A bilateral plugging rotary high-precision flow regulating valve

Abstract

The present invention relates to a bilateral plugging rotary high-precision flow regulating valve, which includes a housing, a bushing, a valve core, a sealing ring, a bearing, a sealing block, etc. The present invention drives the valve core to rotate through an external power device, adjusts the flow area passing through the adjustment window, and thus achieves the purpose of flow regulation; the sealing structures on both sides of the adjustment window adopt rubber rings and anti-friction sealing rings to block multiple leakage channels and achieve micro-leakage; the valve core is supported and guided by bearings and sealing blocks at both ends, which reduces the friction force of the moving surface while ensuring the centering accuracy, and can achieve long-life and high-precision regulation; the valve core adopts a rectangular window design, which ensures the linear relationship between the flow rate and the angle, and the flow control is simple. The present invention has the advantages of micro-leakage, long life, linearly adjustable flow rate, and high-precision regulation.

Description

Technical Field

[0001] The present application relates to the technical field of regulating valves, and particularly to a bilateral-sealing rotary high-precision flow regulating valve. Background Art

[0002] In a variable-thrust engine control system, it is often necessary to set a regulating valve in the high-pressure pipeline behind the pump, mainly for engine thrust regulation. General flow regulating valves include rotary regulating valves and linear motion regulating valves. For linear flow regulation, the valve core profile of a rotary regulating valve is simple and easy to implement. According to a certain research and development requirement, a bilateral-sealing rotary high-precision flow regulating valve is designed, mainly for linear regulation of engine thrust. Existing rotary flow regulating valves cannot be completely closed, there are multiple leakage channels, and the leakage amount is not fixed during the regulation process, resulting in uncontrolled regulation accuracy and difficulty in meeting the requirements of high-precision flow regulation, especially with poor regulation accuracy at small flow rates. Summary of the Invention

[0003] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, aiming at problems such as large leakage and uncontrolled regulation accuracy of general rotary regulating valves, providing a bilateral-sealing rotary flow regulating valve, which realizes high-precision flow regulation by blocking leakage channels and positioning and centering at both ends.

[0004] The technical solution of the present invention is:

[0005] A bilateral-sealing rotary high-precision flow regulating valve, comprising:

[0006] A housing, provided with a vertical flow channel serving as a fluid inlet, a horizontal flow channel serving as a fluid outlet, and a housing cavity communicating the vertical flow channel and the horizontal flow channel;

[0007] A bushing, located in the housing cavity, with a bushing ring cavity facing the vertical flow channel on the outside, provided with a flow-through window, and the flow-through window penetrates from the bushing ring cavity to the bushing inner cavity;

[0008] A valve core, coaxially rotatably connected to the bushing, provided with an adjustment window, and the adjustment window penetrates from the outside of the valve core to the valve core inner cavity. The valve core inner cavity communicates with the horizontal flow channel. Axially on the valve core, the adjustment window is opposite to the flow-through window. One end of the valve core away from the horizontal flow channel is connected to a valve rod for connecting a driving device;

[0009] A first sealing mechanism and a second sealing mechanism, located between the bushing and the valve core, and respectively on both sides of the bushing ring cavity.

[0010] The first sealing mechanism includes a first sealing ring and a boss for limiting the first sealing ring, the first sealing ring is located on the side of the sleeve ring cavity facing the horizontal flow channel, the boss is arranged on the outer wall of the valve core, and the inner side of the sleeve is provided with an inner limiting surface perpendicular to the axis of the sleeve, the inner limiting surface is located on the side of the boss away from the horizontal flow channel, and the first sealing ring is located between the boss and the inner limiting surface.

[0011] An inner cavity bottom surface is arranged inside the bushing, a right end limit surface is arranged outside the valve core, the right end limit surface is located on the side of the inner cavity bottom surface facing the horizontal flow channel, a sealing block is arranged between the bushing and the valve core, and the sealing block is located between the inner cavity bottom surface and the right end limit surface.

[0012] The second sealing mechanism includes a second sealing ring and an end cover for limiting the second sealing ring. The second sealing ring is located on the side of the sleeve ring cavity away from the horizontal flow channel and on the side of the inner cavity bottom surface away from the horizontal flow channel. The end cover is connected to the sleeve and is located on the side of the second sealing ring away from the horizontal flow channel.

[0013] The first sealing ring and the second sealing ring are self-tightening sealing rings with built-in elastic elements;

[0014] The first sealing ring and the second sealing ring are made of plastic.

[0015] The valve stem is provided with a plurality of discharge holes evenly distributed in the circumferential direction, the discharge holes are located between the sealing ring and the second sealing ring, and the discharge holes are communicated with the inner cavity of the valve core through the long hole of the valve core.

