Flow adjusting cylinder and flow adjusting and pressure adjusting valve

Abstract

The utility model discloses a flow regulating cylinder and a flow regulating and pressure regulating valve, and relates to the technical field of valves. The mouse cage is provided with a first end and a second end; in the flowing direction of the flowing medium, the first end is located at the front end of the second end; a plurality of through first flow adjusting holes are circumferentially distributed in the circumferential side wall, close to the first end, of the mouse cage; a plurality of through second flow adjusting holes are circumferentially distributed in the circumferential side wall, close to the second end, of the mouse cage; in the axis direction of the mouse cage, at least two first flow adjusting holes correspond to a single second flow adjusting hole, and one first flow adjusting hole is communicated with the second flow adjusting hole in a smooth transition mode. And on the circumferential side wall of the mouse cage, the hole area corresponding to the second flow adjusting hole is larger than the sum of the hole areas of the corresponding first flow adjusting holes. The flow regulating and pressure regulating valve comprises a valve body, a valve rod, a driving mechanism, a crank connecting rod mechanism and the flow regulating cylinder. A more refined flow regulation function can be provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, especially is a kind of flow regulating cylinder and flow regulating pressure regulating valve. BACKGROUND

[0002] Flow regulating pressure regulating valve is widely used in water regulating project due to good water level control, flow control function and pressure holding pressure release control function. Flow regulating pressure regulating valve is mainly through changing the medium flow area between closing part (piston door) and valve seat sealing surface, to achieve the purpose of adjusting liquid medium parameter. The main body structure of the valve adopts inner and outer cylinder type in line with water flow control technology, and the adjusting mechanism is a crank mechanism. The closing part (slider) is a cylindrical piston and flow regulating cylinder, which can be guided by guide rail in the inner cylinder of valve body to move axially along pipeline, so as to change the flow area and realize control and adjustment function. The streamline valve body inner cavity and axial symmetric flow channel can guide fluid in the valve body well and reduce water head loss. The water flow cross section at any position in valve cavity is annular. The annular throttling surface of piston and flow regulating cylinder at any position ensures perfect operation control characteristics of the valve.

[0003] At present, the opening shape of flow regulating cylinder has two kinds of slot type and hole type. Whether it is slot type or hole type, it is uniformly distributed equidiameter slot or equidiameter hole. Such single structure cannot provide more accurate flow regulation function, so that the valve does not meet the accurate percentage characteristics after opening, and the valve is unstable due to sudden increase of flow area at the initial stage of opening. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a kind of flow regulating cylinder and flow regulating pressure regulating valve to solve the problems existing in the prior art, which can provide more accurate flow regulation function.

[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0006] The utility model provides a kind of flow regulating cylinder, including ring cylinder mouse cage;The mouse cage has first end and second end;In the flow direction of flowing medium, the first end is located in the front end of the second end;Multiple first flow regulating holes are distributed on the circumferential side wall of the mouse cage close to the first end;Multiple second flow regulating holes are distributed on the circumferential side wall of the mouse cage close to the second end;In the axial direction of the mouse cage, at least two first flow regulating holes correspond to a single second flow regulating hole, and the rear end of one of the first flow regulating holes is smoothly connected with the front end of the second flow regulating hole;And on the circumferential side wall of the mouse cage, the hole area corresponding to the second flow regulating hole is greater than the sum of the hole area of each first flow regulating hole.

[0007] Preferably, each of the first flow regulating holes is uniformly distributed around the axis of the squirrel cage; each of the second flow regulating holes is uniformly distributed around the axis of the squirrel cage; in the direction of the axis of the squirrel cage, a single second flow regulating hole corresponds to an odd number of first flow regulating holes, and wherein the rear end of the first flow regulating hole in the middle in the circumferential direction of the squirrel cage is in smooth transition communication with the front end of the second flow regulating hole.

[0008] Preferably, in the direction of the axis of the squirrel cage, a single second flow regulating hole corresponds to three first flow regulating holes.

[0009] Preferably, the front end of the squirrel cage is further provided with a piston barrel in the flow direction of the flow medium.

[0010] Preferably, the piston barrel is integrally formed with the squirrel cage.

