Pilot-operated type flow constant-speed regulating valve for high-pressure liquid

Abstract

The invention relates to the technical field of pilot regulating valves, and discloses a high-pressure liquid pilot type flow constant-speed regulating valve which is composed of a pilot valve and a regulating valve body, the regulating valve body comprises a valve body, a fixing cover, a sleeve, a valve plug and a limiting piece, an input cavity and an output cavity are oppositely formed in the side portion of the valve body, and a communicating groove communicated with the input cavity and the output cavity is formed between the input cavity and the output cavity; the valve body is provided with a mounting connector, the mounting connector is vertically opposite to the communicating groove, a fixing cover is fixed to the mounting connector, a regulation and control rod is rotationally connected into the fixing cover, and a valve element is fixed to the bottom of the regulation and control rod. A first circulation opening and a plurality of second circulation openings are formed in the side portion of the sleeve, and a regulation and control plate is mounted in the circulation openings; when a medium is input, the medium is intensively input into the sleeve from the first circulation opening through displacement of the regulation and control plate in the first circulation opening, so that the flow speed of input of the medium is rapidly increased to the highest speed, and backpressure and medium circulation operation is rapidly achieved through all the channels and the medium channels.

Description

Technical Field

[0001] The present invention relates to the technical field of pilot control valves, and particularly to a high-pressure liquid pilot type flow constant-speed control valve. Background Art

[0002] A pilot control valve is a valve that adjusts parameters such as fluid flow rate, pressure, and temperature through the principle of pilot control. The pilot control valve mainly consists of two parts: a main valve and a pilot valve. The pilot valve is the core control part of the control valve. By sensing the pressure or flow rate change of the medium in the pipeline, this information is fed back to the main valve. The main valve adjusts its opening degree according to the feedback signal of the pilot valve to control the flow rate, pressure, or other parameters of the fluid.

[0003] Currently, when the current stage of pilot control valves transport high-pressure liquid flow rate, through the back pressure formed by the medium input, the valve core moves upward to open the medium channel, so that the medium is output from the lower interface. However, due to the narrow channel for transporting the medium, it takes a certain amount of time for the medium to reach the back pressure effect after input, resulting in a slow reaction speed of the medium output.

[0004] According to a pilot control valve proposed in the Chinese invention application number: CN202310090707.5, by setting throttle holes on the sleeve, the medium sequentially passes through the throttle holes, the first medium channel, the third medium channel, and the second medium channel and quickly enters the first cavity, solving the problem that the medium in the first cavity cannot quickly form back pressure on the valve plug. However, in this solution, multiple throttle holes are opened on the sleeve. When the medium is input, the medium is input from multiple throttle holes at the same time and then transported through the connected channels. However, it is necessary to ensure that the flow rate and flow of the input medium are sufficient to achieve a rapid output reaction of the medium. When the flow rate of the medium becomes low or the flow is insufficient, reverse flow will occur in the upper throttle holes among the multiple throttle holes, resulting in insufficient back pressure and still affecting the flow rate of the medium, leading to unstable speed of the medium output below. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a high-pressure liquid pilot type flow constant-speed control valve, which has the advantages of being able to improve the reaction speed of the medium output and at the same time improve the stability of the medium transportation, and solves the problems of slow back pressure and medium output reaction and unstable medium transportation at the current stage.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention provides the following technical solution: A high-pressure liquid pilot flow constant-speed regulating valve, which consists of a pilot valve and a regulating valve. The regulating valve includes a valve body, a fixed cover, a sleeve, a valve plug and a limiting member. Opposite sides of the valve body are provided with an input chamber and an output chamber, and a communicating groove is provided between the input chamber and the output chamber for communication.

[0009] Both the input chamber and the output chamber have interfaces for connecting to pipelines. The input chamber is used to store the input medium, and the output chamber is used to output the stored medium. The medium entering the input chamber enters the output chamber through the communicating groove under the combined action of the internal sleeve, valve plug and limiting member.

[0010] An installation interface is provided on the valve body. The installation interface is vertically opposite to the communicating groove. A fixed cover is fixed on the installation interface. A regulating rod is rotatably connected inside the fixed cover, and a valve core is fixed at the bottom of the regulating rod.

[0011] The fixed cover is used to seal the top of the installation interface to prevent the medium from flowing out. At the same time, the upper part of the fixed cover is connected to the pilot valve, and the regulating rod is connected to the pilot valve. The pilot valve can drive the regulating rod to rotate to adjust the height of the valve core.