[0016] The outer wall of the left end of the valve core is a left end annular surface, and a left end annular cavity for placing a bearing is provided at the end of the shell inner cavity close to the horizontal flow channel. In the axial direction of the valve core, the bearing is located between the left end annular surface and the left end annular cavity.

[0017] The valve core is provided with a plurality of balancing holes evenly distributed in the circumferential direction, and in the axial direction of the valve core, the balancing holes are located between the boss and the bearing.

[0018] On the cross section passing through the axis of the valve core, the projection of the regulating window is a rectangle, and the edge of the regulating window is along the radial direction of the valve core.

[0019] The outer wall of the bushing is provided with a bushing ring groove, the inner wall of the shell is provided with a shell ring groove, in the axial direction of the bushing, the bushing ring groove and the shell ring groove are located on both sides of the bushing ring cavity, and retaining rings and rubber rings are provided in the bushing ring groove and the shell ring groove.

[0020] In summary, this application at least includes the following beneficial technical effects:

[0021] 1) The first and second plastic sealing rings are used for the rotating dynamic seals between the valve core and the bushing to block the leakage channels at both ends of the regulating window along the axial direction, reduce the leakage when the valve core is fully closed, and help reduce the friction of the moving surface of the valve core.

[0022] 2) The spool is supported and guided at both ends by bearings and sealing blocks, ensuring the centering accuracy between the spool and the bushing, minimizing and controlling the leakage when the spool is fully closed, reducing the friction of the moving surface while improving the adjustment accuracy.

[0023] 3) The adjustment window and the flow-through window adopt a rectangular structure and the throttling orifice maintains a sharp-edge design, without throttling at other positions of the flow channel, achieving high-precision linear flow regulation.

[0024] 4) The flow-through window is located at the lower end of the vertical channel of the housing. After the medium flow channel is rectified and buffered by the bushing ring cavity, it enters the overlapping part of the adjustment window and the flow-through window, which helps to stabilize the flow field and improve the adjustment accuracy.

[0025] 5) A discharge hole connecting the outlet is arranged between the right end of the spool and the second sealing ring of the plastic between the sealing blocks, ensuring that the fluid between the sealing blocks and the second sealing ring can enter the inner cavity of the spool through the discharge hole. Then, the residual liquid between the sealing blocks and the second sealing ring after the liquid flow test can leak out through the discharge hole, without being blocked by pressure and is easy to dry. Description of the Drawings

[0026] Figure 1 is a schematic diagram of the internal structure of the flow regulating valve in the embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of the throttling window structure in the embodiment of the present invention;

[0028] Figure 3 In (a) is a schematic diagram of the bushing structure in the embodiment of the present invention, and (b) is a cross-sectional view of the bushing at the position of the flow-through window;

[0029] Figure 4 In (a) is a schematic diagram of the spool structure in the embodiment of the present invention, and (b) is a cross-sectional view of the spool at the position of the adjustment window.

[0030] Description of the reference numerals: 1. Housing; 111. Vertical flow channel; 112. Horizontal flow channel; 113. Inner cavity of the housing; 114. Right end face of the housing; 115. Housing ring groove; 116. Left end ring cavity; 2. Bushing; 211. Bushing ring cavity; 212. Flow-through window; 213. Right end plane of the bushing; 214. Bushing ring groove; 215. Inner cavity of the bushing; 216. Inner ring surface of the bushing; 217. Bottom surface of the inner cavity; 218. Inner limiting surface; 3. Spool; 311. Inner cavity of the spool; 312. Outer cylindrical surface of the spool; 313. Right end limiting surface; 314. Adjustment window; 315. Boss; 316. Valve stem; 317. Left end ring surface; 318. Balance hole; 319. Discharge hole; 310. Long hole of the spool; 4. First sealing ring; 5. Sealing block; 6. Second sealing ring; 7 / 9. Retaining ring; 8 / 10. Rubber ring; 11. Bearing; 12. End cover; 13. Sharp edge; 14. Driving device. Detailed implementation mode

