CN116006741A - A decompression regulating valve with flow limiting and buffering function - Google Patents

Abstract

The invention discloses a decompression regulating valve with a current limiting and buffering function, specifically relates to the technical field of natural gas transportation, comprising a connecting nozzle, a first decompression spring and an electromagnetic flowmeter. The external connection of the connecting nozzle is connected with a current limiting mechanism , the inside of the flow limiting mechanism is provided with a first decompression spring, and the outside of the connecting nozzle is sleeved with an electromagnetic flowmeter. In the present invention, through the set limit collar, buffer valve core, worm gear tooth plate and the first worm gear, when the inflow slot is connected and the gas is transported, the gas pressure first performs the push-up operation on the buffer valve core, through the buffer The elastic expansion and contraction between the spool and the first decompression spring can limit the gas passing through the buffer spool and the limit collar, and can disperse and divert the gas pressure inside the first counterflow channel to the greatest extent. The pressure reducing valve can be adjusted according to the state of the partial pressure according to the size of the gas pressure, so as to realize the partial pressure regulation when the instantaneous flow rate is too large.

Description

A decompression regulating valve with flow limiting and buffering function

technical field

The invention relates to the technical field of natural gas transportation, and more specifically, the invention relates to a pressure reducing regulating valve with a flow limiting and buffering function.

Background technique

The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure through adjustment, and relies on the energy of the medium itself to keep the outlet pressure automatically stable. From the perspective of fluid mechanics, the pressure reducing valve is a local resistance that can The variable throttling element, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of decompression.

Natural gas refers to the mixture of hydrocarbon and non-hydrocarbon gas naturally stored in the formation. During the transportation and circulation of natural gas, it is necessary to use the pressure reducing valve to reduce the pressure and pressure during the transportation of natural gas.

For example, the Chinese patent literature application number is: CN112392979B discloses a high pressure differential pressure reducing regulating valve, including a valve cover, a valve core rod assembly, a packing plate, a connected valve body and a flange, and the inner chamber of the valve body is provided with A valve cage, the valve cage communicates with the inlet and outlet of the valve body respectively, the valve core rod assembly includes a connected valve stem and valve core body, and the valve core body end of the valve core rod assembly is built into the valve cage Among them, the bonnet is sleeved on the outer periphery of the valve stem and connected to the valve body, the packing pressure plate is sleeved on the outer periphery of the valve stem and connected to the bonnet, the space between the bonnet and the valve stem is filled with packing, and the valve The rod is connected with an actuator, and the valve core body is provided with at least two outwardly protruding decompression belts sequentially from top to bottom, and each decompression belt is provided with a decompression groove. In view of the above problems, the present invention provides a high-pressure differential pressure-reducing regulating valve. After passing through the valve body, the high-pressure medium flows into the outlet port of the valve body through multi-stage decompression. The flow out of the valve body can meet the requirements of the low-pressure minimum flow required by the user, and the control accuracy is higher. high.

The above-mentioned decompression regulating valve realizes decompression through the porous throttle ring during decompression, but when the gas is transported and transported, when the gas pressure is quickly loaded on the inlet of the decompression regulating valve, the outlet of the decompression regulating valve will have Large instantaneous overshoot, at this time, it is easy to cause the instantaneous flow rate to be too large when the pressure is reduced, resulting in excessive instantaneous pressure shock, which affects the instantaneous pressure bearing capacity of the pressure reducing valve, and when the long-term high pressure is carried, the existing pressure reducing valve When the pressure valve is running at full load, it is often unable to effectively balance and decompress the pressure, so that the pressure reducing valve cannot perform sufficient and effective decompression operation under the state of high negative pressure, which affects the uniform current limiting and buffering of the pressure reducing valve during decompression , Therefore, it is of great significance to study a pressure reducing regulating valve with the function of limiting and buffering to solve the above problems.