[0012] A sleeve is movable inside the installation interface. The side of the sleeve is threadedly connected to the communicating groove and the installation interface, and there is a gap between the sleeve and the input chamber.

[0013] Threads are provided at the top and bottom of the outer side of the sleeve. By rotating the sleeve, the top thread of the sleeve is connected to the inner side of the top interface of the installation interface, and the bottom thread of the sleeve is connected to the inner side of the interface of the communicating groove, so as to fix the position of the sleeve and facilitate the replacement of the sleeve in the later stage.

[0014] On the side of the sleeve, a first flow port and a plurality of second flow ports are successively arranged from bottom to top along its length direction. A first regulating plate is movably connected in the first flow port, and a second regulating plate is movably connected in the second flow port.

[0015] The diameter of the first flow port is larger than that of the second flow port. When the input of the medium is less, it is input through the first flow port. When the input of the medium is larger, it is transported through the upper second flow port. During transportation, the regulating plate in the flow port generates a position, so that the flow port is communicated with the inside of the sleeve to transport the medium.

[0016] A valve plug is movably sleeved inside the sleeve. A first notch is provided on the valve plug. A second notch is provided at the bottom of the first notch, and a first medium channel communicating with the communicating groove is provided at the bottom of the second notch.

[0017] A first channel communicating with the inside of the first notch is provided on the side of the valve plug.

[0018] A floating disk and a positioning seat are sequentially arranged in the first notch from bottom to top. The positioning seat is fixed on the valve plug, and a second channel is formed between the floating disk and the positioning seat.

[0019] A third channel communicating with the second notch is provided on the floating disk.

[0020] When the medium enters the gap between the sleeve and the valve plug, it is input from the first channel into the second channel, and then input into the second notch through the third channel. Under the pressure of the medium, the floating disk rises, and the floating disk drives the valve core to move upward at the same time, opening the first medium channel and allowing the medium to flow into the output cavity.

[0021] A sleeve hole is provided in the middle of the floating disk, and a second medium channel is provided in the middle of the positioning seat. The valve core is movably connected in the second medium channel, the sleeve hole and the first medium channel.

[0022] The diameter of the valve core matches the diameter in the first medium channel. When the valve core is inserted into the first medium channel, the flow of the medium can be blocked, and when the valve core is disengaged upward from the interface of the first medium channel, the medium can flow to the lower output cavity.

[0023] While the medium is input from the second channel, it is input above the valve plug in the sleeve from the second medium channel. Under the medium pressure, the valve plug is pushed downward, so that the bottom end of the valve plug fully seals the interface at the bottom of the sleeve.

[0024] The first flow port and the second flow port are communicated with the first channel, the second channel, the second medium channel, the third channel and the first medium channel.

[0025] When the medium enters the input cavity, it is input into the sleeve from the first flow port and the second flow port, and is between the sleeve and the valve plug, and is input from the first channel into the second channel. The medium starts to branch, and is first conveyed into the second medium channel, so that the valve plug seals the interface at the bottom of the sleeve downward. At the same time, the medium is input into the second notch from the third channel, pushing up the floating disk, opening the first medium channel, and the medium flows out from the first medium channel to the output cavity.

[0026] A limiting member is installed on the side of the valve plug. The limiting member is used to limit the valve plug from disengaging from the sleeve, and is used to fix the position of the valve plug to prevent the valve plug from disengaging from the sleeve.

[0027] As a further improvement of the above solution, a resistance plate is fixed on the side of the first regulating plate, and a resistance notch is provided on the side of the valve plug. The resistance plate is movably connected in the resistance notch.

[0028] Through the above technical solution, the resistance plate is opposite to the resistance notch. When the medium is input from the input cavity, it impacts the first regulating plate, causing the first regulating plate to displace backward, opening the first flow port. The medium enters the sleeve. At the same time, the resistance plate on the first regulating plate is clamped into the resistance notch to fix the position of the valve plug. Meanwhile, the fixed position of the valve plug can make the bottom of the valve plug fully seal the bottom interface of the sleeve.

[0029] As a further improvement of the above solution, a spring rod is fixed between the second notch and the floating disk.

[0030] Through the above technical solution, the spring rod is used to pull the floating disk downward. When the medium pressure is small, the floating disk drives the valve core to move downward to automatically adjust the size of the interface of the first medium channel.

