Multi-stage pressure regulating and reducing valve with flow diversion function and working method thereof

Abstract

The present invention discloses a multi-stage pressure regulating and reducing valve with a diversion function and a working method thereof. The pressure reducing valve realizes precise control of the pressure reducing process by designing a multi-stage pressure regulating structure. At the same time, a diversion mechanism is provided to quickly implement pressure reduction when the liquid pressure is out of control, thereby realizing double protection for the pipeline. The pressure reducing valve mainly comprises a pressure reducing valve assembly, a pressure regulating mechanism, a pressure bearing sealing mechanism, a buffer mechanism, a buffer regulating mechanism and a diversion mechanism. The pressure regulating mechanism is installed on the top of the valve body and is used to adjust the pressure bearing strength of the pressure bearing sealing mechanism; the pressure bearing sealing mechanism is used to cooperate in adjusting and maintaining the liquid pressure; the buffer mechanism takes effect during the pressure reducing process, delays the valve closing speed by increasing the resistance, and reduces the water hammer effect; the buffer regulating mechanism is used to accurately adjust the buffer pressure of the buffer mechanism. When the pressure of the water inlet pipeline is too high, the diversion mechanism can quickly divert and reduce the pressure. The various mechanisms cooperate to form a multi-stage pressure regulating and reducing system.

Description

Technical Field

[0001] The present invention relates to a pressure reducing valve, and in particular to a multi-stage pressure regulating pressure reducing valve with a flow diversion function, which belongs to the field of pressure reducing valves in fluid control technology. The pressure reducing valve can realize multi-stage regulation and control of pressure bearing strength and buffering effect, and in the event of liquid pressure out of control, the pressure of the pipeline system can be quickly reduced by using the provided flow diversion function, and the pipeline can be protected at multiple levels, thereby avoiding accidents such as pipeline rupture.

[0002] Most of the common pressure reducing valves currently use a single pressure reducing structure, and can only be opened to release pressure at a set pressure value. When the system pressure is rapidly out of control or fluctuates, the response speed of this type of pressure reducing valve is slow and cannot be adjusted quickly, which easily leads to pipeline fatigue damage and water hammer problems. The pressure reducing valve provided by the present invention can expand the pressure range of pressure reduction regulation and optimize the pressure reduction effect through the design of multi-stage pressure regulation and pressure reduction, and use the diversion function to achieve rapid pressure reduction, thereby enhancing the protection of the pipeline. Background Art

[0003] A pressure reducing valve is a valve used to control fluid pressure. It protects pipelines, equipment or systems from excessive pressure by automatically adjusting and maintaining fluid pressure within a set range. Its working principle is to adjust the valve opening by sensing changes in fluid pressure, thereby achieving control of fluid pressure. When the fluid pressure exceeds the set pressure value, the pressure reducing valve will open, allowing part of the fluid to pass through, thereby reducing the pressure to within the set range; when the fluid pressure is lower than the set value, the pressure reducing valve will close, preventing the fluid from continuing to discharge, thereby increasing the pressure.

[0004] Chinese invention patent application: CN116734021A discloses a pressure reducing valve, which belongs to the field of valve manufacturing technology. It solves the problems of existing pressure reducing valves without filtration. The pressure reducing valve includes a valve body, a valve cover, a mounting seat and a valve stem. The top of the valve stem contacts the bottom surface of the diaphragm. A screw one passes through the support plate, the diaphragm and is threadedly connected to the valve stem. The bottom end of the valve stem extending out of the mounting seat is threadedly connected with screw two, and a sealing gasket for sealing the mounting seat is fixedly connected between screw two and the bottom end of the valve stem. A filter screen is provided between the water inlet and the water outlet. The mounting seat has a through hole connected to the water storage chamber. The valve body has a guide hole connected to the water outlet and the through hole. A number of screws three evenly distributed circumferentially pass through the valve cover, the diaphragm and are threadedly connected to the valve body. The pressure reducing valve has a filtering function and can ensure the pressure accuracy of the water outlet, and has good working stability;

[0005] However, although the pressure reducing valve has a filtering function and can ensure the accuracy of the outlet pressure, its pressure reducing method is the same as that of the traditional pressure reducing valve, which is driven by a single spring. As a result, when the pressure reducing valve is closed, the flow velocity and kinetic energy of the fluid in the pipeline will decrease rapidly, causing the fluid to decelerate sharply and increase pressure in the pipeline, which is very likely to cause a water hammer effect. For this reason, a pressure reducing valve is proposed. Summary of the invention

[0006] In view of this, the present invention provides a multi-stage pressure regulating and reducing valve with a diversion function to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial choice.