Contents of the invention

In order to overcome the above-mentioned defects of the prior art, the present invention provides a pressure-reducing regulating valve with the function of limiting and buffering. However, when the gas is transported and transported, when the gas pressure is quickly loaded on the inlet of the pressure reducing regulating valve, the outlet of the pressure reducing regulating valve will have a large instantaneous overshoot, which is easy to cause the The instantaneous flow rate is too large, causing the instantaneous pressure shock to be too large, which affects the instantaneous pressure bearing capacity of the pressure reducing valve, and when the existing pressure reducing valve is running at full load under high pressure for a long time, it is often impossible to effectively balance and reduce the pressure. pressure, so that the pressure reducing valve cannot perform sufficient and effective decompression operation in the state of high negative pressure, which affects the uniform current limiting and buffering of the pressure reducing valve during decompression.

In order to achieve the above object, the present invention provides the following technical solutions: a pressure reducing regulating valve with a flow limiting and buffering function, including a connecting nozzle, a first pressure reducing spring and an electromagnetic flowmeter, the external connection of the connecting nozzle is limited flow mechanism, the inside of the current limiting mechanism is provided with a first decompression spring, the outside of the connecting nozzle is provided with an electromagnetic flowmeter, the inside of the current limiting mechanism is provided with a control mechanism, and the inside of the current limiting mechanism A rotating circulation mechanism is installed, a pressure relief mechanism is arranged inside the current limiting mechanism, a guiding mechanism is connected to the bottom end of the regulating mechanism, and the top end of the regulating mechanism is fixedly connected to the bottom end of the first pressure relief spring, so The detection end of the electromagnetic flowmeter is inserted inside the current limiting mechanism;

The control mechanism includes a limit collar, a buffer valve core, a worm gear plate, a first worm wheel, a first worm, a connecting guide rod and a second worm, and the limit collar is fixedly connected to the inner wall of the flow limiting mechanism , the buffer valve core is inserted inside the limit collar, the worm gear tooth plate is fixedly connected to the outer wall of the buffer valve core, and the first worm gear is installed on the outer wall of the limit collar through a movable seat , the first worm meshes on the outside of the first worm wheel, the connecting guide rod is connected to the bottom end of the first worm, the second worm meshes on the outer side wall of the connecting guide rod, and the outer side of the connecting guide rod The surface is a metal steel pipe with a smooth structure, the first worm wheel is rotationally connected to the outside of the limit collar, there is sliding friction between the buffer valve core and the limit collar, and the buffer valve core is in the position of the limit collar. internal sliding connection, the first worm and the second worm are both arranged on the inner side wall of the bottom end of the flow limiting mechanism through the connecting plate seat;

The flow limiting mechanism includes an inflow notch, an annular groove, a first counterflow channel, a second counterflow channel, an outflow channel and a shell plate cover, and the shell plate cover is sleeved on the outside of the connecting nozzle. The inflow notch is set inside the shell plate cover, the annular groove is set on one side of the inflow notch, the first counter flow channel is set at the bottom end of the inflow notch, and the second counter flow channel is set at the bottom of the inflow notch. One side end of the shell plate cover, the outflow channel is opened on the right side of the shell plate cover.

As a further solution of the present invention: the annular groove communicates with the outflow flow channel through a regulating mechanism, the first counter flow channel is horizontally opened at the bottom end of the shell plate cover, and the first counter flow channel is connected to the second counter flow channel. The liquid outlets of the two opposing flow channels are perpendicular to each other, and one side of the second opposing flow channel communicates with the inside of the pressure relief mechanism.

As a further solution of the present invention: the rotating circulation mechanism includes a rotating disc base, a seepage hole groove and a return telescopic spring, the rotating disc base is fixedly connected to the top of the second worm, and the top outer surface of the rotating disc base is provided with The seepage hole groove, the top of the rotating disk seat is fixedly connected with a reset telescopic spring, the top of the rotating disk seat is installed with a rotating seat, and a ball is inserted inside the rotating seat, and the rotating seat and the restoring telescopic spring The tops are all fixedly connected with seepage limiting plates.