[0031] As a further improvement of the above solution, a limiting ring is arranged in the sleeve hole. At the same time, a limiting notch is opened on the side of the valve core, and the limiting ring is rotatably connected in the limiting notch.

[0032] Through the above technical solution, the size of the limiting ring matches that in the limiting notch, so that when the floating disk moves up and down, it can drive the valve core to move up and down simultaneously.

[0033] As a further improvement of the above solution, limiting chutes are opened at the bottoms of the first flow port and the second flow port. The length of the limiting chute opened in the second flow port is less than that of the limiting chute opened in the first flow port. At the same time, sliders are arranged at the bottoms of the first regulating plate and the second regulating plate, and the sliders are slidably connected in the limiting chutes.

[0034] Through the above technical solution, according to the size of the medium flow rate, after the bottommost first flow port is opened and the medium flow rate increases, the upper second flow port is opened in sequence, so that the sliders slide in the limiting chutes, improving the stability of the displacement of the regulating plate.

[0035] As a further improvement of the above solution, a stabilizing rod is fixed along the length direction in the limiting chute, and the slider is movably sleeved on the side of the stabilizing rod.

[0036] Through the above technical solution, when the regulating plate moves, the lower slider slides on the side of the stabilizing rod, avoiding deviation and tipping.

[0037] As a further improvement of the above solution, a tension spring is movably sleeved on the side of the stabilizing rod, and the tension spring is located between the limiting chute and the slider.

[0038] Through the above technical solution, the tension spring is used to push the slider, so that when the medium is small, the regulating plate can reduce the interface toward the reset direction until the medium is less than the tension of the corresponding tension spring, and the regulating plate is completely reset to the corresponding flow port.

[0039] As a further improvement of the above solution, a limit frame is fixed at the top inside the second flow port, and the top end of the second regulation plate is attached to the limit frame.

[0040] Through the above technical solution, the limit frame is used to limit the position distance of the second regulation plate during reset. When the second regulation plate resets, due to the large tension of the tension spring, it avoids excessive reset of the second regulation plate.

[0041] As a further improvement of the above solution, the limiting member includes limiting grooves opened at the top and bottom of the side of the valve plug. An upper limiting block is movably connected in the limiting groove at the top, and a lower limiting block is movably connected in the limiting groove at the bottom. A telescopic sleeve rod is provided at the tail ends of the upper limiting block and the lower limiting block, and the telescopic sleeve rod is movably sleeved in the limiting groove.

[0042] Through the above technical solution, two cylindrical holes are opened in the limiting groove, the telescopic sleeve rod is movably sleeved in the cylindrical holes, and at the same time, the sizes of the sides of the upper limiting block and the lower limiting block match the size inside the limiting groove. When the limiting block slides back and forth in the limiting groove, the telescopic sleeve rod moves in the cylindrical hole, improving the stability of the movement of the upper limiting block and the lower limiting block.

[0043] As a further improvement of the above solution, a spring ring is installed between the upper limiting block and the lower limiting block and the limiting groove.

[0044] Through the above technical solution, the spring ring is used to push the corresponding upper limiting block and lower limiting block, so that the front ends of the upper limiting block and the lower limiting block can be attached to the inner wall of the sleeve, improving the stability of the valve plug.

[0045] As a further improvement of the above solution, a limiting ring is provided in the middle of the sleeve, and a limiting rib is provided at the bottom of the sleeve. The upper limiting block is attached to the limiting ring, and the lower limiting block is attached to the limiting rib.

[0046] Through the above technical solution, the upper limiting block is attached to the limiting ring to limit the height of the valve plug in the sleeve, and at the same time, the lower limiting block is attached to the limiting rib to prevent the valve plug from detaching from the sleeve.

[0047] Compared with the prior art, the present invention provides a high-pressure liquid pilot flow constant-speed regulating valve, which has the following beneficial effects:

[0048] 1. For this high-pressure liquid pilot flow constant-speed regulating valve, by opening a first flow port and a plurality of second flow ports on the side of the sleeve and installing a regulating plate in the flow port, when the medium is input, it first passes through the displacement of the regulating plate in the first flow port, so that the medium is concentratedly input into the sleeve from the first flow port, thereby quickly increasing the flow rate of the medium input to the highest speed, and quickly realizing the back pressure and medium flow operation through each channel and the medium channel.

