[0001] The present invention relates to valve technology. Background Art

[0002] In order to reduce fuel consumption (CO 2 In order to reduce emissions), shorten the engine warm-up time, and improve the reliability of the engine, it is necessary to use an electronically controlled throttle valve to manage the engine thermally. The electronically controlled throttle valve is usually installed on the engine cylinder block. It adopts a mechatronic design with a compact system and high integration. It accurately controls the angle of the low-resistance ball valve through a high-efficiency actuator driven by a DC motor and a high-precision inductive position sensor, thereby realizing on-demand control of the flow in each branch of the cooling system. Through precise temperature control, the electronically controlled throttle valve can improve the working efficiency of the engine and other components, thereby minimizing friction losses and improving thermal efficiency, reducing fuel consumption and carbon dioxide emissions, shortening the engine warm-up time, and improving the reliability of the engine.

[0003] Most of the existing electric control throttle valves use sealing rings to achieve the seal between the valve core and the valve body. When working, the sealing ring is squeezed by the valve body and the valve core. Since the sealing ring will harden under high and low temperature conditions, and the compression force varies greatly with the size, the sealing effect will deteriorate under high and low temperature conditions. In addition, the existing electric control throttle valve has no assembly direction adjustment structure. In the case of large assembly and parts cumulative deviation, the central axis of the sealing ring and the central axis of the valve core through hole will not be in a straight line, which will lead to sealing failure. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a valve sealing structure and an electric-controlled throttle valve thereof, which can maintain a good sealing effect in high and low temperature environments and in the presence of cumulative deviations in assembly and parts dimensions.

[0005] Another technical problem to be solved by the present invention is to provide a valve sealing structure and an electrically controlled throttle valve thereof, which can adjust the position of the sealing ring in the presence of cumulative deviations in assembly and part dimensions so that the central axis of the sealing ring is consistent with the central axis of the valve core fluid opening.

[0006] A sealing structure of a valve in an embodiment of the present invention comprises a valve body, a valve core and a sealing ring, wherein the valve core is rotatably arranged on the valve body, and is characterized in that the sealing structure also comprises a sealing ring, a mounting bracket, an elastic ring, a wave spring and a pressure applying part, wherein the sealing ring, the mounting bracket, the elastic ring, the wave spring and the pressure applying part are respectively arranged in the valve body; the sealing ring is installed on the mounting bracket, and the mounting bracket is provided with a fluid through hole in the axial direction; the elastic ring is arranged between the mounting bracket and the wave spring, the front end face of the elastic ring is in sealing contact with the rear end of the mounting bracket, and the outer peripheral surface of the elastic ring is in sealing contact with the inner surface of the valve body; the wave spring is in a bellows shape, and the front end of the wave spring abuts against the rear end of the elastic ring; the pressure applying part abuts against the rear end of the wave spring to apply an axial pressure to the wave spring, and the axial pressure is transmitted to the sealing ring through the elastic ring and the mounting bracket, so that the sealing ring is tightly attached to the surface of the valve core.

[0007] Furthermore, a first annular protrusion is provided on the outer circumferential surface of the elastic ring, and a first annular groove matching with the first annular protrusion is provided on the inner surface of the valve body, and the first annular protrusion is embedded in the first annular groove.

[0008] Furthermore, a second annular protrusion is provided on the front end surface of the elastic ring, and the second annular protrusion abuts against the rear end of the mounting bracket.

[0009] Furthermore, a second annular groove is provided on the rear end face of the mounting bracket, and the second annular groove surrounds the fluid through hole; a forward end face of the elastic ring is provided with an annular flange protruding forward, and the annular flange extends into the second annular groove, and the width of the annular flange is smaller than the groove width of the second annular groove, so that the mounting bracket can move in the radial direction relative to the elastic ring.