As a further solution of the present invention: the outer surface of the seepage limiting plate is provided with seepage holes, and the size and position of the seepage limiting plate and the seepage holes provided on the rotating disk seat are all in one-to-one correspondence, and the reset telescopic spring passes through Screws are fixedly installed on the bottom end of the seepage limiting plate and the top outer wall of the rotating disk seat, the seepage limiting plate is connected by rotation on the rotating disk seat through the rotating seat, and the seepage limiting plate is elastically rotated with the reset telescopic spring connect.

As a further solution of the present invention: the pressure relief mechanism includes a guide plate, a pressure relief telescopic plate and a connecting seat, the guide plate is arranged on the inner side wall of the flow limiting mechanism, and a pressure relief telescopic plate is inserted inside the guide plate. plate, the top end of the pressure relief telescopic plate is fixedly connected with a connecting seat, and a second decompression spring is sheathed on the outside of the connecting seat.

As a further solution of the present invention: the pressure relief telescopic plate is connected to the outside of the second decompression spring through the connecting seat, and the pressure relief telescopic plate is elastically telescopically connected to the second decompression spring, and the inner side of the pressure relief telescopic plate is connected to the second decompression spring. The second counterflow channel is connected.

As a further solution of the present invention: the guide mechanism includes a worm guide wheel, a rotating bearing seat and a second worm wheel, the worm guide wheel is fixedly connected to the bottom end of the first worm, and the bottom end of the worm guide wheel is connected with a rotating The bearing housing, the outer surface of the worm guide wheel is meshed with the second worm wheel.

As a further solution of the present invention: the second worm gear is sleeved on the outside of the connecting guide rod, and two second worm gears are sleeved on both sides of the outside of the connecting guide rod, and the worm guide wheel is inside the rotating bearing seat Turn to connect.

The beneficial effects of the present invention are:

1. In the present invention, through the set limit collar, buffer valve core, worm gear tooth plate and the first worm gear, when the inflow slot is connected to carry out gas transportation, the gas pressure first performs the push-up operation on the buffer valve core, Through the elastic expansion and contraction between the buffer spool and the first decompression spring, the gas passes through the limit between the buffer spool and the limit collar, and the gas flow is decelerated, and the buffer spool is stretched, and the air pressure is circulated. At this time, the tooth plate of the worm gear is meshed with the first worm wheel to drive the first worm wheel to rotate, so that after the first worm meshes with the first worm wheel, it drives the rotation control of the first worm, and then the bottom of the first worm The end is connected through the guidance of the guide mechanism, so that the second worm can be rotated to control the rotation of the rotating disc seat, and the rotating disc seat and the seepage hole groove on the seepage limiting plate can be rotated and limited. When the buffer valve core is at the top When stretching to the top, the number of rotations of the first worm is the largest, and the number of rotations of the second worm is the largest. At this time, the seepage holes on the rotating disc seat and the seepage limiting plate are in the corresponding state of opening, which can be used for the first worm. The gas pressure inside the flushing channel is dispersed and diverted to the greatest extent, and then the distance when the valve core is extended to control the number of rotations of the first worm, which is convenient for self-adaptive regulation of the seepage hole when limiting the position, so that the reduction The pressure valve can adjust the partial pressure with the state according to the size of the gas pressure, and realize the partial pressure regulation when the instantaneous flow rate is too large;

