A high-temperature high-pressure ultrafast pulse control valve

Abstract

The application discloses a high-temperature and high-pressure ultrafast pulse control valve, which comprises a valve body, a valve seat, a valve clack with a gas punching hole and a rotary driving mechanism, and the high-frequency pulse airflow is formed by the periodic coincidence of the gas punching hole and the valve seat air hole through the rotation of the valve clack; the innovation is that a spacing fine adjustment mechanism is arranged; the fixed frame is connected with the valve body, and the first flow channel pipe is fixed to the fixed frame; the valve seat is sleeved on the first flow channel pipe and is engaged with the first flow channel pipe through a threaded pair, and the rotary valve seat drives the axial displacement of the valve seat along the first flow channel pipe; the scale line on the outer periphery of the valve seat quantifies the corresponding relationship between the rotary angle and the axial displacement, and the precise adjustment of the micro gap of less than or equal to 0.04mm between the sealing surfaces is realized. The application breaks through the bottleneck of the gap control under the high-temperature working condition of the traditional pulse valve, avoids the noise and spark phenomenon caused by the high-speed rotation of the valve clack, accurately maintains the leakage rate of less than or equal to 5‰ when the pulse frequency is 60Hz, and guarantees the sealing reliability of the fluid scouring test.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid control, in particular to a high-temperature and high-pressure ultrafast pulse control valve. BACKGROUND

[0002] During the service process of the core components (such as metal / composite diaphragms) of high-end equipment such as aerospace engine fuel valves, nuclear reactor cooling systems and deep-sea energy exploitation, the key challenge they face is to withstand extreme transient conditions: high temperature, high pressure and strong corrosive fluid pulse flushing in milliseconds. The traditional steady-state material test method cannot effectively simulate the material failure mechanism caused by such high-energy transient impact, so it is urgent to develop special test equipment that can accurately reproduce the extreme pulse environment in milliseconds.

[0003] In the prior art, a typical pulse generating device adopts a rotating valve flap design. Its core principle is that the end face of the valve flap and the end face of the fixed valve seat are both provided with through holes. By driving the valve flap to rotate at high speed, when the through holes of the valve flap and the valve seat are periodically completely coincided, the high-pressure airflow channel is instantaneously conducted; when they are misaligned, the channel is cut off. By accurately controlling the rotation speed of the valve flap (for example, to achieve 60 times of on-off cycle per second, that is, a pulse frequency of 60Hz), a high-frequency flushing environment for the test diaphragm can be simulated.

[0004] However, this technical solution has a significant technical bottleneck: due to the high temperature characteristics of the test environment, the sealing pair composed of the valve flap and the valve seat must be made of metal hard materials (such as special alloys). Conventional soft sealing materials such as rubber or fluoroplastic cannot be used because they will decompose or soften and fail. The valve flap needs to rotate at high speed while the valve seat is fixed. If the end faces of the two directly contact, severe friction noise and potential sparks will be generated, posing a serious safety hazard. Therefore, a small non-contact gap must be maintained between the sealing pair. The size of this gap directly determines the leakage rate of the system. In order to meet the test accuracy and safety requirements (usually the leakage amount needs to be controlled to be ≤0.5%), both theoretical calculation and engineering practice show that this gap must be strictly limited to a very small range (for example, less than 0.04mm, which is much lower than the diameter of human hair 0.06mm). How to realize and stably maintain this sub-micron non-contact gap under the premise of ensuring the high-speed free rotation of the valve flap is a key technical challenge for designing high-reliability and low-leakage pulse valves, so it is urgent to develop a high-temperature and high-pressure ultrafast pulse control valve with a precise sealing surface fine adjustment mechanism. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings and deficiencies of the prior art and provide a high-temperature and high-pressure ultrafast pulse control valve.

[0006] To achieve the above object, the application provides the following technical scheme: a high-temperature and high-pressure ultrafast pulse control valve, comprising: a valve body, a medium channel is arranged in the valve body; a valve seat is installed in the valve body, and a vent hole in communication with the medium channel is arranged in the valve seat; a valve disc is rotatably supported in the valve body, and a plurality of gas injection holes are distributed on the end face of the valve disc in the circumferential direction; a rotary driving mechanism is connected with the valve disc and used for driving the valve disc to rotate periodically, so that the gas injection hole and the vent hole are periodically coincided to realize intermittent conduction of the medium channel; and a spacing fine adjustment mechanism is used for precisely adjusting the axial gap between the sealing surface of the valve seat and the sealing surface of the valve disc; the spacing fine adjustment mechanism comprises: a fixed frame which is fixedly connected with the valve body; and a first flow channel pipe which is fixedly connected with one end of the fixed frame; the valve seat is sleeved with the other end of the first flow channel pipe and is connected with the first flow channel pipe through a threaded pair; and scale lines are uniformly distributed on the outer circumferential surface of the valve seat, which are used for indicating the corresponding relationship between the rotation angle and the axial displacement.