[0049] 2. For this high-pressure liquid pilot-operated flow constant-speed regulating valve, when the medium reaches a certain flow velocity and flow rate state, the regulating plates in multiple flow ports generate displacements in sequence, enabling the flow ports to communicate with the inside of the sleeve. When the flow velocity and flow rate of the medium decrease, under the reaction force of the tension spring installed on the regulating plate, the upper flow ports are automatically closed in sequence, thus preventing the reverse flow of the medium. At the same time, it can ensure the input flow velocity of the medium, so that the medium output below reaches the effect of constant speed and stable transportation.

[0050] 3. For this high-pressure liquid pilot-operated flow constant-speed regulating valve, in any flow velocity state, it can push the first regulating plate in the first flow port. While realizing the flow of the medium, the resistance plate on the first regulating plate is clamped in the resistance notch opened on the side of the valve plug, so that while the valve plug seals the communication groove under the back pressure state, when the pressure of the valve plug is too high, it can limit the position of the valve plug in the sleeve and prevent the valve plug from detaching from the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the internal planar structure of the valve body of the present invention;

[0052] Figure 2 For the present invention Figure 1 Schematic diagram of the structure at A in

[0053] Figure 3 For the present invention Figure 1 Schematic diagram of the structure at B in

[0054] Figure 4 For the present invention Figure 1 Schematic diagram of the structure at C in

[0055] Figure 5 It is a schematic diagram of the overall external structure of the sleeve of the present invention;

[0056] Figure 6 It is a schematic diagram of the horizontal sectional view of the sleeve of the present invention;

[0057] Figure 7 For the present invention Figure 6 Schematic diagram of the structure at D in

[0058] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at D1 in

[0059] In the drawings, the list of components represented by each mark is as follows:

[0060] 1. Valve body; 101. Input cavity; 102. Output cavity; 103. Communication groove; 104. Installation interface;

[0061] 2. Fixed cover; 201. Regulating rod; 202. Spool; 203. Limit notch;

[0062] 3. Sleeve; 301. First flow port; 302. Second flow port; 303. First regulation plate; 304. Second regulation plate; 305. Resistance plate; 306. Limit frame; 307. Limit chute; 308. Slide block; 309. Stabilizing rod; 310. Tension spring; 311. Limit ring; 312. Limit rib

[0063] 4. Valve plug; 401. First notch; 402. Second notch; 403. First channel; 404. Floating disc; 405. Positioning seat; 406. Second channel; 407. Third channel; 408. Spring rod; 409. Second medium channel; 410. Sleeve hole; 4101. Limit ring; 411. First medium channel; 412. Resistance notch

[0064] 5. Limiting member; 501. Limiting groove; 502. Upper limiting block; 503. Lower limiting block; 504. Telescopic sleeve rod; 505. Spring coil Specific embodiments

[0065] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0066] Embodiment 1

[0067] Please refer to Figures 1 - 7 As shown, a high-pressure liquid pilot flow constant-speed regulating valve proposed in this embodiment is composed of a pilot valve (not marked in the figure) and a regulating valve. The regulating valve includes a valve body 1, a fixed cover 2, a sleeve 3, a valve plug 4 and a limiting member 5. An input cavity 101 and an output cavity 102 are oppositely arranged on the side of the valve body 1, and a communicating groove 103 communicating with each other is provided between the input cavity 101 and the output cavity 102.

[0068] Both the input cavity 101 and the output cavity 102 have interfaces connected to pipelines. The input cavity 101 is used to store the input medium, and the output cavity 102 is used to store and output the medium. The medium entering the input cavity 101 enters the output cavity 102 through the communicating groove 103 under the combined action of the internal sleeve 3, the valve plug 4 and the limiting member 5.

[0069] An installation interface 104 is provided on the valve body 1. The installation interface 104 is vertically opposite to the communicating groove 103. A fixed cover 2 is fixed on the installation interface 104. A regulating rod 201 is rotatably connected in the fixed cover 2, and a valve core 202 is fixed at the bottom of the regulating rod 201.

[0070] The fixed cover 2 is used to seal the top of the installation interface 104 to prevent the medium from flowing out. At the same time, the upper part of the fixed cover 2 is connected to the pilot valve, and the regulating rod 201 is connected to the pilot valve. The pilot valve can drive the regulating rod 201 to rotate to adjust the height of the valve core 202.