2. The present invention makes it possible for the buffer valve core to be at the extreme value of the top extension state when the instantaneous pressure is too high or the pressure is too high for a long time through the set guide plate, pressure relief telescopic plate, connecting seat and second pressure relief spring. After the gas is preliminarily decompressed through the limit between the limit collar and the buffer valve core, the gas is restricted by the pressure regulation too low, so the gas still circulates at high pressure. After the inside of the flow channel, due to the excessive pressure, the gas will perform an inward extension operation on the pressure relief expansion plate, so that the connecting seat can control the inward expansion and contraction adjustment of the pressure relief expansion plate after elastic expansion and contraction with the second pressure relief spring , so that the gas flowing out of the flow channel can be decompressed for the second time through the setting of the pressure relief mechanism, and the depressurized gas is discharged through the second counter flow channel, so as to realize the safe pressure relief of the gas during the decompression, so that the gas The fine flow makes several right-angle turns and decompression adjustments, so that it enters the next group of throttling flow channels after multi-stage pressure drop, and performs current limiting and buffering operations during depressurization to reduce the flow rate of the airflow;

3. In the present invention, when the airflow pressure is transported under continuous high-pressure state through the set pressure relief mechanism, regulating mechanism, rotating circulation mechanism and guiding mechanism, firstly, through the setting of the regulating mechanism, a part of the airflow can be slowly flowed, and then through the pressure relief The mechanism is set to slow down the other part of the airflow, and the output ports of the second counterflow channel and the first counterflow channel are vertically arranged inside the outflow channel. Throttling the flow channel, so that at this time, when the two groups of trickle gas are output, they can be directly in the flow channel and the air flow directly in the flow channel for three-way hedging, and finally transported after confluence, thereby reducing the gas flow in the flow channel. The high flow rate can effectively reduce the excessive instantaneous flow caused by short-term high negative pressure, which affects the flow limiting and buffering capacity of the pressure reducing valve.

Description of drawings

Fig. 1 is the three-dimensional structural representation of the present invention;

Fig. 2 is a schematic front view of the structure of the current limiting mechanism in Fig. 1 of the present invention;

Fig. 3 is a partial overall schematic diagram of the structure of the current limiting mechanism in Fig. 1 of the present invention;

Fig. 4 is the overall schematic diagram of the structure of the regulating mechanism in Fig. 2 of the present invention;

Fig. 5 is a schematic diagram of the overall structure of the rotary circulation mechanism in Fig. 2 of the present invention;

Fig. 6 is the enlarged schematic diagram of the structure at place A in Fig. 2 of the present invention;

FIG. 7 is an enlarged schematic diagram of the structure at B in FIG. 4 of the present invention.

In the figure: 1. Connecting nozzle; 2. Current limiting mechanism; 201. Inflow slot; 202. Annular groove; 203. First counterflow channel; 204. Second counterflow channel; 205. Outflow channel; 206 , shell plate cover; 3, first decompression spring; 4, electromagnetic flowmeter; 5, control mechanism; 501, limit collar; 502, buffer valve core; , the first worm; 506, the connecting guide rod; 507, the second worm; 6, the rotating circulation mechanism; 601, the rotating disc seat; 602, the seepage hole groove; 603, the reset telescopic spring; 7, pressure relief mechanism; 701, guide plate; 702, pressure relief telescopic plate; 703, connection seat; 704, second pressure relief spring; 8, guide mechanism; 801, worm guide wheel; 802, rotating bearing seat ; 803, the second worm gear.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1-7, the present invention provides a pressure-reducing regulator valve with a current-limiting buffer function, including a connecting nozzle 1, a first pressure-relief spring 3 and an electromagnetic flowmeter 4, and the external connection of the connecting nozzle 1 The current limiting mechanism 2 is provided with a first decompression spring 3 inside the current limiting mechanism 2, and the outside of the connecting nozzle 1 is provided with an electromagnetic flowmeter 4, and the inside of the current limiting mechanism 2 is provided with a control mechanism 5, and the current limiting mechanism 2 A rotating circulation mechanism 6 is installed inside the current limiting mechanism 2, a pressure relief mechanism 7 is arranged inside the flow limiting mechanism 5, a guiding mechanism 8 is connected to the bottom end of the regulating mechanism 5, and the top end of the regulating mechanism 5 is fixedly connected to the bottom of the first decompression spring 3 end, the detection end of the electromagnetic flowmeter 4 is inserted inside the current limiting mechanism 2;