[0007] As a preferred technical scheme of the application, an internal thread is arranged on the inner wall of the valve seat; an external thread is arranged on the outer wall of the first flow channel pipe; the valve seat is rotated, the external thread is engaged with the internal thread, and the valve seat is driven to move axially along the first flow channel pipe.

[0008] As a preferred technical scheme of the application, a first O-shaped sealing ring is arranged between the outer wall of the first flow channel pipe and the inner wall of the valve seat, and a second O-shaped sealing ring is arranged between the outer wall of the valve seat and the inner wall of the medium channel; a square tooth screw groove is arranged on the outer circumferential surface of the valve seat, a cooling inlet and a cooling outlet are arranged on the valve body and located on the axial two sides of the square tooth screw groove respectively, and the two ends of the square tooth screw groove are communicated with the cooling inlet and the cooling outlet respectively.

[0009] As a preferred technical scheme of the application, the valve body comprises a left valve cover, a right valve cover and a rotary chamber formed by the two valve covers; the valve disc is rotatably supported in the rotary chamber; the valve seat is fixedly installed in each of the left valve cover and the right valve cover, and each valve seat is provided with a set of independent spacing fine adjustment mechanism.

[0010] As a preferred technical scheme of the application, the application further comprises a support base for fixing the valve body; the spacing fine adjustment mechanism further comprises: a stepping motor which is fixed to the support base and has an output shaft connected with a driving gear; a transmission gear which is coaxially fixed to the outer circumferential surface of the valve seat and engaged with the driving gear; and a displacement sensor which is fixed to the valve body through a sensor support, has a detection end pointing to the end face of the valve seat and is used for monitoring the axial displacement of the valve seat.

[0011] As a preferred technical scheme of the present application, the fixing frame comprises a fixing plate connected to the valve body through a support rod, a connecting plate with a sleeve part inserted into a connecting hole of the fixing plate, a baffle arranged at the end of the sleeve part, an adjusting gasket arranged between the baffle and the fixing plate, and a bolt screwed through the baffle, the adjusting gasket and the fixing plate. The connecting plate is coaxially provided with a first mounting hole and a second mounting hole, a first flow channel pipe is fixed to the first mounting hole, and a second flow channel pipe is fixed to the second mounting hole.

[0012] As a preferred technical scheme of the present application, the rotary drive mechanism comprises a drive motor with a second pulley arranged at the output end, a drive shaft with a first pulley arranged at one end and connected to the valve disc and a transmission belt sleeved on the first pulley and the second pulley.

[0013] As a preferred technical scheme of the present application, the drive shaft comprises a first rotary shaft body connected to the end face of the valve disc, a first packing box is arranged in the left valve cover, the inner end of the first rotary shaft body extends into the first packing box, and a first rotary lip-shaped sealing ring, a gasket and a needle bearing are sequentially sleeved on the first rotary shaft body, and the end part of the first packing box is closed by a sealing gland.

[0014] As a preferred technical scheme of the present application, the drive shaft further comprises a second rotary shaft body connected to the other end of the valve disc, a second packing box is arranged in the right valve cover, the inner end of the second rotary shaft body extends into the second packing box, and a second rotary lip-shaped sealing ring, a one-way thrust ball bearing and a deep groove ball bearing are sequentially sleeved on the second rotary shaft body, and the outer end part of the second rotary shaft body is provided with external threads and is axially fixed by a locking nut.