[0007] The technical solution of the embodiment of the present invention is implemented as follows: a multi-stage pressure-regulating and reducing valve with a flow-dividing function, comprising a pressure-reducing valve assembly and a pressure-regulating mechanism, wherein the pressure-reducing valve assembly comprises a valve body, a water inlet connecting pipe, a water discharge connecting pipe and two water collecting chambers; the pressure-regulating mechanism is installed on the top of the inner side wall of the valve body; a buffer mechanism is installed on the bottom of the inner side wall of the valve body, and a buffer adjustment mechanism is installed between the buffer mechanism and the valve body; a flow-dividing mechanism is installed on one side of the valve body;

[0008] Wherein, the pressure regulating mechanism is used to adjust the pressure bearing strength of the pressure bearing sealing mechanism;

[0009] Wherein, the pressure-bearing sealing mechanism is used to match, adjust and maintain the fluid pressure;

[0010] The buffer mechanism is used to increase the resistance of the pressure-bearing sealing mechanism when it descends by means of buffering, so as to delay the speed of the pressure reducing valve when it closes;

[0011] Wherein, the buffer adjustment mechanism is used to adjust the pressure of the buffer mechanism acting on the pressure-bearing sealing mechanism;

[0012] The diversion mechanism is used to monitor the pressure in the water inlet connecting pipe and quickly reduce the pressure in the water inlet connecting pipe by diversion.

[0013] Further preferably, the pressure regulating mechanism comprises a first threaded knob, a slide plate, a first spring and a support plate;

[0014] Among them, the outer wall of the slide plate is slidably connected to the top of the inner wall of the valve body, the inner wall of the slide plate is threadedly connected to the bottom of the outer wall of the first threaded knob, one end of the first spring is fixedly connected to the bottom of the slide plate, the other end of the first spring is fixedly connected to the top of the support plate, and the outer wall of the support plate is slidably connected to the inner wall of the valve body.

[0015] Further preferably, the pressure-bearing sealing mechanism comprises a pressure-bearing pad, two sealing connecting pipes and two sealing plugs;

[0016] Among them, the pressure pad is fixedly connected to the bottom of the support plate, the two sealing connecting pipes are respectively connected to the tops of the two water collecting chambers, the two sealing plugs are fixedly connected to the bottom of the pressure pad, and the outer walls of the two sealing plugs are respectively slidably connected to the inner walls of the two sealing connecting pipes.

[0017] Further preferably, the buffer mechanism includes a buffer plate, a second spring and a slider;

[0018] Wherein, the buffer plate and the slider are both slidably connected between the two water collecting chambers, one end of the second spring is fixedly connected to the bottom of the buffer plate, and the other end of the second spring is fixedly connected to the top of the slider.

[0019] Further preferably, a guide rod is evenly and fixedly connected to the bottom of the inner side wall of the valve body, and the inner side wall of the sliding block is slidably connected to the outer side wall of the guide rod.

[0020] Further preferably, the buffer adjustment mechanism includes a second knob and a scale marking portion;

[0021] The outer wall of the second knob is rotatably connected to the bottom of the inner wall of the valve body through a bearing, the outer wall of the second knob is threadedly connected to the inner wall of the slider, and the scale marking part is arranged at the bottom of the valve body.

[0022] Further preferably, the diversion mechanism includes a solenoid valve, a pressure sensor and two diversion pipes;

[0023] Among them, the pressure sensor is connected to one end of the solenoid valve, the other end of the pressure sensor is connected to the outer wall of the water inlet connecting pipe through a diverter pipe, and the other end of the solenoid valve is connected to the outer wall of the drain connecting pipe through another diverter pipe.

[0024] Further preferably, an electric control box is fixedly connected to the top of the outer side wall of the solenoid valve, a controller is installed on one side of the inner side wall of the electric control box, and relays are evenly installed on the other side of the inner side wall of the electric control box.