The control mechanism 5 includes a limit collar 501, a buffer spool 502, a worm gear plate 503, a first worm gear 504, a first worm 505, a connecting guide rod 506 and a second worm 507, and the limit collar 501 is fixedly connected to the current limiting On the inner wall of the mechanism 2, the buffer valve core 502 is inserted inside the limit collar 501, the worm gear plate 503 is fixedly connected to the outer wall of the buffer valve core 502, and the first worm gear 504 is installed on the limit sleeve through a movable seat. On the outer wall of the ring 501, the first worm 505 is engaged on the outside of the first worm wheel 504, the connecting guide rod 506 is connected to the bottom end of the first worm 505, the second worm 507 is engaged on the outer wall of the connecting guide rod 506, and connected The outer surface of the guide rod 506 is a metal steel pipe with a smooth structure. The first worm gear 504 is rotationally connected to the outside of the limit collar 501. There is sliding friction between the buffer spool 502 and the limit collar 501, and the buffer spool 502 Slidingly connected inside the limiting collar 501, the first worm 505 and the second worm 507 are both arranged on the inner side wall of the bottom end of the flow limiting mechanism 2 through the connecting plate seat;

The flow limiting mechanism 2 includes an inflow notch 201, an annular groove 202, a first counterflow channel 203, a second counterflow channel 204, an outflow channel 205 and a shell plate cover 206, and the shell plate cover 206 is sleeved on the connection nozzle 1 The inflow notch 201 is provided inside the shell plate cover 206, the annular groove 202 is provided on one side of the inflow notch 201, the first counterflow channel 203 is provided at the bottom end of the inflow notch 201, and the second counterflow channel The channel 204 is opened at one end of the shell plate cover 206, and the outflow flow channel 205 is opened on the right side of the shell plate cover 206, and the annular groove 202 and the outflow flow channel 205 are connected through the regulating mechanism 5, and the first pair of flushing flow The channel 203 is opened horizontally at the bottom of the shell plate cover 206, the first counterflow channel 203 is perpendicular to the liquid outlet of the second counterflow channel 204, and one side of the second counterflow channel 204 communicates with the inside of the pressure relief mechanism 7 When the cushioning spool 502 is in the extension operation, the worm gear plate 503 is meshed with the first worm wheel 504, so that the first worm wheel 504 can rotate the first worm 505 after the rotation, thereby controlling the first worm gear 504. After the worm 505 rotates, the second worm 507 can be controlled to rotate through the guidance of the guide mechanism 8, and then the rotating disc seat 601 connected to the top of the second worm 507 can be rotated, and the convective flow in the first convective flow can be controlled. The gas inside the channel 203 is diverted and released. The model of the electromagnetic flowmeter 4 is LDT125-250.

As shown in Figure 2, the annular groove 202 and the outflow flow channel 205 are connected through the regulating mechanism 5, and the first counter flow channel 203 is horizontally set at the bottom end of the shell plate cover 206, and the first counter flow channel 203 is connected to the second counter flow channel 203. The liquid outlets of the counterflow channel 204 are vertical, one side of the second counterflow channel 204 is connected to the inside of the pressure relief mechanism 7, the outer surface of the seepage limiting plate 605 is provided with a seepage hole groove 602, and the seepage limiting plate 605 The size and position of the seepage holes 602 provided on the rotating disc seat 601 correspond one by one. The reset telescopic spring 603 is fixed and installed on the bottom end of the seepage limiting plate 605 and the top outer wall of the rotating disc seat 601 by screws, and the seepage is limited. The plate 605 is connected in rotation on the rotating disk base 601 through the rotating seat 604, and the seepage limiting plate 605 is elastically rotationally connected with the reset telescopic spring 603. After the second worm 507 rotates, it drives the rotating disk base 601 to rotate, and the rotating disk base 601 is rotated. and the seepage holes 602 on the seepage limiting plate 605 are rotated to limit the operation, and the corresponding limit control is performed by rotating the disk seat 601 and the seepage holes 602 on the seepage limiting plate 605, so that the first counter flow channel 203 The internal gas pressure is dispersed and diverted to different degrees.