[0015] As a preferred technical scheme of the present application, the first rotary shaft body is provided with a valve stem core assembly fixed relative to the valve body, the valve stem core assembly comprises a plug, a valve core upper end rod, a valve core lower end rod and a water spray disc sequentially connected, a cooling water channel is formed between the plug, the valve core upper end rod and the valve core lower end rod, an inner sleeve is arranged in the cooling water channel, and the inner cavity of the inner sleeve forms a first fluid channel, one end of the inner sleeve extends into the plug and the other end extends into the water spray disc, a water inlet pipe is arranged on the plug, a cooling chamber is arranged in the valve disc, the inner end of the first rotary shaft body is open and communicates with the cooling chamber, the water spray disc is located in the cooling chamber, a second fluid channel is formed between the inner wall of the first rotary shaft body and the outer wall of the valve core lower end rod and communicates with the cooling chamber, a plurality of through holes are arranged on the outer wall of the valve core lower end rod, a third fluid channel is formed between the inner wall of the valve core lower end rod and the outer wall of the inner sleeve, a fourth fluid channel is formed between the inner wall of the valve core upper end cover and the outer wall of the inner sleeve, the third fluid channel and the fourth fluid channel communicate, a water outlet pipe communicating with the fourth fluid channel is arranged on the valve core upper end cover, and the water inlet pipe, the first fluid channel, the second fluid channel, the third fluid channel, the fourth fluid channel and the water outlet pipe form a circulating cooling flow channel.

[0016] Compared with the prior art, the present application has the beneficial effects that: the present application realizes breakthrough effect through the cooperative design of the interval fine adjustment mechanism: the valve seat is sleeved on the first flow channel pipe of the fixed frame, and the precise rotation is converted into axial displacement by the engagement transmission of the threaded pair, and the quantitative indication of the scale line is matched to realize the precise control of the micro gap of ≤0.04mm between the sealing pairs, so that the leakage rate is stable ≤5‰ under the high-frequency pulse working condition, and the problems of wear, noise and spark of the valve disc due to high-speed rotation can be avoided, and the safety performance is improved; the square tooth screw grooves on the outer wall of the valve seat are connected with the cooling inlet and the cooling outlet, and the forced cooling medium flows through the area of the O-shaped sealing ring (to prevent high-temperature gas outside), so that the high-temperature gas is avoided to affect the working of the O-shaped sealing ring, the service life is improved, and the bottleneck of sealing failure and thermal deformation of the transient high-energy flushing test equipment is completely solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the high-temperature high-pressure superfast pulse control valve of the present application;

[0018] Figure 2 is a structural schematic diagram of the interval fine adjustment mechanism in the present application;

[0019] Figure 3 is a structural schematic diagram of the fixed frame in the present application;

[0020] Figure 4 is a structural schematic diagram of the driving shaft and valve stem core assembly in the present application;

[0021] Figure 5 is a structural schematic diagram of the valve stem core assembly in the present application;

[0022] Figure 6 is Figure 4 an enlarged view of part A;

[0023] Figure 7 is Figure 4 an enlarged view of part B;

[0024] Figure 8 is a structural schematic diagram of the end surface of the valve disc in the present application;

[0025] Figure 9 is a structural schematic diagram of the electric control mode driving valve seat movement in the present application;

[0026] Figure 10 is a structural schematic diagram of the first rotating shaft body and the first packing box in the present application;

[0027] Figure 11 is a structural schematic diagram of the second rotating shaft body and the second packing box in the present application.