[0025] Further preferably, the signal output end of the pressure sensor is electrically connected to the signal input end of the controller through a wire, the electrical output end of the controller is electrically connected to the electrical input end of the relay through a wire, and the electrical output end of the relay is electrically connected to the electrical input end of the solenoid valve through a wire.

[0026] Further preferably, the top of the valve body is threadedly connected to an end cover via a bolt, a sealing gasket is provided between the end cover and the valve body, and the outer side wall of the first threaded knob is rotatably connected to the inner side wall of the end cover via a bearing.

[0027] The present invention also provides a working method of a multi-stage pressure regulating and reducing valve with a flow dividing function, comprising the following steps:

[0028] (1) The first threaded knob is rotated to drive the slide plate to move by the thread, the moving slide plate drives the support plate to move by the first spring, and the moving support plate drives the pressure pad to move, so as to adjust the insertion depth of the sealing plug, and control the pressure strength of the pressure pad by the compressed first spring;

[0029] (2) The slider is driven to move by turning the second knob, thereby driving the second spring to be compressed, so as to fine-tune the pressure between the buffer plate and the pressure pad according to actual needs;

[0030] (3) When the pressure in the water inlet connecting pipe decreases, the compressed first spring is used to drive the support plate to move, and the moving support plate drives the pressure-bearing pad to first contact the buffer plate, so that the pressure-bearing pad squeezes the buffer plate to drive the second spring to compress, so that the compressed second spring provides a buffer for the moving pressure-bearing pad, increases the resistance of the pressure-bearing pad during movement, and is used to delay the closing speed of the pressure reducing valve;

[0031] (4) When the pressure in the water inlet connecting pipe detected by the pressure sensor exceeds the set threshold, the controller uses the relay to start the solenoid valve, and the working solenoid valve connects the two shunt pipes to quickly reduce the pressure in the water inlet connecting pipe.

[0032] The embodiment of the present invention has the following advantages due to the adoption of the above technical solution:

[0033] 1. The present invention utilizes the pressure in the water collecting chamber to push the pressure-bearing sealing mechanism to drive the pressure regulating mechanism to move, so as to connect the two water collecting chambers. When the pressure reducing valve is closed, the pressure regulating mechanism drives the pressure-bearing sealing mechanism to contact the buffer mechanism first, so that the buffer mechanism can reduce the descending speed of the pressure-bearing sealing mechanism by buffering, so as to delay the closing speed of the pressure reducing valve, thereby reducing the impact on the flow rate and kinetic energy of the fluid in the pipeline, and avoiding the water hammer effect caused by the closing of the pressure reducing valve.

[0034] 2. The present invention monitors the pressure data of the fluid in the water inlet connecting pipe by utilizing a diverter mechanism. When the pressure in the pipeline is out of control, causing the pressure in the water inlet connecting pipe to rise sharply, the fluid in the water inlet connecting pipe is separated by the diverter mechanism, so as to quickly reduce the pressure in the water inlet connecting pipe by balancing the pressure difference between the water inlet connecting pipe and the drainage connecting pipe, thereby reducing the impact caused by the pressure out of control and increasing the protection of the pipeline.

[0035] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural diagram of the present invention;

[0038] Figure 2 It is a schematic cross-sectional structure diagram of the present invention from a first viewing angle;

[0039] Figure 3 is a schematic cross-sectional structural diagram of the present invention from a second viewing angle;

[0040] Figure 4 It is a schematic cross-sectional view of the electric control box of the present invention;

[0041] Figure 5 It is a bottom view structural schematic diagram of the present invention;

[0042] Figure 6 For the present invention Figure 5 A-region structure enlargement.

