Electric control pressure reducing and stabilizing valve

Abstract

The utility model discloses an electric control pressure reducing and stabilizing valve, which comprises a valve body, a valve cover, a valve core and a valve core driving device, a pressure stabilizing device is arranged in an air outlet cavity of the valve body, the pressure stabilizing device comprises a pressure stabilizing sheet, a pressure stabilizing cavity is separated by the pressure stabilizing sheet, and the pressure stabilizing sheet is provided with a pressure stabilizing hole; the valve element comprises a valve rod and a double-valve-plate component, the valve rod is sleeved with the double-valve-plate component, the double-valve-plate component and the valve rod are meshed through a thread pair or a lead screw pair, the valve rod is restrained by an axial limiting piece to only rotate, and the double-valve-plate component is restrained by a radial limiting piece to only move in the axial direction. Due to the fact that both the thread pair and the lead screw pair have a self-locking function, pressure fluctuation of a circulating medium and axial force generated on the double valve plates cannot cause movement of the valve rod, namely, axial movement of the double valve plates cannot be caused, the circulating area is not changed, the flow of the circulating medium can be stably controlled, and a good pressure stabilizing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric control valves, in particular to an electric control pressure reducing and stabilizing valve. Background Art

[0002] The Chinese invention patent with patent number ZL201410488956.0 discloses a motor-driven EGR valve, which is essentially a motor-driven flow control valve. The valve can well control the stable flow of the medium, but when the pressure fluctuation of the flowing medium is large, since the double valve plate is composed of two plates with unequal diameters, the resultant force of the medium is not zero. The force is transmitted to the cam through the valve stem. Since the cam structure does not have a self-locking function, it causes axial fluctuations of the double valve plate, causing the flow of the circulating medium to fluctuate, and ultimately causing control errors. Summary of the invention

[0003] In view of this, the technical problem to be solved by the utility model is to provide an electrically controlled pressure reducing and stabilizing valve, which can not only stably control the flow rate of the circulating medium, but also reduce pressure fluctuations and achieve a good pressure stabilizing effect.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] An electrically controlled pressure reducing and stabilizing valve, the electrically controlled pressure reducing and stabilizing valve comprising: a valve body, a valve cover, a valve core and a valve core driving device, the valve cover is fixedly connected to the valve body, the valve core is rotatably installed between the valve body and the valve cover; the valve body is provided with an air inlet cavity and an air outlet cavity, the air outlet cavity is provided with a pressure sensor for detecting the pressure of the air outlet cavity and transmitting the detection signal to an electronic control unit; the air outlet cavity is also provided with a pressure stabilizing device, the pressure stabilizing device comprises a pressure stabilizing sheet, the pressure stabilizing sheet separates the pressure stabilizing cavity, the pressure stabilizing sheet is provided with a pressure stabilizing hole; the valve core comprises a valve stem and a double valve sheet component, the double valve sheet component is sleeved on the valve stem, and And the two are meshed with each other through a thread pair or a screw pair, the valve stem is constrained by an axial limiter to only make rotational motion, and the double valve plate component is constrained by a radial limiter to only move axially; one end of the valve stem is recorded as a driving end, and a magnet is provided at the driving end, and an angle sensor is provided at a position corresponding to the magnet, and the angle sensor is electrically connected to the electronic control unit; the valve core driving device includes a motor and a gear mechanism, the motor is controlled by the electronic control unit, and the gear mechanism includes a meshing driving gear and a driven gear, the driving gear is arranged on the motor output shaft, and the driven gear is arranged at the driving end of the valve stem.

[0006] Wherein, the air inlet cavity is provided with the pressure stabilizing device.

[0007] Among them, the voltage stabilizing sheet includes a voltage stabilizing sheet 1 and a voltage stabilizing sheet 2 which are arranged at intervals, the voltage stabilizing holes of the voltage stabilizing sheet 1 include a plurality of peripheral holes arranged near the periphery, and the voltage stabilizing holes of the voltage stabilizing sheet 2 include a central hole near its center, and the aperture of the central hole is larger than the aperture of the peripheral holes.