[0028] 1, valve body; 2, medium passage; 3, valve seat; 4, vent hole; 5, flush hole; 6, rotary drive mechanism; 7, spacing fine adjustment mechanism; 8, fixing frame; 9, first flow pipe; 10, scale; 11, first O-shaped sealing ring; 12, second O-shaped sealing ring; 13, cooling inlet; 14, cooling outlet; 15, square tooth screw groove; 16, left valve cover; 17, right valve cover; 18, rotary chamber; 19, support base; 20, stepping motor; 21, driving gear; 22, transmission gear; 23, displacement sensor; 24, sensor support; 25, fixing plate; 26, support rod; 27, connecting plate; 28, sleeve part; 29, connecting hole; 30, baffle; 31, adjusting gasket; 32, bolt; 33, first mounting hole; 34, second mounting hole; 35, second flow pipe; 36, driving motor; 37, second belt pulley; 38, first belt pulley; 39, transmission belt; 40, first rotary shaft body; 41, first stuffing box; 42, first rotary lip-shaped sealing ring; 43, gasket; 44, needle bearing; 45, sealing gland; 46, second rotary shaft body; 47, second stuffing box; 48, second rotary lip-shaped sealing ring; 49, one-way thrust ball bearing; 50, deep groove ball bearing; 51, locking nut; 52, valve stem core assembly; 53, plug; 54, valve core upper end rod; 55, valve core lower end rod; 56, water spraying disc; 57, cooling water channel; 58, inner sleeve; 59, first fluid channel; 60, second fluid channel; 61, water inlet pipe; 62, cooling chamber; 63, third fluid channel; 64, fourth fluid channel; 65, water outlet pipe; 66, through hole; 67, valve clack; 68, fastening screw. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0031] As Figures 1-11The high-temperature and high-pressure ultrafast pulse control valve shown comprises: a valve body 1, which is internally provided with a medium passage 2; a valve seat 3, which is installed in the valve body 1 and is internally provided with a vent hole 4 in communication with the medium passage 2; a valve clack 67, which is circumferentially provided with a plurality of gas injection holes 5 at an end face thereof and is rotatably supported in the valve body 1; a rotary driving mechanism 6, which is connected with the valve clack 67 and is used for driving the valve clack 67 to periodically rotate, so that the gas injection holes 5 periodically coincide with the vent hole 4 to realize intermittent conduction of the medium passage 2; and a gap fine adjustment mechanism 7, which is used for precisely adjusting an axial gap between a sealing surface of the valve seat 3 and a sealing surface of the valve clack 67; the gap fine adjustment mechanism 7 comprises: a fixed frame 8, which is fixedly connected with the valve body 1; a first flow channel pipe 9, one end of which is fixedly connected with the fixed frame 8; and the valve seat 3 is sleeved on the other end of the first flow channel pipe 9 and is connected with the first flow channel pipe 9 through a threaded pair; the valve seat 3 is uniformly provided with scale lines 10 on an outer circumferential surface thereof, which are used for indicating a corresponding relationship between a rotation angle and an axial displacement, and in the embodiment, manual adjustment or intelligent control can be selected.

[0032] The gap fine adjustment mechanism 7 is cooperatively designed to realize a breakthrough effect: the valve seat 3 is sleeved on the first flow channel pipe 9 of the fixed frame 8, and the rotation is accurately converted into axial displacement through the threaded pair meshing transmission, and the quantitative indication of the scale lines is combined to realize precise control of a micro gap of ≤0.04 mm between the sealing pair, so that the leakage rate is stably ≤5‰ under a high-frequency pulse working condition, and problems such as wear, noise and spark of the valve clack 67 due to high-speed rotation can be avoided, and the safety performance is improved; the square tooth helical groove 15 of the outer wall of the valve seat 3 is connected with the cooling inlet 13 and the cooling outlet 14, and a forced cooling medium flows through the O-shaped sealing ring (to prevent high-temperature gas from flowing out) area, so that the high-temperature gas is prevented from affecting the work of the O-shaped sealing ring, the service life is improved, and the bottleneck of sealing failure and thermal deformation of transient high-energy flushing test equipment is completely solved; it should be noted that the square tooth helical groove 15 and the inner wall of the medium passage 2 form a closed flow channel, so that the cooling water can flow along the path of the square tooth helical groove 15; and the valve seat 3 is fine adjusted in the application, so that the cooling inlet 13 and the cooling outlet 14 are always in communication with the square tooth helical groove 15.

[0033] Since the medium is high-temperature and high-pressure gas, the sealing pair of the valve clack 67 and the valve seat 3 can only select metal sealing materials, and the relative motion speed of the sealing pair is too fast, the linear speed reaches 9.18 m / s, and if contact friction occurs, great noise and spark will be generated, and the safety risk is great, so a gap must be left between the sealing pair. The size of the gap directly affects the leakage rate, and the user leakage rate is ≤5‰, so the gap must be accurately controlled, and the following introduces two forms of manual and intelligent control.

[0034] The key mechanism for fine adjustment is the threaded connection between the valve seat 3 and the first flow channel pipe 9, which is held in position by the fixing frame 8, and the valve seat 3 can be axially moved by rotation. The outer circumference of the rotating sleeve is marked with 100 evenly distributed scale lines 10, and each scale line represents a movement distance of 0.02 mm. Before adjustment, coarse adjustment is performed by adjusting the gasket 31 on the connecting plate 27, and then fine adjustment is performed by the valve seat 3. The method for fine adjustment is as follows: first, rotate the valve seat 3 so that the end surface of the valve seat 3 contacts the end surface of the valve disc 67, and mark the scale; then, rotate the valve seat 3 (in the current state: the end of the valve seat 3 is not tightly attached to the first flow channel pipe 9, and there is a proper gap, which is controlled by the adjusting gasket 31), the valve seat 3 is separated from the plane of the valve disc 67, and then the valve seat 3 is rotated for fine adjustment, the forward scale is reduced by 2 scales compared to the previous one, and then the tightening screw 68 on the side wall of the valve body 1 is tightened to make the inner end of the tightening screw 68 abut against the outer wall of the valve seat 3 (so that the position of the valve seat 3 is fixed), so that the gap between the valve seat 3 and the end surface of the valve disc 67 is 0.04 mm. In this embodiment, the interval fine adjustment mechanism 7 is provided on both sides of the valve disc 67.