[0031] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0032] An embodiment of the present application discloses a bilateral plugging rotary high-precision flow regulating valve, as Figure 1 and Figure 2 shown, which includes a housing 1, a bushing 2, and a valve core 3. The housing 1 is provided with a vertical flow channel 111 serving as a fluid inlet, a horizontal flow channel 112 serving as a fluid outlet, and a housing inner cavity 113 connecting the vertical flow channel 111 and the horizontal flow channel 112; the bushing 2 is located in the housing inner cavity 113, and a bushing ring cavity 211 facing the vertical flow channel 111 is provided on the outside. On the side of the bushing 2 away from the vertical flow channel 111, there is a flow-through window 212, and the flow-through window 212 penetrates from the bushing ring cavity 211 to the bushing inner cavity 215; the valve core 3 is coaxially rotatably connected to the bushing 2, and is provided with an adjustment window 314 penetrating from the outside of the valve core 3 to the valve core inner cavity 311. The valve core inner cavity 311 is communicated with the horizontal flow channel 112. Axially on the valve core 3, the adjustment window 314 and the flow-through window 212 are opposite to each other. One end of the valve core 3 away from the horizontal flow channel 112 is connected to a valve stem 316 same as that connected to the driving device 14. Between the bushing 2 and the valve core 3, a first sealing mechanism and a second sealing mechanism are respectively provided on both sides of the bushing ring cavity 211. The first sealing mechanism and the second sealing mechanism form a rotary dynamic seal between the bushing 2 and the valve core 3 to prevent the medium from leaking from the fitting gap between the bushing 2 and the valve core 3.

[0033] The driving device drives the valve stem 316 and the valve core 3 to rotate, so that the adjustment window 314 and the flow-through window 212 have different overlapping areas, and the flow-through window 212 and the adjustment window 314 are combined to adjust the medium flow-through area, thereby achieving the purpose of flow regulation. The fluid enters the housing 1 from the vertical flow channel 111, then rotates to the flow-through window 212 through the side of the bushing ring cavity 211, enters the valve core inner cavity 311 through the flow-through window 212 and the adjustment window 314, and finally flows out from the horizontal flow channel 112.

[0034] As Figure 3 and Figure 4 shown, the housing inner cavity 113 is used to place the bushing 2, and the right end face 114 of the housing is used for the axial limit of the bushing 2; the housing inner cavity 113 is provided with a housing ring groove 115, and the outer wall of the bushing 2 is provided with a bushing ring groove 214. Axially on the bushing 2, the bushing ring groove 214 and the housing ring groove 115 are located on both sides of the bushing ring cavity 211. The housing ring groove 115 and the bushing ring groove 214 are used to place rubber rings 8 / 10 and retaining rings 7 / 9.

[0035] The bushing 2 is installed in the housing inner cavity 113 from the end of the housing 1 away from the horizontal flow channel 112. The bushing inner annular surface 216 forms a matching surface with the housing inner cavity 113 annular surface. The bushing right end plane 213 contacts and limits the position with the housing right end surface 114. The outer circumferential surface of the bushing 2 is provided with an annular groove for placing the rubber ring and the retaining ring. The bushing inner cavity 215 is stepped and used to place the valve core 3 and the sealing ring. The bushing inner annular surface 216 forms a rotational motion matching surface with the valve core outer circumferential surface 312. The valve core 3 enters the valve core inner cavity 311 from the end of the bushing 2 close to the horizontal flow channel 112.

[0036] like Figure 3 and Figure 4 As shown, the first sealing mechanism includes a first sealing ring 4 and a boss 315. An annular boss 315 is arranged on the outer cylindrical surface 312 of the valve core, which is used for axial limiting of the first sealing ring 4. An inner limiting surface 218 perpendicular to the axis of the bushing 2 is arranged on the inner side of the bushing 2. The inner limiting surface 218 is located on the side of the boss 315 away from the horizontal flow channel 112, and the first sealing ring 4 is located between the boss 315 and the inner limiting surface 218.

[0037] An inner cavity bottom surface 217 is provided in the bushing 2, and a right end limit surface 313 is provided on the outer side of the valve core 3. The right end limit surface 313 is located on the side of the inner cavity bottom surface 217 facing the horizontal flow channel 112. A sealing block 5 is provided between the bushing 2 and the valve core 3. The sealing block 5 is located between the inner cavity bottom surface 217 and the right end limit surface 313. The right end limit surface 313 presses the left end of the sealing block 5, and the right end surface of the sealing block 5 presses the inner cavity bottom surface 217. The inner cavity bottom surface 217 and the right end limit surface 313 limit the limit block axially. Under the pressure of the inner cavity medium, an end face seal is formed between the sealing block 5, the bushing 2, and the housing 1.

[0038] like Figure 3 (a) and Figure 4 As shown in (a), the second sealing mechanism includes a second sealing ring 6 and an end cover (12) for limiting the second sealing ring 6. The second sealing ring 6 is located on the side of the sleeve ring cavity 211 away from the horizontal flow channel 112, and is located on the side of the inner cavity bottom surface 217 away from the horizontal flow channel 112. The end cover (12) is connected to the sleeve 2, and the end cover (12) is located on the side of the second sealing ring 6 away from the horizontal flow channel 112.