[0011] Preferably, the outer diameter of the piston barrel is greater than the outer diameter of the squirrel cage; a transition cone surface for limiting and / or metal sealing is arranged between the piston barrel and the squirrel cage; the outer side wall of the piston barrel is connected to the outer side wall of the squirrel cage through the transition cone surface.

[0012] Preferably, a convex ring capable of being connected to the output end of the crank connecting rod mechanism is fixedly arranged on the inner side wall of the piston barrel.

[0013] Preferably, the first flow regulating hole is an oblong hole.

[0014] The utility model also provides a kind of flow regulating valve, including valve body, valve stem, driving mechanism, crank connecting rod mechanism and any one described above flow regulating barrel;The valve body has through flow passage, and flow regulating barrel is arranged in the flow passage;The valve stem is rotatably arranged in the flow passage, and one end of the valve stem extends out of the valve body and is connected with the driving mechanism;The input end of the crank connecting rod mechanism is connected with the valve stem, and the output end of the crank connecting rod mechanism can be connected with the flow regulating barrel;The flow regulating barrel is slidably arranged in the flow regulating barrel along the axis of the valve body.

[0015] Preferably, the crank connecting rod mechanism includes a crank and a connecting rod; a connecting block is fixedly arranged on the flow regulating barrel; one end of the crank is fixedly connected with the valve stem, and the other end of the crank is rotatably connected with one end of the connecting rod around a first axis; the other end of the connecting rod is rotatably connected with the connecting block around a second axis; the first axis and the second axis are parallel, and both are perpendicular to the axis of the valve body.

[0016] Compared with the prior art, the utility model has the following technical effects:

[0017] The flow adjusting cylinder provided by the utility model has the following advantages: the first flow adjusting hole is arranged on the circumferential side wall of the flow adjusting cylinder close to the first end, and the first flow adjusting hole is in multiple circumferential distribution and has a small aperture; when the valve opening is small, the fluid mainly flows out through the small first flow adjusting hole; because the aperture is small and the number is large, the fluid flow is subjected to large resistance when flowing out, and fine adjustment of the flow can be realized; compared with the uniformly distributed equidiameter groove or hole, the uniformly distributed equidiameter groove or hole cannot provide such fine flow and pressure control adjustment when the opening is small; as the valve opening increases, the first flow adjusting hole first plays a main role, and then the second flow adjusting hole gradually participates and plays a greater role; this structure enables the flow change and the valve opening to form a more close-to-equal-percentage relationship, because the small first flow adjusting hole is used for small flow at the beginning, and the second flow adjusting hole is gradually opened for large flow as the opening increases, the flow change is relatively smoother and conforms to the equal-percentage characteristic, and the problem that the existing uniformly distributed structure does not conform to the accurate equal-percentage characteristic after the valve is opened is solved; because the aperture of the first flow adjusting hole is small and the number is large, the flow area increases slowly at the initial opening, and the flow area gradually increases only after the second flow adjusting hole starts to play a role when a certain opening is reached; this design enables the flow area to gradually increase, avoids the situation that the flow area of the traditional uniformly distributed equidiameter groove or hole structure suddenly increases at the initial opening of the valve, thereby effectively solving the flow jump problem caused by the sudden increase of the flow area, and enabling the valve to work more stably; when the valve opening is low, the fluid flows out through the small first flow adjusting hole, the flow rate is relatively low, and the multiple small first flow adjusting holes enable the fluid to flow out in a dispersed manner, thereby avoiding the formation of high-speed concentrated flow of the fluid in a local area, reducing the generation of turbulent flow, and simultaneously, the low flow rate and the dispersed flow mode reduce the possibility of sudden reduction of the fluid pressure, thereby reducing the occurrence of cavitation / cavitation phenomenon; because of the cooperation of the first flow adjusting hole and the second flow adjusting hole, the fluid gradually transitions from the first flow adjusting hole with a small aperture to the second flow adjusting hole with a large aperture, enabling the pressure change of the fluid to be relatively uniform during the whole flow adjusting process, avoiding the concentration of pressure drop in a certain position or at a certain moment, and compared with the uniformly distributed equidiameter groove or hole structure, the pressure can be better adjusted stably; the energy is dispersed through the small first flow adjusting hole first, and then dispersed through the large second flow adjusting hole, thereby avoiding the energy concentrated release of the uniformly distributed equidiameter groove or hole, and the dispersed energy release mode greatly reduces the fluid noise; the smooth transition communication mode provides a buffer space and a buffer time for the fluid, and avoids the vibration problem caused by the sudden expansion of high-speed fluid.