[0035] The displacement intelligent control mode of the valve seat 3: further includes a support base 19 for fixing the valve body 1; the interval fine adjustment mechanism 7 further includes: a stepping motor 20 fixed to the support base 19, with its output shaft connected to a driving gear 21; a transmission gear 22 coaxially fixed to the outer circumferential surface of the valve seat 3 and engaged with the driving gear 21; and a displacement sensor 23 fixed to the valve body 1 by a sensor bracket 24, with its detection end pointing to the end surface of the valve seat 3 for monitoring the axial displacement of the valve seat 3. The specific control method is as follows: install the displacement sensor 23 on the sensor bracket 24, control the movement size of the valve seat 3 by the stepping motor 20, install a flowmeter at the outlet end when the valve starts to be debugged, and make the valve disc 67 in a closed state. At this time, the leakage amount of the sealing pair will be displayed by the flowmeter. The load flow of the valve is 1 Kg / s, and the volume under the pressure of 730℃ and 10Mpa is 20.79L / S, i.e. 20.79 dm³ / s. The allowed leakage amount of 5‰ is 20.79 x 5‰ = 0.104 (L / S). The real-time control measurement value of the flowmeter is sent to the PLC control center, the control center compares it with the allowed leakage value, sends instructions to the displacement sensor 23 and the micro stepping motor 20, the micro stepping motor 20 is driven by the gear, the valve seat 3 is threadedly connected with the first flow channel pipe 9, the axial movement of the valve seat 3 can adjust the gap between the valve disc 67 and the valve seat 3, change the leakage rate, and stop until it is satisfactory. The present application does not involve improvement of circuit control, so the corresponding circuit control diagram is not provided, which is the prior art.

[0036] Intelligent control mode of pulse air flow frequency: the valve stem, valve disc 67 combination is driven by the motor at high speed of 450 r / min, the valve disc 67 is evenly distributed with 8 air holes 5 (arc-shaped square hole) on the circumference, and the valve seat 3 has a fixed air hole 4, when the two holes of the valve disc 67 and the valve seat 3 coincide, the air flow is connected, when the two holes do not coincide, the air flow is cut off, so the coincidence of the two holes of the valve disc 67 and the valve seat 3 is used to complete the air flow on-off, and the air flow is realized to be on-off 60 times in 1 second, and the pulse effect of 60HZ is realized. The specific implementation method is: a encoder (not shown in the figure) is installed on the outer circle of the driving shaft which runs synchronously with the valve disc 67, the rotating speed of the valve disc 67 is monitored in real time, because there are eight flow channel holes on the circumference of the valve disc 67, so the ratio of the pulse air flow frequency and the rotating speed of the valve disc 67 is 1:8, if the pulse frequency is required to be 60HZ, the display value of the encoder should be 60÷8=7.5r / s. The rotating speed of the motor is calculated according to the transmission ratio, which is 450 r / min. If the measured data of the encoder is 7r / s, that is, the pulse air flow frequency is 7×8=56(HZ), which does not reach the ideal value, it shows that the rotating speed of the motor is reduced, at this time the encoder will send a command to the central control PLC system, the PLC system automatically adjusts the rotating speed of the motor to 450 r / min through the calculated rotating speed of the motor, the principle of the application is briefly described, and the improvement of the circuit control is not involved, which is the prior art.

[0037] The inner thread is arranged on the inner wall of the valve seat 3, and the outer thread is arranged on the outer wall of the first flow channel pipe 9; by rotating the valve seat 3, the outer thread is engaged with the inner thread to drive the valve seat 3 to move axially along the first flow channel pipe 9.