[0039] The outer wall of the left end of the valve core 3 is a left end annular surface 317, and the end of the housing inner cavity 113 close to the horizontal flow channel 112 is provided with a left end annular cavity 116 for placing the bearing 11. In the axial direction of the valve core 3, the bearing 11 is located between the left end annular surface 317 and the left end annular cavity 116. By extending one end of the valve core 3 close to the horizontal flow channel 112 and arranging the bearing 11 between the valve core 3 and the housing 1, the coaxiality between the housing 1 and the valve core 3 is ensured, and the sealing between the valve core 3 and the bushing 2 during the rotation process is improved.

[0040] The valve core 3 is provided with four evenly distributed circumferentially balanced holes 318. Axially on the valve core 3, the balanced holes 318 are located between the boss 315 and the bearing 11. The balanced holes 318 are used to quickly balance the medium pressures at both ends of the bearing 11, ensure that the bearing 11 is not affected by the axial medium force, and improve the service life.

[0041] Four discharge holes 319 are provided on the right end valve stem 316 of the valve core 3 and are evenly distributed circumferentially. The discharge holes 319 communicate with the inner cavity 311 of the valve core through the long holes 310 of the valve core. Axially on the valve core 3, the discharge holes 319 are located between the sealing ring and the second sealing ring 6. The liquid between the sealing block 5 and the second sealing ring 6 can flow into the inner cavity 311 of the valve core through the discharge holes 319 and the long holes 310 of the valve core.

[0042] The materials of the first sealing ring 4 and the second sealing ring 6 are plastics. The selection of this material can play a good sealing role and at the same time make the friction between the bushing 2 and the valve core 3 smaller. The first sealing ring 4 and the second sealing ring 6 are self-tightening sealing rings with built-in elastic elements, and the side with the larger width faces the direction of the bushing ring cavity 211.

[0043] Such as Figure 2 、 Figure 3 (b), Figure 4 (b) shows that the flow-through window 212 and the adjustment window 314 adopt a rectangular structure and the throttle orifice maintains a sharp edge 13 design, that is, on the cross-section passing through the axis of the valve core 3, the projections of the flow-through window 212 and the adjustment window 314 are both rectangles. The edge of the adjustment window 314 is along the radial direction of the valve core 3, and the edge of the flow-through window 212 is along the radial direction of the bushing 2. The rest of the radial positions are sealed by sealing rings and rubber rings to ensure no throttling, realizing high-precision linear flow regulation; after the medium flow channel passes through the rectification and buffering of the bushing ring cavity 211, it enters the adjustment window 314, which helps to stabilize the flow field and improve the adjustment accuracy.

[0044] The sealing structures on both sides of the adjustment window 314 adopt rubber rings and anti-friction sealing rings to block various leakage channels and achieve micro-leakage; the valve core 3 is supported and guided by the bearing 11 and the sealing block 5 at both ends, which ensures the centering accuracy and reduces the friction of the moving surface at the same time, and can achieve long-life and high-precision adjustment; the valve core 3 adopts a rectangular window design, which ensures the linear relationship between the flow rate and the angle, and the flow rate control is simple.

[0045] The implementation principle of this application is as follows: The driving device drives the valve stem 316 and the valve core 3 to rotate, so that the adjustment window 314 and the flow-through window 212 have different overlapping areas. The fluid enters the housing 1 from the vertical flow channel 111, then rotates to the flow-through window 212 through the side of the bushing ring cavity 211, enters the inner cavity 311 of the valve core through the flow-through window 212 and the adjustment window 314, and finally flows out from the horizontal flow channel 112. During this process, the setting of the first sealing structure and the sealing structure ensures stable sealing between the bushing 2 and the valve core 3 during the rotation of the valve core 3, and the fluid will not leak from both ends of the gap between the bushing 2 and the valve core 3. Even if the fluid enters between the bushing 2 and the valve core 3 from the gap between the flow-through window 212 and the adjustment window 314, then finally the fluid can flow back to the inner cavity 311 of the valve core through the discharge hole 319 and the long hole 310 of the valve core.

[0046] Those skilled in the art can make various additions, improvements and replacements according to different design requirements and design parameters without departing from the structure defined by the claims. Therefore, the present invention is extensive.

[0047] Although the present invention is disclosed above in preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims of the present invention.