[0043] 1. Pressure reducing valve assembly; 2. Pressure regulating mechanism; 3. Pressure-bearing sealing mechanism; 4. Buffer mechanism; 5. Buffer adjusting mechanism; 6. Diverter mechanism; 101. Valve body; 102. Water inlet connecting pipe; 103. Water discharge connecting pipe; 104. Water collecting chamber; 201. First threaded knob; 202. Slide plate; 203. First spring; 204. Support plate; 301. Pressure-bearing pad; 302. Sealing connecting pipe; 303. Sealing plug; 401. Buffer plate; 402. Second spring; 403. Slider; 501. Second knob; 502. Scale marking part; 601. Solenoid valve; 602. Pressure sensor; 603. Diverter; 71. Guide rod; 72. Electric control box; 73. Controller; 74. Relay; 75. End cover; 76. Sealing pad. DETAILED DESCRIPTION

[0044] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0045] It should be noted that the terms "first", "second", "symmetrical", "array", etc. are only used to distinguish between description and position description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the definition of "first", "symmetrical", etc. can explicitly or implicitly include one or more of these features; similarly, when the number of certain features is not limited in the form of words such as "two" or "three", it should be noted that this feature also explicitly or implicitly includes one or more feature quantities.

[0046] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0047] like Figure 1-6 As shown, an embodiment of the present invention provides a pressure reducing valve, including a pressure reducing valve assembly 1 and a pressure regulating mechanism 2, wherein the pressure reducing valve assembly 1 includes a valve body 101, a water inlet connecting pipe 102, a water discharge connecting pipe 103 and two water collecting chambers 104;

[0048] Among them, two water collecting chambers 104 are symmetrically arranged inside the valve body 101, the water inlet connecting pipe 102 is connected to one side of the valve body 101 and is connected to one water collecting chamber 104, the drainage connecting pipe 103 is connected to the other side of the valve body 101 and is connected to the other water collecting chamber 104, the pressure regulating mechanism 2 is installed on the top of the inner wall of the valve body 101, the pressure regulating mechanism 2 is installed with a pressure-bearing sealing mechanism 3 between the water collecting chambers 104, the buffer mechanism 4 is installed at the bottom of the inner wall of the valve body 101, the buffer mechanism 4 is installed with a buffer adjustment mechanism 5 between the valve body 101, and a diversion mechanism 6 is installed on one side of the valve body 101;

[0049] The pressure regulating mechanism 2 is used to adjust the pressure-bearing strength of the pressure-bearing sealing mechanism 3; more specifically, it can be installed on the top of the valve body 101 in a threaded connection manner, and the position of the mechanism can be raised or lowered by rotating the thread, thereby changing the pressure-bearing area and pressure-bearing strength of the pressure-bearing sealing mechanism 3. It can also be designed as a pneumatic or hydraulic piston structure, and the pressure-bearing strength can be changed by adjusting the air supply or liquid supply pressure.

[0050] The pressure-bearing sealing mechanism 3 is used to match, adjust and maintain the fluid pressure; more specifically, it can be made of elastic materials such as soft sealing rings and rubber diaphragms to produce a seal with the valve seat. It can also be a sealing structure between a metal ring and a metal valve disc. The hardness and elastic coefficient of the material will affect the fluid pressure and sealing performance.

[0051] The buffer mechanism 4 is used to increase the resistance of the pressure-bearing sealing mechanism 3 when it descends by means of buffering, so as to delay the speed of the pressure reducing valve when it closes;

[0052] The buffer adjustment mechanism 5 is used to adjust the pressure of the buffer mechanism 4 on the pressure-bearing sealing mechanism 3;

[0053] The diversion mechanism 6 is used to monitor the pressure in the water inlet connecting pipe 102 and quickly reduce the pressure in the water inlet connecting pipe 102 by diversion.

[0054] In one embodiment, the pressure regulating mechanism 2 includes a first threaded knob 201, a slide plate 202, a first spring 203 and a support plate 204;

[0055] Among them, the outer wall of the slide plate 202 is slidably connected to the top of the inner wall of the valve body 101, the inner wall of the slide plate 202 is threadedly connected to the bottom of the outer wall of the first threaded knob 201, one end of the first spring 203 is fixedly connected to the bottom of the slide plate 202, the other end of the first spring 203 is fixedly connected to the top of the support plate 204, and the outer wall of the support plate 204 is slidably connected to the inner wall of the valve body 101.

[0056] The first threaded knob 201 drives the slide plate 202 to move by means of the thread, the moving slide plate 202 drives the support plate 204 to move by means of the first spring 203, and the moving support plate 204 drives the pressure pad 301 to move.