[0038] The first O-shaped sealing ring 11 is arranged between the outer wall of the first flow channel pipe 9 and the inner wall of the valve seat 3, and the second O-shaped sealing ring 12 is arranged between the outer wall of the valve seat 3 and the inner wall of the medium channel 2; the valve seat 3 is provided with a square thread groove 15 on the outer circumferential surface, the valve body 1 is provided with a cooling inlet 13 and a cooling outlet 14, which are respectively located on the two sides of the square thread groove 15 in the axial direction; the square thread groove 15 is respectively connected with the cooling inlet 13 and the cooling outlet 14 at two ends; the gas temperature in the first flow channel pipe 9 and the second flow channel pipe 35 is 1000K, in order to prevent the high-temperature gas from leaking outside, the O-shaped sealing ring made of fluorine rubber is arranged on the outer wall of the valve seat 3 and the first flow channel pipe 9. In order to ensure the normal work of the O-shaped sealing ring, the square thread pair is designed skillfully. The water circulation is realized by means of the cooling inlet 13, the square thread groove 15 and the cooling outlet 14, and the ideal cooling effect is achieved.

[0039] The valve body 1 comprises a left valve cover 16, a right valve cover 17 and a rotary chamber 18 formed by the two covers; the valve disc 67 is rotatably supported in the rotary chamber 18; the valve seat 3 is fixedly installed in the left valve cover 16 and the right valve cover 17, and each valve seat 3 is provided with a set of independent interval fine adjustment mechanism 7.

[0040] The fixed frame 8 comprises: a fixed plate 25 connected with the valve body 1 through a support rod 26 (the connection mode is a common mode in the mechanical field, which is prior art and thus not specifically described); a connecting plate 27, a sleeve part 28 of which is inserted into a connecting hole 29 of the fixed plate 25; a baffle 30 arranged at an end of the sleeve part 28; an adjusting gasket 31 arranged between the baffle 30 and the fixed plate 25; a bolt 32 penetrating the baffle 30, the adjusting gasket 31 and the fixed plate 25 and being screwed; the connecting plate 27 is coaxially provided with a first mounting hole 33 and a second mounting hole 34, the first flow channel pipe 9 is fixed to the first mounting hole 33, and the second flow channel pipe 35 is fixed to the second mounting hole 34.

[0041] The rotary drive mechanism 6 comprises: a drive motor 36, the output end of which is provided with a second pulley 37; a drive shaft, one end of which is connected with the valve disc 67 and the other end of which is provided with a first pulley 38; and a transmission belt 39, which is sleeved on the first pulley 38 and the second pulley 37.

[0042] The drive shaft comprises a first rotary shaft body 40 connected with the end face of the valve disc 67; a first packing box 41 is arranged in the left valve cover 16; the inner end of the first rotary shaft body 40 extends into the first packing box 41, and is sequentially sleeved with a first rotary lip-shaped sealing ring 42, a gasket 43 and a needle bearing 44 (a single-row needle bearing 44 is adopted); the end part of the first packing box 41 is closed by a sealing gland 45, and the needle bearing 44 is arranged between the first rotary shaft body 40 and the first packing box 41 in the application. The needle bearing 44 has a compact structure and occupies a small space. The inner ring of the needle bearing 44 rotates at a high speed with the valve rod, the outer ring is in contact with the first packing box 41, the sealing is easy and has no friction, the opening and closing operation is easy and labor-saving, and the second rotary shaft body 46 is also designed as a one-way thrust ball bearing 49 and a deep groove ball bearing 50, which can reduce the rotation torque by 40%.

[0043] The drive shaft further comprises a second rotary shaft body 46 connected with the other end of the valve disc 67; a second packing box 47 is arranged in the right valve cover 17; the inner end of the second rotary shaft body 46 extends into the second packing box 47, and is sequentially sleeved with a second rotary lip-shaped sealing ring 48, a one-way thrust ball bearing 49 and a deep groove ball bearing 50; the outer end part of the second rotary shaft body 46 is provided with external threads and is axially fixed through a locking nut 51.