[0008] Wherein, the inner circumferential surface of the double valve disc component is provided with an axially extending chip removal groove, and the chip removal groove disconnects the internal thread of the double valve disc component.

[0009] Wherein, a limiting groove is arranged on the outer peripheral surface of the double valve disc component, and the radial limiting member is a limiting pin shaft arranged on the valve body, and one end of the limiting pin shaft is constrained in the limiting groove.

[0010] Wherein, the axial limiting member comprises a thrust pad fixedly arranged at the bottom of the valve cover, and the thrust pad is provided with an open slot; the valve stem is provided with an axial limiting slot, and the axial limiting slot is constrained in the open slot.

[0011] Among them, the inner cavity of the valve body is provided with a valve plate seat, and the valve plate seat is provided with a seat sealing surface 1 and a seat sealing surface 2 with different diameters. The valve plate of the double valve plate component is provided with a valve plate sealing surface 1 and a valve plate sealing surface 2 with different diameters. The valve plate sealing surface 1 and the seat sealing surface 1 as well as the valve plate sealing surface 2 and the seat sealing surface 2 respectively cooperate to form a sealing surface.

[0012] After adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0013] In the electric-controlled pressure-reducing and stabilizing valve of the utility model, the double valve plate component of the valve core is sleeved on the valve stem, and the two are meshed with each other through a threaded pair or a lead screw pair. Since the threaded pair / the lead screw pair both have a self-locking function, the axial force generated on the double valve plates by the pressure fluctuation of the circulating medium will not cause the movement of the valve stem, that is, will not cause the axial movement of the double valve plates. Therefore, the flow area does not change, thereby being able to stably control the flow rate of the circulating medium.

[0014] Since the outlet cavity (after the valve) of the valve body is provided with a pressure stabilizing device, the pressure stabilizing device includes a pressure stabilizing sheet provided with a pressure stabilizing hole, the pressure stabilizing sheet separates the pressure stabilizing cavity, the medium with pressure fluctuation enters the pressure stabilizing cavity, and then passes through the pressure stabilizing hole with a reduced flow area, the pressure fluctuation is reduced to achieve a pressure stabilizing effect. When a pressure stabilizing device is further provided in the inlet cavity (before the valve) of the valve body, the pressure fluctuation from the original medium can be greatly reduced, and the pressure stabilizing effect is better when combined with the pressure stabilizing device after the valve.

[0015] Since an axially extending chip groove is provided on the inner circumferential surface of the double valve disc component, the chip groove disconnects the internal thread of the double valve disc component, and impurities in the medium and debris from thread grinding can be discharged through the chip groove, avoiding jamming of the thread fit and ensuring normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an electrically controlled pressure reducing and stabilizing valve according to the first embodiment of the utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of the valve stem assembly structure;

[0018] Figure 3 yes Figure 1 Schematic diagram of thrust pad structure in FIG.

[0019] Figure 4 yes Figure 1 A schematic cross-sectional view of the double valve plate component;

[0020] Figure 5 yes Figure 4 Schematic diagram of top view;

[0021] Figure 6 yes Figure 1 A schematic diagram of the three-dimensional structure of the double valve plate component;

[0022] Figure 7 yes Figure 1 A schematic diagram of the structure of the voltage stabilizer;

[0023] Figure 8 yes Figure 1 Schematic diagram of the structure of the voltage stabilizer 2;

[0024] Fig. 9 This is a schematic diagram of the structure of an electrically controlled pressure reducing and stabilizing valve according to the second embodiment of the utility model;

[0025] In the figure:

[0026] 1. Valve body; 11. Valve seat; 12. Valve cover;