[0057] In one embodiment, the pressure-bearing sealing mechanism 3 includes a pressure-bearing pad 301, two sealing connecting pipes 302 and two sealing plugs 303;

[0058] Among them, the pressure pad 301 is fixedly connected to the bottom of the support plate 204, the two sealing connecting tubes 302 are respectively connected to the tops of the two water collecting chambers 104, and the two sealing plugs 303 are fixedly connected to the bottom of the pressure pad 301, and the outer walls of the two sealing plugs 303 are respectively slidably connected to the inner walls of the two sealing connecting tubes 302.

[0059] The fluid is introduced into a water collecting chamber 104 through the water inlet connecting pipe 102, and then the fluid pressure is used to push the sealing plug 303 to slide in the sealing connecting pipe 302, so that the moving sealing plug 303 can drive the pressure pad 301 to move, and the moving pressure pad 301 drives another sealing plug 303 to slide from another sealing connecting pipe 302, and drives the first spring 203 to be compressed through the support plate 204.

[0060] In one embodiment, the buffer mechanism 4 includes a buffer plate 401, a second spring 402 and a slider 403;

[0061] Among them, the buffer plate 401 and the slider 403 are both slidably connected between the two water collecting chambers 104, one end of the second spring 402 is fixedly connected to the bottom of the buffer plate 401, and the other end of the second spring 402 is fixedly connected to the top of the slider 403, and the bottom of the inner wall of the valve body 101 is evenly fixedly connected with the guide rod 71, and the inner wall of the slider 403 is slidably connected to the outer wall of the guide rod 71.

[0062] The buffer adjustment mechanism 5 includes a second knob 501 and a scale marking portion 502;

[0063] The outer wall of the second knob 501 is rotatably connected to the bottom of the inner wall of the valve body 101 through a bearing, the outer wall of the second knob 501 is threadedly connected to the inner wall of the slider 403 , and the scale marking part 502 is arranged at the bottom of the valve body 101 .

[0064] The second knob 501 is rotated to drive the slider 403 to move and the second spring 402 to be compressed, so that the pressure between the buffer plate 401 and the pressure pad 301 can be fine-tuned according to actual needs. The scale marking part 502 is set so that the staff can judge the rotation range of the second knob 501 by observing the scale.

[0065] In one embodiment, the flow dividing mechanism 6 includes a solenoid valve 601, a pressure sensor 602 and two flow dividing pipes 603;

[0066] Among them, the pressure sensor 602 is connected to one end of the solenoid valve 601, and the other end of the pressure sensor 602 is connected to the outer wall of the water inlet connecting pipe 102 through a shunt pipe 603, and the other end of the solenoid valve 601 is connected to the outer wall of the drainage connecting pipe 103 through another shunt pipe 603. The top of the outer wall of the solenoid valve 601 is fixedly connected with an electric control box 72, a controller 73 is installed on one side of the inner wall of the electric control box 72, and relays 74 are evenly installed on the other side of the inner wall of the electric control box 72. The signal output end of the pressure sensor 602 is electrically connected to the signal input end of the controller 73 through a wire, the electrical output end of the controller 73 is electrically connected to the electrical input end of the relay 74 through a wire, and the electrical output end of the relay 74 is electrically connected to the electrical input end of the solenoid valve 601 through a wire.

[0067] The water pressure in the water inlet connecting pipe 102 is detected by the pressure sensor 602 using the shunt pipe 603, the data detected by the pressure sensor 602 is received by the controller 73, and the opening and closing of the solenoid valve 601 is controlled by the controller 73 using the relay 74.

[0068] In one embodiment, the top of the valve body 101 is threadedly connected to an end cover 75 via bolts, a sealing gasket 76 is provided between the end cover 75 and the valve body 101, and the outer wall of the first threaded knob 201 is rotatably connected to the inner wall of the end cover 75 via a bearing.

[0069] The sealing between the end cover 75 and the valve body 101 is ensured by using the sealing gasket 76 .

[0070] In one embodiment, the model of the pressure sensor 602 is SY803-G1DS3B2D; the model of the controller 73 is GPU221-ETH.

[0071] When the present invention is working: by rotating the first threaded knob 201, the slide plate 202 is driven to move by the thread, the moving slide plate 202 drives the support plate 204 to move by the first spring 203, and the moving support plate 204 drives the pressure pad 301 and the sealing plug 303 to move, so as to adjust the insertion depth of the sealing plug 303 into the sealing connecting pipe 302, and control the pressure strength of the pressure pad 301 by the compressed first spring 203, so that the fluid pressure is maintained within the set range.