[0044] The first rotating shaft body 40 is provided with a valve stem core assembly 52 fixed relative to the valve body 1 (welded or bolted 32 connected or automatically kept fixed when connected with a rigid water pipe), and the valve stem core assembly 52 includes a plug 53, a valve core upper end stem 54, a valve core lower end stem 55 and a water spray disc 56 connected in sequence, a cooling water channel 57 is formed between the plug 53, the valve core upper end stem 54 and the valve core lower end stem 55, an inner sleeve 58 is arranged in the cooling water channel 57, and the inner cavity of the inner sleeve 58 constitutes a first fluid channel 59, one end of the inner sleeve 58 extends into the plug 53 and the other end extends into the water spray disc 56, a water inlet pipe 61 is arranged on the plug 53, a cooling chamber 62 is arranged in the valve clack 67, the first rotating shaft body 40 is open at the inner end and communicates with the cooling chamber 62, the water spray disc 56 is located in the cooling chamber 62, a second fluid channel 60 is formed between the inner wall of the first rotating shaft body 40 and the outer wall of the valve core lower end stem 55 and communicates with the cooling chamber 62, a plurality of through holes 66 are arranged on the outer wall of the valve core lower end stem 55, a third fluid channel 63 is formed between the inner wall of the valve core lower end stem 55 and the outer wall of the inner sleeve 58, a fourth fluid channel 64 is formed between the inner wall of the valve core upper end cover and the outer wall of the inner sleeve 58, the third fluid channel 63 and the fourth fluid channel 64 communicate, a water outlet pipe 65 communicating with the fourth fluid channel 64 is arranged on the valve core upper end cover, the water inlet pipe 61, the first fluid channel 59, the second fluid channel 60, the third fluid channel 63, the fourth fluid channel 64 and the water outlet pipe 65 constitute a circulating cooling flow channel, and the plug 53, the valve core upper end stem 54, the valve core lower end stem 55 and the water spray disc 56 are fixed and immovable in this embodiment.

[0045] The basic principles, main features and advantages of the present application are shown and described above, and those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A high-temperature, high-pressure, ultrafast pulse control valve, comprising: A valve body (1) is provided with a medium channel (2); a valve seat (3) is installed in the valve body (1), and a vent hole (4) is provided in the valve seat (3) and is communicated with the medium channel (2); a valve flap (67) has a plurality of vent holes (5) distributed along the circumference of the end surface thereof, and the valve flap (67) is rotatably supported in the valve body (1); a rotary drive mechanism (6) is connected to the valve flap (67) and is used to drive the valve flap (67) to rotate periodically so that the vent holes (5) and the vent holes (4) are periodically overlapped to achieve intermittent conduction of the medium channel (2). The invention is characterized in that it further comprises: a spacing fine-tuning mechanism (7) for precisely adjusting the axial gap between the sealing surface of the valve seat (3) and the sealing surface of the valve disc (67); the spacing fine-tuning mechanism (7) comprises: a fixing frame (8) fixedly connected to the valve body (1); a first flow channel tube (9) one end of which is fixedly connected to the fixing frame (8); the valve seat (3) is sleeved on the other end of the first flow channel tube (9) and connected to the first flow channel tube (9) through a threaded pair; and scale lines (10) are uniformly distributed on the outer peripheral surface of the valve seat (3) for indicating the corresponding relationship between the rotation angle and the axial displacement.

2. The high-temperature, high-pressure, ultrafast pulse control valve according to claim 1, characterized in that: The inner wall of the valve seat (3) is provided with an internal thread; the outer wall of the first flow channel (9) is provided with an external thread; by rotating the valve seat (3), the external thread engages with the internal thread to drive the valve seat (3) to move axially along the first flow channel (9).

3. The high-temperature, high-pressure, ultrafast pulse control valve according to claim 1, characterized in that: A first O-ring (11) is provided between the outer wall of the first flow channel tube (9) and the inner wall of the valve seat (3), and a second O-ring (12) is provided between the outer wall of the valve seat (3) and the inner wall of the medium channel (2); a square-tooth spiral groove (15) is provided on the outer peripheral surface of the valve seat (3); a cooling inlet (13) and a cooling outlet (14) are provided on the valve body (1), and the cooling inlet (13) and the cooling outlet (14) are respectively located on both axial sides of the square-tooth spiral groove (15); and the two ends of the square-tooth spiral groove (15) are connected to the cooling inlet (13) and the cooling outlet (14).

4. The high-temperature, high-pressure, ultrafast pulse control valve according to claim 1, characterized in that: The valve body (1) comprises a left valve cover (16), a right valve cover (17) and a rotary chamber (18) formed by the left and right valve covers; the valve flap (67) is rotatably supported in the rotary chamber (18); valve seats (3) are fixedly installed in the left valve cover (16) and the right valve cover (17), and each valve seat (3) is respectively equipped with a set of independent spacing fine-tuning mechanisms (7).

5. The high-temperature, high-pressure, ultrafast pulse control valve according to claim 1, characterized in that: The invention also includes a support base (19) for fixing the valve body (1); the spacing fine-tuning mechanism (7) also includes: a stepping motor (20) fixed to the support base (19), the output shaft of which is connected to the driving gear (21); a transmission gear (22) coaxially fixed to the outer circumferential surface of the valve seat (3) and meshing with the driving gear (21); a displacement sensor (23) fixed to the valve body (1) through a sensor bracket (24), the detection end of which points to the end face of the valve seat (3) and is used to monitor the axial displacement of the valve seat (3).