[0027] 2. Valve core; 20. Valve stem assembly; 21. Valve stem; 211. External thread; 212. Axial limit groove; 22. Double valve disc component; 221. Internal thread; 222. Chip removal groove; 223. Limit groove; 224. Valve disc sealing surface 1; 225. Valve disc sealing surface 2;

[0028] 3. Valve core driving device; 31. Motor; 32. Driving gear; 33. Driven gear;

[0029] 41, voltage stabilizing plate 1; 411, peripheral hole; 42, voltage stabilizing plate 2; 421, center hole;

[0030] 5. Electronic control unit;

[0031] 6. Pressure sensor;

[0032] 7. Angle sensor;

[0033] 8. Magnet;

[0034] 9. thrust pad; 91. opening slot;

[0035] 10. Limit pin;

[0036] A, air inlet chamber; B, air outlet chamber; C1, pressure stabilizing chamber 1; C2, pressure stabilizing chamber 2. DETAILED DESCRIPTION

[0037] It should be noted that in the description of this article, unless otherwise specified or limited, the terms "connected", "connected", "connected", etc. should be understood in a broad sense, and can be a direct connection between two elements or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0038] The following is a non-limiting description of the embodiments of the present invention in further detail with reference to the accompanying drawings.

[0039] Embodiment 1

[0040] like Figure 1 As shown, an electrically controlled pressure reducing and stabilizing valve comprises a valve body 1, a valve cover 12, a valve core 2 and a valve core driving device 3, wherein the valve cover 12 is fixedly connected to the valve body 1, and the valve core 2 is rotatably installed between the valve body 1 and the valve cover 12. The valve body 1 is provided with an air inlet cavity A and an air outlet cavity B, and the air outlet cavity B is provided with a pressure sensor 6 for detecting the pressure of the air outlet cavity B and transmitting the detection signal to the electronic control unit 5.

[0041] like Figure 1 As shown, the valve core 2 includes a valve stem 21 and a double valve disc component 22. The double valve disc component 22 is sleeved on the valve stem 21, and the two are meshed by a threaded pair or a screw pair. The valve stem 21 is constrained by an axial limit member to only make rotational motion, and the double valve disc component 22 is constrained by a radial limit member to only move axially.

[0042] like Figure 1 and Figure 4 As shown, the inner cavity of the valve body 1 is provided with a valve plate seat 11, and the valve plate seat 11 is provided with a seat sealing surface 1 and a seat sealing surface 2 of different diameters. The valve plate of the double valve plate component 22 is provided with a valve plate sealing surface 1 224 and a valve plate sealing surface 2 225 of different diameters. The valve plate sealing surface 1 224 and the seat sealing surface 1 as well as the valve plate sealing surface 2 225 and the seat sealing surface 2 respectively cooperate to form sealing surfaces.

[0043] Since the thread pair / screw pair both have a self-locking function, the axial force generated on the double valve plate by the pressure fluctuation of the circulating medium will not cause the movement of the valve stem 21, that is, it will not cause the axial movement of the double valve plate, and the flow area will not change. In this way, even if the diameters of the two valve plates of the double valve plate are unequal and the resultant force of the medium is not zero, the flow rate of the circulating medium can be stably controlled.

[0044] like Figure 1 and Figure 6 As shown together, the double valve disc component 22 is constrained by the radial limiter and can only move in the axial direction. In this example, a limit groove 223 is provided on the outer circumference of the double valve disc component 22, and the limit groove 223 extends in parallel to the axial direction. The radial limiter is a limit pin 10 provided on the valve body 1, and one end of the limit pin 10 is constrained in the limit groove 223.

[0045] Figure 1 , Figure 2 and Figure 3 As shown, the valve stem 21 is constrained by the axial limiter to only perform rotational motion. In this embodiment, the axial limiter includes a thrust pad 9 fixedly arranged at the bottom of the valve cover 12. The thrust pad 9 is provided with an open slot 91, and the open slot 91 is designed as a U-shaped slot. The valve stem 21 is provided with an axial limiter groove 212, which is constrained in the open slot 91.