[0018] The utility model also provides a flow and pressure adjusting valve, by adopting the flow adjusting cylinder which can be finely adjusted, the flow and pressure adjusting valve can achieve more fine adjustment effect on the pressure and flow of the fluid. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings described below only constitute some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 The overall structure schematic diagram of the flow regulating cylinder is provided in the present application.

[0021] Figure 2 The cross-sectional structure schematic diagram of the flow regulating cylinder is provided in the present application.

[0022] Figure 3 The first cross-sectional structure schematic diagram of the flow and pressure regulating valve is provided in the present application.

[0023] Figure 4 The second cross-sectional structure schematic diagram of the flow and pressure regulating valve is provided in the present application.

[0024] In the drawings:

[0025] 10-flow regulating cylinder; 11-squirrel cage; 111-first flow regulating hole; 112-second flow regulating hole; 12-piston cylinder; 121-convex ring; 13-transition conical surface;

[0026] 20-valve body; 21-flow guiding cylinder;

[0027] 30-valve rod;

[0028] 40-driving mechanism;

[0029] 50-crank; 51-connecting rod; 52-connecting block. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] The present application provides a flow regulating cylinder and a flow and pressure regulating valve, so as to solve the problems in the prior art and provide more refined flow regulating function.

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0033] Example 1

[0034] This embodiment provides a flow regulating cylinder 10, such as Figures 1-3 As shown, the cage includes an annular cylindrical cage 11; the cage 11 has a first end and a second end; in the flow direction of the flowing medium, the first end is located at the front end of the second end; a plurality of through first flow regulating holes 111 are distributed circumferentially on the circumferential sidewall of the cage 11 near the first end; a plurality of through second flow regulating holes 112 are distributed circumferentially on the circumferential sidewall of the cage 11 near the second end; in the axial direction of the cage 11, at least two first flow regulating holes 111 correspond to a single second flow regulating hole 112, and the rear end of one of the first flow regulating holes 111 and the front end of the second flow regulating hole 112 are smoothly connected (the widths of the first flow regulating hole 111 and the second flow regulating hole 112 are different, and the connection is formed by rounding corners to form a smooth transition connection); and on the circumferential sidewall of the cage 11, the hole area corresponding to the second flow regulating hole 112 is greater than the sum of the hole areas of the corresponding first flow regulating holes 111.