6. The high-temperature, high-pressure, ultrafast pulse control valve according to claim 5, characterized in that: The fixing frame (8) includes: a fixing plate (25) connected to the valve body (1) through a support rod (26); a connecting plate (27), a sleeve portion (28) of which is inserted into a connecting hole (29) of the fixing plate (25); a baffle (30) arranged at the end of the sleeve portion (28); an adjusting gasket (31) arranged between the baffle (30) and the fixing plate (25); a bolt (32) passing through the baffle (30), the adjusting gasket (31) and the fixing plate (25) for threaded connection; a first mounting hole (33) and a second mounting hole (34) are coaxially provided on the connecting plate (27); the first flow channel tube (9) is fixed to the first mounting hole (33), and the second flow channel tube (35) is fixed to the second mounting hole (34).

7. The high-temperature, high-pressure, ultrafast pulse control valve according to any one of claims 4 to 6, characterized in that: The rotary drive mechanism (6) comprises: a driving motor (36), the output end of which is provided with a second pulley (37); a driving shaft, one end of which is connected to the valve flap (67) and the other end of which is provided with a first pulley (38); and a transmission belt (39) which is sleeved on the first pulley (38) and the second pulley (37).

8. The high-temperature, high-pressure, ultrafast pulse control valve according to claim 7, characterized in that: The drive shaft includes a first rotating shaft body (40) connected to the end face of the valve disc (67); a first stuffing box (41) is opened in the left valve cover (16); the inner end of the first rotating shaft body (40) extends into the first stuffing box (41), and a first rotating lip seal ring (42), a gasket (43), and a needle bearing (44) are sequentially sleeved thereon, and the end of the first stuffing box (41) is closed by a sealing cover (45).

9. The high-temperature, high-pressure, ultrafast pulse control valve according to claim 8, characterized in that: The drive shaft also includes a second rotating shaft (46), which is connected to the other end of the valve disc (67); a second stuffing box (47) is opened in the right valve cover (17); the inner end of the second rotating shaft (46) extends into the second stuffing box (47) and is sequentially sleeved with: a second rotating lip seal (48), a one-way thrust ball bearing (49), and a deep groove ball bearing (50); the outer end of the second rotating shaft (46) is provided with an external thread and is axially fixed by a locking nut (51).

10. The high-temperature, high-pressure, ultrafast pulse control valve according to claim 8 or 9, characterized in that: A valve stem core assembly (52) is provided in the first rotating shaft (40), and the valve stem core assembly (52) is fixed relative to the valve body (1). The valve stem core assembly (52) includes a plug (53), a valve core upper end rod (54), a valve core lower end rod (55) and a water spray disc (56) connected in sequence. A cooling water channel (57) is formed between the plug (53), the valve core upper end rod (54) and the valve core lower end rod (55). An inner sleeve (58) is provided in the cooling water channel (57), and the inner cavity of the inner sleeve (58) constitutes a first fluid channel (59). One end of the inner sleeve (58) extends into the plug (53) and the other end extends into the water spray disc (56). A water inlet pipe (61) is provided on the plug (53). A cooling chamber (62) is provided in the valve disc (67). The inner end of the first rotating shaft (40) is open and communicates with the cooling chamber (62). The water spray The disk (56) is located in the cooling chamber (62), a second fluid channel (60) is formed between the inner wall of the first rotating shaft (40) and the outer wall of the lower end rod (55) of the valve core, and the second fluid channel (60) is connected to the cooling chamber (62), the outer wall of the lower end rod (55) of the valve core is provided with a plurality of through holes (66), the inner wall of the lower end rod (55) of the valve core and the outer wall of the inner sleeve (58) form a third fluid channel (63), the inner wall of the upper end cover of the valve core and the outer wall of the inner sleeve (58) form a fourth fluid channel (64), the third fluid channel (63) and the fourth fluid channel (64) are connected, the upper end cover of the valve core is provided with a water outlet pipe (65) connected to the fourth fluid channel (64), the water inlet pipe (61), the first fluid channel (59), the second fluid channel (60), the third fluid channel (63), the fourth fluid channel (64) and the water outlet pipe (65) constitute a circulating cooling channel.

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