[0010] The present invention has at least the following advantages:

[0011] 1. The sealing structure of this embodiment adopts a wave spring and an elastic ring to compress the sealing ring to seal. On the one hand, the elastic coefficient K value of the wave spring is small, and the force fluctuation caused by the change of compression amount due to the cumulative deviation of assembly and part size is small. On the other hand, the wave spring is made of metal material, and the elastic modulus changes little under high and low temperature conditions. Therefore, the wave spring provides a stable pre-tightening force to the sealing ring after compression. The sealing ring fits tightly to the valve core under the action of the pre-tightening force, ensuring that the friction torque between the sealing ring and the valve core will not change due to high and low temperatures and the cumulative deviation of assembly and part size, thereby ensuring the reliability of the seal;

[0012] 2. The front end surface of the elastic ring is provided with an annular flange protruding forward, and the annular flange extends into the second annular groove of the mounting bracket, so that the mounting bracket can be moved and adjusted in radial bidirectional directions relative to the elastic ring, ensuring that the cumulative deviation of the valve core during the assembly process and the cumulative deviation of the parts can be compensated by the movement adjustment amount, and there will be no leakage caused by the central axis of the sealing ring being inconsistent with the central axis of the fluid opening of the valve core due to assembly deviation;

[0013] 3. The first annular protrusion arranged on the outer circumference of the elastic ring is radially compressed and deformed after assembly, and forms an interference seal with the first annular groove on the inner surface of the valve body, thereby ensuring radial sealing;

[0014] 4. The wave spring provides compression force to the elastic ring. The second annular protrusion on the front end face of the elastic ring presses against the rear end face of the mounting bracket and is compressed and deformed under the action of the compression force, thereby ensuring the sealing performance at the end face. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 and Figure 2 An exploded schematic diagram and an overall appearance schematic diagram of an electronically controlled throttle valve according to an embodiment of the present invention are respectively shown.

[0016] Figure 3 and Figure 4 Schematic diagrams of longitudinal sections of the electronically controlled throttle valve according to an embodiment of the present invention when in a small cycle working state and a large cycle working state are respectively shown.

[0017] Figure 5 A schematic top view of the electronically controlled throttle valve according to an embodiment of the present invention is shown with the top cover removed.

[0018] Figure 6 A schematic diagram of a valve core body of an electronically controlled throttle valve according to an embodiment of the present invention is shown.

[0019] Figure 7 and Figure 8 The cross-sectional schematic diagrams of the electronically controlled throttle valve according to the embodiment of the present invention are shown from different positions respectively.

[0020] Fig. 9 and Fig.10 An overall schematic diagram and a local enlarged schematic diagram of a sealing structure implemented according to the present invention are respectively shown.

[0021] Fig.11 A schematic diagram showing a deviation between the central axis of the sealing ring of the electric-controlled throttle valve and the central axis of the through hole of the ball valve according to an embodiment of the present invention is shown.

[0022] Fig.12 A schematic diagram of the opening curves of the small coolant cycle and the large coolant cycle is shown. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] See also Figures 1 to 8 An electronically controlled throttle valve according to an embodiment of the present invention comprises a valve body 1 , a control transmission mechanism 2 , a motor 3 , a valve core position sensor 4 and a valve core 5 .

[0025] The valve body 1 includes a valve body 12, a large circulation joint 13 and a small circulation joint 14. The large circulation joint 13 and the small circulation joint 14 are respectively connected to the side of the valve body 12. The valve body 12 is provided with an electrical chamber 121 and a fluid chamber 122. The electrical chamber 121 is used to accommodate the control transmission mechanism 2 and the motor 3, and the fluid chamber 122 is used to transport the fluid. The electrical chamber 121 and the fluid chamber 122 are separated from each other by a partition. In this embodiment, the electrical chamber 121 is located above the fluid chamber 122 and is covered by a top cover 123.

[0026] The valve core 5 is rotatably arranged on the valve body 12. The valve core 5 includes a valve core body 51 and a valve stem 52, and the valve core body 51 is connected to the valve stem 52. The valve core body 51 has a first fluid opening 5a, a second fluid opening 5b and a fluid inlet 5c. The fluid inlet 5c is arranged at the bottom of the valve core body 51, and the valve body 12 is provided with a fluid inlet 12c at a position corresponding to the fluid inlet 5c. The first fluid opening 5a and the second fluid opening 5b are respectively arranged on the side of the valve core body 51. The first fluid opening 5a and the second fluid opening 5b are circumferentially spaced 90° apart.