[0035] The first flow regulating holes 111 are distributed in the circumferential side wall of the flow regulating cylinder 10 near the first end, and have a small aperture. When the valve opening is small, the fluid mainly flows out through the small first flow regulating holes 111. Because the holes are small and numerous, the fluid flow is subjected to a large resistance, which can achieve fine adjustment of the flow. In contrast, the uniformly distributed equal-diameter grooves or holes cannot provide such fine flow and pressure control adjustment when the opening is small. As the valve opening increases, the first flow regulating holes 111 first play a major role, and then the second flow regulating holes 112 gradually participate and play a greater role. This structure enables the flow change and valve opening to form a more equal percentage relationship. Because the small first flow regulating holes 111 are used for small flow at the beginning, and the second flow regulating holes 112 are gradually opened for large flow as the opening increases, the flow change is relatively smoother and conforms to the equal percentage characteristic, reducing the problem that the existing uniformly distributed structure does not conform to the precise equal percentage characteristic after the valve is opened. Because the first flow regulating holes 111 are small and numerous, the flow area increases slowly at the beginning. When a certain opening is reached, the second flow regulating holes 112 start to work, and the flow area gradually increases. This design makes the flow area gradually increase, avoiding the sudden increase in flow area at the beginning of the opening of the traditional uniformly distributed equal-diameter groove or hole structure, thereby effectively solving the flow jump problem caused by the sudden increase in flow area, and making the valve work more stably. At low valve opening, the fluid flows out through the small first flow regulating holes 111, and the flow rate is relatively low. The multiple small first flow regulating holes 111 make the fluid flow out dispersedly, avoiding the formation of high-speed concentrated flow in a local area, thereby reducing the generation of turbulence. At the same time, the low flow rate and dispersed flow mode reduce the possibility of sudden reduction of fluid pressure, thereby reducing the occurrence of cavitation / cavitation phenomenon. Due to the cooperation of the first flow regulating holes 111 and the second flow regulating holes 112, the fluid gradually transitions from the small first flow regulating holes 111 to the second flow regulating holes 112 with a larger aperture, making the pressure change relatively uniform during the entire flow regulation process, avoiding the concentration of pressure drop in a certain position or at a certain moment, and better achieving stable regulation of pressure compared with the uniformly distributed equal-diameter groove or hole structure. The small first flow regulating holes 111 are used for preliminary energy dispersion, and then the larger second flow regulating holes 112 are used for further dispersion, avoiding the concentrated energy release like the uniformly distributed equal-diameter groove or hole, and the dispersed energy release mode greatly reduces fluid noise. The smooth transition connection mode provides a buffer space and buffer time for the fluid, avoiding the vibration problem caused by the sudden expansion of high-speed fluid. The multiple small first flow regulating holes 111 disperse the fluid into multiple small flows, which then flow out through the second flow regulating holes 112, making the fluid impact force on the piston cylinder 12 dispersed. Compared with the concentrated large flow impact in the uniformly distributed equal-diameter groove or hole structure, the dispersed small flow impact greatly reduces the impact force on the piston cylinder 12.In the high pressure difference working condition, due to the dispersion and buffering of the fluid through the first flow regulating hole 111 and the second flow regulating hole 112, the flow rate of the fluid reaching the piston cylinder 12 is relatively reduced, and the impact force is uniformly distributed on the piston cylinder 12, avoiding the local area from being concentratedly eroded by the high-speed fluid, and at the same time, the uniform wear also prolongs the service life of the piston cylinder 12, thereby solving the problem of shortening the service life of the valve due to the erosion damage of the piston cylinder 12.

[0036] In the optional scheme of the embodiment, preferably, as shown in Figure 1 and Figure 2 , each first flow regulating hole 111 is uniformly distributed in the circumferential direction of the squirrel cage 11; each second flow regulating hole 112 is uniformly distributed in the circumferential direction of the squirrel cage 11; in the axial direction of the squirrel cage 11, a single second flow regulating hole 112 corresponds to an odd number of first flow regulating holes 111, and among them, the rear end of the first flow regulating hole 111 in the middle of the circumferential direction of the squirrel cage 11 is smoothly connected to the front end of the second flow regulating hole 112. The circumferential uniform distribution of each first flow regulating hole 111 and second flow regulating hole 112 around the axis of the squirrel cage 11 enables the fluid to enter and flow out uniformly in the circumferential direction; this structural design of the flow regulating cylinder 10 improves the structural strength of the flow regulating cylinder 10 to some extent, and the circumferentially uniform distribution of the flow regulating holes makes the stress on the flow regulating cylinder 10 more uniform, reducing the stress concentration phenomenon caused by excessive local opening or uneven distribution, especially in the high pressure difference working condition, uniform stress distribution helps to prevent the flow regulating cylinder 10 from being damaged such as deformation and rupture, improving the reliability and service life of the flow regulating cylinder 10.

[0037] In the optional scheme of the embodiment, preferably, as shown in Figure 1 and Figure 2 , in the axial direction of the squirrel cage 11, a single second flow regulating hole 112 corresponds to three first flow regulating holes 111. From the structural point of view of the flow regulating cylinder 10, the layout of a single second flow regulating hole 112 corresponding to three first flow regulating holes 111 makes the distribution of the openings in the circumferential direction of the flow regulating cylinder 10 more reasonable, and the stress is more uniform. When bearing the fluid pressure, this structure can better disperse the stress, avoid excessive local stress caused by excessive concentration or uneven distribution of openings, thereby improving the structural strength and stability of the flow regulating cylinder 10 and prolonging its service life, especially in harsh working conditions such as high pressure difference, the structural advantage is more obvious.