[0071] A sleeve 3 is movable within the installation interface 104. The side of the sleeve 3 is threadedly connected within the communication groove 103 and the installation interface 104, and there is a gap between the sleeve 3 and the input chamber 101.

[0072] Threads are provided at both the top and bottom of the outer side of the sleeve 3. By rotating the sleeve 3, the top of the sleeve 3 is threadedly connected to the inner side of the top interface of the installation interface 104, and the bottom of the sleeve 3 is threadedly connected to the inner side of the interface of the communication groove 103, thereby fixing the position of the sleeve 3 and facilitating the replacement of the sleeve 3 in the later stage.

[0073] On the side of the sleeve 3, a first flow port 301 and a plurality of second flow ports 302 are sequentially arranged from bottom to top along its length direction. A first regulating plate 303 is movably connected within the first flow port 301, and a second regulating plate 304 is movably connected within the second flow port 302.

[0074] The diameter of the first flow port 301 is larger than that of the second flow port 302. When less medium is input, it is input through the first flow port 301. When a larger amount of medium is input, it is transported through the second flow port 302 above. During transportation, the regulating plate within the flow port generates a position such that the flow port communicates with the inside of the sleeve 3 to transport the medium.

[0075] A valve plug 4 is movably sleeved within the sleeve 3. A first notch 401 is provided on the valve plug 4, a second notch 402 is provided at the bottom of the first notch 401, and a first medium channel 411 communicating with the communication groove 103 is provided at the bottom of the second notch 402.

[0076] A first channel 403 communicating with the inside of the first notch 401 is provided on the side of the valve plug 4.

[0077] A floating disk 404 and a positioning seat 405 are sequentially arranged from bottom to top within the first notch 401. The positioning seat 405 is fixed on the valve plug 4, and a second channel 406 is formed between the floating disk 404 and the positioning seat 405.

[0078] A third channel 407 communicating with the second notch 402 is provided on the floating disk 404.

[0079] When the medium enters the gap between the sleeve 3 and the valve plug 4, it is input from the first channel 403 into the second channel 406, and then input into the second notch 402 through the third channel 407. Under the pressure of the medium, the floating disc 404 rises, and the floating disc 404 drives the valve core 202 to move upward simultaneously, opening the first medium channel 411, allowing the medium to flow into the output cavity 102.

[0080] A sleeve hole 410 is provided in the middle of the floating disc 404, and a second medium channel 409 is provided in the middle of the positioning seat 405. The valve core 202 is movably connected within the second medium channel 409, the sleeve hole 410, and the first medium channel 411.

[0081] The diameter of the valve core 202 matches the diameter within the first medium channel 411. When the valve core 202 is inserted into the first medium channel 411, it can block the flow of the medium, while when the valve core 202 moves upward out of the interface of the first medium channel 411, it can allow the medium to flow to the lower output cavity 102.

[0082] While the medium is being input from the second channel 406, it is also input above the valve plug 4 within the sleeve 3 from the second medium channel 409. Under the pressure of the medium, the valve plug 4 is thus pushed downward, ensuring that the bottom end of the valve plug 4 fully seals the interface at the bottom of the sleeve 3.

[0083] The first flow port 301 and the second flow port 302 are in communication with the first channel 403, the second channel 406, the second medium channel 409, the third channel 407, and the first medium channel 411.

[0084] When the medium enters the input cavity 101, it is input into the sleeve 3 from the first flow port 301 and the second flow port 302, and between the medium and the valve plug 4. It is then input from the first channel 403 into the second channel 406, where the medium starts to branch. First, it is transported into the second medium channel 409, causing the valve plug 4 to seal the interface at the bottom of the sleeve 3 downward. At the same time, the medium is input from the third channel 407 into the second notch 402, pushing up the floating disc 404, opening the first medium channel 411, and the medium flows out from the first medium channel 411 into the output cavity 102.

[0085] A limiting member 5 is installed on the side of the valve plug 4. The limiting member 5 is used to prevent the valve plug 4 from detaching from the sleeve 3 and to fix the position of the valve plug 4, avoiding the valve plug from detaching from within the sleeve 3.