[0046] Figure 2 The overall structure of the valve stem assembly 20 is shown, with one end of the valve stem 21 being marked as the driving end. Figure 1 The driving end is provided with a magnet 8, and an angle sensor 7 is provided at a position corresponding to the magnet 8, and the angle sensor 7 is electrically connected to the electronic control unit 5. The valve core driving device 3 includes a motor 31 and a gear mechanism, the motor 31 is controlled by the electronic control unit 5, and the gear mechanism includes a meshing driving gear 32 and a driven gear 33, the driving gear 32 is provided on the output shaft of the motor 31, and the driven gear 33 is provided on the driving end of the valve stem 21. Figure 2 Also shown is the external thread 211 on the valve stem 21, which is threadedly connected to the internal thread 221 of the double valve disc component 22. The electronic control unit 5 determines the opening size of the sealing surface according to the medium pressure of the air outlet cavity B, and controls the motor 31 to rotate, driving the valve stem 21 to rotate through the gear mechanism, and the angle sensor 7 feeds back the rotation angle of the valve stem 21 to the electronic control unit 5, and the opening size of the sealing surface can be obtained through calibration.

[0047] like Figure 1 , Figure 7 and Figure 8As shown in common, the air outlet cavity B is also provided with a pressure stabilizing device, and the pressure stabilizing device includes a pressure stabilizing sheet, and the pressure stabilizing sheet separates a pressure stabilizing cavity, and the pressure stabilizing sheet is provided with a pressure stabilizing hole. The specific structure is: the pressure stabilizing sheet includes a pressure stabilizing sheet 1 41 and a pressure stabilizing sheet 2 42 arranged at intervals, the pressure stabilizing hole of the pressure stabilizing sheet 1 41 includes a plurality of peripheral holes 411 arranged near the periphery, and the pressure stabilizing hole of the pressure stabilizing sheet 2 42 includes a central hole 421 near its center, and the aperture of the central hole 421 is larger than the aperture of the peripheral hole 411, and the upstream side of the pressure stabilizing sheet 1 41 is the pressure stabilizing cavity 1 C1, and the pressure stabilizing cavity 2 C2 is between the pressure stabilizing sheet 1 41 and the pressure stabilizing sheet 2 42. The medium with pressure fluctuations enters the pressure stabilizing cavity, and then passes through the pressure stabilizing hole with a reduced flow area, reducing the pressure fluctuation and achieving a pressure stabilizing effect.

[0048] like Figure 4 and Figure 5 As shown, the double valve disc component 22 is provided with an internal thread 221, and the inner circumference of the double valve disc component 22 is provided with an axially extending chip groove 222, which disconnects the internal thread of the double valve disc component 22. The figure shows three chip grooves 222, which can also be one, two or more evenly distributed. Impurities in the medium and debris from thread grinding can be discharged through the chip groove 222 to avoid the jamming of the thread matching and ensure normal operation.

[0049] Embodiment 2

[0050] like Fig. 9 As shown, the structure of the second embodiment is basically the same as that of the first embodiment, the difference being that a pressure stabilizing device is also provided in the air inlet chamber A, and its structure is basically the same as that of the pressure stabilizing device provided at the air outlet chamber B. When a pressure stabilizing device is further provided in the air inlet chamber A (before the valve) of the valve body 1, the pressure fluctuation from the original medium can be greatly reduced, and the pressure stabilizing effect is better when combined with the pressure stabilizing device after the valve.

[0051] The above description is an example of a preferred embodiment of the present invention, and the parts not described in detail are all known technologies in the art. The protection scope of the present invention is based on the content of the claims, and any equivalent changes based on the technical inspiration of the present invention are within the protection scope of the present invention.