[0072] When the first threaded knob 201 is adjusted, the slider 403 is moved by rotating the second knob 501, and the second spring 402 is compressed, so that the pressure between the buffer plate 401 and the pressure pad 301 can be fine-tuned according to actual needs, and the adjustment accuracy can be controlled by setting the scale marking part 502.

[0073] When the adjustment is completed, the fluid is introduced into a water collecting chamber 104 through the water inlet connecting pipe 102, and then the fluid pressure is used to push the sealing plug 303 to slide in the sealing connecting pipe 302, so that the moving sealing plug 303 can drive the pressure pad 301 to move, and the moving pressure pad 301 drives another sealing plug 303 to slide from another sealing connecting pipe 302, and drives the first spring 203 to be compressed through the support plate 204, so as to connect the two water collecting chambers 104.

[0074] When the pressure in the water inlet connecting pipe 102 decreases or the first threaded knob 201 is quickly turned again to adjust the position of the slide plate 202, the compressed first spring 203 is used to drive the support plate 204 to move. The moving support plate 204 drives the pressure pad 301 to first contact the buffer plate 401, so that the pressure pad 301 is used to squeeze the buffer plate 401 to drive the second spring 402 to be compressed, so that the compressed second spring 402 provides a buffer for the moving pressure pad 301, increases the resistance of the pressure pad 301 during movement, and is used to slow down the speed at which the pressure reducing valve is closed, thereby reducing the impact on the flow rate and kinetic energy of the fluid in the pipeline.

[0075] The water pressure in the water inlet connecting pipe 102 is detected by using the bypass pipe 603 through the set pressure sensor 602, and then the data detected by the pressure sensor 602 is received by the controller 73. When the data detected by the pressure sensor 602 reaches the threshold, the solenoid valve 601 is started by using the relay 74 through the controller 73. The working solenoid valve 601 connects the two bypass pipes 603 so that the fluid in the water inlet connecting pipe 102 can be directly introduced into the drainage connecting pipe 103 through the solenoid valve 601, the pressure sensor 602 and the bypass pipe 603. When the pressure in the pipeline is out of control, causing the pressure in the water inlet connecting pipe 102 to rise sharply, the pressure in the water inlet connecting pipe 102 can be quickly reduced by balancing the pressure difference between the water inlet connecting pipe 102 and the drainage connecting pipe 103, thereby reducing the impact caused by the pressure loss and increasing the protection of the pipeline.

[0076] When the data detected by the pressure sensor 602 is lower than the threshold value, the controller 73 uses the relay 74 to close the solenoid valve 601, so that the pressure reducing valve resumes normal operation.

[0077] Another specific embodiment:

[0078] The pressure reducing valve of this embodiment is set in a water supply pipeline system with a diameter of 80mm, and the pipeline water pressure design value is 0.45MPa. The main structural parameters of the pressure reducing valve are as follows:

[0079] 1. Valve body 101 is made of Q235B steel, with an inner diameter of 120mm and a height of 300mm.

[0080] 2. The end cover 75 is made of 40Cr steel with a thickness of 20mm. The sealing gasket 76 between the end cover 75 and the valve body 101 is sealed with a 4mm thick graphiglas 3000 gasket;

[0081] 3. The diameter of the water inlet connecting pipe 102 and the drainage connecting pipe 103 are both 80mm, and they are made of 20CrMo alloy steel;

[0082] 4. The volume of the two water collecting chambers 104 is 2L;

[0083] 5. The first spring 203 is a helical cylindrical compression spring made of metal, with a spring constant k=5N / mm;

[0084] 6. The second spring 402 is a spiral conical compression spring made of elastic alloy, with a spring constant k=3N / mm;

[0085] 7. The pressure sensor 602 model is PI280 from IFM of Germany, with a measuring range of 0~1MPa and an accuracy of ±0.5%;

[0086] 8. The model of solenoid valve 601 is HD125 of Shanghai Hande Valve Co., Ltd., with a rated pressure of 1.6MPa;

[0087] 9. The controller 73 model is Siemens CPU226 with Profinet communication interface;

[0088] After the pressure reducing valve of this embodiment is assembled according to the above structure, the pressure bearing strength of the pressure-bearing sealing mechanism 3 is set to achieve good sealing for a pressure of 0.5 MPa by adjusting the first threaded knob 201, and the buffering effect of the buffer mechanism 4 is set to start when the pressure drops to 0.3 MPa by adjusting the second knob 501; the pressure threshold of the pressure sensor 602 is programmed to 0.8 MPa through the controller 73, and the diversion mechanism 6 is triggered to work when this value is exceeded.