[0086] Embodiment Two

[0087] Please refer to Figure 1 and Figures 5 - 8As shown in the figure, for the high-pressure liquid pilot flow constant-speed regulating valve proposed in this embodiment, on the basis of Embodiment 1, this embodiment further includes that a resistance plate 305 is fixed to the side of the first regulating plate 303. At the same time, a resistance notch 412 is formed in the side of the valve plug 4, and the resistance plate 305 is movably connected in the resistance notch 412.

[0088] More specifically, the resistance plate 305 and the resistance notch 412 are opposite in position. When the medium is input from the input cavity 101, it impacts the first regulating plate 303, causing the first regulating plate 303 to displace backward, opening the first flow port 301. The medium enters the sleeve 3. At the same time, the resistance plate 305 on the first regulating plate 303 is clamped into the resistance notch 412 to fix the position of the valve plug 4. At the same time, the position where the valve plug 4 is fixed can make the bottom of the valve plug 4 fully seal the bottom interface of the sleeve 3.

[0089] Further, a spring rod 408 is fixed between the second notch 402 and the floating disk 404.

[0090] More specifically, the spring rod 408 is used to pull the floating disk 404 downward. When the medium pressure is small, the floating disk 404 drives the valve core 202 to move downward to automatically adjust the size of the interface of the first medium channel 411.

[0091] Further, a limiting ring 4101 is arranged in the sleeve hole 410. At the same time, a limiting notch 203 is formed in the side of the valve core 202, and the limiting ring 4101 is rotatably connected in the limiting notch 203.

[0092] More specifically, the size of the limiting ring 4101 matches that in the limiting notch 203, so that when the floating disk 404 moves up and down, it can drive the valve core 202 to move up and down simultaneously.

[0093] Further, limiting sliding grooves 307 are formed at the bottoms of both the first flow port 301 and the second flow port 302. The length of the limiting sliding groove 307 formed in the second flow port 302 is less than the length of the limiting sliding groove 307 formed in the first flow port 301. At the same time, sliders 308 are arranged at the bottoms of the first regulating plate 303 and the second regulating plate 304, and the sliders 308 are slidably connected in the limiting sliding grooves 307.

[0094] More specifically, according to the size of the medium flow rate, after the lowermost first flow port 301 is opened (the first regulating plate 303 displaces backward), when the medium flow rate increases, the upper second flow port 302 is sequentially opened (the second regulating plate 304 displaces backward), so that the sliders 308 slide in the limiting sliding grooves 307 to improve the stability of the displacement of the regulating plate.

[0095] It should be further noted that since the length of the limiting chute 307 provided in the second flow port 302 is half of the length of the limiting chute 307 provided in the first flow port 301, after the second regulating plate 304 is displaced, it cannot fit against the side of the sleeve 3, thus avoiding blocking the flow of the medium below.

[0096] At the same time, the bottoms of the first regulating plate 303 and the second regulating plate 304 are arranged in a right-angled triangle shape, while the tops are in a vertical plate surface. Among them, the top of the second regulating plate 304 in the topmost second flow port 302 among the multiple second flow ports 302 does not have a vertical plate surface, so as to avoid displacement and blocking of the first channel 403.

[0097] When the medium is being transported, it impacts the plate surface, causing the first regulating plate 303 and the second regulating plate 304 to be displaced backward in the corresponding flow ports, opening the flow ports. The medium is transported upward along the inclined surface of the right-angled triangle surface, thereby improving the smoothness of the medium being concentrated and transported to the first channel 403.

[0098] Furthermore, in the limiting chute 307, a stabilizing rod 309 is fixed along its length direction, and the slider 308 is movably sleeved on the side of the stabilizing rod 309.

[0099] More specifically, when the regulating plate moves, the lower slider 308 slides on the side of the stabilizing rod 309, avoiding deviation and tipping.

[0100] Furthermore, a tension spring 310 is movably sleeved on the side of the stabilizing rod 309, and the tension spring 310 is located between the limiting chute 307 and the slider 308.

[0101] More specifically, the tension spring 310 is used to push the slider 308. When the medium is small, the regulating plate can narrow the interface in the reset direction until the medium is less than the tension of the corresponding tension spring 310, causing the regulating plate to fully reset to the corresponding flow port.

[0102] It should be further noted that the tension of the tension springs below the regulating plates arranged from bottom to top gradually increases, so that when the medium reaches the highest level, all the regulating plates can be fully opened, and when the medium is small, the corresponding number of regulating plates can be opened, ensuring the stability of the medium flow rate.