As shown in Figure 5 and Figure 7, the pressure relief mechanism 7 includes a guide plate 701, a pressure relief expansion plate 702 and a connecting seat 703, the guide plate 701 is arranged on the inner side wall of the current limiting mechanism 2, and the inside of the guide plate 701 is inserted with The pressure relief telescopic plate 702, the top of the pressure relief telescopic plate 702 is fixedly connected with a connection seat 703, the outside of the connection seat 703 is provided with a second decompression spring 704, and the pressure relief telescopic plate 702 is connected to the second decompression spring 704 through the connection seat 703. The outside of the spring 704, and the pressure relief telescopic plate 702 is elastically telescopically connected with the second decompression spring 704, the inner side of the pressure relief telescopic plate 702 is connected with the second opposite flow channel 204, and the guide mechanism 8 includes a worm guide wheel 801, a rotating bearing Seat 802 and the second worm wheel 803, the worm guide wheel 801 is fixedly connected to the bottom end of the first worm 505, the bottom end of the worm guide wheel 801 is connected with a rotating bearing seat 802, and the outer surface of the worm guide wheel 801 is meshed with the second worm wheel 803 , the second worm gear 803 is sleeved on the outside of the connecting guide rod 506, and two second worm gears 803 are sleeved on both sides of the outside of the connecting guide rod 506, and the worm guide wheel 801 is rotationally connected inside the rotating bearing seat 802, through The elastic expansion and contraction of the connecting seat 703 and the second decompression spring 704 can perform the operation of splitting and releasing the pressure of the gas after the expansion and contraction of the pressure relief telescopic plate 702 .

The working principle of the present invention:

S1. First, when the inflow slot 201 is connected to carry out the gas transportation, the gas pressure firstly pushes the buffer valve core 502, and drives the elastic expansion and contraction between the buffer valve core 502 and the first decompression spring 3, and the gas Through the limit between the buffer spool 502 and the limit collar 501, the deceleration control is performed, and then when the buffer spool 502 is extended, the worm gear plate 503 is meshed with the first worm gear 504, which can drive the first worm gear. The worm wheel 504 is rotating, so that the first worm 505 can rotate the first worm 505 after meshing with the first worm 504, and then the worm guide wheel 801 at the bottom of the first worm 505 drives the second worm 803 after rotating. Rotate, control the connecting guide rod 506 to conduct the guiding and rotating operation, drive the second worm 507 to rotate, thereby controlling the rotation of the rotating disk base 601, and rotating the rotating disk base 601 and the seepage hole groove 602 on the seepage limiting plate 605 Limit movement, when the pressure is the largest and the buffer spool 502 moves to the top, the number of rotations of the first worm 505 is the largest at this time, and the number of rotations of the second worm 507 is the largest through the guidance of the guide mechanism 8, thereby controlling The rotating disk base 601 and the seepage holes 602 on the seepage limiting plate 605 are in a vertically corresponding state, so that the gas pressure inside the first counterflow channel 203 can be dispersed and diverted to the greatest extent, thereby facilitating the operation of the rotating circulation mechanism 6 . Pressure control and regulation can be carried out during diversion;