[0038] In the optional scheme of the embodiment, preferably, as shown in Figures 1-3As shown, the front end of the squirrel cage 11 is also fixedly provided with a piston barrel 12 in the flow direction of the flowing medium (when < DN800, the squirrel cage 11 and the piston barrel 12 are integrally formed; when ≥ DN900, the squirrel cage 11 and the piston barrel 12 are separately formed). The piston barrel 12 can cooperate with the flow regulating barrel 10 to pre-regulate the flow of the fluid, and the piston barrel 12 is used to close the fluid flow, and the flow regulating barrel 10 is used to control the mutual flow of the fluid on both sides.

[0039] In the optional scheme of the embodiment, preferably, the piston barrel 12 is integrally formed with the squirrel cage 11. The integrally formed structure eliminates the connection gap between the piston barrel 12 and the squirrel cage 11, so that the overall structure of the flow regulating barrel 10 is more stable, and when bearing the fluid pressure and impact force, the stress can be uniformly dispersed, avoiding problems such as cracks, deformation or even breakage due to the weak link of the connection part, thereby improving the reliability and service life of the flow regulating barrel 10 under harsh working conditions such as high pressure and high speed fluid.

[0040] In the optional scheme of the embodiment, preferably, as shown in Figure 1 and Figure 2 , the outer diameter of the piston barrel 12 is greater than the outer diameter of the squirrel cage 11; a transition cone surface 13 for limiting and / or metal sealing is arranged between the piston barrel 12 and the squirrel cage 11; and the outer side wall of the piston barrel 12 is connected to the outer side wall of the squirrel cage 11 through the transition cone surface 13. The outer diameter of the piston barrel 12 is greater than the outer diameter of the squirrel cage 11, and the two are connected through the transition cone surface 13, so that the fluid entering the flow regulating barrel 10 can first be preliminarily slowed down and diffused on the outside of the piston barrel 12, and then smoothly flow to the squirrel cage 11 along the transition cone surface 13, avoiding the generation of large turbulence and vortex when the fluid enters the squirrel cage 11 due to the sudden change of the cross section, thereby reducing the flow resistance and improving the stability and efficiency of the fluid flow.

[0041] In the optional scheme of the embodiment, preferably, as shown in Figure 1 and Figure 2 , a convex ring 121 capable of being connected to the output end of the crank block mechanism is fixedly arranged on the inner side wall of the piston barrel 12. The convex ring 121 provides a stable connection point for the crank block mechanism and the piston barrel 12, and can accurately transmit the movement of the crank block mechanism to the piston barrel 12. Through the rotation of the crank block mechanism, the moving position and speed of the piston barrel 12 can be accurately controlled, and the flow in the flow regulating barrel 10 can be accurately adjusted, thereby meeting the requirements of accurate flow control under different working conditions.

[0042] In the optional scheme of the embodiment, preferably, the first flow regulating hole 111 is an oblong hole. The shape of the oblong hole can continuously change the flow area when the fluid passes through within a certain range.

[0043] Embodiment Two

[0044] The embodiment provides a flow and pressure regulating valve, which comprises a valve body 20, a valve rod 30, a driving mechanism 40, a crank connecting block mechanism and a flow regulating cylinder 10 as in the first embodiment. Figures 1-4 The valve body 20 has a flow passage, and the flow passage is provided with a flow guide cylinder 21; the valve rod 30 is rotatably arranged in the flow passage, and one end of the valve rod 30 extends out of the valve body 20 and is connected with the driving mechanism 40; the input end of the crank connecting block mechanism is connected with the valve rod 30, and the output end of the crank connecting block mechanism is connected with the flow regulating cylinder 10; and the flow regulating cylinder 10 is slidably arranged in the flow guide cylinder 21 along the axis of the valve body 20. By adopting the flow regulating cylinder 10 which can be finely adjusted, the flow and pressure regulating valve can finely adjust the pressure and flow of fluid.

[0045] In the optional scheme of the embodiment, preferably, as shown in Figure 3 The crank connecting block mechanism comprises a crank 50 and a connecting rod 51; the flow regulating cylinder 10 is fixedly provided with a connecting block 52; one end of the crank 50 is fixedly connected with the valve rod 30, and the other end of the crank 50 is rotatably connected with one end of the connecting rod 51 about a first axis; the other end of the connecting rod 51 is rotatably connected with the connecting block 52 about a second axis; the first axis and the second axis are parallel and both are perpendicular to the axis of the valve body 20. One end of the crank 50 is fixedly connected with the valve rod 30, the rotation of the valve rod 30 drives the crank 50 to rotate about the connecting point of the crank 50 and the valve rod 30, and the other end of the crank 50 is connected with the connecting block 52 on the flow regulating cylinder 10 through the connecting rod 51, so that the rotary motion of the crank 50 is converted into the linear reciprocating motion of the connecting block 52 and the flow regulating cylinder 10 through the connecting rod 51, the sliding demand of the flow regulating cylinder 10 along the axis of the valve body 20 is met, and the adjustment of the flow and pressure is realized.