[0027] In this embodiment, the valve core body 51 includes an upper valve core body part 511 and a lower valve core body part 512, the bottom end of the upper valve core body part 511 is connected to the top end of the lower valve core body part 512, the fluid inlet 5c is arranged at the bottom of the lower valve core body part 512, and the side surfaces of the upper valve core body part 511 and the lower valve core body part 512 are both spherical. The number of the first fluid opening 5a and the second fluid opening 5b are both two, one of the first fluid opening 5a and one of the second fluid openings 5b are arranged in the upper valve core body part 511, and the other first fluid opening 5a and the other second fluid opening 5b are arranged in the lower valve core body part 512. The two first fluid openings 5a are arranged in a row along the axial direction of the valve core body, and the two second fluid openings 5b are arranged in a row along the axial direction of the valve core body.

[0028] The valve core position sensor 4 and the control transmission mechanism 2 are respectively installed on the valve body 12. The valve core position sensor 4 is used to detect the position of the valve core 5 and transmit the position detection signal to the controller (such as an external driving computer). The control transmission mechanism 2 is connected to the valve core 5 and is used to drive the valve core 5 to rotate according to the control signal of the controller. In this embodiment, the control transmission mechanism is a worm gear mechanism. The motor 3 is a DC motor. The worm 24 is connected to the output end of the motor 3, and the worm wheel 23 is connected to the valve stem 52, and the valve stem 52 rotates synchronously with the worm wheel 23. Optionally, the worm wheel 23 and the valve stem 52 are connected by laser welding, and the valve stem 52 and the valve core body 51 are injection molded into a whole.

[0029] The electronically controlled throttle valve receives the signal from the on-board computer through the electrical plug 17, and controls the rotation of the DC motor 3. After the DC motor 3 rotates, it drives the worm 24 to rotate, and the worm 24 drives the worm wheel 23 meshing with the worm 24 to rotate. The on-board computer controls the valve core 5 to rotate to a specified angle according to the engine driving status and other sensor data of the engine. At the same time, the valve core position sensor 4 feeds back the current actual angle of the valve core to the on-board computer, and the on-board computer corrects the rotation of the DC motor 3 to reach the required angle. When the valve core 5 reaches the specified position, the on-board computer controls the DC motor 3 to cut off the power. Since the worm 24 and the worm wheel 23 have a self-locking function, the worm 24 cannot drive the worm wheel 23, that is, the valve core 5 can maintain the current position after the DC motor 3 is powered off.

[0030] Fig.12 The opening curve diagram of the coolant small cycle and the coolant large cycle is shown. The engine control small cycle opening curve is α, and the large cycle opening curve is β, where the large and small cycle flow can meet the complementary requirements, that is, the sum of the flow of the large and small cycles in any state is a constant value, such as the small cycle is fully open, the large cycle is fully closed, or the small cycle is 1 / 3 open, and the large cycle is 2 / 3 open.

[0031] Please refer to Figure 3 During the small cycle, cooling water enters from the fluid inlet 5c, and the valve core 5 rotates to the first specified angle (i.e., the valve core rotates to the maximum opening position of the small cycle). At this time, the two second fluid openings 5b and the small cycle joint 14 are in the maximum opening state, while the first fluid opening 5a and the large cycle joint 13 are in the fully closed state. The liquid flows along Figure 3 The arrow directions in the figure respectively converge from the second fluid openings 5b of the two-stage valve core body and then flow out from the small circulation joint 14. At this time, no liquid flows out from the large circulation joint 13.

[0032] Please refer to Figure 4During the large circulation, cooling water enters from the fluid inlet 5c, and the valve core 5 rotates to the second specified angle (i.e., the valve core rotates to the maximum opening position of the large circulation). At this time, the two first fluid openings 5a and the large circulation joint 13 are in the maximum opening state, while the second fluid opening 5b and the small circulation joint 14 are in the fully closed state. The liquid flows along Figure 4 The arrow directions in the figure respectively converge from the first fluid openings 5a of the two-stage valve core body and then flow out from the large circulation joint 13. At this time, no liquid flows out from the small circulation joint 14.