S2. After the gas adjusted by the first decompression spring 3 flows into the inside of the outflow channel 205, the pressure inside the outflow channel 205 is too high, causing the gas to push inwardly against the pressure relief telescopic plate 702 Stretch operation, drive the connecting seat 703 to elastically expand and contract with the second decompression spring 704, control the inward expansion and contraction adjustment of the pressure relief expansion plate 702, so that part of the gas flowing out of the flow channel 205 is set for a second time through the setting of the pressure relief mechanism 7 depressurization, and then the decompressed gas is discharged through the second counterflow channel 204 to realize the safe pressure relief of the gas during depressurization. At this time, the airflow output from the first counterflow channel 203 and the second counterflow channel 204 After hedging and merging, it flows into the flow channel of the outflow channel 205, so that when the two groups of trickle gases are output at this time, the three-way hedging can be performed between the inside of the outflow channel 205 and the air flow that directly circulates inside the outflow channel 205, and finally in the outflow channel 205. Transport after confluence, thereby reducing the flow velocity of the gas in the outflow channel 205 .

The last few points should be explained: First, in the description of this application, it should be explained that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, which can be mechanical connection Or electrical connection, it can also be the internal communication of two components, it can be directly connected, "up", "down", "left", "right", etc. are only used to indicate the relative positional relationship, when the absolute position of the object being described Change, the relative positional relationship may change;

Secondly: in the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved, other structures can refer to the usual design, and the same embodiment and different embodiments of the present invention can be combined with each other if there is no conflict;

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (8)

1. The utility model provides a decompression governing valve with current limiting buffering function, includes connecting tube mouth (1), first pressure reducing spring (3) and electromagnetic flowmeter (4), its characterized in that: the device is characterized in that a current limiting mechanism (2) is connected to the outside of the connecting pipe orifice (1), a first pressure reducing spring (3) is arranged in the current limiting mechanism (2), an electromagnetic flowmeter (4) is sleeved outside the connecting pipe orifice (1), a regulating mechanism (5) is arranged in the current limiting mechanism (2), a rotary circulation mechanism (6) is arranged in the current limiting mechanism (2), a pressure releasing mechanism (7) is arranged in the current limiting mechanism (2), a guiding mechanism (8) is connected to the bottom end of the regulating mechanism (5), the top end of the regulating mechanism (5) is fixedly connected to the bottom end of the first pressure reducing spring (3), and a detection end of the electromagnetic flowmeter (4) is inserted into the current limiting mechanism (2);

the regulating mechanism (5) comprises a limit sleeve ring (501), a buffer valve core (502), a worm gear toothed plate (503), a first worm gear (504), a first worm (505), a connecting guide rod (506) and a second worm (507), wherein the limit sleeve ring (501) is fixedly connected to the inner side wall of the current limiting mechanism (2), the buffer valve core (502) is inserted into the limit sleeve ring (501), the worm gear toothed plate (503) is fixedly connected to the outer side wall of the buffer valve core (502), the first worm gear (504) is mounted on the outer side wall of the limit sleeve ring (501) through a movable seat, the first worm (505) is meshed to the outer side of the first worm gear (504), the connecting guide rod (506) is connected to the bottom end of the first worm gear (505), the second worm (507) is meshed to the outer side wall of the connecting guide rod (506), the outer surface of the connecting guide rod (506) is a metal steel pipe with a smooth structure, the first worm (504) is connected to the outside of the limit sleeve ring (501) in a rotating mode, the buffer valve core (502) is connected to the limit sleeve ring (501) in a sliding mode, the buffer valve core (501) in a sliding mode, the first worm (505) and the second worm (507) are arranged on the inner side wall of the bottom end of the flow limiting mechanism (2) through a connecting plate seat;

the flow limiting mechanism (2) comprises an inflow notch (201), an annular groove (202), a first opposite flushing flow channel (203), a second opposite flushing flow channel (204), an outflow flow channel (205) and an outer shell plate cover (206), wherein the outer shell plate cover (206) is sleeved outside a connecting pipe orifice (1), the inflow notch (201) is formed in the outer shell plate cover (206), the annular groove (202) is formed in one side of the inflow notch (201), the first opposite flushing flow channel (203) is formed in the bottom end of the inflow notch (201), the second opposite flushing flow channel (204) is formed in one side end of the outer shell plate cover (206), and the outflow flow channel (205) is formed in the right side of the outer shell plate cover (206).