Claims

1. A bilateral plugging rotary high-precision flow regulating valve, characterized in that: include A shell (1) is provided with a vertical flow channel (111) as a fluid inlet, a horizontal flow channel (112) as a fluid outlet, and a shell inner cavity (113) connecting the vertical flow channel (111) and the horizontal flow channel (112); The bushing (2) is located in the inner cavity (113) of the housing, and is provided with a bushing annular cavity (211) facing the vertical flow channel (111) on the outside, and is provided with a flow window (212), and the flow window (212) runs through the bushing annular cavity (211) to the bushing inner cavity (215); The valve core (3) is coaxially rotatably connected to the bushing (2), and is provided with an adjustment window (314). The adjustment window (314) extends from the outside of the valve core (3) to the valve core inner cavity (311). The valve core inner cavity (311) is communicated with the horizontal flow channel (112). In the axial direction of the valve core (3), the adjustment window (314) and the flow window (212) are opposite. The end of the valve core (3) away from the horizontal flow channel (112) is connected to a valve stem (316). The valve stem (316) is used to connect to a driving device. The first sealing mechanism and the second sealing mechanism are located between the bushing (2) and the valve core (3), and are respectively located on two sides of the bushing annular cavity (211); The first sealing mechanism comprises a first sealing ring (4) and a boss (315) for limiting the first sealing ring (4); the first sealing ring (4) is located on the side of the bushing ring cavity (211) facing the horizontal flow channel (112); the boss (315) is arranged on the outer wall of the valve core (3); an inner limiting surface (218) perpendicular to the axis of the bushing (2) is arranged on the inner side of the bushing (2); the inner limiting surface (218) is located on the side of the boss (315) away from the horizontal flow channel (112); and the first sealing ring (4) is located between the boss (315) and the inner limiting surface (218); An inner cavity bottom surface (217) is provided in the bushing (2), a right end limit surface (313) is provided on the outer side of the valve core (3), the right end limit surface (313) is located on the side of the inner cavity bottom surface (217) facing the horizontal flow channel (112), a sealing block (5) is provided between the bushing (2) and the valve core (3), and the sealing block (5) is located between the inner cavity bottom surface (217) and the right end limit surface (313); The second sealing mechanism comprises a second sealing ring (6) and an end cover (12) for limiting the position of the second sealing ring (6); the second sealing ring (6) is located on a side of the bushing annular cavity (211) away from the horizontal flow channel (112), and is located on a side of the inner cavity bottom surface (217) away from the horizontal flow channel (112); the end cover (12) is connected to the bushing (2), and the end cover (12) is located on a side of the second sealing ring (6) away from the horizontal flow channel (112).

2. The bilateral plugging rotary high-precision flow regulating valve according to claim 1, characterized in that: The first sealing ring (4) and the second sealing ring (6) are self-tightening sealing rings with built-in elastic elements; The surface material of the first sealing ring (4) and the second sealing ring (6) is plastic.

3. A bilateral plugging rotary high-precision flow regulating valve according to claim 1, characterized in that: The valve stem (316) is provided with a plurality of discharge holes (319) uniformly distributed in the circumferential direction. The discharge holes (319) are located between the sealing ring and the second sealing ring (6). The discharge holes (319) are connected to the valve core inner cavity (311) through the valve core long hole (310).

4. A bilateral plugging rotary high-precision flow regulating valve according to claim 1, characterized in that: The outer wall at the left end of the spool (3) is a left end annular surface (317). An end of the inner cavity (113) of the housing close to the horizontal flow channel (112) is provided with a left end annular cavity (116) for placing the bearing (11). Axially on the spool (3), the bearing (11) is located between the left end annular surface (317) and the left end annular cavity (116).

5. The bilateral plugging rotary high-precision flow regulating valve according to claim 4, characterized in that: A plurality of balance holes (318) evenly distributed in the circumferential direction are provided on the spool (3). Axially on the spool (3), the balance holes (318) are located between the boss (315) and the bearing (11) and communicate with the inner cavity (311) of the spool.

6. The bilateral plugging rotary high-precision flow regulating valve according to claim 1, wherein: In the cross-section passing through the axis of the spool (3), the projection of the adjustment window (314) is rectangular, and the edge of the adjustment window (314) is along the radial direction of the spool (3).

7. A bilateral plugging rotary high-precision flow regulating valve according to claim 1, characterized in that: A bushing ring groove (214) is provided on the outer wall of the bushing (2), and a housing ring groove (115) is provided on the inner wall of the housing (1). Axially on the bushing (2), the bushing ring groove (214) and the housing ring groove (115) are located on both sides of the bushing annular cavity (211). Retaining rings and rubber rings are provided in both the bushing ring groove (214) and the housing ring groove (115).

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