[0033] In order to ensure that no liquid flows out of the other joint during the above two cycles, it is necessary to set a fluid sealing structure between the valve core 5 and the large circulation joint 13 and the small circulation joint 14 to achieve sealing with the outside world, that is, to ensure that during the small cycle, no cooling liquid flows out of the valve core 5 and the large circulation joint 13, ensuring that it is fully closed; during the large cycle, no cooling liquid flows out of the valve core 5 and the small circulation joint 14, ensuring that it is fully closed.

[0034] In this embodiment, the same number of sealing structures 6 as the first fluid openings 5a are provided between the valve core 5 and the large circulation joint 13, and the same number of sealing structures 6 as the second fluid openings 5b are provided between the valve core 5 and the small circulation joint 14. Each sealing structure 6 includes a sealing ring 61, a mounting bracket 62, an elastic ring 63, a rigid bushing 64, a wave spring 65 and a pressure applying portion 66.

[0035] The sealing ring 61 , the mounting bracket 62 , the elastic ring 63 , the wave spring 65 and the pressure applying portion 66 are respectively arranged in the valve body 1 .

[0036] The sealing ring 61 is mounted on the mounting bracket 62, and the mounting bracket 62 is provided with a fluid through hole 62a along the axial direction. In this embodiment, the front end surface of the mounting bracket 62 is provided with a third annular groove 623, and the rear end of the sealing ring 61 is provided with a third annular protrusion 613 adapted to the third annular groove 623, and the third annular protrusion 613 is embedded in the third annular groove 623 to achieve fixed installation of the sealing ring 61.

[0037] The elastic ring 63 is arranged between the mounting bracket 62 and the wave spring 65, the front end surface of the elastic ring 63 is in sealing contact with the rear end of the mounting bracket 62, and the circumference of the elastic ring 63 is in sealing contact with the inner surface 11a of the valve body 1. In this embodiment, the outer circumference of the elastic ring 63 is provided with a first annular protrusion 631, the inner surface 11a of the valve body 1 is provided with a first annular groove 111 matched with the first annular protrusion 631, and the first annular protrusion 631 is embedded in the first annular groove 111. The front end surface of the elastic ring 63 is provided with a second annular protrusion 632, and the second annular protrusion 632 abuts against the rear end of the mounting bracket 62.

[0038] The rigid bushing 64 includes a bushing body 641 and a bottom protruding ring 642 extending radially outward from the bottom end of the bushing body 641. The outer circumference of the bushing body 641 is in sealing contact with the inner circumference of the elastic ring 63, and the front end surface of the bottom protruding ring 642 is in sealing contact with the rear end surface of the elastic ring 63. In this embodiment, the elastic ring is a rubber ring, and the rigid bushing is a metal bushing.

[0039] The wave spring 65 is in the shape of a corrugated tube, and the front end of the wave spring 65 abuts against the rear end surface of the bottom convex ring 642. In this embodiment, the wave spring 65 is made of metal, such as stainless steel. The advantage of using a rigid bushing 64 is that it supports the elastic ring 63 and prevents the elastic ring 63 from being radially deformed after being subjected to axial pressure, thereby affecting the radial sealing effect. In other embodiments, the rigid bushing 64 may not be used, and in this case, the front end of the wave spring 65 directly abuts against the rear end of the elastic ring 63.