[0103] Furthermore, a limiting frame 306 is fixed at the top inside the second flow port 302, and the top end of the second regulating plate 304 fits against the limiting frame 306.

[0104] More specifically, the limiting frame 306 is used to limit the reset position distance of the second regulating plate 304. When the second regulating plate 304 resets, due to the large tension of the tension spring 310, it avoids excessive reset of the second regulating plate 304.

[0105] Example 3

[0106] Please refer to Figure 1 and Figures 3 - 4 As shown, for the high-pressure liquid pilot flow constant-speed regulating valve proposed in this embodiment, on the basis of Embodiment 2, this embodiment further includes that the limiting member 5 includes limiting grooves 501 opened at the top and bottom of the side of the valve plug 4. An upper limiting block 502 is movably connected in the limiting groove 501 at the top, and a lower limiting block 503 is movably connected in the limiting groove 501 at the bottom. A telescopic sleeve rod 504 is provided at the tail ends of the upper limiting block 502 and the lower limiting block 503. The telescopic sleeve rod 504 is movably sleeved in the limiting groove 501.

[0107] Two cylindrical holes are opened in the limiting groove 501. The telescopic sleeve rod 504 is movably sleeved in the cylindrical holes. At the same time, the sizes of the sides of the upper limiting block 502 and the lower limiting block 503 match the size in the limiting groove 501. When the limiting blocks slide back and forth in the limiting groove 501, the telescopic sleeve rod 504 moves in the cylindrical holes, improving the stability of the movement of the upper limiting block 502 and the lower limiting block 503.

[0108] A spring ring 505 is installed between the upper limiting block 502 and the lower limiting block 503 and the limiting groove 501.

[0109] More specifically, the spring ring 505 is used to push the corresponding upper limiting block 502 and lower limiting block 503, so that the front ends of the upper limiting block 502 and the lower limiting block 503 can fit against the inner wall of the sleeve 3, improving the stability of the valve plug 4.

[0110] Further, a limiting ring 311 is provided in the middle of the sleeve 3, and a limiting rib 312 is provided at the bottom of the sleeve 3. The upper limiting block 502 fits against the limiting ring 311, and the lower limiting block 503 fits against the limiting rib 312.

[0111] More specifically, the upper limiting block 502 fits against the limiting ring 311 to limit the height of the valve plug 4 in the sleeve 3. At the same time, the lower limiting block 503 fits against the limiting rib 312 to prevent the valve plug 4 from detaching from the sleeve 3.

[0112] When the lower limiting block 503 fits against the limiting rib 312, the bottom of the valve plug 4 fully blocks the bottom interface of the sleeve 3.

[0113] Meanwhile, the upper limit block 502 is arranged vertically in an isosceles triangle shape, while the lower limit block 503 is arranged vertically in a trapezoid shape with the trapezoid inclined surface facing upward, and the top of the limit ring 311 is designed to be inclined towards the center position. When the valve plug 4 moves upward, after the trapezoid inclined surface of the lower limit block 503 fits against the plane at the bottom of the limit ring 311, due to the continuous upward pulling force, the lower limit block 503 retracts into the limit groove 501, so that the valve plug 4 can be separated from the sleeve 3, facilitating the replacement of sleeves 3 with different flow port sizes and also facilitating later maintenance.