Claims

1. An electronically controlled pressure reducing and stabilizing valve, the electronically controlled pressure reducing and stabilizing valve comprising: A valve body, a valve cover, a valve core and a valve core driving device, wherein the valve cover is fixedly connected to the valve body, and the valve core is rotatably installed between the valve body and the valve cover; characterized in that: The valve body is provided with an air inlet cavity and an air outlet cavity, the air outlet cavity is provided with a pressure sensor for detecting the pressure of the air outlet cavity and transmitting the detection signal to the electronic control unit; the air outlet cavity is also provided with a voltage stabilizing device, the voltage stabilizing device includes a voltage stabilizing sheet, the voltage stabilizing sheet separates the pressure stabilizing cavity, and the voltage stabilizing sheet is provided with a pressure stabilizing hole; The valve core includes a valve stem and a double valve disc component, the double valve disc component is sleeved on the valve stem, and the two are meshed by a thread pair or a lead screw pair, the valve stem is constrained by an axial limiter to only perform rotational motion, and the double valve disc component is constrained by a radial limiter to only move in the axial direction; one end of the valve stem is recorded as a driving end, the driving end is provided with a magnet, and an angle sensor is provided at a position corresponding to the magnet, and the angle sensor is electrically connected to the electronic control unit; The valve core driving device includes a motor and a gear mechanism, the motor is controlled by the electronic control unit, the gear mechanism includes a meshing driving gear and a driven gear, the driving gear is arranged on the motor output shaft, and the driven gear is arranged on the driving end of the valve stem.

2. The electronically controlled pressure reducing and stabilizing valve according to claim 1, characterized in that: The air inlet cavity is provided with the pressure stabilizing device.

3. The electronically controlled pressure reducing and stabilizing valve according to claim 1, characterized in that: The voltage stabilizing sheet includes a voltage stabilizing sheet 1 and a voltage stabilizing sheet 2 which are arranged at intervals. The voltage stabilizing holes of the voltage stabilizing sheet 1 include a plurality of peripheral holes arranged near the periphery, and the voltage stabilizing holes of the voltage stabilizing sheet 2 include a central hole near its center, and the aperture of the central hole is larger than the aperture of the peripheral holes.

4. The electrically controlled pressure reducing and stabilizing valve according to claim 1, characterized in that: The inner circumferential surface of the double valve disc component is provided with an axially extending chip removal groove, and the chip removal groove disconnects the internal thread of the double valve disc component.

5. The electrically controlled pressure reducing and stabilizing valve according to claim 4, characterized in that: There are multiple chip removal grooves evenly distributed.

6. The electrically controlled pressure reducing and stabilizing valve according to claim 1, characterized in that: A limiting groove is arranged on the outer circumferential surface of the double valve disc component, and the radial limiting member is a limiting pin shaft arranged on the valve body, and one end of the limiting pin shaft is constrained in the limiting groove.

7. The electrically controlled pressure reducing and stabilizing valve according to claim 6, characterized in that: The limiting groove extends in parallel with the axial direction.

8. The electrically controlled pressure reducing and stabilizing valve according to claim 1, characterized in that: The axial limiting member comprises a thrust pad fixedly arranged at the bottom of the valve cover, and the thrust pad is provided with an open slot; the valve stem is provided with an axial limiting slot, and the axial limiting slot is constrained in the open slot.

9. The electrically controlled pressure reducing and stabilizing valve according to claim 8, characterized in that: The open slot is designed as a U-shaped slot.

10. The electrically controlled pressure reducing and stabilizing valve according to any one of claims 1 to 9, characterized in that: The valve body cavity is provided with a valve plate seat, and the valve plate seat is provided with a seat sealing surface 1 and a seat sealing surface 2 with different diameters. The valve plate of the double valve plate component is provided with a valve plate sealing surface 1 and a valve plate sealing surface 2 with different diameters. The valve plate sealing surface 1 and the seat sealing surface 1 as well as the valve plate sealing surface 2 and the seat sealing surface 2 respectively cooperate to form sealing surfaces.

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