[0040] The pressure applying portion 66 abuts against the rear end of the wave spring to apply an axial pressure to the wave spring 65. In this embodiment, the pressure applying portion is a step provided on the large circulation joint 13 or the small circulation joint 14. In this embodiment, the step is a waist-shaped step, which surrounds the waist-shaped hole as the middle water passage, and is used to evenly support the upper and lower wave springs. After the large circulation joint 13 or the small circulation joint 14 is assembled, the wave spring 65 is squeezed by the pressure applying portion 66 and compressed, generating an axial pressure F, which is transmitted to the rigid bushing 64 and the elastic ring 63, so that the second annular protrusion 632 is compressed. The front end surface of the rigid bushing 64 contacts the rear end of the mounting bracket 62, and transmits the axial pressure F to the mounting bracket 62, and the mounting bracket 62 transmits the axial pressure F to the sealing ring 61. Finally, due to the axial pressure F, the sealing ring 61 and the valve core body 51 are always kept in contact with the pre-tightening force, thereby achieving sealing. At the same time, after the first annular protrusion 631 (two circles of first annular protrusions are provided in this embodiment) of the elastic ring 63 is assembled into the inner hole of the valve body 1, the first annular protrusion 631 is squeezed to form a radial seal with the first annular groove 111 of the valve body 1, so that the coolant cannot pass between the outer peripheral surface of the elastic ring 63 and the inner surface 11a of the valve body 1. At the same time, the second annular protrusion 632 on the front end surface of the elastic ring 63 is squeezed to form an end face seal with the rear end surface 62c of the mounting bracket 62, so that the coolant cannot pass between the rear end surface 62c of the mounting bracket 62 and the front end surface of the elastic ring 63.

[0041] When the valve core 5 rotates to the maximum opening position of the large circulation (or the maximum opening position of the small circulation), the first fluid inlet 5a is surrounded by the sealing ring of the corresponding sealing structure (or the second fluid inlet 5b is surrounded by the sealing ring of the corresponding sealing structure), and the coolant can only pass through the center hole 61a of the sealing ring 61, the fluid through hole 62a of the mounting bracket 62, the center hole 64a of the rigid bushing and the center through hole 65a of the wave spring 65 from the first fluid opening 5a (or the second fluid opening 5b), and finally reach the large circulation joint 13 (or the small circulation joint 14).

[0042] Since the elastic coefficient K of the wave spring 65 is small, the force deviation caused by the assembly and the cumulative deviation of the parts is small, so that the force F acting on the sealing ring 61 is relatively stable. At the same time, since the wave spring 65 is made of stainless steel, its elastic modulus is large, and the elastic modulus changes little when it is affected by temperature fluctuations, so that the force F acting on the sealing ring 61 is relatively stable.

[0043] Please refer to Fig.11 Due to the assembly process or the accumulated deviation of the parts, there is a deviation L between the center axis X1 of the sealing ring and the center axis X2 of the first fluid opening of the valve core. Fig.11 Taking the first fluid opening 5a as an example, the deviation principle between the central axis of the second fluid opening 5b and the central axis of the sealing ring is similar to this), the deviation value L can be a positive value or a negative value.

[0044] Please refer to Fig.10 In this embodiment, the rear end face 62c of the mounting bracket 62 is provided with a second annular groove 622, and the second annular groove 622 surrounds the fluid through hole 62a. The front end face of the elastic ring 63 is provided with an annular flange 633 protruding forward, and the annular flange 633 extends into the second annular groove 622. The width of the annular flange 633 is smaller than the groove width of the second annular groove 622, so that the mounting bracket 62 can move in the radial direction relative to the elastic ring 63. The second annular protrusion 632 is provided at the top end of the annular flange, and the second annular protrusion 632 abuts against the bottom surface of the second annular groove 622.

[0045] The sealing ring 61 and the mounting bracket 62 are assembled to form a whole, and the elastic ring 63, the rigid bushing 64 and the wave spring 65 are assembled to form a whole with the large circulation joint 13. At the same time, the elastic ring 63 and the rigid bushing 64 have a bidirectional movement s with the mounting bracket 62, that is, when there is a deviation value of L, the sealing ring 61 and the mounting bracket 62 can be moved by the movement amount s relative to the elastic ring 63 and the rigid bushing 64 after a displacement less than s, so that the central axis X1 of the sealing ring and the central axis X2 of the first fluid opening are in a straight line, thereby ensuring sealing.