[0089] In this way, when the pipeline is supplying water normally, the water pressure is controlled at 0.45MPa, and the pressure reducing valve remains sealed; when the pipeline water pressure is too high or water hammer occurs, and the pressure exceeds 0.5Mpa, the pressure reducing valve opens to release pressure and drain water; if the pressure drops rapidly, the buffer mechanism starts to take effect at 0.3MPa, slowing down the valve closing speed and avoiding water hammer; if the pressure is out of control and exceeds 0.8MPa, the diversion mechanism immediately acts to reduce the pressure. This achieves multi-level protection for the pipeline system.

[0090] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-stage pressure regulating and reducing valve with diversion function for a liquid pipeline system, wherein the liquid is water, characterized in that: The invention comprises a pressure reducing valve assembly (1) and a pressure regulating mechanism (2), wherein the pressure reducing valve assembly (1) comprises a valve body (101), a water inlet connecting pipe (102), a water discharge connecting pipe (103) and two water collecting chambers (104); one of the water collecting chambers (104) is connected to the water inlet connecting pipe (102), and the other of the water collecting chambers (104) is connected to the water discharge connecting pipe (103); the two water collecting chambers constitute an independent pressure control space for realizing bidirectional pressure protection; The pressure regulating mechanism (2) is installed on the top of the inner wall of the valve body (101), and the pressure regulating mechanism (2) comprises a first threaded knob (201), a slide plate (202), a first spring (203) and a support plate (204); the outer wall of the slide plate (202) is slidably connected to the top of the inner wall of the valve body (101), and the inner wall of the slide plate (202) is threadedly connected to the bottom of the outer wall of the first threaded knob (201); the pressure regulating mechanism (2) is provided with a pressure-bearing sealing mechanism (3) between the water collecting chamber (104), and the pressure-bearing sealing mechanism (3) comprises a pressure-bearing sealing mechanism (3) and a pressure-bearing sealing mechanism (3). A pressure pad (301), two sealing connection pipes (302) and two sealing plugs (303), wherein the pressure pad (301) is fixedly connected to the bottom of the support plate (204), and the two sealing plugs (303) are respectively slidably sealed in the two sealing connection pipes (302) to control the connection state between the two water collecting chambers (104); the cooperation between the pressure pad and the two sealing plugs allows the water flow at the water outlet to flow back to the water inlet through the two water collecting chambers to form a pressure buffer when the water inlet loses pressure, and allows the water flow at the water inlet to flow to the water outlet through the two water collecting chambers to form a pressure buffer when the valve is closed; A buffer mechanism (4) is installed at the bottom of the inner wall of the valve body (101), and the buffer mechanism (4) comprises a buffer plate (401), a second spring (402) and a slider (403). The buffer plate (401) and the slider (403) are both slidably connected between the two water collecting chambers (104), one end of the second spring (402) is fixedly connected to the bottom of the buffer plate (401), and the other end of the second spring (402) is fixedly connected to the top of the slider (403); the buffer mechanism, through the cooperation between the buffer plate and the second spring, forms an antagonism between the antagonism force generated by the water pressure acting on the sealing plug and the preset thrust of the buffer plate during the valve closing process, and the closing stroke is not performed until the spring compression force exceeds the water pressure force and the buffer thrust; A flow diversion mechanism (6) is installed on one side of the valve body (101); when the pressure exceeds a preset threshold, the pipeline pressure is quickly reduced by diversion; The pressure regulating mechanism (2) regulates and controls the pressure-bearing strength of the pressure-bearing pad (301) through the first spring (203); the pressure-bearing pad (301) first contacts the buffer plate (401) under the action of pressure; the buffer mechanism (4) is used to increase the resistance of the pressure-bearing sealing mechanism (3) when it descends by means of buffering, so as to delay the closing speed of the pressure reducing valve; the buffer regulating mechanism (5) is used to regulate the pressure of the buffer mechanism (4) acting on the pressure-bearing sealing mechanism (3); The diversion mechanism (6) is used to monitor the pressure in the water inlet connecting pipe (102) and quickly reduce the pressure in the water inlet connecting pipe (102) by diversion; The flow diversion mechanism (6) comprises a solenoid valve (601), a pressure sensor (602) and two flow diversion pipes (603); wherein the pressure sensor (602) is connected to one end of the solenoid valve (601), the other end of the pressure sensor (602) is connected to the outer wall of the water inlet connecting pipe (102) through a flow diversion pipe (603), the other end of the solenoid valve (601) is connected to the outer wall of the water discharge connecting pipe (103) through another flow diversion pipe (603), the top of the outer wall of the solenoid valve (601) is fixedly connected to an electric control box (72), one side of the inner wall of the electric control box (72) is installed with a controller (73), and the other side of the inner wall of the electric control box (72) is evenly installed with relays (74); The signal output end of the pressure sensor (602) is electrically connected to the signal input end of the controller (73) through a wire, the electrical output end of the controller (73) is electrically connected to the electrical input end of the relay (74) through a wire, and the electrical output end of the relay (74) is electrically connected to the electrical input end of the solenoid valve (601) through a wire.