[0046] Specifically, the flow and pressure regulating valve of the embodiment is provided with the flow regulating cylinder 10 and other structures which are all prior art and will not be described in detail here.

[0047] The principle and implementation mode of the specific examples are described in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, according to the idea of the utility model, the specific implementation mode and application range will be changed by the general technical personnel in the field; and the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A flow regulator cartridge, characterized by: The mouse cage comprises a ring cylinder; The mouse cage has a first end and a second end; in the flow direction of the flowing medium, the first end is located in front of the second end; The mouse cage has a plurality of first flow regulating holes distributed circumferentially on the circumferential side wall near the first end; the mouse cage has a plurality of second flow regulating holes distributed circumferentially on the circumferential side wall near the second end; In the axial direction of the mouse cage, at least two first flow regulating holes correspond to a single second flow regulating hole, and the rear end of one of the first flow regulating holes is in smooth transition communication with the front end of the second flow regulating hole; and on the circumferential side wall of the mouse cage, the corresponding hole area of the second flow regulating hole is greater than the sum of the hole areas of each corresponding first flow regulating hole.

2. The flow regulator of claim 1, wherein: Each of the first flow regulating holes is uniformly distributed circumferentially around the axis of the mouse cage; each of the second flow regulating holes is uniformly distributed circumferentially around the axis of the mouse cage; In the axial direction of the mouse cage, a single second flow regulating hole corresponds to an odd number of first flow regulating holes, and the rear end of the first flow regulating hole in the middle in the circumferential direction of the mouse cage is in smooth transition communication with the front end of the second flow regulating hole.

3. The flow regulator of claim 2, wherein: In the axial direction of the mouse cage, a single second flow regulating hole corresponds to three first flow regulating holes.

4. The flow regulator of claim 1, wherein: In the flow direction of the flowing medium, the front end of the mouse cage is further provided with a piston cylinder.

5. The flow regulator of claim 4, wherein: The piston cylinder is integrally formed with the mouse cage.

6. The flow regulator of claim 4, wherein: The outer diameter of the piston cylinder is greater than the outer diameter of the mouse cage; a transition cone surface for limiting and / or metal sealing is provided between the piston cylinder and the mouse cage; the outer side wall of the piston cylinder is connected to the outer side wall of the mouse cage through the transition cone surface.

7. The flow regulator of claim 4, wherein: A convex ring capable of being connected to the output end of the crank connecting rod mechanism is fixedly arranged on the inner side wall of the piston cylinder.

8. The flow regulator of claim 1, wherein: The first flow regulating hole is an oblong hole.

9. A flow and pressure regulating valve characterized by: The valve body, the valve stem, the driving mechanism, the crank connecting rod mechanism, and the flow regulating cylinder as claimed in any one of claims 1-8 are included; The valve body has a flow passage, and a flow guide cylinder is arranged in the flow passage; The valve stem is rotatably arranged in the flow passage, and one end of the valve stem extends out of the valve body and is in transmission connection with the driving mechanism; The input end of the crank connecting rod mechanism is in transmission connection with the valve stem, and the output end of the crank connecting rod mechanism can be connected with the flow regulating cylinder; The flow regulating cylinder is slidably arranged in the flow guide cylinder along the axis of the valve body.

10. The flow-regulating pressure-regulating valve according to claim 9, characterized in that: The crank connecting rod mechanism comprises a crank and a connecting rod; A connecting block is fixedly arranged on the flow regulating cylinder; One end of the crank is fixedly connected with the valve stem, and the other end of the crank is rotatably connected with one end of the connecting rod around a first axis; the other end of the connecting rod is rotatably connected with the connecting block around a second axis; the first axis and the second axis are parallel to each other and are both perpendicular to the axis of the valve body.

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