[0046] The working principle of the electronically controlled throttle valve of this embodiment is as follows: the on-board computer controls the rotation of the DC motor 3 according to the actual operating conditions of the engine, and the valve core position sensor 4 feeds back the current position angle of the valve core. The on-board computer corrects the rotation angle of the DC motor 3. After reaching the set position, the valve core 5 controls the opening of the large circulation joint 13 and the small circulation joint 14 to achieve precise control of the flow of the large circulation and the small circulation. The sealing structure 6 can realize the internal leakage control of the cooling water to prevent the cooling water from leaking from the inside and affecting the flow control accuracy.

[0047] The above description is a further explanation of the present invention in combination with specific implementation methods and drawings. However, the present invention can obviously be implemented in a variety of other methods different from the description, and those skilled in the art can generalize and deduce according to actual usage without violating the content of the present invention. Therefore, the content of the above specific embodiments should not limit the protection scope determined by the present invention.

Claims

1. A valve sealing structure, comprising a valve body, a valve core and a sealing ring, wherein the valve core is rotatably arranged on the valve body, characterized in that: The sealing structure further comprises a mounting bracket, an elastic ring, a wave spring and a pressure applying portion, wherein the sealing ring, the mounting bracket, the elastic ring, the wave spring and the pressure applying portion are respectively arranged in the valve body; The sealing ring is installed on the mounting bracket, and the mounting bracket is provided with a fluid through hole along the axial direction; the rear end surface of the mounting bracket is provided with a second annular groove, and the second annular groove surrounds the fluid through hole; The elastic ring is arranged between the mounting bracket and the wave spring, the front end face of the elastic ring is in sealing contact with the rear end of the mounting bracket, and the outer peripheral surface of the elastic ring is in sealing contact with the inner surface of the valve body; the front end face of the elastic ring is provided with an annular flange protruding forward, the annular flange extends into the second annular groove, and the width of the annular flange is smaller than the groove width of the second annular groove, so that the mounting bracket can move in the radial direction relative to the elastic ring; The wave spring is in the shape of a corrugated tube, and the front end of the wave spring abuts against the rear end of the elastic ring; The pressure applying portion abuts against the rear end of the wave spring to apply an axial pressure to the wave spring. The axial pressure is transmitted to the sealing ring through the elastic ring and the mounting bracket to make the sealing ring close to the surface of the valve core.

2. The valve sealing structure according to claim 1, characterized in that: A first annular protrusion is disposed on the outer circumferential surface of the elastic ring, and a first annular groove matching with the first annular protrusion is disposed on the inner surface of the valve body, and the first annular protrusion is embedded in the first annular groove.

3. The valve sealing structure according to claim 1 or 2, characterized in that: A second annular protrusion is provided on the front end surface of the elastic ring, and the second annular protrusion abuts against the rear end of the mounting bracket.

4. The valve sealing structure according to claim 1, characterized in that: A second annular protrusion is provided at the top end of the annular flange, and the second annular protrusion abuts against the bottom surface of the second annular groove.

5. The valve sealing structure according to claim 1, characterized in that: The sealing structure includes a rigid liner, which includes a liner body and a bottom convex ring extending radially outward from the bottom end of the liner body; the outer circumferential surface of the liner body is in sealing contact with the inner circumferential surface of the elastic ring, the front end face of the bottom convex ring is in sealing contact with the rear end face of the elastic ring, and the front end of the wave spring abuts against the rear end face of the bottom convex ring.

6. The valve sealing structure according to claim 5, characterized in that: The elastic ring is a rubber ring, and the rigid lining ring is a metal lining ring.

7. The valve sealing structure according to claim 1, characterized in that: A third annular groove is provided on the front end surface of the mounting bracket, and a third annular protrusion matched with the third annular groove is provided on the rear end of the sealing ring, and the third annular protrusion is embedded in the third annular groove.

8. The valve sealing structure according to claim 1, characterized in that: The surface where the valve core contacts the sealing ring is a spherical surface.

9. The valve sealing structure according to claim 1, characterized in that: The material of the wave spring is metal.

10. The valve sealing structure according to claim 1, characterized in that: The pressure applying portion is a step.

11. An electronically controlled throttle valve, characterized in that: The electrically controlled throttle valve comprises a sealing structure of a valve according to any one of claims 1 to 10.

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