2. The multi-stage pressure regulating and reducing valve with flow diversion function for a liquid pipeline system according to claim 1, characterized in that: The top of the valve body (101) is threadedly connected to an end cover (75) via bolts, and a sealing gasket (76) is provided between the end cover (75) and the valve body (101).

3. A method for operating a multi-stage pressure regulating and reducing valve with flow diversion function for a liquid pipeline system using any one of claims 1 to 2, characterized in that: The following steps are involved: (1) The first threaded knob (201) is rotated to drive the slide plate (202) to move by means of the thread, the moving slide plate (202) drives the support plate (204) to move by means of the first spring (203), and the moving support plate (204) drives the pressure pad (301) to move, so as to adjust the insertion depth of the sealing plug (303), and control the pressure strength of the pressure pad (301) by means of the compressed first spring (203), so as to maintain the fluid pressure within a set range; (2) The second knob (501) is rotated to drive the slider (403) to move, thereby driving the second spring (402) to be compressed, so as to fine-tune the pressure between the buffer plate (401) and the pressure pad (301) according to actual needs; (3) When the pressure in the water inlet connecting pipe (102) decreases, a fluid is introduced into a water collecting chamber (104) through the water inlet connecting pipe (102), and the sealing plug (303) is pushed to slide in the sealing connecting pipe (302) by utilizing the fluid pressure. The moving sealing plug (303) drives the pressure-bearing pad (301) to move, and the moving pressure-bearing pad (301) drives another sealing plug (303) to slide from another sealing connecting pipe (302), and drives the first spring (203) to be compressed through the support plate (204), so that the space between the two water collecting chambers (104) is The compressed first spring (203) is used to drive the support plate (204) to move, and the moving support plate (204) drives the pressure pad (301) to first contact the buffer plate (401), so that the pressure pad (301) is used to squeeze the buffer plate (401) to drive the second spring (402) to be compressed, so that the compressed second spring (402) provides buffering for the moving pressure pad (301), increases the resistance of the pressure pad (301) during movement, and is used to delay the speed of the pressure reducing valve when closing, thereby reducing the impact on the flow rate and kinetic energy of the fluid in the pipeline; (4) The water pressure in the water inlet connecting pipe (102) is detected by using the shunt pipe (603) through the pressure sensor (602); when the pressure in the water inlet connecting pipe (102) detected by the pressure sensor (602) exceeds a set threshold, the controller (73) uses the relay (74) to start the solenoid valve (601) to work, and the working solenoid valve (601) connects the two shunt pipes (603) to quickly reduce the pressure in the water inlet connecting pipe (102) by balancing the pressure difference between the water inlet connecting pipe (102) and the water discharge connecting pipe (103); when the data detected by the pressure sensor (602) is lower than the set threshold, the controller (73) uses the relay (74) to close the solenoid valve (601) so that the pressure reducing valve resumes normal operation.

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