2. The pressure reducing and regulating valve with flow limiting and buffering functions according to claim 1, wherein: the annular groove (202) is communicated with the outflow channel (205) through a regulating mechanism (5), the first pair of flushing channels (203) are horizontally arranged at the bottom end of the outer shell plate cover (206), the first pair of flushing channels (203) are perpendicular to the liquid outlet of the second pair of flushing channels (204), and one side of the second pair of flushing channels (204) is communicated inside the pressure release mechanism (7).

3. The pressure reducing and regulating valve with flow limiting and buffering functions according to claim 1, wherein: the rotary circulation mechanism (6) comprises a rotary disc seat (601), a seepage hole groove (602) and a reset telescopic spring (603), wherein the rotary disc seat (601) is fixedly connected to the top end of a second worm (507), the seepage hole groove (602) is formed in the outer surface of the top end of the rotary disc seat (601), the reset telescopic spring (603) is fixedly connected to the top end of the rotary disc seat (601), a rotary seat (604) is arranged on the top end of the rotary disc seat (601), balls are inserted in the rotary seat (604), and seepage limiting plates (605) are fixedly connected to the top ends of the rotary seat (604) and the reset telescopic spring (603).

4. A pressure reducing and regulating valve with a flow limiting and buffering function according to claim 3, wherein: the outer surface of seepage limiting plate (605) has seted up seepage hole groove (602), and seepage limiting plate (605) all one-to-one with seepage hole groove (602) size position of seting up on rotating disk seat (601), flexible spring (603) resets through screw fixed mounting on the top lateral wall of the bottom of seepage limiting plate (605) and rotating disk seat (601), seepage limiting plate (605) rotate on rotating disk seat (601) through rotating seat (604) and be connected, seepage limiting plate (605) rotate with the elasticity of flexible spring (603) that resets and be connected.

5. The pressure reducing and regulating valve with flow limiting and buffering functions according to claim 1, wherein: the pressure release mechanism (7) comprises a guide plate (701), a pressure release expansion plate (702) and a connecting seat (703), wherein the guide plate (701) is arranged on the inner side wall of the flow limiting mechanism (2), the pressure release expansion plate (702) is inserted into the guide plate (701), the connecting seat (703) is fixedly connected to the top end of the pressure release expansion plate (702), and a second pressure reduction spring (704) is sleeved outside the connecting seat (703).

6. The pressure reducing and regulating valve with flow limiting and buffering functions according to claim 5, wherein: the pressure relief expansion plate (702) is connected to the outside of the second pressure relief spring (704) through the connecting seat (703), the pressure relief expansion plate (702) is elastically connected with the second pressure relief spring (704) in a telescopic manner, and the inner side of the pressure relief expansion plate (702) is communicated with the second convection channel (204).

7. The pressure reducing and regulating valve with flow limiting and buffering functions according to claim 1, wherein: the guide mechanism (8) comprises a worm guide wheel (801), a rotary bearing seat (802) and a second worm wheel (803), wherein the worm guide wheel (801) is fixedly connected to the bottom end of the first worm (505), the bottom end of the worm guide wheel (801) is connected with the rotary bearing seat (802), and the second worm wheel (803) is meshed with the outer surface of the worm guide wheel (801).

8. The pressure reducing and regulating valve with flow limiting and buffering functions according to claim 7, wherein: the second worm wheel (803) is sleeved outside the connecting guide rod (506), two second worm wheels (803) are sleeved on two sides of the outer portion of the connecting guide rod (506), and the worm guide wheels (801) are rotatably connected inside the rotating bearing seat (802).

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