[0114] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure liquid pilot flow constant speed regulating valve, consisting of a pilot valve and a regulating valve, characterized in that: The regulating valve comprises a valve body (1), a fixed cover (2), a sleeve (3), a valve plug (4) and a stopper (5); an input chamber (101) and an output chamber (102) are arranged opposite to each other on the side of the valve body (1); a communicating groove (103) is provided between the input chamber (101) and the output chamber (102); The valve body (1) is provided with a mounting interface (104), the mounting interface (104) being vertically opposite to the connecting groove (103), a fixing cover (2) being fixed on the mounting interface (104), a regulating rod (201) being rotatably connected inside the fixing cover (2), and a valve core (202) being fixed at the bottom of the regulating rod (201); A sleeve (3) is movable in the installation interface (104), and a side portion of the sleeve (3) is threadedly connected to the connecting groove (103) and the installation interface (104), and a distance exists between the sleeve (3) and the input cavity (101); A first flow opening (301) and a plurality of second flow openings (302) are sequentially provided on the side of the sleeve (3) along its length direction from bottom to top, wherein a first regulating plate (303) is movably connected in the first flow opening (301), and a second regulating plate (304) is movably connected in the second flow opening (302); A valve plug (4) is movably sleeved in the sleeve (3), a first notch (401) is provided on the valve plug (4), a second notch (402) is provided at the bottom of the first notch (401), and a first medium channel (411) communicating with the connecting groove (103) is provided at the bottom of the second notch (402); A first channel (403) communicating with the first notch (401) is formed on the side of the valve plug (4); A floating plate (404) and a positioning seat (405) are sequentially arranged in the first notch (401) from bottom to top, the positioning seat (405) is fixed on the valve plug (4), and a second channel (406) is formed between the floating plate (404) and the positioning seat (405); The floating plate (404) is provided with a third channel (407) communicating with the second slot (402); A sleeve hole (410) is provided in the middle of the floating plate (404), and a second medium channel (409) is provided in the middle of the positioning seat (405), and the valve core (202) is movably connected in the second medium channel (409), the sleeve hole (410) and the first medium channel (411); The first circulation port (301) and the second circulation port (302) are in communication with the first channel (403), the second channel (406), the second medium channel (409), the third channel (407) and the first medium channel (411); A limiting member (5) is installed on the side of the valve plug (4), and the limiting member (5) is used to limit the valve plug (4) from being separated from the sleeve (3).

2. A high-pressure liquid pilot flow constant speed regulating valve according to claim 1, characterized in that: A resistance plate (305) is fixed to the side of the first regulating plate (303), and a resistance recess (412) is provided on the side of the valve plug (4), and the resistance plate (305) is movably connected in the resistance recess (412).

3. A high-pressure liquid pilot flow constant speed regulating valve according to claim 1, characterized in that: A spring rod (408) is fixed between the second notch (402) and the floating plate (404).

4. A high-pressure liquid pilot flow constant speed regulating valve according to claim 1, characterized in that: A limiting ring (4101) is arranged in the sleeve hole (410), and a limiting recess (203) is provided on the side of the valve core (202), and the limiting ring (4101) is rotatably connected in the limiting recess (203).

5. The high-pressure liquid pilot flow constant speed regulating valve according to claim 1, characterized in that: The bottom of the first circulation port (301) and the bottom of the second circulation port (302) are both provided with a limiting slide groove (307), and the length of the limiting slide groove (307) provided in the second circulation port (302) is smaller than the length of the limiting slide groove (307) provided in the first circulation port (301). At the same time, a slider (308) is provided at the bottom of the first regulating plate (303) and the second regulating plate (304), and the slider (308) is slidably connected in the limiting slide groove (307).

6. A high-pressure liquid pilot flow constant speed regulating valve according to claim 5, characterized in that: A stabilizing rod (309) is fixed in the limiting sliding groove (307) along its length direction, and the sliding block (308) is movably sleeved on the side of the stabilizing rod (309).

7. A high-pressure liquid pilot flow constant speed regulating valve according to claim 6, characterized in that: A tension spring (310) is movably sleeved on the side of the stabilizing rod (309), and the tension spring (310) is located between the limiting sliding groove (307) and the sliding block (308).

8. The high-pressure liquid pilot flow constant speed regulating valve according to claim 5, characterized in that: A limiting frame (306) is fixed at the top of the second flow opening (302), and the top end of the second regulating plate (304) is attached to the limiting frame (306).

9. The high-pressure liquid pilot flow constant speed regulating valve according to claim 1, characterized in that: The limiting member (5) comprises limiting grooves (501) provided at the top and bottom ends of the side of the valve plug (4); an upper limit block (502) is movably connected in the limiting groove (501) at the top end, and a lower limit block (503) is movably connected in the limiting groove (501) at the bottom end; a telescopic sleeve rod (504) is provided at the tail ends of the upper limit block (502) and the lower limit block (503); the telescopic sleeve rod (504) is movably sleeved in the limiting groove (501); A spring ring (505) is installed between the upper limit block (502), the lower limit block (503) and the limit groove (501).

10. The high-pressure liquid pilot flow constant speed regulating valve according to claim 1, characterized in that: A limiting ring (311) is arranged in the middle of the sleeve (3), and a limiting convex strip (312) is arranged at the bottom of the sleeve (3); the upper limiting block (502) is fitted on the limiting ring (311), and the lower limiting block (503) is fitted on the limiting convex strip (312).

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